Patent application number | Description | Published |
20100094513 | METHOD FOR STARTING CONTROL UNIT OF A MOTOR VEHICLE - In order to achieve a comfortable starting process with low wear, a braking torque, set by the driver by way of a brake pedal, an acceleration torque, requested by the driver via the accelerator pedal, and a holding torque, required for holding a motor vehicle on a gradient, are determined, and the engagement of the starting clutch, as well as the release of the service brake, are coordinated such that during the release of the service brake, the sum of the clutch torque and braking torque corresponds to the holding torque, and the clutch torque of the starting clutch is increased by the acceleration torque only when the service brake has been largely released. | 04-15-2010 |
20100113220 | METHOD FOR OPERATING A DRIVE TRAIN - The invention relates to a method for operating an automotive drive train comprising at least one automatic transmission and one drive unit. According to said method, a starting speed is determined during starting of the motor vehicle, a starting process being triggered using the determined starting speed by closing a starting element, especially a starting clutch. According to the invention, the starting speed can be individually adjusted by a driver in such a manner that when the automatic transmission is in the selector position neutral, the engine speed of the drive unit can be determined by the driver by actuating the gas pedal and that once the automatic transmission is transferred from neutral to a selector position corresponding to forward gear or reverse gear the engine speed of the drive unit prevailing during the transfer is used as the starting speed. | 05-06-2010 |
20100121545 | METHOD FOR OPERATING A TRANSMISSION - The invention relates to a method for operating a transmission, especially an automatic transmission, comprising a dry starting clutch. Said starting clutch is especially configured as a friction clutch and a characteristic value is determined during operation in defined operating points, said value being indicative of the state of wear of the starting clutch. The method according to the invention is characterized by comparing a newly determined characteristic value with a characteristic value previously determined in a previous operating point. If the newly determined characteristic value deviates from the previously determined characteristic value to such an extent that it suggests a reduced wear of the starting clutch, it is assumed that the starting clutch has been replaced and a wear indicator of the starting clutch is reset in a defined manner. | 05-13-2010 |
20100198469 | CONTROLLER FOR AUTOMATED VARIABLE-SPEED TRANSMISSION IN A MOTOR VEHICLE WITH ALL-WHEEL DRIVE - A method of controlling an automated variable-speed transmission in a drivetrain of a motor vehicle having all-wheel drive in which, during driving operation under difficult ground conditions, measures are provided for suppression of the automatic shift processes. To reliably prevent undesired automatic shift processes when the vehicle is in an all-wheel drive mode on difficult terrain, particularly also in combination with active differential locks, currently active traction-related mechanisms are evaluated by a plausibility check taking into account detection of wheel slippage, and the measures for suppressing automatic shift processes are carried out as a function of the evaluation. | 08-05-2010 |
20100204007 | METHOD FOR CONTROLLING AN AUTOMATIC TRANSMISSION OF A MOTOR VEHICLE - A method of controlling an automatic transmission of a vehicle in which a hold gear function is activated by a driver request and is deactivated independently of a return condition. To allow an effective, safe to operate, and comfortable use, the return condition depends on one of the following criteria or a useful combination of the same: a flexible time span, consideration of the vehicle stand still time; a rotational speed of the vehicle engine, or one or several parameters which correlate with the engine rotational speed, a new, the same, or a different drive request by the driver, a change in the operating condition of the vehicle, and a plausibility check occurring during the startup procedure. | 08-12-2010 |
20100318268 | METHOD FOR CONTROLLING THE COMPRESSED AIR SUPPLY OF AN INTERNAL COMBUSION ENGINE AND TRANSMISSION - A method to operate a vehicle drive train comprising a combustion engine, a turbo charger assigned to the combustion engine, a mechanism for injecting additional compressed air into an air intake system of the combustion engine and a transmission. The method enables practical use of a compressed air injection mechanism, in the drive train, and comprises the step of controlling the time, the duration, the pressure and/or the volume of the additional compressed air, to be injected into the air intake system of the combustion engine, depending upon the performance request of the driver, the actual rotational speed and load condition of the combustion engine, the speed of the vehicle, and the procedures of the gear ratio change of the transmission. | 12-16-2010 |
20100331143 | METHOD FOR CONTROLLING A COMPRESSED AIR SUPPLY OF AN INTERNAL COMBUSTION ENGINE DURING A STARTING PROCESS - A method of operating a vehicle drive train ( | 12-30-2010 |
