Method and apparatus for enabling control of fuel injection for an engine operating in an auto-ignition mode
AssigneeGM Global Technology Operations LLC
InventorsOguz H. Dagci, Jun-Mo Kang
Life of this patent
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Abstract
There is provided a method and a control scheme to control an internal combustion engine operating in an auto-ignition mode by selectively activating a control scheme for controlling fuel injector operation based upon engine combustion parameters, e.g., IMEP or NMEP. The method comprises operating the engine in the auto-ignition combustion mode, and monitoring combustion in each of the cylinders. The fuel correction is selectively enabled only when either one of a partial burn and a misfire of a cylinder charge in one of the cylinders has been detected.
Claims18
Method for operating a multi-cylinder internal combustion engine selectively operative in one of a spark-ignition mode and an auto-ignition mode, the method comprising:
- operating the engine in the auto-ignition combustion mode;
- monitoring combustion in each of the cylinders comprising
- measuring combustion during each firing event, and
- determining a state for a combustion parameter for each of the firing events therefrom;
- and
- selectively enabling fuel correction to the cylinders only when either one of a partial burn and a misfire of a cylinder charge in one of the cylinders has been detected based upon the monitored combustion.
Method for controlling a multi-cylinder internal combustion engine operating in an auto-ignition mode, the method comprising:
- measuring in-cylinder pressure in each of the cylinders, and determining a state for cylinder mean-effective-pressure therefrom for each firing event;
- calculating an average state for the cylinder mean-effective-pressure for all the cylinders for each firing event;
- detecting one of a partial burn and a misfire in one of the cylinders when the cylinder mean-effective-pressure for one of the cylinders varies from the average state for the cylinder mean-effective-pressure by an amount greater than a threshold;
- and,
- selectively enabling individual cylinder fuel correction when either one of a partial burn and a misfire of a cylinder charge in one of the cylinders has been detected.
Method for controlling a multi-cylinder internal combustion engine selectively operative in one of a spark-ignition mode and an auto-ignition mode, the method comprising:
- monitoring an operator torque request;
- selectively operating the engine in the auto-ignition mode based upon engine operating conditions and the operator torque request;
- monitoring combustion in each of the cylinders, and, determining a state for a combustion parameter therefrom for each firing event;
- calculating an average state for the combustion parameter for all of the cylinders for each firing event;
- detecting one of a partial burn and a misfire when the combustion parameter of one of the cylinders varies from the average state for the combustion parameter by an amount greater than a threshold;
- selectively enabling fuel correction when either one of a partial burn and a misfire of a cylinder charge in one of the cylinders has been detected, and;
- selectively deactivating the fuel correction when either one of a partial burn and a misfire occurs in all the cylinders.
Dependencies are inferred from the claim text.