Method and system for reducing vehicle emissions using a sensor downstream of an emission control device
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United States of America Patent
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-
Apr 15, 2003
Grant Date -
Dec 19, 2002
app pub date -
Jun 19, 2001
filing date -
Jun 19, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A system and method is provided for controlling a lean-burn engine whose exhaust gas is directed through an exhaust treatment system which includes an emission control device that alternately stores and releases a selected constituent of the exhaust gas, such as NO.sub.x, based on engine operating conditions, and a downstream NO.sub.x sensor. The system estimates the concentration of NO.sub.x flowing into the device based on engine operating conditions while determining a value for the concentration of NO.sub.x flowing out of the device based upon the output signal generated by NO.sub.x sensor. A device purge event is scheduled when the device efficiency, calculated based on the NO.sub.x concentrations flowing into and out of the device, falls below a predetermined minimum efficiency value. The length of a purge event is determined as a function of an accumulated measure based on the difference between the NO.sub.x concentrations into and out of the device.
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