Emission control for improved vehicle performance
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United States of America Patent
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May 21, 2002
Grant Date -
N/A
app pub date -
Aug 2, 2000
filing date -
Aug 2, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A method is presented for correcting the output of the NO.sub.x sensor during a time period starting with the end of the NO.sub.x purge cycle and ending when the amount of tail pipe O.sub.2 exceeds a preselected value. During that period, fuel is being deposited on the NO.sub.x sensor thus causing an incorrect reading. Proper amount of NO.sub.x generated during that time is calculated by assuming that the NOx level during the incorrect reading is equal to the NO.sub.x reading after the end of the incorrect reading, and multiplying that amount by total integrated air mass. This method helps avoid unnecessary NO.sub.x purges and improves fuel economy.
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