CN102748275B - 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 frequency converting air conditioner technical field.
Background technique
Traditional transducer air conditioning compressor operating frequency boundary is a fixed value, shown in Figure 1, for the maximum running frequency figure of existing transducer air conditioning compressor, for theoretical highest frequency, associated without function with the parameter such as outdoor environment temperature, input voltage, it is only single edge frequency value, actual motion is according to the parameter adjustment such as delivery temperature, electric current, very low at some operating mode lower frequency, even and if it is conservative to control parameter under ELV, can not avoid compressor operating pressure to exceed standard and exceed standard with automatically controlled temperature rise, ELV is impaired may.
In the time of refrigerating of convertible frequency air conditioner, outdoor environment temperature is higher, and the maximum operating pressure of compressor can often can exceed Compressor Technology specifications set upper limit value and exceed standard; And more unfavorable to the heat radiation of automatically controlled components and parts, particularly core parts IPM module (Intelligent Power Module), the PFC(PFC of the outdoor control of frequency converting air conditioner) unfavorable, IPM module own, PFC also produce heat.If simultaneous low voltage, low voltage causes that outdoor fan rotating speed declines, refrigeration system load is larger, more easily causes compressor operating pressure to exceed standard, and causes IPM module, PFC heat radiation more unfavorable.Conventional domestic variable frequency air-conditioning is in order to ensure compressor and automatically controlled operational safety, when refrigeration, being provided with delivery temperature protection controls, anti-freeze protection is controlled, antioverloading protection is controlled, current protection control etc., these are controlled at whole process of refrigerastion and are full range 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, it is comparatively conservative that general electric currents etc. are controlled the setting of parameter protection value, otherwise some specific bad working environments or abnormal failure, to cause compressor even not damage by reliable operation, automatically controlled components and parts are as power model, PFC etc. very easily temperature rise are too high and breakdown, the total failare rate of product is high.Must cause compressor frequency border to arrange so on the low side, peak frequency is limited larger, and maximum refrigerating capacity is brought into play not out, is not inconsistent with frequency changer fast-refrigerating, the requirement that reaches fast setting temperature.
Summary of the invention
The present invention is a fixed value in order to solve existing transducer air conditioning compressor operating frequency boundary, easily cause compressor operating pressure to exceed standard, and compressor frequency border arranges on the low side, peak frequency is limited larger, maximum refrigerating capacity is brought into play not out, 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, meeting under the prerequisite of compressor operating reliability and automatically controlled operational reliability, by wider the setting of compressor operating frequency boundary, under new frequency boundary, compressor and automatically controlled reliability can ensure completely.
In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions:
A kind of transducer air conditioning compressor frequency boundary Control method, comprises the following steps:
(1), the temperature rise CLV ceiling limit value △ T of setting controller, taking △ T as restrictive condition, in the interval T of certain outdoor environment temperature, detect the maximum operation frequency F1 of corresponding compressor under different outdoor environment temperatures;
(2), setting compressor allows operating pressure CLV ceiling limit value △ P, and taking △ P as restrictive condition, in the interval T of described outdoor environment temperature, detects the maximum operation frequency F2 of corresponding compressor under different outdoor environment temperatures;
(3), compare in the interval T of described outdoor environment temperature the smaller value in F1 and F2 under same outdoor environment temperature, obtain F3;
(4), by linear function relation, F3 is simplified to matching, obtain maximum operation frequency and the outdoor environment temperature function relation curve F4=f(Tout at the interval T inner compressor of described outdoor environment temperature);
(5), in conjunction with described function relation curve F4, determine the function relation curve Fmax=f (Tout, K) between maximum operation frequency and outdoor environment temperature and the input voltage value U_in of compressor, wherein, K is voltage coefficient.
Further, also comprise step (6), in the time that compressor powers on operation at every turn, the external environmemt temperature T out of sensing chamber and input voltage value U_in, and determine voltage coefficient K according to U_in, then determine current compressor operating peak frequency according to function relation curve Fmax=F (Tout, K), and in compressor operating process, per interval t re-executes this step.