20110219900 | METHOD FOR RUNNING A DRIVE LINE - A method of operating a powertrain may include providing an automatic transmission disposed between a drive unit and an axle drive. One input shaft of the automatic transmission is connected by means of an operable clutch to the drive unit and an output shaft of the automatic transmission is connected to the axle drive. A transmission-side, mobile auxiliary drive is configured to couple with a transmission-side connection. The transmission-side connection point for the auxiliary drive is decoupled from the axle drive and, at least partially from the drive unit. The rotational rate of the transmission-side connection point for the auxiliary drive and the auxiliary drive are synchronized, whereby the auxiliary drive is coupled to the connection point. The transmission-side connection point for the auxiliary drive, and thereby the auxiliary drive, is coupled to the drive unit as well as the axle drive. | 09-15-2011 |
20110224855 | METHOD FOR RUNNING A DRIVE LINE - A method for operating a powertrain of a motor vehicle may comprise: providing a powertrain comprising an automatic transmission arranged between a drive unit and an axle drive, wherein an input shaft of the automatic transmission is connected with the drive unit by means of a controllable clutch and an output shaft is connected with the axle drive, and wherein the powertrain comprises also a gearbox-sided, transient auxiliary drive that is selectively connected for activating or engaging a gearbox-sided connecting point or disconnected for deactivating or disengaging from the connecting point; determining, when the gearbox-sided transient auxiliary output is activated or engaged, a load to be borne at the performance of a gearshift; and specifying, depending on the determined load, whether the gearshift is going to be performed and what synchronous elements of the powertrain are being used to perform the gearshift. | 09-15-2011 |
20110237393 | METHOD FOR CONTROLLING AN AUTOMATED GEARED TRANSMISSION - A method of controlling an automated stepped transmission disposed in a drive train of a motor vehicle in conjunction with a turbo-charged internal combustion engine. In which the control of start-up and shifting procedures depends on the response behavior of the internal combustion engine. In order to enable control of the start-up and shifting processes with considerably lower coordination effort, the actual response behavior of the internal combustion engine is taken from an engine dynamics characteristic map in which the immediately available maximum torque (M | 09-29-2011 |
20110259679 | METHOD FOR PROVIDING ASSISTANCE TO A DRIVER OF A VEHICLE DURING A STARTING PROCESS - In the method for providing assistance to the driver of a motor vehicle, in particular a motor vehicle comprising a semi-automatic or an automatic transmission, it is recognized, during the starting process, whether the holding torque of the vehicle is greater than the engine intake torque in the current gear. In the event that a current torque is greater than the engine intake torque in the current gear or if no gear is engaged or called for, in the first forward gear, emitting a signal which indicates to the driver the need to use the holding brake of the vehicle and/or a transmitting a signal to the brake control system of the vehicle to impose a brake pressure in the service brake and/or in the holding brake. | 10-27-2011 |
20130040779 | GEARSHIFT CONTROL METHOD FOR A MOTOR VEHICLE - A gearshift control method for a motor vehicle whose drive train comprises a turbo-charged combustion engine, a startup clutch and a shift clutch and an automatic stepped transmission, in which drive engine torque deficiencies, that occur during the build-up of load at the end of a tractive upshift, are avoided without assisting the engine with an additional device or increasing the charge pressure. The method provides that the engine accelerates at the earliest, after the disengagement of the load gear, and at the latest, at the start of the load build-up after the engagement of the target gear up to the boost threshold speed or an engine speed which is slightly above the boost threshold speed, and is loaded, during the load build-up, with a largely constant engine speed beyond the intake torque of the engine to nearly the full load torque, before slipping of the friction clutch ends. | 02-14-2013 |
20130040780 | METHOD FOR CONTROLLING THE STARTING OF A MOTOR VEHICLE - A method for startup control of a motor vehicle whose drive train comprises a drive engine built as a turbo-charged internal combustion engine, an automated friction clutch, and an automatic stepped transmission, with a startup which is triggered by the activation of the gas pedal from the stationary state, after engagement of a determined startup gear. The driven engine, in conjunction with coordinated engagement of the friction clutch, is controlled from the idle speed to a startup speed and from the idle torque to a determined startup torque. To reduce the load on the friction clutch, the method provides that the lowest possible engine speed, which can be generated spontaneously under load from the idle speed depending on the dynamic operating characteristics of the drive engine and with which the drive engine can generate the determined startup torque, is determined and set as the startup speed. | 02-14-2013 |
