Patents by Inventor Hideharu Ehara

Hideharu Ehara 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: 10711721
    Abstract: Because the relationship of the fuel injection quantity to a designated injection period differs in a half-lift region and a full-lift region, the purpose of the present invention is to bring the flow rate characteristics of an intermediate-lift region close to the flow rate characteristics of the full-lift region and improve the controllability of small fuel injection quantities. Provided are a peak current supply period in which a valve body of a fuel injection valve causes the magnetic force necessary for a valve-opening action to be generated, and a lift quantity adjustment period in which, after the peak current supply period, a current lower than the peak current is passed for a prescribed period; further provided is a current interrupt period in which a drive current is rapidly lowered before the lift quantity adjustment period.
    Type: Grant
    Filed: March 25, 2015
    Date of Patent: July 14, 2020
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Osamu Mukaihara, Masahiro Toyohara, Hideharu Ehara
  • 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: 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: 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: 10240567
    Abstract: A fuel injection valve includes a valve body, a coil, an inner fixed iron core that is arranged on an inner peripheral side of the coil, and an outer fixed iron core that is arranged on an outer peripheral side of the coil. The fuel injection valve also includes a movable element that is configured to be attracted to the inner fixed iron core and the outer fixed iron core, wherein the movable element is configured to be separable from the valve body and is configured to move the valve body.
    Type: Grant
    Filed: July 3, 2017
    Date of Patent: March 26, 2019
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Yoshihito Yasukawa, Hideharu Ehara, Tohru Ishikawa, Motoyuki Abe, Ryo Kusakabe
  • Publication number: 20190063387
    Abstract: A fuel injection valve includes a valve body, a coil, an inner fixed iron core that is arranged on an inner peripheral side of the coil, and an outer fixed iron core that is arranged on an outer peripheral side of the coil. The fuel injection valve also includes a movable element that is configured to be attracted to the inner fixed iron core and the outer fixed iron core, wherein the movable element is configured to be separable from the valve body and is configured to move the valve body.
    Type: Application
    Filed: October 24, 2018
    Publication date: February 28, 2019
    Inventors: Yoshihito YASUKAWA, Hideharu EHARA, Tohru ISHIKAWA, Motoyuki ABE, Ryo KUSAKABE
  • Publication number: 20170298882
    Abstract: A fuel injection valve includes a valve body, a coil, an inner fixed iron core that is arranged on an inner peripheral side of the coil, and an outer fixed iron core that is arranged on an outer peripheral side of the coil. The fuel injection valve also includes a movable element that is configured to be attracted to the inner fixed iron core and the outer fixed iron core, wherein the movable element is configured to be separable from the valve body and is configured to move the valve body.
    Type: Application
    Filed: July 3, 2017
    Publication date: October 19, 2017
    Inventors: Yoshihito YASUKAWA, Hideharu EHARA, Tohru ISHIKAWA, Motoyuki ABE, Ryo KUSAKABE
  • Patent number: 9765740
    Abstract: A fuel injection valve is provided that can reduce variations in stroke length by reducing distortion during welding, and consequently can reduce variations in flow rate of injected fuel. The fuel injection valve has a nozzle; a fixed valve that is press-fit into a tip of the nozzle and has a fuel injection port from which the fuel is injected; and a movable element that forms a fuel seal section by abutting against the fixed valve, and opens and closes the fuel injection port. The fixed valve and the nozzle are fixed in place by welding at a position with no space due to press-fitting. A groove that serves as an empty space is provided in a continuation of a welded section that is formed in the fixed valve and the nozzle by the welding.
    Type: Grant
    Filed: January 16, 2013
    Date of Patent: September 19, 2017
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Atsushi Takaoku, Yasuo Namaizawa, Hideharu Ehara, Masahiro Soma
  • Patent number: 9726127
    Abstract: A fuel injection valve includes a valve body, a coil, an inner fixed iron core that is arranged on an inner peripheral side of the coil, and an outer fixed iron core that is arranged on an outer peripheral side of the coil. The fuel injection valve also includes a movable element that is configured to be attracted to the inner fixed iron core and the outer fixed iron core, wherein the movable element is configured to be separable from the valve body and is configured to move the valve body.
