Air conditioner

Abstract

The invention discloses an air conditioner which comprises a controller, at least one control item is preset in the controller, and a first target value is set; the system also comprises at least one control item detection unit which is connected with the controller, detects the real-time parameters of the control items in real time, and transmits the real-time parameters to the controller. The control system further comprises at least one driving part which is a frequency conversion compressor and / or an expansion valve, is connected with the controller and is controlled by the controller to change driving parameters of the driving part so that the real-time parameters of the control items can be increased or decreased. The controller is configured to circularly obtain and store the real-time parameters; acquiring a current difference value which is a difference value between the first target value and the real-time parameter; acquiring a historical difference value which is a difference value between the real-time parameter and a historical parameter; the historical parameters are obtained from the real-time parameters before the current real-time parameters; and controlling the driving piece according to the current difference value and the historical difference value. And through predictive control, overshoot is reduced, and comfort is improved.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more specifically to an air conditioner. Background Technology

[0002] An air conditioner comprises a refrigerant circulation system and an electronic control system. The refrigerant circulation system includes system piping, a compressor, etc., and must operate within a specific temperature and pressure range to function properly. The electronic control system includes the control board, etc., and must operate within a specific temperature, voltage, and current range to function properly. For example, the compressor discharge temperature must be lower than the discharge temperature requirement specified in the compressor's datasheet for reliable operation; the system's high and low pressures must be within the compressor's required range for operation; and the compressor current and input current must be within the design range of the control board to avoid damage to the control board, etc.

[0003] System protection is a general term for protective control of system piping, compressors, electronic control boards, and other components. Current system protection is based on target control, such as compressor frequency reduction, expansion valve enlargement or reduction, and compressor frequency reduction when the exhaust temperature exceeds a target value, or current reaching a target value. While these control methods can protect system piping, compressors, and electronic control boards from damage during operation, they can lead to significant parameter overshoot, resulting in large system fluctuations and even shutdowns due to delayed protection actions and parameter exceedances, thus affecting system stability and user comfort.

[0004] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Summary of the Invention

[0005] In response to the problems mentioned in the background art, such as the large system fluctuations, poor stability, and impact on comfort caused by using target value control methods for air conditioning system parameters, this invention proposes an air conditioner that reduces overshoot, lowers system fluctuations, and improves operational stability through a predictive operating state control method, thereby enhancing user comfort.

[0006] To achieve the above-mentioned objectives, the present invention employs the following technical solution:

[0007] An air conditioner includes at least one drive element, a controller, and at least one control item detection unit;

[0008] The drive component is a variable frequency compressor and / or an expansion valve.

[0009] The controller has at least one preset control item, and sets a first target value for the control item; the drive unit is connected to the controller, and the controller controls the change of its drive parameters, so that the real-time parameter of the control item increases or decreases.

[0010] The control item detection unit is connected to the controller and is used to detect the real-time parameters of the control item and transmit them to the controller.

[0011] The controller is configured as follows:

[0012] The real-time parameters are obtained and saved repeatedly.

[0013] Obtain the current difference, which is the difference between the first target value and the real-time parameter; obtain the historical difference, which is the difference between the real-time parameter and the historical parameter; the historical parameter is obtained from each of the real-time parameters preceding the current real-time parameter;

[0014] The drive unit is controlled based on the current difference and the historical difference.

[0015] The air conditioner of this invention cyclically acquires and saves real-time parameters of control items, acquires the current difference value to identify the gap between the current real-time parameter and the first target value, acquires historical differences to identify the change range of the real-time parameter, predicts the direction and speed of change of the real-time parameter based on the current difference value and the historical difference value, and then controls the operation of the drive component according to the prediction to make it reach the first target value as soon as possible, and gradually slows down the approach speed in the process of approaching the first target value to prevent overshoot, improve the stability and reliability of control items, reduce system volatility, and thus improve the stability and reliability of air conditioner operation, reduce downtime rate, and improve comfort.

