Adaptive exhaust temperature estimation and control
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United States of America Patent
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Mar 3, 1998
Grant Date -
N/A
app pub date -
Dec 13, 1996
filing date -
Dec 13, 1996
priority date (Note) -
Expired
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Abstract
A method and apparatus for inferring and controlling the temperature of a NO.sub.x trap located downstream from a three-way catalyst that employs a temperature sensor to correct a temperature estimation model under relatively steady-state conditions to provide a more accurate estimate of NO.sub.x trap temperature and three-way catalyst temperature. In a second embodiment, the three-way catalyst also includes a temperature sensor for improving the instantaneous catalyst temperature estimation.
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