CN105241006A - Control method and device for variable-frequency air conditioner and variable-frequency air conditioner - Google Patents

Control method and device for variable-frequency air conditioner and variable-frequency air conditioner Download PDF

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CN105241006A
CN105241006A CN201510639173.2A CN201510639173A CN105241006A CN 105241006 A CN105241006 A CN 105241006A CN 201510639173 A CN201510639173 A CN 201510639173A CN 105241006 A CN105241006 A CN 105241006A
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temperature difference
control cycle
temperature
operating frequency
expection
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CN105241006B (en
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王斌
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Hisense Shandong Air Conditioning Co Ltd
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Hisense Shandong Air Conditioning Co Ltd
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Abstract

The invention provides a control method and device for a variable-frequency air conditioner and the variable-frequency air conditioner and relates to the field of air conditioners. By the adoption of the control method and device for the variable-frequency air conditioner and the variable-frequency air conditioner, the accuracy of frequency adjustment control can be improved. According to the specific scheme, the control method comprises the steps that a third temperature difference and a third working frequency are obtained; a second temperature difference, a second working frequency and an expected temperature difference are obtained; the expected temperature difference is the indoor temperature difference to be formed in a first control cycle; a frequency adjustment coefficient is obtained, and the frequency adjustment coefficient is determined according to the second temperature difference, the second working frequency, the third temperature difference and the third working frequency; a first working frequency is determined according to the expected temperature difference, the second temperature difference, the second working frequency and the frequency adjustment coefficient; and a compressor operates according to the first working frequency in the first control cycle. The control method and device are used for controlling and manufacturing of the variable-frequency air conditioner.

Description

A kind of control method of convertible frequency air-conditioner, control device and convertible frequency air-conditioner
Technical field
The present invention relates to field of air conditioning, particularly relate to a kind of control method of convertible frequency air-conditioner, control device and convertible frequency air-conditioner.
Background technology
Convertible frequency air-conditioner, in the process controlled indoor temperature, by changing compressor operating frequency, can change the regulating power of air-conditioning to temperature.Usually, room temperature and design temperature gap larger time, the operating frequency of compressor is higher, to regulate the room temperature rapidly, after room temperature is close to design temperature, by the adjustment to operating frequency, to reach the object steadily keeping room temperature.By certain control algolithm, operating frequency is adjusted to the best, the comfort level of user can be improved, and reduce air conditioning energy consumption, improve Energy Efficiency Ratio.
The control algolithm of existing convertible frequency air-conditioner mostly is FUZZY ALGORITHMS FOR CONTROL.Because it is to the Fuzzy Processing of information, there is the shortcoming that the frequency modulation control degree of accuracy is low in FUZZY ALGORITHMS FOR CONTROL.Such as, FUZZY ALGORITHMS FOR CONTROL carries out frequency modulation control using indoor environment parameter or its variation tendency as feedback parameter, and to the adjustment process of room temperature, itself there is the feature that reaction is slow, time delay is long due to air-conditioning, often governing response is slow to make the frequency modulation control of FUZZY ALGORITHMS FOR CONTROL, and easily there is overshoot, thus the frequency modulation control degree of accuracy is low, affects the comfort level of user.
Summary of the invention
Embodiments of the invention provide a kind of control method of convertible frequency air-conditioner, control device and convertible frequency air-conditioner, can improve the frequency modulation control degree of accuracy, thus improve the comfort level of user.
For achieving the above object, embodiments of the invention adopt following technical scheme:
First aspect, a kind of control method of convertible frequency air-conditioner, comprising:
Obtain the 3rd temperature difference, the 3rd operating frequency; Wherein, described 3rd temperature difference is the indoor temperature difference formed in the 3rd control cycle, and described 3rd operating frequency is the operating frequency of compressor in the 3rd control cycle; Obtain second temperature difference, the second operating frequency and the expection temperature difference; Wherein, described second temperature difference is the indoor temperature difference formed in the second control cycle, described second operating frequency is the operating frequency of compressor in described second control cycle, the indoor temperature difference of the described expection temperature difference for being formed in the first control cycle, described second control cycle be timeline is positioned at described 3rd control cycle after and the control cycle be positioned at before described first control cycle; Obtain coefficient of frequency modulation, described coefficient of frequency modulation is determined by described second temperature difference, described second operating frequency, described 3rd temperature difference and described 3rd operating frequency;
According to the described expection temperature difference, described second temperature difference, described second operating frequency and described coefficient of frequency modulation, determine the first operating frequency;
At the first control cycle, compressor is according to described first operating frequency running.
Second aspect, a kind of control device of convertible frequency air-conditioner, comprising:
Control unit, described control unit comprises acquisition module and setting module; Described acquisition module, for obtaining the 3rd temperature difference, the 3rd operating frequency; Wherein, described 3rd temperature difference is the indoor temperature difference formed in the 3rd control cycle, and described 3rd operating frequency is the operating frequency of compressor in the 3rd control cycle; Described acquisition module, also for obtaining second temperature difference and the second operating frequency; Wherein, described second temperature difference is the indoor temperature difference formed in the second control cycle, and described second operating frequency is the operating frequency of compressor in described second control cycle; Described second control cycle is timeline is positioned at the control cycle after described 3rd control cycle; Described setting module, for obtaining the expection temperature difference; The indoor temperature difference of the described expection temperature difference for being formed in the first control cycle, described first control cycle is timeline is positioned at the control cycle after described second control cycle; Described setting module, also for obtaining coefficient of frequency modulation, described coefficient of frequency modulation is determined according to described second temperature difference, described second operating frequency, described 3rd temperature difference and described 3rd operating frequency by described setting module;
Arithmetic element, for according to the described expection temperature difference, described second temperature difference, described second operating frequency and described coefficient of frequency modulation, determines the first operating frequency;
Adjustment unit, at the first control cycle, controls compressor according to described first operating frequency running.
The third aspect, a kind of convertible frequency air-conditioner, comprises the control device that second aspect provides.
The control method of the convertible frequency air-conditioner that embodiments of the invention provide, control device and convertible frequency air-conditioner, by obtaining the expection temperature difference, second temperature difference, the second operating frequency and coefficient of frequency modulation, calculate the first operating frequency according to above parameter by default control function, and when the first control cycle starts, operating frequency is adjusted to the first operating frequency.The control method for the first control cycle provided by embodiments of the invention, cycle applications, in multiple control cycle, by the expection temperature difference and the coefficient of frequency modulation of renewal, obtains the operating frequency upgraded, completes the adjustment process to room temperature.For different control cycles, by to expection the temperature difference adjustment to make indoor temperature smooth variation, simultaneously by the renewal of coefficient of frequency modulation, when being reflected in different chamber's internal loading, the change of the indoor temperature caused by the change of operating frequency, thus the degree of accuracy that improve frequency modulation control.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The control method of a kind of convertible frequency air-conditioner that Fig. 1 provides for embodiments of the invention one;
The control method of a kind of convertible frequency air-conditioner that Fig. 2 provides for embodiments of the invention two;
Fig. 3 is the time dependent schematic diagram of indoor temperature in embodiments of the invention two;
Fig. 4 is indoor temperature time dependent schematic diagram when introducing ping-pang storage in embodiments of the invention two;
The structural representation of the control device of a kind of convertible frequency air-conditioner that Fig. 5 provides for embodiments of the invention three.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
For the ease of the technical scheme of the clear description embodiment of the present invention, in an embodiment of the present invention, have employed the printed words such as " first ", " second " to distinguish the substantially identical identical entry of function and efficacy or similar item, it will be appreciated by those skilled in the art that the printed words such as " first ", " second " are not limiting quantity and execution order.
