A method and system for controlling a refrigeration system

Abstract

The present application relates to the field of refrigeration conditioning technology, and more particularly to a refrigeration system control method and system, the method according to the set temperature of the refrigeration system, call the corresponding parameter table, and then query the indoor coil temperature in the parameter table in multiple row numbers, then in response to the current running time is less than the predetermined running time, the indoor humidity is matched in the parameter table, from multiple row numbers to call a first row number, the first relay opening and closing time corresponding to the first row number drives the relay opening and closing of the compressor, and then in response to the current running time exceeding the predetermined running time, the fluctuation value of the indoor coil temperature is obtained, and finally the fluctuation value of the indoor coil temperature is matched with the coil temperature fluctuation interval to obtain a second row number; call the second relay opening and closing time corresponding to the second row number, and drive the relay opening and closing of the compressor with the second relay opening and closing time. The method solves the problem of poor user experience.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigeration conditioning. More particularly, the present application relates to a refrigeration system control method and system. BACKGROUND

[0002] A compressor is a mechanical device that compresses low-temperature and low-pressure gas (such as refrigerant) into high-temperature and high-pressure gas. It reduces the volume of gas through mechanical action, increases the pressure and temperature, and provides power for subsequent energy conversion or process flow. In a refrigeration system, the compressor is the core component that drives the refrigeration cycle. In traditional technology, in order to maintain the steady state of indoor temperature and humidity, and make the human body feel comfortable, a time-on / off relay is usually used to control the working state of the compressor. The refrigeration system based on this method belongs to an open-loop control system, which has low control accuracy and poor ability to maintain the steady state of temperature or humidity.

[0003] In order to solve the above technical problems, a temperature control device for a refrigeration system and a temperature control method thereof are disclosed in Chinese Patent No. CN116149399B. The PID closed-loop control system is used to accurately control the compressor controller to maintain the steady state of indoor temperature. This method has at least the following defects:

[0004] (1) If the parameters of the PID controller are not properly set, there will be a large temperature overshoot, which will cause the indoor temperature to rise or drop sharply in a short period of time, seriously affecting the user experience.

[0005] (2) There is no humidity adjustment feedback mechanism. Only temperature factors are considered for compressor adjustment, and the coupling relationship between humidity factors and temperature factors is ignored, which affects the user experience.

[0006] Therefore, the existing technology mainly has the problem of poor user experience. SUMMARY

[0007] To solve the above technical problem of poor user experience, the present application discloses a refrigeration system control method and system.

[0008] In a first aspect, the present application discloses a refrigeration system control method, comprising:

[0009] Collecting indoor coil temperature, indoor humidity and refrigeration system set temperature;

[0010] According to the refrigeration system set temperature, the corresponding parameter table is retrieved; the parameter table includes a plurality of row numbers, each row number corresponds to a refrigeration system set temperature, an indoor coil matching temperature, an indoor matching humidity, a coil temperature fluctuation interval, and a relay opening and closing time;

[0011] querying the indoor coil temperature in the parameter table to obtain a plurality of row numbers;

[0012] in response to the current running time being less than the predetermined running time, matching the indoor humidity in the parameter table to obtain a first row number from the plurality of row numbers, and driving the relay of the compressor according to a first relay opening and closing time corresponding to the first row number;

[0013] in response to the current running time being greater than the predetermined running time, obtaining a fluctuation value of the indoor coil temperature;

[0014] matching the fluctuation value of the indoor coil temperature with a coil temperature fluctuation interval to obtain a second row number, and driving the relay of the compressor according to a second relay opening and closing time corresponding to the second row number.

