阅读说明：本技术 阀门截止保护的控制方法、装置、控制器和空调 (Control method and device for valve cut-off protection, controller and air conditioner ) 是由 赵军猛 罗永前 陈圣文 黄杰 刘慧� 缪万磊 于 2021-07-23 设计创作，主要内容包括：本申请涉及一种阀门截止保护的控制方法、装置、控制器和空调。在空调开机运行一定时间后,判断是否满足针对阀门截止进行判断的第一预设条件,如果满足,则控制空调停机一定时间后再次开机,并在运行一定时间重新判断是否满足针对阀门截止确定阀门出现截止异常的第二预设条件,如果再次满足,则确定阀门出现截止异常,因此触发相应的阀门截止保护。其中,如果空调是制热运行,则进行的判断包括判断AC电流是否过小或压缩机外侧顶部温度与排气温度的差值过大。如此设置,可以对阀门截止的情况进行准确检测、判断和停机控制,避免系统在该状态下持续运行出现故障,并且进行多次判断从而可以避免出现误判。因此,通过上述方案可以提高空调的可靠性。(The application relates to a control method and device for valve stop protection, a controller and an air conditioner. After the air conditioner is started and operates for a certain time, judging whether a first preset condition for judging the valve stop is met, if so, controlling the air conditioner to be stopped for a certain time and then started again, and judging whether a second preset condition for determining the valve stop abnormal condition for the valve stop is met again after operating for a certain time, if so, determining the valve stop abnormal condition, and thus triggering corresponding valve stop protection. Wherein, if the air conditioner is in heating operation, the determination includes determining whether the AC current is too small or whether the difference between the outside top temperature of the compressor and the discharge temperature is too large. So set up, can carry out accurate detection, judgement and shutdown control to the condition that the valve is stopped, avoid the system to keep on operating under this state and break down to thereby carry out many times and judge and can avoid appearing the erroneous judgement. Therefore, the reliability of the air conditioner can be improved through the scheme.)

1. A method of controlling valve shut-off protection, comprising:

after the air conditioner is started and runs for a first preset time, judging whether a first preset condition is met; wherein, if the current working condition is a heating working condition, the first preset condition at least comprises: the AC current exceeds a preset current range or the difference value of the temperature of the top of the outer side of the compressor and the exhaust temperature of the compressor exceeds a first preset temperature range;

if the first preset condition is met, controlling the air conditioner to be shut down for a second preset time and then to be started again, and judging whether the second preset condition is met or not after running for a third preset time; wherein the second preset condition at least comprises: the AC current exceeds a preset current range or the difference value of the temperature of the top of the outer side of the compressor and the exhaust temperature of the compressor exceeds a first preset temperature range;

and if the second preset condition is met, triggering a valve to stop protection and controlling the air conditioner to stop.

2. The method of claim 1, further comprising:

if the second preset condition is not met, the number of times of obtaining module current protection sent by the air conditioner reaches a first preset number of times or the number of times of air conditioner starting failure reaches a second preset number of times, triggering a valve to stop protection and controlling the air conditioner to stop.

3. The method according to claim 1, wherein if the current operating condition is a heating operating condition, the first preset condition further comprises: the current indoor environment temperature and the outdoor environment temperature are located in a preset temperature range corresponding to a heating working condition, the difference between the outdoor environment temperature and the tube wall temperature of the outdoor heat exchanger at the starting time is less than or equal to a first preset temperature, the running frequency of a current compressor is greater than or equal to a first preset frequency, the difference between the current indoor environment temperature and the tube wall temperature of the indoor heat exchanger at the starting time is less than or equal to a second preset temperature, and the difference between the current tube wall temperature of the indoor heat exchanger and the tube wall temperature of the indoor heat exchanger is less than or equal to a third preset temperature;

if the current working condition is a refrigeration working condition, the first preset condition comprises: the current indoor environment temperature and the outdoor environment temperature are located in a preset temperature range corresponding to a refrigeration working condition, the difference between the outdoor environment temperature and the tube wall temperature of the outdoor heat exchanger at the starting-up time is less than or equal to a fourth preset temperature, the running frequency of the current compressor is greater than or equal to a third preset frequency, the difference between the current indoor environment temperature and the tube wall temperature of the indoor heat exchanger at the starting-up time is less than or equal to a fifth preset temperature, and the difference between the current tube wall temperature of the indoor heat exchanger and the tube wall temperature of the indoor heat exchanger is less than or equal to a sixth preset temperature; wherein the third preset frequency is less than the first preset frequency.

4. The method according to claim 3, wherein if the current operating condition is a heating operating condition, the second preset condition further comprises: the current indoor environment temperature and the outdoor environment temperature are located in a preset temperature range corresponding to a heating working condition, the operating frequency of a current compressor is greater than or equal to a second preset frequency, the difference between the current indoor environment temperature and the indoor environment temperature at the starting time is less than or equal to a second preset temperature, and the difference between the current indoor heat exchanger tube wall temperature and the indoor environment temperature is less than or equal to a third preset temperature; wherein the second preset frequency is less than the first preset frequency;

if the current working condition is a refrigeration working condition, the second preset condition comprises: the current indoor environment temperature and the outdoor environment temperature are located in a preset temperature range corresponding to the refrigeration working condition, the running frequency of the current compressor is larger than or equal to a third preset frequency, the difference between the current indoor environment temperature and the indoor environment temperature at the starting-up time is smaller than or equal to a fifth preset temperature, and the difference between the current indoor heat exchanger tube wall temperature and the indoor environment temperature is smaller than or equal to a sixth preset temperature.

