A method for combusting a vapor of a fuel accumulated in a crankcase of an engine, the engine disposed in a vehicle having a fuel tank and an adsorbent canister coupled to the fuel tank. The method comprises flowing compressed air from a first air source through the crankcase to yield a crankcase ef
A method for combusting a vapor of a fuel accumulated in a crankcase of an engine, the engine disposed in a vehicle having a fuel tank and an adsorbent canister coupled to the fuel tank. The method comprises flowing compressed air from a first air source through the crankcase to yield a crankcase effluent enriched in gasses leaked from the combustion chamber, which include the fuel vapor. The method further comprises combining the crankcase effluent with an effluent from the adsorbent canister, also enriched in the vapor, and, flowing the combined crankcase and adsorbent-canister effluent to an intake of the engine via a conduit.
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1. A method for combusting a vapor of a fuel accumulated in a crankcase of an engine, the engine disposed in a vehicle having a fuel tank and an adsorbent canister coupled to the fuel tank, the method comprising: flowing compressed air from a first air source through the crankcase to yield a crankca
1. A method for combusting a vapor of a fuel accumulated in a crankcase of an engine, the engine disposed in a vehicle having a fuel tank and an adsorbent canister coupled to the fuel tank, the method comprising: flowing compressed air from a first air source through the crankcase to yield a crankcase effluent enriched in the vapor;combining the crankcase effluent with an effluent from the adsorbent canister also enriched in the vapor; andflowing the combined crankcase and adsorbent-canister effluent to an intake of the engine via a conduit. 2. The method of claim 1, where the compressed air is flowed through the crankcase only when a throttle-inlet pressure of the engine exceeds a manifold air pressure of the engine. 3. The method of claim 1, where the compressed air is flown through the crankcase only when a manifold air pressure of the engine exceeds barometric pressure. 4. The method of claim 1, where the compressed air is flown through the crankcase only when a throttle-inlet pressure of the engine exceeds barometric pressure. 5. The method of claim 1, where the first air source includes a compressor coupled to the intake of the engine. 6. The method of claim 5, where the compressor is a turbocharger compressor mechanically coupled to a turbine driven by exhaust from the engine. 7. The method of claim 5, further comprising cooling the compressed air before flowing the compressed air through the crankcase. 8. The method of claim 5, further comprising flowing the compressed air through a throttle valve coupled to the intake of the engine before flowing the compressed air through the crankcase. 9. The method of claim 1, where a throttle valve is coupled to the intake of the engine, the method further comprising flowing the compressed air through a portioning valve different than the throttle valve before flowing through the crankcase. 10. The method of claim 1, where flowing the combined crankcase and adsorbent-canister effluent to the intake of the engine comprises admitting the combined crankcase and adsorbent-canister effluent to a compressor coupled to the intake of the engine. 11. The method of claim 1, the method further comprising flowing some compressed air into the adsorbent canister only when the compressed air is flowing through the crankcase. 12. The method of claim 1, where the compressed air from the first air source is flown through the crankcase along a first flow path during a first operating condition, where the first operating condition includes a higher availability of compressed air, the method further comprising during a second operating condition including a lower availability of compressed air, drawing air from a second air source through the crankcase. 13. The method of claim 12, where the second air source is the atmosphere, and where drawing the air through the crankcase during the second operating condition comprises flowing the air along a second flow path, different than the first flow path. 14. The method of claim 12, where the second air source is a vacuum pump discharge of the vehicle, and where drawing the air through the crankcase during the second operating condition comprises flowing the air along the first flow path. 15. The method of claim 12, where the second operating condition further includes a manifold air pressure of the engine being less than the barometric pressure. 16. The method of claim 12, where the first and second operating conditions overlap such that compressed air flows through the crankcase along the first flow path and uncompressed air flows through the crankcase along the second flow path simultaneously. 17. A method for combusting a vapor of a fuel accumulated in a crankcase of an engine, the engine disposed in a vehicle having a fuel tank and an adsorbent canister coupled to the fuel tank, the method comprising: flowing compressed air through the crankcase to yield a crankcase effluent enriched in the vapor;flowing air through the adsorbent canister to yield a canister effluent also enriched in the vapor; andflowing the crankcase effluent combined with the canister effluent through a conduit and to an intake of the engine. 18. The method of claim 17, further comprising flowing some compressed air through a venturi device configured to draw the canister effluent from the adsorbent canister and into the crankcase effluent, where the canister effluent and the crankcase effluent flow via the conduit to a compressor coupled to the intake of the engine. 19. A method for combusting a vapor of a fuel accumulated in a crankcase of an engine, the method comprising: when a throttle-intake pressure of the engine is greater than barometric pressure, flowing the compressed air through the crankcase along a first flow path to yield a first crankcase effluent enriched in the vapor;when a manifold air pressure of the engine is less than barometric pressure, drawing uncompressed air through the crankcase along a second flow path different that the first flow path to yield a second crankcase effluent enriched in the vapor, and, portioning the second crankcase effluent;mixing effluent from the adsorbent canister into one or both of the first crankcase effluent and the second crankcase effluent; andflowing the first and second crankcase effluents to an intake of the engine. 20. The method of claim 19, wherein at least some air is flown through the crankcase along the first and second flow paths simultaneously.
Bugin ; Jr. Marion (Troy MI) Dawson Gary D. (Rochester MI) Franks Kerry D. (Lafayette CO) Geiss Richard O. (Dexter MI) Kerska Donald H. (Royal Oak MI), Canister purge for turbo engine.
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