A control method and device of an air conditioner, the air conditioner and a storage medium

Abstract

The application discloses a control method and device of an air conditioner, the air conditioner and a storage medium, and relates to the technical field of air conditioners. The method comprises the following steps: in the case that a defrosting signal of the air conditioner is received, it is determined whether a reversing pressure difference of a four-way valve in the air conditioner is greater than or equal to a preset minimum pressure difference value and less than or equal to a preset maximum pressure difference value; if it is determined that the reversing pressure difference of the four-way valve in the air conditioner is greater than or equal to the preset minimum pressure difference value and less than or equal to the preset maximum pressure difference value, it is determined that the four-way valve in the air conditioner needs to perform a reversing operation during defrosting; according to an outdoor environment temperature of the air conditioner and the reversing pressure difference of the four-way valve in the air conditioner, a reversing timing of the four-way valve in the air conditioner is determined to control the four-way valve in the air conditioner to perform the reversing operation during defrosting. According to the scheme, the reversing timing of the four-way valve can be adjusted according to the outdoor environment temperature and the reversing pressure difference of the four-way valve during defrosting, the reversing noise of the four-way valve can be reduced, and the user experience is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of air conditioners, and particularly relates to a control method and device of an air conditioner, the air conditioner, and a storage medium, and more particularly relates to a control method and device of an air conditioner capable of reducing defrosting reversing noise of a four-way valve, the air conditioner, and a storage medium. BACKGROUND

[0002] The four-way valve (i.e., four-way reversing valve) is an important functional component of an air conditioner (such as a heat pump air conditioner). Through reversing of the four-way valve, the flow direction of refrigerant in the heat pump air conditioner can be changed, and thus switching between the cooling mode and the heating mode of the heat pump air conditioner, and the defrosting function of the heating mode can be realized, so as to meet the switching demand of different operating modes of the heat pump air conditioner by a user. When the four-way valve of the heat pump air conditioner is reversed, the reversing time of the four-way valve is determined according to the stop time of the compressor. However, since the pressure difference between the high-pressure side and the low-pressure side of the four-way valve is large at the reversing time, and the pressure between the high-pressure side and the low-pressure side of the four-way valve is balanced instantaneously when the four-way valve switches the flow direction of the refrigerant, the reversing noise of the four-way valve is large, which affects the user experience.

[0003] The above content is only used to assist in understanding the technical solutions of the present application, and does not represent the acknowledgement of the above content as prior art. SUMMARY

[0004] The present application aims to provide a control method and device of an air conditioner, the air conditioner, and a storage medium, so as to solve the problem that when the four-way valve of the air conditioner (such as a heat pump air conditioner) is reversed, the reversing time of the four-way valve is determined according to the stop time of the compressor, but since the pressure difference between the high-pressure side and the low-pressure side of the four-way valve is large at the reversing time, and the pressure between the high-pressure side and the low-pressure side of the four-way valve is balanced instantaneously when the four-way valve switches the flow direction of the refrigerant, the reversing noise of the four-way valve is large, which affects the user experience. Through adjusting the reversing timing of the four-way valve according to the outdoor environment temperature and the reversing pressure difference of the four-way valve during defrosting, the reversing noise of the four-way valve can be reduced, and the user experience can be improved.

[0005] The application provides a control method of an air conditioner, comprising: obtaining an outdoor environment temperature of the air conditioner and obtaining a reversing pressure difference of a four-way valve in the air conditioner when the air conditioner is running in a heating mode; wherein the reversing pressure difference of the four-way valve in the air conditioner is a suction and discharge port pressure difference value of a compressor in the air conditioner when the four-way valve in the air conditioner reverses; determining whether the reversing pressure difference of the four-way valve in the air conditioner is greater than or equal to a preset minimum pressure difference value and less than or equal to a preset maximum pressure difference value when a defrost signal of the air conditioner is received; determining that the four-way valve in the air conditioner needs to perform a reversing operation during defrosting if it is determined that the reversing pressure difference of the four-way valve in the air conditioner is greater than or equal to the preset minimum pressure difference value and less than or equal to the preset maximum pressure difference value; determining a reversing timing sequence of the four-way valve in the air conditioner according to the outdoor environment temperature of the air conditioner and the reversing pressure difference of the four-way valve in the air conditioner; and controlling the four-way valve in the air conditioner to perform the reversing operation during defrosting according to the reversing timing sequence of the four-way valve in the air conditioner.

[0006] In some embodiments, the reversing pressure difference of the four-way valve in the air conditioner is obtained in any one of the following ways: a first obtaining way: obtaining a discharge port pressure value of the compressor in the air conditioner and obtaining a suction port pressure value of the compressor in the air conditioner; taking an absolute value of a difference between the discharge port pressure value of the compressor in the air conditioner and the suction port pressure value of the compressor in the air conditioner as the reversing pressure difference of the four-way valve in the air conditioner; and a second obtaining way: obtaining a coil temperature of an indoor heat exchanger of the air conditioner, denoted as an indoor coil temperature of the air conditioner; obtaining a coil temperature of an outdoor heat exchanger of the air conditioner, denoted as an outdoor coil temperature of the air conditioner; converting the indoor coil temperature of the air conditioner into a pressure value, denoted as a first pressure value; converting the outdoor coil temperature of the air conditioner into a pressure value, denoted as a second pressure value; and taking an absolute value of a difference between the first pressure value and the second pressure value as the reversing pressure difference of the four-way valve in the air conditioner.

[0007] In some embodiments, the reversing timing sequence of the four-way valve in the air conditioner is determined according to the outdoor environment temperature of the air conditioner and the reversing pressure difference of the four-way valve in the air conditioner, comprising: determining a current pressure difference interval to which the reversing pressure difference of the four-way valve in the air conditioner belongs in a set pressure difference range; determining a current temperature interval to which the outdoor environment temperature of the air conditioner belongs in a set temperature range when the reversing pressure difference of the four-way valve in the air conditioner belongs to the current pressure difference interval in the set pressure difference range; determining a power-off interval time of the four-way valve in the air conditioner when the outdoor environment temperature of the air conditioner belongs to the current temperature interval in the set temperature range; and determining the reversing timing sequence of the four-way valve in the air conditioner according to the power-off interval time of the four-way valve in the air conditioner.

[0008] In some embodiments, the set pressure difference range comprises a first pressure difference interval and a second pressure difference interval; determining the current pressure difference interval to which the reversing pressure difference of the four-way valve in the air conditioner belongs in the set pressure difference range comprises: if the reversing pressure difference of the four-way valve in the air conditioner is greater than or equal to a first set pressure difference and less than or equal to a second set pressure difference, determining the current pressure difference interval as the first pressure difference interval; the first set pressure difference is the preset minimum pressure difference value, and the second set pressure difference is less than or equal to the preset maximum pressure difference value; if the reversing pressure difference of the four-way valve in the air conditioner is greater than the second set pressure difference, determining the current pressure difference interval as the second pressure difference interval; the set temperature range comprises a first temperature interval, a second temperature interval and a third temperature interval; determining the current temperature interval to which the outdoor environment temperature of the air conditioner belongs in the set temperature range comprises: if the outdoor environment temperature of the air conditioner is less than a first set temperature, determining the current temperature interval as the first temperature interval; if the outdoor environment temperature of the air conditioner is greater than or equal to the first set temperature and less than or equal to a second set temperature, determining the current temperature interval as the second temperature interval; if the outdoor environment temperature of the air conditioner is greater than the second set temperature, determining the current temperature interval as the third temperature interval.

[0009] In some embodiments, the interval time of the four-way valve in the air conditioner is determined under the current temperature interval to which the outdoor environment temperature of the air conditioner belongs in the set temperature range, comprising: under the first pressure difference interval, if the current temperature interval is the first temperature interval, the interval time of the four-way valve is determined as a first set time; under the first pressure difference interval, if the current temperature interval is the second temperature interval, the interval time of the four-way valve is determined as a second set time; under the first pressure difference interval, if the current temperature interval is the third temperature interval, the interval time of the four-way valve is determined as a third set time; under the second pressure difference interval, if the current temperature interval is the first temperature interval, the interval time of the four-way valve is determined as a fourth set time; under the second pressure difference interval, if the current temperature interval is the second temperature interval, the interval time of the four-way valve is determined as a fifth set time; under the second pressure difference interval, if the current temperature interval is the third temperature interval, the interval time of the four-way valve is determined as a sixth set time; wherein the fourth set time is greater than the first set time, the fifth set time is greater than the second set time, and the sixth set time is greater than the third set time.

[0010] According to the method, the application provides a control device of an air conditioner, which comprises: an acquisition unit configured to acquire an outdoor environment temperature of the air conditioner and acquire a reversing pressure difference of a four-way valve in the air conditioner when the air conditioner is running in a heating mode; wherein the reversing pressure difference of the four-way valve in the air conditioner is a suction and discharge port pressure difference value of a compressor in the air conditioner when the four-way valve reverses; a control unit configured to determine whether the reversing pressure difference of the four-way valve in the air conditioner is greater than or equal to a preset minimum pressure difference value and less than or equal to a preset maximum pressure difference value when receiving a defrosting signal of the air conditioner; the control unit is further configured to determine that the four-way valve in the air conditioner needs to perform a reversing operation during defrosting if the reversing pressure difference of the four-way valve in the air conditioner is greater than or equal to the preset minimum pressure difference value and less than or equal to the preset maximum pressure difference value; and the control unit is further configured to determine a reversing timing of the four-way valve in the air conditioner according to the outdoor environment temperature of the air conditioner and the reversing pressure difference of the four-way valve in the air conditioner, and control the four-way valve in the air conditioner to perform the reversing operation during defrosting according to the reversing timing of the four-way valve in the air conditioner.

[0011] In some embodiments, the acquisition unit acquires the reversing pressure difference of the four-way valve in the air conditioner by any of the following acquisition methods: a first acquisition method of acquiring a discharge port pressure value of the compressor in the air conditioner and acquiring a suction port pressure value of the compressor in the air conditioner, taking an absolute value of a difference between the discharge port pressure value of the compressor in the air conditioner and the suction port pressure value of the compressor in the air conditioner as the reversing pressure difference of the four-way valve in the air conditioner; and a second acquisition method of acquiring a coil temperature of an indoor heat exchanger of the air conditioner, taking the coil temperature of the indoor heat exchanger of the air conditioner as an indoor coil temperature of the air conditioner, acquiring a coil temperature of an outdoor heat exchanger of the air conditioner, taking the coil temperature of the outdoor heat exchanger of the air conditioner as an outdoor coil temperature of the air conditioner, taking a pressure value converted from the indoor coil temperature of the air conditioner as a first pressure value, taking a pressure value converted from the outdoor coil temperature of the air conditioner as a second pressure value, and taking an absolute value of a difference between the first pressure value and the second pressure value as the reversing pressure difference of the four-way valve in the air conditioner.

