Patents by Inventor Akimitsu Sugiura

Akimitsu Sugiura has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 10811850
    Abstract: In a spark plug for an internal combustion engine, a discharge gap is formed between a central electrode and a ground electrode in an axial direction of the spark plug. An insulator of a cylindrical shape has an axial hole and an insulator front end part. The axial hole is formed in the insulator, into which the central electrode is arranged and supported. The insulator front end part projects further toward a front side of the insulator in the axial direction of the spark plug than a location of an opening part formed at a front end side of the axial hole. The discharge gasp is formed in an auxiliary combustion chamber. The outer peripheral side of the auxiliary combustion chamber is covered with the insulator front end part.
    Type: Grant
    Filed: September 25, 2019
    Date of Patent: October 20, 2020
    Assignee: DENSO CORPORATION
    Inventors: Yuuki Kawata, Fumiaki Aoki, Daisuke Tanaka, Ryota Wakasugi, Kanechiyo Terada, Tetsuya Miwa, Akimitsu Sugiura
  • Patent number: 10794354
    Abstract: In an ignition control apparatus, a control unit controls switching elements so as to supply a primary current to the other end side of a primary winding opposite to one end thereof connected to a DC power source by discharging (which is performed by turning on a second switching element stored energy from a capacitor during ignition discharge (which is started by turning off a first switching element. In particular, the control unit controls the second switching element or the third switching element so as to provide variability to the amount of stored energy discharged from the capacitor according to an operating state of an internal combustion engine.
    Type: Grant
    Filed: April 11, 2014
    Date of Patent: October 6, 2020
    Assignee: DENSO CORPORATION
    Inventors: Satoru Nakayama, Makoto Toriyama, Akimitsu Sugiura, Masahiro Ishitani, Yuuki Kondou
  • Patent number: 10772184
    Abstract: 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.
    Type: Grant
    Filed: September 10, 2019
    Date of Patent: September 8, 2020
    Assignees: DENSO CORPORATION, PLASMA APPLICATIONS CO., LTD., TOKYO KEIKI INC.
    Inventors: Daisuke Tanaka, Fumiaki Aoki, Akimitsu Sugiura, Masashi Kando, Jan Husarik, Hiroshi Okajima
  • Patent number: 10720760
    Abstract: 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.
    Type: Grant
    Filed: October 2, 2019
    Date of Patent: July 21, 2020
    Assignee: DENSO CORPORATION
    Inventors: Yuuki Kawata, Fumiaki Aoki, Daisuke Tanaka, Ryota Wakasugi, Akimitsu Sugiura, Kanechiyo Terada, Tetsuya Miwa
  • Patent number: 10718310
    Abstract: An ignition apparatus includes a plasma device, a first circuit, a second circuit, and a control unit. The plasma device produces a plasma discharge in an air-fuel mixture before an arc discharge is produced. The first circuit causes an ignition plug to start the arc discharge. The second circuit energizes a primary coil in a direction opposite to the direction of the energization by the first circuit during the arc discharge, to maintain energization of the secondary coil in the same direction as the direction of the energization started by an operation of the first circuit, to cause continuation of the arc discharge. The control unit controls operations of the first circuit, the second circuit, and the plasma device.
    Type: Grant
    Filed: August 23, 2016
    Date of Patent: July 21, 2020
    Assignees: DENSO CORPORATION, THE UNIVERSITY OF TOKYO
    Inventors: Masaaki Kono, Daisuke Tanaka, Takaaki Sato, Akimitsu Sugiura, Mitsuhiro Tsue, Shinji Nakaya
  • Patent number: 10714905
    Abstract: 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.
    Type: Grant
    Filed: June 26, 2019
    Date of Patent: July 14, 2020
    Assignee: DENSO CORPORATION
    Inventors: Masahiro Shigenaga, Fumiaki Aoki, Akimitsu Sugiura
  • Patent number: 10641230
    Abstract: An ignition apparatus of an internal combustion engine is provided with an ignition plug, an AC (alternating current) voltage application unit configured to apply AC voltage to the center electrode of the ignition plug, and an application voltage control unit that controls an operation of the AC voltage application unit. The application voltage control unit is configured to control the AC voltage application unit to apply the center electrode with a first AC voltage having an amplitude smaller than that of a required voltage of the ignition plug in a first period which is before an ignition timing, and to apply the center electrode with a second AC voltage having an amplitude smaller than that of the first AC voltage or to stop applying the center electrode with the AC voltage during a second period which is before the ignition timing after the first period has elapsed.
