Method of clutch pressure regulation during downshift of a...

Details Method of clutch pressure regulation during downshift of a... Method of clutch pressure regulation during downshift of a...

2006-05-23

2009-10-13

Pang, Roger L (Department: 3655)

Interrelated power delivery controls, including engine control

Transmission control

With clutch control

C477S176000

Reexamination Certificate

active

07601094

ABSTRACT:
A method for maintaining a fuel cut function in a vehicle wherein, depending on the rate of vehicle deceleration, the pressure upon the lock-up and shift clutches associated with the vehicle's automatic transmission is changed accordingly. This is unlike prior practice, where a fixed pressure was applied to the lock-up and shift clutches at all deceleration rates. In the present invention, if the rate of deceleration is small, the pressure applied to the shift and lock-up clutches is low; there is no increase of the applied pressures. If the rate of deceleration is moderate, the pressure on the lock-up and shift clutches is moderately increased. If the rate of deceleration is high, there is no increase of the applied pressures. Further, if the rate of deceleration is high, the lock-up clutch is completely disengaged.

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patent: 6719664 (2004-04-01), Ito et al.

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