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VW Fiasco Puts Ethics In Engineering Under the Spotlight, CEO Steps Down
szczys writes: By now you've heard that VW has been accused of doctoring the software in their small diesel models to sidestep emissions standards. The thing that hasn't been talked about is engineering ethics. An algorithm in the code detects when the vehicle is under test conditions and causes it to perform differently. This couldn't have been accomplished by just one person. Brian Benchoff looks at the conditions leading up to the scandal and discusses the engineering ethics involved. Automotive engineers are held to a higher standard because mistakes and cut corners can kill people. This kind of suspected deceit goes well beyond concerns of environmental damage. Willing ethics violations challenge our trust of the engineering as a whole. Volkswagen‘s chief executive Martin Winterkorn has announced he is stepping down.
To be more specific: N2 + O2 is thermodynamically favorable at lower temperatures and pressures, while NOx is more favorable at higher temperatures and pressures. Combustion of fuel is also more efficient at higher temperatures and pressures. So pretty much whatever you do to get more power and efficiency out of your fuel, also tends to give you more NOx. Now, there's a wide range of things you can do to try to reduce the NOx; the ones with few drawbacks are pretty much universally done, while the others (such as urea injection) come at a cost. But the easiest way to reduce NOx for emissions tests is simply to burn cooler, at lower pressures, for shorter periods of time - aka, hurt your power and fuel economy.
Crowd: What do we want? Fry: Fry's dog! Crowd: When do we want it? Fry: Fry's dog!
I sincerely don't think Germans think that way. These are the people who turned off all their nuclear plants for solar. I disagree with that action, but I have a lot of trouble believing that they think that the regulations of the US, of all places, are ridiculous. Germans are not known for their dislike of regulations.
More likely, some engineers either were directed to do that, and preferred to not undermine their company, or they saw it as a challenge which they are proud of because they figured out how to beat emissions tests reliably.
Not condoning the cheating, but there is another issue. Many Americans drive, as their family vehicle as well as work vehicle, "light" trucks (e.g. Dodge RAM 3500) and SUVs which have much larger Diesel engines in them than the ones being discussed in these VW cars.
What I've been told about the structure of the EPA regulations is that driving a much more polluting large Diesel pickup truck as your personal vehicle is allowed, but driving a relatively much more efficient and less polluting small European Diesel vehicle is not allowed.
Something is seriously messed up there.
Where are we going and why are we in a handbasket?
It doesn't actually work that way, i.e. the EPA doesn't tell the car that it's being tested now. What happens, though, is that the tests are under carefully controlled conditions in the interests of reproducibility. The car is placed on a chassis dynamometer and run at a constant speed. VW programmed their engine computer to look for a combination of constant speed and zero steering input, which would never happen during normal driving, and switched into low emissions mode when it detected that combination.
There's no point in questioning authority if you aren't going to listen to the answers.
Bull. There are only a handful of diesel SUV models sold in the US, and their sales are extremely low. Diesel engines are more popular in extremely heavy-duty trucks, but still not very popular, and those aren't viable "family vehicle(s)", and very rarely used as commuter vehicles, at all.
It only makes sense for heavy vehicles to have more powerful engines. You need that power to tow trailers and other large cargo... things a little car is NEVER going to do, however polluting the engine might be. Why don't you go complain that those 16-wheel semi-trucks are allowed to pollute more than small cars, too? It doesn't make sense.
And NOBODY is going to buy a huge pickup, because they couldn't get a tiny diesel car... It's not a competition at all. Gasoline cars pollute far less. So much so that Europe is developing huge smog problems, with those famous landmarks covered in soot. Paris even banned pre-2011 diesel vehicles to deal with the problem.
http://www.bloomberg.com/news/...
Frankly, this is the death-knell for diesel power small-cars in the US. It puts the lie to the claims of their advantages, that most people were doubting without evidence, even while their other unremarked problems have been made undeniably obvious. No question in hindsight that Europe made the wrong decision promoting diesel over gasoline, and now it looks like they're bound to continue declining in popularity there, too.
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WVU which ran the tests which detected the cheating VW cars also tested a diesel BMW X5. The X5 passed.
The larger diesel trucks use a urea injection system to reduce NOx emissions. The larger size of the truck makes it easier to add the system, and the truck's higher price means the system makes a smaller (relative) increase to the vehicle's purchase price. The brouhaha over VW's EA189 engine was that it (purportedly) complied with NOx emission regulations without the added cost and complexity of a urea injection system. That would've been wonderful if true, but alas it wasn't.