| 摘要 |
PURPOSE:To secure the safe and smooth operation by executing the fuel cut before a tapper valve system starts bounce in an engine using a hydraulic rush adjustor in the tappet valve system, thus avoiding miss-fire of the engine. CONSTITUTION:An oil quantity sensor 18 is installed into an oil pan 17, and the signal is input into a control unit 15. The engine revolution speed for carrying out the fuel cut corresponding to the oil quantity is obtained in a fuel cut engine revolution speed calculation circuit by the signal, and the injection pulse width is reduced to zero by an injection pulse width calculating circuit by the signal of the obtained engine revolution speed. An injector 8 is controlled on the basis of the signal, and fuel injection is suspended. Since the engine revolution speed in fuel cut is set at most close tol the engine revolution speed on the start of bounce in a tappet valve system which corresponds to the oil quantity, the miss-fire of the engine can be avoided by the fuel cut before the bounce start, and the safe and smooth operation can be secured.
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