CN115930498B - Compressor frequency control method and device and variable frequency air conditioner - Google Patents
Compressor frequency control method and device and variable frequency air conditioner Download PDFInfo
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Abstract
The invention provides a compressor frequency control method, a compressor frequency control device and a variable frequency air conditioner; wherein the method comprises the following steps: when the first difference between the return air temperature and the user set temperature is smaller than a preset first threshold, the room cooling load of the room where the variable frequency air conditioner is located is calculated according to the calculated parameter and the return air temperature at the current moment, the room cooling load is used as the cooling capacity required to be output by the variable frequency air conditioner, the corresponding preset frequency is calculated, when the operation duration of the compressor according to the preset frequency reaches the preset duration, the preset frequency is corrected according to the second difference between the return air temperature and the user set temperature, the correction between the preset frequency correction value and the preset frequency is calculated, and in each period of continuous operation, the target frequency corresponding to the period is obtained according to the preset frequency and the correction, so that the compressor is controlled to operate according to the corresponding target frequency in the period, the temperature in the room can be quickly stabilized, and the comfort level of the user is improved.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a compressor frequency control method and device and a variable frequency air conditioner.
Background
At present, the existing air conditioner is mainly controlled by adopting a frequency conversion system, namely, at the beginning of the starting of the air conditioner, a compressor runs at a higher frequency so as to quickly reduce/increase the room temperature, and when the indoor temperature approaches to a user-set expected value, the compressor gradually reduces the frequency; and when the indoor temperature reaches a user-set expected value, the frequency of the compressor operates in a fluctuating state so that the temperature in the room tends to be in a relatively stable state.
When the temperature of the room is kept relatively stable, the prior variable frequency air conditioner mainly reduces/increases the operation frequency of the compressor according to the monitored return air temperature so as to control the refrigerating capacity provided for the room; in the control process, the variable frequency air conditioner judges that the used data is the return air temperature data collected in real time, and after the variable frequency air conditioner is started, the variable frequency air conditioner usually operates at the maximum frequency until the room temperature is close to a user set expected value, if the circulation of the ambient air in the air conditioner is poor, the return air temperature detected by the air conditioner is lagged, the control action is not rapid, so that the indoor temperature cannot directly reach the user set expected value, even can be lower than the user set expected value, and then rises back to be higher than the user set expected value, namely, the periodical change is displayed, so that the frequency control precision of the variable frequency air conditioner is reduced, and the comfort of a user is further influenced.
Disclosure of Invention
Accordingly, the invention aims to provide a compressor frequency control method and device and a variable frequency air conditioner, so as to alleviate the technical problems, realize rapid stabilization of the temperature in a room, reduce temperature fluctuation and improve user comfort.
In a first aspect, an embodiment of the present invention provides a compressor frequency control method, including: when the variable frequency air conditioner is started to operate, controlling the compressor to operate according to an initial target frequency, and acquiring a return air temperature and a user set temperature; calculating a first difference between the return air temperature and the user set temperature, and adjusting the frequency of the compressor according to the first difference until the first difference is smaller than a preset first threshold; acquiring calculation parameters, and calculating the room cooling load of the room where the variable-frequency air conditioner is located according to the calculation parameters and the return air temperature at the current moment; wherein, the calculation parameters include: latitude and longitude position information corresponding to a room, outdoor air temperature at the current moment, room area parameters and calculation coefficients; taking the room cooling load as the cooling capacity required to be output by the variable frequency air conditioner, and calculating to obtain a corresponding preset frequency; controlling the compressor to run according to the preset frequency, and calculating a second difference value between the return air temperature and the user set temperature when the running time reaches the preset time; if the second difference value does not meet the balance condition, correcting the preset frequency until the second difference value meets the balance condition, and calculating a correction value between the preset frequency correction value and the preset frequency; controlling the compressor to operate according to the preset frequency correction value, and periodically acquiring calculation parameters according to preset intervals; and in each period, calculating the corresponding room cooling load and the preset frequency according to the calculated parameters, obtaining the target frequency corresponding to the period according to the preset frequency and the correction quantity, and controlling the compressor to run in the period according to the corresponding target frequency.
According to the compressor frequency control method, the room cooling load and the corresponding preset frequency are calculated to control the compressor to run according to the preset frequency, and the preset frequency is corrected through the return air temperature, so that the temperature in the room can be quickly stabilized, the temperature fluctuation is reduced, the comfort experience degree of a user is improved, the frequency of the lifting frequency of the compressor is reduced, and the service life of the compressor is prolonged.
Preferably, the balance condition includes a preset second threshold value and a preset third threshold value; and the preset third threshold value is more than 0 and less than the preset second threshold value; if the second difference does not meet the balance condition, the method further includes: if the second difference value is a positive value, judging whether the second difference value is not smaller than a preset second threshold value or not; if so, it is determined that the second difference does not satisfy the balance condition.
Preferably, before the step of if the second difference does not meet the balance condition, the method further includes: if the second difference value is a negative value, judging whether the second difference value is not greater than a preset third threshold value; if so, it is determined that the second difference does not satisfy the balance condition.
Preferably, the step of correcting the preset frequency until the second difference value meets the balance condition includes: and carrying out improvement correction on the preset frequency until the second difference value is smaller than a preset second threshold value.
Preferably, the step of correcting the preset frequency until the second difference value meets the balance condition further includes: and reducing and correcting the preset frequency until the second difference value is larger than a preset third threshold value.
