发明名称 |
METHOD AND APPARATUS FOR MONITORING A REDUCTANT INJECTION SYSTEM IN AN EXHAUST AFTERTREATMENT SYSTEM |
摘要 |
An internal combustion engine operating at a lean air/fuel ratio includes a reductant injection system configured to dispense reductant into an exhaust gas feedstream upstream of a selective catalytic reduction device. The reductant injection system includes a reductant delivery system fluidly coupled to a reductant dispensing device that is configured to dispense the reductant. A method for monitoring the reductant injection system includes commanding the reductant dispensing device to dispense reductant at a prescribed reductant flowrate, controlling the reductant delivery system to a preferred operating state, monitoring operation of the reductant delivery system and estimating a reductant flowrate as a function of the monitored operation of the reductant delivery system, and diagnosing operation of the reductant injection system as a function of the prescribed reductant flowrate and the estimated reductant flowrate.
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申请公布号 |
US2011083424(A1) |
申请公布日期 |
2011.04.14 |
申请号 |
US20090576399 |
申请日期 |
2009.10.09 |
申请人 |
GM GLOBAL TECHNOLOGY OPERATIONS, INC. |
发明人 |
WANG YUE-YUN;SOLBRIG CHARLES E.;LEVIJOKI STEPHEN PAUL |
分类号 |
F01N11/00;F01N3/04;F01N3/10;F01N9/00 |
主分类号 |
F01N11/00 |
代理机构 |
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