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Experimental Tools for the Design Homologation of Egr Coolers
Technical Paper
2004-05-0369
Sector:
Language:
English
Abstract
EGR-cooler is a crucial component inside the whole EGR system in
diesel engines with the aim of accomplishing pollutant emissions
policies. EGR-coolers are recent components in vehicle
manufacturing industry that need homologation to test their
reliability. An EGR- cooler is a gas-liquid cooler that decreases
exhaust gas temperature through heat transfer to the refrigeration
liquid. So, the processes in which EGR-cooler is involved impose
very rigorous design and homologation requirements.
In this paper, different homologation tests and tools for
EGR-cooler out-of-engine are presented regarding different critical
aspects of this component. In this way, there are presented
different types of tests: Fatigue tests, including thermal ones,
pressure inside the cooler and vibrations, which consists of
hardening working conditions; requirement evaluation tests, which
are efficiency and pressure drops, linked with the needs that the
component should accomplish. There are also presented special
features tests, for example, bubbles, where the coolant behavior
inside the cooler are analyzed; and corrosion, where the problem of
hot corrosion due to the acids contained in the exhaust gases is
studied.
Different testing facilities have been developed to accomplish
the different tests proposed, being these facilities presented with
their capabilities. There are also presented different experimental
results of the different tests.
Finally, a methodology to homologate this type of components is
proposed.