Patents by Inventor Noriyuki Maekawa
Noriyuki Maekawa 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).
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Publication number: 20220345060Abstract: Conventionally, there is a problem that switching loss of an inverter increases in a case where a change such as improvement in a switching frequency is involved. The battery voltage E and the torque command T* are input to the first current command generation unit 111. The battery voltage E, the torque command T*, and a voltage utilization rate obtained by dividing a line voltage effective value by a battery voltage (DC voltage) are input to a second current command generation unit 112. A magnet temperature Tmag of a rotor magnet is input to a current command selection unit 113, and a current command output from the first current command generation unit 111 is selected in normal operation, and the second current command generation unit 112 is selected in a case where the magnet temperature exceeds a predetermined value. The second current command generation unit 112 is configured not to obtain the voltage utilization rate of 0.3 to 0.4.Type: ApplicationFiled: August 14, 2020Publication date: October 27, 2022Applicant: HITACHI ASTEMO, LTD.Inventors: Takafumi HARA, Toshiyuki AJIMA, Katsuhiro HOSHINO, Noriyuki MAEKAWA
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Publication number: 20220337184Abstract: An object of the present invention is to provide a winding switching device capable of enhancing the reliability of electrical contact between a movable unit and a fixed unit, and a rotating electrical machine drive system including such a winding switching device.Type: ApplicationFiled: August 14, 2020Publication date: October 20, 2022Inventors: Kazuo NISHIHAMA, Akeshi TAKAHASHI, Katsuhiro HOSHINO, Noriyuki MAEKAWA
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Publication number: 20220338370Abstract: No consideration is given to heat transferred from a semiconductor module to a capacitor via a bus bar module. The heat generated by a semiconductor module (1) is transferred to a bus bar module (3) via a DC terminal (1A) of the semiconductor module (1). As illustrated in FIG. 4(B), the heat transferred to the bus bar module 3 is then transferred to the pressing member 5 via the annular conductor 8 and the bolt 5A. Since the pressing member 5 is in close contact with the second cooler 2B, the heat transferred to the pressing member 5 is cooled by the second cooler 2B. On the other hand, the heat transferred to the convex portion 6A of the housing 6 is transferred to the first cooler 2A via the housing 6 and cooled. As a result, in the configuration in which a capacitor (4) is connected to the semiconductor module (1) via the bus bar module (3), the heat transferred from the semiconductor module (1) to the capacitor (4) can be suppressed.Type: ApplicationFiled: July 31, 2020Publication date: October 20, 2022Applicant: HITACHI ASTEMO, LTD.Inventors: Takashi HIRAO, Takeshi TOKUYAMA, Noriyuki MAEKAWA, Akira MATSUSHITA, Toshiya SATOH
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Publication number: 20210381479Abstract: An object of the present invention is to provide a fuel injection valve capable of suppressing fuel adhesion to a nozzle surface. Therefore, an injection hole 107 has a curved surface portion 107E formed between a peripheral edge 107I of an inlet opening 107G and an inner peripheral surface 107F. The curved surface portion 107E has a center-side curved surface portion 107AE and an outer-peripheral-side curved surface portion 107BE. The center-side curved surface portion 107AE is formed to have a width W107AE that is larger than the width W107BE of the outer-peripheral-side curved surface portion 107BE.Type: ApplicationFiled: October 4, 2019Publication date: December 9, 2021Inventors: Takaki ITAYA, Noriyuki MAEKAWA
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Publication number: 20210310452Abstract: In a fuel injection device, a driving unit structure has a magnetic aperture, in which an inner diameter is gradually enlarged toward the mover side, provided in an inner peripheral surface of the magnetic core. It is possible to reduce magnetic delay time upon valve opening from the supply of the electric current to the coil to the rise of magnetic flux and magnetic delay time upon valve closing from the stoppage of the electric current to the coil to reduction of magnetic flux, by providing a magnetic aperture in the inner peripheral surface of the magnetic core. Thus it is possible to improve the dynamic responsiveness upon valve opening and valve closing.Type: ApplicationFiled: June 21, 2021Publication date: October 7, 2021Inventors: Ryo KUSAKABE, Motoyuki ABE, Tohru ISHIKAWA, Noriyuki MAEKAWA, Masahiro SOMA, Takao MIYAKE, Yasuo NAMAIZAWA
