Patents by Inventor Yoshifumi Wakisaka

Yoshifumi Wakisaka 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).

  • Publication number: 20200011237
    Abstract: The present embodiment relates to an internal combustion engine having an anodic oxide coating formed on at least a portion of an aluminum-based wall surface facing a combustion chamber. The anodic oxide coating has a plurality of nanopores extending substantially in the thickness direction of the anodic oxide coating, a first micropore extending from the surface toward the inside of the anodic oxide coating, and a second micropore present in the inside of the anodic oxide coating; the surface opening diameter of the nanopores is 0 nm or larger and smaller than 30 nm; the inside diameter of the nanopores is larger than the surface opening diameter; the film thickness of the anodic oxide coating is 15 ?m or larger and 130 ?m or smaller; and the porosity of the anodic oxide coating is 23% or more.
    Type: Application
    Filed: June 26, 2019
    Publication date: January 9, 2020
    Inventors: Naoki NISHIKAWA, Akio KAWAGUCHI, Hideo YAMASHITA, Keisuke TANAKA, Toshio HORIE, Yoshifumi WAKISAKA, Fumio SHIMIZU
  • Patent number: 10385772
    Abstract: A forming method of a thermal insulation film includes a first step of forming an anode oxidation coating film on an aluminum-based wall surface, the anode oxidation coating film including micro-pores each having a diameter of micrometer-scale and nano-pores each having a diameter of nanometer-scale; and a second step of coating a surface of the anode oxidation coating film with a sealant containing filler to seal at least part of the micro-pores and the nano-pores by the sealant so as to form the thermal insulation film.
    Type: Grant
    Filed: December 18, 2015
    Date of Patent: August 20, 2019
    Assignees: TOYOTA JIDOSHA KABUSHIKI KAISHA, KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO
    Inventors: Reona Takagishi, Naoki Nishikawa, Masaaki Tani, Toshio Horie, Fumio Shimizu, Hiroshi Hohjo, Yoshifumi Wakisaka, Masakazu Murase
  • Publication number: 20190137401
    Abstract: A stimulated Raman scattering microscope device is configured to irradiates a sample with a first optical pulse at a first repetition frequency, to irradiate the sample with a second optical pulse of an optical frequency different from an optical frequency of the first optical pulse at a second repetition frequency, and to detect optical pulses of the first repetition frequency that are included in detected light from the sample irradiated with the first optical pulse and the second optical pulse, as a detected optical pulse train. The second optical pulse is generated by dispersing predetermined optical pulses that include lights of a plurality of optical frequencies, regulating to output optical pulses of a predetermined number of different optical frequencies out of the dispersed optical pulses at the second repetition frequency, and coupling the regulated optical pulses.
    Type: Application
    Filed: February 9, 2017
    Publication date: May 9, 2019
    Applicant: THE UNIVERSITY OF TOKYO
    Inventors: Yasuyuki OZEKI, Yuta SUZUKI, Yoshifumi WAKISAKA, Keisuke GODA
  • Patent number: 9863312
    Abstract: In an internal combustion engine in which an anodic oxide film (10) is formed on part or all of a wall surface facing a combustion chamber, the anodic oxide film (10) has a thickness of 30 ?m to 170 ?m, the anodic oxide film (10) has first micropores (1a) having a micro-size diameter, nanopores having a nano-size diameter and second micropores (1b) having a micro-size diameter, the first micropores (1a) and the nanopores extending from a surface of the anodic oxide film (10) toward an inside of the anodic oxide film (10) in a thickness direction of the anodic oxide film (10) or substantially the thickness direction, the second micropores (1b) being provided inside the anodic oxide film (10), at least part of the first micropores (1a) and the nanopores are sealed with a seal (2) converted from a sealant (2), and at least part of the second micropores (1b) are not sealed.
    Type: Grant
    Filed: July 30, 2014
    Date of Patent: January 9, 2018
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Naoki Nishikawa, Hiroshi Makino, Reona Takagishi, Akio Kawaguchi, Yoshifumi Wakisaka, Fumio Shimizu, Toshio Horie
  • Patent number: 9683480
    Abstract: In a spark ignition engine, a thermal insulation thin layer is formed over a wall surface, facing an inside of a combustion chamber, of a base material forming the combustion chamber, and for a thermal conductivity ? [W/(m·K)], a thermal diffusivity ? [mm2/s], and a thickness L [?m] of the thermal insulation thin layer, L?16.7×? and L?207.4×(?)0.5 are satisfied. With such a configuration, a heat loss Q_total escaping from gas in a cylinder to the wall of the combustion chamber over all strokes can be reduced, and the thermal efficiency can be improved without inducing degradation of knocking due to an increase in an amount of heating Q_intake of the gas in the cylinder during an intake stroke.
