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Understanding pre-crash speed sampling by the VAG Event Data Recorder
1Netherlands Forensic Instititute, the Netherlands.
Forensic Science International
|September 18, 2023
Summary
Volkswagen Audi Group (VAG) vehicles since 2018 record "Speed, Vehicle Indicated" from the instrument panel. This data, averaged from front wheel speeds with a 5% offset, is unaffected by mileage blockers.
Area of Science:
- Automotive Engineering
- Data Forensics
- Vehicle Safety Systems
Background:
- European Volkswagen Audi Group (VAG) vehicles feature accessible Event Data Recorders (EDRs) from 2018 onwards.
- The "Speed, Vehicle Indicated" data element is crucial for accident reconstruction, providing 11 pre-crash speed samples over 5 seconds.
Purpose of the Study:
- To identify the precise data source and characteristics of the "Speed, Vehicle Indicated" element recorded by VAG EDRs.
- To investigate potential impacts of instrument panel manipulation, specifically mileage blockers, on EDR speed data.
Main Methods:
- Directly accessed and analyzed data from the vehicle's Controller Area Network (CAN) transmissions.
- Investigated the EDR data source without needing to activate the Event Data Recorder.
- Tested a 2019 Volkswagen Golf R equipped with a mileage blocker device.
Main Results:
- The "Speed, Vehicle Indicated" data originates from specific CAN transmissions originating from the instrument panel.
- The recorded speed is an average of the front wheel speeds and exhibits a 5% offset from the actual vehicle speed.
- A mileage blocker device was found to not influence the EDR-recorded speed values.
Conclusions:
- The EDR speed data in VAG vehicles is reliably sourced from instrument panel CAN transmissions.
- The identified 5% offset should be considered during accident reconstruction using this data.
- Mileage blockers do not interfere with the integrity of EDR-recorded speed data.
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