Ignition apparatus of internal combustion engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorDaiki Fukuda
Life of this patent
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Abstract
In an ignition apparatus, voltage is induced in a primary coil by a permanent magnet being rotated together with rotation of an output shaft of an engine. As the output shaft rotates, protrusions also revolve, inducing voltage in an electromagnetic pickup. Depending on the induced voltage in the pickup, a switching element is switched on or off. The switching-off timing of the switching element is set as an ignition timing. Therefore, at the ignition timing, the current through the primary coil is sharply cut off, so that great voltage is induced in a secondary coil and is applied to an ignition plug.
Claims6
An ignition apparatus of an internal combustion engine, comprising:
- a generator that has a primary coil and a secondary coil that generates an induced voltage in the secondary coil by using an induced current that flows through the primary coil based on rotation of an output shaft of the internal combustion engine;
- means for generating the induced voltage in the secondary coil by discontinuing the induced current and for applying the induced voltage to an ignition plug of the internal combustion engine;
- two semiconductor switching elements connected to the opposite ends of the primary coil, each of the semiconductor switching elements controlling one of discontinuation and conduction of a current through the primary coil;
- and
- element drive signal generation means for generating a signal that switches each of the semiconductor switching elements on and off based on the rotation of the output shaft,
- the element drive signal generation means generating an element drive signal so that each of the semiconductor switching elements switches from an on-state to an off-state at a timing at which ignition of the ignition plug is to be performed.
An ignition apparatus of an internal combustion engine, comprising:
- a generator that has a primary coil and a secondary coil that generates an induced voltage in the secondary coil by using an induced current that flows through the primary coil based on rotation of an output shaft of the internal combustion engine;
- means for generating the induced voltage in the secondary coil by discontinuing the induced current and for applying the induced voltage to an ignition plug of the internal combustion engine;
- two semiconductor switching elements connected to the opposite ends of the primary coil, each of the semiconductor switching elements controlling one of discontinuation and conduction of a current through the primary coil;
- element switching-on signal generation means for generating a signal that switches each of the semiconductor switching elements on based on the induced current through the primary coil, and
- element switching-off signal generation means for generating a signal that switches each of the semiconductor switching elements off based on the rotation of the output shaft,
- the element switching-on signal generation means and the element switching-off signal generation means generating an element drive signal so that each of the semiconductor switching elements switches from an on-state to an off-state at a timing at which ignition of the ignition plug is to be performed.
Dependencies are inferred from the claim text.