基于CAN总线的通信系统的设计与实现

CAN总线是一种多主方式的串行总线。最初CAN总线被应用在汽车上,其目的是连接汽车上各个部件,并使其可以进行自由通信和控制。同时减少原始方法的复杂的布线,实现基于CAN总线协议的局域网通信。CAN总线局域网通信具有以下优点:具有高抗干扰性;具有较高的实时性;它应用简单,项目开发周期短。文中的工作是实现基于CAN总线协议的数据采集通信系统。通过利用CAN总线模块(Basic)实现单片机之间的基于CAN总线协议的通信。     

Self-organization of reconfigurable protocol stack for networked control systems

In networked control systems (NCS), the control performance depends on not only the control algorithm but also the communication protocol stack. The performance degradation introduced by the heterogeneous and dynamic communication environment has intensified the need for the reconfigurable protocol stack. In this paper, a novel architecture for the reconfigurable protocol stack is proposed, which is a unified specification of the protocol components and service interfaces supporting both static and dynamic reconfiguration for existing industrial communication standards. Within the architecture, a triple-level self-organization structure is designed to manage the dynamic reconfiguration procedure based on information exchanges inside and outside the protocol stack. Especially, the protocol stack can be self-adaptive to various environment and system requirements through the reconfiguration of working mode, routing and scheduling table. Finally, the study on the protocol of dynamic address management is conducted for the system of controller area network (CAN). The results show the efficiency of our self-organizing architecture for the implementation of a reconfigurable protocol stack.     

Boosting the Robustness of Controller Area Networks: CANcentrate and ReCANcentrate

This paper discusses two proposed star architectures for systems based on the controller area network (CAN) protocol aim to improve CAN's error containment and fault tolerance for general distributed embedded systems and safety-critical applications.     

基于CAN总线的分布式程控电镀电源控制系统

CAN总线是一种使用CAN协议的串行通信网络.Silabs公司的单片机C8051FU40是完全集成的混合信号系统级芯片,而且内部集成了CAN控制器.本文着重介绍以C8051FU40单片机为核心的基于CAN总线的分布式程控电镀电源控制系统的设计和实现方法,给出CAN总线的硬件接口电路设计和电镀电源的逻辑原理结构图.     

Variable structure controller with neural compensator

This paper proposes a new variable structure controller combined with a multilayer neural network using an error back-propagation learning algorithm. The neural network acts as a compensator for a conventional variable structure controller in order to improve the control performance when the initial assumptions of the uncertainty bounds of the system parameters are violated. Also, the proposed controller can reduce the steady-state error of a conventional variable structure controller using the boundary layer technique. Computer simulation results show that the proposed method is effective in controlling dynamic systems with unexpected large uncertainties.     

面向安全关键系统的CAN总线应用研究综述*

控制器局域网适合小型安全关键系统的现场总线控制要求,能够以最大1Mbps速率发送和接收实时短消息。分析了CAN总线的结构、特点、协议仲裁机制、接口设计方法、实时特性和错误处理机制。为了支持任务关键网络,比较了事件触发协议与时间触发协议的特性,讨论了时间触发CAN协议的研究进展。     

控制器局域网络的音频信号传输

控制器局域网络(CAN)是实时嵌入式系统中传输短报文的串行通信协议,其通讯最高速率可达1Mbit/s。CAN在传输实时数据中有大量的应用,但在传输音频流上并未普及。针对在CAN总线上除了发送报文同时开通音频信道而具有的优点,举例说明了在系统带宽上引入音频信道的效果。     

基于PIC18F458的车载CAN总线仪表系统

在研究CAN总线协议原理及技术的基础上,针对车载仪表实际应用的需要,给出了系统的总体设计,并有针对性地提出了一种CAN总线应用层协议,在标准帧的仲裁域中定义了报文的优先级和地址,实现了CAN报文以点到点和广播地方式在网路中的传播,在实际应用中取得了较好的效果。     

CAN总线的时间触发调度方法及实验研究

借鉴TTCAN总线时间触发机制和静态调度特点，利用微控制器的硬件周期中断，结合软件编程，提出一种充分利用了CAN 2.0 总线位仲裁特点的时间触发方案，并对以该方案进行数据传输时的总线带宽利用率和传输误码率进行了模拟实验研究．结果表明：将CAN总线和微控制器的周期中断相结合，可以利用CAN 2.0 总线实现时间触发型应用，并获得较高的带宽利用率，该方案可应用于分布式数据采集系统等传输大量周期数据和少量非周期数据的场合．     

一种空间相机的数据通信系统设计

在空间相机数据采集应用中,为了满足电路板体积重量以及可扩展性的要求,利用FPGA 作为主控芯片,控制相机进行数据采集和传输.在数据通信系统中,FPGA替代了传统的单片机作为CAN总线的主控制器,并给出了详细的硬件电路设计方法.在对CAN协议控制器SJA1000进行功能及时序分析后,利用硬件语言对其通信流程进行设计.实践...     

