Automatic transmission having torque converter with lockup...

Details Automatic transmission having torque converter with lockup... Automatic transmission having torque converter with lockup...

2008-04-29

2008-04-29

To, Tuan C (Department: 3663)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Transmission control

C701S067000, C477S175000, C477S169000, C477S115000, C192S1030FA

Reexamination Certificate

active

10699674

ABSTRACT:
When a downshift instruction has been detected, the oil pressure of a lookup clutch is controlled, and the state of operation of the automatic transmission is detected. If a starting condition has been met, a slip rotation speed of the lockup clutch is calculated, and if the calculated slip rotation speed is greater than or equal to a reference rotation speed, the calculated slip rotation speed is set as a target slip rotation speed. If a condition for converging the target slip rotation speed has been met, the target slip rotation speed is then converged to a steady target rotation speed.

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