| 摘要 |
<p>A hydraulic actuation system, eg for a clutch, includes a pressure accumulator 12, a pump 16 being connected between the pressure accumulator 12 and a reservoir 14, the pump 16 pumping fluid from the reservoir 14 to the pressure accumulator 12. Non-return valves 18, 36 being located between the accumulator 12 and pump 16 and between the pump 16 and reservoir 14 to prevent flow of fluid from the accumulator 12 to the pump 16 and from the pump 16 to the reservoir 14 respectively. A solenoid control valve 20, in a first position, connecting the accumulator 12 to a slave cylinder 34 and, in a second position, connecting the slave cylinder 34 to a point between the pump 16 and the non-return valve 36, so that fluid under pressure may be pumped from the slave cylinder 34 directly to the accumulator, thereby reducing the energy consumption of the pump.</p> |