Embodiments of the invention provide a kind of control method of convertible frequency air-conditioner, and the operating frequency for the compressor to convertible frequency air-conditioner controls.Unless otherwise noted, the operating frequency of indication in embodiments of the invention, all refers to the operating frequency of the compressor of convertible frequency air-conditioner.
The adjustment process of convertible frequency air-conditioner to room temperature comprises several control cycles, and in an embodiment of the present invention, all corresponding operating frequency of each control cycle, the operating frequency in the first control cycle is the first operating frequency, by that analogy.It should be noted that in addition, the indoor temperature difference in a control cycle, refers to the indoor temperature at the end of this control cycle, deducts the difference of indoor temperature gained when this control cycle starts.
Embodiment one
Embodiments of the invention one provide a kind of control method of convertible frequency air-conditioner, with reference to shown in Fig. 1, comprise the following steps:
101, control device obtains the 3rd temperature difference, the 3rd operating frequency.
The adjustment process of convertible frequency air-conditioner to room temperature comprises several control cycles, before the first control cycle starts, first determine the first operating frequency, the operating frequency namely in the first control cycle, then, when the first control cycle starts, operating frequency is adjusted to the first operating frequency.Preferably, at the end of the adjacent last control cycle of the first control cycle, the first operating frequency is determined.
When determining the first operating frequency, need the relevant parameter obtaining calculating first operating frequency, comprise the 3rd temperature difference and the 3rd operating frequency, wherein, 3rd temperature difference is the indoor temperature difference formed in the 3rd control cycle, namely the indoor temperature at the end of the 3rd control cycle, deducts the difference of indoor temperature gained when the 3rd control cycle starts.3rd operating frequency is the operating frequency of compressor in the 3rd control cycle.
3rd control cycle is control cycle timeline is positioned at before the first control cycle, at least one, interval control cycle between the 3rd control cycle and the first control cycle.
102, the second operating frequency, second temperature difference and the expection temperature difference is obtained.
When determining the first operating frequency, need the relevant parameter obtaining calculating first operating frequency, except the 3rd temperature difference obtained in step 101 and the 3rd operating frequency, also comprise the expection temperature difference, second temperature difference and the second operating frequency, below these three parameters are illustrated one by one.
First, second temperature difference.
Second temperature difference is the indoor temperature difference formed in the second control cycle, the second control cycle be timeline is positioned at the 3rd control cycle after and the control cycle be positioned at before the first control cycle.The indoor temperature difference formed in second control cycle, refers to the indoor temperature at the end of the second control cycle, deducts the difference of indoor temperature gained when the second control cycle starts.
Second, second operating frequency.
Second operating frequency is the operating frequency of compressor in the second control cycle.
3rd, the expection temperature difference.
The indoor temperature difference of the expection temperature difference for being formed in the first control cycle.Concrete, according to the value of parameter preset in the second control cycle, search expection temperature difference table and obtain the expection temperature difference, expection temperature difference table is used to indicate the mapping relations between the value of parameter preset and expection temperature difference value, and wherein parameter preset is the ratio of the second operating frequency and second temperature difference.
Table one
The ratio of the second operating frequency and second temperature difference has reacted the size of room load, and this value is larger, and show that room temperature changes the running frequency of 1 degree Celsius of corresponding compressor greatly, namely indoor load is larger, otherwise, then show that indoor load is less.Indoor load is larger, and indoor temperature change generated in case is slower, and corresponding expection temperature difference value is less.Indoor load is less, and indoor temperature change generated in case is faster, and corresponding expection temperature difference value is larger.
103, coefficient of frequency modulation is obtained.
Coefficient of frequency modulation is used for reflection, under certain indoor load, when operating frequency changes, carrys out much impacts for the Indoor Temperature difference band in a control cycle.Coefficient of frequency modulation is determined by second temperature difference, the second operating frequency, the 3rd temperature difference and the 3rd operating frequency.
The indoor temperature difference in a control cycle, reflects the size of indoor load in this control cycle.The adjustment process of convertible frequency air-conditioner to room temperature comprises multiple control cycle, and in whole temperature adjustment process, the size of indoor load may change.But can think in two control cycles that transient state is approximate adjacent or close, indoor load size remains unchanged or approximate.Simultaneously, because operating frequency remains unchanged in a control cycle, therefore when Practical Calculation, with the difference of the temperature difference in two control cycles adjacent or close before the first control cycle separately respective chamber/chambers, with the ratio of the difference of operating frequency in these two control cycles, as coefficient of frequency modulation, the change of the indoor temperature difference of unit change amount caused by a control cycle of instruction compressor operating frequency.Wherein, the unit change amount of operating frequency can refer to 1 hertz, then when coefficient of frequency modulation refers to the change 1 hertz of operating frequency, and the change of the indoor temperature difference caused in a control cycle.
Embodiments of the invention calculate coefficient of frequency modulation according to the indoor temperature difference in two control cycles adjacent or close before the first control cycle and operating frequency, and two wherein adjacent or close before the first control cycle control cycles are specially the second control cycle and the 3rd control cycle.According to second temperature difference, the second operating frequency, the 3rd temperature difference and the 3rd operating frequency determination coefficient of frequency modulation.Optionally, second temperature difference, the second operating frequency, the 3rd temperature difference and the 3rd operating frequency are substituted into the first formula, calculates coefficient of frequency modulation.First formula is specially: ξ=(△ T 2-△ T 3)/(F2-F3).Wherein, ξ is coefficient of frequency modulation, △ T 2be second temperature difference, F 2be the second operating frequency, △ T 3be the 3rd temperature difference, the indoor temperature difference namely in the 3rd control cycle, F 3be the 3rd operating frequency, the operating frequency namely in the 3rd control cycle.It should be noted that, the 3rd control cycle is control cycle timeline is positioned at before the first control cycle, and the 3rd control cycle is the control cycle adjacent or close with the second control cycle.F 2-F 3be the change total amount of the second control cycle relative to the operating frequency of the 3rd control cycle.△ T 2-△ T 3be the change total amount of the second control cycle relative to the indoor temperature difference of the 3rd control cycle, namely due to operating frequency change total amount caused by total indoor temperature difference.△ T 2-△ T 3with F 2-F 3ratio namely reflect operating frequency unit change amount in the second control cycle on the impact that Indoor Temperature difference band comes.
104, according to the expection temperature difference, second temperature difference, the second operating frequency and coefficient of frequency modulation, the first operating frequency is determined.