    Type: Grant
    Filed: March 20, 2013
    Date of Patent: June 20, 2017
    Assignee: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO
    Inventors: Yoshihiro Nomura, Hidemasa Kosaka, Makoto Koike, Yoshifumi Wakisaka, Yoshihiro Hotta, Kiyomi Nakakita
  • Publication number: 20160186654
    Abstract: A forming method of a thermal insulation film includes a first step of forming an anode oxidation coating film on an aluminum-based wall surface, the anode oxidation coating film including micro-pores each having a diameter of micrometer-scale and nano-pores each having a diameter of nanometer-scale; and a second step of coating a surface of the anode oxidation coating film with a sealant containing filler to seal at least part of the micro-pores and the nano-pores by the sealant so as to form the thermal insulation film.
    Type: Application
    Filed: December 18, 2015
    Publication date: June 30, 2016
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO
    Inventors: Reona TAKAGISHI, Naoki NISHIKAWA, Masaaki TANI, Toshio HORIE, Fumio SHIMIZU, Hiroshi HOHJO, Yoshifumi WAKISAKA, Masakazu MURASE
  • Publication number: 20160177818
    Abstract: In an internal combustion engine in which an anodic oxide film (10) is formed on part or all of a wall surface facing a combustion chamber, the anodic oxide film (10) has a thickness of 30 ?m to 170 ?m, the anodic oxide film (10) has first micropores (1a) having a micro-size diameter, nanopores having a nano-size diameter and second micropores (1b) having a micro-size diameter, the first micropores (1a) and the nanopores extending from a surface of the anodic oxide film (10) toward an inside of the anodic oxide film (10) in a thickness direction of the anodic oxide film (10) or substantially the thickness direction, the second micropores (1b) being provided inside the anodic oxide film (10), at least part of the first micropores (1a) and the nanopores are sealed with a seal (2) converted from a sealant (2), and at least part of the second micropores (1b) are not sealed.
    Type: Application
    Filed: July 30, 2014
    Publication date: June 23, 2016
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Naoki NISHIKAWA, Hiroshi MAKINO, Reona TAKAGISHI, Akio KAWAGUCHI, Yoshifumi WAKISAKA, Fumio SHIMIZU, Toshio HORIE
  • Patent number: 9359946
    Abstract: An internal combustion engine having an anodic oxidation coating formed on at least a part of a wall surface that faces a combustion chamber, wherein the anodic oxidation coating has voids and nano-holes smaller than the voids; at least part of the voids are sealed with a sealant derived by converting a sealing agent; and at least a part of the nano-holes are not sealed.
    Type: Grant
    Filed: September 11, 2012
    Date of Patent: June 7, 2016
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Naoki Nishikawa, Takumi Hijii, Akio Kawaguchi, Ryouta Yatsuduka, Fumio Shimizu, Yoshifumi Wakisaka, Hidemasa Kosaka
  • Publication number: 20150354083
    Abstract: A method for forming a heat insulating film includes: a step of subjecting an aluminum alloy constituting a surface of a base material to an anodic oxidation treatment to form an anodic oxidation coating film having pores formed in the surface thereat a step of coating on the surface of the anodic oxidation coating film a sealing material that includes a silicon-based polymer solution and particles of a heat insulating material that are dispersed in the silicon-based polymer solution and are particles having an average particle diameter that is larger than an average pore diameter of the pores; and a step of drying and baking the sealing material to form a sealing coating film.
    Type: Application
    Filed: June 8, 2015
    Publication date: December 10, 2015
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Hiroki IGUMA, Akio KAWAGUCHI, Manabu TATENO, Hideo YAMASHITA, Yoshifumi WAKISAKA
  • Patent number: 8893693
    Abstract: An internal combustion engine in which an anodic oxidation coating film is formed on all or a portion of a wall that faces a combustion chamber, wherein the anodic oxidation coating film has a structure that is provided with a bonding region in which each of hollow cells forming the coating film is bonded to the adjacent hollow cells, and a nonbonding region in which three or more adjacent hollow cells are not bonded to each other, and wherein a porosity of the anodic oxidation coating film is determined by a first void present in the hollow cell and a second void that forms the nonbonding region.
    Type: Grant
    Filed: August 23, 2011
    Date of Patent: November 25, 2014
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Takumi Hijii, Naoki Nishikawa, Akio Kawaguchi, Koichi Nakata, Yoshifumi Wakisaka, Hidemasa Kosaka, Fumio Shimizu
  • Publication number: 20140245994
    Abstract: An internal combustion engine having an anodic oxidation coating formed on at least a part of a wall surface that faces a combustion chamber, wherein the anodic oxidation coating has voids and nano-holes smaller than the voids; at least part of the voids are sealed with a sealant derived by converting a sealing agent; and at least a part of the nano-holes are not sealed.
