CN113830115B - Variable-frequency subway air conditioning unit control method and device and readable storage medium - Google Patents
Variable-frequency subway air conditioning unit control method and device and readable storage medium Download PDFInfo
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- CN113830115B CN113830115B CN202010989106.4A CN202010989106A CN113830115B CN 113830115 B CN113830115 B CN 113830115B CN 202010989106 A CN202010989106 A CN 202010989106A CN 113830115 B CN113830115 B CN 113830115B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61D—BODY DETAILS OR KINDS OF RAILWAY VEHICLES
- B61D27/00—Heating, cooling, ventilating, or air-conditioning
- B61D27/0018—Air-conditioning means, i.e. combining at least two of the following ways of treating or supplying air, namely heating, cooling or ventilating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T30/00—Transportation of goods or passengers via railways, e.g. energy recovery or reducing air resistance
Abstract
The application relates to a control method and device for a variable frequency subway air conditioner unit and a readable storage medium, wherein the control method for the variable frequency subway air conditioner unit comprises the following steps: acquiring outdoor temperature outside the subway at preset time intervals; obtaining a change value of the outdoor temperature according to the current outdoor temperature and the outdoor temperature at the previous time point; if the change value is larger than the deviation starting threshold, inputting the change value into a temperature control model to obtain a frequency adjustment value; and adjusting the frequency of the compressor of the air conditioning unit to a frequency adjustment value. According to the application, the change of the load in the vehicle caused by the change of the outdoor temperature is adapted according to the frequency of the active preset variable-frequency compressor, the problem that the outdoor temperature fluctuates severely when entering and exiting the tunnel is solved, and the indoor temperature is kept at a comfortable temperature.
Description
Technical Field
The application relates to the technical field of variable frequency air conditioners of trains, in particular to a variable frequency subway air conditioner unit control method and device and a readable storage medium.
Background
The variable frequency air conditioner of the train of each carriage generally comprises a plurality of air conditioning units, each air conditioning unit generally comprises at least one air conditioning system, and each air conditioning system comprises at least one compressor, so the variable frequency air conditioner of the train of each carriage generally comprises a plurality of compressors. For variable frequency air conditioning units, the higher the operating frequency of the compressor, the higher the refrigeration/heat generated by the corresponding air conditioning system. The operating frequency of the compressor is determined based on a rated frequency, which is a rated frequency at which rated cooling/heating can be achieved, and a temperature difference coefficient, which is determined by a difference between an actual temperature and a target temperature in the vehicle cabin.
At present, subway lines of part of overhead stations often have severe fluctuation in external temperature due to the influence of entering and exiting tunnels, so that temperature fluctuation in the vehicle is caused.
At present, no effective solution is proposed for the problem that the temperature in the vehicle fluctuates due to severe fluctuation of the external temperature when entering and exiting a tunnel in the related technology.
Disclosure of Invention
The embodiment of the application provides a control method, a control device and a readable storage medium of a variable-frequency subway air conditioning unit, which at least solve the problem that in-vehicle temperature fluctuation is caused by severe fluctuation of external temperature when entering and exiting a tunnel in the related technology.
In a first aspect, an embodiment of the present application provides a control method for a variable frequency subway air conditioning unit, including:
acquiring outdoor temperature outside the subway at preset time intervals;
obtaining a change value of the outdoor temperature according to the current outdoor temperature and the outdoor temperature at the previous time point;
if the change value is larger than the deviation starting threshold, inputting the change value into a temperature control model to obtain a frequency adjustment value;
and adjusting the frequency of the compressor of the air conditioning unit to a frequency adjustment value.
In some of these embodiments, subway structure parameters are obtained along with a minimum adjustable refrigeration capacity;
obtaining a deviation starting threshold according to the subway structure parameters and the minimum adjustable refrigerating capacity;
and if the change value is larger than the deviation starting threshold, inputting the change value into a temperature control model to obtain a frequency adjustment value.
In some of these embodiments, the subway structure parameters include: solar radiation received by the transparent enclosure, solar heat gain coefficient, vehicle body enclosure heat transfer coefficient and heat transfer area.
