In order to improve the accuracy, stability and flexibility of the vehicle chassis geometric parameter detection system, a vehicle chassis geometric parameter measurement system consisting of LED type 3D surface measurement sensors is designed based on stereo photogrammetry, using a structured LED light source to form a “spatial measurement area” based on the entire wheel side surface and wheel cover edge. By using 3D photography technology to obtain point cloud data under dynamic measurement, and combining with x-line software, a 3D wheel hub model is established to analyze and calculate the front toe camber angle of the chassis, the linearity and repeatability of the measurement system. The results show that linearity error of this measurement system is 1.528', repeatability error of front toe angle and camber angle are ±0.03' and ±0.05' respectively, verifying stability and reliability of the measurement system.

x-3Dsurface measuring technology  /  Stereophotogrammetric measurement  /  Structured LED light