[0016] In some specific embodiments, the controller is preset with a first correction coefficient and a second correction coefficient;

[0017] The controller is also configured to:

[0018] The sum of the differences equals the product of the first correction factor and the current difference plus the product of the second correction factor and the historical difference;

[0019] If the sum of the differences is negative, the driving parameters are changed according to the sum of the differences, thereby changing the trend of the real-time parameters of the control item.

[0020] If the sum of the differences is zero, the driver is controlled to maintain the original driving parameters and is prohibited from changing the driving parameters.

[0021] If the sum of the differences is positive, the drive unit is controlled to operate in normal mode; the predictive control is not performed during normal mode operation.

[0022] In this embodiment, the air conditioner controls the drive component to change the direction of its drive parameters according to the direction of the difference and sum values. The prediction of real-time parameters is added to the adjustment of drive parameters to prevent overshoot of real-time parameters, improve the stability and reliability of control items, and thus improve the stability and reliability of air conditioner operation.

[0023] In some specific embodiments, the controller is configured as follows:

[0024] The first target value is the high point threshold; the current difference is equal to the first target value minus the real-time parameter; the historical difference is equal to the historical parameter minus the real-time parameter.

[0025] In this embodiment, the air conditioner defines the current difference and historical difference of the high point threshold, ensuring that the sign of the difference sum can predict the change trend of real-time parameters and improve the accuracy of predictive control.

[0026] In some specific embodiments, the controller is configured as follows:

[0027] The first target value is a low point threshold; the current difference is equal to the current real-time parameter minus the first target value; the historical difference is equal to the current real-time parameter minus the historical parameter.

[0028] In this embodiment, the air conditioner defines the current difference and historical difference of the low point threshold, ensuring that the sign of the difference sum can predict the change trend of real-time parameters and improve the accuracy of predictive control.

[0029] In some specific embodiments, the controller has a preset acquisition period, which is the period for cyclically acquiring the real-time parameters;

[0030] The historical parameter is the real-time parameter that is at least one acquisition cycle away from the current real-time parameter, and the number of acquisition cycles away from the current real-time parameter is determined according to the change trend of each of the saved real-time parameters.

[0031] In some specific embodiments, the controller has a preset gain constant and is configured as follows:

[0032] When the sum of the differences is negative, the controller controls the drive parameters to change the absolute value of the quotient of the sum of the differences divided by the gain constant.

[0033] The air conditioner in this embodiment integrates judgment and control based on the difference and the change of driving parameters, making the control more efficient and improving the control and regulation efficiency.

[0034] In this embodiment, the air conditioner adjusts the magnitude of the difference between historical parameters and the adjustment values, thereby adjusting the amplitude of the driving parameters and improving adjustment efficiency.

[0035] In some specific embodiments, the controller has a preset gain constant and is configured as follows:

[0036] When the sum of the differences is negative, the controller controls the drive parameters to change the absolute value of the quotient of the sum of the differences divided by the gain constant.

[0037] In this embodiment, the change in the air conditioner control drive parameter is the absolute integer value of the difference and the quotient divided by the gain constant. This solves the problem that the microcontroller cannot control the drive components to change the decimal drive parameters, thus improving the reliability and stability of the control.

[0038] In some specific embodiments, the fractional part of the sum of the differences divided by the gain constant is added to the sum of the differences in the next cycle.

[0039] In this embodiment, the air conditioner adds the fractional part of the difference sum that does not participate in the adjustment of the drive parameters to the difference sum in the next round, so that it participates in the adjustment of the drive parameters in the next round, thereby reducing the cumulative error, improving the control efficiency and stability of the control items, and thus improving the stability of the air conditioner's operation.

[0040] In some specific embodiments, the controller is preset with a second target value, a third target value, a first hysteresis, a second hysteresis, and an adjustment value, and configured as follows:

[0041] When the real-time parameter reaches or exceeds the second target value, the driving parameter is controlled to change the absolute integer value of the adjustment value or the quotient of the difference and the gain constant.

