Patents by Inventor Yoshikuni Sato

Yoshikuni Sato 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: 8047172
    Abstract: A plasma jet ignition plug capable of inhibiting occurrence of channeling while reducing removal of energy of plasma through a ground electrode at the time of emission of plasma. A ground electrode of a plasma jet ignition plug projects inward from a front end face of a metallic shell toward an opening end of a cavity which is open at a front end face of an insulator. A projecting distal end which forms a spark discharge gap between the same and a center electrode within a cavity is located inward, with respect to a diametral direction P orthogonal to an axis O, of a position which is located 0.5 mm radially outward from the opening end of the cavity.
    Type: Grant
    Filed: February 5, 2009
    Date of Patent: November 1, 2011
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Toru Nakamura, Yuichi Yamada, Iwao Kunitomo, Yoshikuni Sato, Daisuke Nakano
  • Publication number: 20110254429
    Abstract: A plasma jet spark plug capable of preventing a channeling progress and having excellent heat conduction. The plasma jet spark plug comprised of: a ceramic insulator having a small diameter portion which assumes a linear shape in an axial direction, and a center electrode has an outer diameter increasing in the order of a frontmost portion, a step portion, a front end portion and a body portion.
    Type: Application
    Filed: December 22, 2009
    Publication date: October 20, 2011
    Inventors: Hiroyuki Kameda, Yoshikuni Sato, Daisuke Nakano, Naofumi Yamamura, Daisuke Kasahara
  • Publication number: 20110241523
    Abstract: A plasma jet ignition plug having high ignition performance and high durability. The plasma jet ignition plug comprises a center electrode wherein at least a front end portion including a front end surface of the center electrode contains an oxide of at least one of the rare earth elements in a total amount of 0.5% by mass to 10% by mass inclusive and tungsten (W) in an amount of 90% by mass or greater, or contains iridium (Ir) in an amount of 0.3% by mass to 3% by mass inclusive and W in an amount of 97% by mass or greater.
    Type: Application
    Filed: March 31, 2011
    Publication date: October 6, 2011
    Inventors: Hiroyuki Kameda, Yoshikuni Sato, Daisuke Nakano, Naofumi Yamamura, Daisuke Kasahara
  • Publication number: 20110221327
    Abstract: A plasma jet ignition plug including an insulator having an axial hole extending therethrough in the direction of an axis CL1, a center electrode inserted into the axial hole, and a ground electrode disposed frontward of the front end of the insulator. The insulator has a cavity defined by the wall surface of the axial hole and the front end surface of the center electrode and opens frontward. The ground electrode has a through hole for establishing communication between the cavity and an ambient atmosphere. A front end portion of the center electrode is formed into a taper portion whose diameter reduces frontward in the direction of the axis CL1. The outside diameter of a front end of the taper portion is smaller than the diameter of the through hole. The cavity has a substantially constant diameter with respect to the direction of the axis CL1.
    Type: Application
    Filed: March 2, 2011
    Publication date: September 15, 2011
    Inventors: Hiroyuki Kameda, Yoshikuni Sato, Daisuke Nakano, Naofumi Yamamura, Daisuke Kasahara
  • Patent number: 8017080
    Abstract: A liquid state detecting apparatus including a detecting element having a heating resistor which generates heat when energized and being disposed in a liquid container for containing a liquid, the apparatus calculating a first difference between a first corresponding value corresponding to a first resistance of the heating resistor acquired after energization of the heating resistor is started and a second corresponding value corresponding to a second resistance of the heating resistor acquired after the heating resistor is energized for a predetermined detection time and obtaining a first concentration of a particular component included in the liquid, the first concentration being associated with the first difference, the apparatus including: an abnormality determination unit, a determination concentration acquiring unit, a concentration difference calculation unit, and a static state determination unit, all as defined herein.
    Type: Grant
    Filed: November 9, 2006
    Date of Patent: September 13, 2011
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Takeo Sasanuma, Yoshikuni Sato
  • Publication number: 20110215704
    Abstract: A plasma jet spark plug for igniting an air-fuel mixture in a conventional combustion device such as an internal combustion engine.