In some embodiments, historical operation data of the subway air conditioning unit in a preset time period is obtained;
acquiring an outdoor temperature corresponding frequency calculation coefficient, an in-vehicle temperature correction coefficient and an outdoor temperature correction coefficient according to the historical operation data;
and generating a temperature control model according to the frequency calculation coefficient corresponding to the outdoor temperature, the temperature correction coefficient in the vehicle and the outdoor temperature correction coefficient.
In some embodiments, according to the historical operation data, solar radiation, solar heat gain coefficient, vehicle body enclosure heat transfer coefficient and heat transfer area received by the transparent enclosure are obtained;
and obtaining the frequency calculation coefficient corresponding to the outdoor temperature according to the solar radiation, the solar heat gain coefficient, the vehicle body enclosing structure heat transfer coefficient and the heat transfer area received by the transparent enclosing structure.
In some of these embodiments, the temperature control model is Δf 2 ＝A*(Te n -Te n-1 )*BT k *CT 0 。
In some embodiments, acquiring a temperature value of a sensor in the subway room and a return air temperature correction value;
and obtaining an actual indoor temperature value according to the indoor sensor temperature value and the return air temperature correction value.
In a second aspect, an embodiment of the present application provides a control device for a variable frequency subway air conditioning unit, which is characterized by including:
the temperature acquisition module is used for acquiring outdoor temperature outside the subway;
the change value acquisition module is used for acquiring a change value of the outdoor temperature according to the outdoor temperature;
the frequency calculation module is used for inputting the change value into the temperature control model to obtain a frequency adjustment value if the change value is larger than the deviation starting threshold value;
and the frequency adjusting module is used for adjusting the frequency of the compressor of the air conditioning unit according to the frequency adjusting value.
In a third aspect, an embodiment of the present application provides a computer device, including a memory, a processor, and a computer program stored in the memory and capable of running on the processor, where the processor implements the control method of the variable frequency subway air conditioning unit according to the first aspect when executing the computer program.
In a fourth aspect, an embodiment of the present application provides a computer readable storage medium, on which a computer program is stored, which when executed by a processor, implements a control method for a variable frequency metro air conditioning unit as described in the first aspect above.
Compared with the related art, the control method of the variable frequency subway air conditioning unit provided by the embodiment of the application adapts to the change of the load in the vehicle caused by the change of the outdoor temperature by actively presetting the frequency of the variable frequency compressor, solves the problem that the outdoor temperature fluctuates severely when entering and exiting a tunnel, and realizes that the indoor temperature is kept at a comfortable temperature.
The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below to provide a more thorough understanding of the other features, objects, and advantages of the application.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
fig. 1 is a flowchart of a control method of a variable frequency subway air conditioning unit according to an embodiment of the present application;
fig. 2 is a flowchart of a control method of a variable frequency subway air conditioning unit according to another embodiment of the present application;
fig. 3 is a block diagram of a control device of a variable frequency subway air conditioning unit according to an embodiment of the present application;
fig. 4 is a schematic hardware structure diagram of a variable frequency subway air conditioning unit control device according to an embodiment of the application.
Detailed Description
The present application will be described and illustrated with reference to the accompanying drawings and examples in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application. All other embodiments, which can be made by a person of ordinary skill in the art based on the embodiments provided by the present application without making any inventive effort, are intended to fall within the scope of the present application.
It is apparent that the drawings in the following description are only some examples or embodiments of the present application, and it is possible for those of ordinary skill in the art to apply the present application to other similar situations according to these drawings without inventive effort. Moreover, it should be appreciated that while such a development effort might be complex and lengthy, it would nevertheless be a routine undertaking of design, fabrication, or manufacture for those of ordinary skill having the benefit of this disclosure, and thus should not be construed as having the benefit of this disclosure.
Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is to be expressly and implicitly understood by those of ordinary skill in the art that the described embodiments of the application can be combined with other embodiments without conflict.
Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. The terms "a," "an," "the," and similar referents in the context of the application are not to be construed as limiting the quantity, but rather as singular or plural. The terms "comprising," "including," "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, article, or apparatus that comprises a list of steps or modules (elements) is not limited to only those steps or elements but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. The terms "connected," "coupled," and the like in connection with the present application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The term "plurality" as used herein means two or more. "and/or" describes an association relationship of an association object, meaning that there may be three relationships, e.g., "a and/or B" may mean: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship. The terms "first," "second," "third," and the like, as used herein, are merely distinguishing between similar objects and not representing a particular ordering of objects.
The current air-conditioning temperature control system of the subway vehicle performs corresponding start-stop control and variable frequency adjustment according to the difference value between the indoor temperature and the target temperature. Fig. 1 is a flowchart of a control method of a variable frequency subway air conditioning unit according to an embodiment of the present application, as shown in fig. 1, the flowchart includes the steps of:
step S101, comparing the outdoor temperature Te variation value.
Specifically, an outdoor temperature outside the subway is obtained through a temperature sensor, and a change value of the outdoor temperature is obtained according to the current outdoor temperature and the previous outdoor temperature.
Step S102, judging the current outdoor temperature Te n -previous point in time outdoor temperature Te n-1 The outdoor temperature deviation starts a tuning amount X.
Specifically, if the current outdoor temperature Ten-the outdoor temperature Ten-1 at the previous time point is smaller than or equal to the outdoor temperature deviation starting adjustment amount X, continuously comparing the outdoor temperature Te change value; and if the current outdoor temperature Ten-the outdoor temperature Ten-1 at the previous time point is greater than the outdoor temperature deviation starting threshold X, the frequency of the compressor is regulated. When the change of the outdoor temperature exceeds the deviation starting threshold X, namely, the change of the outdoor temperature is considered to cause the change of the indoor temperature, and the change of the outdoor temperature exceeds the minimum adjustable quantity of the variable frequency adjustment of the air conditioning unit, the variable frequency of the air conditioning unit can be correspondingly matched.
Step S103, compressor frequency adjustment.
Specifically, the compressor performs temperature adjustment according to a cooling mode, and by acquiring the indoor temperature and the target temperature, the compressor performs frequency adjustment or start-stop according to the difference between the indoor temperature and the target temperature. By detecting the indoor temperature, the indoor temperature is compared with the target temperature calculated by the preset logic, then corresponding adjustment is carried out, and the adjustment amount cannot be in place once. Further, the outdoor temperature and the indoor temperature are obtained through preset time intervals and are continuously compared and adjusted, and the temperature is gradually stabilized.
In this embodiment, when the compressor is running, under the condition that there is no frequency constraint, the target frequency is calculated by using Tin and Tic or Tih and Δt through PID, and the PID calculation formula is determined by the control system. Wherein Tin is the indoor temperature, tic is the refrigeration target temperature, tih is the refrigeration target temperature, and DeltaT is the temperature deviation value.
Setting a temperature deviation value delta T in a formula of a PID (proportion integration differentiation) meter compressor, and when the delta T is less than or equal to the Tin-Tic and less than or equal to delta T (refrigeration) or the delta T is less than or equal to Tin-Tic and less than or equal to delta T (heating); when the PID stops calculating, the target frequency remains unchanged.
The following is PID calculation formula adjustment logic for the target temperature of refrigeration:
when Tin is more than or equal to tic+2 delta T, the control system controls the compressor to start; when Tin is more than tic+DeltaT, the control system judges the temperature change trend and the difference between Tin and Tic when the compressor is operated, and the operation frequency of the compressor is automatically improved; when Tic-DeltaT is less than or equal to Tin and less than or equal to Tic+ DeltaT, the control system keeps the running frequency of the compressor; when Tin is less than Tic-delta T, the control system judges the temperature change trend and the difference between Tin and Tic when the compressor runs, and the running frequency of the compressor is automatically reduced; when Tin is less than or equal to Tic-2 delta T, the control system controls the compressor to stop.
