CN109489217B - Control method for preventing variable frequency air conditioner from stopping when temperature is reached - Google Patents
Control method for preventing variable frequency air conditioner from stopping when temperature is reached Download PDFInfo
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- CN109489217B CN109489217B CN201710806928.2A CN201710806928A CN109489217B CN 109489217 B CN109489217 B CN 109489217B CN 201710806928 A CN201710806928 A CN 201710806928A CN 109489217 B CN109489217 B CN 109489217B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/025—Compressor control by controlling speed
- F25B2600/0253—Compressor control by controlling speed with variable speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/17—Speeds
- F25B2700/171—Speeds of the compressor
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Abstract
The invention discloses a control method for preventing a variable frequency air conditioner from stopping at a temperature, wherein the air conditioner comprises a control device, and the control device presets a trigger condition of a mode of preventing the variable frequency air conditioner from stopping at the temperature and an operation frequency f of preventing the variable frequency air conditioner from stopping at the temperatureiStopping the machine under the condition of reaching the temperature and preventing the machine from reaching the temperature from stopping the wind gear; f. ofiThe driving reliability is met, and the stress vibration of the pipeline is qualified; the method comprises the following steps: (1) judging whether a triggering condition of a temperature-reaching prevention shutdown mode is met; if not, maintaining the current; if yes, entering a temperature-reaching prevention shutdown mode; (2) down conversion to fiWherein the initial value of i is 1, i is not more than N, N is more than 1 and N belongs to N+(ii) a (3) Judging whether a temperature-reaching shutdown condition is met; if not, maintaining the current; if yes, judging whether i is equal to n, and if not, entering the step (4); if yes, entering the step (5); (4) returning to the step (2) when i is equal to i + 1; (5) the rotating speed of the outer fan is reduced to a wind gear for preventing the temperature from reaching the shutdown; the invention can improve the comfort of the product, avoid the problem of sudden cooling and sudden heating caused by temperature-reaching shutdown and save power consumption.
Description
Technical Field
The invention belongs to the technical field of air conditioner control, and particularly provides a control method for preventing a variable frequency air conditioner from stopping when the variable frequency air conditioner reaches a temperature.
Background
At present, in a household air conditioner, if a temperature set by a user is reached in a cooling or heating process, the air conditioner is automatically stopped, that is, a compressor stops working. However, a part of energy of the internal evaporator needs to be released, and the internal fan needs to continue to operate, so that the net port of the internal fan blows out wind, for example, the air port of the internal fan blows out hot wind in the cooling mode, and the air port of the internal fan blows out cold wind in the heating mode, so that the comfort level of a user is deteriorated. If the air guide strip is directly closed after the air conditioner is shut down when reaching the temperature, the heat or cold in the evaporator of the indoor unit cannot be well released, so that the plastic part of the indoor unit is deformed, and the reliability of the air conditioner is reduced. Thus, the frequent temperature-reaching shutdown can greatly reduce the comfort of the room due to the fluctuation of the indoor environment temperature and the discontinuity of the air conditioner sound; on the other hand, frequent shutdown at a high temperature cannot effectively save energy and electricity, and the service life of the compressor is greatly influenced.
Cn201510214564.x the invention provides a control method, a controller and a fixed-frequency air conditioner for the fixed-frequency air conditioner, wherein the method comprises the following steps: acquiring a current indoor temperature value and a current outdoor temperature value; comparing the current indoor temperature value with a set temperature value of a fixed-frequency air conditioner; when the current indoor temperature value is less than or equal to the set temperature value, adjusting the refrigerant flow of the fixed-frequency air conditioner through an electronic expansion valve according to the current outdoor temperature value and the set temperature value; the electronic expansion valve is arranged on a connecting pipe which is arranged at two ends of a compressor of the fixed-frequency air conditioner and used for directly returning air to the compressor and used for adjusting the flow of a refrigerant. The invention can avoid the influence of frequent temperature-reaching shutdown on the fluctuation of the room temperature and the service life of the compressor, and realize the automatic control of the energy-saving and comfortable function of the fixed-frequency air conditioner.
Aiming at a fixed-frequency air conditioner, the method is characterized in that connecting pipes for directly returning air to the compressor are arranged at two ends of the compressor of the fixed-frequency air conditioner, an electronic expansion valve is arranged on the connecting pipes, and the flow of a refrigerant is controlled by controlling the opening degree of the electronic expansion valve, so that the fluctuation of the room temperature and the influence on the service life of the compressor caused by frequent temperature-reaching shutdown can be avoided, and the automatic control of the energy-saving comfortable function of the fixed-frequency air conditioner is realized, thereby realizing the energy-saving comfortable function of the fixed-frequency air conditioner. The method is set for the fixed-frequency air conditioner and needs to additionally set an electronic expansion valve.
