Entries |
Document | Title | Date |
20080236322 | Transmission range shift control with neutral position lock - A range selection control system for a transmission facilitates safe operation of a power take off. A fluid actuated range piston assembly within a range cylinder moves between low range and high range positions. Range cylinder and range piston assembly define sealed high range and low range chambers. A neutral cylinder intersects range cylinder. A fluid actuated neutral piston assembly within neutral cylinder defines a neutral chamber. Neutral piston assembly engages range control piston assembly responsive to pressurization of neutral chamber. Neutral piston assembly is received by an engagement feature of range piston assembly when range control piston assembly is in a neutral position, retaining range piston assembly there. An electrically responsive locking mechanism locks neutral piston assembly in place when range piston assembly is in the neutral position. The locking is controlled by a condition of an electrical switch indicating a transmission condition. | 10-02-2008 |
20090151495 | ELECTRO-HYDRAULIC CONTROL APPARATUS FOR A MOTOR-VEHICLE TRANSMISSION WITH AT LEAST FIVE FORWARD GEARS AND ONE REVERSE GEAR - The control apparatus comprises, in its version intended for a double-clutch transmission with six or seven forward gears and one reverse gear, a first shift fork for engaging the first gear or the third gear, respectively, a second shift fork for engaging the reverse gear or the fifth gear, respectively, a first hydraulic actuator arranged to control the movement of the first shift fork, a second hydraulic actuator arranged to control the movement of the second shift fork, a selection slide valve which can be moved into a first operating position in which the first hydraulic actuator is selected and a second operating position in which the second hydraulic actuator is selected, a pilot solenoid valve for controlling the movement of the slide valve between the first and second operating positions, and first and second gear shift solenoid valves for controlling the supply of fluid to the hydraulic actuator each time selected by the slide valve or the connection of said actuator with a tank. The slide valve is configured in such a manner that the first and second operating positions are end-of-travel positions, wherein the first operating position is a rest position, in which the pilot solenoid valve does not generate any hydraulic pilot control signal and the slide valve is held by resilient means against a first mechanical stop, and wherein the second operating position is a maximum-control position, in which the pilot solenoid valve generates a hydraulic control signal such that the slide valve is brought against a second mechanical stop opposite to the first one. | 06-18-2009 |
20090241714 | HYDRAULIC ACTUATOR FOR TRANSMISSIONS HAVING REDUCED NOISE - The present invention provides a three position hydraulic piston assembly for a gear ratio change mechanism for a transmission exhibiting reduced gear shift noise. The three position hydraulic piston assembly includes a master piston and motion retarding assemblies that act near both travel limits of the master piston. The master piston includes symmetrical passageways that provide hydraulic fluid flow to small chambers at each end of the piston that are closed off as the piston approaches its travel limits. Hydraulic fluid trapped in the chambers decelerates the piston and is bled off through an orifice allowing the piston to reach its travel limit and quickly and quietly engage a gear ratio. | 10-01-2009 |
20090249913 | HYDRAULIC CONTROL FOR A PARK BY WIRE SYSTEM USED IN A MULTIMODE HYBRID TRANSMISSION - A servo valve for shifting a transmission between a park and out of park position includes a valve housing and a park servo. A first and second solenoid is disposed in the valve housing for transmitting a respective first or second signal to shift the transmission to the respective first or second state of operation. The park servo is fluidly connected to the transmission and is responsive to the first and second signals to shift the transmission to the respective positions. Fluid pressure within the valve housing moves a valve member therein to move a piston within the park servo to shift the transmission to the corresponding position. A third solenoid transmits a third signal in combination with the second signal to latch and hold the valve member in the corresponding position. | 10-08-2009 |
20090301248 | DEVICE FOR ACTUATING A GEARWHEEL, WHICH IS DESIGNED AS A LOOSE WHEEL, OF A TRANSMISSION DEVICE - A device for actuating a gearwheel of a transmission device. The gearwheel rotates on a shaft and can be shifted by way an engagement mechanism that includes at least one actuator that is arranged at least partially inside the shaft. The actuator can be actuated by a pressure medium to fix the gearwheel to the shaft. The actuation force required for engaging or disengaging the gearwheel can come from within the shaft. The actuator is a piston-cylinder unit which is either rotationally fixed to the shaft or rotationally fixed relative the shaft. When the actuator is rotationally fixed relative to the shaft, the active connection between the actuator and the gearwheel, which is to be shifted, includes a drive decoupling unit between the actuator and the shaft. | 12-10-2009 |
20090308193 | ACTUATING CYLINDER FOR VEHICLE GEARBOXES - A vehicle transmission is proposed, whose housing ( | 12-17-2009 |
20100000360 | MANUAL TRANSMISSION WITH A GEARSHIFT LOCKING MECHANISM AND METHOD - A manual transmission with a gearshift locking arrangement includes a rail having a shifter having a slot between forward and rear ears of the shifter, the rail being movable between rail forward and rear positions. The manual transmission with a gearshift locking arrangement also includes forward and rear engagement members disposed at positions corresponding to the rail forward and rear positions. A shift lever is also provided, an engaging portion of the shift lever being adapted to be disposed in the slot, the shift lever being adapted to move the rail between the rail forward and rear position, the engaging portion being engageable with the forward engagement member when the rail is in the rail forward position and the engaging portion being engageable with the rear engagement member when the rail is in the rail rear position. | 01-07-2010 |
20100043585 | SHIFT OPERATING DEVICE FOR AUTOMATIC TRANSMISSION - The present invention provides a dial knob pivotably mounted and a hydraulic device for operating an inhibitor switch of an automatic transmission by creating hydraulic pressure using rotational motion of the dial knob, in order to provide a shift operating device for an automatic transmission that makes it possible to reduce manufacturing cost by having a simple structure and facilitate setting a layout by reducing a space for motion of shift knob, and makes it easy for a driver to shift by turning the shift knob with a hand to reduce the driver's tiredness and improve commercial value. | 02-25-2010 |
20100154576 | SHIFT ARRANGEMENT - A shift arrangement for shifting a transfer case in a main transmission for an all-wheel-drive vehicle, having at least one actuated shift device such that the shift device can be hydraulically actuated by at least one piston (1) which can move in a cylinder (2) between various shift positions (2WD/high, 4WD/high, 4WD/low). | 06-24-2010 |
20100175492 | POWER BOOSTING DEVICE - A servo-assistance mechanism ( | 07-15-2010 |
20100175493 | SHIFTING DEVICE FOR A VARIABLE SPEED MOTOR VEHICLE TRANSMISSION - A shifting device ( | 07-15-2010 |
20100186530 | SHIFT CONTROL DEVICE FOR AUTOMATIC TRANSMISSION - Lubricating oil passages extending toward a power transmission mechanism from a regulator valve to lubricate the power transmission mechanism include a first lubricating oil passage for supplying lubricating oil to a low clutch used to set up a low gear speed and a second lubricating oil passage for supplying lubricating oil with line pressure to the low clutch. A check valve for preventing the lubricating oil from flowing out from frictional engagement elements other than the low clutch when the second lubricating oil passage is selected, is provided on the first lubricating oil passage. An outflow preventing section for preventing the lubricating oil, supplied to the low clutch via the first lubricating oil passage, from flowing out from any open port of hydraulic control valves when the second lubricating oil passage is not selected, is provided on the second lubricating oil passage. | 07-29-2010 |
20100212447 | SHIFTING DEVICE FOR A VEHICLE TRANSMISSION - A shifting device is provided for a vehicle transmission with a selector lever pivotable within a shifting device housing about at least one axis of rotation for selecting gears defined within the vehicle transmission. A shift position of the selector lever is assigned to at least one gear. A locking device for the individual shift positions of the selector lever can be released as a function of given general data of the state of motor vehicle components such as the pedal mechanism and the engine. The locking device has a locking element displaceable by the selector lever analogously to the individual shift positions of the selector lever. The locking element has a plurality of locking devices, which correspond to the individual shift positions and which can be brought into a locking position and an unlocking position by at least one actuating device. | 08-26-2010 |
