Method of monitoring a differential pressure sensor of an exhaust gas treatment system

A method of monitoring a differential pressure sensor of an exhaust gas aftertreatment system includes sensing a learned value (n-1, n, n+1, n+2, etc.) of the differential pressure sensor for each after-run occurrence of the vehicle, and calculating an absolute value of a rate of change between a cu...

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Bibliographische Detailangaben
Hauptverfasser:	KOWALKOWSKI JANEAN E, TYLUTKI VINCENT J, RADKE BENJAMIN
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING ENGINE PLANTS IN GENERAL GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL HEATING LIGHTING MACHINES OR ENGINES IN GENERAL MECHANICAL ENGINEERING STEAM ENGINES WEAPONS
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Beschreibung
Zusammenfassung:	A method of monitoring a differential pressure sensor of an exhaust gas aftertreatment system includes sensing a learned value (n-1, n, n+1, n+2, etc.) of the differential pressure sensor for each after-run occurrence of the vehicle, and calculating an absolute value of a rate of change between a current (n) learned value of the differential pressure sensor and a previous (n-1) learned value of the differential pressure sensor. The absolute value of the rate of change is compared to a threshold pressure value to determine if the absolute value of the rate of change is greater than the threshold pressure value or is less than the threshold pressure value. A fault in the differential pressure sensor is signaled when the absolute value of the rate of change of the learned values is greater than the threshold pressure value.