Mazda Motor Corporation

Hiroshi Monden

Yoshiyuki Shinya

According to the gear shift controlling device of the automatic transmission of the present invention, by using an engine load signal for which decreasing change was tempered, in the case where the actual engine load decreases the working state of engine is prevented from crossing the gear shift line for shift up on a gear shift diagram at the time of deceleration running with an accelerator pedal closed. Therefore, contingent shift up at deceleration running can be prevented and lack of working of the engine brake can be eliminated. In addition, unnecessary shift down following the shift up can be prevented and proper gear shift control according to the running state can be carried out.

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Hiroshima, Japan

Hiroshi Monden