FUEL CELL SYSTEM

摘要

A fuel cell system includes a control unit that estimates a discharge amount of the fuel gas partially discharged from the fuel cell partially discharged during an opening period of the discharge valve based on a lost amount of the fuel gas during the opening period and a consumed amount of the fuel gas by electric generation of the fuel cell during the opening period, wherein a pressure increase period during which the pressure increases and a pressure decrease period during which the pressure decreases exist due to intermittent injection of the fuel gas, and the control unit estimates the lost amount of the fuel gas based on a decrease rate of the pressure during the pressure decrease period within the opening period, and based on an assumed decrease rate of the pressure during the pressure increase period within the opening period.

主权项

1. A fuel cell system comprising:
a fuel cell; a fuel injection portion that injects a fuel gas to the fuel cell; a supply passage through which the fuel gas injected from the fuel injection portion 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 pressure detecting portion that detects pressure in the supply passage; and a control unit that estimates a discharge amount of the fuel gas partially discharged from the fuel cell partially discharged during an opening period of the discharge valve on a basis of a lost amount of the fuel gas during the opening period and a consumed amount of the fuel gas by electric generation of the fuel cell during the opening period, wherein a pressure increase period during which the pressure increases and a pressure decrease period during which the pressure decreases exist due to intermittent injection of the fuel gas from the fuel injection portion, and the control unit estimates the lost amount of the fuel gas based on a decrease rate of the pressure during the pressure decrease period within the opening period, and based on an assumed decrease rate of the pressure during the pressure increase period within the opening period, the pressure during the pressure increase period being assumed to decrease at the assumed decrease rate same as the decrease rate of the pressure during the pressure decrease period.