20100236348 | DRIVETRAIN DEVICE OF A VEHICLE | 09-23-2010 |
20100275714 | GEAR SHIFT CONTROL DEVICE FOR A VEHICLE GEARBOX WITH A ROTATING AND AXIALLY FLOATING DRUM - The control device comprises an electric motor, a reduction gear, a shaft operable by the electric motor via the reduction gear, and a drum mounted on the shaft so as to be connected for rotation therewith but free to slide axially relative thereto. The drum has on its cylindrical lateral surface a guide groove in which a plurality of studs are guided, each of the studs being drivingly connected for translation with a respective shift finger in such a manner that the rotary motion of the drum is converted into the translational motion of the shift fingers to control the engagement of the gears according to predetermined modes of operation. The control device further comprises a locking device arranged to lock the translational motion of the drum during the synchronization and gear engagement phases and to unlock the translational motion of the drum upon completion of the engagement of the gear. | 11-04-2010 |
20100294065 | TRANSMISSION OIL-PRESSURE CONTROL APPARATUS AND METHODS - A control apparatus of a vehicle transmission includes a hydraulic circuit configured to activate at least one friction element with a control pressure, a selector configured to select a range of the transmission, a valve configured to switch a transmission shifter, and a control unit configured to direct the valve to switch the transmission shifter in response to the selected transmission range and to reduce the control pressure prior to switching the transmission shifter. A method to control a vehicle transmission includes activating at least one friction element with a control pressure, selecting a desired range of the transmission, switching a transmission range in response to the selected desired transmission range, and reducing the control pressure prior to switching the transmission range. | 11-25-2010 |
20110023647 | Shifting device - In a parking position lock shifting device of a motor vehicle including an internal combustion engine, particularly a parking lock shifting device with at least one hydraulic shifting unit, the shifting unit is designed so as to be operable by a drive unit that is operable separately from the internal combustion engine. | 02-03-2011 |
20110030493 | DUAL CLUTCH TRANSMISSION HAVING SIMPLIFIED CONTROLS - A dual clutch transmission ( | 02-10-2011 |
20110056314 | HYDRAULIC CONTROL SYSTEMS FOR DUAL CLUTCH TRANSMISSIONS - The present invention comprehends a plurality of embodiments of a hydraulic control system for various configurations of dual clutch transmissions. The hydraulic control systems all include a regulated source of pressurized hydraulic fluid including an electric pump, a filter and an accumulator, a pair of pressure control valves and a branching hydraulic circuit including pressure or flow control valves, spool or logic valves and two position valves which collectively supply and exhaust hydraulic fluid from a plurality of shift actuators. The actuators are connected to shift rails which include shift forks and are slidable to engage synchronizers and positive clutches associated with the various gear ratios. | 03-10-2011 |
20110056315 | HYDRAULIC CONTROL SYSTEMS FOR DUAL CLUTCH TRANSMISSIONS - The present invention comprehends two embodiments of a hydraulic control system for a dual clutch transmission. The hydraulic control systems include a regulated source of pressurized hydraulic fluid including an electric pump, a filter and an accumulator, a pair of pressure control valves and a branching hydraulic circuit including pressure or flow control valves, spool or logic valves and two position valves which collectively supply and exhaust hydraulic fluid from a plurality of shift actuators. The actuators are connected to shift rails which include shift forks and are slidable to engage synchronizers and positive clutches associated with the various gear ratios. | 03-10-2011 |
20110056316 | HYDRAULIC CONTROL SYSTEMS FOR DUAL CLUTCH TRANSMISSIONS - The present invention comprehends a plurality of embodiments of a hydraulic control system for various configurations of dual clutch transmissions. The hydraulic control systems all include a regulated source of pressurized hydraulic fluid including an electric pump, a filter and an accumulator, a pair of pressure control valves and a branching hydraulic circuit including pressure or flow control valves, spool or logic valves and two position valves which collectively supply and exhaust hydraulic fluid from a plurality of shift actuators. The actuators are connected to shift rails which include shift forks and are slidable to engage synchronizers and positive clutches associated with the various gear ratios. | 03-10-2011 |
20110056317 | CONTROL SYSTEM FOR TRANSMISSION - In a twin-clutch transmission, when a third shift valve (for example) goes out of order and the shift change accordingly becomes incapable of being carried out, the hydraulic pressure outputted from the third shift valve is controlled by a fourth shift valve operated by a first shift solenoid for a first shift valve. Accordingly, the hydraulic pressure outputted by a second linear solenoid is supplied to one of second hydraulic actuators, thereby enabling one of second predetermined transmission gear stages to be pre-shifted by use of a second power transmission path. When the first shift valve is used as a fail-safe, it is possible for the vehicle to make a minimum necessary run by setting up one of the second predetermined transmission gear stages. Furthermore, the fourth shift valve is driven by use of the existing first shift solenoid, thus minimizing the number of parts and cost. | 03-10-2011 |
20110067516 | Control for an Automatic Transmission - A system for controlling a transmission includes a gear selector, a manual valve for connecting a pressure source alternately to Drive and Reverse lines in response to movement of the gear selector between selected Drive and Reverse positions, first and second solenoid-actuated valves, the first valve connecting the pressure source to a first control element, the second valve connecting the Reverse line to a second control element when the Reverse position is selected, a third solenoid-actuated valve connecting the Drive line to a third control element when the Drive position is selected, and a control valve through which pressure in the first control element is vented when the Drive position is selected. | 03-24-2011 |
20110083524 | HYDRAULIC PRESSURE CONTROL APPARATUS FOR AUTOMATIC TRANSMISSION - A hydraulic pressure control apparatus includes frictional engagement elements which include a multiple use frictional engagement element applied in common when a first speed stage of the D range, the R range, the P position, and the N range are selected, a first hydraulic pressure supply source for engaging the multiple use frictional engagement element, a second hydraulic pressure supply source for engaging the multiple use frictional engagement element, and a switching mechanism switching a first state where a pressure is supplied from the first hydraulic pressure supply source when the P position or the N range is selected and a second state where the engaging hydraulic pressure is supplied from the second hydraulic pressure supply when the D range or the R range is selected. The switching mechanism switches the first state and the second state in accordance with a level of pressures outputted from a range selector valve. | 04-14-2011 |
20110107863 | HYBRID POWER DRIVING SYSTEM - A hybrid power driving system of the present invention comprises an engine, a first clutch, a transmission mechanism including a transmission shaft, a first motor, a power supply and a hydraulic control system. The hydraulic control system may comprise an oil container; a first hydraulic cylinder which includes a cylinder and a piston to perform a reciprocating motion along the inner wall of the cylinder, used for controlling the engagement of the first clutch; a first oil pump driven by the first motor, configured to supply hydraulic oil from the oil container to the cylinder barrel of the first hydraulic cylinder; a controller which is electrically coupled with the first motor. The hydraulic control system may further comprise an additional motor and a second oil pump. The additional motor is electrically coupled with the power supply and the controller respectively. The second oil pump is driven by the additional motor, used for supplying hydraulic oil from the oil container to the cylinder barrel of the first hydraulic cylinder. | 05-12-2011 |
20110113912 | GEAR ACTUATOR - The invention relates to a gear actuator for shifting a gear, with an alley switch actuator ( | 05-19-2011 |
