Hydraulic controller for automatic transmission use

Details Hydraulic controller for automatic transmission use Hydraulic controller for automatic transmission use

1997-01-08

1999-02-02

Marmor, Charles A.

Interrelated power delivery controls, including engine control

Transmission control

Including fluid drive

192 33, B60K 4122, F16H 6144

Patent

active

058657045

ABSTRACT:
To provide a hydraulic controller for automatic transmission use which commonalizes a lockup control valve and a friction engagement element control valve, thereby simplifying a hydraulic circuit, reducing the number of parts, and achieving low cost, a lockup solenoid to control engagement or release of a lockup clutch, a first friction engagement element to engage an friction engagement element only in a portion or entirety of a shifting stage to prohibit lockup, and a manual shift lever to determine whether a vehicle exists in a lockup prohibition condition are provided. A switching valve selectively switches the lockup solenoid to either communicate with the lockup clutch or communicate with the foregoing first friction engagement element. The manual shift valve is disposed in a path extending from the switching valve to the first friction engagement element.

REFERENCES:
patent: 3719093 (1973-03-01), Edmonds
patent: 4843920 (1989-07-01), Hayasaki et al.
patent: 4876923 (1989-10-01), Crandall et al.
patent: 4996894 (1991-03-01), Holbrook et al.
patent: 5085103 (1992-02-01), Ando et al.
patent: 5090271 (1992-02-01), Hayasaki

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