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: 20110100333
    Abstract: A fuel injection control apparatus for an internal combustion engine which can inject a fuel injection quantity to a fuel injector with accuracy even when the fuel injection quantity is reduced than before is provided.
    Type: Application
    Filed: August 13, 2010
    Publication date: May 5, 2011
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Masahiro TOYOHARA, Takashi Okamoto, Tomohiro Ohisa, Yoshikazu Ishii
  • Patent number: 7881035
    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: Grant
    Filed: August 3, 2007
    Date of Patent: February 1, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Nobuyuki Takahashi, Takashi Okamoto, Takuya Mayuzumi
  • Publication number: 20100233543
    Abstract: A nonaqueous secondary battery comprising a positive electrode which has a positive electrode active material layer containing Li(LixMn2xCo1-3x)O2 wherein x represents 0<x<?, and a negative electrode which has a negative electrode active material layer containing Si or Sn. The amounts of the active materials are preferably such that the ratio of the theoretical capacity of the negative electrode to the capacity of the positive electrode at a cut-off voltage in a first and subsequent charging operations is 1.1 to 3.0. The battery preferably has lithium corresponding to 9% to 50% of the theoretical capacity of the negative electrode accumulated in the negative electrode.
    Type: Application
    Filed: September 28, 2007
    Publication date: September 16, 2010
    Inventors: Koichi Numata, Takashi Okamoto, Hitohiko Ide, Yasunori Tabira, Akihiro Modeki
  • Patent number: 7757667
    Abstract: A high-pressure fuel pump of an internal combustion engine has a fuel injection valve provided on a cylinder. The high-pressure fuel pump is for pumping fuel to the fuel injection valve, and has a pressure chamber, a plunger for pressurizing the fuel in the pressure chamber, a fuel valve provided in the pressure chamber, and an actuator for operating the fuel valve. A 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. The end timing of the drive signal is limited or restricted so that an attraction force of a solenoid coil is not maintained at the bottom dead center of the plunger in case that the required discharge to the fuel pump is less than the total discharge.
    Type: Grant
    Filed: April 20, 2009
    Date of Patent: July 20, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Takashi Okamoto, Hiroyuki Yamada, Kousaku Shimada, Koji Matsufuji
  • Patent number: 7757669
    Abstract: A control device for a high-pressure fuel pump for an internal combustion engine having a solenoid valve installed as a suction valve in a fuel charging passage to a pressurized chamber. A pump suction pressure generated in the pressurized chamber in the charging stroke is exerted on the solenoid valve in a valve opening direction. The solenoid valve is closed at OFF state of an electric driving signal and opened at ON state of the electric driving signal, so that a discharging rate of the high-pressure fuel pump of variable discharge rate type is controlled by an opening and closing control of the solenoid valve.
    Type: Grant
    Filed: July 31, 2007
    Date of Patent: July 20, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Takashi Okamoto, Kenichiro Tokuo
  • Patent number: 7745690
    Abstract: It is intended to provide a transgenic nonhuman mammal well representing the pathologic conditions of human rheumatoid arthritis. A transgenic nonhuman mammal is obtained by transferring a foreign DNA, wherein a DNA selected from the group consisting of an MHC class II transcriptional activator gene, the activity domain of an MHC class II transcriptional activator gene and a variant of an MHC class II transcriptional activator gene is provided under the control of a type II collagen promoter, into a cell at the early stage of development.
    Type: Grant
    Filed: March 8, 2005
    Date of Patent: June 29, 2010
    Assignee: Nagoya Industrial Science Research Institute
    Inventors: Satoshi Kanazawa, Takashi Okamoto
  • Patent number: 7735472
    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: Grant
    Filed: November 25, 2008
    Date of Patent: June 15, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Takashi Okamoto, Shinsaku Tsukada, Hideharu Ehara, Masahiro Toyohara
  • Publication number: 20100132670
    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: January 21, 2010
    Publication date: June 3, 2010
    Applicant: Hitachi, Ltd.
    Inventor: Takashi OKAMOTO
  • Patent number: 7722372
    Abstract: A direct mounting connector includes: six independent busbars for connecting the apparatus to two auxiliary machines for three-phase alternating current; two U-pole first terminal parts, two V-pole first terminal parts and two W-pole first terminal parts The six first terminal parts are connected to the apparatus at first ends of the respective six busbars, the two first terminal parts of the same pole are arranged adjacently to each other; and two sets, each set of which consists of a second U-pole terminal part, a second V-pole terminal part and a second W-pole terminal part The six second terminal parts are connected to the two auxiliary machines at second ends of the respective six busbars, the two sets arranged adjacently to each other having a distance therebetween. Busbar parts extend between the two sets of the second terminal parts.
