Haven't read anything from a journalist on this issue that has illuminated much factual detail so far. The reality according to ICCT papers linked earlier in this thread is that nearly all diesels emit more NOX in real world tests.
NOx control technologies for Euro 6 diesel passenger cars | International Council on Clean Transportation[Press release] New ICCT study shows real-world exhaust emissions from modern diesel cars seven times higher than EU, US regulatory limits | International Council on Clean Transportation
The latest ICCT paper on euro6 models shows Hyundai, Renault and Volvo at 6-14x and the VW was exemplary.
Nobody has reported on the effect of low cetane US fuel on worse NOX emissions performance. Nobody has reported on the problems with WVU research rig (resistance equivalent to about 3m of extra exhaust pipe) that measured the headline 35x figure. Would be nice to see some research comparing the output of a bad test rig to a good test rig on a real vehicle.
Of course there is no question that specific code which detects the emissions test cycle and uses a different engine map for that is unconscionable. (There is still no factual account of the code in question.) The fact that most car diesels have issues with worse NOX performance in a real world test suggests they are all playing on the edge of legal. Corporations do many things bordering on unethical which are nevertheless legal (just) - profit-shifting to avoid tax is something that many people using family trusts as well as multinational corporations using different countries do. Not apologising for anyone but that is the world we live in.
Bookmarks