Multi-model unfalsified adaptive switching supervisory control

The paper studies how on-line inferring stability of a potential control-loop consisting of an uncertain plant interconnected in feedback with a candidate controller using plant I/O pairs recorded while the plant is possibly driven by a different controller. In such a context, a convenient tool to work with is to resort to the conceptual entity of a virtual reference (VR). The adopted approach consists of embedding, in the so-called unfalsified adaptive switching control schemes based on VR, a family of nominal models pairwise associated with the given candidate controllers. The result is that the supervised switching mechanism can moderate the chance that destabilizing controllers be switched-on and, hence, reduce both the magnitude and time durations of “learning” transients after start-up, while, in contrast with pre-existing multi-model based methods, stability in-the-large is guaranteed under the minimal conceivable assumption that a stabilizing candidate controller exist.     

一种新的基于模糊控制的电梯群控策略

从乘客的角度出发，通过分析乘客需求，推导了乘客最大冲击次数的估算公式，提出了基于层站最长候梯时间和乘客最大冲击次数的一种新型电梯群控策略．该策略采用模糊控制设计，符合人们对电梯服务水平的语言级评价，仿真结果表明，乘客的乘梯时间和所经受的冲击次数较两种常规的群控策略有明显降低，为研究符合乘客利益的电梯群控系统奠定了基础。     

A performance optimization algorithm for controller reconfiguration in fault tolerant distributed model predictive control

This paper presents a performance optimization algorithm for controller reconfiguration in fault tolerant distributed model predictive control for large-scale systems. After the fault has been detected and diagnosed, several controller reconfigurations are proposed as candidate corrective actions for fault compensation. The solution of a set of constrained optimization problems with different actuator and setpoint reconfigurations is derived by means of an original approach, exploiting the information on the active constraints in the non-faulty subsystems. Thus, the global optimization problem is split into two optimization subproblems, which enable the online computational burden to be greatly reduced. Subsequently, the performances of different candidate controller reconfigurations are compared, and the better performing one is selected and then implemented to compensate the fault effects. Efficacy of the proposed approach has been shown by applying it to the benzene alkylation process, which is a benchmark process in distributed model predictive control.     

Predictive switching supervisory control of persistently disturbed input-saturated plants

Predictive switching logic schemes are considered whereby a feedback-gain is switched-on at any time from a family of candidate feedback-gains so as to control a discrete-time input-saturated LTI system possibly subject to persistent bounded disturbances of unknown arbitrary magnitude. It is constructively shown that such schemes do exist which ensure, along with good tracking performance, global asymptotic and semi-global exponential stability in the noiseless case, as well as finite l_∞-induced gain to the disturbance-to-state map, whenever the structure of the disturbed plant can make such properties conceptually achievable, viz., the disturbance which enters an Asymptotically Null-Controllable with Bounded Input (ANCBI) system acts directly only on the stable modes, while the critically unstable ones are indirectly affected by the disturbance only via the feedback controls. More generally, in ANCBI systems general disturbances of suitably bounded magnitude can also be handled by the scheme, provided that the switching logic be equipped with an appropriate hysteresis facility.     

Adaptive memory in multi-model switching control of uncertain plants

This paper describes some recent results in multi-model switching control. The scheme here considered embeds a finite family of pre-designed controllers and a high-level unit which selects, at each instant of time, the candidate controller to be placed in feedback to the uncertain plant. The study considers a switching strategy where controller selection is based on windowed cost functions. The key feature of the proposed strategy is that the window (the memory) is not kept constant, but, on the contrary, is adjusted on-line, on the grounds of measured data. The potential benefits of using an adaptive memory switching strategy are discussed and illustrated through a benchmark example.     

