Patent application number | Description | Published |
20080234099 | Control Valve Assembly for Controlling a Starting Clutch of an Automatic Transmission - The invention involves a control valve arrangement to activate at least one start-up clutch of a motor vehicle automatic transmission with at least one clutch control valve ( | 09-25-2008 |
20080234100 | Control Valve Arrangement for Controlling a Starting Clutch of an Automatic Transmission - A control valve arrangement having a clutch regulation valve ( | 09-25-2008 |
20080272322 | Proportional Pressure Control Valve Comprising a Pressure Jump in the Characteristic P/I Curve Thereof - An electromagnetic proportional pressure-control valve of a vehicle transmission which includes a magnet part, a hydraulic part and a spring operatively connecting the magnet part to the hydraulic part. The magnet part includes a coil, an armature and an armature bar. The hydraulic part includes first and second closing elements. The first closing element forms a flat seat and the second closing element a ball seat and the closing elements are opened and/or closed via a tappet rod. When no current is applied to the valve, the second closing element is closed and an gap (ΓΌ) in the first closing element is larger than one seventh a nominal width (NW) of the valve. The second closure area (A | 11-06-2008 |
20080277236 | Parking Brake System - A parking lock device for the power train of motor vehicles with automatic transmissions having an actuator and a locking mechanism that is operated by the actuator. A power take-off of the power train locked in a closed condition by the locking mechanism and is free to rotatable in open condition by the locking mechanism. The locking mechanism may be engaged by pressurizing a piston unit of the actuator in a locking direction and may be held in a disengaged condition by a snap-in locking device controlled by an electromagnetic actuator. The snap-in locking device may be deactivated by the electromagnetic actuator. The locking mechanism may be engaged with an emergency locking device and opened with an emergency unlocking device and activated with a common actuator mechanism so that manual activation of the actuator mechanism alternatively disengages or engages the locking mechanism. | 11-13-2008 |
20080277237 | Actuator Device For Actuating a Locking Mechanism - An actuating mechanism ( | 11-13-2008 |
20080296124 | Hydraulic System in Motor Vehicles - A hydraulic system in motor vehicles with at least one hydraulically actuated clutch, which entails minimized control complexity for supplying the clutch with hydraulic oil and which takes up less structural space. These characteristics are achieved essentially in that the pressure control of the hydraulically actuated clutch is effected directly and exclusively by an electrically driven and electronically controlled oil pump. | 12-04-2008 |
20090065075 | PRESSURE CONTROL VALVE - A pressure control valve ( | 03-12-2009 |
20090065722 | PRESSURE CONTROL VALVE - A pressure control valve having valve seats, an electromagnet, a magnetic coil, and an armature coupled to an anchor rod, which are axially slidable for biasing a part against a first valve seat to close a tank edge. A push rod, which is integral with the anchor rod, biases a locking element off a ball seat to open an inlet control edge. The cross-section of the inlet control edge can be modified depending on the temperature such that the cross-section is opened as widely as possible at low oil temperatures. The cross-section of the inlet control edge is reduced at high oil temperatures to the extent that a high valve dynamic of the follow-up slide valve is achieved, and the leakage oil flow is not significantly increased. | 03-12-2009 |
20090107136 | ELECTROHYDRAULIC TRANSMISSION CONTROLLER, TRANSMISSION DEVICE, AND A MOTOR VEHICLE DRIVE TRAIN - An electrohydraulic transmission controller ( | 04-30-2009 |
20090111636 | ELECTROYHYDRAULIC CONTROL DEVICE OF A GEAR UNIT - An electrohydraulic control device ( | 04-30-2009 |
20090112425 | Method for Operating an Automatic Gearbox - A method of operating an automatic transmission of a motor vehicle, in particular a variable-speed transmission. The automatic transmission includes at least five shift elements, at least three of which are engaged in a forward and a reverse gear to transfer torque or force. When disengaging gears for shifting the automatic transmission from a forward or reverse gear to a neutral position, at least one of the at least three shift elements that are engaged in the respective forward or reverse gear is completely disengaged. | 04-30-2009 |
20090206292 | METHOD OF OPERATING A TRANSMISSION SYSTEM VALVE CONFIGURATION - The invention describes a method for operating a transmission's valve system of a vehicle's drive train through a valve unit and said valve unit's electro-magnetic activator configuration. In a transmission's hydraulic system and being part of the vehicle's drive train, its hydraulic pressure value (p_EDS) can be employed and adjusted through a valve unit's configuration by applying to the electro-magnetic activator system a pulse-width-modulated current signal (i_EDS). The pulse-width modulated current signal (i_EDS) and its signal's amplitude (A) and/or its pulse duration (pw | 08-20-2009 |
