Patent ID: 6173573
Filing Date: 2001-01-16
Classification: B60R,F15B

Abstract:
A control device for a hydraulic drive machine which comprises a hydraulic pump, a plurality of hydraulic actuators provided in correspondence with a plurality of operating members, and a plurality of operating valves for supplying to corresponding hydraulic actuators a pressure oil discharged from the hydraulic pump at a flow rate that accords with control inputs of the operating members, and which drives the hydraulic actuators in accordance with the operation of the operating members, characterized in that the control device comprises:differential pressure detection means for detecting for each operating valve a differential pressure between a pressure of the pressure oil flowing into the operating valve and a pressure of the pressure oil flowing out of the operating valve;minimum differential pressure selection means for selecting a minimum differential pressure from among the differential pressures detected by the differential pressure detection means;correction factor calculation means for calculating for each operating member a correction factor for correcting, on the basis of a ratio between the detected differential pressure of the operating valve and the selected minimum differential pressure, a control input of an operating member corresponding to the operating valve; andcontrol input correction means for correcting the control input of a corresponding operating member using the correction factor calculated by the correction factor calculation means.