| 摘要 |
PURPOSE:To improve ignitability and exhaust capacity ever so better, by making the injection completion timing of a fuel injection value installed in each suction port in time of opening a control valve, to be the earlier the higher in an engine speed, in case of a engine which installs two suction valve in one cylinder and also installs the control valve in the suction port for a high speed suction valve. CONSTITUTION:Two suction valves 4 and 7 are installed in a cylinder 2 having a spark plug at the center, and a suction control valve 12 to be opened in time of high speed is installed in a suction port 8 of a high-speed suction valve 7 having such valve timing as being suitable for high speed use. At each of these low- and high-speed suction ports 5 and 8, there are provided with first and second fuel injection valves 6 and 9, whereby the controlled quantity of fuel is sprayed out of both these injection valves at all times. In time of opening the suction control valve 12, when engine speed or engine load comes high, fuel injection timing is quickened in a proportionate manner. As a result, fuel is fed to a combustion chamber from each suction passage from the outset of a suction stroke so that a rich air-fuel mixture to be formed in and around a spark plug 3 becomes somewhat rarefied. |
