Provided we have both fuel consumption sensor and a fuel level sensor installed. The new software module for wialon allows you to quickly compare their data on a single graph, detect unauthorized drains and quickly diagnose the operation of the equipment.
The application is here //mechatronics.by/fuel-compare-report

Follow the instructions to connect to Wialon Hosting 

Additional URL parameters must be enabled (Active SID, Current user, Base URL, Host URL, Language).

(Active SID, Current user, Base URL, Host URL, Language)

The module use fuel consumption sensor AFCS (absolute fuel consumption sensor) and a single fuel level sensor. To tell the module which sensor to use, you need to set the value of the variables “AFCS_name” (copy the name of the AFCS sensor in the field) and FLS_name (the name of the Fuel Level Sensor type) in any field of the object. ImpFCS/ InsFCS types of sensors can’t be used, it is necessary to previously make a sensor of the AFCS type on their basis.

Next, launch the application, which will load the list of equipment available from your account:

Based on the AFCS data, a graph of the virtual fuel balance in the tank will be built and compared with the FLS. Data alignment occurs during the fueling. This way, you can control the stability of the mutual error of the sensors relative to each other. For example, the theft of fuel from the return line will look like a single run-up of FlS and AFCS (while the virtual fuel balance will be larger for AFCS). The standard deviation of the virtual balance the AFCS in a big way may indicate the presence of air in the reverse route during the installation of differential flow meter (flow rate is underestimated), down – blockage of the “return”-camera.

You can also use data from the CAN bus of the car as an AFCS. In this case, the coefficient field will allow you to quickly and clearly select the factor for data convergence.

This application is also able to calculate the remaining fuel in the tank based on the data of the AFCS sensor and information about fueling, as well as the amount of fuel in the tank for the initial period.