[0042] When the sum of the differences is positive, the real-time parameter is between the first hysteresis value of the second target value and the third target value, and the driver is controlled to maintain the operation of its driving parameters and is prohibited from changing; when the real-time parameter is lower than the second hysteresis value of the third target value, the driver is controlled to operate in the normal mode; when the real-time parameter is between the second target value and the first hysteresis value of the second target value, or between the third target value and the second hysteresis value of the third target value, the driver is controlled to maintain the original operating state.

[0043] The air conditioner in this embodiment adds target control, combined with predictive control, and controls the operation of the drive unit according to the priority of adjusting drive parameters, maintaining the original drive parameters, and normal mode. That is, if either target control or predictive control satisfies the condition of adjusting drive parameters, the drive unit will operate by adjusting drive parameters; if neither target control nor predictive control satisfies the condition of adjusting drive parameters, the drive unit will operate by maintaining the original drive parameters as long as either condition of maintaining the original drive parameters is met; if neither the condition of adjusting drive parameters nor the condition of maintaining the original drive parameters is met, the drive unit will operate in normal mode. This makes the operation of the drive unit more stable and reliable, and keeps it away from more severe operating conditions.

[0044] In some specific embodiments, the driving component is the compressor, which is connected to the controller and its operation is controlled by the controller;

[0045] The controller has a preset fourth target value, the first target value is equal to the second target value, and is configured as follows:

[0046] The real-time parameter is compared with the fourth target value; if the real-time parameter reaches or exceeds the fourth target value, the compressor is controlled to stop.

[0047] The air conditioner in this embodiment simplifies the combination of target control and predictive control by setting a first target value equal to a second target value, and improves the reliability of control; by setting a fourth target value, the system operating limits are limited, compressor damage is prevented, and maintenance and repair costs are reduced.

[0048] Other features and advantages of the present invention will become clearer after reading the detailed embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0049] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0050] Figure 1 This is a schematic diagram of the components and connections according to an embodiment;

[0051] Figure 2 This is a schematic diagram of the components and connections according to an embodiment;

[0052] Figure 3 This is a schematic diagram of the control flow according to an embodiment;

[0053] Figure 4 This is a schematic diagram of the control flow according to an embodiment;

[0054] Figure 5 This is a schematic diagram of the control flow according to an embodiment;

[0055] Figure 6 This is a schematic diagram of the target value number axis logic according to an embodiment;

[0056] Figure 7 This is a schematic diagram of the target value number axis logic according to an embodiment;

[0057] Figure 8 This is a schematic diagram of the target value number axis logic according to an embodiment;

[0058] Figure 9 This is a schematic diagram of the control flow according to an embodiment;

[0059] Figure 10 This is a schematic diagram of the control flow according to an embodiment;

[0060] Figure 11 A schematic diagram illustrating the technical effects of target control in existing technologies;

[0061] Figure 12 This is a schematic diagram illustrating the technical effects according to the embodiments;

[0062] Figure 13 This is a schematic diagram of the control flow according to an embodiment;

[0063] Figure 14 This is a schematic diagram of the control flow according to an embodiment;

[0064] Figure 15 This is a schematic diagram of the control flow according to an embodiment;

[0065] Figure 16 This is a schematic diagram of the control flow according to an embodiment;

[0066] Figure 17 This is a schematic diagram of the control flow according to an embodiment;

[0067] Figure 18 This is a schematic diagram of the control flow according to an embodiment.

[0068] Figure label,

[0069] 1. Control item detection unit; 2. Controller; 3. Drive unit; 11. Exhaust temperature sensor; 12. Intake temperature sensor; 13. High pressure sensor; 14. Low pressure sensor; 15. Condensation temperature sensor; 16. Evaporation temperature sensor; 31. Compressor; 32. Expansion valve. Detailed Implementation

[0070] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0071] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0072] 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. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "multiple" means two or more.

[0073] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0074] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0075] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0076] Air conditioners execute a refrigeration cycle using a compressor, condenser, expansion valve, and evaporator. The refrigeration cycle involves a series of processes, including compression, condensation, expansion, and evaporation, to cool or heat an indoor space.