    Type: Application
    Filed: March 4, 2011
    Publication date: September 8, 2011
    Inventors: Hiroyuki KAMEDA, Yoshikuni SATO, Daisuke NAKANO, Naofumi YAMAMURA, Daisuke KASAHARA
  • Patent number: 7959863
    Abstract: A liquid state detecting sensor for detecting a state of a liquid including a liquid concentration detecting element, a holder member, and an enclosing member as defined herein, wherein the holder member has a configuration in which respective portions of a lower end surface facing the enclosed region are located higher than or at a same height as a lowest hole periphery at the rim of the element holding hole from which the detecting element protrudes, and at least one of circulation holes formed in the enclosing member is a bubble-discharging hole which has an upper end located higher than the lowest hole periphery and a lower end located lower than a surface peripheral edge of the lower end surface.
    Type: Grant
    Filed: August 7, 2007
    Date of Patent: June 14, 2011
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Takashi Yamamoto, Yoshikuni Sato, Takeo Sasanuma, Akihiro Yoshida
  • Patent number: 7895994
    Abstract: An ignition device for a plasma jet ignition plug is provided. A resistance for decreasing electric noises is not incorporated in a plasma jet ignition plug. A resistance of not less than 1K? and not more than 20K? is provided to a path from a spark discharge circuit to a center electrode, thus reducing the generation of electric noises at the time of trigger discharge. Along with the reduction of the generation of electric noises, a loss of energy at the time of plasma discharge can be reduced by setting an inner resistance provided to a line extending to the center electrode from a plasma discharge circuit to 1? or less. Accordingly, the plasma jet ignition plug can jet flame-shaped plasma sufficiently large for igniting an air-fuel mixture.
    Type: Grant
    Filed: March 20, 2009
    Date of Patent: March 1, 2011
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Yuichi Yamada, Daisuke Nakano, Toru Nakamura, Yoshikuni Sato
  • Publication number: 20100259172
    Abstract: A plasma jet ignition plug including a wire-wound resistor for restraining the radiation of noise while allowing application of a sufficiently large current for generation of plasma to a spark discharge gap at the time of ignition. The wire-wound resistor having an inductance of 1 ?H to 100 ?H inclusive and a resistance of 1? or less, and is provided on at least one of a center electrode and a ground electrode. The wire-wound resistor restrains current which is generated by the influence of stray capacitance present in the plasma jet ignition plug, thereby reducing noise.
    Type: Application
    Filed: March 30, 2010
    Publication date: October 14, 2010
    Inventors: Daisuke Nakano, Yoshikuni Sato, Hiroyuki Kameda, Naohumi Yamamura, Daisuke Kasahara
  • Patent number: 7735354
    Abstract: A liquid-condition detection sensor (1) including a sensor element (51), at least a portion of which contacts a urea aqueous solution; connection terminals (52) fixedly attached to the sensor element (51); connection cables (53) which electrically communicate with the concentration sensor element (51) via the connection terminals (52); an inner tube (42) which holds the concentration sensor element (51) at a distal end portion (421) by use of a holder member (55) and surrounds a portion of the connection cables (53) and the entire connection terminals (52); and a separator formed from a material having rubberlike elasticity (54) including a terminal-inner-tube-insulating portion (542) which intervenes between the connection terminals (52) and the inner tube (42) to thereby insulate the connection terminals (52) and the inner rube (42) from one another.
    Type: Grant
    Filed: January 16, 2007
    Date of Patent: June 15, 2010
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Takashi Yamamoto, Takeo Sasanuma, Yoshikuni Sato
  • Publication number: 20100132666
    Abstract: A control system for controlling the ignition of a plasma-jet spark plug provided in an internal combustion engine senses an operating condition of the internal combustion engine, and determines an ignition mode of the plasma-jet spark plug in accordance with the sensed operating condition. The control system performs an ignition control of breaking down the insulation across a spark discharge gap by applying a first electric power to the plasma-jet spark plug, and producing plasma in the vicinity of the spark discharge gap by applying a second electric power to the spark discharge gap in a state of dielectric breakdown. The control system performs this ignition control according to the ignition mode determined as mentioned above.
