Vehicle Mass Identification Based on Two-axle and Two-mass Vibration Model

Abstract

Abstract The mass of the vehicle is an important parameter, through which many other performance indicators of the vehicle can be measured. The traditional method of vehicle mass identification is mainly through fixed platform detection station and weighing in motion. In this paper, a two-axle and two-mass vibration model is established to identify the vehicle mass, which takes the free vibration frequency of suspension as input and outputs the vehicle mass. Firstly, when the vehicle passes a specific excitation, the two-mass model composed of suspension and wheels generates free vibration, and then its main frequency is obtained. And then the mathematic relation between the vehicle mass and the main frequency is established through the two-axle vibration model, and the vehicle mass is obtained. Simulation in TruckSim shows that the average relative error between the identified mass and the actual mass is 6.27%. In practical application, the free vibration frequency of the suspension can be obtained by image recognition or displacement sensor, so as to identify the vehicle mass.