Event Data Recorder Performance During High Speed Yaw Testing Subsequent to a Simulated Tire Tread Separation Event 2019-01-0634

This paper presents event data from the Sensing and Diagnostic Module (SDM) from a 2004 Chevrolet Malibu during yaw testing and yaw testing with tread removed from tires at various locations on the vehicle. Speeds up to 60 mph were achieved. An electro-magnet based event initiation device was incorporated to the dynamic testing to simulate a low-severity non-deployment event that triggered the recording of pre-crash data by the SDM. The SDM data from the tests was imaged and compared to reference data from vehicle-mounted instrumentation recording speed, steering angle, yaw angle, wheel speeds, and other parameters. This testing simulates the loss of control phase subsequent to a tread separation. As shown in previous research, the rolling radius of a tire is changed as the tread belts are removed. This paper examines the dynamic effect of changes to rolling radius, as a result of a tread separation, and high side-slip angles as it pertains to the accuracy of EDR reported vehicle speed.