Patents by Inventor Hidefumi Iwaki
Hidefumi Iwaki 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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Patent number: 11378052Abstract: Energization abnormality of a switch element of an internal combustion engine ignition device is detected appropriately. To this end, in an internal combustion engine ignition device that includes an ignition coil and an ignition plug, the ignition coil includes a primary coil including a main primary coil and a sub primary coil and a secondary coil that generates secondary current in response to a voltage variation generated in the primary coil.Type: GrantFiled: November 20, 2018Date of Patent: July 5, 2022Assignee: Hitachi Astemo, Ltd.Inventor: Hidefumi Iwaki
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Patent number: 11371480Abstract: Due to changes in a flow of an air-fuel mixture in a cylinder, reliable ignition due to spark discharge may not be possible. Therefore, an ignition control unit 24 includes a secondary voltage calculation unit 31 that calculates an average value of a secondary voltage generated on a secondary side of an ignition coil, an irregular flow ratio calculation unit 32 that calculates a ratio of cycles in which the average value of the secondary voltage is equal to or less than a set average value with respect to a cycle of the internal combustion engine in a predetermined period as an irregular flow ratio indicating that the flow of the air-fuel mixture in the cylinder is irregular, and an ignition operation amount correction unit 37 that corrects an ignition operation amount so that the irregular flow ratio is equal to or less than the set ratio value that is the target to be reached of the irregular flow ratio.Type: GrantFiled: December 23, 2019Date of Patent: June 28, 2022Assignee: Hitachi Astemo, Ltd.Inventors: Kazuhiro Oryoji, Yoshihiko Akagi, Hidefumi Iwaki
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Publication number: 20220010762Abstract: Due to changes in a flow of an air-fuel mixture in a cylinder, reliable ignition due to spark discharge may not be possible. Therefore, an ignition control unit 24 includes a secondary voltage calculation unit 31 that calculates an average value of a secondary voltage generated on a secondary side of an ignition coil, an irregular flow ratio calculation unit 32 that calculates a ratio of cycles in which the average value of the secondary voltage is equal to or less than a set average value with respect to a cycle of the internal combustion engine in a predetermined period as an irregular flow ratio indicating that the flow of the air-fuel mixture in the cylinder is irregular, and an ignition operation amount correction unit 37 that corrects an ignition operation amount so that the irregular flow ratio is equal to or less than the set ratio value that is the target to be reached of the irregular flow ratio.Type: ApplicationFiled: December 23, 2019Publication date: January 13, 2022Inventors: Kazuhiro ORYOJI, Yoshihiko AKAGI, Hidefumi IWAKI
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Publication number: 20200318598Abstract: Please substitute the new Abstract submitted herewith for the original Abstract: Energization abnormality of a switch element of an internal combustion engine ignition device is detected appropriately. To this end, in an internal combustion engine ignition device that includes an ignition coil and an ignition plug, the ignition coil includes a primary coil including a main primary coil and a sub primary coil and a secondary coil that generates secondary current in response to a voltage variation generated in the primary coil.Type: ApplicationFiled: November 20, 2018Publication date: October 8, 2020Inventor: Hidefumi IWAKI
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Patent number: 10170954Abstract: The purpose of the present invention is to provide a direct current motor wherein the number of coil-connecting wires that cross the outer surface of a coil end part is reduced. In a direct current motor that is provided with an armature that has a plurality of armature slots and has an armature coil that is wound so as to span two armature slots that are separated by a fixed number of armature slots, a lowermost layer of a coil end part is provided with at least four armature coils that are wound through other armature slots so as not to coincide with the wound armature coil, and a layer above the four armature coils that are wound on the bottommost layer is provided with at least four armature coils that are wound in the same manner as the four armature coils.Type: GrantFiled: January 14, 2015Date of Patent: January 1, 2019Assignee: Hitachi Automotive Systems, Ltd.Inventors: Tsukasa Taniguchi, Hidefumi Iwaki, Koichi Kashiwa, Masahiro Hosoya
