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- 2018
相继增压柴油机废气再循环性能评估及最优决策
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Abstract:
针对增压柴油机废气再循环(EGR)性能评估及最佳EGR率确定问题,提出了一种基于优化多目标灰色决策的评估方法。该方法选取柴油机主要运行参数为决策目标,以不同EGR率下各性能参数的实验数据作为效果样本矩阵,构建初始多目标灰色决策模型;将EGR燃烧与排放性能之间的折衷问题转化为决策模型的目标权重问题,根据增压柴油机不同工况下的EGR特点,采用专家打分初步确定NOx的排放量权重经验指数,通过灰关联分析法求解初始主观权重,并结合熵权法分析求解主客观综合权重,最终建立不等权多目标灰色局势决策优化模型。基于Matlab Guide设计并创建了增压柴油机EGR性能评估及决策仿真平台,仿真结果表明:优化后的模型及仿真平台可以实现不同工况下EGR率的性能评估及最优决策,且有效提高了仿真效率,决策结果较为合理,与目前普遍采用的确定原则基本保持一致,对增压柴油机EGR的优化研究及工程应用具有一定的参考意义。
An evaluation method based on optimizing multi？？objective gray decision is proposed to study the EGR(exhaust gas recirculation) performance evaluation and the determination of optimal EGR rate of turbocharged diesel engines. An initial multi？？objective grey decision model is built by selecting main operating parameters of diesel engines as the decision？？making objects based on the experiment, and taking experimental data of each performance parameter under different EGR rates as the effect sample matrix. The trade？？off problem between EGR combustion and emission performance is converted into an objective weight problem of the decision model. EGR characteristics under different operating conditions of diesel engines are considered, and initial NOx weight indices are determined by expert scoring. An initial subjective weight vector is obtained by gray relational analysis, and then subjective and objective comprehensive weight vectors are obtained by entropy analysis. The multi？？objective gray situation decision？？making optimization model with unequal weights is finally established. A platform for the EGR performance evaluation and decision simulation of turbocharged diesel engines is designed and created based on Matlab Guide. Simulation results show that the optimized model and simulation platform successfully achieve the EGR rate performance evaluation and the optimal decision under different operating conditions. The simulation efficiency is effectively improved and the decision？？making result is more reasonable. The results basically keep the same as those of the commonly used determination principle and have some guidance and reference significances for the optimization research of EGR and engineering applications of turbocharged diesel engines
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