To provide a four cycle engine provided with a plurality of cylinders capable of accurately detecting only misfire causing a problem for continuation of operation of the engine and appropriately executing a process after misfire occurrence in lean premixed combustion engines such as gas engines, and method for operating the engine.
The multiple cylinder four cycle engine is provided with a rotation pulse number detector detecting rotation pulse number of a crankshaft, and a misfire controller calculating average rotation speed of the crankshaft from rotation pulse number detection value of the crankshaft and rotation pulse number per one rotation of the crankshaft, calculating rotation speed deviation which is a difference between average rotation speed of a cycle and average rotation speed of one cycle before the cycle, and judging misfire of the engine if the calculation value of a rotation speed drop quantity exceeds an allowable rotation speed drop quantity setting.
MURAKAMI AKITO
NAGASAWA JO
| JPH07119536A | 1995-05-09 | |||
| JPH0533717A | 1993-02-09 | |||
| JP2003286894A | 2003-10-10 |
Hiroshi Matsumoto
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