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Patent number: 9583985Abstract: A DC commutator motor includes a yoke, a field magnet, and an armature. A shaft is positioned on a central axis of the armature. A plurality of commutator segments is positioned in a circumferential direction of the shaft. A plurality of armature slots is formed on an outer periphery of an armature core. An upper coil is wound the number of turns Na through two armature slots, which are located apart from each other with the predetermined number of armature slots therebetween, at their opening sides. A lower coil is connected in parallel with the upper coil and wound the number of turns Nb through the two armature slots at their bottom sides. The number of turns Na is smaller than the number of turns Nb.Type: GrantFiled: April 5, 2013Date of Patent: February 28, 2017Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Tsukasa Taniguchi, Hidefumi Iwaki
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Publication number: 20160352171Abstract: The purpose of the present invention is to provide a direct current motor wherein the number of coil-connecting wires that cross the outer surface of a coil end part is reduced. In a direct current motor that is provided with an armature that has a plurality of armature slots and has an armature coil that is wound so as to span two armature slots that are separated by a fixed number of armature slots, a lowermost layer of a coil end part is provided with at least four armature coils that are wound through other armature slots so as not to coincide with the wound armature coil, and a layer above the four armature coils that are wound on the bottommost layer is provided with at least four armature coils that are wound in the same manner as the four armature coils.Type: ApplicationFiled: January 14, 2015Publication date: December 1, 2016Inventors: Tsukasa TANIGUCHI, Hidefumi IWAKI, Koichi KASHIWA, Masahiro HOSOYA
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Patent number: 9180852Abstract: An electric booster includes a housing having one end including a coupling surface where the housing is coupled to a master cylinder, and the other end including an attachment surface where the housing is attached to a vehicle. A controller includes a flat plate-like control board, and the control board is disposed so as to be positioned between a first plane including the attachment surface of the housing where the housing is attached to the vehicle, and a second plane including the coupling surface of the housing where the housing is coupled to the master cylinder.Type: GrantFiled: January 28, 2013Date of Patent: November 10, 2015Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Daichi Nomura, Takuya Usui, Toshiyuki Ajima, Hidefumi Iwaki, Kazuhiko Nakano, Hirohumi Watanabe
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Publication number: 20140084746Abstract: DC commutator motor that prevents variation in characteristics of the motor and suppressing deterioration of performance, and reduces the number of assembly steps. A magnet is attached to an inner circumferential surface of a bottomed cylindrical bracket to form a field pole. In an armature, a commutator is fastened to an armature core which is formed by laminating a plurality of thin core sheets. Shaft is inserted into the integrated body of the armature core with the commutator. Armature coil is wound within slots provided in the armature core, and bearings are attached. The armature is assembled with the field pole. Polygonal protruding portion which is made of resin is provided in the commutator, the protruding portion fastened to inner circumferential surfaces of the slots of the armature core, and the shaft is then inserted.Type: ApplicationFiled: August 7, 2013Publication date: March 27, 2014Applicant: Hitachi Automotive Systems, Ltd.Inventors: Tsukasa TANIGUCHI, Hidefumi IWAKI, Kenji KUNIYA, Daisuke NOZAKI, Toshikazu SAGAWA
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Publication number: 20140084734Abstract: The present invention, in a rotating electrical machine having a configuration in which a plurality of magnetic pole pieces is attached along outer perimeters of the rotating axis, provides a structure of rotating electrical machine with small cogging torque by providing a skew in magnetic pole pieces. The rotating electrical machine according to the present invention comprises a plurality of magnetic pole pieces disposed with a skew angle and a cylindrical attachment ring for attaching the magnetic pole pieces, wherein an engaging portion provided at outer perimeters of the attachment ring and an engaging portion included in the magnetic pole pieces are both extended along the rotating axis.Type: ApplicationFiled: July 31, 2013Publication date: March 27, 2014Applicant: Hitachi Automotive Systems, Ltd.Inventors: Takashi ISHIGAMI, Hiroshi KANAZAWA, Hidefumi IWAKI
