Patents by Inventor Takashi Okamoto

Takashi Okamoto 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: 20090235900
    Abstract: A control device of a high-pressure fuel pump of an internal combustion engine capable of improving stability in controlling the drive of the high-pressure fuel pump by limiting the end timing of a drive signal of the high-pressure fuel pump and driving an actuator in a control effective range of the high-pressure fuel pump. The control device of the high-pressure fuel pump of the internal combustion engine has a fuel injection valve provided on a cylinder and the high-pressure fuel pump for pumping fuel to the fuel injection valve, wherein the high-pressure fuel pump comprises a pressure chamber, a plunger for pressurizing the fuel in the pressure chamber, a fuel valve provided in the pressure chamber, and the actuator for operating the fuel valve. The control device has means for calculating the drive signal of the actuator so as to realize the variable discharge of the high-pressure fuel pump.
    Type: Application
    Filed: April 20, 2009
    Publication date: September 24, 2009
    Applicant: HITACHI, LTD.
    Inventors: Takashi OKAMOTO, Hiroyuki YAMADA, Kousaku SHIMADA, Koji MATSUFUJI
  • Patent number: 7591239
    Abstract: A high-pressure fuel pump control device is capable of reducing current consumption, increasing pump durability, and promoting a rise of fuel pressure from startup. The high-pressure fuel pump control device comprises a fuel injector valve for directly injecting fuel in a common rail into a combustion chamber and a high-pressure fuel pump for feeding the fuel under pressure to the common rail. The high-pressure fuel pump comprises a pressurization chamber, a plunger for pressurizing the fuel in the pressurization chamber, a fuel passage valve disposed in the pressurization chamber, and an actuator for actuating the fuel passage valve. The control device includes a control unit for executing output control of a drive signal for the actuator to vary a discharge rate of the high-pressure fuel pump.
    Type: Grant
    Filed: November 13, 2007
    Date of Patent: September 22, 2009
    Assignee: Hitachi, Ltd.
    Inventor: Takashi Okamoto
  • Publication number: 20090188469
    Abstract: Disclosed herein is a fuel injector for an internal combustion engine, which can achieve the improved responsiveness to the target fuel pressure as well as the improved controllability even when the fuel pressure is greatly decreased. A fuel injector for an internal combustion engine: a high pressure pump 103 for pressure feeding high pressure fuel of the internal combustion engine; a fuel rail 105 for accumulating the fuel that has been pressure fed by the high pressure pump; an injection valve 106 for injecting, into a cylinder, the fuel accumulated in the fuel rail; a fuel pressure sensor 104 for detecting the pressure of the fuel that is accumulated in the fuel rail; an electromagnetic relief valve 107 for discharging the pressure accumulated fuel of the fuel rail; and an ECU 110 for controlling opening and closing of the electromagnetic relief valve 107.
    Type: Application
    Filed: January 29, 2009
    Publication date: July 30, 2009
    Applicant: HITACHI, LTD.
    Inventors: Shinsaku TSUKADA, Hideharu Ehara, Takashi Okamoto
  • Patent number: 7546832
    Abstract: A control device of a high-pressure fuel pump of an internal combustion engine capable of improving stability in controlling the drive of the high-pressure fuel pump by limiting the end timing of a drive signal of the high-pressure fuel pump and driving an actuator in a control effective range of the high-pressure fuel pump. The control device of the high-pressure fuel pump of the internal combustion engine has a fuel injection valve provided on a cylinder and the high-pressure fuel pump for pumping fuel to the fuel injection valve, wherein the high-pressure fuel pump comprises a pressure chamber, a plunger for pressurizing the fuel in the pressure chamber, a fuel valve provided in the pressure chamber, and the actuator for operating the fuel valve. The control device has means for calculating the drive signal of the actuator so as to realize the variable discharge of the high-pressure fuel pump.
    Type: Grant
    Filed: October 30, 2007
    Date of Patent: June 16, 2009
    Assignee: Hitachi, Ltd.
