Gps-based Locomotive Headlights Automatically Find The Trace System Control Algorithm

To improve the level of the modern railway, China has implemented a great strategy which the train velocity is raised. With the large implementation of acceleration, the train velocity becomes larger and larger, the unsafe factors increase accordingly. An automatic control system based on GPS (Global Positioning System) is designed to solve the problem, which the locomotive-headlight rotate automatically to light the rail when the trains run rapidly at nighttime or in a low-visibility situation. In the past, locomotive-headlights were fixed on the locomotives' head, making light varied with the locomotive direction. However, when the locomotive went into a curve track, the light was unable to shine on the rail all the time. In order to solve the above-mentioned problem, the automatic system control the automatic rotation locomotive-headlight, using the localization signal which the GPS satellites offers, making light always shine on the center line of the track, so achieving the goal of automatically controlling locomotive-headlight. The developed countries take the lead in the application of GPS-mechantronics on earth, so the system has not only drew on the advanced experience of foreign countries, but also combined the actual conditions in China. The control algorithm of the system consists of three parts: GPS data-received subsystem, GPS data-analyzed & handled subsystem, on-board controller subsystem. GPS data-received subsystem is in charge of collecting the GPS data of the schedule railway. The core issue of GPS data-analyzed & handled subsystem is railway plan using spacialcoordinate-transform cubic spline. The function of the on-board controller subsystem is that controller receives the real time localization message GPS satellites offers, according to optimized control algorithm, calculating the angle of headlight, driving headlight to rotate. It confirms that the control algorithm is effective,according to the result of the theory calculation,the computer emulation and the practice experiment.