Patent ID: 7607296
Filing Date: 2009-10-27
Classification: E02F,F02D,F04B

Abstract:
1. A hydraulic drive control device of a construction machine comprising an engine and a hydraulic pump for a work machine that is driven by said engine, said device comprising: an operation state detector for detecting an operation state of said work machine; and a controller for receiving a signal from said operation state detector and controlling said engine and said hydraulic pump for said work machine, wherein said controller receives the signal from said operation state detector and identifies an operation mode performed with respect to said work machine; determines an engine output torque control line and a pump torque control line having a desired matching point according to said identified operation mode so that different engine output torque control lines and different pump torque control lines are designated for different operation modes; controls an output torque of said engine based on said determined engine output torque control line; and controls an absorption torque of said hydraulic pump for said work machine based on said determined pump torque control line, wherein said controller determines said engine output torque control line and said pump torque control line so that an engine revolution speed at said matching point of said determined engine output torque control line and said determined pump torque control line assumes a substantially constant predetermined value for any identified operation mode, when said identified operation mode corresponds to any of a plurality of predetermined operation modes.