Study on emission characteristics of hybrid bus under driving cycles in typical Chinese city

• Published in: IOP conference series. Materials Science and Engineering Vol. 231; no. 1; pp. 12064 - 12072
• Main Authors: Xie, Yongdong, Xu, Guangju
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.09.2017
• Subjects: Alveoli; Emission analysis; Fuels; Particle size; Particle size distribution; Particulate emissions; Pollutants; Test vehicles; Vehicle emissions
• ISSN: 1757-8981; 1757-899X
• DOI: 10.1088/1757-899X/231/1/012064

In this study, hybrid city bus was taken as the research object, through the vehicle drum test, the vehicle emissions of hybrid bus, the transient emissions of gas pollutants, as well as the particle size and number distribution were surveyed. The results of the studies are listed as follows: First, compared to traditional fuel bus, hybrid bus could reduce about 44% of the NOx emissions, 33% of the total hydrocarbon emissions, and 51% of the particles emissions. Furthermore, the distribution of particles number concentration of test vehicle became high in middle and low in both sides. More specifically, the particle number concentration was mainly concentrated in the range from 0.021 to 0.755μm, the maximum was 0.2μm, and particle size of particulate matter (PM) less than 1.2μm accounted for 95% of the total number concentration. Particulate mass concentration was increased with increment of particle size, and the maximum of particulate mass (PM) concentration was 6.2μm. On average, whether traditional fuel bus or hybrid bus, the particle size of particulate matter(PM) less than 2.5μm accounted for more than 98% in the particles emission. It is found that the particles are more likely to deposit to the lung, respiratory bronchioles and alveoli, causing respiratory and lung diseases. Therefore, how to control the PM emissions of hybrid bus is the key factor of the study.