Design Of Vehicle Weigh-in-Motion Instrument

As in recent years the continuous development of our highway, The collection of road tolls need to be more rational and transparent billing. In addition, the highway management department has the urgent need for effective tools and equipments to manage overloading vehicles, Therefore, the weight of the vehicle to charge and governance become the main basis, to set up less revenue, more revenue and more overload set penalties for management purposes.On the current domestic highway vehicles weighing means as two: vehicle static weighing and dynamic weighing of vehicles. The way of vehicle static weighing of vehicles is that road Administration personnel to a suspected overweight vehicles weighing station weighing specialist. The role of vehicle tire load weighing device in a static force on the vehicle just down the gravity and the static equivalent, and Vehicles, vehicle weight can be measured by detecting device and displayed on the instument. While the vehicle static weighing system performance satisfaction, technology simple and accurate measurement, some problems are that the large scale platform, severe road damage, measuring the efficiency of low consumption and factors such as staff, It is easily lead to implementation difficulties and the impact of poor transport, and difficult to play the advantages and improve highway efficiency. The way of dynamic weighing of vehicles is that Vehicle movement is called a state of dynamic scale by smaller units to weight of no parking. It is to overcome the static vehicle weighing the adverse effects. It can easily realize the axle load gauge, weight and weight control overloading of charges. Currently, Vehicle highway dynamic weighing is already carried out the primary means of measuring weight and direction. However, the weighing system is in dynamic change, the factors that affect the accuracy of dynamic weighing, for example, vehicle speed, the width of scales, vehicle accelerations, vehicle vibration and road roughness, etc. These factors are bound to reduce the measurement accuracy, measurement errors caused by large and not accurate, resulting in weight Overload detection and charges do not have a strong persuasive and broad public credibility. Therefore, in existing vehicles dynamic weighing system based on dynamic weighing of vehicles to improve the accuracy of the research and development of appropriate instrumentation, has important theoretical and practical significance.Therefore, this article first introduces the highway leading to the adverse effects of severe overload, indicating the use of vehicles dynamic weighing system, the importance and urgency, and to discuss the current status of vehicle dynamic weighing technology, pointed out that the accuracy of weighing and dynamic weighing instrument design development of object-oriented study of the subject; then, details of vehicle dynamic weighing system and its principle, and work vehicles dynamic weighing system for a detailed description of the process, the same time, to vehicle dynamic weighing system The core components (resistance strain gauge load cell) as the analysis object, describes its installation, operation principle and measuring circuit; dynamic weighing system for vehicle body to be called vehicles, analysis of motion characteristics of the vehicle, the dynamic that weight system vibration analysis and dynamic characteristics of the load cell, and a mathematical model and derive its transfer function; then, the characteristics of dynamic weighing instruments, details of the composition of its hardware and peripheral circuit design, and hardware and software for signal acquisition circuit for anti-jamming design, gives the signal acquisition circuit performance test methods and results; Finally, in the instrument hardware circuit based on the combined work of dynamic weighing of vehicles over cars, the software module for the operating system Under the mandate, and details onμC/OS-Ⅱembedded real-time operating system, dynamic weighing instrument software design methods and processes.