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Dual Path (Low Pressure Loop and High Pressure Loop) EGR for Improved Air Boosting Efficiency

Abstract: 

A method of providing exhaust gas recirculation (EGR) to an air-boosted internal combustion engine. The engine has both a high pressure EGR loop and a low pressure EGR loop. Each EGR loop has a valve that controls the amount of EGR that is delivered to the engine intake from that loop. During low-speed engine conditions, more EGR is delivered to the engine intake from the low pressure EGR loop than from the high pressure EGR loop. During high-speed engine conditions, more EGR is delivered to the engine intake from the high pressure EGR loop than from the low pressure EGR loop.

Patent Number: 
9,309,804
Date Of Issue: 
04/12/2016
Inventors: 

Christopher J. Chadwell; Terrence F. Alger II; Shinhyuk Joo