Vehicle thermal management system and method of controlling the same

A vehicle thermal management system comprising:

• a compressor configured to compress and discharge a refrigerant;
• an indoor condenser provided in an indoor air conditioning device and configured to heat an interior space by using a refrigerant compressed by the compressor;
• an outdoor heat exchanger connected between an outlet of the indoor condenser and an inlet of the compressor and configured to receive the refrigerant discharged from the indoor condenser and absorb heat from outside air by expanding the refrigerant by using a first expansion valve;
• a chiller connected in series or in parallel with the outdoor heat exchanger and configured to absorb heat from a coolant in a heating element of a vehicle by expanding the refrigerant by using a second expansion valve;
• a controller configured to operate the compressor during the process of heating the interior space and adjust a degree to which the outdoor heat exchanger and the chiller absorb heat on the basis of at least one factor among an outside air temperature, a refrigerant temperature, and a temperature of the coolant flowing in the chiller, and
• a bypass line branching off from an upstream point from the outdoor heat exchanger and connected to a downstream point from the outdoor heat exchanger;
• and a bypass valve configured to control the refrigerant that bypasses the outdoor heat exchanger through the bypass line;
• and
• a refrigerant temperature sensor disposed between the first expansion valve and the outdoor heat exchanger and configured to measure a temperature of the refrigerant expanded by the first expansion valve, wherein the controller controls the bypass valve by comparing the outside air temperature and the refrigerant temperature measured by the refrigerant temperature sensor.