| At present, China generally use weight fees system based on dynamic weighing to governance overloading in road, while the traditional methods usually establish large-scale weighing inspection station on Highway mainline track. The methods have some disadvantages: the relative concentration of the detected vehicle, low detection efficiency, easily cause traffic congestion, the vehicle evade inspection through bypass.To solve these problems, designed a truck-mounted dynamic weighing system after making full survey of existing vehicle weighing equipment and considering the actual needs. The system can real-time monitor the load trucks weighting data and locate the vehicle position in real time through the GPS device. It also send the information of load capacity, vehicle location, speed and others to the monitoring center using GPRS network, while the vehicle terminal can receive various monitoring center command.The main contents are shown as follows:Firstly, introduced the research background, significance, research status and future direction of development in the field of vehicle dynamic weighing.Secondly, the overall scheme of the system is designed by analyzing theachieving objectives requirements of the dynamic vehicle weighing and the vehicles weighing accuracy factors, the principle and structure of the system are introduced, and then the selection and principle of sensors are discussed in detail.Thirdly, the board weighing system hardware design is discussed in detail.The system core is STM32F107VCT6 embedded ARM processor, it achieve wireless data transmission and vehicle GPS positioning function using GPRS /GPS DTU, DGUS screen as the vehicle terminal unit in human-computer interaction module and U disk as a local data storage media. Hardware section includes power modules, data acquisition and processing module,human-computer interaction module, wireless data transmission module, data storage module and so on.Fourth, software design of vehicle dynamic weighing system is discussed in detail, which adopt a modular design cogitation, this part mainly including data acquisition system software design, data remote interactive design,development and design of graphical interface, local data storage system to achieve, monitor center test software design and development.Fifth, discussed in detail the data processing algorithm of on-board weighing systems. First, the improved filtering algorithm for vehicle weighing signal filtering and signal dip pretreatment are used, and then the dynamic weighing preprocessed signal, the inclination angle signal and the vehicle speed,acceleration collectively as radial basis(RBF) neural network input, then, themore accurate vehicle weight data are got after training the neural network.Finally, the feasibility of the algorithm is verified through six-axle vehicle dynamic weighing system experiment.Sixth, combining the system design with actual field test results, the experience of the system design and shortcomings are summed up, and the improved method is proposed.The main innovation of the paper are:First, the system achieves real-time monitoring of freight vehicle loading,running and others using sensor technology, satellite positioning technology and network technology.Second, a generalized RBF neural network model is established based on the in-vehicle dynamic weighing field data, secondary treated the dynamic weighing signal after preprocessing filter combined with the vehicle inclination angle, speed and acceleration, made it close to the value when the truck is stationary and level. |
