Characterization of In-Cylinder Techniques for Thermal Management of Diesel Aftertreatment.

Parks, J. E. ; Huff, S. P. ; Kass, M. D. ; Storey, J. M.

Technical Information Center Oak Ridge Tennessee

关键词: Thermal management;    Diesel engines;    Emission;    Catalysts;    Particulates;   

RP-ID  :  DE2008932060

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

One challenge in meeting emission regulations with catalytic aftertreatment systems is maintaining the proper catalyst temperatures that enable the catalytic devices to perform the emissions reduction. In this study, in-cylinder techniques are used to actively control the temperature of a catalyzed diesel particulate filter (DPF) in order to raise the DPF temperature to induce particulate oxidation. The performance of four strategies is compared for two different starting DPF temperatures (150oC and 300oC) on a 4-cylinder 1.7-liter diesel engine. The four strategies include: (1) addition of extra fuel injection early in the combustion cycle for all four cylinders, (2) addition of extra fuel injection late in the combustion cycle for all four cylinders, (3) operating one-cylinder with extra fuel injection early in the combustion cycle, and (4) operating one-cylinder with extra fuel injection late in the combustion cycle. In cases (3) and (4), the cylinder operating with extra fuel injection is changed frequently to avoid oil dilution complications. In addition to the in-cylinder strategies, an in-pipe fuel addition technique for thermal management was studied for comparison.