Patent ID: 6438953
Filing Date: 2002-08-27
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; correction factor calculation means for calculating for each operating member a correction factor for correcting the control input of the operating member in accordance with the differential pressure detected by the differential pressure detection means; setting means for setting for each operating member a lower limit value of the correction factor in accordance with the control input of the operating member; and control input correction means for correcting the control input of a corresponding operating member, using a correction factor of which at least a lower limit is limited, so that the correction factor calculated by the correction factor calculation means does not exceed the set upper limit value and lower limit value.