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EU's Type-Approving vehicle simulator predicting NEDC CO2 emissions from WLTP
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CO2MPAS: Vehicle simulator predicting NEDC CO2 emissions from WLTP

3.0.X: from 01-Feb-2019 to 01-Jan-2020
4.1.X: from 31-Oct-2019
rel_date:2019-11-07 12:00:00
keywords:CO2, fuel-consumption, WLTP, NEDC, vehicle, automotive, EU, JRC, IET, STU, correlation, back-translation, policy, monitoring, M1, N1, simulator, engineering, scientific
mail box:CO2MPAS Team: <>
copyright:2015-2019 European Commission (JRC)
license:EUPL 1.1+

What is CO2MPAS?

CO2MPAS is backward-looking longitudinal-dynamics CO2 and fuel-consumption simulator for light-duty M1 & N1 vehicles (cars and vans), specially crafted to estimate the CO2 emissions of vehicles undergoing NEDC testing based on the emissions produced WLTP testing during :term:`type-approval`, according to the :term:`EU legislation`s 1152/EUR/2017 and 1153/EUR/2017 (see History section, below).

It is an open-source project (EUPL 1.1+) developed for Python-3.6+. It runs either as a console command or as a desktop GUI application, and it uses Excel-files or pure python structures (dictionary and lists) for its input & output data.


The European Commission has introduced the WLTP as the test procedure for the type I test of the European type-approval of Light-duty vehicles as of September 2017. Its introduction has required the adaptation of CO2 certification and monitoring procedures set by European regulations (443/2009, 510/2011, 1152/EUR/2017 and 1153/EUR/2017). European Commission’s Joint Research Centre (JRC) has been assigned the development of this vehicle simulator to facilitate this adaptation.

The European Regulation setting the conditions for using CO2MPAS can be found in the Comitology Register after its adoption by the Climate Change Committee which took place on June 23, 2016, and its 2nd vote for modifications, in April 27, 2017.


Two installation procedures can be followed:

Official (for type approval)

To install CO2MPAS you have to download the installer and then execute it (see the steps shown in the video below).

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After the installation, two icons will appear on your desktop: one for the GUI and one for the console.

co2mpas desktop icons

IT Requirements

To run CO2MPAS for Type Approval purposes (i.e CO2MPAS official) some minimum IT requirements are mandatory:

  • 64-bit Intel or AMD processor (x86_64, aka x64, aka AMD64),
  • Microsoft Windows 7 SP1, or later,
  • 4 GB RAM (more recommended),
  • 4 GB hard disk storage for installing the software,
  • Execution-rights to the installation folder (but no Admin-rights),
  • (optional) Excel, to view & edit simulation’s input and output files,
  • Chrome/Firefox/Safari/Edge or IExplore 10+.

Ordinary (for developers and/or researchers)

To install CO2MPAS use (with root privileges):

$ pip install co2mpas

Or download the latest git version and use (with root privileges):

$ python install
Install extras

Some additional functionality is enabled installing the following extras:

  • cli: enables the command line interface.
  • sync: enables the time series synchronization tool (i.e., syncing previously named datasync).
  • gui: enables the graphical user interface.
  • plot: enables to plot the CO2MPAS model and the workflow of each run.
  • io: enables to read/write excel files.
  • dice: enables the Type Approval mode.
  • driver: enables the driver model (currently is not available).

To install co2mpas and all extras, do:

$ pip install co2mpas[all]

Quick Start

The following steps are basic commands to get familiar with CO2MPAS procedural workflow using the command line interface:

Run in engineering mode

To run CO2MPAS in engineering mode with some sample data, you have to:

  1. Generate some demo files inside the ./input folder, to get familiar with the input data (for more info check the link):

    ## Generate the demo files and open a demo file.
    $ co2mpas demo ./input
    $ start ./input/co2mpas_conventional.xlsx
  2. Run CO2MPAS in engineering mode and inspect the results in the ./output folder. The workflow is plotted on the browser (for more info check the link):

    ## Run co2mpas and open the output folder.
    $ co2mpas run ./input/co2mpas_conventional.xlsx -O ./output -PL
    $ start ./output

Output workflow

Input file

To create an input file with your data, you have to:

  1. Generate an empty input template file (i.e., vehicle.xlsx) inside the ./input folder:

    ## Generate template file.
    $ co2mpas template ./input/vehicle.xlsx -TT input
  2. Follow the instructions provided in the excel file to fill the required inputs:

    ## Open the input template.
    $ start ./input/vehicle.xlsx

Input template

Data synchronization

To synchronize the dyno and OBD data with the theoretical cycle, you have to:

  1. Generate a synchronization template file wltp.xlsx:

    ## Generate template file.
    $ co2mpas syncing template ./to_sync/wltp.xlsx -CT wltp -WC class3b -GB automatic


    With the command above, the file contains the theoretical WLTP velocity profile for an automatic vehicle of class3b. For more info type co2mpas syncing template -h or click the link

  2. Fill the dyno and obd sheets with the relative data collected in the laboratory:

    ## Open the input template.
    $ start ./to_sync/wltp.xlsx
  3. Synchronize the data with the theoretical velocity profile:

    $ co2mpas syncing sync ./to_sync/wltp.xlsx ./sync/wltp.sync.xlsx
  4. Copy/Paste the synchronized data (wltp.sync.xlsx) contained in the synced sheet into the relative sheet of the input template:

    ## Open the synchronized data.
    $ start ./sync/wltp.sync.xlsx

GUI start-up

To launch the CO2MPAS GUI from the console, you can use the following command:

## Open the GUI of co2mpas.
$ co2wui run

GUI start-up

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