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Patent number: 11136954Abstract: A fuel injection valve is a fuel injection valve for injecting fuel to a combustion chamber of an internal combustion engine, which includes a valve body that is lifted by any one of a first lift amount of a maximum valve body lift amount and a second lift amount smaller than the first lift amount. In a case where the maximum valve body lift amount of the valve body is the first lift amount, a flow path area of a seat portion is larger than a sum of flow path areas of all injection holes, and in a case where the maximum valve body lift amount of the valve body is the second lift amount, the flow path area of the seat portion is smaller than the sum of flow path areas of all the injection holes.Type: GrantFiled: November 13, 2018Date of Patent: October 5, 2021Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Tomoyuki Hosaka, Eiji Ishii, Kazuki Yoshimura, Noriyuki Maekawa
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Patent number: 11131400Abstract: Provided is a high-pressure fuel supply pump and a method of manufacturing thereof which can suppress the progress of corrosion and cavitation erosion even when the pressure becomes higher, or when biofuel or a fuel having a high oil content of biofuel is used. Therefore, the high-pressure fuel supply pump includes a discharge valve 51b that discharges fuel, and a discharge valve seat 51a on which the discharge valve 51b is seated. The base material of the discharge valve 51b and the discharge valve seat 51a is a steel material. On the surface of the discharge valve 51b, a Co-based alloy layer 70b and a Cr-enriched portion 70b1 having a higher Cr concentration than the surrounding Co-based alloy layer 70b are formed. The Co-based alloy layer 70a is formed on the surface of the discharge valve seat 51a.Type: GrantFiled: December 7, 2018Date of Patent: September 28, 2021Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Mina Amo, Kenya Ohashi, Arata Kagiyama, Koichi Yamaka, Noriyuki Maekawa
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Patent number: 11098670Abstract: Provided is a control device of a fuel injection device which can stabilize a behavior of a valve even when a voltage of a voltage source varies, and can reduce a deviation of an injection amount. A control device 150 of a fuel injection device 101 includes a valve 214, a coil 205 which generates a magnetic attraction force to attract a movable member 202 which drives the valve 214, and a voltage source. The fuel injection device 101 applies a voltage to the coil 205 on the basis of an injection pulse, causes a drive current to flow to the coil 205 until the current becomes a maximum current to attract the movable member 202, and drives the valve 214 to inject fuel. The drive current flowing to the coil 205 or a voltage of the voltage source is detected before the injection pulse is stopped. In a case where the detected drive current or the voltage is equal to or less than a setting, a width of the injection pulse or an injection pulse different from the injection pulse is corrected to be long.Type: GrantFiled: December 20, 2017Date of Patent: August 24, 2021Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Ryo Kusakabe, Masayuki Saruwatari, Noriyuki Maekawa
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Patent number: 11098686Abstract: An object of the present invention is to provide a fuel injection valve that can be used in a gasoline engine and can take fuel into an injection hole with a small pressure loss near a seat portion on which a valve is seated. Thus, the present invention provides a fuel injection valve for a gasoline engine which includes: a plurality of injection holes; and a seat portion that opens and closes a fuel passage to the plurality of injection holes in cooperation with a valve. At least one fuel injection hole among the plurality of injection holes is configured in a shape such that an injection hole inlet has a long axis and a short axis, and the long axis is directed in a direction in which an extension line intersects with the seat portion.Type: GrantFiled: April 19, 2018Date of Patent: August 24, 2021Assignee: Hitachi Automotive Systems, Ltd.Inventors: Takaki Itaya, Tomoyuki Hosaka, Noriyuki Maekawa, Takao Miyake
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Patent number: 11067045Abstract: In a fuel injection device, a driving unit structure has a magnetic aperture, in which an inner diameter is gradually enlarged toward the mover side, provided in an inner peripheral surface of the magnetic core. It is possible to reduce magnetic delay time upon valve opening from the supply of the electric current to the coil to the rise of magnetic flux and magnetic delay time upon valve closing from the stoppage of the electric current to the coil to reduction of magnetic flux, by providing a magnetic aperture in the inner peripheral surface of the magnetic core. Thus it is possible to improve the dynamic responsiveness upon valve opening and valve closing.Type: GrantFiled: March 9, 2012Date of Patent: July 20, 2021Assignee: Hitachi Automotive Systems, Ltd.Inventors: Ryo Kusakabe, Motoyuki Abe, Tohru Ishikawa, Noriyuki Maekawa, Masahiro Soma, Takao Miyake, Yasuo Namaizawa
