| 摘要 |
PURPOSE:To perform fine control of fuel supply with simple constitution in high reliability, by controlling a quantity of the fuel supply through a solenoid injection valve, open-close controlling the solenoid injection valve in accordance with a quantity of intake air, while open-close controlling said valve with a fixed frequency under a prescribed operational condition. CONSTITUTION:A solenoid fuel injection valve 7 is provided in the downstream side from a portion, where a pump 10 of a supercharger 9 is interposed, in an intake passage 2, and said valve 7 is controlled by a controller 4 to which outputs of a speed sensor 11, intake pressure sensor 12, idle switch 14 and air quantity detector 3 are input. This controller 4 opens and closes the injection valve 7 in such a manner as to synchronously operate or in a follow-up state with a frequency or its divided frequency of an output signal of the air quantity detector 3. While the valve is constituted in such a manner that the injection valve 7 is preferentially open-close controlled by a fixed frequency when a throttle valve 8 is fully closed in a short time, after an operational condition, in which intake pressure becomes at least set pressure in accordance with an engine speed, lasts for at least a prescribed time. |
