Morgan & Finnegan, LLP
Method and apparatus for controlling electromagnetic valve in industrial vehicle
 A method and an apparatus for preventing a solenoid from being heated by an exciting current. When a hydraulic cylinder is permitted to extend and retract, a controller commands a high-side driver to send a moving current to the solenoid such that a valve body of an electromagnetic valve is moved to a connection position. Subsequently, the controller commands the high side driver to send a maintaining current to the solenoid such that the valve body 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. 
Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
B B H H B
B60G B60G H01H H01F B60G
additional additional inventional inventional additional
Tadashi Hiroo
Yamada Ito