[0077] Low-temperature, low-pressure refrigerant enters the compressor, which compresses it into a high-temperature, high-pressure refrigerant gas and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0078] The expansion valve expands the high-temperature, high-pressure liquid refrigerant that condenses in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the expanded refrigerant in the expansion valve and returns the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves its cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material being cooled. Throughout the cycle, the air conditioner regulates the temperature of the indoor space.

[0079] The outdoor unit of an air conditioner refers to the part of the refrigeration cycle that includes the compressor and the outdoor heat exchanger. The indoor unit of an air conditioner includes the indoor heat exchanger, and an expansion valve can be provided in either the indoor or outdoor unit.

[0080] The indoor and outdoor heat exchangers function as either condensers or evaporators. When the indoor heat exchanger is used as a condenser, the air conditioner functions as a heater in heating mode; when the indoor heat exchanger is used as an evaporator, the air conditioner functions as a cooler in cooling mode.

[0081] The air conditioner also includes multiple temperature detection units and pressure detection units, used to detect the compressor 31 discharge temperature, suction temperature, evaporator temperature, condenser temperature, high pressure, low pressure, etc.

[0082] The air conditioner also includes a controller 2, which is connected to each temperature detection unit and each pressure detection unit respectively. It has preset control thresholds and cyclically acquires the detected exhaust temperature, suction temperature, evaporator temperature, condenser temperature, high pressure, low pressure, etc., and compares them with the preset control thresholds. Based on the comparison results, it controls the operating frequency of the compressor 31 and / or the opening degree of the expansion valve 32.

[0083] Reference Figure 1 , Figure 2 , Figure 3 The air conditioner of the present invention includes a controller 2, which has at least one preset control item, which may be one or more of the following: exhaust temperature, intake temperature, evaporation temperature, condensation temperature, high pressure, low pressure, etc., and a first target value is set for each preset control item.

[0084] The air conditioner of the present invention further includes at least one control item detection unit 1, which is connected to the controller 2 and is used to detect the real-time parameters of the control item and transmit them to the controller 2. The control item detection unit 1 may be an exhaust temperature sensor 11, an intake temperature sensor 12, a high pressure sensor 13, a low pressure sensor 14, a condensing temperature sensor 15, and an evaporating temperature sensor 16, which are used to detect the exhaust temperature, intake temperature, high pressure, low pressure, condensing temperature, and evaporating temperature, respectively.

[0085] The air conditioner of the present invention also includes at least one drive unit 3, which may be a compressor 31 and / or an expansion valve 32, which is connected to a controller 2 and whose operating parameters are controlled by the controller 2.

[0086] Controller 2 is configured as follows:

[0087] S1. Loop through and save the real-time parameters of the control items;

[0088] S2. Obtain the current difference, which is the difference between the first target value and the current real-time parameter; obtain the historical difference, which is the difference between the current real-time parameter and the historical parameter; the historical parameter is obtained from the real-time parameters before the current real-time parameter.

[0089] S3. Control the operation of drive component 3 based on the current difference and historical difference.

[0090] That is, the controller 2 executes in a cyclical manner according to the sequence of S1, S2, and S3, and controls the operation of the drive unit 3 according to the real-time parameters detected by the control item detection unit 1.

[0091] The air conditioner of this invention cyclically acquires and saves real-time parameters of control items, acquires the current difference value to identify the gap between the current real-time parameter and the first target value, acquires historical differences to identify the change range of the real-time parameter, predicts the change direction and speed of the real-time parameter based on the current difference value and historical difference value, and then controls the operation of the drive component 3 according to the prediction to make it reach the first target value as soon as possible, and gradually slows down the approach speed in the process of approaching the first target value to prevent overshoot, improve the stability and reliability of control items, reduce system volatility, and thus improve the stability and reliability of air conditioner operation, reduce downtime rate, and improve comfort.

[0092] Of course, the control item of the air conditioner can also be the operating current; then the control item detection unit 1 can also be a current detection module, which controls the frequency of the compressor 31 based on the real-time parameters of the measured current value.

