PID (Proportion Integration Differentiation) control method and device based on variable shunting and air conditioner

Abstract

The invention provides a PID control method and device based on variable shunting and an air conditioner, and is applied to the field of air conditioner control. The method comprises the steps that in the operation process of the air conditioner, whether the current environment temperature meets the limiting temperature condition or not is judged; under the condition that the current environment temperature meets the limiting temperature condition, the target control strategy is executed circularly till the current environment temperature reaches the set temperature; the target control strategy comprises at least one of the following items: performing PID control on the operation frequency of the compressor and the valve opening of the throttle valve, changing the flow dividing mode of the flow divider, and performing PID control on the rotating speed of the fan. According to the PID control method and device based on variable shunting and the air conditioner, through the mode of combining variable shunting and PID control, the air conditioner can maintain the indoor environment temperature within the temperature range set by the user under the severe working conditions of ultra-high temperature and ultra-low temperature.

Description

Technical Field

[0001] The present application relates to the field of air conditioner control, and in particular to a PID control method and device based on variable split and an air conditioner. Background Art

[0002] As people's living standards continue to improve and the level of intelligence of home appliances continues to increase, smart home appliances are becoming more and more popular. Users can use air conditioners for heating in winter to increase the indoor temperature, and can also use air conditioners for cooling in summer to reduce the indoor temperature.

[0003] In the related technology, PID control of air conditioners can be used for temperature control to ensure that the indoor temperature remains near the set value. Proportional control (P) adjusts the cooling or heating power according to the deviation of the current temperature from the set value; integral control (I) adjusts the power according to the cumulative value of the temperature deviation from the set value to eliminate long-term deviations; differential control (D) adjusts the power according to the speed of temperature change to improve the response speed of the system.

[0004] However, due to the harsh working conditions of extremely high temperatures in summer and extremely low temperatures in winter, it is difficult to stabilize the indoor ambient temperature within the temperature range set by the user. Summary of the invention

[0005] The purpose of the present application is to provide a PID control method, device and air conditioner based on variable shunt, which, by combining variable shunt with PID control, enables the air conditioner to maintain the indoor ambient temperature within the temperature range set by the user even under harsh working conditions of ultra-high temperature and ultra-low temperature.

[0006] The present application provides a PID control method based on variable split flow, comprising: During the operation of the air conditioner, determine whether the current ambient temperature meets the limit temperature condition; when the current ambient temperature meets the limit temperature condition, cyclically execute the target control strategy until the current ambient temperature reaches the set temperature; wherein the target control strategy includes at least one of the following: a first control strategy, a second control strategy, and a third control strategy; the first control strategy is: PID control of the compressor operating frequency and the valve opening of the throttle valve to adjust the coil temperature; the second control strategy is: changing the diversion mode of the diverter; the third control strategy is: PID control of the fan speed to adjust the ambient temperature.

[0007] Optionally, during the operation of the air conditioner, the judgment of whether the current ambient temperature meets the extreme temperature condition includes: when the air conditioner is in heating mode, if the current ambient temperature is less than a first temperature threshold, it is determined that the extreme temperature condition is met; or, when the air conditioner is in cooling mode, if the current ambient temperature is greater than a second temperature threshold, it is determined that the extreme temperature condition is met.

[0008] Optionally, when the current ambient temperature meets the limit temperature condition, the target control strategy is cyclically executed until the current ambient temperature reaches the set temperature, including: when the current ambient temperature meets the limit temperature condition, judging whether the current coil temperature meets the standard; if not, cyclically executing the first control strategy until the coil temperature meets the standard.

[0009] Optionally, when the current ambient temperature meets the extreme temperature condition, the target control strategy is executed cyclically until the current ambient temperature reaches the set temperature, including: when the number of times the air conditioner executes the first control strategy reaches a first number threshold, if the coil temperature does not meet the standard, then the second control strategy is executed; after executing the second control strategy for a first preset time, if the coil temperature does not meet the standard, then the first control strategy is executed cyclically until the coil temperature meets the standard.

[0010] Optionally, when the current ambient temperature meets the extreme temperature condition, the target control strategy is executed cyclically until the current ambient temperature reaches the set temperature, including: when the number of times the air conditioner executes the first control strategy is less than or equal to the first number threshold, if the coil temperature meets the standard, it is determined whether the current ambient temperature reaches the set temperature; if the current ambient temperature does not reach the set temperature, the third control strategy is executed cyclically until the current ambient temperature reaches the set temperature.

