| EFFECTS OF CATALYST STRUCTURAL PARAMETERS ON THE PERFORMANCE OF EXHAUST GAS AFTERTREATMENT SYSTEM OF DIESEL ENGINES
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| Tan Pi Qiang 1, Li Yun Peng 1, Wang De Yuan 2, Hu Zhi Yuan 1, Lou Di Ming 1 |
1School of Automotive Studies, Tongji University
2China National Heavy Duty Truck Group Co., Ltd. |
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| ABSTRACT |
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To meet increasingly stringent emission regulations, diesel engines must be equipped with DOC, DPF and
SCR. Five performance parameters including system back pressure, HC conversion efficiency, conversion efficiency of NO
to NO2, passive regeneration rate, and conversion efficiency of NO to N2 are very important for DOC+DPF+SCR system.
Nine structural parameters including rDOC, rDPF, rSCR, σDOC, σDPF, σSCR, δDOC, δDPF, and δSCR di rectly a ffect t he f i ve
performance parameters, this paper has carried out a detailed study on it. First, a simulation model of DOC+DPF+SCR
system was established, and calibrated by experiment. Then, simulation was performed on the five performance parameters
under different values of the nine structural parameters. Subsequently, a novel model using random forest algorithm was
established to analyze the correlation between the performance parameters and the structural parameters. The results show
that σDPF has the greatest influence on system backpressure, followed by rDPF. The rDOC has the greatest influence on HC
conversion, followed by σDOC. The rDOC has the greatest influence on conversion of NO to NO2, followed by σDOC. The rDPF
has the greatest influence on DPF passive regeneration rate, followed by rDOC. The rSCR has the greatest influence on
conversion of NO to N2, followed by rDOC. |
| Key Words:
Diesel engine, Exhaust gas aftertreatment system, Structural parameter, Performance parameter, Random forest algorithm, Influence weight
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Corresponding Author.
Tan Pi Qiang , Email. 
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