Electric heating dry-burning prevention control method and air conditioner

Abstract

The application provides an electric heating dry burning prevention control method and air conditioner, the control method comprises the following steps: S1, the air conditioner determines whether the current running state meets the electric heating closing condition; if yes, proceed to step S2; if no, the air conditioner normally runs, and returns to step S1; S2, the air conditioner detects the indoor coil temperature TE, the electric heater current IA and the surface load K of the electric heating pipe in real time; S3, the air conditioner determines whether TE, IA and K all meet the dry burning condition; if yes, proceed to step S4; if no, the air conditioner normally runs, and returns to step S1; S4, the air conditioner generates a power-off request flag for the air conditioner socket to power off; the electric heating dry burning prevention control method and air conditioner improve the accuracy of dry burning determination, can effectively avoid the dry burning of the electric heater, and facilitate troubleshooting and maintenance of the faults and abnormalities of the electric heater.

Description

TECHNICAL FIELD

[0001] The present application relates to the air conditioning technical field, especially relates to a control method for preventing dry burning of electric heating and air conditioner. BACKGROUND

[0002] Air conditioner is an indispensable electrical equipment in people's daily life, and has various structural forms. With the continuous improvement of industrial design level, and the use of new technology, new material and new modeling on air conditioner, various air conditioners are developed, and the control method of air conditioner is also optimized accordingly.

[0003] Taking the air conditioner with electric heating function as an example, the electric heating function of the air conditioner in the prior art is often realized by PTC electric heater (such as PTC semiconductor heating ceramic), which is installed on the inner side of the evaporator of the indoor unit close to the air outlet. The opening and closing of the electric heater are realized by controlling the switch of the relay. However, in the long-term use process, the relay contact will appear sticky, so that the electric heater cannot be normally closed when it needs to be closed, which leads to electric heating dry burning and causes safety hazards.

[0004] Therefore, under the condition that the electric heater cannot be normally closed, how to accurately identify this abnormal condition and avoid safety accidents has become one of the problems to be solved in the field. SUMMARY

[0005] Therefore, the present application aims to provide a control method for preventing dry burning of electric heating and air conditioner to solve the problems of the prior art, such as the electric heater cannot be normally closed, and how to improve the accuracy of identifying the safety hazard that the electric heater cannot be normally closed.

[0006] To achieve the above purpose, the technical scheme of the present application is as follows:

[0007] The application discloses a control method for electric heating and dry burning prevention, and belongs to the technical field of air conditioners. The control method comprises the following steps: S1, determining whether the current running state of the air conditioner meets the electric heating closing condition; if yes, entering step S2; if not, the air conditioner normally runs, and returning to step S1; S2, detecting the indoor coil temperature TE, the electric heater current IA and the surface load K of the electric heating pipe of the air conditioner in real time; S3, determining whether the TE, IA and K all meet the dry burning condition; if yes, performing step S4; if not, the air conditioner normally runs, and returning to step S1; S4, generating a power-off request flag for the air conditioner socket to perform power-off; wherein the dry burning condition comprises that the TE is greater than a third preset temperature T3, the IA is greater than a first preset current Ia, the K is greater than a first preset load C, and all of them last for a second rated time length. Therefore, the electric heating closing condition is set to determine whether the electric heating is actually unnecessary to be turned on, and on this basis, the dry burning determination is continuously set, so that the abnormal condition that the electric heating should be closed but is actually not closed is identified, and the air conditioner socket is powered off correspondingly, the dry burning of the electric heater is avoided, and the troubleshooting and maintenance of the fault and abnormal condition of the electric heater are facilitated. In the dry burning determination process, the TE, IA and K all need to meet the dry burning condition, the accuracy of the dry burning determination is improved, the misjudgment caused by the single determination logic is avoided, the surface load K of the electric heating pipe is used to replace the electric heating pipe temperature determination condition in the prior art, the interference caused by the hindering effect of air on the actual temperature detection of the surface of the electric heating pipe is avoided, the accuracy of the detection data is improved, and the accuracy of the dry burning determination is effectively improved.

[0008] Further, in step S2, K=P / (pi*R*L), wherein P is the actual use power of the electric heating pipe, R is the diameter of the electric heating pipe, and L is the length of the electric heating pipe; the surface load K of the electric heating pipe is used to replace the electric heating pipe temperature determination condition in the prior art, the interference caused by the hindering effect of air on the actual temperature detection of the surface of the electric heating pipe is avoided, the accuracy of the detection data is improved, and the accuracy of the dry burning determination is effectively improved.

