Patents by Inventor Kanechiyo Terada

Kanechiyo Terada 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: 10886708
    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: Grant
    Filed: September 27, 2019
    Date of Patent: January 5, 2021
    Assignee: DENSO CORPORATION
    Inventors: Shintaro Itoh, Daisuke Tanaka, Akimitsu Sugiura, Ryota Wakasugi, Kaori Doi, Kanechiyo Terada, Tetsuya Miwa, Fumiaki Aoki
  • Patent number: 10883468
    Abstract: An ignition system includes a primary coil, a secondary coil, a first switch, a second switch, a third switch, a fourth switch, and a switch control section. The primary coil includes a first winding, and a second winding which is connected in series with the first winding. The secondary coil is connected to an ignition plug and is magnetically coupled to the primary coil. The first switch connects and disconnects an electrical path between a first terminal and a ground. The second switch connects and disconnects an electrical path between a power supply and a second terminal. The third switch connects and disconnects an electrical path between the power supply and the first terminal. The fourth switch connects and disconnects an electrical path between a contact point and the ground. The switch control section controls opening and closing of each switch to connect and disconnect the associated electrical path.
    Type: Grant
    Filed: February 28, 2020
    Date of Patent: January 5, 2021
    Assignee: DENSO CORPORATION
    Inventors: Kanechiyo Terada, Takashi Ohno, Keiko Miyake
  • Patent number: 10855057
    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: Grant
    Filed: July 24, 2019
    Date of Patent: December 1, 2020
    Assignee: DENSO CORPORATION
    Inventors: Ryota Wakasugi, Fumiaki Aoki, Daisuke Tanaka, Akimitsu Sugiura, Tetsuya Miwa, Kanechiyo Terada
  • Patent number: 10811849
    Abstract: An ignition device for generating a spark discharge at a spark plug based on a first voltage from a first supply and a second voltage from a second supply. The second voltage is higher than the first voltage. In the ignition device, a primary coil includes a center tap, a first terminal on a ground side of the center tap, and a second terminal on a first-supply side of the center tap, and a secondary coil is electromagnetically coupled to the primary coil and electrically connected to the spark plug. A first switch is configured to make or break an electrical connection between the first terminal and ground, a second switch is configured to make or break an electrical connection between the second supply and the center tap, and a third switch is configured to pass or interrupt a current from the second terminal to the first supply. A controller is configured to control an on/off state of each of the first to third switches.
    Type: Grant
    Filed: June 5, 2018
    Date of Patent: October 20, 2020
    Assignee: DENSO CORPORATION
    Inventors: Keiko Miyake, Takashi Ohno, Shunichi Takeda, Kanechiyo Terada
  • 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: 10777974
    Abstract: 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.
    Type: Grant
    Filed: August 27, 2019
    Date of Patent: September 15, 2020
    Assignee: DENSO CORPORATION
    Inventors: Noriaki Nishio, Masamichi Shibata, Kanechiyo Terada, Ken Hanashi, Ryohei Akiyoshi, Fumiaki Aoki
  • 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
  • Publication number: 20200200138
    Abstract: An ignition system includes a primary coil, a secondary coil, a first switch, a second switch, a third switch, a fourth switch, and a switch control section. The primary coil includes a first winding, and a second winding which is connected in series with the first winding. The secondary coil is connected to an ignition plug and is magnetically coupled to the primary coil. The first switch connects and disconnects an electrical path between a first terminal and a ground. The second switch connects and disconnects an electrical path between a power supply and a second terminal. The third switch connects and disconnects an electrical path between the power supply and the first terminal. The fourth switch connects and disconnects an electrical path between a contact point and the ground. The switch control section controls opening and closing of each switch to connect and disconnect the associated electrical path.
    Type: Application
    Filed: February 28, 2020
    Publication date: June 25, 2020
    Inventors: Kanechiyo TERADA, Takashi OHNO, Keiko MIYAKE
  • Publication number: 20200200139
    Abstract: An ignition device includes: a primary coil including a first winding and a second winding connected in series to the first winding; a secondary coil connected to a spark plug and magnetically coupled to the primary coil; a first switch that opens or closes the electrical path between the first terminal and the ground; a second switch that opens or closes the electrical path between the power source and the second terminal; a third switch that opens or closes the electrical path between the power source and the connection point; a fourth switch that opens or closes the electrical path between the second terminal and the ground; and a switch control unit that controls the opening and closing of each switch to open or close each electrical path.
