基于单片机的火灾探测和监控系统-外文文献翻译.docx

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1、外文文献原稿和译文原稿Multiple single-chip microcomputer approach tofire detection and monitoring systemA.J. AI-Khalili, MSc, PhDD. AI-Khalili, MSc, PhDM.S. Khassem, MScIndexing term : Hazards, Design, Plant condition monitoringAbstract: A complete system for fire detection and alarm monitoring has been propos

2、ed for complex plants. The system uses multiple single chip architecture attached to a party line. The control algorithm is based on a two-level hierarchy of decision making, thus the complexity is distributed. A complete circuit diagram is given for the local and the central station with requiremen

3、ts for the software structure. The design is kept in general form such that it can be adapted to a multitude of plant configurations. It is particularly shown how new developments in technology, especially CMOS single chip devices, are incorporated in the system design to reduce the complexity of th

4、e overall hardware, e.g. by decomposing the system such that lower levels of hierarchy are able to have some autonomy in decision making, and thus a more complex decision is solved in a simple distributed method.1 Detection and alarm devicesA basic fire detection system consists of two parts, detect

5、ion and annunciation. An automatic detection device, such as a heat, smoke or flame detector, ultraviolet or infrared detectors or flame flicker, is based on detectingthe byproduct of a combustion. Smoke detectors, of both ionization and optical types, are the most commonly useddetector devices. Whe

6、n a typical detector of this type enters the alarm state its current consumption increasesfrom the pA to the mA range (say, from a mere 15pA in the dormant mode to 60 mA) in the active mode. Inmany detectors the detector output voltage is well defined under various operating conditions, such as thos

7、egiven in Table 1. The more sensitive the detector, the more susceptible it is to false alarms. In order to control the detector precisely, either of the following methods is used: a coincidence technique can be built into the detector, or a filtering technique such that a logic circuit becomes acti

8、ve only if x alarms are detected within a time period T. The detection technique depends greatly on the location and plant being protected; smoke detectors are used for sleeping areas, infrared or ultraviolet radiation are used when flammable liquids are being handled, heat detectors are used for fi

9、re suppression or extinguishing systems. In general, life and property protection have different approaches.Alarm devices, apart from the usual audible or visible alarms, may incorporate solid state sound reproduction and emergency voice communication or printers that record time, date, location and

10、 other information required by the standard code of practice for fire protection for complex plants. Heaviside 4 has an excellentreview of all types of detectors and extinguisher systems.1.1 Control philosophy and division of labourOur control philosophy is implemented hierarchically. Three levels o

11、f system hierarchy are implemented, with two levels of decision making. There is no communication between equipment on the same level. Interaction between levels occurs by upwards transfer of information regarding the status of the subsystems and downwards transfer of commands. This is shown in Fig.

12、 1 where at level 1 is the central station microcomputer and is the ultimate decision maker (when not in manual mode). At level 2 are the local controllers, which reside in the local stations. At level 3 are the actual detectors and actuators. A manual mode of operation is provided at all levels.Inf

13、ormation regarding the status of all detectors is transmitted on a per area basis to the local controllers. Their information is condensed and transmitted upward to the central microcomputer. Transfer of status is always unidirectional and upwards. Transfer of commands is always unidirectional and d

14、ownwards, with expansion at the local control level. This approach preserves the strict rules of the hierarchy for exact monitoring detection and alarm systems associated with high risk plants.The classification of the two layers of controls is based upon layers of decision making, with respect to t

15、he facts that(a) When the decision time comes, the making and implementation of a decision cannot be postponed(b) The decisions have uncertainty(c) It will isolate local decisions (e.g. locally we might have an alarm although there may be a fault with the system)2 General hardwareI :Fig. 2 depicts o

16、ur design in the simplest of forms. The system uses an open party line approach with four conductor cables going in a loop shared by all the remote devices and the control panel. This approach is simple in concept and is economically feasible. However, one major disadvantage is the dependency on a s

17、ingle cable for power and signaling. In cases where reliability is of extreme importance, two or even three cables taking differentroutes throughout the system may be connected in parallel. Fig. 3 gives the driver circuitry required to derive an expandable bus. This design takes advantage of recent

