Compressor capacity control method and control device, storage medium, air conditioner

Abstract

The application discloses a kind of compressor capacity control method and control device, storage medium, air conditioner, the method includes: obtaining current indoor temperature and set temperature;When the first temperature difference between current indoor temperature and set temperature exceeds preset temperature range, obtain current compressor speed, the temperature of current indoor heat exchanger, the target temperature of indoor heat exchanger, current pressure ratio and target pressure ratio;According to the first temperature difference, obtain the first correction value, and according to the difference between the temperature of current indoor heat exchanger and the target temperature of indoor heat exchanger, obtain the second correction value, and according to the difference between current pressure ratio and target pressure ratio, obtain the third correction value;According to current compressor speed, the first correction value, the second correction value and the third correction value determine the compressor speed at next time.The control method of the application, by adjusting the speed of compressor, realizes the efficient operation of compressor, energy saving.

Description

Technical Field

[0001] This invention relates to the field of household appliance technology, and in particular to a compressor capacity control method, a computer-readable storage medium, an air conditioner, and a compressor capacity control device. Background Technology

[0002] As people's living standards improve, air conditioners, as a device for regulating indoor temperature, have become widely used. By controlling the operating frequency of the compressor, the indoor temperature can be set to meet people's needs.

[0003] Current compressor control methods utilize the PMV (Predicted Mean Vote) comfort index to control compressor speed based on factors such as temperature, humidity, radiation, airflow, activity level, and clothing load. This means the compressor is controlled based on temperature and humidity. Other methods determine compressor speed based on factors like the air deflector angle, indoor fan volume, outdoor temperature, humidity, indoor heat exchanger temperature, and indoor temperature. However, both of these methods only consider whether the indoor temperature reaches the set temperature and do not account for energy-efficient compressor operation. Summary of the Invention

[0004] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, the first objective of this invention is to propose a compressor capacity control method that adjusts the compressor speed at the next moment based on correction values ​​between the current indoor temperature and the set temperature, correction values ​​between the current indoor heat exchanger temperature and the target indoor heat exchanger temperature, correction values ​​between the current pressure ratio and the target pressure ratio, and the current compressor speed, thereby achieving efficient and energy-saving operation of the compressor.

[0005] A second objective of this invention is to provide a computer-readable storage medium.

[0006] The third objective of this invention is to provide an air conditioner.

[0007] The fourth objective of this invention is to provide a compressor capacity control device.

[0008] To achieve the above objectives, a first aspect of the present invention provides a compressor capacity control method, comprising: acquiring a current indoor temperature and a set temperature; when a first temperature difference between the current indoor temperature and the set temperature exceeds a preset temperature range, acquiring a current compressor speed, a current indoor heat exchanger temperature, a target indoor heat exchanger temperature, a current pressure ratio, and a target pressure ratio; acquiring a first correction value based on the first temperature difference, acquiring a second correction value based on the difference between the current indoor heat exchanger temperature and the target indoor heat exchanger temperature, and acquiring a third correction value based on the difference between the current pressure ratio and the target pressure ratio; and determining the compressor speed at the next moment based on the current compressor speed, the first correction value, the second correction value, and the third correction value.

[0009] According to the compressor capacity control method of the present invention, the current indoor temperature and the set temperature are first obtained. Then, when the first temperature difference between the current indoor temperature and the set temperature exceeds a preset temperature range, the current compressor speed, the current temperature of the indoor heat exchanger, the target temperature of the indoor heat exchanger, the current pressure ratio, and the target pressure ratio are obtained. Next, a first correction value is obtained based on the first temperature difference, a second correction value is obtained based on the difference between the current temperature of the indoor heat exchanger and the target temperature of the indoor heat exchanger, and a third correction value is obtained based on the difference between the current pressure ratio and the target pressure ratio. Finally, the compressor speed at the next moment is determined based on the current compressor speed, the first correction value, the second correction value, and the third correction value. Thus, this method adjusts the compressor speed at the next moment based on the correction values ​​between the current indoor temperature and the set temperature, the correction values ​​between the current temperature of the indoor heat exchanger and the target temperature of the indoor heat exchanger, the correction values ​​between the current pressure ratio and the target pressure ratio, and the current compressor speed, thereby achieving efficient and energy-saving operation of the compressor.

[0010] In addition, the compressor capacity control method according to the above embodiments of the present invention may also have the following additional technical features: According to one embodiment of the present invention, determining the compressor speed at the next moment based on the current compressor speed, a first correction value, a second correction value, and a third correction value includes: obtaining the current operating condition of the compressor; determining correction coefficients for the first correction value, the second correction value, and the third correction value based on the current operating condition; determining a compressor speed correction value based on the first correction value and its corresponding correction coefficient, the second correction value and its corresponding correction coefficient, and the third correction value and its corresponding correction coefficient; and determining the compressor speed at the next moment based on the current compressor speed and the compressor speed correction value.

[0011] According to one embodiment of the present invention, the compressor speed at the next moment is determined by the following formula:

[0012] in, This indicates the compressor speed at the next moment. Indicates the current compressor speed. This indicates the compressor speed correction value. This indicates the second correction value. This represents the first correction value. This indicates the third correction value. , and These represent the corresponding correction coefficients.

[0013] According to an embodiment of the present invention, the first correction value is obtained by the following formula:

[0014] in, This represents the first correction value. This represents the difference between the current indoor temperature and the set temperature. This represents the difference between the indoor temperature and the set temperature at the previous moment. This represents the difference between the indoor temperature at the previous moment and the set temperature. , and These represent the proportional coefficient, integral coefficient, and differential coefficient, respectively.

