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Abstract
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27th International Technical Conference on the Enhanced Safety of Vehicles (ESV): Enhanced and Equitable Vehicle Safety for All: Toward the Next 50 Years
https://www-esv.nhtsa.dot.gov/Proceedings/27/27ESV-000009.pdf
International organisation for standardisation (ISO) safety of the intended functionality (SOTIF) is a relatively new standard that explains the verification mechanism for handling the intended functionality of a system as well as reasonable misuse of the system. It is required to practically implement the ISO SOTIF based validation of advanced driver assistance system (ADAS) and autonomous driving. The objective of this paper is to explain the strategy of virtual simulation and synthetic scenario creation for the validation of ISO SOTIF by taking intelligent speed assistance (ISA) as an example. ISO SOTIF suggested process flow is taken as a reference for the derivation of test strategy by keeping technical and functional safety requirements as the foundation for testing. Hazard identification and risk evaluation are implemented by following the defined standard procedure. Virtual simulation tools are utilized for ISO SOTIF synthetic scenario creation. A scenario elicitation approach is proposed with elaborate examples. A tree diagram with all possible and relevant static and dynamic actors is used for generating scenarios. 'One' or 'two-liner' pseudo scenarios are created first, which are then extended to full-fledged scenario details. These detailed scenarios are then implemented in a virtual simulation tool. The algorithm under test is exposed to these ISO SOTIF scenarios in a SIL / MIL / HIL environment, to evaluate how the system responds to such corner cases. It is also possible to generate additional ISO SOTIF scenarios from the input requirement specification. A few scenarios involving varying environmental conditions and hazard simulation instances are showcased in the paper. The paper explains through real-world examples, on how to do ISO SOTIF based testing for autonomous driving systems. A novel and implementation independent ISO SOTIF validation strategy is proposed in this paper. Use cases of residual risks deemed acceptable are also explained in the paper intuitively. ISO SOTIF validation strategy is studied with intuitive examples.
Language: en |