Preferably, the step of calculating the room cooling load of the room where the variable frequency air conditioner is located according to the calculated parameter and the return air temperature at the current moment includes: calculating according to the calculation parameters and the return air temperature at the current moment to obtain the cooling load of the enclosure structure; acquiring a preset heat dissipation value, and calculating to obtain a room cooling load according to the enclosure cooling load and the preset heat dissipation value; wherein, preset heat dissipation value includes: human body heat dissipation value, lamplight heat dissipation value and equipment heat dissipation value.
Preferably, the method further comprises: acquiring the outdoor environment temperature of the variable frequency air conditioner when the variable frequency air conditioner is started; an initial target frequency is determined based on the outdoor ambient temperature.
In a second aspect, an embodiment of the present invention further provides a compressor frequency control apparatus, including: the first acquisition module is used for controlling the compressor to operate according to the initial target frequency when the variable frequency air conditioner is started to operate, and acquiring the return air temperature and the user set temperature; the first calculation module is used for calculating a first difference value between the return air temperature and the user-set temperature, and adjusting the frequency of the compressor according to the first difference value until the first difference value is smaller than a preset first threshold value; the second acquisition module is used for acquiring the calculation parameters and calculating the room cooling load of the room where the variable-frequency air conditioner is located according to the calculation parameters and the return air temperature at the current moment; wherein, the calculation parameters include: latitude and longitude position information corresponding to a room, outdoor air temperature at the current moment, room area parameters and calculation coefficients; the second calculation module is used for taking the room cooling load as the cooling capacity required to be output by the variable frequency air conditioner and calculating to obtain corresponding preset frequency; the third calculation module is used for controlling the compressor to run according to the preset frequency, and calculating a second difference value between the return air temperature and the user-set temperature when the running time reaches the preset time; the frequency correction module is used for correcting the preset frequency if the second difference value does not meet the balance condition until the second difference value meets the balance condition, and calculating the correction quantity between the preset frequency correction value and the preset frequency; the period control module is used for controlling the compressor to operate according to the preset frequency correction value and periodically acquiring calculation parameters according to preset intervals; and in each period, calculating the corresponding room cooling load and the preset frequency according to the calculated parameters, obtaining the target frequency corresponding to the period according to the preset frequency and the correction quantity, and controlling the compressor to run in the period according to the corresponding target frequency.
In a third aspect, an embodiment of the present invention further provides a variable frequency air conditioner, 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 steps of the method of the first aspect when executing the computer program.
In a fourth aspect, embodiments of the present invention also provide a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method of the first aspect described above.
The embodiment of the invention has the following beneficial effects:
The embodiment of the invention provides a compressor frequency control method and device and a variable frequency air conditioner, wherein in the operation process of the variable frequency air conditioner, the frequency of a compressor is adjusted according to return air temperature and user set temperature until a first difference value is smaller than a preset first threshold value, namely the return air temperature is close to the user set temperature; at this time, the cooling load of the room and the corresponding preset frequency are calculated to control the compressor to run according to the preset frequency, and the preset frequency is corrected through the return air temperature, so that the temperature in the room can be quickly stabilized, the temperature fluctuation is reduced, the comfort experience degree of a user is improved, the frequency of the lifting frequency of the compressor is reduced, and the service life of the compressor is prolonged.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a compressor frequency control method provided by an embodiment of the present invention;
FIG. 2 is a schematic diagram of a compressor frequency control according to an embodiment of the present invention;
FIG. 3 is a flow chart of another compressor frequency control method provided by an embodiment of the present invention;
FIG. 4 is a schematic diagram of a compressor frequency control device according to an embodiment of the present invention;
Fig. 5 is a schematic structural diagram of a variable frequency air conditioner according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order to facilitate understanding of the present embodiment, the following describes embodiments of the present invention in detail.
The embodiment of the invention provides a compressor frequency control method, wherein an execution main body is a controller of a variable-frequency air conditioner or a control terminal in communication connection with the controller. As shown in fig. 1, the method comprises the steps of:
Step S102, when the variable frequency air conditioner is started to operate, controlling the compressor to operate according to an initial target frequency, and acquiring a return air temperature and a user set temperature;
specifically, when the variable frequency air conditioner is started to operate, a user can set a user set temperature Ts through an air conditioner remote controller or a control panel which is in communication connection with the controller, wherein the user set temperature Ts is also called a user set expected value; meanwhile, a temperature sensor such as a temperature sensing bag is further arranged at the air return port of the variable-frequency air conditioner so as to detect the air return temperature, namely the conventional indoor temperature, and therefore the frequency of the compressor can be better adjusted according to the detected air return temperature. It should be noted that, the above-mentioned return air temperature may be obtained in real time, or may be obtained at preset intervals, and may be specifically set according to actual situations.
In addition, the initial target frequency is also corresponding to the starting time of the compressor, and the method further comprises the following steps: acquiring an outdoor environment temperature T outer ring when the variable frequency air conditioner is started; the initial target frequency is determined according to the outdoor ambient temperature T outer ring . Specifically, the corresponding initial target frequency may be determined according to the range in which the outdoor ambient temperature T outer ring is located; the corresponding initial target frequency F 0 may also be determined according to the outdoor ambient temperature T outer ring and a preset relational expression, and may specifically be set according to the actual situation.
