Control method and device for electronic expansion valve of air conditioner internal unit, and air conditioner

Abstract

Embodiments of the present invention provide a control method and device for an electronic expansion valve of an air conditioner internal unit, and an air conditioner, and relate to the technical field of air conditioners. The method for controlling the electronic expansion valve of the air conditioner inner unit includes: acquiring the ambient temperature of the air conditioner inner unit and the set temperature of the air conditioner when the air conditioner is in cooling operation. Calculate the difference between the ambient temperature and the set temperature to obtain the temperature difference between reaching temperature and shutdown. If the temperature difference between reaching the temperature and shutting down is less than the first preset adjustment temperature and greater than the second preset adjustment temperature, then increase the target superheat degree of the evaporator of the air conditioner internal unit, wherein the first preset adjustment temperature indicates that the air conditioner has a temperature shutdown The critical temperature of the trend. According to the target superheat degree, fuzzy control is performed on the electronic expansion valve of the air conditioner internal unit to reduce the cooling output of the air conditioner. The control method and device for the electronic expansion valve of the air conditioner internal unit and the air conditioner can control the cooling capacity of the air conditioner, effectively avoiding frequent start and stop.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to a control method and device for an electronic expansion valve of an air conditioner internal unit and an air conditioner. Background technique [0002] Electronic expansion valve is a commonly used throttling element in air-conditioning systems. Compared with capillary throttling, electronic expansion valves can adjust the throttling diameter, which is suitable for air-conditioning systems with a wide range of environments and large system flow, such as inverters, multi-lines, etc. . [0003] At present, the opening degree control of the electronic expansion valve mostly adopts the superheat control, so that the refrigerant at the outlet of the evaporator has a certain degree of superheat, so as to ensure that the compressor does not inhale liquid and ensure the safety of the compressor. [0004] However, the control idea of ​​the electronic expansion valve in the relat...

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Problems solved by technology

[0004] However, the control idea of ​​the electronic expansion valve in the related art is difficult to solve the problem that when the cooling of the air conditioner is close to the temperature and shuts down (that is, the ambient temperature is close to the set temperature), the air conditioner is prone to frequent shutdowns when the temperature is reached, which affects the user experience.

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