This page contains the most Frequently Asked Questions regarding CO2MPAS model, regulation and inputs.

For more questions, please visit: https://github.com/JRCSTU/CO2MPAS-TA/wiki/FAQ


Where can the user download the latest version of the CO2MPAS?

To download the CO2MPAS latest version click here. To be notified of every CO2MPAS release, watch our GitHub repository.

Is CO2MPAS free and will it be in the future?

CO2MPAS is and will be free. To maintain it under the current EUPL license, any modifications made to the program, or a copy of it, must be licensed in the same way: EUPL.

What is CO2MPAS physical background and which formulas are applied?

CO2MPAS is a backward-looking longitudinal-dynamics CO2 and fuel-consumption simulator for light-duty M1 & N1 vehicles (cars and vans). To check the formulas the user can visit the functions’ description pages.

Where can the user find information on the status of the validation?

Detailed validation reports are provided together with every major release of CO2MPAS in the validation chapter of the wiki.

Validation is performed as well by independent contractors (LAT) of DG CLIMA. Moreover, some stakeholders have conducted independent validation tests on real cars in collaboration with the JRC. The results of these tests have been included in the above-mentioned reports as “real cars”.

Where can the user find CO2MPAS workshop material?

Workshop material is always uploaded in the presentation chapter.


What is the Data synchronization tool and how does it work?

Synchronization of data from different sources is essential for robust results. CO2MPAS syncing tool uses a common signal as a reference. To avoid time-aligned signals, we advise using the velocity present on the dyno and the obd at the same time. syncing tool will shift and re-sample the other signals according to the reference signal provided. The user is allowed to apply different ways of re-sampling the original signals. For more information, please see the instructions.

What is the model selector?

CO2MPAS consists of several models. If the user provides both WLTP-H and WLTP-L data, the same models will be calibrated twice, according to the data provided by each configuration. If the option model selector is switched on, CO2MPAS will use the model that provides the best scores, no matter if the model was calibrated with another cycle. For example, if the alternator model of the High configuration is better, the same model will be used to predict the Low configuration as well.

Is it possible to simulate other cycles than NEDC or WLTP? How about real on-road tests?

Yes, CO2MPAS can simulate other cycles, as well as on-road tests. The user can simulate using several extra parameters beyond the official laboratory-measured ones. The user can input the velocity profile followed, road grade, extra auxiliaries losses, extra passengers, different road loads, temperatures, etc. The user will find an example file when downloading the demo files.

Is the usage of internal / development signals allowed (if equivalence is shown)?

OBD signals are regulated and the only one to be used.

What is the start-stop (S/S) activation time?

S/S is the time elapsed from the beginning of the NEDC test to the first time the Start-Stop system is enabled, expressed in seconds [s].

How to insert a new drive_battery_technology for hybrid electric vehicles?

The parameter already contains a preselection of drive batteries technologies as a drop-down menu. If you need to insert a different technology, you should remove the “data validation rule” of the excel input file, insert the new data and proceed with the co2mpas run.