EGR Rate for Tier III Compliance

Approximate Exhaust Gas Recirculation rate required to reduce engine-out NOx to Tier III limit without urea.

EmissionsEGR

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This calculator requires JavaScript to compute its result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

\text{EGR}\% \approx 35 \cdot \sqrt{1 - \text{NO}_x^\text{target} / \text{NO}_x^\text{base}}

Symbol	Meaning	Unit
$\text{NO}_x^\text{base}$	Engine-out NOx at 0 % EGR	g/kWh
$\text{NO}_x^\text{target}$	Tier III limit	g/kWh

Source: MAN ES - EGR Technical Paper

Approximate Exhaust Gas Recirculation rate required to reduce engine-out NOx to Tier III limit without urea.