Wherein, for the case of the preset relation, the preset relation is preferably a piecewise function, as shown in the following formula:
For example, when the outdoor ambient temperature T outer ring is 10 ℃, the corresponding initial target frequency F 0 is 22Hz; when the outdoor environment temperature T outer ring is between 33 ℃ and 38 ℃, the corresponding initial target frequency F 0 is 72Hz; therefore, the corresponding initial target frequency F 0 is determined according to the outdoor environment temperature T outer ring , so that after the compressor is started to run, the refrigerating/heating can be quickly performed, the return air temperature is quickly close to the user set temperature Ts, and the comfort experience of the user is ensured.
Step S104, calculating a first difference value between the return air temperature and the user set temperature, and adjusting the frequency of the compressor according to the first difference value until the first difference value is smaller than a preset first threshold value;
Specifically, a first difference Δt1 between the return air temperature T Returning to and the user set temperature Ts is calculated, and the frequency of the compressor is adjusted according to the first difference Δt1, so that the first difference Δt1 gradually decreases until the first difference is smaller than a preset first threshold, i.e., Δt1 < T1, at which time the return air temperature T Returning to is represented to be close to the user set temperature Ts. It should be noted that, considering the cooling/heating operation of the variable frequency air conditioner, the Δt1 may be an absolute value of the first difference, and when cooling, the first difference is a positive value, and the frequency of the compressor is increased until Δt1 is less than T1 on the basis of the initial target frequency; when the variable frequency air conditioner heats, the first difference value is a negative value, and on the basis of the initial target frequency, the frequency of the compressor is reduced until delta T1 (absolute value is smaller than T1); and, the first threshold T1 is only used to represent that the return air temperature T Returning to is close to the user set temperature Ts, and may be preferably 1 ℃, and may be specifically set according to practical situations.
Step S106, obtaining calculation parameters, and calculating the room cooling load of the room where the variable frequency air conditioner is located according to the calculation parameters and the return air temperature at the current moment;
The variable frequency air conditioner further comprises a communication module, such as a GPS (Global Positioning System ) module, which is in communication connection with the controller and is used for communicating with an external control terminal so as to acquire the calculation parameters sent by the control terminal. Wherein, the calculation parameters include: latitude and longitude position information corresponding to a room, outdoor air temperature at the current moment, room area parameters and calculation coefficients; the longitude and latitude information is city longitude and latitude position information of the place where the variable-frequency air conditioner is located, and the outdoor air temperature at the current moment is the outdoor air temperature detected by the meteorological department of the place where the variable-frequency air conditioner is located; room area parameters include, but are not limited to: the surface area of the outer wall of the room, the effective area coefficient and the window area of the room; the calculation coefficients include, but are not limited to, reinforced concrete heat transfer coefficients, solar radiation absorption coefficients of the outer surface of the building envelope, solar radiation illuminance average values, heat exchange coefficients of the outer surface of the building envelope, effective area coefficients, sunshade coefficients of window glass, sunshade coefficients of sunshade facilities in the window, solar heat gain factors determined according to longitude and latitude positions, window glass cold load coefficients and the like, and can be specifically set according to practical situations.
Specifically, firstly, calculating according to calculation parameters and the return air temperature at the current moment to obtain the cooling load of the enclosure structure; then, a preset heat dissipation value is obtained, and a room cooling load is obtained through calculation according to the enclosure cooling load and the preset heat dissipation value; wherein, preset heat dissipation value includes: human body heat dissipation value, lamplight heat dissipation value and equipment heat dissipation value.
In practical application, the maintenance structure corresponding to the cold load of the enclosure mainly comprises a conventional reinforced concrete brick wall, a door, an inner sunshade common flat glass window, a western sun-free/roof and the like, so that the cold load of the enclosure mainly comprises the cold load of a maintenance wall body and the cold load of a glass window, and the cold load of the enclosure can be calculated according to the following formula:
Q1＝Q11+Q12 (2)
Wherein, Q 1 represents the building envelope cooling load, Q 11 represents the maintenance wall cooling load, and Q 12 represents the glazing cooling load.
Wherein, the maintenance wall cooling load Q 11 can be calculated according to the following formula:
Wherein Q 11 represents the cold load of a maintenance wall, T Empty space represents the outdoor air temperature at the current moment, T Returning to represents the return air temperature at the current moment, A represents the surface area of the outer wall of a room, K represents the heat transfer coefficient of conventional reinforced concrete, ρ represents the solar radiation absorption coefficient of the outer surface of the enclosure structure, and 0.9 is taken; j represents the average value of solar radiation illuminance, and the average value of the current region is taken; alpha represents the heat exchange coefficient of the outer surface of the enclosure structure and the heat exchange coefficient of cement mortar. It should be noted that, the values of K, ρ, J and α in the formula (3) may be stored in the controller in advance, so as to be directly obtained in the subsequent calculation.
Glazing cooling load Q 12 can be calculated according to the following formula:
Q12＝CαBCuCiDjmaxCLQ (4)
Wherein Q 12 represents the glass window cooling load, C α represents the effective area coefficient, and 0.85 is taken according to a single-layer steel window; b represents the window area, i.e. the area of a local conventional residential window; c u represents the shading coefficient of the window glass, and the standard glass is taken as 1; c i represents the sunshade coefficient of a sunshade facility in the window, and the white cloth curtain is taken to be 0.5; d jmax represents the solar heat gain factor, the solar heat gain factor of the local area is taken, and the solar heat gain factor is determined according to longitude and latitude information; c LQ represents a window glass cooling load factor, and is determined by the current regional latitude and the current time. It should be noted that, each parameter in the above formula (4) may be obtained by recalculating the parameter, or some parameters may be stored in the controller in advance, and may be specifically set according to the actual situation.