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Publication number: 20140062254Abstract: A permanent magnet rotating electrical machine is configured to include a stator that includes a stator core and a winding wound around a teeth portion of the stator core, a rotor rotatably arranged with respect to the stator with a gap, and in which a rotor core and a plurality of permanent magnets having different poles are alternately arranged in a circumferential direction, and a groove provided in a surface of the rotor core, the surface facing the stator, in a manner symmetric about a center line of the permanent magnet in the circumferential direction.Type: ApplicationFiled: July 12, 2013Publication date: March 6, 2014Inventors: Junnosuke NAKATSUGAWA, Hiroshi KANAZAWA, Hidefumi IWAKI
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Publication number: 20130264904Abstract: A DC commutator motor includes a yoke, a field magnet, and an armature. A shaft is positioned on a central axis of the armature. A plurality of commutator segments is positioned in a circumferential direction of the shaft. A plurality of armature slots is formed on an outer periphery of an armature core. An upper coil is wound the number of turns Na through two armature slots, which are located apart from each other with the predetermined number of armature slots therebetween, at their opening sides. A lower coil is connected in parallel with the upper coil and wound the number of turns Nb through the two armature slots at their bottom sides. The number of turns Na is smaller than the number of turns Nb.Type: ApplicationFiled: April 5, 2013Publication date: October 10, 2013Applicant: Hitachi Automotive Systems, Ltd.Inventors: Tsukasa TANIGUCHI, Hidefumi IWAKI
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Patent number: 8181628Abstract: A throttle valve controller for an internal combustion engine has a throttle valve driven by a motor. The target opening of the throttle valve is determined based on the operating state of the vehicle or internal combustion engine. A first lower limit is determined beforehand as the minimum target opening, and a second lower limit is set which is smaller than the first lower limit if the determined target opening is smaller than a predetermined opening and/or if the rotation speed of the internal combustion engine is lower than a predetermined speed.Type: GrantFiled: August 31, 2011Date of Patent: May 22, 2012Assignee: Hitachi, Ltd.Inventors: Yoshihiko Akagi, Hidefumi Iwaki, Kenji Ono
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Publication number: 20110308496Abstract: A throttle valve controller for an internal combustion engine has a throttle valve driven by a motor. The target opening of the throttle valve is determined based on the operating state of the vehicle or internal combustion engine. A first lower limit is determined beforehand as the minimum target opening, and a second lower limit is set which is smaller than the first lower limit if the determined target opening is smaller than a predetermined opening and/or if the rotation speed of the internal combustion engine is lower than a predetermined speed.Type: ApplicationFiled: August 31, 2011Publication date: December 22, 2011Applicant: Hitachi, Ltd.Inventors: Yoshihiko AKAGI, Hidefumi Iwaki, Kenji Ono
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Patent number: 8033266Abstract: A throttle valve controller for an internal combustion engine has a throttle valve driven by a motor. The target opening of the throttle valve is determined based on the operating state of the vehicle or internal combustion engine. A first lower limit is determined beforehand as the minimum target opening, and a second lower limit is set which is smaller than the first lower limit if the determined target opening is smaller than a predetermined opening and/or if the rotation speed of the internal combustion engine is lower than a predetermined speed.Type: GrantFiled: November 27, 2007Date of Patent: October 11, 2011Assignee: Hitachi, Ltd.Inventors: Yoshihiko Akagi, Hidefumi Iwaki, Kenji Ono
