Accuracy of Event Data in the 2010 and 2011 Toyota Camry During Steady State and Braking Conditions

2012-01-0999

04/16/2012

Event
SAE 2012 World Congress & Exhibition
Authors Abstract
Content
Independent verification of the accuracy of data from Event Data Recorders (EDRs) is useful when using the information to help reconstruct a crash. To this end, the accuracy of the EDR function of the Airbag Control Module (ACM) was tested on 2010 and 2011 Toyota Camry sedans during straight line operation. During steady state operation, and maximum ABS-braking runs starting from approximately 80 km/h (50 mph), and 113 km/h (70 mph), non-deployment events were artificially induced to store event data. Following each run, the EDR was imaged using the Bosch Crash Data Retrieval (CDR) system. The CDR reported speed values were compared to Racelogic VBox differential GPS speed records. Data recorders were also used to monitor the vehicle Controller Area Network (CAN) bus traffic, including the indicated speed, brake pressure, engine RPM, and accelerator pedal position. The speed and RPM reporting algorithms stated in CDR Data Limitations were confirmed. Exemplar graphs of EDR-reported speed/brake/RPM/accel pedal data versus GPS speed and CAN bus data are presented and discussed. The timing of the reported data with respect to the event is also discussed. The difference between vehicle speed recorded by the EDR and the GPS speed during steady state operation varied from +0.4 to −2.3 km/h, with the EDR typically reporting lower than the GPS. During heavy braking the difference in speed was observed to be from −7 to +15 km/h, with wheel slip causing negative differences, and time delay since the last CAN bus update causing positive differences.
Meta TagsDetails
DOI
https://doi.org/10.4271/2012-01-0999
Pages
15
Citation
Ruth, R., Bartlett, W., and Daily, J., "Accuracy of Event Data in the 2010 and 2011 Toyota Camry During Steady State and Braking Conditions," SAE Int. J. Passeng. Cars - Electron. Electr. Syst. 5(1):358-372, 2012, https://doi.org/10.4271/2012-01-0999.
Additional Details
Publisher
Published
Apr 16, 2012
Product Code
2012-01-0999
Content Type
Journal Article
Language
English