Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – With indicator or control of power plant
Reexamination Certificate
2006-09-12
2006-09-12
Kwon, John T. (Department: 3747)
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
With indicator or control of power plant
C123S480000, C123S568160
Reexamination Certificate
active
07107143
ABSTRACT:
A method of estimating oxygen concentration in the intake of a lean burn engine is accomplished during throttled operation by repeatedly combining determined air/fuel ratio and intake mass air flow and estimated cylinder mass flow and exhaust gas recirculation flow in a state observer, which calculates exhaust and intake burned gas fractions and resulting percent oxygen in the intake manifold. During unthrottled operation, estimation is corrected by an adaptive disturbance estimator, which operates to correct all input disturbances under conditions of higher EGR and to correct only MAF flow values under lower EGR conditions. Steps for operation of the state observer and for determining or estimating input conditions to the state observer are set forth.
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General Motors Corporation
Kwon John T.
Marra Kathryn A.
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