Abstract: A method for altering the coupling torque of a coupling in the drive train of a vehicle with an automatic gearbox and/or automatic coupling in a creep drive mode of a vehicle. According to the invention, the coupling torque is altered according to at least one variable, the parameter of the vehicle describing the creep drive mode thereof.

Abstract: A transmission system including a shift mechanism for operating and controlling the transmission system. To automatically detect geometric characteristic values of the transmission system or of the shifting device a selector motor and a shift motor actuate a selector finger that is displaceably mounted in a selection-shift-passageway layout. Starting from an initial position whose coordinates within the selection-shift-passageway layout are unknown, the selector finger is displaced in the directions of shifting and in the directions of selection in order to detect paths of movement in the direction of selection or shifting. The selector finger is repeatedly displaced to establish the maximum paths of movement until the predetermined transmission geometric characteristic values are completely detected. Also disclosed are a control device for controlling a transmission system that includes a shift mechanism, and a method for controlling such a transmission system.

Abstract: A method for altering the coupling torque of a coupling in the drive train of a vehicle with an automatic gearbox and/or automatic coupling in a creep drive mode of a vehicle. According to the invention, the coupling torque is altered according to at least one variable, the parameter of the vehicle describing the creep drive mode thereof.

Abstract: A belt-driven conical-pulley transmission having a pair of conical disks on a power input side and carried on an input shaft, and a pair of conical disks on an output side of the transmission and carried on an output shaft, each pair of conical disks including an axially fixed disk and an axially movable disk. An endless torque-transmitting means extends around and is in contact with the input side disks and the output side disks for transmitting torque between the pairs of disks. The transmission is optimized to minimize noise emitted by the transmission when it is in operation.

Abstract: In a motor vehicle transmission, gears representing different transmission ratios are engaged by applying a force to an actuator output element that couples a selected gear to a rotary shaft. A synchronizing device blocks the coupling of the gear to the shaft until at least an approximate synchronization of rpm-rates has been achieved. A synchronization threshold position corresponding to the blocked condition of the actuator element is stored in a memory of a controller device. The controller device periodically performs an automatic adaptation of the stored value for the synchronization threshold position.

Abstract: The initial rotational speed of a conical disc flexible drive transmission is determined by measuring a wheel rotational speed and the gear ratio and by calculating the initial rotational speed therefrom. In order to ascertain the slipping of a CVT transmission, the rate of change in the ratio is drawn upon or an acoustic parameter of the transmission is used. In the fluid control system, a valve is used whose opening cross-section is controlled according to the one differential pressure. In order to oil the conical discs, injection holes of a injection tube are used that passes through a slot provided in a slide rail resting against a side of a flexible drive means of a conical disc flexible drive means.

Abstract: A power-branched transmission having a steplessly adjustable transmission ratio. An input-side distributor transmission includes an input gear that is nonrotatably connected with an input shaft coupled to an engine. The power-branched transmission includes an output shaft and two clutches. The input gear of the distributor transmission is rotatably coupled with an input shaft of a variable speed drive unit. An output gear of the distributor transmission is rotatably engaged with an intermediate shaft that is arranged in a functionally parallel manner relative to the variable speed drive unit and is rotatably engaged with an output shaft of the variable speed drive unit. The intermediate shaft is operatively coupled with the output shaft through a first clutch and the input shaft of the variable speed drive unit is operatively coupled with the output shaft through a second clutch.

Abstract: The invention relates to a hydraulic system comprising a multi-flow, especially dual-flow, hydraulic pressure supply unit, such as a pump, by which means a volume flow is supplied to a consumer. The invention is characterised in that a valve arrangement is provided for switching between the individual pump flows and/or for interconnecting the individual pump flows.

Abstract: A method for regulating or controlling the transmission ratio of an automatic power-branched transmission. Power is transmitted through a shaft driven by an engine, a variable speed drive, a gear transmission, a driven shaft, and at least two control clutches. The variable speed drive and the gear transmission are connected to each other in such a way that the regulating range of the variable speed drive is traversed in one direction within a first range of transmission ratios, and is traversed in the opposite direction within a second range of transmission ratios during traversing of the entire range of transmission ratios. The shifting strategies result in reduced wear of the endless belt device and allow for comfortable changing between the transmission ratio ranges.

Abstract: A branched power transmission whose transmission ratio is continuously variable and that includes two planetary transmissions, each having a sun gear, a planet gear, and a ring gear, and a speed change mechanism having a pair of driven shafts. One gear of the first planetary transmission is non-rotatably connected with an input shaft and provides a rotational connection between the input shaft and the driven shafts of the speed change mechanism. One gear of the second planetary transmission is non-rotatably connected with an output shaft and provides a rotational connection between the output shaft and the driven shafts of the speed change mechanism.