[0011] Optionally, when the current ambient temperature meets the extreme temperature condition, the target control strategy is executed cyclically until the current ambient temperature reaches the set temperature, including: when the air conditioner executes the third control strategy for a second number threshold, if the current ambient temperature does not reach the set temperature, then the second control strategy is executed; after executing the second control strategy for a second preset time, if the current ambient temperature does not reach the set temperature, then the third control strategy is executed cyclically until the current ambient temperature reaches the set temperature.

[0012] Optionally, when the current ambient temperature meets the extreme temperature condition, the target control strategy is executed cyclically until the current ambient temperature reaches the set temperature, including: when the number of times the air conditioner executes the third control strategy is less than or equal to the second number threshold, if the current ambient temperature reaches the set temperature, then the execution of the third control strategy is stopped.

[0013] The present application also provides a PID control device based on variable split flow, comprising: A judgment module is used to judge whether the current ambient temperature meets the limit temperature condition during the operation of the air conditioner; a control module is used to cyclically execute the target control strategy when the current ambient temperature meets the limit temperature condition until the current ambient temperature reaches the set temperature; wherein the target control strategy includes at least one of the following: a first control strategy, a second control strategy and a third control strategy; the first control strategy is: PID control of the compressor operating frequency and the valve opening of the throttle valve to adjust the coil temperature; the second control strategy is: changing the diversion mode of the diverter; the third control strategy is: PID control of the fan speed to adjust the ambient temperature.

[0014] Optionally, the judgment module is specifically used to determine that the extreme temperature condition is met when the air conditioner is operating in heating mode and the current ambient temperature is less than a first temperature threshold; the judgment module is also specifically used to determine that the extreme temperature condition is met when the air conditioner is operating in cooling mode and the current ambient temperature is greater than a second temperature threshold.

[0015] Optionally, the control module is specifically used to determine whether the current coil temperature meets the standard when the current ambient temperature meets the limit temperature condition. If not, the first control strategy is executed cyclically until the coil temperature meets the standard.

[0016] Optionally, the control module is specifically used to execute the second control strategy if the coil temperature does not meet the standard when the number of times the air conditioner executes the first control strategy reaches a first number threshold; the control module is also specifically used to loop the execution of the first control strategy until the coil temperature meets the standard if the coil temperature does not meet the standard after executing the second control strategy for a first preset time.

[0017] Optionally, the control module is specifically used to determine whether the current ambient temperature reaches the set temperature if the coil temperature meets the standard when the number of times the air conditioner executes the first control strategy is less than or equal to the first number threshold; the control module is also specifically used to loop the execution of the third control strategy until the current ambient temperature reaches the set temperature if the current ambient temperature does not reach the set temperature.

[0018] Optionally, the control module is specifically used to execute the second control strategy when the air conditioner executes the third control strategy for a second number threshold and if the current ambient temperature has not reached the set temperature; the control module is also specifically used to execute the third control strategy in a loop until the current ambient temperature reaches the set temperature after executing the second control strategy for a second preset time period and if the current ambient temperature has not reached the set temperature.

[0019] Optionally, the control module is specifically configured to stop executing the third control strategy if the current ambient temperature reaches a set temperature when the number of times the air conditioner executes the third control strategy is less than or equal to the second number threshold.

[0020] The present application also provides a computer program product, comprising a computer program / instruction, which, when executed by a processor, implements the steps of any of the above-mentioned PID control methods based on variable split.

[0021] The present application also provides an electronic device, which may be an air conditioner, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of any of the variable split-based PID control methods described above are implemented.

[0022] The present application also provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of any of the above-mentioned PID control methods based on variable split are implemented.

