| 摘要 |
A fuel control method for a multi-cylinder engine, a fuel injection amount control method for an engine and an engine operating state discrimination method using the fuel injection amount control method, a propelling device for multiple engine, and a fuel injection control method at a crush astern in an engine with a speed reducing and reversing machine for marine use. The fuel control method for the multi-cylinder engine having a rotation recognizing means recognizing the rotating amount of a crankshaft by cylinders before the combustion cycle of a cylinder concerned. When the injection and supply of a fuel from an injector into the cylinder of the six cylinders are disabled, the number of the cylinders to be recognized by the rotation recognizing means is changed so that the rotating amount of the crankshaft for each of all the six cylinders in which the combustion cycles are continued to each other before the combustion cycle of the cylinder can be recognized. The supply of the fuel of the injector which supplies the fuel to the cylinders having a combustion cycle interval matching that of the cylinder to which the fuel cannot be supplied is controllably stopped so that the combustion cycle intervals between the cylinders on both front and rear sides of the fuel-unsupplied cylinder in the combustion cycle can be uniformed.
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