Patent ID: 6883508

Claim:
A method for controlling a primary current in an ignition coil of an internal combustion engine with controlled ignition, in which the current is established in an inductive primary circuit over a given duration, referred to as the conduction time and determined by calculation and/or as a function of measurements carried out in the primary circuit, characterized in that the conduction time is calculated according to the following steps: predetermining the predetermined conduction time (td i ), carrying out at least one measurement of the current (Ic i ) in the primary circuit at an instant (t i ) lying in the last tenth of the predetermined conduction time (td i ) but before the end of the predetermined conduction time, estimating the current (If i ) only at the end of the predetermined conduction time (td i ), as a function of the measurement or measurements carried out during said last tenth, optimally correcting the conduction time (td i ) for the ignition cycle during which the last current measurement was carried out, as a function of the previous estimate and the current (I target i ) desired at the end of the conduction time.