Defrosting temperature sensor detection method and air conditioner

Abstract

The invention discloses a defrosting temperature sensor detection method and an air conditioner, relates to the technical field of air conditioners, and is used for detecting whether a defrosting temperature sensor in the air conditioner falls off or not. Whether the defrosting temperature is larger than the sum of the saturation temperature and a first preset value or not, the defrosting temperature is larger than the difference between the environment temperature and a second preset value or not and the condition that the accumulated number of times is larger than or equal to a third preset value or not is judged in sequence, and if yes, it is judged that the defrosting temperature sensor falls off; if not, whether the air conditioner is in a defrosting mode or not and whether the rising value of the defrosting temperature is smaller than or equal to a fourth preset value or not after preset time are sequentially judged, and if yes, it is judged that the defrosting temperature sensor falls off. The method has the advantage that whether the defrosting temperature sensor falls off or not can be accurately detected.

Description

Technical Field

[0001] The invention relates to the technical field of air conditioners, and in particular to a defrosting temperature sensor detection method and an air conditioner. Background Art

[0002] The air conditioner may frost when in heating mode. When the air conditioner is severely frosted, it will seriously affect the heating performance of the air conditioner and even damage the compressor. As an important judgment condition for the air conditioner to enter the defrost mode, the accuracy of the defrost temperature is undoubtedly very important. Therefore, determining whether the defrost temperature collected by the defrost temperature sensor is the actual defrost temperature of the air conditioner is the basis for judging whether the air conditioner has entered the defrost mode.

[0003] However, the defrost temperature sensor may fall off from the air conditioner due to various factors. Once the defrost temperature sensor falls off, the defrost temperature detected will be close to the ambient temperature, or even higher than the actual defrost temperature. The consequences include but are not limited to: the air conditioner is actually frosted very seriously, but because the defrost temperature detected by the defrost temperature sensor is close to the ambient temperature and does not meet the system-set conditions for entering the defrost mode, the defrost program will not be triggered, resulting in the air conditioner being unable to enter the defrost mode, and thus unable to defrost, which in turn causes the frost thickness on the heat exchanger to increase. This will seriously affect the heating performance of the air conditioner and even damage the compressor of the air conditioner.

[0004] Therefore, how to judge whether the defrost temperature sensor has fallen off from the air conditioner is an important technical problem to be solved by those skilled in the art. Summary of the invention

[0005] The present invention aims to solve one of the technical problems in the related art to a certain extent. To this end, the present invention provides a defrost temperature sensor detection method, which has the advantage of accurately detecting whether the defrost temperature sensor is detached.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A defrost temperature sensor detection method is used to detect whether the defrost temperature sensor in an air conditioner has fallen off, comprising the following steps:

[0008] Compressor detection: determine whether the compressor is running. If the compressor is running, obtain the pressure value of the low-pressure gas in the compressor suction pipe and its corresponding saturation temperature;

[0009] Working state detection: determine whether the air conditioner is in heating condition, if yes, perform first cycle detection, if no, perform second cycle detection;

[0010] First cycle detection: determine whether conditions one, two and four are met in turn. If any one of them is no, re-determine whether the compressor is running. If all are yes, it is determined that the defrost temperature sensor has fallen; the condition one is that the defrost temperature is greater than the sum of the saturation temperature and the first preset value, the condition two is that the defrost temperature is greater than the difference between the ambient temperature and the second preset value, and the condition four is that the cumulative number of times that the conditions one and two are met at the same time increases by one and is greater than or equal to the third preset value;

[0011] The second cycle detection: determine in turn whether the air conditioner is in defrost mode and whether the rise in defrost temperature after a preset time meets condition three. If any one of them is no, re-determine whether the compressor is running. If both are yes, it is determined that the defrost temperature sensor has fallen; the condition three is that the rise in defrost temperature is less than or equal to the fourth preset value.

[0012] Optionally, in the compressor detection step, if the compressor is running, the pressure value of the low-pressure gas in the compressor suction pipe and its corresponding saturation temperature are obtained after a first preset time.

