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Optimized Exhaust After-Treatment System Solution for Indian Heavy Duty City Bus Application - The Challenges Involved and the Right Approach to Meet Future BS VI Emission Legislations and Real World Driving Emissions
ISSN: 0148-7191, e-ISSN: 2688-3627
Published January 9, 2019 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
The vehicular pollution and emission levels are alarmingly increasing in India. The metro and urban cities are worst hit by the gaseous and particulate emissions produced by internal combustion engine powered vehicles. Following the trend from other developed countries, Government of India (GOI) has decided to migrate from existing BS IV legislation directly to BS VI legislation from April 2020 all across India. This migration in emission legislation took almost 10 years to be implemented in European Union (EU) countries. However, for India, the targeted implementation time is just 3 years, making it an uphill challenge for all the vehicle manufacturers. City bus is one such applications, which run mostly within the city and currently are powered by conventional Diesel engines. The vehicle manufacturers should focus on finding an optimized solution for meeting the future emission legislation in true sense. This calls for meeting the emission limits with not only the legislative engine dynamometer cycles but also considering the real world driving cycle (RDE) in their solution.
The study presented here involves finding the optimized solution for engine and exhaust after-treatment system (EATS) for the city bus application to meet future BS VI emission regulations. The focus was to not only meet the emission specific drive cycles like WHTC & WHSC, but also evaluate and optimize the solution for real world driving emission cycle (RDE). Although it should be noted, that there is no direct regulation for heavy-duty commercial vehicle with RDE cycles as compared to the light duty Diesel segment, but the vehicle manufacturers have to ensure that the system performance with respect to emission in worst-case real life scenario is always protected and achieve a reasonable Conformity Factor (CF). For this study, a RDE cycle specifically for city bus application has been developed in Mumbai city, capturing the real driving scenario in typical metro Indian cities, with many start stops and low vehicle velocity operations. With such a vehicle duty cycle, typical Selective Catalyst Reduction (SCR) based solution for these heavy-duty application will be impacted with delayed light-off and lower conversion efficiencies. Different heating strategies like late post injections, variable valve timing, intake throttling, hydro carbon dozer, electric heated catalysts etc. has been also analyzed in the presented study. Different EATS layouts involving DOC, DPF, SCR etc. have been simulated and optimized with respect to system performance and total fluid consumption (Fuel and AdBlue) to arrive at the best solution for this segment. FEV has an internally developed mean value based simulation platform to optimize the complete powertrain along with the EATS. This simulation tool has been used to simulate the different engine dynamometer based emission cycles and the selected RDE cycle with different EATS layouts and heating strategies. In addition, as part of this study to achieve in-cylinder emission reduction, the engine level modifications needed for the current BS IV engines has also be detailed and analyzed. This will also provide an insight into any new engine developments for this segment by the manufactures.
This study provide the Indian manufacturers a direction to meet the future stringent emission legislation for the city bus application (heavy commercial segment) not only for meeting the mandated emission specific cycles on engine dynamometer but also with the real life driving cycle (RDE). The study achieves system optimization in terms of real life emission, system cost and fluid consumption reduction, which will be very critical and deciding factor for improving the manufacturer’s presence into the Indian market in future.
CitationEmran, A., Ehrly, M., Sandhu, R., Santhoji Kale, R. et al., "Optimized Exhaust After-Treatment System Solution for Indian Heavy Duty City Bus Application - The Challenges Involved and the Right Approach to Meet Future BS VI Emission Legislations and Real World Driving Emissions," SAE Technical Paper 2019-26-0139, 2019, https://doi.org/10.4271/2019-26-0139.
Data Sets - Support Documents
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- Bhardwaj, O., Blanco, D., Krishnamurthy, K., and Holderbaum, B. , “Optimization of Engine Efficiency and Diesel After treatment System Architecture Using an Integrated System Simulation Approach,” SAE Technical Paper 2016-28-0227 , 2016, doi:10.4271/2016-28-0227.
- Schmid, J., Zarikos, I., Terzis, A., Roth, N., et al. , “Crystallization of Urea from an Evaporative Aqueous Solution Sessile Droplet at Sub-Boiling Temperatures and Surfaces with Different Wettability.”
- Rosefort, Y., Wiartalla, A., Kwee, H., and Pischinger, S. , “Exhaust-After treatment Integrated, DoE based Calibration,” SAE Technical Paper 2012-01-1303 , 2012, doi:10.4271/2012-01-1303.
