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公开(公告)号：US10539114B2
公开(公告)日：2020-01-21
申请号：US15900841
申请日：2018-02-21
申请人： DENSO CORPORATION
发明人： Naoto Hayashi , Makoto Toriyama , Kaori Doi , Kanechiyo Terada , Kenta Kyouda , Satoru Nakayama
摘要： 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：US09932955B2
公开(公告)日：2018-04-03
申请号：US15302540
申请日：2015-04-07
申请人： DENSO CORPORATION
发明人： Naoto Hayashi , Makoto Toriyama , Kaori Doi , Kenechiyo Terada , Kenta Kyouda , Satoru Nakayama
CPC分类号： F02P3/045 , F02P3/0876 , F02P5/15 , F02P9/00 , F02P9/002 , F02P9/007 , F02P15/08 , F02P15/10
摘要： 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：US09957946B2
公开(公告)日：2018-05-01
申请号：US15468424
申请日：2017-03-24
申请人： DENSO CORPORATION
发明人： Shota Kinoshita , Akimitsu Sugiura , Kaori Doi , Fumiaki Aoki
IPC分类号： F02P3/00 , F02P13/00 , H05H1/46 , F02P3/05 , F02P9/00 , F02P15/10 , F02P3/045 , F02P15/00 , F02P17/12 , H05H1/52
CPC分类号： F02P13/00 , F02P3/0456 , F02P3/05 , F02P3/053 , F02P9/002 , F02P15/005 , F02P15/10 , F02P17/12 , H05H1/46 , H05H1/52
摘要： 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.
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公开(公告)号：US09660424B2
公开(公告)日：2017-05-23
申请号：US15301601
申请日：2015-04-01
申请人： DENSO CORPORATION
发明人： Kaori Doi , Masamichi Shibata , Yuuto Tamei
IPC分类号： H01T13/20
CPC分类号： H01T13/20 , H01T13/39 , H01T13/467
摘要： A spark plug 1 has a center electrode 4 and a ground electrode 5 opposed to each other and causes a spark discharge to occur through application of a voltage between the center electrode 4 and the ground electrode 5 . Moreover, the center electrode 4 has a columnar main chip 10 provided at a distal end thereof by welding via a fusion portion 12 and an annular auxiliary chip 11 surrounding the fusion portion 12. Consequently, when a spark discharge occurring from the center electrode 4 is blown to the downstream side by the influence of a gas flow in a cylinder of an internal combustion engine, it is possible to suppress a cathode point from being formed in the fusion portion 12 since the fusion portion 12 is surrounded and thus protected by the auxiliary chip 11. As a result, it is possible to suppress wear of the center electrode 4, thereby extending the service life of the spark plug 1.
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公开(公告)号：US09234491B2
公开(公告)日：2016-01-12
申请号：US14718783
申请日：2015-05-21
发明人： Takanobu Aochi , Masamichi Shibata , Noriaki Nishio , Kaori Doi
CPC分类号： F02P15/001 , H01T13/02 , H01T13/20
摘要： A spark plug for an internal combustion engine includes a tubular housing, a tubular insulator, a center electrode, a ground electrode and a guide member. The guide member is configured to guide the flow of an air-fuel mixture in a combustion chamber of the engine to a spark gap formed between the center electrode and the ground electrode. Moreover, in the spark plug, the following dimensional relationships are satisfied: b≧−67.8×(a/D)+27.4; b≦−123.7×(a/D)+64.5; −0.4≦(a/D)≦0.4; and 0°≦b≦90°. Further, with an oblique angle θ being in the range of 0 to 30°, the following dimensional relationship is also satisfied: 0.8≦r/R≦1. Consequently, the spark plug can secure, with a simple configuration, a stable ignition capability regardless of the mounting posture of the spark plug to the engine.
