Fresh air system control method and device and air conditioning unit

The invention discloses a fresh air system control method and device and an air conditioning unit, and the method comprises the steps that the on-off state of an air valve is obtained; detecting a voltage signal of the photoelectric switch; wherein the voltage signal at least comprises a level change frequency and a final level state; whether the air valve is opened and closed in place is judged according to the voltage signal, and operation of the fresh air system is controlled according to the judgment result. The problem that in the prior art, in a fresh air system, in order to accurately detect the in-place condition of an air valve switch, double photoelectric switches need to be adopted, and resource waste is caused is solved, whether the air valve component switch is in place or not is simply and accurately determined, and cost is saved. 本发明公开了一种新风系统控制方法、装置及空调机组，其中，该方法包括：获取风阀的开关状态；检测光电开关的电压信号；其中，电压信号至少包括电平变化次数和最终电平状态；根据电压信号判断风阀是否开关到位，并根据判断结果控制新风系统的运行。本发明解决了现有技术中新风系统中为了精准检测风阀开关到位情况需要采用双光电开关，造成资源浪费的问题，简单