Research And Design Of Full-Vehicle Dynamic Weighing Instrument Based On μCOS-Ⅲ

The reason why traffic congestion often occurs in the toll station, witchone using the axle load meter, is that the accuracy of weighing equipment isnot enough, the vehicle type recognition rate is low, and easy to damage. Thereason why transfinite station for the overloading detection, usually has adynamic axle load meter, and at the same time also need to be equipped withstatic truck scale for the re-inspection on vehicles, is that the axle loadweighing accuracy is not enough. And that usually caused transfinite stationcovers an area of large, low utilization rate of equipment, construction cost ishigh. So urgently need new type of dynamic weighing equipment.At present, the dynamic weighing technology with weighing advantages oftraffic speed, can detect vehicles has become a development direction ofweighing technology and widely used. Dynamic weighing technology usuallyadopts the axle load meter, but due to its single axle weighing precision isinfluenced by many factors, single axle weighing precision is low, and thesingle axle weighing error accumulation cause vehicle weighing precision isdifficult to guarantee. In view of the axle load meter dynamic weighingaccuracy problem, and highway project charge system and overrun detection need to detect vehicles single axle weight, identify axis type, appeareddifferent weighing platform structure of vehicle dynamic weighing programs.First, add single mesa, in the front of the truck scale static axle load meter,used to detect single shaft weight and axle, to ensure the weighing precision ofthe vehicle, but did not improve for single axle weighing precision. Second,will be joining together of multiple axle load meter mesa, this will result indoubling the number of sensors, need more acquisition channel, higherrequirements for instrument hardware performance, equipment cost is higher,because at the same time of mesa mounting problems, weighing platformdisplacement seriously affect the weighing effect and the single axle weighingaccuracy is similar to axle load meter weighing precision.In view of dynamic axle load meter is difficult to ensure the weighingprecision of vehicle weight because the weight of single axle weighingaccuracy is not high, and existing vehicle dynamic weighing system of singleshaft weight weighing accuracy is not high, models recognition rate is low,this paper designed vehicle dynamic weighing instrument based on theembedded real-time operating system μCOS-III, adopt expert algorithm on thesegmentation of the vehicle weighing data, to isolate single axle weight, toidentify vehicle type shaft, improve vehicle and single axle weight weighingprecision and improve vehicle shaft type recognition rate.This paper studies the motion model of the vehicle driving to the weighingplatform. The movement law of weighing platform under the action of vehicle. ADC quantization noise in the data acquisition and the method of reduce thenoise and improve the accuracy of sampling. This paper studies the feasibilityof parallel sensor to reduce sampling channel, and the premise of the sensor inparallel. Design the hardware circuit of the vehicle dynamic weighinginstrument. Combined with OS features of the control core MCU, this paperstudied the implementation principle and migration process of the embeddedreal-time operating system μCOS-III. Use this system simplify the programstructure of instrument design, designed the peripheral equipment driver,designed the instrument interface based on the FSMC interface and usergraphical interface STemWin, improved user interaction. According to vehiclemotion model and data waveform features designed expert algorithm for thevehicle type dynamic weighing. This paper lists the knowledge base of expertalgorithm, describes the reasoning process of implementation. And instrumentis applied in the experimental environment, and import the actual measureddata verified expert algorithm and the instrument function. This paper haspresents the test results, and summarized the deficiency of the instrument,prospected the future work.