Interrelated power delivery controls – including engine control – Transmission control – Transmission controlled by engine
Reexamination Certificate
2008-05-20
2008-05-20
Black, Thomas (Department: 3661)
Interrelated power delivery controls, including engine control
Transmission control
Transmission controlled by engine
C477S144000, C477S145000, C701S058000, C701S059000, C701S060000, C701S061000
Reexamination Certificate
active
10868187
ABSTRACT:
The present invention provides a method and apparatus for adaptively controlling a closed throttle downshift in an automatic transmission wherein a transmission aberration during a shift is diagnosed and corrected during subsequent closed throttle downshifts. The invention is carried out by monitoring transmission characteristics including input speed, output speed and shift duration during a closed throttle downshift, and identifying departures from acceptable patterns. Each type of departure calls for a particular remedy, and a suitable adjustment is calculated based on the times and/or the commanded pressures at certain times, the adjustment being implemented by changing one or more initial conditions for the next shift of the same type. The adjustments may have to be large to make a full or significant partial correction at the next shift. Conversely small increments may be necessary to avoid over-correction.
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Black Thomas
General Motors Corporation
Louie Wae
LandOfFree
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