公开(公告)号：US10833487B2

公开(公告)日：2020-11-10

申请号：US16454510

申请日：2019-06-27

Applicant: DENSO CORPORATION

Inventor： Yuuki Kawata ,  Daisuke Tanaka ,  Daisuke Shimamoto ,  Naoto Hayashi

IPC: H01T13/34 ,  H01T13/08

Abstract: An ignition apparatus for an internal combustion engine includes a center electrode, a ground electrode, an insulator, a housing, and an insulator protective wall portion. The ground electrode is disposed such that a discharge gap is formed between the ground electrode and the center electrode. The insulator holds the center electrode on an inner side of the insulator. The housing holds the insulator on an inner side of the housing. The insulator protective wall portion is arranged to surround an outer circumference side of a distal end portion of the insulator. A distal end of the insulator protective wall portion is positioned further towards a distal end side than a distal end of the insulator is and further towards a proximal end side than a distal end of the center electrode is. The insulator protective wall portion includes an inward protruding portion that protrudes towards a side surface of the center electrode.

公开(公告)号：US10302062B2

公开(公告)日：2019-05-28

申请号：US15680265

申请日：2017-08-18

Applicant: DENSO CORPORATION

Inventor： Masahiro Ishitani ,  Akimitsu Sugiura ,  Makoto Toriyama ,  Satoru Nakayama ,  Yuuki Kondou ,  Hisaharu Morita ,  Naoto Hayashi ,  Yuuto Tamei ,  Takashi Oono ,  Shunichi Takeda

IPC: F02P3/04 ,  F02P15/10 ,  F02P11/06

Abstract: An ignition control apparatus of the present embodiment controls operation of an ignition plug provided so as to ignite an air-fuel mixed gas. The ignition control apparatus is characterized in that the ignition control apparatus includes: an ignition coil provided with a primary winding which allows a current to pass as a primary current therethrough and a second winding connected to the ignition coil, an increase and a decrease in the primary current generating a secondary current passing through the secondary winding; a DC power supply provided with a non-ground side output terminal, the non-ground side output terminal being connected to one end of the primary winding so that the primary current is made to pass through the primary winding; a first switching element configured of a semiconductor switching element provided with a first control terminal, a first power side terminal, and a first ground side terminal, the semiconductor switching element controlling on and off states of current supply between the first power side terminal and the first ground side terminal based on a first control signal inputted to the first control terminal, the first power side terminal being connected to the other end side of the primary winding, the first ground side terminal being connected to a ground side; a second switching element configured of a semiconductor switching element provided with a second control terminal, a second power side terminal, and a second ground side terminal, the semiconductor switching element controlling on and off states of current supply between the second power side terminal and the second ground side terminal based on a second control signal inputted to the second control terminal, the second ground side terminal being connected to the other end side of the primary winding; a third switching element configured of a semiconductor switching element provided with a third control terminal, a third power side terminal, and a third ground side terminal, the semiconductor switching element controlling on and off states of current supply between the third power side terminal and the third ground side terminal based on a third control signal inputted to the third control terminal, the third power side terminal being connected to the second power side terminal of the second switching element, the third ground side terminal being connected to the ground side; and an energy accumulation coil configured of an inductor, the inductor being interposed in a power line connecting the non-ground side output terminal of the DC power supply and the third power side terminal of the third switching element, the energy accumulation coil accumulating energy therein in response to turning on of the third switching element.

公开(公告)号：US11757261B2

公开(公告)日：2023-09-12

申请号：US17980033

申请日：2022-11-03

Applicant: DENSO CORPORATION

Inventor： Yuji Kaji ,  Nobuo Abe ,  Naoto Hayashi

IPC: H01T13/32 ,  H01T13/34 ,  H01T13/08 ,  H01T13/39

CPC classification number: H01T13/39 ,  H01T13/32

Abstract: A ground electrode for a spark plug includes a ground electrode body arranged to face a center electrode of the spark plug. The ground electrode includes a discharge portion mounted on the ground electrode body to face the center electrode with a spark gap between the discharge portion and the center electrode. The discharge portion is made of a platinum-based alloy of platinum, rhodium, and nickel. A first mass percent of the rhodium contained in the platinum-based alloy of the platinum, the rhodium, and the nickel is within a first range from 2 wt % to 20 wt % inclusive. A second mass percent of the nickel contained in the platinum-based alloy of the platinum, the rhodium, and the nickel being within a second range from 2.5 wt % to 12 wt % inclusive.