[0012] In some embodiments, the control unit determines the reversing sequence of the four-way valve in the air conditioner according to the outdoor ambient temperature of the air conditioner and a reversing pressure difference of the four-way valve in the air conditioner, including: determining a current pressure difference interval to which the reversing pressure difference of the four-way valve in the air conditioner belongs in a set pressure difference range; determining a current temperature interval to which the outdoor ambient temperature of the air conditioner belongs in a set temperature range, under the current pressure difference interval to which the reversing pressure difference of the four-way valve in the air conditioner belongs in the set pressure difference range; determining a power-off interval time of the four-way valve in the air conditioner, under the current temperature interval to which the outdoor ambient temperature of the air conditioner belongs in the set temperature range; and determining the reversing sequence of the four-way valve in the air conditioner according to the power-off interval time of the four-way valve in the air conditioner.

[0013] In some embodiments, the set pressure difference range includes a first pressure difference interval and a second pressure difference interval; the control unit determines the current pressure difference interval to which the reversing pressure difference of the four-way valve in the air conditioner belongs in the set pressure difference range, including: if the reversing pressure difference of the four-way valve in the air conditioner is greater than or equal to a first set pressure difference and less than or equal to a second set pressure difference, determining the current pressure difference interval as the first pressure difference interval; the first set pressure difference is the preset minimum pressure difference value, and the second set pressure difference is less than or equal to the preset maximum pressure difference value; if the reversing pressure difference of the four-way valve in the air conditioner is greater than the second set pressure difference, determining the current pressure difference interval as the second pressure difference interval; the set temperature range includes a first temperature interval, a second temperature interval and a third temperature interval; the control unit determines the current temperature interval to which the outdoor ambient temperature of the air conditioner belongs in the set temperature range, including: if the outdoor ambient temperature of the air conditioner is less than a first set temperature, determining the current temperature interval as the first temperature interval; if the outdoor ambient temperature of the air conditioner is greater than or equal to the first set temperature and less than or equal to a second set temperature, determining the current temperature interval as the second temperature interval; if the outdoor ambient temperature of the air conditioner is greater than the second set temperature, determining the current temperature interval as the third temperature interval.

[0014] In some embodiments, the control unit determines the power-off interval time of the four-way valve in the air conditioner when the outdoor ambient temperature of the air conditioner is in a current temperature interval belonging to a set temperature range, including: in the first pressure difference interval, if the current temperature interval is the first temperature interval, determining the power-off interval time of the four-way valve as a first set time; in the first pressure difference interval, if the current temperature interval is the second temperature interval, determining the power-off interval time of the four-way valve as a second set time; in the first pressure difference interval, if the current temperature interval is the third temperature interval, determining the power-off interval time of the four-way valve as a third set time; in the second pressure difference interval, if the current temperature interval is the first temperature interval, determining the power-off interval time of the four-way valve as a fourth set time; in the second pressure difference interval, if the current temperature interval is the second temperature interval, determining the power-off interval time of the four-way valve as a fifth set time; in the second pressure difference interval, if the current temperature interval is the third temperature interval, determining the power-off interval time of the four-way valve as a sixth set time; wherein the fourth set time is greater than the first set time, the fifth set time is greater than the second set time, and the sixth set time is greater than the third set time.

[0015] In another aspect, the present application provides an air conditioner, which is matched with the above-mentioned device, and includes the above-mentioned control device of the air conditioner.

[0016] In another aspect, the present application provides a storage medium, which includes a stored program, wherein the device where the storage medium is located executes the above-mentioned control method of the air conditioner when the program runs.

[0017] Therefore, the scheme of the present application can reduce the reversing noise of the four-way valve and improve the user experience by adjusting the reversing timing of the four-way valve according to the outdoor ambient temperature and the reversing pressure difference of the four-way valve during the defrosting period when the heat pump air conditioner is controlled to enter the defrosting period if the defrosting signal is received during the heating operation of the air conditioner (such as the heat pump air conditioner).

[0018] Other features and advantages of the present application will be described in the following description, and will become apparent from the description, or will be learned from the practice of the present application.

[0019] The technical solutions of the present application will be further described in detail below with the help of the accompanying drawings and embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 Flow chart of an embodiment of the control method of the air conditioner of the present application;

[0021] Figure 2 Flow chart of an embodiment of the method of the present application for determining the reversing pressure difference of the four-way valve according to the suction and discharge port pressure difference of the compressor;

[0022] Figure 3 Flow chart of an embodiment of the method of the present application for determining the reversing pressure difference of the four-way valve according to the temperature difference of the outdoor heat exchanger coil;

[0023] Figure 4 Flow chart of an embodiment of the method of the present application for determining the reversing timing of the four-way valve of the air conditioner according to the outdoor ambient temperature of the air conditioner and the reversing pressure difference of the four-way valve of the air conditioner;

[0024] Figure 5 Structure diagram of an embodiment of the control device of the air conditioner of the present application;

[0025] Figure 6 Flow chart of an embodiment of the reversing control process of the four-way valve of the heat pump air conditioner during defrosting;

[0026] Figure 7 Flow chart of an embodiment of the self-adaptive control strategy of the reversing timing of the four-way valve of the heat pump air conditioner.

[0027] In combination with the accompanying drawings, the reference signs in the embodiments of the present application are as follows:

[0028] 102 - acquisition unit; 104 - control unit. DETAILED DESCRIPTION

[0029] To make the objectives, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described in detail below in combination with specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort fall within the scope of protection of the present application.

[0030] In the related solutions, the household heat pump air conditioner adopts a four-way valve to reverse circulation defrosting. The four-way valve has a piston and a slider. The four-way valve has a minimum pressure difference requirement when actually reversing. However, since the four-way valve mainly relies on the pressure at both ends of the piston to drive the slider to move, when the actual pressure difference at both ends of the piston in the four-way valve is greater than the minimum pressure difference of the four-way valve, the four-way valve will smoothly reverse to switch the refrigeration mode and the heating mode. Otherwise, when the actual pressure difference at both ends of the piston in the four-way valve is not greater than the minimum pressure difference of the four-way valve, the slider will be stuck in the middle position of the four-way valve during the reversing process of the four-way valve, and the four-way valve cannot smoothly reverse, so the refrigeration mode and the heating mode cannot be switched, and the "gas mixing" phenomenon occurs. The "gas mixing" phenomenon refers to the situation that the slider is stuck in the middle position of the four-way valve during the reversing process of the four-way valve.

[0031] In the process of reversing defrosting of the household heat pump air conditioner by using the four-way valve, the control logic in the related solutions is mostly determined according to the shutdown time of the compressor to determine the reversing time of the four-way valve. Since the pressure difference between the high-pressure side and the low-pressure side of the four-way valve is large at the reversing time, the pressure between the high-pressure side and the low-pressure side of the four-way valve is balanced instantaneously when the four-way valve switches the flow direction of the refrigerant, which will cause large reversing noise of the four-way valve. In addition, the impact force generated by the large reversing pressure difference of the four-way valve when reversing will not only damage the four-way valve and affect the reliability of the valve body of the four-way valve, but also cause problems such as shaking and swinging of the indoor unit and the pipe of the heat pump air conditioner, which are all caused by the large reversing pressure difference of the four-way valve.

[0032] Therefore, the scheme of the present application provides a control method of an air conditioner, specifically a control method of an air conditioner capable of reducing the reversing noise of the four-way valve during defrosting, which determines whether the four-way valve is reversed by judging whether the pressure difference value (i.e., the difference between the pressure values at the suction port and the discharge port of the compressor) of the compressor is within a preset pressure difference range when a defrosting signal of the heat pump air conditioner is received. When it is determined that the four-way valve is reversed, the appropriate power-off interval time of the four-way valve is selected according to the outdoor environment temperature of the heat pump air conditioner and the reversing pressure difference value of the four-way valve. The reversing timing of the four-way valve is adaptively adjusted according to the selected power-off interval time of the four-way valve, so as to minimize the reversing pressure difference of the four-way valve, such as the suction and discharge pressure difference value ΔP of the compressor when the four-way valve reverses, thereby reducing the reversing noise of the four-way valve, improving the comfort experience of the indoor user during defrosting, and solving the problem of large reversing noise caused by the large reversing pressure difference of the four-way valve.

[0033] According to the embodiments of the present application, a control method of an air conditioner is provided, as shown in Figure 1 The flowchart of an embodiment of the method of the present application is shown. The control method of the air conditioner can include steps S110 to S140.

[0034] At step S110, in the case that the air conditioner is running in a heating mode, an outdoor environment temperature of the air conditioner is acquired, and a reversing pressure difference of a four-way valve in the air conditioner is acquired. The outdoor environment temperature of the air conditioner is, for example, an outdoor environment temperature t of a heat pump air conditioner. out The reversing pressure difference of the four-way valve in the air conditioner, that is, a suction and discharge port pressure difference value of the compressor when the four-way valve reverses, is, for example, a suction and discharge port pressure difference value Δp of the compressor.

[0035] In some embodiments, the acquiring of the reversing pressure difference of the four-way valve in the air conditioner in step S110 includes any one of the following acquiring manners:

[0036] The first acquiring manner is an acquiring manner of determining the reversing pressure difference of the four-way valve according to the suction and discharge port pressure difference of the compressor.

[0037] The following will be described in combination with Figure 2 FIG. 2 shows an embodiment flowchart of the method of the present application for determining the reversing pressure difference of the four-way valve according to the suction and discharge port pressure difference of the compressor, which further illustrates the specific process of determining the reversing pressure difference of the four-way valve according to the suction and discharge port pressure difference of the compressor in step S110, including steps S210 to S220.

[0038] At step S210, an exhaust port pressure value of the compressor in the air conditioner is acquired, and an air inlet pressure value of the compressor in the air conditioner is acquired.

