FUEL VAPOR PURGING DIAGNOSTICS
First Claim
1. A method of monitoring reverse flow of fuel vapors and/or air through a vehicle fuel vapor recovery system, said fuel vapor recovery system coupled to an engine intake of a boosted internal combustion engine, the method comprising:
- during boost, when the fuel vapor recovery system is commanded to be sealed from the intake, indicating degradation based on a pressure value at a venturi in the fuel vapor recovery system.
1 Assignment
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Accused Products
Abstract
Systems and methods are provided for monitoring reverse flow of fuel vapors and/or air through a vehicle fuel vapor recovery system, said fuel vapor recovery system coupled to an engine intake of a boosted internal combustion engine. One example method comprises, during boost, when the fuel vapor recovery system is commanded to be sealed from the intake, indicating degradation based on a pressure value at a venturi in the fuel vapor recovery system.
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Citations
41 Claims
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1. A method of monitoring reverse flow of fuel vapors and/or air through a vehicle fuel vapor recovery system, said fuel vapor recovery system coupled to an engine intake of a boosted internal combustion engine, the method comprising:
during boost, when the fuel vapor recovery system is commanded to be sealed from the intake, indicating degradation based on a pressure value at a venturi in the fuel vapor recovery system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 28, 29, 30, 31)
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9. A system, comprising:
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an engine comprising an intake; a boosting device with a compressor configured to provide a boost to the engine intake; a fuel vapor recovery system coupled to the engine intake, said fuel vapor recovery system including a pressure transducer coupled to a venturi, a fuel vapor canister, a canister purge valve, a check valve, and a canister vent valve; and a control system configured to, command the fuel vapor recovery system to be at least partially un-sealed from the intake during at least a boosted condition; and indicate degradation of the check valve based on the pressure transducer. - View Dependent Claims (10, 11, 12, 16, 18, 32, 33)
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13-15. -15. (canceled)
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17. (canceled)
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19. A method of monitoring reverse flow of fuel vapors and/or air through a vehicle fuel vapor recovery system coupled to a boosted engine intake, the fuel vapor recovery system including a fuel tank pressure transducer coupled to a venturi, comprising:
during boost, when the fuel vapor recovery system is commanded to be sealed from the intake, indicating degradation based on a presence of a flow through the venturi of the fuel vapor recovery system. - View Dependent Claims (20, 22)
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21. (canceled)
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23-27. -27. (canceled)
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34. A system, comprising:
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an engine comprising an intake; a boosting device with a compressor configured to provide a boost to the engine intake; a fuel vapor recovery system coupled to the engine intake, said fuel vapor recovery system including a pressure transducer coupled to a venturi, a fuel vapor canister, a canister purge valve, and a canister vent valve; and a control system configured to, command the fuel vapor recovery system to be sealed from the intake during at least a boosted condition; and indicate degradation of the canister purge valve based on the pressure transducer. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41)
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Specification