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(1) 较早采用的是定时除霜控制，这种控制往往按照最恶劣的环境条件来设定时间，因此在不同的环境条件下必然产生不必要的能源浪费。 (1) the timing defrosting control was adopted earlier. This control often set time according to the worst environmental conditions. Therefore, under different environmental conditions, unnecessary energy waste is inevitable. (2) 时间温度控制方法，这是目前普遍采用的方法，通过在时间量的基础上考虑了温度量，比单纯的时间法有进步，同时部分地考虑了机组工作环境的影响,但是仍不能很好地反映热泵机组在各种工况下公道除霜的题目。 (2) the time temperature control method, this method is widely used, based on the amount of time is taken into account in the amount of temperature, there is progress than the time only, at the same time some influence of the working environment of the unit, but still can not reflect the heat pump under different conditions of reasonable defrosting topic. (3) 通过吸气管上的吸气压力可以得到饱和蒸发温度，当在蒸发器表面结霜严重时，蒸发温度与大气温度的差会加大，以饱和蒸发温度与环境温度的差值能较好的反映结霜情况，但是对于环境温度变化剧烈的场合仍会有误动作产生。 (3) through the suction pipe of the suction pressure can be saturated when evaporating temperature in the evaporator frosting is serious, evaporation temperature and atmospheric temperature difference will increase, the difference of saturated evaporation temperature and the ambient temperature can reflect the frost condition better, but for the dramatic changes in the ambient temperature occasions there will be false action. (4) 由于蒸发器表面结霜，会增大蒸发器两侧的空气压差，通过检测蒸发器两侧的空气压差来确定是否需要除霜，这种方法可以实现根据需要除霜，但在蒸发器表面有异物或严重积灰时会误动作，而且微压差传感器的价格较高。 (4) because of evaporator surface frost, will increase the air pressure difference on both sides of the evaporator, through the detection of the evaporator on both sides of the air pressure difference to determine whether there is a need to defrost, this method can be realized according to the need to defrost, but on the evaporator surface a foreign body or serious dust will malfunction, and the price of micro differential pressure sensor high.