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    FUEL CELL SYSTEM AND CONTROL METHOD OF FUEL CELL SYSTEM
    1.
    发明申请
    FUEL CELL SYSTEM AND CONTROL METHOD OF FUEL CELL SYSTEM 审中-公开

    公开(公告)号：US20200274176A1

    公开(公告)日：2020-08-27

    申请号：US16790561

    申请日：2020-02-13

    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA

    Inventor： Satoshi SHIOKAWA ,  Shinji ASO

    IPC: H01M8/04828 ,  H01M8/04746 ,  H01M8/04858 ,  H01M8/04225 ,  H01M8/04089 ,  H01M8/0438 ,  H01M8/0444

    Abstract: When electric power requested from a load exceeds a predetermined reference value, an operating state of the fuel cell system is controlled so as to enable a normal operation mode where the fuel cell generates electric power corresponding to the requested electric power. When the requested electric power is the reference value or less, the operating state is controlled to enable an intermittent operation mode. A refresh process for sweeping current from the fuel cell and lowering the voltage of the fuel cell to a reduction voltage is executed during a shift from the intermittent operation mode to the normal operation mode. The current swept from the fuel cell at the start of the refresh process is reduced more as an oxygen amount in the fuel cell at the end of the intermittent operation mode is smaller.

    FUEL CELL SYSTEM AND METHOD FOR CONTROLLING THE SAME
    6.
    发明申请
    FUEL CELL SYSTEM AND METHOD FOR CONTROLLING THE SAME 有权

    公开(公告)号：US20210066736A1

    公开(公告)日：2021-03-04

    申请号：US16896555

    申请日：2020-06-09

    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA

    Inventor： Satoshi SHIOKAWA ,  Shinji ASO

    IPC: H01M8/04858 ,  H01M8/04537 ,  H01M8/0662

    Abstract: A fuel cell system includes a controller configured to execute refreshing control for removing an oxide film on a catalyst during an operation of a fuel cell, and an impedance measurer configured to measure an impedance of the fuel cell during the operation of the fuel cell. The impedance measurer executes a calculation process for calculating the impedance by using measurement values of a current and a voltage of the fuel cell in a predetermined measurement time, and outputs a substitute value prepared in advance as the impedance when the start of the refreshing control during the measurement time is detected.

    FUEL CELL SYSTEM
    7.
    发明申请
    FUEL CELL SYSTEM 审中-公开

    公开(公告)号：US20180304766A1

    公开(公告)日：2018-10-25

    申请号：US15955851

    申请日：2018-04-18

    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA

    Inventor： Yuji KAKENO ,  Shinji ASO

    IPC: B60L11/18 ,  B60L15/20 ,  H02P6/08

    CPC classification number: B60L11/1887 ,  B60L11/1814 ,  B60L11/1864 ,  B60L15/20 ,  B60L2210/10 ,  H02P6/08 ,  H02P2201/07

    Abstract: A fuel cell system to be mounted on a vehicle includes: a fuel cell for generating electric power by using reactant gas; a secondary battery capable of charging and discharging electric power; a converter electrically connected between a drive motor for driving the vehicle and the secondary battery to perform voltage conversion between the drive motor and the secondary battery; and a controller for controlling the fuel cell system. The controller exerts such control that when an accelerator for accepting a speed control instruction for the vehicle has accepted a deceleration instruction under a condition that a charge rate of the secondary battery is equal to or more than a preset value, or when the accelerator has accepted a deceleration instruction under a condition that a chargeable electric power of the secondary battery is equal to or less than a preset value, electric power is discharged from the secondary battery during a period of power-running operation lasting until the drive motor with its torque being decreased shifts to regenerative operation. Thus, increases in frequency at which the auxiliary machine is operated to consume regenerative power can be suppressed.

    FUEL CELL SYSTEM
    9.
    发明申请
    FUEL CELL SYSTEM 审中-公开

    公开(公告)号：US20180114999A1

    公开(公告)日：2018-04-26

    申请号：US15724645

    申请日：2017-10-04

    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA

    Inventor： Takahiro UMEHARA ,  Shinji ASO

    IPC: H01M8/04537 ,  G05F1/573

    CPC classification number: H01M8/04559 ,  G05F1/573 ,  H01M8/04597 ,  H01M8/04955

    Abstract: A fuel cell system includes: a fuel cell stack; a voltage sensor configured to detect voltage of the fuel cell stack; a fuel cell relay connected to the fuel cell stack; a switch connected between the fuel cell stack and the fuel cell relay; an overcurrent detector configured to detect an overcurrent flowing to the switch; and a power generation stop device configured to stop power generation of the fuel cell stack when the overcurrent detector detects the overcurrent and the detected voltage becomes a specified value or less.

    FUEL CELL SYSTEM
    10.
    发明申请
    FUEL CELL SYSTEM 审中-公开

    公开(公告)号：US20180019489A1

    公开(公告)日：2018-01-18

    申请号：US15638532

    申请日：2017-06-30

    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA

    Inventor： Yuji KAKENO ,  Yutaka TANO ,  Shinji ASO

    IPC: H01M8/04858 ,  H01M8/04089 ,  H01M8/04537 ,  H02J1/00 ,  H02M1/00

    CPC classification number: H01M8/04865 ,  H01M8/04089 ,  H01M8/04544 ,  H01M8/04559 ,  H01M16/006 ,  H01M2250/20 ,  H02J2001/004 ,  H02M7/44 ,  H02M2001/007 ,  H02M2001/0087 ,  Y02T90/32

    Abstract: There is provided a fuel cell system. This fuel cell system comprises a fuel cell configured to generate electric power using reactive gases; a voltage sensor configured to measure a voltage output from the fuel cell; a converter configured to boost an input voltage that is input from the fuel cell; and a controller configured to control the converter. In the case where the voltage output from the fuel cell to the converter is to be boosted after a changeover of an operating state of the fuel cell system from an intermittent operation to an ordinary operation, when a duty ratio D1 calculated by Mathematical Formula I is greater than a duty ratio D2 calculated by Mathematical Formula II, the controller causes the converter to boost the voltage output from the fuel cell at the duty ratio D2. [ Math .  1 ]  D   1 = 1 - Vltrg VH ( I ) where VH (V) denotes a value of output voltage that is output from the converter, and Vltrg (V) denotes an estimated value of voltage that is output from the fuel cell, [ Math .  2 ]  D   2 = 1 - ( Vl + Vlmrg ) Vhul ( II ) where Vl (V) denotes a measured value of voltage of the fuel cell by the voltage sensor, Vlmrg (V) denotes a correction amount of the measured value Vl, and Vhul (V) denotes a predetermined upper limit value of the output voltage. This configuration prevents the converter from excessively boosting the actual voltage input from the fuel cell and outputting the excessively boosted voltage.

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