Apparatus for detecting trouble states in engine
AssigneeToho Gas Co., Ltd.
InventorsYoshiharu Ito, Keishi Asano
Life of this patent
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Abstract
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.
Claims18
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;
- and
- third 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.
An apparatus for detecting trouble states in a gas engine utilized in a gas cogeneration system, the gas engine including a plurality of cylinders, the apparatus comprising:
- pressure sensing means for measuring exhaust pressure values exhausted from the gas 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 an average 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 average values calculated by the first calculation means;
- third calculation means for calculating a fluctuation value between values of the standard deviation 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;
- and
- third 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.
Dependencies are inferred from the claim text.