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:
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:
An automatic transmission in the form of a belt-driven conical-pulley transmission having conical disk sets on the power input and power output sides, and an endless torque-transmitting member interconnecting the input side and the output side disk sets for transmitting torque therebetween. At least one stop at at least one of the end positions of at least one axially displaceable disk is provided with a cushioned retarding component for minimizing disk impact loads.
Abstract:
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.
Abstract:
A branched power transmission having several transmission ratio ranges with a steplessly adjustable transmission ratio. A drive shaft is connected to both shafts of a variable speed unit through a distributor transmission, which shafts in turn are connected with the input shafts of a parallel gearbox through respective clutches. Two transmission ratio ranges 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. A further embodiment includes a variable speed unit, a first planetary transmission connected with a drive shaft, the input shaft of the variable speed unit and a connecting shaft, and a second planetary transmission that is connected with the connecting shaft of the output shaft of the variable speed unit and an output shaft, and an electrical machine that is non-rotatably connected with the connecting shaft.
Abstract:
In a process which is for controlling and/or regulating an automated clutch, in particular in the drive train of a vehicle, and in which an actuating element, whose position determines the clutch torque transmissible by the clutch, is actuated for setting a predefined clutch torque according to a characteristic curve, the actuating element is actuated according to a characteristic curve which in a first range of the clutch torque specifies the clutch torque as a function of the position of the actuating element and in a second range of the clutch torque specifies the clutch torque as a function of the force applied to the clutch by the actuating element.
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 for controlling the adjustment of a continuously variable transmission in which pairs of conical disks are adjustable relative to each other so that transmission ratios can be set continuously between first and second shafts on which the respective conical disk pairs are positioned. In respective absolute end positions of the adjustable disks the transmission ratio assumes an extreme value. A control system provides that in a first adjustment range the adjustable disks are always kept within relative end positions that are at least at a defined distance from the absolute end positions. In a second operating state, the adjustment of the adjustable disks is controlled in such a way that the adjustable disks can be moved within a second adjustment range over the entire adjustment distance to the absolute end positions, so that in the second operating state a maximum possible spread of the transmission is utilized.