ENGINE FUELING CONTROL FOR CATALYST DESULFURIZATION
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United States of America Patent
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Apr 8, 2003
Grant Date -
May 1, 2003
app pub date -
Oct 29, 2001
filing date -
Oct 29, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
A method is described for controlling decontamination of an emission control device. Temperature of the emission control device is maintained at a desired temperature by operating some cylinders of the engine lean and others rich. These lean and rich mixtures react exothermically in the exhaust gas and in the emission control device to generate heat. Efficient contaminant removal is obtained by oscillating the mixture air-fuel ratio about stoichiometry. This oscillation is provided by adjusting the fuel provided to the rich cylinders, or by adjusting the air provided to the lean cylinders, thereby minimizing any torque disturbance corresponding to the oscillations in exhaust air-fuel ratio.
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