Therefore, the room cooling load may also be referred to as a time-by-time cooling load required by a room, and is generally calculated according to a conventional residential room, and in combination with a practical use scenario of the variable frequency air conditioner for home, besides the above-mentioned maintenance structure cooling load Q 1, the room cooling load may also be calculated according to the following formula:
Q＝Q1+Q2+Q3+Q4 (5)
Wherein, Q represents room cooling load, Q 1 represents building enclosure cooling load, which can be calculated according to the acquired longitude and latitude position information and the return air temperature at the corresponding moment, Q 2 represents human body heat dissipation value, and the personnel density is extremely low and is approximately 0 in the household situation; q 3 represents the heat dissipation value of lamplight illumination, and the actual heat dissipation value of the incandescent lamp in an air-conditioning room is usually taken, wherein the incandescent lamp is continuously turned on for 4 hours; q 4 represents the heat dissipation value of the equipment, typically 1 desktop computer, and the actual heat dissipation value for 4 hours of continuous use in normal home use. It should be noted that, Q 2、Q3 and Q 4 are obtained by calculating average values of a simulated conventional civil room, and may be stored in the controller in advance, or stored in the control terminal, and sent to the controller through the communication module, so as to be used for calculating the cooling load of the room.
Step S108, taking the room cooling load as the cooling capacity required to be output by the variable frequency air conditioner, and calculating to obtain a corresponding preset frequency;
Specifically, after the room cooling load when the return air temperature is close to the set temperature of the user is obtained through the calculation, the calculated room cooling load is used as the cooling capacity required to be output by the variable frequency air conditioner, and the corresponding frequency, namely the preset frequency, is obtained through calculation. Since the unit of the room cooling load Q is W and is identical to the unit of the cooling capacity, the calculated room cooling load can be used as the cooling capacity required to be output by the variable frequency air conditioner to calculate the corresponding air conditioning frequency. In practical application, because of the difference of specific configurations of the variable frequency air conditioner, the variable frequency air conditioner can be calculated by adopting a simple estimation mode in combination with experimental experience data, such as different air conditioning frequencies corresponding to the common household air conditioner with 2600W refrigerating capacity and the air conditioner with 3500W refrigerating capacity, therefore, the corresponding relation between the refrigerating capacity and the frequency can be pre-selected and stored in the controller or the control terminal, and the corresponding frequency, namely the preset frequency, can be calculated according to the calculated room cooling load and the corresponding relation.
Step S110, controlling the compressor to operate according to a preset frequency, and calculating a second difference between the return air temperature and the user set temperature when the operation time reaches the preset time;
After the preset frequency corresponding to the room cooling load is calculated, the compressor is controlled to operate according to the preset frequency, and when the operation duration reaches the preset duration, the variable frequency air conditioner is operated stably at this time, that is, the variation value of the temperature value detected by each temperature sensing bulb in the variable frequency air conditioner within 1min is smaller than 1 ℃, the preset duration is preferably 10min, and a second difference delta T2 between the return air temperature T Returning to and the user set temperature Ts at this time is calculated. It should be noted that, the second difference Δt2 and the first difference Δt1 are only used for the difference between the return air temperature T Returning to and the user set temperature Ts in different operation states, the first difference Δt1 is used for characterizing the difference when the initial adjustment return air temperature T Returning to of the compressor approaches the user set temperature Ts, and the second difference Δt2 is used for the difference between the return air temperature T Returning to and the user set temperature Ts in the preset frequency correction.
Step S112, if the second difference value does not meet the balance condition, correcting the preset frequency until the second difference value meets the balance condition, and calculating a correction value between the preset frequency correction value and the preset frequency;
Because the actual housing environment and the building enclosure parameters of residents have deviation from the calculated settings, when the compressor operates according to the preset frequency and the variable frequency air conditioner reaches a stable state, whether the second difference value delta T2 meets the balance condition is also needed to be judged. Wherein, the balance condition comprises a preset second threshold T2 and a preset third threshold T3; and the third threshold T3 is smaller than 0 and smaller than the second threshold T2; since the return air temperature T Returning to is close to the user set temperature Ts at this time, the second difference Δt2 may be a positive value at this time, i.e. the return air temperature T Returning to is higher than the user set temperature Ts; it may also be negative, i.e. the return air temperature T Returning to is lower than the user set temperature Ts.
Therefore, if the second difference Δt2 is a positive value, determining whether the second difference Δt2 is not less than the preset second threshold T2; if so, it is determined that the second difference ΔT2 does not satisfy the balance condition. At this time, the preset frequency is improved and corrected until the second difference Δt2 is smaller than the preset second threshold T2. The preset second threshold T2 is preferably 0.5 ℃, and when the return air temperature T Returning to is 0.5 ℃ higher than the user set temperature Ts, the frequency of the compressor is increased so that the second difference Δt2 between the return air temperature T Returning to and the user set temperature Ts is less than 0.5 ℃.
Similarly, if the second difference Δt2 is a negative value, judging whether the second difference Δt2 is not greater than a preset third threshold T3; if so, it is determined that the second difference ΔT2 does not satisfy the balance condition. At this time, the preset frequency is reduced and corrected until the second difference Δt2 is greater than the preset third threshold T3. The preset second threshold T3 is preferably-0.5 ℃, and when the return air temperature T Returning to is lower than the user set temperature Ts by 0.5 ℃, the frequency of the compressor is reduced, so that the second difference Δt2 between the return air temperature T Returning to and the user set temperature Ts is greater than-0.5 ℃.
