Control method and device of air conditioner and air conditioner having the same

Abstract

Disclosed in the present application are an air conditioner control method, an air conditioner control apparatus and an air conditioner having the same, the air conditioner being operating in a low-temperature hybrid mode. The method comprises: determining that an outdoor heat exchanger of an air conditioner operates in an evaporator state; collecting a state parameter for identifying a refrigerant state, and acquiring a state signal of a refrigerant of a refrigerating indoor machine according to the state parameter, wherein the state parameter at least comprises an overheat degree of the refrigerating indoor machine; and adjusting an opening degree of an electronic expansion valve of an outdoor machine according to the state signal of the refrigerating indoor machine. The method can adjust an opening degree of an electronic expansion valve of an outdoor machine according to a state signal of a refrigerating indoor machine when an outdoor heat exchanger of an air conditioner operates in an evaporator state, effectively improving control reliability, expanding the range of reliable operation of a system, and effectively addressing the problem of reasonable distribution of refrigerant between a refrigerating indoor machine and an outdoor machines under a low-temperature condition.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to an air conditioner control method and device and an air conditioner with the same. Background technique [0002] At present, air conditioners sometimes operate under the conditions of high indoor temperature and low outdoor temperature (such as -25°C to 0°C or lower), such as communication base stations, high-end restaurants, bakeries, hotels, dance halls and other places. A large number of heat sources make the indoor temperature high, and these places have special requirements on the quality of indoor air. It is not possible to directly introduce low-temperature outdoor air into the room to reduce the indoor temperature, and the air conditioner is required to cool the room. Conventional air conditioners can only cool when the outdoor temperature is in the range of 7°C to 43°C, and cannot cool when the outdoor temperature is -25°C to 0°C or lower. [0003] Also as an e...

AI Technical Summary

Problems solved by technology

[0004] When the electronic expansion valve of the external unit is opened larger, the refrigerant flowing to the refrigeration internal unit is less, and it is easy to have a bias flow between the refrigeration internal units

When the electronic expansion valve of the external unit is opened slightly, the refrigerant flowing to the refrigeration internal unit is more, and the low pressure is low, and the internal unit is prone to frosting

The superheat required by the refrigeration internal unit is relatively large, and the current control method of constant superheat is difficult to adapt to such an application scenario

In the case of pressure control, when the outdoor unit is used as an evaporator in the low-temperature mixed mode, the target low pressure of the outdoor unit is used as the control target, and the output of the cooling indoor unit cannot be controlled, which needs to be solved

Images