This content is not included in your SAE MOBILUS subscription, or you are not logged in.
System Simulation and Analysis of EPA 5-Cycle Fuel Economy for Powersplit Hybrid Electric Vehicles
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 08, 2013 by SAE International in United States
Annotation ability available
To better reflect real world driving conditions, the EPA 5-Cycle Fuel Economy method encompasses high vehicle speeds, aggressive vehicle accelerations, climate control system use and cold temperature conditions in addition to the previously used standard City and Highway drive cycles in the estimation of vehicle fuel economy.
A standard Powersplit Hybrid Electric Vehicle (HEV) system simulation environment has long been established and widely used within Ford to project fuel economy for the standard EPA City and Highway cycles. Direct modeling and simulation of the complete 5-Cycle fuel economy test set for HEV's presents significant new challenges especially with respect to modeling vehicle thermal management system and interactions with HEV features and system controls. It also requires a structured, systematic approach to validate the key elements of the system models and complete vehicle system simulations.
This paper describes a methodology developed at Ford for system simulation and analysis of EPA 5-Cycle fuel economy for powersplit HEV's. Important newly developed elements of the vehicle system models are explained including the modeling of vehicle and engine controls and the procedures of running simulations in accordance with 5-Cycle fuel economy test procedures. Examples of using the system simulation for control calibration optimization to balance 5-Cycle FE and other vehicle attributes are presented. Finally, the paper describes a process for verifying and maintaining the accuracy of the HEV system models over the course of a production vehicle program.
CitationMeng, Y., Jennings, M., Schwartz, W., and Tsou, P., "System Simulation and Analysis of EPA 5-Cycle Fuel Economy for Powersplit Hybrid Electric Vehicles," SAE Technical Paper 2013-01-1456, 2013, https://doi.org/10.4271/2013-01-1456.
- CFR Title 40, Part 600 Fuel Economy and Carbon Related Exhaust Emissions of Motor Vehicles http://www.gpoaccess.gov/cfr/index.html
- Belton , C. , Bennett , P. , Burchill , P. , Copp , D. et al. A Vehicle Model Architecture for Vehicle System Control Design SAE Technical Paper 2003-01-0092 2003 10.4271/2003-01-0092
- Jennings , M. , Brigham , D. , Meng , Y. and Bell , D. 2004 A Comparative Analysis Methodology for Hybrid Electric Vehicle Concept Assessment SAE Paper 2004-01-0574
- Meng , Y. , Jennings , M. , Tsou , P. , Brigham , D. et al. Test Correlation Framework for Hybrid Electric Vehicle System Model SAE Int. J. Engines 4 1 1046 1057 2011 10.4271/2011-01-0881
- Fuel Economy Labeling of Motor Vehicles: Revisions to Improve Calculation of Fuel Economy Estimates US EPA Office of Transportation and Air Quality Report Number EPA420-R-06-017 December 2006
- SAE International Surface Vehicle Recommended Practice Road Load Measurement Using Onboard Anemometry and Coastdown Techniques SAE Standard J2263 Dec. 2008
- Zaremba , A. , Lechowicz , P. , and Jennings , M. Engine Control Unit Modeling with Engine Feature C Code for HEV Applications SAE Technical Paper 2013-01-1451 2013