Patents by Inventor Mitsunori Kumada

Mitsunori Kumada 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: 10239405
    Abstract: A fuel cell equipped vehicle system in which an external power supply is coupled to an electric power supply line, the electric power supply line being coupled to a fuel cell, an electric power being input/output to/from a vehicular battery through the electric power supply line, the fuel cell equipped vehicle system performing an insulation test of the electric power supply line before charging the vehicular battery, the fuel cell equipped vehicle system including an insulation test unit configured to perform the insulation test of the electric power supply line; a switch that couples and cuts off between the fuel cell and the electric power supply line; and a control unit configured to control a coupling and a cutoff to/from the electric power supply line of the vehicular battery and control the switch, wherein the control unit is configured to cut off the vehicular battery from the electric power supply line and control the switch to cut off the fuel cell from the electric power supply line, and then drive
    Type: Grant
    Filed: November 10, 2016
    Date of Patent: March 26, 2019
    Assignee: NISSAN MOTOR CO., LTD.
    Inventors: Kenta Suzuki, Mitsunori Kumada
  • Patent number: 10232853
    Abstract: A control device for a vehicle includes a fuel cell, a motor-generator, a power unit, a transmission, a motor-generator control unit configured to perform a power control on the motor-generator based on a driver request torque, and a generated power control unit configured to control the generated power of the fuel cell based on a load of the fuel cell including the motor-generator. The motor-generator control unit performs a shifting power control for decreasing a rotation speed of the motor-generator during an upshift of the transmission, and a power control on the motor-generator based on a limit torque of the motor-generator during the shifting power control. The limit torque of the motor-generator being calculated based on an actual generated power of the fuel cell per unit time and an acceptable power of the power unit per unit time.
    Type: Grant
    Filed: September 9, 2014
    Date of Patent: March 19, 2019
    Assignee: NISSAN MOTOR CO., LTD.
    Inventors: Mitsunori Kumada, Ryohey Toyota
  • Publication number: 20180375135
    Abstract: A fuel cell system supplies a fuel and an oxidant and outputs a generated power from the fuel cell to a secondary battery. In a method for controlling the fuel cell system, a charged amount of the secondary battery is acquired, when the charged amount of the secondary battery becomes equal to or less than a prescribed value, the fuel cell is started up from a state that the fuel cell stops power generation, or the generated power of the fuel cell is increased. In the method for controlling, a remaining amount of the fuel which can be supplied to the fuel cell is acquired and when the remaining amount of the fuel becomes small, the prescribed value is set to a smaller value as compared with when the remaining amount of the fuel is large.
    Type: Application
    Filed: November 30, 2016
    Publication date: December 27, 2018
    Applicant: NISSAN MOTOR CO., LTD.
    Inventors: Mitsunori KUMADA, Tatsuya YAGUCHI, Kenta SUZUKI
  • Publication number: 20180370366
    Abstract: A fuel cell equipped vehicle system in which an external power supply is coupled to an electric power supply line, the electric power supply line being coupled to a fuel cell, an electric power being input/output to/from a vehicular battery through the electric power supply line, the fuel cell equipped vehicle system performing an insulation test of the electric power supply line before charging the vehicular battery, the fuel cell equipped vehicle system including an insulation test unit configured to perform the insulation test of the electric power supply line; a switch that couples and cuts off between the fuel cell and the electric power supply line; and a control unit configured to control a coupling and a cutoff to/from the electric power supply line of the vehicular battery and control the switch, wherein the control unit is configured to cut off the vehicular battery from the electric power supply line and control the switch to cut off the fuel cell from the electric power supply line, and then drive
    Type: Application
    Filed: November 10, 2016
    Publication date: December 27, 2018
    Applicant: NISSAN MOTOR CO., LTD.
    Inventors: Kenta SUZUKI, Mitsunori KUMADA
  • Publication number: 20180294492
    Abstract: A fuel cell vehicle control method executed in a fuel cell vehicle having a fuel cell, an air supply device that supplies air to the fuel cell, a drive motor that drives a fuel cell vehicle using power from the fuel cell, and a transmission provided in a power transmission path between the drive motor and drive wheels, the method changing an output current depending on a required generated power of the fuel cell and adjusting an air supply flow rate of the air supply device depending on the change of the output current, the method comprising: reducing the output current in response to a decrease of the required generated power of the fuel cell when a gearshift operation of the transmission is under an inertia phase of an upshift operation; and controlling the air supply flow rate to an inertia phase supply flow rate higher than the air supply flow rate set in response to the decrease of the output current.
    Type: Application
    Filed: October 5, 2015
    Publication date: October 11, 2018
    Applicant: NISSAN MOTOR CO., LTD.
