| 摘要 |
PURPOSE:To improve control of an air-fuel ratio and atomization of fuel, by a method wherein, by means of a pressure air and suction negative pressure, which depend upon the rotation of an engine, the pressure of fuel is regulated, and the pressure-regulated fuel is atomized by means of an exhaust air from an engine- driven air pump. CONSTITUTION:An air pump 7, and a fuel pump 14 are driven during running of an engine, and an exhaust air from the air pump 7 is fed to an air nozzle 33 and an air chamber 20 of a pressure regulator 16. A discharge fuel from the fuel pump 14 is fed to a fuel injection nozzle 34 through a fuel chamber 17 of the pressure regulator 16. Fuel injected through the fuel injection nozzle 34 collides with the flow of the air, injected at a high speed through the air injection nozzle 33, for mixture, and the mixture is fed to the engine with the aid of the suction air flow of a suction passage 3. In which case, when the opening of a throttle valve 5 is decreased, the pressure of the air exhausted from the air pump 7 is low, and a negative pressure through a negative pressure passage 25 is high, whereby a pressure in an air chamber 20 is decreased, a diaphragm 21 is raised against a spring 22, and a relief valve 19 is increased in opening, resulting in decrease in fuel pressure (a flow rate). |
