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JWJ-C Axle Counting System

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HTK Railway Technologies Co., Ltd.


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  • Chinese Supplier

  • CCCME Member

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The JWJ-C Axle Counting System supplied by HTK Railway Technologies, is a trackside system designed to automatically and reliably detect clear or occupied tracks on various rail lines such as trunk lines and branch lines in stations, factory lines and light/metro rails.

The system can work with all types of fully automatic and half automatic interlocking systems by providing accurate and reliable track blocking information through replay interfaces in parallel.

JWJ-C ACS has been a proven product with thousands installations in the past decade. So far, JWJ-C ACS have been installed in China Railway, trunk line of Viet Nam Railway and light rail of Hanoi.

The system got approval from China National Railway Bureau and passed safety assessment by ATKINS, an international independent safety assessment organization.


Fig. 1 JWJ-C Axle counting system site in Viet Nam Railway


Fig. 2 Certificate of Independent Safety Assessment by ATKINS

How the system works

When a train approaching the detection point and wheels rolling over the wheel detector, the alternating electromagnetic field generated by and between the transmitter and receiver of the detector will be changed. Also changed is the voltage induced in the receiver’s coil of the detector.



The JWJ-C ACS consists of two parts: detection point equipment at trackside and evaluation computer associated with power supply, communication and UPS, etc. accommodated in a 19” cabinet.

One detection point includes:

Dual wheel detector; and A trackside connection box.



Wheel detector

Each unit of wheel detector contains two components: one is transmitters (TX1 & TX2) in dual mounted at outside of rail and the other is receivers (RX1 and RX2) in dual too at gauge side. 


Fig. 5 Dual transmitter at outside of rail     Fig. 6 Dual receiver at gauge side of rail


Both transmitters and receivers are insulated from the rail when being mounted on rail to eliminate interference from traction return current on electric line.

Specifications of wheel detectors


Working   principle

Phase   detection

Working   frequency

31.25   KHz, 34.25 KHz

Working   temperature range

-40   ~ +80℃

Protection   level


Anti-explosive   level


Train   speed

0   ~ 350 km/h

Rail   type

All   types


Clamped   directly to the rail with insulation


Anti-vibration,   aging-proof, anti-corrosion, water-proof, theft-proof


The   insulation resistance between the magnetic core and the enclosure is no less   than 500 MΩ/500V

Train   conditions

The   wheel and rail wear, gauge differences, wheelset movement will not affect the   normal working of wheel detectors.


Trackside connection box

The connection box is installed at trackside to receive the signals from the receivers of wheel detector and initially process (modulating amplitude and frequency) the signals then send to the evaluation computer.



Fig. 6 Connection box and the front panel of the connector

Specifications of trackside connector

Power   supply

AC220V   (-20% ~ +15%), 50Hz

Power   consumption

Max.   12W

Working   DC voltages

5V   (1±5%); 12V (1±3%) and 24V (1±3%)

Signal   transmitting

Transmitting   voltage:    AC 12V ~ 40V

Transmitting   frequency:  f1=31.25 KHz (1±1‰)

                       f2=34.25 KHz (1±1‰)

Signal   wave shape:      sine

Signal   receiving

Receiving   voltage: DC 55mV ~ 700mV without wheel pass

                 DC – 55mV ~ -700mV with   wheel pass

Communication   interface with evaluation computer via CAN BUS

Protocol:   ISO11898, CAN version 2.0

Rate:   Max. 10kbit/s

Distance:   Max. 3 km (double twist cable)

Error   control and verification: CRC and ARQ

Communication   interface with evaluation computer via MODEM

Protocol:   ITU-T v.23, two-wire, full duplex

Rate:   1200 bit/s

Transmitting   voltage: <=0dB (adjustable)

Receiving   sensitivity: >= -20dB



Fig. 7 Components structure diagram of a detection point 

The evaluation computer provides to process the received signals to detect out if the track section is clear or occupied then send the instruction to interlocking system via relays.

There are two types of evaluation computers: Station Evaluation Computer (SEC) and Track Section Evaluation Computer (TSEC). The SEC is to detect clear or occupied tracks in station area. SEC will be able to operate with up to 24 detection points.

TSEC is used to detect track section between stations. The operating distance of TSEC is up to 20~30 km depending on conditions of interference in communication channelsf.jpgg.jpg

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