DAF Euro-4 heavy-duty diesel engine with TNO EGR system and CRT particulates filter
DAF Euro-4 heavy-duty diesel engine with TNO EGR system and CRT particulates filter
复制标题
带 TNO EGR 系统和 CRT 颗粒过滤器的 DAF Euro-4 重型柴油发动机
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
M. Verkiel
中科院分区：
文献类型：
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作者：
R. Verbeek;M. V. Aken;M. Verkiel
本文报道了在一台355 kW发动机上进行的TNO文丘里EGR系统和约翰逊Matthey CRT微粒捕集器的研究。结果表明，EGR-CRT组合是实现EURO-4排放水平的有效手段，同时保持良好的燃油经济性。对EGR策略、喷油正时和空燃比进行了优化，使发动机在大部分工况下都能获得良好的再生条件。此外，瞬态EGR控制被优化以将ETC期间的低NOx排放与良好的驾驶性能和良好的发动机排出颗粒物排放相结合。研究了CRT中氧化催化剂的尺寸。似乎较大的氧化催化剂在低温工作循环期间显示出更好的再生性能。较大的氧化催化剂的负面方面是增加的成本和增加的NO排放（因为催化剂能够将更多的NO氧化成NO）。为了确保在所有情况下的再生，它被发现有必要制定一个积极的再生控制策略。当检测到高背压时，该策略将暂时增加排气温度和NOx-PM比。EGR-CRT系统安装在卡车上，以研究其性能和耐久性在实践中。
This paper reports on a study of the TNO venturi EGR system and the Johnson Matthey CRT particulates trap on a DAF 355 kW engine. The results obtained indicate that this EGR-CRT combination is an effective means to achieve EURO-4 emission level, while maintaining good fuel economy. EGR strategy, injection timing and air-fuel ratio were optimized in such a way that good regeneration conditions were obtained across most of the engine operating map. Also transient EGR control is optimised to combine low NOx emission during the ETC with good driveability and good engine out particulates emission. The size of the oxidation catalyst in the CRT was investigated. It appeared that the larger oxidation catalyst showed a better regeneration performance during a low temperature duty-cycle. Negative aspects of a larger oxidation catalyst are increased costs and increased NOemission (because of the catalyst ability to oxidize more NO into NO). In order to secure regeneration under all circumstances it was found necessary to develop an active regeneration control strategy. This strategy will temporarily increase exhaust temperature and NOx-PM ratio when a high back pressure is detected. The EGR-CRT system is installed in a truck to investigate its performance and durability in practise.