Design of automatic detection system online for automobile air-conditioning electromagnetic clutch

The size of friction torque and the overall performance of clutch depend on the qualities of disk drives' end runout and radial runout. For the unceasingly increased requirements on detection technology in the domestic auto industry, a detection system which is used for automatic detection on line and automatic data storage has been designed, combined computer technology with the specific requirements of automatic detection. The system centers on automatic detection and automatic data storage system, using personal computer as upper computer to realize human-machine interface, data storage and network features; using PLC as lower computer which is the core component in controlling to complete the acquisition of various signals and the output control of various actions and also using digital dial gauge as acquisition sensor to fulfill the data acquisition about the displacement of end runout and radial runout. The experimental results show that the system is responsive and of high detection accuracy. Its detection and control work well. At the same time it has the characteristics of low cost, easiness in control and operating, high reliability and and so it has certain value in practice.