（2）废气再循环 废气再循环(Exhaust Gas Recirculation-EGR)是将发动机部分排气引回进气管与新鲜空 气混合，二次进入气缸作为工质参加气缸内的热循环。
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Exhaust gas recirculation EGR rate 废气再循环EGR率
EGR Exhaust Gas Recirculation 排气再循环装置 ; 废气再循环
BENZ EGR Exhaust Gas Recirculation 循环再循环体系 ; 循环再循环系统
The key to an EGR system is introduced, and the control of exhaust gas quantity recirculation quantity of that in every point at best.
EGR系统的关键就是控制废气的引入量，使废气的再循环量在每一个工作点都达到最佳状况。
Schemes of variable compression ratio (VCR), variable exhaust gas recirculation (EGR), variable exhaust valve timing, and EGR with stratification by tumble charge flow are recommended.
推荐可变压缩比（VCR）方案、可变废气再循环率（EGR）方案、可变排气门关闭时刻方案，以及废气再循环滚流分层充气方案等。
The annual total cost of optimum design decreased by 20.8% than that of conventional design without EGR, 14.3% than that of conventional design when exhaust gas recirculation ratio was 0.2.
对湿空气出口温度和废气循环比进行优化设计，比无废气循环的常规设计节省年总费用20.8%，比循环比为0.2时的常规设计节省年总费用14.3%。
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