The invention relates to a temperature reaching shutdown control method suitable for an air conditioner and the air conditioner, and CN 201610825399.6. The method comprises the following steps: the controller receives the current indoor temperature value collected by the temperature sensor in real time and compares the current indoor temperature value with a set temperature value; when the current indoor temperature value and the set temperature value meet a first preset condition, the controller generates: the first compressor control instruction is used for controlling the compressor to stop working; the first outdoor fan control instruction is used for controlling the outdoor fan to stop working; the second indoor fan control instruction is used for controlling the indoor fan to work at the first preset indoor fan rotating speed; and the first/second air guide strip control instruction is used for controlling the air guide strip to move from the first position to the second position or keep the second position stationary, so that the included angle between the air guide strip and the air outlet of the indoor fan is a preset angle to prevent wind from blowing to a user. The air conditioner is used for executing the temperature-reaching shutdown control method. The invention can prevent the air from blowing directly to the body of the user and improve the comfort of the user.
The discomfort degree caused by the warm shutdown is relieved through the control of the compressor, the outdoor fan, the indoor fan and the air guide strip in the technology, but the compressor is still in a frequent warm shutdown state, the energy and the power can not be effectively saved, and the service life of the compressor can be greatly influenced.
In conclusion, when the room temperature reaches the temperature set by the user, the frequency converter can reduce the running frequency and the cold output, so that the room temperature is stabilized at the temperature set by the user. The fixed-frequency air conditioner can still continuously output the same cooling capacity when reaching the temperature set by a user due to the non-adjustable frequency, and is very easy to cause temperature-reaching shutdown. After the machine is stopped, the temperature of the room rises, the air conditioner is started again to cool, people feel cool and hot, and the comfort is poor. However, most of the frequency of the existing variable frequency air conditioner between 1 Hz and 30Hz cannot meet the design requirements due to driving and pipeline stress vibration, so that the lowest allowable lowest operation frequency is 30Hz during design. However, when the cooling capacity generated by the 30Hz operation of the air conditioner is still larger than the room requirement, especially when the air conditioner is used in a small room, the problem of frequent shutdown due to temperature reaching still exists, so that the room temperature fluctuates, the comfort is reduced, and the power consumption is increased due to frequent startup and shutdown of the compressor.
The invention is provided in view of the above.
Disclosure of Invention
The invention aims to provide a control method for preventing a variable frequency air conditioner from stopping when reaching a temperature, so as to solve the problems.
In order to realize the purpose, the invention adopts the following technical scheme:
a control method for preventing the frequency-variable air conditioner from stopping when it reaches temp is disclosed, which is composed of a controllerThe control device presets a triggering condition of a temperature-reaching-prevention shutdown mode and a temperature-reaching-prevention shutdown operation frequency fiPreventing the condition of stopping the machine from reaching the temperature and preventing the wind gear of stopping the machine from reaching the temperature; the temperature-reaching-prevention shutdown operation frequency fiThe driving reliability is met, and the stress vibration of the pipeline is qualified; the method comprises the following steps:
(1) judging whether the running condition of the air conditioner meets the triggering condition of the temperature-reaching-prevention shutdown mode or not by the control device after the air conditioner is started; if not, maintaining the current state; if so, the air conditioner enters a temperature-reaching-prevention shutdown mode;
(2) air conditioner down-conversion to temperature-reaching-prevention shutdown operation frequency fiRunning, wherein the initial value of i is 1, i is less than or equal to N, N is greater than 1 and N belongs to N+；
(3) Judging whether the temperature-reaching-prevention shutdown condition is met; if not, maintaining the current state; if yes, judging whether i is equal to n, and if not, entering the step (4); if yes, entering the step (5);
(4) returning to the step (2) when i is equal to i + 1;
(5) the rotating speed of an external fan of the air conditioner is reduced to a wind gear for preventing the temperature from being reached;
wherein the operation frequency f of the shutdown for preventing temperature reachingiFor a plurality of discrete frequency values, fi＞fi+1。
Preferably, the operation frequency f of the temperature-up-proof shutdown is setiLower than the lowest frequency f of the normal operation of the air conditioner0(ii) a The triggering condition of the temperature-reaching-prevention shutdown mode is that the frequency of the compressor is the lowest frequency f of the conventional operation of the air conditioner0And the current room temperature TAWith a target temperature TSDifference value | T ofS-TAUpper limit of temperature difference between | and Δ T2Lower limit of temperature difference Delta T1Satisfies a predetermined DeltaT2＞|TS-TA|≥△T1。
Preferably, the anti-warm-up shutdown condition is the compressor to allow the operating frequency fiTime of operation tiAnd a predetermined time t0Satisfies the relationship of (1)i＝t0And the current room temperature TAWith a target temperature TSDifference value | T ofS-TAUpper limit of temperature difference between | and Δ T2Lower limit of temperature difference Delta T1Satisfies a predetermined DeltaT2＞|TS-TA|≥△T1。
Preferably, the triggering condition for the normal operation of the air conditioner to reach the temperature and the shutdown is the current room temperature TAWith a target temperature TSDifference value | T ofS-TADelta T value of temperature difference between I and shutdown0Has a relationship of | TS-TA|＝△T0And its duration is equal to the down time t0' when, the air conditioner is normally stopped at a warm state.