    Inventors: Hideaki SETOGUCHI, MItsunori KUMADA
  • Patent number: 9786931
    Abstract: A fuel cell system 100 includes: a fuel cell 1 for generating a power by causing an electrochemical reaction between an oxidant gas supplied to an oxidant electrode 34 and a fuel gas supplied to a fuel electrode 67; a fuel gas supplier HS for supplying the fuel gas to the fuel electrode 67; and a controller 40 for controlling the fuel gas supplier HS to thereby supply the fuel gas to the fuel electrode 67, the controller 40 being configured to implement a pressure change when an outlet of the fuel electrode 67 side is closed, wherein based on a first pressure change pattern for implementing the pressure change at a first pressure width ?P1, the controller 40 periodically changes a pressure of the fuel gas at the fuel electrode 67.
    Type: Grant
    Filed: November 16, 2009
    Date of Patent: October 10, 2017
    Assignee: NISSAN MOTOR CO., LTD.
    Inventors: Yasushi Ichikawa, Keigo Ikezoe, Kenichi Goto, Ken Nakayama, Mitsunori Kumada, Yousuke Tomita
  • Publication number: 20170274902
    Abstract: A control device for a vehicle includes a fuel cell, a motor-generator, a power unit, a transmission, a motor-generator control unit configured to perform a power control on the motor-generator based on a driver request torque, and a generated power control unit configured to control the generated power of the fuel cell based on a load of the fuel cell including the motor-generator. The motor-generator control unit performs a shifting power control for decreasing a rotation speed of the motor-generator during an upshift of the transmission, and a power control on the motor-generator based on a limit torque of the motor-generator during the shifting power control. The limit torque of the motor-generator being calculated based on an actual generated power of the fuel cell per unit time and an acceptable power of the power unit per unit time.
    Type: Application
    Filed: September 9, 2014
    Publication date: September 28, 2017
    Applicant: NISSAN MOTOR CO., LTD.
    Inventors: Mitsunori KUMADA, Ryohey TOYOTA
  • Publication number: 20170222238
    Abstract: A fuel cell system includes a battery, a fuel cell configured to generate power in accordance with a load, an inverter configured to convert power output from the fuel cell into alternating-current power and supply the alternating-current power to a motor, and a converter configured to control voltage between the inverter and the fuel cell using power output from the battery. The fuel cell system includes a voltage control unit configured to control the converter such that the voltage between the inverter and the fuel cell does not fall below a voltage lower limit of the inverter, and a lower limit voltage control unit configured to, when power required by the motor increases, cause the voltage between the inverter and the fuel cell to fall below the voltage lower limit of the inverter.
    Type: Application
    Filed: August 8, 2014
    Publication date: August 3, 2017
    Applicant: NISSAN MOTOR CO., LTD.
    Inventors: Mitsunori KUMADA, Hidetaka NISHIMURA, Hiroshi TAKEDA
  • Patent number: 9640812
    Abstract: The fuel cell system of the present invention comprises: an electric motor, a fuel cell stack, a fuel supply unit, and a controller that controls a power-plant including the fuel cell stack and the fuel supply unit. The controller comprises further: a stack output-response request computing unit to compute a stack output-response request requested for the fuel cell stack; a stack voltage setup unit during idle-stop to set up a lower limit of stack setup-voltage during idle-stop that is set up as a stack voltage during execution of idle-stop so as to be higher as the stack output-response request is larger, and so as to be lower as the request is smaller; and an operation unit of recovering a stack voltage during idle-stop to execute a recovery operation when an actual stack voltage becomes, during execution of idle-stop, lower than the lower limit of stack setup-voltage during idle-stop.
    Type: Grant
    Filed: April 5, 2012
    Date of Patent: May 2, 2017
    Assignee: NISSAN MOTOR CO., LTD.
    Inventors: Mitsunori Kumada, Shinichi Makino, Yoshitomo Asai
  • Patent number: 9601790
    Abstract: In a fuel cell system which executes a stop process of stopping an output from a fuel cell when a required power generation amount for the fuel cell is smaller than a predetermined power generation amount and supplies oxidant during a stop process period, fuel gas is intermittently supplied to a fuel electrode at a basic supply interval, which is set in advance and at which carbon dioxide is not generated in an oxidant electrode, during the stop process period.
    Type: Grant
    Filed: April 3, 2012
    Date of Patent: March 21, 2017
    Assignee: NISSAN MOTOR CO., LTD.
