Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 13, 2020 - September 16, 2020
The brake control systems used in current railways are generally open-loop structure. The braking performance tends to be affected by some disturbances, such as wheel slides, characteristics of friction components included in brake equipment. In order to stabilize automatically the braking performance, we propose a new closed-loop system which can track the train deceleration to the target value changing with the braking distance. In this method, the train velocity is fed back and is differentiated to obtain a deceleration during braking. The controller, which consists of PI gains and the Smith compensator, tracks the target value according to the fedback deceleration. When braking starts, the target braking distance is decided by the initial brake velocity and the demanded deceleration. Then the target deceleration is updated sequentially on the basis of the difference between the target braking distance and the measured one. We carried out running tests using the rolling stock equipped with the proposed method under the condition where the braking force can be degraded intentionally. The results of the test showed that the proposed method sufficiently contributes to the reduction of the increase of braking distance in case of temporary brake degradation. Therefore, it is obvious that the apply of the proposed method surely results in improving the accuracy of train stop position.
