Optimization of readhesion control of Shinkansen trains with wheel-rail adhesion prediction

We propose a new practical readhesion control for electric railway vehicles with three phase drive. The control circuit won't promote wheelslip/slide pehnomenon when it occurs, and the torque is slightly reduced. The former is achieved by using the lowest axle velocity of all as a frequency reference of inverters feeding asynchronous traction, motors. The latter is realized by an accurate slip/slide velocity detection. By running tests with a protptype Shinkansen train ''STAR 21'' of ''East Japan Railway'', we succeeded to utilize as high traction force as possible under any wheel-rail conditions, with the introduction of wheel-rail adhesion prediction.