An Innovation PID Control Method of Split Air-conditioner Based on Online Prediction

According to the real-time deviation between indoor dry-bulb temperature and set temperature, traditional PID control method of split air-conditioning is used to calculate the output power of split air-conditioning. Using the control method in a split air conditioning system, the rise time is often in contradiction with the overshoot of the control temperature when the temperature deviation is larger. On the other hand, when the temperature deviation is small, the traditional PID control method can maintain the stability of control temperature. When the temperature deviation is larger, an online prediction method of air-conditioning load is presented according to the trend change of dry-bulb temperature in this paper. In order to reduce the rise time, the output power of split air-conditioning is set to be the maximum. When the temperature deviation is changed to be small, the output power of split air-conditioning will be adjusted to be the former predicted load, and then the PID control method will be implemented to keep the stability of temperature. Experiments show that the method described can well solve the contradiction between the rise time and the overshoot, the control precision can reach to 0.2°C.