    Type: Grant
    Filed: January 10, 2019
    Date of Patent: May 5, 2020
    Assignee: DENSO CORPORATION
    Inventors: Ryota Wakasugi, Akimitsu Sugiura
  • Patent number: 10619617
    Abstract: An ignition device for an internal combustion engine with an ignition plug that ignites an air-fuel mixture in a combustion chamber, wherein a discharge current i provided by the ignition plug to the air-fuel mixture is controlled to be greater than a discharge current reference value ibf, which is a minimum current value at which a spark discharge blow-out phenomenon does not arise.
    Type: Grant
    Filed: February 9, 2018
    Date of Patent: April 14, 2020
    Assignees: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO, DENSO CORPORATION
    Inventors: Shogo Sayama, Ryou Masuda, Takayuki Fuyuto, Masao Kinoshita, Yoshihiro Nomura, Akimitsu Sugiura
  • Publication number: 20200112144
    Abstract: 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.
    Type: Application
    Filed: October 2, 2019
    Publication date: April 9, 2020
    Inventors: Yuuki KAWATA, Fumiaki AOKI, Daisuke TANAKA, Ryota WAKASUGI, Akimitsu SUGIURA, Kanechiyo TERADA, Tetsuya MIWA
  • Publication number: 20200099198
    Abstract: In a spark plug for an internal combustion engine, a discharge gap is formed between a central electrode and a ground electrode in an axial direction of the spark plug. An insulator of a cylindrical shape has an axial hole and an insulator front end part. The axial hole is formed in the insulator, into which the central electrode is arranged and supported. The insulator front end part projects further toward a front side of the insulator in the axial direction of the spark plug than a location of an opening part formed at a front end side of the axial hole. The discharge gasp is formed in an auxiliary combustion chamber. The outer peripheral side of the auxiliary combustion chamber is covered with the insulator front end part.
    Type: Application
    Filed: September 25, 2019
    Publication date: March 26, 2020
    Inventors: Yuuki KAWATA, Fumiaki AOKI, Daisuke TANAKA, Ryota WAKASUGI, Kanechiyo TERADA, Tetsuya MIWA, Akimitsu SUGIURA
  • Publication number: 20200084872
    Abstract: 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.
    Type: Application
    Filed: September 10, 2019
    Publication date: March 12, 2020
    Inventors: Daisuke TANAKA, Fumiaki AOKI, Akimitsu SUGIURA, Masashi KANDO, Jan HUSARIK, Hiroshi OKAJIMA
  • Publication number: 20200036165
    Abstract: 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.
    Type: Application
    Filed: July 24, 2019
    Publication date: January 30, 2020
    Inventors: Ryota WAKASUGI, Fumiaki AOKI, Daisuke TANAKA, Akimitsu SUGIURA, Tetsuya MIWA, Kanechiyo TERADA
  • Publication number: 20200028333
    Abstract: A spark plug has a tubular ground electrode, an insulator, and a center electrode. The insulator has an insulator protruding portion protruding to a tip end side in a plug axial direction with respect to the ground electrode. The center electrode 4 has an exposed portion exposed through a tip end of the insulator protruding portion. The exposed portion of the center electrode has a first part covering the insulator protruding portion from the tip end side in the plug axial direction, and a second part extending from the first part to a base end side in the plug axial direction and covering the entire circumference of an outer peripheral surface of the insulator protruding portion from an outer peripheral side in a plug radial direction.
