摘要
针对包含外部废气再循环(EGR)的汽油机爆震预测模型进行研究,通过一搭载外部冷却EGR系统的2.0,L增压直喷汽油机进行了高负荷工况下不同EGR率的爆震试验.在此基础上,评估了获得广泛应用的Douaud-Eyzat爆震模型在无EGR和有EGR工况下爆震发生时刻的预测性能,并利用遗传算法,基于Livengood-Wu积分公式提出了考虑外部EGR影响在内的新的爆震发生时刻预测模型.结果表明:Douaud-Eyzat模型在EGR率小于5%的工况下,具有较好的爆震预测性能,但随着EGR率的增加,模型计算的爆震起始点与试验值之间的误差也越来越大;提出的考虑EGR影响在内的爆震预测模型,不仅在无EGR工况下显示了较好的预测性能,而且在EGR率为2%~25%内均实现了较好的爆震预测性能.
To investigate the knock prediction model with consideration of external cooled exhaust gas recirculation(EGR),the knock combustion experiments with different EGR rates were conducted in a2.0,L boosted spark-ignition direct-injection(SIDI)gasoline engine. On the basis of the experiment data,the performance of Douaud-Eyzat knock model,which has been widely used in engine development,was evaluated under engine operating conditions with and without EGR. A new knock onset model based on Livengood-Wu correlation considering the EGR was proposed using the genetic algorithm. Results show that Douaud-Eyzat model provides good knock prediction performance for the cases of EGR rate less than 5%,however,the knock onset error between model prediction and experimental result becomes more significant with the increase of EGR rate. The proposed new knock model not only provides good knock onset prediction in the cases without EGR,but also provides good knock onset prediction over a wide EGR rates ranging from 2% to 25%.
出处
《内燃机学报》
EI
CAS
CSCD
北大核心
2014年第5期443-447,共5页
Transactions of Csice
基金
国家自然科学基金资助项目(51376119)
关键词
缸内直喷汽油机
爆震模型
废气再循环
spark-ignition direct-injection engine
knock model
exhaust gas recirculation(EGR)
