The development of integrated brake system for hybrid and electric vehicles poses new challenges and opportunities for functional safety analysis, design and validation. Integrated brake system is advanced brake-by-wire system that integrates booster brake function, extern brake function, anti-lock brake function, electronic stability function, and other related brake functions into one compact unit. Integrated brake system is complex and has more interaction relationships among different modules than conventional brake systems. Therefore, ensuring the safety of integrated brake system is essential and requires systematic approach. This paper presents a systematic approach for functional safety analysis, design and validation of intelligent brake system. The purposed approach consists of an integrated system safety framework, which includes the following steps: system design, hazard analysis, and risk assessment, safety requirements specification, safety design and system test. The approach is applied to intelligent brake system, safety design and tests are performed. The system test includes fault injection experiments under critical driving scenario to validate the designed safety mechanism. This paper verifies that the proposed safety framework can effectively guarantee the functional safety of integrated brake system and enhance the braking performance.
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