The embodiment also provides a control method of the variable-frequency subway air conditioning unit. Fig. 2 is a flowchart of a control method of a variable frequency subway air conditioning unit according to another embodiment of the present application, as shown in fig. 2, the flowchart includes the steps of:
step S201, acquiring outdoor temperature outside the subway at preset time intervals.
Specifically, the temperature sensor acquires the outdoor temperature outside the subway according to a preset time interval. In this embodiment, the time interval may be 4 seconds, 5 seconds, 6 seconds, or other values.
Step S202, obtaining a variation value of the outdoor temperature according to the current outdoor temperature and the outdoor temperature at the previous time point.
Specifically, the change value of the outdoor temperature is obtained by subtracting the outdoor temperature at the previous point in time from the current outdoor temperature Te.
Step S203, if the variation value is greater than the deviation starting threshold, inputting the variation value into a temperature control model to obtain a frequency adjustment value.
Specifically, if the variation value is larger than the deviation starting threshold, inputting the variation value into a temperature control model to obtain a frequency adjustment value; and if the change value is smaller than or equal to the deviation starting threshold value, calculating the change value of the next outdoor temperature according to the outdoor temperature at the next time point and the current outdoor temperature.
If the variation value is greater than the deviation starting threshold, inputting the variation value into a temperature control model, and obtaining a frequency adjustment value comprises: obtaining subway structure parameters and minimum adjustable refrigerating capacity; obtaining a deviation starting threshold according to the subway structure parameters and the minimum adjustable refrigerating capacity; and if the change value is larger than the deviation starting threshold, inputting the change value into a temperature control model to obtain a frequency adjustment value.
Wherein, the subway structure parameters include: solar radiation received by the transparent enclosure, solar heat gain coefficient, vehicle body enclosure heat transfer coefficient and heat transfer area.
Specifically, the deviation-raising threshold value x= (minimum adjustable cooling capacity-solar radiation received by the transparent enclosure X solar heat gain coefficient)/(vehicle body enclosure heat transfer coefficient X heat transfer area).
If the variation value is greater than the deviation starting threshold, inputting the variation value into a temperature control model, and obtaining the frequency adjustment value comprises the following steps: acquiring historical operation data of a subway air conditioning unit within a preset time period; acquiring an outdoor temperature corresponding frequency calculation coefficient, an in-vehicle temperature correction coefficient and an outdoor temperature correction coefficient according to the historical operation data; and generating a temperature control model according to the frequency calculation coefficient corresponding to the outdoor temperature, the temperature correction coefficient in the vehicle and the outdoor temperature correction coefficient.
Specifically, according to the historical operation data, solar radiation, solar heat gain coefficient, vehicle body enclosing structure heat transfer coefficient and heat transfer area which are received by the transparent enclosing structure are obtained; and obtaining the frequency calculation coefficient corresponding to the outdoor temperature according to the solar radiation, the solar heat gain coefficient, the vehicle body enclosing structure heat transfer coefficient and the heat transfer area received by the transparent enclosing structure.
In this embodiment, the temperature control model is Δf 2 ＝A*(Te n -Te n-1 )*BT k *CT 0 . Wherein DeltaF 2 For the outdoor temperature frequency adjustment value, A is the frequency calculation coefficient corresponding to the outdoor temperature, te n Te is the current outdoor temperature n-1 For the outdoor temperature at the previous time point, BT k Outdoor temperature correction coefficient and CT 0 Is the temperature correction coefficient in the vehicle. Further, under different working condition temperatures, testing to obtain refrigeration capacity curves under different frequencies; and by collecting actual operation data, analyzing big data, and further correcting corresponding coefficient A, BT K 、CT 0 Values. Wherein a is an outdoor temperature corresponding frequency correction coefficient, and the essence is that the frequency of the compressor is increased/decreased by a, and the corresponding increased/decreased refrigerating capacity corresponds to the heat gain of the vehicle caused by the outdoor temperature. The value A is changed correspondingly according to different compressor types and different system designs, and is mainly obtained by testing the performance of the vehicle-mounted air conditioner to obtain initial data and analyzing and fitting. Further, according to the historical operation data, the frequency correction coefficient corresponding to the outdoor temperature is analyzed and corrected. In one embodiment, taking a 37kW passenger air conditioning unit of a B-type vehicle as an example, a 2-air conditioning unit of a car is taken as an example, and simple rough calculation is performed, wherein the refrigerating capacity is considered to change linearly with frequency, and under the rated working condition, that is, the refrigerating capacity adjusted every 1Hz is 37×2/48 (rated frequency) =1.5 kW, a= [ (solar radiation received by the transparent enclosure×solar heat gain coefficient)/Δte+vehicle body enclosure heat transfer coefficient×heat transfer area]/1.5.Δte is a change value of the outdoor temperature.
