Patent ID: 7581533

Claim:
An exhaust gas recirculation system for an engine having an exhaust manifold and an intake manifold, comprising: a valve assembly including a valve housing and at least one valve member, the valve housing defining a first port and a second port and being operatively connectable to the engine such that the first port receives exhaust gas from the exhaust manifold and the second port is in fluid communication with the intake manifold; and a heat exchanger defining a first passageway and a second passageway; wherein the at least one valve member is selectively movable with respect to the valve housing to provide a first mode of operation in which exhaust gas from the inlet port flows to the outlet port without flowing through either of the first and second passageways of the heat exchanger, a second mode of operation in which exhaust gas from the inlet port flows through the first and second passageways in series to the outlet port, and a third mode of operation in which exhaust gas from the inlet port flows through the first and second passageways in parallel to the outlet port.