United States Department of Transportation
i
A Test Track Comparison of the Global Vehicle Target (GVT) and NHTSA’s Strikeable Surrogate Vehicle (SSV)
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2019-07-01
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[PDF-2.23 MB]
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Edition:Final Report
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Abstract:The primary objective of the work described in this report was to compare the forward collision warning (FCW) alert and crash imminent braking (CIB) intervention onset timing elicited by the Global Vehicle Target Revision E (GVT) to that observed during identical tests performed with NHTSA’s Strikeable Surrogate Vehicle (SSV) benchmark. Three light vehicles and three rear-end crash scenarios were used for this evaluation. A secondary objective of this study was to describe some of the test track based use considerations related to the GVT, namely the dynamic stability and in-the-field reconstruction time after being struck by a test vehicle. GVT stability was assessed using straight line and curved path maneuvers at various speeds and lateral accelerations. Reconstruction times were examined using different impact speeds, directions of impact, and assembly crew sizes. Multiple approaches were used to evaluate the data from this research. These analyses suggest that the Mercedes C300 and Volvo S90 responded similarly to both the GVT and SSV, with the Volvo S90 responses being the most consistent of these vehicles. The Tesla Model S test results suggest that there may have been minor differences in how it responded to the two targets, however a firmware update that occurred during testing made it unclear whether these potential differences were due to perceived dissimilarities in the targets or operational differences of the vehicle’s firmware. This uncertainty meant the Tesla Model S data could not be incorporated into the final assessment of the two test targets. Going forward, this serves to highlight the importance of software control in testing a vehicle over extended periods. The GVT was physically stable and remained affixed to the robotic platform used to facilitate its movement during the high-speed longitudinal tests as well as those performed at the limit of the platform’s lateral road holding capacity. Reassembly tests demonstrated that five people could reassemble the GVT significantly faster than three people (6.1 to 7.7 minutes versus 7.9 to 10.1 minutes). However, if the robotic platform needed to be re-initialized after the GVT is dislodged from it, the actual time between test trials was closer to 20 minutes regardless of reassembly team size.
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Content Notes:Suggested APA format citation: Snyder, A.C., Forkenbrock, G.J., Davis, I.J., O’Harra, B.C., & Schnelle, S.C. (2019, July). A test track comparison of the global vehicle target and NHTSA's strikeable surrogate vehicle. (Report No. DOT HS 812 698). Washington, DC: National Highway Traffic Safety Administration.
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