CN102563805A - Control method for calculating exhaust temperature of compressor of air conditioner - Google Patents
Control method for calculating exhaust temperature of compressor of air conditioner Download PDFInfo
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- CN102563805A CN102563805A CN201110435926XA CN201110435926A CN102563805A CN 102563805 A CN102563805 A CN 102563805A CN 201110435926X A CN201110435926X A CN 201110435926XA CN 201110435926 A CN201110435926 A CN 201110435926A CN 102563805 A CN102563805 A CN 102563805A
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Abstract
The invention discloses a control method for calculating exhaust temperature of a compressor of an air conditioner. Temperature sensors are respectively mounted on an outdoor heat exchanger and an indoor heat exchanger and are used for detecting the outdoor heat exchanger temperature Te and the indoor heat exchange temperature Tc; the method for calculating the exhaust temperature of the compressor comprises the specific steps of: A, calculating a temperature correction value Tc' of the indoor heat exchanger according to the detected indoor heat exchanger temperature Tc and the operation frequency fi of a current compressor, wherein the Tc' is equal to Tc plus fi/a plus b, a is a frequency correction coefficient of the compressor and ranges from 5-40Hz and b is a temperature correction value of the indoor heat exchanger and ranges from -5DEG C-10DEG C; and B, calculating a temperature correction value Te' of the outdoor heat exchanger according to the detected temperature Te of the outdoor heat exchanger, wherein the Te' is equal to Te plus c. The control method has the characteristics of flexibility in operation, low manufacturing cost and wide application range.
Description
Technical field
The present invention relates to a kind of air-conditioner, particularly a kind of control method of calculating the compressor exhaust temperature of air-conditioner.
Background technology
Transducer air conditioning generally is equipped with evaporating temperature and the outdoor heat exchange actuator temperature that temperature sensor detects the air-conditioning system circulation time in the indoor and outdoor heat exchanger; And the compressor exhaust temperature sensor has been installed also in the blast pipe position of compressor; Delivery temperature when being used for detecting compressor operating according to the size of the height estimation compressor load of the delivery temperature of compressor, is carried out the compressor limit frequently or stoppage protection according to the compressor load of estimation is excessive; Thereby protection system; And the maximum efficient of performance, whether enough, can also carry out the control to electronic expansion valve opening according to the delivery temperature value of compressor if perhaps being used to detect the interior coolant quantity of air-conditioner system.
And in a single day traditional transducer air conditioning when detecting the exhaust gas temperature sensor fault; Just make stoppage protection; Make transducer air conditioning normally to move; Perhaps be fixed as a higher temperature to delivery temperature, the system that makes turns round under lower load, more than handles all to let transducer air conditioning operate under the maximal efficiency.
Traditional transducer air conditioning is when detecting the exhaust gas temperature sensor fault of compressor; The just simple compressor that detects is after unlatching a period of time; The detected exhaust gas temperature sensor of system is crossed low critical value or is crossed when being higher than critical value; Just judge the exhaust gas temperature sensor fault, and the method for this judgement exhaust gas temperature sensor fault can't be judged the situation that exhaust gas temperature sensor comes off according to offset or exhaust gas temperature sensor.
Summary of the invention
The object of the invention aims to provide the control method of the compressor exhaust temperature of a kind of flexible operation, cost of manufacture reckoning air-conditioner low, applied widely, to overcome weak point of the prior art.
