考虑多参数影响的增压发动机现象学爆震预测模型

发布时间：2018-03-29 08:30

  本文选题：内燃机　切入点：爆震模型　出处：《内燃机工程》2016年04期

【摘要】：针对发动机概念设计一维性能仿真优化阶段爆震约束问题,使用末端混合气自着火延迟期积分法,提出一个同时考虑温度、压力、废气再循环(EGR)率和空燃比影响的爆震预测模型。在一台带冷却EGR系统的增压汽油机上进行爆震试验,使用滤波法和图像处理方法提取爆震特征。采用绝热压缩求解每个爆震循环末端混合气温度,并探讨比热比的影响及比热比求解方法对末端混合气温度的影响。结合多岛遗传算法对爆震模型系数进行标定,并与经典模型就预测性能进行对比。结果表明,提高进气温度或加浓混合气都会减小混合气比热比,而引入冷却EGR则会增加混合气比热比。采用定比热比得出的末端混合气温度会大幅高于变比热比得出的末端混合气温度。Douaud模型预测误差随EGR率增加而增大,而考虑多参数影响的爆震模型预测性能较好。
[Abstract]:Aiming at the detonation constraint problem in one-dimensional performance simulation optimization stage of engine conceptual design, a method of end-mixture self-ignition delay period integration is proposed, which takes temperature and pressure into account at the same time. Detonation prediction model of EGR rate and air-fuel ratio. Detonation test was carried out on a turbocharged gasoline engine with cooling EGR system. The method of filtering and image processing is used to extract the detonation feature, and the adiabatic compression is used to solve the mixture temperature at the end of each detonation cycle. The influence of specific heat ratio and the effect of specific heat ratio solution on the temperature of terminal gas mixture are discussed. The coefficient of detonation model is calibrated with multi-island genetic algorithm, and the prediction performance is compared with that of classical model. Increasing the inlet temperature or increasing the mixture concentration will reduce the specific heat ratio of the mixture. When the cooling EGR is introduced, the specific heat ratio of the mixture will be increased. The prediction error of the terminal mixture temperature obtained by using the constant specific heat ratio will be much higher than that of the terminal mixture temperature with variable specific heat ratio. The prediction error of the model increases with the increase of the EGR ratio. The prediction performance of the detonation model considering the influence of multiple parameters is better.
【作者单位】： 上海交通大学汽车电子控制技术国家工程实验室;
【基金】：教育部博士点基金项目(20120073120059) 上海市浦江人才计划项目(13PJ1404300)
【分类号】：U464
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本文编号：1680342