| 摘要 |
An automated transmission system has a hydraulic circuit including an accumulator 124, a control valve 120, actuators 22, 114 and 115 to control a clutch 14 and/or gear engagement mechanism 110-113 and an electric pump 123 for recharging the accumulator 124. Electronic controller 36 controls valve 120 actuation to supply pressurised fluid to the actuators according to system gear change requirements. On powering down of the system following keying-off, the actuators are connected through control valve 120 to drain 12, powering of the pump 123 is inhibited and the control valve 120 is cycled to supply fluid from the accumulator to one or more actuators and from there to drain to reduce pressure in the accumulator 124 to below a predetermined value. Safety checks are made before repressurisation. |
