Abstract
To analyze slip phenomena, we propose a new practical readhesion control for electric railway vehicles with three-phase drive. The keypoints are optimized axle velocity detection, detection of small slip, slight reduction of torque and torque recovery at readhesion. By running tests with a prototype Shinkansen train "STAR 21", we obtained good results. Nevertheless, slip-readhesion iteration occurs under very bad wheel-rail conditions. So we introduced wheel-rail adhesion prediction in addition and succeeded in utilizing as much adhesion force as possible under any wheel-rail condition. Especially this control has remarkable performance under very bad conditions such as icy rail, steep gradient etc.
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