Patents by Inventor Masahiro Ishitani

Masahiro Ishitani 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: 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: 10302062
    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.
    Type: Grant
    Filed: August 18, 2017
    Date of Patent: May 28, 2019
    Assignee: DENSO CORPORATION
    Inventors: Masahiro Ishitani, Akimitsu Sugiura, Makoto Toriyama, Satoru Nakayama, Yuuki Kondou, Hisaharu Morita, Naoto Hayashi, Yuuto Tamei, Takashi Oono, Shunichi Takeda
  • Patent number: 10161376
    Abstract: An ignition control apparatus for engines is provided. The ignition control apparatus is designed to control a switch to release energy stored in a capacitor during spark discharge, thereby supplying a primary current to an other end side opposite a one end of a primary winding of an ignition coil connected to a dc power supply. This provides the ignition control apparatus which is capable of minimizing an increase in size or manufacturing cost and stabilizing the state of combustion of an air-fuel mixture.
    Type: Grant
    Filed: May 20, 2014
    Date of Patent: December 25, 2018
    Assignee: DENSO CORPORATION
    Inventors: Satoru Nakayama, Makoto Toriyama, Akimitsu Sugiura, Masahiro Ishitani, Yuuki Kondou
  • Patent number: 9995267
    Abstract: An ignition apparatus includes an adjuster. The adjuster adjusts, according to at least one of a primary voltage and a secondary voltage detected by a voltage detector, at least one of an application timing and an application level of auxiliary electrical energy to an ignition coil while main electrical energy is applied to a spark plug by the ignition coil. The application timing includes whether the auxiliary electrical energy is applied to the ignition coil.
    Type: Grant
    Filed: April 11, 2014
    Date of Patent: June 12, 2018
    Assignee: DENSO CORPORATION
    Inventors: Yuuki Kondou, Masahiro Ishitani, Satoru Nakayama, Akimitsu Sugiura, Makoto Toriyama, Takashi Oono
  • Patent number: 9897062
    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.
    Type: Grant
    Filed: November 28, 2014
    Date of Patent: February 20, 2018
    Assignee: DENSO CORPORATION
    Inventors: Satoru Nakayama, Makoto Toriyama, Akimitsu Sugiura, Masahiro Ishitani, Atsuya Mizutani, Kouji Andoh, Naoto Hayashi, Kaori Doi
  • Publication number: 20170342955
    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.
    Type: Application
    Filed: August 18, 2017
    Publication date: November 30, 2017
    Inventors: Masahiro ISHITANI, Akimitsu SUGIURA, Makoto TORIYAMA, Satoru NAKAYAMA, Yuuki KONDOU, Hisaharu MORITA, Naoto HAYASHI, Yuuto TAMEI, Takashi OONO, Shunichi TAKEDA
  • Patent number: 9822753
    Abstract: An ignition control device includes a control unit to control first to third switching elements so that during ignition discharge, which is started by turning off the first switching element, energy stored on a capacitor is discharged by turning off the third switching element and turning on the second switching element for supplying a primary current to an end of a primary winding opposite to an end thereof connected to a direct-current power supply. During inductive discharge of a spark plug, the control unit non-intermittently turns on the second switching element so that the second switching element is turned on over a successive energy input time period, according to the operating conditions of an internal combustion engine.
    Type: Grant
    Filed: July 4, 2014
    Date of Patent: November 21, 2017
    Assignee: DENSO CORPORATION
    Inventors: Masahiro Ishitani, Akimitsu Sugiura, Makoto Toriyama, Satoru Nakayama, Yuuki Kondou
  • Patent number: 9771918
    Abstract: It is possible to adjust electromagnetic energy introduced from a low-voltage side of a primary winding 20 of an ignition coil 2 after start discharging to a spark plug 1 from the ignition coil 2 in the correct proportion by threshold-determining either one or both of a primary voltage V1 applied to a primary side of the ignition coil 2 and a secondary current I2 flowing in a secondary side of the ignition coil 2, and by opening and closing a discharging switch 32 disposed between an auxiliary power supply 3 including an energy storage coil 330 and a low-voltage side terminal 201 of the ignition coil 2.
    Type: Grant
    Filed: April 11, 2014
    Date of Patent: September 26, 2017
    Assignee: DENSO CORPORATION
    Inventors: Satoru Nakayama, Makoto Toriyama, Akimitsu Sugiura, Masahiro Ishitani, Yuuki Kondou, Kanechiyo Terada
  • Patent number: 9765748
    Abstract: An ignition control device comprises: a first switching element having a power source side terminal connected to an other end side of a primary coil and a first ground side terminal connected to a ground side; a second switching element having a second ground side terminal connected to the other end side of the primary coil; a third switching element having a third power source side terminal connected to the second power source side terminal in the second switching element, and a third ground side terminal connected to the ground side; and an energy storage coil. The energy storage coil is an inductor interposed in an electric power line connecting a non-ground side output terminal in a DC power source and the third power source side terminal in the third switching element, and stores energy from the turning on of the third switching element.
    Type: Grant
    Filed: April 11, 2014
    Date of Patent: September 19, 2017
    Assignee: DENSO CORPORATION
    Inventors: Masahiro Ishitani, Akimitsu Sugiura, Makoto Toriyama, Satoru Nakayama, Yuuki Kondou, Hisaharu Morita, Naoto Hayashi, Yuuto Tamei, Takashi Oono, Shunichi Takeda
  • Publication number: 20170045025
    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.
