Hydraulic pressure control apparatus

Details Hydraulic pressure control apparatus Hydraulic pressure control apparatus

2007-05-29

2010-12-14

Lorence, Richard M. (Department: 3655)

192 clutches and power-stop control

Transmission control and clutch control

Common control

C192S003610, C192S048601, C192S085630, C060S459000

Reexamination Certificate

active

07849986

ABSTRACT:
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.

REFERENCES:
patent: 4380278 (1983-04-01), Lasken
patent: 5062050 (1991-10-01), Petzold et al.
patent: S58-150602 (1983-10-01), None
patent: H03-134365 (1991-06-01), None
patent: 2002-310282 (2002-10-01), None
patent: 2006-046542 (2006-02-01), None
patent: 2006134647 (2006-05-01), None
patent: 2007-270937 (2007-10-01), None
An English translation of the Office Action of corresponding Japanese Application No. 2006-156826, dated Aug. 17, 2010.

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