Preferably, the upper limit of the temperature difference DeltaT2Lower limit of temperature difference Delta T1And shutdown temperature difference value delta T0Is 0℃ & lt Delta T1＜△T2＜△T0A preset time t0And the down time t0' the relationship is t0＜t0’。
A control method for preventing a variable frequency air conditioner from stopping at a temperature comprises a control device, wherein the control device presets a trigger condition of a mode of preventing the variable frequency air conditioner from stopping at the temperature and a stop operation frequency f of preventing the variable frequency air conditioner from stopping at the temperature1Preventing the condition of stopping the machine from reaching the temperature and preventing the wind gear of stopping the machine from reaching the temperature; the temperature-reaching-prevention shutdown operation frequency f1The driving reliability is met, and the stress vibration of the pipeline is qualified; the method comprises the following steps:
(1) judging whether the running condition of the air conditioner meets the triggering condition of the temperature-reaching-prevention shutdown mode or not by the control device after the air conditioner is started; if not, maintaining the current state; if so, the air conditioner enters a temperature-reaching-prevention shutdown mode;
(2) air conditioner down-conversion to temperature-reaching-prevention shutdown operation frequency f1Running;
(3) judging whether the temperature-reaching-prevention shutdown condition is met; if not, maintaining the current state; if yes, the rotating speed of the external fan of the air conditioner is reduced to a wind gear for preventing the temperature from reaching the shutdown.
Preferably, the operation frequency f of the temperature-up-proof shutdown is setiLower than the lowest frequency f of the normal operation of the air conditioner0(ii) a The triggering condition of the temperature-reaching-prevention shutdown mode is that the frequency of the compressor is the lowest frequency f of the conventional operation of the air conditioner0And the current room temperature TAWith a target temperature TSDifference value | T ofS-TAUpper limit of temperature difference between | and Δ T2Lower limit of temperature difference Delta T1Satisfies a predetermined DeltaT2＞|TS-TA|≥△T1。
Preferably, the anti-warm-up shutdown condition is the compressor to allow the operating frequency f1Time of operation t1And a predetermined time t0Satisfies the relationship of (1)1＝t0And the current room temperature TAWith a target temperature TSDifference value | T ofS-TAUpper limit of temperature difference between | and Δ T2Lower limit of temperature difference Delta T1Satisfies a predetermined DeltaT2＞|TS-TA|≥△T1。
Preferably, the triggering condition for the normal operation of the air conditioner to reach the temperature and the shutdown is the current room temperature TAWith a target temperature TSDifference value | T ofS-TADelta T value of temperature difference between I and shutdown0Has a relationship of | TS-TA|＝△T0And its duration is equal to the down time t0' when, the air conditioner is normally stopped at a warm state.
