Control method of air conditioning system

Abstract

The invention discloses a control method of an air conditioning system. The control method comprises the following steps of measuring the environment temperature T4 of the environment where an outdoor heat exchanger is located, and the coolant temperature at the second end of the outdoor heat exchanger or the coolant temperature T3 of the coolant flow path between the second end and the second valve port of the outdoor heat exchanger, and detecting the preset operation mode, chosen by a user, of the air conditioning system after the air conditioning system is started up; judging which is larger between T3 and T4 when the preset operation mode is the cooling mode, determining that a four-way valve is poorly reversing if T3 minus T4 is equal to or less than the first preset value B1, and controlling the four-way valve to reverse to make the actual operation mode of an air conditioner be the cooling mode; and judging which is larger between T3 and T4 when the preset operation mode is the heating mode, and determining that the four-way valve is poorly reversing if T4 minus T3 is equal to or less than the second preset value B2, and controlling the four-way valve to reverse to make the actual operation mode of the air conditioner be the heating mode. According to the control method of the air conditioning system, the cost can be reduced.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a control method for an air conditioning system. Background technique [0002] The air-conditioning system is generally provided with a four-way valve, and the air-conditioning system can be switched between the cooling mode and the heating mode through the reversing of the four-way valve. Generally, when the four-way valve is reversing, it is impossible to judge the reversing pressure difference by itself, and it is also impossible to judge whether the reversing is successful. The poor switching of the four-way valve makes it difficult to establish the high and low pressure difference of the air conditioning system, resulting in insufficient cooling or heating capacity of the air conditioning system, and has an impact on the reliability of the compressor. [0003] In the related art, temperature sensors are installed at the two ports corresponding to the outdoor heat e...

AI Technical Summary

Problems solved by technology

Generally, when the four-way valve is reversing, it is impossible to judge the reversing pressure difference by itself, and it is also impossible to judge whether the reversing is successful.

The poor switching of the four-way valve makes it difficult to establish the high and low pressure difference of the air conditioning system, resulting in insufficient cooling or heating capacity of the air conditioning system, and has an impact on the reliability of the compressor

[0003] In the related art, temperature sensors are installed at the two ports corresponding to the outdoor heat exchanger and the indoor heat exchanger of the four-way valve to determine whether the four-way valve is reversing successfully, but the additional two temperature sensors increase the manufacturing cost

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