Air/fuel ratio control responsive to catalyst window locator
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United States of America Patent
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Apr 2, 2002
Grant Date -
N/A
app pub date -
May 2, 2000
filing date -
May 2, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
An air/fuel control method for an engine including a NO.sub.x sensor in operative relationship to a catalytic converter. The method comprises the steps of providing a base fuel signal related to a quantity of air inducted into the engine and generating a bias signal for biasing the base fuel signal towards a leaner air/fuel ratio. The output of the NO.sub.x sensor is monitored to detect a predetermined exhaust gas NO.sub.x value representing a predefined NO.sub.x conversion efficiency. The base fuel signal is then modified as a function of the bias signal corresponding to the predetermined exhaust gas NO.sub.x value to maintain the catalytic converter within a desired efficiency range. In one aspect of the invention, the process of detecting the edge of the NO.sub.x conversion efficiency window is executed at predetermined time periods measured by the distance the vehicle traveled, or the elapsed time since last base fuel value modification.
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