Method and apparatus for controlling reductant injection into an exhaust gas feedstream of an internal combustion engine
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United States of America Patent
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Oct 23, 2018
Grant Date -
Dec 28, 2017
app pub date -
Jun 23, 2016
filing date -
Jun 23, 2016
priority date (Note) -
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Abstract
An exhaust aftertreatment system including a selective catalytic reduction device (SCR), a NOx sensor and a reductant injection system is described. A method for controlling the reductant injection system to inject reductant into the exhaust gas feedstream upstream relative to the SCR includes monitoring engine operation, and determining an initial reductant dosing rate responsive to the engine operation. A dosing perturbation is induced in the reductant dosing rate. The exhaust gas feedstream is monitored via the NOx sensor, and a reductant dosing correction term is determined based upon the monitoring. A final dosing rate for controlling the reductant injection system is determined based upon the initial reductant dosing rate, the dosing perturbation, and the reductant dosing correction term.
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