BT K Is an outdoor temperature correction coefficient, CT 0 The temperature correction coefficient is an in-vehicle temperature correction coefficient, and is characterized in that the refrigerating capacity of a unit can change according to the change of the outdoor temperature and the indoor temperature, and the outdoor temperature correction coefficient and the in-vehicle temperature correction coefficient are initially determined by comparing refrigerating capacity curves under different temperature working conditions. Further, the outdoor temperature correction coefficient and the in-vehicle temperature correction coefficient are analyzed and corrected according to the historical operation data.
According to historical operation data, through perfecting a preset frequency temperature control model, the adjustment of the refrigerating capacity of the air conditioning unit is closer to the actual load change condition, the heuristic stable stage of passively adjusting the frequency of the compressor according to the calculation of the room temperature fluctuation is greatly shortened, and the ideal state can eliminate the room temperature fluctuation stage, so that the carriage keeps comfortable and stable temperature for a long time.
Step S204, the frequency of the compressor of the air conditioning unit is adjusted to a frequency adjustment value.
Specifically, the compressor frequency of the air conditioning unit is adjusted according to the outdoor temperature frequency adjustment value. And calculating a frequency adjustment value which is needed to be made by the compressor according to the load change according to the temperature control model, and directly adjusting the frequency of the compressor to adapt to the load change or reducing the time for carrying out load matching on the frequency modulation of the compressor so as to keep the indoor temperature in the subway stable.
The step of adjusting the frequency of the compressor of the air conditioning unit according to the frequency adjustment value comprises the following steps: acquiring a temperature value of a sensor in a subway room and a return air temperature correction value; and obtaining an actual indoor temperature value according to the indoor sensor temperature value and the return air temperature correction value.
In one embodiment, the actual indoor temperature value calculation formula is: tin=tin+h. Wherein Tin is the temperature value of the subway indoor sensor, h is the return air temperature correction value, and Tin is the actual indoor temperature value. Further, the return air temperature sensors of the air conditioning unit are usually arranged at arch cover plates at two sides of a carriage to obtain the temperature value of the subway indoor sensor, the temperature value can be affected by the temperature of the outer surface of the carriage to a certain extent, and the + -return air temperature correction value h can be preset according to the difference between the temperature value of the subway indoor sensor obtained through actual detection and the actual indoor temperature value. Furthermore, by setting up a piecewise function, different return air temperature correction values h are preset according to the external temperature interval, analysis is performed according to the historical operation data, and more accurate return air temperature correction values h are generated through external temperature fitting, so that correction is performed.
Through the steps, the change of the load in the vehicle caused by the change of the outdoor temperature is adapted according to the frequency of the active preset variable-frequency compressor, the problem that the outdoor temperature fluctuates severely when entering and exiting the tunnel is solved, and the indoor temperature is kept at a comfortable temperature.
It should be noted that the steps illustrated in the above-described flow or flow diagrams of the figures may be performed in a computer system, such as a set of computer-executable instructions, and that, although a logical order is illustrated in the flow diagrams, in some cases, the steps illustrated or described may be performed in an order other than that illustrated herein.
The embodiment also provides a control device for the variable-frequency subway air conditioner unit, which is used for realizing the embodiment and the preferred implementation manner, and the description is omitted. As used below, the terms "module," "unit," "sub-unit," and the like may be a combination of software and/or hardware that implements a predetermined function. While the means described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.
