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.
2
阐述了降低排放的关键技术，包括缸内控制、废气再循环、可变涡轮增压、4气阀、共轨和排气后处理技术。
The key technologies to lower the exhaust emission, included the in-cylinder control, exhaust gas recirculation, variable geometry turbo, 4-valve, common rail and after-treatment are presented.
3
另外，由于采用外部排气再循环，从而实现了低nox的排放。
In addition, low NOX exhausting is realized by recirculation of external exhausting.
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