Embodiments of the invention utilize two control cycle determination coefficients of frequency modulation that transient state is approximate, with the impact indicating the unit change amount of compressor operating frequency to bring the indoor temperature difference in a control cycle, further, calculate to form the expection temperature difference in the first control cycle according to coefficient of frequency modulation, the variable quantity of the operating frequency needed, and finally using this variable quantity and the second operating frequency and as the value of the first operating frequency, namely default control function is that the first operating frequency is about the expection temperature difference, second temperature difference, the function of the second operating frequency and coefficient of frequency modulation.Optionally, the present embodiment provides a kind of concrete form of default control function: F 1=F 2+ (△ T 1-△ T 2)/ξ.Wherein, F 1be the first operating frequency, △ T 1for the expection temperature difference.
(△ T 1-△ T 2)/ξ, the difference namely between the expection temperature difference and second temperature difference, and the ratio of coefficient of frequency modulation, this ratio represents, is (△ T for forming size 1-△ T 2) the indoor temperature difference, the second operating frequency basis needs introduce operating frequency variable quantity.That is, the first operating frequency can add that on the second operating frequency basis a frequency correction value obtains, and this frequency correction value size is (△ T 1-△ T 2)/ξ.
Certainly; be familiar with those skilled in the art; other default control function is obtained according to above parameter; or the default control function that embodiments of the invention provide is out of shape or substitute obtain the concrete form of new default control function, all should be encompassed within protection scope of the present invention.
105, at the first control cycle, compressor is according to described first operating frequency running.
Optionally, at the end of the adjacent last control cycle of the first control cycle, calculate the coefficient of frequency modulation that current time is corresponding, and determine the first operating frequency further, then when the first control cycle starts, operating frequency is adjusted to the first operating frequency.
The adjustment process of convertible frequency air-conditioner to room temperature comprises several control cycles, and the first control cycle can be arbitrary control cycle wherein.In other words, the control method of the convertible frequency air-conditioner that the present embodiment provides, can cycle applications in multiple control cycle.For different control cycle, by upgrading the expection temperature difference and coefficient of frequency modulation, new operating frequency can be obtained.
The control method of the convertible frequency air-conditioner that the present embodiment provides, by obtaining the expection temperature difference, second temperature difference, the second operating frequency and coefficient of frequency modulation, calculate the first operating frequency according to above parameter by default control function, and when the first control cycle starts, operating frequency is adjusted to the first operating frequency.The control method for the first control cycle provided by embodiments of the invention, cycle applications, in multiple control cycle, by the expection temperature difference and the coefficient of frequency modulation of renewal, obtains the operating frequency upgraded, completes the adjustment process to room temperature.For different control cycles, by to expection the temperature difference adjustment to make indoor temperature smooth variation, simultaneously by the renewal of coefficient of frequency modulation, when being reflected in different chamber's internal loading, the change of the indoor temperature caused by the change of operating frequency, thus the degree of accuracy that improve frequency modulation control.
Embodiment two
Based on embodiment one, the embodiment of the present invention two provides a kind of control method of convertible frequency air-conditioner, with reference to shown in Fig. 2, comprises the following steps:
201, control device obtains the 3rd temperature difference and the 3rd operating frequency.
202, the expection temperature difference, second temperature difference and the second operating frequency is obtained.
In a control cycle, when operating frequency is certain, indoor load is larger, and indoor temperature change generated in case is slower, and namely in this control cycle, the average rate of change of indoor temperature is less.Therefore, in a control cycle, due to the linear relationship between indoor load and the average rate of change of indoor temperature, the size of indoor load in this control cycle can be reflected by the average rate of change of indoor temperature.Further, the average rate of change of indoor temperature is less, and namely when air conditioner refrigerating ability is certain, the change of indoor temperature is slower, therefore expects that the concrete value of the temperature difference is also less.
Optionally, determine the average rate of change of indoor temperature in the second control cycle, and determine to expect the temperature difference according to the average rate of change.Wherein, the second control cycle is control cycle timeline is positioned at before the first control cycle.
Concrete, by preset function △ T 1=± | S*P 1* (△ T 2/ P 2) | calculate the expection temperature difference.Wherein, △ T 1for the expection temperature difference, P 1be the time span of the first control cycle, P 2be the time span of the second control cycle, △ T 2/ P 2be the average rate of change of indoor temperature in the second control cycle, S is default slope value, and S is not equal to 0.
Optionally, in the application scenarios that the time span of different control cycle is all equal, can also determine to expect the temperature difference according to the variable quantity of indoor temperature in the second control cycle.Preset function for calculating the expection temperature difference is specifically as follows: △ T 1=± | S* △ T 2|.
△ T 1can get on the occasion of, also can get negative value, determine △ T 1the principle of symbol is specially: if indoor temperature is lower than design temperature at the end of the second control cycle, △ T 1get on the occasion of, represent in the first control cycle need raise indoor temperature.If indoor temperature is higher than design temperature at the end of the second control cycle, △ T 1get negative value, represent in the first control cycle and need to reduce indoor temperature.
It should be noted that, determine △ T 1the principle of symbol and the mode of operation of air-conditioning have nothing to do, and no matter be heating mode or refrigeration mode, this principle is all applicable.Such as, in a heating mode, when indoor temperature is lower than design temperature, △ T 1get on the occasion of, then in the first control cycle, raise indoor temperature.Because air-conditioner continuous heats, indoor temperature may higher than design temperature, now △ T 1get negative value, then in the first control cycle, reduce indoor temperature.Equally, in cooling mode, when indoor temperature is higher than design temperature, △ T 1get negative value, then in the first control cycle, reduce indoor temperature, when indoor temperature is lower than design temperature, △ T 1get on the occasion of, then in the first control cycle, raise indoor temperature.
Further, after the expection temperature difference is determined, raise by carrying out adjustment to operating frequency or reduce indoor temperature, how to adjust the concrete of operating frequency, the present embodiment will be described for the first operating frequency in subsequent step.
203, coefficient of frequency modulation is obtained.
Coefficient of frequency modulation is used to indicate the indoor temperature difference of unit change amount caused by a control cycle of compressor operating frequency, concrete, the unit change amount of operating frequency can refer to 1 hertz, when then coefficient of frequency modulation refers to the change 1 hertz of operating frequency, the indoor temperature difference caused in a control cycle.
Concrete, obtain the 3rd temperature difference and the 3rd operating frequency.Wherein, 3rd temperature difference is the indoor temperature difference in the 3rd control cycle, 3rd operating frequency is operating frequency three control cycle of compressor in the 3rd control cycle is control cycle timeline is positioned at before the first control cycle, and is different control cycles from the second control cycle.
Second temperature difference, the second operating frequency, the 3rd temperature difference and the 3rd operating frequency are substituted into the first formula, determines coefficient of frequency modulation.First formula is specially: ξ=(△ T 2-△ T 3)/(F2-F3).Wherein, △ T 3be the 3rd temperature difference, F 3it is the 3rd operating frequency.
For the first control cycle, when calculating coefficient of frequency modulation, selecting different control cycles as the second control cycle and the 3rd control cycle, different values can be calculated.Preferably, be the second control cycle with the adjacent last control cycle of the first control cycle, be the 3rd control cycle with the adjacent last control cycle of the second control cycle, thus reflect the first variable quantity of operating frequency when controlling to start and relation of the indoor temperature difference more exactly.
