WHEEL SLIP RATE CONTROL USING SYNCHRONIZED SPEED PULSE COMPUTING

Abstract

Antiskid brake control systems for wheel slide protection have been installed on recent rolling stocks in Japan. In such systems, it is essential to avoid increasing braking distance and causing wheel flats under wet conditions. In order to improve air braking pressure control and to keep wheel slip rates small in microslip wheel rotation, an antiskid brake control system, named the slip rate control, and a new pressure intensifier cylinder with wheel slide control valves were developed for the Shinkansen brake. The measured processing speed pulses achieved shorter calculation time of each wheel speed/deceleration and rapid wheel slip detection. The extension of emergency braking distance was under 4.5% compared with approximately 20% of braking distance using conventional antiskid systems under wet conditions. This system was adopted into the brake of Shinkansen series E2, E3, and E4 for more than 200 vehicles.