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Technical Approach to Increasing Fuel Economy Test Precision with Light Duty Vehicles on a Chassis Dynamometer
Technical Paper
2016-01-0907
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
In 2012, NHTSA and EPA extended Corporate Average Fuel Economy (CAFE) standards for light duty vehicles through the 2025 model year. The new standards require passenger cars to achieve an average of five percent annual improvement in fuel economy and light trucks to achieve three percent annual improvement. This regulatory requirement to improve fuel economy is driving research and development into fuel-saving technologies.
A large portion of the current research is focused on incremental improvements in fuel economy through technologies such as new lubricant formulations. While these technologies typically yield less than two percent improvement, the gains are extremely significant and will play an increasing role in the overall effort to improve fuel economy.
The ability to measure small, but statistically significant, changes in vehicle fuel economy is vital to the development of new technologies. There are two approaches used to increase the resolution of a fuel economy measurement. The first approach is to conduct a large number of tests and to rely on Bernoulli’s Law of Large Numbers [1] to determine if a change is statistically significant. The other approach is to minimize the test variability by increasing test precision.
This paper will discuss the development of a Direct Electronic Vehicle Control (DEVCon) system that can operate a vehicle with high precision while testing for emissions and fuel economy on a chassis dynamometer.
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Citation
Blanks, M. and Forster, N., "Technical Approach to Increasing Fuel Economy Test Precision with Light Duty Vehicles on a Chassis Dynamometer," SAE Technical Paper 2016-01-0907, 2016, https://doi.org/10.4271/2016-01-0907.Also In
References
- Bernoulli , J. Wahrscheinlichkeitsrechnung Ostwalds Klassiker der exakten Wissenschaften W. Engelmann Leipzig 1899
- Gryce , R. Ford Auto/Emission Driver System SAE Technical Paper 741007 1974 10.4271/741007
- Muller , K. Computer Control of a Robotic Driver for Emission Tests IEEE 0-7803-0582-5 1992
- Thiel , W. , Gröf , S. , Hohenberg , G. , and Lenzen , B. Investigations on Robot Drivers for Vehicle Exhaust Emission Measurements in Comparison to the Driving Strategies of Human Drivers SAE Technical Paper 982642 1998 10.4271/982642
- McKay , D. , Nichols , G. , and Schreurs , B. Delphi Electronic Throttle Control Systems for Model Year 2000;Driver Features, System Security, and OEM Benefits. ETC for the Mass Market SAE Technical Paper 2000-01-0556 2000 10.4271/2000-01-0556
- 49 CFR Part 531
- 40 CFR (Part 86.115-78 and Appendix 1)
- UNECE Regulation No. 101, Rev. 3
- SAE International Surface Vehicle Recommended Practice Drive Quality Evaluation for Chassis Dynamometer Testing SAE Standard J2951 Nov. 2011