Exhaust gas recirculation system for an internal combustion engine and method for operating same
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United States of America Patent
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Jan 24, 2017
Grant Date -
Mar 24, 2016
app pub date -
Sep 18, 2014
filing date -
Sep 18, 2014
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Abstract
An exhaust gas recirculation (EGR) system includes an EGR duct configured to effect fluid communication between an exhaust duct and an intake duct of an internal combustion engine; a heat exchanger having a first flow passage and a second flow passage, the first flow passage being in fluid communication with the EGR duct, the second flow passage being configured to receive a heat transfer medium from a heat transfer medium source; an upstream purge valve in fluid communication with the second flow passage of the heat exchanger, and configured to effect selective fluid communication between a purge fluid source and the second flow passage of the heat exchanger; and a controller operatively coupled to the upstream purge valve. The controller is configured to purge the second flow passage of the heat exchanger by opening the upstream purge valve.
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