CN102748275A - Frequency boundary control method for variable-frequency air conditioner compressor - Google Patents
Frequency boundary control method for variable-frequency air conditioner compressor Download PDFInfo
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Abstract
The invention discloses a frequency boundary control method for a variable-frequency air conditioner compressor. The method comprises the following steps of (1) detecting a maximum working frequency F1 of the compressor by taking upper limit value deltaT of temperature rise of a controller as constraint condition; (2) detecting a maximum working frequency F2 of the compressor by taking upper limit value deltaP of allowable working pressure of the compressor as constraint condition; (3) comparing F1 with F2 to obtain a smaller value F3; (4) simplifying and fitting F3 according to linear function relationship to obtain a function relationship curve F4 of the maximum working frequency of the compressor and the outdoor ambient temperature in the outdoor ambient temperature interval T; and (5) determining a function relationship curve Fmax of the maximum working frequency of the compressor and the outdoor ambient temperature as well as the input voltage value. According to the frequency boundary control method for the variable-frequency air conditioner compressor, the working frequency of the compressor is reset through the introduction of the outdoor ambient temperature and the input variable of the input voltage of the air-conditioner, the boundary is widened, and the reliability of the compressor and the electronic control is fully ensured.
Description
Technical field
The present invention relates to a kind of transducer air conditioning compressor frequency boundary Control method, belong to the frequency converting air conditioner technical field.
Background technique
Traditional transducer air conditioning compressor operating frequency boundary is a fixed value, referring to shown in Figure 1, is the maximum running frequency figure of existing transducer air conditioning compressor; Be theoretical highest frequency; Not have function related with parameters such as outdoor environment temperature, input voltages, only is single edge frequency value, and actual motion is according to parameter adjustments such as delivery temperature, electric currents; Very low at some operating mode lower frequency; And ELV down even Control Parameter is conservative, can not avoid compressor operating pressure to exceed standard and automatically controlled temperature rise exceeds standard, ELV is impaired maybe.
When frequency converting air conditioner freezed, outdoor environment temperature was high more, and the maximum operating pressure of compressor can surpass Compressor Technology specifications set upper limit value through regular meeting and exceed standard; And unfavorable more to the heat radiation of automatically controlled components and parts, particularly the core parts IPM module (SPM) of the outdoor control of frequency converting air conditioner, PFC (PFC) are unfavorable, and IPM module own, PFC also produce heat.If the simultaneous low voltage, low voltage causes that the outdoor fan rotating speed descends, the refrigeration system load is bigger, causes compressor operating pressure to exceed standard more easily, causes IPM module, PFC heat radiation more unfavorable.Conventional domestic variable frequency air-conditioning is in order to guarantee compressor and automatically controlled operational safety; Be provided with delivery temperature protection control, anti-freeze protection control, antioverloading protection control, current protection control etc. during refrigeration; These are controlled at whole process of refrigerastion and are omnidistance Control Parameter; Like this in order to protect when refrigeration worst hot case and the automatically controlled especially IPM module of air-conditioning system reliability of operation of low voltage, the reliability of PFC and the reliability of compressor; Control Parameter protection value settings such as general electric current are comparatively conservative, otherwise some specific bad working environments or abnormal failure, will cause the compressor can not reliable operation even damage; Automatically controlled components and parts such as power model, PFC etc. very easily temperature rise are too high and breakdown, and the total failare rate of product is high.Must cause the compressor frequency boundary setting on the low side like this, peak frequency is limited bigger, and the performance of maximum refrigerating capacity is not come out, and the requirement that reaches setting temperature with the frequency changer fast-refrigerating, fast is not inconsistent.
Summary of the invention
The present invention is a fixed value in order to solve existing transducer air conditioning compressor operating frequency boundary, cause compressor operating pressure to exceed standard easily, and the compressor frequency boundary setting is on the low side; Peak frequency is limited bigger; Maximum refrigerating capacity performance is not come out, and to the disadvantageous problem of the heat radiation of automatically controlled components and parts, a kind of transducer air conditioning compressor frequency boundary Control method is provided; Under the prerequisite that satisfies compressor operating reliability and automatically controlled operational reliability; The setting of compressor operating frequency boundary is wideer, and under new frequency boundary, compressor and automatically controlled reliability can guarantee fully.