For different control cycle, the different value of the coefficient of frequency modulation that can calculate, namely the concrete value of coefficient of frequency modulation can be real-time change.Preferably, before each control cycle starts, all calculate for this control cycle, obtain the coefficient of frequency modulation upgraded, and carry out subsequent calculations according to the coefficient of frequency modulation upgraded.
204, will expect and substitute into the temperature difference, second temperature difference, the second operating frequency and coefficient of frequency modulation default control function and calculate the first operating frequency.
Default control function is the function of the first operating frequency about the expection temperature difference, second temperature difference, the second operating frequency and coefficient of frequency modulation.Optionally, the present embodiment provides a kind of concrete form of default control function: F 1=F 2+ k (△ T 1-△ T 2)/ξ.Wherein, F 1be the first operating frequency, k is correction coefficient and k ≠ 0.Certainly, be familiar with those skilled in the art, according to above parameter default control function is out of shape or substitute obtain the concrete form of new default control function, all should be encompassed within protection scope of the present invention.
To according to default control function, the time dependent schematic diagram of indoor temperature shown in composition graphs 3, determines that the process of the first operating frequency is described.Especially, Figure 3 shows that indoor temperature change procedure in a heating mode, this control method not representing the convertible frequency air-conditioner that embodiments of the invention provide is only applicable to heating mode certainly, and the present invention does not limit for the mode of operation of convertible frequency air-conditioner.
In Fig. 3, transverse axis is time shaft, the time point t on transverse axis a, t b, t cetc. identifying, wherein, t abe 0 time point, the time point namely during air-conditioning start.Time span between adjacent two time points is a control cycle, and the time span of different control cycle can be identical or different, Figure 3 shows that the situation that different control cycle time span is identical.In Fig. 3, the longitudinal axis is temperature axis, W 0for design temperature.
In below illustrating, for ease of describing, to t ato t bbetween control cycle P barepresent, P bainterior operating frequency F barepresent, by that analogy.Use W a, W brepresent t respectively atime point and t bthe each self-corresponding indoor temperature of time point, by that analogy.
At P bain, F bafor initial operating frequency when air-conditioning is started shooting.
With P cbwhen being the first control cycle, with P babe the second control cycle, at t btime point calculates: expection temperature difference △ T 1=± | S*P 1* (△ T 2/ P 2) |, coefficient of frequency modulation ξ=(△ T 2-△ T 3)/(F2-F3), wherein, △ T 3and F 3be 0.Then, by default control function F 1=F 2+ k (△ T 1-△ T 2)/ξ calculates the first operating frequency.
It should be noted that, for ease of illustrating, in the present embodiment, calculating △ T respectively 1and ξ, and calculate F further 1.In the frequency adjustment procedure of reality, △ T can be calculated respectively 1and ξ, then calculate F 1, but obtain F by whole parameter is substituted into final formulae discovery 1, to reduce the rounding error brought when calculating intermediate object program.
With P dcwhen being the first control cycle, with P cbbe the second control cycle, with P babe the 3rd control cycle, at t ctime point calculates, by that analogy.
It should be noted that, at t b, t cand t dtime point, because indoor temperature is lower than design temperature, therefore at calculating F 1time △ T 1get on the occasion of.And at t etime point, because indoor temperature exceedes design temperature, therefore at calculating F 1time △ T 1get negative value.In follow-up control cycle, continue to determine △ T according to the magnitude relationship between indoor temperature and design temperature 1symbol.
When indoor temperature is gradually close to design temperature, indoor temperature fluctuates up and down at design temperature and is stabilized in design temperature gradually.
Preferably, for default control function F 1=F 2+ k (△ T 1-△ T 2the value of the correction coefficient k in)/ξ, k can basis | △ T 2| size adjust, as | △ T 2| when being more than or equal to the second predetermined threshold value, the value of k is more than or equal to 1, when | △ T 2| when being less than the second predetermined threshold value, the value of k is less than 1.Wherein, the value of the second predetermined threshold value, is specifically as follows the accuracy value of temperature sensor, or the multiple of this accuracy value.Wherein temperature sensor is the sensor for measuring indoor temperature.
Concrete, shown in associative list 2, in a kind of concrete application scenarios, the second predetermined threshold value is 0.3 degree Celsius.The time span of different control cycle can be different, and table two is depicted as the situation that control cycle is A minute, and different control cycle was distinguished by the time, and wherein 0 time point is the time point that air-conditioning receives temperature adjustment instruction.
Within M (being specially 3 in table 2) the individual continuous control cycle that air-conditioning has just been started shooting, because the temperature difference of now design temperature and actual indoor temperature is maximum, thus in this M control cycle in each control cycle the variable quantity of indoor temperature larger.Now, F is calculated using the arbitrary control cycle in this M control cycle as the second control cycle 1time, the value of k is greater than 1.In the individual continuous print control cycle of N (being specially 4 in table 2) subsequently, k equals 1.After M+N control cycle, indoor temperature gradually close to design temperature, △ T 2gradually reduce, now calculate the F of gained 1also gradually close to F 2.Therefore as △ T 2when being less than or equal to the second predetermined threshold value, the value of k is less than 1.Thus when indoor temperature is close to design temperature, by adjusting the value of k to F 1and F 2difference portion (k (△ T 1-△ T 2)/ξ) size finely tune, to improve the control accuracy to operating frequency, make the change of indoor temperature milder.
205, when within benchmark room temperature is between the first room-temperature zone, determine to expect the temperature difference according to ping-pang storage algorithm.
When indoor temperature is gradually close to design temperature, indoor temperature fluctuates up and down at design temperature and is stabilized in design temperature gradually.When indoor temperature is close to design temperature, for making indoor temperature smooth variation, improve the control accuracy to operating frequency, the present embodiment determines to expect the temperature difference according to ping-pang storage algorithm, and calculates the first operating frequency further.Wherein ping-pang storage algorithm refers to, when indoor temperature is close to design temperature, reduces to the adjusting range of operating frequency to make the control algolithm of indoor temperature smooth change, namely to the control algolithm that indoor temperature is finely tuned.
It should be noted that, here the fine setting of indication, comprise readjustment when indoor temperature exceedes design temperature.Indoor temperature exceedes design temperature and refers to, indoor temperature is higher than design temperature in a heating mode, and indoor temperature is lower than design temperature in cooling mode.When indoor temperature exceedes design temperature, the first operating frequency calculated by ping-pang storage algorithm, may be less than the second operating frequency, thus plays the effect of readjustment room temperature.
Ping-pang storage algorithm is triggered for determining when between the first room-temperature zone.Concrete, after indoor temperature enters between the first room-temperature zone first, namely start to adopt ping-pang storage algorithm.Optionally, between the first room-temperature zone be the closed interval of to take design temperature as the length of median be the first predetermined threshold value.Represent the first predetermined threshold value with 2Ea, indoor temperature belongs between the first room-temperature zone and refers to, indoor temperature is more than or equal to W 0-Ea and be less than or equal to W 0+ Ea.Wherein W 0for design temperature.
