随着智能网联汽车的快速发展和智能驾驶技术的逐步普及，车载电子控制单元 ECU 模组的数量显著增加，软件功能日益复杂，实现可靠、安全的在线升级 OTA 机制变得尤为重要。文章提出一种基于软件的AB 分区切换（AB Swap）的技术实现方案，该方案可在不增加额外硬件成本的情况下，实现双系统分区备份与切换机制，有效保障 OTA 过程中的系统稳定性和容错能力。该方案基于现有模组的硬件方案实现，为提升现有解决方案的可扩展性和平台适用性提供了一种新的思路。

With the rapid development of intelligent connected vehicles and the gradual popularization of intelligent driving technologies, the number of on-board electronic control unit ECU modules has significantly increased, and the software functions have become increasingly complex. It is particularly important to implement a reliable and secure online upgrade OTA mechanism. This article proposes a technical implementation scheme based on software for AB partition switch (AB Swap), which can achieve a dual-system partition backup and switching mechanism without increasing additional hardware costs, effectively ensuring system stability and fault-tolerant capability during the OTA process. This scheme is implemented based on the existing module's hardware solution and provides a new idea for improving the scalability and platform applicability of the existing solution.