Consumption model

Online Routing provides a set of parameters for a detailed description of vehicle-specific Consumption Model. Depending on the value of vehicleEngineType, two principal Consumption Models are supported: Combustion and Electric. Specifying parameters that belong to different models in the same request is an error. Consumption Model cannot be used with travelMode values bicycle and pedestrian.

Parameter constraints for consumption model

In both Consumption Models, explicitly specifying some parameters requires specifying some others as well. These dependencies are:

  • All parameters require constantSpeedConsumption to be specified by the user. It is an error to specify any other consumption model parameter, with the exception of vehicleWeight, if constantSpeedConsumption is not specified.
  • accelerationEfficiency and decelerationEfficiency must always be specified as a pair (i.e. both or none).
  • If accelerationEfficiency and decelerationEfficiency are specified, product of their values must not be greater than 1 (to prevent perpetual motion).
  • uphillEfficiency and downhillEfficiency must always be specified as a pair (i.e. both or none).
  • If uphillEfficiency and downhillEfficiency are specified, product of their values must not be greater than 1 (to prevent perpetual motion).
  • If the *Efficiency parameters are specified by the user, then vehicleWeight must also be specified. When vehicleEngineType is combustion, fuelEnergyDensityInMJoulesPerLiter must be specified as well.
  • maxChargeInkWh and currentChargeInkWh must always be specified as a pair (i.e. both or none).

Note

If only constantSpeedConsumption is specified, no other consumption aspects like slopes and vehicle acceleration are taken into account for consumption computations.

Combustion consumption model

The Combustion Consumption Model is used when vehicleEngineType is set to combustion. The list of parameters that belong to this model are below. Refer to the Parameters section for detailed description.

  • constantSpeedConsumptionInLitersPerHundredkm
  • vehicleWeight
  • currentFuelInLiters
  • auxiliaryPowerInLitersPerHour
  • fuelEnergyDensityInMJoulesPerLiter
  • accelerationEfficiency
  • decelerationEfficiency
  • uphillEfficiency
  • downhillEfficiency

Electric consumption model

The Electric Consumption Model is used when vehicleEngineType is set to electric. The list of parameters that belong to this model are below. Refer to the Parameters section for detailed description.

  • constantSpeedConsumptionInkWhPerHundredkm
  • vehicleWeight
  • currentChargeInkWh
  • maxChargeInkWh
  • auxiliaryPowerInkW
  • accelerationEfficiency
  • decelerationEfficiency
  • uphillEfficiency
  • downhillEfficiency

Sensible values of consumption parameters

A particular set of consumption parameters can be rejected, even though it might fulfill all the explicit requirements specified above. It happens when the value of a specific parameter, or a combination of values of several parameters, is deemed to lead to unreasonable magnitudes of consumption values. If that happens, it most likely indicates an input error, as proper care is taken to accommodate all sensible values of consumption parameters. In case a particular set of consumption parameters is rejected, the accompanying error message will contain a textual explanation of the reason(s). The detailed descriptions of the parameters have examples of sensible values for both models.