This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Improvement of Practical Electric Consumption by Drag Reducing under Cross Wind
Technical Paper
2016-01-1626
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Reducing vehicle fuel consumption has become one of the most important issues in recent years in connection with environmental concerns such as global warming. Therefore, in the vehicle development process, attention has been focused on reducing aerodynamic drag as a way of improving fuel economy. When considering environmental issues, the development of vehicle aerodynamics must take into account real-world driving conditions. A crosswind is one of the representative conditions. It is well known that drag changes in a crosswind compared with a condition without a crosswind, and that the change depends on the vehicle shape. It is generally considered that the influence of a crosswind is relatively small since drag accounts for a small proportion of the total running resistance. However, for electric vehicles, the energy loss of the drive train is smaller than that of an internal combustion engine (ICE) vehicle. Therefore, drag represents a relatively larger proportion of the total running resistance. That makes it necessary to consider the influence of a crosswind in order to reduce electric power consumption in real-world driving. In this study, representative test conditions taking into account a crosswind were proposed for wind tunnel tests based on an analysis of U.S. market data such as vehicle speeds and wind speeds. The test results made clear the mechanism causing drag to change under the representative test conditions. The representative test conditions were calculated by the Monte Carlo method using real-world driving data. It was found that a yaw angle of 4 degrees is the most influential yaw angle. The mechanism causing drag to change was studied in wind tunnel tests. The factors affecting the change in drag were identified, and measures for reducing that change were examined.
Recommended Content
Technical Paper | Reduction of Energy Used for Vehicle Interior Climate |
Technical Paper | The Review of Present and Future Energy Structure in China |
Technical Paper | AN ANALYTICAL MODEL FOR HYBRID VEHICLES DESIGN |
Authors
Topic
Citation
Kawamata, H., Kuroda, S., Tanaka, S., and Oshima, M., "Improvement of Practical Electric Consumption by Drag Reducing under Cross Wind," SAE Technical Paper 2016-01-1626, 2016, https://doi.org/10.4271/2016-01-1626.Also In
References
- Wieser , D. , Schmidt , H. , Müller , S. , Strangfeld , C. et al. Experimental Comparison of the Aerodynamic Behavior of Fastback and Notchback DrivAer Models SAE Int. J. Passeng. Cars - Mech. Syst. 7 2 682 691 2014 10.4271/2014-01-0613
- Tanaka Kohichiro , Kishiwada Yousuke , Hirano Masaaki , Nakanishi Keiji , Ohta Katsumi , Saitoh Daisuke Trial Results of EV Driving Data Acquisition in the Real World JSAE paper, 20125302
- D'Hooge , A. , Palin , R. , Rebbeck , L. , Gargoloff , J. et al. Alternative Simulation Methods for Assessing Aerodynamic Drag in Realistic Crosswind SAE Int. J. Passeng. Cars - Mech. Syst. 7 2 617 625 2014 10.4271/2014-01-0599
- National Climate Data Center http://www.ncdc.noaa.gov/
- Cooper , K. Pickup Truck Aerodynamics - Keep Your Tailgate Up SAE Technical Paper 2004-01-1146 2004 10.4271/2004-01-1146
- Ogata , N. , Iida , N. , and Fujii , Y. Nissan's Low-Noise Full-Scale Wind Tunnel SAE Technical Paper 870250 1987 10.4271/870250