[0013] Optionally, when it is determined that the defrost temperature sensor has fallen, the compressor is turned off.

[0014] Optionally, when the compressor is turned off for a time period greater than or equal to a second preset time period, the compressor is started.

[0015] Optionally, the defrost temperature sensor detection method further includes the following steps:

[0016] If it is determined that the defrost temperature sensor has fallen, an alarm will be issued and the number of alarms will be accumulated.

[0017] Optionally, if the accumulated alarm times are greater than or equal to a fifth preset value, an alarm is triggered after shutdown and the accumulated shutdown times are calculated; if the accumulated alarm times are less than the fifth preset value, it is re-determined whether the compressor is running.

[0018] Optionally, if the cumulative number of shutdowns is less than a sixth preset value, the compressor is reset and restarted after a second preset time; if the cumulative number of shutdowns is greater than or equal to the sixth preset value, a forced shutdown is performed.

[0019] The present invention has the following beneficial effects:

[0020] The technical solution provided by the present invention can accurately determine whether the defrost temperature sensor has fallen off by collecting and comparing the saturation temperature, defrost temperature and ambient temperature. While ensuring the accuracy of the judgment, there is no need to add extra sensors, and only the existing sensors of the air conditioner can be used, without increasing additional production and procurement costs. In addition, the compressor can be shut down as appropriate according to the situation of the defrost temperature sensor falling off, so as to avoid the increase of frost thickness on the heat exchanger, thereby seriously affecting the heating performance of the air conditioner, and avoiding damage to the compressor of the air conditioner.

[0021] In addition, the present invention also provides an air conditioner having a heating condition, wherein the heating condition has a defrost mode. In the defrost mode, whether the defrost temperature sensor is detached is detected by any of the above-mentioned defrost temperature sensor detection methods.

[0022] The inference process of the beneficial effects of the air conditioner provided by the present invention is similar to the inference process of the beneficial effects of the aforementioned defrost temperature sensor detection method, and will not be repeated here.

[0023] Furthermore, the present invention further provides an electronic device, comprising:

[0024] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings. The best embodiments or means of the present invention will be described in detail in conjunction with the drawings, but they are not intended to limit the technical solutions of the present invention. In addition, there are multiple features, elements, and components that appear in each of the following texts and drawings, and different symbols or numbers are marked for convenience, but they all represent components with the same or similar structures or functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below in conjunction with the accompanying drawings:

[0026] Figure 1 Schematic diagram of a flow chart of an embodiment of the present invention. DETAILED DESCRIPTION

[0027] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments in the implementation manner are intended to be used to explain the present invention and should not be construed as limiting the present invention.

[0028] References in this specification to "one embodiment" or "an example" or "an example" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment itself may be included in at least one embodiment of the present patent disclosure. The appearance of the phrase "in one embodiment" in various places in the specification does not necessarily refer to the same embodiment.

[0029] As a first aspect of the present invention, a defrost temperature sensor detection method is provided, which is used to detect whether the defrost temperature sensor in an air conditioner is detached. Figure 1 As shown, the following steps are included:

[0030] Compressor detection: Determine whether the compressor is running. If so, obtain the pressure value of the low-pressure gas in the compressor suction pipe and its corresponding saturation temperature Te, i.e., the evaporation temperature, after the first preset time t1. It is a prior art in the art to obtain the corresponding saturation temperature Te under the pressure value of the low-pressure gas according to the pressure value of the low-pressure gas. The first preset time t1 can be flexibly selected by those skilled in the art according to actual needs, and will not be repeated here; if the compressor is not running, the defrost temperature sensor detection method is directly terminated.

[0031] Working state detection: determine whether the air conditioner is in heating condition. If yes, that is, the air conditioner is in heating condition, perform the first cycle detection. The first cycle detection is to determine in sequence:

[0032] Condition 1: Is the defrost temperature Tf greater than the sum of the saturation temperature Te and the first preset value a? The first preset value a can be flexibly selected by technicians in this field according to actual needs. If not, re-judge whether the compressor is running. If it is satisfied, proceed to the next condition.

