A Study of SCR System Control Strategies on A Diesel Engine
Selective catalyst reduction (SCR) had been mentioned as a promising technology to reduce nitrogen oxide (NOx) on diesel engines. This paper introduces a set of self-designed and developed urea-SCR system and focus on the control strategies study of SCR system for National IV Diesel Engine. The urea injection control strategy on steady-state conditions is studied and the effective factors of urea injection are studied, including solution temperature, load step, and the delay of mechanical system. Urea injection flow calibration tests are carried out, and the effect of injection cycle, injection frequency, rail pressure, and air-assisted injection system on urea is analyzed. The engine bench tests showed that the performance of urea-SCR after treatment system was affected by many factors like the pressure of air-blast, the temperature of catalyst, the temperature of urea and so on. The test was performed according to the European Steady State Cycle (ESC), the NOx emission of the Diesel Engine which used the control strategy decreased by about 50%. In this way, the National III Diesel Engine can be upgraded to National IV.
Wei LIN Qing YANG outong ZHANG
Department of Power Engineering and Engineering Thermophysics, School of Machinery and Vehicles, Beijing Institute of Technology, Beijing, China
国际会议
The 4th International Conference on Mechanical Engineering and Mechanics(第四届国际机械工程与力学会议)
苏州
英文
762-767
2011-08-11（万方平台首次上网日期，不代表论文的发表时间）