基于Maxim控制器的无刷电机控制系统的优化设计

分析了无刷电机控制中的非线性问题和解决方案;以MAX6650/MAX6651控制器为核心,设计了无刷直流电机控制系统,并对其电机转速控制及其电路做了详细的阐述;通过典型设计案例对控制系统进行了分析;对MAX6650/MAX6651控制器在电机控制应用中的可靠性做了概述。     

基于控制及信息协议的计算机监控通信软件

为使车间监控计算机通过以太网实现与PLC的可靠通信,选用以太网工业协议作为监控通信协议.分析了以太网工业协议的层次结构,指出CIP(控制及信息协议)中的显式消息传递方式适合作为监控计算机和PLC通信的协议.通信软件被设计为两层——基于以太网的CIP通信类和基于CIP通信类的监控通信类.CIP通信类提供了读写PLC各种内存变量的接口函数,采用互锁机制避免多线程操作中潜在的资源竞争冲突问题.监控通信类为应用程序提供向PLC发送命令和从PLC读取报告的接口函数和PLC状态的订阅服务.开发的通信软件已在某货物柔性处理线监控系统中应用.     

线性时不变系统的切换控制器设计及H2性能实现

在复杂的控制系统中,使用单一的线性时不变(linear time invariant, LTI)控制器不能有效地处理对象的动态变化或者满足系统更多的性能要求,基于此本文主要针对于一个LTI对象设计一个切换控制器,该切换控制器包含多个预先且独立设计的LTI控制器,所有的这些LTI控制器都能够使闭环系统稳定且满足相应H2控制性能准则.基于本文提出的H2性能状态空间实现方法,设计的切换控制器不仅可以保证在任意切换的情况下整个闭环系统满足某一H2性能,而且可以保证局部子系统的切换点满足相应的H2性能,仿真结果验证了方法的有效性.     

基于模糊控制算法的纯电动汽车空调控制器的研发

纯电动汽车迅速发展,要求其空调系统也急需跟进。根据纯电动汽车特点,开发出一种纯电动汽车空调控制器系统,设计了空调控制器的电源模块,阐述了使用无位置传感器控制压缩机无刷直流电机的原理,研发了一种过流检测电路。提出了一种新型控制方法,即：在考虑整车负载的基础上,使用多输入变量模糊控制算法对汽车空调压缩机电机进行控制,同时兼顾了乘员的舒适性与汽车的动力性。结果表明这种空调控制器运行良好,达到了预期效果。     

基于RSView32的交通灯监控系统的设计与实现

对交通灯控制系统的总体结构和功能进行了分析。利用RSView32的技术开放性优点，设计并实现了整个系统的重要组成部分——交通灯监控系统。控制者只需通过人机界面即可查看到系统运行的全过程，包括系统报警信息、实时趋势曲线以及历史数据记录，体现出了监控的真正意义。     

A fuzzy logic based supervisory hierarchical control scheme for real time pressure control

This paper describes a supervisory hierarchical fuzzy controller （SHFC） for regulating pressure in a real-time pilot pressure control system. The input scaling factor tuning of a direct expert controller is made using the error and process input parameters in a closed loop system in order to obtain better controller performance for set-point change and load disturbances. This on-line tuning method reduces operator involvement and enhances the controller performance to a wide operating range. The hierarchical control scheme consists of an intelligent upper level supervisory fuzzy controller and a lower level direct fuzzy controller. The upper level controller provides a mechanism to the main goal of the system and the lower level controller delivers the solutions to a particular situation. The control algorithm for the proposed scheme has been developed and tested using an ARM7 microcontroller-based embedded target board for a nonlinear pressure process having dead time. To demonstrate the effectiveness, the results of the proposed hierarchical controller, fuzzy controller and conventional proportional-integral （PI） controller are analyzed. The results prove that the SHFC performance is better in terms of stability and robustness than the conventional control methods.     

