基于单片机的区域交通信号控制系统

介绍了一种基于单片机的区域交通信号控制系统设计方案,阐述了系统的工作原理及各主要模块的软硬件实现方法。系统能够根据车流量信号动态地改变交通信号灯各状态配时,并通过无线通信技术,有效地解决了特定区域内各路口信号机之间数据的传输,实现了区域交通信号的智能控制。该系统抗干扰能力强,可靠性高,使用非常方便。     

基于SOPC的软硬件协同设计

对SOPC的发展现状和相关技术进行了研究,简要论述了SOPC的优点,介绍了软硬件协同设计可以根据系统各功能模块的特点和设计约束来选择合适的软件或硬件实现方式的设计原理。以Altera公司的SOPC实现平台为背景,结合实际工程应用,介绍了基于SOPC的软硬件协同设计的设计流程,从而探讨出一种便捷实用的软硬件协同设计方法。     

Experimental design of a fuzzy controller for improving power factor of boost rectifier

This article presents the design and the implementation of dSPACE DS1104 controller board-based PI and fuzzy logic peak current-mode controllers in the voltage loop and two controllers in the current loop based first on a standard fixed hysteresis band control, followed by a variable hysteresis band control to achieve constant switching frequency for a single-phase active power factor corrector in the continuous conduction mode. All these controllers have been verified via simulation in Simulink and a real-time implementation is performed on an experimental test bench utilising a rapid prototyping tool. The controllers are experimentally compared for steady-state performance and transient response. It is shown that the PI and fuzzy logic controllers give a superior steady-state performance, whereas the fuzzy logic inference based controller can achieve better dynamic response than its PI counterpart under large load disturbance and plant uncertainties. Furthermore, the variable hysteresis band control in the current loop gives a low total harmonic distortion of the input current compared to a standard fixed hysteresis band control.     

Hardware solutions for fuzzy control

A large fraction of software designs using microcontrollers is today adopting fuzzy logic algorithms and this fraction is likely to increase in the future. Hardware implementation of fuzzy logic ranges from standard microprocessors to dedicated ASICs and each different approach is targeted to a different application domain or market area. In this paper, we present an overview of the computational complexity of the fuzzy inference process and the various techniques adopted for fuzzy control tasks, highlighting the tradeoffs that can guide a system designer toward correct choices according to application features and cost/performance issues. In addition, we detail three case studies of architectures that address three different market segments in the fuzzy hardware scenario: dedicated fuzzy coprocessors, RISC processors with specialized fuzzy support and application specific fuzzy ASICs     

Fuzzy control of dc–dc converters based on user friendly design

The aim of this paper is to show how to build a fuzzy controller and its membership functions automatically. In a fuzzy logic controller (FLC), the proposed method allows one easily to construct a set of membership functions, called shrinking-span membership functions (SSMFs). The FLC uses Mamdani-type fuzzy controllers for the defuzzification strategy and inference operators. The FLC hardware implementation is performed on an 8-bit microcontroller. Simulation results and experimental results demonstrate that the converter can be regulated with good performance even when subjected to input disturbance and load variation. The presented approach is generally valid for the design of an FLC, and can be applied to any dc–dc converter topologies.     

高可靠性通信设备的主备倒换设计

主控板的主备倒换是通信设备稳定运行的关键技术。提出了一种基于硬件实现主备倒换的设计方案,并对其主要模块和关键实现技术进行了深入的研究。本设计具有较强的通用性和自适应性,能够提供主控板主备状态的切换以及主备板的MAC地址的处理。     

面向自动控制实验的多功能实验平台设计

针对自动控制专业实验内容多样,实验环境复杂的特点,设计了一种基于DSP的多功能实验平台,通过在DSP中加载特定的实验应用程序,动态配置外围控制电路,实现多类型的自动控制实验。详细阐述了多功能实验平台的组成结构、DSP控制程序开发主要模块的设计与实现方法。实验平台为用户提供了良好的二次开发接口,有助于用户在该平台的硬件环境基础上,开发功能更加完善和复杂的自动控制实验内容。     

Microprocessor Implementation of PID Controllers and Lead-Lag Compensators

This paper discusses the microprocessor implementation of two widely used industrial controllers: the PID controller and the Lead-Lag compensator. The main characteristics of this implementation are the general form of the equations used, the high precision maintained, and the capability of handling a wide range of numbers by means of floating point representation in the microprocessor. An 8-bit general purpose microprocessor is employed, and the entire hardware and software required for the floating point arithmetic simulation and the controller's realization are presented. The flexibility of the proposed design is also discussed. The material presented in this paper may be useful to control engineers interested in microprocessor-based control, as well as to microprocessor/computer specialists interested in applications to the control field.     

