Patents by Inventor Hisashi Nakahara
Hisashi Nakahara 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: 20230022473Abstract: A fuel control device includes a combustion temperature estimation value calculation unit that calculates a temperature estimation value when a mixture of fuel and inflow air is burned using an atmospheric condition, an opening degree command value of a valve that controls the amount of air that is mixed with the fuel and burned, and an output prediction value calculated on the basis of a fuel control signal command value used for calculation of a total fuel flow rate flowing through a plurality of fuel supply systems, a fuel distribution command value calculation unit that calculates a fuel distribution command value indicating a distribution of fuel output from the fuel supply systems based on the temperature estimation value, and outputs the fuel distribution command value, and a valve opening degree calculation unit that calculates each valve opening degree of a fuel flow rate control valve of the fuel supply systems.Type: ApplicationFiled: October 5, 2022Publication date: January 26, 2023Inventors: Keisuke YAMAMOTO, Takashi SONODA, Akihiko SAITO, Fuminori FUJII, Hisashi NAKAHARA, Ryoichi HAGA, Ryuji TAKENAKA, Yoshifumi IWASAKI, Wataru AKIZUKI, Isamu MATSUMI, Naohiro SUMIMURA, Shinichi YOSHIOKA
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Patent number: 11555457Abstract: A fuel control device includes a stem fuel valve opening degree determination unit, a branch line flow rate determination unit, and a correction value determination unit. The stem fuel valve opening degree determination unit is configured to determine an opening degree of a flow rate adjustment valve of a stem fuel supply line. The branch line flow rate determination unit is configured to determine an opening degree of a flow rate adjustment valve of at least one branch line. The correction value determination unit is configured to determine a correction value of the opening degree of the flow rate adjustment valve of the at least one branch line based on a value of a pressure difference between a fuel pressure upstream of a nozzle connected to the at least one branch line and a corrected fuel pressure for a fuel pressure at an outlet.Type: GrantFiled: March 8, 2017Date of Patent: January 17, 2023Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Kenji Miyamoto, Kotaro Miyauchi, Hisashi Nakahara, Kiyoshi Fujimoto
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Patent number: 11492981Abstract: A fuel control device includes a combustion temperature estimation value calculation unit that calculates a temperature estimation value when a mixture of fuel and inflow air is burned using an atmospheric condition, an opening degree command value of a valve that controls the amount of air that is mixed with the fuel and burned, and an output prediction value calculated on the basis of a fuel control signal command value used for calculation of a total fuel flow rate flowing through a plurality of fuel supply systems, a fuel distribution command value calculation unit that calculates a fuel distribution command value indicating a distribution of fuel output from the fuel supply systems based on the temperature estimation value, and outputs the fuel distribution command value, and a valve opening degree calculation unit that calculates each valve opening degree of a fuel flow rate control valve of the fuel supply systems.Type: GrantFiled: February 16, 2015Date of Patent: November 8, 2022Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Keisuke Yamamoto, Takashi Sonoda, Akihiko Saito, Fuminori Fujii, Hisashi Nakahara, Ryoichi Haga, Ryuji Takenaka, Yoshifumi Iwasaki, Wataru Akizuki, Isamu Matsumi, Naohiro Sumimura, Shinichi Yoshioka
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Patent number: 11421886Abstract: A gas turbine fuel flow rate setting device includes a flow rate ratio computing unit and a flow rate computing unit. The flow rate ratio computing unit is configured to accept a parameter having a correlation with a gas turbine output, and use a predetermined flow rate ratio relationship between the parameter and a fuel flow rate ratio between a plurality of premixing nozzle groups to determine a fuel flow rate ratio corresponding to the parameter which has been accepted. The flow rate computing unit is configured to use the fuel flow rate ratio determined by the flow rate ratio computing unit to determine a flow rate of a fuel to be supplied to each of the plurality of premixing nozzle groups.Type: GrantFiled: July 7, 2016Date of Patent: August 23, 2022Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Yoji Endo, Hisashi Nakahara
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Patent number: 11181047Abstract: A gas turbine fuel supply system includes a fuel supply flow passage that includes a fuel gas heater which heats fuel and supplies the fuel heated by the fuel gas heater to a first nozzle and a second nozzle, a bypass flow passage that supplies the fuel to the first nozzle without passing through the fuel supply flow passage, and a bypass fuel flow rate adjusting valve that adjusts a flow rate of the fuel flowing in the bypass flow passage.Type: GrantFiled: November 27, 2018Date of Patent: November 23, 2021Assignee: Mitsubishi Power, Ltd.Inventors: Makoto Kishi, Keisuke Yamamoto, Hiroyuki Nakagawa, Hisashi Nakahara, Shinya Uchida, Ryo Koto
