Kavşak kontrol cihazlarında arıza dedeksiyonu
Başlık çevirisi mevcut değil.
- Tez No: 355103
- Danışmanlar: YRD. DOÇ. DR. ÖZGÜL VAYVAY
- Tez Türü: Yüksek Lisans
- Konular: Teknik Eğitim, Trafik, Technical Education, Traffic
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 1997
- Dil: Türkçe
- Üniversite: Marmara Üniversitesi
- Enstitü: Fen Bilimleri Enstitüsü
- Ana Bilim Dalı: Elektronik-Bilgisayar Eğitimi Ana Bilim Dalı
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 139
Özet
Özet yok.
Özet (Çeviri)
In this study, a remote control of road intersection signalling is designed and perfOlmed basically. Controlling of the intersections, getting infonnations about the problems of traffic ligths delivering data at minimum delay of time is getting more important each day due to the increasing density of the transport. Although there are examples of controlling the intersections in the world, the aim of the study is gaining experience, knowledge and perfonning basic structures for the later works. The major problem of the remote control is the transaction between the units with full reliability. If the transmmission link is cut off, the transaction must be recovered as soon as the physical link is connected. The system must be configured by the message type which carriers the enough infonnations about the alarms and events. Also operation centre must have a reliable, userfriendly SW . The transmission link will be longer than lOOmeters, so more effective structures must be used in transaction inspite of RS485 and RS232C. By these restrictions and purposes, the remote control structure is designed and perfonned. The system is a combination of two parts. First part is the Message Transfer Unit which controls the link and CaInes out the communication between the traffic signalling system and the Traffic Control Centre. The duty of the Message Transfer Unit is to upload alarms and events from the signalling system and in the reverse direction, download the data from the control centre to the signalling system. Message Transfer Unit is configured as 80C51-microcontroller based system with K-Series 73K224 Modem chip and analogue part to handle the hybrid circuit and telephone line interface properties. Modem chip is set to 1200bps / DPSK modem for leased line operation. There are also some futuristic properties as switch option for operation modes that can be implemented within SW. Four modes of operation can be selected by setting double dip switch as leased line, dila-up, test-mode, local mode operations. It can recover the communication after the link cut off s at the remote end. Second part Trafic Control Centre is developed by using Visual Basic ver 3.0. An internal Hayes compatible modem is used to communicate. SW program which is running on the Control Centre, is simple, reliable and userfriendly. One of the windows that exists during the operation, is 'CONSOLE' window. It displays all the infonnation on the communication link without any decoding or filtering. 'ALARM & EVENT' window also exists during the sessions and gives the alanns and events status of the intersection with coded format including the date stampt. There is also a SQL database application used for checking and monitoring the previous alanns. This window is called 'Alann Handling' that alarm and event results can be obtained with statistical swnmaries. One window is left and used for transmitting timing parameters to the remote end. The basic structure of the Control Centre, PC used in the study is 386DX-40 /J.P, 4Mb RAM, 14400 bps Hayes compatible Prolink internal modem (comm port-31 IRQ 5), Windows applications.SW program supports up to 24-light groups' configuration. F or testing the system properties, an intersection signalling system simulator is being used which has the similar parts to the /J.C of the signalling system. This unit contains a standard 4x3 keyboard which simulates the the alanns being occured within the intersection signalling system and 4 leds represents a traffic light group. Simulator uploads the related data to the Message Transfer Unit via serial port RS232 interface. During the performance tests two actions were taken into account: 1. Collecting the alarms and events of the remote end, 2.Drive the leds due to the settings which are configured by the centre. Also the line cut off was simulated and the procedures were tested on the both sides. Control Centre detects the commport-3 every 50 mili seconds during the sessions. At the remote end, Message Transfer Unit tests its serial port, interrupts from the intersection and makes carrier detection. The intersection control unit has to make the detection of the alarms and events, upload the system failures, receive the data from the Control Centre. Message Transfer Unit sends a message structure of 8 sequential ascii codes to inform the Control Centre about the alarms. Below the message type structure can be examined, Pl:(X) P2 :(0-8) P3: (O-F) P6: (P) P7: (0) P8 :(x) Two flags are used for indicating the header and tail forms, information fields consists of three parts such as describing the group number (GROUP NO) of the light group at the intersection, RediAmber/GreenIFlasher are the types of the lights, third part is the alrum type indication as InTraffic/Outof TrafficlTRiac fault/Green-green LocK. Message type shows the adress of the data is related to. The sixth field is Control field which is kept for the futuristic enhancements. As described above, the message type has a flexible structure. Also a simple handshake routine is designed between the intersection control system and the Message Transfer Unit based on RS-232C standards. A better perfonnance can be achieved at the Control Centre PC by making some HW additions (ex. RAM addition) and upgrades (ex. a higher configured J.LP board). As a conclusion, a basic remote control of intersection signalization is being examined, designed and perfOlmed. It can be a useful source for later studies on this topic. The system is designed for a single intersection control but also two ways of controlling for iwo or mure intersections can be advised; 1. Using one modem for each of the intersections. 2. Using dial-up lines for every intersections. Each solution needs S\V upgrades in the present configurations of the both Message Transfer Unit and Control Centre programs. By this thesis, giving all experience and knowledge that I gained, I wish this will be a basement on remote control of the intersection signalling.
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