7. Aligning time series, the datasync tool.

The CO₂MPAS auto-calibrates based on the provided WLTP time series before predicting NEDC. The calibration of the model requires that the time series taken from the dyno and from the OBD are aligned. The time alignment of the time series is essential for an adequate functioning of the CO₂MPAS model. The model might fail in case the time series are time-shifted and/or with different sampling rates. Even if a CO₂MPAS run succeeds, the results may not be accurate enough if the signals are misaligned.

As an aid tool for CO₂MPAS, the datasync tool, available from the Synchronize tab of the GUI, has been provided together with the main program to help synchronizing the time series. This command reads one or more tables from excel-files and synchronizes their columns.

The necessary steps that the user needs to perform in order to synchronize time-series signals are the following:

• create a datasync template that will contain the reference theoretical speed profile.

• in the created file, the tab ref is now populated with times and velocities of theoretical speed profile. The second and third tabs (dyno and obd) need to be populated by the user. In dyno and obd tabs the user provides always times and velocities signals in order to synchronize other time-series signals from that time series.
• after dyno tab and/or obd tabs are filled with inputs that need to be synchronized click on the run sychronization button to synchronize and re-sample data.
• the synchronized data will appear in the first ref tab. Copy the synchronized time-series to your input file and run CO₂MPAS.

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