Heat exchange system, method, non-transitory storage medium, and vehicle

1. A heat exchange system, comprising:

a first thermal circuit including a first device, a first pump, a first flow path configured to circulate a first coolant pumped by the first pump and cool the first device, and a second flow path configured to circulate the first coolant via a common flow path that is shared by a plurality of thermal circuits and cool the first device;

a second thermal circuit including a second device, a second pump, a third flow path configured to circulate a second coolant pumped by the second pump and cool the second device, and a fourth flow path configured to circulate the second coolant via the common flow path and cool the second device; and

a controller configured to switch, when the controller switches a flow path of the first thermal circuit from the first flow path to the second flow path and switches a flow path of the second thermal circuit from the fourth flow path to the third flow path, the fourth flow path to the third flow path and the first flow path to the second flow path.

2. The heat exchange system according to claim 1 , wherein:

the second flow path is set longer than the first flow path in the first thermal circuit; and

the controller is configured to, before switching the flow path of the first thermal circuit from the first flow path to the second flow path, issue a command to increase an amount of the first coolant pumped by the first pump to the first flow path.

3. The heat exchange system according to claim 1 , wherein:

the fourth flow path is set longer than the third flow path in the second thermal circuit; and

the controller is configured to, after switching the flow path of the second thermal circuit from the fourth flow path to the third flow path, issue a command to decrease an amount of the second coolant pumped by the second pump to the third flow path.

4. A flow path switching control method executed by a computer of a heat exchange system including a first thermal circuit having a first device, a first pump, a first flow path configured to circulate a first coolant pumped by the first pump and cool the first device, and a second flow path configured to circulate the first coolant via a common flow path that is shared by a plurality of thermal circuits and cool the first device and a second thermal circuit including a second device, a second pump, a third flow path configured to circulate a second coolant pumped by the second pump and cool the second device, and a fourth flow path configured to circulate the second coolant via the common flow path and cool the second device, the method comprising switching, when a flow path of the first thermal circuit is switched from the first flow path to the second flow path and a flow path of the second thermal circuit is switched from the fourth flow path to the third flow path, the fourth flow path to the third flow path and the first flow path to the second flow path.

5. A non-transitory storage medium storing instructions that are executable by one or more processors in a computer of a heat exchange system including a first thermal circuit having a first device, a first pump, a first flow path configured to circulate a first coolant pumped by the first pump and cool the first device, and a second flow path configured to circulate the first coolant via a common flow path that is shared by a plurality of thermal circuits and cool the first device and a second thermal circuit including a second device, a second pump, a third flow path configured to circulate a second coolant pumped by the second pump and cool the second device, and a fourth flow path configured to circulate the second coolant via the common flow path and cool the second device, and that cause the one or more processors to perform functions comprising switching, when a flow path of the first thermal circuit is switched from the first flow path to the second flow path and a flow path of the second thermal circuit is switched from the fourth flow path to the third flow path, the fourth flow path to the third flow path and the first flow path to the second flow path.

6. A vehicle comprising a heat exchange system including:

a first thermal circuit including a first device, a first pump, a first flow path configured to circulate a first coolant pumped by the first pump and cool the first device, and a second flow path configured to circulate the first coolant via a common flow path that is shared by a plurality of thermal circuits and cool the first device;

a second thermal circuit including a second device, a second pump, a third flow path configured to circulate a second coolant pumped by the second pump and cool the second device, and a fourth flow path configured to circulate the second coolant via the common flow path and cool the second device; and

a controller configured to switch, when the controller switches a flow path of the first thermal circuit from the first flow path to the second flow path and switches a flow path of the second thermal circuit from the fourth flow path to the third flow path, the fourth flow path to the third flow path and the first flow path to the second flow path.

7. The vehicle according to claim 6 , wherein:

the second flow path is set longer than the first flow path in the first thermal circuit; and

the controller is configured to, before switching the flow path of the first thermal circuit from the first flow path to the second flow path, issue a command to increase an amount of the first coolant pumped by the first pump to the first flow path.

8. The vehicle according to claim 6 , wherein:

the fourth flow path is set longer than the third flow path in the second thermal circuit; and

the controller is configured to, after switching the flow path of the second thermal circuit from the fourth flow path to the third flow path, issue a command to decrease an amount of the second coolant pumped by the second pump to the third flow path.