In summary, by detecting the return air temperature T Returning to when the compressor operates according to the preset frequency and correcting the preset frequency according to the second difference Δt2 between the return air temperature T Returning to and the user set temperature Ts, the accuracy of the compressor frequency control is improved. Meanwhile, the preset frequency correction value when the balance condition is met is recorded, the correction quantity delta F between the preset frequency correction value and the preset frequency is calculated, and the corrected running state parameter reaching the stable state is used as a new preset value record to be stored, so that the running state parameter can be directly called later.
Step S114, controlling the compressor to operate according to the preset frequency correction value, and periodically acquiring calculation parameters according to preset intervals; and in each period, calculating the corresponding room cooling load and the preset frequency according to the calculated parameters, obtaining the target frequency corresponding to the period according to the preset frequency and the correction quantity, and controlling the compressor to run in the period according to the corresponding target frequency.
Specifically, after the preset frequency correction value is obtained, the compressor is controlled to operate according to the preset frequency correction value, and after time passes, part of the calculated parameters change, for example, the outdoor air temperature is different in each period, so that the room cooling load changes, and the output cooling capacity required by the variable-frequency air conditioner in different periods also changes (increases/decreases), so that the pre-adjustment is also required according to the local air temperature. In the follow-up operation of the variable frequency air conditioner according to the preset frequency correction value, acquiring calculation parameters in each period, such as each time period, and calculating the corresponding room cooling load and preset frequency; as shown in fig. 2, the target frequency corresponding to the period is obtained according to the preset frequency and the correction amount Δf, and the compressor is controlled to operate according to the corresponding target frequency in the period, so that the frequency of frequency raising and lowering of the compressor is reduced, temperature fluctuation is reduced, the temperature in a room is quickly stabilized, and the comfort experience of a user is improved.
It should be noted that, because the time of each start of the variable frequency air conditioner may be different, the first calculated room cooling load may be different when each start-up operation is performed, and the first correction amount Δf between the preset frequency correction value and the preset frequency may be different when each operation mode is performed, in this embodiment of the present invention, the correction amount Δf needs to be calculated according to the preset frequency corresponding to the first calculated room cooling load when each start-up operation is performed, and the correction amount Δf is used in the subsequent periodic control, that is, the preset frequency in each period in the subsequent operation is corrected according to the correction amount Δf, so as to reduce the frequency of lifting of the compressor, and quickly realize stable room temperature.
In summary, according to the compressor frequency control method provided by the embodiment of the invention, when the variable-frequency air conditioner is in operation, the compressor rapidly refrigerates/heats at a higher initial target frequency, the frequency changes along with the gradual decrease/increase of the return air temperature, when the return air temperature approaches to the user set temperature, the calculation parameters are obtained, and the room cooling load and the corresponding preset frequency are calculated through the calculation parameters; when the control compressor is operated according to the calculated preset frequency, the operation frequency of the compressor, namely the preset frequency, is regulated by auxiliary correction through collecting the return air temperature, so that the purpose of regulating the frequency of the compressor to control the indoor temperature is achieved; meanwhile, the corrected system state parameters are recorded so as to conveniently judge similar operation conditions, and the system can be operated according to the corresponding parameters; and in each period of the subsequent operation, correcting the preset frequency of the drink in each period according to the correction quantity, thereby reducing the frequency of the lifting of the compressor and prolonging the service life of the compressor; the fluctuation range of the room temperature can be reduced, the temperature in the room can be quickly stabilized, and the user comfort experience is improved.
For ease of understanding, this is illustrated herein. As shown in fig. 3, the method for controlling the frequency of the compressor provided by the embodiment of the invention further includes the following steps:
step S302, starting up a variable frequency air conditioner, and acquiring a user set temperature;
Step S304, determining an initial target frequency according to the outdoor environment temperature, and normally operating the compressor according to the determined initial target frequency;
step S306, collecting return air temperature, and adjusting the frequency of the compressor according to the difference value between the return air temperature and the user-set temperature;
step S308, obtaining calculation parameters to calculate the room cooling load and the preset frequency and the preset fan rotating speed of the compressor required by the room cooling load;
step S310, when the return air temperature is close to the set temperature of a user, controlling the compressor to operate according to a preset frequency, wherein the rotating speed of the fan is the rotating speed of the preset fan;
step S312, after the variable frequency air conditioner operates for 10min, detecting whether the difference value delta T between the return air temperature and the user set temperature meets delta T & gt0.5 ℃ or delta T & lt-0.5 ℃;
Step S314, if the delta T is more than 0.5 ℃, correcting the preset frequency to increase so as to increase the output cooling capacity until the delta T is less than 0.5 ℃; or if DeltaT is less than-0.5 ℃, correcting the preset frequency to reduce the output cold quantity until DeltaT is less than-0.5 ℃, and recording the correction quantity DeltaF;
Assume that: after calculation, the frequency of the compressor is regulated to be 60Hz to be a preset frequency; after the variable frequency air conditioner operates stably (taking the moment of the temperature point of each temperature sensing bulb of the system with the change value less than 1 ℃ in 1min as the operation stable starting moment of the variable frequency air conditioner), detecting that the return air temperature is 27 ℃, which is 1 ℃ higher than the 26 ℃ set by a user, at the moment, the cooling capacity generated by the operation according to the preset frequency of 60Hz is not enough to maintain the cooling load generated by the whole room, the output cooling capacity of the variable frequency air conditioner needs to be increased, the frequency of the compressor is increased by 60Hz to 62Hz, after the variable frequency air conditioner operates stably, detecting that the return air temperature is 26.3 ℃ and the difference value between the temperature and the 26 ℃ set by the user is 0.3 ℃, and judging that the cooling load and the cooling capacity in the room reach dynamic balance, and maintaining the compressor to operate according to the preset frequency correction value of 62 Hz; and the (new) preset frequency for this similar condition is recorded at 62Hz and the correction Δf is calculated to be 2Hz.
