Fuel accounting and control
One of the most important functions of Fleet Management System is fuel accounting. We offer several ways of fuel consumption accounting:
1. Calculation of driven distance, according to GPS data, and assessment of fuel consumption, considering the fuel rate, assigned to certain automobile.
| Advantages: | No additional costs for equipment and installation works. |
| Drawbacks: |
Low accuracy. There is no possibility to consider the load level of automobile. |
| Recommended: | This method is recommended for calculation of fuel consumption of passenger automobiles. |
| Error: | 5 - 15 %. |
2. Connection of factory fuel tank float. It is cheap and relatively accurate method of fuel accounting, when the readings of fuel tank level are read by connecting data input channel of Fleet Management System directly to factory automobile float.
| Advantages: |
Cheap installation – it is paid only for float installation works and tank calibration. Measuring quantity of fuel in tank and quantity of filled/poured off fuel. |
| Drawbacks: |
Low accuracy (depends on the quantity of fuel float and its wear level ). There are “death zones”, where fuel level cannot be measured (in case of almost full and/or empty fuel tank. It can be connected not to all models of automobiles. |
| Recommended: | This method is recommended for calculation of fuel consumption of passenger automobiles and trucks. |
| Error: | ~10 %. |
3. Connection to internal CAN network. It is possible to connect to automobiles, in the internal network of which data are transmitted according to the standard SAE J1939. Majority of new trucks and tractors (from ~2004) is transmitting data, according to aforementioned standard. Depending on the model of automobile, it is possible to monitor a moment fuel consumption and/or fuel tank level readings.
| Advantages: |
No intervention to automobile tank is required. Low price of additional equipment and installation works. There is a possibility to monitor a moment fuel consumption and/or fuel tank level. |
| Drawbacks: |
Limited resolution of fuel tank (t/255, where t – volume of fuel tank). It can be connected not to all models of automobiles. |
| Recommended: | This method is recommended for calculation of fuel consumption of the latest trucks and tractors. |
| Error: | ~5%. |
4. Installation of additional fuel level probe in tank. Fuel tank is drilled and an accurate fuel level probe is installed.
| Advantages: |
An accurate fuel residue in tank is displayed. It is possible to monitor the quantity of fuel filled/poured off the tank. Suitable for fuel tanks of various sizes (up to 1,4 m height). |
| Drawbacks: | Invasion to fuel tank is necessary. |
| Recommended: | Recommended for installation in trucks, tractors and other automobiles with large volume fuel tanks. |
| Error: | 1-4% (depending on tank size and form). |
5. Installation of additional fuel flow meters.
In this case a pair of fuel flow meters is installed, one meter counts the quantity of fuel intake to engine, the second meter counts the excess amount of fuel coming back from engine to tank.
| Advantages: |
An accurate accounting of fuel consumption. Suitable for vehicles, consuming much fuel, but going less. Suitable for vehicles, going through rugged location. |
| Drawbacks: |
High price of equipment and installation works. Measurement error dependency on the size of fuel flow. |
| Recommended: | Recommended to be installed into tractors, trucks and other automobiles with high fuel consumption. |
| Error: | from 2% (depending on fuel flow). |
We hope that these guidelines will help you to select the most acceptable method for fuel consumption control. BCE fleet management system will accumulate the data and send it to the central server, where it can be downloaded and analyzed at any time with the help of BCE software.
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