中图分类号：TP29 文献标志码：A DOI: 10.16157/j.issn.0258-7998.233706
中文引用格式： 王海平，赵兴旺，李飞强. 车载燃料电池发动机交流阻抗测量系统设计及应用[J]. 电子技术应用，2023，49(8)：70-75.
英文引用格式： Wang Haiping，Zhao Xingwang，Li Feiqiang. Design and application of AC impedance measurement system for vehicle fuel cell engine[J]. Application of Electronic Technique，2023，49(8)：70-75.

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

Abstract： 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 on-board 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.

Key words : fuel cell engine；AC impedance；cold start；bandpass filter；fast Fourier transform