Fuel cell system and control method thereof
AssigneeHonda Motor Co., Ltd.
InventorsHikaru WATANABE, Yuki IWAO
Life of this patent
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Abstract
A fuel cell system makes a flow rate of a cathode gas that is increased in a voltage recovery control smaller at low-temperature startup until a fuel cell stack reaches a predetermined water-content state than the flow rate of the cathode gas that is increased at the normal startup.
Claims13
A fuel cell system including a fuel cell stack configured to generate electric power by reactions between an anode gas and a cathode gas, wherein the fuel cell system performs a low-temperature startup control in a case where a temperature of the fuel cell stack is lower than a low-temperature threshold, performs a normal startup control in a case where the temperature is equal to or higher than the low-temperature threshold, and performs a voltage recovery control of the fuel cell stack by increasing a cathode gas flow rate in response to a voltage drop of the fuel cell stack after the low-temperature startup by the low-temperature startup control or after normal startup by the normal startup control, wherein
- one or more processors that execute computer-executable instructions stored in a memory,
- wherein the one or more processors execute the computer-executable instructions to cause the fuel cell system to:
- set an increase in the cathode gas flow rate until the fuel cell stack reaches a predetermined water-content state in the voltage recovery control during the low-temperature startup to be smaller than an increase in the cathode gas flow rate in the voltage recovery control during the normal startup.
A fuel cell system including a fuel cell stack configured to generate electric power by reactions between an anode gas and a cathode gas, wherein the fuel cell system performs a low-temperature startup control in a case where a temperature of the fuel cell stack is lower than a low-temperature threshold, performs a normal startup control in a case where the temperature is equal to or higher than the low-temperature threshold, and performs a voltage recovery control of the fuel cell stack by increasing a cathode gas flow rate in response to a voltage drop of the fuel cell stack after the low-temperature startup by the low-temperature startup control or after normal startup by the normal startup control, wherein
- one or more processors that execute computer-executable instructions stored in a memory,
- wherein the one or more processors execute the computer-executable instructions to cause the fuel cell system to:
- set an increase in the cathode gas flow rate until the fuel cell stack reaches a predetermined water-content state in the voltage recovery control during the low-temperature startup to be smaller than an increase in the cathode gas flow rate after the fuel cell stack has reached the predetermined water-content state in the voltage recovery control during the low-temperature startup.
A control method of a fuel cell system executed by one or more processors, the control method comprising:
- determining a voltage drop of the fuel cell stack at low-temperature startup by low-temperature startup control performed in a case where a temperature of a fuel cell stack configured to generate electric power by reactions between an anode gas and a cathode gas is lower than a low-temperature threshold, or at normal startup by normal startup control performed in a case where the temperature is equal to or higher than the low-temperature threshold;
- and
- performing a voltage recovery control by increasing a cathode gas flow rate in response to the voltage drop of the fuel cell stack at low-temperature startup by the low-temperature startup control or at normal startup by the normal startup control, wherein
- in performing a voltage recovery control, setting an increase in the cathode gas flow rate until the fuel cell stack reaches a predetermined water-content state in the voltage recovery control during the low-temperature startup to be smaller than an increase in the cathode gas flow rate during the normal startup.
Dependencies are inferred from the claim text.