    Type: Grant
    Filed: November 30, 2016
    Date of Patent: August 8, 2017
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Yoshihito Yasukawa, Hideharu Ehara, Tohru Ishikawa, Motoyuki Abe, Ryo Kusakabe
  • Patent number: 9714626
    Abstract: An object of this disclosure is to provide a fuel injection device that can reliably detect an operation timing of a valve body, that is, a valve opening timing with high accuracy. The current of an electromagnetic valve reaches I2 at time t3, an FET 201 and an FET 221 are turned on, and a battery voltage VB is applied to the electromagnetic valve until time t5 is reached. The amount of displacement of the valve body reaches a target amount of control lift at time t4 between time t3 and time t5, that is, a movable core 304 comes into contact with a fixed core 301. The detection of the valve opening timing is performed during the period from time t3 to time t5.
    Type: Grant
    Filed: January 24, 2014
    Date of Patent: July 25, 2017
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Ayumu Hatanaka, Ryo Kusakabe, Motoyuki Abe, Toshihiro Aono, Teppei Hirotsu, Hideyuki Sakamoto, Takao Fukuda, Hideharu Ehara, Masahiro Toyohara, Akira Nishioka, Toshio Hori, Kiyoshi Aiki
  • 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: 9617963
    Abstract: In a fuel injection valve, it is possible to obtain spray in which the penetrating force of injected fuel is suppressed. The fuel injection valve includes a valve seat that forms a gap with a valve body, the gap allowing fuel to pass therethrough, and multiple injection holes that are located further downstream from the gap. The fuel to which pressure is applied flows out from the injection holes. When the flow velocity of the fuel in the gap formed between the valve body and the valve seat is indicated by meters per second, the flow velocity is set to be greater than a value obtained by multiplying the square root of the pressure applied to the fuel by 28. In this manner, the flow velocity in the gap increases, and flow velocity distribution inside the injection hole is uniformized, thereby suppressing an increase in penetration.
    Type: Grant
    Filed: January 24, 2014
    Date of Patent: April 11, 2017
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Motoyuki Abe, Kiyotaka Ogura, Eiji Ishii, Tohru Ishikawa, Masahiro Soma, Hideharu Ehara
  • Publication number: 20170082078
    Abstract: A fuel injection valve includes a valve body, a coil, an inner fixed iron core that is arranged on an inner peripheral side of the coil, and an outer fixed iron core that is arranged on an outer peripheral side of the coil. The fuel injection valve also includes a movable element that is configured to be attracted to the inner fixed iron core and the outer fixed iron core, wherein the movable element is configured to be separable from the valve body and is configured to move the valve body.
    Type: Application
    Filed: November 30, 2016
    Publication date: March 23, 2017
    Inventors: Yoshihito YASUKAWA, Hideharu EHARA, Tohru ISHIKAWA, Motoyuki ABE, Ryo KUSAKABE
  • Patent number: 9599083
    Abstract: In a fuel injection valve used in an internal combustion engine, fuel spray travel distance is shortened.
    Type: Grant
    Filed: January 24, 2014
    Date of Patent: March 21, 2017
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Eiji Ishii, Motoyuki Abe, Yoshihito Yasukawa, Kiyotaka Ogura, Hideharu Ehara, Tohru Ishikawa
  • 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: 20170067430
    Abstract: An electromagnetic fuel injection valve includes a valve element, a movable element, a magnetic core, and a coil. The movable element includes an inner movable element that faces a radially inner part of the magnetic attractive surface of the magnetic core in a moving direction of the valve element. The inner movable element is biased in a valve closing direction by a first spring. The movable element also includes an outer movable element that faces a radially outer part of the magnetic attractive surface of the magnetic core in the moving direction of the valve element. The outer movable element biased in a valve opening direction by a second spring.
