Fuel vapor treatment apparatus
First Claim
1. A fuel vapor treatment apparatus comprising:
- a first canister for adsorbing fuel vapor produced in a fuel tank in such a way that the fuel vapor can be desorbed;
a purge passage for introducing an air-fuel mixture containing fuel vapor desorbed from the first canister into an intake passage of an internal combustion engine and for purging the fuel vapor;
a detection passage for causing the first canister to connect with atmosphere;
a gas flow producing means arranged in the detection passage and for producing a gas flow;
a second canister interposed between the first canister and the gas flow producing means and for adsorbing fuel vapor in the air-fuel mixture in such a way that the fuel vapor can be desorbed; and
a pressure detecting means provided between the first canister and the gas flow producing means and for detecting a pressure when the gas flow producing means produces a gas flow;
wherein flow rate of purge is adjusted on the basis of pressure detected by the pressure detecting means.
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Accused Products
Abstract
A fuel vapor treatment apparatus includes a first canister, a purge passage, an atmosphere passage, a first detection passage provided with a restrictor, and a passage-changing valve for changing the connection passage of the first detection passage between the purge passage and the atmosphere passage. The apparatus further includes a second canister connecting with the first detection passage on the opposite side of the passage-changing valve across the restrictor. A differential pressure sensor detects a pressure difference between both ends of the restrictor. An ECU computes the concentration of fuel vapor on the basis of the detection result of the differential pressure sensor.
36 Citations
31 Claims
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1. A fuel vapor treatment apparatus comprising:
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a first canister for adsorbing fuel vapor produced in a fuel tank in such a way that the fuel vapor can be desorbed;
a purge passage for introducing an air-fuel mixture containing fuel vapor desorbed from the first canister into an intake passage of an internal combustion engine and for purging the fuel vapor;
a detection passage for causing the first canister to connect with atmosphere;
a gas flow producing means arranged in the detection passage and for producing a gas flow;
a second canister interposed between the first canister and the gas flow producing means and for adsorbing fuel vapor in the air-fuel mixture in such a way that the fuel vapor can be desorbed; and
a pressure detecting means provided between the first canister and the gas flow producing means and for detecting a pressure when the gas flow producing means produces a gas flow;
wherein flow rate of purge is adjusted on the basis of pressure detected by the pressure detecting means. - View Dependent Claims (2, 17, 18, 23, 24, 27, 31)
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3. A fuel vapor treatment apparatus comprising:
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a first canister for adsorbing fuel vapor produced in a fuel tank in such a way that the fuel vapor can be desorbed;
a purge passage for introducing an air-fuel mixture containing fuel vapor desorbed from the first canister into an intake passage of an internal combustion engine and for purging the fuel vapor;
an atmosphere passage opened to the atmosphere;
a first detection passage having a restrictor therein;
a passage changing means for changing a passage connecting with the first detection passage between the purge passage and the atmosphere passage;
a second canister connecting with the first detection passage on a side opposite to the passage changing means across the restrictor and for adsorbing fuel vapor in the air-fuel mixture flowing from the first detection passage in such a way that the fuel vapor can be desorbed;
a second detection passage connecting with the second canister; and
a gas flow producing means connecting with the second detection passage and for producing a gas flow in the second detection passage; and
a pressure detecting means for detecting a pressure determined by the restrictor and the gas flow producing means, wherein flow rate of purge is adjusted on the basis of detection result of the pressure detecting means. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 19, 20, 21, 22, 25, 26, 28, 29, 30)
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Specification