| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel injection control device capable of controlling overshoot/undershoot when controlling actual engine revolution speed to target revolution speed. SOLUTION: The fuel injection quantity control device controls actual engine revolution speed En to target revolution speed Eo. The control device is provided with a deviation arithmetic means 1 for acquiring a deviation (e) by reducing the actual revolution speed En from the target revolution speed Eo, a proportional item arithmetic means 2 for acquiring a proportional item output value Qp by multiplying the deviation (e) by a prescribed proportionality constant Kp, an integral item arithmetic means 3 for acquiring an integral item output value Qi by integrating the deviation (e) by a prescribed integral constant Ki, a differential item arithmetic means 5 for acquiring a differential item output value Qd by multiplying a value obtained by differentiating the deviation (e) by a prescribed differential constant Kd, and an injection quantity arithmetic means 6 for determining the injection quantity by adding the proportional item output value Qp and the integral item output value Qi. The control device contains a correcting means 4 for suppressing excessive decrease in the injection quantity by controlling the lower limit of the integral item output value Qi by the differential item output value Qd when the deviation (e) is negative, and excessive increase in the injection quantity by controlling the upper limit of the integral item output value Qi by the differential item output value Qd when the deviation (e) is positive. COPYRIGHT: (C)2004,JPO&NCIPI
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