    Inventors: Shinichi Makino, Yasushi Ichikawa, Michihiko Matsumoto, Mitsunori Kumada, Yoshitomo Asai
  • Patent number: 9543603
    Abstract: In a fuel cell system that includes a fuel cell that generates power in response to an electrochemical reaction between hydrogen and oxygen contained in air, and a compressor that supplies air to the fuel cell, in which an idle stop is executed to stop power generation by the fuel cell when a required load falls to or below a predetermined value, and during the idle stop, air is supplied in accordance with a voltage condition between a cathode and a anode of the fuel cell, regardless of the required load, air is supplied during the idle stop while detecting an air supply amount, and when the air supply amount reaches a predetermined value, the air supply is stopped.
    Type: Grant
    Filed: November 1, 2012
    Date of Patent: January 10, 2017
    Assignee: NISSAN MOTOR CO., LTD.
    Inventors: Masashi Sato, Mitsunori Kumada, Shinichi Makino
  • Patent number: 9401519
    Abstract: A fuel cell system includes, an oxidant feeder configured to supply an oxidant to a fuel cell, an oxidant passage which communicates with the fuel cell, a bypass passage which branches from the oxidant passage and along which part of the oxidant flows so as to bypass the fuel cell, a bypass valve which is provided in the bypass passage, an oxidant quantity-of-flow control unit which is configured to supply the quantity of flow of the oxidant corresponding to an amount of electricity required by the fuel cell, and an oxidant quantity-of-flow control unit for a sound vibration mode configured to supply a constant quantity of flow of the oxidant, and further includes a bypass valve control unit configured to control the bypass valve according to a requirement of the fuel cell when the oxidant quantity-of-flow control unit for the sound vibration mode controls the oxidant feeder.
    Type: Grant
    Filed: September 19, 2012
    Date of Patent: July 26, 2016
    Assignee: NISSAN MOTOR CO., LTD.
    Inventors: Mitsunori Kumada, Yoshitomo Asai
  • Publication number: 20150288008
    Abstract: A fuel cell system 100 includes: a fuel cell 1 for generating a power by causing an electrochemical reaction between an oxidant gas supplied to an oxidant electrode 34 and a fuel gas supplied to a fuel electrode 67; a fuel gas supplier HS for supplying the fuel gas to the fuel electrode 67; and a controller 40 for controlling the fuel gas supplier HS to thereby supply the fuel gas to the fuel electrode 67, the controller 40 being configured to implement a pressure change when an outlet of the fuel electrode 67 side is closed, wherein based on a first pressure change pattern for implementing the pressure change at a first pressure width ?P1, the controller 40 periodically changes a pressure of the fuel gas at the fuel electrode 67.
    Type: Application
    Filed: June 17, 2015
    Publication date: October 8, 2015
    Applicant: NISSAN MOTOR CO , LTD.
    Inventors: Yasushi ICHIKAWA, Keigo IKEZOE, Kenichi GOTO, Ken NAKAYAMA, Mitsunori KUMADA, Yousuke TOMITA
  • Patent number: 9083018
    Abstract: A fuel cell system includes a fuel cell, a control valve and a controller. The controller controls the control valve to periodically increase and decrease the anode gas pressure downstream of the control valve. The controller executes a shutdown/restart operation of the fuel cell by closing the control valve to stop the anode gas and shutting down power generation of the fuel cell upon receiving a shutdown command, and restarting feeding of the anode gas and restarting the power generation upon a prescribed operation restart condition being met. The controller estimates an anode gas concentration at a location where the anode gas concentration is locally lower within a power generation region of the fuel cell based on a control state of the anode gas when the shutdown command is issued. The controller sets the prescribed operation restart condition for executing the shutdown/restart operation based on the anode gas concentration.
    Type: Grant
    Filed: February 27, 2013
    Date of Patent: July 14, 2015
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Shinichi Makino, Yasushi Ichikawa, Mitsunori Kumada, Takahiro Fujii, Ryouichi Shimoi, Shinichi Miyazaki, Daigo Iwasaki
  • Patent number: 9059438
    Abstract: A fuel cell system includes a fuel cell, a control valve and a controller. The controller controls the control valve to periodically increase and decrease the anode gas pressure downstream of the control valve. The controller executes a shutdown operation of the fuel cell by closing the control valve to stop the anode gas and shutting down power generation of the fuel cell upon receiving a shutdown command. The controller estimates an anode gas concentration at a location where the anode gas concentration is locally lower within a power generation region of the fuel cell based on a control state of the anode gas at a time the shutdown command is issued. The controller determines whether to permit or prohibit shutting down the power generating operation based on the anode gas concentration.
