Lean burn

It means running the engine with low fuel (lean burning). This is an engine technology that is difficult to realize, although it has the advantage of improving fuel efficiency because it operates with less fuel. With this technology, exhaust gas conditions are lean, i.e., an condition with excces oxygen, so it is difficult to extract oxygen from NOx. On the other hand, in a rich = fuel-rich condition (such as during rich burn), it becomes easier to extract oxygen from NOx. The NSR catalyst can adsorb NOx in a lean condition, and extract oxygen from NOx when it becomes rich.

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