End of diesel? Fuel could be doomed as German cities ban paves way for Europe.
How the Diesel’s NOx Problem got worse!
The issues with diesel lately are fundamentally the result of one problem: diesel engines emit large quantities of NOx (oxides of nitrogen), pollutants that cause serious respiratory health problems in those exposed to them that range from mild to fatal.In Europe, mandates requiring large reductions in diesel NOx emissions were first implemented in 2009 under the Euro 5 regulations. These mandates have been further tightened under the Euro 6 regulations, set to take full effect in 2020.For years, manufacturers that make diesels have invested heavily in solving a different problem that has been forced by inconsistent and badly advised Governments: meeting CO2 emissions reductions also required of them by regulations. But public officialdom’s more recent shift to a focus on NOx emissions, combined with a new, more demanding regimen called the Real Driving Emissions test (RDE), has pretty much forced manufacturers to comply while still delivering the price and vehicle performance their customers demand. The belief of Governments and scientists was that this diesel problem was intractable.
Technology and consultation was always the way forward however the Environmentalists and their bullied pray (the UK Government) wanted fast changes.Whether the diesel car is dead depends on not only solving NOx emissions, but whether the industry can be believed that the problem can be solved. In fact, from purely a technical standpoint, diesel’s NOx problem may indeed already have been solved. There has been some breakthrough announcements just over the past year:
• Bosch, the global engineering and electronics firm that makes auto engine parts and systems, announced that through the low-cost combination of a turbocharger optimized for RDE conditions, a repositioning of the engine exhaust system and other mechanisms aimed at maintaining exhaust temperatures, they have been able to reduce NOx emissions under RDE test conditions well below the 2020 Euro 6 requirement.
• Researchers at the Universities of St. Andrews and Newcastle announced that they have developed an emissions catalyst material that is capable of converting carbon monoxide and NOx in diesel exhaust streams into harmless compounds.
• Researchers at Loughborough University announced they’d developed a low-cost system that dramatically improves the currently widespread NOx-reducing AdBlue technology, reducing NOx emissions reductions by up to 98%.
• Engineers at German car parts maker Continental announced their development of a device that improves the efficiency of catalytic converters by heating them electrically. When installed in a VW Golf, the device reportedly reduced NOx emissions by 60% under RDE test conditions.
A number of Manufactures who still remain committed to diesel have begun to install advanced, proprietary NOx-suppressing systems of their own in cars that are already in production. The big news is that, according to Which? a UK version of the US’s Consumer Reports, some of them outperform the tough Euro 6 standard under RDE conditions.
In its latest report, Which? revealed that of the 61 diesel cars it tested, most did, in fact, fail to comply with the Euro 6d maximum of 80 milligrams of NOx emissions per kilometre. But it also found that 14 of them satisfied the RDE requirement. Of those 14 vehicles, nine of them – including vehicles from Vauxhall, Peugeot, BMW and Mercedes-Benz – beat the NOx limit by 46%, while the cleanest-running vehicle among them, the BMW 2 Series 218d Active Tourer, beat it by 83%, generating only 14 milligrams of NOx per kilometre.
Clearly, affordable, clean-running diesel vehicles are possible, as OEMs and researchers have been claiming, even if the technology that makes this possible hasn’t yet been widely implemented. If diesel is dead, the reason isn’t going to be insoluble NOx emissions problems.
The breakthroughs even prompted Volkswagen CEO Matthias Mueller to predict that diesel ‘will see a renaissance in the not-too-distant future’ although with VW’s emissiongate history perhaps we will take a rain check on that comment.
So what is the world outlook for Diesel?
In the light of evidence to date, hearing our UK Government Ministers banning diesel engines in cars appears to have been premature. If the diesel passenger vehicle does die, it’s clear that the reason won’t be that diesel can’t be made clean enough. It would be sad to say it’s because of our knee jerking Government to keep the ‘Environmemtalists’.
In diesel’s favour is the fact that it gets better fuel economy and emits less CO2 than gasoline/petrol and even less than many hybrids, and so is likely to remain an important part of European manufacturer’s strategy for achieving emissions targets.
Whether and for how long demand for diesels remains strong enough to keep them in production, though, is difficult to answer. Much will hang on public perception — and Dieselgate from the UK Government and our politically led TV media organisations like BBC News, Sky News and ITN has without a doubt done considerable damage to diesel’s public image. It remains to be seen whether manufacturers can regain the trust of Euro officialdom as well as the public’s. But again a poorly advised Government rules!
* All vehicle images and car descriptions on this site are for illustration and reference purposes only and are not necessarily an accurate representation of the vehicle on offer.
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