Anti-cold wind control method of air conditioner and air conditioner

Abstract

The present invention provides an air conditioner and a wind prevention control method for the air conditioner. The method includes: when the defrosting of the air conditioner ends or the heating starts, the indoor environmental temperature T1, the indoor coil temperature T2, and the user's remote control set temperature Tst are detected in real time. When T2≤T1 and T2≤Tst are satisfied, the air conditioner enters the cold wind prevention mode; the rising rate ΔT2 / Δt of T2 and the indoor coil temperature is obtained in real time. If T2≥TS1, and ΔT2 / Δt≥K1, the indoor fan is controlled to start running at the first running rate; if T2≥TS2, and ΔT2 / Δt≥K2, the indoor fan is controlled to start running at the second running rate; where K1<K2 and is greater than 0, and TS1<TS2; it is judged whether T2 is not less than the sum of TS2 and ΔT1 and lasts for the first preset time. If so, the air conditioner is controlled to exit the cold wind prevention mode. The air conditioner and the control method of the present invention enter / exit the cold wind prevention mode at an appropriate time, and there is still a small amount of warm air blown out during the cold wind prevention period, effectively improving the thermal comfort of users.

Description

Technical Field

[0001] The present invention relates to the field of air conditioners, and specifically to an anti-cold wind control method and an air conditioner for an air conditioner. Background Art

[0002] When the defrosting of the air conditioner ends or the heating mode is started, since the temperature of the indoor coil is relatively low, in order to avoid blowing out cold air, the air conditioner generally has an anti-cold wind function. However, for conventional anti-cold wind control, it is necessary to wait until the temperature of the indoor heat exchange device rises to a certain temperature before the indoor fan is turned on, so that the warm air cannot be quickly blown out after the air conditioner is turned on for heating, affecting the user experience. At the same time, the conventional anti-cold wind control system judges the time for preventing cold wind only by judging the high or low temperature of the indoor coil for a long time, resulting in the warm air not being quickly blown out after the air conditioner is turned on for heating, affecting the user's thermal comfort. Summary of the Invention

[0003] Aiming at the above problems, the present invention provides an anti-cold wind control method and an air conditioner for an air conditioner. The present invention controls the operating speed of the indoor fan by comprehensively considering the indoor coil temperature T2 and the rising rate of the indoor coil temperature ΔT2 / Δt, and combines the indoor ambient temperature T1 and the user's remote control set temperature Tst to judge the entry condition of the anti-cold wind mode. By comparing the sum of the second preset temperature TS2 and the change in the indoor ambient temperature / ΔT with the indoor coil temperature T2, the exit of the anti-cold wind mode is judged, so that the air conditioner enters / exits the anti-cold wind mode at an appropriate time, and a small amount of warm air is blown out during the anti-cold wind period, effectively improving the user's thermal comfort.

[0004] The present invention provides an air conditioner, which includes a compressor, a four-way valve, an indoor heat exchange device, a throttle valve, and an outdoor heat exchange device that are sequentially connected to form a refrigerant circulation loop. An indoor fan is correspondingly provided for the indoor heat exchange device. The air conditioner further includes: an acquisition module for real-time acquiring the indoor coil temperature T2, the indoor ambient temperature T1, and the user's remote control set temperature Tst; a calculation module for calculating the rising rate of the indoor coil temperature ΔT2 / Δt; a judgment module for judging whether the indoor coil temperature T2 is not less than a first preset temperature TS1 and / or a second preset temperature TS2, and whether the rising rate of the indoor coil temperature ΔT2 / Δt is not less than a first preset rate K1 and / or a second preset rate K2; and judging whether the indoor coil temperature T2 is less than the indoor ambient temperature T1 and less than the user's remote control set temperature Tst, and whether the indoor coil temperature T2 is not less than the sum of the second preset temperature TS2 and the change in the indoor ambient temperature ΔT1 and lasts for a first preset time; an execution module for, if the indoor coil temperature T2 is less than the indoor ambient temperature T1 and less than the user's remote control set temperature Tst, controlling the air conditioner to enter the anti-cool wind mode; if the indoor coil temperature T2 is not less than the first preset temperature TS1 and the rising rate of the indoor coil temperature ΔT2 / Δt is not less than the first preset rate K1, controlling the indoor fan to start running at a first operating rate; if the indoor coil temperature T2 is not less than the second preset temperature TS2 and the rising rate of the indoor coil temperature ΔT2 / Δt is not less than the second preset rate K2, controlling the indoor fan to start running at a second operating rate; wherein, the second preset rate K2 is greater than the first preset rate K1 and greater than 0, and the first preset temperature TS1 is less than the second preset temperature TS2; if the indoor coil temperature T2 is not less than the sum of the second preset temperature TS2 and the change in the indoor ambient temperature ΔT1 and lasts for the first preset time, controlling the air conditioner to exit the anti-cool wind mode.