    Inventors: Takashi Okamoto, Hiroyuki Yamada, Kousaku Shimada, Koji Matsufuji
  • Publication number: 20090150047
    Abstract: In an internal combustion engine provided with a high-pressure fuel pump, if the discharging rate of the high-pressure fuel pump is greater than the injection quantity of fuel injected from a injector with the high-pressure fuel pump remaining uncontrollable due to failure or the like, it is probable that the fuel pressure in a common rail unintentionally rises to affect the injector. A high-pressure fuel supply apparatus is provided to solve such a problem. A high-pressure fuel supply apparatus according to the present invention is configured such that if the high-pressure fuel supply apparatus or a control apparatus thereof causes malfunction to increase the pressure in the common rail, the pressure in the common rail does not exceed pressure affecting the flow characteristic and spray characteristic of the injector after recovery from the malfunctioning state.
    Type: Application
    Filed: November 25, 2008
    Publication date: June 11, 2009
    Applicant: Hitachi, Ltd.
    Inventors: Takashi Okamoto, Shinsaku Tsukada, Hideharu Ehara, Masahiro Toyohara
  • Publication number: 20090111091
    Abstract: The invention provides a pretreatment liquid for preparing a sample for measuring a virus included in rhinorrhea or sputum by an immunoassay method using an antibody specifically binding to the virus, comprising a protease inhibitor for inhibiting an influence of a protease to the virus, as well as a virus measurement kit and a virus detection method using the specimen pretreatment liquid.
    Type: Application
    Filed: October 31, 2008
    Publication date: April 30, 2009
    Applicant: SYSMEX CORPORATION
    Inventors: Kotaro FUJIMOTO, Takashi Okamoto
  • Publication number: 20090100552
    Abstract: A plant having improved heat tolerance and/or increased growth is produced by steps of: introducing DNA into a plant cell to produce a transformed plant cell, wherein the DNA is selected from the group consisting of: (a) DNA coding for a protein consisting of the amino acid sequence represented by SEQ ID NO: 2, (b) DNA including the coding region of the nucleotide sequence represented by SEQ ID NO: 1, (c) DNA coding for a protein having an amino acid sequence represented by SEQ ID NO: 2 in which one or a few amino acids are substituted, deleted, inserted, and/or added, and being involved in growth promoting effect and heat tolerance, (d) DNA hybridizing with DNA consisting of the nucleotide sequence represented by SEQ ID NO: 1 under stringent conditions and coding for a protein which is involved in growth promoting effect and heat tolerance, and (e) DNA coding for a protein having an amino acid sequence having 90% or more identity with the amino acid sequence represented by SEQ ID NO: 2 and being involved in
    Type: Application
    Filed: January 16, 2007
    Publication date: April 16, 2009
    Inventors: Tomokazu Koshiba, Teruhiko Terakawa, Hisakazu Hasegawa, Setsuko Komatsu, Takashi Okamoto, Toshiko Furukawa, Kentaroh Shimaya
  • Publication number: 20090093942
    Abstract: A control device of a high-pressure fuel pump of an internal combustion engine capable of improving stability in controlling the drive of the high-pressure fuel pump by limiting the end timing of a drive signal of the high-pressure fuel pump and driving an actuator in a control effective range of the high-pressure fuel pump. The control device of the high-pressure fuel pump of the internal combustion engine has a fuel injection valve provided on a cylinder and the high-pressure fuel pump for pumping fuel to the fuel injection valve, wherein the high-pressure fuel pump comprises a pressure chamber, a plunger for pressurizing the fuel in the pressure chamber, a fuel valve provided in the pressure chamber, and the actuator for operating the fuel valve. The control device has means for calculating the drive signal of the actuator so as to realize the variable discharge of the high-pressure fuel pump.
    Type: Application
    Filed: October 30, 2007
    Publication date: April 9, 2009
    Inventors: Takashi Okamoto, Hiroyuki Yamada, Kousaku Shimada, Koji Matsufuji
  • Patent number: 7500848
    Abstract: A mold used in a manufacturing process of a rotor of an electric motor, the rotor including a rotor core with a plurality of magnet-retaining apertures and a plurality of permanent magnets individually retained in the magnet-retaining apertures of the rotor core, for pouring a resinous material into gaps defined between the magnet-retaining apertures and the permanent magnets. The mold includes a cavity for accommodating the rotor core at a predetermined position, with the rotor core receiving the permanent magnets individually in the magnet-retaining apertures; and a deformation inhibiting surface provided in the cavity and coming into at least local contact with an outer circumferential surface of the rotor core, during a period when the resinous material is poured into the gaps, to inhibit the bulging deformation of the outer circumferential surface.
