Lock-up clutch slip control for an automatic transmission

Details Lock-up clutch slip control for an automatic transmission Lock-up clutch slip control for an automatic transmission

1996-02-29

1997-08-05

Wright, Dirk

Interrelated power delivery controls, including engine control

Clutch control

Condition responsive control

477169, F16H 6114

Patent

active

056536615

ABSTRACT:
A slip control apparatus provides a smooth response of actual slippage amount during a transitional period when a lock-up clutch is shifting from a disengaged state to a slipping state, and quickly determines a response to external disturbances when the slipping of the clutch is in a steady state. The apparatus has a first control unit for outputting a first control value based on the difference between target slippage amount and actual slippage amount, a second control unit for outputting a second control value based on the actual slippage amount, and a clutch pressure regulating unit for controlling an electromagnetic valve to control a lockup system on the basis of the sum of the first and second control values. The first control unit performs control for the transitional state of the lock-up clutch between the disengaged state and the slipping state. The second control unit performs control in response to external disturbances when the slipping of the clutch has reached the steady state via the transitional state.

REFERENCES:
patent: 4466311 (1984-08-01), Hiramatsu
patent: 4468988 (1984-09-01), Hiramatsu
patent: 5531302 (1996-07-01), Koenig et al.

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