18、advances in the single chip microcomputer technology to reduce the interface between the central station and the local stations.2. 1 Central control taskA central unit provides a centralized point to monitor and control the system activities. In the system to be described the central control unit se

19、rves a fivefold purpose.(i) It receives information from the local stations and operates the alarms and other output devices.(ii) It notifies the operator in case of system malfunction.(iii) It provides an overall system control manual and automatic.(iu) It provides a system test point of local stat

20、ions and itself.(u) It provides a central point for observation, learning and adaptation.2.2 Local stationsThe local stations can take local decisions regarding recognition of a risk situation, and act independently on local affairs. In this technique we depend on load-type coordination, e.g. the lo

21、wer level units recognize the existence of other decision units on the same level; the central or the top level provides the lower units with a model of the relationship between its action and the response of the system.It is evident that a powerful machine is required at this stage so that all the

22、required functions can be implemented. The availability of the new generation of microchips makes this architecture a feasible solution.A single chip microcomputer was chosen over discrete digital and analogue devices to interface to the field devices and to the central microcomputer. This is the ma

23、in reason that previously this approach was not feasible.In selecting the microcomputer for the local stations, the criterion was the requirement for a chip which contains the most integration of the analogue and digital ports required for the interface and the utilization of CMOS technology owing t

24、o remoteness of the local stations. The choice was the Motorola 68HC11A4, for the following reasons:(a) It is CMOS technology; this reduces power consumption.(b) It has a UART on board; this facilitates serial communication.(e) It has an a/d converter on board; this eliminates an external A/D.(d) It

25、 has 4K of ROM, 256 bytes of RAM, 512 bytes of EERROM with 40 1/0 lines and a 16 bit timer; this satisfied all our memory and 1/0 requirements at the local station side.3 System implementationThe local station: Fig. 3 is the block diagram of the circuit used to utilize the MC68HCllA4 as a remote fir

26、e detecting circuit while Fig. 4 illustrates the same circuit in an expanded form. It can be seen that the single microcontroller can be used to monitor more than one detector, thus reducing system cost.The loop power supply, which is usually between 28 and 26 V, is further regulated by a 5 V 100 mA

27、 monolithic low power voltage regulator to supply power to the microcontroller. The onboard oscillator, coupled with an external crystal of 2.4576 MHz, supplies the microcontroller with its timing signal which is divided internally by four to yield a processor frequency of 614.4 kHz, which is an eve

28、n multiple of the RS 232 7 baud rate generator. In this Section the term supervised input or output will be used to mean that the function in question is monitored for open- and short-circuit conditions in addition to its other normal functions. More information can be found in Reference 9.4 Main lo

29、op5 ConclusionThis paper describes the development of a large scale fire detection and alarm system using multi-single chip microcomputers. The architecture used is a two-level hierarchy of decision making. This architecture is made possible by the new CMOS microcontrollers which represent a high pa

30、cking density at a low power consumption yet are powerful in data processing and thus in decision making. Each local station could make an autonomous decision if the higher level of hierarchy allows it to do so. It has been tried to keep the system design in general format so it can be adapted to va

31、rying situations. A prototype of the described system has been built and tested 10. The control part of the central station is implemented with a development card based on MC 68000 microprocessor (MEX 68KECB, by Motorola), which has a built-in monitor called Tutor. The application programs were deve

32、loped using the features provided by this monitor. The local stations controllers were designed using the MC 68705R3, single-chip microcontroller.7 References1 Fire protection guidelines for nuclear power plants, US NRC Regulatory Guide 1.1202 BAGCHI, C.N.: A multi-level distributed microprocessor s

33、ystem for a nuclear power plant fire protection system controls, monitoring, and communication, IEEE Trans., 19823 PUCILL, P.M.: Fire hazard protection, detection and monitoring systems, Sea. Con, 2, Proceedings of Symposium on ADV in offshore and terminal measurement and control systems, Brighton,

34、England, March 1979, pp. 353-3634 HEAVISID, L.: Offshore fire and explosion detection and fixed fire. Offshore Technological Conference, 12th Annual Proceedings, Houston, Texas, May 1980, pp. 509-5225 CELLENTANI, E.N., and HUMPHREY, W.Y.: Coordinated detection/communication approach to fire protecti