公开(公告)号：US10951011B2

公开(公告)日：2021-03-16

申请号：US16912751

申请日：2020-06-26

Applicant: DENSO CORPORATION

Inventor： Daisuke Tanaka ,  Fumiaki Aoki ,  Naoto Hayashi ,  Daisuke Shimamoto

IPC: H01T13/32

Abstract: A spark plug includes a housing, an insulator, a center electrode, and an earth electrode. The earth electrode has a gap-forming surface which forms a discharge gap between the gap-forming surface and a tip surface of the center electrode. The insulator includes an insulator protrusion protruding on the tip side of the housing in a plug axial direction. At least one of cross-sections passing through a plug center axis and parallel to the plug axial direction is referred to as an axial parallel cross-section. The outer peripheral surface of the insulator protrusion includes an insulator inclined surface extending inward toward the tip in the plug axial direction, in a straight line or a curve that is convex inward, in the axial parallel cross-section. In the axial parallel cross-section, a virtual straight line passing through both ends of the insulator inclined surface passes through the gap-forming surface.

公开(公告)号：US10594115B2

公开(公告)日：2020-03-17

申请号：US16405106

申请日：2019-05-07

Applicant: DENSO CORPORATION

Inventor： Daisuke Tanaka ,  Fumiaki Aoki ,  Daisuke Shimamoto ,  Naoto Hayashi

IPC: H01T13/32 ,  H01T13/26 ,  H01T13/08

Abstract: In a spark plug, a discharge gap is formed between a ground electrode and a central electrode. The ground electrode has a rod-shaped part and an opposing part. The opposing part faces the central electrode, and has a flat surface part and a slope surface part. The slope surface part is formed on a part of the opposing part in an extending direction of the ground electrode, and formed on the opposing part and gradually separated from the central electrode along a width direction of the opposing part. The spark plug has a ratio V/W within a range of 0.5

公开(公告)号：US10539114B2

公开(公告)日：2020-01-21

申请号：US15900841

申请日：2018-02-21

Applicant: DENSO CORPORATION

Inventor： Naoto Hayashi ,  Makoto Toriyama ,  Kaori Doi ,  Kanechiyo Terada ,  Kenta Kyouda ,  Satoru Nakayama

IPC: F02P3/045 ,  F02P3/08 ,  F02P15/10 ,  F02P9/00 ,  F02P15/08 ,  F02P5/15

Abstract: An ignition apparatus inputs energy during a predetermined energy input period after the interruption of a primary electric current by an ignition switch and a discharge of an ignition plug caused by a secondary electric current. Moreover, the ignition apparatus includes a blow-off detection unit that detects, during the energy input period IGW after the start of the discharge by the ignition plug, occurrence of blow-off of the discharge. When the secondary electric current I2 drops below a blow-off detection electric current threshold value Ibo at a time instant tbo in a “second region” where it is impossible to perform a re-discharge after blow-off, the blow-off detection unit determines that blow-off has occurred and the ignition apparatus stops the energy input from an energy input unit to an ignition coil. By preventing unnecessary energy input, it is possible to suppress unnecessary electric power consumption and wear of electrodes of the ignition plug.

公开(公告)号：US09932955B2

公开(公告)日：2018-04-03

申请号：US15302540

申请日：2015-04-07

Applicant: DENSO CORPORATION

Inventor： Naoto Hayashi ,  Makoto Toriyama ,  Kaori Doi ,  Kenechiyo Terada ,  Kenta Kyouda ,  Satoru Nakayama

IPC: F02P3/045 ,  F02P3/05 ,  F02P9/00 ,  F02P15/08 ,  F02P3/08 ,  F02P15/10 ,  F02P5/15

CPC classification number: F02P3/045 ,  F02P3/0876 ,  F02P5/15 ,  F02P9/00 ,  F02P9/002 ,  F02P9/007 ,  F02P15/08 ,  F02P15/10

Abstract: An ignition apparatus inputs energy during a predetermined energy input period after the interruption of a primary electric current by an ignition switch and a discharge of an ignition plug caused by a secondary electric current. Moreover, the ignition apparatus includes a blow-off detection unit that detects, during the energy input period IGW after the start of the discharge by the ignition plug, occurrence of blow-off of the discharge. When the secondary electric current I2 drops below a blow-off detection electric current threshold value Ibo at a time instant tbo in a “second region” where it is impossible to perform a re-discharge after blow-off, the blow-off detection unit determines that blow-off has occurred and the ignition apparatus stops the energy input from an energy input unit to an ignition coil. By preventing unnecessary energy input, it is possible to suppress unnecessary electric power consumption and wear of electrodes of the ignition plug.

