Evaporative emission control system
First Claim
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1. A fuel evaporative emission control system of an engine comprising:
- a fuel tank, a passage connecting the fuel tank and an intake passage of the engine, a canister provided in the passage, which adsorbs fuel evaporating gas vaporized in the fuel tank, a purge valve installed between the intake passage and the canister, a sensor which is provided between the purge valve and the fuel tank and detects the pressure in the passage, and a controller functioning to detect the pressure in the passage before engine startup as an atmospheric pressure.
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Abstract
An evaporative emission control system for an engine (1) includes a fuel tank (2), a pipe (4, 7) connecting the fuel tank and an engine intake passage, a canister (3) which adsorbs fuel evaporating gas vaporized in the fuel tank, a purge valve (8) provided between the intake passage and the canister, and a sensor (9) which is provided between the purge valve and the fuel tank, and detects absolute pressure in the pipe. A controller (15) sets the detected pressure before engine startup as an atmospheric pressure.
21 Citations
11 Claims
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1. A fuel evaporative emission control system of an engine comprising:
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a fuel tank, a passage connecting the fuel tank and an intake passage of the engine, a canister provided in the passage, which adsorbs fuel evaporating gas vaporized in the fuel tank, a purge valve installed between the intake passage and the canister, a sensor which is provided between the purge valve and the fuel tank and detects the pressure in the passage, and a controller functioning to detect the pressure in the passage before engine startup as an atmospheric pressure. - View Dependent Claims (2, 3)
the pressure in the passage before engine startup is the pressure in the passage immediately prior to engine startup.
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3. The emission control system as defined in claim 1, further comprising:
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a sensor which electrically detects engine startup, wherein the pressure in the passage before engine startup is the maximum value of the pressures detected until the engine startup is electrically detected.
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4. A fuel evaporative emission control system of an engine, comprising:
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a fuel tank, a passage connecting the fuel tank and an intake passage of the engine, a canister provided in the passage, which adsorbs fuel evaporating gas vaporized in the fuel tank, a purge valve installed between the intake passage and the canister, a sensor which is provided between the purge valve and the fuel tank and detects the pressure in the passage, and a controller functioning to;
detect the pressure in the passage before engine startup as a first pressure, detect the pressure in the passage after engine startup as a second pressure, compute the pressure difference between the first pressure and the second pressure, and determine a fault of the purge valve based on the pressure difference. - View Dependent Claims (5, 6, 7)
a sensor which electrically detects a rotation of the engine, wherein the pressure in the passage before engine startup is the maximum value of the pressures detected until the engine startup is electrically detected.
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8. An atmospheric pressure detection method for a fuel evaporative emission control system of an engine, the system including a fuel tank, a passage connecting the fuel tank and an intake passage of the engine, a canister provided in the passage, which adsorbs fuel evaporating gas vaporized in the fuel tank, and a purge valve installed between the intake passage and the canister, the method comprising:
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detecting the pressure in the passage, and setting the detected pressure before engine startup as an atmospheric pressure.
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9. An atmospheric pressure detection method for a fuel evaporative emission control system of an engine, the system including a fuel tank, a passage connecting the fuel tank and the intake passage of the engine, a canister provided in the passage, which adsorbs fuel evaporating gas vaporized in the fuel tank, and a purge valve installed between the intake passage and the canister, the method comprising:
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detecting the pressure in a passage before engine startup as a first pressure, detecting the pressure in the passage after engine startup as a second pressure, computing the pressure difference between the first pressure and second pressure and determining a fault of the purge valve based on the pressure difference.
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10. A fuel evaporative emission control system of an engine comprising:
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a fuel tank, a passage connecting the fuel tank and an intake passage of the engine, a canister provided in the passage, which adsorbs fuel evaporating gas vaporized in the fuel tank, a purge valve installed between the intake passage and the canister, and means for detecting the pressure in the passage before engine startup as an atmospheric pressure.
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11. A fuel evaporative emission control system of an engine, comprising:
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a fuel tank, a passage connecting the fuel tank and an intake passage of the engine, a canister provided in the passage, which adsorbs fuel evaporating gas vaporized in the fuel tank, a purge valve installed between the intake passage and the canister, means for detecting the pressure in the passage before engine startup as a first pressure, means for detecting the pressure in the passage after engine startup as a second pressure, means for computing the pressure difference between the first pressure and the second pressure, and means for determining a fault of the purge valve based on the pressure difference.
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Specification