Methods and systems are provided for managing fuel vapors in a vehicle fuel system. In one example, a method includes commanding or maintaining closed a vapor blocking valve during a purging operation such that vapor flow is directed from a fuel tank to a fresh air side of a vapor canister via a first restricted vapor line, thereby enabling high purge flow rates and deep vapor canister vacuum while avoiding fuel tank vacuum. In this way, canister purge operation may be made more efficient, thereby reducing hydrocarbon bleed emissions.
Method and system for high fuel vapor canister purge flow
2018-08-28
Patent
Electronic Resource
English
IPC: | F02M Zuführen von Brennstoff-Luft-Gemischen oder deren Bestandteilen bei Brennkraftmaschinen allgemein , SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF / B60K Anordnung oder Einbau von Antriebseinheiten oder von Kraft- bzw. Drehmomentübertragungen in Fahrzeugen , ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES / F02D CONTROLLING COMBUSTION ENGINES , Steuern oder Regeln von Brennkraftmaschinen |
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