Fuel cell system
AssigneeDenso Corporation
InventorTakashi YAMADA
Life of this patent
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Abstract
A fuel cell system includes a fuel cell stack including a plurality of single cells stacked, a dry-wet detection unit that detects a dry-wet state of the fuel cell stack, and an operation control unit that controls operation of the fuel cell stack. When an operating condition under which the fuel cell stack is at a high temperature and at a high load is established, the dry-wet detection unit determines whether the fuel cell stack is in a deviation state of deviating from an ideal dry-wet state based on a physical quantity having a higher correlation with drying and wetting of the fuel cell stack than the temperature of the fuel cell stack. When the deviation state is detected, the operation control unit performs a reset operation for recovering the dry-wet state.
Claims14
A fuel cell system comprising:
- a fuel cell stack including a plurality of single cells being stacked;
- a dry-wet detection unit configured to detect a dry-wet state of the fuel cell stack;
- and
- an operation control unit configured to control an operation of the fuel cell stack, wherein
- the dry-wet detection unit is configured to, when an operating condition in which the fuel cell stack is at a high temperature and at a high load is established, determine whether the fuel cell stack is in a deviation state, which deviates from an ideal dry-wet state, based on a physical quantity, wherein the physical quantity has a higher correlation with drying and wetting of the fuel cell stack than a temperature of the fuel cell stack, and
- the operation control unit is configured to
- perform, on detection of the deviation state, a reset operation to recover the dry-wet state,
- subsequently, continue the reset operation, until a recovery condition, which is for determining whether the dry-wet state of the fuel cell stack is recovered, is established, wherein
- the operating condition is established when a current, which flows through the fuel cell stack, is equal to or higher than a reference current and when a temperature of the fuel cell stack is equal to or higher than a reference temperature, and
- the dry-wet detection unit is configured to
- store, in a memory, the physical quantity when the operating condition is established and
- determine whether the recovery condition is established based on a change amount of the physical quantity with respect to the physical quantity stored in the memory.
A fuel cell system comprising:
- a fuel cell stack including a plurality of single cells being stacked;
- and
- a processor configured to
- detect a dry-wet state of the fuel cell stack,
- control an operation of the fuel cell stack,
- determine, when an operating condition in which the fuel cell stack is at a high temperature and at a high load is established, whether the fuel cell stack is in a deviation state, which deviates from an ideal dry-wet state, based on a physical quantity,
- wherein the physical quantity has a higher correlation with drying and wetting of the fuel cell stack than a temperature of the fuel cell stack,
- wherein the operating condition is established when a current, which flows through the fuel cell stack, is equal to or higher than a reference current and when a temperature of the fuel cell stack is equal to or higher than a reference temperature,
- perform, on detection of the deviation state, a reset operation to recover the dry-wet state,
- subsequently, continue the reset operation, until a recovery condition, which is for determining whether the dry-wet state of the fuel cell stack is recovered, is established,
- store, in a memory, the physical quantity when the operating condition is established, and
- determine whether the recovery condition is established based on a change amount of the physical quantity with respect to the physical quantity stored in the memory.
Dependencies are inferred from the claim text.