公开(公告)号：US20230094043A1

公开(公告)日：2023-03-30

申请号：US18074722

申请日：2022-12-05

Applicant: DENSO CORPORATION

Inventor： Akimitsu SUGIURA

IPC: H01T13/32 ,  H01T13/34 ,  H01T13/54

Abstract: A spark plug includes: a cylindrical insulator; a center electrode, held on an inner circumferential side of the insulator, protruding from the insulator toward a tip end side; a cylindrical housing holding the insulator on an inner circumferential side; a ground electrode forming a discharge gap between the ground electrode and the center electrode on the inner circumferential side of the housing; and a plug cover provided in a tip end portion of the housing to cover a pre-combustion chamber in which the discharge gap is arranged. The plug cover is provided with an injection hole that communicates the pre-combustion chamber to the outside. The ground electrode includes a discharge-side end portion that faces the discharge gap and a joining-side end portion that is joined to the housing. The discharge-side end portion is arranged further toward a base end side in an axial direction than the joining-side end portion is.

公开(公告)号：US20220251999A1

公开(公告)日：2022-08-11

申请号：US17732317

申请日：2022-04-28

Applicant: DENSO CORPORATION

Inventor： Shota KINOSHITA ,  Akimitsu SUGIURA

IPC: F02B19/12

Abstract: An ignition device of the present embodiment is an ignition device for an internal combustion and includes an ignition plug, an operating information acquisition unit and an ignition control unit. The ignition plug includes an accessory chamber and an injection hole from which flame is to be injected from the accessory chamber to a main combustion chamber. The operating information acquisition unit is configured to acquire operating information regarding an operating state of the internal combustion. The ignition control unit is configured to control an ignition energy profile that affects an ignition state of an air-fuel mixture based on the operating information acquired by the operating information acquisition unit.

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：US20200011284A1

公开(公告)日：2020-01-09

申请号：US16502437

申请日：2019-07-03

Applicant: DENSO CORPORATION

Inventor： Akimitsu SUGIURA ,  Kaori DOI

IPC: F02P9/00 ,  F02D41/30 ,  F02P3/01

Abstract: An ignition device for an internal combustion engine is provided which includes a spark plug and a controller. The spark plug has a housing with a head protruding into a combustion chamber of the engine. The head has at least a portion located downstream of a spark gap of the spark plug in an air-fuel mixture flow within the combustion chamber. The controller works to perform a plurality of discharge events in the spark plug in each cycle of an operation of the engine. This improves the ability of the spark plug to ignite the mixture without need to increase an ignition energy.

公开(公告)号：US20180038338A1

公开(公告)日：2018-02-08

申请号：US15667923

申请日：2017-08-03

Applicant: DENSO CORPORATION

Inventor： Akimitsu SUGIURA ,  Kaori DOI ,  Yuki MURAYAMA ,  Fumiaki AOKI ,  Noriaki NISHIO

IPC: F02P15/10 ,  F02P5/15

Abstract: An ignition apparatus for an internal combustion engine provided with an ignition coil and a spark plug. An ECU enables operation of a plurality of continuous discharges in the spark plug and also detects a flow speed of a combustible air/fuel mixture. In a first discharge, a supply of a primary current terminates the first discharge, with energy remaining in the ignition coil, from an initiation of the ignition to an initiation of the spark plug, when the detected flow speed exceeds a predetermined first threshold. Thereafter, a second discharge is performed by shutting off the primary current.

公开(公告)号：US20170276114A1

公开(公告)日：2017-09-28

申请号：US15468424

申请日：2017-03-24

Applicant: DENSO CORPORATION

Inventor： Shota KINOSHITA ,  Akimitsu SUGIURA ,  Kaori DOI ,  Fumiaki AOKI

IPC: F02P13/00 ,  H05H1/46

CPC classification number: F02P13/00 ,  F02P3/0456 ,  F02P3/05 ,  F02P3/053 ,  F02P9/002 ,  F02P15/005 ,  F02P15/10 ,  F02P17/12 ,  H05H1/46 ,  H05H1/52

Abstract: An ignition device includes a spark plug, a measurement value detector, an electrical breakdown determiner, an AC voltage applying section, and a first changing section. The measurement value detector includes primary and secondary coils, and detects at least one measurement value among an ignition coil, a primary current, a primary voltage, a secondary current, and a secondary voltage. The electrical breakdown determiner determines whether a discharge has become an electrical breakdown state based on the measurement value. The AC voltage applying section applies an AC voltage of a first predetermined frequency that causes voltage resonance to the primary coil. The first changing section changes the frequency of the AC voltage to a second predetermined frequency that can maintain the electrical breakdown state and is lower in frequency than the first predetermined frequency when it is determined that the discharge has become the electrical breakdown state.

