: Vehicle simulator predicting NEDC CO₂ emissions from WLTP

release

4.3.5

rel_date

2023-11-13 15:00:00

home

http://co2mpas.readthedocs.io/

repository

https://github.com/JRCSTU/CO2MPAS-TA

pypi-repo

https://pypi.org/project/co2mpas/

keywords

CO₂, fuel-consumption, WLTP, NEDC, vehicle, automotive, EU, JRC, IET, STU, correlation, back-translation, policy, monitoring, M1, N1, simulator, engineering, scientific

mail box

<JRC-CO2DICE@ec.europa.eu>

team

copyright

2015-2023 European Commission (JRC)

license

EUPL 1.1+

What is ?

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 type-approval, according to the EU legislations 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.

History

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 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.

Installation

To install use (with root privileges):

$ pip install co2mpas

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

$ python setup.py 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 model and the workflow of each run.
• io: enables to read/write excel files.
• 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 procedural workflow using the command line interface:

• Run
• Input file
• Data synchronization

Run

To run 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 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

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

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

   Note

   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