摘要
为计算可变压缩比技术对柴油机燃油经济性和排放性能的影响,该文通过GT-Power软件,对一台装备有中冷废气再循环系统和可变几何涡轮增压系统的C6.6重型柴油机进行了建模和仿真分析,并采用了直喷燃烧预测模型对模型的有效性进行了验证。研究结果表明,可变压缩比技术使柴油机中、低负荷下燃油经济性的改善可达7.2%,再结合适当的废气再循环(exhaust gas recirculation,EGR)率和可变几何涡轮增压系统(variable geometry turbocharger,VGT)控制策略,柴油机的NOx和颗粒物的排放性能可达到欧洲5号标准瞬态测试循环(european transient cycle,ETC)中的排放要求。因此,可变压缩比技术可以有效改善直喷柴油机的燃油经济性,提高排放性能。
In order to investigate the effect of variable compression ratio （VCR） on fuel economy and emission reduction, a model of the heavy duty diesel engine C6.6 equipped with inter-cooling exhaust gas recirculation （EGR） and a variable geometry turbocharger （VGT） was presented and analyzed based on the GT-Power software and its validity was verified with a predictive direct-injection jet combustion model. The simulation results showed that the use of variable compression ratio improved fuel economy to 7.2% at low and medium load, also NOx and soot emissions could meet the need of Euro V values for ETC with corresponding EGR fraction and VGT strategy. Variable compression ratio can improve the fuel economy and emission performance of direct injection diesel engine effectively.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2012年第4期27-32,共6页
Transactions of the Chinese Society of Agricultural Engineering
