With the global proliferation and standardisation of Event Data Recorders (EDRs) in motor vehicles, data fusion across different vehicle brands during accident reconstruction faces technical challenges stemming from incompatible parameter systems. This study examines two representative vehicles – a Toyota (2010 model year, Association for Computing Machinery (ACM) supplied by DENSO) and a Jeep (2014 model, ACM supplied by TRW) as representative subjects. Utilising Bosch Call Detail Record (CDR) tools to extract real collision data, this study systematically compared differences between Japanese and American EDR parameter systems across six dimensions: event recording architecture, collision pulse (ΔV) sampling strategy, pre-collision data acquisition, restraint system trigger logic, data integrity markers, and parameter notation conventions. Findings reveal: Toyota EDR possesses comprehensive multi-event temporal correlation fields yet employs a compliance-oriented minimalist strategy characterised by low sampling frequency and limited parameter types. Jeep EDR demonstrates high sampling precision and rich parameter coverage, enabling detailed recording of driver evasive manoeuvres, but exhibits weaker event management logic through a product competitiveness-driven expansive strategy. Significant discrepancies exist between the two systems in event numbering logic, sampling standards, ΔV symbol definitions, and incomplete event representation methods, directly creating technical barriers to cross-brand accident reconstruction. This study constructs a four-dimensional comparative framework, extracts quantifiable difference metrics, and analyses typical cases to reveal the root causes of these discrepancies. It proposes standardisation recommendations including unified event benchmarks, standardised sampling frequencies and parameter sets, unified coordinate system definitions, and the promotion of common data formats. This provides theoretical foundations and technical support for the integrated application of multi-brand EDR data and the scientific advancement of traffic accident investigation.
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Share and Cite
Chen, D. (2025) A Comparative Study of Event Data Recorder (EDR) Parameter Systems in American and Japanese Passenger Vehicles: Using Actual CDR Data from Toyota (2010 Model) and Jeep (2014 Model) as Examples. Scientific Research Bulletin, 2(6), 1-11.