Patents by Inventor Kuniaki Ojima

Kuniaki Ojima 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: 10707508
    Abstract: A fuel cell system includes a battery, a fuel cell, an air pump, and a processor. The battery stores electric power. The fuel cell supplies electric power to the battery. The air pump is driven with the electric power supplied from the battery to supply air to the fuel cell. The processor, when starting the fuel cell system, is configured to compare an amount of the electric power stored in the battery with a threshold electric power. If the amount of the electric power is higher than or equal to the threshold electric power, the air pump is driven. If the amount of the electric power is lower than the threshold electric power, the air pump is prohibited to drive.
    Type: Grant
    Filed: May 12, 2017
    Date of Patent: July 7, 2020
    Assignee: HONDA MOTOR CO., LTD.
    Inventor: Kuniaki Ojima
  • Publication number: 20200122605
    Abstract: A fuel cell system includes an air pump configured to supply air to a fuel cell, and a discharge flow rate determination unit which determines a discharge flow rate of the air pump when warming up the fuel cell, in accordance with a speed of a vehicle in which the fuel cell and the air pump are installed, or a required drive output of the vehicle. The discharge flow rate determination unit increases the discharge flow rate in the case that the speed or the required drive output is greater than or equal to a predetermined threshold value, and decreases the discharge flow rate in the case that the speed or the required drive output is less than the predetermined threshold value.
    Type: Application
    Filed: October 16, 2019
    Publication date: April 23, 2020
    Inventors: Ryoji Sakai, Akihiro Matsui, Kuniaki Ojima
  • Publication number: 20200127312
    Abstract: A fuel cell system includes a fuel cell, an air pump which supplies air to the fuel cell, a passenger presence or absence determination unit which determines the presence or absence of a passenger in a vehicle in which the fuel cell and the air pump are installed, a discharge flow rate determination unit which determines a discharge flow rate of the air pump when the fuel cell is warmed up, in accordance with the presence or absence of the passenger in the vehicle, and a control unit which controls the air pump on the basis of the discharge flow rate determined by the discharge flow rate determination unit.
    Type: Application
    Filed: October 16, 2019
    Publication date: April 23, 2020
    Inventors: Ryoji Sakai, Akihiro Matsui, Kuniaki Ojima
  • Publication number: 20200127309
    Abstract: An FC control unit selectively supplies electrical power of an FC unit to one or both of a battery and a battery heater, based on at least one of whether an SOC of the battery is higher or lower than a preset threshold value, and whether a battery temperature is higher or lower than a preset temperature threshold.
    Type: Application
    Filed: October 17, 2019
    Publication date: April 23, 2020
    Inventors: Ryoji Sakai, Akihiro Matsui, Kuniaki Ojima
  • Patent number: 10411280
    Abstract: A method of shutting down a fuel cell system includes a fuel cell includes generating power via an electrochemical reaction between a fuel gas and an oxidant gas. A shutdown command is output to the fuel cell to stop generating power. The fuel cell is controlled to continue generating power during an oxygen consumption process to consume oxygen in the oxidant gas remaining in a cathode system of the fuel cell even when the shutdown command is output to the fuel cell. At least one of voltage, current, and power output from the fuel cell is detected during the oxygen consumption process. Whether an abnormality occurs during the oxygen consumption process is determined based on at least one of the voltage, the current, and the power. The fuel cell is controlled to stop generating power during the oxygen consumption process when it is determined that abnormality occurs.
    Type: Grant
    Filed: May 24, 2017
    Date of Patent: September 10, 2019
    Assignee: HONDA MOTOR CO., LTD.
    Inventors: Kuniaki Ojima, Kenji Taruya
  • Publication number: 20190255969
    Abstract: A fuel cell system includes a FC, a TRC, an oxygen-containing gas supply apparatus, a battery, and an ECU. The ECU is capable of performing power consumption control which allows the oxygen-containing gas supply apparatus to consume electrical energy during regeneration of the TRC. The ECU is configured to determine a charge margin with respect to a charge limitation value of the battery, in a manner that the charge margin set after the power consumption control starts becomes smaller than the charge margin set before the power consumption control is performed.