35、on, Specify: Eng.,6 Motorola Microprocessors Data Manual (Motorola Semiconductor Products, Austin, Texas, USA)7 Electronic Industries Association : Interface between data terminal equipment and data communication equipment employing serial binary data interchange (EIA Standard RS-232, Washington, DC

36、, 1969)8 MESAROVIC, M.D., MACKO, D., TAKAHARA, Y.: Theory of hierarchical multilevel systems (Academic Press, 1970)9 KASSEM, M.: Fire alarm systems, MSc. thesis, Dept. of Elec. & Comp. Eng., Concordia University, Montreal, Canada, 198510 LIE, P., and KOTAMARTI, U.: The design of a fire alarm system

37、using microprocessors, C481 Project, Dept. of Elec. and Comp. Eng., Concordia University, Montreal, Canada, 1986译文基于单片机的火灾探测和监控系统A.J. AI-Khalili, MSc, PhDD. AI-Khalili, MSc, PhDM.S. Khassem, MSc关键词：危险，设计，设备状态监测摘要：火灾探测及报警监控已成为一个复杂而完整的体系。该系统采用多个单芯片架构到一条主线上。该控制算法是基于两级决策层次，因此分配了复杂性。一个完整的电路原理图，给出了主、分控制器所

38、需的软件的结构要求。设计延续一般形式，这样可以适应于多种系统的配置。尤其显示出新的技术发展，特别是CMOS单芯片器件，在系统设计中的使用，以减少整体硬件的复杂性，例如，通过分解系统，这样的层次较低水平的控制器能够有一些决策自主权，用简单的分布式的方法解决了复杂的决策。1、检测和报警装置一个基本的火灾探测系统由两部分组成，检测和报警。自动检测设备有比如热，烟雾或火焰检测器，紫外线或红外线探测器或火焰闪烁，是基于检测 一个燃烧的副产品。烟雾探测器都电离和光类型，是最常用的检测设备。 当这种类型的典型探测器进入报警状态产生的电流信号会从PA变成MA （比如，从单纯的15pA在休眠模式下为60毫安）在

39、主动模式。在许多探测器的检测器输出电压明确在各种运行条件，例如见表1。 越是敏感的检测器， 它更容易受到虚假警报。为了控制探测器的精确，可使用下列方法：过滤技术，这样的逻辑电路成为活跃仅当x警报的时间内检测周期T。检测技术在很大程度上取决于地点和植物受到保护，烟雾探测器是睡觉的地方，红外线和紫外线辐射探测器，检测易燃液体燃烧，热探测器用于灭火和灭火系统。一般来说，生命和财产保护有不同的做法。报警装置，从通常的声响或视觉报警外，还可以采用固态的声音再现和紧急话音通信或打印机，记录时间，日期，地点和其他资料 。1.1控制理念和分工 我们的理念是实施控制等级。 三个层次的系统级的实施， 两个级别的决

40、策。之间没有设备 ， 在同一层次的沟通。 交互各级之间发生了向上的信息传输有关的子系统和向下状态转移的命令。这是图所示。1，其中第1级是中央控制站，是微机最终（在不手动模式）决策者。第2级是当地控制器，建立在当地的站。 第3级是实际检测器和驱动器。在各级提供手操作模式。所有探测器的数据和分处理器是当地控制的基础。他们将信息浓缩，并转交中央处理器。信息传递的地位始终是单向及以上。命令传输是单向的总是向下，并在扩大局部控制的水平。这种方法保留了层次的准确监测检测和严格的规则高风险的核电站警报系统。两个控制层的分类是基于决策层。（一） 在届时的决定，提出和决定的执行情况不能再拖延 （二）决定的不确定

41、性 （三）将隔离当地的决定（例如，我们可能会在当地报警，但有可能有故障系统）2、硬件 图.2描绘了我们的设计最简单的形式。这个系统采用四个导体开放的路线，在所有远程共享一个循环电缆设备和控制面板。这种方法简单，经济上可行。但是，一个主要缺点是对一个单一的电力和信号电缆的依赖。在重要环境下，可靠性是极其重要的。固可采用两个甚至三个电缆采取不同的线路连接，可并行连接。 图.3是驱动电路必须得一个扩展总线。采用这种设计在单片机技术的最新发展优势减少与中央控制站和地方控制站的接口。2.1中央控制任务 中央站点提供了一个集中点，以监测和控制系统的活动。在该系统介绍了中央控制单元的目的 （一） 它得到了分

