This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
“The Accuracy of Speed Captured by Commercial Vehicle Event Data Recorders”
Technical Paper
2004-01-1199
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Many newer commercial vehicles have an event data recorder (EDR) that can record pre-event and post-event speeds. The EDR is incorporated into the engines electronic control module (ECM). In this study, the accuracy of the ECM-reported speed was tested during acceleration, gear shifting and braking at speeds between 16 and 88 km/h (10 to 55mph). The ECM-reported speed was compared to the speed measured by a calibrated optical 5th wheel. The results showed that the accuracy of the ECM-reported speed matched closely during acceleration, cycled to periods of under-reporting the speed during hard braking due to the ABS brake function, briefly under-reporting the speed after letting off the throttle for braking or gear shift and briefly over-reporting the speed near the end of a gear shift phase. This study also looked at calibration factors of the ECM and their effect on the ECM-reported speed. Information downloaded from an ECM after an accident event can be used in conjunction with conventional methods of accident reconstruction to evaluate the event. The downloaded information can expand the analysis of time, distance and speed because the ECM data covers a time duration of up to 105 seconds prior to the event and up to 30 seconds after the event. Current published research has only addressed the accuracy of event data recorders in passenger vehicles.
Recommended Content
Authors
Citation
Reust, T., "“The Accuracy of Speed Captured by Commercial Vehicle Event Data Recorders”," SAE Technical Paper 2004-01-1199, 2004, https://doi.org/10.4271/2004-01-1199.Also In
References
- Lawrence JM Wilkinson CC Heinrichs BE Siegmund GP. “The accuracy of pre-crash speed captured by event data recorders” Warrendale, PA Society of Automotive Engineers 2003
- SAE J1025 Recommended Practice Warrendale, PA Society of Automotive Engineers
- Detroit Diesel Corporation “Extracting and Analyzing Data from Electronic Control Modules and ProDriver” 2002
- Detroit Diesel Corporation “DDEC IV, Application and Installation” 1999
- Reust TJ. “Commercial Vehicle Event Data Recorders” ARC-CSI Crash Conference 2003 Las Vegas, NV