Abstract
The Brake Demand Operating device can not measure the absolute vehicle velocity due to wheel slide or lock. Therefore I studied a measurement to use a servo type acceleration sensor, and apply digital integral to the signals obtained with the microprocessor. In the brake system, the interaction is performed on a print circuit board, such as the Brake Demand Operating device. I perform experiments by using test vehicles on test line in the Railway Technical Research Institute and on a service line in JR. This paper reports the knowledge of the measurement of absolute velocity of railway vehicles obtained from those experiments.
