How to change Xavier fan trip temperature

How to modify xavier fan trip temperature?
The fan defaults to quite mode,Turns on the fan,when the temperature rises to 50° C.Turns off the fan when the temperature falls to 32° C
For example,I want to Turns on the fan,when the temperature rises to 30° C and Turns off the fan when the temperature falls to 20° C, How do I modify Thermal Zone?

hello baijianping1989,

please refer to developer guide, you may check Fan Mode Control session for different fan operation modes.
please also check Thermal Zone session. you may configure Thermal Zone by customize the device tree property setting.
thanks

I see,thank you very much