20110120250 | PUMP ARRANGEMENT - A pump arrangement for fluid in an automotive transmission system includes, but is not limited to a first, low-pressure pump stage and a second, high-pressure pump stage, the first pump stage supplying low-pressure fluid to a lubrication/cooling system and to the inlet of second pump stage, which supplies high pressure fluid to a hydraulic control system. Fluid from both systems is returned via a reservoir and filter to the first pump stage. | 05-26-2011 |
20110138956 | ELECTRO-HYDRAULIC CONTROL SYSTEM FOR A DUAL CLUTCH TRANSMISSION - A hydraulic control system for a dual clutch transmission includes a source of pressurized hydraulic fluid, first and second actuator control devices in downstream fluid communication with the source of pressurized hydraulic fluid, and first and second clutch control devices in downstream fluid communication with the source of pressurized hydraulic fluid. A valve is in downstream fluid communication with the first and second actuator control devices. Selective activation of combinations of the control devices allows for a pressurized fluid to engage the dual clutch and an actuator in order to shift the transmission into a desired gear ratio. | 06-16-2011 |
20110138957 | ACTUATING DEVICE FOR A SHIFT ELEMENT OF A TRANSMISSION DEVICE WHICH CAN BE APPLIED WITH AN ACTUATING PRESSURE - An actuating device for a shift element of a transmission which is acted upon by a hydraulic actuating pressure (p_B | 06-16-2011 |
20110146438 | CONTROL SYSTEM FOR ELECTRONIC RANGE SELECTION IN A DUAL CLUTCH TRANSMISSION AND FOR A DIFFERENTIAL IN A TRANSMISSION - The present invention provides a system for shifting or controlling a dual clutch transmission where the transmission may operate in at least a first mode of operation and a second mode of operation. The system includes a controller and a plurality of solenoids in fluid communication with a valve assembly. Selective activation of the solenoids by the controller engages the valve assembly to provide the first mode and the second mode of operation. | 06-23-2011 |
20110174107 | POWER TRANSMISSION DEVICE AND VEHICLE HAVING THE SAME - A manual valve is formed with a drain input port that closes if a shift is made to the D position, and opens for draining if a shift is made to the N position. A switching valve communicates an output port of a pressure regulating valve portion and an oil passage of a clutch and closes a drain port during engine operation when a line pressure is applied, and cuts off communication between the output port of the pressure regulating valve portion and the oil passage of the clutch and communicates the oil passage with the drain port during an engine automatic stop when the line pressure is not applied. The drain input port and the drain port are connected by a drain oil passage. | 07-21-2011 |
20110197695 | METHOD FOR THE OPERATION OF A CLUTCH OF A HYDRODYNAMIC TORQUE CONVERTER - A clutch of a hydrodynamic torque converter, which connects the drive input of the hydrodynamic torque converter to the drive output of the hydrodynamic torque converter, is actuated in a disengaging direction when a power at an auxiliary power take-off in a vehicle exceeds a predefined value. | 08-18-2011 |
20110197696 | METHOD FOR CONTROLLING A LOCK-UP CLUTCH OF A HYDRODYNAMIC TORQUE CONVERTER - A lock-up clutch of a hydrodynamic torque converter remains disengaged during shifts of a downstream transmission, when the drive motor is operated in the partial load range, and remains engaged during shifts of the downstream transmission, when drive motor is operated in a full load range. | 08-18-2011 |
20110214523 | MARINE GEAR SELECTION AND TRIM CONTROL - A system is operated by a method to provide hydraulic fluid for gear selection and trim in a marine drive by supplying hydraulic pressure to a trim actuator- when trim is required and diverting hydraulic fluid to an accumulator, when trim is not required and hydraulic pressure in the accumulator drops below a predetermined pressure. The hydraulic fluid is directed to the accumulator to maintain hydraulic pressure in the accumulator within predetermined limits and is directed from the accumulator to a gear selection actuator, when gear selection is required. | 09-08-2011 |
20110219903 | DRIVING FORCE CONTROL APPARATUS - A driving force control apparatus ( | 09-15-2011 |
20110219904 | HYDRAULIC CONTROL APPARATUS OF AUTOMATIC TRANSMISSION - A hydraulic control apparatus of an automatic transmission including a switching portion which, at the same time as a reverse range pressure oil passage and a discharge delay oil passage which delays an oil pressure output are connected, causes the reverse range pressure oil passage and discharge delay oil passage, by switching between the two, in order to communicate with a hydraulic servo. The switching portion causes the hydraulic servo and discharge delay oil passage to communicate when a manual valve is switched to an N range, and causes the hydraulic servo and reverse range pressure oil passage to communicate when the manual valve (MV) is switched to a D range or an R range. Because of this arrangement, it is difficult for oil, when discharged from the hydraulic servo, to drain at an R-N switching time, and it is easy for oil to drain in the D range or the like. | 09-15-2011 |
20110232409 | CONTROL APPARATUS FOR AUTOMATIC TRANSMISSION - There is provided, in one aspect of the present description, an automatic transmission. In one example, the automatic transmission comprises a transmission case, a valve body which is arranged in the transmission case, a control valve mechanism which controls oil pressures in parts of the automatic transmission and is installed in the valve body, and a solenoid valve which is attached to the valve body and is arranged at a first side of the valve body and in the transmission case. The automatic transmission further comprises an electronic control unit which controls the solenoid valve, is attached to the valve body, and is arranged at a second side of the valve body that is opposite to the first side across the valve body. | 09-29-2011 |
20110239803 | HYDRAULIC CONTROL SYSTEM FOR AUTOMATIC TRANSMISSION AND CONTROL SYSTEM FOR AUTOMATIC TRANSMISSION - An automatic transmission hydraulic control system with a first friction engagement element engaged at a first forward gear and establishment of a reverse gear, and a second friction engagement element engaged at least at a second different forward gear including a range pressure output unit outputting a reverse range pressure when a reverse range is selected, a first switching valve having a reverse range pressure input port receiving reverse range pressure, a control pressure input port receiving a control pressure from a linear solenoid valve, and first, second and third output ports. The third output port connected to a hydraulic servo of the second friction engagement element, and switched to a first state in which the reverse range pressure input port and the second output port, the control pressure input port and the third output port are communicated with each other and a second state in which the reverse range pressure input port and the first output port, the control pressure input port and the second output port are communicated with each other. The system also includes a second switching valve having a first input port connected to the first output port, a second input port connected to the second output port, and a fourth output port connected to a hydraulic servo of the first friction engagement element, and switched to a third state in which the second input port and the fourth output port are communicated with each other and a fourth state in which the first input port and the fourth output port are communicated with each other; a first on/off solenoid valve outputting a signal pressure for switching the first switching valve; and a second on/off solenoid valve outputting a signal pressure for switching the second switching valve. | 10-06-2011 |
20110239804 | CONTROL DEVICE - A control device for controlling a transmission device configured such that when the speed change mechanism performs switching to a shift speed with a different speed ratio, special speed change control is executed in which a disengagement hydraulic pressure, is lowered to cause a disengagement element to slip, and in which the disengagement element is maintained in a slipping state over an entire speed change process. In the case where slipping of the disengagement element is not detected within a predetermined time after the disengagement hydraulic pressure is lowered at start of the special speed change control, pressure increase correction is performed in which an engagement hydraulic pressure, which is a hydraulic pressure of hydraulic oil for an engagement element that is a friction engagement element to be engaged, is raised until slipping of the disengagement element is detected. | 10-06-2011 |