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Publication number: 20210190025Abstract: The conventional penetration control has a problem that the penetrations of all the injection holes change. An object of the invention is to provide a fuel injection valve having a simple structure and capable of selectively controlling a penetration force of spray injected in a piston direction by a lift amount. In order to solve the above problem, the fuel injection valve of the invention is a fuel injection valve for injecting fuel to a combustion chamber of an internal combustion engine, which includes a valve body that is lifted by any one of a first lift amount of a maximum valve body lift amount and a second lift amount smaller than the first lift amount.Type: ApplicationFiled: November 13, 2018Publication date: June 24, 2021Applicant: Hitachi Automotive Systems, Ltd.Inventors: Tomoyuki HOSAKA, Eiji ISHII, Kazuki YOSHIMURA, Noriyuki MAEKAWA
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Patent number: 10859047Abstract: 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: GrantFiled: August 23, 2018Date of Patent: December 8, 2020Assignee: Hitachi Automotive Systems, Ltd.Inventors: Ryo Kusakabe, Motoyuki Abe, Yoshihito Yasukawa, Noriyuki Maekawa, Takuya Mayuzumi, Tohru Ishikawa
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Patent number: 10837118Abstract: Provided is a surface treated steel sheet for a fuel tank, the surface treated steel sheet including: a Zn plated layer or a Zn—Ni alloy plated layer which is formed on at least a surface of the steel sheet to be an inner surface of the fuel tank; and a chromate-free chemical conversion coating layer containing a water-and-oil repellent, the chromate-free chemical conversion coating layer being placed over the Zn plated layer or the Zn—Ni alloy plated layer on the surface to be the inner surface of the fuel tank. A water contact angle on a surface of the chromate-free chemical conversion coating layer is more than or equal to 70 degrees and an n-hexadecane contact angle on the surface of the chromate-free chemical conversion coating layer is more than or equal to 30 degrees and less than or equal to 70 degrees.Type: GrantFiled: January 20, 2016Date of Patent: November 17, 2020Assignee: NIPPON STEEL CORPORATIONInventors: Kiyokazu Ishizuka, Noriyuki Maekawa, Hiroaki Uramoto, Hidetoshi Shindo, Ikuo Kikuchi, Kenichiro Matsumura
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Publication number: 20200284368Abstract: Provided is a high-pressure fuel supply pump and a method of manufacturing thereof which can suppress the progress of corrosion and cavitation erosion even when the pressure becomes higher, or when biofuel or a fuel having a high oil content of biofuel is used. Therefore, the high-pressure fuel supply pump includes a discharge valve 51b that discharges fuel, and a discharge valve seat 51a on which the discharge valve 51b is seated. The base material of the discharge valve 51b and the discharge valve seat 51a is a steel material. On the surface of the discharge valve 51b, a Co-based alloy layer 70b and a Cr-enriched portion 70b1 having a higher Cr concentration than the surrounding Co-based alloy layer 70b are formed. The Co-based alloy layer 70a is formed on the surface of the discharge valve seat 51a.Type: ApplicationFiled: December 7, 2018Publication date: September 10, 2020Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Mina AMO, Kenya OHASHI, Arata KAGIYAMA, Koichi YAMAKA, Noriyuki MAEKAWA
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Patent number: 10731594Abstract: Provided is a control device of a fuel injection device which can stabilize a behavior of a valve even when a voltage of a voltage source varies, and can reduce a deviation of an injection amount. The fuel injection device includes a valve and a coil which generates a magnetic attraction force to attract a movable element which drives the valve. A control device applies a predetermined voltage to the coil on the basis of an injection pulse, causes a drive current to flow to the coil until the drive current reaches a maximum current, drives the valve by attracting the movable element, and injects fuel. The drive current flowing to the coil is lowered from the maximum current before the valve reaches a desired maximum lift position, and a constant voltage lower than a predetermined voltage or 0 V is continuously applied to the coil until the valve reaches the desired maximum lift position.Type: GrantFiled: November 1, 2017Date of Patent: August 4, 2020Assignee: Hitachi Automotive Systems, Ltd.Inventors: Ryo Kusakabe, Masayuki Saruwatari, Noriyuki Maekawa