[0005] According to this technical solution, when T2≤T1 and T2≤Tst, the indoor coil temperature is relatively low. At this time, entering the anti-cool wind mode can prevent the indoor fan from blowing cold air at the set speed, causing discomfort.

[0006] When T2≥TS1 and ΔT2 / Δt≥K1, the air blown by the indoor fan has a certain temperature. At this time, starting the indoor fan at the first operating rate can deliver some heat to the indoor, so that hot air can be blown indoors, improving the comfort experience of users; when T2≥TS2 and ΔT2 / Δt≥K2, at this time the indoor coil temperature is relatively high, and the rising rate of the indoor coil temperature is also relatively fast. The indoor fan runs at a greater operating rate, and the blown air has a higher temperature, and the indoor ambient temperature rises faster; when T2≥TS2+ΔT1, the indoor coil temperature is relatively high, and the anti-cool wind mode is exited.

[0007] The present invention controls the operating speed of the indoor fan by comprehensively considering the indoor coil temperature T2 and the rising rate of the indoor coil temperature ΔT2 / Δt, and sets the entry condition of the anti-cold wind mode in combination with the indoor ambient temperature T1 and the user's remote control set temperature Tst. By comparing the sum of the second preset temperature TS2 and the change in the indoor ambient temperature ΔT with the indoor coil temperature T2, it is determined whether to exit the anti-cold wind mode, enabling the air conditioner to enter / exit the anti-cold wind mode at an appropriate time, and there is still a small amount of warm air blown out during the anti-cold wind period, effectively improving the user's thermal comfort.

[0008] In an alternative technical solution of the present invention, when the rising rate of the indoor coil temperature ΔT2 / Δt is not less than the first preset rate K1 and the indoor fan operates at the first operating speed, the judgment module is further configured to determine whether the indoor coil temperature T2 is less than TS1 - TC, where 1 ≤ TC ≤ 3, and when the indoor coil temperature T2 satisfies being less than Ts1 - TC, the execution module controls the indoor fan to stop operating and re-enter the anti-cold wind mode.

[0009] According to this technical solution, when ΔT2 / Δt ≥ K1 and T2 < TS1 - TC, controlling the indoor fan to stop operating and re-enter the anti-cold wind mode can prevent the indoor fan from blowing cold air and improve the thermal comfort during use.

[0010] In an alternative technical solution of the present invention, when the rising rate of the indoor coil temperature ΔT2 / Δt is not less than the second preset rate K2 and the indoor fan operates at the second operating speed, the judgment module is further configured to determine whether the indoor coil temperature T2 is less than TS2 - TC, where 1 ≤ TC ≤ 3, and when the indoor coil temperature T2 satisfies being less than TS2 - TC, the execution module controls the indoor fan to reduce to the first operating speed.

[0011] According to this technical solution, when ΔT2 / Δt ≥ K2 and T2 < TS2 - TC, controlling the reduction of the operating speed of the indoor fan can prevent the indoor fan from rotating too fast and blowing cold air, effectively avoiding the situation of sudden cold and heat indoors, improving the thermal comfort during use, and the fluctuation range of T2 is the value range of TC. With a small fluctuation range, it can enable the air conditioner to quickly blow out warm air after starting heating after blowing cold air for a long time.

[0012] In an alternative technical solution of the present invention, an operation module is further included, which performs operations to increase / decrease the operating speed of the indoor fan according to the judgment result: if the indoor coil temperature T2 is not less than the first preset temperature and lasts for a duration of t1, it is judged whether the rising rate of the indoor coil temperature ΔT2 / Δt is not less than the first preset rate K1. If ΔT2 / Δt < K1, the execution module controls the current compressor frequency Fn to increase one gear to Fn+1 according to the preset gear of the compressor or the throttle valve opening Ln to decrease one gear to Ln-1, and cyclically obtains the rising rate of the indoor coil temperature ΔT2 / Δt, and compares the rising rate of the indoor coil temperature ΔT2 / Δt with the first preset rate K1.

[0013] According to this technical solution, by judging the magnitude relationship and the continuous duration between the indoor coil temperature T2 and the first preset temperature, and the magnitude relationship between the rising rate of the indoor coil temperature ΔT2 / Δt and the first preset rate K1, the frequency of the compressor / the opening of the throttle valve is controlled to increase the indoor coil temperature and the rising rate of the indoor coil temperature, effectively avoiding the situation of no warm air blowing out for a long time due to preventing cold air in winter, and improving the thermal comfort of users.

