双目视觉下建立动态四轮定位测量平面的方法

Approach to Establishing Dynamic Four-wheel Alignment Measurement Plane With Binocular Vision

针对现有车辆四轮定位设备受测量环境影响大等弊端,利用双目立体视觉测量技术,提出了一种车辆四轮定位测量平面的动态建模方法.通过推动车辆,获取多组车辆运动过程中的车轮靶标图像信息,运用空间向量方法,建立动态测量平面,计算车轮旋转轴,求取四轮定位参数,解决因测量现场不水平和测量环境干扰造成的误差偏大等问题,并简化了测量步骤.经过测试,四轮定位参数不受举升设备和场地影响,测量误差在±0.05°范围内.

Modeling method for vehicle's four-wheel alignment measurement plane is proposed in this paper,with the purpose of overcoming the difficulty of the present measurement for vehicle's four-wheel alignment that was severely affected by the measuring environment. First,by moving vehicles,different image information of the wheel target was obtained during the moving of the vehicle. Second,with the spatial vector method,the measurement plane was dynamically created,and the wheel's axle data were calculated,as a result this method get the four-wheel alignment parameters and solves the problem that the error is too big when measuring level is not even or measurement environment interfere with the result. Moreover,with the new method,the measurement procedure is simplified. Test shows that the four-wheel alignment parameters are not affected by the lifting equipment and site,and the margin of error is between- 0. 05° and 0. 05°.