Abstract: Engine cold start control in extremely low temperature environments is a critical application scenarios in the field of vehicle control. Due to the extremely low temperature power capability characteristics and cost limitations of the battery, especially for small battery capacity models of hybrid electric vehicles, in order to achieve engine cold start successful in the extremely low temperature, the vehicle generally guarantees the starting function through battery over discharge. However, this approach can easily lead to inaccurate over-discharge control of the battery, thereby resulting in stranding issue. This paper proposes an active battery power capability boundary limitation control architecture and algorithm strategy to address the over-discharge issue during engine start-up in extreme low-temperature conditions. By comparing the over-discharge energy of the battery under vehicle tests between the designed architecture and control strategy and the conventional strategy, it is verified that the architecture and algorithm strategy of the battery power limiting module can effectively control the over-discharge energy boundary of the battery, thereby ensuring the battery anti-stranding function.

Key words: engine cold start; vehicle control system; anti-stranding function; extremely low temperatures

摘要： 极低温环境下发动机冷启动控制是整车控制领域非常重要的应用场景。由于电池极低 温功率能力特性及成本限制，特别是针对混合动力汽车小电池容量车型实现极低温发动机的 成功启动，整车一般会通过电池过放来保证启动功能，但这样也极易造成电池无法精准控制 过放而出现安抛问题。文章针对极低温环境下发机启动的过放问题，提出一种主动式电池功 率能力边界限制的控制架构及算法策略，通过对所设计的架构及控制策略，与旧策略进行整 车测试电池过放能量的对比，证明该电池功率限制模块架构及算法策略能有效实现电池过放 能量边界的有效控制，从而保证电池的防安抛功能。

关键词: 发动机冷启动；整车控制系统；防安抛功能；极低温