Abstract: The unitive and effective method to design vehicle automatic driving assistance system applying for functional safety standard ISO26262 is absent nowadays, especially for concept design phase. Therefore, the contents and requirements of the conceptual phase of Part-3 in ISO26262 were expounded in detail, including item definition, initiation of the safety life cycle, HARA analysis and function safety concept. The specific design method of concept phase in accordance with ISO26262 was introduced, and the detailed design steps and analysis process were elaborated according to the case of Lane Keeping Assistance (LKA). The proposed method has been applied to functional safety concept design of some automatic driving assistant systems of Changan automobiles, and provides some methodological guidance for other automatic driving assistant systems to carry out the conceptual design of functional safety.

Key words: vehicle engineering, functional safety, ISO26262, lane keeping assistance, concept design

摘要： 目前功能安全标准ISO26262在汽车自动驾驶辅助系统设计过程中的应用，尤其是概念阶段的设计应用缺乏统一有效的方法。详细阐述了ISO26262标准第三部分概念阶段的内容和要求，包括相关项定义、功能安全周期启动、HARA分析和功能安全概念，介绍了符合ISO26262标准进行概念阶段各部分设计的具体方法，以车道保持辅助（LKA）为例阐述详细的设计步骤和分析过程。此方法已应用于长安汽车部分自动驾驶辅助系统的功能安全概念设计，为其他自动化相关驾驶辅助系统开展功能安全概念设计提供了一定的方法指导。

关键词: 车辆工程, 功能安全, ISO26262, 车道保持辅助, 概念设计