Thursday, 2. May 2019
Andy Eastlake, managing director of the Low Carbon Vehicle Partnership (LowCVP), says the “overriding aim” must be to accelerate the drive to “truly, low pollution vehicles” and to rapidly increase the number of zero emission miles driven.
However, he told Fleet News: “While combustion fuels still predominate, we need to use all the tools in the box to deliver lower CO2 and cleaner air, and the efficiency of diesel engines should be captured where possible.
“The latest diesels must, and with RDE2 can now be shown to, deliver emissions as low as petrol.”
Indeed, tests conducted by German automobile club ADAC on some of the latest models, not officially classified as RDE2, suggest they are as clean as their petrol counterparts.
The conformity factor for RDE2 gives an actual on-the-road limit of 114mg/km for diesel and 86mg/km for petrol.
Nearly all the cars tested by ADAC emitted less than 50mg/km
The Volkswagen Golf 1.6 TDI SCR performed exactly the same as its petrol counterpart, emitting 14mg/km of NOx.
ADAC performed the tests using a portable emissions measurement device (PEMS), in the same way as the official test.
Erik Jonnaert, secretary general of the ACEA, the European trade association for carmakers, believes modern diesel cars can play a strong role in helping cities move towards compliance with air quality targets.
“It is important we stop demonising diesel technology as a whole,” he said. “Instead, we need to differentiate between the old diesel fleet and the latest generation of vehicles.”
The second stage of Real Driving Emissions testing (RDE2) calls for no more than 114 mg/km of nitrogen oxides (NOx) over a wide envelope of real-world driving conditions. This requires an impressive clean emissions performance from diesel vehicles. But should we trust the system this time?
We can be more confident now, yes. RDE2 is very similar to what has been in place in the USA for more than 10 years. The US test is easier, but the limit is lower and the engineering task overall is similar.
RDE2 vehicles are typically delivering emissions in the 20-40mg/km range on the Emissions Analytics’ test cycle, compared with the average of pre-RDE diesels in Europe of around 400mg/km. So, at least an order of magnitude reduction.
Further, the imminent introduction of in-service conformity testing, which can be carried out by third parties, will make it risky to cheat, meaning confidence in RDE2 results should be higher.
Good though they are, these RDE2 vehicles will not be enough to solve urban air quality problems.
Why? At the same time as these RDE2 vehicles are on sale, for the next six months there will still be new diesels available legally emitting 400mg/km and more – all labelled Euro 6.
As Euro 6 has been in place since 2014, the number of pre-RDE Euro 6 diesels on the road will dwarf the number of RDE2 vehicles for years to come. Even some of the early RDE1 vehicles skate close to the emissions limit and will never be subject to in-service conformity testing.
Action is needed on these pre-RDE vehicles to solve urban air quality and rebuild trust in diesel technology – whether or not that is wanted by policymakers. It may prove necessary to meet climate change goals.
Making the regulations for future vehicles ever harder is burdening manufacturers – and ultimately buyers – with unnecessary cost, when the more efficient solution is to address the dirty Euro 6s already on the road. To enable this, genuinely independent ratings are required to compare vehicles of all types and ages, not just piecemeal self-certification by manufacturers. In that way, more targeted and efficient procurement and city access policies can be set.
Rebuilding trust and evidencing the low emissions of their current vehicles are key reasons why Jaguar Land Rover submitted a range of its latest diesel vehicles to the independent AIR Index test (www.airindex.com). These are ratings based on the new European standard methodology CWA17379 and conducted for the independent AIR Alliance (www.allowAIR.org).
The ratings apply to vehicles of any age and are controlled by neither governments nor manufacturers so, for once, the results, can truly be trusted. By Graham Hill (Thanks To Fleet News)
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