Preferably, the upper limit of the temperature difference DeltaT2Lower limit of temperature difference Delta T1And shutdown temperature difference value delta T0Is 0℃ & lt Delta T1＜△T2＜△T0A preset time t0And the down time t0' the relationship is t0＜t0’。
Advantageous effects
The control method for preventing the variable frequency air conditioner from stopping at the temperature meets the requirement on driving reliability by selecting a plurality of frequencies between 1 Hz and 30Hz, takes the frequency qualified by pipeline stress vibration as the allowable operation frequency for preventing the variable frequency air conditioner from stopping at the temperature, and controls the wind gear of the fan of the outer machine to directly fall to the wind gear for preventing the variable frequency air conditioner from stopping at the temperature when the frequency is reduced to the third allowable operation frequency for preventing the variable frequency air conditioner from stopping at the temperature and still reaches the temperature for stopping; finally, when the frequency converter is close to the temperature-reaching shutdown, the temperature-reaching shutdown prevention control can be carried out on the frequency converter; the invention can improve the product comfort and avoid the problem of sudden cooling and sudden heating caused by the shutdown when reaching the temperature; and simultaneously, the power consumption is saved.
Drawings
FIG. 1 is a diagram of a control device of the present invention;
FIG. 2 is a control flow chart of a first embodiment of the control method of the present invention;
FIG. 3 is a control flow chart of a second embodiment of the control method of the present invention;
FIG. 4 is a control flow chart of a third embodiment of the control method of the present invention;
description of the reference numerals
To further clarify the structure and connection between the various components of the present invention, the following reference numerals are given and described.
The device comprises an acquisition module 1, a judgment module 2 and a control module 3.
The technical scheme of the invention can be more clearly understood and explained by combining the embodiment of the invention through the reference sign description.
Detailed Description
The present invention is further described below in conjunction with specific examples to enable those skilled in the art to better understand the present invention and to practice it, but the scope of the present invention as claimed is not limited to the scope described in the specific embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
Example 1
A control method for preventing a variable frequency air conditioner from stopping when the temperature is reached comprises a control device, wherein the control device presets the lowest frequency f of conventional operation0Allowable operating frequency f1A predetermined temperature TSCurrent room temperature of TAShutdown temperature difference value delta T0Downtime t0', lower limit of temperature difference Delta T1Upper limit of temperature difference Delta T2A preset time t0And the outer fan prevents reaching the warm stop wind gear. Delta T of air conditioner in this embodiment0＝|TS-T A2 deg.C, lower limit of temperature difference Delta T10.5 deg.C, upper limit of temperature difference Delta T 21 ℃ is added; when Δ T0＝|TS-T A2 ℃ and for t0' when the machine is operated for 10min, the machine is stopped at a normal temperature; lowest frequency f of normal operation030Hz, preset f1＝25Hz、t 02 min; the allowable operating frequency f1The driving reliability is met, and the pipeline stress vibration is qualified. Accordingly, at the allowable operating frequency f1The running time of the run is recorded by t1。
As shown in fig. 1, the air conditioner control device includes an obtaining module 1, a determining module 2, and a control module 3.
The acquisition module 1 is used for acquiring the running frequency of the compressor and the current room temperature TAAt the allowed operating frequency f1The running time of the run is recorded by t1；
And the judging module 2 compares the acquired parameters with corresponding preset values for judgment. The obtained running frequency of the compressor and the lowest frequency f0And comparing to judge whether to enter the anti-reaching temperature shutdown control mode.
The judging module 2 obtains the running frequency of the compressor and the allowable running frequency f1Making comparison to judge whether the acquisition module 1 is used to acquire corresponding allowable operating frequency f1Time of operation t1. The judgment module 2 compares t with1And a predetermined time t0Comparing and judging to judge whether to compare | TS-TALower limit of temperature difference1Upper limit of temperature difference Delta T2And (6) comparing and judging. The judgment module 2 judges t1And a predetermined time t0When they are equal, the judgment module 2 will | TS-TALower limit of temperature difference1Upper limit of temperature difference Delta T2And comparing and judging to judge whether to enter a next stage.
The control module 3 determines the corresponding operation triggered by the judgment module 2 according to the judgment result of the judgment module, and sends out a corresponding operation instruction to enable the air conditioner to execute the corresponding operation.
As shown in fig. 2, the control method for preventing the inverter air conditioner from stopping when the temperature reaches the preset value includes the following steps:
(1) the air conditioner enters a refrigerating or heating mode, and the compressor normally operates according to the refrigerating or heating mode;
(2) judging whether 1 ℃ ═ Δ T is satisfied2＞|TS-TA|≥△T10.5 ℃ and the compressor frequency is the lowest frequency f030 Hz; if not, maintaining normal operation; if yes, the air conditioner enters a temperature-resistant stop control mode, and the compressor reduces the frequency to the allowable operation frequency f1And at an allowable operating frequency f1Running;
(3) obtaining the compressor to allow for the operating frequency f1Time of operation, and judging t1And t0When running time t1＝t0Then, determine if 1 ℃ > T is satisfiedS-TANot less than 0.5 ℃; if not, maintaining the current state; if yes, the rotating speed of the external fan of the air conditioner is reduced to a wind gear for preventing the temperature from reaching the shutdown.