To determining according to ping-pang storage algorithm, the time dependent schematic diagram of indoor temperature shown in composition graphs 4, expects that the detailed process of the temperature difference is described below by way of step 2051-step 2052.In Fig. 4, transverse axis is time shaft, and the longitudinal axis is temperature axis, and the minimum of a value on the longitudinal axis between the first room-temperature zone is W 0-Ea, the maximum between the first room-temperature zone is W 0+ Ea.
2051, benchmark room temperature is obtained.
Wherein, benchmark room temperature is the indoor temperature at the end of the adjacent last control cycle of the first control cycle.If benchmark room temperature between the first room-temperature zone within, then perform step 2052, if not, then skip whole step 205.
Composition graphs 4, with P edwhen being the first control cycle, P edadjacent last control cycle be P dc, benchmark room temperature is P dcat the end of indoor temperature, i.e. t dthe indoor temperature W of time point d.Due to W 0-Ea≤W d≤ W 0+ Ea, then perform step 2052.
2052, the difference of benchmark room temperature is subtracted with target temperature for the expection temperature difference.
Wherein, target temperature belongs between the first room-temperature zone.
When benchmark room temperature does not reach design temperature, target temperature equals design temperature, and when benchmark room temperature exceedes design temperature, target temperature is set to the value not reaching design temperature.
Do not reach design temperature to refer to, indoor temperature is lower than design temperature in a heating mode, or in cooling mode indoor temperature higher than design temperature.
Exceed design temperature to refer to, indoor temperature is higher than design temperature in a heating mode, or in cooling mode indoor temperature lower than design temperature.
With W 1represent target temperature, W 2represent benchmark room temperature, then expection temperature difference △ T 1=W 1-W 2.
In cooling mode, when benchmark room temperature is greater than design temperature, target temperature equals design temperature, and when benchmark room temperature is less than design temperature, target temperature is greater than design temperature.
Work as W 2be less than W 0+ Ea and be greater than W 0time, indoor temperature higher than setting value, now by W 1value be set to W 0, have W 1< W 2, △ T 1be negative, represent and reduce indoor temperature in the first control cycle, to make indoor temperature close to design temperature.
Work as W 2be less than W 0and be greater than W 0during-Ea, indoor temperature lower than setting value, now by W 1value be set to and be greater than W 0and be less than W 0the value of+Ea, has W 1> W 2, △ T 1for just, representing and in the first control cycle, raising indoor temperature, to make indoor temperature close to design temperature.
In a heating mode, when benchmark room temperature is less than design temperature, target temperature equals design temperature, and when benchmark room temperature is greater than design temperature, target temperature is less than design temperature.
Work as W 2be greater than W 0-Ea and be less than W 0time, indoor temperature lower than setting value, now by W 1value be set to W 0, have W 1> W 2, △ T 1for just, representing and in the first control cycle, raising indoor temperature, to make indoor temperature close to design temperature.
Work as W 2be greater than W 0and be less than W 0during+Ea, indoor temperature higher than setting value, now by W 1value be set to and be less than W 0and be greater than W 0the value of-Ea, has W 1< W 2, △ T 1be negative, represent and reduce indoor temperature in the first control cycle, to make indoor temperature close to design temperature.
Be explained above refrigeration mode and heating mode and divide into difference when setting the goal temperature, after determine the expection temperature difference according to target temperature, determine that the computational process of the first operating frequency is identical further, below in conjunction with Fig. 4, for determining under heating mode that the process of operating frequency is described further, under refrigeration mode, determine that the process of operating frequency repeats no more.
At t dtime point, W 2=W d, be greater than W 0-Ea and be less than W 0, corresponding W 1value is W 0, then △ T 1=W 0-W d.Further, △ T is being determined 1afterwards, according to default control function F 1=F 2+ k (△ T 1-△ T 2)/ξ calculates F 1.Wherein, the computational process when computational process of ξ is not interior in the first room-temperature zone with indoor temperature is identical, repeats no more herein.
Composition graphs 4, at t etime point, W 2=W e, be greater than W 0and be less than W 0+ Ea, corresponding W 1be greater than W 0-Ea and be less than W 0.Such as, target temperature is specially W 0-Ea/2, then △ T 1=(W 0-Ea/2)-W e.Optionally, W is greater than at target temperature 0-Ea and be less than W 0condition under, when benchmark room temperature is more close to design temperature, target temperature also more close to design temperature, now △ T 1absolute value also gradually close to 0 value, F 1with F 2between difference gradually close to 0 value, the change of indoor temperature in a control cycle also will be worth by convergence 0 gradually, and be stabilized in design temperature gradually.
Due to F 1with F 2between difference gradually close to 0 value, may need after more than one control cycle, indoor temperature could from lower than design temperature gradually to exceeding design temperature, or from exceeding design temperature gradually to lower than design temperature.
Optionally, with reference to table two, when indoor temperature is close to design temperature, larger change is there is for exempting from indoor temperature in the first control cycle, the difference of indoor temperature and design temperature is caused to become large on the contrary, when second temperature difference is less than or equal to the second predetermined threshold value, to default control function F 1=F 2+ k (△ T 1-△ T 2correction coefficient k in)/ξ adjusts, and makes k be less than 1, thus improves the frequency modulation degree of accuracy, makes the change of indoor temperature milder.
Or, as △ T in continuous print two control cycles 1not during reversion, the value of correction coefficient k is adjusted to and is less than 1, same by improving the frequency modulation degree of accuracy to make the change of indoor temperature milder.Composition graphs 4, at t fand t gtime point △ T 1all be less than 0, if t gthe value of time point k is greater than or equal to 1, easily makes at P gfinterior indoor temperature change generated in case is excessive, therefore at t gthe value that time point reduces k can make P gfthe change of interior indoor temperature is milder.
Description to ping-pang storage algorithm in integrating step 2051 and step 2052, illustrates herein further.The change procedure of indoor temperature under heating mode shown in composition graphs 4, at t ontime point indoor temperature reaches design temperature, t ontime point is at P dcin cycle.At t onbefore time point, indoor temperature lower than design temperature, therefore at t on(P is comprised in control cycle before time point dc), without the need to triggering ping-pang storage algorithm.P dceach control cycle afterwards, calculates the operating frequency of compressor by ping-pang storage algorithm.
From P dcfirst control cycle, i.e. P afterwards decycle, setting △ T 1=△ T 2, make F 1=F 2+ k (△ T 1-△ T 2)/ξ=F 2, namely maintenance work frequency is constant, until indoor temperature exceedes design temperature W 0, as t in Fig. 4 eshown in time point.
Calculating next control cycle (be P in Fig. 4 fe) operating frequency time, target temperature is set to W 0-Ea, and the value of correction coefficient k is set to 1, the operating frequency now calculating next control cycle of gained is less than the operating frequency of an adjacent upper control cycle, and namely operating frequency reduces.
If P fein cycle, indoor temperature does not decline, then at calculating P fenext cycle in cycle (is P in Fig. 4 gfcycle) operating frequency time, the value of correction coefficient k is set to 0.9, or further reduces the value of k, until indoor temperature starts to reduce.