In order to solve the problems of the technologies described above, the present invention adopts following technological scheme to be achieved:
A kind of transducer air conditioning compressor frequency boundary Control method may further comprise the steps:
(1), the temperature rise CLV ceiling limit value △ T of setting controller, be restrictive condition with △ T, in the interval T of certain outdoor environment temperature, detect the maximum operation frequency F1 of pairing compressor under the different outdoor environment temperatures;
(2), set compressor and allow operating pressure CLV ceiling limit value △ P, and be restrictive condition with △ P, in the interval T of said outdoor environment temperature, detect the maximum operation frequency F2 of pairing compressor under the different outdoor environment temperatures;
(3), compare in the interval T of said outdoor environment temperature the smaller value among the F1 and F2 under the same outdoor environment temperature, obtain F3;
(4), F3 is simplified match, obtain maximum operation frequency and outdoor environment temperature function relation curve F4=f (Tout) at the interval T inner compressor of said outdoor environment temperature by linear function relation;
(5), combine described function relation curve F4, confirm that (Tout, K), wherein, K is a voltage coefficient for maximum operation frequency and the function relation curve Fmax=f between outdoor environment temperature and the input voltage value U_in of compressor.
Further, also comprise step (6), when compressor powers on operation at every turn; External environmemt temperature T out of sensing chamber and input voltage value U_in; And confirm voltage coefficient K according to U_in, (Tout K) confirms current compressor operating peak frequency according to function relation curve Fmax=F then; And in the compressor operating process, per interval t carries out this step again.
Further again, the voltage coefficient K in the said step (6) confirms that method is:
Set the lower limit U2 that air-conditioning allows input voltage, relatively the relation of the air-conditioning input voltage lower limit U1 of input voltage value U_in and U2 and GB regulation:
If U_in >=U1, then K=1;
If U1＞U_in >=U2, then K=U_in/U1;
If U_in＜U2, then K=0.
Further again; In the said step (4); Interval T is divided into some minizones with said outdoor environment temperature; By the linear function relation F3 simplification is simulated the function relation curve F4=f (Tout) at said each minizone inner compressor peak frequency and outdoor environment temperature, clearly, F4 is a piecewise function.
Preferably, in the step (5), the function relation Fmax=K * F4 between the maximum operation frequency of compressor and outdoor environment temperature and the input voltage value U_in.
Further again, because when frequency converting air conditioner freezed, outdoor environment temperature was high more, the maximum operating pressure of compressor can surpass Compressor Technology specifications set upper limit value through regular meeting and exceed standard; Heat radiation to automatically controlled components and parts is unfavorable more; Core parts IPM module, the PFC of the outdoor control of frequency converting air conditioner are unfavorable when special; IPM module own, PFC also produce heat, and the temperature rise CLV ceiling limit value △ T of the controller that sets in the step (1) is the temperature rise CLV ceiling limit value of IPM module and PFC.
Compared with prior art; Advantage of the present invention and good effect are: a kind of transducer air conditioning compressor frequency boundary Control method of the present invention; Under the prerequisite that satisfies compressor operating reliability and automatically controlled operational reliability, reset the compressor operating frequency through introducing outdoor environment temperature and air-conditioning input voltage input variable, its boundary setting is wideer; Under new frequency boundary, compressor and automatically controlled reliability can guarantee fully.Particularly the current parameters setting is wideer for various protection parameters simultaneously.Can realize the frequency converting air conditioner fast-refrigerating, heat, reach fast the requirement of setting temperature, thereby improve the travelling comfort of frequency converting air conditioner.
After the detailed description in conjunction with the advantages embodiment of the present invention, other characteristics of the present invention and advantage will become clearer.