[0039] At step S220, in the case that a defrosting signal of the air conditioner is received, an absolute value of a difference between the exhaust port pressure value of the compressor in the air conditioner and the air inlet pressure value of the compressor in the air conditioner is taken as the reversing pressure difference of the four-way valve in the air conditioner.

[0040] The second acquiring manner is an acquiring manner of determining the reversing pressure difference of the four-way valve according to a temperature difference value of an outdoor heat exchanger coil.

[0041] The following will be described in combination with Figure 3 FIG. 3 shows an embodiment flowchart of the method of the present application for determining the reversing pressure difference of the four-way valve according to the temperature difference value of the outdoor heat exchanger coil, which further illustrates the specific process of determining the reversing pressure difference of the four-way valve according to the temperature difference value of the outdoor heat exchanger coil in step S110, including steps S310 to S330.

[0042] At step S310, a coil temperature of an indoor heat exchanger of the air conditioner is acquired, which is denoted as an indoor coil temperature of the air conditioner, and a coil temperature of an outdoor heat exchanger of the air conditioner is acquired, which is denoted as an outdoor coil temperature of the air conditioner.

[0043] Step S320, convert the indoor coil temperature of the air conditioner into a pressure value, denoted as a first pressure value; and convert the outdoor coil temperature of the air conditioner into a pressure value, denoted as a second pressure value.

[0044] Step S330, in the case of receiving the defrost signal of the air conditioner, the absolute value of the difference between the first pressure value and the second pressure value is taken as the reversing pressure difference of the four-way valve in the air conditioner.

[0045] Specifically, Figure 6 A flowchart of an embodiment of the reversing control process of the four-way valve of the heat pump air conditioner during defrosting. As shown in the figure, the reversing control process of the four-way valve of the heat pump air conditioner during defrosting includes: Figure 6

[0046] Step 11, in the case of the heat pump air conditioner operating in the heating mode, perform step 12.

[0047] Step 12, real-time monitor and record the outdoor environment temperature t out of the heat pump air conditioner, the discharge port pressure value p1 of the compressor, and the suction port pressure value p2 of the compressor, and then perform step 13.

[0048] Step 13, calculate the suction and discharge port pressure difference value Δp = |p1-p2| of the compressor. Of course, when determining the suction and discharge pressure difference value ΔP of the compressor, the indoor coil temperature and outdoor coil temperature values can also be used for judgment, and the coil temperature values are converted into pressure values to replace the reversing pressure difference of the four-way valve. Specifically, the values of the indoor coil temperature and outdoor coil temperature from the defrosting start time to the four-way valve reversing time under different working conditions are converted into pressure values, and then the pressure difference value is calculated to replace the reversing high and low pressure difference. Among them, because the reversing pressure difference of the four-way valve is not convenient to collect in actual test, the suction and discharge port pressure difference value of the compressor is usually used to approximate the replacement, that is, the reversing pressure difference is obtained in two ways: one is the direct calculation of the suction and discharge pressure difference of the compressor, and the other is the replacement according to the converted pressure difference of the indoor and outdoor coil temperature. For example: when the outdoor environment temperature is -5℃, the indoor coil temperature is -26℃, and the outdoor coil temperature is 12℃, the low pressure is 0.32MPa, the high pressure is 1.174MPa, and the reversing pressure difference is 0.854. This determination of the reversing pressure difference value will be a little smaller than the direct use of the compressor inlet and outlet pressure difference value, but it does not affect the overall size trend judgment of the reversing pressure difference of the four-way valve.

[0049] ​After calculating the compressor's suction and discharge port pressure difference Δp in step 13, upon receiving the defrost signal from the heat pump air conditioner, the optimal power-on / off interval time for the four-way valve is determined, thereby ensuring smooth reversing while reducing reversing noise. Specifically, by judging whether the compressor's suction and discharge port pressure difference Δp is within the preset reversing pressure difference range, it is determined whether the four-way valve should perform a reversing operation; simultaneously, based on the outdoor ambient temperature t... out Based on the magnitude of the pressure difference Δp between the compressor's suction and discharge ports, a suitable power-on / off interval T for the four-way valve is selected. This allows for adaptive adjustment of the four-way valve's switching sequence, thereby minimizing the switching pressure difference while ensuring normal switching operation. This reduces switching noise and improves user comfort during defrosting. The switching sequence refers to the time sequence of the four-way valve's power-off and power-on switching during defrosting. Specifically, it represents the interval between the power-off and power-on times and the two compressor shutdown times. The first compressor shutdown is the shutdown before defrosting (switching from heating to cooling), and the second compressor shutdown is the shutdown after defrosting (switching from cooling to heating).

[0050] In step S120, when the air conditioner is operating in heating mode and a defrost signal is received from the air conditioner, it is determined whether the reversing pressure difference of the four-way valve in the air conditioner is greater than or equal to a preset minimum pressure difference value and less than or equal to a preset maximum pressure difference value. The preset maximum pressure difference value is, for example, a preset pressure difference value of P, and the preset minimum pressure difference value is, for example, a preset pressure value of p3.

[0051] In step S130, if it is determined that the reversing pressure difference of the four-way valve in the air conditioner is greater than or equal to the preset minimum pressure difference and less than or equal to the preset maximum pressure difference, then it is determined that the four-way valve in the air conditioner needs to perform a reversing operation during defrosting.

[0052] In step S140, if it is determined that the four-way valve in the air conditioner needs to perform a reversing operation during defrosting, the reversing sequence of the four-way valve in the air conditioner is determined based on the outdoor ambient temperature of the air conditioner and the reversing pressure difference of the four-way valve in the air conditioner. That is, the reversing sequence of the four-way valve in the air conditioner during the defrosting operation is determined, so as to control the reversing operation of the four-way valve in the air conditioner during the defrosting operation according to the reversing sequence of the four-way valve in the air conditioner.

[0053] The control method of the air conditioner capable of reducing the defrosting reversing noise of the four-way valve provided by the scheme of the present application can reduce the reversing noise of the four-way valve by monitoring and recording the outdoor environment temperature, the pressure values of the suction port and the exhaust port of the compressor in real time, determining whether the pressure difference of the compressor inlet and outlet is within the preset pressure difference range when the defrosting signal is received, and determining whether the four-way valve is operated in the reversing mode; when it is determined that the four-way valve is operated in the reversing mode, the appropriate power-off interval time of the four-way valve is selected according to the outdoor environment temperature and the reversing pressure difference value, the reversing timing of the four-way valve is adaptively adjusted, and the reversing pressure difference of the four-way valve is minimized, such as the suction and exhaust pressure difference ΔP of the compressor during the reversing of the four-way valve, so as to reduce the reversing noise of the four-way valve and improve the comfort experience of the indoor user during the defrosting. Thus, the problem that the reversing noise of the four-way valve is large during the defrosting of the heat pump air conditioner and the indoor user experience is poor is solved.

[0054] In some embodiments, when it is determined in step S140 that the four-way valve in the air conditioner needs to be operated in the reversing mode during the defrosting, the specific process of determining the reversing timing of the four-way valve in the air conditioner according to the outdoor environment temperature of the air conditioner and the reversing pressure difference of the four-way valve in the air conditioner is determined, as described in the following example.

[0055] The following Figure 4 The following

[0056] Step S410, determining the current pressure difference interval to which the reversing pressure difference of the four-way valve in the air conditioner belongs in the set pressure difference range.

[0057] Step S420, determining the current temperature interval to which the outdoor environment temperature of the air conditioner belongs in the set temperature range under the current pressure difference interval to which the reversing pressure difference of the four-way valve in the air conditioner belongs in the set pressure difference range.

[0058] Step S430, determining the power-off interval time of the four-way valve in the air conditioner under the current temperature interval to which the outdoor environment temperature of the air conditioner belongs in the set temperature range.

[0059] Step S440, determining the reversing timing of the four-way valve in the air conditioner according to the power-off interval time of the four-way valve in the air conditioner.

[0060] Specifically, Figure 7A flowchart of an embodiment of the adaptive control strategy for reversing sequence of four-way valve in heat pump air conditioner. As shown in Figure 7 the adaptive control strategy for reversing sequence of four-way valve in heat pump air conditioner, comprising:

[0061] Step 21, in the case of heat pump air conditioner running in heating mode, detecting and recording real-time outdoor environment temperature t out , compressor discharge pressure value p1, and compressor suction pressure value p2, and then executing step 22.

[0062] Step 22, assuming the compressor suction and discharge pressure difference ΔP = |p1-p2|, preset pressure difference value P, and preset pressure difference value P is any value in the pressure interval [1.0Mpa, 1.2Mpa], then executing step 23.

[0063] Step 23, after receiving the defrost signal of heat pump air conditioner, determining whether the relationship between the compressor suction and discharge pressure difference ΔP and the preset pressure difference value P satisfies ΔP≤P: if yes, executing step 24, otherwise returning to step 23 to continue waiting in step 23. Of course, if ΔP>P, it means that the pressure difference between the high and low pressure sides of the current four-way reversing valve is too large, and if the four-way valve reversing switching is performed, it will cause too large reversing noise, and the impact force generated will not only damage the four-way valve, affect the reliability of the valve body of the four-way valve, but also cause indoor unit and pipe shaking, swinging and other problems.

[0064] Step 24, if ΔP≤P is satisfied, it is determined that the four-way valve needs to perform reversing operation during defrosting period, and according to the outdoor environment temperature t out and the reversing pressure difference value Δp (i.e. the compressor suction and discharge pressure difference ΔP), the appropriate four-way valve drop interval time T during defrosting is determined, and the reversing sequence is adaptively adjusted.

[0065] In some embodiments, the set pressure difference range includes a first pressure difference interval and a second pressure difference interval.

[0066] Determining the current pressure difference interval to which the reversing pressure difference of the four-way valve in the air conditioner belongs in the set pressure difference range in step S410 includes any one of the following pressure difference determination cases:

[0067] The first pressure difference determination case: if the reversing pressure difference of the four-way valve in the air conditioner is greater than or equal to the first set pressure difference and less than or equal to the second set pressure difference, it is determined that the current pressure difference interval is the first pressure difference interval; the first set pressure difference is the preset minimum pressure difference value, and the second set pressure difference is less than or equal to the preset maximum pressure difference value. Wherein, the first set pressure difference is like a preset pressure value p3, and the second set pressure difference is like a preset pressure value p4.

