Model-based functional safety analysis method for automotive embedded system application

Abstract

Increasing functionality and complexity of automotive embedded system have led to more risks from systematic faults and random hardware faults. This makes it necessary to perform the functional safety process throughout the safety lifecycle of these systems. In addition, the appearance of the new functional safety standard ISO 26262 also make the consideration of functional safety as part of the design and implementation process for these systems is growing in importance. This paper presents a comprehensive functional safety analysis approach based on functional model. The process of functional modeling and safety analysis is outlined and the comprehensive functional safety analysis approach is applied to Dual Clutch Transmission (DCT) control system and the analysis results are integrated. A method for the automotive safety integrity level (ASIL) determination is put forward based on severity, probability of exposure and controllability.