Control method of air-conditioning system and air-conditioning system

Abstract

The invention discloses a control method of an air-conditioning system and the air-conditioning system. The control method comprises the following steps: 1, when receiving a signal of a switch four-way valve, respectively detecting pressure values (P1 and P2) of an outlet and an inlet of a compressor; 2, calculating the pressure difference delta P of (P1 and P2), judging whether delta P is within the range of preset pressure different delta P0 or not, if delta P is within the range of delta P0, controlling the four-way valve to perform steering action, if delta P is less than delta P0, controlling the compressor to increase the exhaust amount, if delta P is greater than delta P0, controlling the compressor to reduce the exhaust amount. Through the adoption of the control method disclosed by the invention, the pressure difference of the four-way valve when steering is effectively controlled, the reliability of the four-way valve in steering is ensured, and moreover relatively great instantaneous noise caused by too large pressure difference is reduced when the four-way valve steers.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to an air conditioning system control method and the air conditioning system. Background technique [0002] Cooling and heating air conditioners usually have cooling, heating, defrosting and oil return operating modes. The switching of these operating modes is realized by the four-way valve being in different connection positions, so it is necessary to control the four-way valve for reversing action. [0003] At present, the reversing of the four-way valve is carried out according to the fixed action sequence mode of the unit itself. Basically, the pressure difference between the high and low sides of the four-way valve is not considered. The pressure difference between the high and low sides is also different, and if the four-way valve reversing is performed in a fixed pattern, it will cause the following problems: [0004] If the pressure difference between the high and ...

AI Technical Summary

Problems solved by technology

[0004] If the pressure difference between high and low pressure is too small when the four-way valve changes direction, it will lead to poor changeover of the four-way valve, resulting in the phenomenon of "cross-gas"; The reversing of the four-way valve produces a lot of noise, and the impact generated by the excessive pressure difference reversing will damage the four-way valve and affect the reliability of the valve body

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