Method for correcting an exhaust gas oxygen sensor
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United States of America Patent
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Jul 8, 2003
Grant Date -
N/A
app pub date -
Feb 14, 2001
filing date -
Feb 14, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An engine air/fuel controller is responsive to an exhaust gas oxygen sensor positioned upstream of a catalytic converter and a proportional exhaust gas oxygen sensor positioned downstream of the catalytic converter. An air/fuel ratio signal provided by the downstream exhaust gas oxygen sensor is adjusted by a correction bias value. A first preferred method of deriving the correction bias value includes calculating the difference between the average of the upstream and downstream air/fuel ratios when the upstream sensor indicates lean operation of the engine. The second preferred method includes deriving the correction bias according a pre-determined and pre-programmed correction bias function, which provides correction bias values as a function of the of the air/fuel ratio measured by the downstream sensor.
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