[0093] The specific structure and control process of the air conditioner of the present invention will be described in detail below through specific embodiments.

[0094] In some specific embodiments, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 The controller 2 is pre-set with a first correction coefficient and a second correction coefficient, and the controller 2 is also configured with:

[0095] S31. Obtain the sum of differences, which is the product of the first correction coefficient and the current difference plus the product of the second correction coefficient and the historical difference; that is, the sum of differences is equal to the sum of the product of the first correction coefficient and the current difference plus the product of the second correction coefficient and the historical difference.

[0096] S32. Control the drive unit 3 according to the sum of the differences, specifically including:

[0097] S321. If the sum of the differences is negative, change the driving parameters of drive unit 3 according to the sum of the differences, and change the trend of the real-time parameters of the control item.

[0098] That is, if the current real-time parameter has a trend of approaching or exceeding the first target value, or exceeds the first target value and moves away from the first target value; then when the real-time parameter has a trend of approaching the first target value, the control changes the driving parameter to slow down the approach or stop the approach or move away from the first target value in the opposite direction; when the real-time parameter has a trend of exceeding the first target value, the control changes the driving parameter to stop the real-time parameter from exceeding or moving away from the first target value in the opposite direction; when the real-time parameter exceeds the first target value and moves away from the first target value, the control changes the driving parameter to make the real-time parameter have a trend of approaching the first target value.

[0099] For example, when the exhaust temperature gradually rises to the first target value and the difference is negative, the compressor 31 is controlled to reduce its frequency, so that the exhaust temperature slows down, stops rising, or decreases.

[0100] S322. If the sum of the differences is zero, the control drive 3 maintains the original drive parameters and prohibits changes to its drive parameters; that is, regardless of whether the real-time parameters have reached the first target value, reached the first target value, or exceeded the first target value, as long as the sum of the differences is zero, the drive parameters of the control drive 3 remain unchanged.

[0101] S323. If the sum of the differences is positive, the control drive 3 operates in normal mode. In normal mode, the control drive parameters are not based on the sum of the differences; for example, the operating frequency of compressor 31 is increased to increase the exhaust temperature.

[0102] In this embodiment, the air conditioner controls the drive unit 3 to change the direction of its drive parameters according to the direction of the difference and sum values. The prediction of the real-time parameters is added to the adjustment of the drive parameters to prevent overshoot of the real-time parameters, improve the stability and reliability of the control items, and thus improve the stability and reliability of the air conditioner operation.

[0103] In some specific embodiments, refer to Figure 6 , Figure 7 Controller 2 is configured as follows:

[0104] The first target value is the high point threshold; that is, when the real-time parameter reaches or exceeds the first target value, the driving parameter change of the drive component 3 must be reversed to make the real-time parameter change in the opposite direction and fall below the first target value; the current difference is equal to the first target value minus the current real-time parameter; the historical difference is equal to the historical parameter minus the current real-time parameter.

[0105] In this embodiment, the air conditioner defines the current difference and historical difference of the high point threshold, ensuring that the sign of the difference sum can predict the change trend of real-time parameters and improve the accuracy of predictive control.

[0106] In some specific embodiments, refer to Figure 6 , Figure 8 Controller 2 is configured as follows:

[0107] The first target value is the low point threshold; that is, when the real-time parameter reaches or falls below the first target value, the driving parameter change of the drive component 3 must be reversed to make the real-time parameter change in the opposite direction and exceed the first target value; the current difference is equal to the current real-time parameter minus the first target value; the historical difference is equal to the current real-time parameter minus the historical parameter.

[0108] In this embodiment, the air conditioner defines the current difference and historical difference of the low point threshold, ensuring that the sign of the difference sum can predict the change trend of real-time parameters and improve the accuracy of predictive control.

[0109] In some specific embodiments, refer to Figure 6 , Figure 7 , Figure 8 Controller 2 has a preset gain constant and is configured as follows:

[0110] When the sum of the differences is negative, controller 2 controls the change of the drive parameters by the absolute value of the quotient of the sum of the differences divided by the gain constant, and the direction is opposite.

