Patents by Inventor Hiroki IGUMA
Hiroki IGUMA 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: 11808320Abstract: A rolling vibration reduction device for an internal combustion engine includes: a main inertial system configured to rotate with a crankshaft of the internal combustion engine; a driving force transmission mechanism configured to transmit a rotational driving force of the crankshaft, a direction of the rotational driving force being reversed by the driving force transmission mechanism; and a sub-inertial system configured to rotate by the rotational driving force transmitted from the driving force transmission mechanism and to reduce rolling vibration of the internal combustion engine associated with rotation of the crankshaft by rotating in an opposite direction to the crankshaft. A torsional resonance frequency in the rolling vibration reduction device is set to a value higher than an explosion primary frequency at a maximum engine speed in a preset operating region of the internal combustion engine.Type: GrantFiled: March 21, 2022Date of Patent: November 7, 2023Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hiroki Iguma, Ryota Tsuda, Tomohito Ono, Keiju Tomoda
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Patent number: 11459968Abstract: An engine misfire detection device is mounted on a hybrid electric vehicle that includes an internal combustion engine and a generator. The internal combustion engine has a plurality of cylinders and a crankshaft and is dedicated to power generation. The generator is connected to the crankshaft via a torsional damper. The engine misfire detection device includes a generator rotation angle sensor and a processor. The generator rotation angle sensor detects the rotation angle of the generator rotating shaft. The processor is configured to execute a misfire detection process. The misfire detection process includes a first misfire detection process of determining that the internal combustion engine has misfired when an amplitude correlation value that correlates with the magnitude of amplitude of rotation speed of the generator rotating shaft and is detected by the generator rotation angle sensor is greater than a determination threshold value.Type: GrantFiled: November 9, 2021Date of Patent: October 4, 2022Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Shintaro Hotta, Yuya Takahashi, Hiroki Iguma, Hideto Wakabayashi
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Patent number: 11458830Abstract: A powertrain system includes an internal combustion engine, a motor generator and a control device. The motor generator includes a rotating shaft connected to a crankshaft of the internal combustion engine via a torsional damper. The powertrain system is configured such that the crankshaft and the above-described rotating shaft are not connected to a drive shaft of a vehicle at least at the time of engine start. The control device is configured to execute a cranking torque amplification control that controls the motor generator such that the MG torque output from the motor generator for cranking the internal combustion engine fluctuates in a resonant period of the torsional damper while making a fluctuation center of the MG torque higher than zero.Type: GrantFiled: December 9, 2020Date of Patent: October 4, 2022Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hiroki Iguma, Tomohito Ono, Hiroto Hashimoto, Daisuke Shirai
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Publication number: 20220307571Abstract: A rolling vibration reduction device for an internal combustion engine includes: a main inertial system configured to rotate with a crankshaft of the internal combustion engine; a driving force transmission mechanism configured to transmit a rotational driving force of the crankshaft, a direction of the rotational driving force being reversed by the driving force transmission mechanism; and a sub-inertial system configured to rotate by the rotational driving force transmitted from the driving force transmission mechanism and to reduce rolling vibration of the internal combustion engine associated with rotation of the crankshaft by rotating in an opposite direction to the crankshaft. A torsional resonance frequency in the rolling vibration reduction device is set to a value higher than an explosion primary frequency at a maximum engine speed in a preset operating region of the internal combustion engine.Type: ApplicationFiled: March 21, 2022Publication date: September 29, 2022Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hiroki Iguma, Ryota Tsuda, Tomohito Ono, Keiju Tomoda
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Publication number: 20220145820Abstract: An engine misfire detection device is mounted on a hybrid electric vehicle that includes an internal combustion engine and a generator. The internal combustion engine has a plurality of cylinders and a crankshaft and is dedicated to power generation. The generator is connected to the crankshaft via a torsional damper. The engine misfire detection device includes a generator rotation angle sensor and a processor. The generator rotation angle sensor detects the rotation angle of the generator rotating shaft. The processor is configured to execute a misfire detection process. The misfire detection process includes a first misfire detection process of determining that the internal combustion engine has misfired when an amplitude correlation value that correlates with the magnitude of amplitude of rotation speed of the generator rotating shaft and is detected by the generator rotation angle sensor is greater than a determination threshold value.Type: ApplicationFiled: November 9, 2021Publication date: May 12, 2022Inventors: Shintaro Hotta, Yuya Takahashi, Hiroki Iguma, Hideto Wakabayashi
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Publication number: 20210221215Abstract: A powertrain system includes an internal combustion engine, a motor generator and a control device. The motor generator includes a rotating shaft connected to a crankshaft of the internal combustion engine via a torsional damper. The powertrain system is configured such that the crankshaft and the above-described rotating shaft are not connected to a drive shaft of a vehicle at least at the time of engine start. The control device is configured to execute a cranking torque amplification control that controls the motor generator such that the MG torque output from the motor generator for cranking the internal combustion engine fluctuates in a resonant period of the torsional damper while making a fluctuation center of the MG torque higher than zero.Type: ApplicationFiled: December 9, 2020Publication date: July 22, 2021Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hiroki IGUMA, Tomohito ONO, Hiroto HASHIMOTO, Daisuke SHIRAI
