燃料电池空气进气流量建模与仿真分析

质子交换膜燃料电池负载电流变化时,其进气流量不当会导致发生氧饥饿,降低电池的输出效率。为此,搭建了空气供给系统模型,采用传统PI控制、模糊控制和模糊PI控制策略分别对空气进气流量进行控制,将阴极实际进气流量与理想进气流量的差值作为控制器输入,通过控制空压机的电压来控制空压机转速,进而控制空气进气流量,实现闭环控制。以过氧比随阶跃电流的变化曲线作为观测对象,对3种控制策略进行仿真分析。仿真结果表明:3种控制策略均可将原来的控制时间由1.5 s缩短为0.5 s,其中,模糊控制的超调量最小;模糊PI控制后空压机消耗能量降低最为明显,比前馈调节降低了1.02%。

温差式热膜空气质量流量传感器

论述了热膜式空气质量流量计的基本工作原理 ,通过对传感器单元的传热分析设计了一种温差式热膜空气质量流量传感器 ,试验结果表明 。

Feasibility Research on the High Speed Rotary Positive Air Filter

The structure, separation principle and feasibility research for a new type of vehicle air filter called the high speed rotary positive air filter were described. The analysis of the experimental data showed that the principle and structure of it were feasible and it possessed high separation efficiency and great self cleaning ability. Compared with the conventional air filter it also has lower air intake loss. So it is worth further practical research.