Abstract: An assembly (10) forming part of a regenerative drive system for a motor lorry. The motor lorry has a driven train that is operatively associated with the assembly (10) so as to cause operation of the assembly (10) to store energy, or alternatively to be driven by the assembly (10) by depletion of energy stored by the assembly (10). The assembly (10) includes a variable angled swash plate pump/motor (11) that is drivingly associated with the drive train and the motor lorry. The assembly (10) includes a clutch (13) that is engaged when the motor lorry is de-accelerating, to cause the pump/motor (11) to be driven.

Abstract: An assembly (10) forming part of a regenerative drive system for a motor lorry. The motor lorry has a driven train that is operatively associated with the assembly (10) so as to cause operation of the assembly (10) to store energy, or alternatively to be driven by the assembly (10) by depletion of energy stored by the assembly (10). The assembly (10) includes a variable angled swash plate pump/motor (11) that is drivingly associated with the drive train and the motor lorry. The assembly (10) includes a clutch (13) that is engaged when the motor lorry is de-accelerating, to cause the pump/motor (11) to be driven.

Abstract: A drive assembly (10) for a regenerative drive system (11) that incorporates a pump/motor (12) and an electronic and a hydraulic control system (13). When incorporated in a motor lorry, and the motor lorry is de-accelerating a second clutch part (20) of the assembly (10) is engaged with a first clutch part (19) to thereby drive the pump/motor (12). The pump/motor (12) is rendered inoperative by operation of a clutch (18).

Abstract: The hydraulic regenerative drive system for a vehicle includes an electronic controller, a hydraulic control circuit that receives control signals from the electronic controller, a reservoir in fluid communication with the hydraulic control circuit, a pump/motor unit having a controlled-angle swash plate element providing variable displacement, an accumulator in fluid communication with the hydraulic control circuit and a pump/motor unit speed sensor and pump/motor unit pressure sensor providing measured speed and measured pressure signals to the electronic controller. The electronic controller generates a torque signal and a modified engine throttle signal on the basis of a mathematical model, converts the torque signal to a swash plate angle, and controls a controlled-torque retard mode of operation and a controlled torque propulsion mode of operation.