Oxygen correction for engine-out NOx estimates using a NOx sensor of an aftertreatment system
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United States of America
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Jan 21, 2020
Grant Date -
Aug 2, 2018
app pub date -
Jul 29, 2016
filing date -
Jul 29, 2016
priority date (Note) -
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Abstract
An aftertreatment system comprises a SCR system including at least one catalyst. A NOx sensor is positioned downstream of the SCR system. A controller is configured to determine an estimated engine NOx amount in the exhaust gas produced by an engine fluidly coupled to the aftertreatment system. The controller interprets an output value indicative of a first amount of oxygen in the exhaust gas downstream of the SCR system. The controller determines an adjusted engine NOx amount in response to the output value. A NOx sensor is positioned downstream of the selective catalytic reduction system and communicatively coupled to the controller. The NOx sensor is structured to provide the output value.
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