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US 2014/0318504 A1Published application
Air intake system hydrocarbon trap purging
AssigneeFord Global Technologies, LLC
InventorsRussell Randall Pearce, Aed M. Dudar, Dennis Seung-Man Yang
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Abstract
Methods and systems for purging a hydrocarbon trap in an engine intake in a vehicle are disclosed. In one example approach, a method comprises during an engine off condition, operating a pump in a purge line coupled to a fuel vapor canister in an emission control system to deliver fuel stored in a hydrocarbon trap in an intake of the engine to the fuel vapor canister.
Claims20
A method for a vehicle with an engine, comprising:
- during an engine off condition, operating a pump in a purge line coupled to a fuel vapor canister in an emission control system to deliver fuel stored in a hydrocarbon trap in an intake of the engine to the fuel vapor canister.
A method for a hybrid vehicle with an engine, comprising:
- during an engine off condition when an amount of fuel vapor stored in a fuel vapor canister in an emission control system is less than a threshold amount:
- opening a throttle in an intake of the engine;
- opening a purge valve in a purge line coupled to the fuel vapor canister;
- and
- operating a pump in the purge line to deliver fuel stored in a hydrocarbon trap in an intake of the engine to the fuel vapor canister.
2 more elements
A hybrid vehicle system, comprising:
- a hydrocarbon trap in an intake of an engine;
- a fuel vapor canister coupled to the intake of the engine via a purge line;
- a pump in a vent path of the fuel vapor canister;
- a fuel tank coupled to the fuel vapor canister;
- a purge valve in the purge line;
- a throttle in the intake of the engine;
- and
- a controller configured to:
- during an engine off condition when an amount of fuel vapor stored in the fuel vapor canister is less than a threshold amount:
- open the throttle;
- opening the purge valve;
- and
- operate the pump to deliver fuel stored in a hydrocarbon trap to the fuel vapor canister.
10 more elements
Dependencies are inferred from the claim text.