Clutch control system for hydraulically operated automotive tran

Details Clutch control system for hydraulically operated automotive tran Clutch control system for hydraulically operated automotive tran

1986-12-04

1988-10-11

Michalsky, Gerald A.

Power plants

Pressure fluid source and motor

Condition responsive control of or by input to input pump...

60468, F16D 3100

Patent

active

047761652

ABSTRACT:
A hydraulically operated automotive transmission on an automobile includes a hydraulic pump coupled to an engine-operated input shaft, a hydraulic motor coupled to a wheel-driving output shaft, a closed hydraulic circuit connected between the hydraulic pump and the hydraulic motor, and a bypass passage connected between the inlet and outlet ports of the hydraulic pump in bypassing relation to the hydraulic motor. A clutch control system combined with the transmission comprises a clutch valve disposed in the bypass passage for selectively opening and closing the bypass passage, and an automatic control device coupled to the clutch valve for controlling the operation of the clutch valve. The automatic control device opens the clutch valve to a first extent which prevents the automobile from creeping while the engine is idling, and closes the clutch valve to a second extent which prevents the engine from racing when the automobile is started.

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