Patent ID: 7849986
Filing Date: 2010-12-14
Classification: F15B,F16H

Abstract:
1. A hydraulic pressure control apparatus configured and arranged to control a hydraulic pressure of fluid supplied to a hydraulic pressure device from a hydraulic pressure source, the hydraulic pressure control apparatus comprising: an upstream control valve provided between the hydraulic pressure source and the hydraulic pressure device; a downstream control valve disposed in series with the upstream control valve between the upstream control valve and the hydraulic pressure device; a hydraulic pressure sensor configured and arranged to detect the hydraulic pressure on a downstream side of the downstream control valve; and a controller configured to control the upstream control valve and the downstream control valve based on an upstream pressure command value and a downstream pressure command value, respectively, the controller being further configured to detect an abnormality in the upstream control valve based on the hydraulic pressure detected by the hydraulic pressure sensor when the downstream pressure command value of the downstream control valve is set to be equal to or greater than the upstream pressure command value of the upstream control valve.