This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Assessment through Numerical Simulation of the Impact of a 48 V Electric Supercharger on Performance and CO2 Emissions of a Gasoline Passenger Car
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 02, 2019 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
The demanding CO2 emission targets are fostering the development of downsized, turbocharged and electrified engines. In this context, the need for high boost level at low engine speed requires the exploration of dual stage boosting systems. At the same time, the increased electrification level of the vehicles enables the usage of electrified boosting systems aiming to exploit the opportunities of high levels of electric power and energy available on-board. The aim of this work is therefore to evaluate, through numerical simulation, the impact of a 48 V electric supercharger (eSC) on vehicle performance and fuel consumption over different transients. The virtual test rig employed for the analysis integrates a 1D CFD fast running engine model representative of a 1.5 L state-of-the-art gasoline engine featuring an eSC in series with the main turbocharger, a dual voltage electric network (12 V + 48 V), a six-speed manual transmission and a vehicle representative of a B-SUV segment car. The evaluation tests chosen for the case study were, on the one hand, vehicle elasticity manoeuvres for the performance assessment and, on the other hand, type approval and RDE driving cycles, for the fuel economy assessment. An evaluation of possible engine and vehicle hardware modifications was also carried out. In particular, the effects of a variation of the final drive ratio, of the increase of the turbine size and of the usage of a high efficiency engine concept (featuring an increased compression ratio from 10 to 12 and a late intake valve closing, exploiting the advantages of a Miller cycle) were investigated. The introduction of a 48 V electric supercharger on a gasoline passenger car was shown in the selected test cases to lead to up to 16% reduction of the elasticity time and up to 9% improvement in fuel consumption when the high efficiency engine concept was considered.
CitationZanelli, A., Millo, F., Barbolini, M., and Neri, L., "Assessment through Numerical Simulation of the Impact of a 48 V Electric Supercharger on Performance and CO2 Emissions of a Gasoline Passenger Car," SAE Technical Paper 2019-01-1284, 2019, https://doi.org/10.4271/2019-01-1284.
Data Sets - Support Documents
|[Unnamed Dataset 1]|
|[Unnamed Dataset 2]|
|[Unnamed Dataset 3]|
|[Unnamed Dataset 4]|
|[Unnamed Dataset 5]|
|[Unnamed Dataset 6]|
- Königstein, A., Larsson, P.-I., Grebe, U.D., and Wu, K.-J. , “Differentiated Analysis of Downsizing Concepts,” MTZ Worldwide 69:4-11, 2008-06.
- Leduc, P., Dubar, B., Ranini, A., and Monnier, G. , “Downsizing of Gasoline Engine: An Efficient Way to Reduce CO2 Emissions,” Oil & Gas Science and Technology 58(1):115-127, 2003.
- Luisi, S., Doria, V., Stroppiana, A., Millo, F. et al. , “Experimental Investigation on Early and Late Intake Valve Closures for Knock Mitigation through Miller Cycle in a Downsized Turbocharged Engine,” SAE Technical Paper 2015-01-0760 , 2015, doi:10.4271/2015-01-0760.
- Bao, R., Avila, V., and Baxter, J. , “Effect of 48 V Mild Hybrid System Layout on Powertrain System Efficiency and Its Potential of Fuel Economy Improvement,” SAE Technical Paper 2017-01-1175 , 2017, doi:10.4271/2017-01-1175.
- Bassett, M., Hall, J., Cains, T., Underwood, M. et al. , “Dynamic Downsizing Gasoline Demonstrator,” SAE Int. J. Engines 10(3):2017, doi:10.4271/2017-01-0646.
- Aymanns, R., Uhlmann, T., Nebbia, C. et al. , Auto Tech Rev 3:56, 2014, doi:10.1365/s40112-014-0739-y.
- Kersten, R., Rosenberger, U., Sonner, M., et al. , “Thermodynamic Analysis of the Potential an Inline 4 Gasoline Intake System with Partial Electric Supported Boosting During Acceleration,” (in German), 21st Dresden Supercharging Conference, 2016.
- DIRECTIVE 2007/46/EC, OJ L 263, 9.10.2007, p. 1-160.
- COMMISSION REGULATION (EU) 2017/1151, OJ L 175, 7.7.2017, p. 1-643.
- https://wiki.unece.org/display/trans/Gearshift+calculation+tool, accessed Oct. 31, 2018
- Gamma Technologies Inc., GT-SUITE Engine Performance Application Manual, 2018.
- Millo, F., Di Lorenzo, G., Servetto, E., Capra, A. et al. , “Analysis of the Performance of a Turbocharged S.I. Engine under Transient Operating Conditions by Means of Fast Running Models,” SAE Int. J. Engines 6(2):968-978, 2013, doi:10.4271/2013-01-1115.
- https://www.dieselnet.com/standards/, accessed Oct. 31, 2018.
- Onori, S., Serrao, L., and Rizzoni, G. , Hybrid Electric Vehicles (London: Springer London, 2016), doi:10.1007/978-1-4471-6781-5.
- Breitbach, H., Metz, D., Weiske, S. et al. , Auto Tech Review 5:38, 2016, doi:10.1365/s40112-016-1104-0.
- Rothgang, S., Pachmann, M., Nigrin, S. et al. , Auto Tech Review 5:26, 2016, doi:10.1365/s40112-016-1102-2.
- Douaud, A. and Eyzat, P. , “Four-Octane-Number Method for Predicting the Anti-Knock Behavior of Fuels and Engines,” SAE Technical Paper 780080 , 1978, doi:10.4271/780080.
- Millo, F., Rolando, L., Pautasso, E., and Servetto, E. , “A Methodology to Mimic Cycle to Cycle Variations and to Predict Knock Occurrence Through Numerical Simulation,” SAE Technical Paper 2014-01-1070 , 2014, doi:10.4271/2014-01-1070.
- Coltro, R. , “Experimental Analysis of the Influence of the Propulsion System Characteristics on the Vehicle Manoeuvres Defining Performances and Drivability.” Master of Science Thesis, Politecnico di Torino, 2005 (in Italian).