Patents by Inventor Takuya Mayuzumi

Takuya Mayuzumi 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: 10677184
    Abstract: An object of the invention is to provide a drive device of a fuel injection device which can increase the accuracy in an injected fuel injection amount by combining the fuel injections from a plurality of injection pulse widths. In the drive device of the fuel injection device which has a function of driving the fuel injection device such that the fuel injection is performed plural times in one combustion cycle, the fuel injection device is driven such that a fuel injection at a target opening level in which a valve element or a movable element of the fuel injection device reaches a regulation member and a fuel injection at an intermediate opening level in which the valve element does not reach the regulation member are included in the plural times of division injections performed in one combustion cycle.
    Type: Grant
    Filed: June 16, 2014
    Date of Patent: June 9, 2020
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Ryo Kusakabe, Toshihiro Aono, Motoyuki Abe, Takuya Mayuzumi, Masahiro Toyohara, Takashi Okamoto, Osamu Mukaihara, Shinji Nakagawa, Yusuke Kihara
  • Publication number: 20190218987
    Abstract: In a drive unit of a fuel injection device, an electric current is supplied to the fuel injection device by applying a high voltage to the fuel injection device from a high voltage source whose voltage is boosted to a voltage higher than a battery voltage at the time of opening a valve of the fuel injection device. Thereafter, the electric current supplied to the fuel injection device is lowered to a current value at which a valve element cannot be held in a valve open state by stopping the applying of the high voltage from the high voltage source. Thereafter, in a stage where a supply current is switched to a hold current, another high voltage is applied to the fuel injection device from the high voltage source.
    Type: Application
    Filed: March 27, 2019
    Publication date: July 18, 2019
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Ryo KUSAKABE, Motoyuki ABE, Hideharu EHARA, Tohru ISHIKAWA, Takuya MAYUZUMI, Kenji HIRAKU
  • Patent number: 10340833
    Abstract: To achieve, in a load drive device including an H-bridge circuit, miniaturization of a capacitor or/and the constituent elements of the H-bridge circuit (e.g., reduction in volume) with circuit elements, for example, switching elements included in the H-bridge circuit, being inhibited from breaking down or destroying even in a case where a load is overloaded. The invention is disclosed in which, as a solution to the achievement, first and second modes are provided as a switching mode for the switching elements 11, 12, 13, and 14 and switching is appropriately performed between the first and second modes.
    Type: Grant
    Filed: April 12, 2016
    Date of Patent: July 2, 2019
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Ming Liu, Taizo Yamawaki, Takuya Mayuzumi, Ryosuke Ishida, Yasushi Sugiyama, Goichi Ono
  • Patent number: 10280862
    Abstract: In a drive unit of a fuel injection device, an electric current is supplied to the fuel injection device by applying a high voltage to the fuel injection device from a high voltage source whose voltage is boosted to a voltage higher than a battery voltage at the time of opening a valve of the fuel injection device. Thereafter, the electric current supplied to the fuel injection device is lowered to a current value at which a valve element cannot be held in a valve open state by stopping the applying of the high voltage from the high voltage source. Thereafter, in a stage where a supply current is switched to a hold current, another high voltage is applied to the fuel injection device from the high voltage source.
    Type: Grant
    Filed: February 13, 2017
    Date of Patent: May 7, 2019
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Ryo Kusakabe, Motoyuki Abe, Hideharu Ehara, Tohru Ishikawa, Takuya Mayuzumi, Kenji Hiraku
  • Patent number: 10202925
    Abstract: According to the present invention, by providing control whereby a rising slope or a descending slope of step-up current flowing to a step-up coil is detected, and corrections are made to step-up switching control, the step-up upper and lower limit current values of the step-up circuit can be controlled within intended current threshold values regardless of constant modifications or change in characteristics due to fluctuations of the battery power supply voltage or degradation of step-up circuit elements over time; heat emission by step-up circuit elements can be kept to a minimum; and the step-up recovery time can be adjusted to a constant value regardless of the slope of the step-up current.
