Fueling control system
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United States of America Patent
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May 20, 2003
Grant Date -
Dec 12, 2002
app pub date -
Jan 30, 2001
filing date -
Jan 30, 2001
priority date (Note) -
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Abstract
A method for controlling air-fuel ratio of an engine coupled to an emission control device uses an upstream linear exhaust gas sensor and a switching downstream exhaust gas sensor. During stoichiometric operation, both sensors are used for feedback control. During operation away from stoichiometry, the downstream sensor feedback is disabled.
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