CAN FD总线在交通信号控制系统中的应用设计

结合交通信号控制系统现状，提出了一套基于CAN FD总线的交通信号控制系统的研究方案，用于解决复杂交通路口多设备间的通信问题。该系统通过CAN FD总线将系统中所有设备连接起来，实现系统间各设备间正常的数据交互，以控制主机和交通信号灯驱动控制器间的通信。设备均采用内置CAN FD控制器的STM32H743系列单片机作为主控制器，在此基础上自定义了CAN FD总线应用层协议，构成了一个完整的系统间通信方案。测试结果表明，此系统可靠性高、实时性强、抗干扰能力强、出错率低，具有良好的应用前景。     

A network interface device for networked control system with time-driven mode

Network-induced imperfections such as transmission delays, time-varying sampling intervals and clock asynchronization among nodes make it complicated to analysis and design a networked control system (NCS). Further, constructing such an NCS becomes tedious and difficult when there are a number of nodes needed to be integrated together through the imperfect network. In this paper, to solve these problems, we design and develop a network interface device termed as information pipeline CAN (IPCAN) that can facilitate rapid integration of network nodes and provide well-designed transmission properties. The IPCAN adopts information pipeline technology (IPT) to construct an endpoint-based data interface, which makes nodes modular and reusable. A time-triggered information-exchange mechanism is proposed for the IPCAN to achieve fixed and predictable transmission delays and temporal-spatial consistency of received data. These properties contribute to realizing synchronous time-driven mode among nodes and simplifying the analysis of the system. In addition, several novel technical methods are proposed to implement the IPCAN with controller area network (CAN) and serial peripheral interface (SPI) as the physical connections of network and user interface, respectively. The IPCAN is applied to a distributed temperature control system and its utility and performance are well demonstrated.     

CAN数据传送的实时性研究及其应用

设计了一个新的基于时分的主从式和基于优先级的分布式信息调度子系统来处理周期性和猝发性的数据传输, 解决CAN现场总线在网络带宽利用率高时，数据传输的实时性和确定性存在的问题，以及不同优先级的信息帧不能同等地共享总线带宽的问题． 这种方法参考了数据通信中的时分原理，并考虑到CAN基本协议的特点． 在网络带宽利用率达到83％时，保证了信息的实时传送． 这种方法已经应用在实际的陶瓷辊道窑监控系统中，它的有效性得到了证实．     

CAN总线在逆变电源模块通信中的应用

分析了目前广泛应用的TI公司TMS320C2000X系列芯片中内嵌CAN控制器的特点，介绍了CAN总线在分布式逆变电源模块控制器问通信的系统设计与实现，并在其基础上重点介绍了控制器以及PC机与CAN总线接口的硬件设计和应用层协议软件的设计思想。     

CAN总线在组合机床电控系统通信中的应用

本文分析了目前广泛应用的TI公司TMS320C2000X系列芯片中内嵌CAN控制器的特点，介绍了CAN总线在组合机床电控系统间通信的系统设计与实现，并在其基础上重点介绍了控制器以及PC机与CAN总线接口的硬件设计，和应用层协议软件的设计思想。     

基于死区调度的无线网络控制系统保性能控制器设计

针对无线网络控制系统(WiNCS)中网络带宽有限、节点能量有限、网络冲突概率高和节点动态移动的特点,提出了基于系统误差的死区调度策略,即只在系统误差绝对值大于死区阈值时才进行控制量的计算和传输.将死区调度描述为一个非线性函数,并在考虑系统参数不确定性和网络诱导时延的情况下,建立了基于死区调度的无线网络控制系统模型.利用Lyapunov-Krasovskii方法,给出了保性能控制器的设计方法.仿真实验结果表明所提方法在保证控制性能的基础上有效地降低了控制器的数据传输率.     

面向无线传感器节点的集成CAN总线芯片设计

根据CAN(Controller Area Network)总线国际标准协议(ISO11898)完成了一款应用于无线传感器节点的集成CAN总线芯片设计,提高无线传感器节点的集成度与可靠性.采用混合信号集成电路设计技术实现了CAN总线控制器芯片与收发器芯片的集成,最终采用Global Foundry的0.35 μm CMOS工艺进行设计并流片,芯片面积为4 mm2.芯片测试结果表明,该芯片设计符合标准协议规定,通信速度最高为1 Mbyte/s,与商用CAN总线通信芯片正确通信,可方便地应用到无线传感器CAN总线通信系统中.     

Controller area network (CAN) for computer integrated manufacturing systems

Communication acts a central role in computer-integrated manufacturing (CIM). The choice of communication system widely determines the capability and productivity of a factory as a whole. Moreover, in the implementation of CIM systems, the costs associated with the interconnection of the individual CIM components are very important. In CIM, communication is largely used to control programmable manufacturing equipment. Here, the time requirements are high, and error-free data transmission is a necessity. Fieldbuses are special form of local area network dedicated to applications in the field of data acquisition and the control of sensors and actuators in machines or on the factory floor. Many fieldbus standards exist in the market today. Each of them has been invented at different periods by different companies and for different purposes. Controller area network (CAN) is one of the most popular fieldbuses. The highest advantages of CAN are its low cost, abundance of silicon technology, and reliability in networking multiple real-time systems. CAN is a multimaster bus topology and has shown to be very efficient medium for error detection and fault tolerance. CAN's technical specifications are defined in the ISO/OSI network layer spans just two layer of the model. CAN specifies, in many innovative ways, the physical signaling over the media, data formats, timing, error recovery, protocols and arbitration. It does not define the media itself and its connectors, and also the upper layers (usually software) of the model.