[0015] Advantages: After obtaining the set temperature of the refrigeration system, the method of the application queries the parameter table, and then queries a plurality of row numbers in the parameter table according to the indoor coil temperature. When the current running time is less than the predetermined running time, the indoor humidity is matched in the parameter table to obtain a first row number, and the relay of the compressor is driven according to a first relay opening and closing time corresponding to the first row number, as an open-loop control process. When the current running time is greater than the predetermined running time, a fluctuation value of the indoor coil temperature is obtained, and the fluctuation value of the indoor coil temperature is matched in the parameter table to obtain a second row number. The relay of the compressor is driven according to a second relay opening and closing time corresponding to the second row number, to realize closed-loop control. Compared with the prior art, the method of the application is a table lookup adjustment method combining open-loop and closed-loop control and considering the humidity factor, which can call more accurate relay opening and closing time according to the humidity factor and the fluctuation value of the indoor coil temperature, to avoid excessive refrigeration or excessive drying, so that the temperature and humidity of the human body in the indoor environment are suitable, and the problem of poor user experience in the prior art is solved.

[0016] Preferably, matching the indoor humidity in the parameter table to obtain a first row number from the plurality of row numbers comprises:

[0017] calculating a plurality of humidity difference values of the indoor humidity and a median value of the indoor matching humidity matched with the plurality of row numbers;

[0018] taking the first row sequence corresponding to the minimum humidity difference value and returning.

[0019] Preferably, the expression of taking the first row sequence corresponding to the minimum humidity difference value and returning is:

[0020]

[0021] In the formula, represents the actual returned row number, represents taking Find the row number corresponding to the minimum value and return that row number. The value, Indicates indoor humidity. Indicates row number The corresponding median indoor humidity.

[0022] Beneficial Effects: This invention addresses the drawback of traditional lookup methods that return multiple values ​​by proposing a lookup optimization strategy. This strategy extracts the optimal row number by iterating through the table and extracting the minimum humidity difference. This lookup method achieves a one-step solution, resolving the issues of cumbersome if / else query logic and low processing efficiency. It can quickly process large-scale parameter table data. Based on this fast lookup optimization strategy, the relay adjustment response time is significantly shortened, and the lookup results are more accurate. This facilitates faster attainment of steady-state indoor temperature and humidity, improving the user experience.

[0023] Preferably, after retrieving the opening and closing time of the second relay corresponding to the second row number and driving the compressor's relay to open and close using the opening and closing time of the second relay, the method of the present invention further includes:

[0024] If the indoor coil temperature fluctuation is within the coil temperature fluctuation range and the indoor humidity exceeds the preset indoor matching humidity, the relay will remain closed and the compressor load current will be reduced to the preset minimum load current.

[0025] Beneficial effects: When the indoor coil temperature fluctuation is within the preset temperature fluctuation range, the relay is kept closed to keep the compressor running, thereby reducing the cooling effect and maintaining the drying effect. At the same time, the compressor load current is reduced, which can reduce energy consumption.

[0026] Preferably, if the fluctuation value of the indoor coil temperature is within the coil temperature fluctuation range and the indoor humidity exceeds the preset indoor matching humidity, the method of the present invention further includes:

[0027] The indoor unit is driven to increase the air volume.

[0028] Preferably, in response to the input of a user's intelligent control mode command, after retrieving the opening and closing time of the second relay corresponding to the second row number, the method of the present invention further includes:

[0029] Get the set wind speed, outlet wind speed, outlet air temperature, return air temperature, outdoor humidity, and damper opening;

[0030] The set wind speed, outlet wind speed, baffle opening, outlet air temperature, return air temperature, outdoor humidity, and indoor humidity are input into the duct efficiency factor model based on thermodynamic laws and fluid mechanics theory to calculate the duct efficiency factor.

[0031] The second relay opening and closing time is corrected by using the air duct efficiency factor.

[0032] Beneficial effects: the method corrects the second relay opening and closing time by using the dynamic air duct efficiency factor, can more accurately adjust the relay opening and closing time, avoids excessive refrigeration or excessive drying, and makes the human body suitable for temperature and humidity perception in the indoor environment.

