Patent ID: 6874525

Claim:
A control device for controlling a two-way linear solenoid valve comprising a pressure regulating port which communicates with a hydraulic circuit side, a drain port which communicates with a drain side, a plunger which controls the state of communication between the pressure regulating port and drain port, and a coil which drives the plunger in accordance with an exciting current, the control device comprising: a current generator which supplies the coil with the exciting current corresponding to a duty signal; and a microcomputer programmed to: determine whether or not a preset foreign matter removal starting condition for removing foreign matter accumulated in the ports has been established; set a variation pattern for a current command value in the form of a rectangular wave having a preset maximum current command value and a preset minimum current command value, when the foreign matter removal starting condition is established, and subsequently transmit to the current generator a first duty signal corresponding to the maximum current command value and a second duty signal corresponding to the minimum current command value; determine whether or not a preset foreign matter removal completion condition has been established; and terminate the setting of the rectangular wave variation pattern when the foreign matter removal completion condition is established.