VW550多路图像集成显示系统设计与实现

提出了一种VW550多路图像集成显示系统的硬件、软件设计方案,以及在基于DLP或者LCD的拼接大屏幕显示系统中的应用方法。本应用系统基于Altera公司的SoPC技术,采用大规模FPGA作为多路图像集成显示处理系统的控制核心。该处理系统由主控板卡、视频矩阵板卡、VGA矩阵板卡组成,详细介绍了多块板卡的组成结构与工作原理,并针对基于硬件描述语言设计实现的PCI适配协议进行了分析。系统硬件设计简洁、软件可扩展性好,实验部分给出了完整的硬件平台和拼接屏幕控制效果。     

基于Matlab平台的模糊控制器的设计与仿真

模糊控制是一种基于语言规则与模糊推理的高级控制．是现代智能控制的重要分支，已受到国内外工程技术人员的普遍重视。首先简要介绍了模糊控制的产生、特点及意义；随后介绍了双输入单输出模糊控制系统的具体设计，并用Matlab模糊系统工具葙进行测试；最后，对使用模糊控制器与PID控制器的控制效果进行了比较。     

基于多模组3G视频传输终端的硬件设计与仿真

针对3G模块无线视频监控通信中出现的缺陷,通过USB硬件扩展方式实现了一种基于S3C2440为核心的多模组3G无线视频传输终端硬件平台系统.构建了硬件电路的总体架构,并阐述了关键功能的实现方法,最后使用Candence仿真软件对设计进行了仿真.在设计仿真中同时给出了硬件设计中的SI问题的控制措施.实验表明,该硬件平台能...     

基于DM642的嵌入式视频监控系统硬件设计

以视频编解码硬件系统及其实现技术为研究内容，以TMS320DM642为核心，结合TVPS150＆SAA7105视频编解码心芯片，设计了高性能的视频监控系统。详细说明了系统架构以及各功能模块，给出了各模块的硬件连接图，并结合实际设计中碰到的问题给出解决方法。最后在此基础上简要介绍了系统的应用前景以及功能扩展。     

基于Labwindows/CVI飞机启动系统自动测试平台的设计与实现

本文叙述了飞机启动系统自动测试平台的开发实现,该系统使用以数据采集卡（PC—DAQ）为核心的虚拟仪器技术。硬件部分主要包括PIO_821PGL多功能数据采集卡和工业控制计算机,软件部分则以Labwindows/CVI为开发平台,并在设计中充分考虑使用时在可靠性、精度、方便性以及可扩展性等方面的要求。最后,对测试平台的软硬件进行了测试,结果表明：该系统可靠性高、性能稳定、测试精度和速度均满足飞机启动系统QDX-11的要求。     

Multilayered fuzzy behavior fusion for real-time reactive controlof systems with multiple sensors

Fuzzy linguistic rules provide an intuitive and powerful means for defining control behavior. Most applications that use fuzzy control feature a single layer of fuzzy inference, mapping a function from one or two inputs to equally few outputs. Highly complex systems, with large numbers of inputs, may also benefit from the use of qualitative linguistic rules if the control task is properly partitioned. This paper presents a modular fuzzy control architecture and inference engine that can be used to control complex systems. The control function is broken down into multiple local agents, each of which samples a subset of a large sensor input space. Additional fuzzy agents are employed to fuse the recommendations of the local agents. Real-time implementation without special hardware is possible by using singleton output values during fuzzy rule evaluation. A development tool is used to translate a fuzzy programming language offline for fast execution at run time. Using this system, a multilayered fuzzy behavior fusion based reactive control system has been implemented on an autonomous mobile robot, MARGE, with great success. MARGE won first place in Event III of the 1993 Robot Competition sponsored by the American Association for Artificial Intelligence     

基于NiosII的JPEG图像压缩系统平台设计

文中提出了一种基于NIOSII软核处理器的JPEG图像压缩系统平台的实现方法,主要介绍了SOPC技术以及NIOSII软核处理器的特点,并分别介绍了系统的硬件结构设计以及工作原理和JPEG图像压缩算法流程以及软件实现方法。采用该系统平台能够更加方便快捷的实现JPEG压缩算法的应用,而且可以根据图像压缩处理的要求,对系统进行灵活地裁减、扩充,真正实现了系统软硬件的可编程。     

Sequential design of hysteresis current controller for three-phaseinverter

In this paper, a novel multivariable hysteresis current controller for three-phase inverters is presented. Hysteresis controllers are intrinsically robust to system parameters, exhibit very high dynamics, and are suitable for simple implementation. The main drawback of the hysteresis controller is a limited control on transistors' switching frequency. Very high switching frequency may result if three independent controllers are used. Multivariable solutions were proposed in the literature to solve the problem. In this paper, it is shown how the use of a sequential design for the multivariable controller can further contribute to transistors' switching frequency reduction, with no significant increase in the hardware implementation complexity. The proposed controller is illustrated and compared with other hysteresis controllers presented in the literature. It ensures a significant reduction of transistors' switching frequency with respect to the other tested controllers, under the same operating conditions. A prototype controller is also presented. The effects of noise captured by current sensors (especially Hall-effect type) on the performance of industrial hysteresis controllers are discussed. It is shown how the sequential design of the controller can also help in solving this critical problem. Experimental results are reported to confirm the quality of the proposed controller. The system stability condition is derived in an appendix     

Identification, digital control and fuzzy logic techniques applied to a synchronous generator

The experimental results obtained in the design and implementation of an decoupled digital speed and voltage controller for a micro-energy system are reported in this work. The studied system is formed by a 9 Kw DC motor driving a 10 KVA synchronous machine. There are two control loops in the proposed controller: the speed control (speed governor) and the control of the stator's voltage (automatic voltage regulator). Each control loop was designed using linear control techniques and fuzzy control techniques. Tests on the system show the performance of the proposed controllers.     

家用电器模糊控制器的研究与设计

采用模糊控制器对家用电器进行自动控制，给出了家用电器模糊控制器的设计过程和硬件设计方案。将人工智能领域的模糊控制技术成功地应用到了家用电器的设计中，使其实现一定的智能化，扩展了其功能，给人们的生产和生活带来了更多的方便。