Hybrid operating machine

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.

主权项

1. A hybrid operating machine, comprising:
a main pump; an engine which drives the main pump; a variable-capacity assist pump connected to a discharge side of the main pump via a joint passage; a tilting angle controller which controls a tilting angle of the assist pump, a proportional electromagnetic throttle valve provided in the joint passage; an actuator; a control valve which controls a supply of pressure fluid from the main pump to the actuator; a variable-capacity hydraulic motor which is rotated by return oil from the actuator; a motor generator connected to the assist pump and the hydraulic motor; a battery connected to the motor generator; and a controller which is connected to the tilting angle controller and the proportional electromagnetic throttle valve, determines whether or not the control valve is at a neutral position, detects input power of the hydraulic motor rotated by the return oil from the actuator and narrows the opening of the 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.