公开(公告)号：US09970406B2

公开(公告)日：2018-05-15

申请号：US15059742

申请日：2016-03-03

Applicant: DENSO CORPORATION

Inventor： Shota Kinoshita ,  Shinichi Okabe ,  Akimitsu Sugiura

IPC: F02P9/00 ,  F02P11/00 ,  F02P23/04 ,  G01R29/00 ,  H05H1/24 ,  H05H1/46 ,  H05H1/52 ,  H01T13/50

CPC classification number: F02P9/007 ,  F02P11/00 ,  F02P23/04 ,  G01R29/00 ,  H01T13/50 ,  H05H1/24 ,  H05H1/46 ,  H05H1/52

Abstract: An ignition apparatus for an internal combustion engine is provided which includes a state-of-discharge determiner working to determine whether a center and a ground electrode of a spark plug are electrically conducting with each other or insulated from each other. When the center and ground electrodes are determined to be conducted with each other, the ignition apparatus alters controlled conditions of a high-frequency power supply which supplies a high-frequency power to the spark plug so as to decrease an average of a primary voltage outputted from the high-frequency power supply to the spark plug, thereby reducing an actual current flowing between the center and ground electrodes of the spark plug. This eliminates the risk of mechanical wear of the center and ground electrodes which usually arises from the flow of high current between the center and ground electrodes, thus resulting in an increase in service life of the spark plug.

公开(公告)号：US09287685B2

公开(公告)日：2016-03-15

申请号：US14651040

申请日：2013-12-10

Applicant: DENSO CORPORATION

Inventor： Takanobu Aochi ,  Takayuki Inohara ,  Shinichi Okabe ,  Masamichi Shibata ,  Kaori Doi

IPC: H01T13/20 ,  H01T13/32

CPC classification number: H01T13/32 ,  H01T1/20 ,  H01T13/02 ,  H01T13/20

Abstract: A spark plug for an internal combustion engine has a housing, an insulator, a center electrode, a ground electrode, and a tip projecting portion. The tip projecting portion has an air guiding surface. In the spark plug, when viewed from a plug axial direction, a straight line that connects the center, in the plug circumferential direction, of the erect portion of the ground electrode and a center point of the center electrode is a straight line. An extension line of the air guiding surface is a straight line. A distance between an intersection, between the straight line and the straight line, and the center point of the center electrode is a (positive towards the side moving away from the erect portion. An angle formed by the straight line and the straight line is b. A diameter of the housing is D. At this time, all of b≧−67.8×(a/D)+27.4, b≦−123.7×(a/D)+64.5, −0.4≦(a/D)≦0.4, and 0°

Abstract translation: 用于内燃机的火花塞具有壳体，绝缘体，中心电极，接地电极和尖端突出部分。 尖端突出部具有空气引导面。 在火花塞中，当从插头轴向观察时，将接地电极的直立部分的中心与插塞圆周方向连接的直线与中心电极的中心点成直线。 导气面的延长线是直线。 在直线与直线之间的交点之间的距离和中心电极的中心点之间的距离为（朝着直立部分移动的一侧为正），由直线和直线形成的角度为b （a / D）+27.4，b＆nlE; -123.7×（a / D）+64.5，-0.4＆nlE;（a / D） ＆nlE; 0.4和0°

公开(公告)号：US08963408B2

公开(公告)日：2015-02-24

申请号：US14101386

申请日：2013-12-10

Applicant: Denso Corporation

Inventor： Masamichi Shibata ,  Takayuki Inohara ,  Shinichi Okabe ,  Takanobu Aochi ,  Kaori Doi

IPC: H01T13/20 ,  H01T13/02

CPC classification number: H01T13/02 ,  H01T13/32

Abstract: A spark plug for internal combustion engines is provided, where the spark plug includes a cylindrical housing, a cylindrical insulation porcelain part, a center electrode, and a ground electrode. The insulation porcelain is housed in the housing and the center electrode is held inside the insulation porcelain. The ground electrode protrudes from a top end portion of the housing. A spark discharge gap is left between the ground and center electrodes. Further, first to third projections are formed on the top end portion. The first projection is opposed to the ground electrode with the center electrode therebetween. The second projection is closer to the ground electrode than to the first projection. The third projection is closer to the first projection than to the ground electrode.