A kind of control method of calculating the compressor exhaust temperature of air-conditioner by this purpose design; It is characterized in that difference mounting temperature sensor on outdoor heat exchanger and indoor heat exchanger, through external heat exchanger temperature T e of temperature sensor sensing chamber and indoor heat exchanger temperature T c;
The concrete steps of calculating compressor exhaust temperature comprise:
Steps A according to the running frequency fi of detected indoor heat exchanger temperature T c and current compressor, is calculated the temperature correction value Tc ' of indoor heat exchanger, Tc '=Tc+fi/a+b; Wherein, a is the compressor frequency correction factor, and the span of a is 5Hz～40Hz, and b is the compensating value of indoor heat exchanger temperature, and the span of b is-5 ℃～10 ℃;
Step B, according to detected outdoor heat exchanger temperature T e, the temperature correction value Te ' of counting chamber external heat exchanger, Te '=Te+c; Wherein, c is the temperature correction coefficient of outdoor heat exchanger, and the span of c is-5 ℃～10 ℃;
Step C, the temperature curve according to the Te '-Td ' under the temperature correction value Tc ' that preestablishes corresponding different indoor heat exchangers calculates corresponding compressor exhaust temperature presumed value Td ';
Perhaps, according to the temperature curve of the Tc '-Td ' under the temperature correction value Te ' that preestablishes corresponding different outdoor heat exchanger; Calculate corresponding compressor exhaust temperature presumed value Td ';
Step D according to the compressor exhaust temperature presumed value Td ' that step C is calculated, calculates current compressor exhaust temperature value Td, Td=Td '+d; Wherein, d is that delivery temperature is calculated compensating value, and the span of d is 0～20 ℃.
The concrete steps of said reckoning compressor exhaust temperature also comprise the step D1 that is positioned at after the step D,
Step D1 if current compressor is when high frequency turns round, also need increases the running of compressor high frequency and revise, promptly current compressor exhaust temperature value Td=Td '+d+k * (fi-fb); Wherein, fi is the running frequency of current compressor, and fb is a reference value of the high frequency frequency of being moved of compressor, and the span of fb is 70Hz～150Hz, and k is the high frequency running correction factor of compressor, and the span of k is 0.05～0.3.
In step C, the temperature curve of said Te '-Td ' is a temperature correction value Tc ' timing of working as indoor heat exchanger (2), and Td ' is along with the change of the temperature correction value Te ' of outdoor heat exchanger (1) reduces greatly;
Said basis preestablishes the temperature curve of the Te '-Td ' under the temperature correction value Tc ' of corresponding different indoor heat exchanger (2); Preestablished Tc '=the 1st temperature T 1, Tc '=the 2nd temperature T 2, Tc '=the 3rd temperature T 3; ..., Tc '=(m-1) temperature T
M-1, Tc '=m bar curves such as m temperature T m, wherein, the span of m is 3～50;
The curve of described Tc '=the 1st temperature T 1 is divided into n section straight line, the different computing formula of temperature correction value Te ' selection of the outdoor heat exchanger current (1) according to air-conditioner, and wherein, the span of n is 3～50;
As Te '＜Te
1The time, Td '=Td
1
Work as Te
1≤Te '＜Te
2The time, Td '=(Td
2-Td
1) * (Te '-Td
1)/(Td
2-Td
1)+Td
1
Work as Te
3≤Te '＜Te
4The time, Td '=(Td
3-Td
2) * (Te '-Td
2)/(Td
3-Td
2)+Td
2
Work as Te
4≤Te '＜Te
4The time, Td '=(Td
4-Td
3) * (Te '-Td
3)/(Td
4-Td
3)+Td
3
......；
Work as Te
(n-2)≤Te '＜Te
(n-1)The time,
Td′＝(Td
(n-1)-Td
(n-2))×(Te′-Td
(n-2))/(Td
(n-1)-Td
(n-2))+Td
(n-2)；
Work as Te
(n-1)≤Te '＜Te
nThe time,
Td′＝(Td
n-Td
(n-1))×(Te′-Td
(n-1))/(Td
n-Td
(n-1))+Td
(n-1)；
Work as Te
nDuring≤Te ', Td '=Td
n
Wherein, Te
1＜Te
2＜Te
3＜...＜Te
N-2＜Te
N-1＜Te
n
Te
1, Te
2, Te
3..., Te
N-2, Te
N-1, Te
nSpan separately is-50 ℃～100 ℃;
Td
1, Td
2, Td
3, Td
4..., Td
N-2, Td
N-1, Td
n5 ℃～100 ℃ of sampling scopes separately;
Based on identical reason,
The curve of described Tc '=the 2nd temperature T 2 is divided into p section straight line,