[0111] The gain constant was obtained through experimental verification.

[0112] Right now,

[0113] Δy=|y / k gain |

[0114] In the formula,

[0115] Δy is the adjustment amount of the driving parameter;

[0116] y represents the sum of differences;

[0117] Kgain is the gain constant.

[0118] The air conditioner in this embodiment integrates judgment and control based on the difference and the change of driving parameters, making the control more efficient and improving the control and regulation efficiency.

[0119] In some specific embodiments, refer to Figure 6 , Figure 7 , Figure 8 Controller 2 has a preset gain constant and is configured as follows:

[0120] When the sum of the differences is negative, controller 2 controls the change of the drive parameters to the integer absolute value of the quotient of the sum of the differences divided by the gain constant, and the direction is the opposite.

[0121] The gain constant was obtained through experimental verification.

[0122] Right now,

[0123] Δy=|[y / k gain ]|

[0124] Δy is the adjustment amount of the driving parameter;

[0125] y represents the sum of differences;

[0126] Kgain is the gain constant.

[0127] In this embodiment, the change in the air conditioner control drive parameter is the absolute integer value of the difference and the quotient divided by the gain constant. This solves the problem that the microcontroller 2 cannot control the drive component 3 to change the decimal drive parameter, thereby improving the reliability and stability of the control.

[0128] In some specific embodiments, referring to the figure, the fractional part of the difference sum divided by the gain constant is added to the difference sum of the next cycle, that is,

[0129] dy=y-Δy*k gain

[0130] y = y + dy;

[0131] In the formula, dy is the fractional part of the difference and the quotient of the sum divided by the gain constant.

[0132] In this embodiment, the air conditioner adds the fractional part of the difference sum that does not participate in the adjustment of the drive parameters to the difference sum in the next round, so that it participates in the adjustment of the drive parameters in the next round, thereby reducing the cumulative error, improving the control efficiency and stability of the control items, and thus improving the stability of the air conditioner's operation.

[0133] In some specific embodiments, the controller 2 has a preset acquisition period, which is the period for cyclically acquiring real-time parameters; that is, real-time parameters are acquired once every acquisition period.

[0134] Historical parameters are factual parameters that are at least one acquisition period away from the current real-time parameter; that is, if the acquisition period is T and the number of acquisition periods is n, then the historical parameter is a factual parameter that is T*n away from the current real-time parameter acquisition time; that is, the historical parameter is the (n+1)th real-time parameter saved counting backward from the current factual parameter.

[0135] The number of historical parameter acquisition cycles relative to the current real-time parameter is determined based on the changing trends of the saved real-time parameters.

[0136] Specifically, when the changes in each real-time parameter are small, the historical parameters are taken from real-time parameters that are far from the current real-time parameters, thereby improving the efficiency of real-time parameter adjustment.

[0137] In this embodiment, the air conditioner adjusts the magnitude of the difference between historical parameters and the adjustment values, thereby adjusting the amplitude of the driving parameters and improving adjustment efficiency.

[0138] In some specific embodiments, refer to Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 Controller 2 is preset with a second target value, a third target value, a first hysteresis, a second hysteresis, and an adjustment value, and is configured as follows:

[0139] When the current real-time parameter reaches or exceeds the second target value, the control driving parameter changes the absolute integer value of the adjustment value or the sum of the difference divided by the gain constant; specifically, when the current real-time parameter reaches or exceeds the second target value and the sum of the differences is non-negative, the control driving parameter changes the adjustment value; when the current real-time parameter reaches or exceeds the second target value and the sum of the differences is negative, the control driving parameter changes the absolute integer value of the sum of the differences divided by the gain constant.

[0140] When the current real-time parameters are between the first hysteresis value and the third target value of the second target value, if the sum of the differences is negative, the control drive parameters are adjusted by the absolute integer value of the quotient of the sum of the differences divided by the gain constant; if the sum of the differences is zero and positive, the control drive parameters are kept unchanged and modification of the drive parameters is prohibited.

