| 摘要 |
A controller determines whether or not a control valve for controlling the supply of pressure fluid from a main pump to an actuator is at a neutral position, detects input power of a hydraulic motor rotated by return oil from the actuator, and narrows the opening of a proportional electromagnetic throttle valve when the control valve is at the neutral position and the input power of the hydraulic motor is in excess of a first threshold value. |
