| 摘要 |
When a current value is not greater than a reference value, a control unit estimates a discharge amount of a fuel gas based on a lost amount of the fuel gas and a consumed amount by electrical generation of the fuel gas, the lost amount being calculated based on a decrease rate of pressure in a supply passage during an opening period of a discharge valve, the consumed amount by electrical generation being calculated based on the current value during the opening period, and when the current value is greater than the reference value, the control unit estimates the discharge amount based on the differential pressure during the opening period. |
| 主权项 |
1. A fuel cell system comprising:
a fuel cell; a fuel supply source that supplies a fuel gas to the fuel cell; a supply passage through which the fuel gas supplied from the fuel supply source flows to the fuel cell; a circulation passage through which the fuel gas partially discharged from the fuel cell flows to the supply passage; a gas-liquid separator that is arranged in the circulation passage and that stores and separates water from the fuel gas partially discharged from the fuel cell; a discharge passage that is connected to the gas-liquid separator, discharges stored water in the gas-liquid separator to an outside, and partially discharges the fuel gas partially discharged from the fuel cell to the outside; a discharge valve that is arranged in the discharge passage; a current detecting portion that detects a current value of the fuel cell; a pressure detecting portion that detects pressure in the supply passage; a differential pressure detecting portion that detects a difference in pressure between a downstream side of the discharge valve and one of the supply passage, the circulation passage, the gas-liquid separator, and an upstream side of the discharge valve in the discharge passage; and a control unit that estimates a discharge amount of the fuel gas partially discharged from the fuel cell partially discharged by opening the discharge valve, wherein when the current value is not greater than a reference value, the control unit estimates the discharge amount based on a lost amount of the fuel gas and a consumed amount by electrical generation of the fuel gas, the lost amount being calculated based on a decrease rate of pressure in the supply passage during an opening period of the discharge valve, the consumed amount by electrical generation being calculated based on the current value during the opening period, and when the current value is greater than the reference value, the control unit estimates the discharge amount based on the differential pressure during the opening period. |
