Patents by Inventor Akiyasu Miyamoto

Akiyasu Miyamoto 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: 20210102520
    Abstract: Provided is a fuel injection valve capable of stroking a valve body in two stages of large and small strokes and improving responsiveness of a valve opening operation. Therefore, a first mover 201 is attracted to a magnetic core 107. A second mover 202 is formed separately from the first mover 201, and is attracted to the magnetic core 107 on an inner diameter side of the first mover 201. A valve body 101 has a flange portion 101a on an upstream side of the second mover 202. A spacer 213 forms a gap (void g1) in an axial direction between the flange portion 101a and the second mover 202 in a valve closed state.
    Type: Application
    Filed: January 24, 2019
    Publication date: April 8, 2021
    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Akiyasu MIYAMOTO, Masashi SUGAYA, Yasuo NAMAIZAWA, Takuya WATAI
  • Patent number: 10961935
    Abstract: A drive device capable of detecting individual variations of an injection quantity of a fuel injection device of each cylinder and adjusting a current waveform provided to an injection pulse width and a solenoid such that the individual variations of the fuel injection devices are reduced. The fuel injection device in the present invention includes a valve body that close a fuel passage by coming into contact with a valve seat and opens the fuel passage by separating from the valve seat and a magnetic circuit constructed of a solenoid, a fixed core, a nozzle holder a housing and a needle and when a current is supplied to the solenoid a magnetic suction force acts on the needle and the needle has a function to open the valve body by colliding against the valve body after performing a free running operation and changes of acceleration of the needle due to collision of the needle against the valve body are detected by a current flowing through the solenoid.
    Type: Grant
    Filed: February 8, 2018
    Date of Patent: March 30, 2021
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Ryo Kusakabe, Motoyuki Abe, Ayumu Hatanaka, Toshihiro Aono, Teppei Hirotsu, Hideyuki Sakamoto, Masahiro Toyohara, Osamu Mukaihara, Takao Fukuda, Yoshihito Yasukawa, Akiyasu Miyamoto
  • Patent number: 10883434
    Abstract: An object is to suppress an inclination of a waveform indicating an injection quantity with respect to an injection pulse particularly when a lift amount of a valve body is small and an injection pulse width is short, thereby improving control accuracy of the injection quantity of a fuel injection device. Thus, a control device for controlling a fuel injection device, which includes a valve body, a solenoid, and a movable element to open the valve body, is provided with a control unit that controls a drive voltage or a drive current to be applied to the solenoid, in which the control unit controls the drive current such that the drive current to be supplied to the solenoid decreases from a maximum drive current after the maximum drive current is supplied to the solenoid and before the valve body starts to open.
    Type: Grant
    Filed: July 7, 2017
    Date of Patent: January 5, 2021
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Takao Miyake, Akiyasu Miyamoto, Takatoshi Iizuka, Kiyotaka Ogura
  • Patent number: 10883461
    Abstract: Electromagnetic solenoid has movable core having end surface that is formed between inner circumferential surface and outer circumferential surface of movable core; and fixed core having end surface that is formed between inner circumferential surface and outer circumferential surface of fixed core and faces the end surface of movable core. Ring-shaped protruding portion is formed at least either one of the end surface of the movable core or the end surface of the fixed core. Protruding portion is provided at a position that is shifted to a radially inner circumferential side of the end surface. A length between apex and inner circumferential edge of protruding portion is shorter than a length between the apex and an outer circumferential edge of protruding portion.
    Type: Grant
    Filed: February 16, 2017
    Date of Patent: January 5, 2021
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Akihiro Yamazaki, Takahiro Saito, Nobuaki Kobayashi, Akiyasu Miyamoto, Yoshihito Yasukawa
  • Patent number: 10823102
    Abstract: A control device for a fuel injection valve including a variable lift mechanism of two or more stages is provided. The control device includes an inflection point detection unit for detecting an inflection point from at least one of a drive current when the fuel injection valve is opened or a drive voltage when the fuel injection valve is closed. The control device also includes a drive sensing unit for sensing a drive lift of the fuel injection valve from at least one of an inflection point of a drive current during valve opening operation or a drive voltage during valve closing operation. The control device is configured to limit the command drive lift when the sensed drive lift is different from a command drive lift.
