This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Addressing Variation in Full Vehicle Automatic Transmission Fluid Fuel Economy Testing
Technical Paper
2016-01-2207
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
With government mandates, original equipment manufacturers are increasingly focusing on fuel economy and finding efficiency gains throughout the vehicle. Lubricant companies have been asked to design fluids that aid in this effort. Demonstrating real gains becomes complex given the intricacies of these systems and methods range from bench top screen tests to component test stands to full vehicle testing. This paper addresses the variation that was encountered when testing automatic transmission fluid efficiency within a full vehicle test. While it is well known that variability in testing conditions such as engine load or vehicle speed will lead to variability in results, the magnitude of their impact on average throughout the test cycle suggests that repeat testing may not be sufficient to guard against improper conclusions. In fact, our data indicates that typical differences in average conditions across the cycle can be associated with predictable impacts in test results of 0.7%-1% for vehicle fuel economy (in miles per gallon) when tested on the Highway Fuel Economy Test (HFET). In this paper we discuss an empirical model that quantifies the impact average operating conditions observed during the HFET test cycle can have on the miles per gallon reported for that cycle. This model explains differences between laboratories as well as replications over time at the same laboratory. In many cases normalizing test results to adjust for the average operating conditions could be an economical way to improve the ability to discriminate among fluids.
Recommended Content
Authors
Citation
Schiferl, E., Hunt, T., and Slocum, R., "Addressing Variation in Full Vehicle Automatic Transmission Fluid Fuel Economy Testing," SAE Technical Paper 2016-01-2207, 2016, https://doi.org/10.4271/2016-01-2207.Also In
References
- Fuel Economy Home Page Fuel Economy April 19 2016 http://www.fueleconomy.gov/
- 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 10.4271/2016-01-0907
- Paulsell , C. and Kruse , R. Test Variability of Emission and Fuel Economy Measurements Using The 1975 Federal Test Procedure SAE Technical Paper 741035 1974 10.4271/741035
- Simpson , B. Improving the Measurement of Chassis Dynamometer Fuel Economy SAE Technical Paper 750002 1975 10.4271/750002
- Moskalik , A. , Dekraker , P. , Kargul , J. , and Barba , D. Vehicle Component Benchmarking Using a Chassis Dynamometer SAE Int. J. Mater. Manf. 8 3 869 879 2015 10.4271/2015-01-0589
- Middleton , R. , Harihara Gupta , O. , Chang , H. , Lavoie , G. et al. Fuel Efficiency Estimates for Future Light Duty Vehicles, Part B: Powertrain Technology and Drive Cycle Fuel Economy SAE Technical Paper 2016-01-0905 2016 10.4271/2016-01-0905
- OBD-II Resource Percent Load Calculations June 2016 http://obdcon.sourceforge.net/2010/06/about-pid-calculated-load-value/
- Neter , J. , Wasserman , W. and Kutner , M. Applied Linear Statistical Models Second Homewood Richard D. Irwin 1985 0-256-02447-2