To provide a hydraulic pump control method for controlling a delivery flow rate from a hydraulic pump according to a regenerative flow rate to the hydraulic pump for controlling the delivery flow rate according to an operation quantity of an operator.
When reducing the delivery flow rate Q from the hydraulic pump 1 by a regenerative flow rate, an LS valve 9 is controlled by differential pressure between inlet side pressure and outlet side pressure of an operation valve 4. Or preset pressure of a PC valve 10 is changed and controlled by outputting a control signal to a solenoid valve 13 from a control device. When increasing a work speed of a hydraulic actuator 5, the control signal is inputted to the respective solenoid valves 34 and 13 from the control device to perform control for not changing the delivery flow rate Q from the regenerative flow rate hydraulic pump 1.
MARUTA KAZUHIRO
YOSHIDA NOBUSANE
Katsutoshi Shiozawa
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