Fuel cell electric vehicle and method of controlling same

1 . A method of controlling a fuel cell electric vehicle, the method comprising:

determining an output power distribution ratio based on a target state of charge (SOC) error value of a battery and a total required output power amount, wherein the target SOC error value corresponds to a value obtained by subtracting a current SOC value from a target SOC value of the battery;

determining a required output power amount of a fuel cell stack from the total required output power amount of the battery and the fuel cell stack based on the output power distribution ratio of the fuel cell stack according to the current SOC value of the battery; and

controlling an operation of the fuel cell stack based on the required output power amount of the fuel cell stack.

2 . The method of claim 1 , further comprising determining the total required output power amount by adding a required output power amount of a driving motor and a power consumption amount of a balance of plant (BoP).

3 . The method of claim 1 , wherein determining the output power distribution ratio comprises adjusting the output power distribution ratio to become higher as the target SOC error value increases.

4 . The method of claim 1 , wherein determining the output power distribution ratio comprises controlling the output power distribution ratio to be linearized based on the total required output power amount.

5 . The method of claim 1 , wherein determining the required output power amount of the fuel cell stack is performed to determine the required output power amount of the fuel cell stack by multiplying the total required output power amount by the output power distribution ratio.

6 . The method of claim 1 , wherein controlling the operation of the fuel cell stack comprises:

determining a corrected required output power amount of the fuel cell stack by adding an output power correction amount of the fuel cell stack according to a dischargeable amount of the battery to the required output power amount of the fuel cell stack; and

controlling the operation of the fuel cell stack based on the corrected required output power amount.

7 . The method of claim 6 , further comprising:

when a required output power amount of the battery exceeds the dischargeable amount of the battery, setting the output power correction amount by subtracting the dischargeable amount of the battery from the required output power amount of the battery; and

when the required output power amount of the battery is less than or equal to the dischargeable amount, setting the output power correction amount to ‘0’.

8 . The method of claim 7 , further comprising determining the required output power amount of the battery by subtracting the required output power amount of the fuel cell stack from the total required output power amount.

9 . A fuel cell electric vehicle comprising:

a fuel cell stack;

a battery; and

a controller configured to:

determine an output power distribution ratio based on a target state of charge (SOC) error value of the battery and a total required output power amount, wherein the target SOC error value corresponds to a value obtained by subtracting a current SOC value from a target SOC value of the battery;

determine a required output power amount of the fuel cell stack from the total required output power amount of the battery and the fuel cell stack based on the output power distribution ratio of the fuel cell stack according to the current SOC value of the battery; and

control an operation of the fuel cell stack based on the required output power amount of the fuel cell stack.

10 . The fuel cell electric vehicle of claim 9 , wherein the controller is configured to determine the total required output power amount by adding a required output power amount of a driving motor and a power consumption amount of a balance of plant (BoP).

11 . The fuel cell electric vehicle of claim 9 , wherein the controller is configured to adjust the output power distribution ratio to become higher as the target SOC error value increases.

12 . The fuel cell electric vehicle of claim 9 , wherein the controller is configured to control the output power distribution ratio to be linearized based on the total required output power amount.

13 . The fuel cell electric vehicle of claim 9 , wherein the controller is configured to determine the required output power amount of the fuel cell stack by multiplying the total required output power amount by the output power distribution ratio.

14 . A fuel cell electric vehicle comprising:

a fuel cell stack;

a battery; and

a controller configured to:

determine an output power distribution ratio based on a target state of charge (SOC) error value of the battery and a total required output power amount, wherein the target SOC error value corresponds to a value obtained by subtracting a current SOC value from a target SOC value of the battery;

determine a required output power amount of the fuel cell stack from the total required output power amount of the battery and the fuel cell stack based on the output power distribution ratio of the fuel cell stack according to the current SOC value of the battery;

control an operation of the fuel cell stack based on the required output power amount of the fuel cell stack;

determine a corrected required output power amount of the fuel cell stack by adding an output power correction amount of the fuel cell stack according to a dischargeable amount of the battery to the required output power amount of the fuel cell stack; and

control the operation of the fuel cell stack based on the corrected required output power amount.

15 . The fuel cell electric vehicle of claim 14 , wherein:

when a required output power amount of the battery exceeds the dischargeable amount of the battery, the controller is configured to set the output power correction amount by subtracting the dischargeable amount of the battery from the required output power amount of the battery; and

when the required output power amount of the battery is less than or equal to the dischargeable amount, the controller is configured to set the output power correction amount to ‘0’.

16 . The fuel cell electric vehicle of claim 15 , wherein the controller is configured to determine the required output power amount of the battery by subtracting the required output power amount of the fuel cell stack from the total required output power amount.

17 . The fuel cell electric vehicle of claim 14 , wherein the controller is further configured to determine the output power correction amount by setting the output power correction amount to a value obtained by subtracting the dischargeable amount of the battery from the required output power amount of the battery when the required output power amount of the battery exceeds the dischargeable amount of the battery, and setting the output power correction amount to zero when the required output power amount of the battery is less than or equal to the dischargeable amount of the battery.

18 . The fuel cell electric vehicle of claim 14 , wherein the controller is further configured to determine the dischargeable amount of the battery by selecting a smaller value among a dischargeable output power of the battery and an output power obtained by multiplying a dischargeable current of the battery by a voltage of the battery.

19 . The fuel cell electric vehicle of claim 9 , wherein the controller is further configured to determine a dischargeable amount of the battery by selecting a smaller value among a dischargeable output power of the battery and an output power obtained by multiplying a dischargeable current of the battery by a voltage of the battery.

20 . The fuel cell electric vehicle of claim 9 , wherein the controller is further configured to determine the required output power amount of the fuel cell stack such that the required output power amount of the fuel cell stack increases as the target SOC error value of the battery increases and as the total required output power amount increases.