    Type: Grant
    Filed: January 19, 2015
    Date of Patent: February 12, 2019
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Satoshi Kojima, Takuya Mayuzumi
  • Publication number: 20180363608
    Abstract: A drive unit of a fuel injection device includes a driver circuit. The driver circuit opens and closes a valve element of the fuel injection device by supplying a drive current to the fuel injection device. The driver circuit supplies the drive current to open the valve element and sets the drive current to zero in an intermediate lift area. The intermediate lift area is an area is which a lift amount of the valve element is smaller than a maximum target lift amount.
    Type: Application
    Filed: August 23, 2018
    Publication date: December 20, 2018
    Inventors: Ryo KUSAKABE, Motoyuki ABE, Yoshihito YASUKAWA, Noriyuki MAEKAWA, Takuya MAYUZUMI, Tohru ISHIKAWA
  • Patent number: 10082117
    Abstract: A method of controlling a fuel injection device that can control a small amount of injection is provided. A fuel injection device for use in an internal combustion engine, includes: a valve body that can open and close a fuel passage, a needle that transfers a force with the valve body, and executes valve opening/closing operation, and an electromagnet that includes a coil and a magnetic core provided as a driver for driving the needle, and a cylindrical nozzle holder disposed on an outer periphery of the magnetic core and the needle, in which a current is supplied to the coil to exert a magnetic attractive force between the magnetic core and the needle to open the valve body.
    Type: Grant
    Filed: April 21, 2016
    Date of Patent: September 25, 2018
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Ryo Kusakabe, Motoyuki Abe, Yoshihito Yasukawa, Noriyuki Maekawa, Takuya Mayuzumi, Tohru Ishikawa
  • Publication number: 20180183375
    Abstract: To achieve, in a load drive device including an H-bridge circuit, miniaturization of a capacitor or/and the constituent elements of the H-bridge circuit (e.g., reduction in volume) with circuit elements, for example, switching elements included in the H-bridge circuit, being inhibited from breaking down or destroying even in a case where a load is overloaded. The invention is disclosed in which, as a solution to the achievement, first and second modes are provided as a switching mode for the switching elements 11, 12, 13, and 14 and switching is appropriately performed between the first and second modes.
    Type: Application
    Filed: April 12, 2016
    Publication date: June 28, 2018
    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Ming LIU, Taizo YAMAWAKI, Takuya MAYUZUMI, Ryosuke ISHIDA, Yasushi SUGIYAMA, Goichi ONO
  • Patent number: 10002699
    Abstract: The present invention is to provide a magnet coil drive control device that can efficiently suppress conduction noise while reducing the capacitance of a capacitor. A capacitor and an impedance element are arranged in series on the connecting line connecting the positive electrode line and the negative electrode line of a DC power supply, the connecting line between the capacitor and the impedance element is connected to one end of a magnet coil via a freewheeling diode, and the portion between the freewheeling diode and the one end of the magnet coil is connected to the positive electrode line or the negative electrode line by a switching element. Conduction noise caused by the driving current of the magnet coil can be suppressed by the impedance element, and the capacitance of the capacitor can be further reduced. Accordingly, the magnet coil drive control device can be made smaller in size.
    Type: Grant
    Filed: April 25, 2013
    Date of Patent: June 19, 2018
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Kiyoshi Aiki, Ayumu Hatanaka, Takuya Mayuzumi, Katsuya Oyama, Ryosuke Ishida, Yasushi Sugiyama
  • Patent number: 9831770
    Abstract: Downsizing of an inductor is achieved while reducing radiation noise of an inductor current. A boosting power supply unit is, for example, provided in an ECU mounted in a vehicle or the like. The boosting power supply unit has a boosting coil, a switching element and a current control unit 16. The current control unit 16 controls the switching element 12 to turn on and off by using a clock signal CK1 with a higher frequency than a pulse signal SPL in a clamping period when the inductor current flowing in the boosting coil is clamped at a preset peak setting current, and controls the switching element to turn on and off by using the pulse signal SPL in periods other than the clamping period. By controlling the switching element to turn on and off in this manner, the inductor current flowing in the boosting coil is controlled.