[0009] Further, in the air conditioner zero-out condition, the first preset load C is the surface load limit value Cmax of the electric heating pipe; in the air conditioner wind speed is the mute wind, the first preset load C is Cmax-the electric heating pipe surface actual temperature is 130 DEG C corresponding to the electric heating pipe surface load value; in the air conditioner wind speed is low wind, the first preset load C is Cmax-the electric heating pipe surface actual temperature is 150 DEG C corresponding to the electric heating pipe surface load value; in the air conditioner wind speed is medium wind, the first preset load C is Cmax-the electric heating pipe surface actual temperature is 180 DEG C corresponding to the electric heating pipe surface load value; in the air conditioner wind speed is high wind, the first preset load C is Cmax-the electric heating pipe surface actual temperature is 200 DEG C corresponding to the electric heating pipe surface load value; in the air conditioner wind speed is strong wind, the first preset load C is Cmax-the electric heating pipe surface actual temperature is 220 DEG C corresponding to the electric heating pipe surface load value.For K in the dry burning condition determination process, by comprehensively considering the air conditioner outflow condition (specifically the wind speed), according to different outflow conditions, the actual value of the first preset load C in the dry burning condition is adjusted, so that the dry burning determination in the application can be more suitable for the current running mode of the air conditioner, which is beneficial to further improve the accuracy of the dry burning determination.

[0010] Further, the electric heating closing condition includes: the outer ring temperature TR≥the first preset temperature T1 and lasts for the first rated time; or, the indoor environment temperature TA≥the second preset temperature T2 and lasts for the first rated time; or, the air conditioner is powered off and the fan and the compressor are not turned on; or, the air conditioner is powered off. Specifically, step S1 includes: S11, the air conditioner detects the outer ring temperature TR; S12, the air conditioner determines whether the outer ring temperature TR≥the first preset temperature T1 and lasts for the first rated time; if yes, proceed to step S2; if no, proceed to step S13; S13, the air conditioner detects the indoor environment temperature TA; S14, the air conditioner determines whether the indoor environment temperature TA≥the second preset temperature T2 and lasts for the first rated time; if yes, proceed to step S2; if no, proceed to step S15; S15, the air conditioner determines whether the air conditioner is powered off and the fan and the compressor are not turned on; if yes, proceed to step S2; if no, proceed to step S16; S16, the air conditioner determines whether the air conditioner is powered off; if yes, proceed to step S2; if no, the air conditioner is normally running and returns to step S11; preferably, the first rated time is 8s-15s, the first preset temperature T1 is-2℃-3℃, and the second preset temperature T2 is 20℃-25℃. Thus, by setting the electric heating closing condition, it is determined whether the electric heating is actually unnecessary to be turned on, and on this basis, the dry burning determination is continued to be set to ensure that the electric heating is actually in the premise of being closed.

[0011] Further, the step S4 comprises: S41, the air conditioner generates a power-off request flag for the air conditioner socket to power off; S42, the air conditioner detects the indoor coil temperature TE, the electric heater current IA and the surface load K of the electric heating pipe in real time; S43, the air conditioner determines whether TE, IA and K all meet the exit condition; if yes, step S44 is performed; S44, the air conditioner clears the power-off request flag, normally runs and returns to step S1; wherein the exit condition comprises: TE < fourth preset temperature T4, IA < second preset current Ib and K < second preset load D, and all last for a third rated time. Thus, after determining dry burning, the exit condition is additionally determined to avoid hysteresis or misjudgment and to avoid unnecessary power off of the air conditioner. Meanwhile, the air conditioner can be controlled after power off to avoid the air conditioner being always in the power-off state.

[0012] Further, in the step S4, the air conditioner generates a power-off request flag, sends the power-off request flag to the mobile terminal, the mobile terminal receives the power-off request flag, transmits the power-off request to the intelligent socket end of the air conditioner, and the intelligent socket end automatically powers off the air conditioner controller after receiving the power-off request, so that the air conditioner is powered off in time and automatically after determining dry burning.

[0013] An air conditioner adopts the control method for preventing dry burning of electric heating, and comprises an electric heater for realizing the electric heating function of the air conditioner.

[0014] Compared with the prior art, the control method for preventing dry burning of electric heating and the air conditioner have the following advantages:

[0015] The control method for preventing dry burning of electric heating and the air conditioner determine whether the electric heating actually needs to be turned on by setting the electric heating off condition, continue to set the dry burning determination on this basis, identify the abnormal condition that the electric heating should be turned off but is not actually turned off, and accordingly power off the air conditioner socket to avoid dry burning of the electric heater and facilitate troubleshooting and maintenance of the electric heater.

