Since the exhaust gas contains almost no combustible substances, this leads to a decrease in the temperature in the combustion chamber and thus to a decrease in the NOx content.
This system is used in certain modifications of the Audi car.
Unregulated catalyst
Thanks to an unregulated catalyst, it is possible to reduce the content of harmful substances in exhaust gases by up to 65%.
Regulated catalyst
The regulated catalyst deactivates about 90% of harmful substances. It is not the catalyst itself that is regulated, but the air-fuel mixture. This ensures optimum performance of the catalyst. The composition of the mixture is determined by the lambda probe depending on the composition of the exhaust gases. His work is described in more detail below.
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