[0015] According to an embodiment of the present invention, the second correction value is obtained by the following formula:

[0016] in, This indicates the second correction value. This represents the difference between the current temperature of the indoor heat exchanger and the target temperature of the indoor heat exchanger. This represents the difference between the temperature of the indoor heat exchanger at the previous moment and the target temperature of the indoor heat exchanger. This represents the difference between the temperature of the indoor heat exchanger at the previous moment and the target temperature of the indoor heat exchanger. , and These represent the proportional coefficient, integral coefficient, and differential coefficient, respectively.

[0017] According to one embodiment of the present invention, a scaling factor is determined based on the difference between the current temperature of the indoor heat exchanger and the target temperature of the indoor heat exchanger. Integral coefficient and differential coefficients .

[0018] According to an embodiment of the present invention, the third correction value is obtained by the following formula:

[0019] in, This indicates the third correction value. This represents the difference between the current pressure ratio and the target pressure ratio. This represents the difference between the pressure ratio at the previous moment and the target pressure ratio. This represents the difference between the pressure ratio at the previous moment and the target pressure ratio. , and These represent the proportional coefficient, integral coefficient, and differential coefficient, respectively.

[0020] According to one embodiment of the present invention, obtaining the target pressure ratio includes: obtaining the current outdoor ambient temperature and the current air volume of the indoor fan; and determining the target pressure ratio based on the current compressor speed, the set temperature, the current outdoor ambient temperature, and the current air volume of the indoor fan.

[0021] According to an embodiment of the present invention, the above-described compressor capacity control method further includes: when the first temperature difference does not exceed a preset temperature range, determining the compressor speed at the next moment based on the current compressor speed and a first correction value.

[0022] According to one embodiment of the present invention, before obtaining the compressor speed at the next moment, the method further includes: reducing the current compressor speed when the compressor outlet pressure exceeds the high pressure protection threshold; and increasing the current compressor speed when the compressor inlet pressure is lower than the low pressure protection threshold.

[0023] To achieve the above objectives, a second aspect of the present invention provides a computer-readable storage medium storing a compressor capacity control program thereon, which, when executed by a processor, implements the compressor capacity control method described above.

[0024] The computer-readable storage medium of this invention, by executing the above-described compressor capacity control method, can adjust the compressor speed to achieve efficient and energy-saving operation of the compressor.

[0025] To achieve the above objectives, a third aspect of the present invention provides an air conditioner including a memory, a processor, and a compressor capacity control program stored in the memory and executable on the processor. When the processor executes the compressor capacity control program, it implements the above-described compressor capacity control method.

[0026] The air conditioner of this invention, by executing the above-described compressor capacity control method, can adjust the compressor speed to achieve efficient and energy-saving operation of the compressor.

[0027] To achieve the above objectives, a fourth aspect of the present invention provides a compressor capacity control device, comprising: a first acquisition module for acquiring a current indoor temperature and a set temperature; a second acquisition module for acquiring a current compressor speed, a current indoor heat exchanger temperature, a target indoor heat exchanger temperature, a current pressure ratio, and a target pressure ratio when a first temperature difference between the current indoor temperature and the set temperature exceeds a preset temperature range; a third acquisition module for acquiring a first correction value based on the first temperature difference, a second correction value based on the difference between the current indoor heat exchanger temperature and the target indoor heat exchanger temperature, and a third correction value based on the difference between the current pressure ratio and the target pressure ratio; and a determination module for determining the compressor speed at the next moment based on the current compressor speed, the first correction value, the second correction value, and the third correction value.

[0028] According to an embodiment of the compressor capacity control device of the present invention, a first acquisition module acquires the current indoor temperature and a set temperature. A second acquisition module, when the first temperature difference between the current indoor temperature and the set temperature exceeds a preset temperature range, acquires the current compressor speed, the current temperature of the indoor heat exchanger, the target temperature of the indoor heat exchanger, the current pressure ratio, and the target pressure ratio. A third acquisition module acquires a first correction value based on the first temperature difference, a second correction value based on the difference between the current temperature of the indoor heat exchanger and the target temperature of the indoor heat exchanger, and a third correction value based on the difference between the current pressure ratio and the target pressure ratio. A determining module determines the compressor speed at the next moment based on the current compressor speed, the first correction value, the second correction value, and the third correction value. Therefore, the device adjusts the compressor speed at the next moment based on the correction values ​​between the current indoor temperature and the set temperature, the correction values ​​between the current temperature of the indoor heat exchanger and the target temperature of the indoor heat exchanger, the correction values ​​between the current pressure ratio and the target pressure ratio, and the current compressor speed, thereby achieving efficient and energy-saving operation of the compressor.

