Compressor control method, temperature regulation system and temperature control equipment

Abstract

The present application provides a compressor control method, a temperature control system, and a temperature control device. The method includes: obtaining the operating power of the compressor, condensing fan, and evaporating fan at the current moment; calculating the total operating power of the temperature control system based on the operating power of the compressor, condensing fan, and evaporating fan; calculating the offset parameter of the total operating power at the current moment based on the total operating power of the temperature control system, the rated power threshold of the temperature control system, and the offset parameter at the previous moment; determining the target speed of the compressor based on the offset parameter of the total operating power and the expected speed of the compressor; generating a speed control instruction based on the target speed, and sending the speed control instruction to the compressor, the speed control instruction being used to instruct the compressor to operate at the target speed. The present application aims to improve the performance of the temperature control system under complex working conditions.

Description

Technical Field

[0001] The present application relates to the field of electrical control technology, and in particular to a compressor control method, a temperature adjustment system, and a temperature control device. Background Art

[0002] Temperature control devices are devices that provide external temperature regulation functions such as air circulation, cooling, and heating. Currently, temperature control devices often face complex and changing operating conditions, and their power consumption varies under different operating conditions. Under certain operating conditions, the temperature control system of a temperature control device may experience performance degradation, resulting in a failure to meet user requirements for energy consumption, battery life, and other performance requirements. Therefore, improving the performance of temperature control systems under complex operating conditions has become a pressing issue. Summary of the Invention

[0003] The main purpose of this application is to provide a compressor control method, a temperature regulation system and a temperature control device, aiming to improve the performance of the temperature regulation system under complex working conditions.

[0004] In a first aspect, the present application provides a compressor control method, which is applied to a temperature control system. The temperature control system includes a compressor, a condenser, and an evaporator, wherein the compressor is connected to the condenser and the evaporator; the temperature control system also includes a condensing fan and an evaporating fan, wherein the condensing fan is arranged on one side of the condenser, and the evaporating fan is arranged on one side of the evaporator; the method includes:

[0005] Obtaining the operating power of the compressor, condensing fan, and evaporating fan at the current moment;

[0006] Calculating the total operating power of the temperature control system based on the operating power of the compressor, the condensing fan, and the evaporating fan;

[0007] Calculating an offset parameter of the total operating power at a current moment according to the total operating power of the temperature control system, the rated power threshold of the temperature control system, and the offset parameter at a previous moment;

[0008] determining a target speed of the compressor according to the offset parameter of the total operating power and the desired speed of the compressor;

[0009] A speed control instruction is generated based on the target speed, and the speed control instruction is sent to the compressor, where the speed control instruction is used to instruct the compressor to operate according to the target speed.

[0010] In a second aspect, the present application further provides a temperature control system, comprising a compressor, a condenser, and an evaporator, wherein the compressor is connected to the condenser and the evaporator; the temperature control system further comprises a condensing fan and an evaporating fan, wherein the condensing fan is arranged on one side of the condenser, and the evaporating fan is arranged on one side of the evaporator;

[0011] The temperature adjustment system further includes a controller, which is used to implement the compressor control method described above.

[0012] In a third aspect, the present application further provides a temperature control device, which includes the temperature adjustment system as described above.

[0013] The present application provides a compressor control method, a temperature control system and a temperature control device. The present application obtains the operating power of the compressor, the condensing fan and the evaporating fan at the current moment; calculates the total operating power of the temperature control system according to the operating power of the compressor, the condensing fan and the evaporating fan; calculates the offset parameter of the total operating power at the current moment according to the total operating power of the temperature control system, the rated power threshold of the temperature control system and the offset parameter at the previous moment; determines the target speed of the compressor according to the offset parameter of the total operating power and the expected speed of the compressor; generates a speed control instruction based on the target speed, and sends the speed control instruction to the compressor, the speed control instruction is used to instruct the compressor to operate at the target speed. The present solution calculates the offset parameter of the total operating power at the current moment according to the total operating power, the rated power threshold and the offset parameter at the previous moment, and also adjusts the speed of the compressor according to the offset parameter of the total operating power and the expected speed of the compressor, thereby achieving closed-loop control of the total operating power of the temperature control system by adjusting the speed of the compressor in real time, which can avoid excessive power consumption of the temperature control system under complex working conditions, thereby more efficiently improving the performance of the temperature control system under complex working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0015] Figure 1 A diagram of an application scenario of the temperature control system provided in an embodiment of the present application;

[0016] Figure 2 A schematic flow chart of the steps of a compressor control method provided in an embodiment of the present application;

[0017] Figure 3 A schematic flow chart of another compressor control method provided in an embodiment of the present application;

[0018] Figure 4 A schematic diagram of the principles of Clarke transform and Parker transform provided in an embodiment of the present application;

[0019] Figure 5 A schematic diagram of a power control loop provided in an embodiment of the present application;

[0020] Figure 6 A schematic block diagram of a temperature control system provided in an embodiment of the present application;

[0021] Figure 7 A schematic block diagram of another temperature control system provided in an embodiment of the present application;

[0022] Figure 8 A schematic block diagram of a temperature control device provided in an embodiment of the present application.

[0023] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0024] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application; it is obvious that the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0025] The flowcharts shown in the accompanying drawings are for illustrative purposes only and do not necessarily include all contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps may be decomposed, combined, or partially merged, so the actual execution order may vary depending on the actual situation.

[0026] The following describes some embodiments of the present application in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features therein may be combined with each other.

