초록 ▼

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 t

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.

대표청구항 ▼

The invention claimed is: 1. 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 cylin

The invention claimed is: 1. 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. 2. The method of claim 1, wherein monitoring combustion in each of the cylinders further comprises measuring in-cylinder pressure, and determining a state for cylinder mean-effective-pressure therefrom. 3. The method of claim 1, further comprising: calculating an average of the states of the combustion parameter for the cylinders; and detecting one of a partial burn and a misfire in one of the cylinders when the determined state for the combustion parameter for one of the cylinders varies from the average of the states of the combustion parameter by an amount greater than a threshold. 4. The method of claim 1, further comprising: determining a plurality of states for the combustion parameter for each cylinder during successive firing events based upon the monitored combustion in each of the cylinders; calculating a deviation for the states of the combustion parameter for each cylinder; determining a maximum deviation for all of the cylinders; and, disabling the fuel correction when the maximum deviation for all the cylinders exceeds a threshold. 5. The method of claim 4, further comprising disabling the fuel correction when the maximum deviation for all the cylinders exceeds a threshold for a predetermined number of firing events. 6. The method of claim 1, wherein selectively enabling fuel correction comprises enabling an algorithm to correct fueling rate to one of the cylinders to stabilize combustion while operating in the auto-ignition mode. 7. The method of claim 6, wherein the algorithm to correct fueling rate to one of the cylinders to stabilize combustion while operating in the auto-ignition mode comprises: determining engine combustion phasing for each of the cylinders based upon the monitored combustion in each of the cylinders; globally adapting fuel injector pulsewidths based upon engine intake mass air flow and an exhaust air/fuel ratio; and, selectively adjusting individual fuel injector pulsewidths to achieve combustion with minimum misfires and partial burns. 8. 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. 9. The method of claim 8, wherein selectively enabling individual cylinder fuel correction when either one of a partial burn and a misfire in one of the cylinders has been detected based upon the monitored combustion further comprises: determining a state for mean-effective pressure for each of the cylinders during each firing event; calculating an average of the states of the mean-effective pressure for the cylinders; detecting one of a partial burn and a misfire in one of the cylinders when the determined state for the mean-effective pressure for one of the cylinders varies from the average of the states for the mean-effective pressure by an amount greater than a threshold. 10. The method of claim 8, further comprising: determining a plurality of states for the mean-effective pressure for each of the cylinders during successive firing events; calculating a deviation for the states of the mean-effective pressure for each of the cylinders; determining a maximum deviation in the mean-effective pressure for all of the cylinders; disabling the fuel correction when the maximum deviation in the mean-effective pressure for all the cylinders exceeds a threshold; and, disabling the fuel correction when the maximum deviation mean-effective pressure for all the cylinders exceeds a threshold for a predetermined number of firing events. 11. The method of claim 8, wherein selectively enabling fuel correction comprises enabling an algorithm to correct fueling rate to one of the cylinders to stabilize combustion in the engine while operating in the auto-ignition mode. 12. The method of claim 11, wherein the algorithm to correct fueling rate to one of the cylinders to stabilize combustion in the engine while operating in the auto-ignition mode comprises: determining engine combustion phasing for each of the cylinders based upon the mean-effective pressure in each of the cylinders; globally adapting fuel injector pulsewidths based upon engine intake mass air flow and an exhaust air/fuel ratio; and, selectively adjusting individual fuel injector pulsewidths to achieve stable combustion with minimum misfires and partial burns. 13. 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. 14. The method of claim 13, wherein selectively enabling fuel correction 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 parameter further comprises: determining a state for the combustion parameter for each of the cylinders during each firing event; calculating an average of the states of the combustion parameter for the cylinders; detecting one of a partial burn and a misfire of a cylinder charge in one of the cylinders when the determined state for the combustion parameter for one of the cylinders varies from the average of the states for the combustion parameter by an amount greater than a threshold. 15. The method of claim 14, further comprising: determining a plurality of states for the combustion parameter for each of the cylinders during successive firing events based upon the monitored combustion in each of the cylinders; calculating a deviation for the states of the combustion parameter for each of the cylinders; determining a maximum deviation for all of the cylinders; disabling the fuel correction when the maximum deviation for all the cylinders exceeds a threshold; and, disabling the fuel correction when the maximum deviation for all the cylinders exceeds a threshold for a predetermined number of firing events. 16. The method of claim 15, wherein selectively enabling fuel correction comprises enabling an algorithm to correct fueling rate to one of the cylinders to stabilize combustion in the engine while operating in the auto-ignition mode. 17. The method of claim 16, wherein the algorithm to correct fueling rate to one of the cylinders to stabilize combustion in the engine while operating in the auto-ignition mode comprises: determining engine combustion phasing for each of the cylinders based upon the monitored combustion in each of the cylinders; globally adapting fuel injector pulsewidths based upon engine intake mass air flow and an exhaust air/fuel ratio; and, selectively adjusting individual fuel injector pulsewidths to achieve combustion with minimum misfires and partial burns. 18. The method of claim 17, wherein monitoring combustion in each of the cylinders comprises measuring in-cylinder pressure, and determining a state for cylinder mean-effective-pressure therefrom.