| 摘要 |
PURPOSE:To simplify the structure of an electronically controlled vaporizing apparatus, to prevent troubles like disconnection of wires and production of noises and to enable to cool an electronic control circuit effectively, by incorporating the electronic control circuit in the body of a carburetor, and disposing the electronic control circuit very closely to a flow control mechanism. CONSTITUTION:An electronic control circuit 18 is disposed in a float chamber 15 of a carburetor 11 so that it is cooled directly by fuel 14 in the float chamber 15. Further, there is provided a flow control mechanism 27 in the manner that it is connected directly with the circuit 18. A control valve 27b attached to an actuator 27a of the control mechanism 27 controls opening and closing of a fuel passage 20 which is opened at the bottom of the float chamber 15. In response to an output signal A of an oxygen sensor, the electronic control circuit 18 produces a ''rich'' or ''lean'' signal and controls the flow control mechanism 27 on the basis of this ''rich'' or ''lean'' signal to increase or decrease the injection quantity of fuel. Thus, it is enabled to control the air-fuel ratio of an internal combustion engine to keep it at a value near the theoretical air-fuel ratio automatically. |
