Apparatus for detecting deterioration of a nox selective reduction catalyst

Vorrichtung zum feststellen der verschlechterung eines katalysators zur selektiven reduktion von stickstoffoxiden

Dispositif de détection de la détérioration d'un catalyseur de réduction sélective des oxydes d'azote


An object of the invention is to detect deterioration of an NOx selective reduction catalyst provided in an exhaust passage of an internal combustion engine with improved accuracy. An apparatus for detecting deterioration of NOx selective reduction catalyst according to the invention has an NOx purification rate calculation unit. A determination as to whether the NOx selective reduction catalyst is deteriorated is made if the temperature of said NOx selective reduction catalyst (Tc) at which the NOx purification rate starts to decrease with a rise in the temperature of said NOx selective reduction catalyst is lower than a predetermined criterion temperature (Tc0).




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Patent Citations (5)

    Publication numberPublication dateAssigneeTitle
    EP-2108793-A1October 14, 2009Bosch CorporationBreakdown diagnosing device for exhaust cleaning system, and breakdown diagnosing method for exhaust cleaning system
    FR-2883922-A1October 06, 2006Bosch Gmbh RobertVehicle`s internal combustion engine controlling method, involves emitting defect signal if conversion signal is less than threshold signal, where conversion signal is determined upstream and downstream of exhaust gas processing unit
    JP-2008144711-AJune 26, 2008Toyota Motor Corp, トヨタ自動車株式会社NOx触媒の異常診断装置及び異常診断方法
    JP-2009127496-AJune 11, 2009Toyota Motor Corp, トヨタ自動車株式会社NOx浄化装置における診断方法および診断装置
    US-2011061372-A1March 17, 2011Gm Global Technology Operations, Inc.Intrusive scr efficency testing systems and methods for vehicles with low temperature exhaust gas

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    Publication numberPublication dateAssigneeTitle