| 摘要 |
PURPOSE:To reduce the amount of unburnt components discharged to the exhaust system due to misfiring, by improving engine performance and preventing occurrence of misfiring effectively by omitting part of fuel injection pulses when the engine speed or the supercharging pressure has exceeded a prescribed value, and thereby varying the engine output substantially continuously. CONSTITUTION:A control circuit 12 drives a fuel injection valve 6 to open and close the same and applies fuel injection pulses shown at A1 in the drawing to the fuel injection valve 6 accoding to the output signals of various means including an engine-speed signal generating means 16 which utilizes the ignition timing IG to produce signals synchronous with the engine speed. Here, the maximum tolerable engine speed is set, for instance, at 6,300rpm. Under the state that an engine 12 is operated at a speed higher than 6,000rpm a prescribed value lower than the maximum tolerable speed, the rate of omitting the fuel injection pulses is predetermined according to the exceeding rate, and the engine output is restricted by omitting fuel injection according to the exceeding rate. Thus, since the engine output is reduced gradually in the vicinity of the maximum tolerable engine speed, abrupt engine brake is not acted, so that safe operation of the engine is ensured. |