Further again, the voltage coefficient K in described step (6) determines that method is:
Set the lower limit U2 that air-conditioning allows input voltage, the relation of the air-conditioning input voltage lower limit U1 that relatively input voltage value U_in and U2 and GB specify:
If U_in >=U1, K=1;
If U1 > is U_in >=U2, K=U_in/U1;
If U_in < is U2, K=0.
Further again, in described step (4), interval described outdoor environment temperature T is divided into some minizones, by linear function relation, F3 is simplified to the function relation curve F4=f(Tout simulating at described each minizone inner compressor peak frequency and outdoor environment temperature), clearly, F4 is piecewise function.
Preferably, in step (5), the function relation Fmax=K × F4 between the maximum operation frequency of compressor and outdoor environment temperature and input voltage value U_in.
Further, due to when the refrigerating of convertible frequency air conditioner, outdoor environment temperature is higher, and the maximum operating pressure of compressor can often can exceed Compressor Technology specifications set upper limit value and exceed standard; Heat radiation to automatically controlled components and parts is more unfavorable, when special, core parts IPM module, the PFC of the outdoor control of frequency converting air conditioner are unfavorable, IPM module own, PFC also produce heat, and the temperature rise CLV ceiling limit value △ T of the controller setting in 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, meeting under the prerequisite of compressor operating reliability and automatically controlled operational reliability, reset compressor operating frequency by introducing outdoor environment temperature and air-conditioning input voltage input variable, its border arranges wider, under new frequency boundary, compressor and automatically controlled reliability can ensure completely.Particularly current parameters setting is wider for various Protection parameters simultaneously.Can realize frequency converting air conditioner fast-refrigerating, heat, reach fast the requirement of setting temperature, thereby improve the travelling comfort of frequency converting air conditioner.
Read by reference to the accompanying drawings after the detailed description of embodiment of the present invention, it is clearer that the other features and advantages of the invention will become.
Brief description of the drawings
Fig. 1 is the maximum running frequency figure of existing transducer air conditioning compressor;
Fig. 2 is a kind of embodiment's of transducer air conditioning compressor frequency boundary Control method proposed by the invention flow chart;
Fig. 3 is the part flow chart in embodiment one;
Fig. 4 is the F1 plotted curve in Fig. 2;
Fig. 5 is the F2 plotted curve in Fig. 2;
Fig. 6 is the F3 plotted curve in Fig. 2;
Fig. 7 is the F4 plotted curve in Fig. 2.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in more detail.
Current transducer air conditioning compressor operating frequency boundary is generally a fixed value, but in the time of refrigerating of convertible frequency air conditioner, the operating pressure of compressor can increase along with the reduction of the rising of outdoor environment temperature and input voltage, in order to protect compressor reliable operation, it is on the low side that compressor frequency border often arranges, compressor operating frequency limited is larger, maximum refrigerating capacity is brought into play not out, affect the usability of transducer air conditioning, for the problems referred to above, transducer air conditioning compressor frequency boundary Control method provided by the invention, by introducing one taking outdoor environment temperature and air-conditioning input voltage as characteristic variable, determine the 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 determine the correlation function of compressor frequency running boundary and outdoor environment temperature and input voltage, through revising, matching is simplified to outer shroud temperature, air-conditioning input voltage is some frequency functions of characteristic variable, change into again the control of air conditioning frequency converter.The delivery temperature protection of frequency converting air conditioner is controlled, anti-freeze protection is controlled, antioverloading protection is controlled, 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 ELV.Under new frequency boundary, compressor and automatically controlled reliability can ensure completely, and particularly current parameters setting is wider for various Protection parameters simultaneously.
The present embodiment describes as an example of the split type transducer air conditioning of one example, 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, in controller, control software according to the outdoor environment temperature and the input voltage that detect, determine that the operation frequency maximum value of compressor runs well and controls; Air-conditioning has protectiveness under limit ultra-voltage and stops compressor function, prevents that in ELV situation, air-conditioning quilt damages.Shown in Figure 2, the transducer air conditioning compressor frequency boundary Control method of the present embodiment, comprises the following steps:
The temperature rise CLV ceiling limit value △ T of S1, setting controller, taking △ T as restrictive condition, in the interval T of certain outdoor environment temperature, detects the maximum operation frequency F1 of corresponding compressor under different outdoor environment temperatures;
Also, the F1 obtaining is actual in to be no more than under the prerequisite of controller temperature rise CLV ceiling limit value △ T, and in the interval T of outdoor environment temperature, the corresponding compressor maximum operation frequency of different outdoor environment temperatures F1, is a curve, shown in Figure 4, is the curve of F1.