    Type: Application
    Filed: September 27, 2019
    Publication date: January 23, 2020
    Inventors: Shintaro ITOH, Daisuke TANAKA, Akimitsu SUGIURA, Ryota WAKASUGI, Kaori DOI, Kanechiyo TERADA, Tetsuya MIWA, Fumiaki AOKl
  • Publication number: 20200011284
    Abstract: An ignition device for an internal combustion engine is provided which includes a spark plug and a controller. The spark plug has a housing with a head protruding into a combustion chamber of the engine. The head has at least a portion located downstream of a spark gap of the spark plug in an air-fuel mixture flow within the combustion chamber. The controller works to perform a plurality of discharge events in the spark plug in each cycle of an operation of the engine. This improves the ability of the spark plug to ignite the mixture without need to increase an ignition energy.
    Type: Application
    Filed: July 3, 2019
    Publication date: January 9, 2020
    Inventors: Akimitsu SUGIURA, Kaori DOI
  • Patent number: 10527020
    Abstract: 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.
    Type: Grant
    Filed: August 3, 2017
    Date of Patent: January 7, 2020
    Assignee: DENSO CORPORATION
    Inventors: Akimitsu Sugiura, Kaori Doi, Yuki Murayama, Fumiaki Aoki, Noriaki Nishio
  • Publication number: 20200006925
    Abstract: 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.
    Type: Application
    Filed: June 26, 2019
    Publication date: January 2, 2020
    Inventors: Masahiro SHIGENAGA, Fumiaki AOKI, Akimitsu SUGIURA
  • Patent number: 10508637
    Abstract: An ignition control system is applied to an internal combustion engine having an ignition coil, a switching element and a measurement detection part which detects at least one of a primary and a secondary voltages and a secondary current. The ignition coil has a primary coil and a secondary coil. The switching element performs conduction and interruption the primary current to the primary coil. The ignition control system has a primary current control unit generating a spark discharge at the ignition plug by passing the primary current through the primary coil, and perform interruption of the primary current, and a discharge short-circuiting determination part determining a generation of discharge short-circuiting based on a measured value. The primary current control unit generates the spark discharge again when discharge short-circuiting occurs.
    Type: Grant
    Filed: August 4, 2017
    Date of Patent: December 17, 2019
    Assignee: DENSO CORPORATION
    Inventors: Kaori Doi, Akimitsu Sugiura, Fumiaki Aoki, Noriaki Nishio, Yuki Murayama
  • Patent number: 10454252
    Abstract: A spark plug for an internal combustion engine is provided which has a center electrode and a ground electrode. The ground electrode includes an upright portion extending in a lengthwise direction of the spark plug and an extension bent from the upright portion in a radial direction of the spark plug. The extension has a slant surface which is shaped to be inclined away from the center electrode downstream in a flow of air-fuel mixture within a combustion chamber when the spark plug is mounted in the engine. This results in an increase in in distance by which a starting point on the ground electrode where a spark is created is moved on the slant surface, thereby increasing a length of time the spark is moved downstream and then blown out to increase the probability of successful ignition of the air-fuel mixture.
    Type: Grant
    Filed: September 27, 2018
    Date of Patent: October 22, 2019
    Assignee: DENSO CORPORATION
    Inventors: Daisuke Tanaka, Fumiaki Aoki, Akimitsu Sugiura
  • Publication number: 20190293042
    Abstract: 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.
    Type: Application
    Filed: June 14, 2019
    Publication date: September 26, 2019
    Inventors: Ryota WAKASUGI, Akimitsu SUGIURA, Fumiaki AOKI
  • Publication number: 20190271290
    Abstract: In an ignition control device for controlling operation of an ignition apparatus, an ignition section has first and second electrodes disposed in a combustion chamber of an internal combustion engine. A voltage application between the first and second electrodes enables a discharge to be generated between the first and second electrodes for igniting a gas mixture in the combustion chamber. A voltage application section performs at least one application of a determination voltage between the first and second electrodes. An occurrence ratio acquisition section acquires a discharge occurrence ratio at the ignition section for the at least one application of the determination voltage. A comparison section compares the discharge occurrence ratio acquired by the occurrence ratio acquisition section with a predetermined determination threshold to thereby determine a degree of wear of at least one of the first and second electrodes.
    Type: Application
    Filed: February 28, 2019
    Publication date: September 5, 2019
    Inventors: Ippei FUNATO, Akimitsu SUGIURA, Kanechiyo TERADA