| 摘要 |
The invention relates to a dual-clutch transmission for a vehicle, comprising a hydraulic system for actuating hydraulic cylinders (23) of the clutches (K1, K2) and the shifting elements (22) of the dual-clutch transmission. The hydraulic system has a pressure accumulator (25) for providing an accumulated pressure (ps) in the hydraulic system, and a control valve (35, 37) which can be actuated by a control unit (39) is arranged in each of the pressure lines (31, 33) that are led to the hydraulic cylinders (23) of the first clutch (K1) and the second clutch (K2), wherein the hydraulic pressure applied to the first and second clutch (K1, K2) can be adjusted by means of the control valves. First and second pressure sensors (41, 43) are paired with the control unit (39), and the pressure sensors detect the hydraulic pressure applied to the first and second clutch (K1, K2). The control unit (39) activates a pressure reduction mode when a long idle time of the vehicle is detected, and the accumulated pressure (ps) provided by the pressure accumulator (25) can be reduced in the pressure reduction mode. According to the invention, the control unit (39) continuously opens the control valve (35) paired with the first clutch (K1) in the pressure reduction mode. Additionally, the pressure sensor (41) paired with the first clutch (K1) together with the control unit (39) is integrated into a control circuit (R) in which the first pressure sensor (41) takes over the detection (pactual) of the actual accumulated pressure value. |
