Hydraulic construction machine prime mover and hydraulic pump control device

摘要

In the present invention, the reference pump flow rate calculator 70a calculates the reference discharge flow rate QR10 by referring to the table stored in the memory, the control pilot pressure PL1 of the hydraulic pump 1 side, The operation unit 70c calculates the target discharge flow rate QR11 by dividing the reference discharge flow rate QR10 by the ratio NRC / NR1 of the target engine speed NR1 to the maximum number of revolutions NRC, The target draft angle R1 is calculated by dividing the target discharge flow rate QR11 by the actual engine speed NE1 and the constant K1 in the solenoid output current calculation section 70G and the target draft angle R1 is obtained from the solenoid output current arithmetic section 70G The driving current SI1 is obtained and outputted to the solenoid control valve 30. As a result, the pump discharge flow rate can be controlled with good response in accordance with the input change of the operation command means.