Patent application number | Description | Published |
20080256942 | Hydraulic system and automatic gearbox - A hydraulic system including a multi-flow hydraulic pressure supply unit, especially a dual-flow hydraulic pressure supply unit, such as a pump, by which a volumetric flow of pressurized fluid is supplied to a hydraulic-fluid-operated device. A valve arrangement is provided either for switching between the individual pump flows or for interconnecting the individual pump flows. | 10-23-2008 |
20090011899 | Method and device for adjusting the friction coefficient of a friction clutch situated in a hybrid power train - A method for adjusting the friction coefficient of a friction clutch situated in a hybrid power train between an electric machine and a combustion engine, actuated by a clutch actuator, the friction coefficient is adjusted by a torque transmitted by the friction clutch, which is determined when starting the combustion engine by the electric machine. | 01-08-2009 |
20090017988 | Method for controlling a starting clutch - A method for actuating a starting clutch in the power train of a hybrid vehicle, where during a starting phase of the combustion engine by means of an electric machine the starting clutch operating between them is engaged in a first starting phase by means of a pre-control and in a second starting phase depending on the acceleration of the crankshaft of the combustion engine. | 01-15-2009 |
20090218190 | CLUTCH SYSTEM - The clutch system relates to an automatic friction clutch with a hydrostatically actuator-controlled clutch withdrawal. In such clutch release systems, a slave cylinder pressurized by a master cylinder in an engaged state is in connection with a reservoir (tank) via a connection opening uncovered by the master cylinder piston. To determine the opening deviations and location of the connection opening, it is proposed that actuation of master cylinder be velocity-dependent and pressure patterns of the hydrostatic clutch release system be evaluated. | 09-03-2009 |
20100145588 | CREEPING PROCESS - A process and apparatus for controlling the creeping process of a motor vehicle. The nominal creeping speed can be adapted. | 06-10-2010 |
20110112738 | PROCESS FOR DETECTING TUNING MEASURES - The invention relates to a process for detecting tuning measures through which the actual output power of an internal combustion engine of a motor vehicle is increased relative to design output power value, whereby, to detect the tuning measures, deviations of actual output power value from a nominal output power value are evaluated, the latter being provided by a control device. | 05-12-2011 |
20120115681 | METHOD FOR CONTROLLING A FRICTION CLUTCH - A method for controlling a friction clutch operatively arranged between a drive unit and a gearbox. The method includes the steps of detecting torque transmitted by the friction clutch, determining a coefficient of friction between friction linings of a clutch disk and antifriction surfaces of the friction clutch, and evaluating the functional capability based on the determined coefficient of friction. In order to avoid an evaluation of a friction clutch that has not yet been broken-in as a worn friction clutch, the evaluation is postponed during a specified breaking-in phase of the friction clutch. | 05-10-2012 |
20120129652 | METHOD FOR CONTROLLING AN INCHING PROCEDURE OF A MOTOR VEHICLE - A method for controlling an inching procedure of a motor vehicle, which has at least one friction clutch arranged between a drive unit and a transmission. The torque of the clutch is specified by a control unit and set by a clutch actuator. If the brake and load lever are not actuated, a multi-stage is started by an torque set by the clutch. To perform the process, the torque is increased up to a specified maximum limit to reach a specified speed in a first stage. A specified time period is waited in a second stage if the specified speed does not reached the maximum limit. The torque is increased by a specified value in a third phase if the specified speed is not reached, and the torque is reduced in a fourth stage and a driver warning is output if the specified speed again is not reached. | 05-24-2012 |
20120160046 | DRIVE TRAIN HAVING CLUTCH ACTIVATION FOR OVERCOMING THE BACKLASH OF THE DRIVE TRAIN BEFORE START-UP - A drive train for a motor vehicle, including a drive unit having a drive shaft and a transmission having a transmission input shaft and a plurality of gears, of which at least one is used as a starting gear for the motor vehicle, and having a friction clutch, which is arranged between the crankshaft and the transmission input shaft and is actuated in an automated manner. In order to prevent start-up noise caused by backlashes in the motor vehicle, a backlash present in the transmission is compensated by applying a small compensating torque set at the friction clutch to the transmission input shaft while the starting gear is engaged before start up. | 06-28-2012 |
20130312556 | METHOD FOR OPERATING AN AUTOMATED DUAL-CLUTCH TRANSMISSION - A method for operating an automated dual-clutch transmission having two sub-transmissions, with which shafts are associated, which transmit a/no torque as active/inactive shafts when a sub-clutch is engaged/disengaged and a gear is engaged/disengaged, the size and direction of said torque being dependent on the particular gear that is engaged, wherein even gears are associated with an even shaft and odd gears are associated with an odd shaft. When an odd/even gear is engaged, that is, when the odd/even shaft is active, a gear is also initially engaged on the inactive even/odd shaft, in order to change a critical resonance slip speed. | 11-28-2013 |
20150060230 | METHOD FOR REDUCING CHATTER VIBRATIONS IN A DRIVETRAIN - A method is provided for reducing chatter vibrations in a motor vehicle drivetrain having a drive unit, a vehicle transmission and an automated friction clutch, wherein a vibration absorber is emulated by an appropriate operation of the friction clutch in order to improve the method. | 03-05-2015 |