[0029] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0030] Figure 1 A flowchart of a compressor capacity control method according to an embodiment of the present invention; Figure 2 This is a schematic diagram of an air conditioning system according to an embodiment of the present invention; Figure 3 This is a schematic diagram of a plate-fin stacked heat exchanger according to an embodiment of the present invention; Figure 4 This is a schematic diagram illustrating the relationship between compressor efficiency, pressure ratio, and speed according to an embodiment of the present invention. Figure 5 This is a schematic diagram of the compressor target pressure ratio and compressor speed according to an embodiment of the present invention; Figure 6 This is a schematic diagram illustrating the relationship between the compressor target pressure ratio and indoor air volume according to an embodiment of the present invention; Figure 7 This is a schematic diagram illustrating the relationship between compressor efficiency, compressor speed, and pressure ratio according to an embodiment of the present invention. Figure 8 This is a schematic diagram illustrating the pressure ratio change between a compressor capacity control method according to an embodiment of the present invention and an existing control method. Figure 9 This is a comparison diagram between a compressor capacity control method according to an embodiment of the present invention and an existing control method; Figure 10 A flowchart illustrating a compressor capacity control method according to a specific example of the present invention; Figure 11 This is a block diagram of an air conditioner according to an embodiment of the present invention; Figure 12 This is a block diagram of a compressor capacity control device according to an embodiment of the present invention. Detailed Implementation

[0031] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0032] The following description, with reference to the accompanying drawings, outlines an embodiment of the compressor capacity control method, a computer-readable storage medium, an air conditioner, and a compressor capacity control device.

[0033] In one embodiment of the present invention, such as Figure 2 As shown, the air conditioner may include an outdoor unit 100 and an indoor unit 101. The outdoor unit 100 includes a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, an expansion valve 4, an outdoor liquid preventive valve 5, an outdoor gas preventive valve 11, a liquid receiver 12, and an outdoor fan 13. The indoor unit 101 includes an indoor liquid connection port 7, an indoor heat exchanger 8, an indoor gas connection port 9, and an indoor fan 14. The outdoor unit 100 and the indoor unit 101 are connected via a liquid piping 6 and a gas piping 10. Additionally, the air conditioner includes a temperature sensor 15 mounted on the outdoor heat exchanger, a temperature sensor 16 mounted on the indoor heat exchanger, and an indoor temperature sensor 17.

[0034] When the air conditioner is in cooling mode, the high-temperature, high-pressure gaseous refrigerant compressed in compressor 1 passes through four-way valve 2 and condenses into liquid refrigerant after exchanging heat with the surrounding air in outdoor heat exchanger 3 via outdoor fan 13. The liquid refrigerant is then depressurized in expansion valve 4 into a two-phase state (gas-liquid mixture). After passing through outdoor liquid prevention valve 5, liquid piping 6, and indoor liquid connection port 7, it evaporates into gaseous refrigerant in indoor heat exchanger 8 after exchanging heat with the surrounding air via indoor fan 14. Through the vaporization of the liquid refrigerant, heat is carried away from the indoor air, lowering the indoor temperature and achieving cooling. The gaseous refrigerant then returns to compressor 1 after passing through four-way valve 2 and liquid receiver 12 to continue circulating, ensuring continuous cooling.

[0035] When the air conditioner is in heating mode, the high-temperature, high-pressure gaseous refrigerant compressed by the compressor 1 passes through the four-way valve 2, then through the outdoor anti-refrigerant valve 11, gas piping 10, and indoor gas connection port 9. In the indoor heat exchanger 8, it exchanges heat with the surrounding air through the indoor fan 14 and then condenses into liquid refrigerant. The heat released during condensation increases the temperature of the surrounding air, thus raising the indoor temperature and providing heating. The liquid refrigerant passes through the indoor liquid connection port 7, liquid piping 6, and outdoor liquid anti-refrigerant valve 5. At the expansion valve 4, it is depressurized, becoming a two-phase state. In the outdoor heat exchanger 3, it exchanges heat with the surrounding air through the outdoor fan 13 and then evaporates into gaseous refrigerant. The gaseous refrigerant then returns to the compressor 1 after passing through the four-way valve 2 and the liquid receiver 12 to continue circulating, thus achieving continuous heating for the air conditioner.

[0036] When the air conditioner is in cooling or heating mode, the compressor speed is controlled by the relationship between the indoor temperature detected by the indoor temperature sensor 17 and the set temperature, so that the indoor temperature reaches the set temperature.

[0037] Most current air conditioners use plate-fin heat exchangers, such as Figure 3 As shown, a plate-fin heat exchanger is a structure that combines two aluminum sheets. By channeling refrigerant into tiny flow paths A to A', approximately several thousand to several hundred micrometers in diameter, it achieves high heat transfer performance and significantly reduces the amount of refrigerant required. Traditional finned tube heat exchangers have tube inner diameters of approximately 4 to 10 millimeters. Compared to traditional finned tube heat exchangers, plate-fin heat exchangers have even smaller internal volumes and cannot absorb changes in refrigerant volume. They are particularly prone to high-pressure increases under overload conditions, especially when outdoor air temperatures are high. Due to this characteristic, as the compressor speed increases, the pressure also increases, which in turn causes the compressor speed to decrease, thus failing to achieve energy savings.

[0038] Therefore, in order to solve the above problems, the present invention corrects the compressor speed based on the current indoor temperature, set temperature, indoor heat exchanger temperature, target temperature, pressure ratio and current compressor speed, and then obtains the compressor speed at the next moment, which can avoid the inefficiency caused by excessive pressure rise.

[0039] Figure 1 This is a flowchart of a compressor capacity control method according to an embodiment of the present invention.

[0040] like Figure 1 As shown, the compressor capacity control method of this embodiment may include the following steps: S1, acquire the current indoor temperature and the set temperature. The indoor temperature can be obtained through an indoor temperature sensor, and the set temperature can be preset via a remote control or smart terminal.

[0041] S2, when the first temperature difference between the current indoor temperature and the set temperature exceeds the preset temperature range, acquires the current compressor speed, the current temperature of the indoor heat exchanger, the target temperature of the indoor heat exchanger, the current pressure ratio, and the target pressure ratio. The preset temperature range can be determined according to actual conditions; for example, the preset temperature range is -1℃ to 1℃.

