Design and Manufacturing of Axle Counting Equipment

The axle counting equipment is one of the important devices in the railway signal control system, which helps the system to operate safely and accurately. Currently, the axle counting devices commonly used in the Vietnamese railway signaling system are mainly imported. This article presents a solution for manufacturing axle counting equipment for Vietnamese railways. The operation principle of the axle counting sensor is based on the change of the magnetic flux through the receiving coil when the wheel passes the sensors. The signal processing of the alxe counter based on the amplitude and phase of the voltage received from the receiver coil will recognize the state of the wheel occupying the sensor space. Sensors and processing circuits have been successfully fabricated and tested on several routes in Vietnam railways. The results show that the signal threshold between passing train and no train is clearly distinctive. The count value of axle is transmitted to the Control center through a highly reliable CAN communication network. The manufactured devices can be applied to Automatic Warning System at level crossings, Automatic Block Signaling, Centralized Traffic Control.