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公开(公告)号：US20230147920A1
公开(公告)日：2023-05-11
申请号：US17980033
申请日：2022-11-03
Applicant: DENSO CORPORATION
Inventor： Yuji KAJI , Nobuo ABE , Naoto HAYASHI
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.
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公开(公告)号：US20210028606A1
公开(公告)日：2021-01-28
申请号：US16936778
申请日：2020-07-23
Applicant: DENSO CORPORATION
Inventor： Hiroshi ARAKI , Naoto HAYASHI , Hikaru TAKASHIMA
Abstract: In a method for manufacturing a spark plug, a space on a proximal end side of a center electrode in a shaft hole of an insulator is filled with first electrically conductive glass powder. A space on the proximal end side of the first electrically conductive glass powder in the shaft hole is filled with resistor composition powder. A space on the proximal end side of the resistor composition powder in the shaft hole is filled with second electrically conductive glass powder. The first electrically conductive glass powder, the resistor composition powder, and the second electrically conductive glass powder are sintered in the shaft hole. Prior to filling of the resistor composition powder, at least one of the insulator and the first electrically conductive glass powder is placed in an uncharged state, or the insulator and the first electrically conductive glass powder are placed in the same charged state.
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公开(公告)号：US20180180014A1
公开(公告)日：2018-06-28
申请号：US15900841
申请日：2018-02-21
Applicant: DENSO CORPORATION
Inventor： Naoto HAYASHI , Makoto TORIYAMA , Kaori DOI , Kenechiyo TERADA , Kenta KYOUDA , Satoru NAKAYAMA
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.
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公开(公告)号：US20200335950A1
公开(公告)日：2020-10-22
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.
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公开(公告)号：US20160061177A1
公开(公告)日：2016-03-03
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
CPC classification number: F02P3/0435 , F02P11/06 , F02P15/10
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 fist 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.
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Patent Agency Ranking
公开(公告)号：US20200006926A1
公开(公告)日：2020-01-02
申请号：US16454510
申请日：2019-06-27
Applicant: DENSO CORPORATION
Inventor： Yuuki KAWATA , Daisuke TANAKA , Daisuke SHIMAMOTO , Naoto HAYASHI
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.
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公开(公告)号：US20170342955A1
公开(公告)日：2017-11-30
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
CPC classification number: F02P3/0435 , F02P11/06 , F02P15/10
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.
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公开(公告)号：US20170045025A1
公开(公告)日：2017-02-16
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
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.
Abstract translation: 一种至少配备有直流电源，点火线圈单元，火花塞，点火开关和辅助电源的点火装置，其中辅助电源至少配备有放电能量积存装置，放电开关 ，和放电驱动器。 点火装置还配备有二次电流反馈控制装置，该二次电流反馈控制装置包括用于检测在点火线圈单元放电时段期间流动的次级电流的二次电流检测装置和用于确定上限和下限的次级电流反馈控制电路 根据二进制阈值限制二次电流，并根据确定结果进行驱动以便打开和关闭放电开关。 此外，从辅助电源引入能量而不切换次级电流的极性。
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公开(公告)号：US20170022957A1
公开(公告)日：2017-01-26
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
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.
Abstract translation: 点火装置在通过点火开关中断初级电流之后的预定能量输入期间和由二次电流引起的火花塞的放电时输入能量。 此外，点火装置包括吹出检测单元，其在通过火花塞开始放电之后的能量输入期间IGW期间检测放电的发生。 当二次电流I2在不能在吹出后进行再放电的“第二区域”中的时刻tbo的时间点下降到低于泄漏检测电流阈值Ibo时，吹出检测单元 确定已经发生吹出，并且点火装置停止从能量输入单元到点火线圈的能量输入。 通过防止不必要的能量输入，可以抑制火花塞的电极的不必要的电力消耗和磨损。
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公开(公告)号：US20140252976A1
公开(公告)日：2014-09-11
申请号：US14202841
申请日：2014-03-10
Applicant: DENSO CORPORATION
Inventor： Naoto HAYASHI , Kanechiyo TERADA , Takashi OONO
IPC: 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 therebeteween, 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放电的火花塞以及电压限制电路。 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。
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