Patent attributes
The hydraulic pressure control apparatus includes an upstream control valve, a downstream control valve, a hydraulic pressure sensor, and a controller. The upstream control valve is provided between a hydraulic pressure source and a hydraulic pressure device. The downstream control valve is disposed between the upstream control valve and the hydraulic pressure device. The hydraulic pressure sensor is configured and arranged to detect the hydraulic pressure on a downstream side of the downstream control valve. The controller is 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 is 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 is set to be equal to or greater than the upstream pressure command value.
