Patent ID: 6401456
Filing Date: 2002-06-11
Classification: E02F,F15B

Abstract:
A method of controlling a work machine by inputting electric manipulation signals into function generating units and controlling control valves of a hydraulic circuit that is adapted to drive hydraulic actuators of the work machine based on command values input from said function generating units, wherein said work machine control method includes a process comprising:computing calibration deviations, each of which is computed based on the difference between a command value corresponding to an imaginary start-up moment of a hydraulic actuator, said command value being a provisional value on a reference function that has been set beforehand in the function generating unit corresponding to said hydraulic actuator, and the actual command value stored at the moment when the hydraulic actuator was actually used; setting the corrected functions in the respective function generating units by adding said calibration deviations to the respective reference functions; controlling said control valves based on the command values that have been changed by using the corrected functions; detecting load-sensing pressure at the load side and control valve return pressure generated in a return circuit, which is located closer to the tank than are the control valves; computing a differential pressure between said load-sensing pressure and said control valve return pressure; and computing a calibration deviation based on the difference between the provisional command value on the reference function, said provisional command value corresponding to an imaginary start-up moment of the hydraulic actuator associated therewith, and the command value stored at the moment when the aforementioned differential pressure rose, which moment is regarded as the actual start-up moment of the hydraulic actuator.