    Type: Application
    Filed: January 8, 2009
    Publication date: June 3, 2010
    Inventors: Yoshikuni Sato, Daisuke Nakano, Yuichi Yamada, Toru Nakamura
  • Patent number: 7712363
    Abstract: A liquid state detecting sensor is provided in which a level detecting unit for detecting the level of a liquid and a concentration detecting unit for detecting the concentration of a particular component contained in the liquid are integrated. In a liquid state detecting sensor 100 capable of measuring the level and a urea concentration of a urea aqueous solution, a level detecting unit 70 and a liquid property detecting unit 30 are connected in an insulated state. An outer cylinder electrode 10 and an inner electrode 20 for forming the level detecting unit 70 form a capacitor, and level detection is performed on the basis of the electrostatic capacity which changes in response to the level of the urea aqueous solution which is present therebetween. A holder 120 for holding a ceramic heater 110 is fitted to a leading end portion 21 of the inner electrode 20, and the holder 120 is supported inside a leading end portion 11 of the outer cylinder electrode 10 by a rubber bushing 80.
    Type: Grant
    Filed: June 30, 2006
    Date of Patent: May 11, 2010
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Takeo Sasanuma, Yoshikuni Sato, Takashi Yamamoto
  • Publication number: 20100101307
    Abstract: A sensor for detecting a state of liquid contained in a container comprising an outer tubular electrode made of an electrically conductive material, an inner electrode made of an electrically conductive material and disposed concentrically within the outer tubular electrode, a base end support member supporting base end portions of the outer tubular electrode and the inner electrode in a way as to provide insulation therebetween, and a leading end support member elastically supporting a leading end portion of the inner electrode on an inside of a leading end portion of the outer tubular electrode.
    Type: Application
    Filed: January 4, 2010
    Publication date: April 29, 2010
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Yoshikuni Sato, Takashi Yamamoto, Takeo Sasanuma, Yuki Mizuno
  • Patent number: 7665347
    Abstract: A liquid state detecting apparatus including a detecting element which outputs a signal associated with a concentration of a particular component of a liquid contained in a liquid container; an abnormality determination unit which determines whether or not the liquid is in a particular abnormal state based on the output signal of the detecting element, a level detecting part which outputs a signal according to a level of the liquid contained in the liquid container; and a static state determination unit which determines whether or not the liquid in the liquid container is in a static state based on the output signal from the level detecting part, wherein the determination made by the static state determination unit is reflected in the determination made by the abnormality determination unit.
    Type: Grant
    Filed: November 9, 2006
    Date of Patent: February 23, 2010
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Takeo Sasanuma, Yoshikuni Sato
  • Patent number: 7637148
    Abstract: A liquid state detecting sensor includes: a state detecting element including a heating resistor; an energization unit; a first output acquiring unit; a reference acquiring unit; a first calculating unit; a state detecting unit; a second output acquiring unit; a second calculating unit; an excess-temperature-rise determining unit; and an energization terminating unit. The energization termination unit terminates energizing of the heating resistor by the energization unit before the end of a detection time period in response to a determination by the excessive-temperature-rise determining unit that an excessive temperature rise has occurred in the state detecting element.
    Type: Grant
    Filed: January 14, 2008
    Date of Patent: December 29, 2009
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Takeo Sasanuma, Yoshikuni Sato, Takashi Yamomoto, Hisashi Sasaki
  • Publication number: 20090302733
    Abstract: A spark plug having a center electrode; an insulator having an axial hole extending in the direction of an axis; a metallic shell; a ground electrode extending from a front end portion of the metallic shell; a center-electrode-side noble metal chip joined to a distal end surface of the center electrode; and a ground-electrode-side noble metal chip joined to a distal end surface of the ground electrode, the ground-electrode-side noble metal chip having a distal end surface facing toward a side surface portion of the center-electrode-side noble metal chip, and the ground electrode being bent at an angle that falls within a range of 120° to 140° inclusive.