    Type: Application
    Filed: February 28, 2020
    Publication date: June 25, 2020
    Inventors: Takashi OHNO, Keiko MIYAKE, Yasuo KAKUMAE, Kanechiyo TERADA
  • Publication number: 20200191107
    Abstract: An ignition system includes a primary coil, a secondary coil, a first switch, a second switch, a third switch, a diode, and a switch control section. In the primary coil, a power supply is connected to a contact point between a first winding and a second winding. The secondary coil is magnetically coupled to the primary coil. The first switch is connected in series with the first winding. The second switch is connected in series with the second winding on the opposite side from the contact point. The third switch is connected in series with the second switch. The diode includes an anode connected between the second switch and the third switch and a cathode connected to the contact point. The switch control section controls opening and closing of each switch.
    Type: Application
    Filed: February 25, 2020
    Publication date: June 18, 2020
    Inventors: Takashi OHNO, Keiko MIYAKE, Yasuo KAKUMAE, Kanechiyo TERADA
  • Patent number: 10619616
    Abstract: A maximum value of a discharge current from a capacitor 13, detected by a primary-side current detection means 24 disposed at a grounded end of the capacitor 13, is controlled such as not to exceed a predetermined first control value Y1. The first control value Y1 is derived based on magnetic saturation of a primary winding 3, with the control being performed by controlling the on-off state of an energy injection switching means 20. As a result, magnetic saturation of the primary winding 3 can be prevented, and the reliability of an ignition apparatus which incorporates an energy injection circuit 6 can be increased.
    Type: Grant
    Filed: April 10, 2015
    Date of Patent: April 14, 2020
    Assignee: DENSO CORPORATION
    Inventors: Takashi Oono, Shunichi Takeda, Kanechiyo Terada, Yuuto Tamei
  • 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
  • Patent number: 10612510
    Abstract: In an ignition apparatus, a controller outputs a discharge start signal instructing a start of a discharge in the spark plug, and a discharge control signal instructing control of a discharge current in the spark plug after the start of the discharge. A signal line connects between the controller and a control circuit. The discharge start signal and the discharge control signal are transferred from the controller to the control circuit via the signal line. The controller modulates, based on the plural command values, the discharge control signal such that the modulated discharge control signal includes information representing the plural command values and change timings for the respective command values. The control circuit controls, based on the discharge start signal and the modified discharge control signal, the energization circuit to thereby adjust the discharge current to each of the command values at a corresponding one of the change timings.
    Type: Grant
    Filed: October 22, 2018
    Date of Patent: April 7, 2020
    Assignee: DENSO CORPORATION
    Inventors: Keiko Miyake, Shunichi Takeda, 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: 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
  • Patent number: 10539114
    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.
    Type: Grant
    Filed: February 21, 2018
    Date of Patent: January 21, 2020
    Assignee: DENSO CORPORATION
    Inventors: Naoto Hayashi, Makoto Toriyama, Kaori Doi, Kanechiyo Terada, Kenta Kyouda, Satoru Nakayama
  • Publication number: 20190386467
    Abstract: 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.
    Type: Application
    Filed: August 27, 2019
    Publication date: December 19, 2019
    Inventors: Noriaki NISHIO, Masamichi SHIBATA, Kanechiyo TERADA, Ken HANASHI, Ryohei AKIYOSHI, Fumiaki AOKI
  • Patent number: 10508638
    Abstract: An ignition device includes an ignition coil, an ignition plug and ignition control unit. The ignition control unit includes a secondary current adjusting unit that adjusts, in each cycle, an amount of the secondary current after initiating the discharge, a discharge extension detecting unit that detects an amount of extension of the discharge, and a short determination unit that determines whether a discharge-short has occurred. The ignition control unit controls the secondary current control unit such that a first step and a second step are repeatedly executed. The first step decreases the secondary current while keeping the secondary current higher than a predetermined lower current limit, when the extension amount detected by the discharge extension detecting unit is a predetermined extension amount or more. The second step increases the secondary current when the short determination unit determines that a discharge-short has occurred.
    Type: Grant
    Filed: August 2, 2018
    Date of Patent: December 17, 2019
    Assignee: DENSO CORPORATION
    Inventors: Noriaki Nishio, Kanechiyo Terada
  • 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