This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Dynamic Skip Fire Applied to a Diesel Engine for Improved Fuel Consumption and Emissions
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 02, 2019 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
Dynamic skip fire (DSF) is an advanced cylinder deactivation technology where the decision to fire or skip a singular cylinder of a multi-cylinder engine is made immediately prior to each firing opportunity. A DSF-equipped engine features the ability to selectively deactivate cylinders on a cylinder event-by-event basis in order to match the requested torque demand at optimum fuel efficiency while maintaining acceptable noise, vibration and harshness (NVH). Dynamic Skip Fire (DSF) has already shown significant fuel economy improvements for throttled spark-ignition engines. This paper explores the potential benefits of DSF technology in improving fuel economy while maintaining ultra-low tailpipe emissions for light-duty (LD) Diesel powertrains. An analytical model was created using the FEV Complete Powertrain Simulation Platform to conduct a dedicated simulation study of DSF benefits over the Worldwide Harmonized Light Vehicle Test Procedure (WLTP) and a representative Real Driving Emissions (RDE) cycle. The study was conducted on two characteristic vehicle platforms; a mid-size sport utility vehicle (SUV) and a compact, C-segment passenger car. The two Diesel-powered vehicles considered in this analysis each employ a state-of-the-art 2.0-liter, 4-cylinder Diesel engine equipped with high- and low-pressure exhaust gas recirculation (EGR) and a variable geometry turbocharger (VGT). The analysis results obtained so far demonstrate that DSF technology, when applied to a light-duty diesel engine with optimized transmission shift scheduling, can achieve up to 5% fuel economy benefit, while realizing tailpipe nitrogen oxides (NOx) emissions reduction up to 40%. The improved fuel economy is a result of combination of factors, including pumping loss reduction, combustion system efficiency improvement and deceleration cylinder cut-off utilization. The reduction of tailpipe NOx is achieved mainly by improved conversion efficiency in the NOx aftertreatment system due to increased exhaust temperatures with DSF technology.
CitationScassa, M., George, S., Nencioni, M., Chen, S. et al., "Dynamic Skip Fire Applied to a Diesel Engine for Improved Fuel Consumption and Emissions," SAE Technical Paper 2019-01-0549, 2019, https://doi.org/10.4271/2019-01-0549.
Data Sets - Support Documents
|[Unnamed Dataset 1]|
- Ramesh, A., Gosala, D., 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.
- Pillai, S., LoRusso, J., and Van Benschoten, M., “Analytical and Experimental Evaluation of Cylinder Deactivation on a Diesel Engine,” SAE Technical Paper 2015-01-2809, 2015, doi:10.4271/2015-01-2809.
- McCarthy, J., “Cylinder Deactivation Improves Diesel Aftertreatment and Fuel Economy for Commercial Vehicles,” in Internationales Stuttgarter Symposium Proceedings, 2017, DOI:10.1007/978-3-658-16988-6_78
- Gosala, D., Allen, C., Ramesh, A., Shaver, G. et al., “Cylinder Deactivation during Dynamic Diesel Engine Operation,” Proc IMechE International J of Engine Research 18(10):991-1004, 2017, doi:10.1177/1468087417694000.
- Allen, C., Gosala, D., Shaver, G., and McCarthy, J., “Comparative Study of Diesel Engine Cylinder Deactivation Transition Strategies,” Proc IMechE International J of Engine Research 1-11, 2018, doi:10.1177/1468087418768117.
- Zammit, J., McGhee, M., and Shayler, P., “The Influence of Cylinder Deactivation on the Emissions and Fuel Economy of a Four-Cylinder Direct-Injection Diesel Engine,” Proc IMechE, Part D: J Automobile Engineering 228(2):206-217, 2014.
- Yang, J., Quan, L., and Yang, Y., “Excavator Energy-Saving Efficiency Based on Diesel Engine Cylinder Deactivation Technology,” Chin J Mech Eng 25(5):897-904, 2012.
- Lu, X., Ding, C., Ramesh, A., Shaver, G. et al., “Impact of Cylinder Deactivation on Active Diesel Particulate Filter Regeneration at Highway Cruise Conditions,” Front Mech Eng, 2015.
- Kitabatake, R., Minato, A., Inukai, N., and Shimazaki, N., “Simultaneous Improvement of Fuel Consumption and Exhaust Emissions on a Multi-Cylinder Camless Engine,” SAE Int. J. Engines 4(1):1225-1234, 2011, doi:10.4271/2011-01-0937.
- Wilcutts, M., Switkes, J., Shost, M., and Tripathi, A., “Design and Benefits of Dynamic Skip Fire Strategies for Cylinder Deactivated Engines,” SAE Int. J. Engines 6(1):278-288, 2013, doi:10.4271/2013-01-0359.
- Chen, S., Chien, L., Nagashima, M., Van Ess, J. et al., “Misfire Detection in a Dynamic Skip Fire Engine,” SAE Int. J. Engines 8(2):389-398, 2015, doi:10.4271/2015-01-0210.
- Chien, L., Younkins, M., and Wilcutts, M., “Modeling and Simulation of Airflow Dynamics in a Dynamic Skip Fire Engine,” SAE Technical Paper 2015-01-1717, 2015, doi:10.4271/2015-01-1717.
- Eisazadeh-Far, K. and Younkins, M., “Fuel Economy Gains through Dynamic-Skip-Fire in Spark Ignition Engines,” SAE Technical Paper 2016-01-0672, 2016, doi:10.4271/2016-01-0672.
- Fuschetto, J., Eisazadeh-Far, K., Younkins, M., Carlson, S., et al., “Dynamic Skip Fire in Four-Cylinder Spark Ignition Engines: Fuel Economy Gains and Pollutant Emissions Reductions,” in Presented at SAE World Congress 2017, April 4th-6th, Detroit, MI, USA,2017, .
- Chen, S., Mandal, A., Chien, L., and Ortiz-Soto, E., “Machine Learning for Misfire Detection in a Dynamic Skip Fire Engine,” SAE Technical Paper 2018-01-1158, 2018, doi:10.4271/2018-01-1158.
- Ortiz-Soto, E., Wang, R., Nagashima, M., Younkins, M. et al., “λDSF: Dynamic Skip Fire with Homogeneous Lean Burn for Improved Fuel Consumption, Emissions and Drivability,” SAE Technical Paper 2018-01-0891, 2018, doi:10.4271/2018-01-0891.
- Wilcutts, M., Nagashima, M., Eisazadeh-Far, K., Younkins, M. et al., “Electrified Dynamic Skip Fire (eDSF): Design and Benefits,” SAE Technical Paper 2018-01-0864, 2018, doi:10.4271/2018-01-0864.
- 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.