Dual-Fuel Gasoline-Alcohol Engines for Heavy Duty Trucks: Lower Emissions, Flexible-Fuel Alternative to Diesel Engines
Published April 3, 2018 by SAE International in United States
Downloadable datasets for this paper availableAnnotation of this paper is available
Long-haul and other heavy-duty trucks, presently almost entirely powered by diesel fuel, face challenges meeting worldwide needs for greatly reducing nitrogen oxide (NOx) emissions. Dual-fuel gasoline-alcohol engines could potentially provide a means to cost-effectively meet this need at large scale in the relatively near term. They could also provide reductions in greenhouse gas emissions. These spark ignition (SI) flexible fuel engines can provide operation over a wide fuel range from mainly gasoline use to 100% alcohol use. The alcohol can be ethanol or methanol. Use of stoichiometric operation and a three-way catalytic converter can reduce NOx by around 90% relative to emissions from diesel engines with state of the art exhaust treatment.
Alcohol from a second tank is used to provide increased knock resistance at higher values of torque, enabling high compression ratio, turbocharged operation that provides comparable efficiency and torque to a diesel engine in a smaller size engine. The alcohol can be neat or a high concentration blend. It can also be a hydrous alcohol (alcohol and water). Hydrous alcohol use can reduce the fraction of fuel that must be provided by alcohol by knock suppression through evaporative cooling.
We have used computational models to determine minimal alcohol requirements for knock-free operation and to provide illustrative engine parameters for various forms of alcohol and engine operation modes, including upspeeding to reduce alcohol required for knock suppression and use of open-valve port fuel injection to facilitate use of modified SI natural gas or diesel engines as gasoline/alcohol engines.
CitationCohn, D. and Bromberg, L., "Dual-Fuel Gasoline-Alcohol Engines for Heavy Duty Trucks: Lower Emissions, Flexible-Fuel Alternative to Diesel Engines," SAE Technical Paper 2018-01-0888, 2018, https://doi.org/10.4271/2018-01-0888.
Data Sets - Support Documents
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- McCracken, R. , “Diesel Controls at Critical Juncture in Transport,” Global Platts, 4 Apr 2017
- Anderson, S.C., Miller, J., Minares, R., et al. , “Impacts and Mitigation of Excess Diesel-Related NOx Emissions in 11 Major Vehicle Markets”,Nature 545, 467-471, 25 May 2017.
- State of California Air Resources Board (CARB) , “Draft Technology Assessment: Lower NOx Heavy Duty Diesel Engines,” Sept 2015
- California Air Resources Board , “Heavy-Duty Low NOx,” 12 Dec 2017, https://www.arb.ca.gov/msprog/hdlownox/hdlownox.htm .
- Exxon Mobil , “Outlook for Energy: A View to 2040,” http://corporate.exxonmobil.com/en/energy/energy-outlook/2017-highlights/a-view-to-2040, 2017.
- Cummins Westport Press Release , “Cummins Westport Receives 2018 Emissions Certifications for L9N and B6.7N Natural Gas Engines,” 13 Dec 2017.
- Brandt, A.R., Heath, G.A., Kort, E.A., O’Sullivan, F. et al. , “Methane Leaks from North American Natural Gas Systems,” Science 343:733-735, 2014.
- Perfetto, A and Geckler, S. , “Ultra-Low Carbon Powertrain (ETHOS),” Alternative and Renewable Fuel and Vehicle Technology Program, Report CEC-ARV-10-044, Aug 2014.
- Bromberg, L. and Cohn, D. , “Alcohol Fueled Heavy Duty Vehicles Using Clean, High Efficiency Engines,” SAE Technical Paper 2010012199 , 2010, doi:10.4271/2010-01-2199.
- Cohn, D.R., Bromberg, L. & Heywood, J.B. , “MIT Laboratory for Energy and the Environment,” Report LFEE 2005-001.
- Jo, Y., Bromberg, L., and Heywood, J. , “Optimal Use of Ethanol in Dual Fuel Applications: Effects of Engine Downsizing, Spark Retard, and Compression Ratio on Fuel Economy,” SAE Int. J. Engines 9(2):1087-1101, 2016, doi:10.4271/2016-01-0786.