After room temperature starts reduction, maintenance work frequency is constant, until indoor temperature is reduced to design temperature W 0(be P in Fig. 4 below igin cycle), now target temperature is set to W 0+ Ea/2, the operating frequency now calculating next control cycle of gained is greater than the operating frequency of an adjacent upper control cycle, and namely operating frequency raises.
Calculating next control cycle (be P in Fig. 4 jicycle) in operating frequency time, if indoor temperature is at (W 0-Ea, W 0) interval interior (t as shown in Figure 4 itime point), then the value of correction coefficient k is set to 0.8; If indoor temperature is to be reduced to W 0below-Ea, be then set to 0.7 by the value of correction coefficient k, to reduce the amplitude of accommodation of operating frequency.
If P jiin cycle, indoor temperature does not rise, then can increase the value of correction coefficient k, until indoor temperature rises.Preferably, the adjustment step-length (< 0.1) to correction coefficient k can be reduced, to improve degree of regulation.If P jiin cycle, indoor temperature starts to rise, then maintenance work frequency is constant, until indoor temperature is elevated to design temperature W again 0above.
Composition graphs 4, t eduring time point, indoor temperature first time exceedes design temperature W 0, at t efirst control cycle after time point, target temperature is set to W 0-Ea.When indoor temperature exceedes design temperature W again 0time, target temperature is set to and is less than W 0simultaneously than W 0-Ea is closer to W 0value, such as W 0-Ea/2, the simultaneously value of further correction for reduction coefficient k.
More to control cycle below, target temperature is more close to design temperature W 0, simultaneously the value of correction coefficient k is also more close to 0, then in adjacent two control cycles calculating gained, the difference of operating frequency is more close to 0, namely more and more less to the amplitude of accommodation of operating frequency.Meanwhile, indoor temperature is more close to design temperature W 0, and shock range is more close to 0.Final indoor temperature and operating frequency all reach stable state, only finely tune operating frequency according to the variation of indoor temperature when needed.
206, at the first control cycle, compressor is according to described first operating frequency running.
207, indoor set wind speed is adjusted.
While execution step 206 pair operating frequency adjusts, according to the first operating frequency, indoor set wind speed is adjusted, to ensure Indoor Thermal exchange efficiency.Concrete, in the first control cycle, according to the first operating frequency adjustment indoor set wind speed, wherein, indoor set wind speed and the linear positive correlation of the first operating frequency.Namely, when operating frequency is higher, corresponding indoor set wind speed is higher.
208, off-premises station wind speed is adjusted.
Can adjust off-premises station wind speed according to the size of the average rate of change absolute value of indoor temperature.Average rate of change absolute value is less, and represent that indoor temperature change generated in case is slower, now corresponding wind speed is larger.
Concrete, determine the average rate of change absolute value of indoor temperature in the second control cycle | △ T 2/ T|, while execution step 206 pair operating frequency adjusts, in the first control cycle, according to average rate of change adjustment off-premises station wind speed.Wherein, off-premises station wind speed is relevant to the average rate of change linear negative of indoor temperature in the second control cycle.Namely | △ T 2/ T| is less, and represent that indoor load is larger, corresponding off-premises station wind speed is higher.
Adjustment to indoor set wind speed and off-premises station wind speed and the adjustment to operating frequency are synchronously carried out, and step 206 does not have sequencing to 208.
In addition, the wind speed of indoor set or off-premises station can comprise multiple gear from minimum wind speed to highest wind velocity, this sentence to one of them gear be adjusted to example the control of wind speed is described.If setting rotation speed of fan when operating frequency increases above critical value increases by one grade, when operating frequency be reduced to be less than this critical value time rotation speed of fan reduce one grade, then when operating frequency is in the upper and lower frequent fluctuation of this critical value, to the rotating speed of blower fan be caused frequently to switch back and forth between two gears, the method therefore adopting return difference to control regulates rotation speed of fan.Concrete, setting return difference frequency, when operating frequency increases above critical value, rotation speed of fan increases by one grade, keep rotation speed of fan constant when operating frequency is reduced to and is less than this critical value, when operating frequency is low in this enterprising step-down in critical value basis, and when the difference reduced exceedes return difference frequency, rotation speed of fan is reduced by one grade, thus avoid the problem because operating frequency frequently switches at the rotation speed of fan that critical value place frequent fluctuation causes.
The control method of the convertible frequency air-conditioner that the present embodiment provides, by obtaining the expection temperature difference, second temperature difference, the second operating frequency and coefficient of frequency modulation, calculate the first operating frequency according to above parameter by default control function, and when the first control cycle starts, operating frequency is adjusted to the first operating frequency.The control method for the first control cycle provided by embodiments of the invention, cycle applications, in multiple control cycle, by the expection temperature difference and the coefficient of frequency modulation of renewal, obtains the operating frequency upgraded, completes the adjustment process to room temperature.For different control cycles, by to expection the temperature difference adjustment to make indoor temperature smooth variation, simultaneously by the renewal of coefficient of frequency modulation, when being reflected in different chamber's internal loading, the change of the indoor temperature caused by the change of operating frequency, thus the degree of accuracy that improve frequency modulation control.Especially, when indoor temperature is close to design temperature, determine to expect the temperature difference by ping-pang storage algorithm, and further by the adjustment to correction coefficient in default control function, the degree of accuracy of further raising frequency modulation control, to make indoor temperature more gently close to design temperature, thus improve the comfort level of user.
Embodiment three
Based on embodiment one and embodiment two, embodiments of the invention three provide a kind of control device of convertible frequency air-conditioner, and for performing the control method of the convertible frequency air-conditioner described in embodiment one and embodiment two, with reference to Fig. 5, the control device 50 of convertible frequency air-conditioner comprises:
Control unit 501, control unit 501 comprises acquisition module 5011 and setting module 5012.Acquisition module 5011, for obtaining the 3rd temperature difference, the 3rd operating frequency.Wherein, the 3rd temperature difference is the indoor temperature difference formed in the 3rd control cycle, and the 3rd operating frequency is the operating frequency of compressor in the 3rd control cycle.Acquisition module 5011, also for obtaining second temperature difference and the second operating frequency.Wherein, second temperature difference is the indoor temperature difference formed in the second control cycle, and the second operating frequency is the operating frequency of compressor in the second control cycle.Second control cycle is timeline is positioned at the control cycle after the 3rd control cycle.Setting module 5012, for obtaining the expection temperature difference.The indoor temperature difference of the expection temperature difference for being formed in the first control cycle, the first control cycle is control cycle timeline is positioned at after the second control cycle.Setting module 5012, also for obtaining coefficient of frequency modulation, coefficient of frequency modulation is determined according to second temperature difference, the second operating frequency, the 3rd temperature difference and the 3rd operating frequency by setting module 5012.
Arithmetic element 502, for according to the expection temperature difference, second temperature difference, the second operating frequency and coefficient of frequency modulation, determines the first operating frequency.
Adjustment unit 503, at the first control cycle, controls compressor and operates according to the first operating frequency.
Optionally, arithmetic element 502, specifically for expecting the temperature difference, second temperature difference, the second operating frequency and coefficient of frequency modulation, will substitute into following default control function: F 1=F 2+ k (△ T 1-△ T 2)/ξ, determines the first operating frequency.