20130040781 | METHOD FOR DETERMINING A STARTING SPEED IN A MOTOR VEHICLE - A method for determining a startup gear in a motor vehicle for starting from standstill while maintaining a load limit of the clutch in a the drive train which comprises a drive engine built as an internal combustion engine, a friction clutch, and an automatic stepped transmission. To avoid overloading the clutch, the method determines a load-independent startup gear with which startup would occur under the present starting conditions without considering the current load state of the clutch and without complying with a load limit of the clutch. A load-specific startup gear is determined as the highest startup gear, with which during a startup under the present starting conditions, a predefined load limit of the clutch would be maintained with consideration given to the present load state of the clutch. The startup gear is the lowest of the load-independent startup gear and the at least one load-specific startup gear. | 02-14-2013 |
20130041562 | METHOD FOR CONTROLLING THE LOCOMOTION OF A MOTOR VEHICLE - A method for drive control of a motor vehicle in a drive train which comprises a drive engine built as a turbo-charged internal combustion engine, a startup and shifting clutch built as an automated friction clutch, and a transmission built as an automatic stepped transmission. The method overcomes drive engine torque deficiencies while traveling in which such torque deficiencies occur when the driver demands power corresponding to a target torque of the drive engine which is above the spontaneously attainable maximum torque. To avoid downshifting or starting from standstill, initially the clutch is disengaged up to slipping operation, the drive engine is then accelerated to the boost threshold speed or an engine speed which is slightly above the boost threshold speed, and the drive engine is then loaded up to substantially the full load torque with a substantially constant engine speed before the slipping operation of the clutch ends. | 02-14-2013 |
20130190134 | METHOD FOR ADAPTING A CHARACTERISTIC CURVE OF CLUTCHES IN A PARTIAL DOUBLE-CLUTCH TRANSMISSION OF A MOTOR VEHICLE - A method of adapting the characteristic curve of clutches in a partial dual-clutch transmission of a vehicle, for example a utility vehicle, having a first partial transmission in the form of a dual-clutch transmission (DKG) having a dual clutch (DK) that includes a first clutch (K | 07-25-2013 |
20130197769 | METHOD FOR CONTROLLING SHIFTS IN A VEHICLE TRANSMISSION - A method of controlling shifts in a vehicle transmission, for example a utility vehicle, having a transmission or partial transmission designed as a dual-clutch transmission that shifts as a without traction force interruption. The transmission comprises a dual clutch having a first clutch and a second clutch that are functionally connected to a drive engine, and a transmission or partial transmission comprises a main transmission that shifts with traction force interruption and is connected to a drive-train downstream from the dual-clutch transmission. During shifts in the main transmission that is connected downstream from the dual-clutch transmission, the dual clutch is operated, by pre-loading the two clutches, as a transmission brake and/or an engine brake for adapting the speed of components to be shifted so as to enable short shifting times and ensure comfortable and reliable driving operation. | 08-01-2013 |
20130203555 | METHOD FOR CONTROLLING SHIFTING OF A PARTIAL DOUBLE CLUTCH TRANSMISSION - A method of controlling shifting in a transmission having a first partial transmission, designed as a dual-clutch transmission, which comprises first and second clutches by which the dual-clutch transmission can be functionally connected to a turbocharged internal combustion engine. A second partial transmission is arranged in the drive-train, downstream of the dual-clutch transmission, which is in the form of a main transmission that shifts with traction force interruption. To at least reduce traction power loss of the turbocharged engine after a traction shift, during a traction shift involving a gearshift in the main transmission, the clutches are at least partially engaged so as to be braced against one another and produce a torque that acts in opposition to the drive engine by virtue of which, during the traction shift, the supercharge pressure of the drive engine is largely maintained, or at least built up shortly after the traction shift. | 08-08-2013 |
20130298757 | METHOD FOR CONTROLLING AN ACTUATOR - A method of controlling a pneumatic actuator for actuation of a pneumatically actuated device. The actuator comprises a piston and a pneumatic cylinder, the piston is arranged to move axially within the pneumatic cylinder. The piston is moved as a function of a pressure in a pressure chamber of the pneumatic cylinder, and the pressure in the pressure chamber is adjusted by a control unit which controls at least a valve and/or a pressure regulator and/or a pressure generating device. A pilot control component, for the control, is determined as a function of at least a sliding friction force and/or at least a static friction force of the pneumatic actuator. | 11-14-2013 |
20130303332 | METHOD FOR CONTROLLING AN AUTOMATIC TRANSMISSION OF A MOTOR VEHICLE - A method of controlling an automatic transmission of a vehicle in which a hold gear function is activated by a driver request and deactivated depending on a return condition. The method comprises the step of (a) determining the return condition by a change in operating state, and (b) deactivating the hold gear function if a temporary operating state, for which the hold function is requested, ends and a change takes place between one of uphill driving and downhill driving and between driving one of up and down a hill and driving on a same plane. | 11-14-2013 |