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Patent number: 7866298Abstract: An object of the present invention is to provide a butterfly valve device made of resin, the butterfly valve device being little susceptible the secular change in gas flow (in particular, the minimum flow) or random changes. According to the present invention, when a butterfly valve is located at a full-closed position facing a peripheral lower surface of a semicircular portion with respect to a rotating shaft of the butterfly valve made of a resin material, a partial annular projection is adapted to radially inwardly extend towards an inner wall surface of a fluid path, the partial annular projection including a plane that contacts the peripheral lower surface of the valve to form a fluid seal.Type: GrantFiled: January 15, 2008Date of Patent: January 11, 2011Assignee: Hitachi, Ltd.Inventors: Takahiro Shimura, Masashi Banse, Hidefumi Iwaki
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Publication number: 20080168965Abstract: An object of the present invention is to provide a butterfly valve device made of resin, the butterfly valve device being little susceptible the secular change in gas flow (in particular, the minimum flow) or random changes. According to the present invention, when a butterfly valve is located at a full-closed position facing a peripheral lower surface of a semicircular portion with respect to a rotating shaft of the butterfly valve made of a resin material, a partial annular projection is adapted to radially inwardly extend towards an inner wall surface of a fluid path, the partial annular projection including a plane that contacts the peripheral lower surface of the valve to form a fluid seal.Type: ApplicationFiled: January 15, 2008Publication date: July 17, 2008Applicant: HITACHI, LTD.Inventors: Takahiro SHIMURA, Masashi Banse, Hidefumi Iwaki
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Publication number: 20080141976Abstract: If a throttle valve is moved toward the mechanical full close position at high speed, the throttle valve may overshoot and collide against the full close position. This may damage and deform the throttle valve. It is an object of the present invention to set a lower limiter to the throttle valve so as to secure a margin to prevent such collision while attaining lowered fuel consumption or improved fuel efficiency.Type: ApplicationFiled: November 27, 2007Publication date: June 19, 2008Applicant: Hitachi, Ltd.Inventors: Yoshihiko AKAGI, Hidefumi IWAKI, Kenji ONO
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Patent number: 7270118Abstract: In an engine having a premixed combustion mode, an EGR flow rate estimating precision is deteriorated at a transient time, and a torque fluctuation and an exhaust gas deterioration are caused. In an engine control apparatus having a premixed combustion mode and a diffusion combustion mode, a sensor detecting an EGR flow rate is arranged in an EGR flow path of the engine, and a cylinder state of the engine is estimated by using an output value of the sensor detecting the EGR flow rate at a time when the engine is in the premixed combustion mode. Since it is possible to accurately detect the EGR flow rate at the transient time and feed back the EGR flow rate at a high response, it is possible to prevent a torque fluctuation and an exhaust gas deterioration.Type: GrantFiled: May 15, 2006Date of Patent: September 18, 2007Assignee: Hitachi, Ltd.Inventors: Shiro Yamaoka, Yoshihiro Sukegawa, Noboru Tokuyasu, Shinya Igarashi, Katsuaki Fukatsu, Takashi Kadohiro, Hidefumi Iwaki, Takanobu Ichihara
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Publication number: 20070000473Abstract: In an engine having a premixed combustion mode, an EGR flow rate estimating precision is deteriorated at a transient time, and a torque fluctuation and an exhaust gas deterioration are caused. In an engine control apparatus having a premixed combustion mode and a diffusion combustion mode, a sensor detecting an EGR flow rate is arranged in an EGR flow path of the engine, and a cylinder state of the engine is estimated by using an output value of the sensor detecting the EGR flow rate at a time when the engine is in the premixed combustion mode. Since it is possible to accurately detect the EGR flow rate at the transient time and feed back the EGR flow rate at a high response, it is possible to prevent a torque fluctuation and an exhaust gas deterioration.Type: ApplicationFiled: May 15, 2006Publication date: January 4, 2007Applicant: Hitachi, Ltd.Inventors: Shiro Yamaoka, Yoshihiro Sukegawa, Noboru Tokuyasu, Shinya Igarashi, Katsuaki Fukatsu, Takashi Kadohiro, Hidefumi Iwaki, Takanobu Ichihara