On-Road Gaseous Emission Characteristics of China IV CNG Bus in Shanghai

Abstract:

In this paper, on-road CO, THC, NO_X, CO₂ gaseous emissions characteristics of china IV CNG bus were analyzed based on on-road vehicle emission test in the peak and non-peak hours of city traffic in Shanghai using a portable emission measurement system (PEMS). The experimental results reveal that: compared with the condition results in the non-peak hours, it (conditions in the peak hours) have lower average speed, longer idle time and shorter high speed time; the NO_X emission factor and rate in the peak hour reduced by 5.66% and 70.2%; the CO, HC, CO₂ emissions factors are increased by 47.2%, 32.6%, 20.8%, and the CO, HC, CO₂ emissions rates reduced by 1.94%, 26.5%, 48.7% respectively, compared with that in the non-peak hours; The CO, HC, NO_X, CO₂ emissions factors all decreased as bus speed increased, while they increased as bus acceleration increased; the gaseous emissions rates all increased as bus speed increased; both the emissions factors and emissions rates contributions are highest at accelerations, higher at cruise speeds, and the lowest at decelerations for non-idling buses; the emissions rates under the condition of idling is lowest; gaseous emissions contribution under the various operating conditions has displayed certain correlations with the percentage of the time for different operating conditions.

• Periodical: Advanced Materials Research (Volumes 690-693)
• Pages: 1864-1871
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.690-693.1864
• Online since: May 2013
• Authors: Di Ming Lou, Si Li Qian, Zhi Yuan Hu, Pi Qiang Tan
• Keywords: China Iv Emission Standard, CNG Bus, Gaseous Emission, On-Road, Operation Parameter

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