20110247443 | HYDRAULIC CONTROL APPARATUS FOR AUTOMATIC TRANSMISSION - A hydraulic control apparatus for an automatic transmission has a circulating oil supply passage that supplies circulating oil to a starting apparatus, a circulating oil discharge passage that discharges circulating oil from the starting apparatus, and a speed change mechanism oil supply passage that supplies oil to a speed change mechanism. The oil discharged from an oil pump is supplied to the starting apparatus and the speed change mechanism. A first flow rate changing device that can change the flow rate of the circulating oil is arranged in the circulating oil discharge passage. A first flow rate instructing portion output a command to the flow rate changing device to change the flow rate when the amount of oil discharged from the oil pump is low, and reduces the flow rate to the starting apparatus, which enables the hydraulic pressure necessary for shifting to be obtained in the speed change mechanism. | 10-13-2011 |
20110303040 | ELECTRO-HYDRAULIC FAILURE RECOVERY CONTROL FOR DUAL CLUTCH TRANSMISSION - A control for a multi-speed automatic vehicle transmission includes electrical and hydraulic components, such as pressure control valve systems in fluid communication with shift valves and electrohydraulic actuators. The control includes electrohydraulic features configured to enable the transmission to respond to an electrical failure whether the transmission is in neutral, a reverse range, or one of a plurality of forward ranges. | 12-15-2011 |
20110314943 | Control device for an automated geared transmission - In a control arrangement for an automated gear shift transmission, particularly a dual clutch transmission, which provides for a plurality of functionalities with a relatively small number of slides and control valves, a first gear slide, which is assigned to a first shift device and by means of which an actuation pressure can be applied to the first shift device, has a first and a second supply input for the first and second movement direction of the piston. A supply pressure slide, by means of which a supply pressure can be directed to the gear slide, has first and second supply outputs, which are respectively connected to the first and second supply inputs of the gear slide. The supply pressure slide is designed in such a manner that it can direct a supply pressure optionally to one of the two supply outputs. | 12-29-2011 |
20110314944 | Control device for an automated gear shift transmission - In a control arrangement for an automated gear shift transmission, particularly a dual clutch transmission with a partial transmission having two gears which must not be simultaneously engaged, simultaneous engagement of the two gears of the partial transmission is prevented by a gear actuation system which has a first and a second gear slide wherein a second gear shift control pressure of the second gear slide counteracts the first gear shift control pressure of the first gear slide so that the first gear slide is blocked by the second gear shift control pressure. | 12-29-2011 |
20110314945 | Hydraulic control arrangement for an automated shift transmission - In a hydraulic control arrangement for an automated shift transmission, in particular a dual clutch transmission in a motor vehicle including a hydraulic control arrangement, the hydraulic control arrangement has a main pump and a controllable additional pump which jointly ensure that oil is supplied to the hydraulic control arrangement. The additional pump can feed into a control channel of a lubricating pressure slide and build up an adjustable lubricating fluid control pressure. The lubricating fluid pressure in the lubricating cooling system is adjusted in a simple and inexpensive manner by lubricating pressure slide changes modifying the lubricating control pressure in the lubricating cooling system. | 12-29-2011 |
20120017716 | SYNCHRONIZER ACTUATION ASSEMBLY - A synchronizer actuation assembly for actuating at least one synchronizer member includes a barrel cam, at least one shift fork, a hydraulic piston assembly, and a motion converter. The barrel cam includes at least one cam groove that circumscribes the barrel cam and defines at least a neutral position and a first engaged position. The at least one shift fork has a first end portion disposed in the at least one cam groove and a second forked end portion. The hydraulic piston assembly includes a housing and a piston disposed in the housing. The motion converter includes a translatable input member engaged with the piston of the hydraulic piston assembly, a rotatable output member rotatably coupled with the barrel cam, and a direction selection mechanism. The translatable input member is selectively rotatably coupled with the rotatable output member in a first rotational direction or a second rotational direction. | 01-26-2012 |
20120073398 | MANUAL VALVE CONTROL FOR MULTI-SPEED PLANETARY TRANSMISSION - A manual valve control for a multi-speed vehicle transmission is provided. Electronic and hydraulic components are provided, including trim valve systems that are multiplexed by a shift valve and a manual valve. The trim valves and shift valve are self-diagnosing via a plurality of multiplexed pressure switches. The control enables single and double range shifts among the multiple forward speed ratios, including shifts to and from sixth and higher forward ratios, reverse and neutral. The control also includes a reduced engine load at stop feature. In addition, a power off/limp home feature provides a plurality of failure modes, including a failure mode for sixth and higher forward speed ratios. | 03-29-2012 |
20120079905 | Hydraulic Control for Powershift Transmission - A method for controlling a transmission includes using signals of first solenoids to control first and second clutches, servos of first gears and servos of second gears, using signals of a second solenoid to establish a flow rate to cool the clutches and to actuate the servo that is associated with a selected gear, and using signals of a third solenoid to direct the flow rate to one of the clutches and to engage the selected gear. | 04-05-2012 |
20120090420 | CONTROL OF TORQUE TRANSFER BETWEEN AN ENGINE AND A MANUAL TRANSMISSION - A system for controlling a transfer of torque from an engine to a manual transmission having a plurality of shiftable gears includes a selectively releasable and re-engageable clutch. The clutch is arranged inside the transmission and configured to transmit torque of the engine to the transmission when the clutch is in an engaged state. The system also includes a lever operatively connected to the transmission and movable to shift the gears. Additionally, the system includes an input device arranged on the lever and operable to selectively release and re-engage the clutch. A vehicle employing such a system is also provided. | 04-19-2012 |
20120137811 | Vehicle Having a Transmission and a Selection Element for Shifting Gears - A vehicle includes a transmission having at least one controllable actuator provided for engaging and/or disengaging at least one transmission gear, and a selection element to be operated manually, by which the actuator can be controlled, wherein. In order to engage a transmission gear, the selection element must first be moved in the direction of a specified end position assigned to the corresponding transmission gear. The selection element can be moved into the end position assigned to the corresponding transmission gear only when the corresponding transmission gear is actually engaged. | 06-07-2012 |
20120144945 | SINGLE-PISTON THREE-POSITION HYDRAULIC ACTUATOR - An actuator assembly includes a housing, a piston disposed within a portion of the housing. The piston has a movable range along a working-axis, and separates a first volume and a second volume within the housing. The assembly also includes a biasing feature disposed within the second volume, where the piston is configured to engage the biasing feature within a first portion of the movable range, and configured to not engage the biasing feature within a second portion of the movable range. | 06-14-2012 |
20120144946 | METHOD OF CONTROLLING A HYDRAULIC CONTROL SYSTEM FOR A DUAL CLUTCH TRANSMISSION - A hydraulic control system for a dual clutch transmission includes a plurality of solenoids and valves in fluid communication with a plurality of clutch actuators and with a plurality of synchronizer actuators. The clutch actuators are operable to actuate a plurality of torque transmitting devices and the synchronizer actuators are operable to actuate a plurality of synchronizer assemblies. Selective activation of combinations of the solenoids allows for a pressurized fluid to activate at least one of the clutch actuators and synchronizer actuators in order to shift the transmission into a desired gear ratio. | 06-14-2012 |
20120167704 | DEVICE FOR THE PULSED RELEASE OF AN AMOUNT OF FLUID WHICH CAN BE STORED IN AN ACCUMULATOR HOUSING - 1. Device for the pulsed release of an amount of fluid ( | 07-05-2012 |
