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Development of a variable resistance-capacitance model with time delay for urea-SCR system
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  • Journal title : Environmental Engineering Research
  • Volume 20, Issue 2,  2015, pp.155-161
  • Publisher : Korean Society of Environmental Engineering
  • DOI : 10.4491/eer.2014.034
 Title & Authors
Development of a variable resistance-capacitance model with time delay for urea-SCR system
Feng, Tan; Lu, Lin;
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Experimental research shows that the nitric oxides () concentration track at the outlet of selective catalytic reduction (SCR) catalyst with a transient variation of Adblue dosage has a time delay and it features a characteristic of resistance-capacitance (RC). The phenomenon brings obstacles to get the simultaneously expected to be reduced and equi-molar ammonia available to SCR reaction, which finally inhibits conversion efficiency. Generally, engine loads change frequently, which triggers a rapid changing of Adblue dosage, and it aggravates the air quality that are caused by emission and ammonia slip. In order to increase the conversion efficiency of and avoid secondary pollution, the paper gives a comprehensive analysis of the SCR system and tells readers the key factors that affect time delay and RC characteristics. Accordingly, a map of time delay is established and a solution method for time constant and proportional constant is carried out. Finally, the paper accurately describes the input-output state relation of SCR system by using "variable RC model with time delay". The model can be used for a real-time correction of Adblue dosage, which can increase the conversion efficiency of in SCR system and avoid secondary pollution forming. Obviously, the results of the work discover an avenue for the SCR control strategy.
Diesel engine;Urea-SCR;Weight analysis;Time delay;Resistance-capacitance;
 Cited by
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