Method and system for improving comfort control precision of direct-current variable-frequency air conditioner

Abstract

The invention relates to the field of air conditioners, and discloses a method and a system for improving comfort control precision of a direct-current variable-frequency air conditioner. According tothe method and the system, under the condition that the cost of a hardware control scheme is not increased, the calculation and control precision of the PMV can be greatly improved, and the comfort level of a user for using the air conditioner is improved to the largest extent. The method comprises the following steps that firstly, a temperature-AD sampling value relation table is obtained by utilizing an air conditioner temperature-resistance relation table, and the indoor temperature resolution is improved through the temperature-AD sampling value relation table; then by adopting the mode of using the frequency being integer multiples of 0.1Hz for controlling the operation of a compressor in an increment/decrement mode, the fine adjustment capacity of the compressor is improved; and finally, under the condition that the cost of the hardware control scheme is not increased, the calculation and control precision of the PMV can be greatly improved, and the comfort level of the user forusing the air conditioner can be improved to the largest extent. The method and the system are suitable for controlling the comfort of the direct-current variable-frequency air conditioner.

Description

technical field [0001] The invention relates to the field of air conditioners, in particular to a method and system for improving the comfort control accuracy of DC inverter air conditioners. Background technique [0002] The air conditioner was born to change the human living environment and solve the problem of human comfort. The air conditioner is controlled and adjusted around the comfort of people, which is different from other refrigeration appliances such as refrigerators. The latter only needs to accurately control the temperature, while for the former, although the ambient temperature is very important, there are other key factors that affect people's comfort, such as: humidity, wind speed and so on. Common air conditioners are mainly based on temperature control, without considering the impact of other factors on human comfort. [0003] In order to solve this problem of air-conditioning comfort, P.0.Fanger proposed a comprehensive comfort index - PMV (predicted me...

AI Technical Summary

Problems solved by technology

[0034] The PMV control interval recommended by the previous standard is -0.5

In addition, since conventional air-conditioning technology solutions respond to changes in the indoor environment at 1°C, it is actually impossible to perceive and identify small changes in PMV. Therefore, it is difficult to realize the operation and control of PMV in a small range, and it is impossible for users to Really feel comfortable using the air conditioner

[0035] Among the currently disclosed technical solutions, there is a lack of a precise temperature control PMV method. The method is relatively complicated and not very accurate, and its PPD value is still very high. For example, the patent number: CN201310384380.9, the patent name "One An air conditioner and its control method”, as another example, the patent number is CN201710134835.X, and the patent name is “A control method for an air conditioner”

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