Patent ID: 8132407
Filing Date: 2012-03-13
Classification: F02M

Abstract:
1. A method of cooling an exhaust recirculation gas flow with a plurality of exhaust cooler modules each having a cooler portion and a bypass portion, the method comprising: routing a portion of an exhaust gas flow in a region of an engine exhaust gas passage being located in an engine exhaust gas flow path between an engine exhaust manifold and an exhaust side of a turbocharger into an exhaust gas recirculation passage; routing some of the exhaust gas in the gas recirculation passage through each one of the plurality of exhaust gas cooler modules, the plurality of cooler modules being disposed in the exhaust gas recirculation passage and arranged in series in the exhaust gas recirculation passage such that all fluid flowing through the exhaust gas recirculation passage flows through every cooler module inlets of the plurality of exhaust gas cooler modules being in communication with the first region of the engine exhaust selectively removing heat from the exhaust gas flow flowing through the exhaust gas recirculation passage with at least two of the plurality of exhaust gas cooler modules disposed in the exhaust gas recirculation passage and through which the exhaust gas flows; and selectively supplying exhaust gas from the exhaust recirculation passage to an air intake passage.