20120272768 | DEVICE FOR OPERATING A TRANSMISSION APPARATUS HAVING A PLURALITY OF ELECTROHYDRAULICALLY ACTUATED FRICTION-FIT AND FORM-FIT SHIFT ELEMENTS - A mechanism for actuating a transmission having shifting elements. A self-holding valve device is movable into a first position, by a pilot pressure, against a force directed to a second position and held by a pressure holding signal in the first position. Transmission of a pressure signal, to a switching valve, is blocked by the self-holding valve device in the first position but, in the second position, is applied to the switching valve. When the driver sets the switching valve to a first shift position, the pressure signal can be applied to valve devices of at least two of the shifting elements that produce an actuating pressure and, in a second shift position of the switching valve, the onward transmission of the pressure signal, to the valve devices of the shifting elements that produce an actuating pressure, is blocked in the area of the switching valve. | 11-01-2012 |
20120272769 | HYDRAULIC ARRANGEMENT FOR ACTUATING A PLURALITY OF SHIFT RAILS - A hydraulic arrangement by which a plurality of shift rails of a transmission are actuated, including one double acting cylinder per shift rail by which the respective shift rail can be moved back and forth. A first hydraulic valve is connected upstream of the plurality of shift rails and has a first output and a second output, by which a first shift pressure and a second shift pressure for actuating the shift rails can be provided. A second hydraulic valve is connected between the first hydraulic valve and two of the shift rails, and by which it is selectively possible for the first output of the first hydraulic valve to be associated with one of the double acting cylinders of the two shift rails, and the second output of the first hydraulic valve to be associated with the other double acting cylinder of the two shift rails. | 11-01-2012 |
20120272770 | Transmission Actuator - The invention relates to a transmission actuator for actuating a manual transmission in an automated manner, comprising a lane selection actuating cylinder ( | 11-01-2012 |
20120325038 | HYDRAULIC SYSTEM FOR ACTUATING AN INTERLOCKING SWITCHING ELEMENT OF A GEARING DEVICE - A hydraulic system for actuating an interlocking shifting element of a transmission which comprises two piston chambers and a piston element that delimits the piston chambers. The piston element can be acted upon in one piston chamber by a pressure to open the shifting element and, in the other piston chamber, by another pressure to close the shifting element. Pressure can be delivered by a valve to two piston chamber and the valve can be actuated by an actuator by a pilot pressure. The valve and the electro-hydraulic actuator are designed and functionally connected to one another such that, in the event of a pressure drop, a total hydraulic force, acting to close the shifting element, is applied to the piston element and, if the current supply to the actuator fails, a total hydraulic force acting, in the opening direction of the shifting element, acts upon the piston element. | 12-27-2012 |
20130025396 | HYDRAULIC SYSTEM FOR ACTUATING AT LEAST ONE SHIFTING ELEMENT OF A TRANSMISSION - A hydraulic system ( | 01-31-2013 |
20130055840 | ELECTRO-HYDRAULIC ACTUATION GROUP FOR AN AUTOMOTIVE SERVO-ASSISTED MECHANICAL TRANSMISSION - In an automotive servo-assisted mechanical transmission, an electro-hydraulic actuation group has an actuation unit, a power unit able to provide hydraulic pressure to the actuation unit and an electronic control unit, the actuation and power units being equipped with respective components that are all mounted on a hydraulic casing of the actuation unit so as to define with one another a single assembly, at least part of the components being equipped with respective electrical connectors that are arranged in a manner such that they can all be engaged by a same multiple electrical connector device, electrically connectable to the electronic control unit. | 03-07-2013 |
20130104683 | SHIFT ARRANGEMENT FOR A MOTOR VEHICLE GEARBOX | 05-02-2013 |
20130112030 | AUTOMATIC TRANSMISSION HAVING HIGH PRESSURE ACTUATION AND LOW PRESSURE LUBE HYDRAULIC CIRCUIT - An automatic transmission having high pressure actuation and low pressure lube includes a hydraulic circuit ( | 05-09-2013 |
20130139633 | OIL SUPPLYING ASSEMBLY FOR TRANSMISSION OF VEHICLE - An oil supplying assembly for a transmission of a vehicle, which may supply oil to a clutch and a pulley of a transmission, may include a base member which is mounted to a transmission main body, and includes a first oil path supplying the oil to the clutch and an oil supply column which is integrally formed to the base member and of which a second oil path for supplying the oil to the pulley is formed thereto. | 06-06-2013 |
20130145883 | ELECTRONICALLY CONTROLLED RANGE VALVE FOR MULTI-SPEED PLANETARY TRANSMISSION - A shift by wire control for a multi-speed vehicle transmission is provided. The control includes a shift by wire shift valve in fluid communication with other shift valves and clutch trim valves to provide double blocking features in the neutral range and a reverse range. The shift by wire valve is configured with multiple differential areas to provide failure modes for all forward ranges. | 06-13-2013 |
20130220052 | RANGE SWITCHING DEVICE - A range switching device for performing switching the range of a transmission includes first control valve, a second control valve having a characteristic opposite to the first control, and first, second, third and fourth switching valves for controlling the transmission of oil pressures. The first and second switching valves cooperatively control the transmission of the oil pressure from the first control valve to a forward or reverse driving element (R). The third and fourth switching valve cooperatively control the transmission of the oil pressure from the second control valve to the forward or reverse driving element (R). The third and fourth switching valves each perform a substantially same oil pressure transmission when the state of the second and third actuators is reversed with respect to the first switching and second switching valves, respectively. | 08-29-2013 |
20130220053 | METHOD FOR DETERMINING AN OPERATING CONDITION OF A POSITIVELY ENGAGING SHIFTING ELEMENT OF A TRANSMISSION DEVICE - A method of determining an operating state of a form-locking shift element of a transmission apparatus that, at least for changing one operating state between a disengaged operating state and an engaged operating state, is pressurized with an actuating pressure by a pressure-conducting region of the transmission apparatus. The pressure of the pressure-conducting region is monitored. Depending on the progression of the pressure of the pressure-conducting region, while pressurizing the form-locking shift element with the actuating pressure for changing the operating state, checking whether the form-locking shift element has the requested operating state. | 08-29-2013 |
20130233110 | RANGE SWITCHING DEVICE - Provided is a range switching device for performing switching among drive, reverse, and neutral ranges of a transmission. The device includes a first switching valve driven by a first actuator and a second switching valve driven by a second actuator. The valves switch an oil channel to transmit the oil pressure from an oil pressure supply source between first state and second states. When the first and second switching valves are in the first and second states respectively, the oil pressure is transmitted to the forward fastening element. When the first and second switching valves are in the second state and first states respectively, the oil pressure is transmitted to the reverse fastening element. When both the valves are in the first or second state, oil pressure transmission to the forward and reverse fastening elements is substantially blocked. | 09-12-2013 |
20130233111 | CONTROL APPARATUS FOR AUTOMATIC TRANSMISSION - A control apparatus for an automatic transmission including three frictional engagement elements is configured to set engagement pressures of first and second frictional engagement elements at the time when a predetermined shift speed is established such that a torque capacity of a third frictional engagement element becomes smaller than torque capacities of the first and second frictional engagement elements in the case where an engagement pressure is generated in the third frictional engagement element at the time when the predetermined shift speed is established. | 09-12-2013 |
20130239730 | Electro-Hydraulic Control Including Blocking Features for Multi-Speed Automatic Transmission - A control for a multi-speed automatic vehicle transmission is provided. Electrical and hydraulic components are provided, including pressure control or “trim” valve systems in fluid communication with shift valves and electrohydraulic actuators to selectively engage and disengage the transmission clutches or other shift mechanisms. Pressure switches are provided for the trim valves and shift valves. The fluid connections between the trim valve systems and the shift valve systems are configured to reduce the total number of valves and fluid passages required and to reduce the size of at least one of the valves. Clutch blocking features are provided. Power off limp home and reduced engine load at stop features are provided in all forward ranges, and control of double transition shifts is also provided. | 09-19-2013 |