5. The method according to claim 3, wherein the first preset condition is determined to be satisfied only when each of the first preset conditions is satisfied.

6. The method according to claim 4, wherein the second preset condition is determined to be satisfied only when each of the second preset conditions is satisfied.

7. The method of any one of claims 1-6, further comprising:

after the valve is triggered to stop protection, the air conditioner is controlled to send out a specific alarm signal.

8. The method of claim 7, wherein said issuing a specific alarm signal after triggering valve cutoff protection comprises:

and after triggering the valve to stop protection for a fourth preset time, controlling the air conditioner display to display a preset fault code.

9. A control device for valve shut-off protection, comprising:

the judging module is used for judging whether a first preset condition is met or not after the air conditioner is started to operate for a first preset time; wherein, if the current working condition is a heating working condition, the first preset condition at least comprises: the AC current exceeds a preset current range or the difference value of the temperature of the top of the outer side of the compressor and the exhaust temperature of the compressor exceeds a first preset temperature range;

the control module is used for controlling the air conditioner to be shut down for a second preset time and then to be started again if the first preset condition is met, and judging whether the second preset condition is met or not after running for a third preset time; wherein the second preset condition at least comprises: the AC current exceeds a preset current range or the difference value of the temperature of the top of the outer side of the compressor and the exhaust temperature of the compressor exceeds a first preset temperature range;

and the protection triggering module is used for triggering a valve to stop protection and controlling the air conditioner to stop if the second preset condition is met.

10. The apparatus of claim 9, wherein the protection triggering module is further configured to:

if the second preset condition is not met, the number of times of obtaining module current protection sent by the air conditioner reaches a first preset number of times or the number of times of air conditioner starting failure reaches a second preset number of times, triggering a valve to stop protection and controlling the air conditioner to stop.

11. The apparatus of claim 10, wherein if the current operating condition is a heating operating condition, the first preset condition further comprises: the current indoor environment temperature and the outdoor environment temperature are located in a preset temperature range corresponding to a heating working condition, the difference between the outdoor environment temperature and the tube wall temperature of the outdoor heat exchanger at the starting time is less than or equal to a first preset temperature, the running frequency of a current compressor is greater than or equal to a first preset frequency, the difference between the current indoor environment temperature and the tube wall temperature of the indoor heat exchanger at the starting time is less than or equal to a second preset temperature, and the difference between the current tube wall temperature of the indoor heat exchanger and the tube wall temperature of the indoor heat exchanger is less than or equal to a third preset temperature;

if the current working condition is a refrigeration working condition, the first preset condition comprises: the current indoor environment temperature and the outdoor environment temperature are located in a preset temperature range corresponding to a refrigeration working condition, the difference between the outdoor environment temperature and the tube wall temperature of the outdoor heat exchanger at the starting-up time is less than or equal to a fourth preset temperature, the running frequency of the current compressor is greater than or equal to a third preset frequency, the difference between the current indoor environment temperature and the tube wall temperature of the indoor heat exchanger at the starting-up time is less than or equal to a fifth preset temperature, and the difference between the current tube wall temperature of the indoor heat exchanger and the tube wall temperature of the indoor heat exchanger is less than or equal to a sixth preset temperature; wherein the third preset frequency is less than the first preset frequency.

12. The apparatus of claim 11, wherein if the current operating condition is a heating operating condition, the second preset condition further comprises: the current indoor environment temperature and the outdoor environment temperature are located in a preset temperature range corresponding to a heating working condition, the operating frequency of a current compressor is greater than or equal to a second preset frequency, the difference between the current indoor environment temperature and the indoor environment temperature at the starting time is less than or equal to a second preset temperature, and the difference between the current indoor heat exchanger tube wall temperature and the indoor environment temperature is less than or equal to a third preset temperature; wherein the second preset frequency is less than the first preset frequency;

if the current working condition is a refrigeration working condition, the second preset condition comprises: the current indoor environment temperature and the outdoor environment temperature are located in a preset temperature range corresponding to the refrigeration working condition, the running frequency of the current compressor is larger than or equal to a third preset frequency, the difference between the current indoor environment temperature and the indoor environment temperature at the starting-up time is smaller than or equal to a fifth preset temperature, and the difference between the current indoor heat exchanger tube wall temperature and the indoor environment temperature is smaller than or equal to a sixth preset temperature.

13. The apparatus of claim 11, wherein the determining module determines that the first preset condition is satisfied only when each of the first preset conditions is satisfied when determining whether the first preset condition is satisfied.

14. The apparatus of claim 12, wherein the determining module determines that the second preset condition is satisfied only when each of the second preset conditions is satisfied when determining whether the second preset condition is satisfied.

15. The apparatus of any one of claims 9-14, further comprising:

and the alarm module is used for controlling the air conditioner to send out a specific alarm signal after triggering the valve stop protection.

16. The apparatus of claim 15, wherein the alarm module comprises:

and the alarm unit is used for controlling the air conditioner display to display a preset fault code after triggering the valve stop protection for a third preset time.

