Fuel accounting

          One of the main functions of fleet management system is the fuel accounting. The accounting of fuel consumption can be performed in several ways:

1. One of the easiest and cheapest ways for accounting of fuel consumption is the calculation of  the driven distance based on GPS data and evaluation of fuel consumption considering the fuel rate assigned to a vehicle.

Advantages:     There are no extra costs for equipment and installation work.
Disadvantages: Low precision.
                          The level of car loading, traffic, air conditions are not taken in to account.
Recommendations: This approach is recommended for calculating the consumption of vehicles.
Error: 5-15%

2. The connection of the conventional fuel gauge. This is a cheap and relatively accurate fuel accounting method, when the indications of fuel tank level are read by connecting the input channel of the fleet management system data directly to the conventional fuel gauge.

Advantages:     The connection is cheap – only the connection work of fuel gauge and tank calibration   
                          is priced. The instantaneous fuel quantity and added/poured fuel quantities can be monitored.
Disadvantages: Low precision (it depends on the quality of the fuel gauge and its deterioration level). 
                          There exist “blind zones”, where the fuel level cannot be measured (when the fuel tank is nearly
                           full/empty).
                          Not all car models can be connected to the system.
Recommendations: This approach is recommended for calculating the fuel consumption of passenger cars and trucks.
Error: ~10%

3. The connection to car‘s internal CAN network. This method allows you to connect to a vehicle in which  its intranet data is transmitted in accordance to SAE J1939. Under this standard the data can be transmitted by the majority of new heavy duty vehicle: trucks, tractors, trailers, etc. (from ~2004). Instantaneous fuel consumption and/or  indications of fuel tank level can be monitored depending on the vehicle’s model.

Advantages:      The intervention into the fuel tank is not required.
                           Low cost of additional equipment and installation work.
                           Allows to monitor the instantaneous fuel consumption and/or fuel tank level.
Disadvantages: The fuel tank resolution is restricted (t/255, t – the capacity of fuel tank)
                          The system is not suitable for all car model.
Recommendations: This approach is recommended for calculating the fuel consumption of new heavy duty vehicles.
Error: ~5%

4. The mounting of an additional fuel tank probe. The fuel tank is perforated and the accurate fuel level probe is mounted.

Advantages:     The exact balance of the fuel in the tank is displayed.
                          Added/poured fuel quantities can be monitored.
                          The probe is suitable for fuel tanks of various heights (up to 1.4 m high).
Disadvantages: The invasion into the fuel tank is required.
Recommendations: This method is recommended for the heavy duty vehicles (trucks, tractor, trailers, etc.) with large
                               fuel tanks.
Error: 1-5% (depending on the size and shape of the tank)

5. The mounting of additional fuel rate meters. In this case, a pair of fuel rate meters is mounted: one meter indicates fuel intake from the tank to the engine, the second one indicates the excess quantity of fuel returning from the engine to the tank.

Advantages:      Precise accounting of fuel consumption.
                          This method is suitable for vehicles with high fuel consumption, but low run.
                          Suitable for vehicles travelling through rugged terrain.
Disadvantages: High cost of equipment and mounting.
                          Measurement errors depend on the fuel flow rate.
Recommendations: This approach is recommended for the heavy duty vehicles (trucks, tractor, trailers, etc.) with high
                                fuel consumption.
Error: over 2% (depending on the fuel flow)

             We hope that these guidelines will help you to choose the most reasonable method of fuel consumption control. Our fleet management system will accumulate and send the information to the central server, from where the information can be downloaded and analysed with the help of our software at any time.
“Baltic Car Equipment” apply flexible pricing policy. The price of transport control system depends on functionality of the module, amount of the modules, etc.