- Pischinger, S. , “Lecture Notes - Internal Combustion Engines Volume II,” Sixth Edition, Aug. 2013.
- Pischinger, S., Honardar, S., and Deppenkemper, K. , “Potentiale von Ladungswechselvariabilitäten,” Final Report FVV Research Project No. 1027, Book 1034-2013.
- Kopp, Ch. , “Variable Ventilsteuerung für PKW-Dieselmotoren mit Direkteinspritzung,” Dissertation, University of Magdeburg, 2006.
- Deppenkemper, K., Özyalcin, C., Ehrly, M., Schoenen, M. et al. , “1D Engine Simulation Approach for Optimizing Engine and Exhaust Aftertreatment Thermal Management for Passenger Car Diesel Engines by Means of Variable Valve Train (VVT) Applications,” SAE Technical Paper 2018-01-0163 , 2018, doi:10.4271/2018-01-0163.
- Pischinger, S., Körfer, T., Wiartalla, A., Schnitzler, J. et al. , “Combined Particulate Matter and NOx Aftertreatment Systems for Stringent Emission Standards,” SAE Technical Paper 2007-01-1128 , 2007, doi:10.4271/2007-01-1128.
- Ragupati, S.R. and Emran, A. , “Optimization of Exhaust After-Treatment System (EATS) to BS VI Emission Level for a Light Commercial Vehicle (LCV) Using Existing BS IV Engine Results and 1-D Simulation Approach,” SAE Int. J. Engines 10(1):72-80, 2017, doi:10.4271/2017-26-119.
- Chatterjee, S., Naseri, M., and Li, J. , “Heavy Duty Diesel Engine Control to Meet BS VI Regulations,” SAE Technical Paper 2017-26-0125 , 2017, doi:10.4271/2017-26-0125.
- Hallstorm, K. and Shah, S. , “Emission Control Options and Optimization for BSVI Heavy Duty Diesel Applications,” SAE Technical Paper 2017-26-0120 , 2017, doi:10.4271/2017-26-0120.
- Fontaras, G., Rexeis, M., Dilara, P., Hausberger, S. et al. , “The Development of a Simulation Tool for Monitoring Heavy-Duty Vehicle CO2 Emissions and Fuel Consumption in Europe,” SAE Technical Paper 2013-24-0150 , 2013, doi:10.4271/2013-24-0150.
- Cavina, N., Mancini, G., Corti, E., and Moro, D. , “Thermal Management Strategies for SCR After Treatment Systems,” SAE Technical Paper 2013-24-0153 , 2013, doi:10.4271/2013-24-0153.
- Herrmann, O., Biglia, M., Yasuda, T., and Visser, S. , “Diesel Powertrain Energy Management via thermal Management and Electrification,” SAE Technical Paper 2017-01-0156 , 2017, doi:10.4271/2017-01-0156.
- Gorsmann, C. , “Improving Air Quality while Reducing the Emission of Greenhouse Gases,” in SAE 2014 Heavy-Duty Diesel Emissions Control Symposium.
- Nylund, N., Erkkila, K., and Hartikka, T. , VIT Research Notes 2373, “Fuel Consumption and Exhaust Emissions of Urban Buses.”
- Zhang, S., Wu, Y., Huang, R., Yang, L. , et al., “Real-World Fuel Consumption and CO2 Emissions of Urban Public Buses in Beijing", Applied Energy 113 2014 1645-1655
- Alvares, O. , “A Comprehensive Policy & Technology Strategy for Migrating E missions from Heavy-Duty Vehicles in Brazilian Urban Centers”, in Strategies for Migrating Air Pollution, Centro Historico, Ciudad de Mexico-Mexico, Jan. 18-19, 2017.
- “Document on Test Method Testing Equipment and Related Procedures for Testing Type Approval and Conformity of Production (COP) of Vehicles for Emission as per CMV Rules 115, 116 and 126,” Draft AIS-137 (Part 4)/D0, Jan. 2017.
- Ramesh, A.K., Gosala, D.B., Allen, C., Joshi, M. et al. , “Cylinder Deactivation for Increased Engine Efficiency and Aftertreatment Thermal Management in Diesel Engines,” SAE Technical Paper 2018-01-0384 , 2018, doi:10.4271/2018-01-0384.
- http://www.mep.gov.cn/gkml/hbb/bgth/201610/t20161017_365634.htm, accessed Aug. 2018.