Research On The Technology Of Monitor And Traffic Signal Control For AGV Logistics System

Since the first AGV is successfully excogitated by AmericanBasrrett Electric Corp. in 1950s,AGVs are applied widely and a greatdeal AGV logistics systems are established in the domestic and oversea.JLUIV Research Group make great progress in the field of AGV navigationtechnology & control technology since the first AGV based on visionnavigation is excogitated in 1999. At present JLUIV Research Group isstudying the way to apply AGV based on vision navigation in enterpriseproduction logistics, so it is very exigent to establish an integratedautomatization logistics system. The paper makes some probe intomonitor & control and traffic signal control for AGV logistics system. The major works in the paper are following:1. Electronic Map Technology a. Introduce the keystone and facture of electronic map. b. Design electronic database for AGV logistics system based onthe fact of AGV based on vision navigation. c. Define fully data structure of database and obligate data extendinterface, d. build the relation topology for nodes, joint nodes and roadsin database. e. Program to operate electronic map database in VC++ by ADOtechnology and design a simple and easy-use database operationsoftware so that users can add, delete and modify easily the data inthe electronic map database. f. Monitor & control system can read data from electronic mapdatabase and generate electronic map to provide software environment ―3―Abstractfor AGV monitor, vehicle positioning & map match and traffic signalcontrol etc.2．AGV Positioning & Map Match Arithmetic a. The paper applies dead reckoning arithmetic in monitor for AGVlogistics system for AGV logistics system's lack good positioningmethod. b. To eliminate accumulative error of dead reckoning arithmeticthe paper applies special identifier correct and map match arithmetic. c. The paper introduces map match arithmetic based on cost functionin AGV logistics system in addition to introduce the basic method ofmap match.3. Wireless Communication Technology a. Introduce some key wireless equipment and build InfrastructureNetwork. b. Make TCP/IP communication model making use of multi-thread andsharing data-structure technology. c. Introduce mini honeycomb overcast precept based on multi accesspoints for future wireless network's extend. d. Assure the safety of wireless communication by restrictingaccess of ESSID or MAC and data encrypting.4. Traffic Signal Control Arithmetic a. Research traffic flow characteristic of road cross and probeinto the calculation of headway, distributing of headway, criticaltraversing clearance and following headway. b. Introduce timing control arithmetic and calculate signal cyclelength and green ratio. c. Introduce full induction control arithmetic and calculatemostly road minimal green light time, subordination road originalgreen light time, unit continuing green light time and maximum greenlight time. d. Program simulation software of traffic signal control of roadcross. e. Research the effects of the change of signal cycle length and ―4―吉林大学硕士学位论文green ratio to overall times of stop. f. Compare the times of stop by timing control with the times ofstop by full induction control and draw a conclusion that the timesof stop by full induction control is less 10 percent than the timesof stop by timing control. The paper solve efficiency the issues so as electronic map'sdesign & creating, AGV's positioning and map match, wirelesscommunication and traffic signal control etc by the research of monitor& control and traffic signal control for AGV logistics system. It isreferential for the subsequent research of AGV logistics system.