Interrelated power delivery controls – including engine control – Transmission control – Transmission controlled by engine
Patent
1994-03-04
1995-11-21
Bonck, Rodney H.
Interrelated power delivery controls, including engine control
Transmission control
Transmission controlled by engine
477 64, 477144, 477149, 477156, F16H 6106
Patent
active
054681987
ABSTRACT:
An electronic transmission coastdown shift control method in which the transmission controller has the capacity to predict timing of apply element application. The control method of the present invention improves the shift sequence by accurately prefilling the apply element. The transmission controller vents the release element when apply element application is imminent and controls the application of the oncoming element to achieve a controlled element exchange for a smooth coastdown shift. A duty cycle is then applied to complete the oncoming element application with a soft yet quick application and control the engagement of the oncoming element. The identification of the application point of the oncoming element enables the apply element fill volume to be learned during coastdown shifts. It also enables the calculation of a line pressure correction factor necessary in accurately predicting application of the apply element. Anticipation of a coastdown tip-in condition is also provided. When a tip-in condition is sensed, a more aggressive fast fill of the apply element is undertaken in order to handle an approaching input torque increase.
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Holbrook Gerald L.
Kwapis David L.
Leising Maurice B.
Bonck Rodney H.
Calcaterra Mark P.
Chrysler Corporation
Kwon Peter
LandOfFree
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