[0016] In the dry burning determination process, TE, IA and K all need to meet the dry burning condition, which improves the accuracy of dry burning determination and avoids misjudgment due to single determination logic; meanwhile, the surface load K of the electric heating pipe is used to replace the electric heating pipe temperature determination condition in the prior art to avoid the interference of the actual temperature detection of the electric heating pipe surface caused by the blocking effect of air on heat conduction, which is beneficial to improving the accuracy of detection data and effectively improving the accuracy of dry burning determination.

[0017] In addition, this application also takes into account the air conditioner's air outlet conditions (specifically, the wind speed) during the determination of K under dry-burning conditions. Based on different air outlet conditions, the actual value of the first preset load C in the dry-burning conditions is adjusted so that the dry-burning determination in this application can better fit the current operating mode of the air conditioner, which is conducive to further improving the accuracy of the dry-burning determination. Attached Figure Description

[0018] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0019] Figure 1 This is a schematic flowchart of an electric heating anti-dry-burning control method according to an embodiment of the present invention. Detailed Implementation

[0020] The inventive concepts of this disclosure will be described below using terminology commonly used by those skilled in the art to communicate the essence of their work to others skilled in the art. However, these inventive concepts may be embodied in many different forms and should not be construed as limited to the embodiments described herein.

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0022] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] In existing technologies, the electric heating function of air conditioners is often achieved through a PTC electric heater (such as a PTC semiconductor heating ceramic). This PTC electric heater is installed inside the evaporator of the indoor unit near the air outlet, and its on / off state is controlled by a relay switch. However, during long-term use, the relay contacts may become sticky, causing the electric heater to fail to shut off properly when needed, resulting in dry burning and posing a safety hazard.

[0024] To address the issues of electric heaters failing to shut off properly in existing technologies, and how to improve the accuracy of identifying this safety hazard, this embodiment proposes a control method for preventing dry burning of electric heaters, as shown in the attached figure. Figure 1 As shown, the control method includes:

[0025] S1. The air conditioner determines whether the current operating status meets the conditions for turning off the electric heating; if yes, proceed to step S2; if no, the air conditioner operates normally and returns to step S1.

[0026] The electric heating shutdown conditions include:

[0027] The outer ring temperature TR is greater than or equal to the first preset temperature T1, and remains at the first rated duration.

[0028] Alternatively, the indoor ambient temperature TA ≥ the second preset temperature T2, and remains at the first rated duration;

[0029] Alternatively, the air conditioner is turned off, and neither the fan nor the compressor is turned on;

[0030] Or, the air conditioner lost power.

[0031] The rated values ​​and preset values ​​involved in this application can be understood as the preset data of the air conditioner developed and designed by the air conditioner manufacturer before the air conditioner leaves the factory. In order to adapt to the user's own usage habits, at least some of the preset data of the air conditioner can also be adjusted by the user. Among them, the technology for obtaining the outer ring temperature TR and the indoor ambient temperature TA is quite common in the air conditioning industry, and will not be described in detail in this application.

[0032] Considering the significant differences in R&D concepts, air conditioner types, and operating environments among different air conditioner manufacturers, this application does not impose restrictions on the preset data for air conditioners, but only provides a few reference data as examples. For instance: the first rated duration is 8s-15s, preferably 10s; the first preset temperature T1 is -2℃-3℃, preferably -1℃; and the second preset temperature T2 is 20℃-25℃, preferably 24℃. Here, "normal operation of the air conditioner" can also be understood as the air conditioner continuing to operate in its current state.

[0033] Assuming the air conditioner operates normally and the control method is error-free, the four sub-conditions in the electric heating shutdown condition can be set in any order. This application does not specify the order in which the sub-conditions are determined; only one example is provided for reference.

[0034] Step S1 includes:

[0035] S11, Air conditioning system detects outer ring temperature TR;

[0036] S12. The air conditioner determines whether the outer ring temperature TR is greater than or equal to the first preset temperature T1 and remains at the first rated temperature for a certain duration. If yes, proceed to step S2; otherwise, proceed to step S13.

[0037] S13. Air conditioning system detects indoor ambient temperature (TA).

[0038] S14. The air conditioner determines whether the indoor ambient temperature TA is greater than or equal to the second preset temperature T2 and continues for the first rated duration; if yes, proceed to step S2; if no, proceed to step S15.

