Method for controlling vehicle air- conditioning system and a compressor to which the method is applied

A method for controlling a vehicle air-conditioning system, the method comprising:

• a first step of sensing one or more temperatures or pressures to determine a refrigerant amount state of a compressor provided in an air-conditioning system after a vehicle is turned on;
• a second step for switching to a refrigerant amount determination mode after the first step;
• a third step for waiting for 1 hour after the second step;
• a fourth step for determining whether an evaporator provided in the air-conditioning system meets a target evaporator temperature Evap T after the third step;
• and
• a fifth step for determining whether a predetermined target deviation temperature of an outside air temperature is met after the fourth step, wherein whether the refrigerant amount state of the compressor is normal is determined through the fourth step or the fifth step,
• wherein the second step comprises:
• an on-state maintaining step for maintaining the air-conditioning system in an on state while maintaining the vehicle in an idle state;
• an outside air mode operating step for operating the air-conditioning system in an outside air mode;
• a lowest temperature operating step for operating the air-conditioning system at a lowest temperature;
• and
• a blower fan operating step for operating a blower fan provided in the air-conditioning system to generate a maximum amount of air flow.