    Type: Application
    Filed: September 11, 2012
    Publication date: September 4, 2014
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Naoki Nishikawa, Takumi Hijii, Akio Kawaguchi, Ryouta Yatsuduka, Fumio Shimizu, Yoshifumi Wakisaka, Hidemasa Kosaka
  • Publication number: 20130255651
    Abstract: In a spark ignition engine, a thermal insulation thin layer is formed over a wall surface, facing an inside of a combustion chamber, of a base material forming the combustion chamber, and for a thermal conductivity ? [W/(m·K)], a thermal diffusivity ? [mm2/s], and a thickness L [?m] of the thermal insulation thin layer, L?16.7×? and L?207.4×(?)0.5 are satisfied. With such a configuration, a heat loss Q_total escaping from gas in a cylinder to the wall of the combustion chamber over all strokes can be reduced, and the thermal efficiency can be improved without inducing degradation of knocking due to an increase in an amount of heating Q_intake of the gas in the cylinder during an intake stroke.
    Type: Application
    Filed: March 20, 2013
    Publication date: October 3, 2013
    Applicant: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO
    Inventors: Yoshihiro NOMURA, Hidemasa KOSAKA, Makoto KOIKE, Yoshifumi WAKISAKA, Yoshihiro HOTTA, Kiyomi NAKAKITA
  • Publication number: 20130146041
    Abstract: An internal combustion engine in which an anodic oxidation coating film is formed on all or a portion of a wall that faces a combustion chamber, wherein the anodic oxidation coating film has a structure that is provided with a bonding region in which each of hollow cells forming the coating film is bonded to the adjacent hollow cells, and a nonbonding region in which three or more adjacent hollow cells are not bonded to each other, and wherein a porosity of the anodic oxidation coating film is determined by a first void present in the hollow cell and a second void that forms the nonbonding region.
    Type: Application
    Filed: August 23, 2011
    Publication date: June 13, 2013
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Takumi Hijii, Naoki Nishikawa, Akio Kawaguchi, Koichi Nakata, Yoshifumi Wakisaka, Hidemasa Kosaka, Fumio Shimizu
  • Patent number: 8100345
    Abstract: A needle is forced to open an injection hole by reducing a pressure of fuel in an injection control chamber to thereby inject fuel stored in a fuel storage, while the needle is forced to close the injection hole by increasing the pressure of fuel in the injection control chamber to thereby terminate injection of fuel from the injection hole. In a valve-closing stroke of the needle to close the injection hole, fuel pressure is supplied from a common accumulator to the fuel storage and the injection control chamber in such a manner that the pressure to supply fuel to the fuel storage is lower than that to supply fuel to the injection control chamber. In this way, a force acting on the needle toward the injection hole side can be increased in the valve-closing stroke, to thereby accelerate a valve-closing speed of the needle.
    Type: Grant
    Filed: July 21, 2005
    Date of Patent: January 24, 2012
    Assignees: Toyota Jidosha Kabushiki Kaisha, Denso Corporation
    Inventors: Yoshihiro Hotta, Yoshifumi Wakisaka, Kiyomi Kawamura
  • Patent number: 7784492
    Abstract: In a direction control valve, a bottom face of an insertion hole of a first movable member is at a predetermined distance from a second movable member with respect to a first axial direction when communication between a first communication switching port and a communication object port is made and communication between a second communication switching port and the communication object port is broken. The bottom face contacts and pushes the second movable member in a second axial direction opposite to the first axial direction after the first movable member moves in the second axial direction by the predetermined distance while the first and second movable members move in the second axial direction to switch a port communicating with the communication object port from the first communication switching port to the second communication switching port.
    Type: Grant
    Filed: July 28, 2006
    Date of Patent: August 31, 2010
    Assignees: Denso Corporation, Nippon Soken, Inc.
    Inventors: Yoshihisa Yamamoto, Hirokuni Tomita, Yoshihiro Hotta, Yoshifumi Wakisaka, Kiyomi Kawamura
  • Patent number: 7461634
    Abstract: A pressure boosting unit (110) is provided in each fuel injection valve of an engine (1). A pressure of fuel to be supplied to the fuel injection valve from a common rail (3) is boosted as required. An ECU (20) causes low pressure injection to be performed with the pressure boosting unit 110 being in a non-operated state, and high pressure injection to be performed with the pressure boosting unit (110) being in an operated state, and the pressure of the fuel being maintained at a boosted pressure. Based on the result, the ECU (20) corrects a fuel injection period of the fuel injection valve. Also, after the correction of the fuel injection period is completed, fuel injection is performed before the pressure of the fuel reaches the boosted pressure after the pressure boosting unit starts to be operated. Based on the result, operation starting timing of the pressure boosting unit is adjusted.