[0014] In an alternative technical solution of the present invention, if T2 ≥ TS2 and lasts for a duration of t2, it is judged whether the rising rate of the indoor coil temperature ΔT2 / Δt is not less than the second preset rate K2. If ΔT2 / Δt < K2, the execution module controls the current compressor frequency Fn to continue to increase one gear to Fn+1 according to the preset gear of the compressor or the throttle valve opening Ln to continue to decrease one gear to Ln-1, and cyclically obtains the rising rate of the indoor coil temperature ΔT2 / Δt, and compares the rising rate of the indoor coil temperature ΔT2 / Δt with the second preset rate K2.

[0015] According to this technical solution, by judging the magnitude relationship and the continuous duration between the indoor coil temperature T2 and the second preset temperature, and the magnitude relationship between the rising rate of the indoor coil temperature ΔT2 / Δt and the second preset rate K2, and controlling the frequency of the compressor / the opening of the throttle valve to increase the indoor coil temperature and its rising rate, effectively avoiding the situation of no warm air blowing out for a long time due to preventing cold air in winter, and improving the thermal comfort of users.

[0016] The present invention further provides a method for controlling anti-cold air of an air conditioner, including the following steps:

[0017] When the defrosting of the air conditioner ends or the heating is started, the indoor environmental temperature T1, the indoor coil temperature T2, and the user's remote control set temperature Tst are detected in real time. When T2 ≤ T1 and T2 ≤ Tst are satisfied, the air conditioner enters the anti-cold air mode;

[0018] Judge in real time whether the indoor coil temperature T2 is not less than the first preset temperature TS1;

[0019] If the indoor coil temperature T2 is not less than the first preset temperature TS1, obtain the rising rate ΔT2 / Δt of the indoor coil temperature;

[0020] Determine whether the rising rate ΔT2 / Δt of the indoor coil temperature is not less than the first preset rate K1;

[0021] If the rising rate ΔT2 / Δt of the indoor coil temperature is not less than the first preset rate K1, control the indoor fan to start running at the first operating rate;

[0022] Continuously determine whether the indoor coil temperature T2 is not less than the second preset temperature TS2;

[0023] If the indoor coil temperature T2 is not less than the second preset temperature TS2, obtain the rising rate ΔT2 / Δt of the indoor coil temperature;

[0024] Determine whether the rising rate ΔT2 / Δt of the indoor coil temperature is not less than the second preset rate K2;

[0025] If the rising rate ΔT2 / Δt of the indoor coil temperature is not less than the second preset rate K2, control the indoor fan to start running at the second operating rate; wherein, the second preset rate K2 is greater than the first preset rate K1 and greater than 0, and the first preset temperature TS1 is less than the second preset temperature TS2;

[0026] Determine whether the indoor coil temperature T2 is not less than the sum of the second preset temperature TS2 and the indoor ambient temperature change amount ΔT1 and lasts for the first preset time. If so, control the air conditioner to exit the anti-cold wind mode.

[0027] In an alternative technical solution of the present invention, if the rising rate ΔT2 / Δt of the indoor coil temperature is not less than the first preset rate K1 and the indoor fan is running at the first operating rate, determine whether the indoor coil temperature T2 is less than TS1 - TC, where 1 ≤ TC ≤ 3, and when the indoor coil temperature T2 satisfies being less than TS1 - TC, control the indoor fan to stop running and re-enter the anti-cold wind mode.

[0028] In an alternative technical solution of the present invention, if the rising rate ΔT2 / Δt of the indoor coil temperature is not less than the second preset rate K2 and the indoor fan is running at the second operating rate, determine whether the indoor coil temperature T2 is less than TS2 - TC, and when the indoor coil temperature T2 satisfies being less than TS2 - TC, control the indoor fan to reduce to the first operating rate.

[0029] In an alternative technical solution of the present invention, it further includes: if the indoor coil temperature T2 is not less than the first preset temperature TS1 and lasts for a duration of t1, then it is determined whether the rising rate of the indoor coil temperature ΔT2 / Δt is not less than the first preset rate K1. If ΔT2 / Δt < K1, then the current compressor frequency Fn is controlled to increase one gear to Fn+1 according to the preset gear of the compressor or the throttle valve opening Ln is decreased one gear to Ln-1, and the rising rate of the indoor coil temperature ΔT2 / Δt is cyclically obtained;

[0030] If T2 ≥ TS2 and lasts for a duration of t2, then it is determined whether the rising rate of the indoor coil temperature ΔT2 / Δt is not less than the second preset rate K2. If ΔT2 / Δt < K2, then the execution module controls the current compressor frequency Fn to continue to increase one gear to Fn+1 according to the preset gear of the compressor or the throttle valve opening Ln to continue to decrease one gear to Ln-1, and the rising rate of the indoor coil temperature ΔT2 / Δt is cyclically obtained.

[0031] In an alternative technical solution of the present invention, if the first operating rate and the second operating rate are not less than the preset rate by the user's remote control; then the indoor fan operates at the preset rate by the user's remote control and simultaneously exits the anti-cold wind mode.

