小功率燃料电池液晶显示系统设计

本文针对小功率燃料电池系统的温度、压力、气流量等被控量,设计了一种小型监测显示系统.根据监控显示系统所要达到的性能指标,研究了液晶显示系统的硬件总体结构.以PIC18F258单片机为核心,完成了电源模块、液晶显示接口模块、按键模块、RS485通信接口模块的设计并制作了PCB板.在软件设计上,基于PIC软件开发平台,采用模块化结构,运用C语言与汇编语言混合编程的方式,完成了液晶显示系统的软件编程并调试通过.实践证明该系统具有良好的显示界面,同时也增强了该硬件平台的抗干扰能力,提高了液晶显示系统的可操作性.     

设计模式在燃料电池测试系统中的应用

针对传统的面向过程的软件设计方法已无法应对市场对燃料电池测试系统快速的需求变化,提出将设计模式应用于燃料电池测试系统软件的开发过程,重点介绍了抽象工厂模式、命令模式、观察者模式、外观模式的应用。实验结果表明,基于面向对象设计模式开发的燃料电池测试系统软件具有良好的架构,实现了程序模块间的低耦合和模块内部的高内聚,提高了程序的可维护性和可复用性,能够灵活应对功能需求的变化。采用该架构开发完成的多款燃料电池测试软件运行稳定可靠。     

燃油加油机检定中温度的测量与控制

本文中主要介绍了燃油加油机的工作原理,以及需要关注的温度和对温度的测量和控制的相关措施.希望可以引起人们的关注同时也帮助人们掌握一些燃油加油机的相关知识.     

Planar micro-direct methanol fuel cell prototyped by rapid powder blasting

We present a planar micro-direct methanol fuel cell (μ-DMFC) fabricated by rapid prototyping-powder blasting technology. Using an elastomeric mask, we pattern two parallel microfluidic channels in glass. The anode and cathode of the fuel cell are formed by wet spraying Pt-Ru/C and Pt/C catalysts, respectively, onto Au electrodes that are evaporated in the microchannels. Simply clamping a Nafion 117 proton exchange membrane (PEM) using a glass substrate covered with PDMS membrane onto the microchannels completes the fuel cell fabrication. Our μ-DMFC generates a voltage of 0.45 V and can deliver a power up to 0.5 mW/cm² by using 1 M CH₃OH in 0.5 M H₂SO₄ solution as fuel in the anodic channel, and 0.01 M H₂O₂ in 0.5 M H₂SO₄ as oxidant solution in the cathodic channel.     

直接甲醇燃料电池双极板的研究进展

作为直接甲醇燃料电池的关键部件之一,双极板主要起分配燃料和收集电流的作用,其直接影响燃料电池的性能和成本。介绍了目前国内外双极板的研究现状及进展。     

MEMS微型燃料电池及其基于压电风扇的换气方法

介绍了基于MEMS的微型燃料电池的国内外研究动态 ,对其技术关键进行了阐述。在此基础上 ,对微型燃料电池的换气方法进行了研究。提出一种低功耗、体积小的压电风扇 ,对其力学模型进行了分析 ,并进行了风速、振幅、功耗等方面的实验研究 ,初步证明其应用于微型燃料电池换气的可行性     

Current control in high-efficiency unidirectional converter for fuel cell

This paper presents a model to implement the switching technique of a novel isolated DC/DC converter of full-bridge to link fuel cell power output to the distribution system. The implementation was performed on a DSP F2812 of Texas Instruments. It is also proposed a new start-up system (software), to avoid overcurrent on the input side of inverter. This software avoids using an auxiliary circuit for start-up, so reducing costs, improving volume and weight and maintaining the same efficiency. A prototype has been implemented to validate the performance. Finally, comparative experimental results are presented.     

Numerical investigation of liquid cooling cold plate for power control unit in fuel cell vehicle

This paper proposed fifteen structure schemes of the liquid-cooled plate for thermal control of the power control unit (PCU) in fuel cell vehicle (FCV). At the given serpentine channel with inconstant width, pin fin arrays with various configurations were arranged to improve the performance of three heating zones with multiple heat sources. Based on the same setup and boundary conditions, numerical simulations were conducted for different schemes. The solutions were validated by grid independence check and comparison with previous researches. Effects of fin geometrical parameters (such as diameter, height, fin pitch and shape) on pressure drop and heat transfer characteristics were investigated. Furthermore, two dimensionless factors η_H and η_P were quantified to evaluate the heat transfer enhancement and pressure drop augmentation. The dimensionless performance evaluation factor P_EF was cited to assess overall performance of the cold plate. Based on three factors mentioned above, cooling performances of three heating zones and the whole plate were compared among all schemes. According to the performance comparison, scheme 12 employing circular fins with diameter of 4 mm was selected as the optimal solution for the cold plate.     

固体氧化物燃料电池的建模与仿真

能源短缺和环境问题已成为本世纪全球面临的最重要课题,作为一种新的能源形式,固体氧化物燃料电池(SOFC)技术日益受到重视。由于现有的SOFC模型过于复杂,难以满足工程上对SOFC系统实时控制的需求,提出利用粒子群算法(PSO)优化径向基函数(RBF)神经网络,从而实现对SOFC的建模。PSO对RBF神经网络的中心值和连接权值进行优化,提高了网络的泛化性能,使其非线性逼近能力更强,从而达到精确模型的目的。仿真实验验证了粒子群算法在SOFC建模的有效性。     

一种基于布谷鸟算法的质子交换膜燃料电池湿度辨识方法

为了提高燃料电池内部交换膜湿度的测量精度,本文基于区间二型模糊逻辑计算理论,结合Cuckoo Search 算法,建立了一种辨识方法,对其湿度特性进行非线性拟合逼近。通过对非线性拟合结果进行验证,所设计的辨识方法在对燃料电池进行湿度拟合的过程较为精确。计算模型的输出结果较为稳定,测试稳定性较高,此类测量技术能够广泛应用于各类离线测量系统中。     

采用温控和碘吸收池技术的发射激光稳频技术

多普勒测风激光雷达通过分析系统回波信号的多普勒频移反演出风速,为提高风场探测精度,从稳频技术方面展开研究。在稳频过程中,分别采取措施消除激光频率的长期漂移和短期抖动。针对激光频率的长期漂移,设计并研制了种子激光器温控箱,通过水浴的控温方式大大减小了激光频率的长期漂移,将激光频率稳定在±50 MHz以内;针对激光频率的短期抖动,采用以碘分子吸收池为核心器件的稳频系统,通过半导体控温方式对碘分子吸收池精确控温,控温精度达0.03 ℃,提高了稳频精度,将激光频率进一步稳定在±8 MHz以内,满足±10 MHz以内的设计精度要求。通过搭建多普勒测风激光雷达系统,对发射激光稳频装置进行系统验证,连续4组风场观测结果表明:系统探测高度为17 km,绝大部分方差在4 m/s以下,满足测风激光雷达测量指标的要求。