[0027] Figure 1 This is an application scenario diagram of the temperature control system provided by the embodiment of this application. Figure 1As shown, the compressor control method can be applied to a temperature control system 10, which includes a compressor 11, a condenser 12, and an evaporator 13. Compressor 11 is connected to condenser 12 and evaporator 13. Temperature control system 10 also includes a condensing fan 14 and an evaporating fan 15. Condensing fan 14 is located on one side of condenser 12, and evaporating fan 15 is located on one side of evaporator 13.

[0028] It should be noted that the condensing fan 14 is used for cooling and ventilation on the side of the condenser 12, and the evaporating fan 15 is used for cooling and ventilation on the side of the evaporator 13. The compressor 11 can be connected to the condenser 12 via a throttle valve, and the condenser 12 can also be connected to the evaporator 13 via an expansion valve. The temperature control system 10 can be installed in a temperature control device, which can be an electrical device such as a household air conditioner, an outdoor air conditioner, a car refrigerator, a heat exchanger, etc.

[0029] For example, in the temperature control system 10, the compressor 11 compresses the working medium from a low-temperature, low-pressure gas into a high-temperature, high-pressure gas, which is then condensed into a medium-temperature, high-pressure liquid by the condenser 12. After being throttled by the throttle valve, it becomes a low-temperature, low-pressure liquid. The low-temperature, low-pressure liquid working medium is sent to the evaporator 13 through the expansion valve, absorbs heat and evaporates in the evaporator 13 to become a low-temperature, low-pressure steam, which is then sent to the compressor 11 again, thus completing the refrigeration cycle. Among them, the condensing fan 14 is responsible for cooling and ventilation on one side of the condenser 12 during the operation of the condenser 12. The evaporating fan 15 is responsible for cooling and ventilation on one side of the evaporator 13 during the operation of the evaporator 13.

[0030] Please refer to Figure 2 , Figure 2 A flow chart of steps of a compressor control method provided in an embodiment of the present application is provided, wherein the compressor control method includes:

[0031] S101, obtaining the current operating power of the compressor, condensing fan, and evaporating fan.

[0032] In this step, in order to complete the cooling and heating control of the temperature control system, before performing frequency conversion control on the compressor, condensing fan and evaporating fan, it is necessary to accurately obtain the operating power of the compressor, condensing fan and evaporating fan.

[0033] In this step, the operating powers of the compressor, condensing fan, and evaporating fan may be obtained at each control moment. The operating powers of the compressor, condensing fan, and evaporating fan may be obtained at the same moment, and the operating powers of the compressor, condensing fan, and evaporating fan may vary at different moments.

[0034] In this step, the operating powers of the compressor, condensing fan, and evaporating fan can be directly obtained or calculated. For example, the operating powers of the compressor, condensing fan, and evaporating fan can be directly read using a power meter. Alternatively, the operating frequencies of the compressor, condensing fan, and evaporating fan can be first obtained and the operating powers corresponding to the respective operating frequencies can be determined as the operating powers of the compressor, condensing fan, and evaporating fan by looking up a table.

[0035] In this step, the operating power of the compressor, condensing fan, and evaporating fan can be obtained in different ways. For example, the operating power of the compressor can be obtained by sampling the current of the compressor's three-phase circuit and performing an approximate calculation. The operating power of the condensing fan and evaporating fan can be obtained by obtaining the operating frequency of the condensing fan and evaporating fan and determining the operating power corresponding to the operating frequency of the condensing fan and evaporating fan by looking up the table.

[0036] S102: Calculate the total operating power of the temperature control system according to the operating powers of the compressor, the condensing fan, and the evaporating fan.

[0037] In this step, the total operating power of the temperature control system is calculated based on the operating power of the compressor, the condensing fan, and the evaporating fan. For example, the total operating power of the temperature control system can be the sum of the operating power of the compressor, the condensing fan, and the evaporating fan.

[0038] For example, the operating powers of the compressor, condensing fan, and evaporating fan are respectively compressor power, condensing fan power, and evaporating fan power. The total operating power POWER of the temperature control system = compressor power + condensing fan power + evaporating fan power.

[0039] In this step, the total operating power of the temperature control system can also be calculated based on the sum of the operating power of the compressor, the condensing fan, and the evaporating fan and a preset adjustment coefficient. The embodiment of the present application does not specifically limit the calculation method of the total operating power of the temperature control system.

[0040] Exemplarily, the sum of the operating powers of the compressor, the condensing fan, and the evaporating fan is calculated; and the product of the sum of the operating powers and the preset adjustment coefficient is calculated to obtain the total operating power of the temperature control system.

[0041] S103 , calculating an offset parameter of the total operating power at the current moment according to the total operating power of the temperature control system, the rated power threshold of the temperature control system, and the offset parameter at the previous moment.

[0042] In this step, the rated power threshold of the temperature control system refers to the power of the temperature control system when it is working normally. The rated power threshold can be set according to the actual situation of the temperature control system. For example, the rated power threshold is 700W.

[0043] In this step, the offset parameter POWER_OUT is used to perform closed-loop regulation of the total operating power, bringing the adjusted total operating power closer to the rated power threshold. The offset parameter at the previous moment refers to the offset parameter used to adjust the total operating power at the previous moment. The offset parameter at the first moment can be zero or a preset constant, which is not specifically limited in this embodiment.

[0044] Among them, the offset parameter POWER_OUT can be obtained by deviation adjustment based on the deviation value between the rated power threshold and the total operating power of the temperature control system. The deviation adjustment method is, for example, PID (Proportion Integral Differential) algorithm adjustment, PI (Proportion Integral) algorithm adjustment, fuzzy control algorithm adjustment, etc.

