车用氧传感器的使用与维护

简述了氧传感器的功能,构造、工作原理及其类型,分析了氧传感器的故障原因,指出了氧传感器的故障诊断与维修方法。     

一种汽车用氧传感器的研制

研制了一种适用于电喷汽车用氧传感器,传感器采用了新型的氧敏材料和优良的系统设计。对所研制的氧传感器进行了较系统的测试与分析,表明氧传感器具有良好的综合性能,能较为精确保证汽车发动机理想的空燃比,使整车排放达到欧洲2号法规。     

汽车空气流量质量传感器的分析

对车用空气质量流量传感器的发展现状、类型和未来发展进行了详细的分析。首先分析了电子工业在汽车上的发展,电子工业的发展给汽车工业带来了质的跳跃。接着分析了空气流量传感器对电控发动机的重要性,并对比了不同类型的空气流量传感器。随着电子工业的进一步发展,对空气流量传感器有了更高的要求,而MEMS成为未来空气流量传感器的发展方向。     

氧化锆氧传感器在工业锅炉中的应用

介绍了氧化锆氧传感器的基本原理和燃煤工业锅炉送风控制系统，指出将氧化锆氧传感器和计算机技术应用到工业锅炉中，是减少燃煤工业锅炉的排放污染和降低运行成本最有效的办法。     

浅谈汽车空燃比传感器的性能特点与检修方法

随着汽车工业的发展,汽车保有量的不断增加,汽车节能减排技术越来越被人们所重视。汽车空燃比传感器能够自动检测不同工况下的汽车混合气浓度,并通过电脑进行自动调节,是节能减排技术的重要应用。通过近期教学实践和维修实践过程中的不断总结,通过空燃比传感器的结构原理和检修方法进行叙述,以解决在维修作业中空燃比传感器的技术问题。     

汽车氧传感器的检测与维修

针对电喷发动机怠速运转不稳的故障现象,将KES-200便携式发动机分析仪和X-431汽车诊断仪结合使用,通过对氧传感器的检测以及读故障码、读数据流和信号波形分析,找出故障原因,确认故障部位,予以排除故障,提高汽车检测与维修的品质和效率。     

我国汽车排放控制水平现状及综合对策探析

我国的经济以及城市化进程一直在加快,汽车工业也得到了非常迅速的发展,进而汽车已经成为了生活当中非常重要的交通工具.因此,汽车尾气就会对大气造成非常严重的污染,从而对我们的生活造成危害.因此,相关部门采取了针对性的对策,在废气排放治理以及改善空气污染方面取得了一定的成效.但是,在排气控制方面仍然存在一定的问题,本篇文章主...     

浅论汽车排放控制

从汽车发动机内、外部净化措施及汽车保修、驾驶、油料使用、宏观调控等方面,较为深入地探讨了控制排放的措施。     

汽车用氧传感器介绍与研究进展

介绍了汽车用氧传感器的原理、结构、发展情况及国内外研究新动向，并简要分析了其发展趋势。汽车尾气中的有害物造成的污染，给人类赖以生存的大气环境带来了越来越严重的危害。发达国家从六、七十年代就开始探索汽车尾气净化的途径，并取得了非常满意的净化效果。在我国，无铅汽油已经开始推广使用，但还只是汽车尾气净化工程的一个开端，相关的研究工作还需要全面展开。汽车用氧传感器在控制汽车尾气排放、节省燃料、净化空气中起着重要的作用。经掺杂稳定的立方相氧化锆（ZrO2)固体电解质材料，具有良好的高温氧离子导电性，是制造汽车用氧传感器的关键部件。氧传感器有氧浓差型和极限电流型类型，国内汽车用氧传感器的研究和制造已达到一定的规模，国外新近还研究出了一种化学扩散障型氧传感器。     

网络控制系统的简要回顾及展望

随着网络控制系统的迅速发展,网络的引入而产生的网络不确定性问题给网络控制系统的分析和设计带来了挑战.在此时机,本文首先阐述了网络控制系统出现的背景以及存在的基本问题.然后,着重从网络控制系统的被控对象和建模、控制策略和稳定性分析、调度策略、网络架构以及应用前景方面对网络控制系统的一些研究进展进行了回顾.在此基础上,对网络控制系统的某些发展方向予以展望.希望为刚入这一领域的研究人员提供一些较全面的参考信息.     

Improved stabilization method for networked control systems with variable transmission delays and packet dropout

This paper investigates the problem of stability analysis and stabilization for networked control systems with the network-induced delay and data dropout. In order to obtain less conservative results, a novel augmented Lyapunov–Krasovskii functional is introduced and new free-weighting matrices are employed to make some extra degrees of freedom in the sufficient stabilizability condition. The gain of the memoryless state-feedback controller is computed by solving a set of linear matrix inequalities (LMIs). Illustrative examples are given to verify the applicability and outperformance of the proposed method compared to the existing approaches in the literature.     

