| 摘要 |
PURPOSE:To prevent the lowering of the output of a captioned engine by starting to open a throttle valve for charging-control in a supercharging route from the point where a throttle valve for air or air-fuel mixture control in a natural suction route is opened halfway for avoiding the inclination of the air-fuel ratio of the mixture to be lean near the full opening of an accelerator. CONSTITUTION:Air-fuel mixture is introduced into a cylinder 1 via a suction passage 7 on the basis of negative pressure generated by the fall of a piston 4 in a natural suction route 2. The pressurized air by a supercharger 11 is introduced into the cylinder 1 through a supercharging passage 13 via a supercharging port in a supercharging route 3. A suction valve 8 is opened near the top dead point, and closed when passing the bottom dead point. A supercharging valve 14 is opened on the way of the opening of a suction valve 8, and closed after the suction valve is closed. When a throttle valve 16 of a carburetter 9 is about 60-80% opened, a throttle valve 15 of a supercharging route 3 starts opening. |
