| 摘要 |
PURPOSE:To hasten fuel to become mist by providing each cylinder with low speed and high speed air intake passages being independent of each other and setting the fuel injection timing of a two-steps nozzle fuel injection valve for supplying both passages with fuel outside the air intake stroke when a high speed control valve is closed and inside the air intake stroke when it is opened. CONSTITUTION:Each cylinder 1 is provided with two air intake ports 6a and 6b to which a low speed air intake passage 11a which is directed so that air intake swirls may be formed and a high speed air intake passage 11b are connected respectively. Between the low speed air intake passage 11a and the high speed air intake passage 11b, a two-steps nozzle fuel injection valve 18 for injectingly supplying both passages 11a and 11b with fuel is provided. The high speed air intake passage 11b is provided with control valve 13 which opens in high speed running so that the injection timing of the fuel injection valve 18 may be set outside the air intake stroke of the cylinder 1 when the control valve 13 is closed and may be shifted inside the intake stroke of the cylinder 1 when the control valve 13 is opened. |
