HCCI engine combustion control
AssigneeGM Global Technology Operations LLC
InventorJun-Mo Kang
Life of this patent
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Abstract
An exemplary method of controlling a gasoline engine operating unthrottled with homogeneous charge compression ignition (HCCI) combustion includes operating the engine with predetermined values of external EGR and internal EGR settings, and burned gas fraction set points for intake and exhaust gases. Repeated adjustments are made to the external EGR and internal EGR settings to move the exhaust and intake gases burned gas fractions toward their state set points. Effects of disturbances in actual operating conditions are thereby minimized.
Claims20
Method of controlling an internal combustion engine operating unthrottled with HCCI combustion, the method comprising:
- operating the engine with a predetermined external EGR setting;
- providing a desired burned gas fraction set point for intake gases;
- repeatedly determining burned gas fraction values of the intake gases and calculating differences from the corresponding desired burned gas fraction set point for intake gases;
- and
- repeatedly applying adjustments to the external EGR setting to move the burned gas fraction values of the intake gases toward the desired burned gas fraction set point for intake gases.
Method of controlling an internal combustion engine operating unthrottled with HCCI combustion, the method comprising:
- operating the engine with a predetermined internal EGR setting;
- providing a desired burned gas fraction set point for exhaust gases;
- repeatedly determining burned gas fraction values of the exhaust gases and calculating differences from the desired burned gas fraction set point for exhaust gases;
- and
- repeatedly applying adjustments to the internal EGR setting to move the burned gas fraction values of the exhaust gases toward the desired burned gas fraction set point for exhaust gases.
Control for an internal combustion engine operating unthrottled with HCCI combustion, the method comprising:
- an open loop control providing external EGR and internal EGR settings;
- and
- a closed loop control providing desired burned gas fraction set points for intake and exhaust gases and adjustments to external EGR and internal EGR settings based on differences between actual burned gas fractions of intake gases and exhaust gases and the desired burned gas fraction set points.
Method of controlling an internal combustion engine operating unthrottled with HCCI combustion, the method comprising:
- operating the engine with predetermined external EGR and internal EGR settings;
- providing desired burned gas fraction set points for intake and exhaust gases;
- repeatedly determining current burned gas fraction values of the intake and exhaust gases and calculating differences from the corresponding desired burned gas fraction set points;
- and
- repeatedly applying adjustments to the external EGR and internal EGR settings to move the burned gas fraction values of the intake and exhaust gases toward their corresponding set points.
Dependencies are inferred from the claim text.