基于三维成像技术的四轮定位参数建模方法

Four-wheel Alignment Parameters Modeling Method Based on 3D Imaging Technology

摘要:

鉴于现有四轮定位仪参数求取方法误差大、参数项目少、对测量环境要求高等不足,提出了一种基于三维成像技术的四轮定位参数建模方法；该方法通过双摄像机对目标板拍摄获得的图像信息,应用空间向量方法,求取车体运动状态下的轮轴信息,动态建立四轮定位参数测量模型,解决测量平面的动态建立、测量平台的补偿等问题；经过零标定平台测试,当车轮旋转在18~22°时,定位参数求取方法正确有效,通过实车对比测量验证,平均误差小于0.07°。

Abstract:

To solve the problems of gross errors, few items and high demand on surroundings in calculating parameters for a four-wheel aligner, a modeling method for the aligner based on the 3D imaging technology is proposed in this paper. In this method, a model for calculating the aligner parameters is created dynamically with the image data obtained from two cameras and the axle data calculated with the spatial vector method, in order to dynamically establish the measurement plane and compensate the measurement platform. The zero calibration platform testing shows that the method of calculating the aligning parameters is correct and effective when the wheels rotate between 18-22 degrees. The average is below 0.07 degree in the real vehicle comparative measurement verification.