A method actuates a hydraulic system for an actuation device of a motor vehicle. The hydraulic system has a pump and multiple valves which are each arranged between a system rail connected to a pump outlet and a hydraulic consumer. The pump is switched between a normal operation and an enhanced operation according to an existing total energy demand of the hydraulic consumers. In normal operation, the pump is driven when the system pressure is below a lower pressure threshold and switched off when the system pressure is above an upper pressure threshold. In the enhanced operation, the pump is permanently driven and each of the valves is operated according to an individual energy demand of the respective hydraulic consumer as soon as the system pressure achieves or exceeds a threshold value.

A method actuates a hydraulic system for an actuation device of a motor vehicle. The hydraulic system has a pump and multiple valves which are each arranged between a system rail connected to a pump outlet and a hydraulic consumer. The pump is switched between a normal operation and an enhanced operation according to an existing total energy demand of the hydraulic consumers. In normal operation, the pump is driven when the system pressure is below a lower pressure threshold and switched off when the system pressure is above an upper pressure threshold. In the enhanced operation, the pump is permanently driven and each of the valves is operated according to an individual energy demand of the respective hydraulic consumer as soon as the system pressure achieves or exceeds a threshold value.

The invention relates to a hydraulic circuit having a first hydraulically actuable clutch that is closed in a rest state and a second hydraulically actuable clutch that is closed in the rest state, wherein the hydraulic circuit is configured in such a way that a hydraulic medium present in a main pressure line can be loaded with a working pressure by a pressure generating device and/or a pressure accumulator, and the hydraulic medium can be discharged for pressure dissipation via a main return line into the return reservoir. In some embodiments, the hydraulic circuit has a first distributor pressure line and a separate, first collector return line for the hydraulic supply of a first part circuit and at least one separate, second distributor pressure line and at least one separate, second collector return line for the hydraulic supply of a second part circuit, and the first clutch is assigned to the first part circuit and the second clutch is assigned to the second part circuit.

The invention relates to a hydraulic circuit (100, 200, 300) having a first, hydraulically actuable clutch (K1) which is closed in a rest state and a second, hydraulically actuable clutch (K2) which is closed in the rest state, wherein the hydraulic circuit (100, 200, 300) is configured in such a way that a hydraulic medium which is present in a main pressure line (HD) can be loaded with a working pressure by means of a pressure generating device (DE) and/or by means of a pressure accumulator (DS), and the hydraulic medium can be discharged for pressure dissipation via a main return line (HR) into the return reservoir (T), and wherein the hydraulic circuit (100, 200, 300) has a first distributor pressure line (VD1) and a separate, first collector return line (SR1) for the hydraulic supply of a first part circuit (TK1) and at least one separate, second distributor pressure line (VD2) and at least one separate, second collector return line (SR2) for the hydraulic supply of a second part circuit (TK2), wherein the first clutch (K1) is assigned to the first part circuit (TK1) and the second clutch (K2) is assigned to the second part circuit (TK2), and wherein, in an operating state of the hydraulic circuit (100, 200, 300), either the first collector return line (SR1) or the second collector return line (SR2) is connected hydraulically to the main pressure line (HD).

A vehicle driveline having a torque transfer device and a fluid circuit for operating the torque transfer device. The fluid circuit has a motor, a pump driven by the motor, an actuator, and a pair of valves. The valves are arranged in the fluid circuit to control fluid circulation within the fluid circuit and can be operated such that fluid pressure in the actuator can be maintained (i.e., to maintain engagement of the torque transfer device) without operating the pump.