Patent ID: 9377065
Filing Date: 2016-06-28
CPC Classification: B60T,F16D

Claim Text:
1. A method of operating a hydraulic retarder in a mobile machine including a transmission having a torque converter, the method comprising: when the hydraulic retarder is turned off, when the hydraulic retarder is turned on, moving a retarder-flow valve to a retarder on position in response to a command for operation of the hydraulic retarder, providing fluid from the retarder pump through the retarder-flow valve to the hydraulic retarder when the retarder-flow valve is in the retarder on position, providing fluid from the torque converter through the retarder-flow valve to at least one of the hydraulic retarder, the secondary operation, and the tank, providing a signal indicative of a commanded operating condition of the hydraulic retarder to a solenoid valve, and providing flow through the solenoid valve to the retarder-flow valve to move the retarder-flow valve to the retarder on position in response to the commanded operating condition of the hydraulic retarder.