[0068] The second differential pressure determination scenario: If the reversing differential pressure of the four-way valve in the air conditioner is greater than the second set differential pressure, then the current differential pressure range is determined to be the second differential pressure range.

[0069] Accordingly, the set temperature range includes: a first temperature range, a second temperature range, and a third temperature range.

[0070] In step S420, when the reversing pressure difference of the four-way valve in the air conditioner falls within the current pressure difference range of the set pressure difference range, the current temperature range of the outdoor ambient temperature of the air conditioner within the set temperature range is determined, including any of the following temperature determination scenarios:

[0071] The first temperature determination scenario: If the outdoor ambient temperature of the air conditioner is less than the first set temperature, and the reversing pressure difference of the four-way valve in the air conditioner is within the current pressure difference range of the set pressure difference range, then the current temperature range is determined to be the first temperature range; wherein, the first set temperature is such as the preset temperature value t1.

[0072] The second temperature determination scenario: If the reversing pressure difference of the four-way valve in the air conditioner is within the current pressure difference range of the set pressure difference range, and the outdoor ambient temperature of the air conditioner is greater than or equal to the first set temperature and less than or equal to the second set temperature, then the current temperature range is determined to be the second temperature range; wherein, the first set temperature is such as the preset temperature value t1, and the second set temperature is such as the preset temperature value t2.

[0073] The third temperature determination scenario: If the outdoor ambient temperature of the air conditioner is greater than the second set temperature within the current pressure difference interval of the four-way valve's reversing pressure difference within the set pressure difference range, then the current temperature interval is determined to be the third temperature interval. The second set temperature is, for example, the preset temperature value t2.

[0074] Specifically, such as Figure 7 As shown, the adaptive control strategy for the switching timing of the four-way valve in the heat pump air conditioner further includes: in step 24, based on the outdoor ambient temperature t of the heat pump air conditioner... out The appropriate de-energizing interval T of the four-way valve during defrosting is determined by the reversing pressure difference Δp (i.e., the pressure difference between the compressor's suction and discharge ΔP), and the reversing sequence is adaptively adjusted. The specific judgment steps are as follows:

[0075] Step 241: When the reversing pressure difference ΔP < preset pressure value p3, it indicates that the reversing pressure difference is small and not within the normal reversing range of the four-way valve. This can easily lead to "air leakage" or reliability problems. It is not recommended to perform a reversing operation at this time.

[0076] Step 242, when the preset pressure value p3 < the reversing pressure difference ΔP < the preset pressure value p4 or the preset pressure value p4 < the reversing pressure difference ΔP is met, the outdoor environment temperature t of the air conditioner can be further determined according to the outdoor environment temperature t out Different, the different four-way valve interval time T is selected, the reversing timing of the four-way valve is adaptively adjusted: when the outdoor environment temperature t out When the outdoor environment temperature t is relatively low, the suction and discharge pressure difference value ΔP of the compressor during the reversing of the four-way valve is relatively large, the relatively long four-way valve interval time T can be adaptively selected to reduce the reversing noise under the condition of ensuring smooth reversing; when the outdoor environment temperature t out When the outdoor environment temperature t is relatively high, the suction and discharge pressure difference value ΔP of the compressor during the reversing of the four-way valve is relatively reduced, the relatively short four-way valve interval time T can be adaptively selected to reduce the reversing noise under the condition of ensuring smooth reversing.

[0077] In some embodiments, in step S430, the interval time of the four-way valve in the air conditioner is determined under the current temperature interval to which the outdoor environment temperature of the air conditioner belongs in the set temperature range, including any one of the following time determination cases:

[0078] The first time determination case: in the first pressure difference interval, if the current temperature interval is the first temperature interval, the interval time of the four-way valve is determined as the first set time. The first set time is, for example, the interval time T2 of the four-way valve.

[0079] The second time determination case: in the first pressure difference interval, if the current temperature interval is the second temperature interval, the interval time of the four-way valve is determined as the second set time. The second set time is, for example, the interval time T4 of the four-way valve.

[0080] The third time determination case: in the first pressure difference interval, if the current temperature interval is the third temperature interval, the interval time of the four-way valve is determined as the third set time. The third set time is, for example, the interval time T6 of the four-way valve.

[0081] The fourth time determination case: in the second pressure difference interval, if the current temperature interval is the first temperature interval, the interval time of the four-way valve is determined as the fourth set time. The fourth set time is, for example, the interval time T1 of the four-way valve.

[0082] The fifth time determination case: in the second pressure difference interval, if the current temperature interval is the second temperature interval, the interval time of the four-way valve is determined as the fifth set time. The fifth set time is, for example, the interval time T3 of the four-way valve.

[0083] The sixth time determination case: under the second pressure difference interval, if the current temperature interval is the third temperature interval, the drop interval time of the four-way valve is determined as the sixth set time. The sixth set time is the drop interval time T5 of the four-way valve.

[0084] The fourth set time is greater than the first set time, the fifth set time is greater than the second set time, and the sixth set time is greater than the third set time.

[0085] Specifically, as shown in Figure 7 The reversing time sequence adaptive control strategy of the four-way valve in the heat pump air conditioner further includes: in step 24, if ΔP≤P is met, it is determined that the reversing operation of the four-way valve during the defrosting period is needed, and the reversing time sequence control table of the four-way valve during the defrosting period is entered. The reversing time sequence control table of the four-way valve during the defrosting period can refer to the example shown in Table 1, to determine the appropriate drop interval time T of the four-way valve during the defrosting period according to the outdoor environment temperature t out and the reversing pressure difference value Δp (i.e. the suction and discharge pressure difference value ΔP of the compressor), and to adaptively adjust the reversing time sequence. For example, when the defrosting signal is contacted, the compressor is first stopped, the four-way valve is powered off after a period of time, then the compressor is started again to defrost, the compressor is stopped again after defrosting, the four-way valve is powered on after a period of time, and then the compressor is started again to start heating. Here, the reversing time sequence is adjusted, that is, the drop interval time T of the four-way valve is adjusted.

[0086] Table 1: Reversing time sequence control table of four-way valve during defrosting period

[0087] ΔP < p3 p3 < ΔP < p4 p4 < ΔP t out <t1]]> × T2 T1 [t1≤t out ≤t2]]> × T4 T3 [t2 < t out ]] × T6 T5

[0088] In Table 1, the preset temperature value t1 is generally selected as -5℃, and the preset temperature value t2 is generally selected as 5℃. The preset pressure value p3 is any value in the pressure interval [0.4Mpa, 0.8Mpa], and the preset pressure value p4 is any value in the pressure interval [0.8Mpa, 1.2Mpa]. × indicates that the reversing pressure difference is too small to easily cause “gas mixing” phenomenon, and the reversing operation is not performed. The drop interval time T1, T2 of the four-way valve is any value in the time interval [35s, 45s], and T1>T2; the drop interval time T3, T4 of the four-way valve is any value in the time interval [25s, 35s], and T3>T4; and the drop interval time T5, T6 of the four-way valve is any value in the time interval [15s, 25s], and T5>T6.

[0089] Specifically, as shown in Table 1, the outdoor environment temperature t outWhen the temperature t is less than the preset temperature t1, if the suction and discharge pressure difference ΔP of the compressor is less than the preset pressure value p3, the four-way valve does not perform the reversing action; if the suction and discharge pressure difference ΔP of the compressor is greater than or equal to the preset pressure value p3 and less than or equal to the preset pressure value p4, the four-way valve performs the reversing action, and the power-off interval time T of the four-way valve is the preset power-off interval time T2; if the suction and discharge pressure difference ΔP of the compressor is greater than the preset pressure value p4, the four-way valve performs the reversing action, and the power-off interval time T of the four-way valve is the preset power-off interval time T1.

[0090] As shown in Table 1, when the outdoor environment temperature t of the heat pump air conditioner is greater than or equal to the preset temperature t1 and less than or equal to the preset temperature t2, if the suction and discharge pressure difference ΔP of the compressor is less than the preset pressure value p3, the four-way valve does not perform the reversing action; if the suction and discharge pressure difference ΔP of the compressor is greater than or equal to the preset pressure value p3 and less than or equal to the preset pressure value p4, the four-way valve performs the reversing action, and the power-off interval time T of the four-way valve is the preset power-off interval time T4; if the suction and discharge pressure difference ΔP of the compressor is greater than the preset pressure value p4, the four-way valve performs the reversing action, and the power-off interval time T of the four-way valve is the preset power-off interval time T3. out As shown in Table 1, when the outdoor environment temperature t of the heat pump air conditioner is greater than or equal to the preset temperature t1 and less than or equal to the preset temperature t2, if the suction and discharge pressure difference ΔP of the compressor is less than the preset pressure value p3, the four-way valve does not perform the reversing action; if the suction and discharge pressure difference ΔP of the compressor is greater than or equal to the preset pressure value p3 and less than or equal to the preset pressure value p4, the four-way valve performs the reversing action, and the power-off interval time T of the four-way valve is the preset power-off interval time T4; if the suction and discharge pressure difference ΔP of the compressor is greater than the preset pressure value p4, the four-way valve performs the reversing action, and the power-off interval time T of the four-way valve is the preset power-off interval time T3.

[0091] As shown in Table 1, when the outdoor environment temperature t of the heat pump air conditioner is greater than or equal to the preset temperature t1 and less than or equal to the preset temperature t2, if the suction and discharge pressure difference ΔP of the compressor is less than the preset pressure value p3, the four-way valve does not perform the reversing action; if the suction and discharge pressure difference ΔP of the compressor is greater than or equal to the preset pressure value p3 and less than or equal to the preset pressure value p4, the four-way valve performs the reversing action, and the power-off interval time T of the four-way valve is the preset power-off interval time T4; if the suction and discharge pressure difference ΔP of the compressor is greater than the preset pressure value p4, the four-way valve performs the reversing action, and the power-off interval time T of the four-way valve is the preset power-off interval time T3. out As shown in Table 1, when the outdoor environment temperature t of the heat pump air conditioner is greater than or equal to the preset temperature t1 and less than or equal to the preset temperature t2, if the suction and discharge pressure difference ΔP of the compressor is less than the preset pressure value p3, the four-way valve does not perform the reversing action; if the suction and discharge pressure difference ΔP of the compressor is greater than or equal to the preset pressure value p3 and less than or equal to the preset pressure value p4, the four-way valve performs the reversing action, and the power-off interval time T of the four-way valve is the preset power-off interval time T4; if the suction and discharge pressure difference ΔP of the compressor is greater than the preset pressure value p4, the four-way valve performs the reversing action, and the power-off interval time T of the four-way valve is the preset power-off interval time T3.