    Type: Grant
    Filed: June 23, 2015
    Date of Patent: November 28, 2017
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Ming Liu, Kenichi Osada, Takuya Mayuzumi, Mitsuhiko Watanabe, Goichi Ono
  • Publication number: 20170222551
    Abstract: Downsizing of an inductor is achieved while reducing radiation noise of an inductor current. A boosting power supply unit is, for example, provided in an ECU mounted in a vehicle or the like. The boosting power supply unit has a boosting coil, a switching element and a current control unit 16. The current control unit 16 controls the switching element 12 to turn on and off by using a clock signal CK1 with a higher frequency than a pulse signal SPL in a clamping period when the inductor current flowing in the boosting coil is clamped at a preset peak setting current, and controls the switching element to turn on and off by using the pulse signal SPL in periods other than the clamping period. By controlling the switching element to turn on and off in this manner, the inductor current flowing in the boosting coil is controlled.
    Type: Application
    Filed: June 23, 2015
    Publication date: August 3, 2017
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Ming LIU, Kenichi OSADA, Takuya MAYUZUMI, Mitsuhiko WATANABE, Goichi ONO
  • Patent number: 9694694
    Abstract: Provided is an in-vehicle step-down switching power supply capable of obtaining a stable output while suppressing nose in a harmful frequency band even when an input voltage decreases. The in-vehicle step-down switching power supply includes a switching frequency control unit and the switching frequency control unit includes a switching frequency range setting unit that changes a switching frequency between fa and fb and a switching frequency path setting unit that skips a frequency band from fd to fe between fa and fb, via an intermediate frequency fc between fa and fb.
    Type: Grant
    Filed: January 21, 2013
    Date of Patent: July 4, 2017
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Ayumu Hatanaka, Takuya Mayuzumi, Chihiro Sato
  • Publication number: 20170152803
    Abstract: In a drive unit of a fuel injection device, an electric current is supplied to the fuel injection device by applying a high voltage to the fuel injection device from a high voltage source whose voltage is boosted to a voltage higher than a battery voltage at the time of opening a valve of the fuel injection device. Thereafter, the electric current supplied to the fuel injection device is lowered to a current value at which a valve element cannot be held in a valve open state by stopping the applying of the high voltage from the high voltage source. Thereafter, in a stage where a supply current is switched to a hold current, another high voltage is applied to the fuel injection device from the high voltage source.
    Type: Application
    Filed: February 13, 2017
    Publication date: June 1, 2017
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: RYO KUSAKABE, Motoyuki Abe, Hideharu Ehara, Tohru Ishikawa, Takuya Mayuzumi, Kenji Hiraku
  • Patent number: 9600047
    Abstract: Disclosed is an electronic control unit capable of identifying an abnormality in a power supply voltage without narrowing the operating voltage range, and having minimal effects on cost and the circuit mounting surface area. The ECU includes a microcomputer containing an input terminal VCCin and an input terminal Vrin, a power supply IC that supplies a power supply voltage VCC to the input terminal VCCin, and as a reference-voltage-generator circuit a voltage-divider resistor and a voltage-divider resistor configuring a voltage-dividing circuit that outputs a sub-divided voltage Vc is sub-divided from the power supply voltage VCC, a capacitor coupled at one end to the input terminal Vrin and coupled on at the other end to ground, and a voltage isolation element coupled between the voltage-dividing circuit and the input terminal Vrin.
    Type: Grant
    Filed: February 1, 2013
    Date of Patent: March 21, 2017
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Yasushi Sugiyama, Takuya Mayuzumi, Ryosuke Ishida, Yasuhiko Okada, Kiyoomi Kadoya, Kenichi Hoshino
  • Patent number: 9593657
    Abstract: In a drive unit of a fuel injection device, an electric current is supplied to the fuel injection device by applying a high voltage to the fuel injection device from a high voltage source whose voltage is boosted to a voltage higher than a battery voltage at the time of opening a valve of the fuel injection device. Thereafter, the electric current supplied to the fuel injection device is lowered to a current value at which a valve element cannot be held in a valve open state by stopping the applying of the high voltage from the high voltage source. Thereafter, in a stage where a supply current is switched to a hold current, another high voltage is applied to the fuel injection device from the high voltage source.
