CN1796885A - Defrosting control method for air conditioner - Google Patents
Defrosting control method for air conditioner Download PDFInfo
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Abstract
The invention relates to a defrosting control method of an air conditioner, which aims to effectively set the condition that the air conditioner enters a defrosting mode, and is characterized in that: when the heating mode is started, after the compressor continuously operates for a certain time, comparing a difference value delta T1 between the indoor tube temperature Tr and the indoor environment temperature Th, and finding out a maximum value Tmax of delta T1; during the subsequent time, if every M2 minutes, the delta T1 decreases by T5 degrees, and is continued for a plurality of times; or, in a certain time period M, the difference between any time delta T1 and the highest value Tmax of the detected delta T1 is smaller than a set value T; and simultaneously detecting that the indoor tube temperature Tr is less than T1 and the difference between the indoor tube temperature Tr and the indoor environment temperature Th is less than or equal to a set value T2 in a continuous period of time, and entering a defrosting mode. The invention has the advantages of solving the problems of no frost on the outdoor heat exchanger, defrosting with frost and quitting after the frost is removed, and improving the heating efficiency of the heat pump type air conditioner.
Description
Technical field:
The present invention relates to the defrosting control method of air-conditioner, be particularly related to have can sensing chamber's outer heat-exchanger on the frosting situation, and under the heating work pattern again, with being arranged on the method that temperature sensor on the indoor and outdoor heat exchanger and indoor temperature transmitter start defrost operation.
Background technology:
In traditional heat pump type air conditioner, temperature sensor on the employing outdoor heat converter is judged the frosting situation on the outdoor heat converter mostly, start defrost operation with the temperature sensor that is arranged on the outdoor heat converter, simultaneously, defrosting time also is to finish to determine automatically by sensing chamber's Outer Tube temperature or by detecting the scheduled time.In this Defrost method, the phenomenon of mistake defrosting appears through regular meeting, promptly in fact on the outdoor heat converter not frost form or have frost to eliminate after also continue defrosting.
Summary of the invention:
The Defrost method that the purpose of this invention is to provide a kind of heat pump type air conditioner, it utilizes interior conduit temperature and indoor temperature transmitter to come formation situation and definite defrosting time of frost on sensing chamber's outer heat-exchanger, effectively prevented in traditional air-conditioner defrosting mode time defrosting and because outdoor environment temperature is relatively low when absolute humidity is low-down, under the situation that frost does not form on the outdoor heat converter, can be according to very low defrosting of temperature of time conditions or yard piping temperature sensor, influence heats the efficient of operation, can accomplish accurate defrosting.Simultaneously, because under the defrosting exit criteria, we do not have the simple dependence time control the defrosting withdraw from, but mainly rely on interior conduit variation of temperature situation, auxiliary to limit defrosting time, control the defrosting exit criteria, solved the white problem that does not still withdraw from that eliminated on the outdoor heat converter.The present invention's defrosting enters pattern and withdraws from the combination of pattern, really solved and frostlessly on the outdoor heat converter do not removed, frost defrosting is arranged, eliminate the problem that withdraws from, improved heating operating efficiency it effectively having set the condition that heat pump type air conditioner enters defrosting mode of heat pump type air conditioner.
The object of the present invention is achieved like this: the defrosting control method of air-conditioner, this method comprise that defrosting enters pattern:
After heating mode begins, after compressor turned round certain hour M1 minute continuously, by detect more indoor pipe Wen WenduT r and indoor environment temperature Th difference DELTA T1, find out the peak Tmax of Δ T1;
In later time, if in every M2 minute, Δ T1 decline T5 degree, and continuous several times; Perhaps, in regular hour section M, by with indoor pipe Wen Wendu of arbitrary moment
Tr and indoor environment temperature Th difference DELTA T1 and the difference of the peak Tmax of detected Δ T1 less than the value T of a certain setting;
And detect simultaneously in continuous a period of time, indoor pipe Wen WenduT r is less than T1, and the difference of indoor pipe Wen WenduT r and indoor environment temperature Th then enters the defrost operation pattern smaller or equal to a value T2 who sets.
This Defrost method can also comprise that defrosting withdraws from pattern:
After entering defrosting mode, program circuit is divided into parallel two-way, and one the tunnel is Rule of judgment to force defrosting post-set time, and one the tunnel is Rule of judgment with the interior conduit temperature; As long as a decision condition is set up, just withdraw from this defrost operation.
