Fuel vapor treatment apparatus, system having the same, method for operating the same
First Claim
1. A fuel vapor treatment apparatus connecting with a fuel tank, which produces fuel vapor to be purged into an intake passage of an internal combustion engine through a purge passage, the fuel vapor treatment apparatus comprising:
- a state measuring unit that includes a measurement passage provided separately from the purge passage,wherein when the measurement passage is blocked from the intake passage, the state measuring unit measures a state of fuel vapor by detecting a physical quantity of the fuel vapor in the measurement passage, the physical quantity being correlative to the state of fuel vapor,the fuel vapor treatment apparatus further comprising;
a diagnosis unit for diagnosing a malfunction of at least one of components of the state measuring unit.
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Abstract
A fuel vapor treatment apparatus connects with a fuel tank, which produces fuel vapor to be purged into an intake passage of an internal combustion engine through a purge passage. The fuel vapor treatment apparatus includes a state measuring unit that includes a measurement passage provided separately from the purge passage. When the measurement passage is blocked from the intake passage, the state measuring unit measures a state of fuel vapor by detecting a physical quantity of the fuel vapor in the measurement passage. The physical quantity is correlative to the state of fuel vapor. The fuel vapor treatment apparatus further includes a diagnosis unit for diagnosing a malfunction of at least one of components of the state measuring unit.
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Citations
21 Claims
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1. A fuel vapor treatment apparatus connecting with a fuel tank, which produces fuel vapor to be purged into an intake passage of an internal combustion engine through a purge passage, the fuel vapor treatment apparatus comprising:
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a state measuring unit that includes a measurement passage provided separately from the purge passage, wherein when the measurement passage is blocked from the intake passage, the state measuring unit measures a state of fuel vapor by detecting a physical quantity of the fuel vapor in the measurement passage, the physical quantity being correlative to the state of fuel vapor, the fuel vapor treatment apparatus further comprising; a diagnosis unit for diagnosing a malfunction of at least one of components of the state measuring unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A fuel vapor treatment system for an internal combustion engine connecting with a fuel tank, the internal combustion engine drawing air through an intake passage, the fuel vapor treatment system comprising:
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a fuel vapor treatment apparatus that includes a purge passage through which fuel vapor produced in the fuel tank is purged into the intake passage, wherein the fuel vapor treatment apparatus further includes a measurement passage trough which fuel vapor flows from the fuel tank, the fuel vapor treatment apparatus further includes a sensing unit for detecting a state of the fuel vapor in the measurement passage when the measurement passage is blocked from the intake passage, and the sensing unit diagnoses a malfunction of the fuel vapor treatment apparatus in accordance with the state of the fuel vapor.
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21. A method for operating a fuel vapor treatment system including a fuel vapor treatment apparatus for purging fuel vapor produced in a fuel tank into an intake passage of an internal combustion engine through a purge passage, the method comprising:
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introducing fuel vapor from the fuel tank into a measurement passage in a condition where the measurement passage is blocked from the intake passage; measuring a state of the fuel vapor in the measurement passage by detecting a physical quantity correlative to the state of fuel vapor; and diagnosing a malfunction of at least one of components constructing the fuel vapor treatment apparatus in accordance with the state of fuel vapor.
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Specification