    Type: Application
    Filed: February 12, 2019
    Publication date: August 22, 2019
    Inventors: Shingo Takamoto, Akio Futatsudera, Akihiro Matsui, Kuniaki Ojima, Takuto Nakagawa, Takuya Shirasaka, Kosuke Higashitani
  • Publication number: 20190237779
    Abstract: A fuel cell system includes a fuel cell, an accumulator configured to store a fuel gas, a gas remaining quantity acquisition unit configured to obtain a remaining quantity of the fuel gas stored in the accumulator, and a power generation control unit. When the remaining quantity of the fuel gas stored in the accumulator is decreased to a threshold value, the power generation control unit performs switching from humid power generation control to dry power generation control.
    Type: Application
    Filed: January 24, 2019
    Publication date: August 1, 2019
    Inventors: Masaoki Inamoto, Kuniaki Ojima
  • Publication number: 20190229357
    Abstract: A drive upper limit electrical energy for an air compressor is set variably in correspondence with vehicle velocity Vv. In this manner, for example, surplus power generation electrical energy of a fuel cell stack is consumed (discarded) by the air compressor in a range where NV (noise and vibration) of the air compressor does not give passengers any sense of discomfort.
    Type: Application
    Filed: January 17, 2019
    Publication date: July 25, 2019
    Inventors: Kuniaki Ojima, Takuto Nakagawa
  • Patent number: 10355292
    Abstract: A method of controlling a fuel cell system includes supplying a fuel gas from a fuel-gas storage container to a fuel cell via a drive valve provided in a fuel-gas path. A first pressure is detected in the fuel-gas path between a first decompression mechanism and a second decompression mechanism. A second pressure is detected in the fuel-gas path between the second decompression mechanism and the drive valve. An on-off valve is opened. The on-off valve is provided in a bypass path. The first pressure and the second pressure are compared after the on-off valve has been opened. The fuel cell system is controlled to decrease electric power generated by the fuel cell or to stop generating electric power in the fuel cell when the first pressure is not substantially equal to the second pressure.
    Type: Grant
    Filed: June 30, 2017
    Date of Patent: July 16, 2019
    Assignee: HONDA MOTOR CO., LTD.
    Inventors: Satoru Kawase, Kuniaki Ojima, Koshi Kimura
  • Patent number: 10305129
    Abstract: A fuel battery system includes a fuel battery, an electric storage, a voltage adjuster, a pump, an abnormity detector, and circuitry. The fuel battery generates electricity using fuel gas and oxidant gas. The voltage adjuster is connected to at least one of the fuel battery and the electric storage. The voltage adjuster is configured to adjust voltage output from the fuel battery or the electric storage to output the adjusted voltage to a load. The pump supplies the oxidant gas to the fuel battery using electric power output from at least one of the fuel battery and the electric storage. The voltage adjuster is connected between the fuel battery and the pump. The abnormity detector detects abnormity in the voltage adjuster. The circuitry is configured to restrict the electric power supplied to the pump in a case where the abnormity detector detects the abnormity in the voltage adjuster.
    Type: Grant
    Filed: January 16, 2017
    Date of Patent: May 28, 2019
    Assignee: HONDA MOTOR CO., LTD.
    Inventors: Yasutaka Sakai, Kuniaki Ojima, Masaaki Komatsu
  • Patent number: 10059225
    Abstract: A fuel cell vehicle includes a lid, a switch, a sensor, and circuitry. The lid opens and closes a fuel inlet through which fuel gas is to be supplied to a tank. The switch takes an opening position to open the lid and a closing position to close the lid. The sensor detects whether the lid opens or closes the fuel inlet. The circuitry is configured to prohibit the fuel cell vehicle from travelling when the sensor detects that the lid opens the fuel inlet while the switch takes the opening position.
    Type: Grant
    Filed: February 14, 2017
    Date of Patent: August 28, 2018
    Assignee: HONDA MOTOR CO., LTD.