[0033] Specifically, the air duct efficiency factor model comprises:

[0034]

[0035] In the formula, The air duct efficiency factor is represented by The air duct efficiency factor is represented by The air duct efficiency factor is represented by The air duct efficiency factor is represented by The air duct efficiency factor is represented by

[0036] Preferably, after the relay opening and closing of the compressor is driven by the first relay opening and closing time corresponding to the first row number, the method further comprises:

[0037] Collecting the outdoor unit operating temperature;

[0038] If the outdoor unit operating temperature is higher than the temperature protection threshold, the relay is disconnected.

[0039] Beneficial effects: by the above technical solution, the overheat protection of the compressor can be realized, and the service life of the compressor is prolonged.

[0040] Preferably, after the relay opening and closing of the compressor is driven by the first relay opening and closing time corresponding to the first row number, the method further comprises:

[0041] Collecting the compressor working current;

[0042] If the working current is higher than the overcurrent safety threshold, the relay is disconnected.

[0043] In the second aspect, the application discloses a compressor control system, comprising a processor and a memory, the memory stores computer program instructions, and when the computer program instructions are executed by the processor, the refrigeration system control method of the first aspect is realized.

[0044] The beneficial effects of the application are:

[0045] (1) Compared with the prior art, the method of the present application belongs to an open-close loop combined humidity factor table lookup adjustment method, which can call more accurate relay opening and closing time according to the humidity factor and the fluctuation value of the indoor coil temperature, so as to avoid excessive refrigeration or excessive drying, so that the human body in the indoor environment is suitable for temperature and humidity perception, and the problem of poor user experience of the prior art is solved.

[0046] (2) Compared with the prior art, the method of the present application solves the problems of non-compactness and low processing efficiency of the existing if, else query logic, and can quickly process large-scale parameter table data. Based on the fast table lookup optimization strategy, the adjustment response time of the relay can be greatly shortened, which is beneficial to promote the indoor temperature and humidity to enter the steady state faster, and improve the user experience. BRIEF DESCRIPTION OF DRAWINGS

[0047] Figure 1 is a flow chart of the refrigeration system control method in the first embodiment of the present application;

[0048] Figure 2 is a structural schematic diagram of the compressor control system in the third embodiment of the present application. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0050] The specific embodiments of the present application will be described in detail below with reference to the drawings.

[0051] Embodiment One

[0052] As shown in the figure, the present embodiment discloses a refrigeration system control method, comprising: Figure 1

[0053] S10: Collecting indoor coil temperature, indoor humidity and refrigeration system set temperature.

[0054] In the present embodiment, the above-mentioned indoor coil temperature refers to the indoor coil temperature of the refrigeration system (air conditioning system), which is collected by the temperature sensor arranged on the coil. Generally, the indoor coil temperature tends to be the same as the indoor temperature, and when the compressor starts, the indoor coil temperature will change (generally, the temperature drops sharply) according to the set temperature, so as to realize heat transfer between the coil and the indoor environment. The indoor humidity is collected by the humidity sensor arranged in the indoor unit of the refrigeration system. The refrigeration system set temperature is generally set by the remote controller of the refrigeration system.

[0055] ​S20: According to the refrigeration system setting temperature, the corresponding parameter table is retrieved.

[0056] In the embodiment, the parameter table includes a plurality of row numbers, each of which corresponds to a refrigeration system setting temperature, an indoor coil matching temperature, an indoor matching humidity, a coil temperature fluctuation range, and a relay opening and closing time (as shown in Table 1 below). The parameter table corresponding to each indoor setting temperature is different. The above-mentioned parameter table can be pre-stored in the microcontroller (such as STM32, PIC, etc.) of the refrigeration system through a specific data structure body (C language, assembly or other customized format).

[0057] For example, if the currently collected indoor coil temperature is 25°, the parameter table (as shown in Table 1 below) is retrieved.

[0058] S30: Query the plurality of row numbers of the indoor coil temperature in the parameter table.

