Method of controlling the air to fuel ratio in a flexible fueled vehicle during wide open throttle or part throttle enrichment operation
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United States of America Patent
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Aug 17, 1999
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N/A
app pub date -
Oct 29, 1997
filing date -
Oct 29, 1997
priority date (Note) -
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Abstract
The present invention provides a method for controlling combustion parameters of an internal combustion engine during wide open throttle or part throttle enrichment operation. Oxygen sensor rich and lean counts above and below a stoichiometric air/fuel ratio are counted during an injector pulse width period while a fuel concentration determination is being made at wide open throttle and part throttle enrichment. The ratio of lean counts to rich counts is compared to a calibratable value for incrementing the fuel concentration delivered to the internal combustion engine. The fuel concentration is further controlled if a boil-off condition is detected.
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