Apparatus and Method for Protecting Against Fouling of an Exhaust Gas Recirculation Valve
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United States of America Patent
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Issued Date -
Feb 24, 2011
app pub date -
Aug 24, 2009
filing date -
Aug 24, 2009
priority date (Note) -
Abandoned
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Abstract
This invention relates to a method for protecting an exhaust gas recirculation (EGR) valve from fouling due to hydrocarbon condensation at low EGR cooler outlet exhaust temperatures. In modern internal combustion engines exhaust gas recirculation (EGR) valves provide a means to recirculate exhaust gases into the intake air stream. The EGR valve regulates the flow of exhaust gas entering the stream. The EGR valve can experience fouling due to the condensation of hydrocarbons at low EGR cooler outlet exhaust temperatures. Typically, fouling occurs when the internal combustion engine is operating at relatively low temperatures, namely during low speed and/or low torque operations. The effects of fouling an EGR valve include higher emission levels, reduction in fuel economy, and rough idling.
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