Method and apparatus for controlling electromagnetic valve in industrial vehicle

摘要

A method and an apparatus for preventing a solenoid (18) from being heated by an exciting current. When a hydraulic cylinder (12) is permitted to extend and retract, a controller (26) commands a high-side driver (32) to send a moving current to the solenoid (18) such that a valve body of an electromagnetic valve (16) is moved to a connection position. Subsequently, the controller (26) commands the high side driver (32) to send a maintaining current to the solenoid (18) such that the valve body (160) is maintained at the connection position. The moving current and the maintaining current are pulse waves. The duty ratio of the maintaining current is smaller than that of the moving current. <IMAGE>