铁道部运输局明确规定 ,全路各站修所应积极推广使用微机控制单车试验器。近年来 ,一些生产厂家陆续开发了一系列微机控制单车试验器 ,但这些产品在实际生产运用中仍不能满足试验要求 ,最突出的一点是不能自动测量制动缸活塞行程。而在《铁路货车站修规程》中 ,其“制动、缓解 Transportation Bureau of the Ministry of Railways clearly stipulates that all stations throughout the repair should be actively promoting the use of computer-controlled bicycle tester. In recent years, a number of manufacturers have developed a series of computer-controlled bicycle tester, but these products still can not meet the test requirements in the actual production and use, the most prominent point is that it can not automatically measure the brake cylinder piston stroke. In the “Railway Freight Station repair regulations”, its "brake, ease