ADAC test: ‘new diesel cars meet NOx standards’
As a result of dieselgate, the laboratory exhaust gas values of new vehicles must be verified by measurements under real road traffic conditions. German federation of independent mobility clubs, ADAC, has conducted its own tests with 26 diesel and petrol cars. It found out most of them apply largely with the standards set for NOx.
ADAC test with 26 cars
“According to the tests made by ADAC in real driving conditions on the road, nitrogen oxide emissions from current cars are well below the established limits. They are even better than what the transitional European regulations require”, says Christophe Dubon, spokesman of Febiac, the Belgian automotive industry federation. ADAC recently tested 26 cars (diesel and petrol) under real road driving conditions with a portable PEMS measurement system.
Since 1 September 2017 for the Euro 6d-Temp standard and from 1 January 2020 for the Euro 6d, the laboratory exhaust gas values of new vehicle types must be verified by measurements under real traffic conditions.
The goal is to detect cheating devices, like the ones which led to dieselgate. During these tests the NOx limit value for a Euro 6d-Temp diesel is set at 168 mg/km. At a later point it will be lowered to 114 mg/km. For gasoline, it is 126 mg/km and eventually 86 mg/km.
Well below the standard
Of the thirteen diesel models tested, 11 are well below 80 mg, with near-floor values for the BMW 520d Touring, Mercedes C220d or Opel Astra 1.6D. The Citroën Berlingo Blue HDI 130 is barely higher, as are the Audi A8 50 TDI, Kia Ceed 1.6 CRDI and Volkswagen Golf 1.6 TDI SCRv.
“Only the Honda Civic 1.6I-DTEC flirts with the 100 mg but this vehicle still complies with legal regulations”, stresses Christophe Dubon of Febiac.
Petrol cars are even cleaner
For the thirteen petrol cars tested, all are well below 50 mg. The least polluting are the Hyundai i20 1.0T-GDI, Suzuki Ignis 1.2 and VW Golf 1.5 TSI BM DSG. The Renault Mégane TCe 140 emits more NOx but the gap with the other cars is very small.