In this study, the combination of fuel injection parameters and SCR was used to test the material emitted from DME engine combustion under different cylinder conditions by Avl-fire. In order to study the effect of injection pressure and injection time and SCR on engine emissions, the effect of injection DME on engine combustion emissions under the condition that the injection pressure changes continuously from 20 mpa-73 mpa and the injection time from BTDC to ATDC is 15° to ATDC. The study found that when the injection pressure around 38 MPa, NOX, CO and HC emissions of engine exhaust can satisfy the VI emissions requirements; When the injection time within 3.5° BTDC to 3.5° between ATDC, NOX, CO and HC emissions of engine exhaust can satisfy the VI emissions requirements; When affected by complex working conditions and environment, the production of NOX will increase. At this point, with the combination of SCR, the maximum conversion rate of NOX in the exhaust can reach nearly 79%. Through Fuzzy Logic Toolbox of MATLAB/Simulink (Fuzzy Logic Toolbox) engine emissions of Fuzzy inference system (FIS), then it is introduced into the Fuzzy Logic Controller (Fuzzy Logic Controller) in emission control, the simulation results show that under the condition of Fuzzy control, engine NOX emissions of nitrogen oxides, carbon monoxide, CO and HC hydrocarbons under the VI standard 8.9%, 4.0% and 5.0%, so as to improve the diesel car of environmental protection.

中文翻译：

---

基于Avl-fire的二甲醚柴油机排放模糊控制研究

在这项研究中，结合使用燃料喷射参数和SCR来测试在不同气缸条件下通过Avl-fire燃烧DME发动机燃烧排放的物质。为了研究喷射压力和喷射时间以及SCR对发动机排放的影响，在喷射压力从20 mpa-73 mpa连续变化以及喷射时间从BTDC变为ATDC的条件下，喷射DME对发动机燃烧排放的影响与ATDC成15度角。研究发现，当喷射压力约为38 MPa时，发动机排气中的NOX，CO和HC排放可以满足VI排放要求；当BTDC在3.5°BTDC到3.5°之间的喷射时间在BTDC，NOX，CO和HC排放之间时，可以满足VI排放要求；当受到复杂的工作条件和环境的影响时，NOX的产量将增加。此时，结合使用SCR，排气中NOX的最大转化率可达到近79％。通过MATLAB / Simulink的模糊逻辑工具箱（Fuzzy Logic Toolbox）模糊推理系统（FIS）的发动机排放，然后将其引入排放控制的模糊逻辑控制器（Fuzzy Logic Controller），仿真结果表明，在模糊控制，VI标准下发动机NOX排放的氮氧化物，一氧化碳，CO和HC碳氢化合物分别为8.9％，4.0％和5.0％，从而改善了柴油车的环保性。