| 摘要 |
PURPOSE:To enable the regular insurance of a necessary excited current as the whole solenoid even if an abnormality is caused in one sub-solenoid by constituting the solenoid of a pressure control valve for changing the working fluid pressure of a fluid pressure cylinder by a plurality of sub-solenoids. CONSTITUTION:In an active type suspension 16, the working fluid pressure supplied to a hydraulic cylinder disposed between a vehicle body side member and each wheel side member is controlled by a pressure control valve 22 installed corresponding to each of the wheels. In this case, the pressure control valve 22 changes the opening area of a communicating hole 61a by regulating the sliding position of a poppet 62 and has a proportional solenoid 63 for regulating the pilot pressure Pp of a pilot room PR formed of two sub-solenoids 63A, 63B. When either of the current sending routes to these sub-solenoids 63A, 63B is fallen into an abnormal state, the excited current in the normal current sending route is compensated and supplied, so that a necessary excited current can be obtained as the whole. |
