Patent ID: 8375926

Claim:
An exhaust gas recirculation (EGR) system for an air breathing, fuel-consuming, turbocharged internal combustion (IC) engine producing a work output with products of combustion, said system comprising: a conduit for delivering intake air from the turbocharger to the IC engine for combustion; a heat exchanger interposed in said intake air conduit for cooling air delivered to the IC engine; an EGR conduit for receiving a controlled portion of the products of combustion from the IC engine and selectively introducing the products of combustion into the intake air conduit; at least one heat exchanger interposed in said EGR conduit for reducing the temperature of products of combustion passing to the intake air conduit wherein the intake air heat exchanger and said at least one EGR heat exchanger are contiguous with one another; a first valve responsive to a signal for bypassing flow around said at least one heat exchanger during predetermined engine conditions; and a second valve responsive to said bypass flow condition for delivering air from a point upstream of said intake air cooler to said at least one heat exchanger for purging moisture from said heat exchanger, wherein said second valve permits flow only from the point upstream of said intake air cooler to said at least one EGR cooler.