【作者】

Fredrik Östman

【摘要】

该论文已在赫尔辛基举行的第28届CIMAC大会上发表，论文的版权归CIMAC所有。For combustion engines, performance and safe operation are largely a function of the maintenance quality of the engine and related systems. Some faults are inherently more critical than others and often also dependent on the operating conditions. Fault identification, isolation and assessment facilitate decision making, whether to reschedule the needed maintenance and continue operation, potentially on a different operating point, or stopping the engine immediately to repair the fault. To manually assess the fault situation requires extensive skills and experience of combustion engines and is typically only possible to do after the fault event has occurred. Historical trends of measurements can be used, but usually these are on a very low time resolution, which is not sufficient for rapidly progressing faults. Within the automotive industry, fault diagnostic methods, i.e. automatic fault identification and isolation that is embedded in the engine control system, have been used for over two decades with good results. Many different methods have been applied, but model-based fault diagnostics can be regarded as one of the most promising approaches within this industry. However, as automotive engines are highly standardized with high sales volumes, the additional cost of maintaining models and parameters for a large set of models becomes insignificant. In contrast, for large medium- and low-speed engines, the volumes are low and the ratio of variants to total sales is typically high. To overcome this situation, new fault diagnostic approaches need to be considered with the target to reduce the parameter management problem, while still securing the quality of the diagnostics. In this paper, the opportunity and value of fault diagnostics of large medium-speed engines will be discussed. Practical aspects will moreover be highlighted along with a set of fault diagnostics case studies for specific sensors and actuators. Test results from full-scale engine tests will be provided for evidence of the performance of the fault diagnostics methods.

【会议名称】

第28届CIMAC会议

【会议地点】

芬兰 赫尔辛基

【下载次数】

2

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