[0033] Condition 2: Is the defrost temperature Tf greater than the difference between the ambient temperature Tao and the second preset value b? The second preset value b can be flexibly selected by technicians in this field according to actual needs. If not, re-judge whether the compressor is running. If satisfied, proceed to the next condition.

[0034] Condition 4: Whether the cumulative number of times C of both condition 1 and condition 2 increases once and is greater than or equal to the third preset value n1 is satisfied, wherein the third preset value n1 can be flexibly selected by those skilled in the art according to actual needs. If not satisfied, re-determine whether the compressor is running, and if satisfied, determine that the defrost temperature sensor has fallen. When it is determined that the defrost temperature sensor has fallen, the compressor is turned off.

[0035] In other words, in the first cycle detection, if any one of the items is no, it is re-determined whether the compressor is running. If both are yes, it is determined that the defrost temperature sensor has fallen. When the compressor is turned off for a time greater than or equal to the second preset time t3, the compressor is started. Among them, the second preset time t3 can be flexibly selected by those skilled in the art according to actual needs.

[0036] If the working state detection is negative, that is, the air conditioner is not in the heating state, the second cycle detection is performed. The second cycle detection is to judge in sequence:

[0037] Whether the air conditioner is in defrost mode, if the judgment result is no, then re-judgment whether the compressor is running, if the judgment result is yes, proceed to the next condition judgment;

[0038] After the preset time t2, whether the rising value Tf' of the defrost temperature satisfies the condition three, and the condition three is that the rising value Tf' of the defrost temperature is less than or equal to the fourth preset value n2. If not, it is re-determined whether the compressor is running. If it is satisfied, it is determined that the defrost temperature sensor has fallen. When it is determined that the defrost temperature sensor has fallen, the compressor is turned off. The preset time t2 and the fourth preset value n2 can be flexibly selected by those skilled in the art according to actual needs. In this step of judgment, since it has been determined that the air conditioner is in the defrost mode, the defrost temperature sensor first detects the first defrost temperature Tf1, and after the preset time t2, it is determined whether the air conditioner is in the defrost mode. If it is not in the defrost mode, it is re-determined whether the compressor is running. If it is in the defrost mode, the defrost temperature sensor detects the second defrost temperature Tf2. Based on the first defrost temperature Tf1 and the second defrost temperature Tf2, the rising value Tf' of the defrost temperature after the preset time t2 is calculated, that is, Tf'=Tf2-Tf1.

[0039] In other words, in the second cycle detection, if any one of the items is no, it is re-determined whether the compressor is running, and if both are yes, it is determined that the defrost temperature sensor has fallen. When the compressor is turned off for a time greater than or equal to the second preset time t3, the compressor is started.

[0040] The defrost temperature sensor detection method provided in this embodiment can accurately determine whether the defrost temperature sensor is off by collecting and comparing the saturation temperature Te, the defrost temperature Tf and the ambient temperature Tao. While ensuring the accuracy of the judgment, there is no need to add extra sensors, only the existing sensors of the air conditioner can be used, and no additional production and procurement costs are required.

[0041] After completing the detection of whether the defrost temperature sensor has fallen off and detecting that the defrost temperature sensor has fallen off, the defrost temperature sensor detection method provided in this embodiment will further take measures, including the following steps:

[0042] If it is determined that the defrost temperature sensor has fallen, an alarm will be sounded and the number of alarms will be accumulated D;

[0043] If the accumulated alarm times D is greater than or equal to the fifth preset value n3, an alarm is sounded after shutdown and the accumulated shutdown times E are calculated; if the accumulated alarm times D is less than the fifth preset value n3, it is re-determined whether the compressor is running, wherein the fifth preset value n3 can be flexibly selected by those skilled in the art according to actual needs;

[0044] If the cumulative number of shutdowns E is less than the sixth preset value n4, the compressor is reset and restarted after the second preset time t3; if the cumulative number of shutdowns E is greater than or equal to the sixth preset value n4, a forced shutdown is performed. Among them, the sixth preset value n4 can be flexibly selected by technicians in this field according to actual needs. At this time, it is prompted that the defrost temperature sensor has fallen, the shutdown cannot be started, and automatic reset is not allowed. Manual power-off reset is required, so as to force the user to troubleshoot or report after-sales repair.

