METHOD AND DEVICE FOR CONTROLLING HYDRAULIC PUMP FOR WORKING MACHINE OF WORKING VEHICLE TO SENSE EXCAVATION OPERATION STATE WITH OPERATION POSITION DETECTING DEVICE

摘要

PURPOSE: A method and a device for controlling a hydraulic pump for a working machine of a working vehicle are provided to reduce the loss of power by exactly detecting an excavation operation state. CONSTITUTION: In a working vehicle comprising cylinders(13,15) for operating a working machine and a hydraulic pump(26) for feeding the predetermined pressure oil to the cylinder, a method for controlling the hydraulic pump for the working machine is composed of steps for deciding an excavation operation starting if the hydraulic pressure at the bottom side of the cylinder is over a predetermined value after a predetermined time while the hydraulic pressure of the bottom side of the cylinder is below the value; setting to reduce the capacity of the hydraulic pump down to the predetermined capacity below maximum capacity; and controlling to decrease the capacity of the hydraulic pump to the predetermined capacity.