[0032] According to this technical solution, by comparing the preset rate by the user's remote control with the first operating rate and the second operating rate, the operating speed of the indoor fan is within the range of the speed set by the user, meeting the user's needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic structural diagram of an air conditioner in the first embodiment of the present invention.

[0034] Figure 2 It is a schematic flowchart of the anti-cold wind control method of the air conditioner in the first embodiment of the present invention.

[0035] Figure 3 It is a schematic structural diagram of an air conditioner in the second embodiment of the present invention.

[0036] Figure 4 It is a schematic flowchart of the anti-cold wind control method of the air conditioner in the second embodiment of the present invention.

[0037] Reference Signs:

[0038] Acquisition module 1; Calculation module 2; Judgment module 3; Execution module 4; Operation module 5. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0040]

First Embodiment

[0041] The first embodiment of the present invention provides an air conditioner, which includes a compressor, a four-way valve, an indoor heat exchange device, a throttle valve, and an outdoor heat exchange device connected in sequence to form a refrigerant circulation circuit. An indoor fan is correspondingly provided for the indoor heat exchange device. As Figure 1 shown, the air conditioner further includes: an acquisition module 1 for real-time acquisition of the indoor coil temperature T2, the indoor ambient temperature T1, and the user remote control set temperature Tst; a calculation module 2 for calculating the rising rate ΔT2 / Δt of the indoor coil temperature; a judgment module 3 for judging whether the indoor coil temperature T2 is not less than a first preset temperature TS1 and / or a second preset temperature TS2, and whether the rising rate ΔT2 / Δt of the indoor coil temperature is not less than a first preset rate K1 and / or a second preset rate K2; and judging whether the indoor coil temperature T2 is less than the indoor ambient temperature T1 and less than the user remote control set temperature Tst, and whether the indoor coil temperature T2 is not less than the sum of the second preset temperature TS2 and the indoor ambient temperature change amount ΔT1 and lasts for a first preset time; an execution module 4, if the indoor coil temperature T2 is less than the indoor ambient temperature T1 and less than the user remote control set temperature Tst, controlling the air conditioner to enter the anti-cold wind mode; if the indoor coil temperature T2 is not less than the first preset temperature TS1 and the rising rate ΔT2 / Δt of the indoor coil temperature is not less than the first preset rate K1, controlling the indoor fan to start running at a first operating rate; if the indoor coil temperature T2 is not less than the second preset temperature TS2 and the rising rate ΔT2 / Δt of the indoor coil temperature is not less than the second preset rate K2, controlling the indoor fan to start running at a second operating rate; wherein, the second preset rate K2 is greater than the first preset rate K1 and greater than 0; TS1 < TS2; if the indoor coil temperature T2 is not less than the sum of the second preset temperature TS2 and the indoor ambient temperature change amount ΔT1 and lasts for a first preset time, controlling the air conditioner to exit the anti-cold wind mode.

[0042] By the above method, when T2 ≤ T1 and T2 ≤ Tst, the indoor coil temperature is relatively low. At this time, entering the anti-cold wind mode can prevent the indoor fan from blowing cold wind at a set speed, causing discomfort.

[0043] When T2≥TS1 and ΔT2 / Δt≥K1, the air blown out by the indoor fan has a certain temperature. At this time, starting the indoor fan at the first operating speed can deliver some heat into the room, so that hot air can be blown into the room, improving the user's thermal comfort experience; when T2≥TS2 and ΔT2 / Δt≥K2, the indoor coil temperature is relatively high at this time, and the rising rate of the indoor coil temperature is also relatively fast. The indoor fan operates at a greater operating speed, and the blown air has a higher temperature, and the indoor ambient temperature rises relatively fast; when T2≥TS2+ΔT1, the indoor coil temperature T2 is relatively high, and the anti-cold wind mode is exited.

[0044] The present invention controls the operating speed of the indoor fan by comprehensively considering the indoor coil temperature T2 and the rising rate of the indoor coil temperature ΔT2 / Δt, and combines the indoor ambient temperature T1 and the user's remote control set temperature Tst to set the entry condition of the anti-cold wind mode. By comparing the sum of the second preset temperature TS2 and the change in the indoor ambient temperature / ΔT with the indoor coil temperature T2, it is judged whether to exit the anti-cold wind mode, so that the air conditioner enters / exits the anti-cold wind mode at an appropriate time, and there is still a small amount of warm air blown out during the anti-cold wind period, effectively improving the user's thermal comfort.

[0045] In a preferred embodiment of the present invention, if the rising rate of the indoor coil temperature ΔT2 / Δt is not less than the first preset rate K1, and the indoor fan operates at the first operating speed, if T2≥TS2 and ΔT2 / Δt≥K2 are not satisfied at the same time, the judgment module 3 is further used to judge the relationship between T2 and TS1-TC. The judgment module 3 judges whether the indoor coil temperature T2 is less than TS1-TC or T2 is ≥TS1-TC, 1≤TC≤3, and when the indoor coil temperature T2 satisfies less than TS1-TC (T2<TS1-TC), the execution module 4 controls the indoor fan to stop running and re-enter the anti-cold wind mode. If T2≥TS1-TC, the indoor fan operates at the first operating speed.

