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| Simulation and Analysis of Closed-Loop Control Technology for Medium Speed Marine Diesel Engines Based on In-Cylinder Pressure |
| DOI：10.13949/j.cnki.nrjgc.2019.01.011 |
| Key Words:medium speed marine diesel engine closed-loop control in-cylinder pressure real-time model |
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| Abstract:To eliminate the negative effects of cylinder-to-cylinder unevenness and cycle-to-cycle variation of marine diesel engine on engine performance, vibration and noise, taking a 6L16/24-CR type medium speed marine diesel engine as the research object, an in-cylinder pressure based closed-loop combustion control strategy was investigated with the software-in-loop simulation technology. First, an engine real-time model was established and verified, which was capable of simulating the inhomogeneity of all cylinders and cycle-to-cycle variation. The feedback variables that could indicate the combustion state of each cylinder were extracted from in-cylinder pressure, and a closed-loop combustion control strategy was developed based on the dynamic interaction between the combustion control variables and feedback variables. Next, a software-in-loop simulation platform was built on the base of the engine real-time model, feedback variables, combustion control strategy and fuel injection control variables. Finally, the simulation of the closed-loop combustion control strategy based on in-cylinder pressure was conducted on the platform. The results show that the developed closed loop combustion control strategy based on in-cylinder pressure can meet the combustion control requirements of marine engines, and about 99% of cylinder-to-cylinder unevenness is restrained in the simulation environment. |
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