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Publication number: 20200240380Abstract: Dispersibility of fuel in a combustion chamber is improved while adhesion of the fuel to a structure in the combustion chamber is suppressed, and a combustion state of the fuel in the combustion chamber is improved, thereby improving fuel efficiency and suppressing incomplete combustion. Therefore, in a fuel injection valve provided with the plurality of fuel injection holes surrounded by a seat portion, the fuel injection holes have different penetrations. At least one high-pressure fuel injection hole having the longest penetration and low-pressure fuel injection holes excluding the fuel injection hole are included. Among the inter-inlet distances of the adjacent fuel injection holes, an inter-inlet distance between the fuel injection hole and the fuel injection holes adjacent thereto is widest.Type: ApplicationFiled: November 15, 2018Publication date: July 30, 2020Inventors: Takaki ITAYA, Noriyuki MAEKAWA, Takao MIYAKE
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Patent number: 10697067Abstract: A steel sheet for a fuel tank according to the present invention includes: a Zn—Ni alloy plated layer placed on one surface or each of both surfaces of a base metal; and a chromate-free chemical conversion coating film which is placed over the Zn—Ni alloy plated layer. The Zn—Ni alloy plated layer has a crack starting from an interface with the chromate-free chemical conversion coating film and reaching an interface with the steel sheet, the chromate-free chemical conversion coating film consists of an organosilicon compound consisting of a condensation polymer of a silane coupling agent, a phosphoric acid compound and/or a phosphonic acid compound, a vanadium compound, and a titanium compound and/or a zirconium compound, and a concentration of a total of amounts in terms of metal, per surface, of the phosphoric acid compound and/or the phosphonic acid compound+the vanadium compound+the titanium compound and/or the zirconium compound, is 5 mass % to 20 mass %.Type: GrantFiled: February 1, 2016Date of Patent: June 30, 2020Assignee: NIPPON STEEL CORPORATIONInventors: Kiyokazu Ishizuka, Noriyuki Maekawa, Hiroaki Uramoto, Masahiro Fuda, Ikuro Yamaoka, Kenichiro Matsumura
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Patent number: 10688755Abstract: A steel sheet for a fuel tank includes: a Zn—Ni alloy plated layer which is placed on one surface or each of both surfaces of a base metal and formed on at least one surface; and an inorganic chromate-free chemical conversion coating film which is placed over the Zn—Ni alloy plated layer. The Zn—Ni alloy plated layer has a crack starting from an interface between the Zn—Ni alloy plated layer and the inorganic chromate-free chemical conversion coating film and reaching an interface between the Zn—Ni alloy plated layer and the steel sheet, and a water contact angle on a surface of the inorganic chromate-free chemical conversion coating film is more than or equal to 50 degrees.Type: GrantFiled: December 1, 2016Date of Patent: June 23, 2020Assignee: NIPPON STEEL CORPORATIONInventors: Kiyokazu Ishizuka, Noriyuki Maekawa, Hiroaki Uramoto, Masahiro Fuda, Ikuro Yamaoka, Kenichiro Matsumura
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Patent number: 10634105Abstract: One passage for swirling is formed in an orifice plate fixed on a nozzle body. Two swirl chambers in which fuel is caused to swirl so that the fuel has swirling force are provided at an end of the one passage for swirling on the downstream side of the flow direction of fuel. Therefore, the collision between the swirling flow in the swirl chamber and the fuel flowing in the passage for swirling is mitigated, and the swirling flow can be smoothly produced to promote pulverization of sprays injected from fuel injection ports.Type: GrantFiled: June 22, 2016Date of Patent: April 28, 2020Assignee: Hitachi Automotive Systems, Ltd.Inventors: Yoshio Okamoto, Yoshihito Yasukawa, Noriyuki Maekawa, Nobuaki Kobayashi, Takahiro Saito
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Publication number: 20200088122Abstract: Provided is a control device of a fuel injection device which can stabilize a behavior of a valve even when a voltage of a voltage source varies, and can reduce a deviation of an injection amount. A control device 150 of a fuel injection device 101 includes a valve 214, a coil 205 which generates a magnetic attraction force to attract a movable member 202 which drives the valve 214, and a voltage source. The fuel injection device 101 applies a voltage to the coil 205 on the basis of an injection pulse, causes a drive current to flow to the coil 205 until the current becomes a maximum current to attract the movable member 202, and drives the valve 214 to inject fuel. The drive current flowing to the coil 205 or a voltage of the voltage source is detected before the injection pulse is stopped. In a case where the detected drive current or the voltage is equal to or less than a setting, a width of the injection pulse or an injection pulse different from the injection pulse is corrected to be long.Type: ApplicationFiled: December 20, 2017Publication date: March 19, 2020Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Ryo KUSAKABE, Masayuki SARUWATARI, Noriyuki MAEKAWA