Element overlap control for an automatic transmission

Details Element overlap control for an automatic transmission Element overlap control for an automatic transmission

2000-03-09

2000-12-12

Marmor, Charles A

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477143, 701 60, F16H 6104, G06F 1700

Patent

active

061591297

ABSTRACT:
The present invention provides a method for shifting from a first gear state to a second gear state which holds one element at a predetermined level until the second reaches its fill volume. In this method, one element is applied while the other element is released. The element which reaches its fill volume first is held at a control limit. This control limit is defined by a volume between the first clutch element and a predetermined point above the fill volume of the first clutch element. This clutch element is then maintained at within the control limit until the other clutch element reaches its fill volume. The maintained clutch element is then released shortly after the other clutch element has reached its fill volume. This method ensures that neither fighting or slipping occurs between the two elements.

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