Patent ID: 7028680

Claim:
A two stage mixing system for exhaust gas recirculation (EGR) in an internal combustion engine, comprising: a two stage mixing device; an intake air conduit connected to the two stage mixing device; a supply conduit connected to the two stage mixing device; an EGR conduit connected to the two stage mixing device; a mixing conduit connected to the intake air conduit and to the supply conduit, where the mixing conduit forms a mixing chamber; a plenum connected to the EGR conduit, where the plenum is disposed on the circumference of the mixing conduit, and where the plenum forms an annular cavity; and at least one cross conduit disposed across the mixing chamber, where each cross conduit is connected at both ends to the plenum; where the two stage mixing device generates a higher velocity region in intake air from the intake air conduit; where the two stage mixing device directs exhaust gases from the EGR conduit into the higher velocity region; where the two stage mixing device provides a combustion gas to the supply conduit.