Tc '=the 3rd temperature T 3 curves are divided into q section straight line,
Tc '=(n-1) temperature T
N-1Curve be divided into r section straight line,
Tc '=n temperature T
nCurve be divided into s section straight line,
The different computing formula of temperature correction value Te ' selection of the outdoor heat exchanger current (1) according to air-conditioner, the computing formula of the curve of this computing formula and above-mentioned Tc '=the 1st temperature T 1 is similar, just no longer does further describing here; Wherein, p, q; R, the span of s is 3～50;
Calculate corresponding compressor exhaust temperature presumed value Td ' time,
The temperature correction value Tc ' of the indoor heat exchanger (2) that at first, will calculate by steps A and predefined the 1st temperature T the 1, the 2nd temperature T the 2, the 3rd temperature T 3 ..., the m-2 temperature T
M-2, the m-1 temperature T
M-1With the n temperature T
mCompare size, confirm the interval at Tc ' place,
When T1＜Tc '＜T2, then the interval at Tc ' place is [T1, T2], then selects the curve of Tc '=the 1st temperature T 1 and the curve of Tc '=the 2nd temperature T 2,
Secondly, the size of the temperature correction value Te ' of the outdoor heat exchanger that is calculated by step B again (1) is selected the corresponding calculated formula from above computing formula; Calculate the Td ' 1 of compressor exhaust temperature of the curve of Tc '=the 1st temperature T 1 again according to this computing formula of selecting, and the second reckoning value Td ' 2 of the curve compressor exhaust temperature of Tc '=the 2nd temperature T 2;
Afterwards, calculate compressor exhaust temperature presumed value Td ' again, Td '=(Td ' 2-Td ' 1) * (Tc '-T1)/(T2-T1)+Td ' 1,
Based on identical reason,, also calculate compressor exhaust temperature presumed value Td ' according to above similar computational methods as Tc ' during in other temperature ranges;
In the air-condition freezing circulation, the temperature curve of described Tc '-Td ', for working as Te ' regularly, Td ' is along with the change of Tc ' becomes big greatly; The curve that its concrete calculating is finished the work with above-mentioned Te '-Td ' is similarly, also is equivalence fully.
In a period of time t1 that compressor is opened, forbid carrying out compressor exhaust temperature and calculate that the span of t1 is 30s～600s.
When the air conditioner heat-production defrost moves or defrost forbid carrying out compressor exhaust temperature in a period of time t2 when finishing and calculate that the span of t2 is 30s～600s.
After the present invention adopts above-mentioned technical scheme; Through external heat exchanger temperature T e of sensing chamber and indoor heat exchanger temperature T c; Calculate compressor exhaust temperature according to the current compressor operating frequency in the air-conditioning system running again; And the temperature value that can detect through the exhaust gas temperature sensor that the delivery temperature value of extrapolating is installed with system relatively; Judge that whether unusual exhaust gas temperature sensor that system installs or sensor install badly, carry out system frequency control according to the exhaust gas temperature sensor of calculating again, guarantee the maximal efficiency operation of air-conditioner.
The present invention has flexible operation, low, the advantage of wide range of application of cost of manufacture.
Description of drawings
Fig. 1 is the control flow chart of the embodiment of the invention 1.
Fig. 2 is the structural representation of the embodiment of the invention 1.
The temperature profile of Te '-Td ' when Fig. 3 is respectively T1, T2 and T3 for indoor heat exchanger temperature correction value Tc '.
Fig. 4 is among the embodiment 1, the temperature profile of the Te ' of employing-Td '.
Fig. 5 is the control flow chart of the embodiment of the invention 2.
Fig. 6 is the temperature profile of the Tc '-Td ' in the embodiment of the invention 3.
Among the figure: 1 is outdoor heat exchanger, and 2 is indoor heat exchanger, and 3 is compressor, and 4 is throttling arrangement.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further described.
