Hydraulic control apparatus for an automatic transmission

Interrelated power delivery controls – including engine control – Transmission control – Transmission controlled by engine

Reexamination Certificate

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Details

C477S906000, C475S123000

Reexamination Certificate

active

07628729

ABSTRACT:
A hydraulic control apparatus, provided with a manual shift valve that outputs a forward range pressure and a reverse range pressure, and a linear solenoid valve that outputs an engagement pressure to the hydraulic servo that engages during reverse travel when energized, includes a fourth clutch relay valve that is interposed between the linear solenoid valve and the hydraulic servo. The fourth clutch relay valve communicates an engagement pressure of the linear solenoid valve to the hydraulic servo by locking in the normal position when a signal pressure of the solenoid valve is input, and communicates a reverse range pressure to the hydraulic servo by being switched to a fail position by the reverse range pressure during a failure in which the fourth clutch relay valve is de-energized. Thereby, it is possible to establish a reverse speed during a failure in which the solenoid valve is de-energized.

REFERENCES:
patent: 4351206 (1982-09-01), Lemieux et al.
patent: 5749802 (1998-05-01), Tanahashi et al.
patent: 6319165 (2001-11-01), Itou et al.
patent: 6475113 (2002-11-01), Suzuki et al.
patent: 6478707 (2002-11-01), Jang
patent: 2003/0040389 (2003-02-01), Kim et al.
patent: 8-42681 (1996-02-01), None
patent: 09-014425 (1997-01-01), None
patent: 09-014430 (1997-01-01), None
patent: 09-303547 (1997-11-01), None
PCT International Search Report (PCT/JP 2006/321210).

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