Hydrogen supply system for fuel cell and control method thereof

A hydrogen supply system for a fuel cell, the system comprising:

• the fuel cell;
• a hydrogen supply line connected to an inlet side of an anode of the fuel cell to supply hydrogen to the fuel cell;
• a hydrogen supply pressure sensor configured for measuring pressure of the hydrogen supply line;
• a controller electrically connected to the hydrogen supply pressure sensor and configured for deriving a correction value of the hydrogen supply pressure sensor, supplying the hydrogen after air supply is cut off during an operation of the fuel cell, measuring a pressure variation of the hydrogen supply line, and selectively applying the correction value of the hydrogen supply pressure sensor based on a magnitude of the measured pressure variation,
• a discharge line connected to an outlet side of the anode of the fuel cell to communicate with an outside thereof;
• and
• a discharge valve provided on the discharge line to control communication between the outlet side of the anode of the fuel cell and the outside,
• wherein the controller is configured to supply the hydrogen to a target pressure value after the operation of the fuel cell is terminated, and to open the discharge valve for a reference time period when the hydrogen supply is completed,
• wherein the controller is configured to derive a pressure value of the hydrogen supply line detected by the hydrogen supply pressure sensor after the discharge valve is opened for the reference time period, and to determine a difference between the derived pressure value of the hydrogen supply line and the target pressure value, as a pressure error,
• wherein the controller is configured to reflect a correction factor in the pressure variation stored in a memory, and to compare the pressure variation in which the correction factor is reflected with a magnitude of the pressure error, thus determining whether to use the correction value of the hydrogen supply pressure sensor, and
• wherein the controller is configured to utilize the correction value of the hydrogen supply pressure sensor, when the determined pressure error is greater than a pressure variation value in which the correction factor is reflected.

A hydrogen supply system for a fuel cell, the system comprising:

• the fuel cell;
• a hydrogen supply line connected to an inlet side of an anode of the fuel cell to supply hydrogen to the fuel cell;
• a hydrogen supply pressure sensor configured for measuring pressure of the hydrogen supply line;
• a controller electrically connected to the hydrogen supply pressure sensor and configured for deriving a correction value of the hydrogen supply pressure sensor, supplying the hydrogen after air supply is cut off during an operation of the fuel cell, measuring a pressure variation of the hydrogen supply line, and selectively applying the correction value of the hydrogen supply pressure sensor based on a magnitude of the measured pressure variation;
• a discharge line connected to an outlet side of the anode of the fuel cell to communicate with an outside thereof;
• and
• a discharge valve provided on the discharge line to control communication between the outlet side of the anode of the fuel cell and the outside,
• wherein the controller is configured to supply the hydrogen to a target pressure value after the operation of the fuel cell is terminated, and to open the discharge valve for a reference time period when the hydrogen supply is completed,
• wherein the controller is configured to derive a pressure value of the hydrogen supply line detected by the hydrogen supply pressure sensor after the discharge valve is opened for the reference time period, and to determine a difference between the derived pressure value of the hydrogen supply line and the target pressure value, as a pressure error,
• wherein the controller is configured to reflect a correction factor in the pressure variation stored in a memory, and to compare the pressure variation in which the correction factor is reflected with a magnitude of the pressure error, thus determining whether to use the correction value of the hydrogen supply pressure sensor, and
• wherein the controller is configured to not use the correction value of the hydrogen supply pressure sensor, and to eliminate the correction value of the hydrogen supply pressure sensor to derive the correction value of the hydrogen supply pressure sensor again, when the determined pressure error is smaller than a pressure variation value in which the correction factor is reflected.