Described is that the defrosting of Rule of judgment is withdrawed from pattern and is with the interior conduit temperature:
After entering defrost state M3 minute, detect the also minimum Tmin of recording room interior conduit temperature; If interior conduit temperature minimum Tmin is lower than a certain temperature value T3, then:
Interior conduit temperature T r when subsequently sets value T4 than described minimum Tmin high, carries out defrost operation behind the certain hour of then delaying time; Perhaps, the duration does not descend greater than M6 minute described interior conduit temperature minimum Tmin, finishes defrost operation behind the certain hour of then delaying time; Perhaps,, then must be greater than or equal to T9+1, carry out defrost operation behind the certain hour of then delaying time when indoor continuous a period of time of pipe temperature Tr when interior conduit temperature minimum Tmin is lower than a setting value T9.
Described is that the defrosting of Rule of judgment is withdrawed from pattern and is with the interior conduit temperature:
After entering defrost state M3 minute, detect the also minimum Tmin of recording room interior conduit temperature; If interior conduit temperature minimum Tmin is lower than a certain temperature value T3, then:
When described interior conduit temperature minimum Tmin no longer descends, and the duration greater than M6 minute, then finish defrost operation; Perhaps, when described interior conduit temperature minimum Tmin no longer descends, and interior conduit temperature T r finishes defrost operation than the high setting value of described minimum Tmin behind the certain hour of then delaying time; Perhaps,, then must be greater than or equal to T9+1, carry out defrost operation behind the certain hour of then delaying time when indoor continuous a period of time of pipe temperature Tr when interior conduit temperature minimum Tmin is lower than a setting value T9.
Advantage of the present invention is: utilize interior conduit temperature and indoor temperature transmitter to come formation situation and definite defrosting time of frost on sensing chamber's outer heat-exchanger, effectively prevented in traditional air-conditioner defrosting mode time defrosting and because outdoor environment temperature is relatively low when absolute humidity is low-down, under the situation that frost does not form on the outdoor heat converter, but can be according to the temperature of time conditions or yard piping temperature sensor very low the defrosting, influence heats the efficient of operation, can accomplish accurate defrosting.Simultaneously, because under the defrosting exit criteria, we do not have the simple dependence time control the defrosting withdraw from, but mainly rely on interior conduit variation of temperature situation, auxiliary to limit defrosting time, control the defrosting exit criteria, solved the white problem that does not still withdraw from that eliminated on the outdoor heat converter.The present invention defrosting enters pattern and withdraws from the combination of pattern, has really solved frostlessly on the outdoor heat converter not remove, and the frost defrosting is arranged, and eliminates the problem that withdraws from, and has improved the operating efficiency that heats of heat pump type air conditioner.
Description of drawings:
Figure 1A, 1B are that the present invention defrosts and enters the flow chart of mode decision;
Fig. 2 is that the present invention defrosts and withdraws from the flow chart of mode decision condition first embodiment;
Fig. 3 is that the present invention defrosts and withdraws from the flow chart of mode decision condition second embodiment;
The specific embodiment:
Figure 1A, 1B have illustrated that defrosting enters the mode decision condition.Shown in Figure 1A, 1B, after entering heating mode, step S1 determines whether compressor has moved M1 minute continuously, if compressor does not move M1 minute continuously, then continues step S1.If moved M1 minute, then flow process is transformed into step 2.The purpose that this step is set is for data that step S2 is collected are effective really, because in the starting stage of compressor operating, the parameters of heating is all less than stable, if sampling at this moment will certainly influence the authenticity of data.The time of operation is meant between double defrosting mode the continual working time of compressor to described compressor continuously.
Step S2 is for after determining M1 minute compressor operating a period of time, indoor pipe Wen WenduT r and indoor environment temperature Th difference DELTA T1, find out the peak Tmax of Δ T1, deposit the result in memory.
Step S3 judges the Δ T1 T5 degree that whether descended in M2 minute, and continuous three times, if then flow process is transformed into step S9; Be transformed into step S4 if not flow process then;
The Rule of judgment of step S4 is, whether compressor accumulated running time M is in time period 40≤M≤50 minute, and whether the difference between Δ T1 and the Δ T1 maximum of T max is less than T=-8 ℃ of a certain setting value, perhaps, judge the Δ T1 T5 degree that whether in M2 minute, descended, and continuous three times; Two conditions are as long as satisfy one, and then flow process is transformed into step S9; If two one of conditions do not satisfy yet, then flow process is transformed into step S5.The time of described compressor accumulative total operation is meant the accumulative total of the time between double defrosting mode.
