Double-downshift gear strategy for a dual clutch automatic...

Details Double-downshift gear strategy for a dual clutch automatic... Double-downshift gear strategy for a dual clutch automatic...

2005-03-22

2005-03-22

Lewis, Tisha (Department: 3681)

Interrelated power delivery controls, including engine control

Transmission control

With clutch control

C477S175000, C477S180000, C477S181000

Reexamination Certificate

active

06869382

ABSTRACT:
A method of double-downshifting from a first gear ratio to a second gear ratio includes the steps of first reducing torque transfer from a first clutch to a first driven gear. Engine speed then increases. Next, torque transfer from a second clutch to a third driven gear is increased while simultaneously the first clutch is disengaged from the first driven gear. Torque transfer from the second clutch to the third driven gear is then reduced. Torque transfer from the second clutch to the third driven gear is next increased. The first clutch is engaged to the second driven gear. Then, torque transfer from the first clutch to the second driven gear is increased while simultaneously the torque transfer from the second clutch to the third driven gear is reduced. Finally, the second clutch is disengaged from the third driven gear.

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