Fig. 3 is a block diagram of a control device of a variable frequency subway air conditioning unit according to an embodiment of the present application, as shown in fig. 3, the device includes: a temperature acquisition module 310, a variation value acquisition module 320, a frequency calculation module 330, and a frequency adjustment module 340.
The temperature acquisition module 310 is configured to acquire an outdoor temperature outside the subway.
The change value obtaining module 320 is configured to obtain a change value of the outdoor temperature according to the outdoor temperature.
The frequency calculation module 330 is configured to input the variation value into a temperature control model to obtain a frequency adjustment value if the variation value is greater than a deviation starting threshold.
The frequency adjustment module 340 is configured to adjust the frequency of the compressor of the air conditioning unit according to the frequency adjustment value.
The frequency calculation module 330 is further configured to obtain subway structure parameters and minimum adjustable refrigerating capacity; obtaining a deviation starting threshold according to the subway structure parameters and the minimum adjustable refrigerating capacity; and if the change value is larger than the deviation starting threshold, inputting the change value into a temperature control model to obtain a frequency adjustment value.
The frequency calculation module 330 is further configured to obtain historical operation data of the subway air conditioning unit within a preset time period; acquiring an outdoor temperature corresponding frequency calculation coefficient, an in-vehicle temperature correction coefficient and an outdoor temperature correction coefficient according to the historical operation data; and generating a temperature control model according to the frequency calculation coefficient corresponding to the outdoor temperature, the temperature correction coefficient in the vehicle and the outdoor temperature correction coefficient.
The frequency calculation module 330 is further configured to obtain solar radiation, solar heat gain coefficient, heat transfer coefficient of the vehicle body enclosure structure and heat transfer area received by the transparent enclosure structure according to the historical operation data; and obtaining the frequency calculation coefficient corresponding to the outdoor temperature according to the solar radiation, the solar heat gain coefficient, the vehicle body enclosing structure heat transfer coefficient and the heat transfer area received by the transparent enclosing structure.
The frequency calculation module 330 is further configured to calculate the temperature control model as Δf 2 ＝A*(Te n -Te n-1 )*BT k *CT 0 。
The frequency adjustment module 340 is further configured to obtain a temperature value of the sensor in the subway room and a return air temperature correction value; and obtaining an actual indoor temperature value according to the indoor sensor temperature value and the return air temperature correction value.
The above-described respective modules may be functional modules or program modules, and may be implemented by software or hardware. For modules implemented in hardware, the various modules described above may be located in the same processor; or the above modules may be located in different processors in any combination.
In addition, the control method of the variable frequency subway air conditioner set, which is described in connection with fig. 1, can be realized by variable frequency subway air conditioner set control equipment. Fig. 4 is a schematic hardware structure diagram of a variable frequency subway air conditioning unit control device according to an embodiment of the application.
The variable frequency subway air conditioning unit control apparatus may include a processor 41 and a memory 42 storing computer program instructions.
In particular, the processor 41 may comprise a Central Processing Unit (CPU), or an application specific integrated circuit (Application Specific Integrated Circuit, abbreviated as ASIC), or may be configured as one or more integrated circuits that implement embodiments of the present application.
