Patents by Inventor Takeshi Hikawa
Takeshi Hikawa 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: 11898783Abstract: A performance degradation diagnosis system includes a determining unit, and control unit. A refrigeration cycle apparatus includes a refrigerant circuit having a compressor, heat-source-side heat exchanger, and use-side heat exchanger. The determining unit determines, based on an index indicating an operation state of the refrigeration cycle apparatus, performance degradation of the refrigeration cycle apparatus with respect to each of a plurality of performance degradation factors. In a case in which the determining unit determines performance degradation, the control unit grasps an operation condition of the refrigeration cycle apparatus which is operating.Type: GrantFiled: March 30, 2020Date of Patent: February 13, 2024Assignee: Daikin Industries, Ltd.Inventors: Shuji Fujimoto, Akihiro Inao, Shizuka Sadai, Shinichi Kasahara, Takeshi Hikawa
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Publication number: 20220268503Abstract: A refrigerant amount determining device includes: an operation data acquiring unit configured to acquire operation data of an air conditioning system; a calculating unit configured to calculate a refrigerant amount index value from the operation data acquired; an inferring unit configured to infer information regarding correction of the refrigerant amount index value using a correction model and at least one of the acquired operation data or the calculated refrigerant amount index value; and a determining unit configured to determine a refrigerant amount of the air conditioning system based on the information regarding correction of the refrigerant amount index value.Type: ApplicationFiled: July 29, 2020Publication date: August 25, 2022Inventors: Manabu YOSHIMI, Takeshi HIKAWA, Shinichi KASAHARA, Shohei YAMADA, Hiroyuki KAGITANI, Hidetaka KISHIMOTO
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Publication number: 20220170679Abstract: A performance degradation diagnosis system includes a determining unit, and control unit. A refrigeration cycle apparatus includes a refrigerant circuit having a compressor, heat-source-side heat exchanger, and use-side heat exchanger. The determining unit determines, based on an index indicating an operation state of the refrigeration cycle apparatus, performance degradation of the refrigeration cycle apparatus with respect to each of a plurality of performance degradation factors. In a case in which the determining unit determines performance degradation, the control unit grasps an operation condition of the refrigeration cycle apparatus which is operating.Type: ApplicationFiled: March 30, 2020Publication date: June 2, 2022Inventors: Shuji FUJIMOTO, Akihiro INAO, Shizuka SADAI, Shinichi KASAHARA, Takeshi HIKAWA
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Patent number: 11346570Abstract: A refrigerant leakage determination system capable of detecting leakage of refrigerant without requiring complicated processing is provided. A refrigerant leakage determination system is a refrigerant leakage determination system of a refrigeration cycle apparatus that includes a refrigerant circuit including a heat-source-side heat exchanger and has, as operating modes, a normal mode in which the heat-source-side heat exchanger is caused to function as an evaporator and a defrosting mode in which the heat-source-side heat exchanger frosted during a normal operation is defrosted. The refrigerant leakage determination system includes a processor configured to acquire defrosting information regarding a relationship between a normal operation period and the number of defrosting operations, and memory that stores the defrosting information. The processor is further configured to determine, based on the acquired defrosting information, leakage of refrigerant in the refrigerant circuit.Type: GrantFiled: November 29, 2019Date of Patent: May 31, 2022Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Manabu Yoshimi, Takeshi Hikawa
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Patent number: 11274846Abstract: A refrigerant leakage determination system capable of detecting leakage of refrigerant without requiring complicated processing is provided. A refrigerant leakage determination system is a refrigerant leakage determination system of a refrigeration cycle apparatus that includes a refrigerant circuit including a heat-source-side heat exchanger and has, as operating modes, a normal mode in which the heat-source-side heat exchanger is caused to function as an evaporator and a defrosting mode in which the heat-source-side heat exchanger frosted during a normal operation is defrosted. The refrigerant leakage determination system includes a processor configured to acquire defrosting information regarding a relationship between a normal operation period and the number of defrosting operations, and memory that stores the defrosting information. The processor is further configured to determine, based on the acquired defrosting information, leakage of refrigerant in the refrigerant circuit.Type: GrantFiled: November 29, 2019Date of Patent: March 15, 2022Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Manabu Yoshimi, Takeshi Hikawa
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Publication number: 20210356155Abstract: A refrigerant leakage determination system capable of detecting leakage of refrigerant without requiring complicated processing is provided. A refrigerant leakage determination system is a refrigerant leakage determination system of a refrigeration cycle apparatus that includes a refrigerant circuit including a heat-source-side heat exchanger and has, as operating modes, a normal mode in which the heat-source-side heat exchanger is caused to function as an evaporator and a defrosting mode in which the heat-source-side heat exchanger frosted during a normal operation is defrosted. The refrigerant leakage determination system includes a processor configured to acquire defrosting information regarding a relationship between a normal operation period and the number of defrosting operations, and memory that stores the defrosting information. The processor is further configured to determine, based on the acquired defrosting information, leakage of refrigerant in the refrigerant circuit.Type: ApplicationFiled: November 29, 2019Publication date: November 18, 2021Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Manabu YOSHIMI, Takeshi HIKAWA
