Design And Realization Of The Monitoring And Protection System Of Platform Screen Doors Based On Infrared

With the rapid development of subway systems and the rising of subway passengers, the subway platform screen doors as a major safety equipment, plays an important role to prevent passengers’ accidental falling and to be bruised by subway train. It’ s now becoming the standard configuration of the subway system. However, subway platform screen doors only can detect the obstacle between the sliding door, and if there are passengers blocked in the gap,harm can be caused easily .in recent years, China has many similar incidents occurred.Considering the subway platform’s working environment and maintenance features, this paper designed an active obstacle detection system based on infrared light curtain sensor. This system uses the computer, communications and sensor technology as the foundation, install a safe and effective infrared light curtain between the door and the train station to detect the entire side of the protection area which is almost 120 meters’ long automaticly.Microprocessor receives the detection information from the infrared light curtain to judge whether there is an obstacle between the door and the train station, and then controls the screen door open or closed based on the judgment results. When there is an obstacle between the train and platform screen doors, the alarm device installed in the head station, will send out the audible and visual alarm to alert the driver the presence of danger, until obstacle clearance.12864 LCD displays the screen door status in real time.In addition,the microprocessor transmits the alarm information and detective sensors’ operating state to the host via RS-232 bus . when abnormal accurs, it will remind the maintenance staff to manner disposal timely to enhance system reliability.The system realizes the function of showing the screen door protection, commissioning and experimental results, based on infrared light curtain. Meanwhile, the system can prevent passengers to strand in the gap between the platform and the train door effectively, which not only avoids accidents, but also reduces the time for drivers looking out and monitoring. So this system indeed improve the level of safety ,automation and intelligence, it cleared the way for the realization of the train driverless goal, and it provides more security measures for the widely use of platform technology.