20090215587 | Gear control device - An automatic transmission control device with a hydraulic control system controlled by an electric transmission control device. The system including several pressure control valves, actuated electrically by the transmission control device, and several switching valves and pressure regulation valves, actuated by hydraulic pilot pressure, which is adjustable with the pressure control valves. Each shift element is associated with one of the pressure control valve. An engagement prevention valve is actuated by one of a control pressure of the first shift element and a pressure signal equivalent to the control pressure of the first shift element to engage the reverse drive gear. A pressure supply line of the second shift element for obtaining the reversing gear is blocked when the engagement prevention valve is in its first switch position and open when the engagement prevention valve is in its second switch position. | 08-27-2009 |
20090249777 | TRANSMISSION DEVICE WITH AT LEAST ONE FORM-FIT SHIFTING ELEMENT BEING HYDRAULICALLY ACTUATED VIA A HYDRAULIC SYSTEM - A transmission device ( | 10-08-2009 |
20090250310 | TRANSMISSION APPARATUS COMPRISING AT LEAST ONE POSITIVE SHIFTING ELEMENT HYDRAULICALLY ACTUATED BY WAY OF A HYDRAULIC SYSTEM - A transmission apparatus ( | 10-08-2009 |
20100042302 | METHOD FOR THE EMERGENCY ACTUATION OF AN AUTOMATED DOUBLE CLUTCH TRANSMISSION OF A MOTOR VEHICLE - A method for emergency actuation of an automated dual-clutch transmission of a vehicle with electrohydraulic control via a transmission control device. The method includes disengaging one clutch of the dual-clutch transmission, in order to realize emergency operation of the transmission and applying pressure on the other clutch after an error signal is transmitted indicating a malfunction of the transmission and/or the transmission control device. In order to keep the complexity of the hardware of the hydraulic system low, both clutches are disengaged, when an error signal occurs, and adjusted to a safe initial state, and an actuating pressure is only re-applied to one of the two clutches after the initial state is reached. In addition to the already existing elements of the hydraulic system, only one device or software is required which detects and selects the clutch that is more advantageous for continued driving operation. | 02-18-2010 |
20100081543 | VALVE ARRANGEMENT IN A HYDRAULIC CONTROL UNIT - A pressure (p | 04-01-2010 |
20100093490 | DEVICE FOR THE CONTROL AT LEAST OF A HYDRAULICALLY OPERABLE SWITCHING ELEMENT OF AN AUTOMATIC TRANSMISSION - A device for controlling a hydraulically operable switching element ( | 04-15-2010 |
20100125023 | TRANSMISSION DEVICE WITH A HYDRAULIC SYSTEM COMPRISING A TRANSMISSION MAIN PUMP APPARATUS - A transmission device ( | 05-20-2010 |
20100204893 | PROCESS FOR MONITORING THE DIRECTION OF FRICTIONAL DRIVE FROM A VEHICLE TRANSMISSION AT NEAR-ZERO VEHICLE SPEED - A process of monitoring a drive direction of an automatic or automated vehicle transmission at near-zero vehicle speed via an engaged gear. A desired direction of drive of the transmission is determined from an engaged gear at the time the vehicle begins motion. An actual direction of drive is determined from the transmission and, if different from the desired direction of drive, an error signal is produced. The process includes determining the actual drive either from a sensed rotational direction of a transmission input shaft and a sensed rotational direction of a transmission output shaft or a sensed valve setting, a sensed pressure in an transmission electro-hydraulic control system or on a transmission shifting element or from a sensed direction of rotation of a transmission gearset element or from axial movement or force of a transmission constructional element. | 08-12-2010 |
20100216597 | HYDRAULIC SYSTEM OF A GEAR BOX - An automatic vehicle transmission comprises a first oil supply unit ( | 08-26-2010 |
20100326543 | PRESSURE CONTROL VALVE - A pressure control valve for at least one of controlling and/or regulating a pressure level in a hydraulic circuit. The control valve comprises a valve housing ( | 12-30-2010 |
20110027105 | OIL PUMP FOR AN AUTOMATIC TRANSMISSION AND CONTROL METHOD THERETO - A transmission oil pump for an automatic transmission of a motor vehicle. The speed of the oil pump can be shifted by a transmission ( | 02-03-2011 |
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 |
20110198190 | PARKING LOCK SYSTEM - A vehicle transmission parking lock system comprising a parking lock for locking or releasing the transmission, an operating device of the vehicle which is electrically connected to the parking lock, a spring for engaging the parking lock, a pressure-controlled release device for disengaging the parking lock, a holding device for securing the parking lock in a released and/or engaged condition, and an emergency release device of the parking lock. When the vehicle drive assembly is static due to the occurrence of a defined event, the emergency release device actuates a device to release the parking lock under pressure control. The holding device retains the parking lock in the released condition for as long as the emergency release device is activated, and the defined event which triggers actuation of the pressure-controlled release device of the parking lock occurs when at least two operating devices are actuated in a defined manner. | 08-18-2011 |
20110263382 | METHOD FOR THE OPERATION OF A TRANSMISSION DEVICE - A method is described for the operation of a transmission device ( | 10-27-2011 |
