By 2021 the emission standards became more restricted. Since 2015, the regulation od Euro 6 emission standard flowed but now. The new 6d-ISC-FCM standard has applied for all new vehicles since January. Anyway, Audi has passed all standard tests on its 193 models’ adaption new technology and accurizing the software’s and ECU’s.
Euro 6 emission standard make it clear that the limit value for nitrogen oxides of 80 milligrams per kilometer (128.7 mg/mi) has applied for cars with a diesel engine and also for the cars with gasoline, 60 milligrams per kilometer (96.9 mg/mi). but by the new rules of Euro 6d, is applied to all type of vehicles and has a direct relationship with Real Driving Emissions (RDE). That means, the vehicles must now comply with the limits even during these RDE tests, which are carried out on the road under defined conditions. Also, the car must have an on-board fuel consumption monitoring system, which Audi has already updated on its ECUs.
Audi tested its cars at in Ingolstadt and Neckarsulm in the best way possible and nearly it will test more models too. To keep the cars under the new Euro 6d standard, Audi tried hard to keep emission under the line in all conditions. So, the Twin-dosing technology is born for all diesel models for inline four-cylinder and V6 engines. Also, this technology was being used for compact models with traverse-mounted diesel engines and the six-cylinder models in the midsize range during 2020. We see this type of engines in Audi A3, A4, A5 and Q5.
What was considered on the gasoline engines, is the carbon particles that are produced primarily in the event of a cold start. From 2018 to now Audi used the gasoline particulate filters on gasoline models which reduces the particulate emissions to about 90 percent.