Closed-loop temperature control for an emission control device
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United States of America Patent
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Feb 17, 2004
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N/A
app pub date -
Oct 16, 2000
filing date -
Oct 16, 2000
priority date (Note) -
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Abstract
A system and method are provided for closed-loop monitoring of temperature within a vehicle emission control device to control air-fuel ratio (AFR) and corresponding production of exotherm to accurately maintain a desired temperature range. A temperature sensor is positioned within the emission control device to provide a direct measurement of temperature within the device. Inlet temperature can be either directly measured or estimated using a temperature model. Actual temperature within the device is estimated as a function of the inlet and measured temperatures. The estimated actual temperature is used to modify the AFR in the exhaust gases flowing through the emission control device.
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