Expressway monitoring system linkage control scheme (1)

Expressway monitoring system for highway information system is a major component, are gradually lead to the concerns of industry peers, we understand that many units in the mechanical construction of the three systems, often in only attach importance to the construction of hardware devices, software programmes, particularly on monitoring system of how to meet the actual operational needs, take energy, the contractor is also attention is not enough, the completion of the monitoring system, the outfield and tunnel monitoring equipment spend enormous, but as the core monitoring software to prepare simple, causing the expense to building monitoring system is not fully play its role, the related governance sector cannot monitor system achieve its command and control center features.

In fact, the monitoring system of construction is the realization of intelligent traffic, an important basic work, must earnestly. Now I would like some tips on doing a summary. Communicate with colleagues. Data acquisition in all control systems availability must need a basis, that is the exact data acquisition. Accurate data acquisition from three aspects, 1, sensor devices merits; 2, the stability of the data transmission system; 3, core acquisition data systems. Expressways monitoring system, the data acquisition equipment mainly for: traffic flow testing equipment, meteorological equipment, tunnel environment Analyzer. It is currently used by the freeway data acquisition equipment, basic stand-alone device meets the requirements, with stable performance; a transmission line using optical fiber communication system, its performance is stable, at present the majority of data acquisition is not accurate, the main and upper core data acquisition software for rough and software programming for the scene understanding stand-alone device, the top of the core data acquisition software design simple, not played the role of the integrated analysis. Therefore, in a real project, you should pay attention to the following: vehicle detector detector in field monitoring equipment, the largest number in the maximum errors, mainly because of technical vehicle inspection requirements are not standardized, along with their respective construction units understand the development of related software, transfer data volume is too big, and so on, to do this, on top of the device's features and software to make the following requests: vehicle detector should have hourly average speed, maximum and minimum speed, traffic flow, the share of computing, storage and output functions, all data should not be because the device power down and reset and lost. Usually the position machine acquisition real-time data as the data display and tunnel traffic jam, jam judgment, hourly traffic statistics on traffic flow and to minimize the amount of data communications, traffic outages cases vehicle detector only hourly average speed, maximum and minimum speed, traffic flow, share data, in order to ensure the traffic flow of accurate historical data. Vehicle share of time cycle unified calculation by 5 minutes.

When the vehicle detector fails all vehicle inspection for average speed, maximum and minimum speed, traffic flow, market share for the same period of last 10 days before the weighted average as approximate upload monitoring center to ensure that basic traffic flow calculation.

Tunnel under vehicle inspection for share {generally somewhat dry 60 per cent) or three times the speed of vehicles through and are lower than 20Km/H determination whether traffic, resulting in a police signals, at the same time, the camera switches to police zone by the watchman to determine whether traffic congestion. Weather checker, environment detector uses the weighted average of the judgment, the environment over whether police officers, threshold should be fixed by the monitoring personnel manual to meet actual operational needs. For road traffic control, real-time performance requirements, in order to ensure the accuracy of the linked control related Board of linkage may be issued after artificial confirmation. Variable conditions of data transmission and control of the situation of the maximum amount of data transferred, require that all conditions of data transmission through fibre-optic Ethernet transceiver for transmission, for not using Ethernet transport of plates, you can achieve data transfer: variable should have clear plate, to regularly post function detect feeling Board appear pixel point failure, fault coordinate point method failure points back to the host computer to reduce the amount of data transferred. [1] [2] [3] [4] [5]