Example 2
A control method for preventing a variable frequency air conditioner from stopping when the temperature is reached comprises a control device, wherein the control device presets the lowest frequency f of conventional operation0First allowable operating frequency f1A second allowable operating frequency f2A predetermined temperature TSCurrent room temperature of TAShutdown temperature difference value delta T0Downtime t0', lower limit of temperature difference Delta T1Upper limit of temperature difference Delta T2A preset time t0And the outer fan prevents reaching the warm stop wind gear. Delta T of air conditioner in this embodiment0＝|TS-T A2 deg.C, lower limit of temperature difference Delta T10.5 deg.C, upper limit of temperature difference Delta T 21 ℃ is added; when Δ T0＝|TS-T A2 ℃ and for t0' when the machine is operated for 10min, the machine is stopped at a normal temperature; lowest frequency f of normal operation030Hz, preset f1＝25Hz、f2＝20Hz；t 02 min; said first permitted operating frequency f1A second allowable operating frequency f2The driving reliability is met, and the pipeline stress vibration is qualified. Accordingly, at the first permitted operating frequency f1A second allowable operating frequency f2Respectively records the running time of the operationT is1、t2。
As shown in fig. 1, the air conditioner control device includes an obtaining module 1, a determining module 2, and a control module 3.
The acquisition module 1 is used for acquiring the running frequency of the compressor and the current room temperature TAAt the first allowable operating frequency f1A second allowable operating frequency f2Respectively records t1、t2；
And the judging module 2 compares the acquired parameters with corresponding preset values for judgment. The obtained running frequency of the compressor and the lowest frequency f0And comparing to judge whether to enter the anti-reaching temperature shutdown control mode.
The judging module 2 obtains the operating frequency of the compressor and the first allowable operating frequency f1A second allowable operating frequency f2Comparing to determine whether to use the acquisition module 1 to acquire the corresponding first allowable operating frequency f1A second allowable operating frequency f2Time of operation t1、t2. The judgment module 2 compares t with1、t2Respectively corresponding to the preset time t0Comparing and judging to judge whether to compare | TS-TALower limit of temperature difference1Upper limit of temperature difference Delta T2And (6) comparing and judging. The judgment module 2 judges t1、t2Respectively corresponding to the preset time t0When they are equal, the judgment module 2 will | TS-TALower limit of temperature difference1Upper limit of temperature difference Delta T2And comparing and judging to judge whether to enter a next stage.
The control module 3 determines the corresponding operation triggered by the judgment module 2 according to the judgment result of the judgment module, and sends out a corresponding operation instruction to enable the air conditioner to execute the corresponding operation.
As shown in fig. 3, the control method for preventing the inverter air conditioner from stopping when the temperature reaches the preset value includes the following steps:
(1) the air conditioner enters a refrigerating or heating mode, and the compressor normally operates according to the refrigerating or heating mode;
(2) judging whether 1 ℃ ═ Δ T is satisfied2＞|TS-TA|≥△T10.5 ℃ and the compressor frequency is the lowest frequency f030 Hz; if not, maintaining normal operation; if yes, the air conditioner enters a temperature-resistant stop control mode, and the compressor reduces the frequency to a first allowed operation frequency f1And at a first allowed operating frequency f1Running;
(3) obtaining the compressor at the first allowable operating frequency f1Time of operation, and judging t1And t0When running time t1＝t0Then, determine if 1 ℃ > T is satisfiedS-TANot less than 0.5 ℃; if not, maintaining the current state; if yes, the compressor is down-converted to a second allowable operating frequency f2And at a second allowed operating frequency f2Running;
(4) obtaining the compressor at the second allowable operating frequency f2Time of operation, and judging t1And t0When running time t2＝t0Then, determine if 1 ℃ > T is satisfiedS-TANot less than 0.5 ℃; if not, maintaining the current state; if so, controlling the rotating speed of the outer fan to be reduced to prevent reaching the stop wind gear of the temperature.
