Restarting system, controller and restarting method for fuel cell vehicle

A restarting method of a restarting system for a fuel cell vehicle, comprising:

• when a shutdown request signal of the vehicle is input, charging, by a controller, a high voltage battery with residual generated power of the fuel cell or connecting a relay to a consumption resistor to consume the residual generated power as the consumption resistance;
• recognizing, by the controller, a starting request signal of the fuel cell vehicle;
• and
• when an output voltage of the fuel cell is reduced to be equal to or less than a required voltage, resetting the controller and outputting, by the controller, a starting permission signal of the fuel cell vehicle.

A restarting method of a restarting system for a fuel cell vehicle, comprising:

• when a shutdown request signal of the fuel cell vehicle is input, decreasing, by a controller, an output voltage of a fuel cell by operating a converter in a buck mode to charge a high voltage battery with residual generated power of the fuel cell;
• recognizing, by the controller, a starting request signal of the fuel cell vehicle;
• when the output voltage of the fuel cell is greater than a required voltage or a shutdown request signal is input and then a starting request signal is input within a predetermined time, connecting, by the controller, a relay to a consumption resistor to consume the residual generated power of the fuel cell as the consumption resistance;
• and
• when the output voltage of the fuel cell is reduced to be equal to or less than the required voltage, resetting the controller and outputting, by the controller, a starting permission signal of the fuel cell vehicle.

A controller for a restarting system of a fuel cell vehicle in which a relay and a consumption resistor are connected in parallel to a high voltage line connecting between a fuel cell and a high voltage battery, wherein the controller is configured to:

• operate the relay, when a shutdown request signal of the vehicle is input;
• charge the high voltage battery with residual generated power of the fuel cell or connect the relay to the consumption resistor to consume the residual generated power as the consumption resistance;
• and
• when a starting request signal of the vehicle is input, reset when an output voltage of the fuel cell is reduced to be equal to or less than a required voltage and then output a starting permission signal of the vehicle.