公开(公告)号：US20170218913A1

公开(公告)日：2017-08-03

申请号：US15500659

申请日：2015-07-27

Applicant: DENSO CORPORATION ,  MITSUBISHI HEAVY INDUSTRIES, LTD.

Inventor： Kenji KANEHARA ,  Naoki KIDO ,  Akimitsu SUGIURA ,  Nobuyuki TAGUCHI ,  Ryu SUZUKI ,  Akihiro YUUKI ,  Minoru ICHIHARA ,  Tomohiro NOGUCHI

IPC: F02P23/04

CPC classification number: F02P23/04 ,  F02B19/1095 ,  F02B19/12 ,  F02P9/007 ,  F02P13/00

Abstract: In a laser ignition device which is mounted in an internal combustion engine and at least includes a laser spark plug equipped with an optical window which protects an optical device from high temperature and high pressure generated in a combustion chamber and a prechamber cap equipped with a cylindrical prechamber, a prechamber throat portion that is a bottomed cylinder with a sectional area smaller than that of the prechamber, and a plurality of prechamber spray holes which communicate with a combustion chamber on a side of a closed end of the prechamber throat portion, the prechamber cap is arranged between the optical window and the combustion chamber. A converging point FP is located inside the prechamber to ignite an air-fuel mixture delivered into the prechamber, thereby jetting combustion flames from the prechamber into the combustion chamber to fire the internal combustion engine. The center axis AXF of the prechamber is oriented horizontally eccentrically from the center axis AXS of the prechamber throat portion.

公开(公告)号：US20160102648A1

公开(公告)日：2016-04-14

申请号：US14893740

申请日：2014-05-20

Applicant: DENSO CORPORATION

Inventor： Satoru NAKAYAMA ,  Makoto TORIYAMA ,  Akimitsu SUGIURA ,  Masahiro ISHITANI ,  Yuuki KONDOU

IPC: F02P9/00 ,  F02P5/145 ,  F02P7/03 ,  F02P3/00

CPC classification number: F02P9/002 ,  F02P3/005 ,  F02P3/0435 ,  F02P3/0892 ,  F02P5/145 ,  F02P5/1502 ,  F02P7/03 ,  F02P9/007 ,  F02P15/10 ,  Y02T10/46

Abstract: An ignition control apparatus for engines is provided. The ignition control apparatus is designed to control a switch to release energy stored in a capacitor during spark discharge, thereby supplying a primary current to an other end side opposite a one end of a primary winding of an ignition coil connected to a dc power supply. This provides the ignition control apparatus which is capable of minimizing an increase in size or manufacturing cost and stabilizing the state of combustion of an air-fuel mixture.

Abstract translation: 提供一种用于发动机的点火控制装置。 点火控制装置被设计成控制开关以在火花放电期间释放存储在电容器中的能量，从而向连接到直流电源的点火线圈的初级绕组的一端相对的另一端侧提供初级电流。 这提供了能够最小化尺寸增加或制造成本以及稳定空气 - 燃料混合物的燃烧状态的点火控制装置。

公开(公告)号：US20230216279A1

公开(公告)日：2023-07-06

申请号：US18175172

申请日：2023-02-27

Applicant: DENSO CORPORATION

Inventor： Akimitsu SUGIURA

IPC: H01T13/54

CPC classification number: H01T13/54

Abstract: In a spark plug, at least one injection hole serves as a ground-directed injection hole arranged to face a facing side of a ground electrode. An extension line of the center axis of the at least one ground-directed injection hole intersects with the facing side of the ground electrode at an intersection point. The facing side of the ground electrode has a closer region closer to the projection-end edge of the ground electrode than the intersection point is. The closer region of the facing side intersects with the extension line of the center axis of the ground-directed injection hole at a predetermined angle as viewed in the axial direction of the spark plug. The predetermined angle being an obtuse angle.

公开(公告)号：US20230193870A1

公开(公告)日：2023-06-22

申请号：US18110539

申请日：2023-02-16

Applicant: DENSO CORPORATION

Inventor： Akimitsu SUGIURA

IPC: F02P13/00 ,  F02B19/12 ,  F02P15/10

CPC classification number: F02P13/00 ,  F02B19/12 ,  F02P15/10

Abstract: Disclosed is an ignition apparatus for an internal combustion engine. The ignition apparatus includes a spark plug, an ignition coil and a controller. The spark plug has an auxiliary combustion chamber in which a discharge gap is arranged. The ignition coil is configured to apply a voltage to the spark plug. The controller is configured to perform a multiple-discharge mode in which discharge is generated at least twice, with a discharge pause period intervening therebetween, across the discharge gap within a period from a compression stroke to an expansion stroke of the internal combustion engine.