Vehicle-mounted air conditioner compressor control method and system

The invention provides a vehicle-mounted air conditioner compressor control method. The method comprises the steps that firstly, a target temperature of an air conditioner system is determined based on temperature sensor information or a required temperature input by a passenger; meanwhile, according to state information collected by a vehicle sensor, the total heat power of a passenger compartment can be calculated, the refrigerating capacity is determined through the rotating speed of an air conditioner compressor, and the system temperature is calculated; according to the target temperature and the system temperature, an outer ring uses the sliding mode control principle, an inner ring uses air conditioner compressor motor feedforward-feedback composite rotating speed control, the rotating speed of the air conditioner compressor can be controlled to be close to the target rotating speed, and therefore the system temperature is controlled to be within the demand temperature of the passenger or a comfortable