초록 ▼

An apparatus detects trouble states in a gas engine in which the exhaust gas pressure after combustion in each cylinder is measured by a pressure sensor installed on a collecting exhaust pipe. An average value of the exhaust pressure, a standard deviation and a fluctuation values of the average valu

An apparatus detects trouble states in a gas engine in which the exhaust gas pressure after combustion in each cylinder is measured by a pressure sensor installed on a collecting exhaust pipe. An average value of the exhaust pressure, a standard deviation and a fluctuation values of the average value in each cylinder is calculated. Based on the calculated data, it is specified whether the trouble occurring in the gas engine corresponds to a misfire, a leakage in the inlet value or a leakage in the outlet valve, as well as which cylinder is the cause of the problem.

대표청구항 ▼

[ What is claimed is:] [1.] An apparatus for detecting trouble states in an engine including a plurality of cylinders, the apparatus comprising:pressure sensing means for measuring exhaust pressure values exhausted from the engine;sampling means for sampling the exhaust pressure values measured by t

[ What is claimed is:] [1.] An apparatus for detecting trouble states in an engine including a plurality of cylinders, the apparatus comprising:pressure sensing means for measuring exhaust pressure values exhausted from the engine;sampling means for sampling the exhaust pressure values measured by the pressure sensing means during a predetermined time interval;first calculation means for calculating a representative value of the exhaust pressure values of every cylinder based on the exhaust pressure values sampled by the sampling means;second calculation means for calculating a standard deviation of the representative values calculated by the first calculation means;third calculation means for calculating a fluctuation value between representative values obtained in the cylinders an ignition order thereof being neighbored;first judgement means for judging whether the trouble state occurs in the engine by comparing the standard deviation with a first value;second judgement means for judging whether the trouble state occurring in the engine is misfire by comparing the standard deviation with a second value when judged that the trouble state occurs in the engine by the first judgement means; andthird judgement means for judging whether the trouble state occurring in the engine is inlet valve leakage or exhaust valve leakage by comparing a maximum fluctuation value with a third value when judged that the trouble state occurring in the engine is not the misfire.