20130298713 | OIL PRESSURE CONTROL DEVICE OF AUTOMATIC TRANSMISSION - An oil pressure control device includes: line pressure adjusting means for adjusting the line pressure; line pressure switching means for switching, in two stages, the line pressure adjusted by the line pressure adjusting means; a linear solenoid valve that adjusts a required oil pressure for engaging frictional engagement elements with one another by engagement force, which is required thereby, by adjusting a pressure of hydraulic oil with the line pressure; and control means for controlling a value of a current supplied to the linear solenoid valve. The control means performs control to differentiate the value of the current, which is supplied to the linear solenoid valve in order to adjust (obtain) the same required oil pressure, in response to the line pressure switched by the line pressure switching means. | 11-14-2013 |
20130312561 | ELECTRO-HYDRAULIC CONTROL APPARATUS FOR A MOTOR-VEHICLE TRANSMISSION WITH AT LEAST FIVE FORWARD GEARS AND ONE REVERSE GEAR - An electro-hydraulic control apparatus for a motor-vehicle transmission having at least five forward gears and one reverse gear, including first, second and third shift forks, each movable in at least one engagement position to engage a respective gear, first, second and third hydraulic actuators each arranged to control the movement of a respective shift fork in the respective at least one engagement position, and a slide valve selectively movable into one of at least three operating positions in each of which the slide valve selects a respective hydraulic actuator, wherein a first operating position is an end-of-travel position and corresponds to the selection of the first hydraulic actuator, and wherein a second operating position is also an end-of-travel position and corresponds to the selection of the second hydraulic actuator. | 11-28-2013 |
20130319155 | HYDRAULIC CONTROL SYSTEM FOR AN AUTOMATIC TRANSMISSION HAVING ANALOG ELECTRONIC TRANSMISSION RANGE SELECTION - A hydraulic control system for a transmission includes a source of pressurized hydraulic fluid that communicates with an electronic transmission range selection (ETRS) subsystem. The ETRS subsystem includes an ETRS valve, a park mechanism, a mode valve, a latch valve assembly, and a plurality of solenoids. The ETRS subsystem is configured to provide desired operating conditions during a plurality of potential failure conditions. | 12-05-2013 |
20130319156 | DISCRETE MECHANISM FOR ELECTRONIC TRANSMISSION RANGE SELECTION - A hydraulic control system for a transmission is provided. The hydraulic control system includes a source of pressurized hydraulic fluid that communicates with a discrete electronic transmission range selection (ETRS) subsystem. The hydraulic control system includes first and second mode valves located downstream of a hydraulic fluid pressure source. The mode valves are supplied with fluid via one or more solenoid valves or other valves. The mode valves have a plurality of ports configured to transfer pressurized hydraulic fluid. The first mode valve transfers pressurized hydraulic fluid from the source to the second mode valve. The second mode valve transfers pressurized hydraulic fluid from the first mode valve to one of drive or reverse. An electro-hydraulic circuit for pulling the transmission out of park and putting the transmission into park is also provided. A park sensor assembly including a Hall Effect sensor switch is also provided. | 12-05-2013 |
20130327172 | HYDRAULIC CONTROL SYSTEM FOR AN AUTOMATIC TRANSMISSION - A hydraulic control system for a transmission of a motor vehicle includes a source of pressurized hydraulic fluid that communicates with an analog electronic transmission range selection (ETRS) subsystem or a manual valve. The ETRS subsystem includes an ETRS valve, a park servo, a park mechanism, a mode valve, and a plurality of solenoids. The ETRS and manual valve communicate with a clutch actuator subsystem that engages a one-way clutch and six clutches/brakes. | 12-12-2013 |
20130333508 | HYDRAULIC CONTROL SYSTEM FOR A CONTINUOUSLY VARIABLE TRANSMISSION - A hydraulic control system for a continuously variable transmission includes a pressure regulator subsystem, a ratio control subsystem, a torque converter control (TCC) subsystem, a variable lubrication control subsystem, a variator clamping subsystem, and a clutch control subsystem. The variable lubrication control subsystem allows for increased and decreased oil flow to components of the variable transmission based on demand. The pressure regulator subsystem provides binary line pressure control to the lubrication subsystem. | 12-19-2013 |
20130340556 | Methods and systems for improving the operation of transmissions for motor vehicles - A method in which the control lockup relay of a “factory installed” A750E, A750F, or A761E automotive transmission is removed from the original valve bore in which it is received, the width of the valve bore in enlarged, and the original control lockup relay is replaced by a wider control lockup relay accommodated in the enlarged valve bore for preventing cross-leaking between an hydraulic circuit applying pressure to the relay and an exhaust to maintain a predetermined applied pressure for normal operation of the relay. The control valve plunger of the lockup control valve of the “factory installed” transmission is replaced by a wider control valve plunger for preventing leaks between the hydraulic circuit applying hydraulic fluid pressure to the lockup control valve and an exhaust for maintaining the hydraulic pressure applied to the lockup control valve above a predetermined pressure for preventing erratic operation of the lockup control valve. | 12-26-2013 |
20140020494 | METHOD FOR CONTROLLING AN AUTOMATED TRANSMISSION - A method of controlling an automated transmission with positioning cylinders ( | 01-23-2014 |
20140026703 | Main Modulation Calibration Using Control Main Valve - Various embodiments of methods, apparatus and systems that calibrate main modulation of an electro-hydraulic control system for a vehicle transmission are presented. Some embodiments calibrate regulator control signals that cause a main regulator valve to develop a main line pressure based upon status of a control main valve that develops a control main pressure based upon the main line pressure. | 01-30-2014 |
20140076086 | DEVICE FOR TRANSLATABLY CONTROLLING THE MOVEMENT OF A GEAR CHANGE FORK FOR A MOTOR VEHICLE GEARBOX - The invention relates to a device which comprises a gear change fork ( | 03-20-2014 |
20140116175 | Engine-Off Auxiliary Hydraulic Pressurization System and Method for a Transmission - An auxiliary hydraulic pressurization system for use with a vehicle including a transmission having a hydraulic reservoir, a hydraulic circuit, and a main pump is disclosed herein. The auxiliary hydraulic pressurization system includes an auxiliary pump and a controller. The auxiliary pump has a low side adapted to be coupled to the hydraulic reservoir and a high side adapted to be coupled to the hydraulic circuit. The controller is electrically connectable to the auxiliary pump and is configured to turn on the auxiliary pump in response to receipt of a signal indicating that the vehicle is in a stop condition to maintain hydraulic pressurization of the hydraulic circuit of the transmission when the vehicle is in the stop condition. | 05-01-2014 |
20140123799 | VALVE INTEGRATED PARK INHIBIT SOLENOID ASSEMBLY - A system for locking a Park device in a transmission in an out-of-Park mode of operation includes a valve body that defines a bore, a solenoid connected to the valve body, a lock feature disposed in the valve body and interconnected with the solenoid, and a servo piston disposed within the bore of the valve body. The servo piston has a detent and the servo piston is interconnected to the Park device and is moveable between a first position and a second position. The detent is radially aligned with the lock feature when the servo piston is in the first position. Activation of the solenoid locks the lock feature into the detent of the servo piston to lock the Park device of the transmission in the no-Park mode. | 05-08-2014 |
20140174234 | BICYCLE CONTROL DEVICE - A bicycle control device includes a housing member, a shift-operating mechanism, a hydraulic fluid pressure generator and a control lever member. The housing member has an attachment part for attachment to a handlebar, and a grip part extending longitudinally between first and second ends of the grip part. The shift-operating mechanism is coupled to a shifting device by a control cable. The hydraulic fluid pressure generator has a cylinder, a piston movably disposed within the cylinder to generate fluid pressure for controlling a braking device, and a rod part coupled to the piston. The control lever member has a cam member arranged to actuate the rod part, and a first operating lever coupled to the cam member. The first operating lever is pivotal around a first axis relative to the housing member and actuates the cam member by pivoting around the first axis. | 06-26-2014 |