    Type: Grant
    Filed: February 24, 2005
    Date of Patent: December 9, 2008
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Yoshimasa Watanabe, Ichiro Sakata, Yoshifumi Wakisaka, Yoshihiro Hotta, Kiyomi Kawamura, Kiyomi Nakakita
  • Patent number: 7337766
    Abstract: A gas-mixture-ignition-time estimation apparatus for an internal combustion engine estimates the temperature of a premixed gas mixture for PCCI combustion (i.e., cylinder interior temperature Tg), while relating it to the angle CA, on the basis of a state quantity of the cylinder interior gas at the time of start of compression (CAin) (heat energy of the cylinder interior gas at the time of start of compression), the amount of a change in the state quantity of the cylinder interior gas attributable to compression in a compression stroke (minute piston work), and the heat generation quantity of a cool flame generated in PCCI combustion prior to autoignition (hot flame) (cool flame heat generation quantity Aqlto). A time when the cylinder interior temperature Tg reaches a predetermined autoignition start temperature Tig is estimated as an autoignition start time (Caig) of the premixed gas mixture related to PCCI combustion.
    Type: Grant
    Filed: March 24, 2005
    Date of Patent: March 4, 2008
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Shigeki Nakayama, Koji Kitano, Taro Aoyama, Ryo Hasegawa, Takashi Koyama, Kazuhisa Inagaki, Yoshifumi Wakisaka, Matsuei Ueda, Kiyomi Nakakita
  • Publication number: 20080041977
    Abstract: A needle is forced to open an injection hole by reducing a pressure of fuel in an injection control chamber to thereby inject fuel stored in a fuel storage, while the needle is forced to close the injection hole by increasing the pressure of fuel in the injection control chamber to thereby terminate injection of fuel from the injection hole. In a valve-closing stroke of the needle to close the injection hole, fuel pressure is supplied from a common accumulator to the fuel storage and the injection control chamber in such a manner that the pressure to supply fuel to the fuel storage is lower than that to supply fuel to the injection control chamber. In this way, a force acting on the needle toward the injection hole side can be increased in the valve-closing stroke, to thereby accelerate a valve-closing speed of the needle.
    Type: Application
    Filed: July 21, 2005
    Publication date: February 21, 2008
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, DENSO CORPORATION
    Inventors: Yoshihiro Hotta, Yoshifumi Wakisaka, Kiyomi Kawamura
  • Publication number: 20070169748
    Abstract: A gas-mixture-ignition-time estimation apparatus for an internal combustion engine estimates the temperature of a premixed gas mixture for PCCI combustion (i.e., cylinder interior temperature Tg), while relating it to the angle CA, on the basis of a state quantity of the cylinder interior gas at the time of start of compression (CAin) (heat energy of the cylinder interior gas at the time of start of compression), the amount of a change in the state quantity of the cylinder interior gas attributable to compression in a compression stroke (minute piston work), and the heat generation quantity of a cool flame generated in PCCI combustion prior to autoignition (hot flame) (cool flame heat generation quantity Aqlto). A time when the cylinder interior temperature Tg reaches a predetermined autoignition start temperature Tig is estimated as an autoignition start time (Caig) of the premixed gas mixture related to PCCI combustion.
    Type: Application
    Filed: March 24, 2005
    Publication date: July 26, 2007
    Applicant: Toyota Jidosha Kabushiki Kaisha
    Inventors: Shigeki Nakayama, Koji Kitano, Taro Aoyarna, Ryo Hasegawa, Takashi Koyama, Kazuhisa Inagaki, Yoshifumi Wakisaka, Matsuei Ueda, Kiyomi Nakakita
  • Publication number: 20070089710
    Abstract: A pressure boosting unit (110) is provided in each fuel injection valve of an engine (1). A pressure of fuel to be supplied to the fuel injection valve from a common rail (3) is boosted as required. An ECU (20) causes low pressure injection to be performed with the pressure boosting unit 110 being in a non-operated state, and high pressure injection to be performed with the pressure boosting unit (110) being in an operated state, and the pressure of the fuel being maintained at a boosted pressure. Based on the result, the ECU (20) corrects a fuel injection period of the fuel injection valve. Also, after the correction of the fuel injection period is completed, fuel injection is performed before the pressure of the fuel reaches the boosted pressure after the pressure boosting unit starts to be operated. Based on the result, operation starting timing of the pressure boosting unit is adjusted.
    Type: Application
    Filed: February 24, 2005
    Publication date: April 26, 2007
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yoshimasa Watanabe, Ichiro Sakata, Yoshifumi Wakisaka, Yoshihiro Hotta, Kiyomi Kawamura, Kiyomi Nakakita