摘要:
A fuel cell system starts a fuel cell by setting the voltage supplied to a secondary cell from a voltage transformer at an open-circuit voltage of the fuel cell, and raising the voltage of the fuel cell from a starting voltage to the open-circuit voltage, in the case where the secondary cell is expected to be overcharged if the secondary cell receives electric power. In the case where the secondary cell is not expected to be overcharged if the secondary cell receives electric power, the system starts the fuel cell by setting the voltage supplied from the voltage transformer at a high-potential-avoiding voltage that is lower than the open-circuit voltage of the fuel cell at or after the elapse of a predetermined time following the output of a command to close an FC relay, and raising the voltage of the fuel cell from the starting voltage to the high-potential-avoiding voltage.
摘要:
A fuel cell system includes: a secondary cell; a voltage converter provided between the secondary cell and a load; a fuel cell; an FC relay that turns on and off electrical connection between the fuel cell and the shared electrical path; an electrical-leakage detector that detects electrical leakage in an electrical system; and a control portion that performs determination regarding electrical leakage. The control portion has: start means for starting the fuel cell by raising voltage of the fuel cell from a starting voltage to an operation voltage that is lower than an open-circuit voltage; and electrical leakage determination means for performing the determination regarding electrical leakage after a predetermined time elapses, when the FC relay is closed while a voltage difference between the voltage of the fuel cell and voltage supplied from the voltage converter to the load is greater than a predetermined threshold value.
摘要:
A fuel cell system includes a fuel cell, a secondary cell, a voltage transformer, and a control portion. The control portion charges the secondary cell with surplus electric power at the time of starting the fuel cell, and adjusts voltage of the fuel cell between an open-circuit voltage and a high-potential-avoiding voltage in the case where the secondary cell is expected to become overcharged while the output voltage of the fuel cell is decreased from the open-circuit voltage to the high-potential-avoiding voltage. The foregoing case is at least one of the case where a passage electric power that passes through the voltage transformer exceeds a secondary cell-charging-purpose permitted-to-pass electric power, the case where the input electric power restriction value for the secondary cell is exceeded, and the case where amount of regeneration by the mover that is charged is not restricted.
摘要:
A fuel cell system includes: a secondary cell; a voltage converter provided between the secondary cell and a load; a fuel cell; an FC relay that turns on and off electrical connection between the fuel cell and the shared electrical path; an electrical leakage detector that detects electrical leakage in an electrical system; and a control portion that performs determination regarding electrical leakage. The control portion has: start means for starting the fuel cell by raising voltage of the fuel cell from a starting voltage to an operation voltage that is lower than an open-circuit voltage; and electrical leakage determination means for performing the determination regarding electrical leakage after a predetermined time elapses, when the FC relay is closed while a voltage difference between the voltage of the fuel cell and voltage supplied from the voltage converter to the load is greater than a predetermined threshold value.
摘要:
A fuel cell system comprising a fuel cell that generates electricity through an electrochemical reaction between a fuel gas and an oxidant gas, and a control portion that controls amount of electricity generation at a time of starting the fuel cell, characterized in that the control portion has voltage drop control means for controlling speed of dropping a starting voltage of the fuel cell from an open-circuit voltage to a high-potential-avoiding voltage according to an initial voltage of the fuel cell and to a pre-determined threshold voltage that is lower than the high-potential-avoiding voltage, when the starting voltage of the fuel cell is dropped from the open-circuit voltage to the high-potential-avoiding voltage.
摘要:
A fuel cell system includes a fuel cell, a secondary cell, a voltage transformer, and a control portion. The control portion charges the secondary cell with surplus electric power at the time of starting the fuel cell, and adjusts voltage of the fuel cell between an open-circuit voltage and a high-potential-avoiding voltage in the case where the secondary cell is expected to become overcharged while the output voltage of the fuel cell is decreased from the open-circuit voltage to the high-potential-avoiding voltage. The foregoing case is at least one of the case where a passage electric power that passes through the voltage transformer exceeds a secondary cell-charging-purpose permitted-to-pass electric power, the case where the input electric power restriction value for the secondary cell is exceeded, and the case where amount of regeneration by the mover that is charged is not restricted.
摘要:
A fuel cell system includes a fuel cell that has a plurality of fuel unit cells, and a control portion that controls voltage of the fuel cell. The control portion has: start means for starting the fuel cell by raising the voltage of the fuel cell from a starting voltage to a high-potential-avoiding voltage that is lower than an open-circuit voltage; and command means for further raising the voltage of the fuel cell beyond the high-potential-avoiding voltage if cell voltage of at least one of the plurality of fuel unit cells is lower than or equal to a certain voltage after a certain time elapses after the voltage of the fuel cell is raised to the high-potential-avoiding voltage.
摘要:
A fuel cell system comprising a fuel cell that generates electricity through an electrochemical reaction between a fuel gas and an oxidant gas, and a control portion that controls amount of electricity generation at a time of starting the fuel cell, characterized in that the control portion has voltage drop control means for controlling speed of dropping a starting voltage of the fuel cell from an open-circuit voltage to a high-potential-avoiding voltage according to an initial voltage of the fuel cell and to a pre-determined threshold voltage that is lower than the high-potential-avoiding voltage, when the starting voltage of the fuel cell is dropped from the open-circuit voltage to the high-potential-avoiding voltage.
摘要:
During an intermittent operation of the fuel cell, a demanded FC voltage calculation portion calculates a predetermined voltage that is below a heightened potential avoidance threshold voltage as a demanded FC voltage, and outputs the voltage to a converter. When during the intermittent operation of the fuel cell, a deviation obtained by subtracting a generated power of the fuel cell from a system's allowable power that is allowable in the fuel cell system becomes less than or equal to a value 0, the demanded FC voltage correction portion corrects a command value provided for the converter so that the deviation becomes equal to the value 0.
摘要:
There is disclosed a fuel cell system having a motor which can be driven and generate a regenerative power by receiving the supply of a power, wherein an influence on power supply control is decreased. The fuel cell system fuel cell system comprises a fuel cell which generates a power by an electrochemical reaction of a fuel gas and an oxidant gas; a motor which can be driven and generate the regenerative power by receiving the supply of a power; an inverter which converts a direct-current power output from the fuel cell into an alternate-current power to supply the power to the motor, thereby controlling the driving of the motor; a battery which is connected to the motor in parallel with the fuel cell, and which can be charged with the power generated by the fuel cell and the regenerative power generated by the motor and which can discharge the charged powers to the motor; a rotation number detector which detects the rotation number of the motor; and a control unit which determines whether or not to allow the stop of the control by the inverter with respect to the motor based on the present rotation number of the motor. The control unit compares the present rotation number of the motor with a threshold value which varies in accordance with operation modes of the fuel cell, to perform the determination.