Exhaust gas recirculation system

In an exhaust gas recirculation system for an engine having an intake manifold, an exhaust manifold, an exhaust gas recirculation conduit, an exhaust gas recirculation cooler, an exhaust gas recirculation valve, and an exhaust gas recirculation driver, an improvement to said exhaust gas recirculation system comprising:

• an exhaust gas recirculation bypass conduit in flow communication with said exhaust gas recirculation conduit at a first location upstream of said exhaust gas recirculation driver and a second location downstream of said exhaust gas recirculation driver;
• and
• an exhaust gas recirculation bypass valve disposed along said exhaust gas recirculation bypass conduit for controlling flow through said exhaust gas recirculation bypass conduit.

A method of controlling an exhaust gas recirculation system of an internal combustion engine having an intake manifold, an exhaust manifold, an exhaust gas recirculation conduit, an exhaust gas recirculation valve, and an exhaust gas recirculation driver, said method comprising the steps of:

• directing a flow of exhaust gas through said exhaust gas recirculation conduit and said exhaust gas recirculation driver at a first set of engine operating conditions when said exhaust gas is recirculated from said exhaust manifold to said intake manifold;
• and
• directing a bypass flow through an exhaust gas recirculation bypass conduit and said exhaust gas recirculation driver at a second set of engine operating conditions when said exhaust gas is not recirculating from said exhaust manifold to said intake manifold, said exhaust gas recirculation bypass conduit being disposed in flow communication with said exhaust gas recirculation conduit at a first location upstream of said exhaust gas recirculation driver and a second location downstream of said exhaust gas recirculation driver.