Controlling method and device for vehicle-mounted air conditioner and vehicle

The invention provides a controlling method and device for a vehicle-mounted air conditioner and the vehicle. The controlling method comprises the following steps that the terminal voltage of an air blower is determined according to air volume gear chosen by a user; the frequency range of a driving signal of an air door is determined according to the terminal voltage of the air blower, wherein thegreater the terminal voltage of the air blower, the smaller the frequency range of the driving signal of the air door; a driving motor of the air door is controlled according to the determined driving signal of the air door, so that the opening degree of the air door is adjusted to the target opening degree. According to the controlling method, the driving motor of the air door can be controlledaccording to the air volume gear, not only is the control precision of the motor improved, safety and reliability of the motor are better guaranteed, but also the controlling accuracy of the air dooris improved, so that runnin