Functional Safety Assessment of a Generic Steer-by-Wire Steering System With Active Steering and Four-Wheel Steering Features

2018Final report; Jul 2015- Mar 2016PDFTech ReportDOT-VNTSC-NHTSA-16-06DOT HS 812 576DTNH22-14-V-0013651HS6CA100Automatic steering controlAdvanced vehicle control systemsSteering systemsFour wheel steeringFailure analysisHazard analysisRisk assessmentSystem safetyUnited StatesUnited States. Department of Transportation. National Highway Traffic Safety AdministrationBecker, ChristopherBrewer, JohnArthur, DavidAttioui, FouadYount, LarryJohn A. Volpe National Transportation Systems Center (U.S.)United States. Department of Transportation. National Highway Traffic Safety AdministrationNTL-INTELLIGENT TRANSPORTATION SYSTEMS-Driver Assistance Systems (Vehicles)NTL-INTELLIGENT TRANSPORTATION SYSTEMS-INTELLIGENT TRANSPORTATION SYSTEMSVolpe National Transportation Systems Center, Technical Reference CenterThis report describes the research assessing the functional safety of foundational steering systems, specifically, steer-by-wire (SbW) systems. This study also considers the additional active steering and four-wheel steering features, which could potentially be incorporated into some SbW systems. This study follows the Concept Phase process in the ISO 26262 standard and applies hazard and operability study, functional failure modes and effects analysis, and systems theoretic process analysis methods. in total, this study identifies five vehicle-level safety goals and 81 SbW system functional safety requirements (an output of the ISO 26262 process). This study uses the results of the analysis to develop potential test scenarios and identify possible areas for diagnostic trouble code coverage