Aiming at problem that when the car starts in summer

the temperature inside the car is higher

and the air conditioner can not reach the comfortable temperature of the human body in a short time

vehicle intelligent fan system is put forward. The main purpose is to optimize the universal serial bus（ USB） fan in the life and apply it to vehicles

so that the fan can automatically adjust wind speed according to environmental temperature inside the car

and reduce the temperature of the passengers. The system uses STM32 as the main control chip

it also has a temperature detection module

motor control module and liquid crystal display（ LCD） module. After the hardware connection and programming debugging

the fan is automatically opened and stopped according to the change of the environmental temperature inside the car. Analysis on experimental data shows that the system can realize the intelligent speed regulation of the fan according to the change of the temperature in the car. Besides

the LCD can display the current temperature and the rotating state of the fan.