Referring to Fig. 1-Fig. 2, the outdoor system of transducer air conditioning has still been installed the compressor exhaust temperature sensor on the blast pipe of compressor 3, the delivery temperature of sampling compressor 3.Transducer air conditioning is as shown in Figure 2, difference mounting temperature sensor on outdoor heat exchanger 1 and indoor heat exchanger 2, and through heat exchange temperature Tc and outdoor heat exchanger temperature T e in the sensor sensing chamber.
When air-conditioning system judges that the compressor exhaust temperature sensor breaks down, as shown in Figure 1, carry out calculating compressor exhaust temperature according to following steps according to outdoor heat exchanger temperature T e and indoor heat exchanger temperature T c:
Steps A according to the running frequency fi of detected indoor heat exchanger temperature T c and current compressor, is calculated the temperature correction value Tc ' of indoor heat exchanger 2, Tc '=Tc+fi/a+b; Wherein, a is the compressor frequency correction factor, and this correction factor is relevant with the efficient and the air-conditioner of compressor, and the span of a is 5Hz～40Hz; B is the compensating value of indoor heat exchanger temperature, and the span of b is-5 ℃～10 ℃.
Step B, according to detected outdoor heat exchanger temperature T e, the temperature correction value Te ' of counting chamber external heat exchanger 1, Te '=Te+c; Wherein, c is the temperature correction coefficient of outdoor heat exchanger 1, and the span of c is-5 ℃～10 ℃.
Step C, the temperature curve according to the Te '-Td ' under the temperature correction value Tc ' that preestablishes corresponding different indoor heat exchangers 2 calculates corresponding compressor exhaust temperature presumed value Td '; Perhaps, according to the temperature curve of the Tc '-Td ' under the temperature correction value Te ' that preestablishes corresponding different outdoor heat exchanger 1; Calculate corresponding compressor exhaust temperature presumed value Td '.
As shown in Figure 3, in the air-condition freezing circulatory system, the temperature curve of said Te '-Td ' is a temperature correction value Tc ' timing of working as indoor heat exchanger 2, and Td ' is along with the change of the temperature correction value Te ' of outdoor heat exchanger 1 reduces greatly;
Said basis preestablishes the temperature curve of the Te '-Td ' under the temperature correction value Tc ' of corresponding different indoor heat exchanger 2; Preestablished Tc '=the 1st temperature T 1, Tc '=the 2nd temperature T 2, Tc '=the 3rd temperature T 3; ..., Tc '=(m-1) temperature T
M-1, Tc '=m bar curves such as m temperature T m, wherein, the span of m is 3～50;
The curve of described Tc '=the 1st temperature T 1 is divided into n section straight line, and according to the different computing formula of temperature correction value Te ' selection of the current outdoor heat exchanger 1 of air-conditioner, wherein, the span of n is 3～50;
As Te '＜Te
1The time, Td '=Td
1
Work as Te
1≤Te '＜Te
2The time, Td '=(Td
2-Td
1) * (Te '-Td
1)/(Td
2-Td
1)+Td
1
Work as Te
3≤Te '＜Te
4The time, Td '=(Td
3-Td
2) * (Te '-Td
2)/(Td
3-Td
2)+Td
2
Work as Te
4≤Te '＜Te
4The time, Td '=(Td
4-Td
3) * (Te '-Td
3)/(Td
4-Td
3)+Td
3
......；
Work as Te
(n-2)≤Te '＜Te
(n-1)The time,
Td′＝(Td
(n-1)-Td
(n-2))×(Te′-Td
(n-2))/(Td
(n-1)-Td
(n-2))+Td
(n-2)；
Work as Te
(n-1)≤Te '＜Te
nThe time,
Td′＝(Td
n-Td
(n-1))×(Te′-Td
(n-1))/(Td
n-Td
(n-1))+Td
(n-1)；
Work as Te
nDuring≤Te ', Td '=Td
n
Wherein, Te
1＜Te
2＜Te
3＜... Te
N-2Te
N-1＜Te
n
Te
1, Te
2, Te
3..., Te
N-2, Te
N-1, Te
nSpan separately is-50 ℃～100 ℃;
Td
1, Td
2, Td
3, Td
4..., Td
N-2, Td
N-1, Td
n5 ℃～100 ℃ of sampling scopes separately;
Based on identical reason,
The curve of described Tc '=the 2nd temperature T 2 is divided into p section straight line,
Tc '=the 3rd temperature T 3 curves are divided into q section straight line,
Tc '=(n-1) temperature T
N-1Curve be divided into r section straight line,