[0059] For example, as shown in Table 1 below, if the currently collected indoor coil temperature is 15°, since 15° falls within the indoor coil matching temperature 10℃-18℃ corresponding to T2501, T2502 and T2503, the plurality of row numbers refer to T2501, T2502 and T2503.

[0060] S40: In response to the current running time being less than the predetermined running time, the indoor humidity is matched in the parameter table, a first row number is retrieved from the plurality of row numbers, and the first relay opening and closing time corresponding to the first row number is used to drive the relay opening and closing of the compressor.

[0061] In the embodiment, the predetermined running time generally refers to the first compressor running period of the refrigeration system, which is generally 15min-60min.

[0062] S50: In response to the current running time exceeding the predetermined running time, the fluctuation value of the indoor coil temperature is obtained.

[0063] In the embodiment, after the current running time exceeds the first period, it is determined that the current running time exceeds the predetermined running time, that is, the predetermined running time can be one period, and in other embodiments, it can also exceed one period; generally, the predetermined running time is preferably more than one period. The fluctuation value of the indoor coil temperature refers to the fluctuation value of the current indoor coil temperature relative to the indoor coil temperature of the last period. The length of the above-mentioned one period is equal to the sum of the relay closing time and the relay opening time.

[0064] S60: Match the fluctuation value of the indoor coil temperature with the coil temperature fluctuation range to obtain a second row number; retrieve the second relay opening and closing time corresponding to the second row number to drive the relay opening and closing of the compressor.

[0065] Through the above steps S10-S60, the method mainly adopts a table lookup method to call the relay opening and closing time to regulate the working state of the relay. This method is safe and reliable, and does not have the problem of overshoot of PID control. The above method can accurately adjust the relay opening and closing time according to the fluctuation value of humidity and indoor coil temperature, to avoid overcooling or overdrying in the room, so that the human skin perception is more comfortable, thereby solving the problem of poor user experience in the prior art.

[0066] Preferably, before the above step S10, the method further comprises:

[0067] The preset soft starter is connected in series with the relay.

[0068] Specifically, by connecting the soft starter in series with the relay, the soft starter gradually increases the compressor voltage by controlling the thyristor conduction angle, limits the starting current (usually 2-4 times the rated current), avoids mechanical impact and power grid fluctuation, and realizes smooth starting of the relay.

[0069] Exemplarily, the indoor set temperature is set to 25℃, the adjustment period is set to 30min (i.e. the total time length of the relay closing time and the relay opening time), and the parameter table of the above step S20 can be as follows:

[0070] Table 1

[0071]

[0072] It should be explained that for the human body, the most comfortable humidity is 40%-60%, and higher than this indoor matching humidity will promote the breeding of indoor allergens such as mold and dust mites, and will also aggravate the "stuffy feeling", and lower than this indoor matching humidity will cause the respiratory mucosa to dry, which is specifically manifested as "dry throat" or "nosebleed". For the temperature difference, the most comfortable temperature fluctuation range is-3℃~+3℃, and exceeding this range will be easily perceived by the body surface and cause symptoms of discomfort. The above parameter table empirically summarizes the most comfortable humidity for the human body, the most comfortable temperature fluctuation range, and the relationship between the indoor coil and the indoor temperature. In actual application scenarios, the coil temperature fluctuation range and the actual humidity are not strongly related. For example, in southern regions, even if the indoor actual temperature is 25℃, the indoor actual humidity can reach 80%-90%, and the body temperature can still reach 28℃, making the human body feel hot, and the compressor needs to work to achieve the effect of dehumidification. In view of such a situation, multiple sets of relay opening and closing time parameters for different humidity conditions need to be configured for the same indoor coil matching temperature to meet the actual needs of different regions.

[0073] In other embodiments, the above-mentioned one cycle can be set to any value between 10 min and 120 min.

[0074] It should be noted that the above-mentioned parameter table is only a selection parameter for the indoor set temperature of 25°C. In actual application environment, for the indoor set temperature of 16°C to 30°C, corresponding parameter tables are set.

