Automatic control method of air conditioner of automobile

The invention discloses an automatic control method of an air conditioner of an automobile. The automatic control method of the air conditioner of the automobile comprises the steps that a controller initializes various parameters of a system, the controller reads detection values of sensors, a main parameter TD value and a temperature air door opening parameter Hi value are calculated according to the detection values of the sensors, and the controller achieves control over a compressor of the air conditioner, control over internal circulation and external circulation of the air conditioner, control over the air quantity of the air conditioner, control over air door modes of the air conditioner, and control over a temperature air door of the air conditioner according to the TD value and the Hi value. According to the automatic control method of the air conditioner of the automobile, automatic control over the environmental temperature of a compartment of the automobile can be achieved, and a driver can feel comfortable.