Tc '=n temperature T
nCurve be divided into s section straight line,
The different computing formula of temperature correction value Te ' selection of the outdoor heat exchanger current (1) according to air-conditioner, the computing formula of the curve of this computing formula and above-mentioned Tc '=the 1st temperature T 1 is similar, just no longer does further describing here; Wherein, p, q; R, the span of s is 3～50;
Calculate corresponding compressor exhaust temperature presumed value Td ' time,
The temperature correction value Tc ' of the indoor heat exchanger (2) that at first, will calculate by steps A and predefined the 1st temperature T the 1, the 2nd temperature T the 2, the 3rd temperature T 3 ..., the m-2 temperature T
M-2, the m-1 temperature T
M-1With the n temperature T
mCompare size, confirm the interval at Tc ' place,
When T1＜Tc '＜T2, then the interval at Tc ' place is [T1, T2], then selects the curve of Tc '=the 1st temperature T 1 and the curve of Tc '=the 2nd temperature T 2,
Secondly, the size of the temperature correction value Te ' of the outdoor heat exchanger that is calculated by step B again (1) is selected the corresponding calculated formula from above computing formula; Calculate the Td ' 1 of compressor exhaust temperature of the curve of Tc '=the 1st temperature T 1 again according to this computing formula of selecting, and the second reckoning value Td ' 2 of the curve compressor exhaust temperature of Tc '=the 2nd temperature T 2;
Afterwards, calculate compressor exhaust temperature presumed value Td ' again, Td '=(Td ' 2-Td ' 1) * (Tc '-T1)/(T2-T1)+Td ' 1,
Based on identical reason,, also calculate compressor exhaust temperature presumed value Td ' according to above similar computational methods as Tc ' during in other temperature ranges;
In the air-condition freezing circulation, the temperature curve of described Tc '-Td ', for working as Te ' regularly, Td ' is along with the change of Tc ' becomes big greatly; The curve that its concrete calculating is finished the work with above-mentioned Te '-Td ' is similarly, also is equivalence fully.
The curve of described Te '-Td '; Be a correction value Tc ' timing of working as the indoor heat exchanger temperature; Compressor exhaust temperature presumed value Td ' is along with the change of Te ' reduces greatly, and predefined temperature curve has according to the correction value Tc ' of indoor heat exchanger temperature from small to large, Tc '=T1; Tc '=T2, Tc '=three temperature curves of T3; The corresponding delivery temperature value of said curve calculation Td ' according to predefined Te '-Td ' finish the work for; At first calculate the value of the indoor heat exchanger temperature correction value Tc ' of current system according to steps A; And with predefined T1; T2, the T3 value is size relatively, confirms the interval at its place; If T1＜Tc '＜T2; The interval of confirming the indoor heat exchanger temperature correction value Tc ' place of current system is [T1, T2], calculates the outdoor heat exchange actuator temperature correction value Te '=Te ' 1 of current system and then according to step B; According to the indoor heat exchanger temperature correction value Tc ' of current system at [T1; T2] the interval, calculate correction value Tc '=T1 and outdoor heat exchange actuator temperature correction value Te '=1 o'clock the compressor exhaust temperature reckoning value Td ' 1 of Te ' of indoor heat exchanger temperature and compressor exhaust temperature reckoning value Td ' 2 during as the correction value Tc '=T2 of indoor heat exchanger temperature and outdoor heat exchange actuator temperature correction value Te '=Te ' 1 at curve map as shown in Figure 3, afterwards; Again according to the correction value Tc ' of heat exchange temperature in the current system chambers, according to following linear computing formula draw compressor exhaust temperature reckoning value Td '=(Td ' 2-Td ' 1) of current system * (Tc '-T1)/(T2-T1)+Td ' 1.
