Abstract: A method and apparatus to save fuel and to make efficient use of the possibilities of a power train including a transmission having a continuously variable transmission ratio. If the vehicle velocity exceeds a prescribed velocity the fuel supply to the engine is shut off, kinetic energy of the vehicle is stored in an energy storage device, and the transmission ratio of the transmission is shifted in the direction of a lower transmission ratio. If those measures are not sufficient the vehicle brakes are operated.

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: 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 target engine rotational speed depending at least upon the position of an accelerator pedal position and a motor vehicle speed is determined in a method for controlling the operation of a motor vehicle drive train having a drive motor and a branched power transmission with several steplessly adjustable transmission ratio regions, between which shifting takes place at a predetermined range shift transmission ratio. A transmission ratio corresponding to the target engine rotational speed and vehicle speed is determined and set, whereby the change with respect to time of the accelerator pedal position and/or the change with respect to time of the target engine rotational speed is used for determining the target engine rotational speed and is filtered when a difference between the actual transmission ratio and a transmission ratio shift range falls below a limit value.

Abstract: A method and apparatus for carrying out a drive belt slippage regulation in a continuously variable transmission. A driving disk set and a driven disk set are connected together for torque transfer by an endless torque-transmitting element in which a power ratio between the driving disk set and the driven disk set of a variable speed drive is set as a function of a safety margin value.

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: Method for adapting a relationship stored in an electronic control unit, between a moment transmittable by a clutch, and a control variable for controlling an actuation unit of the clutch, which clutch is arranged in an automated motor vehicle drive train with a torque detection device arranged between the clutch and a transmission with a steplessly changeable transmission ratio for producing an output parameter dependent upon a detected moment and the momentary transmission ration of the transmission, by which method the moment transmitted by the clutch is calculated from the momentary transmission ratio and the value of the output parameter, and in an operating condition of the clutch in which the transmittable and transmitted moment of the clutch are equalized, the transmitted moment is coordinated with the control variable as an updated transmittable moment.

Abstract: A method and apparatus for controlling a motor vehicle drive train component. The motor vehicle includes an engine control device and a clutch control device. The method and apparatus control the clutch control device and the engine control device so that they do not simultaneously control or regulate the same operating parameter of the drive train.

Abstract: A method and apparatus for regulating the contact force between two frictionally-engaged torque-transmitting components of a motor vehicle drive system. A contact force between an endless torque-transmitting device and a pair of conical disks of a continuously variable transmission is determined by an adjusting value that is a function of a preliminary adjusting value and a regulator output value. The preliminary adjusting value is determined by the value of at least one operating parameter of the drive system, and the regulator output value is determined by comparing the actual value of an operating parameter with a target value of the operating parameter.

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: A target engine rotational speed depending at least upon the position of an accelerator pedal position and a motor vehicle speed is determined in a method for controlling the operation of a motor vehicle drive train having a drive motor and a branched power transmission with several steplessly adjustable transmission ratio regions, between which shifting takes place at a predetermined range shift transmission ratio. A transmission ratio corresponding to the target engine rotational speed and vehicle speed is determined and set, whereby the change with respect to time of the accelerator pedal position and/or the change with respect to time of the target engine rotational speed is used for determining the target engine rotational speed and is filtered when a difference between the actual transmission ratio and a transmission ratio shift range falls below a limit value.

Abstract: A method and apparatus for regulating the transmission ratio of a continuously variable transmission. A set point value for adjusting the transmission ratio can be changed as a function of the operating parameters of a power train that includes the transmission. The set point value is composed of an initial control value and a regulating value. The initial control value depends on at least two operating parameters of the transmission. The set point value is updated to take into account changes that occur during operation of the transmission.

Abstract: A method for controlling a continuously variable transmission that includes a multi-stage torque sensor. At least one switchover point from one stage to another stage is determined based upon a given input load and is correlated with transmission operating parameters, such as transmission ratio, hydraulic pressure within a chamber in the torque sensor, and transmission output torque.

Abstract: Oscillations of a variable quantity, particularly of the rpm rate of an input shaft of a cone-pulley transmission in the power train of a vehicle, are detected by monitoring the rate of change of the variable quantity during time intervals of a predetermined length. The difference between the maximum and minimum levels that the rate of change reaches during the predetermined time period is compared to a threshold reference, and if it is found to exceed the threshold reference, the variable quantity is judged to be in a state of oscillation.

Abstract: A method and apparatus for regulating the transmission ratio of a continuously variable transmission. A set point value for adjusting the transmission ratio can be changed as a function of the operating parameters of a power train that includes the transmission. The set point value is composed of an initial control value and a regulating value. The initial control value depends on at least two operating parameters of the transmission. The set point value is updated to take into account changes that occur during operation of the transmission.

Abstract: A torque-transmitting system such as continuously variable transmission for motor vehicle has an input device and an output device whose operating state can be described in terms of characteristic operating values. The input device and the output device are adjustable in relation to each other by adjusting a ratio between characteristic operating values, which has the result of changing the transmission ratio. An actuator device performs the functions of shifting the positions of the input and output device as well as holding the devices at a set position. A control device controls the actuator device through a control signal. A computing device performs calculations as well as learning and adapting processes involved in setting the value of the control signal.

Abstract: A fluid pressure regulating valve, particularly for an automated clutch in the power train of a motor vehicle with a manually shiftable transmission, is adjustable by an electronic control unit which regulates the strength of alternating current being supplied to one or more electromagnets of the valve. The control unit receives signals from sensors which monitor the fluid pressure, the temperature and/or the RPM of one or more constituents of the motor vehicle, and such signals are processed into signals denoting differences between existing and desired pressures of fluid being supplied to and/or by the valve. These signals are compared with information stored in at least one memory of the control unit and denoting memorized differences between actual and desired current strengths. The memorized signals are altered when a comparison in the control unit indicates that the differences ascertained on the basis of signals transmitted by the sensors depart from differences denoted by the memorized information.

Abstract: The ratio-controlling hydraulic pressure in a continuously variable cone-pulley transmission is regulated by means of a regulating device in such a way that the control parameters of the regulating device are adjusted depending on the amounts of ratio-controlling pressure to be applied and that the regulation is performed by using the adjusted control parameters. The method includes measures for maintaining a set transmission ratio at a continuing constant level.

Abstract: A method of monitoring a torque transmission system with a manually switchable gearbox in the power train of a motor vehicle involves the utilization of at least one sensor unit at the input side of the torque transmission system to ascertain relevant positions of the shift lever of the gearbox and the driving torque of the engine of the motor vehicle. The thus obtained shift lever signals are memorized, together with comparison signals which are obtained as a result of filtering of the shift lever signals, and various characteristics of such signals are recognized and identified to indicate the intention of the operator of the vehicle regarding the switching of the gearbox. The thus obtained switching intention signals are transmitted to a controlled clutch operating system.