Description of drawings
Fig. 1 is the maximum running frequency figure of existing transducer air conditioning compressor;
Fig. 2 is a kind of embodiment's of a transducer air conditioning compressor frequency boundary Control method proposed by the invention flow chart;
Fig. 3 is the part flow chart among the embodiment one;
Fig. 4 is the F1 plotted curve among Fig. 2;
Fig. 5 is the F2 plotted curve among Fig. 2;
Fig. 6 is the F3 plotted curve among Fig. 2;
Fig. 7 is the F4 plotted curve among Fig. 2.
Embodiment
Do explanation in further detail below in conjunction with the accompanying drawing specific embodiments of the invention.
Present transducer air conditioning compressor operating frequency boundary is generally a fixed value; Yet when frequency converting air conditioner freezed, the operating pressure of compressor can be along with the reduction of the rising of outdoor environment temperature and input voltage and is increased, in order to protect the compressor reliable operation; It is on the low side that the compressor frequency border often is provided with; The compressor operating frequency limited is bigger, and maximum refrigerating capacity performance is not come out, and influences the usability of transducer air conditioning; To the problems referred to above; Transducer air conditioning compressor frequency boundary Control method provided by the invention is characteristic variable through introducing one with outdoor environment temperature and air-conditioning input voltage, confirms reliable frequency boundary of compressor operating and the reliable frequency boundary of automatically controlled components and parts according to outdoor environment temperature and input voltage; Two edge frequencies get the small value; So just confirmed the correlation function of compressor frequency running boundary and outdoor environment temperature and input voltage, warp is revised, match is simplified to outer shroud temperature, air-conditioning input voltage is some frequency functions of characteristic variable, changes into the control of air conditioning frequency converter again.The delivery temperature of frequency converting air conditioner protection control, anti-freeze protection control, antioverloading protection control, the setting of current protection Control Parameter just can be relaxed, and protection is just under abnormal conditions, just play compressor operating, the automatically controlled reliable effect protected under exceedingly odious operating mode and the ELV.Under new frequency boundary, compressor and automatically controlled reliability can guarantee that fully particularly the current parameters setting is wideer for various protection parameters simultaneously.
Present embodiment is that example describes with a kind of split type transducer air conditioning; Outdoor controller control compressor operating frequency; Be provided with outdoor environment temperature sensor and input voltage detection circuit; Can detect outdoor environment temperature and air-conditioning input voltage parameter, control software is according to detected outdoor environment temperature and input voltage in the controller, and the operation frequency maximum value of confirming compressor runs well and controls; Air-conditioning has under the limit ultra-voltage protectiveness and stops compressor function, prevents that air-conditioning quilt damages under the ELV situation.Referring to shown in Figure 2, the transducer air conditioning compressor frequency boundary Control method of present embodiment may further comprise the steps:
The temperature rise CLV ceiling limit value △ T of S1, setting controller is a restrictive condition with △ T, in the interval T of certain outdoor environment temperature, detects the maximum operation frequency F1 of pairing compressor under the different outdoor environment temperatures;
Also promptly, resulting F1 is actual under the prerequisite that is no more than controller temperature rise CLV ceiling limit value △ T, and in the interval T of outdoor environment temperature, the pairing compressor maximum operation frequency of different outdoor environment temperatures F1 is a curve, referring to shown in Figure 3, is the curve of F1.
Because when frequency converting air conditioner freezes; Outdoor environment temperature is high more; The maximum operating pressure of compressor can often surpass Compressor Technology specifications set upper limit value more, and unfavorable more to the heat radiation of automatically controlled components and parts, particularly core parts IPM module, the PFC of the outdoor control of frequency converting air conditioner are unfavorable; IPM module own, PFC also produce heat, so the temperature rise CLV ceiling limit value △ T of the controller that sets among the step S1 is the temperature rise CLV ceiling limit value of IPM module and PFC.
S2, set compressor and allow operating pressure CLV ceiling limit value △ P, and be restrictive condition, in the interval T of said outdoor environment temperature, detect the maximum operation frequency F2 of pairing compressor under the different outdoor environment temperatures with △ P.