20140019020 | METHOD FOR CONTROLLING A GEAR BRAKE FOR AN AUTOMATED CHANGE-SPEED GEARBOX - A method of controlling a transmission brake of an automated change-speed transmission having a control cylinder, that is pressurized by inlet and outlet valves, and an upstream main cut-off valve by which a nominal pressure, supplied to the control cylinder, is regulated. Functional deviations of the transmission brake can be considered during a shifting operation, when the transmission is in neutral, the motor coupling clutch is disengaged and the transmission brake is engaged. The rotational speed gradient and the mass of the transmission components to be braked are determined and used to calculate the current braking torque of the transmission brake. The current braking torque relates to the current regulated nominal pressure, and the determined values are stored in a control unit and used during subsequent actuation of the transmission brake. | 01-16-2014 |
20140020371 | METHOD FOR CONTROLLING AN AUTOMATED TRANSMISSION - A method of controlling an automated transmission for motor vehicles with one or several pressure activated positioning cylinders ( | 01-23-2014 |
20140020494 | METHOD FOR CONTROLLING AN AUTOMATED TRANSMISSION - A method of controlling an automated transmission with positioning cylinders ( | 01-23-2014 |
20140088843 | METHOD FOR ADAPTING SHIFTS IN A MOTOR VEHICLE TRANSMISSION - A method provides for adapting shifts to be carried out in a transmission of a motor vehicle. The shifts are triggered by a transmission control unit and are is controlled and/or governed by the transmission control unit. An actual value corresponding to an acceleration of the motor vehicle is recorded by measuring instruments and is compared to a corresponding target value. On the basis of a deviation between the actual value and the target value, the carrying out of the subsequent shifts of the transmission control unit is adapted. The actual value corresponding to an acceleration of the motor vehicle is individually recorded for several consecutive shift stages of each shift, whereas the actual value in the individual shift stages is compared to the target value in the individual shift stages of the transmission control unit. On the basis of a deviation in the individual shift stages between the actual value and the target value, the carrying out of the subsequent shifts of the transmission control unit is individually adapted for each shift stage. | 03-27-2014 |
20140121912 | METHOD FOR INITIALIZING THE MASS OF A MOTOR VEHICLE - A method of initializing the mass of a motor vehicle, in particular when the motor vehicle is re-started or when it is at rest, for the control of a starting process of the motor vehicle. From measured and/or calculated operating parameters of the motor vehicle, an operating situation of the motor vehicle is determined and, on the basis of the operating situation determined and as a function of operating situation dependent loading and/or unloading patterns, the mass of the motor vehicle is initialized. | 05-01-2014 |
20140171263 | METHOD FOR SHIFT CONTROL OF AN AUTOMATED GROUP GEAR - A method of controlling a shift of an automated group gearbox having a multi-step main transmission and a trailing two-step range group. An input shaft of the main transmission is driven by a drive device. The main transmission and a range group have synchronization devices with shift clutches. Each synchronization device, for the main transmission, has two shift positions for respective gear ratio steps and a neutral position and the range group synchronization device has only two shift positions to shift between two gear ratios steps. To accelerate range shifts, when synchronizing the range group, the main transmission input shaft is synchronized by controlling external synchronization aids to a target rotational speed at which either after the synchronization and shifting of the gear ratio step of the range group or independently from the current synchronization condition of the range group, the target gear ratio is engaged in the main transmission. | 06-19-2014 |
20140309901 | CONTROL DEVICE OF A MOTOR VEHICLE AND METHOD FOR OPERATING SAME - A control device for a motor vehicle such that during a driving direction change from an original direction and/or during a starting process and/or during a stopping process and/or during a rolling process, in order to assist with the driving direction change and/or starting process and/or stopping process and/or rolling process, an appropriate control signal is provided by the control device to automatically activate a service brake. The control device automatically determines the friction energy produced at a starting clutch, during the driving direction change and/or starting process and/or stopping process and/or rolling process, without activation of the service brake. The control device only automatically activates the service brake, to assist with the driving direction change and/or starting process and/or stopping process and/or rolling process, if the determined friction energy exceeds a limit value. | 10-16-2014 |