[0039] S15. Determine if the air conditioner is turned off and the fan and compressor are not turned on; if yes, proceed to step S2; if no, proceed to step S16.

[0040] S16. The air conditioner determines whether there is a power failure; if yes, proceed to step S2; if no, the air conditioner operates normally and returns to step S11.

[0041] S2. Real-time monitoring of indoor coil temperature TE, electric heater current IA, and surface load K of electric heating element in air conditioner;

[0042] Among them, the detection and acquisition technologies for indoor coil temperature TE and electric heater current IA are quite common in the air conditioning field and will not be elaborated upon.

[0043] For the surface load K of the electric heating element, K = P / (π × R × L), where P is the actual power used by the electric heating element, which can be obtained through a conventional power meter; π is pi, which can be approximated as 3.14; R is the diameter of the electric heating element; and L is the length of the electric heating element. Correspondingly, K distributes the actual power of the electric heating element evenly across a unit area of ​​the heating element. If the units of R and L are cm, and the unit of P is W, then the unit of K is W / cm². 2 For example: Assuming the heating element diameter is 2.5cm, the heating element length is 50cm, and the current heating power is 785W, the surface load of the electric heating element K = 785 / (3.14 * 2.5 * 50) = 785 / 392.5 = 2W / cm² 2 .

[0044] S3. The air conditioner determines whether TE, IA, and K all meet the dry-burning conditions; if yes, proceed to step S4; if no, the air conditioner operates normally and returns to step S1.

[0045] The dry-burning conditions include: TE ≥ third preset temperature T3, IA ≥ first preset current Ia, and K ≥ first preset load C, all of which last for the second rated duration.

[0046] Since the electric heater is installed near the evaporator, if dry burning occurs, the instantaneous values ​​of TE and IA will become very large. T3 can represent the instantaneous limit value of the coil temperature when dry burning occurs, and Ia can represent the instantaneous limit value of the electric heating current when dry burning occurs.

[0047] For K, since the heat transfer medium of the electric heating element is air, and air hinders heat conduction, it affects the detection of the actual surface temperature of the electric heating element. Therefore, in order to improve the accuracy of dry burning determination, this application does not use the limit temperature of the heating medium to determine how many degrees the electric heating element can heat to, but uses the surface load K of the electric heating element. By obtaining the surface load K, the actual surface temperature of the electric heating element can be accurately determined, thereby determining whether the electric heating element is dry burning; the first preset load C is the surface load limit value of the electric heating element. In the zero air outlet state of the air conditioner, C can be recorded as Cmax, that is, Cmax is the surface load limit value of the electric heating element in the zero air outlet state of the air conditioner; the second rated duration is 5s.

[0048] For electric heaters with varying models, sizes, power, and installation environments, the correlation between surface load K and the actual surface temperature of the heating element differs, but overall, the relationship is approximately linear. The applicant uses actual R&D data from an air conditioner using a specific brand of electric heater as an example to illustrate the relationship between K and the actual surface temperature of the heating element:

[0049] Surface load 1W / cm 2 The actual surface temperature of the electric heating element is approximately 300℃.

[0050] Surface load 2W / cm 2 The actual surface temperature of the electric heating element is approximately 400℃.

[0051] Surface load 3W / cm 2 The actual surface temperature of the electric heating element is approximately 500℃;

[0052] Surface load 4W / cm 2 The actual surface temperature of the electric heating element is approximately 600℃;

[0053] Surface load 5W / cm 2 The actual surface temperature of the electric heating element is approximately 700℃;

[0054] Surface load 6W / cm 2 The actual surface temperature of the electric heating element is approximately 800℃;

[0055] Surface load 7W / cm 2 The actual surface temperature of the electric heating element is approximately 900℃;

[0056] Surface load 8W / cm 2 The actual surface temperature of the electric heating element is approximately 1000℃.

[0057] Correspondingly, since the actual surface temperature of the electric heating element is affected by the air conditioner's airflow when the heating power remains constant, the first preset load C in the dry-burning condition is not a constant preset value, but is adjusted according to the air conditioner's airflow status.

[0058] When the air conditioner is in zero-airflow mode, the first preset load C is the surface load limit value Cmax of the electric heating element;

[0059] When the air conditioner fan speed is set to silent mode, the first preset load C is Cmax - the surface load value of the electric heating element corresponding to an actual surface temperature of 130℃.