[0045] During the operation of the temperature control system, it will face some complex working conditions, which will result in greater power consumption. For example, when the temperature control system is in a high-temperature environment, the working environment of the gas inside the compressor is relatively complex, and the internal cavity pressure is relatively high. Under the same control frequency, as the ambient temperature rises and the compressor body heats up, the power will gradually increase. Therefore, under complex working conditions, the total operating power of the temperature control system is usually greater than the rated power threshold of the temperature control system. In addition, the power supply of the temperature control system cannot meet the continuously increasing power demand of the compressor. When the maximum power is exceeded, power-off protection will occur.

[0046] In this step, the offset parameter for the total operating power at the current moment is determined based on the current total operating power of the temperature control system, the rated power threshold of the temperature control system, and the offset parameter at the previous moment, thereby achieving closed-loop power control of the temperature control system. During the closed-loop control process of the temperature control system, the total operating power at different moments will change as the offset parameter is adjusted. As the adjustment of the offset parameter continues, the difference between the total operating power and the rated power threshold will become smaller and more stable, thereby ensuring stable operation of the temperature control system and preventing abnormal situations such as system power outages caused by excessive power.

[0047] Exemplarily, the deviation value between the total operating power of the temperature control system and the rated power threshold is calculated; if the deviation value between the total operating power and the rated power threshold at the current moment and the offset parameter at the previous moment are both negative values, then based on the total operating power and the rated power threshold, the offset parameter of the total operating power is calculated; when the deviation value between the total operating power and the rated power threshold at the current moment is positive, regardless of whether the offset parameter at the previous moment is negative or positive, the offset parameter of the total operating power can be calculated based on the total operating power and the rated power threshold; when the deviation value between the total operating power and the rated power threshold at the current moment is negative, and the offset parameter at the previous moment is positive, the offset parameter of the total operating power is determined to be a preset value, which can be zero or a value approximately equal to zero. At this time, the total operating power of the temperature control system is regulated to near the rated power threshold.

[0048] S104: Determine a target speed of the compressor according to the offset parameter of the total operating power and the desired speed of the compressor.

[0049] In this step, the total operating power offset parameter is also used to adjust the compressor speed, thereby achieving closed-loop regulation of the total operating power. In this step, the desired compressor speed refers to the desired operating speed of the compressor, which can be the speed at which the compressor is expected to operate normally. The desired compressor speed can be set based on the actual conditions of the compressor, for example, 2000 RPM.

[0050] In this step, the compressor speed is positively correlated with the total operating power of the temperature control system. When the compressor speed decreases, the total operating power of the temperature control system decreases as the speed decreases. When the compressor speed increases, the total operating power of the temperature control system increases as the speed increases. Thus, the total operating power of the temperature control system can be adjusted by adjusting the compressor speed.

[0051] In this step, the target speed of the compressor can be determined based on the sum of the offset parameter of the total operating power and the expected speed of the compressor. Of course, it can also be determined based on a preset speed calculation formula. For example, the offset parameter of the total operating power and the expected speed of the compressor are input into the preset speed calculation formula, and the calculated value obtained is the target speed of the compressor. The embodiment of the present application does not make specific limitations on this.

[0052] S105 , generating a speed control instruction based on the target speed, and sending the speed control instruction to the compressor, where the speed control instruction is used to instruct the compressor to operate at the target speed.

[0053] In this step, a speed control instruction is generated based on the target speed, and the speed control instruction is sent to the compressor, thereby instructing the compressor to operate at the target speed, thereby achieving adjustment of the compressor speed and further adjustment of the total operating power.

[0054] In this step, the speed control instruction can be sent to the compressor at multiple times, and the target speeds in the speed control instructions sent at different times can be different, thereby realizing closed-loop control of the total operating power of the temperature control system. The change in the target speed corresponding to adjacent moments can become smaller and smaller and tend to zero, which can ensure that the power consumption of the temperature control system under complex working conditions remains stable, thereby more efficiently improving the performance of the temperature control system under complex working conditions.

[0055] The compressor control method provided in the above embodiment calculates the offset parameter of the total operating power at the current moment through the total operating power at the current moment, the rated power threshold and the offset parameter at the previous moment, and also adjusts the speed of the compressor according to the offset parameter of the total operating power and the expected speed of the compressor. Therefore, by adjusting the speed of the compressor in real time, closed-loop control of the total operating power of the temperature control system is achieved, which can avoid the performance degradation of the temperature control system due to excessive power consumption under complex working conditions, thereby more efficiently improving the performance of the temperature control system under complex working conditions.

[0056] Please refer to Figure 3 , Figure 3 A schematic flow chart of the steps of another compressor control method provided in an embodiment of the present application.

[0057] like Figure 3 As shown, the compressor control method includes steps S201 to S207.

[0058] Step S201: Obtain the current operating power of the compressor, condensing fan, and evaporating fan.

[0059] In one embodiment, obtaining the operating power of the compressor includes: obtaining three-phase current of a three-phase circuit in the compressor; performing Clarke transformation on the three-phase current to obtain candidate current parameters; performing Park transformation on the candidate current parameters to obtain target current parameters; inputting the target current parameters into a PI (Proportion Integral) controller for calculation to obtain a target voltage parameter of the compressor; and calculating the product of the target current parameter and the target voltage parameter to obtain the operating power of the compressor.

[0060] It should be noted that the three-phase current of the three-phase circuit can be the three-phase current of the three-phase circuit at the current moment obtained by the current sampling circuit. By performing calculation methods such as Clarke transform and Park transform on the three-phase current in the compressor, the operating power of the compressor at the current moment can be calculated quickly and accurately.

