The Internet of criminal things

Posted Oct 5, 2015 19:48 UTC (Mon) by bronson (subscriber, #4806)
In reply to: The Internet of criminal things by dlang
Parent article: The Internet of criminal things

> a valid optimization, even on the open road

No, if it increases NOx output 40X above the limit, it is obviously not a valid optimization. Did you mean something else?

The Internet of criminal things

Posted Oct 5, 2015 21:43 UTC (Mon) by dlang (guest, #313) [Link] (4 responses)

cars put out a lot more pollution on the open road driving at real speeds, climbing real hills than they do in the EPA simulated test.

They are going faster, carrying more weight, almost always driven with a heavier foot on the skinny-pedel, etc.

Go read up on what the test actually consists of and you will be horrified at how little resemblance it has to real-world driving.

The Internet of criminal things

Posted Oct 5, 2015 23:21 UTC (Mon) by bronson (subscriber, #4806) [Link] (3 responses)

Where did I say the test resembled real-world driving? And, what does it matter? My statement: if the VW is putting out 20-40X more NOx than it should over a particular driving profile, then that is simply not a valid optimization to make.

At first i thought your reply was saying: since real world driving doesn't match the test very closely, we should just chuck the test out the window and give up. But that's both defeatist and not in reply to anything I said... so I'm guessing I'm misinterpreting?

The Internet of criminal things

Posted Oct 5, 2015 23:24 UTC (Mon) by dlang (guest, #313) [Link] (2 responses)

I think we disagree that it's the same driving profile

The Internet of criminal things

Posted Oct 5, 2015 23:51 UTC (Mon) by bronson (subscriber, #4806) [Link] (1 responses)

I only know of one driving profile that we're talking about: the one the EPA tested and VW optimized. I'm not aware of any others that matter for this discussion...?

The Internet of criminal things

Posted Oct 6, 2015 20:46 UTC (Tue) by dlang (guest, #313) [Link]

the accusation by the EPA is that there are multiple profiles in the ECU and that the car detects that it's being tested by the EPA and switches to one that pollutes less than the ones that are used for normal driving.

The EPA test profile is very strict and not something that will exactly match any on-the-road test. It was people doing on-the-road emissions tests and looking at differences that raised the concerns and started the investigation.

how close the EPA dyno test is to the on-the-road test that showed issues is part of what ends up confusing the issue (see the samsung TV power consumption issue), it all depends on what the exact triggers are to change the fuel profiles are and what the justification and logic for them are.