Abstract: Car body matching quality is an important aspect of vehicle quality evaluation. If the matching quality is not up to standard, it will directly affect the user's sensory experience, and will also bring about problems such as sealing, operating force, and wind noise. As a means of detecting the matching quality of the car body, the on-line measurement technology of gap and flush has been applied more and more. The system composition, operating environment and performance parameters, measurement principles and scenarios of the on-line measurement of gap and flush are expounded, and the plane layout, measurement point selection, measurement process, system test content and evaluation criteria, and realized functions are introduced with practical application cases, and The influencing factors of measurement accuracy are discussed. Through the application of the gap and flush on-line measurement system, 100% measurement of the key matching points of the car body can be achieved, and it has the characteristics of fast speed, high precision, flexibility, real-time dynamic monitoring, and alarm funtion, which is important for the quality monitoring and problem analysis of the car body matching.

Key words: Car body matching; On-line measurement technology; Gap and flush

摘要： 车身匹配质量是整车质量评价的一个重要方面，匹配质量不达标直接影响用户的感官 体验，还会带来密封性、操作力、风噪等问题。作为对车身匹配质量的检测手段，间隙面差 在线测量技术得到越来越多的应用。文章阐述了间隙面差在线测量的系统构成、运行环境及 性能参数、测量原理和场景，以实际应用案例介绍了平面布局、测点选取、测量流程、系统 测试内容及评价标准、实现的功能，并探讨了测量精度的影响因素。通过应用间隙面差在线 测量系统，可以实现车身关键匹配点 100%测量，并且有速度快、精度高、柔性化、实时动态 监控、超差报警等特点，对车身匹配质量监控和问题分析有重要作用。

关键词: 车身匹配；在线测量技术；间隙面差