20140196559 | Electronic Transmission Control System - Embodiments of the present invention are directed to providing a transmission control system that enables an operator to quickly and effortlessly shift or change gears/selections/modes, in either a sequential or non-sequential manner without incurring the undesired unloading of driveline motion, while retaining consistent launches/start offs. More particularly, an improved transmission control system with an electronic gear shifter is presented for use in a vehicle or machine having an engine and transmission with a plurality of gear ratios or selections. The system allows the operator to shift gears/selections in a normal sequential progression or a progression that skips numerical order. Thus, the vehicle or machine may be accelerated and/or decelerated at a faster and more predictable rate to achieve greater performance in certain operating conditions. | 07-17-2014 |
20140208882 | GEARBOX FOR A MOTOR VEHICLE - Described herein is a gearbox for a motor vehicle including a plurality of forward gear ratios and at least one reverse gear ratio, the gearbox including an electro-hydraulic actuation unit configured for selection and engagement of the gear ratios. | 07-31-2014 |
20140305243 | Valve System for Controlling a System Pressure Control System - A valve system for controlling a system pressure control system, in particular a hydraulic control unit of an automatic transmission, includes a multi-stage system pressure valve, a pilot valve and a control valve with a control piston downstream from the pilot valve that governs the pressure at a differential area of the system pressure valve, depending on the pilot pressure. The pilot pressure/system pressure characteristic curve features a continuous development, and whereas, from a predefined pilot pressure, on the basis of a sudden change to the dependency of the change to the system pressure as a function of the change to the pilot pressure, the gradient of the system pressure as a function of the pilot pressure is significantly steeper than that prior to the predefined pilot pressure. | 10-16-2014 |
20140360302 | HYDRAULIC CONTROL SYSTEM WITH ETRS FOR A CONTINUOUSLY VARIABLE TRANSMISSION - A hydraulic control system for a CVT includes a pressure regulator subsystem, a ratio control subsystem, a torque converter control (TCC) subsystem, a clutch control subsystem, an electronic transmission range selection subsystem, and is enabled for automatic engine start/stop (ESS) functionality. | 12-11-2014 |
20140366669 | TRANSMISSION PLATE - A transmission plate is provided for use on both a diesel transmission casting and a gasoline transmission casting. The plate includes a continuous perimeter edge without a perimeter oil flow notch to inhibit firm shifting of a torque converter connected to the transmission. The plate also has one or more pockets formed therein to reside above a wall of the transmission casting and thereby permit fluid flow over the wall without the need to drill a hole through the wall of the casting. The plate further includes a solid portion free from an oil flow hole so as to preclude fluid flow from a fluid cavity in the transmission casting and thereby preventing downshifting from second gear to first gear by the transmission. | 12-18-2014 |
20150020632 | AUTOMATIC TRANSMISSION CONTROL DEVICE - A control device for controlling an automatic transmission determines whether a fluid pressure of the operation fluid acting on a friction engagement element that is switched from a released-state to an engaged-state is in a fully-decreased state. If determined that the fluid pressure is not in a fully-decreased state, control of a manual valve is delayed. In such manner, the hydraulic circuit is switched by the manual valve after the full decrease of the fluid pressure of the operation fluid acting on the just-engaged friction engagement element. As a result, an abrupt rise of the fluid pressure is prevented and a shock in the automatic transmission is reduced. | 01-22-2015 |
20150020633 | FAST VALVE ACTUATION SYSTEM FOR AN AUTOMATIC TRANSMISSION - A fast valve actuation system for an automatic vehicle transmission includes a pair of spring-biased shift valves. Solenoids control the application of pressurized hydraulic fluid to the head of each of the shift valves. Each shift valve has at least one port that is coupled to a fluid chamber of a torque transferring mechanism of an automatic transmission. The position of each of the shift valves determines whether its ports are connected with fluid pressure. Fluid passages connect the head of each shift valve to the spring pocket of the other shift valve. | 01-22-2015 |
20150027259 | ELECTRONICALLY CONTROLLED RANGE VALVE FOR MULTI-SPEED PLANETARY TRANSMISSION - A shift by wire control for a multi-speed vehicle transmission is provided. The control includes a shift by wire shift valve in fluid communication with other shift valves and clutch trim valves to provide double blocking features in the neutral range and a reverse range. The shift by wire valve is configured with multiple differential areas to provide failure modes for all forward ranges. | 01-29-2015 |
20150068340 | HYDRAULIC PRESSURE SUPPLY SYSTEM OF AUTOMATIC TRANSMISSION - A hydraulic pressure supply system of an automatic transmission for a vehicle is disclosed. The hydraulic pressure supply system is adapted to supply surplus hydraulic pressure recircluated from a high pressure portion and a shift control portion to a low pressure portion by connecting lines of the high pressure portion and the shift control portion to the low pressure portion. | 03-12-2015 |
20150068341 | GEAR ENGAGEMENT MECHANISM FOR TRANSMISSIONS AND RELATED METHODS - A position sensor system is useful for monitoring positions of shifters in transmissions and other applications. The position sensing system has an array of magneto resistive sensors and a controller configured to determine a position of a magnet along a path by triangulation. Some embodiments are relatively insensitive to fluctuations in a distance between the sensors and the path. Also described is an actuating assembly comprising a movable cylinder and a fixed rod. The actuating assembly may be applied for moving synchronizers or the like in power transmissions. | 03-12-2015 |
20150075314 | HYDRAULIC CONTROL FOR ENGINE START STOP TRANSMISSION SYSTEM - A hydraulic control system for a clutch of a transmission having a plurality of torque transmitting mechanisms and includes a source of pressurized hydraulic fluid, a clutch pressure regulating valve, a clutch pump valve, a first and a second fluid flow check valve, a pressure valve, a first torque transmitting mechanism actuation device, and a pressure control solenoid. | 03-19-2015 |
20150075315 | Electro-Hydraulic Control Including Blocking Features for Multi-Speed Automatic Transmission - A control for a multi-speed automatic vehicle transmission is provided. Electrical and hydraulic components are provided, including pressure control or “trim” valve systems in fluid communication with shift valves and electrohydraulic actuators to selectively engage and disengage the transmission clutches or other shift mechanisms. Pressure switches are provided for the trim valves and shift valves. The fluid connections between the trim valve systems and the shift valve systems are configured to reduce the total number of valves and fluid passages required and to reduce the size of at least one of the valves. Clutch blocking features are provided. Power off limp home and reduced engine load at stop features are provided in all forward ranges, and control of double transition shifts is also provided. | 03-19-2015 |
20150128742 | SHIFT ACTUATOR - A shift actuator of the present invention includes a first and a second fluid pressure chamber for providing fluid pressure to each of a first and a second piston defined in a cylinder and a shift operating member inserted and disposed between the first piston and the second piston to move back and forth along the axial direction. On a side surface to the axial direction of the cylinder, an opening portion to which the shift operating member is inserted is formed. The opening portion is provided opening only to a part of the circumferential direction of the cylinder, and a lower end of the opening portion in a circumferential direction of the cylinder reaches a just under position in the vertical direction of the cylinder. This enables to discharge foreign matters included in hydraulic oil in the cylinder according to a stroke of the piston, with a simple configuration. | 05-14-2015 |
20150128743 | METHOD OF CONTROLLING A HYDRAULIC CONTROL SYSTEM FOR A DUAL CLUTCH TRANSMISSION - A hydraulic control system for a dual clutch transmission includes a plurality of solenoids and valves in fluid communication with a plurality of clutch actuators and with a plurality of synchronizer actuators. The clutch actuators are operable to actuate a plurality of torque transmitting devices and the synchronizer actuators are operable to actuate a plurality of synchronizer assemblies. Selective activation of combinations of the solenoids allows for a pressurized fluid to activate at least one of the clutch actuators and synchronizer actuators in order to shift the transmission into a desired gear ratio. | 05-14-2015 |