The Rule of judgment of step S5 is, whether compressor accumulated running time M is in time period 50＜M≤60 minute, and whether the difference between the maximum of T max of Δ T1 and Δ T1 is less than T=-6 ℃ of a certain setting value, perhaps, judge the Δ T1 T5 degree that whether in M2 minute, descended, and continuous three times; Two conditions are as long as satisfy one, and then flow process is transformed into step S9; If two one of conditions do not satisfy yet, then flow process is transformed into step S6.
The Rule of judgment of step S6 is, whether compressor accumulated running time M is in time period 60＜M≤70 minute, and whether the difference between the maximum of T max of Δ T1 and Δ T1 is less than T=-5 ℃ of a certain setting value, perhaps, judge the Δ T1 T5 degree that whether in M2 minute, descended, and continuous three times; Two conditions are as long as satisfy one, and then flow process is transformed into step S9; If two one of conditions do not satisfy yet, then flow process is transformed into step S7.
The Rule of judgment of step S7 is, whether compressor accumulated running time M is in time period 70＜M≤120 minute, and whether the difference between the maximum of T max of Δ T1 and Δ T1 is less than T=-4 ℃ of a certain setting value, perhaps, judge the Δ T1 T5 degree that whether in M2 minute, descended, and continuous three times; Two conditions are as long as satisfy one, and then flow process is transformed into step S9; If two one of conditions do not satisfy yet, then flow process is transformed into step S8.
The Rule of judgment of step S8 is, whether compressor accumulated running time M is in time period M＞120 minute, and whether the difference between the maximum of T max of Δ T1 and Δ T1 is less than T=-3 ℃ of a certain setting value, perhaps, judge the Δ T1 T5 degree that whether in M2 minute, descended, and continuous three times; Two conditions are as long as satisfy one, and then flow process is transformed into step S9;
From last we can find out, the Rule of judgment of step S5 after step S5, S6, S7, S8 is consistent with the Rule of judgment of step S4 basically, difference only is the difference of the residing time period of compressor accumulated running time M between step S4, S5, S6, S7, the S8, and indoor pipe Wen WenduT r and indoor environment temperature Th difference DELTA T1 and the difference between the peak Tmax of Δ T1 whether less than a certain difference that sets value T.
Following table is an above-mentioned difference between expression step S4, S5, S6, S7, the S8:
| S4 | S5 | S6 | S7 | S8 | |
| M unit: minute | 40≤M≤ 50 | 50＜M≤ 60 | 60＜M≤70 | 70＜M≤ 120 | M＞120 |
| T unit: ℃ | -8 | -6 | -5 | -4 | -3 |
When flow process is transformed into step S9, further judge to be in continuous 30 seconds, interior conduit temperature T r is less than a certain setting value T1, and the difference Δ T1 of interior conduit temperature T r and indoor environment temperature Th is less than a setting value T2, be Tr-Th＜T2, if the condition achievement then enters defrosting mode.
Certainly, above-mentioned compressor accumulated running time M also can only divide one section, but in order to guarantee the formation situation of the frost on the accurate sensing chamber outer heat-exchanger, to the segmentation of Rule of judgment compressor accumulated running time M, refinement more, accurate more, resulting effect is good more.
In addition, under heating mode, if the start first time after long a period of time, then compressor moves more than M1 minute continuously, the peak Tmax of indoor pipe Wen WenduT r and indoor environment temperature Th difference DELTA T1 is lower than T1, and indoor pipe Wen WenduT r when compressor accumulative total runs to M7 minute and indoor environment temperature Th difference DELTA T1 are lower more than T6 ℃ than the peak Tmax of Δ T1, then also enter defrosting mode.
Because in the air-conditioning heating process, the interior conduit temperature is relevant with the air quantity of indoor fan, and along with the increase of air quantity, the interior conduit temperature can descend to some extent.Therefore also can change at the above-mentioned Tmax that finds, in order to respond above-mentioned variation, to revising as the interior conduit temperature peak Tmax that is in the different wind shelves times along with the variation of fan delivery.Because in the above-mentioned heating mode, interior conduit temperature peak Tmax tries to achieve on the apoplexy shelves, so interior conduit temperature peak is modified to Tmax-1 during high wind shelves, interior conduit temperature peak is modified to Tmax+2 during low wind shelves.
