engleski

Engine model for onboard marine engine failure simulation

The primary source of the power for marine industry comes from large two stroke low speed marine diesel engines. The more severe emission regulations are forcing the ship owners to use more efficient engines. The electronically controlled engines were introduced which comply with the needs. The electronically controlled engine requires more calibration effort and are mostly based on calibration from the testbed with some environmental condition corrections. In this paper the physical engine model was introduced including AVL Multi-Zone combustion model and self-developed models for turbocharger, charge air cooler, injector and rail model. Typical engine failures were simulated. The demonstrated engine model was based on 6 cylinder large two stroke low speed marine diesel engine and verified with the measurements from the engine testbed. The model calibration was done for the pressure traces and available mean value measurement for 40%, 60% and 100% of engine load. The results show 2-7% of relative deviation of the BMEP, 1-2% relative deviation for in-cylinder peak pressure and almost no deviation in scavenged air pressure. The model showed representative engine behavior and was used for studies on engine failure simulation. The presented engine model can be used for optimization and diagnostic purposes.

Large marine diesel engine ; failure simulation ; diagnostic ; emissions

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