Method for evaluating degradation of a particulate matter sensor after an engine start

Method for evaluating degradation of a particulate matter sensor after an engine start

A system for improving operation of an engine having a particulate matter sensor is presented. The system may be used to improve engine operation during cold starts especially under conditions where water vapor or entrained water droplets are present in vehicle exhaust gases. In one embodiment, part...

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Bibliographische Detailangaben
Hauptverfasser: HOPKA MICHAEL, NOVAK ROBERT F, RUONA WILLIAM CHARLES, VAN NIEUWSTADT MICHIEL J, TERAN, JR. ROBERTO, ZAWACKI GARRY ANTHONY, WEBER DAVE CHARLES
Format: Patent
Sprache:eng
Schlagworte:
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
MEASURING
PHYSICS
TESTING
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Beschreibung
Zusammenfassung:A system for improving operation of an engine having a particulate matter sensor is presented. The system may be used to improve engine operation during cold starts especially under conditions where water vapor or entrained water droplets are present in vehicle exhaust gases. In one embodiment, particulate sensor degradation is indicated in response to an output of said particulate matter sensor staying below a threshold as engine temperature increases past the dewpoint temperature.