1-5 Event Data Recorder (EDR) System 47 1 Safety Data Element Meaning Purpose stored in the ECU that records EDR data Time from event X-1 to X Elapsed time from time zero of event X-1 to time zero of event X, if two events occur- red within five seconds To analyze the time interval between the occurrence of two events Hardware number of the ECU that records EDR data ECU that serves as an EDR on a vehicle To verify the information of the ECU that records EDR data Serial number of the ECU that records EDR data ECU that serves as an EDR on a vehicle To verify the information of the ECU that records EDR data Software number of the ECU that records EDR data ECU that serves as an EDR on a vehicle To verify the information of the ECU that records EDR data Clipping identification Time when (lateral and longi- tudinal) acceleration collected by the EDR first reaches the measuring range of sensors To ensure the time accuracy of EDR recording Longitudinal accelera- tion Component of the vector acceleration of a point in the vehicle in the x-direction To analyze the longitudinal acceleration at the time when the crash event occurred Lateral acceleration Component of the vector acceleration of a point in the vehicle in the y-direction To analyze the lateral accel- eration at the time when the crash event occurred Delta-V, lateral Change in lateral vehicle velocity, which only represents the component of the resultant delta-V in the y-direction To analyze the lateral delta-V at the time when the crash event occurred Maximum delta-V, later- al Maximum value of the cumula- tive change in velocity, as recorded by the EDR, of the vehicle along the y axis, which should be used in combination with “time, maximum delta-V, lateral” To analyze the maximum lateral delta-V at the time when the crash event occur- red