Standards Development

Scope

This document describes necessary but not sufficient safety requirements for the use of SbW systems in passenger cars and light commercial vehicles for series application.

This document does not replace the full application of the ISO 26262 series of standards and their implementation in safety-related measures.

This document defines requirements for manual driving where the driver holds the steering wheel.

NOTE Misuse of hands-free driving is not considered. The document does not contain requirements for the use of automated lateral vehicle control functions. The requirements consider systems consisting of a road wheel actuator, hand wheel actuator and a steering wheel for driver input. Deviating concepts need to be analyzed by the user for transferability.

Purpose

SbW systems represent the next generation of technology in vehicle steering. They enable new interior concepts and pave the way for further innovations in vehicle technology. In the context of automated driving, mechanical decoupling between the steering wheel and the steered wheels is becoming increasingly important. To date, there is no experience of widespread use of this technology in the market for large-series passenger cars. Compared to conventional steering systems, SbW technologies results in additional requirements for a safety concept in a vehicle for safe operation. The new project provides a description of a minimal set of safety aspects developed by the vehicles manufacturers and system suppliers. The document considers the description and system boundary of a SbW system, basic safety goals, general availability requirements, requirements for controllability in the event of first faults and requirements for the operational behaviour after a fault event.