Fail safe valve for automatic power transmissions

Details Fail safe valve for automatic power transmissions Fail safe valve for automatic power transmissions

1997-10-15

1999-08-24

Ta, Khoi Q.

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477906, F16H 6126

Patent

active

059417943

ABSTRACT:
A hydraulic control system for an automatic transmission, including a hydrualic pressure source, a hydrualic pressure regulator, a transmission mode selector, a shifting controller for automatically controlling shifting between transmission speeds in a given transmission mode, and a hydrualic pressure control mechanism for controlling quality and responsiveness of the shifting between transmission speeds. The hydrualic control system includes a fail safe valve for assuredly maintaining a certain transmission speed (such as third speed) when a transmission control unit (TCU) fails, or when a valve in the control system sticks or becomes inoperative.

REFERENCES:
patent: 4903551 (1990-02-01), Hiramatsu et al.
patent: 5536216 (1996-07-01), Jang
patent: 5611749 (1997-03-01), Jang et al.
patent: 5662550 (1997-09-01), Jang

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