Step D according to the compressor exhaust temperature presumed value Td ' that step C is calculated, calculates current compressor exhaust temperature value Td, Td=Td '+d; Wherein, d is that delivery temperature is calculated compensating value, and the span of d is 0～20 ℃.
Be that 35 the Actual-Temperature-Points of transducer air conditioning when heating mode carries out detailed explanation to the control method of calculating compressor exhaust temperature below in conjunction with model.When the current running frequency of compressor is fi=60hz, current indoor heat exchanger temperature T c is 41 ℃, and outdoor heat exchanger temperature T e is-9 ℃; The preset 10hz that is decided to be of compressor frequency correction factor a; The compensating value b of indoor heat exchanger temperature is 0, and the temperature correction coefficient c of outdoor heat exchanger 1 is-2, and delivery temperature calculates that compensating value d is 5 ℃. judge that at first system is whether in a period of time t1 that compressor is opened; Perhaps when the air conditioner heat-production defrost moves or defrost when finishing in a period of time t2; If do not satisfy, just carry out compressor exhaust temperature and calculate control, secondly calculate Tc '=Tc+fi/a+b=41+60/10+0=47 ℃ according to formula; Calculate Te '=Te+c=-9+ (2)=-11 ℃ once more,
As shown in Figure 4, the curve that presets Te '-Td ' has Tc '=20 ℃, 40 ℃; 50 ℃; 60 ℃, 80 ℃ of totally five Te '-Td ' temperature curves, thus the Tc ' that confirms current system is in 40～50 temperature ranges; Corresponding temperature spot is Td ' 1=78 ℃ when drawing Tc '=40 ℃ through current Te '=-11 ℃ computation of table lookup again; Temperature spot corresponding during Tc '=50 ℃ is Td ' 2=93 ℃, according to linear computing formula Td '=(Td ' 2-Td ' 1) * (Tc '-T1)/(T2-T1)+Td ' 1=(93-78) * (47-40)/(50-40)+78=88.5 ℃, carry out delivery temperature reckoning value correction Td=Td '+d=88.5+5=93.5 ℃ at last again.
As stated; This transducer air conditioning has adopted the control method according to indoor heat exchanger temperature and outdoor heat exchange actuator temperature reckoning compressor exhaust temperature; After can breaking down at the exhaust gas temperature sensor of air-conditioner, still can carry out the estimation of system loading size, limit frequently or stoppage protection according to the reckoning value of delivery temperature; The safe operation of assurance system maximal efficiency, and need not after sensor fault occurring, to do to shut down to handle.
The difference of the control method of present embodiment and embodiment 1 air-conditioner is; Shown in the flow chart of Fig. 5; The transducer air conditioning of this embodiment is owing to can run high frequency; Carry out compressor high frequency running correction so increased step D1,, also need increase compressor high frequency running correction Td=Td '+d+k * (fi-fb) if when judging current compressor when high frequency turn round; Fi is the running frequency of current compressor, and fb is a reference value of the high frequency frequency of being moved of compressor, and the span of fb is 70Hz～150Hz, and k is the high frequency running correction factor of compressor, and the span of k is 0.05～0.3.
Judge: when the current running frequency fi of compressor＞fb, carry out the running of compressor high frequency and revise, revise otherwise do not carry out the running of compressor high frequency; Detailed control method of other calculating and embodiment one are similar, no longer do further description.
As stated; This transducer air conditioning is when high frequency turns round; Calculate that according to indoor heat exchanger temperature and outdoor heat exchange actuator temperature the control method of the delivery temperature of compressor has increased the running of compressor high frequency and revised; Make compressor when running high frequency, the delivery temperature value of calculating out is more accurate, can better carry out compressor limit frequency or stoppage protection.
