Quote:
Originally Posted by msmiljanic
I am wondering why we don't stick to what the manual says - EDR data is recorded by your vehicle only if a nontrivial crash situation occurs - I don't think the language can get more clear(only if a nontrivial crash situation occurs). It doesn't say continuous recording. It doesn't say recording when a fault occurs. But you seem to be making statements that are contradictory - why? Do you know something that demonstrates that the manual is wrong?
Manual Text
This vehicle is equipped with an event data re‐ corder EDR. The main purpose of an EDR is to record, in certain crash or near crash-like situa‐ tions, such as an air bag deployment or hitting a road obstacle, data that will assist in under‐ standing how a vehicle's systems performed. The EDR is designed to record data related to vehicle dynamics and safety systems for a short period of time, typically 30 seconds or less.
The EDR in this vehicle is designed to record such data as:
▷ How various systems in your vehicle were operating.
▷ Whether or not the driver and passenger safety belts were fastened.
▷ How far, if at all, the driver was depressing the accelerator and/or brake pedal.
▷ How fast the vehicle was traveling.
This data can help provide a better under‐ standing of the circumstances in which crashes and injuries occur.
EDR data is recorded by your vehicle only if a nontrivial crash situation occurs; no data is re‐ corded by the EDR under normal driving condi‐ tions and no personal data, for instance name, gender, age, and crash location, are recorded.
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How will the EDR record data prior to the crash if it is not continuously recording?
Obviously, an Internet post so not sure how accurate it is. Well all are information from the Internet
https://f80.bimmerpost.com/forums/sh...8&postcount=15
• PRE-CRASH DATA -1 Sec
o Ignition Cycle, Crash (cycle)
o Safety Belt Status, Driver
o Safety Belt Status, Front Passenger
o Air Bag Warning Lamp (On,Off)
o Air Bag Suppression Switch Status, Front Passenger
o Seat Track Position Switch Status, Driver
o Seat Track Position Switch Status, Foremost, Front Passenger
o Occupant Size Classification, Front Passenger (Child)
• PRE-CRASH DATA -5 to 0 Sec
o Speed, Vehicle Indicated (MPH)
o Accelerator Pedal, % Full (%)
o Engine RPM
o Steering Input (deg)
o Service Brake, On/Off
o ABS Activity (Engaged, Non-engaged)
o Stability Control (On Engaged, Non-engaged)
This one is from back in 2014, so yes it is old...
https://www.edmunds.com/car-technolo...rash-data.html
Put everything the devices do in an owner's guide and "instead of one paragraph, you'd have potentially another 20 or 30 pages. That really wouldn't be realistic," says Richard Ruth, a black box equipment trainer, expert witness and consultant who worked at Ford Motor Co. for 33 years, including a stint evaluating event data recorders and other safety equipment. "It's not going to change whether or not you're going to buy the car
Most event data recorders are programmed to record data in a continuous loop, writing over information again and again until a vehicle is in a front-end collision or other crash. When an accident occurs, the device automatically saves up to 5 seconds of data from immediately before, during and after an incident.
The mandate did, however, provide a minimum standard for the type of data that EDRs would be required to record: at least 15 types of crash data. Some of the required crash data include pre-crash speed, engine throttle, brake use, measured changes in forward velocity (Delta-V), driver safety belt use, airbag warning lamp status and airbag deployment times.
https://en.wikipedia.org/wiki/Event_data_recorder
In addition to the required data, NHTSA also set standards for 30 other types of data if EDRs were voluntarily configured to record them. For example, if a manufacturer configured an EDR to record engine RPMs or ABS activity, then the EDR would have to record 5 seconds of those pre-crash data in half-second increments.
http://www.crashdataservices.net/Vehicles.html
Today, most General Motors EDRs record 2 ½ or 5 seconds of pre crash data. General Motors EDRs can also record data in deployment (airbag) or non-deployment (no airbag) crashes.
Ford EDRs were installed, they were often capable of recording about 20 seconds of pre-crash data, as well as 5 seconds of post-crash data, giving reconstruction experts a clear illustration of how the vehicle was being
operated before, during and after a crash sequence.