Published: Jan 2009
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Chapter 1 sets the introduction, objectives, and background for ASTM Monograph 5. Black box data from accident vehicles, methods for retrieval, translation, and interpretation.
This chapter introduces the concept of devices known as event data recorders (EDRs). EDRs can exist as a stand alone function, independently accumulating data from dedicated sensors, or they can be more global, accumulating data from parameters broadcast on a vehicle network (data bus). EDR-like subfunctions can be incorporated into the operation of other system devices such as antilock braking controllers, stability controllers, etc., and modern vehicles can often have more than one device functioning as an EDR (e.g., restraints controller, stability controller, and engine controller). EDR data, normally thought of as crash event related, can also be associated with the diagnostic trouble code (DTC) freeze frames.
The feasibility of having EDR data is made possible by the incorporation of nonvolatile electronic memory in the vehicle functional control device. Nonvolatile memory data are usually retrieved from any particular EDR via a serial data interface: however direct nonvolatile memory access is certainly feasible and used in certain circumstances. Notwithstanding where it resides, and how it is retrieved, the nonvolatile data often have meaning when describing vehicle physical actions when its translation and interpretation is stated in common engineering units. The balance of Monograph 5 discusses methods of translation and interpretation of that data.
nonvolatile data, EDR, EDR data, EDR data translation