Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Clutch control
Reexamination Certificate
2006-10-31
2006-10-31
Tran, Dalena (Department: 3661)
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Clutch control
C074S335000, C701S051000
Reexamination Certificate
active
07130734
ABSTRACT:
An electrically variable transmission has a pair of clutches and a first mode when the first clutch is applied and the second clutch released, a second mode when the second clutch is applied and the first clutch released, and a fixed-ratio mode when both clutches are applied. Upshifts and downshifts out of fixed-ratio are accomplished in accordance with a control based upon shift confidence factors determined in accordance with proportional and derivative input speed error quantities. Additional authority limits are placed upon the shift confidence factors in accordance with output speed derivative quantities. Additional override downshift control is provided in accordance with additional input speed condition determinations.
REFERENCES:
patent: 5833570 (1998-11-01), Tabata et al.
patent: 5931757 (1999-08-01), Schmidt
patent: 5979257 (1999-11-01), Lawrie
patent: 5993350 (1999-11-01), Lawrie et al.
patent: 6006620 (1999-12-01), Lawrie et al.
patent: 6019698 (2000-02-01), Lawrie et al.
Sah Jy-Jen F.
Steinmetz Todd M
DeVries Christopher
General Motors Corporation
Tran Dalena
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