[0060] When the air conditioner fan speed is low, the first preset load C is Cmax - the surface load value of the electric heating element corresponding to an actual surface temperature of 150℃.

[0061] When the air conditioner fan speed is medium, the first preset load C is Cmax - the surface load value of the electric heating element corresponding to an actual surface temperature of 180℃.

[0062] When the air conditioner fan speed is high, the first preset load C is Cmax - the surface load value of the electric heating element corresponding to an actual surface temperature of 200℃.

[0063] When the air conditioner fan speed is at the strong speed, the first preset load C is Cmax - the surface load value of the electric heating element corresponding to the actual surface temperature of the electric heating element being 220℃.

[0064] S4. The air conditioner generates a power-off request flag, which is used to disconnect the power to the air conditioner socket;

[0065] Specifically, the air conditioner generates a power-off request flag and sends it to the mobile device. After receiving the flag, the mobile device forwards the power-off request to the air conditioner's smart socket. Upon receiving the request, the smart socket automatically powers off the air conditioner controller. The mobile device can be a common smartphone, tablet, computer, or smart central control device.

[0066] Therefore, this application determines whether the electric heating is no longer needed by setting the electric heating shutdown condition. Based on this, a dry burning judgment is set to identify the abnormal situation of "the electric heating should be turned off, but it is not actually turned off" and the power is cut off to the air conditioner socket accordingly to prevent the electric heater from dry burning. It also facilitates the troubleshooting and repair of the electric heater's faults and abnormalities.

[0067] In the dry-burning determination process, TE, IA, and K all need to meet the dry-burning conditions, which improves the accuracy of the dry-burning determination and avoids misjudgment due to the relatively simple determination logic. At the same time, this application uses the surface load K of the electric heating tube to replace the temperature determination condition of the electric heating tube in the prior art, which avoids the interference caused by the "impedance of air to heat conduction" on the actual surface temperature detection of the electric heating tube, which helps to improve the accuracy of the detection data and can effectively improve the accuracy of the dry-burning determination.

[0068] In addition, this application also takes into account the air conditioner's air outlet conditions (specifically, the wind speed) during the determination of K under dry-burning conditions. Based on different air outlet conditions, the actual value of the first preset load C in the dry-burning conditions is adjusted so that the dry-burning determination in this application can better fit the current operating mode of the air conditioner, which is conducive to further improving the accuracy of the dry-burning determination.

[0069] Considering the hysteresis in electronic control technology and the possibility of misjudgment in certain special cases, this application further sets an exit condition in step S4. Specifically, S4 includes:

[0070] S41. The air conditioner generates a power-off request flag, which is used to disconnect the power to the air conditioner socket;

[0071] S42. Real-time monitoring of indoor coil temperature TE, electric heater current IA, and surface load K of electric heating element in air conditioner;

[0072] S43. The air conditioner determines whether TE, IA, and K all meet the exit conditions; if so, proceed to step S44.

[0073] S44. The air conditioner clears the power failure request flag, resumes normal operation, and returns to step S1;

[0074] The exit conditions include: TE < fourth preset temperature T4, IA < second preset current Ib, and K < second preset load D, all lasting for a third rated duration. The electric heating element is installed near the evaporator. Considering hysteresis to ensure logical rationality, T4 is the maximum value of normal coil sampling, Ib is the maximum value of normal current detection, D is the maximum value of normal electric heating element surface load, and the third rated duration is 5 seconds. Furthermore, in step S43, if the exit conditions are not met, the air conditioner maintains its current state and returns to step S42. If the air conditioner has already completed a power-off, this can be understood as the air conditioner continuing to remain powered off.

[0075] Therefore, this application, after determining dry burning, also performs an additional check for exit conditions to avoid hysteresis or misjudgment, and to prevent the air conditioner from unnecessarily losing power. It also facilitates the management of the air conditioner after a power outage, preventing it from remaining in a power-off state indefinitely.

[0076] In this invention, for any air conditioner, while having an electric heating function, the control method described in this embodiment can be used. In addition, the air conditioner also includes conventional air conditioner components such as an electric heater, heat exchange coil, fan, compressor, temperature detector, current detector, and power detector. Since these are existing technologies, they will not be described in detail here.