    Type: Application
    Filed: November 28, 2014
    Publication date: February 16, 2017
    Inventors: Satoru NAKAYAMA, Makoto TORIYAMA, Akimitsu SUGIURA, Masahiro ISHITANI, Atsuya MIZUTANI, Kouji ANDOH, Naoto HAYASHI, Kaori DOI
  • Publication number: 20160146176
    Abstract: An ignition control device includes a control unit to control first to third switching elements so that during ignition discharge, which is started by turning off the first switching element, energy stored on a capacitor is discharged by turning off the third switching element and turning on the second switching element for supplying a primary current to an end of a primary winding opposite to an end thereof connected to a direct-current power supply. During inductive discharge of a spark plug, the control unit non-intermittently turns on the second switching element so that the second switching element is turned on over a successive energy input time period, according to the operating conditions of an internal combustion engine.
    Type: Application
    Filed: July 4, 2014
    Publication date: May 26, 2016
    Inventors: Masahiro ISHITANI, Akimitsu SUGIURA, Makoto TORIYAMA, Satoru NAKAYAMA, Yuuki KONDOU
  • Publication number: 20160102648
    Abstract: An ignition control apparatus for engines is provided. The ignition control apparatus is designed to control a switch to release energy stored in a capacitor during spark discharge, thereby supplying a primary current to an other end side opposite a one end of a primary winding of an ignition coil connected to a dc power supply. This provides the ignition control apparatus which is capable of minimizing an increase in size or manufacturing cost and stabilizing the state of combustion of an air-fuel mixture.
    Type: Application
    Filed: May 20, 2014
    Publication date: April 14, 2016
    Applicant: DENSO CORPORATION
    Inventors: Satoru NAKAYAMA, Makoto TORIYAMA, Akimitsu SUGIURA, Masahiro ISHITANI, Yuuki KONDOU
  • Publication number: 20160084213
    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: Application
    Filed: April 11, 2014
    Publication date: March 24, 2016
    Applicant: Denso Corporation
    Inventors: Satoru NAKAYAMA, Makoto TORIYAMA, Akimitsu SUGIURA, Masahiro ISHITANI, Yuuki KONDOU
  • Publication number: 20160084215
    Abstract: An ignition apparatus includes an adjuster. The adjuster adjusts, according to at least one of a primary voltage and a secondary voltage detected by a voltage detector, at least one of an application timing and an application level of auxiliary electrical energy to an ignition coil while main electrical energy is applied to a spark plug by the ignition coil. The application timing includes whether the auxiliary electrical energy is applied to the ignition coil.
    Type: Application
    Filed: April 11, 2014
    Publication date: March 24, 2016
    Applicant: Denso Corporation
    Inventors: Yuuki KONDOU, Masahiro ISHITANI, Satoru NAKAYAMA, Akimitsu SUGIURA, Makoto TORIYAMA, Takashi OONO
  • Publication number: 20160061177
    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.
    Type: Application
    Filed: April 11, 2014
    Publication date: March 3, 2016
    Inventors: Masahiro ISHITANI, Akimitsu SUGIURA, Makoto TORIYAMA, Satoru NAKAYAMA, Yuuki KONDOU, Hisaharu MORITA, Naoto HAYASHI, Yuuto TAMEI, Takashi OONO, Shunichi TAKEDA
  • Publication number: 20160047352
    Abstract: It is possible to adjust electromagnetic energy introduced from a low-voltage side of a primary winding 20 of an ignition coil 2 after start discharging to a spark plug 1 from the ignition coil 2 in the correct proportion by threshold-determining either one or both of a primary voltage V1 applied to a primary side of the ignition coil 2 and a secondary current I2 flowing in a secondary side of the ignition coil 2, and by opening and closing a discharging switch 32 disposed between an auxiliary power supply 3 including an energy storage coil 330 and a low-voltage side terminal 201 of the ignition coil 2.
    Type: Application
    Filed: April 11, 2014
    Publication date: February 18, 2016
    Inventors: Satoru NAKAYAMA, Makoto TORIYAMA, Akimitsu SUGIURA, Masahiro ISHITANI, Yuuki KONDOU, Kanechiyo TERADA
  • Publication number: 20080117010
    Abstract: An ignition coil includes a primary coil and a secondary coil, a magnetic member through which a magnetic flux generated by the primary coil and the secondary coil passes, a resin case for accommodating therein the magnetic member, the primary coil and the secondary coil, and an insulating resin for filling the resin case. The magnetic member is formed by compression molding of a green compact material using iron-based powder including an insulating coating. In the ignition coil, the green compact material contains 50% by weight or more of the iron-based powder having a particle size about in a range of 150 ?m to 300 ?m. Alternatively, the green compact material has a content of a binder being 0.15% by weight or less.
    Type: Application
    Filed: November 14, 2007
    Publication date: May 22, 2008
    Applicant: DENSO CORPORATION
    Inventors: Masahiro Ishitani, Katsunori Akimoto
  • Publication number: 20060027950
    Abstract: The invention provides a method for manufacturing a soft magnetic material, wherein an Fe—Si alloy powder is heated in a weakly oxidizing atmosphere to form a SiO2 oxide film on the surface, and the powder is then press-molded and fired in a weakly oxidizing atmosphere to obtain a sintered product. By performing the surface oxidizing step in a weakly oxidizing atmosphere such as water vapor, Si is selectively oxidized to form a thin oxide film with high electrical resistance. Furthermore, by firing the molded product in a weakly oxidizing atmosphere, the sintering can be performed while the oxide film, in which cracks and the like are generated at the press-molding, is repaired.
    Type: Application
    Filed: August 3, 2005
    Publication date: February 9, 2006
    Applicant: Denso Corporation
    Inventors: Masahiro Ishitani, Yoshiaki Nishijima, Yurio Nomura, Kouichi Yamaguchi, Yuichi Ishikawa, Hidekazu Hayama