公开(公告)号：US11129268B2

公开(公告)日：2021-09-21

申请号：US15914101

申请日：2018-03-07

Applicant: DENSO CORPORATION ,  PLASMA APPLICATIONS CO., LTD.

Inventor： Shota Kinoshita ,  Fumiaki Aoki ,  Daisuke Tanaka ,  Akimitsu Sugiura ,  Jan Husarik ,  Masashi Kando

IPC: H05H1/46 ,  H05H1/00 ,  H01T15/00 ,  H01T13/50 ,  F02P3/01 ,  H01T13/40 ,  H05H1/52 ,  H01T13/52

Abstract: An ignition apparatus is provided which ignites a mixture of air and fuel gas by plasma to generate an initial flame. The apparatus includes: a spark plug that includes an inner conductor, a cylindrical outer conductor that holds the inner conductor thereinside, and a dielectric that is provided between the inner conductor and the outer conductor, and that generates plasma in a plasma formation space between the inner conductor and the outer conductor; an electromagnetic wave power supply that generates an electromagnetic wave to apply electromagnetic wave power to the spark plug; an evaluation section that evaluates a state of formation of the plasma; a determination section that determines a matching object of the electromagnetic wave based on an evaluation result by the evaluation section; and a coupled state control section that controls a matching condition of the electromagnetic wave so that the electromagnetic wave matches the matching object.

公开(公告)号：US20200084872A1

公开(公告)日：2020-03-12

申请号：US16565910

申请日：2019-09-10

Applicant: DENSO CORPORATION ,  PLASMA APPLICATIONS CO., LTD. ,  TOKYO KEIKI INC.

Inventor： Daisuke TANAKA ,  Fumiaki AOKI ,  Akimitsu SUGIURA ,  Masashi KANDO ,  Jan HUSARIK ,  Hiroshi OKAJIMA

IPC: H05H1/52

Abstract: An ignition device ignites a mixture of air and fuel gas by plasma to generate an initial flame. The ignition device includes 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. The ignition device includes an electromagnetic wave power supply that generates the electromagnetic wave by inputting the electromagnetic wave power Ps to the spark plug and a power supply control unit that controls the electromagnetic wave power supply. The electromagnetic wave power supply is configured to generate high frequency power at a number of different frequencies. The power supply control unit outputs at least one of the plurality of high frequency powers generated by the electromagnetic wave power supply as the electromagnetic wave power.

公开(公告)号：US10772184B2

公开(公告)日：2020-09-08

申请号：US16565910

申请日：2019-09-10

Applicant: DENSO CORPORATION ,  PLASMA APPLICATIONS CO., LTD. ,  TOKYO KEIKI INC.

Inventor： Daisuke Tanaka ,  Fumiaki Aoki ,  Akimitsu Sugiura ,  Masashi Kando ,  Jan Husarik ,  Hiroshi Okajima

IPC: H05H1/52 ,  H01T13/32 ,  F02P13/00 ,  F02M57/06

Abstract: An ignition device ignites a mixture of air and fuel gas by plasma to generate an initial flame. The ignition device includes 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. The ignition device includes an electromagnetic wave power supply that generates the electromagnetic wave by inputting the electromagnetic wave power Ps to the spark plug and a power supply control unit that controls the electromagnetic wave power supply. The electromagnetic wave power supply is configured to generate high frequency power at a number of different frequencies. The power supply control unit outputs at least one of the plurality of high frequency powers generated by the electromagnetic wave power supply as the electromagnetic wave power.

公开(公告)号：US11181090B2

公开(公告)日：2021-11-23

申请号：US16007174

申请日：2018-06-13

Applicant: DENSO CORPORATION ,  PLASMA APPLICATIONS CO., LTD.

Inventor： Shota Kinoshita ,  Fumiaki Aoki ,  Daisuke Tanaka ,  Akimitsu Sugiura ,  Jan Husarik ,  Masashi Kando

IPC: F02P9/00 ,  F02P3/01 ,  H01T15/00 ,  H01T13/50 ,  F02P23/04

Abstract: In an ignition apparatus, an ignition plug is provided. In the ignition plug, a tubular outer conductor surrounds an inner conductor, and a dielectric member is disposed in the tubular outer conductor to define a plasma formation region between the inner conductor and the dielectric member. The plasma formation region has opposing first and second ends in the axial direction of the tubular outer conductor, and the first end of the plasma formation region communicates with the combustion chamber. A power source is connected between the inner and tubular outer conductors. A controller causes a power source to apply electromagnetic power pulses with intervals therebetween across the inner and tubular outer conductors during an ignition cycle of an engine. Each of the electromagnetic power pulses forms at least a corresponding plasma in the plasma formation region.

公开(公告)号：US20180363618A1

公开(公告)日：2018-12-20

申请号：US16007174

申请日：2018-06-13

Applicant: Denso Corporation ,  Plasma Applications Co., Ltd.

Inventor： Shota Kinoshita ,  Fumiaki Aoki ,  Daisuke Tanaka ,  Akimitsu Sugiura ,  Jan Husarik ,  Masashi Kando

IPC: F02P9/00 ,  F02P23/04

Abstract: In an ignition apparatus, an ignition plug is provided. In the ignition plug, a tubular outer conductor surrounds an inner conductor, and a dielectric member is disposed in the tubular outer conductor to define a plasma formation region between the inner conductor and the dielectric member. The plasma formation region has opposing first and second ends in the axial direction of the tubular outer conductor, and the first end of the plasma formation region communicates with the combustion chamber. A power source is connected between the inner and tubular outer conductors. A controller causes a power source to apply electromagnetic power pulses with intervals therebetween across the inner and tubular outer conductors during an ignition cycle of an engine. Each of the electromagnetic power pulses forms at least a corresponding plasma in the plasma formation region.

公开(公告)号：US20180279460A1

公开(公告)日：2018-09-27

申请号：US15914101

申请日：2018-03-07

Applicant: DENSO CORPORATION ,  PLASMA APPLICATIONS CO., LTD.

Inventor： Shota KINOSHITA ,  Fumiaki AOKI ,  Daisuke TANAKA ,  Akimitsu SUGIURA ,  Jan HUSARIK ,  Masashi KANDO

IPC: H05H1/46 ,  H01T15/00 ,  H05H1/00

CPC classification number: H05H1/46 ,  F02P3/01 ,  H01T13/40 ,  H01T13/50 ,  H01T13/52 ,  H01T15/00 ,  H05H1/0006 ,  H05H1/0062 ,  H05H1/52 ,  H05H2001/4607

Abstract: An ignition apparatus is provided which ignites a mixture of air and fuel gas by plasma to generate an initial flame. The apparatus includes: a spark plug that includes an inner conductor, a cylindrical outer conductor that holds the inner conductor thereinside, and a dielectric that is provided between the inner conductor and the outer conductor, and that generates plasma in a plasma formation space between the inner conductor and the outer conductor; an electromagnetic wave power supply that generates an electromagnetic wave to apply electromagnetic wave power to the spark plug; an evaluation section that evaluates a state of formation of the plasma; a determination section that determines a matching object of the electromagnetic wave based on an evaluation result by the evaluation section; and a coupled state control section that controls a matching condition of the electromagnetic wave so that the electromagnetic wave matches the matching object.