[0075] Further, in the above-mentioned step S40, the indoor humidity is matched in the parameter table, and a first row sequence number is called from a plurality of row sequence numbers, including:

[0076] S41: Calculate a plurality of humidity difference values of the indoor humidity and the indoor matching humidity median value matched by the plurality of row sequence numbers.

[0077] S42: Take the first row sequence number corresponding to the minimum humidity difference value and return.

[0078] Wherein, the expression of taking the first row sequence number corresponding to the minimum humidity difference value and returning in the above-mentioned step S42 is:

[0079]

[0080] In the formula, indicates the actual returned row sequence number, indicates the row sequence number corresponding to the minimum value of the value of indicates the indoor humidity, indicates the row sequence number corresponding to the indoor matching humidity median value.

[0081] For example, the plurality of row sequence numbers obtained according to step S30 are T2501, T2502 and T2503. If the collected indoor humidity is 76, then according to S42, the matching humidity median values corresponding to T2501-T2503 are 85, 75 and 65, respectively. Obviously, the difference of the matching humidity median value corresponding to T2502 is the minimum. Therefore, the returned first row sequence number is T2502.

[0082] ​It needs to be explained that the traditional table lookup method usually adopts the sequential linear query method to obtain the optimal relay control formula, and the data query logic generally adopts the if, else if query logic. The underlying query code of this set of query logic will expand with the increase of the parameter table data, which is not conducive to the realization of modularization and standardization, and the maintenance cost is too high. In order to solve the above problems, the argmin logic is adopted for query in the embodiment method, which can realize parallel query, support GPU query acceleration, quickly process large-scale parameter table data, greatly shorten the adjustment response time of the relay (from seconds to milliseconds), effectively avoid the interruption or misadjustment of the next adjustment period due to table lookup delay, and promote the indoor temperature and humidity to enter the steady state faster.

[0083] It needs to be explained that the built-in parameters of the data structure corresponding to each parameter table are different, and the source of such parameters can be obtained by summarizing the production quality inspection data (usually in the form of an Excel file). In the traditional data structure construction process, the built-in parameters of the parameter table need to be manually entered one by one, which is time-consuming and laborious. In order to overcome the above problems, in this embodiment, for the construction of the data structure corresponding to the parameter table, the Excel plug-in can be called in combination with the structure definition template to realize the automatic input of the above built-in parameters.

[0084] Further, after the above step S60, the embodiment method further includes:

[0085] If the fluctuation value of the indoor coil temperature is in the coil temperature fluctuation interval and the indoor humidity exceeds the preset indoor matching humidity, the relay is maintained closed and the load current of the compressor is reduced to the preset minimum load current.

[0086] In combination with the above Table 1, taking the row number T2504 as an example, if the fluctuation value of the indoor coil temperature is in the preset temperature fluctuation interval, i.e. the temperature fluctuation interval is -1℃~+1℃, but the indoor humidity is 80%, which is obviously higher than the indoor matching humidity of 50%~60%, at this time, the relay closing time will be prolonged until the next execution period is re-judged. In this scenario, if the power of the compressor remains unchanged, it will cause the indoor temperature to continue to decrease, exceeding the acceptable range of the set temperature, and destroying the temperature steady state, while the compressor not working may not achieve the ideal dehumidification effect. In order to avoid such situations, the embodiment method reduces the working power of the compressor by reducing the load current of the compressor, which can reduce energy consumption on the one hand, and reduce the possibility of destroying the temperature steady state on the other hand, and also maintain good dehumidification effect.

[0087] Further, if the fluctuation value of the indoor coil temperature is in the coil temperature fluctuation interval and the indoor humidity exceeds the preset indoor matching humidity, the embodiment method further includes:

[0088] Drive the indoor unit to increase the air supply.

[0089] Specifically, by increasing the air supply, the air mass passing through the indoor coil per unit time can be increased, and the condensate capture amount can be increased, thereby promoting the dehumidification effect.

