Importance

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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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First Claim