搭载米勒循环发动机的增程式电动车热效率改善研究

杨晓力; 龙兵; 徐宏昌

doi:10.3969/j.issn.1001-2222.2020.05.004

车用发动机 ›› 2020, Vol. 0 ›› Issue (5) : 21-27. DOI: 10.3969/j.issn.1001-2222.2020.05.004

栏目

搭载米勒循环发动机的增程式电动车热效率改善研究

杨晓力¹，龙兵²，徐宏昌³

作者信息 +

Thermal Efficiency Optimization of Miller-Cycle Engine for Extended-Range Electric Vehicle

YANG Xiaoli¹,LONG Bing²,XU Hongchang³

Author information +

文章历史 +

摘要

通过对一款TPFI 发动机的凸轮型线和活塞头部形状的设计，使其变为压缩比为12.5的米勒循环发动机。研究了不同压缩比、机油泵和CLP-EGR技术对米勒循环发动机燃烧特性和热效率的影响。台架试验及仿真结果表明，相比于原型机，外特性最优工况下燃油消耗率从238.6 g/（kW·h）下降到226.5 g/（kW·h），热效率接近37.2%，燃油经济性提升了5.07%。利用Cruise软件建模并设置合适的整车性能参数，获得了两种典型循环工况下的仿真燃油消耗量结果，米勒循环发动机在NEDC工况及CLTC工况中较之原型机分别节油4.4%和4.2%，具有良好的工程应用价值。

Abstract

The cam profile and piston head shape of a TPFI engine were redesigned and the TPFI engine was modified into a Millercycle engine with compression ratio of 12.5. The influences of different compression ratios, oil pump structure and CLPEGR technology on combustion characteristics and thermal efficiency were further investigated. The bench test and simulation results show that the brake specific fuel consumption rate of optimal fullload operation conditions reduces from 238.6 g/（kW·h） to 226.5 g/（kW·h）. Besides, the thermal efficiency is up to 37.2% and the fuel economy improved by 5.07%．Meanwhile, the simulation is conducted by Cruise modeling and setting appropriate vehicle parameters and then the simulation results of fuel consumption under the two typical cycling conditions were acquired. Miller cycle engine saves fuel by 4.4% and 4.2% in NEDC and CLTC legislation condition respectively compared to the original engine, which has good engineering application value.

导出引用

杨晓力，龙兵，徐宏昌. 搭载米勒循环发动机的增程式电动车热效率改善研究[J]. 车用发动机. 2020, 0(5): 21-27 https://doi.org/10.3969/j.issn.1001-2222.2020.05.004

YANG Xiaoli,LONG Bing,XU Hongchang. Thermal Efficiency Optimization of Miller-Cycle Engine for Extended-Range Electric Vehicle[J]. Vehicle Engine. 2020, 0(5): 21-27 https://doi.org/10.3969/j.issn.1001-2222.2020.05.004