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naseeamFlag for United States of America asked on

When and why does embedded Electronic Control Unit(ECU) use default calibration values?

Typical embedded Electronic Control Unit(ECU) stores real calibration values and default calibration values in Non-Volatile Memory(NVM).

Let's say ECU is Steering Controller and it's primary function is Lane Keep Assist(LKA). It is mounted in a commercial truck.  It programs camera's real and default calibration values in NVM.

Mostly, real calibration values are used.  When and why are default calibration values used?

AutomotiveMath / Science* Physics

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8/22/2022 - Mon
Dave Baldwin

Probably before there are any 'real' calibration values so the unit can start operating.

>>  Probably before there are any 'real' calibration values so the unit can start operating.
That's correct but please allow  me clarify the question.  After both real and default calibration values are in place and system is operating with real calibration values, are there any events that drive the need to operate system with default values?   
Dave Baldwin

You can't know that without knowing the internal software in the machine.
Your help has saved me hundreds of hours of internet surfing.

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What typical (or better yet specific) calibration values are required by a typical LKA camera?  

It is realky difficult to do a practical analysis of a hypothetical system.  Not sure that it's useful from a pedagogical POV either.

Thanks, naseeam!