Emission Characteristics of In-Use Gasoline Vehicle Based on Short Transient Driving Cycle

GAO Dongdong; LUO Maji; LIU Cheng

doi:10.3969/j.issn.1001-2222.2021.01.015

Vehicle Engine ›› 2021, Vol. 0 ›› Issue (1) : 87. DOI: 10.3969/j.issn.1001-2222.2021.01.015

Emission Characteristics of In-Use Gasoline Vehicle Based on Short Transient Driving Cycle

GAO Dongdong，LUO Maji，LIU Cheng

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Abstract

Taking the 2009 Jetta 1.6 L naturally aspirated gasoline engine as the research object, a rotating drum test bench for automobile exhaust gas testing was set up, and the self-developed EGR system and commercially available threeway catalysts were configured. The emission experiments were conducted according to the short transient driving cycle in the legislation of GB 18285-2018 named "Limits and Measurement Methods for Emissions from Gasoline Vehicles under Two-Speed Idle Conditions and Short Driving Mode Conditions". The effects of above-mentioned emission control technologies on emission characteristics of light-duty gasoline vehicle were comprehensively evaluated. The results show that the NO_x emission reduces significantly after the introduction of EGR. The NO_x emission reduces gradually and the CO and HC emissions decrease first and then increase with the increase of EGR valve opening. The CO, HC and NO_x emissions reduce significantly and the CO emission is near to 0 after the using of new three-way catalyst. The combination of three-way catalyst and EGR system also promotes the reduction of harmful pollutant emissions. In the range of 2%-10% EGR valve opening, the NO_x emission reduces significantly and the negative effects of slightly increasing of CO and HC emissions are counteracted due to the purification of threeway catalyst with the increase of EGR valve opening.

Key words

gasoline vehicle / short transient driving cycle / exhaust gas recirculation / catalyst / emission characteristic

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GAO Dongdong，LUO Maji，LIU Cheng. Emission Characteristics of In-Use Gasoline Vehicle Based on Short Transient Driving Cycle[J]. Vehicle Engine. 2021, 0(1): 87 https://doi.org/10.3969/j.issn.1001-2222.2021.01.015