20110275478 | OPERATION METHOD FOR AT LEAST ONE FORM-LOCKING SHIFTING ELEMENT OF AN AUTOMATIC TRANSMISSION BEFORE START-UP OF AN COMBUSTION ENGINE - A method of operating at least one form-locking shifting element of an automatic transmission integrated in a drivetrain which comprises an oil pump that can be driven mechanically by an internal combustion engine and an auxiliary oil pump that can be electrically driven, before start-up of the internal combustion engine. The method including the steps of recognizing the start-up of the combustion engine and, when a start-up of the combustion engine is recognized, controlling the electrically driven auxiliary oil pump and the at least one form-locking shifting element such that, directly after the generation of a defined rotational speed difference of the at least one form-locking shifting element by the internal combustion engine, the at least one form-locking shifting element is engaged. | 11-10-2011 |
20120011842 | HYDRAULIC TRANSMISSION CONTROL - A hydraulic transmission unit comprises at least one pressure regulation valve ( | 01-19-2012 |
20120039726 | METHOD FOR OPERATING A HYDRAULIC APPARATUS OF A TRANSMISSION DEVICE - A method for operating a hydraulic device ( | 02-16-2012 |
20120083374 | ARRANGEMENT COMPRISING AT LEAST ONE DOG CLUTCH - An arrangement which comprises at least one claw clutch that can be connected to at least one component of a transmission, such that the claw clutch is arranged substantially within a bearing support ( | 04-05-2012 |
20120135838 | METHOD FOR OPERATING A TRANSMISSION DEVICE OF A VEHICLE DRIVETRAIN - A method of operating a transmission of a vehicle drive-train that comprises frictional shifting elements and an interlocking shifting element. In the neutral operating condition of the transmission, and in the case of an operating condition variation of the vehicle drive-train in which, when it is required to establish the force flow in the transmission, the interlocking shifting element is to be changed from a disengaged to an engaged operating condition, by increasing the transmission capacities of at least two frictional shifting elements which have to be engaged for producing the force flow, a rotational speed difference in the area of the interlocking shifting element is determined, and a drive torque of a drive machine is adjusted to a level that brings the speed difference within a predefined range at which the interlocking shifting element is approximately synchronized and can therefore be engaged. | 05-31-2012 |
20120186376 | TRANSMISSION DEVICE AND METHOD FOR OPERATING A TRANSMISSION DEVICE - A transmission device has at least one electro-hydraulic transmission control unit and a method of operating the transmission device having a plurality of gear wheel that can be engaged and disengaged from a force flow by fluidically actuated shifting elements. A piston space of a first shifting element, delimited by a second functional surface of the actuating piston of the first shifting element, is made separate from a piston space of a second shifting element, delimited by the first functional surface of the actuating piston, and an area of the second shifting element, that carries an actuating pressure, or an area of the first shifting element, that carries an actuating pressure, is, or can be, connected to the piston space delimited by the second functional surface of the actuating piston of the first shifting element. | 07-26-2012 |
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 |
20120273318 | METHOD FOR DETERMINING CHARACTERISTICS OF AN AUTOMATIC TRANSMISSION - A method of determining a fill current value of at least one frictionally engaging shift element of an automatic transmission. The automatic transmission includes a hydrodynamic converter at which a speed ratio arises and an output shaft. In a control sequence, with a stationary output shaft, the speed ratio is influenced by changing a control current, and the fill current value is determined from the progression of the speed ratio arising during the control sequence, in conjunction with the progression of the control current. | 11-01-2012 |
20120278040 | METHOD FOR DETERMINING CHARACTERISTICS OF AN AUTOMATIC TRANSMISSION - A method of determining a fill current value of a converter lock-up clutch of an automatic transmission. The automatic transmission comprises a hydrodynamic converter, at which a speed ratio arises, and an output shaft. In a control sequence with the output shaft being stationary, the speed ratio is influenced by changing the control current, and the fill current value is determined from the progression of the speed ratio arising, during the control sequence, in conjunction with the progression of the control current. | 11-01-2012 |
20120283064 | METHOD FOR OPERATING A TRANSMISSION DEVICE HAVING A PLURALITY OF FRICTION-FIT SHIFT ELEMENTS AND AT LEAST ONE FORM-FIT SHIFT ELEMENT - A method of operating a transmission device ( | 11-08-2012 |
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 |
