2021 Audi SQ5 Sportback Twin Dosing

https://www.youtube.com/watch?v=kggkIO4EgpI


Twin dosing of the aqueous AdBlue urea solution is particularly effective. It takes advantage of the different conditions in various areas of the exhaust system to enhance the effectiveness of the total system, adjusted to diverse operating conditions. In this way, Audi manages to convert more than 90 percent of the nitrogen oxides across a wide temperature and operating range. Thus, twin dosing decisively contributes to meeting NOx emission limits. If the vehicle is driven in high-load conditions for a longer period of time, such as on expressways or while towing a trailer, exhaust gas temperatures in the SDPF close to the engine significantly increase, resulting in a decline of nitrogen oxide conversion rates. This provides the stage for the second injection of AdBlue upstream of the second active SCR catalyst, which is located significantly further downstream in the vehicle’s underfloor on a lower temperature level. This enables the total system to achieve high conversion rates across a wide range.

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