CO2MPAS known limitations

(as of v1.5, "Stamp" release)

Model sensitivity.

The sensitivity of CO₂MPAS to moderately differing input time-series has been tested and found within expected ranges when a single measured WLTP cycle is given as input on each run - if both WLTP H & L cycles are given, even small changes in those paired time-series may force the model-selector http://co2mpas.io/explanation.html#model-selection to choose different combinations of calibrated model, thus arriving in significantly different fuel-consumption figures between the runs.

Note that as of version 1.4.X the model selector is by default disabled. CO₂MPAS is calibrated independently on WLTP-H data for NEDC-H prediction and WLTP-L data for NEDC-L prediciton. It is possible to enable the model-selector for engineering purposes

Theoretical WLTP.

The theoretical WLTP cycles produced MUST NOT be used for declaration - the profiles, both for Velocities and GearShifts are not up-to-date with the GTR. Specifically, these profiles are generated by the python WLTP project which it still produces GTR phase-1a profiles.

Input file.

Please note that from version 2.2.6 of the input file, released in February 2017 with the STAMP release, the Input tab contains links to the CO₂MPAS glossary that extend/complement the comments provided in the input file (Column F of the Excel file). Those links may not work properly for Microsoft Excel versions 2013 and newer.