17. A controller of an air conditioner, comprising:

a memory and a processor coupled to the memory;

the memory is used for storing a program for implementing at least a control method of valve cutoff protection according to any one of claims 1 to 8;

the processor is used for calling and executing the program stored in the memory.

18. An air conditioner characterized in that a controller of the air conditioner as claimed in claim 17 is provided.

Technical Field

The application relates to the technical field of air conditioners, in particular to a control method and device for valve cut-off protection, a controller and an air conditioner.

Background

During after-sale installation of the air conditioner or after maintenance, the situation that the valve of the outdoor unit is not opened may occur, and once the system operates without opening the valve, the refrigerant cannot circulate normally, so that the compressor idles or has a large load, and further the compressor explodes or is demagnetized due to an excessively high temperature, thereby affecting the system and personal safety and causing after-sale complaints. However, the existing air conditioning program does not have logic for judging and controlling the situation, and the air conditioning structure design does not have a component for preventing the phenomenon, so a solution is urgently needed to prevent the air conditioning system from operating under the condition that the valve is not opened.

Disclosure of Invention

The application provides a control method and device for valve stop protection, a controller and an air conditioner, and aims to solve the problem that the large and small valves of an external unit are not opened in the after-sales installation process or after maintenance of the air conditioner, so that the system is abnormal in operation.

The above object of the present application is achieved by the following technical solutions:

in a first aspect, an embodiment of the present application provides a method for controlling valve cut-off protection, including:

after the air conditioner is started and runs for a first preset time, judging whether a first preset condition is met; wherein, if the current working condition is a heating working condition, the first preset condition at least comprises: the AC current exceeds a preset current range or the difference value of the temperature of the top of the outer side of the compressor and the exhaust temperature of the compressor exceeds a first preset temperature range;

if the first preset condition is met, controlling the air conditioner to be shut down for a second preset time and then to be started again, and judging whether the second preset condition is met or not after running for a third preset time; wherein the second preset condition at least comprises: the AC current exceeds a preset current range or the difference value of the temperature of the top of the outer side of the compressor and the exhaust temperature of the compressor exceeds a first preset temperature range;

and if the second preset condition is met, triggering a valve to stop protection and controlling the air conditioner to stop.

Optionally, the method further includes:

if the second preset condition is not met, the number of times of obtaining module current protection sent by the air conditioner reaches a first preset number of times or the number of times of air conditioner starting failure reaches a second preset number of times, triggering a valve to stop protection and controlling the air conditioner to stop.

Optionally, if the current working condition is a heating working condition, the first preset condition further includes: the current indoor environment temperature and the outdoor environment temperature are located in a preset temperature range corresponding to a heating working condition, the difference between the outdoor environment temperature and the tube wall temperature of the outdoor heat exchanger at the starting time is less than or equal to a first preset temperature, the running frequency of a current compressor is greater than or equal to a first preset frequency, the difference between the current indoor environment temperature and the tube wall temperature of the indoor heat exchanger at the starting time is less than or equal to a second preset temperature, and the difference between the current tube wall temperature of the indoor heat exchanger and the tube wall temperature of the indoor heat exchanger is less than or equal to a third preset temperature;

if the current working condition is a refrigeration working condition, the first preset condition comprises: the current indoor environment temperature and the outdoor environment temperature are located in a preset temperature range corresponding to a refrigeration working condition, the difference between the outdoor environment temperature and the tube wall temperature of the outdoor heat exchanger at the starting-up time is less than or equal to a fourth preset temperature, the running frequency of the current compressor is greater than or equal to a third preset frequency, the difference between the current indoor environment temperature and the tube wall temperature of the indoor heat exchanger at the starting-up time is less than or equal to a fifth preset temperature, and the difference between the current tube wall temperature of the indoor heat exchanger and the tube wall temperature of the indoor heat exchanger is less than or equal to a sixth preset temperature; wherein the third preset frequency is less than the first preset frequency.

Optionally, if the current working condition is a heating working condition, the second preset condition further includes: the current indoor environment temperature and the outdoor environment temperature are located in a preset temperature range corresponding to a heating working condition, the operating frequency of a current compressor is greater than or equal to a second preset frequency, the difference between the current indoor environment temperature and the indoor environment temperature at the starting time is less than or equal to a second preset temperature, and the difference between the current indoor heat exchanger tube wall temperature and the indoor environment temperature is less than or equal to a third preset temperature; wherein the second preset frequency is less than the first preset frequency;

if the current working condition is a refrigeration working condition, the second preset condition comprises: the current indoor environment temperature and the outdoor environment temperature are located in a preset temperature range corresponding to the refrigeration working condition, the running frequency of the current compressor is larger than or equal to a third preset frequency, the difference between the current indoor environment temperature and the indoor environment temperature at the starting-up time is smaller than or equal to a fifth preset temperature, and the difference between the current indoor heat exchanger tube wall temperature and the indoor environment temperature is smaller than or equal to a sixth preset temperature.

Optionally, it is determined that the first preset condition is met only when each condition in the first preset condition is met.

Optionally, it is determined that the second preset condition is met only when each condition in the second preset condition is met.

Optionally, the method further includes:

after the valve is triggered to stop protection, the air conditioner is controlled to send out a specific alarm signal.

Optionally, after triggering the valve cutoff protection, sending a specific alarm signal includes:

and after triggering the valve to stop protection for a fourth preset time, controlling the air conditioner display to display a preset fault code.