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Publication number: 20210341170Abstract: To highly accurately determine whether a refrigerant amount in a refrigerant circuit is appropriate. An air conditioning apparatus comprises a refrigerant circuit in which a plurality of indoor units respectively including an indoor heat exchanger and an indoor expansion valve are connected to an outdoor unit including an outdoor expansion valve via a liquid-refrigerant connection pipe. Moreover, the air conditioning apparatus individually controls each of the indoor units to operate or stop. The air conditioning apparatus includes a controller. When at least one of the indoor heat exchangers functions as a radiator, the controller controls an opening degree of the indoor expansion valve and an opening degree of the outdoor expansion valve. The apparatus determines whether a refrigerant amount in the refrigerant circuit is appropriate on the basis of an amount of change corresponding to a change in state of a refrigerant between the indoor expansion valve and the outdoor expansion valve.Type: ApplicationFiled: September 27, 2019Publication date: November 4, 2021Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Takeshi HIKAWA, Shinichi KASAHARA, Manabu YOSHIMI
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Patent number: 8011198Abstract: To reduce a leakage current when a motor for driving a compressor is energized, with the compressor unoperated. Setting the carrier frequency of an inverter at a value lower than that used during normal operation to cause phase interruption electrification of the motor.Type: GrantFiled: April 22, 2005Date of Patent: September 6, 2011Assignee: Daikin Industries, Ltd.Inventors: Satoshi Ishikawa, Takeshi Hikawa, Toshiyuki Maeda, Sumikazu Matsuno
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Publication number: 20110011101Abstract: A turbine generator is formed with a gas-refrigerant storage space over a power generation mechanism inside of a casing and a liquid-refrigerant storage space under the power generation mechanism. The turbine generator is provided with a gas-refrigerant outlet pipe penetrating the casing and leading to the gas-refrigerant storage space and a liquid-refrigerant outlet pipe penetrating the casing and leading to the liquid-refrigerant storage space.Type: ApplicationFiled: September 22, 2008Publication date: January 20, 2011Applicant: Daikin Industries, Ltd.Inventors: Takeshi Hikawa, Takahiro Yamaguchi
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Patent number: 7392158Abstract: An instantaneous current and instantaneous voltage of a three-phase coil of a brushless DC motor are detected, and the internal condition of a compressor is predicted from these detection values. The prediction about the internal condition of the compressor is made in such a way that motor driving torque which is a parameter of a motor model is identified and poor lubrication, liquid compression or the like is predicted from this identified motor driving torque. This enables it to make, in real time, a failure forecast, failure diagnosis etc. on the compressor.Type: GrantFiled: July 24, 2003Date of Patent: June 24, 2008Assignee: Daikin Industries, Ltd.Inventors: Takeshi Hikawa, Toshiyuki Maeda, Shinichi Kasahara, Takahiro Yamaguchi, Shigenobu Izumi, Kiyoshi Koizumi, Masanobu Kita
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Publication number: 20080134702Abstract: To reduce a leakage current when a motor for driving a compressor is energized, with the compressor unoperated. Setting the carrier frequency of an inverter at a value lower than that used during normal operation to cause phase interruption electrification of the motor.Type: ApplicationFiled: April 22, 2005Publication date: June 12, 2008Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Satoshi Ishikawa, Takeshi Hikawa, Toshiyuki Maeda, Sumikazu Matsuno
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Patent number: 7265954Abstract: Resistance of the coil of a DC motor is calculated by using the motor current and the motor voltage, and the coil temperature is estimated by using the resistance-temperature characteristics of the coil.Type: GrantFiled: October 22, 2004Date of Patent: September 4, 2007Assignee: Daikin Industries, Ltd.Inventors: Takeshi Hikawa, Satoshi Ishikawa, Yasuto Yanagida
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Publication number: 20070070560Abstract: Resistance of the coil of a DC motor is calculated by using the motor current and the motor voltage, and the coil temperature is estimated by using the resistance-temperature characteristics of the coil.Type: ApplicationFiled: October 22, 2004Publication date: March 29, 2007Applicant: Daikin Industries, Ltd.Inventors: Takeshi Hikawa, Satoshi Ishikawa, Yasuto Yanagida
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Publication number: 20050247073Abstract: An instantaneous current and instantaneous voltage of a three-phase coil of a brushless DC motor are detected, and the internal condition of a compressor is predicted from these detection values. The prediction about the internal condition of the compressor is made in such a way that motor driving torque which is a parameter of a motor model is identified and poor lubrication, liquid compression or the like is predicted from this identified motor driving torque. This enables it to make, in real time, a failure forecast, failure diagnosis etc. on the compressor.Type: ApplicationFiled: July 24, 2003Publication date: November 10, 2005Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Takeshi Hikawa, Toshiyuki Maeda, Shinichi Kasahara, Takahiro Yamaguchi, Shigenobu Izumi, Kiyoshi Koizumi, Masanobu Kita
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Publication number: 20050175492Abstract: A high pressure chamber in a casing communicates at the bottom thereof with a liquid retainer. A communication pipe is connected at one end thereof to the upper end of the liquid retainer and connected at the other end thereof to an intake pipe. A gas container and first and second solenoid valves are provided in the communication pipe. When the first solenoid valve is closed and the second solenoid valve (37) is opened, the gas container communicates with the intake pipe to reduce the pressure in the gas container. Thereafter, when the first solenoid valve is opened and the second solenoid valve (37) is closed, the gas container communicates with the liquid retainer to reduce the pressure in the liquid retainer. Then, the pressure of lubricant oil in the liquid retainer is lowered to gasify a refrigerant dissolving in the lubricant oil.Type: ApplicationFiled: April 9, 2004Publication date: August 11, 2005Applicant: Daikin Industries, Ltd.Inventors: Katsumi Hirooka, Takeshi Hikawa