Ignition apparatus
AssigneeMitsubishi Electric Corporation
InventorNaoki KATAOKA
Life of this patent
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Abstract
There is provided an ignition apparatus that performs optimum energy control by suppressing a secondary current at a time when the ignition plug is consumed, while maintaining the simplicity, the small size, and the low cost and while securing the flammability. The ignition apparatus is provided with a first switching circuit that turns on or off energization from a power source to a primary coil, a secondary coil that is magnetically coupled with the primary coil and supplies a secondary current to an ignition plug, and a controller that decreases the secondary current for a spark discharge by use of an energy-changeable circuit, when determining that the ignition plug has been consumed, based on an output of a plug-consumption detection circuit.
Claims7
An ignition apparatus comprising:
- an ignition coil having a primary coil and a secondary coil that is magnetically coupled with the primary coil and supplies a secondary current to an ignition plug;
- a first switching circuit that turns on or off energization from a power source to the primary coil;
- an energy-changeable circuit that can change magnitude of the secondary current;
- a plug-consumption detection circuit that detects that the ignition plug has been consumed;
- and
- a controller that performs on/off-control of the first switching circuit so that the secondary current is generated in the secondary coil by a change in magnetic flux generated in the primary coil and a spark discharge is produced in the ignition plug and that decreases the secondary current by use of the energy-changeable circuit, when determining that the ignition plug has been consumed, based on an output of the plug-consumption detection circuit.
Dependencies are inferred from the claim text.