质子交换膜(PEM)燃料电池是一种清洁高效的新型能源。PEM 燃料电池的湿度对燃料电池的工作性能和使用寿命有着重要的影响。当输出负载变化时，如何采取适当的控制策略控制加湿器出口气体的湿度是燃料电池技术中的一个难题。加湿器出口气体的湿度主要受加湿器温度的影响。然而加湿器的温度系统是一个大时滞非线性系统，采用常规的PID 控制无法实现有效的控制。本文基于专家PID 控制策略来控制加湿器的温度。仿真和实验结果表明，该算法可以得到良好的控制效果。关键词：质子交换膜燃料电池；加湿器；温度控制；专家PID 控制Abstract: Proton Exchange Membrane (PEM) Fuel Cell is a clear and efficient new energy source. The humidity of PEM fuel cell plays an important role in the performance of the fuel cell. One of the problems of fuel cell technology is how to control the humidity of the outlet gases of the humidifier. Experiments show that the temperature of humidifier decides the outlet humidity. Since the temperature system of humidifier is a large time-delay nonlinear system, the normal PID control can not achieve the desired performance. This paper presents an Expert PID control strategy to control the temperature of the humidifier. Simulation and experiments show that the proposed method can achieve satisfactory performance.Key words: proton exchange membrane fuel cell, humidifier, temperature control, expert PID control