Methods and systems are provided for improving air intake system hydrocarbon trap purging during engine-off time in a hybrid electric vehicle. One method includes opening the throttle during vehicle motion under battery operation and allowing airflow through the trap to purge its contents into the fuel canister via the canister purge valve. Upon transition into the engine-on mode, fuel vapors are released from the canister into the engine intake.
Method for purging of air intake system hydrocarbon trap
Patent
Electronic Resource
Systems and methods for purging air intake system hydrocarbon trap of hybrid vehicle
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