Method and system for on-line automatically beforehand judgment of overloading wagon

The invention discloses an overloaded truck online automatic pre-judgment method and a system thereof, which overcomes the problems of difficult classification of motor vehicle types and slow weighing speed, etc. The method includes two steps, that is, a vehicle type recognition step and a overloading pre-judgment step, and the overloading pre-judgment step includes the following processes: 1) a vibration sensor is utilized for collecting the vibration signal of a running vehicle; 2) an endpoint detection method is utilized for judging whether a running vehicle is running on the road or not, if no running vehicle, the signal does not enter the next step; 3) whether the running vehicle is a goods carrying vehicle or not is judged by the collected sound signal of the running vehicle, if not, the signal does not enter the next step; 4) when the running vehicle is judged to be the goods carrying vehicle by the vehicle recognition step, and signal preprocessing is carried out on the vibration signal of the goods carrying vehicle, that is, signal de-noising, frame interception and normalization; 5) a wavelet packet parameter calculation is carried out on the vibration signal after the signal preprocessing; and 6) BP network overloading is pre-judged. The system implementing the method consists of a signal input module, a signal processing module, and a microcomputer interface module, which are sequentially connected by electric wires.