Fig. 2 has illustrated decision condition first embodiment that defrosting mode withdraws from.As shown in Figure 2, step S11 has provided and has forced defrosting T0 post-set time, and when certain condition is achieved, gives T0 the situation of assignment again.Be T0 minute the initial post-set time of forcing to defrost, if continuous 3 tired notes are not more than M4 minute and defrosting time Td=T0 running time, and the 4th accumulated running time is not more than M5 minute, then give T0 compose again one new value T0=T0+2 minute, after the operation once, force the defrosting T0 post-set time initial value that playbacks again.Behind the step S11, program circuit is divided into parallel two-way, and one the tunnel is Rule of judgment to force defrosting post-set time, and one the tunnel is Rule of judgment with the interior conduit temperature.As long as a decision condition achievement just withdraws from this defrost operation.
Step 12 is to determine after M3 minute, detects the also minimum Tmin of recording room interior conduit temperature, and deposits memory in.
Whether step 13 judges the minimum Tmin of interior conduit temperature less than a certain setting value T3, and T3 is can detected minimum temperature according to this air-conditioning system indoor temperature transmitter; If then flow process is transformed into step S15; Be transformed into step S14 if not flow process then;
The Rule of judgment of step S14 is, whether the difference of the minimum Tmin of interior conduit temperature T r and interior conduit temperature no longer descends greater than M6 minute described interior conduit temperature minimum Tmin greater than a setting value T4 or duration, two conditions are as long as satisfy one, and flow process is transformed into step S17 after a period of time of then delaying time; If two conditions all do not satisfy, then continue to judge and set up up to one of described condition;
Step S15 is whether the minimum Tmin that judges the interior conduit temperature is lower than a design temperature T9, and indoor continuous a period of time of pipe temperature Tr is more than or equal to T9+1; If flow process is transformed into step S20 after a period of time of then delaying time; If not, then continue to judge and set up up to described condition;
Step S16 judges whether monitoring defrosting time Td arrives pressure defrosting T0 post-set time, if condition is set up, then flow process is transformed into step S17; If condition is false, then continue monitoring.
Step S17 is the instruction of withdrawing from defrosting mode, when withdrawing from defrosting mode, write down the time T d of this Defrost operation, and compare with T0, if Td equals T0 then rolling counters forward adds 1; If be not equal to then, rolling counters forward zero clearing, and enter heating mode.
Fig. 3 has illustrated decision condition second embodiment that defrosting mode withdraws from.As shown in Figure 3, decision condition first embodiment that present embodiment and defrosting mode withdraw from, maximum difference is: in the present embodiment, replaced step 14 among the embodiment one with step S24, step S25, step S26.Only be described below with regard to step S24, step S25, step S26.
The Rule of judgment of step S24 is: whether described interior conduit temperature minimum Tmin no longer descends, if not, then continue to judge and set up until this condition; If described interior conduit temperature minimum Tmin no longer descends, then parallel determining step S25 and step S26; As long as a decision condition achievement, flow process forwards step S29 to and finishes defrost operation;
Step S25, if interior conduit temperature T r sets value T4 than described minimum Tmin high, flow process forwards step S29 end defrost operation to behind the certain hour of then delaying time; If described condition is false, then continues to judge and set up up to condition;
Whether step S26 judges phenomenon duration that described interior conduit temperature minimum Tmin no longer descends greater than M6 minute, if then flow process forwards step S29 to and finishes defrost operation; If described condition is false, then flow process is transformed into step S24;
Enter pattern and defrosting is withdrawed from the pattern in above-mentioned defrosting, time parameter M1, M2, M3, M4, M5, M6, M7 and temperature parameter T1, T2, T3, T4, T5, T6, T9 all are certain values, can set according to specific external conditions such as weather, all can not change in case be set in the whole flow process.Under parameter T0, T certain certain condition in the whole procedure flow process is variable, belongs to conditional-variable.Parameter M, Tr, Td, Th, Tmax, Tmin change in time in the whole procedure flow process and change, and belong to stochastic variable.
Claims (8)
1, the defrosting control method of air-conditioner is characterized in that, the defrosting pattern of entering is:
After heating mode begins, after compressor turned round certain hour M1 minute continuously, by detect more indoor pipe Wen WenduT r and indoor environment temperature Th difference DELTA T1, find out the peak Tmax of Δ T1;
In later time, if in every M2 minute, Δ T1 decline T5 degree, and continuous several times;
And detect simultaneously in continuous a period of time, indoor pipe Wen WenduT r is less than T1, and the difference of indoor pipe Wen WenduT r and indoor environment temperature Th then enters the defrost operation pattern smaller or equal to a value T2 who sets.