Wherein, F 1be the first operating frequency, F 2be the second operating frequency, △ T 1for the expection temperature difference, △ T 2be second temperature difference, ξ is coefficient of frequency modulation, and k is correction coefficient and k ≠ 0.
Optionally, when arithmetic element 502 determines that the absolute value of second temperature difference is more than or equal to the second predetermined threshold value, arithmetic element 502, is also more than or equal to 1 for setting correction coefficient.
When arithmetic element 502 determines that the absolute value of second temperature difference is less than the second predetermined threshold value, arithmetic element 502, is also less than 1 for setting correction coefficient.
Optionally, setting module 5012, specifically for the value according to parameter preset in the second control cycle, search expection temperature difference table and obtain the expection temperature difference, expection temperature difference table is used to indicate the mapping relations between the value of parameter preset and expection temperature difference value, and wherein parameter preset is the ratio of the second operating frequency and second temperature difference.
Optionally, acquisition module 5011, also for determining the variable quantity of indoor temperature in the average rate of change of indoor temperature in the second control cycle or the second control cycle.
Setting module 5012, also determines to expect the temperature difference for the average rate of change determined according to acquisition module 5011 or variable quantity.
Optionally, acquisition module 5011, also for obtaining benchmark room temperature, benchmark room temperature is the indoor temperature at the end of the adjacent last control cycle of the first control cycle.
Setting module 5012, also for when within benchmark room temperature is between the first room-temperature zone, determines to expect the temperature difference according to ping-pang storage algorithm.Wherein, between the first room-temperature zone be the closed interval of to take design temperature as the length of median be the first predetermined threshold value.
In a heating mode, optionally, setting module 5012, specifically for the difference of target temperature and benchmark room temperature for expection the temperature difference, target temperature belongs between the first room-temperature zone.
Setting module 5012, also for when benchmark room temperature is less than design temperature, setting target temperature equals design temperature.
Setting module 5012, also for when benchmark room temperature is greater than design temperature, setting target temperature is less than design temperature.
Optionally, acquisition module 5011, for being the second control week with the adjacent last control cycle of the first control cycle is also.
Acquisition module 5011, also for being the 3rd control cycle with the adjacent last control cycle of the second control cycle.
Optionally, adjustment unit 503, also in the first control cycle, according to the first operating frequency adjustment indoor set wind speed.
Wherein, indoor set wind speed and the linear positive correlation of the first operating frequency.
Optionally, acquisition module 5011, also for determining the average rate of change of indoor temperature in the second control cycle.
Adjustment unit 503, also for adjusting off-premises station wind speed according to the average rate of change, wherein, off-premises station wind speed is relevant to average rate of change linear negative.
The control device of the convertible frequency air-conditioner that the present embodiment provides, by obtaining the expection temperature difference, second temperature difference, the second operating frequency and coefficient of frequency modulation, calculate the first operating frequency according to above parameter by default control function, and when the first control cycle starts, operating frequency is adjusted to the first operating frequency.Control device is by the control method for the first control cycle, and cycle applications, in multiple control cycle, by the expection temperature difference and the coefficient of frequency modulation of renewal, obtains the operating frequency upgraded, completes the adjustment process to room temperature.For different control cycles, by to expection the temperature difference adjustment to make indoor temperature smooth variation, simultaneously by the renewal of coefficient of frequency modulation, when being reflected in different chamber's internal loading, the change of the indoor temperature caused by the change of operating frequency, thus the degree of accuracy that improve frequency modulation control.Especially, when indoor temperature is close to design temperature, determine to expect the temperature difference by ping-pang storage algorithm, and further by the adjustment to correction coefficient in default control function, the degree of accuracy of further raising frequency modulation control, to make indoor temperature more gently close to design temperature, thus improve the comfort level of user.
Embodiments of the invention also provide a kind of convertible frequency air-conditioner, comprise the control device of the convertible frequency air-conditioner described in embodiment three, convertible frequency air-conditioner, by improving the degree of accuracy of frequency modulation control, to make indoor temperature more gently close to design temperature, thus improves the comfort level of user.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention can use hardware implementing, or firmware realizes, or their combination realizes.When implemented in software, above-mentioned functions can be stored in computer-readable medium or as the one or more instruction on computer-readable medium or code and transmit.Computer-readable medium comprises computer-readable storage medium and communication media, and wherein communication media comprises any medium being convenient to transmit computer program from a place to another place.Storage medium can be any usable medium that computer can access.As example but be not limited to: computer-readable medium can comprise random access memory (English full name: RandomAccessMemory, English abbreviation: RAM), read-only storage (English full name: ReadOnlyMemory, English abbreviation: ROM), EEPROM (English full name: ElectricallyErasableProgrammableReadOnlyMemory, English abbreviation: EEPROM), read-only optical disc (English full name: CompactDiscReadOnlyMemory, English abbreviation: CD-ROM) or other optical disc storage, magnetic disk storage medium or other magnetic storage apparatus, or the program code that can be used in carrying or storing the expectation with instruction or data structure form also can by any other medium of computer access.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should described be as the criterion with the protection domain of claim.

Claims (21)

1. a control method for convertible frequency air-conditioner, is characterized in that, comprising:
Obtain the 3rd temperature difference, the 3rd operating frequency; Wherein, described 3rd temperature difference is the indoor temperature difference formed in the 3rd control cycle, and described 3rd operating frequency is the operating frequency of compressor in the 3rd control cycle; Obtain second temperature difference, the second operating frequency and the expection temperature difference; Wherein, described second temperature difference is the indoor temperature difference formed in the second control cycle, described second operating frequency is the operating frequency of compressor in described second control cycle, the indoor temperature difference of the described expection temperature difference for being formed in the first control cycle, described second control cycle be timeline is positioned at described 3rd control cycle after and the control cycle be positioned at before described first control cycle; Obtain coefficient of frequency modulation, described coefficient of frequency modulation is determined by described second temperature difference, described second operating frequency, described 3rd temperature difference and described 3rd operating frequency;
According to the described expection temperature difference, described second temperature difference, described second operating frequency and described coefficient of frequency modulation, determine the first operating frequency;
At the first control cycle, compressor is according to described first operating frequency running.
2. method according to claim 1, is characterized in that,
Described by the described expection temperature difference, described second temperature difference, described second operating frequency and described coefficient of frequency modulation, substitute into default control function, determine that the first operating frequency comprises:
By the described expection temperature difference, described second temperature difference, described second operating frequency and described coefficient of frequency modulation, substitute into following default control function: F 1=F 2+ k (△ T 1-△ T 2)/ξ, determines the first operating frequency;
Wherein, F 1be the first operating frequency, F 2be the second operating frequency, △ T 1for the expection temperature difference, △ T 2be second temperature difference, ξ is coefficient of frequency modulation, and k is correction coefficient and k ≠ 0.
3. method according to claim 2, is characterized in that,
When the absolute value of described second temperature difference is more than or equal to the second predetermined threshold value, described correction coefficient is more than or equal to 1;
When the absolute value of described second temperature difference is less than described second predetermined threshold value, described correction coefficient is less than 1.
