FUEL FLOW RATE CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE

摘要

PURPOSE:To make it possible to obtain a gas mixture having a constantly stabilized air-fuel ratio by a method wherein an air quantity adjusting valve is provided in a bypass air passage formed on the upstream side of a compressor of a supercharger and the valve is controlled by an air quantity detecting means provided the above-mentioned passage. CONSTITUTION:A venturi 7 is formed in a sucked air passage on the upstream side of a compressor 4 arranged coaxially with an exhaust gas turbine 3 operated by exhaust gas and the upstream side of the venturi 7 and the narrowest section of the venturi 7 are made to communicate with each other through the bypass air passage 8. The bypass air passage 8 has a hot wire sensor 9 arranged therein and an air needle valve 23 adopted to vary the surface area of opening of an air orifice 22 is provided on the downstream side of the sensor 9. Further, a fuel injection section 30 is provided on the upstream side of a throttle valve 5 within the sucked air passage 6 and a fuel is supplied through a fuel orifice 36 whose surface area of opening is varied by a fuel needle valve 37. Both of the valves 23 and 37 are controlled by a common proportional electromagnetic magnetic device 24 on the base of the output of the sensor 9.