[0023] The PID control method, device and air conditioner based on variable shunt provided by the present application, first, during the operation of the air conditioner, determine whether the current ambient temperature meets the limit temperature condition; then, when the current ambient temperature meets the limit temperature condition, cyclically execute the target control strategy until the current ambient temperature reaches the set temperature; wherein, the target control strategy includes at least one of the following: a first control strategy, a second control strategy and a third control strategy; the first control strategy is: PID control of the compressor operating frequency and the valve opening of the throttle valve to adjust the coil temperature; the second control strategy is: changing the shunt mode of the shunt; the third control strategy is: PID control of the fan speed to adjust the ambient temperature. In this way, by combining variable shunt with PID control, the air conditioner can maintain the indoor ambient temperature within the temperature range set by the user even under the harsh working conditions of ultra-high temperature and ultra-low temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the present application or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 It is a structural schematic diagram of the throttling unit and the diverter provided by the present application; Figure 2 It is a structural schematic diagram of an outdoor heat exchanger provided by the present application; Figure 3 It is one of the flow diagrams of the PID control method based on variable split provided in the present application; Figure 4 This is the second flow chart of the PID control method based on variable split provided by the present application; Figure 5 It is a structural schematic diagram of a PID control device based on variable split provided in the present application; Figure 6 It is a structural schematic diagram of the electronic device provided by this application. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0027] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0028] The operating principle of the air conditioner involved in the embodiment of the present application is described in detail below: The compressor compresses the refrigerant (coolant) and transports it to the condenser through a pipeline. The high-temperature and high-pressure gaseous refrigerant releases heat in the condenser and becomes a medium-temperature and high-pressure liquid refrigerant. After that, the medium-temperature and high-pressure liquid refrigerant is depressurized by a capillary tube (throttling unit) and becomes a low-temperature and low-pressure liquid refrigerant. The low-temperature and low-pressure liquid refrigerant is transported to the evaporator to evaporate from liquid to gas, and absorbs a large amount of heat during the evaporation process. Finally, the low-temperature and low-pressure gaseous refrigerant in the evaporator is transported to the compressor to participate in the next cycle. When the air conditioner is cooling, the heat exchanger of the outdoor unit is the condenser, and the heat exchanger of the indoor unit is the evaporator; conversely, when the air conditioner is heating, the heat exchanger of the outdoor unit is the evaporator, and the heat exchanger of the indoor unit is the condenser.

[0029] like Figure 1 The figure shows a schematic diagram of the structure of the throttling unit and the diverter provided in the embodiment of the present application. The diverter can be an integral structure with the throttling unit, or a separate structure. When the supercooling degree of the air conditioner is low, the supercooling degree of the air conditioner can be increased by adjusting the diversion mode of the diverter. The adjustment mode includes: adjusting from single-way diversion to dual-way diversion, or adjusting from dual-way diversion to single-way diversion. Based on Figure 1 ,like Figure 2 As shown, the two diverter pipes (including pipe A and pipe B) of the diverter can be connected to two pipes on the outdoor heat exchanger respectively so that the diverting mode can be adjusted.

[0030] In the related art, it is difficult to stabilize the temperature using the PID algorithm under severe working conditions of ultra-high or ultra-low temperatures, or when the ambient temperature is moderate but the temperature set by the user is greatly different from the ambient temperature (for example, within 5°C), it is difficult to reach the current temperature or the compressor frequency has reached the minimum during operation and the expected coil temperature cannot be reached.

[0031] In view of the above technical problems existing in the related art, the embodiment of the present application provides a PID control method based on variable shunt, which makes a variable shunt change to the PID algorithm under certain extreme working conditions and then controls the change mode more accurately through the variable shunt, making the algorithm more precise and the temperature control more accurate.

[0032] The PID control method based on variable split provided in the embodiment of the present application is described in detail below through specific embodiments and application scenarios in conjunction with the accompanying drawings.

[0033] like Figure 3 As shown, an embodiment of the present application provides a PID control method based on variable split, which may include the following steps 301 and 302: Step 301: During the operation of the air conditioner, determine whether the current ambient temperature meets the limit temperature condition.

[0034] Exemplarily, the above-mentioned extreme temperature condition may include any one of the following: when the air conditioner is in heating mode, the current ambient temperature is less than a first temperature threshold; when the air conditioner is in cooling mode, the current ambient temperature is greater than a second temperature threshold. The above-mentioned first temperature threshold is less than the second temperature threshold.

[0035] Specifically, the above step 301 may further include the following step 301a1 or step 301a2: Step 301a1, when the air conditioner is in heating mode, if the current ambient temperature is less than the first temperature threshold, it is determined that the limit temperature condition is met. Step 301a2: When the air conditioner is in cooling mode, if the current ambient temperature is greater than a second temperature threshold, it is determined that the limit temperature condition is met.

[0036] Exemplarily, when any of the above conditions is met, it can be determined whether the current ambient temperature meets the limit temperature condition.

