Electric compressor for vehicle

A control method for an electric vehicle air conditioning system, the electric vehicle air conditioning system comprising:

• a compressor configured to compress and discharge a refrigerant;
• a 4-way valve configured to transfer the refrigerant discharged from the compressor to an external heat exchanger or an internal heat exchanger according to air conditioning modes;
• the external heat exchanger configured to heat exchange between the refrigerant transferred from the compressor or the internal heat exchanger and air outside a vehicle;
• the internal heat exchanger configured to heat exchange between the refrigerant transferred from the external heat exchanger and air supplied inside a HVAC module, or to heat exchange between the refrigerant transferred from the compressor and the air supplied inside the HVAC module;
• a heater core mounted around the internal heat exchanger and supplied with a cooling water heated through a cooling water electric heater, the heater core being configured to heat air discharged through the internal heat exchanger;
• a blower fan mounted inside the HVAC module and configured to blow air to the internal heat exchanger;
• and
• a controller configured to control the compressor, the cooling water electric heater, and the blower fan according to the air conditioning modes,
• the control method comprising:
• (a) determining, by the controller, that a current air conditioning mode is set to a heating mode;
• (b) determining, by the controller, that a request for entering an internal heat exchanger dry mode is received, while the current air conditioning mode is set to the heating mode;
• (c) entering the internal heat exchanger dry mode and performing, by the heater core and the blower fan, a drying operation on the internal heat exchanger for a predetermined time in response to determining that the request for entering the internal heat exchanger dry mode is received;
• and
• (d) operating a set normal heating mode after the internal heat exchanger dry mode is finished.