Abstract: A method and apparatus for controlling transmission functions in a transmission of a motor vehicle by an electromagnetically actuated control valve. The control valve is controlled by a control device that includes a stored valve characteristic curve to provide a temperature-dependent and a target-current-dependent overlay, so that a symmetrical target value oscillation around a target current value is achieved. The characteristic curve for controlling the control valve is adapted at least partially as a function of a current value and a temperature.

Abstract: A method for actuating a hydraulic servo system with a proportional valve that converts an electrical control signal into a hydraulic pilot pressure with which the hydraulic servo system is actuated. An additional impulse is fed to the proportional valve at the beginning of a desired change of the electrical control signal.

Abstract: A hydraulic system for controlling a motor vehicle transmission having automated actuation of clutches. The hydraulic system includes a first valve connected downstream from a hydraulic energy source for producing a system pressure to control and/or regulate a clutch pressure. A second valve is connected downstream from the first valve and ahead of two clutches of the motor vehicle transmission to control and/or regulate the clutch pressure, wherein the second valve includes a regulating circuit to regulate the clutch pressure.

Abstract: The invention relates to a hydraulic system for controlling a vehicle transmission with automated actuation of clutches of a motor vehicle, having: a first valve connected downline from a hydraulic energy source for producing a system pressure to control and/or regulate a clutch pressure, a second valve connected downline from the first valve and ahead of two clutches of the vehicle transmission with automated actuation of clutches to control and/or regulate the clutch pressure. In order to provide an improved hydraulic system, the latter has a regulating circuit to regulate the clutch pressure.

Abstract: A method for actuating a hydraulic servo system with a proportional valve that converts an electrical control signal into a hydraulic pilot pressure with which the hydraulic servo system is actuated. An additional impulse is fed to the proportional valve at the beginning of a desired change of the electrical control signal.

Abstract: A method and apparatus for controlling transmission functions in a transmission of a motor vehicle by an electromagnetically actuated control valve. The control valve is controlled by a control device that includes a stored valve characteristic curve to provide a temperature-dependent and a target-current-dependent overlay, so that a symmetrical target value oscillation around a target current value is achieved. The characteristic curve for controlling the control valve is adapted at least partially as a function of a current value and a temperature.

Abstract: A method and apparatus for controlling the cooling of a clutch and for switching a safety function of the clutch of a motor vehicle through a pilot pressure controlled by an electrically operated pilot valve. A coolant valve and a safety valve are controlled as a function of an electric current that operates the pilot valve to provide a pilot pressure to the valves. At least one switching point of the safety valve that is associated with a predetermined value of the electric current is adjusted depending on the electrohydraulic system. The electric current is controlled by a control unit.