Laboratory Experiments Using Event Data Recorder and Additional Data from CAN Bus 2019-01-0635
An experimental campaign based on the harness and Event Data Recorder (EDR) of a production vehicle (Toyota Auris 2007) was setup for laboratory experiments. The experiments involved triggering minor events in the EDR by hitting the Airbag Control Module (ACM) with a pendulum style impactor with different pendulum weight, initial angle, front and rear. The ACM was hit in three different conditions: ACM fixed, ACM free to move and ACM flung towards impactor. The wheel speed sensors were emulated with the same 7/14 mA pulses such that the vehicle was simulated to be moving with a ramping up and down speed during the impact. This was done such that the EDR data has vehicle speed in both its pre and post crash data. The Bosch Crash Data Retrieval (CDR) tool was used to download the EDR data. Data from these experiments is shown and discussed.
Data from the CAN bus has been shown to be a very useful source of information [1, 2] from the OBD II port by requesting the specific PID's. More recent work on vehicle dynamics [3in print] has been able to utilize the large quantity of available data on the CAN bus in 'listing' mode, i.e. by overhearing messages on the BUS and deciphering the location and meaning of the CAN messages. A separate microntroller was utilized to filter and store the required CAN bus data in an SD card and later downloaded to PC. Such data provides additional information such as the four wheel speeds rather than just one vehicle speed available in the EDR data. Thus the additional data can provide more information of the EDR event (in the case of different wheel speeds would indicate loss of traction with ground or slip/skid).
1. Mario, Farrugia; Jean Paul, Azzopardi; Emilio, Xuereb; Carl, Caruana; Michael, Farrugia; "The Usefulness of Diesel Vehicle Onboard Diagnostics (OBD) Information", Mechatronika 2016, December 7 – 9, 2016, Prague, Czech Republic, IEEE Conference Publications, pp 369-373, ISBN: 978-80-01-05882-4.
2. Xuereb, Emilio; Farrugia, Mario; "Review and Validation of Models of Pressure Drop Across Diesel Particulate Filter and Particulate Loading Quantity", SAE International Powertrain Fuels and Lubricants Conference, Baltimore MA USA, 24-26 October 2016. SAE Paper 2016-01-2280, DOI: 10.4271/2016-01-2280.
3. Mark Anthony Azzopardi, Jean Paul Azzopardi, Mario Farrugia, Michael Farrugia, 'Vehicle Dynamics Analysis from a Production Vehicle’s CAN Bus Data Augmented with Additional IMU’s' Mechatronika 2018, 5-7 December 2018 Brno Czech Republic, IEEE conference, in-print.
Miguel Tabone, Jean Paul Azzopardi, Mario Farrugia, Michael Farrugia
University of Malta, Reata Engineering