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Publication number: 20210172385Abstract: A gas turbine fuel supply system includes a fuel supply flow passage that includes a fuel gas heater which heats fuel and supplies the fuel heated by the fuel gas heater to a first nozzle and a second nozzle, a bypass flow passage that supplies the fuel to the first nozzle without passing through the fuel supply flow passage, and a bypass fuel flow rate adjusting valve that adjusts a flow rate of the fuel flowing in the bypass flow passage.Type: ApplicationFiled: November 27, 2018Publication date: June 10, 2021Inventors: Makoto KISHI, Keisuke YAMAMOTO, Hiroyuki NAKAGAWA, Hisashi NAKAHARA, Shinya UCHIDA, Ryo KOTO
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Publication number: 20210148291Abstract: A control device selects and executes any of normal control of outputting a fuel flow rate command value through feedback control based on a deviation between a target output and an actual output of a gas turbine and load decreasing control of outputting the fuel flow rate command value for reducing an output of the gas turbine to a predetermined target output during a predetermined first time without performing feedback control, and performs control of reducing a flow rate of air flowing into a compressor of the gas turbine such that an air-fuel ratio settles within a predetermined range, in parallel with execution of the load decreasing control when the load decreasing control is selected.Type: ApplicationFiled: November 30, 2018Publication date: May 20, 2021Inventors: Keisuke YAMAMOTO, Kazushige TAKAKI, Makoto KISHI, Shinya UCHIDA, Hisashi NAKAHARA, Hikaru KATANO, Yoshikazu UI
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Publication number: 20200291872Abstract: A fuel control device includes a stem fuel valve opening degree determination unit, a branch line flow rate determination unit, and a correction value determination unit. The stem fuel valve opening degree determination unit is configured to determine an opening degree of a flow rate adjustment valve of a stem fuel supply line. The branch line flow rate determination unit is configured to determine the opening degree of each flow rate adjustment valve of the branch line based on an operation situation of the gas turbine. The correction value determination unit is configured to determine a correction value of the opening degree of each flow rate adjustment valve of the branch line based on a value of a pressure difference between a fuel pressure upstream of each of nozzles connected to the branch lines respectively and a corrected fuel pressure for the fuel pressure at an outlet.Type: ApplicationFiled: March 8, 2017Publication date: September 17, 2020Inventors: Kenji MIYAMOTO, Kotaro MIYAUCHI, Hisashi NAKAHARA, Kiyoshi FUJIMOTO
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Patent number: 10378448Abstract: A water supplying step of supplying water to a liquid-fuel channel of a nozzle is executed during a liquid fuel supply state in which only liquid fuel is supplied to the nozzle; a post-switch water purging step of supplying water to the liquid-fuel channel of the nozzle is executed during a gas fuel supply state in which only gas fuel is supplied to the nozzle; and a mid-switch water purging step of supplying water to the liquid-fuel channel of the nozzle is executed during a fuel switching state which is a state of transition from the liquid fuel supply state to the liquid fuel supply state. A second flow rate of water supplied in the mid-switch water purging step is lower than a first flow rate of water supplied in the water supplying step. In the post-switch water purging step, water is temporarily supplied at a third flow rate which is higher than the second flow rate.Type: GrantFiled: May 28, 2015Date of Patent: August 13, 2019Assignee: MITSUBISHI HITACHI POWER SYSTEMS, LTD.Inventor: Hisashi Nakahara
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Patent number: 10331064Abstract: In a first image formation mode, an image is formed with a first development contrast C1 and a specific dot pattern is formed with a second development contrast C2, which is lower than the first development contrast C1; in a second image formation mode, an image is formed with a third development contrast C3 and a specific dot pattern is formed with a fourth development contrast C4, which is lower than the third development contrast C3; and when ?C1 (=C2/C1) denotes a ratio between the second development contrast C2 and the first development contrast C1, and ?C2 (=C4/C3) denotes a ratio between the fourth development contrast C4 and the third development contrast C3, ?C2<?C1 is satisfied.Type: GrantFiled: January 19, 2018Date of Patent: June 25, 2019Assignee: CANON KABUSHIKI KAISHAInventors: Yusuke Hirota, Hisashi Nakahara, Akihiko Uchiyama
