Patent ID: 9206798
Filing Date: 2015-12-08
Classification: E02F,F04B

Abstract:
1. A hydraulic pump control apparatus of a construction machine, comprising: a pump control unit for controlling a discharge pressure of a hydraulic pump driven by an engine, wherein the pump control unit is programmed with: a pressure setting value calculating unit configured to calculate a pressure setting value based on an engine output torque estimating value or an engine RPM; and a breakdown treating unit configured to receive both of the pressure setting value and a pressure command value and to select one of the pressure setting value and the pressure command value depending on whether a swash plate angle sensor is providing a signal or is in breakdown and is not providing a signal, to output the selected value, wherein the pressure command value is calculated based on a calculated flow rate difference value which is a difference value between a pump discharge flow rate and a manipulation unit requiring flow rate.