RTRI REPORT May 2001

Adhesion Force and Skid Control at Braking

Seigo UCHIDA, Tadao OHYAMA, Yoshio NOMURA


  Appropriate brake control must satisfy two requirements, shorter stopping distances and maintenance of better wheel tread conditions. This paper introduces an analytical method based on a dynamic model of the relation between adhesion and braking forces from micro slip to gross sliding. The analysis was applied to the actual brake control of electric multiple unit cars braked from the speed of 140 km/h in consideration of the magnitude of sliding speed. Sliding was controlled according to the detected slip level. The adhesion force during braking was estimated from the analytical results. We showed that in emergency brake to minimize the stopping distance, it was effective to utilize the adhesion force in the gross sliding region at the expense of wheel tread surface deterioration from the viewpoint of safety.


* Full papers of RTRI Report are written in Japanese.

Copyright (c) 2001 Railway Technical Research Institute