[0090] Through the above technical solution, the dehumidification scheme of the method of the embodiment belongs to the combination scheme of temperature difference driven dehumidification and increased air volume dehumidification. This way is conducive to improving the efficiency of indoor dehumidification.

[0091] Further, the method of the embodiment also designs an over-temperature protection and over-current protection scheme.

[0092] For over-temperature protection, the method of the embodiment further comprises:

[0093] Collect the operating temperature of the outdoor unit.

[0094] In the embodiment, the operating temperature of the outdoor unit can be collected by a sensor arranged near the compressor.

[0095] If the operating temperature of the outdoor unit is higher than the temperature protection threshold, the drive relay is disconnected.

[0096] In the embodiment, the temperature protection threshold has a value range of 110°C to 135°C.

[0097] Through the above technical solution, when the operating temperature of the outdoor unit is too high, the compressor is stopped in time, avoiding the compressor working continuously in a high-temperature environment, which is conducive to prolonging the service life of the compressor.

[0098] For over-current protection, the method of the embodiment further comprises:

[0099] Collect the working current of the compressor.

[0100] If the working current is higher than the over-current safety threshold, the drive relay is disconnected.

[0101] In the embodiment, the over-current safety threshold can be 1.1-1.25 times the rated working current of the compressor.

[0102] Through the above technical solution, when the compressor is in an over-current operating condition, the compressor can be stopped in time by disconnecting the relay, so as to avoid the compressor working continuously in an over-current environment, which is conducive to avoiding the compressor from burning out or causing a safety accident.

[0103] For example, in step S60, the fluctuation value of the indoor coil temperature is matched with the coil temperature fluctuation interval to obtain a second row number, and the process is as follows:

[0104] The fluctuation value of the indoor coil temperature is matched with multiple coil temperature fluctuation intervals in the parameter table;

[0105] The row sequence number corresponding to the matched coil temperature fluctuation interval is taken as the second row sequence.

[0106] For example, according to Table 1, if the first row sequence number is T2503, according to step S60, the fluctuation value of the indoor coil temperature is 4°, and since it falls into the coil temperature fluctuation interval corresponding to T2503, the matched second row sequence number is still T2503.

[0107] According to Table 1, if the first row sequence number is T2503, according to step S60, the fluctuation value of the indoor coil temperature is -7°, and since it falls into the coil temperature fluctuation interval corresponding to T2502, the matched second row sequence number is T2502.

[0108] In summary of the above technical description, the method of the embodiment has at least the following advantages:

[0109] (1) Better user experience

[0110] The method of the embodiment uses a lookup table and a multi-dimensional parameter table to achieve accurate acquisition of relay opening and closing time data, maintain the stability of indoor temperature and humidity, and achieve better user experience.

[0111] (2) Higher reliability and safety

[0112] The method of the embodiment is a refrigeration system control method based on relay driving, which is safer and more reliable than intelligent electronic power switch driving. On this basis, the method of the embodiment also designs an overheat protection and overcurrent protection scheme, which can make the compressor always operate in a safe working condition.

[0113] (3) Faster query response, shorter time to enter temperature and humidity steady state

[0114] The method of the embodiment proposes a parallel query method based on argmin logic. This method can quickly process large-scale parameter table data, greatly shorten the response time of the relay adjustment (from seconds to milliseconds), effectively avoid the situation that the next adjustment period is interrupted or misadjusted due to lookup delay, and is conducive to promoting the indoor temperature and humidity to enter the steady state faster.

[0115] Embodiment Two

[0116] The embodiment discloses a refrigeration system control method, in response to the input of a user intelligent control mode instruction, on the basis of the method of embodiment one, the method of the embodiment further comprises:

[0117] S100: Acquires set wind speed, outlet wind speed, outlet air temperature, return air temperature, outdoor humidity, and baffle opening.

