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Investigating Possible Fuel Economy Bias Due To Regenerative Braking in Testing HEVs on 2WD and 4WD Chassis Dynamometers
Technical Paper
2005-01-0685
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Procedures are in place for testing emissions and fuel economy for virtually every type of light-duty vehicle with a single-axle chassis dynamometer, which is why nearly all emissions test facilities use single-axle dynamometers. However, hybrid electric vehicles (HEVs) employ regenerative braking. Thus, the braking split between the driven and non-driven axles may interact with the calculation of overall efficiency of the vehicle. This paper investigates the regenerative braking systems of a few production HEVs and provides an analysis of their differences in single-axle (2WD) and double-axle (4WD) dynamometer drive modes. The fuel economy results from 2WD and 4WD operation are shown for varied cycles for the 2000 Honda Insight, 2001 Toyota Prius, and the 2004 Toyota Prius. The paper shows that there is no evidence that a bias in testing an HEV exists because of the difference in operating the same hybrid vehicle in the 2WD and 4WD modes.
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Citation
Duoba, M., Bohn, T., and Lohse-Busch, H., "Investigating Possible Fuel Economy Bias Due To Regenerative Braking in Testing HEVs on 2WD and 4WD Chassis Dynamometers," SAE Technical Paper 2005-01-0685, 2005, https://doi.org/10.4271/2005-01-0685.Also In
References
- SAE J1263 “Road Load Measurement and Dynamometer Simulation Using Coastdown Techniques”
- Smokers, R. MATADOR Report Task 2 T esting methods for vehicles with conventional and alternative drivelines
- Duoba, M. et al. Argonne National Laboratory “Characterization and Comparison of Two Hybrid Electric Vehicles (Hevs)-Honda Insight and Toyota Prius,” SAE 2001-01-1335 . SAE 2001 World Congress March 2001 Detroit, MI
- Nakamura, E. Toyota Motor Corporation “Development of Electronically Controlled Brake System for Hybrid Vehicle,” SAE 2002-01-0300 . SAE 2002 World Congress & Exhibition March 2002 Detroit, MI
- Toyota Motor Corp. “Prius New Car Features 2004,” 2003
- SAE J2264 “Chassis Dynamometer Simulation of Road Load Using Coastdown Techniques,” 1995