[0061] Exemplarily, the temperature control system further includes a current sampling circuit, which is connected to the three-phase sampling points of the three-phase circuit. The current sampling circuit may include three sampling resistors, each sampling resistor is connected to a phase sampling point of the three-phase circuit, and the three-phase currents ia, ib, and ic of the three-phase circuit can be sampled in real time through the current sampling circuit. Figure 4 As shown in the figure, by performing a CLARK transformation on the three-phase currents ia, ib, and ic, candidate current parameters Ialpha and Ibeta are obtained. The candidate current parameters Ialpha and Ibeta are then subjected to a PARK transformation to obtain the target current parameter Iq. The target current parameter Iq is calculated by the temperature control system's PI controller, which outputs the compressor's target voltage parameter Uq. At this point, the compressor power can be approximated by multiplying the target current parameter Iq by the target voltage parameter Uq, resulting in the current compressor operating power = Uq * Iq.

[0062] In one embodiment, obtaining the operating power of the condensing fan includes: obtaining the current operating frequency of the condensing fan; searching for the operating power corresponding to the current operating frequency in a first fan power table as the operating power of the condensing fan, wherein the first fan power table records the correspondence between the operating power of the condensing fan and the operating frequency of the condensing fan.

[0063] It should be noted that the first fan power table can be generated by statistically analyzing the operating power of the condensing fan at multiple operating frequencies of the condensing fan. Different operating frequencies represent different speeds of the condensing fan. By searching the first fan power table for the operating power corresponding to the current operating frequency of the condensing fan, the current operating power of the condensing fan can be quickly and accurately obtained.

[0064] In one embodiment, the operating power of the evaporator fan is obtained, including specific implementations similar to those described for obtaining the operating power of the condenser fan. For example, the current operating frequency of the evaporator fan is obtained, and the operating power corresponding to the current operating frequency is searched in a second fan power table, where the second fan power table records the corresponding relationship between the operating power of the evaporator fan and the operating frequency of the evaporator fan.

[0065] It should be noted that the current operating frequency of the evaporator fan may be different from the current operating frequency of the condenser fan, and the correspondence between the operating power and operating frequency of the evaporator fan and the condenser fan may be inconsistent. Therefore, the recorded content of the second fan power table may be different from the recorded content of the first fan power table. It is understood that the specific method for obtaining the operating power of the evaporator fan can refer to the corresponding example for obtaining the operating power of the condenser fan, and this embodiment will not be repeated here.

[0066] For example, a DC source can be used to pre-calculate the operating power of the condensing fan and the evaporating fan at different operating frequencies, and the corresponding first and second fan power tables can be generated. The first fan power table describes the corresponding relationship between the operating frequency and operating power of the condensing fan, while the second fan power table describes the corresponding relationship between the operating frequency and power of the evaporating fan. The records in the first and second fan power tables are independent of the rotational speeds of the condensing and evaporating fans.

[0067] Step S202: Calculate the total operating power of the temperature control system according to the operating power of the compressor, the condensing fan, and the evaporating fan.

[0068] The total operating power of the temperature adjustment system may be calculated based on the sum of the operating powers of the compressor, the condensing fan, and the evaporating fan.

[0069] For example, the compressor's operating power P1 is calculated by performing Clarke and Park transforms on the three-phase current in the compressor's three-phase circuit. The condensing fan's operating power P2 is obtained by looking up the first fan power table. The evaporating fan's operating power P3 is obtained by looking up the second fan power table. The total operating power POWER of the temperature control system = compressor operating power P1 + condensing fan operating power P2 + evaporating fan operating power P3.

[0070] Step S203: Determine whether the total operating power is greater than the rated power threshold.

[0071] The rated power threshold refers to the power of the temperature control system when it is working normally. The rated power threshold can be set according to the actual situation of the temperature control system. For example, the rated power threshold is 700W.

[0072] Exemplarily, after the total operating power POWER of the temperature control system is calculated, the total operating power POWER is compared with a preset rated power threshold to determine whether the total operating power is greater than the rated power threshold.

[0073] Step S204: When the total operating power is greater than the rated power threshold, an offset parameter of the total operating power is calculated based on the total operating power and the rated power threshold.

[0074] When the total operating power exceeds the rated power threshold, it indicates that the temperature control system may be operating under complex conditions, and the current operating power of the temperature control system is higher than the rated power during normal operation. Therefore, a total operating power offset parameter can be calculated based on the total operating power and the rated power threshold. This offset parameter is used to adjust the compressor speed, thereby achieving closed-loop regulation of the total operating power and ensuring stable power consumption of the temperature control system under complex conditions.

[0075] In one embodiment, a deviation value between a rated power threshold and the total operating power is calculated; a deviation adjustment is performed based on the deviation value to obtain an offset parameter for the total operating power. It should be noted that the deviation value is the difference between the total operating power and the rated power threshold. When the total operating power is greater than the rated power threshold, the deviation value is negative. The greater the absolute value of the deviation value, the greater the calculated offset parameter. By performing deviation adjustment based on this deviation value, the offset parameter for the total operating power can be accurately determined, thereby enabling real-time adjustment of the compressor speed based on the offset parameter.

[0076] For example, the total operating power POWER is 720W and the rated power threshold is 700W, that is, the total operating power POWER>700. In this case, the deviation value difference is the difference between the rated power threshold and the total operating power POWER: POWER_ERR = 700 - 720 = -20.

[0077] Exemplarily, the deviation value is adjusted by the PID algorithm to obtain the offset parameter of the total operating power. Specifically, a preset proportional coefficient, a preset integral coefficient, and a preset differential coefficient are obtained; a first offset parameter of the total operating power is determined based on the preset proportional coefficient and the deviation value; a deviation cumulative value is calculated based on the deviation values ​​obtained by multiple calculations, and a second offset parameter of the total operating power is determined based on the preset integral coefficient and the deviation cumulative value; a deviation difference is determined based on the deviation value calculated at the current moment and the deviation value calculated at the previous moment, and a third offset parameter of the total operating power is determined based on the preset integral coefficient and the deviation difference; and the sum of the first offset parameter, the second offset parameter, and the third offset parameter is calculated to obtain the offset parameter of the total operating power.