    Type: Grant
    Filed: November 29, 2006
    Date of Patent: March 10, 2009
    Assignee: Fanuc Ltd
    Inventors: Takuya Maeda, Takashi Okamoto, Makoto Funakubo, Takeshi Tamaki
  • Publication number: 20090023345
    Abstract: An inverter (apparatus), to which two motors are connected, or a connecting structure of the inverter and the motors is made compact.
    Type: Application
    Filed: September 12, 2005
    Publication date: January 22, 2009
    Applicants: YAZAKI CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHA, KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
    Inventors: Mitsuhiro Matsumoto, Hirotaka Fukushima, Takashi Tsukamoto, Kenjiro Shiba, Tomoyuki Watanabe, Takashi Okamoto
  • Publication number: 20080314364
    Abstract: The present invention provides a high-pressure fuel pump control device of an internal combustion engine, which enables accurate fuel pressure control up to high-speed rotations using a high-pressure fuel pump having a normal-close type solenoid valve. The control device controls a pump comprising: a fluid charging passage; a fluid discharging passage; a pressurized chamber which connects the charging passage and the discharging passage; a pressing member which transfers the fluid in the pressurized chamber to the discharging passage; a discharging valve provided in the discharging passage; and a solenoid valve which opens at the time of power distribution, the solenoid valve being provided in the charging passage; wherein a standard signal for outputting an ON signal for driving the solenoid valve is provided in the compression stroke of the pump.
    Type: Application
    Filed: December 10, 2007
    Publication date: December 25, 2008
    Applicant: Hitachi, Ltd.
    Inventor: Takashi OKAMOTO
  • Publication number: 20080270007
    Abstract: An apparatus controls the quantity of fuel injection of an injector in accordance with the fuel pressure in the fuel rail of a direct injection type internal combustion engine. A reference value for controlling the injector is obtained on the basis of the difference and the fuel pressure in the fuel rail at the time of starting fuel injection out of injector.
    Type: Application
    Filed: June 30, 2008
    Publication date: October 30, 2008
    Applicant: Hitachi, Ltd.
    Inventors: Masahiro TOYOHARA, Takashi Okamoto, Michihiko Hasegawa
  • Publication number: 20080262700
    Abstract: A high-pressure fuel pump control device is capable of reducing current consumption, increasing pump durability, and promoting a rise of fuel pressure from startup. The high-pressure fuel pump control device comprises a fuel injector valve for directly injecting fuel in a common rail into a combustion chamber and a high-pressure fuel pump for feeding the fuel under pressure to the common rail. The high-pressure fuel pump comprises a pressurization chamber, a plunger for pressurizing the fuel in the pressurization chamber, a fuel passage valve disposed in the pressurization chamber, and an actuator for actuating the fuel passage valve. The control device includes a control unit for executing output control of a drive signal for the actuator to vary a discharge rate of the high-pressure fuel pump.
    Type: Application
    Filed: November 13, 2007
    Publication date: October 23, 2008
    Applicant: HITACHI, LTD.
    Inventor: Takashi OKAMOTO
  • Patent number: 7418337
    Abstract: An apparatus for controlling the quantity of fuel injection of injectors in accordance with the fuel pressure in the fuel rail of a direct injection type internal combustion engine, including a fuel injection quantity calculating section for calculating the quantity of fuel injection of the injector, a fuel discharge quantity calculating unit for calculating the quantity of fuel discharged from the high-pressure fuel pump into the fuel rail, and a difference calculating unit for calculating the difference between the quantity of fuel injected out of the injector calculated by the fuel injection quantity calculating section and the quantity of fuel discharged from the high-pressure fuel pump into the fuel rail calculated by the fuel discharge quantity calculating unit, wherein the reference value for controlling the injector is obtained on the basis of the difference and the fuel pressure in the fuel rail at the time of starting fuel injection out of injector, and the injector is controlled depending on the re
    Type: Grant
    Filed: August 7, 2007
    Date of Patent: August 26, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Masahiro Toyohara, Takashi Okamoto, Michihiko Hasegawa
  • Publication number: 20080174200
    Abstract: A method of manufacturing a rotor of an electric motor, the rotor including a laminated core of multi-layer structure formed from electromagnetic thin plates laminated in an axial direction of a rotational shaft, and a pair of end plates disposed on opposite sides in the axial direction of the laminated core, and the rotor being rotatably disposed in an inside of a stator, the method including: fitting the rotational shaft into an insertion hole formed in a center region of the end plates having elasticity in a direction of plate thickness; positioning the end plates at specified position on the rotational shaft; and abutting either one of the end plates in elastically deformed state to at least one end of the laminated core.
