A method of controlling the spark lead (AA) of an internal combustion engine having at least one cylinder fitted with a spark plug; the method including the steps of: determining a standard spark lead (AA) value; determining an engine knock index (Ikn) in the cylinder; calculating a correction factor (Cf) to the standard spark lead (AA) value; and controlling the spark plug using the modified spark lead (AA) value. The correction factor (Cf) is calculated by statistically analyzing a number of engine knock indexes (Ikn) to calculate a cumulative distribution; comparing the cumulative distribution with at least one target value (Ptarget); and modifying the current correction factor (Cf) value as a function of the comparison between the cumulative distribution and the target value (Ptarget).
N. Cavina, G. Po, L. Poggio (2007). METHOD FOR CONTROLLING THE SPARK LEAD OF AN INTERNAL COMBUSTION ENGINE.
METHOD FOR CONTROLLING THE SPARK LEAD OF AN INTERNAL COMBUSTION ENGINE
CAVINA, NICOLO';
2007
Abstract
A method of controlling the spark lead (AA) of an internal combustion engine having at least one cylinder fitted with a spark plug; the method including the steps of: determining a standard spark lead (AA) value; determining an engine knock index (Ikn) in the cylinder; calculating a correction factor (Cf) to the standard spark lead (AA) value; and controlling the spark plug using the modified spark lead (AA) value. The correction factor (Cf) is calculated by statistically analyzing a number of engine knock indexes (Ikn) to calculate a cumulative distribution; comparing the cumulative distribution with at least one target value (Ptarget); and modifying the current correction factor (Cf) value as a function of the comparison between the cumulative distribution and the target value (Ptarget).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
