Patent ID: 6595336
Filing Date: 2003-07-22
Classification: B60W,F16D,F16H,Y10T

Abstract:
A hydraulic actuation system for an automated transmission system comprising:a hydraulic clutch actuator for controlling engagement of a clutch; a great engagement actuator for controlling engagement of a gear; an accumulator: an electric motor driven pump, an output of the motor driven pump being connected to the accumulator for charging thereof via a non-return valve, the pressure of fluid supplied by the pump being controlled by the current supplied to the electric motor; and a main control valve for selectively connecting the accumulator to the hydraulic clutch actuator and/or the great engagement actuator; wherein the main control valve is movable between: a) a first position in which the clutch actuator is connected to the reservoir and connection of the gear engagement actuator to the accumulator is closed; b) a second position in which the clutch actuator is connected to the reservoir and the gear engagement actuator is connected to the accumulator; c) a third position in which both the clutch actuator and gear engagement actuator are connected to the accumulator; and d) a fourth position in which the clutch actuator is isolated from both the accumulator and the reservoir, and the gear engagement actuator is connected to the accumulator.