HYDRAULIC LIFTER FOR WORKING VEHICELL AND ITS CONTROLLING METHOD

摘要

A hydraulic lifter for a working vehicle and a method for controlling the same are provided to reduce the speed of a lifting frame to the absorption speed at the position where an impact is expected, by controlling a hydraulic circuit connected to a hydraulic cylinder. A hydraulic lifter for a working vehicle includes a hydraulic cylinder(160), a hydraulic circuit(150), and a control unit(120). The hydraulic cylinder having a drive end connected to a lifting frame is installed in the working vehicle. The hydraulic circuit has an ON/OFF solenoid valve for determining the drive direction of the hydraulic cylinder and a proportion solenoid valve for determining the drive speed of the hydraulic cylinder. The control unit moves the lifting frame in a selected direction by controlling the hydraulic circuit and reduces the movement speed of the lifting frame at a predetermined position by controlling the proportion solenoid valve.