基于CANopen协议的城轨车辆网络控制系统设计与实现

设计了一种基于CAN现场总线的城轨车辆网络控制系统,主控设备CPU831-TG运行CAP1131的图形化编程环境,通过CANopen网关从站与现场车辆设备进行通信,形成车辆分布式网络.分析了CANopen协议,详细说明了采用ARM7核处理器开发CANopen从站的硬件电路、软件设计流程以及从站节点的调试方法.     

基于ARM7核处理器的CANopen／RS485网关的原理与实现

CANopen总线是一种具有国际标准的总线。该总线具有很强的通用性和可靠性,并且在地铁和轻轨领域很快得到了推广应用。所研制的CANopen／RS485网关可完全满足各种RS485总线接口的设备和CANopen网络互联互通的需求,为加快推广CANopen总线在我国的应用具有很高的现实意义。     

某电控柴油机热冗余控制技术研究

设计了一种电控柴油机热冗余控制系统,该系统基于CANopen协议进行通讯,并对主站、负载驱动、总线、重要传感器以及控制器等都进行了冗余,保证在一个控制系统出现故障时仍可以保证柴油机的连续、稳定运行,大幅度提高系统运行的可靠性。最后在某型电控柴油机上进行了怠速空载和标定工况下热机切换试验,结果表明,切换过程平稳、可靠。     

EBH35型悬臂式掘进机遥控技术研究

EBH35型悬臂式掘进机非常适合于切割煤及半煤岩巷道,或者硬度低于f4的岩层。通过对掘进机遥控理论及应用的分析与研究,提出适合EBH35型掘进机可行的遥控方案。通过对掘进机的总体结构分析,根据系统的要求设计出基于CAN总线的总体遥控方案。遥控功能的实现需要解决远程控制箱设计、遥控控制系统设计两项关键技术。根据系统的输入输出要求选用HBC工业遥控器,并设计符合本项目的操作面板。车载控制器采用SPT-K系列控制器和显示模块,车载控制系统和遥控信号之间通过CANopen协议通讯,并编写遥控通讯程序。     

重庆单轨3号线网络监控系统国产化技术方案与实现

针对重庆单轨3号线车辆的网络监控系统国产化研制项目给出了一种基于CANopen总线构架的网络监控系统方案,并对该方案进行了深入分析和探讨。     

引入自愿协议模式探讨

本文叙述了国外实施自愿协议的做法和经验及自愿协议的特点,并在借鉴了国外自愿协议成功经验的基础上,对在我国工业领域内示范和推广自愿协议的模式进行了探索。     

智能变电站并行冗余协议系统测试方案探讨

随着变电站自动化技术的不断发展,并行冗余协议已在国内得到部分应用,但还没有相对统一的测试方案。为了测试并行冗余协议的可靠性和实时性,并结合IEC 61850GOOSE规约,提出了一个系统化的并行冗余协议测试方案,并详细介绍了并行冗余协议的测试方法,为国内并行冗余协议的测试作为参考。     

中国乡镇企业能效自愿协议活动初探

能效自愿协议是行业组织或企业以节能和减排温室气体为目的自愿与政府签订的一种协议。中国乡镇企业普遍工艺落后,能源效率低,节能潜力巨大。本文借鉴国内外自愿协议经验,通过对GEF在中国乡镇企业示范项目实施过程具体分析,提出了加强宣传教育、制定优惠政策和发挥行业协会作用等在乡镇企业推广自愿协议有益建议。     

船用柴油机冗余CANopen过程数据对象可调度性与一致性问题研究

针对热冗余通讯在增加船用柴油机电子管理系统通讯可靠性时,默认及冗余总线在不同的抖动下存在数据接收方无法接收两路CAN总线报文的问题,提出以时间戳报文统一系统内所有节点的时间信息,以X+n/Y×TInhibit的偏移量作为异步通讯周期发送的起始时间,以X/Y×TInhibit为时间窗长度,将所有过程数据对象(PDOs)放入不同的时间窗内发送,降低瞬时负荷率,增强可调度性;提出最大延迟时间检测方法,提高两路数据的一致性。通过试验对比冗余CANopen的两种传输模式,结果表明,该方法能有效提高数据的可调度性和一致性。     

节能自愿协议:调查与法经济学分析

新修订的《节约能源法》把节能作为基本国策,创新了节能自愿协议这一市场化节能机制。作为特殊行政合同的节能自愿协议有公共利益性、自愿性特点。从对北京、山东、浙江、上海等省市实际调研结果看,节能自愿协议实施中的成果和缺陷并存。缺陷表现在协议客体难以达成,主体权利义务边界不清晰,协议的义务本位性导致激励不相容,违约责任制度形同虚设,协议适用范围窄。如何应用市场化的节能机制实现"十二五"及将来国家节能减排目标仍然是亟待解决的现实课题。     

基于生成对抗式网络的Modbus协议安全性测试方法

Modbus协议作为一种在电力系统中应用广泛的通信协议,保证Modbus协议的正确应用与实现有利于保障电力系统的安全。基于此,提出一种基于生成对抗式网络的Modbus协议实现安全性模糊测试方法,通过应用生成对抗式网络架构训练Modbus通信指令生成模型。训练所得生成模型作为Modbus协议测试数据生成器,用于生成测试数据对Modbus设备进行模糊测试。对多种Modbus模拟器进行了测试,结果表明,本方法能够发现Modbus模拟器的漏洞。因此,提出的方法是一种有效的并且有良好应用前景的Modbus协议实现安全性测试方法。     

基于Modbus协议的DCS系统与PLC系统的通讯

本文主要讨论Honeywell PKS系统与Tricon PLC之间通过Modbus协议进行实时通讯的开发与应用,介绍了Modbus协议的特点,对两系统的结构、硬件配置和软件组态方面作了较为详细的说明.     

