Interrelated power delivery controls – including engine control – Transmission control – Transmission controlled by engine
Patent
1995-05-31
1997-10-28
Marmor, Charles A.
Interrelated power delivery controls, including engine control
Transmission control
Transmission controlled by engine
477906, F16H 6126
Patent
active
056812418
ABSTRACT:
A hydraulic control system for an automatic transmission of an automotive vehicle is provided which has a fail-safe function of preventing unsafe operation of the automatic transmission if a failure occurs in any of solenoid valves which control engagement operations of frictional elements such as clutches and brakes of the transmission. The hydraulic control system includes a hydraulic pressure flow control unit which controls hydraulic pressure flow between at least one of the frictional elements and at least one of the solenoid valves to allow the hydraulic pressure to be supplied to a predetermined combination of the frictional elements to achieve the power transmission at one of given gear ratios. The hydraulic pressure flow control unit restricts the hydraulic pressure flow to an inoperative combination of the frictional elements which provides no power transmission. With these arrangements, the power transmission is established if any of the solenoid valves malfunctions to allow the vehicle to travel.
REFERENCES:
patent: 4519273 (1985-05-01), Shimizu et al.
patent: 4607542 (1986-08-01), Sugano
patent: 5014577 (1991-05-01), Takada et al.
patent: 5085103 (1992-02-01), Ando et al.
patent: 5361651 (1994-11-01), Wakahara
patent: 5556356 (1996-09-01), Hakamada et al.
Ando Yoriaki
Hakamada Naoki
Kubo Kunihiro
Estremsky Sherry Lynn
Marmor Charles A.
Nippon Soken Inc.
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