### Estimation of distance to empty for heavy vehicles

The distance to empty (DTE) for a heavy vehicle is valuable
information both for the driver and the hauler company. The DTE is
estimated as the ratio between the current fuel level and a
representative mean fuel consumption. This means the fuel consumption
is a prediction of the most likely future mean fuel consumption based
on earlier data. It is calculated by applying a forgetting filter
on the signal of the momentary fuel consumption in the engine. The
filter parameter control how many values that contributes to the
output. This is a balance between desired robustness and adaptability
of the estimate. Initially, a pre-stored value is used as an estimate
of the mean fuel consump- tion. By this, the driver gets a first
hint of the DTE value and the estimation of the DTE gets a good
starting point. Stored values will adapt continuously with an online
algorithm using vehicle data from previous runs. An alternative to
show- ing the DTE is to present the time to empty when the vehicle
speed is close to zero. The accuracy of the proposed algorithm
depends on the quality of the input sig- nals. With the current input
signals, it is possible to get a DTE estimate that, over a longer time
period, decrease in the same pace as the distance meter increase.
This is considered as a good validation measurement. If altitude data
for the current route would be used, a more accurate DTE estimate
could be obtained. The sample distance for this altitude data could
however be set to a 1000 meter without affecting the estimate
significantly.

*Nils Eriksson*

**2010**

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Senast uppdaterad: 2019-06-05