Abstract translation: 提供了一种用于内燃机的火花塞，其中火花塞包括圆柱形壳体，圆柱形绝缘瓷部件，中心电极和接地电极。 绝缘瓷被容纳在壳体中，中心电极保持在绝缘瓷内。 接地电极从壳体的顶端部突出。 火花放电间隙留在接地和中心电极之间。 此外，在顶端部形成有第一至第三突起。 第一突起与其间具有中心电极的接地电极相对。 第二突起比第一突起更靠近接地电极。 第三投影比接地电极更靠近第一投影。

公开(公告)号：US09903335B2

公开(公告)日：2018-02-27

申请号：US15285841

申请日：2016-10-05

Applicant: DENSO CORPORATION

Inventor： Shota Kinoshita ,  Shinichi Okabe ,  Fumiaki Aoki ,  Akimitsu Sugiura

IPC: F02P3/00 ,  F02P23/04 ,  F02P9/00 ,  F02P3/05 ,  F02P3/01 ,  F02P3/04 ,  F02P15/10

CPC classification number: F02P9/002 ,  F02P3/01 ,  F02P3/0435 ,  F02P3/05 ,  F02P9/007 ,  F02P15/10 ,  F02P23/04

Abstract: An ignition device includes: an ignition plug producing plasma discharge between a pair of discharge electrodes of an ignition plug; an ignition coil provided with a primary coil and a secondary coil, the secondary coil applying voltage between the pair of discharge electrodes; a voltage applying unit applying alternating current voltage to the primary coil, a frequency of the alternating current voltage being set to produce voltage resonance in a circuit including the ignition plug and the secondary coil. The voltage applying unit sets an output period of the alternating current voltage to be longer than a first period at which a partial breakdown start to occur at the pair of discharge electrodes, and shorter than a second period at which a total breakdown occurs at the pair of discharge electrodes, when an air/fuel ratio is lower than a predetermined threshold.

公开(公告)号：US09825431B2

公开(公告)日：2017-11-21

申请号：US14554763

申请日：2014-11-26

Applicant: DENSO CORPORATION

Inventor： Hideaki Kosuge ,  Shinichi Okabe ,  Akimitsu Sugiura

IPC: H01T13/20 ,  H01T13/32 ,  H01T13/08 ,  H01T13/52 ,  H01T13/50 ,  F02P23/04

CPC classification number: H01T13/20 ,  F02P23/045 ,  H01T13/08 ,  H01T13/32 ,  H01T13/50 ,  H01T13/52

Abstract: An ignition device includes a center electrode, a center dielectric covering the center electrode, a ground electrode disposed so as to form a discharge space with the center dielectric, and a high energy source for applying an AC voltage between the center electrode and the ground electrode to generate a streamer discharge. A distal end portion of the center electrode projects beyond a distal end of the ground electrode to an inside of the combustion chamber of an internal combustion engine to make a dielectric discharge portion. The ground electrode is formed with an airflow inlet and en airflow outlet at a lateral portion thereof for enabling an in-cylinder airflow to be introduced into the discharge space. A distal end portion of the ground electrode projects radially inward to make a ground electrode projecting portion so that a discharge space narrow portion is formed with the dielectric discharge portion.

