Automatic transmission lockup clutch control apparatus

Details Automatic transmission lockup clutch control apparatus Automatic transmission lockup clutch control apparatus

1993-01-12

1994-03-08

Bonck, Rodney H.

192 clutches and power-stop control

Vortex-flow drive and clutch

With brake

74890, 192 33, 192 331, 192 358, B60K 4128, F16H 4502

Patent

active

052919790

ABSTRACT:
An apparatus for operating a lockup clutch to provide a controlled degree of slip between the impeller and the turbine in an automatic transmission. A gear ratio is calculated from a relationship specifying the gear ratio as a function of selected gear change mode and time elapsed after the selected gear change mode starts. The calculated gear ratio is used, along with the transmission output shaft speed to calculate a speed of rotation of the turbine. The lockup clutch is operated in a slip lockup mode to bring a difference between the engine and turbine speeds to a predetermined value. Engine speed changes are monitored to measure a time interval required for the gear change of the selected mode. The relationship is modified to correct the gear ratio stored for the selected gear change mode based upon the measured time interval.

REFERENCES:
patent: 4825366 (1989-04-01), Yamamoto et al.
patent: 4940122 (1990-07-01), Fujieda

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