[0078] For example, the PID algorithm formula is: .in, represents the offset parameter, Indicates the preset scale factor, Indicates the preset integral coefficient, represents the preset differential coefficient, Indicates the deviation between the total operating power and the rated power threshold. Indicates the accumulated deviation value. Indicates the deviation difference.

[0079] It should be noted that the preset proportional coefficient, the preset integral coefficient and the preset differential coefficient are control parameters of the PID algorithm and can be flexibly set according to actual conditions. For example, the preset proportional coefficient K is set to p = 1, preset integral coefficient K I =0.01, preset differential coefficient K D = 0. In actual application, the above correlation coefficient can be modified according to actual needs.

[0080] In some embodiments, after obtaining the total operating power offset parameter, the offset parameter can be fine-tuned, such as by rounding, to facilitate subsequent calculations. Furthermore, the value range of the total operating power offset parameter can be set, for example, limiting the output of the offset parameter POWER_OUT to [-1, -2500].

[0081] Step S205 : When the total operating power is less than or equal to the rated power threshold, if the offset parameter at the previous moment is a negative value, the offset parameter of the total operating power is calculated based on the total operating power and the rated power threshold.

[0082] It should be noted that the offset parameter of the total operating power at the current moment is calculated based on the total operating power of the temperature control system, the rated power threshold of the temperature control system, and the offset parameter at the previous moment. When the offset parameter at the previous moment is a negative value, for example, the offset parameter at the previous moment is -100, the integral term of the offset parameter at the previous moment will be accumulated when calculating the offset parameter at the current moment, resulting in a discontinuous offset parameter at the current moment. This will subsequently cause frequent adjustments to the compressor speed, which can easily cause the temperature control system to crash.

[0083] Therefore, when the total operating power is less than or equal to the rated power threshold, the previous offset parameter being a negative value is used as the second condition. If the previous offset parameter is negative, the total operating power offset parameter is calculated based on the total operating power and the rated power threshold, re-entering power closed-loop control. This eliminates the influence of the integral term of the historical offset parameter on the current compressor speed control.

[0084] Exemplarily, calculating the total operating power offset parameter based on the total operating power and the rated power threshold includes: calculating a deviation between the total operating power of the temperature control system and the rated power threshold; and performing a deviation adjustment based on the deviation to obtain the total operating power offset parameter. The specific implementation process of this example can be found in the corresponding processes of steps S103 and S204, and will not be further described in this embodiment.

[0085] In one embodiment, the compressor control method further includes: when the total operating power is less than or equal to the rated power threshold, if the offset parameter at the previous moment is a positive value, determining the offset parameter of the total operating power at the current moment to be zero.

[0086] It should be noted that if the offset parameter at the previous moment is a positive value, the integral term of the offset parameter at the previous moment will not affect the calculation of the offset parameter at the current moment, and the premise of this judgment condition is that the total operating power is less than or equal to the rated power threshold, indicating that the total operating power at the current moment is adjusted to the power range during normal operation, so there will be no phenomenon of performance degradation due to excessive power consumption. Therefore, the offset parameter of the total operating power at the current moment can be determined to be zero, thereby ending the power closed-loop control.

[0087] Step S206: Determine the target speed of the compressor according to the offset parameter of the total operating power and the expected speed of the compressor.

[0088] Among them, the target speed of the compressor can be proportional to the offset parameter of the total operating power, that is, the smaller the offset parameter, the smaller the target speed ω_ref of the compressor, and the lower the amplitude of controlling the speed of the compressor, until the total operating power of the temperature control system is controlled to a rated power threshold, such as around 700W, and the speed and operating frequency of the compressor remain stable.

[0089] In one embodiment, the target speed of the compressor is obtained by calculating the sum of an offset parameter of the total operating power and a desired speed of the compressor, wherein the offset parameter is a negative value, the offset parameter is positively correlated with the target speed, and the absolute value of the offset parameter is inversely correlated with the target speed.

[0090] For example, the offset parameter PWER_OUT output by the PI controller at the current moment is -100, and the desired speed spd_ref of the compressor is 2100 RPM. The target speed of the compressor ω_ref = PWER_OUT + spd_ref = 2100 + (-100) = 2000 RPM.

[0091] Step S207: Generate a speed control instruction based on the target speed, and send the speed control instruction to the compressor. The speed control instruction is used to instruct the compressor to operate at the target speed.

[0092] The speed control instruction may include the target speed. After the speed control instruction is sent to the compressor, the compressor may operate according to the target speed in the speed control instruction. It should be noted that the speed of the compressor is controlled by the speed control instruction, and the speed control instruction may be sent to the compressor continuously at multiple times, thereby achieving closed-loop control of the operating power of the temperature control system. The change in the target speed can become smaller and smaller and approach zero, ensuring that the power consumption of the temperature control system remains stable under complex operating conditions, and more efficiently improving the performance of the temperature control system.

[0093] For example, if the target speed is 2000 RPM, a speed control command carrying this target speed is sent to the compressor, and the compressor's operating speed is updated to 2000 RPM. As the compressor speed decreases, the total operating power of the temperature control system decreases as the compressor speed decreases, thereby adjusting the total operating power of the temperature control system.

