Method and apparatus for urea injection in an exhaust aftertreatment system
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United States of America Patent
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Sep 23, 2008
Grant Date -
Jan 31, 2008
app pub date -
Jul 25, 2006
filing date -
Jul 25, 2006
priority date (Note) -
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Abstract
An exhaust aftertreatment system and control system is provided, including a urea injecting device, a selective catalyst reduction device, and, a sensing device operative to monitor a forward portion of the selective catalyst reduction device. The sensing device can comprise a NOx sensor, and alternatively, an ammonia sensor. A control module adapted to monitor signal inputs from the engine, the NOx sensing system, the temperature sensing system, and the sensing device operative to monitor a forward portion of the selective catalyst reduction device; and, adapted to control operation of the urea injecting device.
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