Nissan/Infiniti and Other Event Data Recorders

Nissan joined the Bosch CDR Toolkit group with version 6.0 of the software, released on August 3, 2012. I haven't yet seen a Bosch download from a Nissan vehicle, but a download I observed from an earlier Nissan (conducted by a factory representative) shows some interesting features. For the period from 100 milliseconds (ms) before impact to 300 ms after impact, the ACM records the values of acceleration and delta-v for longitudinal and lateral forces and reports those values in tables with 10 ms intervals. For the time span from seven seconds before impact to six seconds after impact, it records and reports vehicle speed, road speed, engine speed, throttle pedal position, steering angle (in one-degree increments), brake pedal switch state, and seat belt buckle state. It also includes a summary table showing the maximum values of acceleration and delta-v and a chart showing ignition cycles at the event and ignition cycles at the download. I was very impressed with the large collection of data, both in variety and in time span.

As many of you may know, current Federal regulations require that, as of the 2013 (or 2014) model year, all vehicles which have EDR capability associated with their airbag control modules are required to store a specified, minimum set of data points and are required to have that data be accessible by non-proprietary means. Toyota was the first of the Japanese manufacturers to work with Bosch on getting access to ACM data. Honda came next. Now we have Nissan and a variety of European manufacturers. The percentage of operating personal vehicles without Bosch CDR access continues to decrease. There are some manufacturers, such as Hyundai and Kia, which sell their own specific systems for accessing the crash data in their vehicles; I have seen the data obtained with the proprietary systems from Hyundai and Kia and have not been impressed with it.

Please call me anytime you wish to discuss car/light-truck EDR interrogations, vehicle accident reconstruction, or any of the other vehicle-related consulting services I offer. Thank you for reading my current feature.

Ralph Cunningham, Inc.

770.918.0973 fax 770.918.8076 cell 770.378.5568

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