Axle load sensor installation
Axle load monitoring systems often use additional sensors such as GNOM. These sensors can transmit load data both via wires and over the air (BLE, Bluetooth 4.X).
To achieve high accuracy, the sensor must be calibrated after installation: loads are placed one by one in the vehicle body or trailer, and a correspondence table is created between the axle load and the sensor output signal.
The axle load sensor transmits data to the telematics device and fleet management software. The wireless GNOM sensor with BLE allows the driver to carry out on-board weighing during loading, preventing the axle load limit from being exceeded.
Requires qualified technician for proper sensor installation;
Calibration of sensor and telematics unit configuration are required.
Possibility to be installed on vehicle with leaf spring suspension system;
Data accuracy is usually higher comparing to CAN bus data;
Can be used for diagnostics of air suspension system during technical check up;
Allows axle load data monitoring via BLE on smartphone (wireless GNOM sensors).
Reading axle weight from CAN bus
Modern vehicles are usually equipped with a CAN j1939 data bus. The T-CAN may contain axle load information from standard sensors, but the presence of this data requires verification by a specialist who connects to the bus and reads the parameters.
Sometimes axle load measurement may not be possible due to corrupted or encrypted CAN J1939 data.
Axle weight data is rarely available in CAN bus;
No data in CAN bus of vehicles with spring suspension;
Not possible to use on old vehicles, which don’t have CAN bus
Accuracy of CAN data is often lower comparing to additional sensors;
No CAN bus data when ignition is off.
Low cost of solution itself (but the preparation works could be more expensive);
Easy to install contactless CAN bus readers can be used for getting axle weight data;
CAN bus readers are quicker to install then additional axle load sensors.