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Patent number: 10274878Abstract: An image forming apparatus includes a fixing unit including a heating member and a pressure member forming a nip portion with the heating member, an air blowing unit including a fan, an opening portion, and an adjustment member for adjusting an opening width of the opening portion, a control unit controlling the fan, and a temperature detection member detecting a temperature of an area, serving as a non-sheet passing area in a recording material having a predetermined size, in a non-air blowing area in the heating member closer to the center of the heating member than the opening portion in a width direction of the recording material, and the recording material having a width by which a part of the non-air blowing area is overlapped with the non-sheet passing area, and the control unit controls the fan according to a temperature detected by the temperature detection member.Type: GrantFiled: August 30, 2017Date of Patent: April 30, 2019Assignee: Canon Kabushiki KaishaInventors: Ryo Suzuki, Hisashi Nakahara
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Patent number: 10168633Abstract: An image forming apparatus includes a controller capable of executing a normal mode in which an electrostatic image formed on an image bearing member is developed by setting a peripheral velocity ratio of a developer bearing member relative to the image bearing member to a prescribed peripheral velocity ratio, and a color gamut enlargement mode in which a color gamut of an image to be formed on a recording medium is enlarged as compared to the normal mode by setting the peripheral velocity ratio of the developer bearing member relative to the image bearing member to a larger peripheral velocity ratio than the peripheral velocity ratio in the normal mode, wherein the controller identifies image color gamut information included in image data and forms an image by selecting the normal mode or the color gamut enlargement mode in accordance with the image color gamut information.Type: GrantFiled: March 15, 2017Date of Patent: January 1, 2019Assignee: Canon Kabushiki KaishaInventors: Hisashi Nakahara, Akihiko Uchiyama
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Publication number: 20180299131Abstract: A gas turbine fuel flow rate setting device includes a flow rate ratio computing unit and a flow rate computing unit. The flow rate ratio computing unit accepts a parameter having a correlation with a gas turbine output, and uses a predetermined flow rate ratio relationship between the parameter and a fuel flow rate ratio between a plurality of premixing nozzle groups to determine a fuel flow rate ratio corresponding to the accepted parameter. The flow rate computing unit uses the fuel flow rate ratio determined by the flow rate ratio computing unit to determine a flow rate of a fuel to be supplied to each of the plurality of premixing nozzle groups.Type: ApplicationFiled: July 7, 2016Publication date: October 18, 2018Applicant: Mitsubishi Hitachi Power Systems, Ltd.Inventors: Yoji ENDO, Hisashi NAKAHARA
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Patent number: 10101695Abstract: An image heating apparatus including a supporting member having (a) a hole in which a temperature detecting element is disposed so as to contact a second surface of a heat-conductive member, and (b) an opposing surface that (i) opposes the second surface of the heat-conductive member, and (ii) includes a contact region contacting the second surface of the heat-conductive member, the opposing surface of the supporting member being provided adjacent to the hole of the supporting member in a longitudinal direction of the heater. The contact region of the supporting member presses, toward the heater, a part of the heat-conductive member corresponding to the contact region of the supporting member, and the temperature detecting element presses, toward the heater, a part of the heat-conductive member corresponding to the hole of the supporting member.Type: GrantFiled: June 15, 2017Date of Patent: October 16, 2018Assignee: Canon Kabushiki KaishaInventors: Yasuhiro Shimura, Hideaki Yonekubo, Hisashi Nakahara, Akira Kato, Noriaki Tanaka, Hideyuki Matsubara, Yuji Fujiwara
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Image forming apparatus with controllable velocity ratio between image and developer bearing members
Patent number: 10018951Abstract: A control portion has a conversion portion that converts image data to be used for forming a recorded image by using either a first conversion condition which has been set such as to obtain a first gradation characteristic in the image to be formed on the recording material when a first image forming operation is executed or a second conversion condition which has been set such as to obtain a second gradation characteristic, which is different from the first gradation characteristic, in the image when a second image forming operation is executed, a peripheral velocity ratio between an image bearing member and a developer bearing member being larger during the second image forming operation than during the first image forming operation, and enables the first image forming operation or the second image forming operation to be performed on the basis of converted image data.Type: GrantFiled: March 29, 2017Date of Patent: July 10, 2018Assignee: Canon Kabushiki KaishaInventors: Tohru Saito, Akihiko Uchiyama, Hisashi Nakahara, Go Shindo -