Memory 42 may include, among other things, mass storage for data or instructions. By way of example, and not limitation, memory 42 may comprise a Hard Disk Drive (HDD), floppy Disk Drive, solid state Drive (Solid State Drive, SSD), flash memory, optical Disk, magneto-optical Disk, tape, or universal serial bus (Universal Serial Bus, USB) Drive, or a combination of two or more of the foregoing. The memory 42 may include removable or non-removable (or fixed) media, where appropriate. The memory 42 may be internal or external to the data processing apparatus, where appropriate. In a particular embodiment, the memory 42 is a Non-Volatile (Non-Volatile) memory. In a particular embodiment, the Memory 42 includes Read-Only Memory (ROM) and random access Memory (Random Access Memory, RAM). Where appropriate, the ROM may be a mask-programmed ROM, a programmable ROM (PROM for short), an erasable PROM (Erasable Programmable Read-Only Memory for short), an electrically erasable PROM (Electrically Erasable Programmable Read-Only Memory for short EEPROM), an electrically rewritable ROM (Electrically Alterable Read-Only Memory for short EAROM) or a FLASH Memory (FLASH) or a combination of two or more of these. The RAM may be Static Random-Access Memory (SRAM) or dynamic Random-Access Memory (Dynamic Random Access Memory DRAM), where the DRAM may be a fast page mode dynamic Random-Access Memory (Fast Page Mode Dynamic Random Access Memory FPMDRAM), extended data output dynamic Random-Access Memory (Extended Date Out Dynamic Random Access Memory EDODRAM), synchronous dynamic Random-Access Memory (Synchronous Dynamic Random-Access Memory SDRAM), or the like, as appropriate.
Memory 42 may be used to store or cache various data files that need to be processed and/or communicated, as well as possible computer program instructions for execution by processor 41.
The processor 41 reads and executes the computer program instructions stored in the memory 42 to implement any one of the variable frequency subway air conditioning unit control methods of the above embodiments.
In some of these embodiments, the variable frequency subway air conditioning unit control apparatus may further include a communication interface 43 and a bus 40. As shown in fig. 4, the processor 41, the memory 42, and the communication interface 43 are connected to each other through the bus 40 and perform communication with each other.
The communication interface 43 is used to enable communication between modules, devices, units and/or units in embodiments of the application. Communication port 43 may also enable communication with other components such as: and the external equipment, the image/data acquisition equipment, the database, the external storage, the image/data processing workstation and the like are used for data communication.
Bus 40 includes hardware, software, or both, that couple the components of the variable frequency subway air conditioning unit control apparatus to one another. Bus 40 includes, but is not limited to, at least one of: data Bus (Data Bus), address Bus (Address Bus), control Bus (Control Bus), expansion Bus (Expansion Bus), local Bus (Local Bus). By way of example, and not limitation, bus 40 may include a graphics acceleration interface (Accelerated Graphics Port), AGP or other graphics Bus, an enhanced industry standard architecture (Extended Industry Standard Architecture), EISA) Bus, front Side Bus (FSB), hyperTransport (HT) interconnect, industry standard architecture (Industry Standard Architecture), ISA) Bus, infiniBand (InfiniBand) interconnect, low Pin Count (LPC) Bus, memory Bus, micro channel architecture (Micro Channel Architecture), MCA Bus, peripheral component interconnect (Peripheral Component Interconnect), PCI-Express (PCI-X) Bus, serial advanced technology attachment (Serial Advanced Technology Attachment, SATA) Bus, video electronics standards association local (Video Electronics Standards Association Local Bus, VLB) Bus, or other suitable Bus, or a combination of two or more of these. Bus 40 may include one or more buses, where appropriate. Although embodiments of the application have been described and illustrated with respect to a particular bus, the application contemplates any suitable bus or interconnect.
The control device of the variable frequency subway air conditioning unit can execute the control method of the variable frequency subway air conditioning unit based on the obtained outdoor temperature, thereby realizing the control method of the variable frequency subway air conditioning unit described in connection with fig. 1.
