Evaporative emission control system
AssigneeNissan Motor Co., Ltd.
InventorAkihiro Kawano
Life of this patent
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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.
Claims11
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.
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 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.
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:
- detecting the pressure in the passage, and
- setting the detected pressure before engine startup as an atmospheric pressure.
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:
- 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.
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, and
- means for detecting the pressure in the passage before engine startup as an atmospheric pressure.
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,
- 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.
Dependencies are inferred from the claim text.