Condensation protection AECD for an internal combustion engine employing cooled EGR

The present invention relates generally to systems for controlling exhaust emissions produced by an internal combustion engine, and more specifically to such systems including an auxiliary emission control device for accommodating control of condensation effects resulting from cooled EGR. A system for protecting an internal combustion engine employing cooled recirculated exhaust gas (EGR) from excessive condensation includes an auxiliary emission control device (AECD) operable to determine when engine operating conditions correspond to a condensing condition resulting in condensation of water at the outlet of the EGR cooler and/or within the intake manifold or intake conduit of the engine. When such conditions occur, the AECD is operable to close the EGR valve and monitor engine operating conditions. When engine operating conditions no longer correspond to the condensing condition, control of the EGR valve is restored to an air handling system associated with the engine.