In a second aspect, an embodiment of the present application further provides a control device for valve cut-off protection, which includes:

the judging module is used for judging whether a first preset condition is met or not after the air conditioner is started to operate for a first preset time; wherein, if the current working condition is a heating working condition, the first preset condition at least comprises: the AC current exceeds a preset current range or the difference value of the temperature of the top of the outer side of the compressor and the exhaust temperature of the compressor exceeds a first preset temperature range;

the control module is used for controlling the air conditioner to be shut down for a second preset time and then to be started again if the first preset condition is met, and judging whether the second preset condition is met or not after running for a third preset time; wherein the second preset condition at least comprises: the AC current exceeds a preset current range or the difference value of the temperature of the top of the outer side of the compressor and the exhaust temperature of the compressor exceeds a first preset temperature range;

and the protection triggering module is used for triggering a valve to stop protection and controlling the air conditioner to stop if the second preset condition is met.

Optionally, the protection triggering module is further configured to:

if the second preset condition is not met, the number of times of obtaining module current protection sent by the air conditioner reaches a first preset number of times or the number of times of air conditioner starting failure reaches a second preset number of times, triggering a valve to stop protection and controlling the air conditioner to stop.

Optionally, if the current working condition is a heating working condition, the first preset condition further includes: the current indoor environment temperature and the outdoor environment temperature are located in a preset temperature range corresponding to a heating working condition, the difference between the outdoor environment temperature and the tube wall temperature of the outdoor heat exchanger at the starting time is less than or equal to a first preset temperature, the running frequency of a current compressor is greater than or equal to a first preset frequency, the difference between the current indoor environment temperature and the tube wall temperature of the indoor heat exchanger at the starting time is less than or equal to a second preset temperature, and the difference between the current tube wall temperature of the indoor heat exchanger and the tube wall temperature of the indoor heat exchanger is less than or equal to a third preset temperature;

if the current working condition is a refrigeration working condition, the first preset condition comprises: the current indoor environment temperature and the outdoor environment temperature are located in a preset temperature range corresponding to a refrigeration working condition, the difference between the outdoor environment temperature and the tube wall temperature of the outdoor heat exchanger at the starting-up time is less than or equal to a fourth preset temperature, the running frequency of the current compressor is greater than or equal to a third preset frequency, the difference between the current indoor environment temperature and the tube wall temperature of the indoor heat exchanger at the starting-up time is less than or equal to a fifth preset temperature, and the difference between the current tube wall temperature of the indoor heat exchanger and the tube wall temperature of the indoor heat exchanger is less than or equal to a sixth preset temperature; wherein the third preset frequency is less than the first preset frequency.

Optionally, if the current working condition is a heating working condition, the second preset condition further includes: the current indoor environment temperature and the outdoor environment temperature are located in a preset temperature range corresponding to a heating working condition, the operating frequency of a current compressor is greater than or equal to a second preset frequency, the difference between the current indoor environment temperature and the indoor environment temperature at the starting time is less than or equal to a second preset temperature, and the difference between the current indoor heat exchanger tube wall temperature and the indoor environment temperature is less than or equal to a third preset temperature; wherein the second preset frequency is less than the first preset frequency;

if the current working condition is a refrigeration working condition, the second preset condition comprises: the current indoor environment temperature and the outdoor environment temperature are located in a preset temperature range corresponding to the refrigeration working condition, the running frequency of the current compressor is larger than or equal to a third preset frequency, the difference between the current indoor environment temperature and the indoor environment temperature at the starting-up time is smaller than or equal to a fifth preset temperature, and the difference between the current indoor heat exchanger tube wall temperature and the indoor environment temperature is smaller than or equal to a sixth preset temperature.

Optionally, when determining whether a first preset condition is met, the determining module determines that the first preset condition is met only when each condition in the first preset condition is met.

Optionally, when determining whether a second preset condition is met, the determining module determines that the second preset condition is met only when each condition in the second preset condition is met.

Optionally, the apparatus further comprises:

and the alarm module is used for controlling the air conditioner to send out a specific alarm signal after triggering the valve stop protection.

Optionally, the alarm module includes:

and the alarm unit is used for controlling the air conditioner display to display a preset fault code after triggering the valve stop protection for a third preset time.

In a third aspect, an embodiment of the present application further provides a controller of an air conditioner, including:

a memory and a processor coupled to the memory;

the memory is used for storing a program at least for implementing the control method of valve cut-off protection according to any one of the first aspect;

the processor is used for calling and executing the program stored in the memory.

In a fourth aspect, embodiments of the present application further provide an air conditioner, which is provided with the controller of the air conditioner as described in the third aspect.

The technical scheme provided by the embodiment of the application can have the following beneficial effects:

according to the technical scheme, after the air conditioner is started and operates for a certain time, whether a first preset condition for judging the valve cut-off (namely, not opened) is met or not is judged, if yes, the air conditioner is controlled to be stopped for a certain time and then started again, whether a second preset condition for determining the valve cut-off abnormity is met or not is judged again after the air conditioner operates for a certain time, and if yes, the valve is determined to have the cut-off abnormity, so that corresponding valve cut-off protection is triggered. Wherein, if the air conditioner is in heating operation, the determination includes determining whether the AC current is too small or whether the difference between the outside top temperature of the compressor and the discharge temperature is too large. So set up, can carry out accurate detection, judgement and shutdown control to the condition that the valve is stopped, avoid the system to keep on operating under this state and break down to thereby carry out many times and judge and can avoid appearing the erroneous judgement. Therefore, the reliability of the air conditioner can be improved through the scheme.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.