    Type: Grant
    Filed: March 6, 2018
    Date of Patent: November 3, 2020
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Fumihiro Itaba, Osamu Mukaihara, Akiyasu Miyamoto, Akira Iizuka
  • Patent number: 10815949
    Abstract: Provided is a structure capable of reducing dribbling of fuel generated when a valve body is closed. In order to achieve the above object, a fuel injection device includes: a valve body; and a seat member having a seat portion on which the valve body is seated and having a fuel injection hole formed on a downstream side of the seat portion. The seat member is formed such that a gap between the seat member and the opposing valve body in the whole region on the downstream side of the fuel injection hole is smaller than a diameter of the fuel injection hole.
    Type: Grant
    Filed: April 13, 2017
    Date of Patent: October 27, 2020
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Yoshihito Yasukawa, Kiyotaka Ogura, Takao Miyake, Akira Iizuka, Kazuki Yoshimura, Akiyasu Miyamoto
  • Publication number: 20200291910
    Abstract: Provided is a fuel injection valve capable of quickly stopping a position of a movable element at a predetermined position after closing a valve while reducing an impact force of a valve body. Therefore, a valve body 101 includes a sleeve 113. A first movable core 201 (first movable element) lifts the valve body 101 by the attractive force of a magnetic core 107. A second movable core 202 (second movable element) further lifts the valve body 101 by the attractive force of the magnetic core 107 after the first movable core 201 (first movable element) lifts the valve body 101. After the valve body 101 is seated on the seat member 102 and the second movable core 202 (second movable element) is separated from the sleeve 113, a bottom surface 201g of the first movable core 201 (first movable element) collides with a storage bottom surface 111b (collision receiving portion).
    Type: Application
    Filed: September 28, 2018
    Publication date: September 17, 2020
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Akiyasu MIYAMOTO, Yasuo NAMAIZAWA, Takao MIYAKE, Takuya WATAI
  • Patent number: 10704516
    Abstract: The present invention includes a valve seat and a valve body that cooperatively open/close a fuel passage, a movable element having the valve body provided at one end part thereof and a movable iron core 27a provided at the other end part thereof, a fixed iron core 25 which faces the movable iron core 27a and which attracts the movable iron core 27a by applying a magnetic attraction force thereto, and a cylindrical member that includes thereinside the fixed iron core 25 and the movable iron core 27a. The fixed iron core 25 includes a reduced-diameter part 25m on an outer circumferential surface at the side facing the movable iron core 27a, and the movable iron core 27a includes a reduced-diameter part 27am on an outer circumferential surface at the side facing the fixed iron core 25.
    Type: Grant
    Filed: August 2, 2016
    Date of Patent: July 7, 2020
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Akihiro Yamazaki, Takahiro Saito, Nobuaki Kobayashi, Akiyasu Miyamoto
  • Patent number: 10662886
    Abstract: A control device of a fuel injection device improves stabilization in an opening operation of a valve element and stabilizes an injection amount. The control device includes a valve element to open a fuel passage by being separated from a valve seat, a movable iron core to perform an opening/closing operation of the valve element, and a fixed iron core to attract the movable iron core when a current flows to a coil. The control device includes a control unit which performs an intermediate energization in which the coil is energized again to attract the movable iron core to the fixed iron core and then the energizing to the coil is blocked and the movable iron core is displaced in a direction away from the fixed core. The control unit controls whether the intermediate energization is performed according to an injection interval of the fuel injection device.
    Type: Grant
    Filed: December 22, 2016
    Date of Patent: May 26, 2020
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Akiyasu Miyamoto, Masahiro Toyohara, Osamu Mukaihara, Yoshihito Yasukawa
  • Publication number: 20200088123
    Abstract: In a fuel injection valve including a variable lift mechanism of two or more stages, when fuel is injected with a lift different from a command, exhaust emission deterioration and torque fluctuations may occur. A control device for a fuel injection valve including a variable lift mechanism of two or more stages is provided, which senses a drive lift of the fuel injection valve from an inflection point of a drive current during valve opening operation or a drive voltage during valve closing operation, and limits the command drive lift when the sensed drive lift is different from a command drive lift.