[0045] The defrost temperature sensor detection method provided in this embodiment stops the compressor as appropriate according to the situation of the defrost temperature sensor falling, so as to avoid the increase of frost thickness on the heat exchanger, which seriously affects the heating performance of the air conditioner and avoids damage to the compressor of the air conditioner.

[0046] As another aspect of the present invention, an air conditioner is provided, which has a heating condition and a defrost mode under the heating condition. In the defrost mode, whether the defrost temperature sensor is detached is detected by the above-mentioned defrost temperature sensor detection method.

[0047] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modification that does not deviate from the functional and structural principles of the present invention will be included in the scope of the claims.

Claims

1. A defrost temperature sensor detection method, used to detect whether the defrost temperature sensor in an air conditioner is detached, characterized in that: The defrost temperature sensor detection method comprises the following steps: Compressor detection: determine whether the compressor is running. If the compressor is running, obtain the pressure value of the low-pressure gas in the compressor suction pipe and its corresponding saturation temperature; Working state detection: determine whether the air conditioner is in heating condition, if yes, perform first cycle detection, if no, perform second cycle detection; First cycle detection: determine whether conditions one, two and four are met in turn. If any one of them is no, re-determine whether the compressor is running. If all are yes, it is determined that the defrost temperature sensor has fallen; the condition one is that the defrost temperature is greater than the sum of the saturation temperature and the first preset value, the condition two is that the defrost temperature is greater than the difference between the ambient temperature and the second preset value, and the condition four is that the cumulative number of times that the conditions one and two are met at the same time increases by one and is greater than or equal to the third preset value; Second cycle detection: determine in sequence whether the air conditioner is in defrost mode and whether the defrost temperature rise value after the preset time meets condition three. If any one of them is no, re-determine whether the compressor is running. If both are yes, it is determined that the defrost temperature sensor has fallen off. The third condition is that the rising value of the defrost temperature is less than or equal to the fourth preset value.

2. The defrost temperature sensor detection method according to claim 1, characterized in that: In the compressor detection step, if the compressor is running, the pressure value of the low-pressure gas in the compressor suction pipe and its corresponding saturation temperature are obtained after a first preset time.

3. The defrost temperature sensor detection method according to claim 1 or 2, characterized in that: When it is determined that the defrost temperature sensor has fallen, the compressor is turned off.

4. The defrost temperature sensor detection method according to claim 3, characterized in that: When the compressor is turned off for a period of time greater than or equal to a second preset time, the compressor is turned on.

5. The defrosting temperature sensor detection method according to claim 4, characterized in that: The defrost temperature sensor detection method also includes the following steps: If it is determined that the defrost temperature sensor has fallen, an alarm will be issued and the number of alarms will be accumulated.

6. The defrost temperature sensor detection method according to claim 5, characterized in that: If the accumulated alarm times are greater than or equal to the fifth preset value, an alarm is triggered after shutdown and the shutdown times are accumulated; if the accumulated alarm times are less than the fifth preset value, it is re-determined whether the compressor is running.

7. The defrost temperature sensor detection method according to claim 6, characterized in that: If the accumulated number of shutdowns is less than the sixth preset value, the compressor is reset and restarted after the second preset time; if the accumulated number of shutdowns is greater than or equal to the sixth preset value, a forced shutdown is performed.

8. An air conditioner having a heating mode, wherein the heating mode has a defrosting mode, characterized in that: In the defrost mode, whether the defrost temperature sensor is detached is detected by the defrost temperature sensor detection method according to any one of claims 1 to 7.

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