Abstract: A method and a system for reducing a jerk produced by the range shift of a transmission with a power division arrangement. The transmission includes a variable speed drive in the form of a continuously variable transmission, and a pair of planetary gear sets and a pair of shift clutches to enable power to be divided between two branches within the transmission. During a range shift between two operating ranges the variable speed drive is acted upon by a short-term transmission ratio adjustment impulse in such a way that a cancellation jerk caused thereby the adjustment impulse weakens the jerk caused by the range shift.

Abstract: A method of controlling a motor vehicle with an automated clutch is provided and includes the steps of: (a) detecting the vehicle speed, (b) detecting if the brake and/or the gas pedal is actuated, (c) detecting whether or not the engine is running, (d) disengaging the clutch if the engine is found to be running while the vehicle is found to be moving faster than a threshold speed, and if at the same time neither the brake nor the gas pedal is found to be actuated, and (e) subsequently re-engaging the clutch if the brake and/or gas pedal is found to be actuated. Prior to re-engaging the clutch, a transmission input rpm-rate is determined, and an engine rpm-rate is controlled in such a manner that that the respective rpm-rates of the engine and the transmission are brought towards a closer agreement.

Abstract: A method for controlling a transmission of a vehicle, especially an automated transmission and/or an automated clutch. A starting characteristic curve is used to adjust a nominal torque of the clutch, the characteristic curve is modified in order to adapt to different operating states of the vehicle, in such a way that the desire of the driver is taken into account when the vehicle is brought into motion.

Abstract: Specific shift positions of an electrically actuated vehicle transmission, such as first to fifth, neutral and reverse gears, are detected by monitoring one or more characteristic electrical variables, e.g., actuator currents, during a shift movement of the transmission and by correlating increased or decreased levels of current with the arrival at or passage through the specific shift positions.

Abstract: A method of controlling an automated transmission of a motor vehicle, wherein the degree of accelerator-pedal depression is expressed as a pedal-depression value and a gear-shifting strategy is determined based on one or more shift characteristics, includes the steps of: determining the pedal-depression value and/or the amount of torque demanded by the driver, evaluating the shift characteristics by taking the pedal-depression value and/or driver-demanded torque into account as input quantities for the evaluation, and determining the gear-shifting strategy based on the evaluation.

Abstract: In a method and apparatus for diagnosing a malfunction in a clutch actuator of a motor vehicle, the actual position of the clutch actuator is measured by a position sensor. Simultaneously, an estimated position of the clutch actuator is calculated by an emulation unit that emulates the function of the clutch actuator. Malfunctions of the clutch-actuator are diagnosed by comparing the actual, measured position to the estimated position.

Abstract: In a vehicle with a gear-shift transmission of a kind that requires a torque-free state to shift gears, the riding comfort is improved by a method of shifting gears where a gear shift is preceded by the steps of: reducing the vehicle acceleration at a time t1 from an existing level (1) to a first acceleration level (3), maintaining the vehicle acceleration at the reduced level (3) for a predetermined time interval, and at the end point t3 of the predetermined time interval, reducing the acceleration further to a second acceleration level that is lower than the first level.

Abstract: A device for an automatic clutch in motor vehicles, provided with hydraulic transmitter pickup actuator arrangements and a compensation system for a hydraulic fluid. In a cylinder, a modulation limit of a piston is defined, whereby the piston cup thereof in said position comes to rest outside an opening of the compensation system disposed in the wall of the cylinder.

Abstract: A branched power transmission with several transmission ratio ranges with a steplessly adjustable transmission ratio includes a drive shaft (2) that is connected to both shafts (14, 16) of a variable speed unit (4) through a distributor transmission (12), which shafts in turn are connected with the input shafts (18, 20) of a parallel gearbox (20) through respective clutches (K13, K2R). Two transmission ratio ranges only differ from each other through the transmission ratio of an input shaft of the parallel gearbox and its output shaft. Additionally, the power-producing transmission can include an electrical machine (61).

Abstract: The comfort level gear shift motor vehicle with an automated gear-shifting transmission is determined by shift parameters, which are dependent on driving parameters and on a shift program mode. The shift program mode identified through a characteristic parameter, which can vary a range of parameter values corresponding to a range of shift program modes. The method has the steps of detecting current values the driving parameters, detecting a current value of the characteristic parameter, determining respective minimum and maximum values that each of said shift parameters can assume within the range of characteristic parameter values as a function of the current driving parameter values, calculating actual shift parameter values as intermediate values between said maximum and minimum values for each of said shift parameters based on said current value of the characteristic parameter, and performing the gear shift with the actual shift parameter values.