System for alleviating select shock in automatic transmission

Details System for alleviating select shock in automatic transmission System for alleviating select shock in automatic transmission

1988-10-17

1991-01-29

Bonck, Rodney H.

192 clutches and power-stop control

Transmission control and clutch control

Common control

192 0076, 192109F, 74867, B60K 4122

Patent

active

049879820

ABSTRACT:
In order to shorten considerable time lag, which allows racing of an engine and lowers the transmission output torque peak, an accumulator back-up pressure acting on an accumulator for a start-up friction element is increased momentarily to quickly move a servo piston after a manual selector valve has been shifted from N range position to D range, for example, until the friction element is brought into the intial engagement stage. Subsequently, the accumulated back-up pressure is lowered to soften the frictional engagement.

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"Service Manual No. 578" pub. by Nissan Motor Co., 6/87, pp. C-12 to C-49.

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