VW etc Emissions Video

[The1]

Quite interesting if you have an hour to watch

https://media.ccc.de/v/32c3-7331-the_ex ... ideo&t=709

[vlad01]

thanks for posting it up! really interesting.

[Holden202T]

yeah finally got to watch it ...... if what they are saying is correct then its a pretty cut and dry court case!, they knew it was wrong and still did it and thought they could do it without getting noticed!

I also didn't realise there was that much to a diesel system, somewhat different to the petrol stuff I'm used to!

[pman92]

I dare say there is as much to a modern common rail diesel as what there is a direct injection petrol if not more.
Diesel exhaust systems are pretty complicated. Lambda sensor, diesel oxidisation cat, particulate filter and associated differential pressure sensor (essentially a MAP sensor connected to the exhaust with hoses) and exhaust gas temp sensor/s, NOx storage catalysts, 8 wire NOx sensors, variable geometry turbos, EGR including cooler and cooler bypass valve, and then there's the SCR stuff eg AbBlue and a different one again Peugeot use to regenerate their DPF.

[Jayme]

and a bunch of those sensors serve no other purpose, than to make sure you havent disconnected the emissions gear or removed the DPF LOL.

[pman92]

Most of them have a purpose, differential pressure sensor to know when the DPF is full and it's time to regenerate, temp sensor to ensure the DPF gets hot enough to work but doesn't overheat and melt, NOx sensor to know when the NOx cat is saturated and it's time to regenerate that or inject the ad blue etc.
But they certainly are also there to let you know when something isn't right.

I'm all for it, as a mechanic diagnosing and repairing it keeps my job interesting, if it saves the environment that's just an added bonus. A lot of people right it all off as emission control bullsh*t and have no interest in any of it. So many mechanics I've worked with don't properly understand it and when there's a MIL light on related to it they don't know what to do.
There's one thing for sure, it's not going anywhere. If anything it's going to get more complicated, and there's going to be a bigger gap between people who embrace it and learn about it and can fix it and have a job, and the others who wish we were all still driving EH holdens with the fuel tank and crankcase vented to atmosphere and no sign of any emission control device.

I think most of its pretty reliable, except EGR which is the devil. Just today I replaced an EGR valve on a 5 year old VW with less than 80,000km. 5 hour job involving the removal of the subframe and DPF just to gain access.

The biggest downside I see is 30+ years from now when these cars are old and people are playing with them. I've learnt a lot and had a great time on my weekends fitting an 808 and EFI conversion and learning about tuning it etc to my '77 HZ. About the only thing I have to do to keep it legal is keep the charcoal canister. It will be a different story in the future when people have to make sure their car still meets Euro 5 emissions.

[vlad01]

What I don't get is what was was the motive of all of this cheating if indeed that was how the ECU tuning was set up?

Its purely just for exhaust emission control post engine from what I understand. So what benefit was there to VW or the consumer? using a bit less adblue?

Surely you would want to use the correct and greater amount, only means more revenue from sales of adblue.

[pman92]

There's more too it than just the ad blue, I think that's just part of the story

From http://blog.caranddriver.com/everything ... s-scandal/
"In the test mode, the cars are fully compliant with all federal emissions levels. But when driving normally, the computer switches to a separate mode—significantly changing the fuel pressure, injection timing, exhaust-gas recirculation, and, in models with AdBlue, the amount of urea fluid sprayed into the exhaust. "

My understanding is they made them run for more power and fuel efficiency, which sells cars.
The side effect is massive amounts of NOx (massive compared to what they were meant to be emitting, probably not massive compared to any normal diesel 10 or 15 year older).
The side effect of the extra NOx is the adblue usage, they probably used the alternative adblue model because if they were going to really get rid of NOx with it they would use so much the customer would be constantly getting a warning light saying they have ran out of adblue, which wouldn't sell cars.

Not all cars effected had adblue. I doubt any sold in Australia had it.

[Holden202T]

My understanding is they made them run for more power and fuel efficiency, which sells cars.

theres your motive right there!

[vlad01]

fair point.