Apparatus for detecting gas leakage of a vehicle equipped with a fuel cell system

1. A device for detecting leakage of gas of a fuel cell vehicle, the device comprising:

a gas sensor configured to determine whether gas leaks based on a change in a temperature by a catalyst reaction; and

a vehicle control unit including a comparator configured to read a variation in temperature from the gas sensor, and configured to control a fuel cell vehicle,

wherein in a power off state of the fuel cell vehicle, a power application state is maintained in the comparator, power of the gas sensor is switched at regular periodic intervals, the comparator determines the variation in temperature measured by the gas sensor, and, when the variation in temperature exceeds a predetermined value, the power of the gas sensor is switched to normal power.

2. The device of claim 1 , further comprising:

a micro controller unit (MCU) within the vehicle control unit;

a vehicle control unit power supply configured to supply power to the vehicle control unit;

a detecting unit including a catalyst layer inside the gas sensor; and

a referring unit, which does not include a catalyst layer inside the gas sensor,

wherein, after the power of the gas sensor is switched to the normal power, when the concentration of gas measured by the detecting unit exceeds a predetermined value, power is applied to the vehicle control unit by the comparator, so that the vehicle control unit is activated.

3. The device of claim 2 , wherein the MCU is operated according to the activation of the vehicle control unit and checks whether gas leaks in the vehicle, and then automatically transmits whether the gas leaks in the vehicle to an information display unit of the vehicle or a designated user.

4. A method of detecting leakage of gas of a fuel cell vehicle, comprising:

a first operation of, when a power supply of the fuel cell vehicle is turned off, applying power to a comparator within a vehicle control unit, switching power of a gas sensor at regular periodic intervals, and determining, by the comparator, whether a variation in temperature measured by the gas sensor exceeds a predetermined value;

a second operation of switching the power of the gas sensor to normal power when the variation in temperature exceeds the predetermined value; and

a third operation of measuring, by a detecting unit within the gas sensor, a concentration of gas in a state where the power of the gas sensor is the normal power.

5. The method of claim 4 , further comprising:

after the third operation, a fourth operation of, when the concentration of gas measured by the detecting unit exceeds the predetermined concentration, activating the vehicle control unit according to the application of power to the vehicle control unit of the vehicle.

6. The method of claim 5 , further comprising:

after the fourth operation, a fifth operation of activating a micro controller unit (MCU) by the power of the vehicle control unit, and automatically transmitting whether the gas leaks in the vehicle to an information display unit of a vehicle system or a designated user.

7. The method of claim 6 , wherein, when the gas sensor determines that the gas leaks in the vehicle, the power of the gas sensor is maintained with normal power.

8. The method of claim 4 , wherein, when the variation in temperature does not exceed the predetermined value, the first operation is performed again.

9. The method of claim 4 , further comprising:

a sixth operation of, when the concentration of gas measured by the detecting unit is less than a predetermined concentration value, switching the power of the gas sensor to a state where the power of the gas sensor is switched at regular periodic intervals again.

10. The method of claim 9 , wherein, in the state where the power of the gas sensor is switched at regular periodic intervals again, the first operation is performed again.