When the EGR rate is increased, the curve of the PM-NOX
trade-off for 800 bar injection pressure is clearly below the
trade-off for 600 bar. This effect is called enhanced EGR
compatibility. Since the energy of mixture formation is predominantly obtained from the injection spray, increasing the
EGR rate can reduce O2 more substantially without increasing PM emissions too much. However, these approaches are
subject to limits that are dependent on the combustion
system.
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