Mitsubishi Jidosha Kogyo Kabushiki Kaisha

Tetsuo Ikebuchi

Kenjiro Fujita

Katsutoshi Usuki

An automatic transmission control method and apparatus for a vehicle includes a first gear change mechanism in which an input shaft is connected to an output shaft of a fluid coupling and a rotational speed of the output shaft of the first gear change mechanism is changed by selectively controlling hydraulic oil supplied to and discharged from a plurality of first frictional engaging elements. It further includes a second gear change mechanism in which an input shaft is connected to the output shaft of the first gear change mechanism, the output shaft is connected to a driving wheel member and an output shaft rotational speed of the second gear change mechanism is controlled by selectively controlling the hydraulic oil supplied to and discharged from a plurality of second frictional engaging elements. When the first and second gear change mechanisms are operated simultaneously, the rotational speed change rates of the input shaft of the first and second gear change mechanisms are adjusted to predetermined rotational speed change rates by controlling the flow of the hydraulic oil with respect to the first and second plurality of frictional engaging elements.

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Kyoto, Japan

Tetsuo Ikebuchi