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Study of the Measurement of Generation 2 Toyota Event Data Recorders in Low-Speed Side Impacts
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on April 06, 2021 by SAE International in United States
Event: SAE WCX Digital Summit
Event Data Recorders (EDRs) are often utilized to determine or validate the severity of vehicle collisions. Several studies have been conducted to determine the accuracy of the longitudinal change in velocity (ΔV) reported by vehicle EDRs. However, little has been published regarding the accuracy of EDRs that are capable of reporting lateral ΔVs in low-speed collisions. In this study, two 2007 Toyota Camrys with 04EDR ECU Generation modules (GEN2) were each subjected to several vehicle-to-vehicle lateral impacts. The impact angles ranged from approximately 45 to 135 degrees and the stationary target vehicles were impacted at the frontal, central, and rear aspects of both the driver and passenger sides of the vehicles. The impact locations on the bullet vehicles were the front and rear bumpers and the impact speeds ranged from approximately 8.0 to 17.7 km/h. Instrumentation was mounted at the center of gravity of the target vehicles, as well as on the front reinforcement bar, rear body panel, B-pillar, and C-pillar to evaluate the varying lateral ΔV readings from the 3 sensor locations (ECU, B-Pillar, C-Pillar) represented in the Toyota EDR data reports and to account for rotational effects on the data. The lateral ΔVs reported by the Toyota EDRs were then compared to the recorded ΔVs from the instrumentation mounted within the vehicles. A comparison of the data revealed a general under-reporting of impact severity from the Toyota EDRs at the ECU sensor. Differences in reported values between the 3 aforementioned Toyota sensor locations, as well as non-triggers and longitudinal ΔV triggers from the Toyota EDRs were also evaluated.