汽车动力学稳定性控制系统研究现状及发展趋势

汽车动力学稳定性控制系统(DSC)是汽车主动安全电控系统的重要研究前沿,是继ABS之后需要进行重点突破的汽车主动安全控制系统。收集、整理并研究了国内外关于DSC的研究文献和开发的产品,系统总结了DSC研究的关键问题:系统建模、控制策略、控制器开发、性能评估等4个方面的研究现状,为DSC研发提供参考。     

宝马745Li汽车车载网络系统简析

随着汽车电子装置和电控单元的不断增多,利用数据总线构建车载网络系统,实现多路传输已经成为必然趋势。在介绍宝马745Li汽车车载网络系统的组成及特点的基础上,分析了车载网络系统的工作原理和控制流程,最后阐述了车载网络系统的故障诊断方法与步骤。     

车用控制器局域网中网关的特性分析

控制器局域网中网关工作的好坏决定了不同的总线、模块和网络相互间通信的好坏。本文详细阐述了网关的特点和功能,并对网关在奥迪A4-B6车用控制器局域网(CAN)中的作用作了详细说明。     

基于CAN总线轨道列车门控器的设计

分析了轨道列车门控器的功能特点,针对目前使用中的门控器存在的不足,遵循嵌入式系统的设计方法,研制了一套网络化、模块化的新型轨道车辆门控系统,并在此基础上实现了一些基本的车门控制功能。该新型轨道车辆门控系统中构建的门控系统网络,极大地延伸了传统门控器的功能,使系统具有了更高的可靠性和灵活性,能够满足日新月异的轨道交通运输行业对车辆门控系统提出的要求。     

基于工程机械控制器HC-G15的圆捆机电气控制系统设计

文章根据9YG-1.25圆捆机的工作流程,设计了基于工程机械控制器HC-G15的电气控制系统.并在此基础上采用CoDeSys和组态软件分别开发了圆捆机控制系统和监控系统程序.通过实际运行表明,该圆捆机的电气控制系统工作可靠,操作控制方便.     

基于PLC的U型管焊接控制系统的设计与应用

大型管式热交换器U型管的焊机存在操作复杂、不稳定、效率低以及操纵不便等不足,为提高可操作性和稳定性,本文构建了基于可编程控制器(PLC)的控制系统。该系统可实现对步进电机对焊接头正反转的速度及直流电机对进丝速度的控制,完成对U形管焊接,同时可与上位机进行数据交换。应用结果表明,与传统方式相比,该系统有更好的可操作性能,而且性能稳定,大大提高了生产效率。     

通用型伺服液压缸测试系统设计与研究

为满足企业对液压缸产品测试的可靠性与自动化需求,对液压缸综合性能测试台的测控系统进行了研究与设计,满足企业需求,提高生产效率,保证生产质量。通过伺服液压缸对被测试缸加载,结合被测缸自身测试功能,通过PLC可编程控制技术对油路中各个阀体的控制,测试液压缸产品的各项性能,提高检测精度试验台的设计,以及巧妙的工装设计,提高测试台的通用性。实验台机械结构紧凑,布局合理,一目了然,便于操作,便于检查维修,模块化设计的实验系统具有良好的开放性和可拓展性。     

PLC在输煤控制系统中的应用

采用ABControlLogix1756系列产品PLC实现了对输煤过程的控制,通过建立以太网环网和双缆双网的控制层网络ControlNet以及主机的双机热备提高了系统的可靠性。利用GEiFixSCADA上位机监控软件实现了对输煤与配煤系统的监视和控制。     

Dynamic modeling and control of pressure dyeing machine’s running roller system

Key factor determining production quality is the deformation control between running rollers of pressure dyeing machine during the operation. Currently the industrial communities try to alleviate the defects by taking experiments. This study aims to approve theoretical practicality of providing controller and its parameters suitable to abolish vibration displacement in operating pressure dyeing machine in order to improve pressure dyeing quality and lengthen machine’s life. Firstly, the dynamic equation of the pressure dyeing machine’s running roller is derived and its corresponding open-loop transfer function is obtained from modal summation method. Then, the root locus method is used to design a controller which is realizable in the industrial communities. Simulation indicates that the designed controller not only can eliminate vibration response generated during pressure dyeing process and reducing greatly the previous process defects by making the two running rollers smoothly contact with each other. The solution is a high efficient way to ameliorate pressure dyeing process with low cost and easy access.     

Feeding requirements of sea bream (Sparus aurata) larvae under intensive rearing conditions: Development of a fuzzy logic controller for feeding

Applied methods for larval rearing suffer from the difficulty of accurately predicting larvae quantitative feeding requirements for optimum growth. Even when known, requirements change according to the behavior of each population reared. Computer based feeding systems require tools for adapting the delivered amounts of food to the needs of the reared population. In this work the daily feeding requirements of sea bream (Sparus aurata) larvae were estimated, and based on these estimations a fuzzy logic controller (FLC) for feeding was designed and developed. Sea bream larvae were reared, in triplicate, under intensive conditions in a pilot scale rearing system for 20 days with the pseudo-green water method. Larvae reached 6.7±0.6 mm (mean value and S.D.) at the end of the experimental period while the mean survival of the populations was 48.0±12.6%. Consumption was 0.017±0.009 mg of carbon per individual at first feeding and increased to 0.198±0.032 mg at day 20 post-hatching. The findings were used for the development of a FLC for feeding that adapts the amount of food delivered to the larvae according to changes in the reared population. The FLC utilizes five linguistic variables describing the state of the population and a rule base composed of 316 rules. The developed FLC allows the use of computer based feeding systems during rearing of early larval stages.