[0046] Through the above method, when ΔT2 / Δt≥K1 and T2≤TS1-TC, controlling the indoor fan to stop running can prevent the indoor fan from blowing out cold air and improve the thermal comfort of use.

[0047] In a preferred embodiment of the present invention, if the rising rate of the indoor coil temperature ΔT2 / Δt is not less than the second preset rate K2 and the indoor fan operates at the second operating speed, the judgment module 3 is further used to judge whether the indoor coil temperature T2 is not less than TS2+ΔT1. If T2≥TS2+ΔT1 is satisfied, the air conditioner is controlled to exit the anti-cold wind mode. If T2≥TS2+ΔT1 is not satisfied, it is further judged whether T2 is less than TS2-TC, 1≤TC≤3, and when the indoor coil temperature T2 satisfies less than TS2-TC, the execution module 4 controls the indoor fan to reduce to the first operating speed.

[0048] In the above manner, when ΔT2 / Δt≥K2 and T2<TS2 - TC, reducing the operating speed of the indoor fan can prevent the indoor fan from rotating too fast and blowing out cold air, effectively avoiding the situation of sudden cold and heat in the room, improving the thermal comfort during use, and the fluctuation range of T2 is between 1 and 3 when TC is in this range, preferably TC = 2. With a small fluctuation range, after blowing cold air for a long time, the air conditioner can quickly blow out warm air after starting heating.

[0049] In a preferred embodiment of the present invention, the judgment module 3 is used to judge the relationship between the first operating speed and the second operating speed and the user's remote control preset speed. If the first operating speed and the second operating speed are not less than the user's remote control preset speed, the execution module 4 controls the indoor fan to operate at the user's remote control preset speed and simultaneously exits the anti - cold - air mode.

[0050] In the above manner, by comparing the user's remote control preset speed with the first operating speed and the second operating speed, the operating speed of the indoor fan is within a certain range of the user's preset speed, meeting the user's needs.

[0051] As Figure 2 shown, corresponding to the first embodiment of the present invention, the present invention further provides an anti - cold - air control method for an air conditioner, including the following steps:

[0052] When the air conditioner finishes defrosting or starts heating, the indoor environmental temperature T1, the indoor coil temperature T2, and the user's remote control set temperature Tst are detected in real time. When T2≤T1 and T2≤Tst are satisfied, the air conditioner enters the anti - cold - air mode;

[0053] Judge in real time whether the indoor coil temperature T2 is not less than the first preset temperature TS1;

[0054] If the indoor coil temperature T2 is not less than the first preset temperature TS1, obtain the rising rate ΔT2 / Δt of the indoor coil temperature;

[0055] Judge whether the rising rate ΔT2 / Δt of the indoor coil temperature is not less than the first preset rate K1;

[0056] If the rising rate ΔT2 / Δt of the indoor coil temperature is not less than the first preset rate K1, control the indoor fan to start running at the first operating speed;

[0057] Judge in real time whether the indoor coil temperature T2 is not less than the second preset temperature TS2;

[0058] If the indoor coil temperature T2 is not less than the second preset temperature TS2, obtain the rising rate ΔT2 / Δt of the indoor coil temperature;

[0059] Judge whether the rising rate ΔT2 / Δt of the indoor coil temperature is not less than the second preset rate K2;

[0060] If the rising rate of the indoor coil temperature ΔT2 / Δt is not less than the second preset rate K2, control the indoor fan to start running at the second running rate; wherein, the second preset rate K2 is greater than the first preset rate K1 and greater than 0, and TS1 < TS2;

[0061] Judge whether the indoor coil temperature T2 is not less than the sum of the second preset temperature TS2 and the indoor ambient temperature change ΔT1 and lasts for a specified time. If so, control the air conditioner to exit the anti-cold wind mode.

[0062] Specifically, the indoor coil temperature T2 can be detected by a first detection module (such as a temperature sensor) provided at the indoor coil, and the indoor ambient temperature T1 can be obtained by a second detection module provided in the indoor environment where the air conditioner is located. The calculation module 2, the judgment module 3, and the execution module 4 are at least partially integrated into the control device of the air conditioner; preferably, a storage device is further included for storing the above preset values and judgment conditions.

