公开(公告)号：US20180266381A1

公开(公告)日：2018-09-20

申请号：US15573914

申请日：2016-05-12

申请人： DENSO CORPORATION ,  SOKEN, INC.

发明人： Hideaki KOSUGE ,  Fumiaki AOKI ,  Shohei ISHIDA ,  Shunichi TAKEDA ,  Kazuaki UEDA

IPC分类号： F02P15/10 ,  F02P17/12 ,  F02P3/04

摘要： An ignition apparatus for internal combustion engines is provided. The ignition apparatus is equipped with an ECU. The ECU monitors a path length of a discharge of a spark for a period of time in which a second circuit delivers or inputs energy in the form of a threshold value determination. When the path length has become too short, the ECU determines that ignition is expected to be delayed and then selects a special mode to control the delay of the ignition. The ECU increase a target value of an energy input amount. This enables the delay of ignition resulting from a short extension of the path length to be minimized. The ignition apparatus equipped with the second circuit to continue the discharge of sparks is, thus, capable of reducing a variation in ignition without the need for uniformly increasing the energy input amount.

公开(公告)号：US20200112144A1

公开(公告)日：2020-04-09

申请号：US16590653

申请日：2019-10-02

申请人： DENSO CORPORATION

发明人： Yuuki KAWATA ,  Fumiaki AOKI ,  Daisuke TANAKA ,  Ryota WAKASUGI ,  Akimitsu SUGIURA ,  Kanechiyo TERADA ,  Tetsuya MIWA

IPC分类号： H01T13/32 ,  H01T13/34

摘要： A spark plug for an internal combustion engine includes a housing, an insulator, and a center electrode. The center electrode includes an inside electrode portion and an outside electrode portion. The housing includes a ground electrode projecting from a distal end portion of the housing toward the distal end side of the plug at a part in a plug circumferential direction. The outside electrode portion projects along a surface of the insulator tip in a direction away from a boundary with the inside electrode portion and includes a projection, which is capable of causing an electrical discharge between the ground electrode and the outside electrode portion. The projection is formed in a region in the plug circumferential direction. The projection and the ground electrode are located at positions different from each other in the plug circumferential direction.

公开(公告)号：US20200036165A1

公开(公告)日：2020-01-30

申请号：US16520392

申请日：2019-07-24

申请人： DENSO CORPORATION

发明人： Ryota WAKASUGI ,  Fumiaki AOKI ,  Daisuke TANAKA ,  Akimitsu SUGIURA ,  Tetsuya MIWA ,  Kanechiyo TERADA

IPC分类号： H01T13/20

摘要： In a spark plug for an internal combustion engine, a cylindrical insulator is arranged radially inside a cylindrical ground electrode, and includes an insulator protruding portion protruding further toward a distal end side in an axial direction than a distal end of the ground electrode. A center electrode is held radially inside the insulator, and includes an exposed portion exposed from a distal end of the insulator protruding portion. The spark plug generates a discharge from the exposed portion to the ground electrode, in a discharge gap formed along a surface of the insulator protruding portion. At least one of the exposed portion and the insulator protruding portion includes a flow inlet that is open on an outer circumferential surface thereof, a flow outlet that is open toward the discharge gap, and a communication passage communicating between the flow inlet and the flow outlet.

公开(公告)号：US20200084872A1

公开(公告)日：2020-03-12

申请号：US16565910

申请日：2019-09-10

申请人： DENSO CORPORATION ,  PLASMA APPLICATIONS CO., LTD. ,  TOKYO KEIKI INC.

发明人： Daisuke TANAKA ,  Fumiaki AOKI ,  Akimitsu SUGIURA ,  Masashi KANDO ,  Jan HUSARIK ,  Hiroshi OKAJIMA

IPC分类号： H05H1/52

摘要： 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：US20180038338A1

公开(公告)日：2018-02-08

申请号：US15667923

申请日：2017-08-03

申请人： DENSO CORPORATION

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

IPC分类号： F02P15/10 ,  F02P5/15

摘要： 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

申请人： DENSO CORPORATION

发明人： Shota KINOSHITA ,  Akimitsu SUGIURA ,  Kaori DOI ,  Fumiaki AOKI

IPC分类号： F02P13/00 ,  H05H1/46

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.

公开(公告)号：US20200006925A1

公开(公告)日：2020-01-02

申请号：US16452894

申请日：2019-06-26

申请人： DENSO CORPORATION

发明人： Masahiro SHIGENAGA ,  Fumiaki AOKI ,  Akimitsu SUGIURA

IPC分类号： H01T13/32 ,  H01T13/34 ,  H01T13/06 ,  H01T13/54

摘要： A spark plug for an internal combustion engine includes a housing, an insulator, a center electrode, a ground electrode, and a plug cover. The housing has a cylindrical shape. The insulator is held on an inner side of the housing. The insulator has a cylindrical shape. The center electrode is held on an inner side of the insulator. The ground electrode forms a discharge gap with the center electrode. The plug cover, together with the housing, configures an auxiliary combustion chamber in which the discharge gap is arranged. The plug cover includes a spray hole that communicates between the inside and outside of the plug cover. The ground electrode is connected to a plurality of locations on an auxiliary-chamber inner wall surface that includes surfaces of the housing and the plug cover that are exposed to the auxiliary combustion chamber.

公开(公告)号：US20190293042A1

公开(公告)日：2019-09-26

申请号：US16441384

申请日：2019-06-14

申请人： DENSO CORPORATION

发明人： Ryota WAKASUGI ,  Akimitsu SUGIURA ,  Fumiaki AOKI

IPC分类号： F02P3/04 ,  F02P9/00

摘要： An ignition control system includes a spark plug including a cylindrical ground electrode, a cylindrical insulator having a protruding portion held inside the ground electrode and protruding toward a tip side the spark plug relative to the ground electrode, and a center electrode held inside the insulator and exposed from the insulator, an ignition coil including a primary coil and a secondary coil, and a primary current control unit performing creeping discharge control for generating a creeping discharge along a surface of the insulator, and air discharge transition control for stopping the creeping discharge occurring in the spark plug after the creeping discharge control is performed, and cutting off primary current after a discharge stop period ends, in one combustion cycle of the engine.

公开(公告)号：US20180066624A1

公开(公告)日：2018-03-08

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

CPC分类号： F02P3/055 ,  F02P3/005 ,  F02P3/01 ,  F02P5/1502 ,  F02P9/002 ,  F02P17/02 ,  F02P2017/121 ,  H01F38/12 ,  H01T15/00

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.

公开(公告)号：US20190386467A1

公开(公告)日：2019-12-19

申请号：US16551912

申请日：2019-08-27

申请人： DENSO CORPORATION

发明人： Noriaki NISHIO ,  Masamichi SHIBATA ,  Kanechiyo TERADA ,  Ken HANASHI ,  Ryohei AKIYOSHI ,  Fumiaki AOKI

IPC分类号： H01T13/32

摘要： A center electrode is held in insulating glass, in which a tip end portion of the center electrode protrudes. A ground electrode has a connection part connected to a housing. The ground electrode forms a spark discharge gap between the center electrode and the ground electrode. The ground electrode has a ground base material that includes the connection part and a ground protrusion part that protrudes from the ground base material toward the center electrode and forms the spark discharge gap between the center electrode and the ground electrode. An angle between a ground discharge surface of the ground protrusion part and a side surface of the ground protrusion part is a right angle or an acute angle. At least a portion of the side surface of the ground protrusion part and at least a portion of a side surface of the ground base material are flush with each other.