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Patent number: 10654096Abstract: A manufacturing method for a cylinder head is described. A masking member is attached to a cylinder head material, which followed by a film formation step. The masking member comprises a mask portion to mask the matching surface with the cylinder block, mask portions to mask each of the openings of intake and exhaust ports and a mask portion to mask at least one narrow region sandwiched between openings of two adjacent port holes and has the shortest distance between opening edges of the two adjacent port holes. All Mask portions are coplanar and linked directly to each other.Type: GrantFiled: November 30, 2016Date of Patent: May 19, 2020Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hiroki Iguma, Akio Kawaguchi, Hideo Yamashita, Kazuaki Nishio
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Patent number: 10605195Abstract: A cylinder head material of an engine is casted (Step S1). Next, the cylinder head material is machined (Step S2). Next, a heat shielding film is formed on a ceiling surface of the cylinder head material (Step S3). Next, the film thickness of the heat shielding film is measured (Step S4). Next, a rank of a piston to be combined with the ceiling surface is selected (Step S5). The rank of the piston selected in Step S5 is a rank according to depth of a cavity. Next, the rank of the piston selected in Step S5 is stamped on the cylinder head (Step S6).Type: GrantFiled: January 3, 2018Date of Patent: March 31, 2020Assignee: Toyota Jidosha Kabushiki KaishaInventor: Hiroki Iguma
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Patent number: 10539093Abstract: A manufacturing method for an engine includes: preparing, as a preparing step, a cylinder head having a surface on which a ceiling surface of a combustion chamber is formed; forming, as a film formation step, a thermal insulation film on the ceiling surface; measuring, as a measurement step, a volume of the thermal insulation film; and selecting, as a selection step, a rank for an engine valve to be used in combination with the ceiling surface so as to correspond to an amount of difference of a measured volume of the thermal insulation film from a designed value of a volume of the thermal insulation film, the rank being selected from a plurality of ranks set in correspondence with thicknesses of umbrella portions of engine valves.Type: GrantFiled: October 6, 2017Date of Patent: January 21, 2020Assignee: Toyota Jidosha Kabushiki KaishaInventor: Hiroki Iguma
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Patent number: 10252323Abstract: A manufacturing method for a cylinder head is described. A masking member is attached to cylinder head material, which followed by a film formation step. The masking member comprises a mask portion to mask the matching surface with the cylinder block, and mask portions to mask each of the openings of the intake ports, the exhaust ports, and the CPS hole. Mask portions are linked directly to other mask portions without any steps.Type: GrantFiled: November 29, 2016Date of Patent: April 9, 2019Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hiroki Iguma, Akio Kawaguchi, Hideo Yamashita, Kazuaki Nishio
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Publication number: 20180252179Abstract: A cylinder head material of an engine is casted (Step S1). Next, the cylinder head material is machined (Step S2). Next, a heat shielding film is formed on a ceiling surface of the cylinder head material (Step S3). Next, the film thickness of the heat shielding film is measured (Step S4). Next, a rank of a piston to be combined with the ceiling surface is selected (Step S5). The rank of the piston selected in Step S5 is a rank according to depth of a cavity. Next, the rank of the piston selected in Step S5 is stamped on the cylinder head (Step S6).Type: ApplicationFiled: January 3, 2018Publication date: September 6, 2018Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventor: Hiroki IGUMA
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Patent number: 10066546Abstract: A heat shield film is formed on a bottom surface of a cylinder head and a heat shield film is formed on an inner peripheral surface of a small diameter hole portion. The film is a thermal spraying film made from the same film material. Since the film is thicker than the film, the film has higher thermal capacity than the film and thus heat retaining effect of the film is higher than that of the film. Therefore, combustion gas generated in a combustion chamber is suppressed to lose its momentum around the portion. Even if the combustion gas goes off around the portion, excessive temperature decrease of the combustion gas in the portion is suppressed.Type: GrantFiled: November 22, 2016Date of Patent: September 4, 2018Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hideo Yamashita, Akio Kawaguchi, Hiroki Iguma
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Patent number: 9957916Abstract: The present invention relates to an internal combustion engine. An object of the invention is to allow an effect produced by an anodic oxide film to be exerted while suppressing a decrease in the combustion rate. A piston 10 includes a cavity portion 20 and a tapered portion 26 that is formed so as to surround the cavity portion 20 on an outer side thereof. The diameter of the tapered portion 26 decreases progressively in the downward direction from the top face side of the piston. A squish portion 28 is formed on an outer side of the tapered portion 26. An anodic oxide film 30 is formed on a surface (tapered face) of the tapered portion 26 and a surface (squish face) of the squish portion 28. The anodic oxide film 30 is not formed on the surface (cavity face) of the cavity portion 20.Type: GrantFiled: September 12, 2014Date of Patent: May 1, 2018Assignee: Toyota Jidosha Kabushiki KaishaInventors: Manabu Tateno, Akio Kawaguchi, Hideyuki Nishida, Hideo Yamashita, Hiroki Iguma, Akira Yamashita, Kazuyasu Iwata
