AxGuard

Detecting vehicles, determining positions, securing routes - HANNING & KAHL systems for vehicle detection make sure you have all these processes safely under control. In compliance with different project requirements, HANNING & KAHL deploys various proprietary systems to secure routes and for passive detection of rail vehicles. 

Track circuit for detection of wheelshunt
while its axles produce a short circuit (< 0.3 Ohm, max.5uH) in the track area, the rail vehicle is reliably detected by the electronic system. 

Blocking circuit for detection of the combination of wheelshunt and vehicle mass
The blocking circuit recognises entry of the rail vehicle passively by the wheelshunt (< 1 Ohm, max. 5uH) produced and vehicle exit by the diminishing vehicle mass detected. 

In both detection procedures, a wheelshunt of < 0.3 Ohm or  < 1 Ohm is necessary. 

However, checking/verifying wheelshunt and wheel rail contact on a vehicle can often be difficult. Individual punctual measurements on a wheel tyre are not effective in this case because the wheelshunt is to be assessed via the passing wheel. HANNING & KAHL’s wheelshunt detector AxGuard can solve this problem. Composition consists of a test track circuit, the length of which is to be calculated in such a way that the axle of one bogie leaves the test track circuit before the next axle crosses the segment. In the measurement segment, a detector stage especially designed for the test track circuit continuously determines the wheel rail contact, the resulting frequency distortion and amplitude distorti.

After the crossing by the rail vehicle, AxGuard performs a qualitative assessment of each axle. The speed is recorded and taken into account in the assessment. Based on a user-defined tolerance range, the assessment can be displayed, for example, on a PC-based traffic-light diagram (red-yellow-green) or via signals in the outside area displaying the status to the rail vehicle driver.

To ensure consistently high test accuracy, the system features an automated calibration function. Relevant measurement and system parameters are recorded, checked and, where necessary, adjusted during the crossing under real operating conditions. This enables deviations to be detected and compensated for at an early stage, reduces the manual testing and maintenance effort, and ensures consistent, reproducible test quality.

Interfaces to HANNING & KAHL‘s ConnAct® system also enable digital vehicle protocols to be compiled and managed.