Future Automotive Systems Technology Simulator (FASTSim) Validation Report - 2021

Chad Baker, Matthew Moniot, Aaron Brooker, Lijuan Wang, Eric Wood, Jeffrey Gonder

Research output: NRELTechnical Report


The National Renewable Energy Laboratory's Future Automotive Systems Technology Simulator (FASTSim) captures the most important factors influencing vehicle power demands and performs large-scale fuel efficiency calculations very quickly. These features make FASTSim well suited to evaluate a representative distribution of real-world fuel efficiency over a large quantity of in-use driving profiles, which have become increasingly available in recent years owing to incorporation of Global Positioning System data collection into various travel surveys and studies. In addition, by being open source, computationally lightweight, freely available, and free from expensive third-party software requirements, analyses conducted using FASTSim may be easily replicated and critiqued in an open forum. This is highly desirable for situations in which technical experts seek to reach consensus over questions about what vehicle development plans or public interest strategies could maximize fuel savings and minimize adverse environmental impacts with an evolving vehicle fleet. While FASTSim continues to be refined and improved on an ongoing basis, this report compiles available runs using versions of the tool from the past few years to provide illustrative comparisons of the model results against measured data.
Original languageAmerican English
Number of pages101
StatePublished - 2021

Bibliographical note

Replaces July 2018 version: NREL/TP-5400-71168

NREL Publication Number

  • NREL/TP-5400-81097


  • FASTSim
  • Future Automotive Systems Technology Simulator
  • modeling
  • powertrain
  • validation
  • vehicle


Dive into the research topics of 'Future Automotive Systems Technology Simulator (FASTSim) Validation Report - 2021'. Together they form a unique fingerprint.

Cite this