Architectural design and analysis of Electro-Mechanical-Brake system in view of functional safety concept

With the development of automotive intelligence, drive-by-wire system has attracted extensive attention from academia and industry. However, the architectural design of electro-mechanical-brake (EMB) systems has not been emphasized enough, especially in the context of functional safety concept. In view of this, based on ISO 26262, this paper extends the system boundary of functional safety for the first time, and combines EMB system with other systems of the vehicle to build a 4-way redundant EMB system architecture. Furthermore, detailed qualitative and quantitative analysis results are given by using state transition location diagram and quantitative fault tree analysis (FTA) respectively, and the braking failure rate is Q₀ ≈ 2.0003×10^-10 < 10^-8 meets the failure rate requirements of ASIL-D, which prove the security and reliability of the proposed architecture. This paper provides guidance and reference for the design and analysis of EMB system for subsequent researchers, and guarantees the safe development of autonomous vehicles from the safety and reliability of the system.