| 摘要 |
An engine including an exhaust system operable to convey exhaust gases from the engine. A turbocharger is in fluid communication with the exhaust system. A diesel particulate filter, disposed in fluid communication with the exhaust system and located in downstream relation to the turbocharger, operates to substantially remove particulate matter from within the exhaust gases. An exhaust gas recirculation passage, disposed in upstream relation from the turbocharger and diesel particulate filter, operates to communicate a portion of the exhaust gases to an air-to-air heat exchanger, which operates to cool the portion of the exhaust gases. An exhaust gas recirculation valve operates to selectively and variably communicate the portion of the exhaust gases to an inlet air duct of an intake system. An engine cover defines an opening operable to communicate ambient air to the air-to-air heat exchanger to promote the cooling of the portion of the exhaust gases.
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