[0141] When the current real-time parameter is lower than the second difference value of the third target value, if the difference sum is positive, the control drive 3 operates in normal mode; if the difference sum is zero or negative, the control drive 3 maintains the original drive parameter operation or adjusts the absolute value of the quotient of the difference sum divided by the gain constant to operate as an integer.

[0142] When the current real-time parameters are between the first backlash between the second target value and the second target value, or between the second backlash between the third target value and the third target value, if the sum of the differences is positive, the operating state of drive unit 3 is maintained; if the sum of the differences is zero or negative, drive unit 3 is controlled to maintain the original drive parameters or adjust the absolute value of the quotient of the sum of the differences divided by the gain constant. Specifically, when the sum of the differences is positive, if drive unit 3 adjusts its drive parameters, it continues to adjust the drive parameters; if drive unit 3 maintains its drive parameters, it continues to maintain the drive parameters; if drive unit 3 operates in normal mode, it continues to operate in normal mode.

[0143] In this embodiment, the air conditioner incorporates target control, combined with predictive control, and controls the operation of the drive unit 3 according to the priority of adjusting drive parameters, maintaining the original drive parameters, and operating in normal mode. That is, if either target control or predictive control satisfies the condition for adjusting drive parameters, the drive parameters of the drive unit 3 are adjusted and it operates. If neither target control nor predictive control satisfies the condition for adjusting drive parameters, the drive unit 3 is controlled to maintain the original drive parameters as long as either condition for maintaining the original drive parameters is met. If neither the conditions for adjusting drive parameters nor maintaining the original drive parameters are met, the drive unit 3 is controlled to operate in normal mode. This makes the operation of the drive unit 3 more stable and reliable, and keeps it away from more severe operating conditions.

[0144] Reference Figure 11 , Figure 12The figures show the system fluctuation effect diagrams of the prior art's target control and the predictive control combined with target control of this application, respectively. It can be seen that the air conditioner of this application exhibits higher system stability and efficiency, and less fluctuation during operation.

[0145] In some specific embodiments, refer to Figure 6 , Figure 7 , Figure 8 The first target value is equal to the second target value.

[0146] The air conditioner in this embodiment simplifies the combination of target control and predictive control by making the first target value equal to the second target value, and improves the reliability of control.

[0147] In some specific embodiments, refer to Figure 2 , Figure 6 , Figure 7 , Figure 8 , Figure 9 The driving component is a variable frequency compressor 31, which is connected to the controller 2 and its operation is controlled by the controller 2.

[0148] Controller 2 has a preset fourth target value, configured as follows:

[0149] Compare the real-time parameters with the fourth target value; if the real-time parameters reach or exceed the fourth target value, control the compressor 31 to stop.

[0150] The air conditioner in this embodiment limits the system's operating limits by setting a fourth target value, preventing damage to the compressor 31 and reducing maintenance and repair costs.

[0151] In some specific embodiments, refer to Figure 13 , Figure 14 , Figure 15 The driving component 3 is the compressor 31; the control items are any one or more of the exhaust temperature, high pressure, and condenser temperature; when the real-time parameter of the control item reaches or exceeds the first target value or the difference is negative, the compressor 31 is controlled to operate at a reduced frequency, and the reduction in frequency is the integer absolute value of the quotient of the adjustment value or the difference divided by the gain constant.

[0152] If the real-time parameter of the control item reaches or exceeds the fourth target value, control compressor 31 to stop.

[0153] In some specific embodiments, refer to Figure 16 , Figure 17 , Figure 18The driving component 3 is an expansion valve 32 and a compressor 31; the control item is any one or more of the suction temperature, low pressure, and evaporator temperature. When the real-time parameter of the control item reaches or exceeds the first target value or the difference is negative, the opening degree of the expansion valve 32 is increased. The increase in opening degree is the integer absolute value of the quotient of the adjustment value or the difference divided by the gain constant.

[0154] If the real-time parameter of the control item reaches or exceeds the fourth target value, then control compressor 31 to stop.