Due to when the refrigerating of convertible frequency air conditioner, outdoor environment temperature is higher, the maximum operating pressure of compressor more can often exceed Compressor Technology specifications set upper limit value, heat radiation to automatically controlled components and parts is more unfavorable, 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, and the temperature rise CLV ceiling limit value △ T of the controller therefore setting in step S1 is the temperature rise CLV ceiling limit value of IPM module and PFC.
S2, setting compressor allow operating pressure CLV ceiling limit value △ P, and taking △ P as restrictive condition, in the interval T of described outdoor environment temperature, detect the maximum operation frequency F2 of corresponding compressor under different outdoor environment temperatures.
Also, allow at compressor under the prerequisite of operating pressure, equally in the interval T of the outdoor environment temperature defined in step S1, detect the maximum operation frequency F2 of the corresponding compressor of different outdoor environment temperatures, be similarly a curve, shown in Figure 5, be the curve of F2.
S3, compare in the interval T of described outdoor environment temperature the smaller value in F1 and F2 under same outdoor environment temperature, obtain F3;
Compare the minimum value of F1 and F2, obtain curve F3, its physical significance is to meet be at the same time no more than controller temperature rise CLV ceiling limit value △ T and allow at compressor under the condition of operating pressure △ P, in the interval T of the outdoor environment temperature defined in step S1, the maximum operation frequency F3 of the corresponding compressor of different outdoor environment temperatures, its plotted curve is shown in Figure 6.
S4, by linear function relation, F3 is simplified to matching, obtain maximum operation frequency and outdoor environment temperature function relation curve F4=f(Tout at the interval T inner compressor of described outdoor environment temperature);
Because F3 is the irregular curve drawing by experiment, in actual use, must simplify matching, represent with the most approaching, the simplest functional relation, to reduce the amount of calculation in operation of air conditioner process, improve computational efficiency.
Specifically in the present embodiment, shown in Figure 7, interval described outdoor environment temperature T is divided into some minizones, by linear function relation, F3 is simplified to the function relation curve F4=f(Tout simulating at described each minizone inner compressor peak frequency and outdoor environment temperature), clearly, F4 is piecewise function.
Concrete in the present embodiment interval outdoor environment temperature T is divided into A, B, C, D, five intervals of E, has simulated each interval functional relation and be:
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, in conjunction with described function relation curve F4, determine the function relation curve Fmax=f (Tout, K) between maximum operation frequency and outdoor environment temperature and the input voltage value U_in of compressor, wherein, K is voltage coefficient.
It is a kind of taking outdoor environment temperature and air-conditioning input voltage as characteristic variable that the compressor frequency boundary Control method object of the present embodiment is to provide, determine the 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 is only provided in step S1-S4, therefore, also need to consider the relation on input voltage and compressor frequency border, function relation in the present embodiment between the maximum operation frequency of compressor and outdoor environment temperature and input voltage value U_in is linear relationship, that is: Fmax=K × F4.
Up to the present, in step S1-S5, provide taking outdoor environment temperature and air-conditioning input voltage as characteristic variable, determine the 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 how to utilize this curve in compressor actual moving process, therefore, also comprise step S6, shown in Figure 3, in the time that compressor powers on operation at every turn, the external environmemt temperature T out of controller sensing chamber and input voltage value U_in, and determine voltage coefficient K according to U_in, then according to function relation curve Fmax=F (Tout, K) determine current compressor operating peak frequency, and in compressor operating process, per interval t re-executes this step.
