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Volkswagen admitted in 2015 that it rigged nearly 600,000 diesel-powered cars sold in the U.S. to cheat on emissions tests
The company got in trouble in the 21st century when some of its diesel cars were discovered to have been designed to cheat on emissions tests.
The company got in trouble in the 21st century when some of its diesel cars were discovered to have been designed to cheat on emissions tests.
* VW’s “defeat device” is not a physical device but a programme in the engine software that lets the car perceive if it is being driven under test conditions - and only then pull out all the anti-pollution stops. “Clean diesel” engines cut emissions through techniques such as adjusting air-fuel ratios and exhaust flows, and in some (though not most VWs) injecting a urea-based solution to render NOx harmless. When running normally, requiring greater performance, VW’s controls would not operate in the same way. <ref>[https://www.theguardian.com/business/ng-interactive/2015/sep/23/volkswagen-emissions-scandal-explained-diesel-cars The Volkswagen emissions scandal explained] - ''The Guardian'', 23 September 2015</ref>
* VW’s “defeat device” is not a physical device but a programme in the engine software that lets the car perceive if it is being driven under test conditions - and only then pull out all the anti-pollution stops. “Clean diesel” engines cut emissions through techniques such as adjusting air-fuel ratios and exhaust flows, and in some (though not most VWs) injecting a urea-based solution to render NOx harmless. When running normally, requiring greater performance, VW’s controls would not operate in the same way. <ref>[https://www.theguardian.com/business/ng-interactive/2015/sep/23/volkswagen-emissions-scandal-explained-diesel-cars The Volkswagen emissions scandal explained] - ''The Guardian'', 23 September 2015</ref>
* Volkswagen admitted in 2015 that it rigged nearly 600,000 diesel-powered cars sold in the U.S. to cheat on emissions tests.<ref> [http://www.wsj.com/articles/fbi-arrests-volkswagen-executive-1483971808 FBI Arrests Volkswagen Executive in Emissions Scandal]</ref>
==References==
==References==