20150135876 | Transmission Device with a Hydraulic System Including a Pump Device - A transmission device ( | 05-21-2015 |
20150354697 | DUAL SUMP TRANSMISSION HYDRAULIC CONTROL SYSTEM - A hydraulic control system includes a primary sump and an auxiliary sump. When the transmission fluid is warm, fluid remains in the auxiliary sump reducing the volume of oil in circulation throughout the transmission to reduce parasitic losses. An oil control valve is designed to block flow of oil from the auxiliary sump to the primary sump when the fluid is warm and to allow flow when the fluid is cold. The oil control valve also responds to transmission line pressure. At moderate temperatures, fluid is held in the auxiliary sump when the engine is running but drains back to the primary sump when the engine is off. | 12-10-2015 |
20160053886 | Valve for Locking and Releasing a Hydraulically Actuated Shifting Element - A stop valve assembly is provided for the locking and unlocking of at least one hydraulic chamber of a shift element that is applied with operating pressure and is coaxially arranged at a shaft in a transmission housing of an automatic transmission of a motor vehicle. At least one first stop valve for lowering the operating pressure of the shift element and at least one second stop valve for raising the operating pressure of the shift element are provided. | 02-25-2016 |
20160069451 | ELECTRONIC TRANSMISSION RANGE SELECTION SUBSYSTEM IN A HYDRAULIC CONTROL SYSTEM FOR AN AUTOMATIC TRANSMISSION - A hydraulic control system for a transmission is provided. The hydraulic control system includes a source of pressurized hydraulic fluid that communicates with an electronic transmission range selection (ETRS) subsystem. In one example, the ETRS subsystem includes an ETRS control valve, a park servo that controls a park mechanism, a plurality of solenoids, and a park inhibit solenoid assembly. In another example, the ETRS subsystem includes an ETRS control valve, an ETRS enable valve, a park servo that controls a park mechanism, a plurality of solenoids, and a park inhibit solenoid assembly. | 03-10-2016 |
20160076637 | INTEGRATED GEARBOX LUBE AND CONTROL SYSTEM - A gearbox system includes a gearbox having integrated therein a pump system, a plurality of fluid passages and a clutch control system. The pump system is in fluid communication with the clutch control system via the fluid passages to flow at least one pressurized stream. A first pressurized stream controls a first pressure-responsive device included in the clutch control system. The gearbox system further includes a hydro-mechanical control unit (HMCU) in fluid communication with the gearbox to receive a second pressurized stream and to generate at least one actuator control stream. The actuator control stream controls an actuator integrated in the gearbox. | 03-17-2016 |
20160084372 | ENGINE-OFF AUXILIARY HYDRAULIC PRESSURIZATION SYSTEM AND METHOD FOR A TRANSMISSION - An auxiliary hydraulic pressurization system for use with a vehicle including a transmission having a hydraulic reservoir, a hydraulic circuit, and a main pump is disclosed herein. The auxiliary hydraulic pressurization system includes an auxiliary pump and a controller. The auxiliary pump has a low side adapted to be coupled to the hydraulic reservoir and a high side adapted to be coupled to the hydraulic circuit. The controller is electrically connectable to the auxiliary pump and is configured to turn on the auxiliary pump in response to receipt of a signal indicating that the vehicle is in a stop condition to maintain hydraulic pressurization of the hydraulic circuit of the transmission when the vehicle is in the stop condition. | 03-24-2016 |
20160091084 | FLUID PRESSURE CONTROL CIRCUIT FOR TRANSMISSION - A fluid pressure control circuit for a transmission, includes plural electromagnetic valves each switching one of engagement elements between an engaged state and a disengaged state, plural passages configured to connect the engagement elements to a fluid pressure source, a first electromagnetic valve corresponding to one of the electromagnetic valves and switching one of the engagement elements between the engaged and disengaged states, a second electromagnetic valve corresponding to another of the electromagnetic valves and switching another of the engagement elements between the engaged and disengaged states, and a shut-off valve, when the first electromagnetic valve and the second electromagnetic valve are open, closing the passages among the first electromagnetic valve, the engagement elements switched by the first electromagnetic valve and the fluid pressure source with the use of the fluid pressure to establish a closed state, and maintaining the closed state with the use of the fluid pressure. | 03-31-2016 |
20160102754 | Modular Control Device for a Transmission of a Commercial Vehicle - A control device is provided for a transmission having at least three shift actuators for the gear selection, a plurality of valves for actuating the shift actuators and a further plurality of valves for actuating the clutch. The shift actuators, the valves for actuating the shift actuators and the valves for actuating the clutch are combined in a common housing and that, within this housing, the shift actuators are grouped into a spatially connected shift group, the shift actuator valves are grouped into a spatially connected valve group and the clutch actuator valves are grouped into a further spatially connected valve group, wherein the shift group and the two valve groups and do not spatially overlap. | 04-14-2016 |
20160123461 | NORMALLY HIGH ACTING LINEAR FORCE SOLENOID - A solenoid assembly is disposed in a bore of a valve body where the bore includes a plurality of ports. The solenoid assembly includes a bushing or sleeve disposed in the bore. The sleeve has at least one slot that is aligned with at least one of the plurality of ports. A valve is slidably disposed within the sleeve. A solenoid has a movable armature configured to move the valve. | 05-05-2016 |
20160131249 | METHOD FOR DETERMINING THE DRAINAGE CONTROL OF A HYDRAULIC SWITCHING ELEMENT OF A TRANSMISSION - A method for determining a draining behavior of a hydraulically actuated transmission shifting element. By applying actuating pressure, the shifting element is changed from a completely drained, open operating condition to a completely filled closed operating condition, and the reference filling time, until the closed condition has been reached, is determined. Upon recognition of the closed condition, then by adjusting the actuating pressure for a predefined draining time, the shifting element is changed to its open condition and, thereafter, again completely filled and closed. Upon recognition of the closed condition, the shifting element is actuated direction toward the open condition by reducing the actuating pressure. Then, before completely opening, the shifting element is again returned to its closed operating condition and the filling time, until the partially drained shifting element has reached the completely filled and closed operating condition, is determined. | 05-12-2016 |
20160138706 | TRANSMISSION DEVICE FOR A MOTOR VEHICLE - A transmission device for a motor vehicle is disclosed. The transmission device includes at least one coupling unit, which for non-rotatable connection of two coupling elements, has a friction-locking unit and a form-locking unit connected in parallel to the friction-locking unit. The device further includes a first hydraulic and/or pneumatic actuator for actuation of the form-locking unit, a second hydraulic and/or pneumatic actuator for actuating the friction-locking unit, and a directional valve for controlling the first actuator provided for actuation of the form-locking unit. The directional valve has a control line connection which in at least one operational state is connected in pressure terms to the second actuator provided for actuation of the friction-locking unit. | 05-19-2016 |
20160138710 | Actuating Device for a Manual Transmission and a Clutch Unit of a Commercial Vehicle - An actuating device is provided for a manual transmission having at least one clutch unit of a commercial vehicle. The actuating device includes transmission-actuating elements for the mechanical actuation of the manual transmission and clutch actuating elements for the fluidic actuation of the clutch unit. At least two actuating cylinders as transmission-actuating elements for actuating the manual transmission coupled thereto and at least one compressed-air connection as a clutch-actuating element for actuating the clutch unit connected thereto are arranged in a common carrier housing. | 05-19-2016 |
20160153549 | TRANSMISSION HYDRAULICS CONTROLLER | 06-02-2016 |
20160153554 | TRANSMISSION HYDRAULICS CONTROLLER | 06-02-2016 |
20160169375 | ELECTRONIC TRANSMISSION RANGE SELECTION SUBSYSTEM IN A HYDRAULIC CONTROL SYSTEM FOR AN AUTOMATIC TRANSMISSION | 06-16-2016 |
20160201796 | POWER TRANSMISSION DEVICE | 07-14-2016 |