[0092] For example, when the reversing pressure difference is 0.6 MPa, the outdoor environment temperature t is -7℃, the power-off interval time T of the four-way valve is 40 s, the outdoor environment temperature t is 0℃, the power-off interval time T of the four-way valve is 30 s, and the outdoor environment temperature t is 7℃, the power-off interval time T of the four-way valve is 20 s. out For example, when the reversing pressure difference is 0.6 MPa, the outdoor environment temperature t is -7℃, the power-off interval time T of the four-way valve is 40 s, the outdoor environment temperature t is 0℃, the power-off interval time T of the four-way valve is 30 s, and the outdoor environment temperature t is 7℃, the power-off interval time T of the four-way valve is 20 s. out For example, when the reversing pressure difference is 0.6 MPa, the outdoor environment temperature t is -7℃, the power-off interval time T of the four-way valve is 40 s, the outdoor environment temperature t is 0℃, the power-off interval time T of the four-way valve is 30 s, and the outdoor environment temperature t is 7℃, the power-off interval time T of the four-way valve is 20 s. outWhen the outdoor environment temperature t is 7℃, the drop interval time T of the four-way valve is 20s. By adaptively adjusting the switching timing of the four-way valve, the air suction and discharge pressure difference ΔP of the compressor during the switching of the four-way valve is minimized under the condition that the four-way valve can normally switch, so as to reduce the switching noise of the four-way valve, avoid the impact force caused by the excessive switching pressure difference from damaging the four-way valve, affect the reliability of the valve body of the four-way valve, and cause problems such as shaking and swinging of the indoor unit and the pipeline, and improve the user experience.

[0093] The technical scheme of the embodiment is adopted, in the case that the air conditioner (such as a heat pump air conditioner) is in heating operation, if a defrosting signal is received, the heat pump air conditioner is controlled to enter a defrosting period; during the defrosting period, whether the four-way valve needs to switch is determined according to the suction and discharge port pressure difference of the compressor in the heat pump air conditioner, in the case that it is determined that the four-way valve needs to switch, the drop interval time of the four-way valve is determined according to the outdoor environment temperature and the suction and discharge port pressure difference of the compressor, and the switching timing of the four-way valve is adjusted according to the drop interval time of the four-way valve, so that, by adjusting the switching timing of the four-way valve according to the outdoor environment temperature and the switching pressure difference of the four-way valve during the defrosting period, the switching noise of the four-way valve can be reduced, and the user experience can be improved.

[0094] According to the embodiment of the present application, a control device of an air conditioner corresponding to the control method of the air conditioner is also provided. Referring to Figure 5 the structural schematic diagram of an embodiment of the device of the present application. The control device of the air conditioner can include: an acquisition unit 102 and an acquisition unit 102.

[0095] The acquisition unit 102 is configured to acquire the outdoor environment temperature of the air conditioner and acquire the switching pressure difference of the four-way valve in the air conditioner in the case that the air conditioner is in heating mode. The outdoor environment temperature of the air conditioner, such as the outdoor environment temperature t of the heat pump air conditioner, is acquired. out The switching pressure difference of the four-way valve in the air conditioner, that is, the suction and discharge port pressure difference of the compressor during the switching of the four-way valve, such as the suction and discharge port pressure difference Δp of the compressor. The specific functions and processes of the acquisition unit 102 are described in step S110.

[0096] In some embodiments, the acquisition unit 102 acquires the switching pressure difference of the four-way valve in the air conditioner, including any one of the following acquisition methods:

[0097] The first acquisition method: the acquisition unit 102 is specifically further configured to acquire the switching pressure difference of the four-way valve according to the suction and discharge port pressure difference of the compressor, and specifically as follows:

[0098] The acquisition unit 102 is specifically further configured to acquire the discharge port pressure value of the compressor in the air conditioner and acquire the suction port pressure value of the compressor in the air conditioner; the specific functions and processes of the acquisition unit 102 are also described with reference to step S210.

[0099] The acquisition unit 102 is specifically further configured to, in the case of receiving the defrosting signal of the air conditioner, take the absolute value of the difference between the discharge port pressure value of the compressor in the air conditioner and the suction port pressure value of the compressor in the air conditioner as the reversing pressure difference of the four-way valve in the air conditioner; the specific functions and processes of the acquisition unit 102 are also described with reference to step S22.

[0100] The second acquisition mode is that the acquisition unit 102 is specifically further configured to determine the reversing pressure difference of the four-way valve according to the temperature difference of the outdoor heat exchanger coil, specifically as follows:

[0101] The acquisition unit 102 is specifically further configured to acquire the coil temperature of the indoor heat exchanger of the air conditioner, denoted as the indoor coil temperature of the air conditioner, and acquire the coil temperature of the outdoor heat exchanger of the air conditioner, denoted as the outdoor coil temperature of the air conditioner; the specific functions and processes of the acquisition unit 102 are also described with reference to step S310.

[0102] The acquisition unit 102 is specifically further configured to convert the indoor coil temperature of the air conditioner into a pressure value, denoted as a first pressure value, and convert the outdoor coil temperature of the air conditioner into a pressure value, denoted as a second pressure value; the specific functions and processes of the acquisition unit 102 are also described with reference to step S320.

[0103] The acquisition unit 102 is specifically further configured to, in the case of receiving the defrosting signal of the air conditioner, take the absolute value of the difference between the first pressure value and the second pressure value as the reversing pressure difference of the four-way valve in the air conditioner. The specific functions and processes of the acquisition unit 102 are also described with reference to step S330.

[0104] Specifically, Figure 6 An embodiment of the flowchart of the reversing control process of the four-way valve of the heat pump air conditioner during defrosting is shown in FIG. 2. Figure 6 As shown in FIG. 2, the reversing control process of the four-way valve of the heat pump air conditioner during defrosting includes the following steps.

[0105] Step 11, in the case of the heat pump air conditioner operating in the heating mode, step 12 is performed.

[0106] Step 12, the outdoor environment temperature t of the heat pump air conditioner, the discharge port pressure value p1 of the compressor, and the suction port pressure value p2 of the compressor are monitored and recorded in real time, and then step 13 is performed. out ​

[0107] Step 13, calculate the suction and discharge port pressure difference value of the compressor Δp = |p1-p2|. Of course, when determining the suction and discharge pressure difference value ΔP of the compressor, the indoor coil temperature, outdoor coil temperature value can also be used for judgment, and the coil temperature value is converted into a pressure value to replace the four-way valve switching pressure difference. Specifically, the indoor coil temperature and outdoor coil temperature values from the defrosting start time to the four-way valve switching time under different working conditions are converted into pressure values, and then the pressure difference value is calculated to replace the switching high and low pressure difference.

[0108] After calculating the suction and discharge port pressure difference value Δp of the compressor in step 13, when receiving the defrosting signal of the heat pump air conditioner, the optimal power-off interval time of the four-way valve is determined, and then the switching noise is reduced while ensuring smooth switching. Specifically, whether the suction and discharge port pressure difference value Δp of the compressor is within the preset switching pressure difference range is determined to determine whether the four-way valve needs to be switched; at the same time, according to the outdoor environment temperature t out and the size of the suction and discharge port pressure difference value Δp of the compressor, the appropriate power-off interval time T of the four-way valve is selected, so that the switching timing of the four-way valve is adaptively adjusted according to the selected power-off interval time T of the four-way valve, so that the switching pressure difference of the four-way valve is minimized under the condition that the four-way valve can be normally switched, thereby reducing the switching noise of the four-way valve and improving the comfort experience of the indoor user during defrosting. The switching timing of the four-way valve refers to the time sequence of the two switching of the power-off and power-on of the four-way valve during defrosting, which refers to the interval time between the power-off time and the power-on time of the four-way valve and the two compressor stop times, wherein the first compressor stop is the stop of heating to cooling (i.e. the stop before defrosting), and the second compressor stop is the stop of cooling to heating (i.e. the stop after defrosting).

[0109] The control unit 104 is configured to, in the case that the air conditioner is running in the heating mode, determine whether the switching pressure difference of the four-way valve in the air conditioner is greater than or equal to a preset minimum pressure difference value and less than or equal to a preset maximum pressure difference value when receiving the defrosting signal of the air conditioner. Wherein, the preset maximum pressure difference value is P, and the preset minimum pressure difference value is p3. The specific functions and processes of the control unit 104 are described in step S120.

[0110] The control unit 104 is further configured to determine that the four-way valve in the air conditioner needs to perform switching operation during defrosting if it is determined that the switching pressure difference of the four-way valve in the air conditioner is greater than or equal to the preset minimum pressure difference value and less than or equal to the preset maximum pressure difference value. The specific functions and processes of the control unit 104 are also described in step S130.

[0111] The control unit 104 is further configured to, in a case where it is determined that the reversing operation of the four-way valve in the air conditioner during the defrosting is required, determine the reversing timing of the four-way valve in the air conditioner according to the outdoor ambient temperature of the air conditioner and the reversing pressure difference of the four-way valve in the air conditioner, i.e., determine the reversing timing of the four-way valve in the air conditioner during the defrosting, so as to control the reversing operation of the four-way valve in the air conditioner during the defrosting according to the reversing timing of the four-way valve in the air conditioner. The specific functions and processes of the control unit 104 will also be described with reference to step S140.

[0112] The control device of the air conditioner for reducing the reversing noise of the four-way valve during defrosting provided by the scheme of the present application can monitor and record the outdoor ambient temperature, the pressure values of the suction port and the exhaust port of the compressor in real time, determine whether the reversing operation of the four-way valve is required by judging whether the pressure difference between the inlet and outlet of the compressor is within the preset pressure difference range when the defrosting signal is received, and determine the reversing interval time of the four-way valve according to the outdoor ambient temperature and the size of the reversing pressure difference when it is determined that the reversing operation of the four-way valve is required. The reversing timing of the four-way valve is adaptively adjusted, the reversing pressure difference of the four-way valve is minimized as much as possible under the condition that the four-way valve can normally reverse, for example, the suction and exhaust pressure difference ΔP of the compressor during the reversing of the four-way valve is minimized, so as to reduce the reversing noise of the four-way valve and improve the comfort experience of the indoor user during the defrosting. Thus, the problem that the reversing noise of the four-way valve during the defrosting of the heat pump air conditioner is large and causes poor indoor user experience is solved.