Step S316, when the variable frequency air conditioner continuously operates, acquiring calculation parameters of the next period, and calculating corresponding room cooling load and preset frequency; and obtaining the target frequency of the next time period according to the preset frequency of the next time period and the correction quantity delta F, and controlling the compressor to run according to the target frequency in the next time period.
It should be noted that, in addition to periodically acquiring the calculation parameters at preset intervals, when the outdoor air temperature changes, the calculation parameters may be acquired again, and the compressor may be adjusted to operate according to the calculated target frequency. For example, when the air temperature changes, the corresponding preset frequency is calculated to be 52Hz according to the acquired calculation parameters, and at this time, the correction amount 2Hz is added on the basis of the preset frequency of 52Hz, so that the corresponding target frequency is 54Hz, namely, the compressor is controlled to operate according to 54 Hz. It should be noted that, the above steps refer to the foregoing embodiments specifically, and the embodiments of the present invention are not described in detail herein.
In summary, the compressor frequency control method provided by the embodiment of the invention has the following advantages: (1) The indoor temperature and the indoor temperature are faster, and the response is more timely by acquiring the calculation parameters, calculating the room cooling load according to the calculation parameters and taking the frequency corresponding to the room cooling load as the preset frequency to adjust the frequency of the compressor; (2) Adjusting the frequency of the compressor according to the difference between the return air temperature and the user set temperature so as to enable the indoor temperature to quickly approach the user set temperature; and correcting the preset frequency according to the return air temperature, so that the frequency adjustment of the compressor is more accurate; (3) After the indoor temperature approaches to the set temperature of the user, the corresponding preset frequency is corrected according to the correction quantity delta F by recording the correction quantity delta F for correcting the first preset frequency, and in subsequent adjustment, the frequency of the lifting of the compressor is reduced, and the service life of the compressor is prolonged; the fluctuation range of the room temperature can be reduced, the temperature in the room can be quickly stabilized, and the user comfort experience is improved.
Corresponding to the above method embodiment, the embodiment of the present invention further provides a compressor frequency control device, as shown in fig. 4, including: a first acquisition module 41, a first calculation module 42, a second acquisition module 43, a second calculation module 44, a third calculation module 45, a frequency correction module 46, and a period control module 47; wherein, the functions of each module are as follows:
A first obtaining module 41, configured to control the compressor to operate according to an initial target frequency and obtain a return air temperature and a user-set temperature when the variable frequency air conditioner is started to operate;
The first calculating module 42 is configured to calculate a first difference between the return air temperature and the user-set temperature, and adjust the frequency of the compressor according to the first difference until the first difference is less than a preset first threshold;
the second obtaining module 43 is configured to obtain the calculation parameter, and calculate a room cooling load of a room where the variable frequency air conditioner is located according to the calculation parameter and the return air temperature at the current moment; wherein, the calculation parameters include: latitude and longitude position information corresponding to a room, outdoor air temperature at the current moment, room area parameters and calculation coefficients;
The second calculating module 44 is configured to calculate a corresponding preset frequency by using the room cooling load as the cooling capacity required to be output by the variable frequency air conditioner;
A third calculation module 45, configured to control the compressor to operate according to a preset frequency, and calculate a second difference between the return air temperature and the user-set temperature when the operation duration reaches the preset duration;
The frequency correction module 46 is configured to correct the preset frequency if the second difference value does not satisfy the balance condition, until the second difference value satisfies the balance condition, and calculate a correction amount between the preset frequency correction value and the preset frequency;
The period control module 47 is used for controlling the compressor to operate according to the preset frequency correction value and periodically acquiring calculation parameters according to preset intervals; and in each period, calculating the corresponding room cooling load and the preset frequency according to the calculated parameters, obtaining the target frequency corresponding to the period according to the preset frequency and the correction quantity, and controlling the compressor to run in the period according to the corresponding target frequency.
According to the compressor frequency control device provided by the embodiment of the invention, in the operation process of the variable frequency air conditioner, the frequency of the compressor is adjusted according to the return air temperature and the user set temperature until the first difference value is smaller than the preset first threshold value, namely the return air temperature is close to the user set temperature; at this time, the cooling load of the room and the corresponding preset frequency are calculated to control the compressor to run according to the preset frequency, and the preset frequency is corrected through the return air temperature, so that the temperature in the room can be quickly stabilized, the temperature fluctuation is reduced, the comfort experience degree of a user is improved, the frequency of the lifting frequency of the compressor is reduced, and the service life of the compressor is prolonged.
Preferably, the balance condition includes a preset second threshold value and a preset third threshold value; and the preset third threshold value is more than 0 and less than the preset second threshold value; if the second difference does not meet the balance condition, the apparatus further includes: if the second difference value is a positive value, judging whether the second difference value is not smaller than a preset second threshold value or not; if so, it is determined that the second difference does not satisfy the balance condition.
