Method of HCCI and SI combustion control for a direct injection internal combustion engine
The present invention relates to methods for robust controlled auto-ignition and spark ignited combustion controls in gasoline direct-injection engines, including transients, using either exhaust re-breathing or a combination of exhaust re-compression and re-breathing valve strategy. These methods are capable of enabling engine operation with either lean of stoichiometric or stoichiometric air/fuel ratio for oxides of nitrogen (NOx) control, with varying exhaust gas recirculation (EGR) rates and throttle valve positions for knock control, and with a combination of homogeneous charge compression ignition (HCCI) and spark ignition (SI) combustion modes to optimize fuel economy over a wide range of engine operating conditions.
GM Global Technology Operations, Inc.
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Jun-Mo Zongxuan Man-Feng James A. Barry L. Chen-Fang Paul M. Tang-Wei
Kang Sun Chang Eng Brown Chang Najt Kuo