[0113] In some embodiments, the control unit 104, in a case where it is determined that the reversing operation of the four-way valve in the air conditioner during the defrosting is required, determines the reversing timing of the four-way valve in the air conditioner according to the outdoor ambient temperature of the air conditioner and the reversing pressure difference of the four-way valve in the air conditioner, comprises:

[0114] The control unit 104 is further configured to determine the current pressure difference interval to which the reversing pressure difference of the four-way valve in the air conditioner belongs in the set pressure difference range. The specific functions and processes of the control unit 104 will also be described with reference to step S410.

[0115] The control unit 104 is further configured to, in a case where the reversing pressure difference of the four-way valve in the air conditioner belongs to the current pressure difference interval in the set pressure difference range, determine the current temperature interval to which the outdoor ambient temperature of the air conditioner belongs in the set temperature range. The specific functions and processes of the control unit 104 will also be described with reference to step S420.

[0116] The control unit 104 is further configured to, in a case where the outdoor ambient temperature of the air conditioner belongs to the current temperature interval in the set temperature range, determine the reversing interval time of the four-way valve in the air conditioner. The specific functions and processes of the control unit 104 will also be described with reference to step S430.

[0117] The control unit 104 is further configured to determine the reversing timing of the four-way valve in the air conditioner according to the power-off interval time of the four-way valve in the air conditioner. The specific functions and processes of the control unit 104 are also described in step S440.

[0118] Specifically, Figure 7 A flowchart of an embodiment of the adaptive control strategy for the reversing timing of the four-way valve in the heat pump air conditioner. As shown in the figure, Figure 7 The adaptive control strategy for the reversing timing of the four-way valve in the heat pump air conditioner includes:

[0119] Step 21, in the case where the heat pump air conditioner is running in the heating mode, detecting and recording in real time the current outdoor environment temperature t out of the heat pump air conditioner, the discharge port pressure value p1 of the compressor, and the suction port pressure value p2 of the compressor, and then performing step 22.

[0120] Step 22, assuming that the suction and discharge pressure difference ΔP of the compressor is |p1-p2|, a preset pressure difference value P is set, and the preset pressure difference value P is any value in the pressure interval [1.0 Mpa, 1.2 Mpa], and then performing step 23.

[0121] Step 23, after receiving the defrost signal of the heat pump air conditioner, determining whether the relationship between the suction and discharge pressure difference ΔP of the compressor and the preset pressure difference value P satisfies ΔP≤P: if yes, performing step 24, otherwise returning to step 23 to continue waiting in step 23. Of course, if ΔP>P, it means that the pressure difference between the high and low pressure sides of the current four-way reversing valve is too large, and if the four-way valve reversing switching is performed, it will cause too large reversing noise, and the impact force generated will not only damage the four-way valve, affect the reliability of the valve body of the four-way valve, but also cause problems such as indoor unit and pipe shaking, swinging, etc.

[0122] Step 24, if ΔP≤P is satisfied, it is determined that the reversing operation of the four-way valve during the defrosting period is needed, and the appropriate power-off interval time T of the four-way valve during the defrosting period is determined according to the outdoor environment temperature t out of the heat pump air conditioner and the reversing pressure difference value Δp (i.e. the suction and discharge pressure difference ΔP of the compressor), and the reversing timing is adaptively adjusted.

[0123] In some embodiments, the set pressure difference range includes a first pressure difference interval and a second pressure difference interval.

[0124] The control unit 104 determines the current pressure difference interval to which the reversing pressure difference of the four-way valve in the air conditioner belongs in the set pressure difference range, including any one of the following pressure difference determination cases:

[0125] The first pressure difference determination case: the control unit 104 is specifically further configured to determine that the current pressure difference interval is the first pressure difference interval if the reversing pressure difference of the four-way valve in the air conditioner is greater than or equal to a first set pressure difference and less than or equal to a second set pressure difference; the first set pressure difference is the preset minimum pressure difference value, and the second set pressure difference is less than or equal to the preset maximum pressure difference value. The first set pressure difference is, for example, a preset pressure value p3, and the second set pressure difference is, for example, a preset pressure value p4.

[0126] The second pressure difference determination case: the control unit 104 is specifically further configured to determine that the current pressure difference interval is the second pressure difference interval if the reversing pressure difference of the four-way valve in the air conditioner is greater than the second set pressure difference.

[0127] Correspondingly, the set temperature range includes a first temperature interval, a second temperature interval and a third temperature interval.

[0128] The control unit 104 determines, under the current pressure difference interval to which the reversing pressure difference of the four-way valve in the air conditioner belongs in the set pressure difference range, a current temperature interval to which the outdoor environment temperature of the air conditioner belongs in the set temperature range, including any one of the following temperature determination cases:

[0129] The first temperature determination case: the control unit 104 is specifically further configured to determine that the current temperature interval is the first temperature interval if the outdoor environment temperature of the air conditioner is less than a first set temperature under the current pressure difference interval to which the reversing pressure difference of the four-way valve in the air conditioner belongs in the set pressure difference range. The first set temperature is, for example, a preset temperature value t1.

[0130] The second temperature determination case: the control unit 104 is specifically further configured to determine that the current temperature interval is the second temperature interval if the outdoor environment temperature of the air conditioner is greater than or equal to the first set temperature and less than or equal to a second set temperature under the current pressure difference interval to which the reversing pressure difference of the four-way valve in the air conditioner belongs in the set pressure difference range. The first set temperature is, for example, a preset temperature value t1, and the second set temperature is, for example, a preset temperature value t2.

[0131] The third temperature determination case: the control unit 104 is specifically further configured to determine that the current temperature interval is the third temperature interval if the outdoor environment temperature of the air conditioner is greater than the second set temperature under the current pressure difference interval to which the reversing pressure difference of the four-way valve in the air conditioner belongs in the set pressure difference range. The second set temperature is, for example, a preset temperature value t2.

[0132] Specifically, as Figure 7As shown, the reversing timing adaptive control strategy of the four-way valve in the heat pump air conditioner further includes: in step 24, determining the appropriate off-interval time T of the four-way valve during defrosting according to the outdoor environment temperature t out and the reversing pressure difference value Δp (i.e., the suction and discharge pressure difference value ΔP of the compressor) to adaptively adjust the reversing timing, and the specific judgment steps are as follows:

[0133] Step 241: When the reversing pressure difference ΔP < the preset pressure value p3, it indicates that the reversing pressure difference is small at this time, which is not within the normal reversing range of the four-way valve, and "gas mixing" phenomenon or reliability problems are prone to occur, so it is not recommended to perform reversing operation at this time.

[0134] Step 242: When the preset pressure value p3 < the reversing pressure difference ΔP < the preset pressure value p4 or the preset pressure value p4 < the reversing pressure difference ΔP, the outdoor environment temperature t out is different, the off-interval time T of the four-way valve is selected to adaptively adjust the reversing timing of the four-way valve: when the outdoor environment temperature t out is relatively low, the suction and discharge pressure difference value ΔP of the compressor during reversing of the four-way valve is relatively large, a relatively long off-interval time T of the four-way valve can be adaptively selected to reduce reversing noise while ensuring smooth reversing; when the outdoor environment temperature t out is relatively high, the suction and discharge pressure difference value ΔP of the compressor during reversing of the four-way valve is relatively small, a relatively short off-interval time T of the four-way valve can be adaptively selected to reduce reversing noise while ensuring smooth reversing.

[0135] In some embodiments, the control unit 104 determines the off-interval time of the four-way valve in the air conditioner under the current temperature interval to which the outdoor environment temperature of the air conditioner belongs in a set temperature range, including any one of the following time determination cases:

[0136] The first time determination case: the control unit 104 is specifically further configured to, under the first pressure difference interval, if the current temperature interval is the first temperature interval, determine the off-interval time of the four-way valve as a first set time. The first set time is, for example, the off-interval time T2 of the four-way valve.

[0137] The second time determination case: the control unit 104 is specifically further configured to, under the first pressure difference interval, if the current temperature interval is the second temperature interval, determine the off-interval time of the four-way valve as a second set time. The second set time is, for example, the off-interval time T4 of the four-way valve.

[0138] The third time determination scenario: Specifically, the control unit 104 is further configured to, within the first differential pressure range, if the current temperature range is the third temperature range, determine the power-off interval time of the four-way valve as a third set time. The third set time is, for example, the power-off interval time T6 of the four-way valve.

[0139] The fourth time determination scenario: Specifically, the control unit 104 is further configured to, under the second differential pressure range, if the current temperature range is the first temperature range, determine the power-off interval time of the four-way valve as a fourth set time. The fourth set time is, for example, the power-off interval time T1 of the four-way valve.

[0140] The fifth time determination scenario: Specifically, the control unit 104 is further configured to, under the second differential pressure range, if the current temperature range is the second temperature range, determine the power-off interval time of the four-way valve as a fifth set time. The fifth set time is, for example, the power-off interval time T3 of the four-way valve.

[0141] The sixth time determination scenario: Specifically, the control unit 104 is further configured to, under the second differential pressure range, if the current temperature range is the third temperature range, determine the power-off interval time of the four-way valve as a sixth set time. The sixth set time is, for example, the power-off interval time T5 of the four-way valve.

[0142] Wherein, the fourth set time is greater than the first set time, the fifth set time is greater than the second set time, and the sixth set time is greater than the third set time.

[0143] Specifically, such as Figure 7 As shown, the adaptive control strategy for the switching timing of the four-way valve in the heat pump air conditioner further includes: in step 24, if ΔP≤P, then it is determined that the four-way valve needs to perform a switching operation during defrosting, and the switching timing control table for the four-way valve during defrosting is entered. For a specific example of the switching timing control table for the four-way valve during defrosting, please refer to Table 1, which is based on the outdoor ambient temperature t of the heat pump air conditioner. out Based on the reversing pressure difference Δp (i.e., the difference between the compressor's suction and discharge pressures ΔP), determine the appropriate power-on / off interval T for the four-way valve during defrosting, and adaptively adjust the reversing sequence.