公开(公告)号：US09444229B2

公开(公告)日：2016-09-13

申请号：US14847314

申请日：2015-09-08

Applicant: NIPPON SOKEN, INC. ,  DENSO CORPORATION

Inventor： Shota Kinoshita ,  Shinichi Okabe ,  Akitmitsu Sugiura

IPC: H01T13/32 ,  H01T13/52

CPC classification number: H01T13/32 ,  H01T13/52

Abstract: A spark plug for an internal combustion engine includes a ground electrode, an insulator held inside the ground electrode, and a center electrode held inside the insulator. When a segment of a line extending in a plug radial direction to connect an arbitrary start point on a surface of the ground electrode and an outer peripheral surface of the insulator is a line segment H, a point of intersection between the line segment H and the outer peripheral surface of the insulator is an intersection point K, a length of the line segment H is L1, and an axial distance between the intersection point K and the distal end of the insulator is L2, the ground electrode is provided on the surface thereof with a shortest discharge forming portion as the start point along a plug circumferential direction at which a value of (L1+L2) becomes minimum.

Abstract translation: 用于内燃机的火花塞包括接地电极，保持在接地电极内部的绝缘体和保持在绝缘体内部的中心电极。 当沿插塞径向方向延伸以将接地电极的表面上的任意起始点和绝缘体的外周表面连接的线段是线段H时，线段H与线段H之间的交点 绝缘体的外周面是交点K，线段H的长度为L1，交点K与绝缘体的前端的轴向距离为L2，接地电极设置在其表面上 其中最短的排出形成部分作为（L1 + L2）的值变得最小的塞子圆周方向的起始点。

公开(公告)号：US09371806B2

公开(公告)日：2016-06-21

申请号：US14780801

申请日：2014-01-28

Applicant: DENSO CORPORATION

Inventor： Takanobu Aochi ,  Takayuki Inohara ,  Shinichi Okabe ,  Masamichi Shibata ,  Noriaki Nishio

IPC: H01T13/02 ,  F02M57/06 ,  H01T13/20

CPC classification number: F02M57/06 ,  F02P13/00 ,  H01T13/02 ,  H01T13/20 ,  H01T13/32

Abstract: A spark plug 1 includes a housing 2, an insulator 3, a center electrode 4 held inside the insulator 3 such that a distal end portion 41 protrudes, a ground electrode 5 including a standing portion 51 and an opposing portion 52, and a guide member 22 that has a guide surface 221 facing the standing portion 51 of the ground electrode 5 and functions to guide a flow of an air-fuel mixture in a combustion chamber of an internal combustion engine to a spark discharge gap G formed between the center electrode 4 and the opposing portion 52 of the ground electrode 5. The opposing portion 52 of the ground electrode 5 has an opposing surface 521 that opposes the center electrode 4, a back surface 522 on the opposite axial side to the opposing surface 521, and a pair of side surfaces 523 and 524 that connect the opposing surface 521 and the back surface 522. Of the pair of side surfaces 523 and 524, at least the side surface 523 on the guide member 22 side is formed so as to make an obtuse angle with the opposing surface 521.

Abstract translation: 火花塞1包括壳体2，绝缘体3，保持在绝缘体3内部的中心电极4，使得前端部41突出，包括立起部51和相对部52的接地电极5和引导构件 22，其具有面对接地电极5的竖立部分51的引导表面221，并且用于将内燃机的燃烧室中的空气燃料混合物的流动引导到形成在中心电极4之间的火花放电间隙G 和接地电极5的相对部分52.接地电极5的相对部分52具有与中心电极4相对的相对表面521，与相对表面521相对的轴向侧上的后表面522和一对 连接相对表面521和后表面522的侧表面523和524。在一对侧表面523和524中，至少引导构件22侧的侧表面523形成为形成钝角 与相对表面521。

公开(公告)号：US09331458B2

公开(公告)日：2016-05-03

申请号：US14134217

申请日：2013-12-19

Applicant: DENSO CORPORATION

Inventor： Shinichi Okabe ,  Yoshihiro Nakase ,  Akimitsu Sugiura ,  Yuya Abe

IPC: H01T13/20 ,  H01T13/52 ,  H01T13/50 ,  F02P9/00

CPC classification number: H01T13/52 ,  F02P9/007 ,  H01T13/20 ,  H01T13/50

Abstract: An ignition system for an internal combustion engine includes a discharge portion of the center electrode in which a part thereof is surrounded by a bottom portion and a tubular tip portion of the center dielectric, the part of the discharge portion and the tubular tip portion are projected into a combustion chamber of the internal combustion engine from a substantially annular tip portion of the ground electrode that opens to the combustion chamber at a distal end of the ground electrode, a diameter-changing portion formed by reducing a diameter of a part of the tubular tip portion in a radial direction gradually as approaching toward a tip thereof, and a thin-walled portion formed by reducing a thickness of the tip of the tubular tip portion.

