Patent ID: 7318425
Filing Date: 2008-01-15
Classification: F02D,F02M

Abstract:
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.