SYSTEM AND METHOD FOR CONTROLLING AIR-FUEL RATIO
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United States of America Patent
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Issued Date -
Sep 1, 2016
app pub date -
May 10, 2016
filing date -
May 10, 2016
priority date (Note) -
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Abstract
The disclosure provides a method to operate an engine system. The method begins by determination of a current NOx value. If the current NOx value is greater than a first predetermined NOx target, an air-fuel ratio (AFR) set-point is adjusted by a first predetermined value in towards a rich AFR. Upon detection of the current NOx value below the first predetermined NOx target, a first average of NOx values for a first predetermined time is determined. The AFR set-point is adjusted by a second predetermined value and a second average of NOx values for a second predetermined time is determined. A delta NOx value is determined as a difference between the first average and the second average and compared with a second predetermined NOx target. The AFR set-point is determined when the delta NOx value is below the second predetermined NOx target.
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