    Type: Application
    Filed: January 17, 2008
    Publication date: July 24, 2008
    Inventors: Takashi Okamoto, Tsuyoshi Furuya
  • Patent number: 7402356
    Abstract: A solid oxide electrolyte material comprising an electrolyte material 50 using oxygen ions as carriers as a base material and a lithium-containing compound 60 added to the base material as a sintering additive is sintered at a sintering temperature of 1300° C. or lower to produce a solid oxide electrolyte 100. This solid oxide electrolyte material can reduce the sintering temperature to extend the range of choices of components of a solid oxide fuel cell and suppress reactions between other components to reduce the manufacturing cost. This solid oxide electrolyte material further can produce a solid oxide electrolyte with sufficient denseness and high gas tightness capable of suppressing fuel leak to improve the electromotive force and output.
    Type: Grant
    Filed: November 24, 2004
    Date of Patent: July 22, 2008
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Takashi Okamoto, Shunsuke Taniguchi
  • Patent number: 7398667
    Abstract: A die cushion drive system provided with a servo motor serving as a source of drive power for a die cushion of a press machine and a power circuit with a regeneration function which regenerates energy from the servo motor and returns it to an AC power supply, whereby it is possible to power the die cushion drive system by a servo motor and return the regenerated energy of this servo motor to the power source so as to save on energy.
    Type: Grant
    Filed: November 21, 2005
    Date of Patent: July 15, 2008
    Assignee: Fanuc Ltd
    Inventors: Shunsuke Matsubara, Shinichi Horikoshi, Takashi Okamoto, Yuuichi Yamada
  • Publication number: 20080035118
    Abstract: An apparatus for controlling the quantity of fuel injection of injectors in accordance with the fuel pressure in the fuel rail of a direct injection type internal combustion engine, including a fuel injection quantity calculating section for calculating the quantity of fuel injection of the injector, a fuel discharge quantity calculating unit for calculating the quantity of fuel discharged from the high-pressure fuel pump into the fuel rail, and a difference calculating unit for calculating the difference between the quantity of fuel injected out of the injector calculated by the fuel injection quantity calculating section and the quantity of fuel discharged from the high-pressure fuel pump into the fuel rail calculated by the fuel discharge quantity calculating unit, wherein the reference value for controlling the injector is obtained on the basis of the difference and the fuel pressure in the fuel rail at the time of starting fuel injection out of injector, and the injector is controlled depending on the re
    Type: Application
    Filed: August 7, 2007
    Publication date: February 14, 2008
    Applicant: Hitachi, Ltd.
    Inventors: Masahiro TOYOHARA, Takashi Okamoto, Michihiko Hasegawa
  • Publication number: 20080030917
    Abstract: There is provided a high-pressure fuel pump drive circuit for manipulating the electric current to be passed to a solenoid coil for controlling a high-pressure pump.
    Type: Application
    Filed: August 3, 2007
    Publication date: February 7, 2008
    Applicant: Hitachi, Ltd.
    Inventors: Nobuyuki Takahashi, Takashi Okamoto, Takuya Mayuzumi
  • Patent number: 7325536
    Abstract: A high-pressure fuel pump control device is capable of reducing current consumption, increasing pump durability, and promoting a rise of fuel pressure from startup. The high-pressure fuel pump control device comprises a fuel injector valve for directly injecting fuel in a common rail into a combustion chamber and a high-pressure fuel pump for feeding the fuel under pressure to the common rail. The high-pressure fuel pump comprises a pressurization chamber, a plunger for pressurizing the fuel in the pressurization chamber, a fuel passage valve disposed in the pressurization chamber, and an actuator for actuating the fuel passage valve. The control device includes a control unit for executing output control of a drive signal for the actuator to vary a discharge rate of the high-pressure fuel pump.
    Type: Grant
    Filed: May 31, 2007
    Date of Patent: February 5, 2008
    Assignee: Hitachi, Ltd.
    Inventor: Takashi Okamoto