Example 3
A control method for preventing a variable frequency air conditioner from stopping when the temperature is reached comprises a control device, wherein the control device presets the lowest frequency f of conventional operation0First allowable operating frequency f1A second allowable operating frequency f2A third allowable operating frequency f3A predetermined temperature TSCurrent room temperature of TAShutdown temperature difference value delta T0Downtime t0', lower limit of temperature difference Delta T1Upper limit of temperature difference Delta T2A preset time t0And the outer fan prevents reaching the warm stop wind gear. Delta T of air conditioner in this embodiment0＝|TS-T A2 deg.C, lower limit of temperature difference Delta T10.5 deg.C, upper limit of temperature difference Delta T 21 ℃ is added; when Δ T0＝|TS-T A2 ℃ and for t0' when the machine is operated for 10min, the machine is stopped at a normal temperature; lowest frequency f of normal operation030Hz, preset f1＝25Hz、f2＝20Hz、f3＝10Hz；t 02 min; said first permitted operating frequency f1A second allowable operating frequency f2A third allowable operating frequency f3The driving reliability is met, and the pipeline stress vibration is qualified. Accordingly, at the first permitted operating frequency f1A second allowable operating frequency f2A third allowable operating frequency f3Respectively records t1、t2、t3。
As shown in fig. 1, the air conditioner control device includes an obtaining module 1, a determining module 2, and a control module 3.
The acquisition module 1 is used for acquiring the running frequency of the compressor and the current room temperature TAAt the first allowable operating frequency f1A second allowable operating frequency f2A third allowable operating frequency f3Respectively records t1、t2、t3；
And the judging module 2 compares the acquired parameters with corresponding preset values for judgment. The obtained running frequency of the compressor and the lowest frequency f0And comparing to judge whether to enter the anti-reaching temperature shutdown control mode.
The judging module 2 obtains the operating frequency of the compressor and the first allowable operating frequency f1A second allowable operating frequency f2A third allowable operating frequency f3Comparing to determine whether to use the acquisition module 1 to acquire the corresponding first allowable operating frequency f1A second allowable operating frequency f2A third allowable operating frequency f3Time of operation t1、t2、t3. The judgment module 2 compares t with1、t2、t3Respectively corresponding to the preset time t0Comparing and judging to judge whether to compare | TS-TALower limit of temperature difference1Upper limit of temperature difference Delta T2And (6) comparing and judging. The judgment module 2 judges t1、t2、t3Respectively corresponding to the preset time t0When they are equal, the judging module 2 will|TS-TALower limit of temperature difference1Upper limit of temperature difference Delta T2And comparing and judging to judge whether to enter a next stage.
The control module 3 determines the corresponding operation triggered by the judgment module 2 according to the judgment result of the judgment module, and sends out a corresponding operation instruction to enable the air conditioner to execute the corresponding operation.
As shown in fig. 4, the control method for preventing the inverter air conditioner from stopping when the temperature is reached includes the following specific steps:
(1) the air conditioner enters a refrigerating or heating mode, and the compressor normally operates according to the refrigerating or heating mode;
(2) judging whether 1 ℃ ═ Δ T is satisfied2＞|TS-TA|≥△T10.5 ℃ and the compressor frequency is the lowest frequency f030 Hz; if not, maintaining normal operation; if yes, the air conditioner enters a temperature-resistant stop control mode, and the compressor reduces the frequency to a first allowed operation frequency f1And at a first allowed operating frequency f1Running;
(3) obtaining the compressor at the first allowable operating frequency f1Time of operation, and judging t1And t0When running time t1＝t0Then, determine if 1 ℃ > T is satisfiedS-TANot less than 0.5 ℃; if not, maintaining the current state; if yes, the compressor is down-converted to a second allowable operating frequency f2And at a second allowed operating frequency f2Running;
(4) obtaining the compressor at the second allowable operating frequency f2Time of operation, and judging t1And t0When running time t2＝t0Then, determine if 1 ℃ > T is satisfiedS-TANot less than 0.5 ℃; if not, maintaining the current state; if so, the compressor is down-converted to a third allowable operating frequency f3And at a third permitted operating frequency f3Running;
(5) obtaining the third allowable operating frequency f of the compressor3Time of operation, and judging t1And t0When running time t3＝t0Then, judge whether it is fullFoot 1 ℃ higher than | TS-TANot less than 0.5 ℃; if not, maintaining the current state; if so, controlling the rotating speed of the outer fan to be reduced to prevent reaching the stop wind gear of the temperature.
The control method for preventing the variable frequency air conditioner from stopping when reaching the temperature is adopted.
