Exhaust Gas Recirculation for Improved Part and Full Load Fuel Economy in a Turbocharged Gasoline Engine
Exhaust Gas Recirculation for Improved Part and Full Load Fuel Economy in a Turbocharged Gasoline Engine
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DOI：
10.4271/2006-01-0047
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发表时间：
2006-04
期刊：
影响因子：
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通讯作者：
A. Cairns;Hugh Blaxill;G. Irlam
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文献类型：
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作者：
A. Cairns;Hugh Blaxill;G. Irlam
这项工作是关于使用废气再循环，以尽量减少二氧化碳和污染物的排放量在一个广泛的工作范围内的多缸研究发动机。在部分负荷条件下，内部和外部EGR的组合被用来调用受控的自动点火燃烧和改善燃料消耗。在CAI范围之外，通过在火花点火燃烧模式中采用降低的EGR率可以实现小的额外燃料节省。在增压的高负荷条件下，对过量燃料、过量空气和冷却的外部EGR充气稀释进行了比较。很明显，冷却的EGR比过量空气更有效地抑制爆震，燃烧相位进一步朝向最佳提前，并且在更宽的操作范围内实现了改进的燃烧稳定性。EGR的全负荷排放减少潜力也得到了证实，CO2排放减少了17%，发动机排出的HC和CO减少了80%。
The work was concerned with the use of exhaust gas recirculation to minimise CO 2 and pollutant emissions over a wide operating range in a multi-cylinder research engine. Under part-load conditions a combination of internal and external EGR was used to invoke controlled auto ignition combustion and improve fuel consumption. Outside the CAI regime, small additional fuel savings could be made by employing reduced EGR rates in spark ignition combustion mode. At boosted high load conditions a comparison of excess fuel, excess air and cooled external EGR charge dilution was made. It was apparent that cooled EGR was a more effective suppressant of knock than excess air, with combustion phasing further advanced towards the optimum and improved combustion stability achieved over a wider operating range. The full load emissions reduction potential of EGR was also demonstrated, with emissions of CO 2 reduced by up to 17% and engine-out HC and CO decreased by up to 80%.