[0042] S3, obtain a first correction value based on the first temperature difference, obtain a second correction value based on the difference between the current temperature of the indoor heat exchanger and the target temperature of the indoor heat exchanger, and obtain a third correction value based on the difference between the current pressure ratio and the target pressure ratio.

[0043] S4, determine the compressor speed at the next moment based on the current compressor speed, the first correction value, the second correction value, and the third correction value.

[0044] Specifically, taking cooling mode as an example, when there is a significant difference between the current indoor temperature and the set temperature, the compressor's operating frequency needs to be adjusted to bring the current indoor temperature to the set temperature. For instance, if the current indoor temperature is higher than the set temperature, the compressor's operating frequency needs to be increased to lower the current indoor temperature; conversely, if the current indoor temperature is lower than the set temperature, the compressor's operating frequency needs to be decreased to raise the current indoor temperature. In controlling the compressor, it's not only necessary to consider whether the indoor temperature has reached the set temperature, but also how to control the compressor to ensure the air conditioner's optimal energy efficiency.

[0045] By performing differential approximation calculations on the temperature difference between the current indoor temperature and the set temperature (e.g., using PID closed-loop control), a first correction value is obtained. Then, a second correction value is obtained by performing differential approximation calculations on the temperature difference between the current indoor heat exchanger temperature and the target indoor heat exchanger temperature. Finally, a third correction value is obtained by performing differential approximation calculations on the difference between the current pressure ratio and the target pressure ratio. The compressor speed for the next moment is then calculated based on the compressor speed, the sum of the first, second, and third correction values, and the compressor is controlled accordingly. Furthermore, depending on the air conditioner's operating conditions, the first, second, and third correction values ​​can be multiplied by corresponding coefficients to obtain the compressor speed for the next moment under different operating conditions.

[0046] The following describes in detail how to obtain the first correction value, the second correction value, the third correction value, and the compressor speed at the next moment.

[0047] According to an embodiment of the present invention, the first correction value can be obtained by the following formula: (1) in, This represents the first correction value. This represents the difference between the current indoor temperature and the set temperature. This represents the difference between the indoor temperature and the set temperature at the previous moment. This represents the difference between the indoor temperature at the previous moment and the set temperature. , and These represent the proportional coefficient, integral coefficient, and differential coefficient, respectively.

[0048] According to one embodiment of the present invention, the second correction value is obtained by the following formula: (2) in, This indicates the second correction value. This represents the difference between the current temperature of the indoor heat exchanger and the target temperature of the indoor heat exchanger. This represents the difference between the temperature of the indoor heat exchanger at the previous moment and the target temperature of the indoor heat exchanger. This represents the difference between the temperature of the indoor heat exchanger at the previous moment and the target temperature of the indoor heat exchanger. , and These represent the proportional coefficient, integral coefficient, and differential coefficient, respectively.

[0049] According to an embodiment of the present invention, the third correction value is obtained by the following formula: (3) in, This indicates the third correction value. This represents the difference between the current pressure ratio and the target pressure ratio. This represents the difference between the pressure ratio at the previous moment and the target pressure ratio. This represents the difference between the pressure ratio at the previous moment and the target pressure ratio. , and These represent the proportional coefficient, integral coefficient, and differential coefficient, respectively.

[0050] Specifically, when controlling the compressor speed, the interval between the increase and decrease of the compressor speed is usually set to tens of seconds to several minutes (one control cycle), and the interval time can be recorded by a timer. The compressor speed is controlled in each control cycle, and the timer is reset to zero after the compressor speed control is completed. When the temperature difference between the current indoor temperature and the set temperature exceeds the preset temperature range, in order to make the indoor temperature closer to the set temperature, PID control (Proportional-Integral-Differential Controller) can be used to adjust the difference between the indoor temperature and the set temperature, the difference between the indoor heat exchanger temperature and the target temperature of the indoor heat exchanger, and the difference between the current pressure ratio and the target pressure ratio, so that the differences of each item are close to 0, and convergent control is achieved. For example, the first correction value can be obtained by formula (1), the second correction value can be obtained by formula (2), and the third correction value can be obtained by formula (3).

[0051] According to one embodiment of the present invention, a proportionality coefficient is determined based on the difference between the current temperature of the indoor heat exchanger and the target temperature of the indoor heat exchanger. Integral coefficient and differential coefficients .

[0052] Specifically, regardless of whether the air conditioner is operating in cooling mode or heating mode, the proportionality coefficient is determined based on the difference between the indoor heat exchanger temperature and the target indoor heat exchanger temperature. Integral coefficient and differential coefficients As shown in Table 1, it can be understood that when the air conditioner is running in heating mode, the temperature of the indoor heat exchanger refers to the condensing temperature, and when the air conditioner is running in cooling mode, the temperature of the indoor heat exchanger refers to the evaporating temperature.

[0053] Table 1

[0054] As shown in Table 1, the current temperature of the indoor heat exchanger is T. i The target temperature of the indoor heat exchanger is T. i The difference between the two is different, and the corresponding proportionality coefficients are different. Integral coefficient and differential coefficients Different. For example, when T i >T i When '+2, the corresponding proportionality coefficient Integral coefficient and differential coefficients The values ​​are 20, 15, and 10 respectively. When T... i -2≤T i ≤T i When '-2, the corresponding proportionality coefficient Integral coefficient and differential coefficients The values ​​are 10, 5, and 3 respectively. When T... i <T i When '-2, the corresponding proportionality coefficient Integral coefficient and differential coefficients They are 20, 15, and 10 respectively.

