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TECHNICAL REQUIREMENTS FOR EDRs: Adjustment proposals from INDUSTRY

 

 

1-       “Driver seat belt status” was omitted in our element table (identical to “Passenger seat belt status”)

 

Note – Secretary has already updated master working document to correct this omission.

 

 

 

2-       “Ignition cycle / crash” / “Ignition cycle / download” (Mandatory elements; 0 to 60.000)

 

2.1 5 . " Ignition cycle, crash " means the number (count) of vehicle power cycles applied to the recording device at the time when the crash event occurred since the first use of the EDR.

2.1 6 . " Ignition cycle download " means the number (count) of vehicle power cycles applied to the recording device at the time when the data was downloaded since the first use of the EDR

 

The main interpretation of ignition cycle is key on/key off cycle, and that such a key on/key off cycle will lead to a complete reset of the ECU, and will start in the next key on from the scratch.

In case of an Airbag ECU a key on/key off cycle may not lead to such a reset as the AB ECU is powered by an Energy reserve.

It depends if the considered information is coming from the CAN-bus or is “interpreted” by the AB ECU.

In the case the information is “interpreted” by the AB ECU, some cases of key on/key off/key on (in short timeframe) will be interpreted by the ECU just like if no key on/key off/key on happened.

Moreover, if you place the unit on a bench and provide the unit power it will not increment the ignition cycle counter (applying and removing battery power to the module will not increment the ignition cycle counter).

Therefor the ECU power mode cycles may slightly differ from the key on/off (vehicle ignition) cycles.

It is important that each OEM can choose to consider one or the other (none is “wrong”), but can tell which of both.

We propose to resolve the concern by adding the word “mode” to the statement, as shown below.

Then a complete power mode cycle is from one state such as off to run back to off (“it can be the vehicle” / “it can be the ECU”)

Suggestion :

2.15. “Ignition cycle, crash" means the number (count) of power mode cycles vehicle power cycles applied to the recording device at the time when the crash event occurred since the first use of the EDR.

2.16. "Ignition cycle download" means the number (count) of power mode cycles vehicle power cycles applied to the recording device at the time when the data was downloaded since the first use of the EDR.

 

 

 

 

3-       “Data capture”

 

5.3 . " The EDR shall record the captured data in the vehicle and this data shall remain in the vehicle subject to the provisions of paragraph 5.3.4, until they are retrieved in compliance with…”

Crash data must be available at least until the data is retrieved, and the authorization, or ban, of deleting AFTER retrieval can remain open to the choice of each OEM or each country.

Suggestion :

5.3. " The EDR shall record the captured data in the vehicle and this data shall remain in the vehicle subject to the provisions of paragraph 5.3.4, at least until they are retrieved in compliance with…”

and

5.3.2. Conditions for triggering locking of data

In the circumstances provided below, the memory for the event shall be locked to prevent any future overwriting of the data.

In the case the data can be deleted after retrieval, it is essential to permit this deletion in the § 5.3.2. , but to keep the ban of any overwriting by other data from a subsequent event .

Suggestion :

5.3.2. " In the circumstances provided below, the memory for the event shall be locked to prevent any future overwriting of the data by subsequent event .