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| Emission Characteristics of Fine Particle Number of China Ⅵ Heavy-Duty Engines |
| DOI：10.13949/j.cnki.nrjgc.2022.06.010 |
| Key Words:diesel engine natural gas engine fine particle particle number emission |
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| Abstract:A heavy-duty diesel engine and a heavy-duty natural gas engine that meet the current China Ⅵ emission standard were selected to run hot and cold world harmonized transient cycle（WHTC） on the engine test bench. Fine particle numbers with diameters above 10 nm （PN10） and fine particle numbers with diameters above 23 nm （PN23） were measured at the same time. The results show that the specific emission of PN10 of this diesel engine were 35.3%~105.4% higher than that of PN23. The PN10 specific emissions of the natural gas engine were 84.8%~1 400.0% higher than that of the PN23. The changes of transient emissions of PN10 and PN23 were basically the same. PN emissions of natural gas engine were extremely serious at cold run due to the low exhaust temperature and mixture rich strategy. Especially for natural gas with high calorific value， the PN emission with particle diameter within 10 nm~23 nm accounted for as high as 93.3% in the total PN emission. It is urgent to strengthen the control of fine particle number emissions for natural gas engines. |
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