多无人机监督控制的人机动态功能分配研究

针对监督控制系统静态功能分配的不足,提出了一种基于操作员工作量的动态功能分配触发方法,实现了多无人机监督控制的人机动态功能分配。以单操作员控制四架无人机执行对敌防空压制任务为背景,设计开发了多无人机监督控制仿真平台,并进行模拟实验。实验中引入等待时间作为衡量系统性能的指标,结果表明动态功能分配降低了系统等待时间,提高了系统的整体性能。     

基于TCP/IP协议的分布式供热远程监控系统开发

本文介绍了一种基于TCP，IP协议的远程配置与监控系统．分析了该系统功能、特点以及软、硬件实现方法，讨论了一对一多通信的实施结构。以分布式供暖系统为例，建立了基于C/S模式的远程工作参数配置及工况监控系统，实施效果安全可靠。     

基于CAN总线的电子控制单元功能测试方法

随着汽车电子市场的快速发展,汽车控制器的电子控制单元(ECU)已越来越多,对ECU的功能测试也变得日趋复杂。为解决车载ECU功能测试,研究了基于控制器局域网络(CAN)的ECU自动测试方法。以NI公司的软硬件为开发平台、CAN总线为通信平台搭建测试系统与被测ECU形成闭环结构。通过CAN总线传输测试信息,可实现对同型号ECU的批量测试。此系统采用了新的测试方法来降低测试误差,并支持ECU的流水线测试,大大降低了测试的复杂度,减少了工作量。同时,在完善仿真信号产生模块和测试模块用例库后,也能适用于其他类型ECU的功能测试。     

事件反馈与状态反馈的混合模监控

在监控理论中 ,处理状态膨胀的标准方法之一是基于语言或谓词的模监控 .但文献中没有涉及同时基于语言与谓词的混合模监控 .本文研究混合模监控综合及其性质 .通过提出状态反馈与某一事件反馈的等价关系 ,给出了两者相连接的定义 ,进而得到了混合模监控器等价于子监控器与子控制器的连接 .并讨论了混合模监控器具有非阻塞性与无死锁性所满足的条件 ,即基于语言的闭环系统行为的封闭性与谓词的Σu-不变性 ,而其是无死锁的充要条件是子监控器与子控制器必须均是无死锁的并满足d-不变关系     

一种基于监控理论的软件设计方法:状态性质变换方法

基于把离散事件系统监控理论用于软件设计的思想,本文中对软件设计的状态性质变换方法作了详细的讨论,给定一个系统,其每一个状态的性质都是确定的,当提出软件需求时,常常是对系统状态的性质提出需求,为设计出满足需求的系统,可以首先按照是否满足该性质对系统状态进行分类,再对不满足该性质的状态控制其可控事件的发生从而改变其性质使之满足要求的性质。本文将这种方法用于软件需求是不变性或可达性时的软件设计问题,通过和已有文献中结论的比较,显示了这种设计思想的广泛适用性和优点,也验证了软件控制论这一思想的可行性。     

种基于监控理论的软件设计方法：状态性质变换方法

基于把离散事件系统监控理论用于软件设计的思想,本文中对软件设计的状态性质变换方法作了详细的讨论. 给定一个系统,其每一个状态的性质都是确定的. 当提出软件需求时,常常是对系统状态的性质提出需求.为设计出满足需求的系统,可以首先按照是否满足该性质对系统状态进行分类,再对不满足该性质的状态控制其可控事件的发生从而改变其性质使之满足要求的性质.本文将这种方法用于软件需求是不变性或可达性时的软件设计问题,通过和已有文献中结论的比较,显示了这种设计思想的广泛适用性和优点,也验证了软件控制论这一思想的可行性.     

A bound on closed-loop performance based on finite-frequency response samples

A new, computationally tractable, bound is derived for the level of closed-loop performance achieved by a given finite-dimensional feedback compensator with a plant for which a finite number of frequency response samples are computable. The bound involves quantities reflecting the performance of the controller with a finite-dimensional, nominal model of the plant, quantities that can be determined from the finite number of frequency response samples of the true plant, and quantities related to the complexity (in the sense of Vinnicombe) of all systems involved. This bound can be used to ‘validate’ closed-loop performance in the case that the true plant frequency response samples are of a plant which is not completely known or, to measure the performance of a finite-dimensional controller with a computationally intractable (e.g. infinite-dimensional) model of the true plant.     

基于组态软件的仿真变电站监控系统的实现

本文以“南昌500kV变电站培训仿真系统”为例，介绍了采用组态软件为平台来实现仿真变电站监控系统的数据交换与监控功能。