Fig. 1 is a schematic flow chart of a control method for valve cut-off protection according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a control device for valve cut-off protection according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of a controller of an air conditioner according to an embodiment of the present application.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

In order to solve the above problems mentioned in the background art and avoid system failure and damage caused by long-time operation of the air conditioner under the condition that the valve is closed (not opened), the application provides a control method and device for valve closing protection, a controller and the air conditioner, and whether the air conditioner has abnormal valve closing or not is judged by detecting the operation parameters of the air conditioner. The details of the embodiment are described below by way of examples.

Examples

Referring to fig. 1, fig. 1 is a schematic flow chart of a control method for valve cut-off protection according to an embodiment of the present disclosure.

As shown in fig. 1, the method comprises at least the following steps:

s101: after the air conditioner is started and runs for a first preset time, judging whether a first preset condition is met;

specifically, the purpose of setting the first preset condition is to determine whether the valve is cut off abnormally, for example, whether the valve is forgotten to be opened in the after-sales installation process of the air conditioner, wherein the idea of the determination of this embodiment is to detect an actual operation parameter of the air conditioner, and determine whether the valve is opened by comparing whether the actual operation parameter is within a normal parameter range in a normal operation state (i.e., a normal opening state of the valve) of the air conditioner. Further, the first preset time may be, for example, 3 minutes.

Based on this, in some embodiments, based on different working conditions (a heating working condition (i) and a cooling working condition (ii)), the feasible scheme of the first preset condition is as follows:

if the current working condition is a heating working condition, the first preset condition at least comprises the following steps: the AC current exceeds a preset current range or the difference value of the temperature of the top of the outer side of the compressor and the exhaust temperature of the compressor exceeds a first preset temperature range; and, the first preset condition may further include: the current indoor environment temperature and the outdoor environment temperature are located in a preset temperature range corresponding to a heating working condition, the difference between the outdoor environment temperature and the tube wall temperature of the outdoor heat exchanger at the starting time is less than or equal to a first preset temperature, the running frequency of a current compressor is greater than or equal to a first preset frequency, the difference between the current indoor environment temperature and the tube wall temperature of the indoor heat exchanger at the starting time is less than or equal to a second preset temperature, and the difference between the current tube wall temperature of the indoor heat exchanger and the tube wall temperature of the indoor heat exchanger is less than or equal to a third preset temperature;

the current indoor environment temperature and the outdoor environment temperature are located in a preset temperature range (the temperature range can be 3-22 ℃ for example) corresponding to the heating working condition, the system is currently located in the heating working condition, the judgment of the condition is to determine the current operating working condition, and then other judgment conditions corresponding to the current working condition are determined; when the air conditioner is started, the difference between the outdoor environment temperature and the tube wall temperature of the outdoor heat exchanger is less than or equal to a first preset temperature (the first preset temperature can be 1.5 ℃ for example), which indicates that the air conditioner is started after standing for a period of time, and the judgment condition is to eliminate the influence of the last operation on the current operation parameters of the air conditioner caused by the short shutdown time, namely, to avoid misjudgment by mistake; the operation frequency of the current compressor is greater than or equal to a first preset frequency (the first preset frequency can be taken from a range of 34-37 Hz, and specifically can be set by referring to a normal-temperature heating lower limit frequency), which indicates that the frequency of the current compressor is higher than the frequency of the system in normal operation under the current working condition, that is, the compressor is in an overhigh frequency state, and the reason may be that the system state cannot meet the requirements of the current working condition because a valve is not opened, so the compressor has to operate at a high frequency to meet the requirements; the difference between the current indoor environment temperature and the indoor environment temperature at the starting-up time is less than or equal to a second preset temperature (the second preset temperature can be taken from the range of 1.5-3 ℃ for example), which indicates that the indoor environment temperature cannot be effectively changed after the air conditioner runs for a period of time, and the reason may be that a valve is not opened; the difference between the wall temperature of the current indoor heat exchanger and the indoor environment temperature is less than or equal to a third preset temperature (the third preset temperature can be taken from the range of 1.5-3 ℃ for example), that is, the difference between the wall temperature of the current indoor heat exchanger and the indoor environment temperature is small, which indicates that the heat exchanger cannot realize effective heat exchange, and the reason may be that a valve is not opened.

By the above judgment conditions, whether the valve is opened or not can be reflected from the side surface to a certain extent. However, in practical applications, the determination may not be made only by the above-listed conditions, but rather, conditions and parameters that can reasonably reflect the abnormal state when the valve is not opened are all possible.

In addition, based on the above conditions, through research, the inventors found that in practical applications, generally, the required temperature parameters are obtained through the thermal bulb arranged at the corresponding position, and are affected by the sensitivity of the thermal bulb itself and other reasons, so that the error of the obtained temperature parameters is relatively large, and based on the error, erroneous judgment may occur; in addition, in practical application, if the air conditioner is started for multiple times in a short time during installation and maintenance, a large error may also occur in the above-mentioned partial conditions, for example, due to multiple times of starting, the difference between the wall temperature of the indoor heat exchanger and the indoor environment temperature may be larger than theoretically, and the possibility of erroneous judgment may further increase when the judgment is performed through the conditions.