2, the defrosting control method of air-conditioner is characterized in that, the defrosting pattern of entering is:
After heating mode began, compressor accumulative total was moved M2 minute, moved M3 minute continuously but when moving not enough M1 minute continuously, by detecting the difference DELTA T1 of more indoor pipe Wen WenduT r and indoor environment temperature Th, found out the peak Tmax of Δ T1;
In regular hour section M, by with indoor pipe Wen WenduT r of arbitrary moment and indoor environment temperature Th difference DELTA T1 and the difference of the peak Tmax of detected Δ T1 less than the value T of a certain setting;
And detect simultaneously in continuous a period of time, indoor pipe Wen WenduT r is less than T1, and indoor pipe Wen WenduT r and indoor environment temperature Th difference smaller or equal to a value T2 who sets, then enter the defrost operation pattern.
3, the defrosting control method of air-conditioner according to claim 1 and 2, it is characterized in that, under heating mode, if the start first time after a period of time, then compressor moves more than M1 minute continuously, indoor pipe Wen WenduT r and indoor environment temperature Th difference DELTA T1 be lower than one the setting value T1, and, indoor pipe Wen WenduT r when compressor accumulative total runs to M7 minute and indoor environment temperature Th the peak Tmax low T6 degree of difference DELTA T1 than Δ T1 more than, then also enter defrosting mode.
4, the defrosting control method of air-conditioner according to claim 3, it is characterized in that, when the wind shelves of indoor fan change, to be in indoor pipe Wen WenduT r in the different wind shelves times and indoor environment temperature Th the method revised of the peak Tmax of difference DELTA T1 be, during high wind shelves indoor pipe Wen WenduT r and indoor environment temperature Th the peak of difference DELTA T1 be modified to Tmax-1, during low wind shelves indoor pipe Wen WenduT r and indoor environment temperature Th the peak of difference DELTA T1 be modified to Tmax+2.
5, the defrosting control method of air-conditioner is characterized in that, defrosting is withdrawed from pattern and is:
After entering defrosting mode, program circuit is divided into parallel two-way, and one the tunnel is Rule of judgment to force defrosting post-set time, and one the tunnel is Rule of judgment with the interior conduit temperature; As long as a decision condition is set up, just withdraw from this defrost operation.
6, the defrosting control method of air-conditioner according to claim 5 is characterized in that, is that the defrosting of Rule of judgment is withdrawed from pattern and is with the interior conduit temperature:
After entering defrost state M3 minute, detect the also minimum Tmin of recording room interior conduit temperature; If interior conduit temperature minimum Tmin is lower than a certain temperature value T3, then:
Interior conduit temperature T r when subsequently sets value T4 than described minimum Tmin high, carries out defrost operation behind the certain hour of then delaying time; Perhaps, the duration does not descend greater than M6 minute described interior conduit temperature minimum Tmin, finishes defrost operation behind the certain hour of then delaying time; Perhaps,, then must be greater than or equal to T9+1, carry out defrost operation behind the certain hour of then delaying time when indoor continuous a period of time of pipe temperature Tr when interior conduit temperature minimum Tmin is lower than a setting value T9.
7, the defrosting control method of air-conditioner according to claim 5 is characterized in that, is that the defrosting of Rule of judgment is withdrawed from pattern and is with the interior conduit temperature:
After entering defrost state M3 minute, detect the also minimum Tmin of recording room interior conduit temperature; If interior conduit temperature minimum Tmin is lower than a certain temperature value T3, then:
When described interior conduit temperature minimum Tmin no longer descends, and the duration greater than M6 minute, then finish defrost operation; Perhaps, when described interior conduit temperature minimum Tmin no longer descends, and interior conduit temperature T r finishes defrost operation than the high setting value of described minimum Tmin behind the certain hour of then delaying time; Perhaps,, then must be greater than or equal to T9+1, carry out defrost operation behind the certain hour of then delaying time when indoor continuous a period of time of pipe temperature Tr when interior conduit temperature minimum Tmin is lower than a setting value T9.
8, the defrosting control method of air-conditioner according to claim 5, it is characterized in that, be T0 minute the initial post-set time of forcing to defrost, if N continuous time accumulated running time is not more than M4 minute and defrosting time is T0, and the N+1 time accumulated running time is not more than M5 minute, then give T0 compose again one new value T0=T0+2 minute, after the operation once, the pressure T0 initial value that playbacks again post-set time that defrosts.
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| CN101769571A (en) * | 2008-12-26 | 2010-07-07 | Lg电子株式会社 | Air conditioner and method of operating the same |
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- 2004-12-24 CN CN 200410091833 patent/CN1796885A/en active Pending
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