公开(公告)号：US09765748B2

公开(公告)日：2017-09-19

申请号：US14783901

申请日：2014-04-11

Applicant: DENSO CORPORATION

Inventor： Masahiro Ishitani ,  Akimitsu Sugiura ,  Makoto Toriyama ,  Satoru Nakayama ,  Yuuki Kondou ,  Hisaharu Morita ,  Naoto Hayashi ,  Yuuto Tamei ,  Takashi Oono ,  Shunichi Takeda

IPC: F02P3/04 ,  F02P15/10 ,  F02P11/06

CPC classification number: F02P3/0435 ,  F02P11/06 ,  F02P15/10

Abstract: An ignition control device comprises: a first switching element having a power source side terminal connected to an other end side of a primary coil and a first ground side terminal connected to a ground side; a second switching element having a second ground side terminal connected to the other end side of the primary coil; a third switching element having a third power source side terminal connected to the second power source side terminal in the second switching element, and a third ground side terminal connected to the ground side; and an energy storage coil. The energy storage coil is an inductor interposed in an electric power line connecting a non-ground side output terminal in a DC power source and the third power source side terminal in the third switching element, and stores energy from the turning on of the third switching element.

公开(公告)号：US09166381B2

公开(公告)日：2015-10-20

申请号：US14202841

申请日：2014-03-10

Applicant: DENSO CORPORATION

Inventor： Naoto Hayashi ,  Kanechiyo Terada ,  Takashi Oono

IPC: F02P3/06 ,  H01T15/00

CPC classification number: H01T15/00 ,  F02P3/055 ,  F02P3/0552 ,  F02P9/002

Abstract: An ignition device includes an ignition coil with a primary coil and a secondary coil, a spark plug with center and ground electrodes for discharge therebetween, and a voltage limiting circuit. The voltage limiting circuit limits voltage applied between the electrodes of the spark plug such that the voltage has an absolute value limited within a predetermined voltage limiting value. The voltage limiting value is differentiated from each other in first and second stages. The first stage is defined as a period in which an initial discharge peak ends, the initial discharge peak being initially generated by electric energy. The second stage is defined as a period after the end of the initial discharge peak. The voltage limiting value in the first stage is lower than the voltage limiting value in the second stage.

Abstract translation: 点火装置包括具有初级线圈和次级线圈的点火线圈，具有中心的火花塞和用于在其间放电的接地电极以及电压限制电路。 电压限制电路限制施加在火花塞的电极之间的电压，使得电压具有在预定电压限制值内限制的绝对值。 电压限制值在第一和第二阶段彼此不同。 第一阶段被定义为初始放电峰值结束的时段，初始放电峰值最初由电能产生。 第二阶段定义为初始放电峰值结束后的一段时间。 第一级的电压限制值低于第二级的电压限制值。

公开(公告)号：US09897062B2

公开(公告)日：2018-02-20

申请号：US15039857

申请日：2014-11-28

Applicant: DENSO CORPORATION

Inventor： Satoru Nakayama ,  Makoto Toriyama ,  Akimitsu Sugiura ,  Masahiro Ishitani ,  Atsuya Mizutani ,  Kouji Andoh ,  Naoto Hayashi ,  Kaori Doi

IPC: F02P15/10 ,  F02P17/12 ,  F02P5/145 ,  F02P3/05 ,  F02P3/04 ,  F02P5/15 ,  F02P9/00

CPC classification number: F02P15/10 ,  F02P3/0407 ,  F02P3/0442 ,  F02P3/05 ,  F02P3/051 ,  F02P3/0892 ,  F02P5/145 ,  F02P5/15 ,  F02P9/002 ,  F02P9/007 ,  F02P17/12 ,  Y02T10/46

Abstract: An ignition device at least equipped with a DC power source, an ignition coil unit, a spark plug, an ignition switch, and an auxiliary power source, wherein the auxiliary power source is at least equipped with a discharge energy accumulating means, a discharge switch, and a discharge driver. The ignition device is further equipped with a secondary-current feedback controlling means comprising a secondary current detecting means for detecting a secondary current flowing during the ignition coil unit discharge period, and a secondary current feedback control circuit-for determining an upper limit and a lower limit for the secondary current from binary threshold values, and driving so as to open and close the discharge switch on the basis of the determination results. Furthermore, energy is introduced from the auxiliary power source without switching the polarity of the secondary current.