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• W657292258 abstract "An Event Data Recorder (EDR) is an additional function installed in the airbag control module (ACM) to record vehicle and occupant information for a brief period of time before, during, and after a crash event. EDRs are now being installed in ACMs by several automakers in the USA and in Japan. The aim of this study is to understand the performance of EDRs for the improvement of accident reconstruction with more reliable information. In the first report of the study, data obtained from EDRs of seven vehicle types were evaluated using 2006-2007 J-NCAP (Japanese New Car Assessment Program) full-lap frontal barrier crash tests and offset frontal deformable barrier crash tests data. For a more practical standpoint, thirteen crash tests reconstructing typical real-world accidents such as single vehicle accidents with barriers or poles, car to car accidents and multi rear-end collisions focusing on typical accident types in Japan were conducted. Data obtained from EDRs are compared with data obtained from optical speed sensors, instrumented accelerometers and high speed video cameras. The velocities determined from pre-crash data of EDRs and the maximum change in velocity, delta-V, and delta-V time history data obtained from post-crash data of EDRs are analyzed. The results are as follows: - Pre-crash velocities of EDRs were very accurate and reliable. The average difference between the EDR recording values and the reference speeds was 4.2 percent and the root mean square of the differences was 9.2 percent. Only two cases showed large differences for the pre-crash velocity. Both of them were cases with braking prior to the collision. However, another test with braking showed less difference. The braking condition may influence the accuracy of pre-crash velocities. - Maximum delta-Vs obtained from the EDRs showed uncertainty of measurement in several cases in comparison with the reliable delta-V data. The differences in maximum delta-V were more than 10 percent in five of twenty-five event data and more than 20 percent in two of twenty-five event data. The average of all the differences was about 4 percent and the root mean square of the differences was about 11 percent. Especially large deformations at narrow areas may influence the accuracy of post-crash delta-V. - Multiple rear-end crash tests were reconstructed using EDR data as case studies. Some EDRs recorded two events and a time gap between two events, so that these reconstruction case studies were very accurate and reliable. - If only one of three vehicles in multiple rear end crash was equipped with an EDR, overview and velocities of all cars may be reconstructed using these limited EDR data. In this case study, leading car's EDR data and middle car's EDR data were valuable. However if only the following car was equipped with EDR, the reconstruction was not accurate. (A) Paper to the session Methodologies of In-Depth-Investigations of the 4th International Conference on ESAR Expert Symposium on Accident Research, 16th to 18th September 2010 in Hannover. For the covering abstract of the conference, see ITRD D366702." @default.
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• W657292258 date "2010-12-01" @default.
• W657292258 modified "2023-09-27" @default.
• W657292258 title "Evaluation of event data recorder based on crash tests" @default.
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