Patents by Inventor Rena KUSACHI

Rena KUSACHI 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).

  • Patent number: 11149965
    Abstract: When a hot water supply operation is started, a single mode is used in which hot water is output only from a second hot water supply circuit of a water heater, by cut-off of a flow path in a first hot water supply circuit of a space-heating water heater by a cut-off mechanism. When a load imposed by hot water supply by the second hot water supply circuit increases during the hot water supply operation in the single mode, the cut-off mechanism is opened to start hot water output from the first hot water supply circuit and a hot water supply operation in a parallel mode is performed in which hot water is output from both of the first hot water supply circuit and the second hot water supply circuit.
    Type: Grant
    Filed: June 20, 2018
    Date of Patent: October 19, 2021
    Assignee: NORITZ CORPORATION
    Inventors: Rena Kusachi, Yoshifumi Atobe, Naoki Tsuda, Keiichiro Iwanami, Hiroshi Morimoto, Akihisa Kageyama, Takehito Yokoyama, Midori Yokoyama
  • Publication number: 20180372343
    Abstract: When a hot water supply operation is started, a single mode is used in which hot water is output only from a second hot water supply circuit of a water heater, by cut-off of a flow path in a first hot water supply circuit of a space-heating water heater by a cut-off mechanism. When a load imposed by hot water supply by the second hot water supply circuit increases during the hot water supply operation in the single mode, the cut-off mechanism is opened to start hot water output from the first hot water supply circuit and a hot water supply operation in a parallel mode is performed in which hot water is output from both of the first hot water supply circuit and the second hot water supply circuit.
    Type: Application
    Filed: June 20, 2018
    Publication date: December 27, 2018
    Applicant: NORITZ CORPORATION
    Inventors: Rena Kusachi, Yoshifumi Atobe, Naoki Tsuda, Keiichiro Iwanami, Hiroshi Morimoto, Akihisa Kageyama, Takehito Yokoyama, Midori Yokoyama
  • Patent number: 9879859
    Abstract: In a suction fan type combustion apparatus, when an air supply/exhaust path of a combustion and heating unit is clogged, a combustion fan has a degraded fan current for the same fan rotation speed. Furthermore, the suction fan type configuration has the combustion and heating unit's internal pressure reduced as the combustion fan rotates faster. A combustion burner supplies fuel gas with a pressure applied thereto, which is regulated by a gas proportional valve. A degree of opening of the gas proportional valve is corrected in a direction allowing the pressure to be reduced, in accordance with a rate of degradation of a fan current relative to a reference current following a reference current characteristic. This control for correction is done with the fan current degradation rate smoothed (or low-pass filtered) in a time base direction.
    Type: Grant
    Filed: July 22, 2015
    Date of Patent: January 30, 2018
    Assignee: NORITZ CORPORATION
    Inventors: Rena Kusachi, Daisuke Konishi, Kenichi Nakayama
  • Patent number: 9557076
    Abstract: By a feedback arithmetic operation based on a temperature deviation, an input number is set which corresponds to a requested heat quantity generation, which is a controlled object, to a hot water supply apparatus. The temperature deviation is calculated by correcting a deviation of a tapping temperature with respect to a set hot water temperature with use of a Smith compensation temperature calculated by a Smith compensator for predicting a variation in a tapping temperature prior to an elapse of a dead time corresponding to a detection lag of the tapping temperature. The Smith compensator calculates a Smith compensation temperature to be used in the next control cycle based on the input scale number, the present Smith compensation temperature, and a time constant set in accordance with a flow rate of the hot water supply apparatus.
    Type: Grant
    Filed: January 7, 2014
    Date of Patent: January 31, 2017
    Assignee: NORITZ CORPORATION
    Inventors: Rena Kusachi, Yuki Maeshima, Hiroki Nabeshima, Kenichi Nakayama
  • Patent number: 9507354
    Abstract: A conversion factor learning unit successively updates a temperature conversion factor by learning a performance ratio of an output heat quantity with respect to an input scale number corresponding to a requested heat quantity generation to a hot water supply apparatus. The temperature conversion factor learned by the conversion factor learning unit is reflected in arithmetic operation of an FF scale number by a feedforward control unit and arithmetic operation of the FB scale number by the feedback control unit. An integral control in the feedback control unit is preferably turned off.
    Type: Grant
    Filed: January 7, 2014
    Date of Patent: November 29, 2016
    Assignee: NORITZ CORPORATION
    Inventors: Rena Kusachi, Kenichi Nakayama, Hiroki Nabeshima, Yuki Maeshima
  • Publication number: 20160076768
    Abstract: In a suction fan type combustion apparatus, when an air supply/exhaust path of a combustion and heating unit is clogged, a combustion fan has a degraded fan current for the same fan rotation speed. Furthermore, the suction fan type configuration has the combustion and heating unit's internal pressure reduced as the combustion fan rotates faster. A combustion burner supplies fuel gas with a pressure applied thereto, which is regulated by a gas proportional valve. A degree of opening of the gas proportional valve is corrected in a direction allowing the pressure to be reduced, in accordance with a rate of degradation of a fan current relative to a reference current following a reference current characteristic. This control for correction is done with the fan current degradation rate smoothed (or low-pass filtered) in a time base direction.
    Type: Application
    Filed: July 22, 2015
    Publication date: March 17, 2016
    Applicant: NORITZ CORPORATION
    Inventors: Rena KUSACHI, Daisuke KONISHI, Kenichi NAKAYAMA
  • Publication number: 20140202679
    Abstract: By a feedback arithmetic operation based on a temperature deviation, an input number is set which corresponds to a requested heat quantity generation, which is a controlled object, to a hot water supply apparatus. The temperature deviation is calculated by correcting a deviation of a tapping temperature with respect to a set hot water temperature with use of a Smith compensation temperature calculated by a Smith compensator for predicting a variation in a tapping temperature prior to an elapse of a dead time corresponding to a detection lag of the tapping temperature. The Smith compensator calculates a Smith compensation temperature to be used in the next control cycle based on the input scale number, the present Smith compensation temperature, and a time constant set in accordance with a flow rate of the hot water supply apparatus.
    Type: Application
    Filed: January 7, 2014
    Publication date: July 24, 2014
    Applicant: NORITZ CORPORATION
    Inventors: Rena KUSACHI, Yuki MAESHIMA, Hiroki NABESHIMA, Kenichi NAKAYAMA
  • Publication number: 20140202680
    Abstract: A conversion factor learning unit successively updates a temperature conversion factor by learning a performance ratio of an output heat quantity with respect to an input scale number corresponding to a requested heat quantity generation to a hot water supply apparatus. The temperature conversion factor learned by the conversion factor learning unit is reflected in arithmetic operation of an FF scale number by a feedforward control unit and arithmetic operation of the FB scale number by the feedback control unit. An integral control in the feedback control unit is preferably turned off.
    Type: Application
    Filed: January 7, 2014
    Publication date: July 24, 2014
    Applicant: NORITZ CORPORATION
    Inventors: Rena KUSACHI, Kenichi NAKAYAMA, Hiroki NABESHIMA, Yuki MAESHIMA