Research And Development Of Control Response Model For High Pressure Common Rail Diesel Engine

The controlling of internal combustion engine is faced with enormous challenges to meet the increasingly stringent emission regulations,reduce the emissions and improve the engine power and economy performance.Electronic control technology of the high pressure common rail diesel engine is researching but no breakthrough.Development,testing,calibration and verification of control strategy throughout the entire development process of electronic control unit,and the result of control strategy parameters calibration and optimization directly affect the running performance of engine.Therefore,according to the control oriented response model for calibration to research and development a new technical routes by model-in-the-loop(MIL),realizing the model based development results seamless with real engine control,with important practical significance and theoretical value to improve the technical level of internal combustion engine research and development.Combined with the target of control oriented response model for calibration research and the achievements has acquired in domestic and foreign researchers,Systems analysis the development trend in the internal combustion engine modeling and calibration,Not only innovated a virtual engine(LabEngine)based on the physical concept but also analyzed and designed the LabEngine architecture and framework,comparative study the difference of the real engine and model,designed software architecture to produce real sensor and actuator signal of the LabEngine models and put forward the corresponding technical criterion specification.Modular analysis input and output Interface,function and Realization in engine subsystem includes air system,fuel injection system and combustion system,friction system and emission system so that Designed and implemented the control oriented response model subsystems,respectively.Turbocharge Inter-cooled air system model including EGR,aftertreatment designed by iteratively solving the physical equations obtained state variables.In-cylinder combustion system design calculation model of the thermal process of different strokes and the combustion integrate Vibe function heat release rate curve and Hiroyasu model;dynamic calculation of internal friction based on the Coulomb law that calculate kinetics of piston,connecting rod and main bearing,and then calculate the stress and friction power;The concentration of NOx emission calculated according to Extended Zeldovich mechanism model of wide application.Particulate matter according to semi-empirical formula in Quasi-dimensional multi zone model.In addition to the engine model of self-development,also the design and implementation of scalable LabEngine platform to realize the simultaneous mode of commercial software,modeling software such as Simulink,AMEsim and GT-power is integrated into the joint operation of LabEngine,unified platform the integrate formation virtual engine of multi software joint development.Solved the problems in difficulty of the engine modeling,accuracy requirements are not recognized and model a wide variety.Designed and developed a model-in-the-loop calibration software support ASAM-MCD-2MC standard,analyzed and developed the parser of the electronic control unit(ECU)data description file,the corresponding three kinds of formats data file,such as HEX,S19 and PAR,support that the seamless interface from the optimization data of model-in-the-loop calibration to ECU in the real engine.The ways of pre-calibration to optimize the control strategy parameter in the early development to get relative optimistic data,reduce the experiment workload and improve the efficiency of calibration.For implementation and verification that the LabEngine specific engine model can meet the needs of control and calibration has tested 120 data points of the space filling design of experiment(DoE).Calibration based on model-in-the-loop and optimization the MAP of main injection advance angle and rail pressure set value,then downloaded the MAP data to ECU.Compared the test data,verified calibration method and technical route has research significance and practical value by model-in-the-loop pre calibration and virtual calibration is applied to engine development.