[0094] In one embodiment, if it is determined based on the target speed ω_ref of the compressor that the total operating power POWER of the temperature control system is still greater than the rated power threshold, a new offset parameter POWER_OUT is continuously output through the PI controller, and a new target speed ω_ref is determined based on the new offset parameter POWER_OUT and the desired speed spd_ref of the compressor, and a new speed control instruction is output to the compressor based on the new target speed ω_ref, so as to control the compressor to operate according to the new target speed ω_ref, so that the speed of the compressor becomes closer and closer to the desired speed, thereby improving the working performance of the temperature control system.

[0095] For example, the ambient temperature is 45 degrees Celsius, and the user sets the temperature control system to Cooling MAX mode. At this time, the maximum compressor speed is 2100 RPM, the initial speed is 1800 RPM, the evaporator fan PWM is 70%, and the condenser fan maximum PWM is 70%. According to the compressor control method, after the user turns on the system, the system is in Cooling MAX operating mode. At this time, the evaporator fan throttle control amount is 1500 PWM, and the power table shows 30W. The condenser fan throttle control amount is dynamically adjusted within the range of 30%-70% based on the current condenser tube temperature. The operating power is obtained by looking up the table and ranges from 9W to 57W. When the compressor starts working, the frequency is 60HZ (1800RPM), and then the compressor speed will gradually increase to the desired speed of 2100RPM, and the operating power will increase accordingly. After the compressor starts working, as time goes by and the compressor body temperature rises, the ambient temperature rises, and the internal gas pressure increases, the operating power will increase accordingly, and will gradually approach the critical protection power. The rated power threshold is set to 700W, indicating that the operating power of the temperature control system is expected to be limited to 700W. When the total operating power of the temperature control system exceeds the rated power threshold of 700W, the power closed loop of the compressor control method begins to operate. The output of the power closed loop reduces the desired compressor frequency, thereby reducing power demand and placing the temperature control system in a power-limited operating state. This ensures stable cooling operation of the system, reduces power consumption of the temperature control system, and more efficiently improves the temperature control system's performance.

[0096] The compressor control method provided in the above embodiment calculates the offset parameter of the total operating power based on the total operating power and the rated power threshold when the total operating power of the temperature control system is greater than the rated power threshold, and adjusts the speed of the compressor according to the offset parameter of the total operating power and the expected speed of the compressor. Therefore, by adjusting the speed of the compressor in real time, closed-loop control of the total operating power of the temperature control system is achieved, which can avoid the performance degradation of the temperature control system due to excessive power consumption under complex working conditions, thereby more efficiently improving the working performance under complex working conditions.

[0097] The compressor control method provided in the above embodiment, when the total operating power of the temperature control system is less than or equal to the rated power threshold, if the offset parameter at the previous moment is a negative value, then the offset parameter of the total operating power is calculated based on the total operating power and the rated power threshold, and the speed of the compressor is adjusted according to the offset parameter of the total operating power and the expected speed of the compressor, thereby eliminating the influence of the integral term of the historical offset parameter on the speed control of the compressor at the current moment, and will not affect the subsequent speed control of the compressor, thereby more efficiently improving the performance of the temperature control system under complex working conditions.

[0098] For example, Figure 5 As shown, Figure 5 This is a schematic diagram of a power control loop provided in an embodiment of the present application, which aims to achieve closed-loop regulation of total operating power by adjusting the speed of the compressor. The specific implementation steps of the power control loop are as follows:

[0099] Step 1: Obtain the total operating power POWER of the temperature control system. Total operating power POWER = compressor operating power + condensing fan operating power + evaporating fan operating power.

[0100] The compressor's operating power is determined based on real-time sampling data from the compressor's three-phase circuit. The operating power of the condensing fan and the evaporating fan can be determined by looking up the operating power at different frequencies through an electronically controlled table. In a specific implementation, a DC source can be used to pre-calculate the operating power of the condensing fan and evaporating fan at different frequencies, and the corresponding power table can be compiled. This power table describes the corresponding relationship between the operating frequency and operating power of the condensing fan, and the corresponding relationship between the operating frequency and power of the evaporating fan.

[0101] Step 2: Feed the calculated total operating power POWER back to Figure 5 In the closed-loop power control shown, whether a preset PI adjustment condition is met is determined based on the total operating power POWER and the offset parameter POWER_OUT at the previous moment.

[0102] Figure 5 In the judgment box, "||" indicates that condition 1 (POWER > POWER_ref) and condition 2 (POWER_OUT < 0) are evaluated in sequence. Furthermore, if condition 1 is true, condition 2 is no longer evaluated, resulting in a true overall judgment. Only when both condition 1 and condition 2 are false is the overall judgment false.

[0103] If the total operating power (POWER) is greater than the rated power threshold (POWER_ref) (e.g., 700W), or the control variable (POWER_OUT) from the previous cycle is less than 0, the preset PI adjustment condition is determined to be met. For example, if the air conditioner is operating in Cooling MAX mode, the desired compressor speed (spd_ref) is 2100 RPM. When the operating mode is determined, the desired compressor speed (spd_ref) is constant.

[0104] In the first regulation cycle, the offset parameter POWER_OUT at the previous moment is 0, and the calculated total operating power POWER is 720W. This means that the total operating power POWER exceeds the rated power threshold POWER_ref (for example, 700W). At this point, the power error POWER_ERR = 700 - POWER = -20. This confirms that condition 1 for the preset PI regulation is met, and step 3 is executed.

[0105] Step 3: Output the current offset parameter POWER_OUT through the PI controller ( Figure 5 After the PI controller in the middle).

