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COMBUSTION AIR COOLER DUCT COMPONENT

IP.com Disclosure Number: IPCOM000177103D
Publication Date: 2008-Dec-05
Document File: 4 page(s) / 257K

Publishing Venue

The IP.com Prior Art Database

Abstract

The present invention relates to a combustion air cooler duct component for an internal combustion engine, eg a diesel engine, having an exhaust gas recirculation, ESR, system, an exhaust gas cooler and a combustion air cooler being provided for providing a mixture of cooled exhaust gas and cooled fresh combustion air to be charged to the engine for the combustion.

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COMBUSTION AIR COOLER DUCT COMPONENT

BACKGROUND

Technical field

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The present invention relates to a combustion air cooler duct component for an in- ternal combustion engine, eg a diesel engine, having an exhaust gas recirculation, EGR, system, an exhaust gas cooler and a combustion air cooler being provided for providing a mixture of cooled exhaust gas and cooled fresh combustion air to be

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charged to the engine for the combustion in the engine.

Prior art

Systems of this kind are previously known and are used to meet, inter alia, emission

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levels according to Euro5 specifications.

In such a system a certain amount of exhaust gas is recirculated for combustion after cooling and mixed with fresh, cooled combustion air in a duct arrangement in asso- ciation with the two coolers, eg in the outlet duct of the combustion air cooler, said

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duct leading a mixture of cooled exhaust gas and cooled combustion air to the com- bustion portion of the engine.

Cooling of exhaust gases normally results in that a quite acid condensate will ap- pear, the lower the exhaust gas temperature, the more condensate. The condensate

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comprises various minerals, organic acids and condensed water, which together gives the resulting condensed liquid a pH value as low as down to about 1,6.

The combustion air cooler including the duct portion, in which said mixing takes place, is for several reasons, mainly for manufacturing reasons, substantially made

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of aluminium and, thus, has quite poor corrosion and erosion properties. The low pH and the soot content of the EGR condensate cause extensive corrosion and wear in the combustion air cooler arrangement, the material of the corrosion and the ero- sion being brought by the inlet air mixture into the engine and results in an in- creased content of aluminium oxide in the engine lubrication oil, which decreases

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the lubricating function of the oil. In the end holes may even appear in the combus- tion air cooler wall.

     DESCRIPTION OF PREFERRED EMBODIMENTS 40

According to the present invention a solution to the above identified problem is to apply a protective...