Engine

An engine comprising:

• an engine base having a plurality of cylinders and a supercharger;
• an engine rotation speed detection means;
• a supercharger rotation speed detection means that detects rotation of the supercharger as a pulse;
• an operation means that divides the pulse by an optional dividing ratio and calculates it as a divided pulse;
• and
• a control means that regulates fuel injection amount, wherein
• the control means sets the divided pulse divided by a predetermined dividing ratio as a first divided pulse, sets a predetermined position of a piston of each of the cylinders in a crank angle of the engine as count start timing of the first divided pulse, sets the divided pulse, which is operated based on time for counting the divided pulse predetermined number of times from the count start timing of the divided pulse and the predetermined number, as a first output, outputs a second divided pulse divided by larger dividing ratio than the first divided pulse as a second output, judges the cylinder that difference between the first output and the second output to be a fuel injection amount mismatching cylinder, and regulates fuel injection amount of the fuel injection amount mismatching cylinder so as to make the difference not more than predetermined value.

An engine comprising:

• an engine base having a plurality of cylinders and a supercharger;
• an engine rotation speed detection means;
• a supercharger rotation speed detection means that detects rotation of the supercharger as a pulse;
• an operation means that divides the pulse by an optional dividing ratio and calculates it as a divided pulse;
• and
• a control means that judges whether the engine is extraordinary or not and regulates fuel injection amount so as to reduce speed of the engine when the engine is judged to be extraordinary, wherein
• when the engine is judged to be extraordinary, the control means sets the divided pulse divided by a predetermined dividing ratio as a first divided pulse, sets a predetermined position of a piston of each of the cylinders in a crank angle of the engine as count start timing of the first divided pulse, sets the divided pulse, which is operated based on time for counting the divided pulse predetermined number of times from the count start timing of the divided pulse and the predetermined number, as a first output, outputs a second divided pulse divided by larger dividing ratio than the first divided pulse as a second output, and regulates the fuel injection amount so as to make the second output in agreement with the minimum output of the first outputs in one cycle.