Patent ID: 6990951
Filing Date: 2006-01-31
Classification: F02D

Abstract:
1. A method of operating a compression ignition engine to accomplish lean-rich modulation of fueling, the method comprising: processing certain data to modulate fueling between lean modulation and rich modulation; during lean modulation, processing data representing a particular set of operating conditions to select a particular lean fueling map that comprises fueling data appropriate to the particular set of operating conditions for causing the engine to be fueled in a manner that causes the engine to run lean and develop a corresponding torque; and during rich modulation, processing data representing substantially the same particular set of operating conditions to select a particular rich fueling map that comprises fueling data appropriate to that substantially same particular set of operating conditions for causing the engine to be fueled in a manner that causes the engine to run rich and develop substantially the same corresponding torque as during lean modulation.