Control system for a hydraulic retarder

摘要

A control system includes a hydraulic pump that is driven by the output shaft of the vehicle transmission. A plurality of valve members control the inlet and outlet fluid flow of the pump so that during vehicle braking, a hydraulic retarder is supplied by the pump with hydraulic fluid drawn from a reservoir. When vehicle braking is not requested, the pump inlet is connected to the retarder to evacuate and lubricate the interior thereof.