Fuel gas supply device of fuel cell system

A fuel gas supply device for supplying fuel gas to a fuel cell stack which generates power using the fuel gas and oxidant gas, comprising:

• a fuel tank storing the fuel gas;
• a fuel gas path connecting the fuel tank and the fuel cell stack:
• a control valve provided in the fuel gas path for controlling a supply amount of the fuel gas;
• an upstream-side pressure sensor for detecting an upstream-side pressure of the fuel gas at an upstream side of the control valve;
• a downstream-side pressure sensor for detecting a downstream-side pressure of the fuel gas at a downstream side of the control valve;
• and
• a programmable controller programmed to:
• calculate a required opening of the control valve based on a target fuel gas pressure in the fuel cell stack and the detected downstream-side pressure and calculate an opening time and a closing time of the control valve based on the required opening and the detected upstream-side pressure;
• or
• calculate an opening time and a closing time of the control valve based on the target fuel gas pressure in the fuel cell stack and the detected downstream-side pressure and calculate a required opening of the control valve based on the opening time and the detected upstream-side pressure;
• and
• control the control valve using the calculated required opening, opening time and closing time.