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Reducing NOx emissions from engines while maximizing fuel economy

机译:减少发动机的NOx排放,同时最大限度地提高燃油经济性

摘要

Exhaust gas recirculation and selective catalytic reduction with urea or other NOx- reducing reagent are employed to enable good fuel economy and low emissions from diesel and lean-burn gasoline engines. EGR is operated at low-load, as well as when problems are experienced with reagent supply or the SCR unit. The SCR is run at its optimum operating conditions of normal to high load, supplanting the need for EGR. The net effect is a circumvention of the known tradeoff between NOx and poor fuel economy. The novel application of SCR and EGR in combination will provide engines that meet low emissions requirements with existing technology.
机译:废气再循环和使用尿素或其他NOx还原剂的选择性催化还原技术可实现良好的燃油经济性,并降低柴油机和稀燃汽油机的排放。 EGR在低负荷下以及试剂供应或SCR装置出现问题时运行。 SCR在正常负载到高负载的最佳运行条件下运行,从而取代了对EGR的需求。最终结果是规避了氮氧化物与不良燃油经济性之间的已知权衡。 SCR和EGR的新颖结合应用将提供使用现有技术满足低排放要求的发动机。

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