车载燃料电池发动机交流阻抗测量系统设计及应用

Design and application of AC impedance measurement system for vehicle fuel cell engine

为解决车载质子交换膜燃料电池发动机在-30℃低温冷储存及冷启动问题,提出了一种测量车载燃料电池发动机单片交流阻抗的测量系统,单片电流电压信号通过带通滤波电路处理后,进行快速傅里叶变换计算出单片阻抗;在采集阻抗时,通过另外一个控制核心采集单片电压,实现了单片电压及阻抗的同步双采集。在系统关机策略中,将单片阻抗作为关机判据,在其达到低温储存及冷启动的阈值点后,系统停止吹扫完成关机。系统能够在-30℃低温储存及冷启动,并最终在北京2022冬奥会实车批量应用。

In order to solve the problem of low-temperature cold storage and cold start of vehicle-mounted proton exchange membrane fuel cell engine at-30°C,this paper proposes a measurement system for measuring the monolithic AC impedance of onboard fuel cell engine.The monolithic current and voltage signals are processed by a band-pass filter circuit,and the monolithic impedance is calculated by a fast Fourier transform.When collecting impedance,the monolithic voltage is collected through another control core,realizing simultaneous dual collection of monolithic voltage and impedance.In the system shutdown strategy,the monolithic impedance is used as the shutdown criterion,and after it reaches the threshold point of low temperature storage and cold start,the system stops purging and completes shutdown.The system can be stored at-30°C and cold started,and finally used in batch applications at the Beijing 2022 Olympic Winter Games.