    Type: Application
    Filed: May 29, 2009
    Publication date: December 10, 2009
    Inventors: Kenji Nunome, Yoshikuni Sato
  • Publication number: 20090289540
    Abstract: A spark plug comprising a center electrode, a first noble metal tip joined to the center electrode, an insulator, a metallic shell, a ground electrode joined to the metallic shell and including an outer layer and an inner layer, and a second noble metal tip joined to the ground electrode by way of a melted portion, wherein in a cross section of the ground electrode, the protrusion height A of the second noble metal tip is 0.4 mm or more, the ground electrode includes a substantially flat joining surface to which the second noble metal tip is joined and an outwardly curved surface, the inner layer has at the joining surface side a substantially flat surface or recessed surface, and the minimum distance F between the melted portion and the inner layer is 0.1 mm or more.
    Type: Application
    Filed: April 17, 2008
    Publication date: November 26, 2009
    Applicant: NGK SPARK PLUG CO., LTD
    Inventors: Kenji Nunome, Yoshikuni Sato
  • Publication number: 20090235889
    Abstract: An ignition device for a plasma jet ignition plug is provided. A resistance for decreasing electric noises is not incorporated in a plasma jet ignition plug. A resistance of not less than 1 K? and not more than 20 K? is provided to a path from a spark discharge circuit to a center electrode, thus reducing the generation of electric noises at the time of trigger discharge. Along with the reduction of the generation of electric noises, a loss of energy at the time of plasma discharge can be reduced by setting an inner resistance provided to a line extending to the center electrode from a plasma discharge circuit to 1? or less. Accordingly, the plasma jet ignition plug can jet flame-shaped plasma sufficiently large for igniting an air-fuel mixture.
    Type: Application
    Filed: March 20, 2009
    Publication date: September 24, 2009
    Inventors: Yuichi Yamada, Daisuke Nakano, Toru Nakamura, Yoshikuni Sato
  • Patent number: 7574900
    Abstract: A liquid state detection sensor in which temperature information of a urea aqueous solution is obtained on the basis of a voltage value acquired after the start of energization of a heating resistor corresponding to a resistance value of the heating resistor (S1-S6). Damage to the heating resistor is prevented by suspending the energization if the thus-obtained temperature is lower than or equal to the freezing point (S7: yes and S8). If the temperature is higher than the freezing point (S7: no), a voltage value corresponding to a resistance of the heating resistor after a lapse of 700 ms (S10 and S11) and a urea concentration of the urea aqueous solution are determined from a difference ?V from the previously acquired voltage value. A more accurate urea concentration can be detected by making a correction using the previously obtained temperature information of the urea aqueous solution (S13-S18).
    Type: Grant
    Filed: July 7, 2006
    Date of Patent: August 18, 2009
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Takeo Sasanuma, Yoshikuni Sato, Shunsuke Tamura, Shinji Kumazawa, Hisashi Sasaki
  • Publication number: 20090194053
    Abstract: A plasma jet ignition plug capable of inhibiting occurrence of channeling while reducing removal of energy of plasma through a ground electrode at the time of emission of plasma. A ground electrode of a plasma jet ignition plug projects inward from a front end face of a metallic shell toward an opening end of a cavity which is open at a front end face of an insulator. A projecting distal end which forms a spark discharge gap between the same and a center electrode within a cavity is located inward, with respect to a diametral direction P orthogonal to an axis O, of a position which is located 0.5 mm radially outward from the opening end of the cavity.
    Type: Application
    Filed: February 5, 2009
    Publication date: August 6, 2009
    Inventors: Toru Nakamura, Yuichi Yamada, Iwao Kunitomo, Yoshikuni Sato, Daisuke Nakano