Fuel property determining apparatus, leakage detecting apparatus, and injection control apparatus
First Claim
1. A fuel property determining apparatus for a fuel vapor treatment apparatus that controls purging of mixture containing fuel vapor, which is generated in a fuel tank and temporarily adsorbed in a canister, into an intake pipe of an internal combustion engine when the internal combustion engine operates, the fuel vapor treatment apparatus controlling the purging on the basis of a fuel vapor state of the mixture, the fuel property determining apparatus comprising:
- a fuel vapor state determining unit for determining the fuel vapor state; and
a fuel property determining unit for determining a fuel property, which is relevant to volatility of fuel, on the basis of change in the fuel vapor state, the change in the fuel vapor state being caused by the purging.
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Accused Products
Abstract
A fuel property determining apparatus is provided to a fuel vapor treatment apparatus. The fuel vapor treatment apparatus controls purging of mixture containing fuel vapor, which is generated in a fuel tank and temporarily adsorbed in a canister, into an intake pipe of an internal combustion engine when the internal combustion engine operates. The fuel vapor treatment apparatus controls the purging on the basis of a fuel vapor state of the mixture. The fuel property determining apparatus includes a fuel vapor state determining unit for determining the fuel vapor state The fuel property determining apparatus further includes a fuel property determining unit for determining a fuel property, which is relevant to volatility of fuel, on the basis of change in the fuel vapor state, the change in the fuel vapor state being caused by the purging.
34 Citations
19 Claims
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1. A fuel property determining apparatus for a fuel vapor treatment apparatus that controls purging of mixture containing fuel vapor, which is generated in a fuel tank and temporarily adsorbed in a canister, into an intake pipe of an internal combustion engine when the internal combustion engine operates, the fuel vapor treatment apparatus controlling the purging on the basis of a fuel vapor state of the mixture, the fuel property determining apparatus comprising:
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a fuel vapor state determining unit for determining the fuel vapor state; and
a fuel property determining unit for determining a fuel property, which is relevant to volatility of fuel, on the basis of change in the fuel vapor state, the change in the fuel vapor state being caused by the purging. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A fuel property determining apparatus provided to a vehicle having a fuel vapor treatment apparatus including a canister for temporarily adsorbing fuel vapor produced in a fuel tank, the fuel vapor treatment apparatus further including a fuel vapor state determining unit for determining a fuel vapor state of mixture, which contains the fuel vapor purged from the canister, the fuel vapor treatment apparatus controlling purging of the fuel vapor, which is temporarily adsorbed in the canister, into an intake pipe of an internal combustion engine when the internal combustion engine operates, the fuel vapor treatment apparatus controlling the purging on the basis of the fuel vapor state, the fuel property determining apparatus comprising:
a fuel property determining unit for determining a fuel property relevant to volatility of fuel on the basis of change in the fuel vapor state, the change in the fuel vapor state being caused by purging the mixture from the canister.
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15. A leakage detecting apparatus for a fuel vapor treatment apparatus that controls purging of mixture containing fuel vapor, which is generated in a fuel tank and temporarily adsorbed in a canister, into an intake pipe of an internal combustion engine when the internal combustion engine operates, the fuel vapor treatment apparatus controlling the purging on the basis of a fuel vapor concentration of the mixture, the leakage detecting apparatus comprising:
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a fuel vapor state determining unit for determining the fuel vapor concentration;
a fuel property determining unit for determining volatility of fuel on the basis of change in the fuel vapor concentration, the change in the fuel vapor concentration being caused by the purging; and
a leakage detecting unit for detecting a leaking hole, which exists in a closed cavity defined by the fuel tank, the canister, and a passage connecting among the fuel tank, the canister, and the intake pipe, wherein the fuel property determining unit determines fuel to be highly volatile when the change in the fuel vapor concentration is less than a predetermined threshold, the leakage detecting unit detects the leaking hole on the basis of change in pressure in the closed cavity, and the leakage detecting unit withholds the detecting when the fuel property determining unit determines the fuel to be highly volatile.
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16. An injection control apparatus for an internal combustion engine having a fuel vapor treatment apparatus that controls purging of mixture containing fuel vapor, which is generated in a fuel tank and temporarily adsorbed in a canister, into an intake pipe of the internal combustion engine when the internal combustion engine operates, the fuel vapor treatment apparatus controlling the purging on the basis of a fuel vapor concentration of the mixture, the injection control apparatus comprising:
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a fuel vapor state determining unit for determining the fuel vapor concentration;
a fuel property determining unit for determining a fuel property, which is relevant to volatility of fuel, on the basis of change in the fuel vapor concentration, the change in the fuel vapor concentration being caused by the purging; and
an injection amount determining unit for determining an amount of fuel injected into the internal combustion engine on the basis of the fuel property.
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17. A method for determining fuel property, which is relevant to volatility of fuel, for an internal combustion engine, the method comprising:
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temporarily adsorbing mixture containing fuel vapor;
purging the mixture into an intake pipe of the internal combustion engine when the internal combustion engine operates; and
determining the fuel property on the basis of change in a fuel vapor state during the purging.
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18. A method for detecting leakage in a fuel vapor treatment apparatus for an internal combustion engine, the method comprising:
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temporarily adsorbing mixture containing fuel vapor, which is generated in a fuel tank, into a canister;
purging the mixture into an intake pipe of the internal combustion engine when the internal combustion engine operates;
determining fuel to be highly volatile when change in a fuel vapor concentration of the mixture during the purging is less than a predetermined threshold;
defining a closed cavity in the fuel tank, the canister, and a passage connecting among the fuel tank, the canister, and the intake pipe; and
detecting leakage in the closed cavity on the basis of change in pressure in the closed cavity when the fuel is determined to be highly volatile.
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19. A method for controlling fuel injection in an internal combustion engine, the method comprising:
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temporarily absorbing mixture containing fuel vapor;
purging the mixture into an intake pipe of the internal combustion engine when the internal combustion engine operates;
determining a fuel property, which is relevant to volatility of fuel, on the basis of change in a fuel vapor concentration of the mixture during the purging; and
determining an amount of fuel injected into the internal combustion engine on the basis of the fuel property.
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Specification