Hydraulic control apparatus and hydraulic control method for...

Details Hydraulic control apparatus and hydraulic control method for... Hydraulic control apparatus and hydraulic control method for...

2008-07-01

2008-07-01

Wright, Dirk (Department: 3681)

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

Reexamination Certificate

active

07393299

ABSTRACT:
At a first forward speed, the oil passage in a relay valve is switched to control the torque capacity of a lock-up clutch using a linear solenoid valve that controls the engagement pressure of a clutch that is engaged at each of fifth to eighth forward speeds. At each of second to eighth forward speeds, the oil passage in another relay valve is switched to control the torque capacity of the lock-up clutch using a linear solenoid valve that controls the engagement pressure of a brake that is engaged at the first forward speed.

REFERENCES:
patent: 5611750 (1997-03-01), Kono et al.
patent: 5620390 (1997-04-01), Kono et al.
patent: 2000-249219 (2000-09-01), None
patent: 2001-248725 (2001-09-01), None

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