42、控制站的信息和控制警钟及其他输出设备。 （二） 它提示在系统出现故障时的操作。 （三） 它提供了一个全面系统的手动和自动控制。 （四）， 它提供了中央和分站的系统测试点。 （五） 它提供了一个中心点观察，学习和适应。2.2 分控制站分控制站的决定可以控制处理当地的信息。这种技术我们就依靠负载型协调下级单位，承认在同一水平上的其他决定单位的存在;中央或高层提供了一个较低的单位模型之间的行动和系统响应的关系。很明显，一个强大的机器，需要在这个阶段，使所有需要的功能得到有效执行。 该芯片的新一代供应使得该体系结构的解决变得可行。 单片机被选中了离散的数字和模拟设备接口，到外地设备和中央微机。这是最主

43、要的原因，以前这种做法是不可行的。该芯片的选择的，包含要求的模拟和数字接口所需的端口和CMOS技术的运用 ， 由于地处偏僻的分控制站最一体化。 这个选择是摩托罗拉68HC11A4，理由如下： （1）它是CMOS技术，这可减少电力消耗。 （2）它有一个UART，这有利于串行通信。 （3）它有一个A / D转换器上，这消除了外部A / D转换 （4）它有一个4K的ROM，256 K内存，512K EERROM字节40个I/O端口的线路和一个16位定时器;符合分控制站所有的内存和1 / 0的要求。3、系统实施 分控制站：图.3 是用于一个远程火灾报警MC68HCllA4电路框图 检测电路：图.4这是

44、前一个电路的扩展形式。可以看出单片机可用于监控多个探测器，从而降低了系统成本。 回路电源，通常在26到28V之间，通常五伏一百毫安单片低功耗电压调节器供电的微控制器。板载振荡器，是一个2.4576 MHz的外部晶体结合，提供时间信号，它被分为4个内部收益率为614.4千赫，这是一个更多的RS 232 7波特率发生器的处理器频率微控制器。 4、主循环5、结论 本文描述了一个大规模的火灾探测及报警系统，使用多的发展，单芯片微型计算机。该架构是采用两个层次的决策层次。这种架构是可以用到的新的CMOS微控制器，低功耗，并在数据处理功能强大的高堆积密度和决策。每个地方控制站可以自主作出的决定如果上级机构

45、，允许它这样做。一般格式化系统设计，因此它可以适应不同的情况。所描述的系统原型已经建成并测试10。 中央控制站的控制部分是基于MC 68000微处理器（墨西哥68KECB摩托罗拉），它有一个内置的显示器称为导师。 该应用程序都是使用这个显示器提供的特性。 本地基站控制器的设计采用了MC68705R3单片机。7、参考文献1 Fire protection guidelines for nuclear power plants, US NRC Regulatory Guide 1.1202 BAGCHI, C.N.: A multi-level distributed microprocessor

46、 system for a nuclear power plant fire protection system controls, monitoring,and communication, IEEE Trans., 19823 PUCILL, P.M.: Fire hazard protection, detection and monitoring systems, Sea. Con, 2, Proceedings of Symposium on ADV in offshore and terminal measurement and control systems, Brighton,

47、 England, March 1979, pp. 353-3634 HEAVISID, L.: Offshore fire and explosion detection and fixed fire. Offshore Technological Conference, 12th Annual Proceedings,4, Houston, Texas, May 1980, pp. 509-5225 CELLENTANI, E.N., and HUMPHREY, W.Y.: Coordinated detection/communication approach to fire prote

48、ction, Specif: Eng.,6 Motorola Microprocessors Data Manual (Motorola Semiconductor Products, Austin, Texas, USA)7 Electronic Industries Association : Interface between data terminal equipment and data communication equipment employing serialbinary data interchange (EIA Standard RS-232, Washington, DC, 1969)8 MESAROVIC, M.D., MACKO, D., TAKAHARA, Y.: Theory of hierarchical multilevel systems (Academic Press, 1970)9 KASSEM, M.: Fire alarm systems, MSc. thesis, Dept. of Elec. & Comp. Eng., Concordia University, Montreal, Canada