An investigation of diagnosis methods for the torque rich condition of marine diesel engines using the heat release rate and vibration acceleration

This study describes diagnosis methods for the torque rich condition of marine diesel engines. Diagnosis of the torque rich condition of marine diesel engines was carried out using the generally used performance data, heat release rate and the vibration acceleration of the cylinder head. The results obtained from the investigation are as follows: (1) It is difficult to observe the torque rich condition of marine diesel engines in detail using the boost air pressure, fuel oil consumption or exhaust gas temperature. (2) The torque rich condition of marine diesel engines can be observed in greater detail using the heat release rate. (3) By monitoring the vibration acceleration of the cylinder head, the torque rich condition of marine diesel engines can be observed conveniently and accurately.