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    • Simulation of Engine Start Process Optimization of Power-Split Hybrid Electric Vehicles
    DOI：10.13949/j.cnki.nrjgc.2022.04.006
    Key Words:hybrid electric vehicle  transient simulation  optimization of engine start  injection control strategy
    Author NameAffiliationE-mail
    CHEN Daxin* State Key Laboratory of Engines， Tianjin University， Tianjin 300072， China chendaxin@tju.edu.cn 
    CHEN Tao* State Key Laboratory of Engines， Tianjin University， Tianjin 300072， China tao.chen@tju.edu.cn 
    QIN Tang State Key Laboratory of Engines， Tianjin University， Tianjin 300072， China  
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    Abstract:A detailed engine model based on detailed mechanism was built by GT-SUITE. A mathematical model of three-phase permanent magnet synchronous motor（PMSM） and its magnetic weakening control system were built by MATLAB/Simulink. By solving cross-platform torque transfer and step coordination problems， a hybrid electric vehicle（HEV） transient simulation platform coupled with the two sides was established. The influence of engine initial fuel injection speeds on the energy consumption， starting time and ride comfort during starting process was studied， and the relationship between vehicle demand power and economic initial fuel injection speed was summarized. The results show that the starting time can be reduced when the engine is towed backward above 800 r/min to start injection. There is a negative correlation between the jerk and the establishment time of engine torque. The minimum comprehensive energy consumption corresponding to the initial fuel injection speed is proportional to the required power during starting. The energy consumption can be reduced by 20%~31% compared with the fixed initial injection of 800 r/min.
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