Voltage coefficient K in described step S6 determines that method is:
Set the lower limit U2 that air-conditioning allows input voltage, the relation of the air-conditioning input voltage lower limit U1 that relatively input voltage value U_in and U2 and GB specify:
If U_in >=U1, K=1;
If U1 > is U_in >=U2, K=U_in/U1;
If U_in < is U2, K=0.
The transducer air conditioning compressor frequency boundary Control method of the present embodiment, reset compressor operating frequency by introducing outdoor environment temperature and air-conditioning input voltage input variable, a compressor frequency boundary line is provided, can meet compressor operating reliability and automatically controlled operational reliability, can the maximum frequency of operation border of compressor be arranged wider again, and 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 ensure completely.Particularly current parameters setting is wider for various Protection parameters simultaneously.Can realize 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 the present embodiment has protectiveness under limit ultra-voltage and stops the function of compressor, and when U_in < U2 is set, K=0, prevents that in ELV situation, air-conditioning quilt damages.
Certainly; above-mentioned explanation is not limitation of the present invention; the present invention is also not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art make 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, comprises the following steps:
(1), the temperature rise CLV ceiling limit value △ T of setting controller, taking △ T as restrictive condition, in the interval T of certain outdoor environment temperature, detect the maximum operation frequency F1 of corresponding compressor under different outdoor environment temperatures;
(2), setting compressor allows operating pressure CLV ceiling limit value △ P, and taking △ P as restrictive condition, in the interval T of described outdoor environment temperature, detects the maximum operation frequency F2 of corresponding compressor under different outdoor environment temperatures;
(3), compare in the interval T of described outdoor environment temperature the smaller value in F1 and F2 under same outdoor environment temperature, obtain F3;
(4), by linear function relation, F3 is simplified to matching, obtain maximum operation frequency and the outdoor environment temperature function relation curve F4=f(Tout at the interval T inner compressor of described outdoor environment temperature);
(5), in conjunction with described function relation curve F4, determine the function relation curve Fmax=F (Tout, K) between maximum operation frequency and outdoor environment temperature and the voltage coefficient of compressor, wherein, K is voltage coefficient.
2. transducer air conditioning compressor frequency boundary Control method according to claim 1, it is characterized in that, also comprise step (6), in the time that compressor powers on operation at every turn, the external environmemt temperature T out of sensing chamber and input voltage value U_in, and determine voltage coefficient K according to U_in, then according to function relation curve Fmax=F (Tout, K) determine current compressor operating peak frequency, and in compressor operating process, per interval t re-executes this step.
3. transducer air conditioning compressor frequency boundary Control method according to claim 2, is characterized in that, the voltage coefficient K in described step (6) determines that method is:
Set the lower limit U2 that air-conditioning allows input voltage, the relation of the air-conditioning input voltage lower limit U1 that relatively input voltage value U_in and U2 and GB specify:
If U_in >=U1, K=1;
If U1 > is U_in >=U2, K=U_in/U1;
If U_in < is U2, K=0.
4. according to the transducer air conditioning compressor frequency boundary Control method described in claim 1-3 any one claim, it is characterized in that, in described step (4), interval described outdoor environment temperature T is divided into some minizones, by linear function relation, F3 is simplified to the function relation curve F4=f(Tout simulating at each described minizone inner compressor peak frequency and outdoor environment temperature).
5. according to the transducer air conditioning compressor frequency boundary Control method described in claim 1-3 any one claim, it is characterized in that, in step (5), the function relation Fmax=K × F4 between the maximum operation frequency of compressor and outdoor environment temperature and voltage coefficient K.
6. according to the transducer air conditioning compressor frequency boundary Control method described in claim 1-3 any one claim, it is characterized in that, the temperature rise CLV ceiling limit value △ T of the controller setting in step (1) is the temperature rise CLV ceiling limit value of IPM module and PFC module, wherein, described IPM module is Intelligent Power Module, and described PFC module is power factor correction module.
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| CN108400649A (en) * | 2018-01-12 | 2018-08-14 | 青岛海尔空调器有限总公司 | The control method of air-conditioning power supply |
| CN108302720A (en) * | 2018-01-29 | 2018-07-20 | 奥克斯空调股份有限公司 | A kind of air-conditioning control method for frequency and device |
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