Based on this, the present embodiment also collects AC current as a judgment condition or uses the difference between the outside top temperature of the compressor and the discharge temperature of the compressor as a judgment condition. The AC current means that a non-inductive resistance sensor with a small resistance value is added on an outer unit main board of the variable frequency air conditioner and is used for detecting the AC current behind an outer unit rectifier bridge circuit, and the AC current is the detection precision of the whole machine. When the system normally operates, the AC current is stabilized within a certain range (for example, 1.5-2A, the specific value can be determined according to the current compensation value under the heating working condition), and if the valve is not opened, the AC current is obviously changed (for example, less than 1.5A). In addition, to compressor outside top temperature and compressor exhaust temperature, can obtain through setting up the thermal bulb at compressor blast pipe and compressor top respectively, two thermal bulbs's the principle of setting up is: the exhaust temperature sensing bulb is arranged on the horizontal section of the exhaust pipe, the compressor top temperature sensing bulb is arranged on the top of the compressor, the two wings can be welded to the compressor and then painted, or a groove for placing the temperature sensing bulb is directly recessed in the compressor top.

Thus, since the detection error of the electric signal is small relative to the temperature detection error, erroneous determination can be effectively avoided by detecting the AC current as the determination condition. For the top temperature outside the compressor (for short, the capping temperature) and the exhaust temperature of the compressor, when the valve is opened and the system normally operates, the difference between the capping temperature and the exhaust temperature changes within a first preset temperature range (for example, within a range of 20 to 30 ℃, the specific value depends on the actual compressor and the external machine), but if the valve is not opened and the system does not normally operate, the difference is obviously increased (for example, 30 to 40 ℃ may be reached, the specific value depends on the actual compressor and the external machine), that is, whether the valve is opened or not, the difference between the capping temperature and the exhaust temperature is large and obviously larger than the detection error of the temperature sensing package, so that when the judgment is carried out through the condition, the misjudgment can also be effectively avoided.

It should be noted that, based on the above conditions, if only a single condition is determined as "yes", that is, if the valve is determined not to be opened, a false determination may also occur, for example, the reason why the difference between the current indoor heat exchanger tube wall temperature and the indoor environment temperature is less than or equal to the third preset temperature "may not be that the valve is not opened, and therefore, as a preferred embodiment, it is determined that the first preset condition is satisfied only when each of the first preset conditions is satisfied. By the arrangement, the misjudgment can be further avoided. And when the first preset condition comprises a plurality of conditions, the sequence of judging the conditions is not required to be limited.

If the current working condition is a refrigeration working condition, the first preset condition comprises: the current indoor environment temperature and the outdoor environment temperature are located in a preset temperature range corresponding to a refrigeration working condition, the difference between the outdoor environment temperature and the tube wall temperature of the outdoor heat exchanger at the starting-up time is less than or equal to a fourth preset temperature, the running frequency of the current compressor is greater than or equal to a third preset frequency, the difference between the current indoor environment temperature and the tube wall temperature of the indoor heat exchanger at the starting-up time is less than or equal to a fifth preset temperature, and the difference between the current tube wall temperature of the indoor heat exchanger and the tube wall temperature of the indoor heat exchanger is less than or equal to a sixth preset temperature; wherein the third preset frequency is less than the first preset frequency.

Specifically, the principle of judgment of the refrigeration condition is similar to the heating condition, but the actual parameter is different from the heating condition, so that adaptive adjustment needs to be performed on part of the preset parameters, for example, the preset temperature range corresponding to the refrigeration condition may be 12 to 40 ℃, the fourth preset temperature may be 1.5 ℃, the third preset frequency may be about 30Hz, and the fifth preset temperature and the sixth preset temperature may be selected from the range of 1.5 to 3 ℃. In addition, whether the valve is opened can be well determined without judging whether the AC current meets the condition under the refrigeration working condition.

S102: if the first preset condition is met, controlling the air conditioner to be shut down for a second preset time and then to be started again, and judging whether the second preset condition is met or not after running for a third preset time;

as a possible embodiment, the second preset condition is as follows:

if the current working condition is a heating working condition, the second preset condition at least comprises the following steps: the AC current exceeds a preset current range or the difference value of the temperature of the top of the outer side of the compressor and the exhaust temperature of the compressor exceeds a first preset temperature range; and, the second preset condition may further include: the current indoor environment temperature and the outdoor environment temperature are located in a preset temperature range corresponding to a heating working condition, the operating frequency of a current compressor is greater than or equal to a second preset frequency, the difference between the current indoor environment temperature and the indoor environment temperature at the starting time is less than or equal to a second preset temperature, and the difference between the current indoor heat exchanger tube wall temperature and the indoor environment temperature is less than or equal to a third preset temperature; wherein the second preset frequency is less than the first preset frequency;

if the current working condition is a refrigeration working condition, the second preset condition may include: the current indoor environment temperature and the outdoor environment temperature are located in a preset temperature range corresponding to the refrigeration working condition, the running frequency of the current compressor is larger than or equal to a third preset frequency, the difference between the current indoor environment temperature and the indoor environment temperature at the starting-up time is smaller than or equal to a fifth preset temperature, and the difference between the current indoor heat exchanger tube wall temperature and the indoor environment temperature is smaller than or equal to a sixth preset temperature.