    Type: Application
    Filed: March 6, 2018
    Publication date: March 19, 2020
    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Fumihiro ITABA, Osamu MUKAIHARA, Akiyasu MIYAMOTO, Akira IIZUKA
  • Publication number: 20190249631
    Abstract: Provided is a fuel injection valve capable of stroking a valve body in large and small two stages and capable of precisely controlling an injection flow rate at the stroke. Therefore, the fuel injection valve of the present invention is provided with a valve body for opening or closing a flow path, a movable element for driving the valve body in a valve opening direction, and a magnetic core for attracting the movable element, in which the movable element is separately configured from the valve body, and is configured by a first movable element having a first facing surface facing the magnetic core and having the first facing surface attracted by the magnetic core, and a second movable element separately configured from the first movable element, having a second facing surface facing the magnetic core, and having the second facing surface attracted by the magnetic core.
    Type: Application
    Filed: July 12, 2017
    Publication date: August 15, 2019
    Inventors: Akiyasu MIYAMOTO, Kiyotaka OGURA, Atsushi HOHKITA, Yuto ISHIZUKA, Takao MIYAKE
  • Patent number: 10378496
    Abstract: An object of the present invention is to provide a fuel injection valve configured to suppress bouncing of a valve element that is caused as a result of the valve element being rendered elastic when the valve element collides with a valve seat. The fuel injection valve of the present invention includes the valve element configured to come into contact with the valve seat for closing an injection hole and to separate from the valve seat for unclosing the injection hole, an elastic member urging the valve element toward the valve seat, a movable iron core disposed to be in and out of contact with the valve element, a fixed iron core disposed to be opposed to the movable iron core, and a coil configured to generate electromagnetic force for moving the movable iron core.
    Type: Grant
    Filed: January 8, 2016
    Date of Patent: August 13, 2019
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Akiyasu Miyamoto, Motoyuki Abe, Yoshihito Yasukawa, Takao Miyake, Akira Iizuka, Kiyotaka Ogura
  • Publication number: 20190211767
    Abstract: An object is to suppress an inclination of a waveform indicating an injection quantity with respect to an injection pulse particularly when a lift amount of a valve body is small and an injection pulse width is short, thereby improving control accuracy of the injection quantity of a fuel injection device. Thus, a control device for controlling a fuel injection device, which includes a valve body, a solenoid, and a movable element to open the valve body, is provided with a control unit that controls a drive voltage or a drive current to be applied to the solenoid, in which the control unit controls the drive current such that the drive current to be supplied to the solenoid decreases from a maximum drive current after the maximum drive current is supplied to the solenoid and before the valve body starts to open.
    Type: Application
    Filed: July 7, 2017
    Publication date: July 11, 2019
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Takao MIYAKE, Akiyasu MIYAMOTO, Takatoshi IIZUKA, Kiyotaka OGURA
  • Publication number: 20190211791
    Abstract: Provided is a structure capable of reducing dribbling of fuel generated when a valve body is closed. In order to achieve the above object, a fuel injection device includes: a valve body; and a seat member having a seat portion on which the valve body is seated and having a fuel injection hole formed on a downstream side of the seat portion. The seat member is formed such that a gap between the seat member and the opposing valve body in the whole region on the downstream side of the fuel injection hole is smaller than a diameter of the fuel injection hole.
    Type: Application
    Filed: April 13, 2017
    Publication date: July 11, 2019
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Yoshihito YASUKAWA, Kiyotaka OGURA, Takao MIYAKE, Akira IIZUKA, Kazuki YOSHIMURA, Akiyasu MIYAMOTO
  • Patent number: 10288022
    Abstract: In an electromagnetic fuel injection which is structured such that both end surfaces of an inner circumferential iron core portion and an outer circumferential iron core portion face a movable iron core, and a non-magnetic portion made of a metal material is provided between both end surfaces, an object of the present invention is to realize a structure of the electromagnetic fuel injector in which a surface of a target object is unlikely to be affected by a heat treatment with the surface facing the movable iron core.
