Research And Design Of Marine Diesel Engine Model For Hardware-in-the-loop Test Platform

Over the past few years, in order to fulfill the demands for diesel powerenhancement as well as the emissions reduction, various controllable technologiesincrease continually. At the same time, the control strategy of engine electroniccontrol unit (ECU) has shown an almost exponential growth in complexity. For thesake of accelerating the development of ECU, improving quality and loweringengineering cost, Hardware-in-the-loop test is used gradually in the development ofECU, which makes the development and test process of ECU much simpler andmore flexible.Hardware-in-the-loop test is validating a real ECU on a virtual engine, so thecore of ECU Hardware-in-the-Loop test platform is designing a real-time dieselworking model with determinate precision.The elaborate diesel working process simulation model has a deadlydisadvantage to consume much calculation time, which makes it dissatisfy therequirement of real-time for a control system. Consequently, model moderatepredigestion is needed depending on the characteristic of different diesels.By comparing various kinds of common control-used model predigestingtheory and considering that the marine diesel engine is characteristic of huge systemsize and high cost test, this paper builds a real-time simulation model of acommon-rail marine diesel, which is a combination of mean value model and“filling and emptying” based on MATLAB/Simulink. Utilizing the modularizationand “cylinder moving” idea improves the model flexibility. At last, a real-timesimulation and verification is performed on the dSPACE platform which is alsoconfigured specially in this paper.It shows that this model has a high accuracy by comparing the off-boardsimulation results with the experiment results. At the same time, the modelcalculating time on dSPACE platform is less than the simulation step size, which indicates that this model satisfies the real-time quality.The result shows that the marine diesel model built by combining the meanvalue model with “filling and emptying”, utilizing the modularization and “cylindermoving” idea can satisfy all the requirements for Hardware-in-the-Loop Simulationand ECU development on the dSPACE Platform. This modeling method is valid andfeasible, and it also could be used in model development process for other hugediesels.