[0037] Step 302: When the current ambient temperature meets the limit temperature condition, the target control strategy is executed cyclically until the current ambient temperature reaches the set temperature.

[0038] Among them, the target control strategy includes at least one of the following: a first control strategy, a second control strategy and a third control strategy; the first control strategy is: PID control of the compressor operating frequency and the valve opening of the throttle valve to adjust the coil temperature; the second control strategy is: changing the diversion mode of the diverter; the third control strategy is: PID control of the fan speed to adjust the ambient temperature.

[0039] For example, when the current ambient temperature satisfies the limit temperature condition, stable control of the ambient temperature can be achieved through one or more of the above target control strategies.

[0040] Specifically, the above step 302 may further include the following step 302a: Step 302a: when the current ambient temperature meets the limit temperature condition, determine whether the current coil temperature meets the standard; if not, execute the first control strategy in a loop until the coil temperature meets the standard.

[0041] For example, Figure 4As shown, when it is detected that the current ambient temperature meets the limit temperature condition, it is first determined whether the coil temperature meets the standard. If the coil temperature meets the standard, no operation is performed, otherwise, the first control strategy is executed cyclically until the coil temperature meets the standard.

[0042] It should be noted that, in a possible implementation, in the heating mode, the coil temperature is the coil temperature of the indoor unit, and the fan speed is the fan speed of the indoor unit; in the cooling mode, the coil temperature is the coil temperature of the outdoor unit, and the fan speed is the fan speed of the outdoor unit.

[0043] Specifically, after the above step 302a, the above step 302 may further include the following steps 302b1 and 302b2: Step 301b1: When the number of times the air conditioner executes the first control strategy reaches a first number threshold, if the coil temperature does not meet the standard, the second control strategy is executed.

[0044] Step 302b2: After executing the second control strategy for a first preset time period, if the coil temperature does not meet the standard, the first control strategy is executed repeatedly until the coil temperature meets the standard.

[0045] For example, Figure 4 As shown, after executing the above-mentioned first control strategy three times (i.e., the above-mentioned first numerical threshold), if the coil temperature still cannot meet the standard, it is necessary to execute the second control strategy, that is, to observe the system changes by changing the diversion method. If the coil temperature still cannot meet the standard after a period of time (i.e., after the above-mentioned first preset time length), the above-mentioned first control strategy is repeatedly executed until the coil temperature meets the standard.

[0046] Specifically, after the above step 302a, the above step 302 may further include the following steps 302c1 and 302c2: Step 302c1: when the number of times the air conditioner executes the first control strategy is less than or equal to the first number threshold, if the coil temperature reaches the standard, determine whether the current ambient temperature reaches the set temperature.

[0047] Step 302c2: If the current ambient temperature does not reach the set temperature, the third control strategy is executed in a loop until the current ambient temperature reaches the set temperature.

[0048] For example, Figure 4 As shown, if the coil temperature meets the standard during the execution of the first control strategy (or after the number of times reaches three times), the subsequent steps can be judged, that is, whether the current ambient temperature meets the standard (that is, the current ambient temperature reaches the set temperature).

[0049] Exemplarily, if the current ambient temperature meets the standard, no operation is performed, otherwise, the third control strategy is executed, that is, PID control is performed on the fan speed to adjust the ambient temperature until the ambient temperature meets the standard.

[0050] Specifically, after the above step 302c2, the above step 302 may further include the following steps 302d1 and 302d2: Step 302d1: When the number of times the air conditioner executes the third control strategy reaches a second number threshold, if the current ambient temperature does not reach the set temperature, execute the second control strategy.

[0051] Step 302d2: After executing the second control strategy for a second preset time period, if the current ambient temperature has not reached the set temperature, the third control strategy is executed in a loop until the current ambient temperature reaches the set temperature.

[0052] For example, Figure 4 As shown, after executing the third control strategy three times (i.e., the second numerical threshold mentioned above), if the current ambient temperature still cannot meet the standard, it is necessary to execute the second control strategy, that is, to observe the system changes by changing the diversion method. If the current ambient temperature still cannot meet the standard after a period of time (i.e., after the second preset time period mentioned above), the third control strategy is repeatedly executed until the current ambient temperature meets the standard.