Specifically, the second preset condition is similar to the first preset condition, that is, the judgment principle is similar, however, since the air conditioner is controlled to stop for the second preset time, the condition for judging whether the air conditioner is started after standing for a period of time, namely the difference between the outdoor environment temperature at the starting time and the tube wall temperature of the outdoor heat exchanger, is less than or equal to the first preset temperature, can be cancelled. Meanwhile, due to the air conditioner, in the heating condition, the frequency of the compressor may be reduced after the compressor is started for the second time, so that the set second preset frequency is smaller than the first preset frequency, that is, the correction coefficient is added to the frequency judgment condition, and the frequency range is reduced. The frequency correction coefficient may be, for example, 3 to 4Hz, i.e., the second predetermined frequency is reduced by 3 to 4Hz relative to the first predetermined frequency. However, for the refrigeration condition, the second preset condition is relative to the first preset condition, and the third preset frequency does not need to be corrected.

The air conditioner is controlled to be started and judged again after being stopped for a period of time, namely secondary judgment confirmation, so that misjudgment can be further avoided.

Further, similar to the judgment process of the first preset condition, as a preferred embodiment, it is determined that the second preset condition is satisfied only when each condition in the second preset condition is satisfied, so as to avoid erroneous judgment.

S103: and if the second preset condition is met, triggering a valve to stop protection and controlling the air conditioner to stop.

Specifically, if the second preset condition is met, that is, both the two determinations meet the corresponding conditions, it may be determined that the valve is not opened, that is, in a cut-off state, and therefore, the corresponding valve cut-off protection may be triggered, the air conditioner is controlled to stop, and the protection of the air conditioning system is realized.

According to the technical scheme, after the air conditioner is started and operates for a certain time, whether a first preset condition for judging the valve stop is met or not is judged, if yes, the air conditioner is controlled to be stopped and started again after the air conditioner is operated for a certain time, whether a second preset condition for determining the valve stop abnormal stop is met or not is judged again after the air conditioner operates for a certain time, if yes, the valve is determined to be abnormal stop, and therefore corresponding valve stop protection is triggered. Wherein, if the air conditioner is in heating operation, the determination includes determining whether the AC current is too small or whether the difference between the outside top temperature of the compressor and the discharge temperature is too large. So set up, can carry out accurate detection, judgement and shutdown control to the condition that the valve is stopped, avoid the system to keep on operating under this state and break down to thereby carry out many times and judge and can avoid appearing the erroneous judgement. Therefore, the reliability of the air conditioner can be improved through the scheme.

Further, in some embodiments, after the determining of step S102, the method further comprises:

if the second preset condition is not met, the number of times of obtaining module current protection sent by the air conditioner reaches a first preset number of times or the number of times of air conditioner starting failure reaches a second preset number of times, triggering a valve to stop protection and controlling the air conditioner to stop.

That is, in the time period before and after the air conditioner is restarted, if the air conditioner triggers the module current protection for the first preset number of times or fails to start for the second preset number of times, it may be determined that the valve is not opened. The first preset number of times may be two times, for example, and the second preset number of times may be three times, for example. In addition, the module current protection refers to a protection signal triggered when an IGBT module in the air conditioning system detects that the current of the compressor is greater than a set value. If the system is operated for a period of time without the valve open, it is possible that the module current is greater than the set point. Similarly, the valve is blocked to cause the pressure imbalance of the system, so that the load is overlarge when the compressor is started, and the electromagnetic force generated by the starting current is not enough to drive the rotor to stably move under high load, so that the starting failure can be caused. The expression form of the compressor starting failure on the whole machine is that under extremely high load, the current detection fluctuation of the rotor positioning and open-loop acceleration links is large, so that the IPM module detects that the instantaneous value is larger than a set value, and at the moment, a protection signal is triggered to the whole machine.

Through the scheme, whether the valve is opened or not can be further judged from other conditions in multiple angles, and the accuracy of judging logic is improved.

It should be noted, however, that the above-mentioned judgment condition based on module current protection or start failure is usually only applicable to the heating condition, and since the frequency of the compressor is lower than that of the heating condition in the cooling condition, the module current is correspondingly reduced, and the problem of excessive module current does not exist basically, so that the judgment of the module current protection condition and the start failure condition is cancelled.

Further, in some embodiments, the method further comprises: after the valve is triggered to stop protection, the air conditioner is controlled to send out a specific alarm signal. Namely, the alarm with specific form and content is sent to the user after the valve stop protection is triggered, so that the user can conveniently overhaul. Further, for example, after triggering the valve cutoff protection for a fourth preset time, the air conditioner display may be controlled to display a preset fault code. The fourth preset time is waiting for determining that the system is not recovered to be normal, and the preset fault code is displayed through the air conditioner display, so that maintenance personnel after sale and the like can conveniently and quickly determine the fault of the air conditioner according to the fault code.