[0118] In this embodiment, the outlet air velocity can be calculated based on the operating power of the cooling system fan; a temperature sensor is installed near the baffle of the indoor unit of the cooling system to obtain the outlet air temperature; a temperature sensor is installed on the top of the indoor unit of the cooling system to obtain the return air temperature; the outdoor humidity can be obtained by a humidity sensor installed on the outdoor unit; and the baffle opening can be obtained by a stepper drive motor of the indoor unit of the cooling system.

[0119] S200: Input the set wind speed, outlet wind speed, baffle opening, outlet air temperature, return air temperature, outdoor humidity, and indoor humidity into the duct efficiency factor model based on thermodynamic laws and fluid mechanics theory to calculate the duct efficiency factor.

[0120] The duct efficiency factor model is as follows:

[0121]

[0122] In the formula, Indicates the duct efficiency factor. Indicates the outlet wind speed. This indicates the set wind speed. Represents the thermodynamic coefficient. This indicates the opening degree of the baffle.

[0123] More specifically, the calculation method for the thermodynamic coefficient is as follows:

[0124]

[0125] In the formula, It represents the amount of heat required for a unit mass of liquid water to completely transform into water vapor at a constant temperature; It represents the amount of heat required for a unit mass of standard dry air to increase in temperature by 1°C under constant pressure. Indicates outdoor humidity. Indicates indoor humidity. Indicates the outlet air temperature. This indicates the return air temperature.

[0126] It should be explained that, based on the free jet characteristics in fluid dynamics theory, when cold air is ejected from the baffle outlet, it forms a turbulent free jet with a diffusion angle. With the opening of the baffle The relationship is:

[0127]

[0128] Based on the above relationships and combined with the experimental data, the following corresponding relationship table 2 can be obtained:

[0129] Table II

[0130]

[0131] Therefore, based on the fitting relationship, the calculation term of the damper opening degree in the duct efficiency factor model can be obtained.

[0132] S300: The relay opening and closing time is corrected by using the duct efficiency factor.

[0133] Specifically, the correction formula is as follows:

[0134]

[0135] In the formula, represents the relay closing time, represents the relay opening time, represents the relay closing time corresponding to the row number retrieved based on step S40, represents the upper limit value of the adjustment period. If is greater than , is taken as .

[0136] For example, in order to more intuitively illustrate the technical effect, based on the calculation result, the effect table shown in Table III can be obtained:

[0137] Table III

[0138]

[0139] Taking the south wind weather unique to the South China region as an example, at the beginning of starting the refrigeration system, the indoor humidity is high, and the humidity difference between indoor and outdoor is small. If the temperature difference between the supply air and the return air is large, it means that the refrigeration time needs to be prolonged. At this time, the duct efficiency factor corresponding to the actual situation is dynamically adjusted. After a period of time, the indoor humidity is removed, and the temperature and humidity difference between indoor and outdoor increases, while the temperature difference between the supply air and the return air decreases. At this time, the demand for refrigeration is weakened, and the relay closing time can be maintained or shortened to achieve heat preservation and humidity maintenance.

[0140] Through the above steps S100-S300, the method of the embodiment can perform multi-dimensional data analysis based on the indoor and outdoor humidity difference and the supply and return air condition, so as to obtain more accurate relay opening and closing time, and further promote the indoor temperature and humidity to enter the steady state more quickly.

[0141] Example Three

[0142] For example, Figure 2As shown, the embodiment discloses a compressor control system, comprising a processor and a memory, the memory stores computer program instructions, when the computer program instructions are executed by the processor, the refrigeration system control method recorded in embodiment one is realized.

[0143] While the present specification has shown and described a number of embodiments of the application, it will be apparent to those of ordinary skill in the art that numerous alternatives can be made without departing from the scope of the present application.

