Hydraulic control system having swing motor energy recovery

摘要

A hydraulic control system is disclosed for use with a machine. The hydraulic control system may have a tank, a pump, a swing motor, and at least one control. The hydraulic control system may further have an accumulator configured to receive fluid from and supply fluid to the swing motor, a charge valve movable to allow fluid flow from the swing motor into the accumulator, and a discharge valve movable to allow fluid flow from the accumulator to the swing motor. The hydraulic control system may additionally have a controller in communication with the at least one control valve, the charge valve, and the discharge valve. The controller may be configured to detect an acceleration of the swing motor, selectively cause the discharge valve to assist the acceleration, and selectively move the charge valve to an open position to recover energy associated with pressure spikes occurring during the acceleration.

主权项

1. A hydraulic control system, comprising:
a tank; a pump configured to draw fluid from the tank and pressurize the fluid; a swing motor driven by a flow of pressurized fluid from the pump; at least one control valve configured to control fluid flow between the pump, the swing motor, and the tank; an accumulator configured to selectively receive pressurized fluid discharged from the swing motor and selectively supply pressurized fluid to the swing motor; a charge valve movable from a closed position to an open position to selectively allow fluid flow from the swing motor into the accumulator; a discharge valve movable from a closed position to an open position to selectively allow fluid flow from the accumulator to the swing motor; and a controller in communication with the at least one control valve, the charge valve, and the discharge valve, the controller being configured to:
detect an acceleration of the swing motor;selectively cause the discharge valve to assist the acceleration;selectively move the charge valve to an open position to recover energy associated with pressure spikes occurring during the acceleration;make a comparison of a pressure of the accumulator with a minimum threshold pressure; andselectively move the charge valve to a closed position during acceleration based on the comparison.