Abstract translation: 一种用于内燃机的点火系统包括中心电极的排出部分，其一部分被中心电介质的底部和管状末端部分包围，排出部分和管状尖端部分的一部分被突出 从接地电极的基本上环形的尖端部分在内部燃烧室的燃烧室中进入到在接地电极的远端处的燃烧室的直径变化部分，所述直径变化部分通过减小管状部分的一部分的直径而形成 沿径向方向的尖端部分逐渐接近尖端，并且通过减小管状末端部分的尖端的厚度而形成的薄壁部分。

公开(公告)号：US09391431B2

公开(公告)日：2016-07-12

申请号：US14093096

申请日：2013-11-29

Applicant: DENSO CORPORATION

Inventor： Shinichi Okabe ,  Yoshihiro Nakase ,  Akimitsu Sugiura ,  Yuya Abe

IPC: H01T13/20 ,  H01T13/52 ,  H01T13/46

CPC classification number: H01T13/52 ,  H01T13/467

Abstract: A barrier discharge ignition apparatus has a tip end exposed to a combustion chamber of an internal combustion engine and, when subjected to a high-frequency high-voltage AC burst, generates streamer discharges for igniting a fuel/air mixture in the combustion chamber. A central electrode of the apparatus, covered by a dielectric layer and coaxially enclosed in a ground electrode, extends into the combustion chamber to a greater distance than the ground electrode. An electrode portion close to the tip end of the inner periphery of the ground electrode protrudes towards the dielectric layer, for creating a localized high-density electric field. The streamer discharges thereby enter both the to combustion chamber and also a discharge chamber of the ignition apparatus.

Abstract translation: 阻挡放电点火装置具有暴露于内燃机的燃烧室的前端，当经受高频高压交流脉冲时，产生用于点燃燃烧室内的燃料/空气混合物的流光放电。 该装置的中心电极被电介质层覆盖并同轴地封闭在接地电极中，延伸到燃烧室中至比接地电极更大的距离。 靠近接地电极的内周的末端的电极部朝向电介质层突出，用于产生局部高密度电场。 流光放电从而进入燃烧室和点火装置的放电室。

公开(公告)号：US09267474B2

公开(公告)日：2016-02-23

申请号：US13943868

申请日：2013-07-17

Applicant: DENSO CORPORATION

Inventor： Yuya Abe ,  Akimitsu Sugiura ,  Shinichi Okabe

IPC: F02P23/04 ,  F02M57/06

CPC classification number: F02M57/06 ,  F02P23/045

Abstract: In an ignition device, a base section of a discharge chamber is formed by a part of a central dielectric body. A front section of a ground electrode and a front end section of the central dielectric body are projected toward a combustion chamber of a head cylinder of an internal combustion engine by a predetermined height which is measured from a top ceiling wall of the head cylinder. The predetermined height of the front end section of the central dielectric body projected into the inside of the head cylinder is the same or higher than the predetermined height of the front end section of the ground electrode projected into the inside of the head cylinder. The predetermined height of the front end section of the ground electrode is within a range of 3 mm to 25 mm.

Abstract translation: 在点火装置中，放电室的基部由中心电介质体的一部分形成。 将接地电极的前部和中央电介质体的前端部朝向内燃机的头部气缸的燃烧室突出从头部气缸的顶部顶壁测量的预定高度。 突出到头筒内侧的中央电介质体的前端部的预定高度与突出于头筒内侧的接地电极的前端部的预定高度相同或更高。 接地电极的前端部的预定高度在3mm〜25mm的范围内。