[0053] Specifically, after the above step 302c2, the above step 302 may further include the following step 302e: Step 302e: when the number of times the air conditioner executes the third control strategy is less than or equal to the second number threshold, if the current ambient temperature reaches the set temperature, stop executing the third control strategy.

[0054] For example, Figure 4 As shown, if the current ambient temperature meets the standard during the execution of the third control strategy (or after the number of times reaches three times), it means that under the current working conditions, the current ambient temperature meets the user's needs and there is no need to execute any of the above target control strategies.

[0055] The PID control method based on variable shunt provided in the embodiment of the present application first determines whether the current ambient temperature meets the limit temperature condition during the operation of the air conditioner; then, when the current ambient temperature meets the limit temperature condition, the target control strategy is executed cyclically until the current ambient temperature reaches the set temperature; wherein, the target control strategy includes at least one of the following: a first control strategy, a second control strategy, and a third control strategy; the first control strategy is: PID control of the compressor operating frequency and the valve opening of the throttle valve to adjust the coil temperature; the second control strategy is: changing the shunt mode of the shunt; the third control strategy is: PID control of the fan speed to adjust the ambient temperature. In this way, by combining variable shunt with PID control, the air conditioner can maintain the indoor ambient temperature within the temperature range set by the user even under the harsh working conditions of ultra-high temperature and ultra-low temperature.

[0056] It should be noted that the PID control method based on variable shunt provided in the embodiment of the present application can be executed by a PID control device based on variable shunt, or a control module in the PID control device based on variable shunt for executing the PID control method based on variable shunt. In the embodiment of the present application, the PID control device based on variable shunt is taken as an example to illustrate the PID control method based on variable shunt provided in the embodiment of the present application.

[0057] It should be noted that, in the embodiments of the present application, the PID control methods based on variable shunt shown in the above-mentioned method drawings are all illustrated by taking one of the drawings in the embodiments of the present application as an example. In specific implementation, the PID control methods based on variable shunt shown in the above-mentioned method drawings can also be implemented in combination with any other drawings that can be combined as shown in the above-mentioned embodiments, which will not be repeated here.

[0058] The following is a description of the PID control device based on variable split provided in the present application. The PID control method based on variable split described below and described above can refer to each other.

[0059] Figure 5 A schematic diagram of the structure of a PID control device based on variable splitting provided in an embodiment of the present application is shown in FIG. Figure 5 As shown, specifically including: The judgment module 501 is used to judge whether the current ambient temperature meets the limit temperature condition during the operation of the air conditioner; the control module 502 is used to cyclically execute the target control strategy when the current ambient temperature meets the limit temperature condition until the current ambient temperature reaches the set temperature; wherein the target control strategy includes at least one of the following: a first control strategy, a second control strategy and a third control strategy; the first control strategy is: PID control of the compressor operating frequency and the valve opening of the throttle valve to adjust the coil temperature; the second control strategy is: changing the diversion mode of the diverter; the third control strategy is: PID control of the fan speed to adjust the ambient temperature.

[0060] Optionally, the judgment module 501 is specifically used to determine that the extreme temperature condition is met when the air conditioner is in heating mode and the current ambient temperature is less than a first temperature threshold; the judgment module 501 is also specifically used to determine that the extreme temperature condition is met when the air conditioner is in cooling mode and the current ambient temperature is greater than a second temperature threshold.

[0061] Optionally, the control module 502 is specifically configured to determine whether the current coil temperature meets the standard when the current ambient temperature meets the limit temperature condition; if not, cyclically execute the first control strategy until the coil temperature meets the standard.

[0062] Optionally, the control module 502 is specifically used to execute the second control strategy if the coil temperature does not meet the standard when the number of times the air conditioner executes the first control strategy reaches a first number threshold; the control module 502 is also specifically used to loop the execution of the first control strategy until the coil temperature meets the standard if the coil temperature does not meet the standard after executing the second control strategy for a first preset time period.

[0063] Optionally, the control module 502 is specifically used to determine whether the current ambient temperature reaches the set temperature if the coil temperature meets the standard when the number of times the air conditioner executes the first control strategy is less than or equal to the first number threshold; the control module 502 is also specifically used to loop the execution of the third control strategy until the current ambient temperature reaches the set temperature if the current ambient temperature does not reach the set temperature.