    Type: Application
    Filed: November 18, 2016
    Publication date: March 9, 2017
    Inventors: Motoyuki ABE, Ryo KUSAKABE, Hideharu EHARA, Yoshihito YASUKAWA
  • Publication number: 20170051696
    Abstract: Because the relationship of the fuel injection quantity to a designated injection period differs in a half-lift region and a full-lift region, the purpose of the present invention is to bring the flow rate characteristics of an intermediate-lift region close to the flow rate characteristics of the full-lift region and improve the controllability of small fuel injection quantities. Provided are a peak current supply period in which a valve body of a fuel injection valve causes the magnetic force necessary for a valve-opening action to be generated, and a lift quantity adjustment period in which, after the peak current supply period, a current lower than the peak current is passed for a prescribed period; further provided is a current interrupt period in which a drive current is rapidly lowered before the lift quantity adjustment period.
    Type: Application
    Filed: March 25, 2015
    Publication date: February 23, 2017
    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Osamu MUKAIHARA, Masahiro TOYOHARA, Hideharu EHARA
  • Patent number: 9541046
    Abstract: A fuel injection valve having a variable stroke mechanism is constructed. A valve body provided to be slidable; a first movable element for cooperating with the valve body; an inner fixed iron core provided at a position to oppose a second movable element; an outer fixed iron core; and a coil are included. A lift amount of the second movable element is set larger than a lift amount of the first movable element, and a portion of the second movable element is projected into the first movable element. In this way, large and small lifts are constituted by using a difference between magnetic attractive forces that are generated in the first movable element and the second movable element by a current supplied to the coil.
    Type: Grant
    Filed: January 10, 2014
    Date of Patent: January 10, 2017
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Yoshihito Yasukawa, Hideharu Ehara, Tohru Ishikawa, Motoyuki Abe, Ryo Kusakabe
  • Patent number: 9534573
    Abstract: An object of the invention is to provide a fuel injection valve that applies a swirl to an upstream side of a seat section to shorten spray penetration. When flows into injection hole entries are indicated by arrows 101a to 106a and injection hole exit directions are indicated by arrows 201 to 206, an angle ? defined by the inflow direction 101a and the exit direction 201 of an injection hole 71 can be increased. In a method for applying the twisted angle ?, a side groove 15a on an outer peripheral side of a guide member 12a is set to be accompanied with a twist with respect to an axis O1. Furthermore, a flow passage area of the side groove 15a is set smaller than a flow passage area on an upstream side of the guide member 12a and is also set larger than a flow passage area of a seat section 7B that is constructed by a gap between a valve body 7 and an orifice cup 7.
    Type: Grant
    Filed: January 24, 2014
    Date of Patent: January 3, 2017
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Kiyotaka Ogura, Hideharu Ehara, Motoyuki Abe, Eiji Ishii, Masanori Mifuji, Atsushi Takaoku, Takao Miyake
  • Patent number: 9528482
    Abstract: Provided is an electromagnetic fuel injection valve in which in both operations of opening and closing a valve, a movable element is made to free run before a valve element starts to operate, and bounding motion of the movable element occurring at the time of the valve opening operation is reduced, thereby balancing improvement of responsiveness and improvement of stability of operation. There are equipped with: a first movable element 105, which is biased by a first spring 106 biasing in a valve closing direction, as a movable element which opens and closes a valve when being attracted by a magnetic core 109 of the electromagnetic fuel injection valve; and a second movable element 104 biased toward the magnetic core 109 by a second spring 112 biasing in a valve opening direction.
    Type: Grant
    Filed: June 19, 2013
    Date of Patent: December 27, 2016
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Motoyuki Abe, Ryo Kusakabe, Hideharu Ehara, Yoshihito Yasukawa