Patent ID: 11891972
Assignee: DENSO CORPORATION
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  H | IPC F  H

Claim 10:
11. An ignition device for an internal combustion engine comprising:
an ignition plug;
a primary coil that includes a predetermined winding;
a secondary coil configured to be magnetically linked to the primary coil and be connected to the ignition plug;
a main ignition circuit configured to supply and interrupt a current through the primary coil to accordingly cause a spark discharge to occur in the ignition plug;
an energy supply circuit configured to supply and stop electrical energy to the predetermined winding of the primary coil to accordingly cause the spark discharge to continue;
a recirculation circuit configured to permit and prohibit current recirculation through a recirculation path including the predetermined winding; and
a controller configured to:
control the main ignition circuit,
start a permission of the current recirculation by the recirculation circuit after when the current through the primary coil is interrupted by the main ignition circuit, and
set an end time of the permission of the current recirculation to be before the main ignition circuit starts the supply of a current through the primary coil next time.