    Type: Grant
    Filed: February 27, 2013
    Date of Patent: June 16, 2015
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Shinichi Makino, Yasushi Ichikawa, Mitsunori Kumada, Takahiro Fujii, Ryouichi Shimoi, Shinichi Miyazaki, Daigo Iwasaki
  • Patent number: 8962204
    Abstract: A fuel cell stack includes a heat exchange unit that performs heat exchange between a gas mixture containing source hydrogen and a circulating gas and cooling water used for controlling the temperature of the fuel cell stack. A system controller adjusts the temperature of the cooling water by controlling a temperature control unit on the basis of the temperature of source hydrogen flowing into a junction at which the source hydrogen and a circulating gas are mixed such that the temperature of a source/recirculated hydrogen mixture that is mixed at the junction and that is supplied to the fuel cell stack is kept within a managed temperature range.
    Type: Grant
    Filed: September 12, 2008
    Date of Patent: February 24, 2015
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Kenji Yonekura, Masatoshi Iio, Hisashi Niioka, Takatada Usami, Hayato Chikugo, Mitsunori Kumada, Naoto Todoroki, Ikuhiro Taniguchi, Yoshinao Ootake, Hitoshi Igarashi
  • Patent number: 8951687
    Abstract: For implementing a stop control which extracts a current from a fuel cell and consumes a cathode side oxygen at a system stop, the current extraction from the fuel cell is ended in a state that a certain quantity of oxygen smaller than when the current extraction is started remains on a cathode side of the fuel cell. With this, the hydrogen movement to the cathode side after the system stop can be effectively suppressed and thereby a cathode internal hydrogen concentration at the system start can be kept low, thus making it possible to properly process the cathode side hydrogen at the system start.
    Type: Grant
    Filed: June 4, 2009
    Date of Patent: February 10, 2015
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Ryoichi Shimoi, Hayato Chikugo, Mitsunori Kumada, Takashi Aoyama
  • Publication number: 20150004508
    Abstract: In a fuel cell system that includes a fuel cell that generates power in response to an electrochemical reaction between hydrogen and oxygen contained in air, and a compressor that supplies air to the fuel cell, in which an idle stop is executed to stop power generation by the fuel cell when a required load falls to or below a predetermined value, and during the idle stop, air is supplied in accordance with a voltage condition between a cathode and a anode of the fuel cell, regardless of the required load, air is supplied during the idle stop while detecting an air supply amount, and when the air supply amount reaches a predetermined value, the air supply is stopped.
    Type: Application
    Filed: November 1, 2012
    Publication date: January 1, 2015
    Inventors: Masashi Sato, Mitsunori Kumada, Shinichi Makino
  • Publication number: 20140248551
    Abstract: A fuel cell system includes, an oxidant feeder configured to supply an oxidant to a fuel cell, an oxidant passage which communicates with the fuel cell, a bypass passage which branches from the oxidant passage and along which part of the oxidant flows so as to bypass the fuel cell, a bypass valve which is provided in the bypass passage, an oxidant quantity-of-flow control unit which is configured to supply the quantity of flow of the oxidant corresponding to an amount of electricity required by the fuel cell, and an oxidant quantity-of-flow control unit for a sound vibration mode configured to supply a constant quantity of flow of the oxidant, and further includes a bypass valve control unit configured to control the bypass valve according to a requirement of the fuel cell when the oxidant quantity-of-flow control unit for the sound vibration mode controls the oxidant feeder.
    Type: Application
    Filed: September 19, 2012
    Publication date: September 4, 2014
    Inventors: Mitsunori Kumada, Yoshitomo Asai
  • Patent number: 8765315
    Abstract: Deterioration at the start-up and deterioration during the leaving period are suppressed in a good balance. As a system shutdown process, a controller (30) causes consumption of the air (oxygen) present in an oxidant electrode of a fuel cell stack (1) (oxygen consumption control). Further, after the termination of the oxygen consumption control, the controller (30) performs control to set a medium pressure hydrogen valve (13) and a hydrogen pressure adjustment valve (14) in a closed state. The controller (30) thereby causes hydrogen to be held in a passage located between the medium pressure hydrogen valve (13) and the hydrogen pressure adjustment valve (14). During a system shutdown period, a predetermined amount of hydrogen (medium pressure hydrogen) held in the hydrogen supply passage (L1) at a position between the medium pressure hydrogen valve (13) and the hydrogen pressure adjustment valve (14) can be supplied to the fuel electrode of the fuel cell stack (1) through a bypass passage (L2).
    Type: Grant
    Filed: June 15, 2009
    Date of Patent: July 1, 2014
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Mitsunori Kumada, Ryoichi Shimoi, Hayato Chikugo, Takashi Aoyama