NOx emission control for a controlled auto-ignition four-stroke internal combustion engine
A four-stroke internal combustion engine is operated in controlled auto-ignition mode by any of a variety of valve control strategies conducive to controlled auto-ignition conditions in conjunction with in-cylinder fuel charges that are at either stoichiometric or lean of stoichiometric air-fuel ratios. A measure of engine NOx emission is provided and when it crosses a predetermined threshold, the in-cylinder fuel charge is transitioned from the operative one of the stoichiometric or lean of stoichiometric air-fuel ratios to the inoperative one of the stoichiometric or lean of stoichiometric air-fuel ratios.
GM Global Technology Operations, Inc.
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James A. Jun-Mo Barry L. Tang-Wei Paul M. Chen-Fang
Eng Kang Brown Kuo Najt Chang