US Patent No. 10,772,184

IGNITION DEVICE


Patent No. 10,772,184
Issue Date September 08, 2020
Title Ignition Device
Inventorship Daisuke Tanaka, Nisshin (JP)
Fumiaki Aoki, Nisshin (JP)
Akimitsu Sugiura, Kariya (JP)
Masashi Kando, Hamamatsu (JP)
Jan Husarik, Hamamatsu (JP)
Hiroshi Okajima, Tokyo (JP)
Assignee DENSO CORPORATION, Kariya (JP) PLASMA APPLICATIONS CO., LTD., Hamamatsu-s...

Claim of US Patent No. 10,772,184

1. An ignition device for igniting a mixture of air and fuel gas by plasma to generate an initial flame, comprising:a spark plug having an inner conductor, a cylindrical outer conductor that holds the inner conductor inside, and a dielectric provided between the inner conductor and the outer conductor, and the spark plug configured to emit an electromagnetic wave to a plasma formation space between the inner conductor and the outer conductor to generate a plasma;
an electromagnetic wave power supply that generates the electromagnetic wave and delivers an electromagnetic wave power to the spark plug; and
a power supply control unit that controls the electromagnetic wave power supply, wherein
the electromagnetic wave power supply is configured to generate high frequency power at a number of different frequencies,
the power supply control unit is configured to output at least one of the plurality of high frequency powers generated by the electromagnetic wave power supply as the electromagnetic wave power,
the electromagnetic wave power supply includes multiple oscillators that respectively generate high frequency power at a number of different frequencies, and
the electromagnetic wave power supply has a combiner configured to combine the high frequency power generated by the multiple oscillators, combines a plurality of the high, frequency powers in the combiner, and input it to the spark plug as the electromagnetic wave power.