Publication number: 20180143573Abstract: In a first image formation mode, an image is formed with a first development contrast C1 and a specific dot pattern is formed with a second development contrast C2, which is lower than the first development contrast C1; in a second image formation mode, an image is formed with a third development contrast C3 and a specific dot pattern is formed with a fourth development contrast C4, which is lower than the third development contrast C3; and when ?C1 (=C2/C1) denotes a ratio between the second development contrast C2 and the first development contrast C1, and ?C2 (=C4/C3) denotes a ratio between the fourth development contrast C4 and the third development contrast C3, ?C2<?C1 is satisfied.Type: ApplicationFiled: January 19, 2018Publication date: May 24, 2018Inventors: Yusuke Hirota, Hisashi Nakahara, Akihiko Uchiyama
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Publication number: 20180059590Abstract: An image forming apparatus includes a fixing unit including a heating member and a pressure member forming a nip portion with the heating member, an air blowing unit including a fan, an opening portion, and an adjustment member for adjusting an opening width of the opening portion, a control unit controlling the fan, and a temperature detection member detecting a temperature of an area, serving as a non-sheet passing area in a recording material having a predetermined size, in a non-air blowing area in the heating member closer to the center of the heating member than the opening portion in a width direction of the recording material, and the recording material having a width by which a part of the non-air blowing area is overlapped with the non-sheet passing area, and the control unit controls the fan according to a temperature detected by the temperature detection member.Type: ApplicationFiled: August 30, 2017Publication date: March 1, 2018Inventors: Ryo Suzuki, Hisashi Nakahara
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Patent number: 9904225Abstract: In a first image formation mode, an image is formed with a first development contrast C1 and a specific dot pattern is formed with a second development contrast C2, which is lower than the first development contrast C1; in a second image formation mode, an image is formed with a third development contrast C3 and a specific dot pattern is formed with a fourth development contrast C4, which is lower than the third development contrast C3; and when ?C1 (=C2/C1) denotes a ratio between the second development contrast C2 and the first development contrast C1, and ?C2 (=C4/C3) denotes a ratio between the fourth development contrast C4 and the third development contrast C3, ?C2<?C1 is satisfied.Type: GrantFiled: March 17, 2017Date of Patent: February 27, 2018Assignee: Canon Kabushiki KaishaInventors: Yusuke Hirota, Hisashi Nakahara, Akihiko Uchiyama
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Publication number: 20170285546Abstract: A control portion has a conversion portion that converts image data to be used for forming a recorded image by using either a first conversion condition which has been set such as to obtain a first gradation characteristic in the image to be formed on the recording material when a first image forming operation is executed or a second conversion condition which has been set such as to obtain a second gradation characteristic, which is different from the first gradation characteristic, in the image when a second image forming operation is executed, a peripheral velocity ratio between an image bearing member and a developer bearing member being larger during the second image forming operation than during the first image forming operation, and enables the first image forming operation or the second image forming operation to be performed on the basis of converted image data.Type: ApplicationFiled: March 29, 2017Publication date: October 5, 2017Inventors: Tohru Saito, Akihiko Uchiyama, Hisashi Nakahara, Go Shindo
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Publication number: 20170285543Abstract: An image heating apparatus includes: a heater including a substrate and a heat generating element; a supporting member; a high heat-conductive member. The recording material on which an image is formed is heated by heat from the heater. The supporting member has a bottom region, where the supporting member supports the heater, including a first region where the supporting member contacts the high heat-conductive member so as to apply pressure between the heater and the high heat-conductive member and including a second region where the supporting member is recessed from the high heat-conductive member relative to the first region. At least a part of the first region overlaps, with respect to a movement direction of the recording material, with a region where the heat generating element is provided.Type: ApplicationFiled: June 15, 2017Publication date: October 5, 2017Inventors: Yasuhiro Shimura, Hideaki Yonekubo, Hisashi Nakahara, Akira Kato, Noriaki Tanaka, Hideyuki Matsubara, Yuji Fujiwara