关键词: 发动机冷启动；整车控制系统；防安抛功能；极低温

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