Intressant:
http://blog.caranddriver.com/how-volksw ... standards/Citat:
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Enlisting the help of West Virginia University’s Center for Alternative Fuels, Engines, and Emissions (CAFEE) to assist with the real-world testing, it seemed the data would soon reveal the root of the inconsistencies. But when the results gathered via real-world testing were compared with the compliant numbers generated in the lab by the California Air Resources Board (CARB), it was clear something wasn’t kosher in dieselburg.
To shed some additional light on the situation, C/D spoke with Daniel Carder, interim director of CAFEE, and Dr. Arvind Thiruvengadam, research assistant professor of CAFEE. Both were participants in the testing sessions where the discrepancies were first discovered, and they replied candidly.
Armed with several of its Portable Emissions Measurement Systems (PEMS), CAFEE hit the road in a number of VW diesels—as well as a diesel BMW X5, according to a report in Bloomberg—to compile some real-world road-test emissions numbers for comparison with the CARB numbers, which fell fully within the accepted levels of NOx emissions. Before long, it was obvious that something was terribly wrong: The Jetta exceeded the U.S. nitrogen-oxide emissions standard by 15 to 35 times, and the Passat by 5 to 20 times. The X5 passed.
According to Thiruvengadam, when the teams began comparing data, their first response was, “That’s not right,” and they immediately started accusing each other of forgetting a crucial procedure or step that could have corrupted the data. Only after double- and triple-checking their work for accuracy did they begin to look to the vehicles for an explanation. “We were amazed,” he says. “The engine software had to be responsible.” Carder added: “When a car is working nicely in the field but the NOx emissions findings increase by a factor of 15 to 35 times over the CARB testing results, it’s clear that there are some software strategies at work.”
“Developing an engine software to optimize certain aspects of an operation cycle that you know the parameters of is a challenge, but it is very possible,” says Thiruvengadam. “Knowing when to switch to the EPA-favorable cycle is the trick; it could be set up to detect the absence of steering-wheel movement, or, and this is known, we often turn off the traction control for testing purposes.” Either way, the result is the same: it turns the emissions controls on for EPA testing and off for real-world driving. Somewhat ironically, the presumed benefits of turning off the controls for normal driving include improved fuel economy and engine power.
Dessutom undersöks nu om VAG bilar inom EU berörs
http://www.svt.se/nyheter/ekonomi/bilfu ... -i-sverigeCitat:
Elva miljoner bilar världen över av märket Volkswagen bär på mjukvara som fuskar med bilens avgasmätning. Avslöjandet kommer att stå den tyska biltillverkaren dyrt, och oron sprider sig på den globala marknaden. I Sverige lovar Volvo att deras bilar inte är påverkade – medan Volkswagens svenska gren vägrar kommentera
Med lite tur kan det bli slutet för dieselboomen.