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).
METHOD FOR CONTROLLING THE SPARK LEAD OF AN INTERNAL COMBUSTION ENGINE / N. Cavina; G. Po; L. Poggio. - (2007).
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.