[0055] It should be noted that the proportionality coefficient is determined based on the difference between the current temperature of the indoor heat exchanger and the target temperature of the indoor heat exchanger. Integral coefficient and differential coefficients The coefficients can also be used as proportional coefficients, integral coefficients, and differential coefficients when obtaining the first correction value and the third correction value.

[0056] According to one embodiment of the present invention, determining the compressor speed at the next moment based on the current compressor speed, a first correction value, a second correction value, and a third correction value includes: obtaining the current operating condition of the compressor; determining correction coefficients for the first correction value, the second correction value, and the third correction value based on the current operating condition; determining a compressor speed correction value based on the first correction value and its corresponding correction coefficient, the second correction value and its corresponding correction coefficient, and the third correction value and its corresponding correction coefficient; and determining the compressor speed at the next moment based on the current compressor speed and the compressor speed correction value.

[0057] According to one embodiment of the present invention, the compressor speed at the next moment is determined by the following formula: (4) in, This indicates the compressor speed at the next moment. Indicates the current compressor speed. This indicates the compressor speed correction value. This indicates the second correction value. This represents the first correction value. This indicates the third correction value. , and These represent the corresponding correction coefficients.

[0058] Specifically, before determining the compressor speed at the next moment, the current operating condition of the compressor is first obtained. The correction coefficients A for the first correction value, B for the second correction value, and C for the third correction value are different for different operating conditions, as shown in Table 2.

[0059] Table 2

[0060] As shown in Table 2, when the compressor is currently operating under standard conditions, the correction coefficients for the first, second, and third correction values ​​are all 1. When the compressor is currently operating under priority efficiency conditions, the correction coefficients for the first, second, and third correction values ​​are all 1, 1, and 3, respectively. When the compressor is currently operating under priority capacity conditions, the correction coefficients for the first, second, and third correction values ​​are all 1, 1, 3, and 1, respectively.

[0061] Once the correction coefficients for the first, second, and third correction values ​​are obtained, the compressor speed at the next moment can be obtained based on the first, second, and third correction values ​​and the current compressor speed. For example, the compressor speed at the next moment can be obtained through the above formula (4), and the compressor can be controlled to run at the calculated speed. Thus, efficient and energy-saving operation of the compressor can be achieved, and the indoor temperature can be made closer to the set temperature.

[0062] Considering the relationship between compressor speed and pressure ratio, such as Figure 4 As shown, compressor efficiency is typically highest at a reasonable compressor speed and pressure ratio. Once the pressure ratio and compressor speed deviate from the reasonable range, operating efficiency decreases. Therefore, operating the compressor at high efficiency is crucial for energy-saving operation. Furthermore, the upper and lower limits of the pressure ratio and compressor speed for continuous operation are preset within the compressor's operating range, necessitating compressor capacity control within these defined operating ranges.

[0063] According to one embodiment of the present invention, obtaining the target pressure ratio includes: obtaining the current outdoor ambient temperature and the current air volume of the indoor fan; and determining the target pressure ratio based on the current compressor speed, the set temperature, the current outdoor ambient temperature, and the current air volume of the indoor fan.

[0064] Specifically, the current pressure ratio can be obtained from the condensing pressure and evaporating pressure of the refrigerant. Taking R32 refrigerant as an example, the relationship between its condensing pressure and condensing temperature, as well as its evaporating pressure and evaporating temperature, is known. Therefore, the current pressure ratio can be calculated based on the ratio of the condensing pressure to the evaporating pressure.

[0065] With the compressor speed and set temperature fixed, the target pressure ratio can be determined based on the outdoor ambient temperature and the current airflow of the indoor unit. For example, the outdoor ambient temperature can be measured using a mercury thermometer, or obtained from a 24-hour weather forecast. The airflow of the indoor unit fan can be determined by the user's selection; generally, there are low, medium, and high airflow options. Figure 5 As shown, taking an outdoor ambient temperature of T4, an indoor unit fan volume of high, and a compressor speed of 1400 rpm as an example, the target pressure ratio can be obtained under these conditions. Figure 6 As shown, with the compressor speed, set temperature, and outside air temperature fixed, the higher the indoor air volume, the lower the target pressure ratio will be.

[0066] See Figure 7 As shown, under different operating conditions, the current pressure ratio is... Transform into a pre-mapped target pressure ratio (consisting of 5 and Figure 6 The calculated ideal pressure ratio can achieve higher efficiency. In actual processes, considering energy conservation, a slightly lower value can be set to achieve the target pressure ratio. When controlled, the pressure ratio is reduced by decreasing the compressor speed, achieving high compressor efficiency. The target pressure ratio is an ideal operating condition derived from outdoor air and indoor air volume, thus avoiding excessive high-pressure rises and ensuring high reliability. Furthermore, in addition to normal operation, the target pressure ratio can be set multiple times to achieve energy-saving and other high-efficiency pressure ratios, meeting diverse user needs.

[0067] To verify that the method used in this invention to obtain the target pressure ratio is superior to the traditional method of setting the target pressure ratio, an example is provided, such as... Figure 8 As shown, the control logic in related technologies is as follows: A rise in high pressure causes a rise in condensing temperature. When this temperature exceeds a certain critical value, the compressor speed is forcibly reduced. However, due to control follow-up issues, this may result in the critical value being exceeded too much, leading to overshoot. The control logic of this application, on the other hand, is that the pressure ratio is much easier to detect than the condensing pressure. Therefore, the compressor speed is reduced before reaching the control critical value for condensing pressure, effectively avoiding excessive increases in both high and condensing pressure.

