Abstract: A device for operating a shifting element of a drive mechanism, having a piston positioned in a piston space to slide between first and second end positions. The piston is operated hydraulically and depends on the hydraulic pressure in the piston space and a force of a resetting mechanism acting on the piston, which opposes the activating force that is equivalent to the hydraulic pressure in the piston space. The transmission capacity of the shifting element is reduced by a force acting on the piston in the direction of the first end position and is increased by a force acting on the piston in the direction of its second end position. The piston is held by a mechanical holder against a force acting on the piston in the direction of the first end position in at least one preset position which is different from the first end position.

Abstract: A device for operating a shifting element of a drive mechanism, having a piston positioned in a piston space to slide between first and second end positions. The piston is operated hydraulically and depends on the hydraulic pressure in the piston space and a force of a resetting mechanism acting on the piston, which opposes the activating force that is equivalent to the hydraulic pressure in the piston space. The transmission capacity of the shifting element is reduced by a force acting on the piston in the direction of the first end position and is increased by a force acting on the piston in the direction of its second end position. The piston is held by a mechanical holder against a force acting on the piston in the direction of the first end position in at least one preset position which is different from the first end position.

Abstract: An electrical plug-in connection for an automatic transmission of a motor vehicle, consisting of a socket (6, 16) and a plug part engaging therein, for transmitting signals required for control of an electrohydraulic control device (10, 20) with the signals received from a signal source situated outside the transmission. The socket (6, 16) is inserted in the oil pan (1, 11) of the transmission and an electrical contact, via a connection (8, 18), automatically results when the oil pan (1, 11) and the transmission housing are assembly and an automatic electric disconnection results when they are disassembled from one another.

Abstract: A transmission/engine control (1) for a motor vehicle with an automatic transmission (2) having a warning apparatus (3) for a disturbance of a signal transmission from an electrical position recognition apparatus (4) of a selection lever (5) which acts on the regulating device of the automatic transmission, via an electronic transmission control. The warning apparatus (3) has the purpose of notifying the driver that no further change in the direction of travel can be executed and the warning apparatus (3) coacts with a program module of a transmission independent processing unit (6) which, upon occurrence of the disturbance of the signal transmission, initiates an emergency operating mode of the automatic transmission (2) and determines a vehicle speed which is less than a specified threshold value. The processing unit (6) communicates a maximum allowable motor torque and/or a maximal allowable motor speed of rotation to a program module of a motor control (7).

Abstract: An electro-hydraulic control system with electronic control for a gearbox includes at least one actuator element device for receiving an analog measuring signal from the actuator element(s), a device for forming an actual actuator value from the analog measuring signal for the regulation of the actuator element(s), a computing device with a memory, and an output driver. At least one A/D converter is provided to convert the actual analog actuator element value (U1) and/or the analog actuator element measuring value into a digital value. A digital two-step controller regulates the actuator element(s) by a cyclically-called comparison of theoretical and actual values.

Abstract: A digital two-step controller for an actuator element includes an A/D converter, an output driver and a control device with a memory. An analog measuring signal is received from the actuator, converted in the A/D converter into an actual digital value, and is input into a first region of the memory of the control device. The actual digital value which is input into the first region of the memory is compared with a theoretical digital value for the actuator, which value is stored in a second region. The output of the control device to the output driver is set to ZERO when the actual digital value is larger or equal to the theoretical digital value. The output of the control device to the output driver is set to ONE when the theoretical digital value is greater than the actual digital value. After a sampling period &Dgr;t, another analog measuring signal is received from the actuator and the regulation steps are repeated in an interrupt called in cycles and corresponding to the sampling interval.

Abstract: A method and apparatus for the operation of a vehicle with a plurality of electric motors includes an electric motor assigned to each wheel of an axle of the vehicle. Attached to each of the electric motors is a shiftable transmission (at least two-speeds). Shifting of a transmission is performed as a function of the total efficiency of the particular motor when reaching a predetermined shifting point. The transmissions attached to the electric motors are shifted, delayed in time. The shifting of the transmission attached to a first electric motor is monitored and the shifting of a transmission attached to a second motor is performed only when the shifting of the first transmission is completed. No interruption of the traction force occurs in the drive system.