United States Department of Transportation
i
Functional Safety Assessment of a Generic Accelerator Control System with Electronic Throttle Control in Hybrid Electric Vehicles with a Gasoline Internal Combustion Engine
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2019-08-01
[PDF-7.28 MB]
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Abstract:This report describes the research effort to assess the functional safety of accelerator control systems with electronic faults, such as errant electronic throttle control signals, following an industry process standard. This study focuses specifically on errant signals in hybrid electric vehicles (HEVs) that combine an electric powertrain subsystem with a gasoline internal combustion engine. Three common HEV architectures are considered, the series HEV, parallel HEV, and series-parallel HEV. This study follows the concept phase process in the ISO 26262 standard and applies a hazard and operability study, functional failure modes and effects analysis, and systems theoretic process analysis methods. In total, this study derives 8 vehicle-level safety goals and 260 safety requirements (an output of the ISO 26262 and STPA processes). This study uses the results of the analysis to identify potential opportunities to improve the risk assessment approach in the ISO 26262 standard.
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Content Notes:Suggested APA Format Citation: Becker, C., Nasser, A., & Attioui, F. (2019, August). Functional safety assessment of a generic accelerator control system with electronic throttle control in hybrid electric vehicles with a gasoline internal combustion engine. (Report No. DOT HS 812 657). Washington, DC: National Highway Traffic Safety Administration.
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