Preferably, before the second difference does not meet the balance condition, the apparatus further includes: if the second difference value is a negative value, judging whether the second difference value is not greater than a preset third threshold value; if so, it is determined that the second difference does not satisfy the balance condition.
Preferably, the frequency correction module 46 further includes: and carrying out improvement correction on the preset frequency until the second difference value is smaller than a preset second threshold value.
Preferably, the frequency correction module 46 further includes: and reducing and correcting the preset frequency until the second difference value is larger than a preset third threshold value.
Preferably, the second obtaining module 43 further includes: calculating according to the calculation parameters and the return air temperature at the current moment to obtain the cooling load of the enclosure structure; acquiring a preset heat dissipation value, and calculating to obtain a room cooling load according to the enclosure cooling load and the preset heat dissipation value; wherein, preset heat dissipation value includes: human body heat dissipation value, lamplight heat dissipation value and equipment heat dissipation value.
Preferably, the apparatus further comprises: acquiring the outdoor environment temperature of the variable frequency air conditioner when the variable frequency air conditioner is started; an initial target frequency is determined based on the outdoor ambient temperature.
The compressor frequency control device provided by the embodiment of the invention has the same technical characteristics as the compressor frequency control method provided by the embodiment, so that the same technical problems can be solved, and the same technical effects can be achieved.
The embodiment of the invention also provides a variable frequency air conditioner, which comprises a processor and a memory, wherein the memory stores machine executable instructions which can be executed by the processor, and the processor executes the machine executable instructions to realize the compressor frequency control method.
Referring to fig. 5, the inverter air conditioner includes a processor 100 and a memory 101, the memory 101 storing machine executable instructions executable by the processor 100, the processor 100 executing the machine executable instructions to implement the above-described compressor frequency control method.
Further, the inverter air conditioner shown in fig. 5 further includes a bus 102 and a communication interface 103, and the processor 100, the communication interface 103 and the memory 101 are connected through the bus 102.
The memory 101 may include a high-speed random access memory (RAM, random Access Memory), and may further include a non-volatile memory (non-volatile memory), such as at least one disk memory. The communication connection between the system network element and at least one other network element is implemented via at least one communication interface 103 (which may be wired or wireless), and may use the internet, a wide area network, a local network, a metropolitan area network, etc. Bus 102 may be an ISA (Industrial Standard Architecture, industry standard architecture) bus, PCI (PERIPHERAL COMPONENT INTERCONNECT, peripheral component interconnect standard) bus, or EISA (Enhanced Industry Standard Architecture, extended industry standard architecture) bus, among others. The buses may be classified into address buses, data buses, control buses, and the like. For ease of illustration, only one bi-directional arrow is shown in FIG. 5, but not only one bus or type of bus.
The processor 100 may be an integrated circuit chip with signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in the processor 100 or by instructions in the form of software. The processor 100 may be a general-purpose processor, including a central processing unit (Central Processing Unit, abbreviated as CPU), a network processor (Network Processor, abbreviated as NP), etc.; but may also be a digital signal Processor (DIGITAL SIGNAL Processor, DSP), application Specific Integrated Circuit (ASIC), field-Programmable gate array (FPGA) or other Programmable logic device, discrete gate or transistor logic device, discrete hardware components. The disclosed methods, steps, and logic blocks in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present invention may be embodied directly in the execution of a hardware decoding processor, or in the execution of a combination of hardware and software modules in a decoding processor. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in the memory 101, and the processor 100 reads the information in the memory 101 and, in combination with its hardware, performs the steps of the method of the previous embodiment.
The present embodiments also provide a machine-readable storage medium storing machine-executable instructions that, when invoked and executed by a processor, cause the processor to implement the compressor frequency control method described above.
The compressor frequency control method, the compressor frequency control device and the computer program product of the variable frequency air conditioner provided by the embodiment of the invention comprise a computer readable storage medium storing program codes, and instructions included in the program codes can be used for executing the method described in the method embodiment, and specific implementation can be referred to the method embodiment and will not be repeated here.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described system and apparatus may refer to corresponding procedures in the foregoing method embodiments, which are not described herein again.
In addition, in the description of embodiments of the present invention, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a non-volatile computer readable storage medium executable by a processor. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above examples are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention, but it should be understood by those skilled in the art that the present invention is not limited thereto, and that the present invention is described in detail with reference to the foregoing examples: any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or perform equivalent substitution of some of the technical features, while remaining within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A method of controlling a compressor frequency, the method comprising:
when the variable frequency air conditioner is started to operate, controlling the compressor to operate according to an initial target frequency, and acquiring a return air temperature and a user set temperature;
Calculating a first difference between the return air temperature and the user set temperature, and adjusting the frequency of the compressor according to the first difference until the first difference is smaller than a preset first threshold;
Acquiring calculation parameters, and calculating the room cooling load of the room where the variable frequency air conditioner is located according to the calculation parameters and the return air temperature at the current moment; wherein the calculated parameters include: the longitude and latitude position information corresponding to the room, the outdoor air temperature at the current moment, the room area parameter and the calculation coefficient;
Taking the room cooling load as the cooling capacity required to be output by the variable frequency air conditioner, and calculating to obtain a corresponding preset frequency;
Controlling the compressor to run according to the preset frequency, and calculating a second difference value between the return air temperature and the user-set temperature when the running time reaches the preset time;
If the second difference value does not meet the balance condition, correcting the preset frequency until the second difference value meets the balance condition, and calculating a correction amount between the preset frequency correction value and the preset frequency;
Controlling the compressor to run according to the preset frequency correction value, and periodically acquiring the calculation parameters according to preset intervals; and in each period, calculating the corresponding room cooling load and the preset frequency according to the calculation parameters, obtaining a target frequency corresponding to the period according to the preset frequency and the correction amount, and controlling the compressor to operate according to the corresponding target frequency in the period;
wherein the balance condition comprises a preset second threshold value and a preset third threshold value; and the preset third threshold value is less than 0 and less than the preset second threshold value; if the second difference does not meet the balance condition, the method further includes:
If the second difference value is a positive value, judging whether the second difference value is not smaller than the preset second threshold value or not; if yes, judging that the second difference value does not meet the balance condition;
if the second difference value is a negative value, judging whether the second difference value is not greater than the preset third threshold value; if so, the second difference value is judged to not meet the balance condition.
