Select-shock control apparatus and method for vehicular automati

Details Select-shock control apparatus and method for vehicular automati Select-shock control apparatus and method for vehicular automati

1998-05-01

1999-12-28

Wright, Dirk

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

475128, F16H 6108

Patent

active

060074566

ABSTRACT:
In select-shock control apparatus and method for a vehicular automatic transmission, the automatic transmission having a friction element to be released when a range selection from a vehicular running range to a neutral range occurs, a determination is made whether the range selection from the vehicular running range to the neutral range occurs; a transient hydraulic pressure control is performed such that a hydraulic pressure drawn out from the friction element is reduced up to a pressure level such as not to generate a shock which would occur in the vehicle when the range selection occurs, the level of the drawn out hydraulic pressure is maintained for a time duration at an end of which no vehicular running torque is left in the friction element, and, thereafter, an engagement torque developed on the friction element is drawn out at a dash when determining that the range selection from the vehicular running range to the neutral range occurs.

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