    Type: Grant
    Filed: September 12, 2005
    Date of Patent: May 25, 2010
    Assignees: 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: 20100082223
    Abstract: There is provided a high pressure fuel pump control system for an internal combustion engine which enables fuel pressure control with high precision without being restricted by the number of cylinders of the internal combustion engine or the number of phase sensor signals and the number of cam noses which vertically drives a plunger of a high pressure fuel pump even when a camshaft phase varies by a variable valve timing mechanism by using the high pressure fuel pump with a solenoid valve. The control system has a means which changes an effective stroke by driving the solenoid valve in the high pressure fuel pump, and has a means which changes the drive timing of the high pressure fuel pump based on a cylinder recognition value of the internal combustion engine with the cam angle detecting means as an origin.
    Type: Application
    Filed: July 30, 2009
    Publication date: April 1, 2010
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Masahiro TOYOHARA, Kazunori Kondo, Satoru Okubo, Takashi Okamoto
  • Publication number: 20100053223
    Abstract: The present invention relates to a gradation control method, for a display device, in which one frame is divided into a plurality of subframes and lighting times for pixels corresponding to the subframes are controlled based on the sum of respective light-emitting times in the subframes, so that gradations of the pixels are rendered; the frame is divided into n (positive integer) subframes (e.g., SF1? to SF4?) in each of which m (positive integer)-bit data is set and a subframe (SF5?) in which p (positive integer smaller than m)-bit data is set. As a result, increase in a data setting time can be suppressed, even if the number of subframes is increased in order to enable complicated gradation control.
    Type: Application
    Filed: February 13, 2009
    Publication date: March 4, 2010
    Applicant: Mitsubishi Electric Corporation
    Inventors: Shoji OTSUKA, Takashi Okamoto, Kazuya Maeshima
  • Publication number: 20100053450
    Abstract: There is provided a video display apparatus the display screen of which is configured by combining a plurality of video display units in each of which light emitting display elements are arranged in a matrix manner; in the video display apparatus, there is provided a luminance correction means that corrects the luminance of video data situated in a correction subject area including respective end regions, of a first video display unit and a second video display unit, that face each other, in accordance with the spacing between the first video display unit and the second video display unit; and a linear noise that is caused at a seam portion between the video display units is suppressed, whereby the image quality of a video to be displayed can be raised.
    Type: Application
    Filed: March 26, 2007
    Publication date: March 4, 2010
    Inventors: Toshiaki Hanamura, Takashi Okamoto, Hideki Aso, Kazuya Maeshima, Kenji Morimoto
  • Patent number: 7646125
    Abstract: A rotor of an electric motor, including a rotor core having a plurality of magnet-retaining apertures, a plurality of permanent magnets individually received and retained in the magnet-retaining apertures of the rotor core, and a resinous filler filling a gap defined between each magnet-retaining aperture and each permanent magnet and fixing the permanent magnets to the magnet-retaining apertures. The rotor also includes an engaging projection provided in the rotor core, the engaging projection tightly engaged with each of the permanent magnets received in the magnet-retaining apertures and temporarily holding each permanent magnet at a predetermined position in a corresponding magnet-retaining aperture, in an unfinished state of the rotor where the resinous filler is not arranged in the gap.
    Type: Grant
    Filed: December 20, 2006
    Date of Patent: January 12, 2010
    Assignee: Fanuc Ltd
    Inventors: Takashi Okamoto, Takuya Maeda, Makoto Funakubo, Takeshi Tamaki
  • Publication number: 20090308351
    Abstract: A high pressure fuel supply control system for an internal combustion engine is provided which can reduce shot-to-shot varieties in the quantity of fuel discharged by a high pressure fuel pump and fuel pressure pulsation, thereby realizing stable fuel combustion and emission performance. The fuel supply control system for an internal combustion engine includes fuel injectors provided for a common rail and a high pressure fuel pump for pressure-feeding the fuel sent out from a low-pressure fuel pump to the common rail. The high pressure fuel pump includes a pressurized chamber, a plunger for pressurizing the fuel in the pressurized chamber, a fuel passage valve provided in the pressurized chamber, and an actuator for operating the fuel passage valve. The control system has a drive signal calculation unit which calculates a drive signal for driving the actuator so as to control the discharge quantity of the high pressure fuel pump and the pressure in the common rail.
    Type: Application
    Filed: May 7, 2009
    Publication date: December 17, 2009
    Applicant: Hitachi, Ltd.
    Inventor: Takashi OKAMOTO
  • Publication number: 20090280507
    Abstract: The present invention provides a method for measuring SARS virus nucleocapsid protein (SARS-NP) using first and second antibodies both binding specifically to SARS-NP, wherein the first or second antibody is an antibody recognizing an epitope located in a region (Region C) of amino acid 283 to 422 from the N-terminus of the amino acid sequence of SARS-NP.
    Type: Application
    Filed: October 11, 2006
    Publication date: November 12, 2009
    Applicant: SYSMEX CORPORATION
    Inventors: Kotaro Fujimoto, Tadahiro Kajita, Kazuhiko Takeda, Takashi Okamoto
  • Patent number: 7610141
    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: Grant
    Filed: June 30, 2008
    Date of Patent: October 27, 2009
    Assignee: Hitachi, Ltd.
    Inventors: Masahiro Toyohara, Takashi Okamoto, Michihiko Hasegawa
  • 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