[0106] Power error POWER_ERR = 700 – POWER is a negative value. A larger power error POWER_ERR results in a more negative offset parameter POWER_OUT output by the PI controller, which increases the adjustment of the compressor's target speed ω_ref. The output of the offset parameter POWER_OUT is limited to [-1, -2500].

[0107] After calculation, the PI controller outputs the current offset parameter, POWER_OUT, as a negative number. This POWER_OUT is the virtual control variable at the current moment, used to adjust the desired speed value, spd_ref, in the current operating mode. Here, the current POWER_OUT is not based on the POWER_OUT of the previous cycle. Instead, the PI controller determines it based on the current offset parameter, 720W.

[0108] Step 4: Output the target speed ω_ref of the compressor according to the offset parameter POWER_OUT at the current moment and the desired speed Spd_ref of the compressor.

[0109] Where ω_ref is the speed estimated by the estimator. PWER_OUT is a negative value. A larger value results in a smaller ω_ref value, and the compressor speed decreases accordingly. The compressor frequency stabilizes when the total operating power of the temperature control system is controlled to approximately 700W.

[0110] Assuming that the PI controller outputs PWER_OUT at -100 during the first cycle, the compressor speed feedback value ω_ref is calculated as PWER_OUT + spd_ref = 2100 + (-100) = 2000 RPM. After the power control loop is adjusted, the compressor speed is updated to 2000 RPM. As the compressor speed decreases, the total operating power decreases as the speed decreases, thereby adjusting the total operating power of the temperature control system.

[0111] Step 5: If it is determined based on the compressor target speed ω_ref that the total operating power POWER of the second cycle is still greater than the rated power threshold POWER_ref, that is, the condition of >700W is still met, a new POWER_OUT is continued to be output through the PI controller, and a new ω_ref is output based on the new POWER_OUT and spd_ref.

[0112] In the second regulation cycle, since the power feedback POWER_OUT in the first cycle was -100, the calculated power feedback POWER is now 710W. In other words, POWER > 700. The power error is the difference between the desired power and the feedback power: POWER_ERR = 710 - POWER = -10. This confirms that the preset PI regulation conditions are met, and proceeds to step 3.

[0113] Step 6, parallel to step 5: If the total operating power POWER of the second cycle is determined to be less than the rated power threshold POWER_ref based on the compressor target speed ω_ref, then the first power regulation > 700W condition is exited and the power control loop is not entered.

[0114] Since the integral term output of the POWER_OUT of the first cycle of the PI controller still exists at this time, for example, POWER_OUT = -100, the previous control output will be accumulated when the power control loop is next entered, resulting in discontinuous POWER_OUT output of the power control loop. This will cause the target speed to be adjusted frequently, which can easily cause the temperature control system to crash. Therefore, it is necessary to set the historical output to be less than 0 as the second condition before entering the power control loop to eliminate the influence of the historical integral on the next control.

[0115] Similar to step 6, after step 5, if the total operating power POWER of the third cycle is less than the rated power threshold POWER_ref, the first condition, ie, POWER>POWER_ref, is exited, and the power control loop is not entered.

[0116] See also Figure 6 , Figure 6 A schematic block diagram of a temperature control system provided in an embodiment of the present application.

[0117] like Figure 6As shown, the temperature control system 300 includes a compressor 310, a condenser 320, and an evaporator 330. The compressor 310 is connected to the condenser 320 and the evaporator 330. The temperature control system 300 also includes a condensing fan 340 and an evaporating fan 350. The condensing fan 340 is arranged on one side of the condenser 320, and the evaporating fan 350 is arranged on the other side of the evaporator 330. The temperature control system 100 also includes a controller 360. The controller 360 is connected to the compressor 310 and is used to implement the compressor control method of any embodiment of the present application. For example, the controller 360 is used to send a speed control instruction to the compressor 310.

[0118] In some embodiments, the controller 360 may also be connected to the condenser 320 and the evaporator 330 and used to control the condenser 320 and the evaporator 330 , which is not specifically limited in this embodiment.

[0119] For example, Figure 7 As shown, the temperature control system 300 also includes a four-way valve 370 and an electronic expansion valve 380. The compressor 310 is connected to the condenser 320 and the evaporator 330 via the four-way valve 370. The electronic expansion valve 380 is connected between the condenser 320 and the evaporator 330. The controller 360 is also used to perform variable frequency control on the compressor 310, the condensing fan 340, and the evaporating fan 350. The controller 360 is also used to control the opening of the four-way valve 370 and the electronic expansion valve 380, thereby achieving corresponding cooling and heating control.

[0120] Those skilled in the art will understand that Figure 6 and Figure 7 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the temperature control system 300 to which the solution of the present application is applied. The specific temperature control system 300 may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0121] In one embodiment, the controller 360 is configured to execute a computer program stored in the memory to implement the following steps:

[0122] Obtaining the operating power of the compressor, condensing fan, and evaporating fan at the current moment;

[0123] Calculating the total operating power of the temperature control system based on the operating power of the compressor, the condensing fan, and the evaporating fan;

[0124] Calculating an offset parameter of the total operating power at a current moment according to the total operating power of the temperature control system, the rated power threshold of the temperature control system, and the offset parameter at a previous moment;

[0125] determining a target speed of the compressor according to the offset parameter of the total operating power and the desired speed of the compressor;

[0126] A speed control instruction is generated based on the target speed, and the speed control instruction is sent to the compressor, where the speed control instruction is used to instruct the compressor to operate according to the target speed.

[0127] It should be noted that those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the temperature control system 300 described above can refer to the corresponding process in the aforementioned compressor control method embodiment, which will not be repeated here.

[0128] See also Figure 8 , Figure 8 A schematic block diagram of the structure of a temperature control device provided in an embodiment of the present application.