[0064] Optionally, the control module 502 is specifically used to execute the second control strategy if the current ambient temperature has not reached the set temperature when the air conditioner executes the third control strategy for a second number of times reaching a second number threshold; the control module 502 is also specifically used to execute the third control strategy in a loop if the current ambient temperature has not reached the set temperature after executing the second control strategy for a second preset time period until the current ambient temperature reaches the set temperature.

[0065] Optionally, the control module 502 is specifically configured to stop executing the third control strategy if the current ambient temperature reaches a set temperature when the number of times the air conditioner executes the third control strategy is less than or equal to the second number threshold.

[0066] The PID control device based on variable shunt provided in the present application first determines whether the current ambient temperature meets the limit temperature condition during the operation of the air conditioner; then, when the current ambient temperature meets the limit temperature condition, the target control strategy is cyclically executed until the current ambient temperature reaches the set temperature; wherein the target control strategy includes at least one of the following: a first control strategy, a second control strategy, and a third control strategy; the first control strategy is: PID control of the compressor operating frequency and the valve opening of the throttle valve to adjust the coil temperature; the second control strategy is: changing the shunt mode of the shunt; the third control strategy is: PID control of the fan speed to adjust the ambient temperature. In this way, by combining variable shunt with PID control, the air conditioner can maintain the indoor ambient temperature within the temperature range set by the user even under the harsh working conditions of ultra-high temperature and ultra-low temperature.

[0067] Figure 4 The physical structure diagram of an electronic device is shown as an example. The electronic device may be the above-mentioned air conditioner. Figure 4As shown, the electronic device may include: a processor 410, a communication interface 420, a memory 430 and a communication bus 440, wherein the processor 410, the communication interface 420 and the memory 430 communicate with each other through the communication bus 440. The processor 410 may call the logic instructions in the memory 430 to execute a PID control method based on variable splitting, the method comprising: first, during the operation of the air conditioner, determining whether the current ambient temperature meets the limit temperature condition; then, when the current ambient temperature meets the limit temperature condition, cyclically executing the target control strategy until the current ambient temperature reaches the set temperature; wherein the target control strategy includes at least one of the following: a first control strategy, a second control strategy and a third control strategy; the first control strategy is: PID control of the compressor operating frequency and the valve opening of the throttle valve to adjust the coil temperature; the second control strategy is: changing the splitting mode of the splitter; the third control strategy is: PID control of the fan speed to adjust the ambient temperature. In this way, by combining variable diversion with PID control, the air conditioner can maintain the indoor ambient temperature within the temperature range set by the user even under harsh working conditions of ultra-high temperature and ultra-low temperature.

[0068] In addition, the logic instructions in the above-mentioned memory 430 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0069] On the other hand, the present application also provides a computer program product, the computer program product includes a computer program stored on a computer-readable storage medium, the computer program includes program instructions, when the program instructions are executed by the computer, the computer can execute the PID control method based on variable shunt provided by the above methods, the method comprising: first, during the operation of the air conditioner, judging whether the current ambient temperature meets the limit temperature condition; then, when the current ambient temperature meets the limit temperature condition, cyclically executing the target control strategy until the current ambient temperature reaches the set temperature; wherein the target control strategy includes at least one of the following: a first control strategy, a second control strategy and a third control strategy; the first control strategy is: PID control of the compressor operating frequency and the valve opening of the throttle valve to adjust the coil temperature; the second control strategy is: changing the shunt mode of the shunt; the third control strategy is: PID control of the fan speed to adjust the ambient temperature. In this way, by combining variable shunt with PID control, the air conditioner can maintain the indoor ambient temperature within the temperature range set by the user under the harsh working conditions of ultra-high temperature and ultra-low temperature.

[0070] On the other hand, the present application also provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, it is implemented to execute the above-mentioned PID control method based on variable shunt, the method comprising: first, during the operation of the air conditioner, judging whether the current ambient temperature meets the limit temperature condition; then, when the current ambient temperature meets the limit temperature condition, cyclically executing the target control strategy until the current ambient temperature reaches the set temperature; wherein the target control strategy includes at least one of the following: a first control strategy, a second control strategy and a third control strategy; the first control strategy is: PID control of the compressor operating frequency and the valve opening of the throttle valve to adjust the coil temperature; the second control strategy is: changing the shunt mode of the shunt; the third control strategy is: PID control of the fan speed to adjust the ambient temperature. In this way, by combining variable shunt with PID control, the air conditioner can maintain the indoor ambient temperature within the temperature range set by the user even under the harsh working conditions of ultra-high temperature and ultra-low temperature.