[0068] like Figure 9 As shown, in related technologies, control only begins when the pressure ratio exceeds a critical value requiring protection. While this protective control can safeguard the pressure ratio range, it deviates significantly from the ideal pressure ratio, which is disadvantageous from an efficiency perspective. The control strategy of this application detects the deviation between the current pressure ratio and the target pressure ratio in real time for control, thus avoiding large deviations and enabling high-efficiency operation. Therefore, obtaining the target pressure ratio through the above method can effectively avoid excessive increases in high-pressure and condensing pressure, allowing the air conditioner to operate energy-efficiently.

[0069] In addition, according to an embodiment of the present invention, the above-mentioned compressor capacity control method further includes: when the first temperature difference does not exceed the preset temperature range, determining the compressor speed at the next moment based on the current compressor speed and the first correction value.

[0070] In other words, when the temperature difference between the current indoor temperature and the set temperature does not exceed the preset temperature range—for example, when the absolute value of the temperature difference between the current indoor temperature and the set temperature is less than 1—the compressor speed for the next moment only needs to be determined based on the current compressor speed and the first correction value. Therefore, by controlling the compressor speed, the current indoor temperature is made as close as possible to the set temperature. This indicates the compressor speed at the next moment. This represents the correction value, and A' is the correction coefficient. It is also obtained using PID control.

[0071] According to one embodiment of the present invention, before obtaining the compressor speed at the next moment, the method further includes: reducing the current compressor speed when the compressor outlet pressure exceeds a high-pressure protection threshold; and increasing the current compressor speed when the compressor inlet pressure is lower than a low-pressure protection threshold. The high-pressure protection threshold and the low-pressure protection threshold are determined based on the compressor speed.

[0072] Specifically, before obtaining the compressor speed at the next moment, it is first determined whether the current compressor outlet pressure and inlet pressure exceed the set critical values. If the current compressor speed is too high and the compressor outlet pressure is too high, exceeding the maximum value of the set critical value (high-pressure protection threshold), the compressor speed needs to be reduced. If the current compressor speed is too slow and the compressor inlet pressure is too low, not reaching the minimum value of the set critical value (low-pressure protection threshold), the compressor speed needs to be increased. Additionally, upper and lower speed limits for the compressor can be set. When increasing or decreasing the compressor speed, or when determining the next calculated compressor speed, it is checked whether the adjusted speed is between the upper and lower speed limits to ensure the compressor speed remains in a reasonable and stable state.

[0073] The following is combined Figure 10 The control method of the present invention will be described below.

[0074] As a specific example, the compressor capacity control method of the present invention may include the following steps: S100, the compressor is running.

[0075] S101, determine whether the compressor outlet pressure exceeds the protection control threshold. If yes, proceed to step S103; if no, proceed to step S102.

[0076] S102, Determine whether the compressor inlet pressure is lower than the protection control threshold. If yes, proceed to step S104; if no, proceed to step S105.

[0077] S103, reduce the current compressor speed.

[0078] S104, Increase the current compressor speed.

[0079] S105, determine whether the compressor has operated for a certain period ΔT. If yes, proceed to step S106; if no, proceed to step S110.

[0080] S106, Determine whether |Set Temperature - Indoor Temperature| < 1℃ is true. If yes, proceed to step S108; if no, proceed to step S107.

[0081] S107, determine the compressor speed at the next moment based on the current compressor speed, the first correction value, the second correction value, and the third correction value.

[0082] S108, determine the compressor speed at the next moment based on the current compressor speed and the first correction value.

[0083] S109, timer reset.

[0084] S110, confirm that the compressor speed is between the upper and lower limits.

[0085] In summary, the compressor capacity control method according to embodiments of the present invention first acquires the current indoor temperature and the set temperature. Then, when the first temperature difference between the current indoor temperature and the set temperature exceeds a preset temperature range, it acquires the current compressor speed, the current temperature of the indoor heat exchanger, the target temperature of the indoor heat exchanger, the current pressure ratio, and the target pressure ratio. Next, it acquires a first correction value based on the first temperature difference, a second correction value based on the difference between the current temperature of the indoor heat exchanger and the target temperature of the indoor heat exchanger, and a third correction value based on the difference between the current pressure ratio and the target pressure ratio. Finally, it determines the compressor speed at the next moment based on the current compressor speed, the first correction value, the second correction value, and the third correction value. Therefore, this method adjusts the compressor speed at the next moment based on the correction values ​​between the current indoor temperature and the set temperature, the correction values ​​between the current temperature of the indoor heat exchanger and the target temperature of the indoor heat exchanger, the correction values ​​between the current pressure ratio and the target pressure ratio, and the current compressor speed, thereby achieving efficient and energy-saving operation of the compressor.

[0086] Corresponding to the above embodiments, the present invention also proposes a computer-readable storage medium.

[0087] The present invention provides a computer-readable storage medium having a compressor capacity control program stored thereon, which, when executed by a processor, implements the compressor capacity control method described above.

[0088] The computer-readable storage medium of this invention, by executing the compressor capacity control method, can adjust the compressor speed to achieve efficient and energy-saving operation of the compressor.

[0089] Corresponding to the above embodiments, the present invention also proposes an air conditioner.

[0090] like Figure 11 As shown, the air conditioner 100 of the present invention may include: a memory 110, a processor 120, and a compressor capacity control program stored in the memory 110 and executable on the processor 120. When the processor 120 executes the compressor capacity control program, it implements the compressor capacity control method described above.

