| 摘要 |
PURPOSE:To maintain the idle rotation speed stably, by predicting the following engine rotation speed from the preset engine rotation frequency and the rotation speed variation amount by the probable variation of the operation amount, the combustion, and the load which are preset for the following combustion stroke cylinder. CONSTITUTION:As an idle rotation operational amount of an internal combustion engine A1, the fuel injection quantity, the injection time, the intake air flow, and the like are set or converted by an operation amount variable device A2, and the condition whether there is a variation of the operational condition at specific positions of pistons is detected by an operational condition detecting device A3. Then, the parameters of the operation formulas of an operational amount arithmetic device A5 are corrected one by one in the gradual minimum square, the gradual expansion square, the gradual maximum prediction, and the like, depending on the variation of the operational condition, making into the object rotation speed by a setting device A4, and the feedback amount of the operation amount is output to the operation amount variable device A2. In such a way, the idle rotation speed can be maintained stably near the set value.
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