[0077] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A control method for preventing dry burning of electric heating, characterized in that, The control method includes: S1. The air conditioner determines whether the current operating status meets the conditions for turning off the electric heating; if yes, proceed to step S2; if no, the air conditioner operates normally and returns to step S1. S2. Real-time monitoring of indoor coil temperature TE, electric heater current IA, and surface load K of electric heating element in air conditioner; S3. The air conditioner determines whether TE, IA, and K all meet the dry-burning conditions; if yes, proceed to step S4; if no, the air conditioner operates normally and returns to step S1. S4. The air conditioner generates a power-off request flag, which is used to disconnect the power to the air conditioner socket; The dry-burning conditions include: TE ≥ third preset temperature T3, IA ≥ first preset current Ia, and K ≥ first preset load C, all of which last for the second rated duration. Step S1 includes: S11, Air conditioning system detects outer ring temperature TR; S12. The air conditioner determines whether the outer ring temperature TR is greater than or equal to the first preset temperature T1 and remains at the first rated temperature for a certain duration. If yes, proceed to step S2; otherwise, proceed to step S13. S13. Air conditioning system detects indoor ambient temperature (TA). S14. The air conditioner determines whether the indoor ambient temperature TA is greater than or equal to the second preset temperature T2 and continues for the first rated duration; if yes, proceed to step S2; if no, proceed to step S15. S15. Determine if the air conditioner is turned off and the fan and compressor are not turned on; if yes, proceed to step S2; if no, proceed to step S16. S16. The air conditioner determines whether there is a power failure; if yes, proceed to step S2; if no, the air conditioner operates normally and returns to step S11.

2. The control method for preventing dry burning of electric heating according to claim 1, characterized in that, In step S2, K = P / (π×R×L), where P is the actual power used by the electric heating tube, R is the diameter of the electric heating tube, and L is the length of the electric heating tube.

3. The control method for preventing dry burning of electric heating according to claim 1, characterized in that, When the air conditioner is in zero-airflow mode, the first preset load C is the surface load limit value Cmax of the electric heating element; When the air conditioner fan speed is set to silent mode, the first preset load C is Cmax - the surface load value of the electric heating element corresponding to an actual surface temperature of 130℃. When the air conditioner fan speed is low, the first preset load C is Cmax - the surface load value of the electric heating element corresponding to an actual surface temperature of 150℃. When the air conditioner fan speed is medium, the first preset load C is Cmax - the surface load value of the electric heating element corresponding to an actual surface temperature of 180℃. When the air conditioner fan speed is high, the first preset load C is Cmax - the surface load value of the electric heating element corresponding to an actual surface temperature of 200℃. When the air conditioner fan speed is at the strong speed, the first preset load C is Cmax - the surface load value of the electric heating element corresponding to the actual surface temperature of the electric heating element being 220℃.

4. The control method for preventing dry burning of electric heating according to claim 1, characterized in that, The electric heating shutdown conditions include: The outer ring temperature TR is greater than or equal to the first preset temperature T1, and remains at the first rated duration. Alternatively, the indoor ambient temperature TA ≥ the second preset temperature T2, and remains at the first rated duration; Alternatively, the air conditioner is turned off, and neither the fan nor the compressor is turned on; Or, the air conditioner lost power.

5. The control method for preventing dry burning of electric heating according to claim 1, characterized in that, The first rated duration is 8s-15s, the first preset temperature T1 is -2℃-3℃, and the second preset temperature T2 is 20℃-25℃.

6. The control method for preventing dry burning of electric heating according to claim 1, characterized in that, Step S4 includes: S41. The air conditioner generates a power-off request flag, which is used to disconnect the power to the air conditioner socket; S42. Real-time monitoring of indoor coil temperature TE, electric heater current IA, and surface load K of electric heating element in air conditioner; S43. The air conditioner determines whether TE, IA, and K all meet the exit conditions; if so, proceed to step S44. S44. The air conditioner clears the power failure request flag, resumes normal operation, and returns to step S1.

7. The control method for preventing dry burning of electric heating according to claim 6, characterized in that, The exit conditions include: TE < fourth preset temperature T4, IA < second preset current Ib, and K < second preset load D, all of which last for the third rated duration.

8. The control method for preventing dry burning of electric heating according to claim 1, characterized in that, In step S4, the air conditioner generates a power-off request flag and sends the power-off request flag to the mobile terminal. After receiving the power-off request flag, the mobile terminal transmits the power-off request to the smart socket terminal of the air conditioner. After receiving the power-off request, the smart socket terminal automatically turns off the power to the air conditioner controller.

9. An air conditioner, characterized in that, The air conditioner uses the electric heating anti-dry burning control method according to any one of claims 1-8; the air conditioner includes an electric heater for realizing the electric heating function of the air conditioner.

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