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EGR System with Dedicated EGR Cylinders

Abstract: 

Improved exhaust gas recirculation system and methods that use one or more of the engine's cylinders as dedicated EGR cylinders. All of the exhaust from the dedicated EGR cylinders is recirculated back to the engine intake. Thus, the EGR rate is constant, but the EGR mass flow may be controlled by adjusting the air-fuel ratio of the dedicated EGR cylinders or by using various variable valve timing techniques.

Patent Number: 
8,291,891
Date Of Issue: 
10/23/2012
Inventors: 

Terrence Francis Alger II; Barrett Wade Mangold; Jess Witman Gingrich; Darius Mehta