In addition, in combination with the control method of the variable frequency subway air conditioning unit in the embodiment, the embodiment of the application can be realized by providing a computer readable storage medium. The computer readable storage medium has stored thereon computer program instructions; the computer program instructions, when executed by the processor, implement any one of the variable frequency subway air conditioning unit control methods in the above embodiments.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (8)
1. The control method of the variable-frequency subway air conditioning unit is characterized by comprising the following steps of:
acquiring outdoor temperature outside the subway at preset time intervals;
obtaining a change value of the outdoor temperature according to the current outdoor temperature and the outdoor temperature at the previous time point;
if the change value is larger than the deviation starting threshold, inputting the change value into a temperature control model to obtain a frequency adjustment value;
the temperature control model is generated according to the frequency calculation coefficient corresponding to the outdoor temperature, the temperature correction coefficient in the vehicle and the outdoor temperature correction coefficient; the temperature control model is Δf2=a (Ten-1) BTk ×ct0, Δf2 is the frequency adjustment value, a is the frequency calculation coefficient corresponding to the outdoor temperature, ten is the current outdoor temperature, ten-1 is the outdoor temperature at the previous time point, BTk is the outdoor temperature correction coefficient, and CT0 is the in-vehicle temperature correction coefficient; the outdoor temperature corresponding frequency calculation coefficient is obtained according to solar radiation received by the transparent enclosing structure, the solar heat gain coefficient, the heat transfer coefficient of the vehicle body enclosing structure and the heat transfer area; the temperature correction coefficient in the vehicle and the outdoor temperature correction coefficient are obtained according to historical operation data;
and according to the frequency adjustment value, adjusting the frequency of the compressor of the air conditioning unit.
2. The method according to claim 1, wherein if the change value is greater than a deviation starting threshold, inputting the change value into a temperature control model, and obtaining the frequency adjustment value comprises:
obtaining subway structure parameters and minimum adjustable refrigerating capacity;
obtaining a deviation starting threshold according to the subway structure parameters and the minimum adjustable refrigerating capacity;
and if the change value is larger than the deviation starting threshold, inputting the change value into a temperature control model to obtain a frequency adjustment value.
3. The method for controlling a variable frequency subway air conditioning unit according to claim 2, wherein the subway structure parameters include: solar radiation received by the transparent enclosure, solar heat gain coefficient, vehicle body enclosure heat transfer coefficient and heat transfer area.
4. The method according to claim 1, wherein if the change value is greater than a deviation starting threshold, inputting the change value into a temperature control model, and obtaining the frequency adjustment value comprises:
acquiring historical operation data of a subway air conditioning unit within a preset time period;
and acquiring solar radiation, solar heat gain coefficient, vehicle body enclosing structure heat transfer coefficient and heat transfer area received by the transparent enclosing structure according to the historical operation data.
5. The method for controlling a variable frequency metro air conditioning unit as claimed in claim 1, wherein the frequency adjusting the compressor of the air conditioning unit according to the frequency adjustment value comprises:
acquiring a temperature value of a sensor in a subway room and a return air temperature correction value;
and obtaining an actual indoor temperature value according to the indoor sensor temperature value and the return air temperature correction value.
6. The utility model provides a frequency conversion subway air conditioning unit controlling means which characterized in that includes:
the temperature acquisition module is used for acquiring outdoor temperature outside the subway;
the change value acquisition module is used for acquiring a change value of the outdoor temperature according to the outdoor temperature;
the frequency calculation module is used for inputting the change value into the temperature control model to obtain a frequency adjustment value if the change value is larger than the deviation starting threshold value; the temperature control model is generated according to the frequency calculation coefficient corresponding to the outdoor temperature, the temperature correction coefficient in the vehicle and the outdoor temperature correction coefficient; the temperature control model is Δf2=a (Ten-1) BTk ×ct0, Δf2 is the frequency adjustment value, a is the frequency calculation coefficient corresponding to the outdoor temperature, ten is the current outdoor temperature, ten-1 is the outdoor temperature at the previous time point, BTk is the outdoor temperature correction coefficient, and CT0 is the in-vehicle temperature correction coefficient; the outdoor temperature corresponding frequency calculation coefficient is obtained according to solar radiation received by the transparent enclosing structure, the solar heat gain coefficient, the heat transfer coefficient of the vehicle body enclosing structure and the heat transfer area; the temperature correction coefficient in the vehicle and the outdoor temperature correction coefficient are obtained according to historical operation data;
and the frequency adjusting module is used for adjusting the frequency of the compressor of the air conditioning unit according to the frequency adjusting value.
7. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the variable frequency subway air conditioning unit control method according to any one of claims 1 to 5 when executing the computer program.
8. A computer-readable storage medium, on which a computer program is stored, characterized in that the program, when executed by a processor, implements the variable frequency subway air conditioning unit control method according to any one of claims 1 to 5.
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