Heat exchanger method and apparatus for engine exhaust gas recirculation system

An exhaust gas recirculation system for an internal combustion engine configured to operate lean of stoichiometry, comprising:

• the exhaust gas recirculation system configured as a high-pressure loop system including a conduit fluidly connected to a downpipe of the engine upstream of a turbine section of a turbocharger and comprising:
• particulate filter device fluidly coupled to a heat exchanger fluidly coupled to an intake system of the engine downstream of a compressor section of the turbocharger, the particulate filter device configured to
• filter particulate matter in the exhaust gas feedstream utilizing a filter substrate, and
• continuously regenerate the filter substrate utilizing an oxidation catalyst coated on the filter substrate, the oxidation catalyst enabling the particulate matter to continuously oxidize at lower exhaust gas feedstream temperatures;
• a hydrocarbon trap device fluidly coupled to the particulate filter device, the hydrocarbon trap configured to
• trap unburned hydrocarbons within the exhaust gas feedstream, and
• oxidize the unburned hydrocarbons utilizing a substrate coated on the hydrocarbon trap device;
• the heat exchanger configured to reduce temperature of a portion of an exhaust gas feedstream that is recirculated to the intake system of the engine, and
• the hydrocarbon trap device and the particulate filter device located upstream of the heat exchanger and fluidly coupled to said conduit fluidly connected to the downpipe of the engine to reduce mass flowrate of particulate matter and hydrocarbons borne in the recirculated portion of the exhaust gas feedstream and to reduce deposition of particulate matter and hydrocarbons onto and adhesion to surface areas of the heat exchanger.