초록 ▼

During the stoppage of an internal combustion engine or the refueling of a fuel tank, evaporative fuel is collected in a canister, and then only the air contained in the evaporative fuel is discharged into the atmosphere. To achieve this, the canister is provided with a plurality of atmosphere commu

During the stoppage of an internal combustion engine or the refueling of a fuel tank, evaporative fuel is collected in a canister, and then only the air contained in the evaporative fuel is discharged into the atmosphere. To achieve this, the canister is provided with a plurality of atmosphere communication lines communicating with the atmosphere side, an air cut valve is installed respectively in each of these atmosphere communication lines, and control means for controlling the operation of the air cut valves is provided.

대표청구항 ▼

An evaporative fuel control system for an internal combustion engine comprising: a canister, installed between an evaporation line communicating with a fuel tank and a purge line communicating with an intake passage of the intake system of said internal combustion engine, said canister and evaporati

An evaporative fuel control system for an internal combustion engine comprising: a canister, installed between an evaporation line communicating with a fuel tank and a purge line communicating with an intake passage of the intake system of said internal combustion engine, said canister and evaporation line defining an evaporative fuel delivery path for introducing evaporative fuel into said canister for absorbing evaporative fuel generated in the fuel tank during stoppage of said internal combustion engine, and said canister and said purge line defining a purge delivery path for purging absorbed evaporative fuel by the introduction of air to deliver the evaporative fuel to said intake passage through said purge line during operation of said internal combustion engine; a purge valve, installed at the intermediate position of said purge line, for controlling the amount of evaporative fuel supplied to said intake passage in accordance with the operation state of said internal combustion engine; an atmosphere communication line in communication with said canister and the atmosphere; a plurality of air cut valves are installed in series in said atmosphere communication line, wherein said plurality of air cut valves comprises a first air cut valve and a second air cut valve, said first air cut valve first disposed along said atmosphere communication line after said canister defining an open position and a closed position, said open position corresponding to an open communication path between said canister and the atmosphere allowing communication between said canister and the atmosphere along said atmosphere communication path, said closed position corresponding to a closed communication path preventing communication between the atmosphere and said canister along said atmosphere communication path, said second air cut valve defining a first position and a second position, said first position directing air from the atmosphere into said atmosphere communication line, said second position directing air from the communication path out of said atmosphere communication line; and control means is provided to control the operation of said first air cut valve so as to open and close said atmosphere communication line and to control the operation of said second air cut valve separated from said canister so as to discharge air from said canister into the atmosphere and introduce air into said canister.