20120329606 | HYDRAULIC CONTROL SYSTEM FOR ACTUATING A SHIFTING ELEMENT - A hydraulic system for actuating a transmission shifting element that comprises control and shifting valves. A first surface of a valve slide of the control valve is a differential surface between two functional surfaces of the slide that axially bound an area of the slide having a smaller diameter, by which the actuation pressure is adjusted. When the shifting valve is in a second switch position, a total force component acts upon the slide of the control valve which moves the slide such that the actuation pressure is equal to a system pressure. The total force component corresponds at least to the sum of a first force component equivalent to a pressure signal applied to a second surface of the slide of the control valve and a second force component equivalent to an actuation pressure applied to the first surface of the slide of the control valve. | 12-27-2012 |
20130025396 | HYDRAULIC SYSTEM FOR ACTUATING AT LEAST ONE SHIFTING ELEMENT OF A TRANSMISSION - A hydraulic system ( | 01-31-2013 |
20130035205 | METHOD FOR OPERATING A VEHICLE DRIVE TRAIN HAVING A DRIVING MACHINE AND HAVING A TRANSMISSION APPARATUS HAVING A PLURALITY OF SHIFT ELEMENTS - A method of operating a vehicle drive train having a drive machine, a transmission apparatus having a plurality of shift elements and an output drive. The plurality of shift elements are engaged or disengaged in a power flow for achieving different transmission ratios within the transmission apparatus. The output drive is coupled to a transmission output shaft and the drive machine is coupled to a transmission input shaft of the transmission apparatus. Upon a request to interrupt power flow within the transmission apparatus, between the transmission input shaft and the transmission output shaft, a maximum number of shift elements are transferred to and/or held in an engaged operating state, and the remaining portion of the shift elements are transferred to and/or held in a disengaged operating state with the transmission output shaft being rotatable. | 02-07-2013 |
20130047739 | DEVICE FOR DETERMINING AN OPERATING STATE OF AT LEAST ONE BIDIRECTIONALLY ACTUABLE HYDRAULIC ADJUSTING DEVICE OF A SHIFTING ELEMENT OF A TRANSMISSION DEVICE - A device for determining an operating state of a bi-directionally actuated hydraulic adjusting device of a transmission shifting element, which pressurizes active surfaces of a piston. The piston is biased to opposite end positions depending on which of a first active surface or a second active surface is pressurized with high pressure. The areas of the adjusting device, which can be pressurized with the pressure at the active surfaces of the piston, are connected with one another in positions of the piston element, between the end positions, via a throttle device. One of each area can be coupled for adjustment of the piston with the high-pressure area, and the other area with the low pressure area. An additional throttle device is provided upstream of the low pressure area and a pressure measuring device is provided upstream of the additional throttle device. | 02-28-2013 |
20130099147 | VALVE DEVICE WITH A VALVE HOUSING HAVING MULTIPLE SHIFT TONGUES - A valve device which comprises a valve housing having a plurality of shifting tongues and a valve slide that can move longitudinally in the valve housing. The valve slide is made with diameter sections which co-operate with the shifting tongues depending on an axial position of the valve slide. At least one of the diameter sections is made with at least one, at least approximately groove-like recess that extends in the circumferential direction of the valve slide. The groove-like recesses are functionally connected to an axial bore extending in the valve slide essentially in the axial direction, by way of at least one radial bore extending at least approximately in the radial direction in the valve slide. | 04-25-2013 |
20130174722 | HYDRAULICAL SHIFTING DEVICE FOR AN AUTOMATIC TRANSMISSION - A hydraulic shifting device for an automatic transmission for engaging and disengaging a parking lock. The shifting device comprises a parking lock cylinder ( | 07-11-2013 |
20130196818 | METHOD FOR CHECKING AN EMERGENCY CONDITION IN A TRANSMISSION SYSTEM - A method of monitoring an emergency condition in an automatic transmission, with which, by comparing a theoretical with an actual rotational speed, measured on the transmission input side, overlap of the activated emergency condition, with a gear engagement process called for during the normal condition, is prevented. | 08-01-2013 |
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 |
20150040549 | Method and Control Device to Operate a Component of a Vehicle - Method for the operation of an assembly of a vehicle, whereas the assembly is transferable from an unactuated position into an actuated position by a pressure medium-actuated actuator, if two redundant pressure medium valves both occupy a pressure supply position, whereas, for the functional test of one of the redundant pressure medium valves, a first pressure medium valve is controlled in such a manner that the same occupies the pressure supply position, whereas a second pressure medium valve is controlled in such a manner that the same does not occupy the pressure supply position, and whereas if, upon this control of the two pressure medium valves at the pressure medium-actuated actuator or at the assembly to be operated by the pressure medium-actuated actuator, no reaction is detected, there is a closing at a proper second pressure medium valve, whereas if, despite this control of the two pressure medium valves at the pressure medium-actuated actuator or at the assembly to be operated by the pressure medium-actuated actuator, a reaction is detected, there is a closing at a defective second pressure medium valve. | 02-12-2015 |