[0063] In a preferred embodiment of the present invention, the anti-cold wind control method further includes: if the rising rate of the indoor coil temperature ΔT2 / Δt is not less than the first preset rate K1, and the indoor fan is running at the first running rate, if T2≥TS2 and ΔT2 / Δt≥K2 are not simultaneously satisfied, the judgment module 3 is further used to judge the relationship between T2 and TS1-TC. The judgment module 3 judges whether the indoor coil temperature T2 satisfies being less than TS1-TC. If so, control the indoor fan to stop running and re-enter the anti-cold wind mode.

[0064] In a preferred embodiment of the present invention, the anti-cold wind control method further includes: if the rising rate of the indoor coil temperature ΔT2 / Δt is not less than the second preset rate K2, and when the indoor fan is running at the second running rate, judge whether the indoor coil temperature T2 is less than TS2-TC, and when the indoor coil temperature T2 satisfies being less than TS2-TC, control the indoor fan to reduce to the first running rate to run.

[0065] In a preferred embodiment of the present invention, it further includes: judging the relationship between the first running rate and the second running rate and the user remote control preset rate. If the first running rate and the second running rate are not less than the user remote control preset rate; then control the indoor fan to run at the user remote control preset rate and simultaneously exit the anti-cold wind mode.

[0066]

Second Embodiment

[0067] In severe cold regions, when the air conditioner starts to operate in heating mode in winter, the indoor coil temperature T2 is relatively low and the rising rate of ΔT2 / Δt is slow, resulting in too long anti-cold wind time or the air conditioner being unable to exit the anti-cold wind mode all the time. To solve the above problems, please refer to Figure 3As shown in the figure, the second embodiment of the present invention provides an anti-cold wind control system for an air conditioner. The difference from the first embodiment is that it further includes an operation module 5 that performs operations on increasing or decreasing the operation speed of the indoor fan according to the judgment result. In the anti-cold wind mode, if the indoor coil temperature T2 is not less than the first preset temperature and lasts for a duration of t1, it is judged whether the rising rate ΔT2 / Δt of the indoor coil temperature is less than the first preset rate K1. If ΔT2 / Δt < K1, the execution module 4 controls the current compressor frequency Fn to increase one gear to Fn+1 according to the preset gear of the compressor (preferably, Fn = ceiling(0.9Fn+1)) or the throttle valve opening Ln to decrease one gear to Ln-1 (preferably, Ln = 4 + Ln-1), and continuously obtains the rising rate ΔT2 / Δt of the indoor coil temperature, and compares the rising rate ΔT2 / Δt of the indoor coil temperature with the first preset rate K1. If the rising rate ΔT2 / Δt of the indoor coil temperature ≥ K1, the indoor fan of the air conditioner is controlled to start running at the first operation speed.

[0068] By the above method, the operation module 5 judges the indoor coil temperature T2 and the first preset temperature, as well as the rising rate ΔT2 / Δt of the indoor coil temperature and the first preset rate K1, and controls the frequency of the compressor / the opening of the throttle valve to increase the indoor coil temperature and its rising rate, effectively avoiding the situation of no warm air blowing out for a long time due to anti-cold wind in winter and improving the thermal comfort of users.

[0069] In the preferred embodiment of the present invention, when the indoor fan runs at the first operation speed, if T2 ≥ TS2 and lasts for a duration of t2, it is judged whether the rising rate ΔT2 / Δt of the indoor coil temperature is less than the second preset rate K2. If ΔT2 / Δt < K2, the execution module 4 controls the current compressor frequency Fn to continue to increase one gear to Fn+1 according to the preset gear of the compressor or the throttle valve opening Ln to decrease one gear to Ln-1, and continuously obtains the rising rate ΔT2 / Δt of the indoor coil temperature, and compares the rising rate ΔT2 / Δt of the indoor coil temperature with the second preset rate K2; if the condition of T2 ≥ TS2 and lasting for a duration of t2 is not satisfied, the indoor fan is controlled to continue running at the first operation speed; if the rising rate ΔT2 / Δt of the indoor coil temperature ≥ K2, the indoor fan of the air conditioner is controlled to start running at the second operation speed.

[0070] By the above method, by judging the magnitude relationship and the continuous duration between the indoor coil temperature T2 and the second preset temperature, as well as the magnitude relationship between the rising rate ΔT2 / Δt of the indoor coil temperature and the second preset rate K2, and controlling the frequency of the compressor / the opening of the throttle valve to increase the indoor coil temperature and its rising rate, effectively avoiding the situation of no warm air blowing out for a long time due to anti-cold wind in winter and improving the thermal comfort of users.

[0071] As Figure 4As shown, corresponding to the second embodiment of the present invention, the present invention provides a cold air prevention control method for an air conditioner. The difference from the first embodiment is that it further includes:

[0072] If the indoor coil temperature T2 is not less than the first preset temperature and lasts for a duration of t1, then it is judged whether the rising rate ΔT2 / Δt of the indoor coil temperature is less than the first preset rate K1. If ΔT2 / Δt < K1, then control the current compressor frequency Fn to increase one gear to Fn+1 according to the preset gear of the compressor (preferably, Fn = ceiling(0.9Fn+1)) or reduce the throttle valve opening Ln by one gear to Ln-1, and cyclically obtain the rising rate ΔT2 / Δt of the indoor coil temperature, and compare the rising rate ΔT2 / Δt of the indoor coil temperature with the first preset rate K1.