摘要翻译： 用于内燃机的火花塞包括管状壳体，管状绝缘体，中心电极，接地电极和引导构件。 引导构件被构造成将发动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和接地电极之间的火花间隙。 此外，在火花塞中，满足以下尺寸关系：b≥-67.8×（a / D）+27.4; b＆nlE; -123.7×（a / D）+64.5; -0.4＆nlE;（a / D）＆nlE; 0.4; 0°＆nlE; b＆nlE; 90°。 此外，倾斜角度和角度; 在0至30°的范围内，还满足以下尺寸关系：0.8＆nlE; r / R＆nlE; 1。 因此，无论火花塞的安装姿势如何，发动机都可以以简单的结构确保火花塞的稳定点火能力。
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公开(公告)号：US10801461B2
公开(公告)日：2020-10-13
申请号：US15302034
申请日：2015-04-02
申请人： DENSO CORPORATION
发明人： Yasuomi Imanaka , Kaori Doi
IPC分类号： F02P3/05 , F02P3/08 , F02P5/15 , F02P15/10 , F02P17/12 , F02P3/02 , F02D35/02 , F02P3/04 , F02P9/00
摘要： An ignition apparatus performs energy input control in which energy is continuously inputted to an ignition coil to enable a spark discharge in a predetermined energy input period after interrupting a primary current by an ignition switch and generating a discharge of a spark plug by a secondary current. A combustion state determination circuit determines a combustion state by comparing a combustion pressure P detected by a combustion state detector. When the combustion pressure P is smaller than a second threshold Pth2, and there is room for improving the combustion state with respect to the present energy input condition, the energy input period IGW is increased or a target secondary current I2* is increased. By compensating the condition of the energy input control in accordance with the combustion state, a target combustion state can be achieved with just enough energy consumption.
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公开(公告)号：US10291000B2
公开(公告)日：2019-05-14
申请号：US15743732
申请日：2016-07-05
申请人： DENSO CORPORATION
发明人： Akimitsu Sugiura , Kenji Hattori , Shunichi Takeda , Kaori Doi , Ryota Wakasugi
IPC分类号： F02P3/00 , H01T13/00 , H01T15/00 , F02P13/00 , F02P15/00 , H01T13/20 , F02P3/04 , H01F38/12 , H01T13/08 , H01T13/38 , H01T13/04 , H01T13/42 , H01T13/32 , F02P3/02
摘要： An ignition apparatus includes a spark plug and an ignition coil. The spark plug has a plug terminal protruding proximalward from an insulator. The ignition coil includes a coil main body, which includes a primary coil and a secondary coil, and a helical spring that electrically connects the secondary coil and the plug terminal. The plug terminal is made of a material that is both electrically conductive and magnetic. The plug terminal includes a terminal main body, which has an outer diameter greater than an inner diameter of the spring, and a terminal extension portion that has an outer diameter less than the inner diameter of the spring and extends proximalward from the terminal main body. A distal end portion of the spring abuts the terminal main body. The terminal extension portion is inserted and arranged in the spring. Between an outer circumferential surface of the terminal extension portion and an inner circumferential surface of the spring, there is interposed an insulating member.
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公开(公告)号：US10247164B2
公开(公告)日：2019-04-02
申请号：US15694013
申请日：2017-09-01
申请人： DENSO CORPORATION
发明人： Shota Kinoshita , Fumiaki Aoki , Akimitsu Sugiura , Kaori Doi
IPC分类号： F02P3/055 , F02P17/02 , H01T15/00 , H01F38/12 , F02P3/01 , F02P3/00 , F02P9/00 , F02P5/15 , F02P17/12
摘要： An ignition apparatus includes an ignition plug, a boost transformer, an ignition power source and a measurement unit. The ignition plug has a center electrode and a ground electrode. The boost transformer supplies the ignition plug with electric power generated in a secondary coil upon supply of AC power from the ignition power source to a primary coil. The measurement unit measures the discharge voltage of the ignition plug. The ignition power source includes a discharge state determining unit that determines the discharge state of the ignition plug based on the measured discharge voltage and a current controlling unit that controls electric current supplied to the primary coil. When a discharge path formed between the center and ground electrodes of the ignition plug is determined by the discharge state determining unit as being in an over-extended state, the current controlling unit reduces the electric current supplied to the primary coil.
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公开(公告)号：US08963408B2
公开(公告)日：2015-02-24
申请号：US14101386
申请日：2013-12-10
申请人： Denso Corporation
摘要： 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.
摘要翻译： 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。
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公开(公告)号：US11664645B2
公开(公告)日：2023-05-30
申请号：US17528902
申请日：2021-11-17
申请人： DENSO CORPORATION
摘要： A spark plug includes a housing, a porcelain insulator, a center electrode, a ground electrode, and a prechamber-defining portion. The prechamber-defining portion has a prechamber formed therein. The prechamber-defining portion has a plurality of spray holes. At least one of the spray holes is an upstream spray hole which is arranged upstream of a plug center axis in a gas flow within a main combustion chamber and designed such that and an angle which an extension in an opening direction makes with an inner wall surface of the prechamber is selected to be larger than 90°. A spark gap is formed upstream of a plug center axis in the gas flow within the main combustion chamber.
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