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Publication number: 20180106212Abstract: A manufacturing method for an engine includes: preparing, as a preparing step, a cylinder head having a surface on which a ceiling surface of a combustion chamber is formed; forming, as a film formation step, a thermal insulation film on the ceiling surface; measuring, as a measurement step, a volume of the thermal insulation film; and selecting, as a selection step, a rank for an engine valve to be used in combination with the ceiling surface so as to correspond to an amount of difference of a measured volume of the thermal insulation film from a designed value of a volume of the thermal insulation film, the rank being selected from a plurality of ranks set in correspondence with thicknesses of umbrella portions of engine valves.Type: ApplicationFiled: October 6, 2017Publication date: April 19, 2018Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventor: Hiroki IGUMA
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Publication number: 20180106211Abstract: A method for manufacturing an engine includes: preparing, as a preparing step, a cylinder head having a surface on which a ceiling surface of a combustion chamber is formed; forming, as a film formation step, a thermal insulation film on the ceiling surface; measuring, as a measurement step, a volume of the thermal insulation film; and selecting, as a selection step, from a plurality of ranks set in correspondence with compression heights of pistons, the rank of the piston to be combined with the ceiling surface, the selected rank corresponding to an amount of difference of the measured volume of the thermal insulation film from a design value of the volume of the thermal insulation film.Type: ApplicationFiled: October 3, 2017Publication date: April 19, 2018Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventor: Hiroki IGUMA
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Publication number: 20170209915Abstract: A manufacturing method for a cylinder head is described. A masking member is attached to cylinder head material, which followed by a film formation step. The masking member comprises a mask portion to mask the matching surface with the cylinder block, and mask portions to mask each of the openings of the intake ports, the exhaust ports, and the CPS hole. Mask portions are linked directly to other mask portions without any steps.Type: ApplicationFiled: November 29, 2016Publication date: July 27, 2017Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hiroki IGUMA, Akio KAWAGUCHI, Hideo YAMASHITA, Kazuaki NISHIO
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Publication number: 20170209916Abstract: The masking member comprises a matching surface mask portion to mask the matching surface with the cylinder block, port hole mask portions to mask openings of the intake ports and the exhaust ports, and a between openings mask portion to mask a region which is sandwiched between the openings of two adjacent port holes. The matching surface mask portion is linked directly to the port hole mask portions without any steps, and the between openings mask portion is linked directly to both of the port hole mask portions without a step.Type: ApplicationFiled: November 30, 2016Publication date: July 27, 2017Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hiroki IGUMA, Akio KAWAGUCHI, Hideo YAMASHITA, Kazuaki NISHIO
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Publication number: 20170152795Abstract: A heat shield film is formed on a bottom surface of a cylinder head and a heat shield film is formed on an inner peripheral surface of a small diameter hole portion. The film is a thermal spraying film made from the same film material. Since the film is thicker than the film, the film has higher thermal capacity than the film and thus heat retaining effect of the film is higher than that of the film. Therefore, combustion gas generated in a combustion chamber is suppressed to lose its momentum around the portion. Even if the combustion gas goes off around the portion, excessive temperature decrease of the combustion gas in the portion is suppressed.Type: ApplicationFiled: November 22, 2016Publication date: June 1, 2017Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hideo YAMASHITA, Akio KAWAGUCHI, Hiroki IGUMA
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Publication number: 20170121839Abstract: A method for manufacturing a piston for an internal combustion engine, a base material of the piston being an aluminum alloy, a cavity being formed in a top surface of the piston, includes a depositing step of depositing a porous anodic oxide coating on a portion of a surface of the base material, the portion corresponding to a wall surface of the cavity, a reinforcing step of reinforcing the anodic oxide coating deposited by the depositing step, a polishing step of forming a smoothed surface of the anodic oxide coating by polishing the anodic oxide coating reinforced by the reinforcing step, and a sealing step of applying a sealant on the smoothed surface of the anodic oxide coating formed by the polishing step.Type: ApplicationFiled: August 29, 2016Publication date: May 4, 2017Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hideo YAMASHITA, Akio KAWAGUCHI, Hiroki IGUMA
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Publication number: 20160273484Abstract: The present invention relates to an internal combustion engine. An object of the invention is to allow an effect produced by are anodic oxide film to be exerted while suppressing a decrease in the combustion rate. A piston 10 includes a cavity portion 20 and a tapered portion 26 that is formed so as to surround the cavity portion 20 on an outer side thereof. The diameter of the tapered portion 26 decreases progressively in the downward direction from the top face side of the piston. A squish portion 28 is formed on an outer side of the tapered portion 26. An anodic oxide film 30 is formed on a surface (tapered face) of the tapered portion 26 and a surface (squish face) of the squish portion 28. The anodic oxide film 30 is not formed on the surface (cavity face) of the cavity portion 20.Type: ApplicationFiled: September 12, 2014Publication date: September 22, 2016Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Manabu TATENO, Akio KAWAGUCHI, Hideyuki NISHIDA, Hideo YAMASHITA, Hiroki IGUMA, Akira YAMASHITA, Kazuyasu IWATA