The method involves measuring a current intensity (Ici) of an inductive circuit, in last tenth of a preset conduction time (tdi). Current intensity (Ifi) at the end of the time (tdi) is estimated based on the intensity (Ici). The time (tdi) is corrected fo...

A control circuit 130 carries out ON/OFF control of a primary current flowing in an ignition coil in response to an input ignition control signal. The control circuit 130 and an insulated-gate bipolar power transistor (IGBT) 110 are integrated on a monolit...

In an ignition apparatus (engine igniter) 1, when a spark-discharge duration time Tc calculated on the basis of operation conditions of an internal combustion engine has elapsed after generation of spark discharge by an ignition coil 13, an electricity-sup...