The control method for preventing the variable frequency air conditioner from stopping at the temperature meets the requirement on driving reliability by selecting a plurality of frequencies between 1 Hz and 30Hz, takes the frequency qualified by pipeline stress vibration as the allowable operation frequency for preventing the variable frequency air conditioner from stopping at the temperature, and controls the wind gear of the fan of the outer machine to directly fall to the wind gear for preventing the variable frequency air conditioner from stopping at the temperature when the frequency is reduced to the third allowable operation frequency for preventing the variable frequency air conditioner from stopping at the temperature and still reaches the temperature for stopping; finally, when the frequency converter is close to the temperature-reaching shutdown, the temperature-reaching shutdown prevention control can be carried out on the frequency converter; the invention can improve the product comfort and avoid the problem of sudden cooling and sudden heating caused by the shutdown when reaching the temperature; and simultaneously, the power consumption is saved.
In the description of the present application, the terms "mounted," "connected," "fixed," and the like are used in a broad sense, and for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; either directly or through an intermediary profile. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In the description of the present specification, the description of the terms "one embodiment," "some embodiments," "a specific embodiment," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application, and exemplary expressions for the terms above do not necessarily refer to the same embodiment or embodiment in the specification. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
It should be understood by those skilled in the art that although the embodiments of the present invention have been described above, the embodiments are only used for understanding the present invention, and are not intended to limit the embodiments of the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. A control method for preventing a variable frequency air conditioner from stopping when reaching a temperature is characterized in that: the air conditioner comprises a control device, wherein the control device presets a triggering condition for preventing a temperature-reaching shutdown mode and a temperature-reaching shutdown operation frequency fiPreventing the condition of stopping the machine from reaching the temperature and preventing the wind gear of stopping the machine from reaching the temperature; the temperature-reaching-prevention shutdown operation frequency fiThe driving reliability is met, and the stress vibration of the pipeline is qualified; the temperature-reaching-prevention shutdown operation frequency fiLower than the lowest frequency f of the normal operation of the air conditioner0(ii) a The triggering condition of the temperature-reaching-prevention shutdown mode is that the frequency of the compressor is the lowest frequency f of the conventional operation of the air conditioner0And the current room temperature TAWith a target temperature TSDifference value | T ofS-TAUpper limit of temperature difference between | and Δ T2Lower limit of temperature difference Delta T1Satisfies a predetermined DeltaT2＞|TS-TA|≥△T1(ii) a The anti-temperature-reaching shutdown condition is that the compressor is operated at an allowable operating frequency fiTime of operation tiAnd a predetermined time t0Satisfies the relationship of (1)i＝t0And the current room temperature TAWith a target temperature TSDifference value | T ofS-TAUpper limit of temperature difference between | and Δ T2Lower limit of temperature difference Delta T1Satisfies a predetermined DeltaT2＞|TS-TA|≥△T1(ii) a The method comprises the following steps:
(1) judging whether the running condition of the air conditioner meets the triggering condition of the temperature-reaching-prevention shutdown mode or not by the control device after the air conditioner is started; if not, maintaining the current state; if so, the air conditioner enters a temperature-reaching-prevention shutdown mode;
(2) air conditioner down-conversion to temperature-reaching-prevention shutdown operation frequency fiRunning, wherein the initial value of i is 1, and i is less than or equal toN, N > 1 and N ∈ N+；
(3) Judging whether the temperature-reaching-prevention shutdown condition is met; if not, maintaining the current state; if yes, judging whether i is equal to n, and if not, entering the step (4); if yes, entering the step (5);
(4) returning to the step (2) when i is equal to i + 1;
(5) the rotating speed of an external fan of the air conditioner is reduced to a wind gear for preventing the temperature from being reached;
wherein the operation frequency f of the shutdown for preventing temperature reachingiFor a plurality of discrete frequency values, fi＞fi+1。
2. The control method according to claim 1, characterized in that: the triggering condition for normal operation, reaching temperature and stopping of the air conditioner is the current room temperature TAWith a target temperature TSDifference value | T ofS-TADelta T value of temperature difference between I and shutdown0Has a relationship of | TS-TA|＝△T0And its duration is equal to the down time t0' when, the air conditioner is normally stopped at a warm state.
