| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent the production of idling sound in a hydraulic control valve while efficiently removing a foreign matter by executing back-up control in conjunction with foreign matter removing control at foreign matter removing control. <P>SOLUTION: A control device includes a solenoid valve 2, a switching valve 3 taking solenoid pressure P [SOL] as operating signal pressure of a spool 31 and a foreign matter removing control means for removing the foreign matter in a valve opening/closing part of the solenoid valve 2. The solenoid valve 2 is formed of a first solenoid valve 21 and second solenoid valve 22. The switching valve 3 takes the first solenoid pressure P [SOL1] and second solenoid pressure P [SOL2] as the operating signal pressure. In the foreign matter removing control means, when current for removing the foreign matter is applied to a solenoid coil in one of the first solenoid valve 21 and second solenoid valve 22, the current application in which the solenoid pressure P [SOL] is taken as the maximum pressure area with respect to a solenoid coil of the other is maintained. <P>COPYRIGHT: (C)2009,JPO&INPIT |