Also promptly, allow at compressor under the prerequisite of operating pressure, in the interval T of the outdoor environment temperature that in step S1, is limited equally; Detect the maximum operation frequency F2 of the pairing compressor of different outdoor environment temperatures; Be similarly a curve,, be the curve of F2 referring to shown in Figure 4.
S3, compare in the interval T of said outdoor environment temperature the smaller value among the F1 and F2 under the same outdoor environment temperature, obtain F3;
Compare the minimum value of F1 and F2; Obtain curve F3; Its physical significance is to satisfy at the same time to be no more than controller temperature rise CLV ceiling limit value △ T and to allow under the condition of operating pressure △ P at compressor; In the interval T of the outdoor environment temperature that in step S1, is limited, the maximum operation frequency F3 of the pairing compressor of different outdoor environment temperatures, its plotted curve is referring to shown in Figure 5.
S4, F3 is simplified match, obtain maximum operation frequency and outdoor environment temperature function relation curve F4=f (Tout) at the interval T inner compressor of said outdoor environment temperature by linear function relation;
Because the irregular curve of F3 for drawing through experiment in actual use, must be simplified match with it, represent with the most approaching, the simplest functional relation, to reduce the amount of calculation in the operation of air conditioner process, improve computational efficiency.
Specifically in the present embodiment; Referring to shown in Figure 6; Interval T is divided into some minizones with said outdoor environment temperature; By the linear function relation F3 simplification is simulated the function relation curve F4=f (Tout) at said each minizone inner compressor peak frequency and outdoor environment temperature, clearly, F4 is a piecewise function.
Concrete interval T has been divided into A, B, C, D, five intervals of E with outdoor environment temperature in the present embodiment, simulates each interval functional relation and is:
As Tout≤T1, F4=F_T1;
As T2 >=Tout＞T1, F4=F_T1+ (F_T3-F_T1)/(T2-T1) * (Tout-T1);
As T3 >=Tout＞T2, F4=F_T3;
As T4 >=Tout＞T3, F4=F_T3-(F_T3-F_T4)/(T3-T4) * (Tout-T3);
As Tout＞T4, F4=F_T4.
S5, combine described function relation curve F4, confirm that (Tout, K), wherein, K is a voltage coefficient for maximum operation frequency and the function relation curve Fmax=f between outdoor environment temperature and the input voltage value U_in of compressor.
It is characteristic variable with outdoor environment temperature and air-conditioning input voltage that the compressor frequency boundary Control method purpose of present embodiment is to provide a kind of; Confirm reliable frequency boundary of compressor operating and the reliable frequency boundary of automatically controlled components and parts according to outdoor environment temperature and low voltage; The relation on outdoor environment temperature and compressor frequency border only is provided among the step S1-S4; Therefore; Also need take all factors into consideration the relation on input voltage and compressor frequency border, the function relation in the present embodiment between the maximum operation frequency of compressor and outdoor environment temperature and the input voltage value U_in is linear relationship, that is: Fmax=K * F4.
Up to the present, having provided with outdoor environment temperature and air-conditioning input voltage among the step S1-S5 is characteristic variable, confirms reliable frequency boundary of compressor operating and the reliable frequency boundary relation curve of automatically controlled components and parts according to outdoor environment temperature and low voltage; Also to solve problem in the compressor actual moving process, how to utilize this curve, therefore, also comprise step S6; Referring to shown in Figure 2; Power on when operation at compressor at every turn, external environmemt temperature T out of controller sensing chamber and input voltage value U_in, and confirm voltage coefficient K according to U_in; Then according to function relation curve Fmax=F (Tout; K) confirm current compressor operating peak frequency, and in the compressor operating process, per interval t carries out this step again.
Voltage coefficient K among the said step S6 confirms that method is:
Set the lower limit U2 that air-conditioning allows input voltage, relatively the relation of the air-conditioning input voltage lower limit U1 of input voltage value U_in and U2 and GB regulation:
If U_in >=U1, then K=1;
If U1＞U_in >=U2, then K=U_in/U1;
If U_in＜U2, then K=0.
