| 摘要 |
PURPOSE:To simplify the system in a feedback carburetter by introducing the air from an evaporation system to be supplied to the carburetter for making the purge-start signal of the evaporation system in common with the air-fuel ratio feedback start signal. CONSTITUTION:A purge passage 13 in a canister 8 is connected to an EBCV (electronic bleed control valve) 14, and a main bleed passage 15 is connected to a fuel regulation jet 6 via the EBCV14, while a slow bleed passage 16 is connected to a slow port 5. The EBCV14 is controlled to be on or off by an elecctonic control unit 18 which outputs a solenoid valve operation signal for controlling the air-fuel ratio near to a theoretical air-fuel ratio on the basis of the output signal of an O2-sensor 17, and the valve is opened when it is on. This construction permits to start the feedback and the purge of the evaporation system simultaneously. |
