Realization Technology of Highway Vehicle Overlimit Supervisory System

In order to resolve the question of highway overlimit the gate-ban supervisory system of overlimit vehicle has been researched. This system used the combined method of integration and research. It integrates the dynamic wheighing system and license plate recognition system separately, and researches a set of truck overlimit supervisory system which uses two LMS221 outside laser distance measure sensors of German SICK Corporation, and the two sensors are pegged on the gate steel frame. In order to get the precise data of vehicle outline, the two laser sensors are demarcated in locale, and get the ground outline curve when no vehicle passes. When the vehicle passes through the gate steel frame, the most width and height of vehicle loading are calculated according to the actual measured distance. This realized the non-contact distance measure through the laser scan, then draw two-dimensional image according to the distance. This system uses Microsoft Visual C++6.0 programmed language and the hardware uses yanhua computer, which complete the software program design through programming hardware interface subsystem, data processing subsystem and Human-Machine interface subsystem. The system completed the function that dynamic measurevehicle weight which pass the gate-ban and monitor the loading geometry parameters and distinguish real time and storage truck license plate, and judge the vehicle overlimit whether or not, then show the vehicle outline curve and other information to the manipulator real time, which provides the reference to judge the vehicle overlimit. The system has been applied on Wapenyao entry of TongSan highway three years, the results indicate the system have got excellent overlimit management effects, the overlimit vehicles pass in the entry present decreasing trend year by year.