In addition, based on the same inventive concept, the embodiment of the present application further provides a control device for valve cut-off protection, corresponding to the control method for valve cut-off protection provided in the above embodiment. The device is a software-based functional module in a controller for performing the above method.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a control device for valve cut-off protection according to an embodiment of the present application. As shown in fig. 2, the apparatus includes at least:

the judging module 21 is configured to judge whether a first preset condition is met after the air conditioner is started to operate for a first preset time; wherein, if the current working condition is a heating working condition, the first preset condition at least comprises: the AC current exceeds a preset current range or the difference value of the temperature of the top of the outer side of the compressor and the exhaust temperature of the compressor exceeds a first preset temperature range;

the control module 22 is used for controlling the air conditioner to be powered on again after being shut down for a second preset time if the first preset condition is met, and judging whether the second preset condition is met or not after running for a third preset time; wherein the second preset condition at least comprises: the AC current exceeds a preset current range or the difference value of the temperature of the top of the outer side of the compressor and the exhaust temperature of the compressor exceeds a first preset temperature range;

and the protection triggering module 23 is configured to trigger a valve to stop protection and control the air conditioner to stop if the second preset condition is met.

Optionally, the protection triggering module is further configured to:

if the second preset condition is not met, the number of times of obtaining module current protection sent by the air conditioner reaches a first preset number of times or the number of times of air conditioner starting failure reaches a second preset number of times, triggering a valve to stop protection and controlling the air conditioner to stop.

Optionally, if the current working condition is a heating working condition, the first preset condition further includes: the current indoor environment temperature and the outdoor environment temperature are located in a preset temperature range corresponding to a heating working condition, the difference between the outdoor environment temperature and the tube wall temperature of the outdoor heat exchanger at the starting time is less than or equal to a first preset temperature, the running frequency of a current compressor is greater than or equal to a first preset frequency, the difference between the current indoor environment temperature and the tube wall temperature of the indoor heat exchanger at the starting time is less than or equal to a second preset temperature, and the difference between the current tube wall temperature of the indoor heat exchanger and the tube wall temperature of the indoor heat exchanger is less than or equal to a third preset temperature;

if the current working condition is a refrigeration working condition, the first preset condition comprises: the current indoor environment temperature and the outdoor environment temperature are located in a preset temperature range corresponding to a refrigeration working condition, the difference between the outdoor environment temperature and the tube wall temperature of the outdoor heat exchanger at the starting-up time is less than or equal to a fourth preset temperature, the running frequency of the current compressor is greater than or equal to a third preset frequency, the difference between the current indoor environment temperature and the tube wall temperature of the indoor heat exchanger at the starting-up time is less than or equal to a fifth preset temperature, and the difference between the current tube wall temperature of the indoor heat exchanger and the tube wall temperature of the indoor heat exchanger is less than or equal to a sixth preset temperature; wherein the third preset frequency is less than the first preset frequency.

Optionally, if the current working condition is a heating working condition, the second preset condition further includes: the current indoor environment temperature and the outdoor environment temperature are located in a preset temperature range corresponding to a heating working condition, the operating frequency of a current compressor is greater than or equal to a second preset frequency, the difference between the current indoor environment temperature and the indoor environment temperature at the starting time is less than or equal to a second preset temperature, and the difference between the current indoor heat exchanger tube wall temperature and the indoor environment temperature is less than or equal to a third preset temperature; wherein the second preset frequency is less than the first preset frequency;

if the current working condition is a refrigeration working condition, the second preset condition comprises: the current indoor environment temperature and the outdoor environment temperature are located in a preset temperature range corresponding to the refrigeration working condition, the running frequency of the current compressor is larger than or equal to a third preset frequency, the difference between the current indoor environment temperature and the indoor environment temperature at the starting-up time is smaller than or equal to a fifth preset temperature, and the difference between the current indoor heat exchanger tube wall temperature and the indoor environment temperature is smaller than or equal to a sixth preset temperature.

Optionally, when determining whether a first preset condition is met, the determining module determines that the first preset condition is met only when each condition in the first preset condition is met.

Optionally, when determining whether a second preset condition is met, the determining module determines that the second preset condition is met only when each condition in the second preset condition is met.

Optionally, the apparatus further comprises:

and the alarm module is used for controlling the air conditioner to send out a specific alarm signal after triggering the valve stop protection.

Optionally, the alarm module includes:

and the alarm unit is used for controlling the air conditioner display to display a preset fault code after triggering the valve stop protection for a third preset time.

For a specific implementation method of the steps executed by each module in the apparatus, reference may be made to the foregoing method embodiment, which is not described herein again.

Based on the same inventive concept, the embodiment of the present application further provides a controller of an air conditioner corresponding to the control method of the valve cut-off protection provided by the above embodiment.

Referring to fig. 3, fig. 3 is a schematic structural diagram of a controller of an air conditioner according to an embodiment of the present application. As shown in fig. 3, the controller includes a memory 31 and a processor 32 connected to the memory 31; the memory 31 is used for storing a program for implementing at least the control method of the valve cut-off protection described in the foregoing embodiment; the processor 32 is used to call and execute the program stored in the memory 31.

For specific implementation methods of each step of the method implemented by the program, reference may be made to the foregoing method embodiments, and details are not described here again.

In addition, the embodiment of the application also provides an air conditioner, which is provided with the controller of the air conditioner shown in fig. 3. The controller is applied to the air conditioner, and the corresponding control method can be realized.

Through the scheme, the valve stop condition can be accurately detected, judged and shut down controlled, the system is prevented from continuously running and breaking down in the state, and multiple times of judgment are carried out, so that misjudgment can be avoided. Therefore, the reliability of the air conditioner can be improved through the scheme.

It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.

It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present application, the meaning of "a plurality" means at least two unless otherwise specified.

Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and the scope of the preferred embodiments of the present application includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.

It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.

It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.

In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.

The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.

In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.