[0073] If T2≥TS2 and lasts for a duration of t2, then it is judged whether the rising rate ΔT2 / Δt of the indoor coil temperature is less than the second preset rate K2. If ΔT2 / Δt < K2, then the execution module 4 controls the current compressor frequency Fn to continue to increase one gear to Fn+1 according to the preset gear of the compressor or reduce the throttle valve opening Ln by one gear to Ln-1, and cyclically obtain the rising rate ΔT2 / Δt of the indoor coil temperature, and compare the latest result of the rising rate ΔT2 / Δt of the indoor coil temperature with the second preset rate K2.

[0074] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An air conditioner, comprising a compressor, a four-way valve, an indoor heat exchange device, a throttle valve, and an outdoor heat exchange device that are connected in sequence to form a refrigerant circulation circuit, and an indoor fan is correspondingly provided for the indoor heat exchange device, characterized in that, The air conditioner further includes: an acquisition module that acquires the indoor coil temperature T2, the indoor ambient temperature T1, and the user's remote control set temperature Tst in real time; a calculation module that calculates the rising rate of the indoor coil temperature ΔT2 / Δt; a judgment module that is used to judge whether the indoor coil temperature T2 is not less than a first preset temperature TS1 and / or a second preset temperature TS2, and whether the rising rate of the indoor coil temperature ΔT2 / Δt is not less than a first preset rate K1 and / or a second preset rate K2; and judge whether the indoor coil temperature T2 is less than the indoor ambient temperature T1 and less than the user's remote control set temperature Tst; whether the indoor coil temperature T2 is not less than the sum of the second preset temperature TS2 and the change in the indoor ambient temperature ΔT1 and lasts for a first preset time; an execution module that, if the indoor coil temperature T2 is not greater than the indoor ambient temperature T1 and not greater than the user's remote control set temperature Tst, controls the air conditioner to enter the anti-cold wind mode; if the indoor coil temperature T2 is not less than the first preset temperature TS1 and the rising rate of the indoor coil temperature ΔT2 / Δt is not less than the first preset rate K1, controls the indoor fan to start running at a first operating rate; if the indoor coil temperature T2 is not less than the second preset temperature TS2 and the rising rate of the indoor coil temperature ΔT2 / Δt is not less than the second preset rate K2, controls the indoor fan to start running at a second operating rate; wherein, the second preset rate K2 is greater than the first preset rate K1 and greater than 0, and the first preset temperature TS1 is less than the second preset temperature TS2; if the indoor coil temperature T2 is not less than the sum of the second preset temperature TS2 and the change in the indoor ambient temperature ΔT1 and lasts for a first preset time, controls the air conditioner to exit the anti-cold wind mode.

2. The air conditioner according to claim 1, wherein if the rising rate of the indoor coil temperature ΔT2 / Δt is not less than the first preset rate K1 and the indoor fan runs at the first operating rate, the judgment module is further used to judge whether the indoor coil temperature T2 is less than TS1 - TC, 1 ≤ TC ≤ 3, and when the indoor coil temperature T2 satisfies being less than TS1 - TC, the execution module controls the indoor fan to stop running and re-enter the anti-cold wind mode.

3. The air conditioner according to claim 1, wherein if the rising rate of the indoor coil temperature ΔT2 / Δt is not less than the second preset rate K2 and the indoor fan runs at the second operating rate, the judgment module is further used to judge whether the indoor coil temperature T2 is less than TS2 - TC, 1 ≤ TC ≤ 3, and when the indoor coil temperature T2 satisfies being less than TS2 - TC, the execution module controls the indoor fan to reduce to the first operating rate.

4. The air conditioner according to claim 1, wherein it further includes an operation module that performs operations to increase / decrease the operating rate of the indoor fan according to the judgment result: If the indoor coil temperature T2 is not less than the first preset temperature TS1 and lasts for a duration of t1, then it is determined whether the rising rate ΔT2 / Δt of the indoor coil temperature is not less than the first preset rate K1. If ΔT2 / Δt < K1, the execution module controls the current compressor frequency Fn to increase one gear according to the compressor preset gear or controls the throttle valve opening Ln to decrease one gear according to the throttle valve preset gear, and cyclically obtains the rising rate ΔT2 / Δt of the indoor coil temperature, and compares the rising rate ΔT2 / Δt of the indoor coil temperature with the first preset rate K1.

