Patent ID: 6655135
Filing Date: 2003-12-02
Classification: F04B

Abstract:
A construction machine comprising:an engine; a hydraulic pump actuated by said engine; a hydraulic actuator circuit adapted to use said hydraulic pump as a hydraulic oil source; a pump regulator adapted to control discharge rate of hydraulic oil discharged from said hydraulic pump; an engine speed sensor adapted to detect the number of revolutions of said engine; a temperature detector adapted to detect temperature of the hydraulic oil; and a controller adapted to control the discharge rate of said hydraulic pump through said pump regulator, said controller controlling flow rate of said hydraulic pump in accordance with the number of revolutions of said engine, and in a temperature region where the temperature of the hydraulic oil is lower than a preset temperature, said controller controlling so that the flow rate of the hydraulic pump relative to the number of revolutions becomes smaller than in a case where the temperature of the hydraulic oil is not lower than said preset temperature.