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It mentions not only the testing mechanism, but also the system’s mechanical structure and the detailed methods of hardware and software of the according testing equipment. It comparatively covers the whole studying and developing process of the system. Advanced technology, such as, computer, electronics, sensors and air-pressure driving method are adopted in the system, which not only realize automatic tracking, accurate positioning and fast testing, but also makes it possible to be low in cost, easy to be handled, as well as its high accuracy and powerful net performance.

It is studied that a great proportion of traffic problems lies in vehicles’ steering system, and the maximum steering angle decides their steering capability and their minimum turning radius. The measuring principle of rapid measuring system, and the automatic tracking principle of measurement system have been analyzed in the paper. Also, the infrared tracking, the measuring plate positioning, the calculation of minimum turning radius, and the processing method of the test results have been described in detail. It is proved that the automatic automobile steering angle detecting system has reached the general requirements both in detection resolution and the measuring accuracy.