Axle load sensor is designed for cargoweight control on each of the axles of a vehicle using a tracking systems. Axle load sensor can be connected to the analog input of tracking device for example, vehicle sensors, displacement sensors, strain gauges, load cells, pressure sensors, etc.
Withaxle load sensor, a vehicle tracking system gets valuable information about the location & time of loading, unloading, notifies drivers about exceeding the axle load, shows the determined parameters on the display in the driver’s cab and to transfers the values of the loads along the axes and the weight of the cargo to the monitoring system.
The number of sensors installed on a truck can vary from 2 to 12 pcs, depending on the configuration of vehicles. The weight parameters and axial loads are read by the tracker via the RS-485 interface using the data protocol.
The weighing system includes: a Eurosens Difference-T controller, a pressure sensor (a displacement sensor) or other, Display RS and a set of cables.
Eurosens Difference-T is an analog-digital converter. It is used as a part of Eurosens Difference onboard weighing system: Receives information from a sensor with an analog output.
The Difference-T controller is designed to obtain the information from one of the sensors with an analog output, convert the analog signal into digital data for subsequently transferring it to the Display RS to store it in the calibration table with the mass-dimensions parameters of the tractor or trailer (semi-trailer).
Remote axle load control and cargo weight calculation are highly demanded features of the GPS tracking systems.
Each analog sensor is connected via a Difference-T controller of axle load transfer with each sensor under its own address. If it is not necessary to measure the weight of the cargo (and warning about exceeding the axle load) – Display is not necessary.
Display RS is designed for calculation of loads along the axes and weight of the cargo based on the readings received from the Difference-T controllers, and for the displaying of loads along the axes and the weight of the cargo in the driver’s cab.
Display RS has a digital display (9 characters), two buttons and two LEDs. The digital display is intended to display the weight parameters of the vehicle and trailer. The left button is used to switch menu items of various vehicle weight characteristics (axle load, total weight, load weight), the right button switches menu items in reverse order.
Receives information about axle loads from the Difference-T controllers. Determines the weight of the cargo based on the mass-dimensions of the tractor or semitrailer truck.
Displaying of the axle load and weight of the cargo on the special indicator in the driver’s cab.
Warning of exceeding the permissible load on one of the axles. Output to RS485 interface of cargo weight.
The green LED, which is located in the upper right corner of the Display RS, indicates the presence of power in the weighing system. The upper left red LED indicates the mode of the system.
If the red LED is continuously lit, it indicates that there is no communication with one or several Difference-T units. If the LED blinks with a frequency of 2 seconds, this means that the load on one of the axes has exceeded the threshold, which is equal to 5 tons by default.
Note: After connecting the Display RS to the weighing system connector, it may take some time (about 4 seconds) for the Display RS to poll all the Difference-T units. At this point, the red LED may be lit.
The names of the menu items and the values of the parameters change each other automatically with a frequency of 4 s.
If the Display RS remains connected to the system connector for more than 10 minutes and during this time the driver did not press the button for switching menu items, the digital display goes to sleep mode. At the same time, the power and operation LEDs still works. The digital display will switch ON again after one of the display buttons is pressed. This will not switch the menu item.
The number of EUROSENS Difference-T controllers, which is equal to the number of analog sensors, is determined from the configuration of a specific vehicle.
The number of sensors to be installed and its location primarily depends on the number of axles on vehicles, the number of lifting axles and the type of suspension used. For air suspension – Difference 01 pressure sensors must be used and for leaf spring suspension – Difference 02 displacement sensors (or other analogue sensors).
The method of determining the location and number of sensors consists of the following:
a.) It is necessary to determine the number of axles of vehicles. The nearby axes (trolley) are considered as one conditional axis.
b.) After it is needed to determine the minimum number of sensors to be installed, taking in account that on each conditional axis there must be installed at least one sensor. The exception is the “tractor + semitrailer” configuration, where no sensor is placed on the front axle. In this case, the load on the front axle is determined based on the load on the tractor’s rear axle, on the position of the fifth wheel coupling and the distance between the front and rear axles of the tractor.