At the recent Chaos Communication Congress in Hamburg two IT experts, Felix Domke and Daniel Lange (former Head of IT strategy at BMW) gave a talk on what exactly had happened with Volkswagen’s cheating of emissions tests.
The biggest issue of emissions tests is that they are always performed with some standard model, like the so-called NEDC (New European Driving Cycle). This model consists of a few pretty short acceleration-braking cycles and one long cycle with higher speed, which represent city and highway traffic respectively. In real life nobody drives like this, and definitely nobody drives exactly like this.
But for emissions measurement they use this very model, thus engineers at car companies can do tricks to improve measurement results. Why do they do it? Plain and simple: it’s way cheaper than to do real improvements. If an enterprise could do something in a cheaper way, it definitely would prefer this way to any other as the bottom line is important to company performance.
“Trickery on that tests is very common,” says Lange. “What tricks people are doing to drive down the emissions? For example they blow up the tires by 3 bars more than you could actually use them on the road. The bottom of the tire looks like this, so that means that you only have that very small portion of the tire that still touches the ground, your resistance gets reduced.”
“They put diesel into the oil, because diesel is lighter than the oil, so friction gets reduced. They take off the mirror on a passenger side, because that is not legally required to exist. So resistance gets away with it. They tape close all the openings of the vehicle. Obviously, when the wind goes over it, it goes much smoother once you have everything taped. All of these things are either Ok, or they kind of borderline grey area. And they do this. This is how actually emissions are tested.”
You can read the entire article at usblog.kaspersky.com