[0144] Table 1: Four-way valve reversing sequence control table during defrosting

[0145] ΔP < p3 p3 < ΔP < p4 p4 < ΔP t out <t1> × T2 T1 [t1≤t out ≤t2]]> × T4 T3 [t2 < t out ]] × T6 T5

[0146] In Table 1, the preset temperature value t1 is generally selected as -5℃, and the preset temperature value t2 is generally selected as 5℃. The preset pressure value p3 is any value in the pressure interval [0.4Mpa, 0.8Mpa], and the preset pressure value p4 is any value in the pressure interval [0.8Mpa, 1.2Mpa]. The symbol "X" indicates that the reversing pressure difference is too small to cause the "gas mixing" phenomenon, and the reversing operation is not performed. The on-off interval time T1, T2 of the four-way valve is any value in the time interval [35s, 45s], and T1>T2; the on-off interval time T3, T4 of the four-way valve is any value in the time interval [25s, 35s], and T3>T4; the on-off interval time T5, T6 of the four-way valve is any value in the time interval [15s, 25s], and T5>T6.

[0147] Specifically, as shown in Table 1, when the outdoor ambient temperature t of the heat pump air conditioner is less than the preset temperature t1, if the suction-discharge pressure difference ΔP of the compressor (i.e., the suction-discharge pressure difference ΔP of the compressor) is less than the preset pressure value p3, the four-way valve does not perform the reversing operation; if the suction-discharge pressure difference ΔP of the compressor is greater than or equal to the preset pressure value p3 and less than or equal to the preset pressure value p4, the four-way valve performs the reversing operation, and the on-off interval time T of the four-way valve is the preset on-off interval time T2; if the suction-discharge pressure difference ΔP of the compressor is greater than the preset pressure value p4, the four-way valve performs the reversing operation, and the on-off interval time T of the four-way valve is the preset on-off interval time T1. out Specifically, as shown in Table 1, when the outdoor ambient temperature t of the heat pump air conditioner is less than the preset temperature t1, if the suction-discharge pressure difference ΔP of the compressor (i.e., the suction-discharge pressure difference ΔP of the compressor) is less than the preset pressure value p3, the four-way valve does not perform the reversing operation; if the suction-discharge pressure difference ΔP of the compressor is greater than or equal to the preset pressure value p3 and less than or equal to the preset pressure value p4, the four-way valve performs the reversing operation, and the on-off interval time T of the four-way valve is the preset on-off interval time T2; if the suction-discharge pressure difference ΔP of the compressor is greater than the preset pressure value p4, the four-way valve performs the reversing operation, and the on-off interval time T of the four-way valve is the preset on-off interval time T1.

[0148] Specifically, as shown in Table 1, when the outdoor ambient temperature t of the heat pump air conditioner is less than the preset temperature t1, if the suction-discharge pressure difference ΔP of the compressor (i.e., the suction-discharge pressure difference ΔP of the compressor) is less than the preset pressure value p3, the four-way valve does not perform the reversing operation; if the suction-discharge pressure difference ΔP of the compressor is greater than or equal to the preset pressure value p3 and less than or equal to the preset pressure value p4, the four-way valve performs the reversing operation, and the on-off interval time T of the four-way valve is the preset on-off interval time T2; if the suction-discharge pressure difference ΔP of the compressor is greater than the preset pressure value p4, the four-way valve performs the reversing operation, and the on-off interval time T of the four-way valve is the preset on-off interval time T1. out Specifically, as shown in Table 1, when the outdoor ambient temperature t of the heat pump air conditioner is less than the preset temperature t1, if the suction-discharge pressure difference ΔP of the compressor (i.e., the suction-discharge pressure difference ΔP of the compressor) is less than the preset pressure value p3, the four-way valve does not perform the reversing operation; if the suction-discharge pressure difference ΔP of the compressor is greater than or equal to the preset pressure value p3 and less than or equal to the preset pressure value p4, the four-way valve performs the reversing operation, and the on-off interval time T of the four-way valve is the preset on-off interval time T2; if the suction-discharge pressure difference ΔP of the compressor is greater than the preset pressure value p4, the four-way valve performs the reversing operation, and the on-off interval time T of the four-way valve is the preset on-off interval time T1.

[0149] Specifically, as shown in Table 1, when the outdoor ambient temperature t of the heat pump air conditioner is less than the preset temperature t1, if the suction-discharge pressure difference ΔP of the compressor (i.e., the suction-discharge pressure difference ΔP of the compressor) is less than the preset pressure value p3, the four-way valve does not perform the reversing operation; if the suction-discharge pressure difference ΔP of the compressor is greater than or equal to the preset pressure value p3 and less than or equal to the preset pressure value p4, the four-way valve performs the reversing operation, and the on-off interval time T of the four-way valve is the preset on-off interval time T2; if the suction-discharge pressure difference ΔP of the compressor is greater than the preset pressure value p4, the four-way valve performs the reversing operation, and the on-off interval time T of the four-way valve is the preset on-off interval time T1. outWhen the temperature is greater than the preset temperature t2, if the suction and discharge pressure difference ΔP of the compressor is less than a preset pressure value p3, the four-way valve does not perform the reversing action; if the suction and discharge pressure difference ΔP of the compressor is greater than or equal to the preset pressure value p3 and less than or equal to a preset pressure value p4, the four-way valve performs the reversing action, and the drop interval time T of the four-way valve is a preset drop interval time T6; if the suction and discharge pressure difference ΔP of the compressor is greater than the preset pressure value p4, the four-way valve performs the reversing action, and the drop interval time T of the four-way valve is a preset drop interval time T5.

[0150] For example, when the reversing pressure difference is 0.6 MPa, the outdoor environment temperature t is-7 ℃, the drop interval time T of the four-way valve is 40 s, the outdoor environment temperature t is 0 ℃, the drop interval time T of the four-way valve is 30 s, and the outdoor environment temperature t is 7 ℃, the drop interval time T of the four-way valve is 20 s. out For example, when the reversing pressure difference is 0.6 MPa, the outdoor environment temperature t out is-7 ℃, the drop interval time T of the four-way valve is 40 s, the outdoor environment temperature t out is 0 ℃, the drop interval time T of the four-way valve is 30 s, and the outdoor environment temperature t is 7 ℃, the drop interval time T of the four-way valve is 20 s. By adaptively adjusting the reversing timing of the four-way valve, the suction and discharge pressure difference ΔP of the compressor during the reversing of the four-way valve is minimized under the condition that the four-way valve can normally reverse, thereby reducing the reversing noise of the four-way valve, avoiding the impact force caused by the excessively large reversing pressure difference from damaging the four-way valve, affecting the reliability of the valve body of the four-way valve, and causing problems such as indoor unit and pipe shaking and swinging, and improving the user experience.

[0151] Since the processing and functions realized by the device of the embodiment are basically corresponding to the embodiments, principles and examples of the foregoing method, details not described in the description of the embodiment can be referred to the related description in the foregoing embodiments, which will not be repeated here.

[0152] By using the technical solution of the application, in the case of heating operation of the air conditioner (such as a heat pump air conditioner), if a defrosting signal is received, the heat pump air conditioner is controlled to enter a defrosting period; during the defrosting period, it is determined whether the four-way valve needs to reverse according to the suction and discharge port pressure difference of the compressor in the heat pump air conditioner, the drop interval time of the four-way valve is determined according to the outdoor environment temperature and the suction and discharge port pressure difference of the compressor in the case of determining that the four-way valve needs to reverse, the reversing timing of the four-way valve is adjusted according to the drop interval time of the four-way valve, the reversing noise of the four-way valve is reduced, the impact force caused by the excessively large reversing pressure difference is avoided to damage the four-way valve, the reliability of the valve body of the four-way valve is affected, and problems such as indoor unit and pipe shaking and swinging are caused, and the user experience is improved.

[0153] According to the embodiment of the application, an air conditioner corresponding to the control device of the air conditioner is also provided. The air conditioner can include the control device of the air conditioner described above.

[0154] Since the processing and functions realized by the air conditioner of the embodiment are basically corresponding to the foregoing embodiments, principles and examples of the device, the description of the embodiment will not be elaborated on the related description in the foregoing embodiments, and will not be repeated here.

[0155] By the technical solution of the present application, in the case of heating operation of the air conditioner (such as a heat pump air conditioner), if a defrost signal is received, the heat pump air conditioner is controlled to enter a defrost period; during the defrost period, it is determined whether the four-way valve needs to be reversed according to the suction and discharge port pressure difference of the compressor in the heat pump air conditioner, in the case of determining that the four-way valve needs to be reversed, the drop interval time of the four-way valve is determined according to the outdoor environment temperature and the suction and discharge port pressure difference of the compressor, the reversing timing of the four-way valve is adjusted according to the drop interval time of the four-way valve, the reversing timing of the four-way valve is adaptively adjusted, the suction and discharge pressure difference ΔP of the compressor at the reversing time of the four-way valve is minimized in the case of ensuring that the four-way valve can be normally reversed, thereby reducing the reversing noise of the four-way valve and improving the user experience.

[0156] According to the embodiment of the present application, a storage medium corresponding to the control method of the air conditioner is also provided, the storage medium comprises a stored program, wherein when the program is running, the device where the storage medium is located performs the control method of the air conditioner described above.

[0157] Since the processing and functions realized by the storage medium of the embodiment are basically corresponding to the foregoing embodiments, principles and examples of the method, the description of the embodiment will not be elaborated on the related description in the foregoing embodiments, and will not be repeated here.

[0158] By the technical solution of the present application, in the case of heating operation of the air conditioner (such as a heat pump air conditioner), if a defrost signal is received, the heat pump air conditioner is controlled to enter a defrost period; during the defrost period, it is determined whether the four-way valve needs to be reversed according to the suction and discharge port pressure difference of the compressor in the heat pump air conditioner, in the case of determining that the four-way valve needs to be reversed, the drop interval time of the four-way valve is determined according to the outdoor environment temperature and the suction and discharge port pressure difference of the compressor, the reversing timing of the four-way valve is adjusted according to the drop interval time of the four-way valve, the reversing timing of the four-way valve is adaptively adjusted, the reversing pressure difference of the four-way valve is minimized in the case of ensuring that the four-way valve can be normally reversed, such as minimizing the suction and discharge pressure difference ΔP of the compressor at the reversing time of the four-way valve, thereby reducing the reversing noise of the four-way valve and improving the user experience.

[0159] In summary, the person skilled in the art can easily understand that the above-mentioned advantageous modes can be freely combined and superimposed without conflict.

