| 1. |
- Johansson, R., et al.
(författare)
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A strategy for assessing safe use of sensors in autonomous road vehicles
- 2017
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Ingår i: 36th International Conference on Computer Safety, Reliability, and Security, SAFECOMP 2017. - Cham : Springer. - 9783319662657 ; , s. 149-161
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Konferensbidrag (refereegranskat)abstract
- When arguing safety for an autonomous road vehicle it is considered very hard to show that the sensing capability is sufficient for all possible scenarios that might occur. Already for today’s manually driven road vehicles equipped with advanced driver assistance systems (ADAS), it is far from trivial how to argue that the sensor systems are sufficiently capable of enabling a safe behavior. In this paper, we argue that the transition from ADAS to automated driving systems (ADS) enables new solution patterns for the safety argumentation dependent on the sensor systems. A key factor is that the ADS itself can compensate for a lower sensor capability, by for example lowering the speed or increasing the distances. The proposed design strategy allocates safety requirements on the sensors to determine their own capability. This capability is then to be balanced by the tactical decisions of the ADS equipped road vehicle.
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| 2. |
- Warg, Fredrik, et al.
(författare)
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Defining autonomous functions using iterative hazard analysis and requirements refinement
- 2016
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Ingår i: International Conference on Computer Safety, Reliability, and Security, SAFECOMP 2016 and International Workshop on Assurance Cases for Software-Intensive Systems, ASSURE 2016, Workshop on Dependable Embedded and Cyber-physical Systems and Systems-of-Systems, DECSoS 2016, 5th International Workshop on Next Generation of System Assurance Approaches for Safety-Critical Systems, SASSUR 2016, and 1st International Workshop on the Timing Performance in Safety Engineering, TIPS 2016. - Cham : Springer. - 9783319454795 ; , s. 286-297
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Konferensbidrag (refereegranskat)abstract
- Autonomous vehicles are predicted to have a large impact on the field of transportation and bring substantial benefits, but they present new challenges when it comes to ensuring safety. Today the standard ISO 26262:2011 treats each defined function, or item, as a complete scope for functional safety; the driver is responsible for anything that falls outside the items. With autonomous driving, it becomes necessary to ensure safety at all times when the vehicle is operating by itself. Therefore, we argue that the hazard analysis should have the wider scope of making sure the vehicle’s functions together fulfill its specifications for autonomous operation. The paper proposes a new iterative work process where the item definition is a product of hazard analysis and risk assessment rather than an input. Generic operational situation and hazard trees are used as a tool to widen the scope of the hazard analysis, and a method to classify hazardous events is used to find dimensioning cases among a potentially long list of candidates. The goal is to avoid dangerous failures for autonomous driving due to the specification of the nominal function being too narrow.
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