Clutch system

A clutch system for producing and interrupting a force flow between an engine and a transmission of a motor vehicle, with a clutch (2) normally being in a disengaged operating condition unless actuated and being actuatable by way of one of a pneumatically or a hydraulically pressurizable clutch actuator (1) into an engaged operating condition, and with at least one valve being arranged in a pressure line system of a control valve arrangement (16) for regulating a volume flow of pressure medium and being electrically actuatable by an electronic control and regulation unit (5),

• wherein the at least one valve (3a, 3a′, 3b;
• 4a, 4a′, 4b;
• 9, 10) is designed such that if a failure of the voltage supply and consequently a failure of actuation of the at least one valve (3a, 3b;
• 4a, 4b;
• 9, 10) by the electronic control and regulation system (5), a currently set operating condition of the clutch (2), existing at a time of the failure, remains and is maintained so that if the voltage supply fails during driving and with a gearshift system inactive with a gear is engaged, transmission of full torque or a defined portion thereof is ensured, and if the voltage supply fails when the motor vehicle is at rest, the engine is running and a transmission gear is engaged, an unintended engagement of the clutch is prevented;
• and
• the valves (3a, 3a′, 3b;
• 4a, 4a′, 4b) for filling and emptying the clutch actuator (1) are 2/2-way valves.

A clutch system for controlling a flow of force between an engine and a transmission of a motor vehicle, the clutch system comprising:

• a clutch (2), arranged outside of the transmission and between the engine and the transmission, which is disengaged when un-actuated and engaged when actuated;
• a clutch actuator (1) being pressurized by one of a pneumatic or a hydraulic pressure medium for actuating the clutch (2);
• at least one valve (3a, 3a′, 3b;
• 4a, 4a′, 4b;
• 9;
• 10) being arranged in a pressure line system of a control valve arrangement (16) and regulating a flow of the pneumatic or the hydraulic pressure medium, within the pressure line system, to the clutch actuator (1), and the at least one valve (3a, 3a′, 3b;
• 4a, 4a′, 4b;
• 9;
• 10) being actuated electrically by an electronic control and regulation unit (5);
• and
• the at least one valve (3a, 3a′, 3b;
• 4a, 4a′, 4b;
• 9;
• 10) always retaining engagement of the clutch (2) during a failure of voltage supply, if immediately before failure of the voltage supply the clutch is engaged, the motor vehicle is driving and a transmission gear is engaged, such that the clutch (2) continues transmission of at least a portion of torque being transmitted at a time failure of voltage supply, and the at least one valve (3a, 3a′, 3b;
• 4a, 4a′, 4b;
• 9;
• 10) always preventing engagement of the clutch (2) during the failure of the voltage supply, if immediately before failure of the voltage supply the clutch is disengaged, the motor vehicle is stationary, the engine is running and a transmission gear is engaged.