| 摘要 |
A hydraulic regenerative drive system for a vehicle is disclosed. An electronic controller ( 28 ) receives a nominal engine throttle signal ( 35 ) and generates a time-variant torque signal ( 26 ) therefrom. A hydraulic control circuit ( 18 ) receives controlling signals ( 15 ) from the electronic controller ( 14 ). A reservoir ( 62 ) is in fluid communication with the hydraulic control circuit ( 18 ) for storing hydraulic fluid. A pump/motor unit ( 60 ) has a controlled element ( 61 ) providing variable displacement, and is in fluid communication with the hydraulic control circuit ( 18 ). The pump/motor unit ( 60 ) is adapted for connection to the drive train ( 12 ) of the vehicle. An accumulator ( 64 ) is in fluid communication with the hydraulic control circuit ( 18 ). The controller ( 28,14 ) controls a controlled-torque retard mode of operation, in which the controlled element ( 61 ) of the pump motor unit ( 60 ) is controlled by the torque signal ( 26 ) to impart a dynamically calculated retarding torque to the drive train ( 12 ), and the pump/motor unit ( 60 ) pumps fluid from said reservoir to the accumulator ( 64 ) via the hydraulic control circuit ( 18 ). The controller ( 28,14 ) also controls a controlled-torque propulsion mode of operation in which the controlled element ( 61 ) is controlled by the torque signal ( 26 ) to impart a dynamically calculated propelling torque to the drive train ( 12 ), and the pump/motor unit ( 60 ) motors under influence of fluid from the accumulator ( 64 ) passing to the reservoir ( 62 ) via the hydraulic control circuit ( 18 ).
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