基于多协议转化分层分布数据库的农村水电站监控系统设计与应用

针对农村水电站计算机监控改造过程中监控系统大型化、现地控制安全可靠性低、多种智能设备通讯协议不一致等问题,基于GE Cimplicity 组态软件的HMI Plant Edit框架,采用Microsoft SQL 2000 数据库分层分布式技术和协议转化技术,设计了基于多协议转化分层分布数据库的农村水电站监控系统。遂昌县应村水电站的应用实践表明,该组态软件框架编程简单、实用、省时、投资成本低,安全可靠。     

CAN总线在机舱自动化中的应用

CAN(controlareanetwork)总线协议是由德国BOSCH公司推出的数据通信协议,采用8字节的短帧结构,双绞线为传输介质,具有传输时间短,抗干扰能力强的特点。阐述了基于CAN总线的机舱自动化系统的组成、特点和发展趋势。     

Development of a model evaluation protocol for CFD analysis of hydrogen safety issues the SUSANA project

The “SUpport to SAfety aNAlysis of Hydrogen and Fuel Cell Technologies (SUSANA)” project aims to support stakeholders using Computational Fluid Dynamics (CFD) for safety engineering design and assessment of FCH systems and infrastructure through the development of a model evaluation protocol. The protocol covers all aspects of safety assessment modelling using CFD, from release, through dispersion to combustion (self-ignition, fires, deflagrations, detonations, and Deflagration to Detonation Transition - DDT) and not only aims to enable users to evaluate models but to inform them of the state of the art and best practices in numerical modelling. The paper gives an overview of the SUSANA project, including the main stages of the model evaluation protocol and some results from the on-going benchmarking activities.     

SAE J1939协议开发及其在高压共轨系统中的应用

SAE J1939协议是中重型道路车辆上控制器局域网的通用标准,本文实现了SAE J1939协议中除了网络层以外的所有基本功能,并在基于Infineon C167平台上完成与高压共轨系统控制软件的集成,通过CANoe软件模拟测试和连接CAN总线汽车仪表实际测试表明,所开发的协议实现了所有预期功能。     

Reliability of commercially available hydrogen sensors for detection of hydrogen at critical concentrations: Part I – Testing facility and methodologies

A facility for testing the performance of hydrogen safety sensors under a wide range of ambient conditions is described. A specific test protocol was developed to test sensors under conditions which could reasonably be expected during the sensors' service life. The tests were based on those described in IEC 61779 and were adapted following consultation with car manufacturers and after careful consideration of the sensors expected service environmental conditions. The protocol was evaluated by using it to test a large number of commercially available sensors. Observations made and experience gained during the testing campaign allowed the test protocol to be fine-tuned bearing in mind the sensor performance and behaviour during tests. The result of this work is an experimentally evaluated methodology which may be used as a guideline for testing the suitability of hydrogen sensors for automotive applications.     

A standardized biohydrogen potential protocol: An international round robin test approach

Hydrogen production by dark fermentation is an emerging technology of increasing interest due to its renewable feature. Recent scientific advances have well investigated the operational conditions to produce hydrogen through the valorization of several wastes or wastewaters. However, the development of standardized protocols to accurately assess the biohydrogen potential (BHP) is of crucial importance. This work is the first interlaboratory and international effort to validate a protocol estimating hydrogen potential using batch tests, using glucose as individual model substrate. The repeatability of the hydrogen potential (HP) increased with variations of the proposed protocol: reducing substrate concentration, increasing the buffer capacity, and using an automatic device. The interlaboratory variation of the HP was reduced from 32 to 12%, demonstrating the reproducibility and robustness of the proposed protocol. Recommendations to run BHP tests were formulated in terms of i) repeatability and reproducibility of results, ii) criteria for results validation and acceptance, iii) workload of the proposed protocols.     

发动机电控系统的CAN总线通信设计与开发

作为通信速率高达1Mbps的多主总线式串行数据通信方式，CAN总线为发动机电控系统的在线标定、实时监测提供了快速可靠的通信保障，同时可方便地与其它车载控制器构成CAN总线通信网络。本文介绍了CAN总线通信接口的基本结构和通信协议，以MC68376在片CAN控制器为例介绍了发动机电控系统采用SAE J1939通信协议实现CAN总线通信的设计要点。     

A rapid and simple protocol for evaluating biohydrogen production potential (BHP) of wastewater with simultaneous process optimization

Biohydrogen production utilizing negative valued waste through dark-fermentation process is one of the emerging areas. Reported conditions for H₂ production are significantly variable and comparative analysis of data is major problem for unified understanding. A simple, rapid and generalized two phase methodology/protocol was developed to evaluate the biohydrogen production potential (BHP) of negative valued wastewater as substrate/feed-stock for renewable biohydrogen production using mixed consortia. Critical factors that can influence the overall process viz., redox condition, organic load and biocatalyst were considered in the designing the methodology. Feasibility of protocol was initially evaluated with synthetic wastewater and further validated with real field composite food and slaughter house wastewaters. The selected operational factors showed marked influence on both H₂ production and wastewater treatment. The reported methodology/protocol not only provides the ability of selected wastewater to generate H₂ but also facilitates process understanding based on selected factors and finally acquiesce optimum conditions.