Vehicle thermal management system and method for controlling the same

A vehicle thermal management system, comprising:

• a refrigerant subsystem including a refrigerant circulation path;
• a first coolant subsystem including a first coolant circulation path into which a first coolant flows and a power electronics (PE) component fluidly connected to the first coolant circulation path;
• a second coolant subsystem including a second coolant circulation path, and a radiator and a pump fluidly connected to the second coolant circulation path;
• a heat exchanger including a refrigerant passage fluidly connected to the refrigerant circulation path of the refrigerant subsystem, a first coolant passage fluidly connected to the first coolant circulation path of the first coolant subsystem, and a second coolant passage fluidly connected to the second coolant circulation path of the second coolant subsystem;
• and
• a controller operatively connected to the pump and configured to control the pump of the second coolant subsystem based on a temperature of a refrigerant flowing into the refrigerant passage of the heat exchanger and a temperature of a second coolant flowing into the second coolant passage of the heat exchanger;
• a first sensor disposed on a downstream side of the radiator;
• and
• a second sensor disposed on an upstream side of a compressor of the refrigerant subsystem,
• wherein the controller is configured to calculate a saturation temperature of the refrigerant passing through the refrigerant passage of the heat exchanger based on a suction pressure of the compressor detected by the second sensor, and
• wherein the controller is further configured to stop the pump of the second coolant subsystem in response that a sum of the calculated saturation temperature of the refrigerant and a correction temperature is higher than a coolant temperature detected by the first sensor.