5.4.5 EGR Cooling and Intercooling
A minimum charge air temperature before the intake valves is
advantageous for several reasons. On the one hand, charge air
density that increases as the temperature drops produces
efficient cylinder charging. This is called thermal engine
dethrottling. As a consequence, the EGR compatibility
increases and NOX and PM emissions can be lowered further.
In addition, thermal dethrottling produces a consumption
advantage through the air/fuel ratio. This underscores the
positive influence of EGR and intercooling on an engine’s
thermodynamic performance
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