METHOD FOR DEFINING CYLINDER TORQUE DEMAND DURING TRANSITIONS IN SKIP-FIRE ENGINE OPERATION

A method for defining cylinder torque demand during transitions in skip-fire engine operation of a combustion engine having a number N of cylinders, the method comprising: firing the engine in first cycles of a first pattern of N events, that defines for each cylinder of the engine a fire or skip fire event in one cycle of the first cycles, with a first fuel quantity for each fire event in the first cycle; transitioning the engine to firing the engine in second cycles of a second pattern of N events of fire and skip fire events for each cylinder, with a second fuel quantity for each fire event in the second cycle; carrying out one or more transitioning fire events, in transitioning from the first to the second pattern, with a dynamic fuel quantity, to compensate for torque loss of a preceding or succeeding skip fire event of said fire event, wherein the adjustment differs from the first and/or second fuel quantity.