[0091] The air conditioner of this invention, by executing the above-described compressor capacity control method, can adjust the compressor speed to achieve efficient and energy-saving operation of the compressor.

[0092] Corresponding to the above embodiments, the present invention also proposes a compressor capacity control device.

[0093] like Figure 12As shown, the compressor capacity control device 200 of this embodiment may include: a first acquisition module 210, a second acquisition module 220, a third acquisition module 230, and a determination module 240.

[0094] The first acquisition module 210 acquires the current indoor temperature and the set temperature. The second acquisition module 220 acquires the current compressor speed, the current indoor heat exchanger temperature, the target temperature of the indoor heat exchanger, the current pressure ratio, and the target pressure ratio when the first temperature difference between the current indoor temperature and the set temperature exceeds a preset temperature range. The third acquisition module 230 acquires a first correction value based on the first temperature difference, a second correction value based on the difference between the current indoor heat exchanger temperature and the target temperature of the indoor heat exchanger, and a third correction value based on the difference between the current pressure ratio and the target pressure ratio. The determination module 240 determines the compressor speed at the next moment based on the current compressor speed, the first correction value, the second correction value, and the third correction value.

[0095] According to one embodiment of the present invention, the determining module 240 determines the compressor speed at the next moment based on the current compressor speed, a first correction value, a second correction value, and a third correction value. Specifically, it is used to: obtain the current operating condition of the compressor; determine the correction coefficients of the first correction value, the second correction value, and the third correction value based on the current operating condition; determine the compressor speed correction value based on the first correction value and its corresponding correction coefficient, the second correction value and its corresponding correction coefficient, and the third correction value and its corresponding correction coefficient; and determine the compressor speed at the next moment based on the current compressor speed and the compressor speed correction value.

[0096] According to one embodiment of the present invention, the determining module 240 determines the compressor speed at the next moment using the following formula:

[0097] in, This indicates the compressor speed at the next moment. Indicates the current compressor speed. This indicates the compressor speed correction value. This indicates the second correction value. This represents the first correction value. This indicates the third correction value. , and These represent the corresponding correction coefficients.

[0098] According to one embodiment of the present invention, the third acquisition module 230 acquires the first correction value using the following formula:

[0099] in, This represents the first correction value. This represents the difference between the current indoor temperature and the set temperature. This represents the difference between the indoor temperature and the set temperature at the previous moment. This represents the difference between the indoor temperature at the previous moment and the set temperature. , and These represent the proportional coefficient, integral coefficient, and differential coefficient, respectively.

[0100] According to one embodiment of the present invention, the third acquisition module 230 acquires the second correction value using the following formula:

[0101] in, This indicates the second correction value. This represents the difference between the current temperature of the indoor heat exchanger and the target temperature of the indoor heat exchanger. This represents the difference between the temperature of the indoor heat exchanger at the previous moment and the target temperature of the indoor heat exchanger. This represents the difference between the temperature of the indoor heat exchanger at the previous moment and the target temperature of the indoor heat exchanger. , and These represent the proportional coefficient, integral coefficient, and differential coefficient, respectively.

[0102] According to one embodiment of the present invention, the third acquisition module 230 is further configured to determine a proportionality coefficient based on the difference between the current temperature of the indoor heat exchanger and the target temperature of the indoor heat exchanger. Integral coefficient and differential coefficients .

[0103] According to one embodiment of the present invention, the third acquisition module 230 acquires the third correction value using the following formula:

[0104] in, This indicates the third correction value. This represents the difference between the current pressure ratio and the target pressure ratio. This represents the difference between the pressure ratio at the previous moment and the target pressure ratio. This represents the difference between the pressure ratio at the previous moment and the target pressure ratio. , and These represent the proportional coefficient, integral coefficient, and differential coefficient, respectively.

[0105] According to one embodiment of the present invention, the second acquisition module 220 acquires the target pressure ratio, specifically for: acquiring the current outdoor ambient temperature and the current air volume of the indoor fan; and determining the target pressure ratio based on the current compressor speed, the set temperature, the current outdoor ambient temperature, and the current air volume of the indoor fan.

[0106] According to one embodiment of the present invention, the determining module 240 is further configured to: determine the compressor speed at the next moment based on the current compressor speed and the first correction value when the first temperature difference does not exceed the preset temperature range.

[0107] According to one embodiment of the present invention, before obtaining the compressor speed at the next moment, the determining module 240 is further configured to: reduce the current compressor speed when the compressor outlet pressure exceeds the high pressure protection threshold; and increase the current compressor speed when the compressor inlet pressure is lower than the low pressure protection threshold.

[0108] It should be noted that for details not disclosed in the compressor capacity control device of this embodiment, please refer to the details disclosed in the compressor capacity control method of this embodiment, which will not be repeated here.

[0109] According to an embodiment of the compressor capacity control device of the present invention, a first acquisition module acquires the current indoor temperature and a set temperature. A second acquisition module acquires the current compressor speed, the current temperature of the indoor heat exchanger, the target temperature of the indoor heat exchanger, the current pressure ratio, and the target pressure ratio when a first temperature difference between the current indoor temperature and the set temperature exceeds a preset temperature range. A third acquisition module acquires a first correction value based on the first temperature difference, a second correction value based on the difference between the current temperature of the indoor heat exchanger and the target temperature of the indoor heat exchanger, and a third correction value based on the difference between the current pressure ratio and the target pressure ratio. A determining module determines the compressor speed at the next moment based on the current compressor speed, the first correction value, the second correction value, and the third correction value. Thus, the device adjusts the compressor speed at the next moment based on the correction values ​​between the current indoor temperature and the set temperature, the correction values ​​between the current temperature of the indoor heat exchanger and the target temperature of the indoor heat exchanger, the correction values ​​between the current pressure ratio and the target pressure ratio, and the current compressor speed, thereby achieving efficient and energy-saving operation of the compressor.