    Type: Grant
    Filed: August 8, 2011
    Date of Patent: March 14, 2017
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Ryo Kusakabe, Motoyuki Abe, Hideharu Ehara, Tohru Ishikawa, Takuya Mayuzumi, Kenji Hiraku
  • Publication number: 20160363076
    Abstract: According to the present invention, by providing control whereby a rising slope or a descending slope of step-up current flowing to a step-up coil is detected, and corrections are made to step-up switching control, the step-up upper and lower limit current values of the step-up circuit can be controlled within intended current threshold values regardless of constant modifications or change in characteristics due to fluctuations of the battery power supply voltage or degradation of step-up circuit elements over time; heat emission by step-up circuit elements can be kept to a minimum; and the step-up recovery time can be adjusted to a constant value regardless of the slope of the step-up current.
    Type: Application
    Filed: January 19, 2015
    Publication date: December 15, 2016
    Inventors: Satoshi KOJIMA, Takuya MAYUZUMI
  • Publication number: 20160237937
    Abstract: An object of the invention is to provide a drive device of a fuel injection device which can increase the accuracy in an injected fuel injection amount by combining the fuel injections from a plurality of injection pulse widths. In the drive device of the fuel injection device which has a function of driving the fuel injection device such that the fuel injection is performed plural times in one combustion cycle, the fuel injection device is driven such that a fuel injection at a target opening level in which a valve element or a movable element of the fuel injection device reaches a regulation member and a fuel injection at an intermediate opening level in which the valve element does not reach the regulation member are included in the plural times of division injections performed in one combustion cycle.
    Type: Application
    Filed: June 16, 2014
    Publication date: August 18, 2016
    Inventors: Ryo KUSAKABE, Toshihiro AONO, Motoyuki ABE, Takuya MAYUZUMI, Masahiro TOYOHARA, Takashi OKAMOTO, Osamu MUKAIHARA, Shinji NAKAGAWA, Yusuke KIHARA
  • Publication number: 20160230722
    Abstract: A method of controlling a fuel injection device that can control a small amount of injection is provided. A fuel injection device for use in an internal combustion engine, includes: a valve body that can open and close a fuel passage, a needle that transfers a force with the valve body, and executes valve opening/closing operation, and an electromagnet that includes a coil and a magnetic core provided as a driver for driving the needle, and a cylindrical nozzle holder disposed on an outer periphery of the magnetic core and the needle, in which a current is supplied to the coil to exert a magnetic attractive force between the magnetic core and the needle to open the valve body.
    Type: Application
    Filed: April 21, 2016
    Publication date: August 11, 2016
    Inventors: Ryo KUSAKABE, Motoyuki ABE, Yoshihito YASUKAWA, Noriyuki MAEKAWA, Takuya MAYUZUMI, Tohru ISHIKAWA
  • Patent number: 9347393
    Abstract: A method of controlling a fuel injection device that can control a small amount of injection is provided. A fuel injection device for use in an internal combustion engine, includes: a valve body that can open and close a fuel passage, a needle that transfers a force with the valve body, and executes valve opening/closing operation, and an electromagnet that includes a coil and a magnetic core provided as a driver for driving the needle, and a cylindrical nozzle holder disposed on an outer periphery of the magnetic core and the needle, in which a current is supplied to the coil to exert a magnetic attractive force between the magnetic core and the needle to open the valve body.
    Type: Grant
    Filed: June 19, 2012
    Date of Patent: May 24, 2016
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Ryo Kusakabe, Motoyuki Abe, Yoshihito Yasukawa, Noriyuki Maekawa, Takuya Mayuzumi, Tohru Ishikawa
  • Patent number: 9287771
    Abstract: A capacitor connected to a microcomputer voltage wiring is downsized. A series regulator on an electronic control unit for automotive includes a battery as an in-vehicle power supply, a relay, an input side capacitor, a series regulator circuit, and an output side capacitor, and is connected to a microcomputer. The series regulator circuit includes an n-channel MOSFET, a gate voltage regulator circuit as an output control circuit of an FET, and a gate voltage holding capacitor. A capacitor GND voltage (gate voltage) is adjusted by the gate voltage regulator circuit to convert an input side capacitor voltage into an output side capacitor voltage, and supply a microcomputer current to the microcomputer.
    Type: Grant
    Filed: August 9, 2012
    Date of Patent: March 15, 2016
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Ayumu Hatanaka, Takuya Mayuzumi, Chihiro Sato, Yoshitaka Abe, Daisuke Sekine, Hirofumi Kurimoto