    Type: Grant
    Filed: January 27, 2014
    Date of Patent: May 14, 2019
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Yoshihito Yasukawa, Hideharu Ehara, Tohru Ishikawa, Kiyotaka Ogura, Motoyuki Abe, Ryo Kusakabe, Akiyasu Miyamoto
  • Patent number: 10267283
    Abstract: A solenoid valve provided with a valve element that abuts against and separates from a valve seat to seal fuel; a movable iron core capable of being separated from the valve element; and a fixed iron core arranged opposed to the movable iron core. The solenoid valve also includes: a first spring member that energizes the valve element toward a side of the valve seat; a second spring member that energizes the movable iron core toward the fixed iron core; and a stopper part disposed on the side of the valve seat with respect to the movable iron core, and arranged with the movable iron core via a gap in a displacement direction in a valve closed state. The gap is set so the movable iron core collides with the stopper part when being displaced in the valve closing direction after the valve element is opened.
    Type: Grant
    Filed: June 17, 2016
    Date of Patent: April 23, 2019
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Yoshihito Yasukawa, Akiyasu Miyamoto, Takao Miyake, Takatoshi Iizuka, Masashi Sugaya, Kiyotaka Ogura, Motoyuki Abe
  • Publication number: 20190078543
    Abstract: Electromagnetic solenoid has movable core having end surface that is formed between inner circumferential surface and outer circumferential surface of movable core; and fixed core having end surface that is formed between inner circumferential surface and outer circumferential surface of fixed core and faces the end surface of movable core. Ring-shaped protruding portion is formed at least either one of the end surface of the movable core or the end surface of the fixed core. Protruding portion is provided at a position that is shifted to a radially inner circumferential side of the end surface. A length between apex and inner circumferential edge of protruding portion is shorter than a length between the apex and an outer circumferential edge of protruding portion.
    Type: Application
    Filed: February 16, 2017
    Publication date: March 14, 2019
    Inventors: Akihiro YAMAZAKI, Takahiro SAITO, Nobuaki KOBAYASHI, Akiyasu MIYAMOTO, Yoshihito YASUKAWA
  • Patent number: 10197028
    Abstract: A fuel injector is provided. A movable iron core is provided relatively displaceable to a valve body. A fixed iron core is opposed to the movable iron core. A first spring member energizes the valve body in a valve closing direction. A second spring member energizes the movable iron core in a valve closing direction. Contact portions are in contact with each other in a case where the movable iron core displaces in a valve opening direction with respect to the valve body. A gap is formed between the contact portions in a valve closing state. In a state in which the movable iron core and the valve body move in different directions after the movable iron core collides with the fixed iron core while a valve is opened, a spring force is not applied between the movable iron core and the valve body.
    Type: Grant
    Filed: July 1, 2015
    Date of Patent: February 5, 2019
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD
    Inventors: Yoshihito Yasukawa, Takao Miyake, Atsushi Nakai, Masashi Sugaya, Akiyasu Miyamoto, Kiyotaka Ogura, Motoyuki Abe
  • Publication number: 20190024601
    Abstract: A control device of a fuel injection device improves stabilization in an opening operation of a valve element and stabilizes an injection amount. The control device includes a valve element to open a fuel passage by being separated from a valve seat, a movable iron core to perform an opening/closing operation of the valve element, and a fixed iron core to attract the movable iron core when a current flows to a coil. The control device includes a control unit which performs an intermediate energization in which the coil is energized again to attract the movable iron core to the fixed iron core and then the energizing to the coil is blocked and the movable iron core is displaced in a direction away from the fixed core. The control unit controls whether the intermediate energization is performed according to an injection interval of the fuel injection device.
    Type: Application
    Filed: December 22, 2016
    Publication date: January 24, 2019
    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Akiyasu MIYAMOTO, Masahiro TOYOHARA, Osamu MUKAIHARA, Yoshihito YASUKAWA
  • Publication number: 20190003436
    Abstract: An object of the present invention is to provide a fuel injection device in which variations in an injection flow rate for each injection is suppressed and an injection amount is stabilized. The fuel injection device according to the present invention includes: a valve element that is seated on or unseated from a valve seat; a plurality of guide parts (302a, 302b, 302c) that slidably guide the valve element; and flow paths (306a, 306b, 306c) sandwiched between the guide parts in a circumferential direction. In the fuel injection device, one guide part (302a) among the plurality of guide parts is formed to have a longer circumferential length than that of other guide parts (302b, 302c).
    Type: Application
    Filed: November 14, 2016
    Publication date: January 3, 2019
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Yoshihito YASUKAWA, Kiyotaka OGURA, Takao MIYAKE, Akira IIZUKA, Akiyasu MIYAMOTO, Kazuki YOSHIMURA