3. The control method according to claim 2, characterized in that: upper limit of temperature difference Delta T2Lower limit of temperature difference Delta T1And shutdown temperature difference value delta T0Is 0℃ & lt Delta T1＜△T2＜△T0A preset time t0And the down time t0' the relationship is t0＜t0’。
4. A control method for preventing a variable frequency air conditioner from stopping when reaching a temperature is characterized in that: the air conditioner comprises a control device, wherein the control device presets a triggering condition for preventing a temperature-reaching shutdown mode and a temperature-reaching shutdown operation frequency f1Preventing the condition of stopping the machine from reaching the temperature and preventing the wind gear of stopping the machine from reaching the temperature; the temperature-reaching-prevention shutdown operation frequency f1The driving reliability is met, and the stress vibration of the pipeline is qualified; the temperature-reaching-prevention shutdown operation frequency fiLower than the lowest frequency f of the normal operation of the air conditioner0(ii) a The triggering condition of the temperature-reaching-prevention shutdown mode is that the frequency of the compressor isLowest frequency f for normal operation of air conditioner0And the current room temperature TAWith a target temperature TSDifference value | T ofS-TAUpper limit of temperature difference between | and Δ T2Lower limit of temperature difference Delta T1Satisfies a predetermined DeltaT2＞|TS-TA|≥△T1(ii) a The anti-temperature-reaching shutdown condition is that the compressor is operated at an allowable operating frequency f1Time of operation t1And a predetermined time t0Satisfies the relationship of (1)1＝t0And the current room temperature TAWith a target temperature TSDifference value | T ofS-TAUpper limit of temperature difference between | and Δ T2Lower limit of temperature difference Delta T1Satisfies a predetermined DeltaT2＞|TS-TA|≥△T1(ii) a The method comprises the following steps:
(1) judging whether the running condition of the air conditioner meets the triggering condition of the temperature-reaching-prevention shutdown mode or not by the control device after the air conditioner is started; if not, maintaining the current state; if so, the air conditioner enters a temperature-reaching-prevention shutdown mode;
(2) air conditioner down-conversion to temperature-reaching-prevention shutdown operation frequency f1Running;
(3) judging whether the temperature-reaching-prevention shutdown condition is met; if not, maintaining the current state; if yes, the rotating speed of the external fan of the air conditioner is reduced to a wind gear for preventing the temperature from reaching the shutdown.
5. The control method according to claim 4, characterized in that: the triggering condition for normal operation, reaching temperature and stopping of the air conditioner is the current room temperature TAWith a target temperature TSDifference value | T ofS-TADelta T value of temperature difference between I and shutdown0Has a relationship of | TS-TA|＝△T0And its duration is equal to the down time t0' when, the air conditioner is normally stopped at a warm state.
6. The control method according to claim 5, characterized in that: upper limit of temperature difference Delta T2Lower limit of temperature difference Delta T1And shutdown temperature difference value delta T0Is 0℃ & lt Delta T1＜△T2＜△T0A preset time t0And the down time t0' the relationship is t0＜t0’。
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| CN110285551B (en) * | 2019-06-28 | 2021-05-25 | 广东美的制冷设备有限公司 | Control method and device of air conditioner, air conditioner and electronic equipment |
| CN110701759B (en) * | 2019-10-23 | 2021-06-29 | 广东美的制冷设备有限公司 | Operation control method, operation control device, air conditioner, and storage medium |
| CN111156748B (en) * | 2019-12-25 | 2020-12-22 | 珠海格力电器股份有限公司 | Variable frequency air conditioner limiting power control method, storage medium and air conditioner |
| CN111780372B (en) * | 2020-07-09 | 2021-11-23 | 青岛海尔空调器有限总公司 | Control method of one-driving-multiple air conditioner |
| CN111998496B (en) * | 2020-07-27 | 2021-11-23 | 珠海格力电器股份有限公司 | Air conditioner control method and device, storage medium and air conditioner |
| CN112944578A (en) * | 2021-03-18 | 2021-06-11 | 宁波奥克斯电气股份有限公司 | High-temperature refrigeration method and system for variable-frequency air conditioner and air conditioner |
| CN113251590A (en) * | 2021-05-13 | 2021-08-13 | 海信（山东）空调有限公司 | Control method and device of air conditioner, air conditioner and computer readable storage medium |
| CN113865047B (en) * | 2021-09-29 | 2022-12-16 | 珠海格力节能环保制冷技术研究中心有限公司 | Intelligent air inlet grille control method and air conditioner |
| CN114183889B (en) * | 2021-12-23 | 2023-07-28 | 邵阳学院 | Control method and control device of air conditioner and air conditioner |
| CN114992815A (en) * | 2022-06-20 | 2022-09-02 | 宁波奥克斯电气股份有限公司 | Air conditioner, control method and device thereof and readable storage medium |
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