4. method according to claim 2, is characterized in that, the described acquisition expection temperature difference comprises:
According to the value of parameter preset in described second control cycle, search expection temperature difference table and obtain the described expection temperature difference, described expection temperature difference table is used to indicate the mapping relations between the value of described parameter preset and described expection temperature difference value, and wherein said parameter preset is the ratio of described second operating frequency and described second temperature difference.
5. method according to claim 2, is characterized in that,
Described method also comprises: the variable quantity determining indoor temperature in the average rate of change of indoor temperature in described second control cycle or described second control cycle;
The described acquisition expection temperature difference comprises: determine the described expection temperature difference according to the described average rate of change or described variable quantity.
6. method according to claim 2, is characterized in that,
Described method also comprises: obtain benchmark room temperature, described benchmark room temperature is the indoor temperature at the end of the adjacent last control cycle of described first control cycle;
The described acquisition expection temperature difference comprises: when within described benchmark room temperature is between the first room-temperature zone, determines the described expection temperature difference according to ping-pang storage algorithm; Wherein, between described first room-temperature zone be the closed interval of to take design temperature as the length of median be the first predetermined threshold value.
7. method according to claim 6, is characterized in that, in a heating mode, describedly determines the described expection temperature difference according to ping-pang storage algorithm, comprising:
Be the described expection temperature difference with the difference of target temperature and described benchmark room temperature, described target temperature belongs between described first room-temperature zone;
When described benchmark room temperature is less than described design temperature, described target temperature equals described design temperature;
When described benchmark room temperature is greater than described design temperature, described target temperature is less than described design temperature.
8. the method according to any one of claim 1-7, is characterized in that,
Described second control cycle is the adjacent last control cycle of described first control cycle;
Described 3rd control cycle is the adjacent last control cycle of described second control cycle.
9. the method according to any one of claim 1-7, is characterized in that, described method also comprises:
In described first control cycle, according to the first operating frequency adjustment indoor set wind speed;
Wherein, indoor set wind speed and the linear positive correlation of described first operating frequency.
10. the method according to any one of claim 1-7, is characterized in that, described method also comprises:
Determine the average rate of change of indoor temperature in described second control cycle;
According to described average rate of change adjustment off-premises station wind speed, wherein, off-premises station wind speed is relevant to described average rate of change linear negative.
The control device of 11. 1 kinds of convertible frequency air-conditioners, is characterized in that, comprising:
Control unit, described control unit comprises acquisition module and setting module; Described acquisition module, for obtaining the 3rd temperature difference, the 3rd operating frequency; Wherein, described 3rd temperature difference is the indoor temperature difference formed in the 3rd control cycle, and described 3rd operating frequency is the operating frequency of compressor in the 3rd control cycle; Described acquisition module, also for obtaining second temperature difference and the second operating frequency; Wherein, described second temperature difference is the indoor temperature difference formed in the second control cycle, and described second operating frequency is the operating frequency of compressor in described second control cycle; Described second control cycle is timeline is positioned at the control cycle after described 3rd control cycle; Described setting module, for obtaining the expection temperature difference; The indoor temperature difference of the described expection temperature difference for being formed in the first control cycle, described first control cycle is timeline is positioned at the control cycle after described second control cycle; Described setting module, also for obtaining coefficient of frequency modulation, described coefficient of frequency modulation is determined according to described second temperature difference, described second operating frequency, described 3rd temperature difference and described 3rd operating frequency by described setting module;
Arithmetic element, for according to the described expection temperature difference, described second temperature difference, described second operating frequency and described coefficient of frequency modulation, determines the first operating frequency;
Adjustment unit, at the first control cycle, controls compressor according to described first operating frequency running.
12. control device according to claim 11, is characterized in that,
Described arithmetic element, specifically for by the described expection temperature difference, described second temperature difference, described second operating frequency and described coefficient of frequency modulation, substitutes into following default control function: F 1=F 2+ k (△ T 1-△ T 2)/ξ, determines the first operating frequency;
Wherein, F 1be the first operating frequency, F 2be the second operating frequency, △ T 1for the expection temperature difference, △ T 2be second temperature difference, ξ is coefficient of frequency modulation, and k is correction coefficient and k ≠ 0.
13. control device according to claim 12, is characterized in that,
When described arithmetic element determines that the absolute value of described second temperature difference is more than or equal to the second predetermined threshold value, described arithmetic element, is also more than or equal to 1 for setting described correction coefficient;
When described arithmetic element determines that the absolute value of described second temperature difference is less than described second predetermined threshold value, described arithmetic element, is also less than 1 for setting described correction coefficient.
14. control device according to claim 12, is characterized in that,
Described setting module, specifically for the value according to parameter preset in described second control cycle, search expection temperature difference table and obtain the described expection temperature difference, described expection temperature difference table is used to indicate the mapping relations between the value of described parameter preset and described expection temperature difference value, and wherein said parameter preset is the ratio of described second operating frequency and described second temperature difference.
15. control device according to claim 12, is characterized in that,
Described acquisition module, also for determining the variable quantity of indoor temperature in the average rate of change of indoor temperature in described second control cycle or described second control cycle;
Described setting module, also determines the described expection temperature difference for the described average rate of change determined according to described acquisition module or described variable quantity.
16. control device according to claim 12, is characterized in that,
Described acquisition module, also for obtaining benchmark room temperature, described benchmark room temperature is the indoor temperature at the end of the adjacent last control cycle of described first control cycle;
Described setting module, also for when within described benchmark room temperature is between the first room-temperature zone, determines the described expection temperature difference according to ping-pang storage algorithm; Wherein, between described first room-temperature zone be the closed interval of to take design temperature as the length of median be the first predetermined threshold value.
17. control device according to claim 16, is characterized in that, in a heating mode,
Described setting module, specifically for being the described expection temperature difference with the difference of target temperature and described benchmark room temperature, described target temperature belongs between described first room-temperature zone;
Described setting module, also for when described benchmark room temperature is less than described design temperature, sets described target temperature and equals described design temperature;
Described setting module, also for when described benchmark room temperature is greater than described design temperature, sets described target temperature and is less than described design temperature.
18. control device according to any one of claim 11-17, is characterized in that,
Described acquisition module, for taking the adjacent last control cycle of described first control cycle as described second control week is also;
Described acquisition module, also for taking the adjacent last control cycle of described second control cycle as described 3rd control cycle.
19. control device according to any one of claim 11-17, is characterized in that,
Described adjustment unit, also in described first control cycle, according to the first operating frequency adjustment indoor set wind speed;
Wherein, indoor set wind speed and the linear positive correlation of described first operating frequency.
20. control device according to any one of claim 11-17, is characterized in that,
Described acquisition module, also for determining the average rate of change of indoor temperature in described second control cycle;
Described adjustment unit, also for adjusting off-premises station wind speed according to the described average rate of change, wherein, off-premises station wind speed is relevant to described average rate of change linear negative.
21. 1 kinds of convertible frequency air-conditioners, is characterized in that, comprise the control device as described in any one of claim 11-20.
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