Research On Simulation Evaluation Platform Of Key Technology Schemes For Hybrid Engine Based On Fuel Economy

When developing a hybrid engine,it is generally necessary to select a known engine as a prototype engine,and carry a series of advanced key technologies to meet the technical specifications of the hybrid engine to be developed.This paper focused on the analysis,optimization and evaluation of key technologies for hybrid engines.And a fuel economy based hybrid engine key technology schemes simulation evaluation process and distributed platform model were established,which used distributed integration technology,and integrated the prototype engine simulation module,the key technology option module,the optimization module and the evaluation module.In this paper,the framework design of the hybrid engine key technology scheme simulation evaluation platform system was firstly described.According to the functional requirements and characteristics of the evaluation platform,the functional framework of the prototype engine simulation module,the key technology option module,the optimization module and the key evaluation module were described in detail.On this basis,the workflow of the evaluation platform was designed in detail.Based on the platform framework design,the visual interface of each module was established by using MATLAB GUI.The prototype engine simulation module used GT-POWER software and Simulink to establish the engine working process simulation model,which realized the functions of engine parameter input,simulation data processing and data verification.The engine key technology option module gives a series of key technology schemes that may achieve the target effective thermal efficiency according to different technical indicators.These schemes were based on the fuel economy impact of the four key technologies of Miller Cycle,High Compression Ratio,Variable Valve Timing and Exhaust Gas Recirculation,and correlation analysis between these key technologies.The optimization module established the modeFRONTIER optimization simulation model,which performed multi-objective optimization calculation on key technology schemes,and obtained optimization results.The evaluation module used the MATLAB Fuzzy-gray related degree evaluation model to realize the fuzzy evaluation function based on the optimization results of the key technology schemes of the engine.Finally,the application example of BAIC A150TD engine as the hybrid engine key technology schemes simulation evaluation platform was selected,and the simulation modeling,the key technology schemes selection,optimization and evaluation were carried out.The results of the application examples showed that the key technology schemes that meet the technical indicators of 38%effective thermal efficiency were "Miller Cycle+High Compression Ratio","Miller Cycle+High Compression Ratio+VVT","Miller Cycle+High Compression Ratio+EGR","Miller Cycle+High Compression Ratio+VVT+EGR".And the results of the application examples showed that the key technology schemes that meet the technical indicators of 40%effective thermal efficiency were "Miller Cycle+High Compression Ratio+VVT" and "Miller Cycle+High Compression Ratio+VVT+EGR".Different weight setting conditions have different evaluation results.There are 53 figures,22 tables and 88 references in this thesis.