Maximum adhesion control for Shinkansen using the tractive force tester

The acceleration and deceleration rate of the train depend on the tractive force. When the wheels of the train slip on the rails, the electric torque is decreased to avoid the continuous slipping. This reason is that the tractive coefficient between the wheels and the rails has a peak at a certain slip velocity and the over slipping should be avoided. But this adhesive phenomenon is not clearly examined or analyzed. Thus we have developed new adhesion test equipment, and we measured the tractive force with this equipment, and clarified the adhesive phenomenon. Then, we proposed a maximum tractive force control in the slip region and verified the validity of the proposed control scheme.