The transducer air conditioning compressor frequency boundary Control method of present embodiment; Reset the compressor operating frequency through introducing outdoor environment temperature and air-conditioning input voltage input variable; A compressor frequency boundary line is provided; Can satisfy compressor operating reliability and automatically controlled operational reliability, again can the maximum frequency of operation boundary setting of compressor is wideer, and also the maximum frequency of operation border of compressor can change along with the variation of outdoor environment temperature and input voltage value; Under new frequency boundary, compressor and automatically controlled reliability can guarantee fully.Particularly the current parameters setting is wideer for various protection parameters simultaneously.Can realize the frequency converting air conditioner fast-refrigerating, heat, reach fast the requirement of setting temperature, thereby improve the travelling comfort of frequency converting air conditioner.In addition, the transducer air conditioning compressor of present embodiment has the function that protectiveness under the limit ultra-voltage is stopped compressor, and promptly when U_in＜U2 was set, then K=0 prevented that air-conditioning quilt damages under the ELV situation.
Certainly; Above-mentioned explanation is not to be limitation of the present invention; The present invention also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present invention also should belong to protection scope of the present invention.
Claims (6)
1. a transducer air conditioning compressor frequency boundary Control method is characterized in that, may further comprise the steps:
(1), the temperature rise CLV ceiling limit value △ T of setting controller, be restrictive condition with △ T, in the interval T of certain outdoor environment temperature, detect the maximum operation frequency F1 of pairing compressor under the different outdoor environment temperatures;
(2), set compressor and allow operating pressure CLV ceiling limit value △ P, and be restrictive condition with △ P, in the interval T of said outdoor environment temperature, detect the maximum operation frequency F2 of pairing compressor under the different outdoor environment temperatures;
(3), compare in the interval T of said outdoor environment temperature the smaller value among the F1 and F2 under the same outdoor environment temperature, obtain F3;
(4), F3 is simplified match, obtain maximum operation frequency and outdoor environment temperature function relation curve F4=f (Tout) at the interval T inner compressor of said outdoor environment temperature by linear function relation;
(5), combine described function relation curve F4, confirm that (Tout, K), wherein, K is a voltage coefficient for maximum operation frequency and the function relation curve Fmax=f between outdoor environment temperature and the input voltage value U_in of compressor.
2. transducer air conditioning compressor frequency boundary Control method according to claim 1 is characterized in that, also comprises step (6); Power on when operation at compressor at every turn, external environmemt temperature T out of sensing chamber and input voltage value U_in, and confirm voltage coefficient K according to U_in; Then according to function relation curve Fmax=F (Tout; K) confirm current compressor operating peak frequency, and in the compressor operating process, per interval t carries out this step again.
3. transducer air conditioning compressor frequency boundary Control method according to claim 2 is characterized in that the voltage coefficient K in the said step (6) confirms that method is:
Set the lower limit U2 that air-conditioning allows input voltage, relatively the relation of the air-conditioning input voltage lower limit U1 of input voltage value U_in and U2 and GB regulation:
If U_in >=U1, then K=1;
If U1＞U_in >=U2, then K=U_in/U1;
If U_in＜U2, then K=0.
4. according to the described transducer air conditioning compressor frequency of each claim of claim 1-3 boundary Control method; It is characterized in that; In the said step (4); Interval T is divided into some minizones with said outdoor environment temperature, F3 is simplified simulating the function relation curve F4=f (Tout) at said each minizone inner compressor peak frequency and outdoor environment temperature by the linear function relation.
5. according to the described transducer air conditioning compressor frequency of each claim of claim 1-3 boundary Control method; It is characterized in that; In the step (5), the function relation Fmax=K * F4 between the maximum operation frequency of compressor and outdoor environment temperature and the input voltage value U_in.
6. according to the described transducer air conditioning compressor frequency of each claim of claim 1-3 boundary Control method, it is characterized in that the temperature rise CLV ceiling limit value △ T of the controller that sets in the step (1) is the temperature rise CLV ceiling limit value of IPM module and PFC.
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