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Computation of Safety Architecture for Electric Power Steering System and Compliance with ISO 26262
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on April 14, 2020 by SAE International in United States
Nowadays and with the advancement of the automotive industry, functional safety has become one of the most significant challenges for autonomous and connected vehicles. The automotive industry is transforming from conventional driving technology where the driver or the human being is a part of the control loop to fully autonomous development and self-driving mode. The SAE levels of autonomy define level 4 by (These automated driving features will not require you to take over driving). Thus, more and more safety-related electronically controlled units ECUs are deployed in the control module of the vehicle. As a result, more complexity of system architecture, software, and hardware are interacting and interfacing which increases the risk of both systematic and random hardware failures. In order to reduce these risks and avoid any potential failure or loss of control, ISO 26262 was introduced and developed to guide the automotive original equipment manufacturer OEMs and suppliers to ensure an adequate and acceptable level of safety procedures are implemented. This study focuses on the EPS systems and their ASIL assignement. It was found that new challenges emerged recently for the EPS systems such as higher foces at the steering racks and more ADAS functionalities, Consequesntly, The ASIL computation has shifted for EPS system becasue any sudden LOA will lead to catastrophic accidents. The definitions of exposure and controllability is ISO 26262 are not fully mature and need some modification in the light of the above given facts of the fuctional safety of steering systems.