SYSTEMS AND METHODS FOR EVAP LEAK TESTING

Methods and systems are provided for regulating evaporative emissions from a fuel system. In one example, a method may comprise spinning an engine unfueled responsive to a hydrocarbon concentration at a fresh air end of a fuel vapor canister increasing above a first threshold. The method may compris...

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Bibliographische Detailangaben
Hauptverfasser: Yang, Dennis Seung-Man, Pearce, Russell Randall, Peters, Mark W, Dudar, Aed M
Format: Patent
Sprache:eng
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Beschreibung
Zusammenfassung:Methods and systems are provided for regulating evaporative emissions from a fuel system. In one example, a method may comprise spinning an engine unfueled responsive to a hydrocarbon concentration at a fresh air end of a fuel vapor canister increasing above a first threshold. The method may comprise spinning the engine to pull hydrocarbons away until a hydrocarbon concentration at a purge end of the fuel vapor canister, opposite the fresh air end, increases above a second threshold.