    Inventors: Takuto Nakagawa, Tomoaki Nakagawa, Kenji Taruya, Kuniaki Ojima
  • Patent number: 10003094
    Abstract: A fuel cell system includes a first temperature sensor to detect a valve temperature of a sealing valve. A second temperature sensor is provided in a refrigerant circulation circuit to detect a fuel cell temperature of a fuel cell through a refrigerant. The circuitry is configured to calculate a sealing valve estimated temperature by subtracting a correction value from the fuel cell temperature detected by the second temperature sensor after the fuel cell stops generating electric power and after the sealing valve is closed. The circuitry is configured to determine whether at least one of the valve temperature and the sealing valve estimated temperature is lower than a predicted freezing temperature. The circuitry is configured to open the sealing valve when it is determined that the at least one of the valve temperature and the sealing valve estimated temperature is lower than the predicted freezing temperature.
    Type: Grant
    Filed: December 15, 2016
    Date of Patent: June 19, 2018
    Assignee: HONDA MOTOR CO., LTD.
    Inventors: Kuniaki Ojima, Takuya Tamura
  • Publication number: 20180034078
    Abstract: A method of controlling a fuel cell system includes supplying a fuel gas from a fuel-gas storage container to a fuel cell via a drive valve provided in a fuel-gas path. A first pressure is detected in the fuel-gas path between a first decompression mechanism and a second decompression mechanism. A second pressure is detected in the fuel-gas path between the second decompression mechanism and the drive valve. An on-off valve is opened. The on-off valve is provided in a bypass path. The first pressure and the second pressure are compared after the on-off valve has been opened. The fuel cell system is controlled to decrease electric power generated by the fuel cell or to stop generating electric power in the fuel cell when the first pressure is not substantially equal to the second pressure.
    Type: Application
    Filed: June 30, 2017
    Publication date: February 1, 2018
    Applicant: HONDA MOTOR CO., LTD.
    Inventors: Satoru KAWASE, Kuniaki OJIMA, Koshi KIMURA
  • Publication number: 20170352902
    Abstract: A fuel cell system includes a battery, a fuel cell, an air pump, and a processor. The battery stores electric power. The fuel cell supplies electric power to the battery. The air pump is driven with the electric power supplied from the battery to supply air to the fuel cell. The processor, when starting the fuel cell system, is configured to compare an amount of the electric power stored in the battery with a threshold electric power. If the amount of the electric power is higher than or equal to the threshold electric power, the air pump is driven. If the amount of the electric power is lower than the threshold electric power, the air pump is prohibited to drive.
    Type: Application
    Filed: May 12, 2017
    Publication date: December 7, 2017
    Applicant: HONDA MOTOR CO., LTD.
    Inventor: Kuniaki OJIMA
  • Publication number: 20170346117
    Abstract: A method of shutting down a fuel cell system includes a fuel cell includes generating power via an electrochemical reaction between a fuel gas and an oxidant gas. A shutdown command is output to the fuel cell to stop generating power. The fuel cell is controlled to continue generating power during an oxygen consumption process to consume oxygen in the oxidant gas remaining in a cathode system of the fuel cell even when the shutdown command is output to the fuel cell. At least one of voltage, current, and power output from the fuel cell is detected during the oxygen consumption process. Whether an abnormality occurs during the oxygen consumption process is determined based on at least one of the voltage, the current, and the power. The fuel cell is controlled to stop generating power during the oxygen consumption process when it is determined that abnormality occurs.
    Type: Application
    Filed: May 24, 2017
    Publication date: November 30, 2017
    Applicant: HONDA MOTOR CO., LTD.
    Inventors: Kuniaki OJIMA, Kenji TARUYA
  • Publication number: 20170250427
    Abstract: A fuel battery system includes a fuel battery, an electric storage, a voltage adjuster, a pump, an abnormity detector, and circuitry. The fuel battery generates electricity using fuel gas and oxidant gas. The voltage adjuster is connected to at least one of the fuel battery and the electric storage. The voltage adjuster is configured to adjust voltage output from the fuel battery or the electric storage to output the adjusted voltage to a load. The pump supplies the oxidant gas to the fuel battery using electric power output from at least one of the fuel battery and the electric storage. The voltage adjuster is connected between the fuel battery and the pump. The abnormity detector detects abnormity in the voltage adjuster. The circuitry is configured to restrict the electric power supplied to the pump in a case where the abnormity detector detects the abnormity in the voltage adjuster.
