【作者】 王国宁；

【导师】 唐明浩；

【作者基本信息】 东华大学 ， 控制理论与控制工程， 2006， 硕士

【摘要】 近年来,嵌入式系统广泛应用于各种电器产品、智能仪表和控制设备中,随着Internet的日益普及,人们迫切需要将嵌入式系统接入到Internet上,实现大范围的信息传输和监控。因此,嵌入式与Internet的结合是一种必然的趋势。基于嵌入式Internet的远程监控系统是信息网络与控制网络结合的产物,它借助网络完成监视与控制任务,将监控范围扩展到更广的空间,进一步推进了控制技术向网络化、分散化和开放化发展。目前,基于嵌入式Internet的远程监控系统已经成为工控领域研究的一个热点。 本文在分析、研究了嵌入式Internet、CAN总线和uClinux操作系统的基础上,从应用出发,提出了远程监控系统模型和接入系统模型的设计设想,并实际完成了应用模型的搭建和软硬件的设计。同时,为了适应工控领域中远程监控系统在数据传输实时性上的要求,对CAN总线网络和uClinux的实时性进行了深入研究,并提出了具体的改进设想。 全文主要的工作如下: 首先,对CAN总线、嵌入式Internet和uClinux操作系统进行阐述,并分析了远程监控系统的结构和监控模式,在此基础上,提出了基于嵌入式Internet的CAN总线远程监控系统的实现模型。同时,通过需求分析,给出了CAN总线接入Internet系统的硬件设计方案。 由于现在的仪表、传感器等底层设备一般都不具备CAN通信接口,不能直接连接到CAN总线上实现数据通信。本文接下来设计了一个CAN-RS232协议转换器用于将底层设备接入到CAN总线上,组建CAN总线控制系统。 然后,分析了CAN总线接入Internet系统的软件整体设计,详细描述了接入系统的软件核心——嵌入式web服务器,总结出嵌入式web服务器的实现方式,并在uClinux下实现了一个单进程web服务器。更多还原

【Abstract】 Recently, embedded system is widely used in electronic products、 smart instruments and control equipment. with the widespread application of Internet, we are crying for connecting the embedded system with Internet, so as to implement the information’s transmission and monitor. Therefore, it is an incontestable trend that the embedded technology and the Internet will combine together. The remote monitor and control system based on Internet is the combination of Information network and control network. It completes the monitor and control tasks based on network, by which the monitoring range can be greatly extended, and moreover the control technology will be more cyberized, more distributed and more open. Now, the remote monitor and control system based on embedded Internet has become the hot point on the industrial control researching filed.Based on the current development of embedded Internet、 CAN bus and uClinux operating system, the essay carries out the design of the whole system, accomplishes the hardware media and software. This remote monitor and control system can operate very well together in the laboratory. Second, adapting for the command of the real-time data transmission on the industrial control system, the essay researches the real-time capabilities for CAN network and uClinux operating system, and puts forward the improved conceives.The essay arranged as following:At first, the essay introduces the related technology in this essay: CAN bus、 uClinux operating system and embedded Internet technology, analyzes the structures and monitoring mode of the remote monitor and control system. Based on these, the essay designs a remote monitor and control system for CAN bus based on embedded system, and carries out the hardware model ofthe embedded system for the CAN bus connecting to Internet.At present, many control instruments(such as meters, transducers etc) without CAN bus interface exist on industry field, and they cannot connect with the CAN network to transmit data. For constructing the CAN bus control system, the essay designs a CAN/RS232 converter to connect the instruments to CAN network.Second, the essay analyzes the whole software’s implementation of the embedded system for CAN bus connecting to the Internet, designs the chief of the software: embedded Web server, and sums up the method to realize the Web server by practice, then, the essay implements a single process Web server in the uClinux operating system .Third, the essay sets up a remote monitor and control system composed of a embedded Linux apparatus, instruments> CAN/RS232 converter, so as to validates the feasibility of the system designLast,considering the high demand of real-time capability of data transmission in industry,the essay constructs a simple CAN network model by predigested the transmission process of the CAN frames, uses the classical queue theory to calculate the average delay of the CAN frames transmission in this model,and puts forward a improved conceive on SJA1000 controller.The essay also gives a conceive to improve the real-time capability for uClinux operating system.The essay combines the research and practice together. Based on the research conclusion, the essay carries out the practical model and realizes design of the software and hardware of the system in detail. All these work has significance on both theory and practice for the development of the remote monitor and control system for CAN bus based on embedded Internet.更多还原