Patent ID: 8393345

Claim:
An oil pressure control device comprising: a first solenoid valve and a second solenoid valve, having pressure regulating valves for regulating pressures of a working fluid supplied thereto in accordance with displacement strokes of valve bodies and outputting the regulated pressures respectively and electromagnetic drive portions for displacing the valve bodies of the pressure regulating valves with forces corresponding to supplied currents respectively; a first control valve that is actuated using a working fluid pressure output from the first solenoid valve as a pilot pressure, and that regulates a pressure of the supplied working fluid in accordance with a supply pressure of the working fluid and the pilot pressure from the first solenoid valve; a second control valve that has input thereto the working fluid pressure regulated by the first control valve as an original pressure and is actuated using a working fluid pressure output from the second solenoid valve as a pilot pressure, and that regulates the pressure of the working fluid at the original pressure in accordance with the pilot pressure from the second solenoid valve and outputting the regulated pressure; and a foreign matter discharge unit that carries out a foreign matter discharge treatment for the first solenoid valve and the second solenoid valve by varying current values of currents supplied to the first solenoid valve and the second solenoid valve respectively in an increasing direction or a decreasing direction and displacing the valve bodies of the respective solenoid valves in a reciprocating manner, wherein: the foreign matter discharge unit carries out the foreign matter discharge treatment for a treatment period composed of a first period in which a current smaller than a predetermined current value is supplied to one of the first solenoid valve and the second solenoid valve and a second period in which a current equal to or larger than the predetermined current value is supplied to the one of the solenoid valves; and the foreign matter discharge unit starts supplying a current equal to or larger than the predetermined current value to the other of the first solenoid valve and the second solenoid valve at a beginning of or during the first period, and starts supplying a current smaller than the predetermined current value to the other of the solenoid valves at a beginning of or during the second period.