Göm meny

Abstract



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

Download Article (pdf-file)Show BibTeX entry

Informationsansvarig: webmaster
Senast uppdaterad: 2019-04-23