- Ford Motor Company, AVL, and Ethanol Boosting Systems (EBS) , “E85 Optimized Engine,” DOE Project Technical Report Number DE-FC26-07NT43276, 31 Mar 2012
- Cohn, D.R., Bromberg, L. and Heywood, J. , “Fuel Management System for Variable Ethanol Octane Enhancement of Gasoline Engines,” United States Patent 7314033 (2008)
- Stein, R., Anderson, J., and Wallington, T. , “An Overview of the Effects of Ethanol-Gasoline Blends on SI Engine Performance, Fuel Efficiency, and Emissions,” SAE Int. J. Engines 6(1), 2013, doi:10.4271/2013-01-1635.
- McGee, J., Curtis, E., Russ, S., and Lavoie, G. , “The Effects of Port Fuel Injection Timing and Targeting on Fuel Preparation Relative to a Pre-Vaporized System,” SAE Technical Paper 2000-01-2834 , 2000, doi:10.4271/2000-01-2834.
- Anderson, J.E., DiCicco, D.M., Ginder, J.M., Kramer, U. et al. , “Octane Number Ethanol-Gasoline Blends: Quantifying the Potential Benefits in the United States,” FueI 97:585-594, 2012.
- Mehl, M., Pitz, W.J., Westbrook, C.K. et al. , “Kinetic Modeling of Gasoline Surrogate Components and Mixtures under Engine Conditions,” Proceedings of the Combustion Institute 33:193-200, 2011.
- Jo, Y.S., Lewis, R., Bromberg, L. and Heywood, J. , “High Compression Ratio Turbo Gasoline Engine Operation Using Alcohol Enhancement,” Final Report U.S. DOE Project DE-EE0005444, https://www.osti.gov/scitech/servlets/purl/1241492.
- Assessment and Standards Division US EPA Office of Transportation and Air Quality, Greenhouse Gas Emissions Model (GEM) “User Manual: Vehicle Simulation Tool for Compliance with the Proposed Greenhouse Gas Emissions Standards and Fuel Efficiency Standards for Medium and Heavy-Duty Engines and Vehicles: Phase 2,” EPA-420-B-15-076, July 2015.
- BorgWarner , “Turbocharger for an exhaust temperature of 1050°C”, http://www.turbos.bwauto.com/products/turbochargerExhaustTemperature.aspx
- Matsumoto, K., Tojo, M., Jinnai, Y., Hayashi, N. et al. , “Development of Compact and High Performance Turbocharger for 1,050°C Exhaust Gas,” Mitsubishi Heavy Industries, Ltd. Technical Review 45(3), Sep. 2008. http://www.mhi.co.jp/technology/review/pdf/e453/e453001.pdf.
- Reinhart, T. and Megel, M. , “An Efficient, Durable Vocational Truck Gasoline Engine,” SAE Int. J. Engines 9(3), 2016, doi:10.4271/2016-01-0660.
- Heiduk, T., Kuhn, M., Stichmeir, M. , “The new 1.8 L TFSI Engine From Audi, Part 2 Mixture Formation, Combustion and Turbocharging,” MTZ 07-08/2011, vol 72.
- Insenstadt, A. German, J., Dorobantu, M., Boggs, D., et al. “Downsized Boosted Engines,” ICCT Working Paper 2016-16, www.theicct.org/.../Downsized-boosted-gasoline-engines_working-paper_ICCT_2710.
- Anderson, J.E., Kramer, U., Mueller, S.A., and Wallington, T.J. , “Octane Numbers of Ethanol and Methanol-Gasoline Blends Estimated from Molar Concentrations,” Energy & Fuels 24:6576-6585, 2010, doi:10.1021/ef101125c.
- Bromberg, L. and Blumberg, P. , “Estimates of DI Hydrous Ethanol Utilization for Knock Avoidance and Comparison to a Measured and Simulated DI E85 Baseline,” MIT Plasma Science and Fusion Center Report PSFC JA-09-33, http://library.psfc.mit.edu/catalog/reports/2000/09ja/09ja033/09ja033_abs.html.
- Flugge, M., Lewandrowski, J., Rosenfeld, J., Boland, C. et al. , “A Life-Cycle Analysis of the Greenhouse Gas Emissions of Corn- Based Ethanol,” Report prepared by ICF under USDA Contract No. AG-3142-D-16-0243, 30 Jan 2017.
- Bromberg, L. and Cohn, D. , “Ultra-High Efficiency Alcohol Engines Using Optimized Heat Recovery,” US Patent 9,234,482, 2016.