2. The method of claim 1, wherein the step of correcting the predetermined frequency until the second difference satisfies the balance condition comprises:
and carrying out improvement correction on the preset frequency until the second difference value is smaller than the preset second threshold value.
3. The method of claim 1, wherein the step of correcting the predetermined frequency until the second difference satisfies the balance condition further comprises:
And reducing and correcting the preset frequency until the second difference value is larger than the preset third threshold value.
4. The method of claim 1, wherein the step of calculating a room cooling load of a room in which the inverter air conditioner is located based on the calculated parameter and the return air temperature at the current time comprises:
Calculating according to the calculation parameters and the return air temperature at the current moment to obtain the cooling load of the enclosure structure;
Acquiring a preset heat dissipation value, and calculating to obtain the room cooling load according to the enclosure cooling load and the preset heat dissipation value; wherein the preset heat dissipation value includes: human body heat dissipation value, lamplight heat dissipation value and equipment heat dissipation value.
5. The method according to claim 1, wherein the method further comprises:
Acquiring the outdoor environment temperature of the variable frequency air conditioner when the variable frequency air conditioner is started;
and determining the initial target frequency according to the outdoor environment temperature.
6. A compressor frequency control apparatus, said apparatus comprising:
the first acquisition module is used for controlling the compressor to operate according to the initial target frequency when the variable frequency air conditioner is started to operate, and acquiring the return air temperature and the user set temperature;
The first calculation module is used for calculating a first difference value between the return air temperature and the user set temperature, and adjusting the frequency of the compressor according to the first difference value until the first difference value is smaller than a preset first threshold value;
The second acquisition module is used for acquiring the calculation parameters and calculating the room cooling load of the room where the variable-frequency air conditioner is located according to the calculation parameters and the return air temperature at the current moment; wherein the calculated parameters include: the longitude and latitude position information corresponding to the room, the outdoor air temperature at the current moment, the room area parameter and the calculation coefficient;
the second calculation module is used for taking the room cooling load as the cooling capacity required to be output by the variable frequency air conditioner and calculating to obtain corresponding preset frequency;
the third calculation module is used for controlling the compressor to run according to the preset frequency, and calculating a second difference value between the return air temperature and the user set temperature when the running time reaches the preset time;
The frequency correction module is used for correcting the preset frequency if the second difference value does not meet the balance condition until the second difference value meets the balance condition, and calculating a correction value between the preset frequency correction value and the preset frequency;
The period control module is used for controlling the compressor to operate according to the preset frequency correction value and periodically acquiring the calculation parameters according to preset intervals; and in each period, calculating the corresponding room cooling load and the preset frequency according to the calculation parameters, obtaining a target frequency corresponding to the period according to the preset frequency and the correction amount, and controlling the compressor to operate according to the corresponding target frequency in the period;
Wherein the balance condition comprises a preset second threshold value and a preset third threshold value; and the preset third threshold value is less than 0 and less than the preset second threshold value; if the second difference does not meet the balance condition, the apparatus further includes:
If the second difference value is a positive value, judging whether the second difference value is not smaller than the preset second threshold value or not; if yes, judging that the second difference value does not meet the balance condition;
if the second difference value is a negative value, judging whether the second difference value is not greater than the preset third threshold value; if so, the second difference value is judged to not meet the balance condition.
7. A variable frequency air conditioner 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 steps of the method of any of the preceding claims 1-5 when executing the computer program.
8. A computer-readable storage medium, characterized in that it has stored thereon a computer program which, when executed by a processor, performs the steps of the method according to any of the preceding claims 1-5.
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| CN107062536A (en) * | 2017-03-29 | 2017-08-18 | 广东美的暖通设备有限公司 | Auxiliary method for controlling frequency conversion, system and the convertible frequency air-conditioner of air-conditioning |
| CN111623492B (en) * | 2020-05-06 | 2022-07-12 | 青岛海尔空调电子有限公司 | Air conditioner and compressor control method thereof |
| CN114151915B (en) * | 2021-11-22 | 2023-11-07 | 宁波奥克斯电气股份有限公司 | Compressor frequency control method and device and air conditioner |
| CN115451564A (en) * | 2022-08-04 | 2022-12-09 | 宁波奥克斯电气股份有限公司 | Air conditioner frequency control method and device and air conditioner |
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| CN103486692A (en) * | 2013-09-17 | 2014-01-01 | 青岛海信日立空调系统有限公司 | Load self-adaptation variable-frequency multi-connection heat pump system and method for controlling compressor frequency |
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