[0160] The above merely illustrates the embodiments of the present application but should not be taken as limitations. Various changes and modifications can be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of claims of the present application.

Claims

1. A control method for an air conditioner, characterized in that, include: When the air conditioner is operating in heating mode, the outdoor ambient temperature of the air conditioner is obtained, and the reversing pressure difference of the four-way valve in the air conditioner is obtained; wherein, the reversing pressure difference of the four-way valve in the air conditioner is the pressure difference between the suction and discharge ports of the compressor in the air conditioner when the four-way valve in the air conditioner reverses. Upon receiving a defrost signal from the air conditioner, determine whether the reversing pressure difference of the four-way valve in the air conditioner is greater than or equal to a preset minimum pressure difference value and less than or equal to a preset maximum pressure difference value. If it is determined that the reversing pressure difference of the four-way valve in the air conditioner is greater than or equal to the preset minimum pressure difference and less than or equal to the preset maximum pressure difference, then it is determined that the four-way valve in the air conditioner needs to perform a reversing operation during defrosting. The following steps are taken: First, determine the current differential pressure range within a set differential pressure range for the reversing differential pressure of the four-way valve in the air conditioner. Second, determine the current temperature range within a set temperature range for the outdoor ambient temperature of the air conditioner. Third, determine the power-on / off interval of the four-way valve in the air conditioner. Fourth, determine the reversing sequence of the four-way valve based on the power-on / off interval of the four-way valve in the air conditioner. Finally, control the reversing operation of the four-way valve during defrosting based on the reversing sequence of the four-way valve in the air conditioner.

2. The control method for an air conditioner according to claim 1, characterized in that, Obtaining the switching pressure difference of the four-way valve in the air conditioner includes any of the following methods: The first method of acquisition: Obtain the discharge port pressure value of the compressor in the air conditioner, and obtain the suction port pressure value of the compressor in the air conditioner; The absolute value of the difference between the discharge port pressure value and the suction port pressure value of the compressor in the air conditioner is used as the reversing pressure difference of the four-way valve in the air conditioner. The second method of obtaining it: The temperature of the indoor heat exchanger coil of the air conditioner is obtained and recorded as the indoor coil temperature of the air conditioner; and the temperature of the outdoor heat exchanger coil of the air conditioner is obtained and recorded as the outdoor coil temperature of the air conditioner. The indoor coil temperature of the air conditioner is converted into a pressure value and recorded as the first pressure value; and the outdoor coil temperature of the air conditioner is converted into a pressure value and recorded as the second pressure value. The absolute value of the difference between the first pressure value and the second pressure value is used as the switching pressure difference of the four-way valve in the air conditioner.

3. The control method for an air conditioner according to claim 1, characterized in that, The set differential pressure range includes: a first differential pressure range and a second differential pressure range; Determining the current differential pressure range within the set differential pressure range for the reversing differential pressure of the four-way valve in the air conditioner includes: If the reversing pressure difference of the four-way valve in the air conditioner is greater than or equal to the first set pressure difference and less than or equal to the second set pressure difference, then the current pressure difference range is determined to be the first pressure difference range; the first set pressure difference is the preset minimum pressure difference value, and the second set pressure difference is less than or equal to the preset maximum pressure difference value; If the reversing pressure difference of the four-way valve in the air conditioner is greater than the second set pressure difference, then the current pressure difference range is determined to be the second pressure difference range; The set temperature range includes: a first temperature range, a second temperature range, and a third temperature range; Determining the current temperature range within which the outdoor ambient temperature of the air conditioner falls within the set temperature range includes: If the outdoor ambient temperature of the air conditioner is lower than the first set temperature, then the current temperature range is determined to be the first temperature range; If the outdoor ambient temperature of the air conditioner is greater than or equal to the first set temperature and less than or equal to the second set temperature, then the current temperature range is determined to be the second temperature range; If the outdoor ambient temperature of the air conditioner is greater than the second set temperature, then the current temperature range is determined to be the third temperature range.

4. The control method for an air conditioner according to claim 3, characterized in that, Determining the power-off interval of the four-way valve in the air conditioner within the current temperature range that the outdoor ambient temperature of the air conditioner falls within the set temperature range includes: Under the first differential pressure range, if the current temperature range is the first temperature range, then the power-off interval time of the four-way valve is determined to be the first set time. If the current temperature range is the second temperature range within the first differential pressure range, then the power-off interval time of the four-way valve is determined to be the second set time. If the current temperature range is the third temperature range within the first differential pressure range, then the power-off interval time of the four-way valve is determined to be the third set time. Under the second differential pressure range, if the current temperature range is the first temperature range, then the power-off interval time of the four-way valve is determined to be the fourth set time. Under the second differential pressure range, if the current temperature range is the second temperature range, then the power-off interval time of the four-way valve is determined to be the fifth set time. If the current temperature range is the third temperature range under the second differential pressure range, then the power-off interval time of the four-way valve is determined to be the sixth set time. Wherein, the fourth set time is greater than the first set time, the fifth set time is greater than the second set time, and the sixth set time is greater than the third set time.

5. A control device for an air conditioner, characterized in that, include: The acquisition unit is configured to acquire the outdoor ambient temperature of the air conditioner and the reversing pressure difference of the four-way valve in the air conditioner when the air conditioner is operating in heating mode; wherein, the reversing pressure difference of the four-way valve in the air conditioner is the pressure difference between the suction and discharge ports of the compressor in the air conditioner when the four-way valve in the air conditioner reverses. The control unit is configured to, upon receiving a defrost signal from the air conditioner, determine whether the reversing pressure difference of the four-way valve in the air conditioner is greater than or equal to a preset minimum pressure difference and less than or equal to a preset maximum pressure difference. The control unit is further configured to determine that the four-way valve in the air conditioner needs to perform a reversing operation during defrosting if it is determined that the reversing pressure difference of the four-way valve in the air conditioner is greater than or equal to the preset minimum pressure difference and less than or equal to the preset maximum pressure difference. The control unit is further configured to: determine the current differential pressure range within a set differential pressure range for the reversing differential pressure of the four-way valve in the air conditioner; determine the current temperature range within a set temperature range for the outdoor ambient temperature of the air conditioner under the current differential pressure range within the set differential pressure range for the reversing differential pressure of the four-way valve in the air conditioner; determine the power-on / off interval time of the four-way valve in the air conditioner under the current temperature range within the set temperature range for the outdoor ambient temperature of the air conditioner; and determine the reversing sequence of the four-way valve in the air conditioner based on the power-on / off interval time of the four-way valve in the air conditioner, so as to control the reversing operation of the four-way valve in the air conditioner during defrosting based on the reversing sequence of the four-way valve in the air conditioner.

6. The control device for an air conditioner according to claim 5, characterized in that, The acquisition unit acquires the switching pressure difference of the four-way valve in the air conditioner, including any of the following acquisition methods: The first method of acquisition: Obtain the discharge port pressure value of the compressor in the air conditioner, and obtain the suction port pressure value of the compressor in the air conditioner; The absolute value of the difference between the discharge port pressure value and the suction port pressure value of the compressor in the air conditioner is used as the reversing pressure difference of the four-way valve in the air conditioner. The second method of obtaining it: The temperature of the indoor heat exchanger coil of the air conditioner is obtained and recorded as the indoor coil temperature of the air conditioner; and the temperature of the outdoor heat exchanger coil of the air conditioner is obtained and recorded as the outdoor coil temperature of the air conditioner. The indoor coil temperature of the air conditioner is converted into a pressure value and recorded as the first pressure value; and the outdoor coil temperature of the air conditioner is converted into a pressure value and recorded as the second pressure value. The absolute value of the difference between the first pressure value and the second pressure value is used as the switching pressure difference of the four-way valve in the air conditioner.

7. The control device for an air conditioner according to claim 6, characterized in that, The set differential pressure range includes: a first differential pressure range and a second differential pressure range; The control unit determines the current differential pressure range within the set differential pressure range of the four-way valve in the air conditioner, including: If the reversing pressure difference of the four-way valve in the air conditioner is greater than or equal to the first set pressure difference and less than or equal to the second set pressure difference, then the current pressure difference range is determined to be the first pressure difference range; the first set pressure difference is the preset minimum pressure difference value, and the second set pressure difference is less than or equal to the preset maximum pressure difference value; If the reversing pressure difference of the four-way valve in the air conditioner is greater than the second set pressure difference, then the current pressure difference range is determined to be the second pressure difference range; The set temperature range includes: a first temperature range, a second temperature range, and a third temperature range; The control unit determines the current temperature range within the set temperature range to which the outdoor ambient temperature of the air conditioner belongs, including: If the outdoor ambient temperature of the air conditioner is lower than the first set temperature, then the current temperature range is determined to be the first temperature range; If the outdoor ambient temperature of the air conditioner is greater than or equal to the first set temperature and less than or equal to the second set temperature, then the current temperature range is determined to be the second temperature range; If the outdoor ambient temperature of the air conditioner is greater than the second set temperature, then the current temperature range is determined to be the third temperature range.

8. The control device for an air conditioner according to claim 7, characterized in that, The control unit, when the outdoor ambient temperature of the air conditioner falls within the current temperature range of the set temperature range, determines the power-off interval time of the four-way valve in the air conditioner, including: Under the first differential pressure range, if the current temperature range is the first temperature range, then the power-off interval time of the four-way valve is determined to be the first set time. If the current temperature range is the second temperature range within the first differential pressure range, then the power-off interval time of the four-way valve is determined to be the second set time. If the current temperature range is the third temperature range within the first differential pressure range, then the power-off interval time of the four-way valve is determined to be the third set time. Under the second differential pressure range, if the current temperature range is the first temperature range, then the power-off interval time of the four-way valve is determined to be the fourth set time. Under the second differential pressure range, if the current temperature range is the second temperature range, then the power-off interval time of the four-way valve is determined to be the fifth set time. If the current temperature range is the third temperature range under the second differential pressure range, then the power-off interval time of the four-way valve is determined to be the sixth set time. Wherein, the fourth set time is greater than the first set time, the fifth set time is greater than the second set time, and the sixth set time is greater than the third set time.

9. An air conditioner, characterized in that, include: The control device for an air conditioner as described in any one of claims 5 to 8.

10. A storage medium, characterized in that, The storage medium includes a stored program, wherein, when the program is executed, the device containing the storage medium is controlled to perform the control method of the air conditioner according to any one of claims 1 to 4.

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