Hydraulic pressure control apparatus and method for...

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

Reexamination Certificate

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C477S162000, C477S906000

Reexamination Certificate

active

06929584

ABSTRACT:
A switching valve is provided which operates hydraulic friction engaging elements in a combination to establish a fifth speed “5th” when in a first position, and in a combination to establish a third speed “3rd” when in a second position, when a first electromagnetic valve to a fifth electromagnetic valve fail so as to stop operating. As a result, in the event of failure while driving, the fifth speed “5th” is first established to enable the vehicle to continue running. Then, when the position of a manual valve is changed by an operation by the driver when the vehicle is stopped or the like, the switching valve shifts a transmission into the third speed “3rd”, which has a larger gear ratio than the fifth speed “5th”, to ensure the driving force required to take off again.

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patent: 6319165 (2001-11-01), Itou et al.
patent: 6432015 (2002-08-01), Takahashi
patent: 6537180 (2003-03-01), Kim et al.
patent: 6634991 (2003-10-01), Itou et al.
patent: 2001/0014638 (2001-08-01), Suzuki et al.
patent: 406207670 (1994-07-01), None
patent: 2000-170899 (2000-06-01), None
patent: 2000-240776 (2000-09-01), None

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