Control device and control method for continuously variable transmission
AssigneeAisin Aw Co., Ltd.
InventorsMasachika Kato, Akihiro Kikkawa, Kiyoshi Kurita
Life of this patent
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Abstract
A speed change ECU for a CVT sets a target input rotational speed (Nin*) such that the speed ratio of the CVT is varied stepwise a plurality of times consecutively to the downshift side in response to an operation to depress a brake pedal by a driver, and sets the target input rotational speed (Nin*) such that the time interval between consecutive downshifts becomes longer as the number of times of execution of downshifts is increased on the basis of intershifting times (tint(1)), (tint(2)), . . . while downshifts in which the speed ratio is varied stepwise are executed consecutively.
Claims20
A control device for a continuously variable transmission mounted on a vehicle, the control device controlling the continuously variable transmission such that an input rotational speed of the continuously variable transmission coincides with a target input rotational speed, the control device comprising:
- an electronic control unit that:
- sets the target input rotational speed such that a speed ratio of the continuously variable transmission is varied stepwise a plurality of times consecutively toward a downshift side in response to an operation to depress a brake pedal by a driver, the downshift side being a direction toward a lower gear ratio, and
- sets the target input rotational speed such that an interval between consecutive downshifts becomes longer as the number of times of execution of downshifts is increased while downshifts in which the speed ratio is varied stepwise are executed consecutively.
A control method for a continuously variable transmission mounted on a vehicle, the control method comprising:
- a step of controlling the continuously variable transmission such that an input rotational speed of the continuously variable transmission coincides with a target input rotational speed, and
- a step of setting the target input rotational speed such that a speed ratio of the continuously variable transmission is varied stepwise a plurality of times consecutively to a downshift side in response to an operation to depress a brake pedal by a driver, the target input rotational speed being set such that an interval between consecutive downshifts becomes longer as the number of times of execution of downshifts is increased while downshifts in which the speed ratio is varied stepwise are executed consecutively.
Dependencies are inferred from the claim text.