[0129] like Figure 8 As shown, the temperature control device 400 includes a temperature adjustment system 410 .

[0130] The temperature control device 400 may be an electrical appliance such as a household air conditioner, outdoor air conditioner, washing machine, water heater, or lawn mower. The temperature adjustment system 410 may include the temperature adjustment system 300 of the aforementioned embodiment. The temperature control device 400 may also include circuit units such as a main control circuit, an inverter circuit, a rectifier circuit, a voltage conversion circuit, a voltage stabilization circuit, and a power supply circuit.

[0131] Exemplarily, the temperature control system includes a compressor, a condenser, and an evaporator, as well as a four-way valve and an electronic expansion valve. The compressor is connected to the condenser and evaporator via the four-way valve, and the electronic expansion valve is connected between the condenser and evaporator. The temperature control system also includes a condensing fan and an evaporating fan. The condensing fan is located on one side of the condenser, and the evaporating fan is located on the other side of the evaporator.

[0132] It should be noted that, those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the temperature control device 400 described above can refer to the corresponding process in the aforementioned compressor control method embodiment, and will not be repeated here.

[0133] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A compressor control method, characterized in that: Applied to a temperature control system, the temperature control system includes a compressor, a condenser, and an evaporator, the compressor being connected to the condenser and the evaporator; the temperature control system also includes a condensing fan and an evaporating fan, the condensing fan being arranged on one side of the condenser, and the evaporating fan being arranged on one side of the evaporator; the method includes: Obtaining the operating power of the compressor, condensing fan, and evaporating fan at the current moment; Calculating the total operating power of the temperature control system based on the operating power of the compressor, the condensing fan, and the evaporating fan; Calculating an offset parameter of the total operating power at a current moment according to the total operating power of the temperature control system, the rated power threshold of the temperature control system, and the offset parameter at a previous moment; determining a target speed of the compressor according to the offset parameter of the total operating power and the desired speed of the compressor; generating a speed control instruction based on the target speed, and sending the speed control instruction to the compressor, wherein the speed control instruction is used to instruct the compressor to operate at the target speed; Calculating the offset parameter of the total operating power at the current moment according to the total operating power of the temperature control system, the rated power threshold of the temperature control system, and the offset parameter at the previous moment includes: Determining whether the total operating power is greater than the rated power threshold; When the total operating power is greater than the rated power threshold, calculating an offset parameter of the total operating power based on the total operating power and the rated power threshold; When the total operating power is less than or equal to the rated power threshold, if the offset parameter at the previous moment is a negative value, the offset parameter of the total operating power is calculated based on the total operating power and the rated power threshold.

2. The compressor control method according to claim 1, characterized in that: The calculating, based on the total operating power and the rated power threshold, an offset parameter of the total operating power includes: Calculating a deviation between the rated power threshold and the total operating power; Deviation adjustment is performed according to the deviation value to obtain an offset parameter of the total operating power.

3. The compressor control method according to claim 2, characterized in that: The performing deviation adjustment according to the deviation value to obtain the offset parameter of the total operating power includes: Obtaining a preset proportional coefficient, a preset integral coefficient, and a preset differential coefficient; determining a first offset parameter of the total operating power according to the preset proportional coefficient and the deviation value; Calculating a deviation cumulative value based on the deviation values ​​obtained by multiple calculations, and determining a second offset parameter of the total operating power based on the preset integral coefficient and the deviation cumulative value; determining a deviation difference according to the deviation value calculated at the current moment and the deviation value calculated at the previous moment, and determining a third offset parameter of the total operating power according to the preset integral coefficient and the deviation difference; The sum of the first offset parameter, the second offset parameter, and the third offset parameter is calculated to obtain the offset parameter of the total operating power.

4. The compressor control method according to claim 1, wherein: The compressor control method further includes: When the total operating power is less than or equal to the rated power threshold, if the offset parameter at the previous moment is a positive value, the offset parameter of the total operating power at the current moment is determined to be zero.

5. The compressor control method according to claim 1, wherein: Determining the target speed of the compressor according to the offset parameter of the total operating power and the desired speed of the compressor includes: The sum of the offset parameter of the total operating power and the desired speed of the compressor is calculated to obtain the target speed of the compressor.

6. The compressor control method according to any one of claims 1 to 5, characterized in that: Obtaining the operating power of the compressor, comprising: obtaining three-phase currents of a three-phase circuit in the compressor; performing Clarke transform on the three-phase current to obtain candidate current parameters; Performing a Parker transform on the candidate current parameters to obtain target current parameters; Inputting the target current parameter into a PI controller for calculation to obtain a target voltage parameter of the compressor; The product of the target current parameter and the target voltage parameter is calculated to obtain the operating power of the compressor.

7. The compressor control method according to any one of claims 1 to 5, characterized in that: Obtaining the operating power of the condensing fan includes: Obtaining the current operating frequency of the condensing fan; The operating power corresponding to the current operating frequency is searched in the first fan power table as the operating power of the condensing fan, wherein the first fan power table records the correspondence between the operating power of the condensing fan and the operating frequency of the condensing fan.

8. A temperature control system, characterized in that: The temperature control system includes a compressor, a condenser and an evaporator, wherein the compressor is connected to the condenser and the evaporator; the temperature control system also includes a condensing fan and an evaporating fan, wherein the condensing fan is arranged on one side of the condenser and the evaporating fan is arranged on one side of the evaporator; The temperature adjustment system further includes a controller connected to the compressor, wherein the controller is configured to implement the compressor control method according to any one of claims 1 to 6.

9. A temperature control device, characterized in that: The temperature control device includes the temperature adjustment system according to claim 8.

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