[0155] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0156] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An air conditioner, characterized in that, include: At least one drive component, which is a variable frequency compressor and / or an expansion valve; The controller has at least one preset control item and sets a first target value for the control item; the drive is connected to the controller and is controlled by the controller to change its drive parameters, thereby increasing or decreasing the real-time parameter of the control item. At least one control item detection unit is connected to the controller for detecting the real-time parameters of the control item and transmitting them to the controller. The controller is configured as follows: The real-time parameters are obtained and saved repeatedly. Obtain the current difference, which is the difference between the first target value and the real-time parameter; obtain the historical difference, which is the difference between the real-time parameter and the historical parameter; the historical parameter is obtained from each of the real-time parameters preceding the current real-time parameter; The drive unit is controlled based on the current difference and the historical difference.

2. The air conditioner according to claim 1, characterized in that, The controller is preset with a first correction coefficient and a second correction coefficient; The controller is also configured to: The sum of the differences equals the product of the first correction factor and the current difference plus the product of the second correction factor and the historical difference; If the sum of the differences is negative, the driving parameters are changed according to the sum of the differences, thereby changing the trend of the real-time parameters of the control item. If the sum of the differences is zero, the driver is controlled to maintain the original driving parameters and is prohibited from changing the driving parameters. If the sum of the differences is positive, the drive unit is controlled to operate in normal mode. The predictive control is not performed during normal operation.

3. The air conditioner according to claim 2, characterized in that, The controller is configured as follows: The first target value is the high point threshold; the current difference is equal to the first target value minus the real-time parameter; the historical difference is equal to the historical parameter minus the real-time parameter.

4. The air conditioner according to claim 2, characterized in that, The controller is configured as follows: The first target value is a low point threshold; the current difference is equal to the current real-time parameter minus the first target value; the historical difference is equal to the current real-time parameter minus the historical parameter.

5. The air conditioner according to claim 2 or 3, characterized in that, The controller has a preset acquisition period, which is the period for cyclically acquiring the real-time parameters; The historical parameter is the real-time parameter that is at least one acquisition cycle away from the current real-time parameter, and the number of acquisition cycles away from the current real-time parameter is determined according to the change trend of each of the saved real-time parameters.

6. The air conditioner according to any one of claims 2 to 4, characterized in that, The controller has a preset gain constant and is configured as follows: When the sum of the differences is negative, the controller controls the drive parameters to change the absolute value of the quotient of the sum of the differences divided by the gain constant.

7. The air conditioner according to any one of claims 2 to 4, characterized in that, The controller has a preset gain constant and is configured as follows: When the sum of the differences is negative, the controller controls the drive parameters to change the absolute value of the quotient of the sum of the differences divided by the gain constant.

8. The air conditioner according to claim 7, characterized in that, The fractional part of the sum of the differences divided by the gain constant is added to the sum of the differences in the next cycle.

9. The air conditioner according to claim 8, characterized in that, The controller is preset with a second target value, a third target value, a first hysteresis, a second hysteresis, and an adjustment value, and is configured as follows: When the real-time parameter reaches or exceeds the second target value, the driving parameter is controlled to change the absolute integer value of the adjustment value or the quotient of the difference and the gain constant. When the sum of the differences is positive, the real-time parameter is located between the first hysteresis value of the second target value and the third target value, and the drive unit is controlled to maintain the operation of its drive parameters and is prohibited from changing. When the real-time parameter is lower than the second hysteresis value of the third target value, the drive unit is controlled to operate in the normal mode. When the real-time parameter is between the second target value and the first hysteresis value of the second target value, or between the third target value and the second hysteresis value of the third target value, the drive unit is controlled to maintain its original operating state.

10. The air conditioner according to claim 9, characterized in that, The driving component is the compressor, which is connected to the controller and its operation is controlled by the controller. The controller has a preset fourth target value, the first target value is equal to the second target value, and is configured as follows: The real-time parameter is compared with the fourth target value; if the real-time parameter reaches or exceeds the fourth target value, the compressor is controlled to stop.

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