    Type: Application
    Filed: January 16, 2017
    Publication date: August 31, 2017
    Applicant: HONDA MOTOR CO., LTD.
    Inventors: Yasutaka SAKAI, Kuniaki OJIMA, Masaaki KOMATSU
  • Publication number: 20170246965
    Abstract: A fuel cell vehicle includes a lid, a switch, a sensor, and circuitry. The lid opens and closes a fuel inlet through which fuel gas is to be supplied to a tank. The switch takes an opening position to open the lid and a closing position to close the lid. The sensor detects whether the lid opens or closes the fuel inlet. The circuitry is configured to prohibit the fuel cell vehicle from travelling when the sensor detects that the lid opens the fuel inlet while the switch takes the opening position.
    Type: Application
    Filed: February 14, 2017
    Publication date: August 31, 2017
    Applicant: HONDA MOTOR CO., LTD.
    Inventors: Takuto NAKAGAWA, Tomoaki NAKAGAWA, Kenji TARUYA, Kuniaki OJIMA
  • Publication number: 20170237094
    Abstract: A fuel cell system includes a first temperature sensor to detect a valve temperature of a sealing valve. A second temperature sensor is provided in a refrigerant circulation circuit to detect a fuel cell temperature of a fuel cell through a refrigerant. The circuitry is configured to calculate a sealing valve estimated temperature by subtracting a correction value from the fuel cell temperature detected by the second temperature sensor after the fuel cell stops generating electric power and after the sealing valve is closed. The circuitry is configured to determine whether at least one of the valve temperature and the sealing valve estimated temperature is lower than a predicted freezing temperature. The circuitry is configured to open the sealing valve when it is determined that the at least one of the valve temperature and the sealing valve estimated temperature is lower than the predicted freezing temperature.
    Type: Application
    Filed: December 15, 2016
    Publication date: August 17, 2017
    Applicant: HONDA MOTOR CO., LTD.
    Inventors: Kuniaki OJIMA, Takuya TAMURA
  • Patent number: 8435687
    Abstract: A contactor electrically connects and disconnects a fuel cell from a load. When a failure-detecting mode for detecting a closing failure of a contactor is initiated, an opening command is transmitted to the contactor, and a DC/DC converter connected to a motor changes the load voltage. Then, the load voltage and a fuel cell voltage are compared with each other. If the contactor is in a normal open state, as a result of the opening command, the fuel cell voltage is constant, whereas the load voltage of the DC/DC converter decreases, thereby producing a voltage difference. A closing failure of the contactor is determined when it is detected that the fuel cell voltage is substantially equal to the load voltage.
    Type: Grant
    Filed: November 24, 2010
    Date of Patent: May 7, 2013
    Assignee: Honda Motor Co., Ltd.
    Inventors: Kuniaki Ojima, Minoru Sasaki
  • Patent number: 8342275
    Abstract: A fuel cell vehicle is provided that can suppress uneven torque. The fuel cell vehicle 1 includes a motor 4; a fuel cell 10; a battery 3; a battery drive unit 21 for driving the motor 4 using electricity from the battery 3 so as to serve as an battery drive mode, in which case the initialization of the fuel cell 10 to generate electricity is not complete; a fuel cell drive unit 22 for driving the motor 4 using electricity from the fuel cell 10 and battery 3 so as to serve as a fuel cell drive mode, in which case the initialization of the fuel cell 10 to generate electricity is complete; and a torque upper limit control unit 23 for controlling a torque upper limit value of the motor 4 under the battery drive mode and fuel cell drive mode.
    Type: Grant
    Filed: May 13, 2008
    Date of Patent: January 1, 2013
    Assignee: Honda Motor Co., Ltd.
    Inventors: Kuniaki Ojima, Yoshikazu Murakami, Dai Saitoh