Method of and apparatus for alleviating shift shocks of automati

Details Method of and apparatus for alleviating shift shocks of automati Method of and apparatus for alleviating shift shocks of automati

1985-02-25

1988-05-10

Gruber, Felix D.

Boots, shoes, and leggings

74866, B60K 4108, G06F 1520, G05D 1702

Patent

active

047440317

ABSTRACT:
A method of and an apparatus for alleviating shocks occurring during a gear shift of an automatic transmission are disclosed. In order to alleviate shift shocks, the output torque of the engine is reduced upon the lapse of a delay time from the occurrence of a shift command and before the interruption of lock-up action of the torque converter. This delay time is updated using a factor determined by substracting a predetermined constant from a length of time from the occurrence of the shift command to an instant when an actual engine revolution speed agrees with a value of an estimated engine revolution speed variation during the interruption of lock-up action. The engine revolution variation is estimated based on an actual engine revolution speed variation trend taking place immediately after the occurrence of the shift command but before the interruption of lock-up action. The delay time updated in this manner is used during a gear shifting operation initiated by a subsequent shift command.

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