Device and method for monitoring liquid level of liquid storage tanks for vehicle

A method for monitoring a liquid level of a liquid storage tank for a vehicle, the method comprising:

• sensing, by a liquid level sensor in which an electromotive force amplification layer is coated on one surface of an electrode, the liquid level of a liquid in a state in which the liquid level sensor is installed inside or outside the liquid storage tank;
• determining whether a sensed value sensed by the liquid level sensor is a normal value for sensing the liquid level of the liquid or an abnormal value for sensing the liquid level of the liquid,
• wherein:
• the sensed value is the normal value when the liquid is in a liquid state,
• the sensed value is the abnormal value when the liquid is in a frozen state, and
• the liquid level sensor determines the normal value and the abnormal value based on a difference in permittivity between liquid and ice;
• when the sensed value sensed by the liquid level sensor is determined as being the abnormal value, driving, by a controller, a heating device for resolving a freezing of the liquid;
• and
• when the sensed value sensed by the liquid level sensor is determined as being the normal value after the driving of the heating device, interrupting the driving of the heating device.