Generating Driving Cycles

In many cases, the quality of a model (e.g. for emissions) can be validated by testing its performance on a set of various driving cycles.

Additionally and especially in the context of the Real Driving Emissions (RDE), it is interesting to evaluate models (e.g. for emissions) on a wide variety of different driving cycles in order to ensure that the whole drivable range is covered as good as possible.

ASCMO-STATIC allows the creation of any number of new virtual driving cycles that are based on a set of driving cycles that are already available, e.g. from real measurements from a test bench or the road. The generated driving cycles are similar to the already existing driving cycles and show their typical characteristics.

Note  

The generated driving cycles with ASCMO-STATIC (GUI: Calibration > Driving Cycles) or ASCMO-Cycle Generator are similar to the already existing driving cycles. They do not meet regulations or fulfill the properties of cycles which they are based on. The generation is based on a probability model (Markov chain).

Generated cycles are not intended for official purposes like RDE homologation or similar purposes.

  1. Select Calibration → Driving Cycles.

    The driving cycle manager opens.

  2. In the "Driving Cycle Manager" window, select Data → Generate Driving Cycle(s).

    A dialog window opens that lists all available driving cycles.

  3. In that window, select all driving cycles you want to use as input for the new driving cycles.

    Note  

    If you select two or more driving cycles as input, make sure that all driving cycles have the same number of operating point axes.

  4. Click on OK to continue.

    The Closed"Generate Driving Cycle(s)" window opens.

  5. In the "Generate Driving Cycle(s)" window, set the following properties:

    Weight

    The weights (integer in [1 inf]) for each driving cycle determine to what extend the respective driving cycle is taken into account when creating new cycles. A higher weight leads to a higher impact.

    If you selected only one driving cycle as base for the new ones, the weight is set to 1 and the field is read-only.

    Number of Cycles

    Determines how many cycles are to be created.

    Note that the driving cycles that serve as basis are seen as one internally, therefore they are seen as connected to each other by using a mean valued gradient.

    Use full hull range

    If activated, the full range of the hull is used for the new driving cycle(s).

    Name Prefix

    Enter the name prefix for the new driving cycle(s).

    If you create more than one driving cycle, integer numbers are attached to the name.

    Sample Time

    The generated driving cycles are calculated with a fixed sample time that can be set in the "Sample Time" field.

    Note that all driving cycles that serve as a basis for the new ones are resampled internally to the chosen sample time.

    Cycle Duration

    Here you can set the length of the driving cycles to be generated.

  6. Click on Generate.

    The specified number of new driving cycles is created. The new cycles appear on the left side of the "Driving Cycle Manager" window.

    Note  

    The new driving cycles contain only two operating point axes, regardless of the number of operating point axes in the input driving cycles.

See also

Using a Driving Cycle to Assign OP Weights

Importing Driving Cycle Data

Driving Cycle Manager