长度检测微机控制系统的开发与设计

本文介绍了弹头（壳）长度检测分选微型计算机控制系统的开发与设计,以及微机控制的特点及优点.重点讲述了长度检测自动分选功能的软件实现思想.     

Static and low order anti-windup synthesis for cascade control systems with actuator saturation: An application to temperature-based process control

In this paper, a new framework for designing static and low order anti-windup compensator (AWC) for industrial cascade control systems with actuator saturation constraint is presented. Based on less conservative block diagonal quadratic Lyapunov function, sector boundedness, decoupled architecture, norm reduction and cascade loop compensation, linear matrix inequalities are developed which guarantee stability and suitable performance for overall closed-loop system. Static AWC parameters are obtained by comparing the full order AWC architecture with generalized architecture for cascade control system. Low order AWC is designed by sub-optimal approach in which AWC weights are tuned by designer. Anti-windup compensator is divided into inner and outer loop compensators which compensate the effect of saturation at each level. It is observed that the proposed methodology is less conservative than the traditional AWC schemes when applied to cascade control systems. The proposed scheme is successfully tested experimentally on a temperature-based process control system and results are outlined.     

钢板声发射时间反转聚焦增强定位方法

声发射检测方法具有实时动态监测优点,应用越来越广泛,但是对声源的定位始终没有更大的突破。在钢板声发射检测中,提出一种基于时间反转理论的声发射源准确定位的方法。由于声发射检测是一种被动检测技术,结合时间反转聚焦理论,推导出对声源信号实现时间反转聚焦增强处理方法,可增强检测信号中声源幅值,提高信噪比;然后根据声源信号到达时间推算出声源聚焦时刻,利用弹性波传播理论对传感器监测区域重建信号传播波动图,显示出声源位置和区域;最后通过实验测试对该方法进行验证,结果表明该方法能有效提高损伤声源信号的能量,对检测区域的信号重建和定位显示准确地给出损伤声源位置。     

基于IFIX的电厂灰渣监控系统的设计与实现

介绍采用PLC作为控制设备、工控机作为上位机的结构形式，基于iFIX软件提供的SCADA和HMI组件以及I／O驱动程序，开发了大唐许昌龙岗发电有限责任公司#1、#2炉灰渣石子煤集中监控系统，并保证了数据的高度完整性。运行结果表明，PLC控制可靠，调节精度高：上位机运行稳定，操作方便；整套系统具有较高的自动化水平。     

Robust decentralized hybrid adaptive output feedback fuzzy control for a class of large-scale MIMO nonlinear systems and its application to AHS

This paper presents a novel observer-based decentralized hybrid adaptive fuzzy control scheme for a class of large-scale continuous-time multiple-input multiple-output (MIMO) uncertain nonlinear systems whose state variables are unmeasurable. The scheme integrates fuzzy logic systems, state observers, and strictly positive real conditions to deal with three issues in the control of a large-scale MIMO uncertain nonlinear system: algorithm design, controller singularity, and transient response. Then, the design of the hybrid adaptive fuzzy controller is extended to address a general large-scale uncertain nonlinear system. It is shown that the resultant closed-loop large-scale system keeps asymptotically stable and the tracking error converges to zero. The better characteristics of our scheme are demonstrated by simulations.     

Optimised sensor selection for control and fault tolerance of electromagnetic suspension systems: A robust loop shaping approach

This paper presents a systematic design framework for selecting the sensors in an optimised manner, simultaneously satisfying a set of given complex system control requirements, i.e. optimum and robust performance as well as fault tolerant control for high integrity systems. It is worth noting that optimum sensor selection in control system design is often a non-trivial task. Among all candidate sensor sets, the algorithm explores and separately optimises system performance with all the feasible sensor sets in order to identify fallback options under single or multiple sensor faults. The proposed approach combines modern robust control design, fault tolerant control, multiobjective optimisation and Monte Carlo techniques. Without loss of generality, it's efficacy is tested on an electromagnetic suspension system via appropriate realistic simulations.     

Synthesis of feedback control elements for discrete event systems using Petri net models and theory of regions

This paper describes a method for constructing a Petri-net-based controller for a discrete event system (DES) modelled by a Petri net. Assuming that an uncontrolled Petri net model of the DES and a set of forbidden state specifications are given, feedback control elements, i.e. a set of places and related transitions, with initial marking, are computed using the theory of regions, which is a formal synthesis technique for deriving Petri nets from automaton-based models. When feedback control elements are added to the uncontrolled Petri net model, the controlled (closed-loop) Petri net model of the system is obtained. The controlled Petri net model obtained is maximally permissive while guaranteeing that forbidden states do not occur. The proposed method is computationally efficient and does not suffer from the state explosion problem. Two examples are provided to show the applicability of the proposed method.