Vehicle glass defogging control method and system and vehicle

The invention belongs to the technical field of automobile control, and provides a vehicle glass defogging control method and system and a vehicle, and the method comprises the steps: obtaining the temperature and humidity data in the vehicle and the temperature and humidity data outside the vehicle, calculating the dew point temperature values in and outside the vehicle, and determining the dew point temperature value of the vehicle; and based on the difference value between the real-time temperature value of the glass and the dew-point temperature of the vehicle, a duty ratio output value for controlling the heating wire to work is determined, and a preset heating frequency is output to drive the heating wire to heat the glass. The system has the advantages that based on the temperature and humidity inside and outside the vehicle, the system controller controls the heating controller to drive the heating wire to heat at a certain duty ratio and heating frequency, the power and heating time of the heating wi