[0110] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0111] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can 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, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0112] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0113] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0114] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0115] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A compressor capacity control method, characterized in that, include: Get the current indoor temperature and the set temperature; When the first temperature difference between the current indoor temperature and the set temperature exceeds the preset temperature range, the current compressor speed, the current temperature of the indoor heat exchanger, the target temperature of the indoor heat exchanger, the current pressure ratio, and the target pressure ratio are obtained. A first correction value is obtained based on the first temperature difference, a second correction value is obtained based on the difference between the current temperature of the indoor heat exchanger and the target temperature of the indoor heat exchanger, and a third correction value is obtained based on the difference between the current pressure ratio and the target pressure ratio. The compressor speed at the next moment is determined based on the current compressor speed, the first correction value, the second correction value, and the third correction value; Determining the compressor speed at the next moment based on the current compressor speed, the first correction value, the second correction value, and the third correction value includes: Obtain the current operating status of the compressor; The correction coefficients for the first correction value, the second correction value, and the third correction value are determined based on the current operating conditions. The compressor speed correction value is determined based on the first correction value and its corresponding correction coefficient, the second correction value and its corresponding correction coefficient, and the third correction value and its corresponding correction coefficient. The compressor speed at the next moment is determined based on the current compressor speed and the compressor speed correction value; The compressor speed at the next moment is determined by the following formula: in, This indicates the compressor speed at the next moment. This indicates the current compressor speed. This indicates the compressor speed correction value. This represents the second correction value. This represents the first correction value. This represents the third correction value. , and These represent the corresponding correction coefficients.

2. The method according to claim 1, characterized in that, The first correction value is obtained using the following formula: in, This represents the first correction value. This represents the difference between the current indoor temperature and the set temperature. This represents the difference between the previous indoor temperature and the set temperature. This represents the difference between the indoor temperature at the previous moment and the set temperature. , and These represent the proportional coefficient, integral coefficient, and differential coefficient, respectively.

3. The method according to claim 1, characterized in that, The second correction value is obtained using the following formula: in, This represents the second correction value. This represents the difference between the current temperature of the indoor heat exchanger and the target temperature of the indoor heat exchanger. This represents the difference between the temperature of the indoor heat exchanger at the previous moment and the target temperature of the indoor heat exchanger. This represents the difference between the temperature of the indoor heat exchanger at the previous moment and the target temperature of the indoor heat exchanger. , and These represent the proportional coefficient, integral coefficient, and differential coefficient, respectively.

4. The method according to claim 3, characterized in that, The proportionality coefficient is determined based on the difference between the current temperature of the indoor heat exchanger and the target temperature of the indoor heat exchanger. Integral coefficient and differential coefficients .

5. The method according to claim 1, characterized in that, The third correction value is obtained using the following formula: in, This represents the third correction value. This represents the difference between the current pressure ratio and the target pressure ratio. This represents the difference between the pressure ratio at the previous moment and the target pressure ratio. This represents the difference between the pressure ratio at the previous time step and the target pressure ratio. , and These represent the proportional coefficient, integral coefficient, and differential coefficient, respectively.

6. The method according to claim 1, characterized in that, Obtaining the target pressure ratio includes: Obtain the current outdoor ambient temperature and the current airflow of the indoor fan; The target pressure ratio is determined based on the current compressor speed, the set temperature, the current outdoor ambient temperature, and the current indoor fan airflow.

7. The method according to any one of claims 1-6, characterized in that, Also includes: When the first temperature difference does not exceed the preset temperature range, the compressor speed at the next moment is determined based on the current compressor speed and the first correction value.

8. The method according to any one of claims 1-6, characterized in that, Before obtaining the compressor speed at the next moment, the method further includes: When the compressor outlet pressure exceeds the high-pressure protection threshold, reduce the current compressor speed; When the inlet pressure of the compressor is lower than the low-pressure protection threshold, the current compressor speed is increased.

9. A computer-readable storage medium, characterized in that, It stores a compressor capacity control program, which, when executed by a processor, implements the compressor capacity control method according to any one of claims 1-8.

10. An air conditioner, characterized in that, The system includes a memory, a processor, and a compressor capacity control program stored in the memory and executable on the processor. When the processor executes the compressor capacity control program, it implements the compressor capacity control method according to any one of claims 1-8.

11. A compressor capacity control device, suitable for executing the compressor capacity control method according to any one of claims 1-8, characterized in that, include: The first acquisition module is used to acquire the current indoor temperature and the set temperature; The second acquisition module is used to acquire the current compressor speed, the current temperature of the indoor heat exchanger, the target temperature of the indoor heat exchanger, the current pressure ratio, and the target pressure ratio when the first temperature difference between the current indoor temperature and the set temperature exceeds the preset temperature range. The third acquisition module is used to acquire a first correction value based on the first temperature difference, acquire a second correction value based on the difference between the current temperature of the indoor heat exchanger and the target temperature of the indoor heat exchanger, and acquire a third correction value based on the difference between the current pressure ratio and the target pressure ratio. The determining module is used to determine the compressor speed at the next moment based on the current compressor speed, the first correction value, the second correction value, and the third correction value.

Images