5. The air conditioner according to claim 4, characterized in that, If the indoor coil temperature T2 is not less than the second preset temperature TS2 and lasts for a duration of t2, then it is determined whether the rising rate ΔT2 / Δt of the indoor coil temperature is not less than the second preset rate K2. If ΔT2 / Δt < K2, the execution module controls the current compressor frequency Fn to continue to increase one gear according to the compressor preset gear or controls the opening Ln of the throttle valve to decrease one gear, and cyclically obtains the rising rate ΔT2 / Δt of the indoor coil temperature, and compares the rising rate ΔT2 / Δt of the indoor coil temperature with the second preset rate K2.

6. A method for preventing cold air in an air conditioner, the air conditioner includes a compressor, a four-way valve, an indoor heat exchange device, a throttle valve, and an outdoor heat exchange device that are sequentially connected to form a refrigerant circulation circuit, and an indoor fan is correspondingly provided for the indoor heat exchange device, and is characterized in that, The anti-cold wind control method of the air conditioner includes the following steps: When the defrosting of the air conditioner ends or the heating starts, the indoor environment temperature T1, the indoor coil temperature T2, and the user remote control set temperature Tst are detected in real time. When T2 ≤ T1 and T2 ≤ Tst are satisfied, the air conditioner enters the anti-cold wind mode; It is determined in real time whether the indoor coil temperature T2 is not less than the first preset temperature TS1; If the indoor coil temperature T2 is not less than the first preset temperature TS1, the rising rate ΔT2 / Δt of the indoor coil temperature is obtained; It is determined whether the rising rate ΔT2 / Δt of the indoor coil temperature is not less than the first preset rate K1; If the rising rate ΔT2 / Δt of the indoor coil temperature is not less than the first preset rate K1, the indoor fan is controlled to start running at the first running rate; It is determined in real time whether the indoor coil temperature T2 is not less than the second preset temperature TS2; If the indoor coil temperature T2 is not less than the second preset temperature TS2, the rising rate ΔT2 / Δt of the indoor coil temperature is obtained; It is determined whether the rising rate ΔT2 / Δt of the indoor coil temperature is not less than the second preset rate K2; If the rising rate ΔT2 / Δt of the indoor coil temperature is not less than the second preset rate K2, the indoor fan is controlled to start running at the second running rate; wherein, the second preset rate K2 is greater than the first preset rate K1 and greater than 0, and the first preset temperature TS1 is less than the second preset temperature TS2; It is determined whether the indoor coil temperature T2 is not less than the sum of the second preset temperature TS2 and the indoor environment temperature change amount ΔT1 and lasts for a specified time. If so, the air conditioner is controlled to exit the anti-cold wind mode.

7. The anti-cold wind control method of the air conditioner according to claim 6, characterized in that, If the rising rate of the indoor coil temperature ΔT2 / Δt is not less than the first preset rate K1, when the indoor fan operates at the first operating rate, it is determined whether the indoor coil temperature T2 is less than TS1 - TC, where 1 ≤ TC ≤ 3, and when the indoor coil temperature T2 satisfies being less than TS1 - TC, the indoor fan is controlled to stop operating and re-enter the anti-cold wind mode.

8. The anti-cold wind control method of the air conditioner according to claim 6, characterized in that, If the rising rate of the indoor coil temperature ΔT2 / Δt is not less than the second preset rate K2, and when the indoor fan operates at the second operating rate, it is determined whether the rising rate of the indoor coil temperature ΔT2 / Δt is less than TS2 - TC, and when the indoor coil temperature T2 satisfies being less than TS2 - TC, the indoor fan is controlled to reduce to the first operating rate for operation.

9. The anti-cold wind control method of the air conditioner according to claim 6, characterized in that, It further includes: If the indoor coil temperature T2 is not less than the first preset temperature TS1 and lasts for a duration of t1, it is determined whether the rising rate of the indoor coil temperature ΔT2 / Δt is not less than the first preset rate K1. If ΔT2 / Δt < K1, the current compressor frequency Fn is controlled to increase one gear to Fn+1 according to the compressor preset gear or the throttle valve opening Ln is reduced one gear to Ln-1, and the rising rate of the indoor coil temperature ΔT2 / Δt is cyclically obtained; If T2 ≥ TS2 and lasts for a duration of t2, it is determined whether the rising rate of the indoor coil temperature ΔT2 / Δt is not less than the second preset rate K2. If ΔT2 / Δt < K2, the execution module controls the current compressor frequency Fn to continue to increase one gear to Fn+1 according to the compressor preset gear or the throttle valve opening Ln is reduced one gear to Ln-1, and the rising rate of the indoor coil temperature ΔT2 / Δt is cyclically obtained.

10. The anti-cold wind control method of the air conditioner according to claim 6, characterized in that, If both the first operating rate and the second operating rate are not less than the user remote control preset rate, the indoor fan operates at the user remote control preset rate and synchronously exits the anti-cold wind mode.

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