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Internal Combustion Engine Having Dedicated EGR Cylinder(s) with Split Fuel Injection Timing

Abstract: 

A method of controlling fuel injection to the cylinders of an internal combustion engine, the engine having exhaust gas recirculation (EGR) from at least one dedicated EGR (D-EGR) cylinder, with the other cylinders being main cylinders. The D-EGR cylinder is run at a richer equivalence ratio than the main cylinders, with the goal of providing increased H2 and CO in the recirculated exhaust. The rich limit of the D-EGR cylinder is maximized by dividing the fuel injection into multiple fuel injection events, with each fuel injection event occurring during the intake valve lift period of the engine cycle. 

Patent Number: 
9,845,747
Date Of Issue: 
12/19/2017
Inventors: 

Bradley D. Denton; Raphael Gukelberger; Christopher J. Chadwell