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| Experimental Study on Performance Evaluation of a Diesel Engine Equipped with Diesel Oxidation Catalytic and Catalytic Diesel Particulate Filter System |
| DOI：10.13949/j.cnki.nrjgc.2020.04.003 |
| Key Words:diesel engine diesel oxidation catalytic(DOC) catalytic diesel particulate filter(CDPF) performance evaluation emission regeneration characteristics |
| Author Name | Affiliation | | SHEN Yinggang,LIAO Pinghao,CHEN Chunlin,PENG Yiyuan,XIANG Yihua,CHEN Guisheng | 1.Yunnan Key Laboratory of Internal Combustion Engine, Kunming University of Science and Technology, Kunming 650500, China
2. Kunming Yunnei Power Co., Ltd., Kunming 650501, China |
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| Abstract:In order to study the performance of a diesel engine equipped with diesel oxidation catalytic(DOC) and catalytic diesel particulate filter(CDPF) system, and to explore the change law of the purification efficiency and regeneration characteristics of DOC and CDPF system with the number of test cycles, a diesel plateau test bed was built, and the performance evaluation tests were conducted on 13 test cycles. Results show that at full load, with the increase of the number of test cycles, the engines air intake, torque, power and fuel consumption are slightly lower than the original engine without DOC and CDPF system. At the same time, at the rear-end of the after -treatment system, both smoke and CO emissions tend to be zero, while NO2 emissions increase and NO emissions reduce. Comparing the first test cycle with the thirteenth test cycle, it can be found that the front end temperatures of the DOC and the CDPF are lower than their rear-end temperatures, and the after-treatment system still maintains a higher purification efficiency after 13 test cycles. Compared with the original engine, the mapped performance (maximum torque curve) of the engine with after-treatment system has declined after the performance evaluation test, and the smoke and CO emissions at the rear-end of the after-treatment system still tend to be zero, while the NO2/NO ratio rises first and then falls with increased engine speed. Moreover, the rear-end temperatures of the DOC and the CDPF increase significantly at low speed, and then decrease with increased engine speed until stable, while the pressure difference between the front and rear ends of the CDPF rises first and then falls with increased engine speed. At this time, the capture and regeneration efficiencies remain at a higher level. |
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