[0071] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0072] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A PID control method based on variable split flow, characterized in that: Applied to an air conditioner, the flow splitting mode of the flow splitter of the air conditioner includes single-way flow splitting and double-way flow splitting, and the method includes: During the operation of the air conditioner, it is determined whether the current ambient temperature meets the limit temperature condition; When the current ambient temperature meets the limit temperature condition, the target control strategy is executed cyclically until the current ambient temperature reaches the set temperature; Among them, the target control strategy includes at least one of the following: a first control strategy, a second control strategy and a third control strategy; the first control strategy is: PID control of the compressor operating frequency and the valve opening of the throttle valve to adjust the coil temperature; the second control strategy is: changing the diversion mode of the diverter; the third control strategy is: PID control of the fan speed to adjust the ambient temperature.

2. The method according to claim 1, characterized in that During the operation of the air conditioner, the step of determining whether the current ambient temperature meets the limit temperature condition includes: When the air conditioner is in the heating mode, if the current ambient temperature is less than the first temperature threshold, it is determined that the limit temperature condition is met; or, When the air conditioner is operating in the cooling mode, if the current ambient temperature is greater than the second temperature threshold, it is determined that the limit temperature condition is met.

3. The method according to claim 1 or 2, characterized in that: When the current ambient temperature meets the limit temperature condition, the target control strategy is cyclically executed until the current ambient temperature reaches the set temperature, including: When the current ambient temperature meets the limit temperature condition, it is determined whether the current coil temperature meets the standard. If not, the first control strategy is executed cyclically until the coil temperature meets the standard.

4. The method according to claim 3, characterized in that When the current ambient temperature meets the limit temperature condition, the target control strategy is cyclically executed until the current ambient temperature reaches the set temperature, including: When the number of times the air conditioner executes the first control strategy reaches a first number threshold, if the coil temperature does not meet the standard, then the second control strategy is executed; After executing the second control strategy for a first preset time period, if the coil temperature does not meet the standard, the first control strategy is executed in a loop until the coil temperature meets the standard.

5. The method according to claim 4, characterized in that When the current ambient temperature meets the limit temperature condition, the target control strategy is cyclically executed until the current ambient temperature reaches the set temperature, including: When the number of times the air conditioner executes the first control strategy is less than or equal to the first number threshold, if the coil temperature reaches the standard, determining whether the current ambient temperature reaches the set temperature; If the current ambient temperature does not reach the set temperature, the third control strategy is executed cyclically until the current ambient temperature reaches the set temperature.

6. The method according to claim 5, characterized in that When the current ambient temperature meets the limit temperature condition, the target control strategy is cyclically executed until the current ambient temperature reaches the set temperature, including: When the number of times the air conditioner executes the third control strategy reaches the second number threshold, if the current ambient temperature does not reach the set temperature, the second control strategy is executed; After executing the second control strategy for a second preset time period, if the current ambient temperature has not reached the set temperature, the third control strategy is executed in a loop until the current ambient temperature reaches the set temperature.

7. The method according to claim 6, characterized in that When the current ambient temperature meets the limit temperature condition, the target control strategy is cyclically executed until the current ambient temperature reaches the set temperature, including: When the number of times the air conditioner executes the third control strategy is less than or equal to the second number threshold, if the current ambient temperature reaches the set temperature, the third control strategy is stopped.

8. A PID control device based on variable split flow, characterized in that: The device comprises: A judgment module, used to judge whether the current ambient temperature meets the limit temperature condition during the operation of the air conditioner; A control module, configured to cyclically execute the target control strategy when the current ambient temperature meets the limit temperature condition until the current ambient temperature reaches the set temperature; Among them, the target control strategy includes at least one of the following: a first control strategy, a second control strategy and a third control strategy; the first control strategy is: PID control of the compressor operating frequency and the valve opening of the throttle valve to adjust the coil temperature; the second control strategy is: changing the diversion mode of the diverter; the third control strategy is: PID control of the fan speed to adjust the ambient temperature.

9. An air conditioner, characterized in that: The invention comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the PID control method based on variable split according to any one of claims 1 to 7 when executing the program.

10. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed by a processor, the steps of the PID control method based on variable split according to any one of claims 1 to 7 are implemented.

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