A method for a vehicle engine is presented, wherein during a first condition, a vehicle controller is placed in a sleep mode following a vehicle-off event and then awoken following a duration, at which time contents of an air intake system hydrocarbon trap are purged to a fuel vapor canister by operating an electric motor to rotate the vehicle engine in a reverse direction. Rotating the vehicle engine in a reverse direction causes atmospheric air to enter an intake of the engine via an exhaust of the engine, desorbing hydrocarbons bound to the air intake system hydrocarbon trap. By porting the desorbed hydrocarbons to the fuel vapor canister, bleed emissions from the air intake system hydrocarbon trap may be reduced.
System and methods for purging an air intake system hydrocarbon trap to a fuel vapor canister
2019-01-22
Patent
Electronic Resource
English
IPC: | B60W CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION , Gemeinsame Steuerung oder Regelung von Fahrzeug-Unteraggregaten verschiedenen Typs oder verschiedener Funktion / F02D CONTROLLING COMBUSTION ENGINES , Steuern oder Regeln von Brennkraftmaschinen / F02M Zuführen von Brennstoff-Luft-Gemischen oder deren Bestandteilen bei Brennkraftmaschinen allgemein , SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF |
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