Claims

1. A method of controlling a refrigeration system, characterized by, The method comprises the following steps: Collecting indoor coil temperature, indoor humidity and refrigeration system set temperature; According to the refrigeration system set temperature, a corresponding parameter table is called; the parameter table comprises a plurality of row numbers, each row number corresponding to a refrigeration system set temperature, an indoor coil matching temperature, an indoor matching humidity, a coil temperature fluctuation interval, and a relay opening and closing time; Querying the indoor coil temperature in the plurality of row numbers in the parameter table; In response to the current running time being less than the predetermined running time, the indoor humidity is matched in the parameter table, a first row number is called from the plurality of row numbers, and the first relay opening and closing time corresponding to the first row number is used to drive the relay opening and closing of the compressor; In response to the current running time being greater than the predetermined running time, the fluctuation value of the indoor coil temperature is obtained; the fluctuation value of the indoor coil temperature refers to the fluctuation value of the current indoor coil temperature relative to the indoor coil temperature of the last period; the time length of one period is equal to the sum of the relay closing time and the relay opening time; The fluctuation value of the indoor coil temperature is matched with the coil temperature fluctuation interval to obtain a second row number; the second relay opening and closing time corresponding to the second row number is called to drive the relay opening and closing of the compressor.

2. The refrigeration system control method according to claim 1, wherein Matching the indoor humidity in the parameter table, a first row number is called from the plurality of row numbers, comprising: Calculating a plurality of humidity difference values of the indoor humidity and the indoor matching humidity values matched with the plurality of row numbers; Taking the first row sequence corresponding to the minimum humidity difference value and returning.

3. The refrigeration system control method according to claim 2, wherein, The expression for taking the first row sequence corresponding to the minimum humidity difference value and returning is: wherein, represents the actual returned row number, represents the minimum value of the row numbers corresponding to the minimum value of the row numbers and returns the row number represents the indoor humidity, represents the row number corresponding to the median value of the indoor matching humidities.

4. The refrigeration system control method of claim 1, wherein After calling the second relay opening and closing time corresponding to the second row number and driving the relay opening and closing of the compressor, the method further comprises: If the fluctuation value of the indoor coil temperature is located in the coil temperature fluctuation interval and the indoor humidity exceeds the preset indoor matching humidity, the relay is maintained closed and the load current of the compressor is reduced to the preset minimum load current.

5. The method of claim 4, wherein, If the fluctuation value of the indoor coil temperature is located in the coil temperature fluctuation interval and the indoor humidity exceeds the preset indoor matching humidity, the method further comprises: Driving the indoor unit to increase the air supply amount.

6. The refrigeration system control method of claim 1, wherein In response to the input of the user intelligent control mode instruction, after calling the second relay opening and closing time corresponding to the second row number, the method further comprises: Obtaining the set air speed, the outlet air speed, the outlet air temperature, the return air temperature, the outdoor humidity and the baffle opening degree; Inputting the set air speed, the outlet air speed, the baffle opening degree, the outlet air temperature, the return air temperature, the outdoor humidity and the indoor humidity into the air duct efficiency factor model based on the laws of thermodynamics and fluid mechanics to calculate the air duct efficiency factor; The air duct efficiency factor is used to correct the second relay opening and closing time.

7. The method of claim 6 wherein, The air duct efficiency factor model comprises: In the formula, Indicates the duct efficiency factor. Indicates the outlet wind speed. This indicates the set wind speed. Represents the thermodynamic coefficient. This indicates the opening degree of the baffle.

8. The method of claim 1 wherein, After driving the relay opening and closing of the compressor with the first relay opening and closing time corresponding to the first row number, the method further comprises: Collecting the outdoor unit running temperature; If the outdoor unit operating temperature is higher than a temperature protection threshold, the relay is driven to be opened.

9. The method of claim 1 wherein, After driving the relay of the compressor to be opened and closed according to the first relay opening and closing time corresponding to the first row number, the method further comprises: acquiring the operating current of the compressor; If the operating current is higher than an overcurrent safety threshold, the relay is driven to be opened.

10. A compressor control system characterized by, The refrigeration system comprises a processor and a memory, and the memory stores computer program instructions which, when executed by the processor, implement the refrigeration system control method of any one of claims 1-9.

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