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AssigneeAisin Aw Co., Ltd.
InventorsMasaaki Nishida, Hiroshi Tsutsui, Kouichi Kojima, Yutaka Teraoka, Kiyoshi Akutsu
Estimating the term…
An automatic transmission achieves a desired shift through an initial stage shift in which a first engagement element is released and a third engagement element is engaged, and a final stage shift in which a second engagement element is released and a fourth engagement element is engaged. A control apparatus sets an estimated rotation acceleration for a transmission input shaft in accordance with an input torque and an input torque rotation acceleration speed, and controls the release of the second engagement element for moving to the final stage shift according to the estimated rotation acceleration. As a result, it is possible to prevent a shifting delay and/or degradation that occurs between the initial stage and the latter stage by continuous transmission of the input rotation (engine rotation) change when moving from the initial stage to the later stage.
A shift control apparatus for an automatic transmission requiring operation of four engagement elements when shifting from a first shift speed to a second shift speed, and achieving the first shift speed by engaging a first engagement element and a second engagement element, and achieving the second shift speed by engaging a third engagement element and a fourth engagement element, comprising:
Dependencies are inferred from the claim text.