METHOD OF CONTROLLING A VEHICLE THERMAL MANAGEMENT SYSTEM

A method of controlling a vehicle thermal management system includes determining, by a controller, a vehicle required heat amount based on an amount of heat required for cabin heating and an amount of heat required for battery warming-up when a heating, ventilation, and air conditioning (HVAC) subsystem operates in a heating mode; controlling, by the controller, operations of the HVAC subsystem and the coolant subsystem to minimize a work quantity of a compressor of the HVAC subsystem and minimize a heat release amount of a refrigerant circulating in the HVAC subsystem when the vehicle required heat amount is greater than a predetermined threshold; determining, by the controller, a heat absorption amount of the refrigerant; and increasing the work quantity of the compressor by a predetermined value when the heat absorption amount of the refrigerant is greater than the heat release amount of the refrigerant.