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Analysis on Emission Characteristics of Urban Buses Based on Remote Online Monitoring
Technical Paper
2021-01-0601
ISSN: 0148-7191, e-ISSN: 2688-3627
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SAE WCX Digital Summit
Language:
English
Abstract
In this study, a new system of assessment method was developed to evaluate the characteristics of urban buses based on remote online monitoring. Four types of buses, including China V emission standards diesel bus, lean-burn CNG bus, air-fuel equivalence ratio combustion CNG bus and gas-electric hybrid bus, were chosen as samples to analyze the emission characteristics of urban buses with different engine types in urban scenario. Based on the traffic conditions in Beijing, the actual emission characteristics of buses under newly-built driving conditions were analyzed. Moreover, the emission factor database of urban buses in Beijing was established to analyze the characteristics of excess emission. The research results are shown as follows. 1) Compared with other types of buses, NOX emission factor and emission rate of lean-burn CNG bus are much higher. The equivalent air-fuel ratio CNG engine combined with TWC catalytic converter and hybrid power technology can better reduce NOX emission. 2) There is difference between the type certification under standard operating conditions and the emission results in actual operation to a varying degree. The evaluation of emission performance based on actual operation can more truly reflect the actual performance of the bus. The BJ-FPC (Beijing flat peak cycle) developed in this paper is closer to the actual operating conditions of the sample bus in terms of VSP Bin proportional distribution. 3) As to weighted NOX emission factors, the BJ-HPC (Beijing high peak cycle) of different types of buses are higher than BJ-FPC and actual operating conditions. 4) Based on the excessive emission method assessment, the NOX of China V diesel bus easily exceeds the emissions limits, and the NOx concentration of lean-burn CNG bus is high, and both the NOx over-limit ratio and the quantity of excessive emission buses are also high. Gas-electric hybrid bus can better reduce the NOX emission and the excessive emission frequency under the urban operating condition.
Authors
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Citation
Feng, Q., Zhen, K., Lu, Y., Yang, X. et al., "Analysis on Emission Characteristics of Urban Buses Based on Remote Online Monitoring," SAE Technical Paper 2021-01-0601, 2021, https://doi.org/10.4271/2021-01-0601.Data Sets - Support Documents
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References
- Johnson , T. , and Joshi , A. Review of Bus Engine Efficiency and Emissions SAE Technical Paper 2017-01-0907 2017 https://doi.org/10.4271/2017-01-0907
- Johnson , T. Vehicular Emissions in Review SAE Int. J. Engines 9 2 1258 1275 2016 https://doi.org/10.4271/2016-01-0919
- Johnson , T. Review of Vehicular Emissions Trends SAE Int. J. Engines 8 3 1152 1167 2015 https://doi.org/10.4271/2015-01-0993
- Johnson , T. Vehicular Emissions in Review SAE Int. J. Engines 7 3 1207 1227 2014 https://doi.org/10.4271/2014-01-1491
- Zhou , H. , Zhao , H. , Feng , Q. et al. Effects of Environmental Parameters on Real-World NOx Emissions and Fuel Consumption for Heavy Duty Diesel Trucks Using an OBD Approach[C] SAE Technical Paper 2018-01-1817 2018 https://doi.org/10.4271/2018-01-1817
- He , W. , Cheng , Y. , Feng , Q. et al. Analysis of Real-World Fuel Consumption Characteristics of Heavy-Duty Commercial Diesel Vehicle Based on OBD Method [C] Materials Science and Engineering 774 012137 2020
- Ortenzi , F. , and Costagliola , M. A New Method to Calculate Instantaneous Bus Emissions Using OBD Data SAE Technical Paper 2010-01-1289 2010 https://doi.org/10.4271/2010-01-1289
- Yang , L. , Zhang , S. , Wu , Y. et al. Evaluating Real-World CO 2 and NOx Emissions for Public Transit Buses Using a Remote Wireless On-Board Diagnostic (OBD) Approach Environmental Pollution 218 453 462 2016 10.1016/j.envpol.2016.07.025
- Shade , B. , Carder , D. , Thompson , G. et al. A Work-Based Window Method for Calculating In-Use Brake-Specific NOx Emissions of Heavy-Duty Diesel Engines SAE Int. J. Engines 1 1 778 793 2009 https://doi.org/10.4271/2008-01-1301
- Ivanič , Ž. , Ayala , F. , Goldwitz , J. et al. Effects of Hydrogen Enhancement on Efficiency and NOx Emissions of Lean and EGR-Diluted Mixtures in a SI Engine SAE Technical Paper 2005-01-0253 2005 https://doi.org/10.4271/2005-01-0253
- Hawirko , J. , and Checkel , M. Real-Time, On-Road Measurement of Driving Behavior, Engine Parameters and Exhaust Emissions SAE Technical Paper 2002-01-1714 2002 https://doi.org/10.4271/2002-01-1714
- Dong , S. , Xiang , X. , Ren , X. et al. Experimental Study on Thermal Balance Performance of Naturally Aspirated Diesel Engine at High Altitudes (Low Air Pressure) Journal of Thermal Science & Technology 10 4 366 370 2011