The air-conditioner of present embodiment is different with the air-conditioner of above each embodiment to be; It adopts the control method according to the delivery temperature of evaporator temperature and outdoor heat exchange actuator temperature reckoning compressor; The temperature value comparison of compressor exhaust temperature that relatively calculates and exhaust gas temperature sensor sampling; When these two temperature value deviation ratios are big; Judge that the compressor exhaust temperature sensor comes off or fault; This embodiment adopts the step and the embodiment one of the control method of calculating compressor exhaust temperature similar, and just the computational methods among the step C have adopted the curve that preestablishes the Tc '-Td ' under the corresponding different Te ', calculate corresponding compressor exhaust temperature reckoning value Td '; Shown in Tc '-Td ' temperature curve sketch map of Fig. 6; When the correction value Te ' of outdoor heat exchange actuator temperature one timing; Compressor exhaust temperature presumed value Td ' is along with the change of Tc ' becomes big greatly, and predefined temperature curve has according to the correction value Te ' of outdoor heat exchange actuator temperature from small to large, Te '=T4; Te '=T5, Te '=three temperature curves of T6; At first according to the outdoor heat exchange actuator temperature correction value Te ' value of step current system that B calculates, and with predefined T3, T4, the T5 value is size relatively, confirms the interval at its place; If T4＜Te '＜T5; The interval of confirming the indoor heat exchanger temperature correction value Te ' place of current system is [T4; T5]; Calculate the indoor heat exchanger temperature correction value Tc '=Tc ' 1 of current system and then according to steps A; Compressor exhaust temperature reckoning value Td ' 4 during the compressor exhaust temperature reckoning value Td ' 3 when the Tc '-Td ' temperature curve sketch map like Fig. 6 calculates as the correction value Te '=T4 of outdoor heat exchange actuator temperature and the correction value Tc ' of indoor heat exchanger temperature=Tc ' 1 and when the correction value Tc ' of indoor heat exchanger temperature=Tc ' 1 and the correction value Te ' of outdoor heat exchange actuator temperature=T5; Afterwards again according to current Te ', according to following linear computing formula draw compressor exhaust temperature reckoning value Td '=(Td ' 4-Td ' 3) of current system * (Te '-T4)/(T5-T4)+Td ' 3;
As stated; Present embodiment adopts the control method according to the delivery temperature of indoor heat exchanger temperature and outdoor heat exchange actuator temperature reckoning compressor; Can be good at judging whether the compressor exhaust temperature sensor comes off or fault; Further adopt the compressor exhaust temperature value of calculating to carry out system again and limit frequency or stop control, and electronic expansion valve opening control.
The above embodiment is merely the preferred embodiments of the present invention, is not limited to present embodiment, says to those skilled in the art, and the present invention can have various changes and variation.All any modifications of within spirit of the present invention and principle, being done are equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. a control method of calculating the compressor exhaust temperature of air-conditioner is characterized in that going up mounting temperature sensor respectively at outdoor heat exchanger (1) and indoor heat exchanger (2), through external heat exchanger temperature T e of temperature sensor sensing chamber and indoor heat exchanger temperature T c;
The concrete steps of calculating compressor exhaust temperature comprise:
Steps A according to the running frequency fi of detected indoor heat exchanger temperature T c and current compressor, is calculated the temperature correction value Tc ' of indoor heat exchanger (2), Tc '=Tc+fi/a+b; Wherein, a is the compressor frequency correction factor, and the span of a is 5Hz～40Hz, and b is the compensating value of indoor heat exchanger temperature, and the span of b is-5 ℃～10 ℃;
Step B, according to detected outdoor heat exchanger temperature T e, the temperature correction value Te ' of counting chamber external heat exchanger (1), Te '=Te+c; Wherein, c is the temperature correction coefficient of outdoor heat exchanger (1), and the span of c is-5 ℃～10 ℃;
Step C, the temperature curve according to the Te '-Td ' under the temperature correction value Tc ' that preestablishes corresponding different indoor heat exchangers (2) calculates corresponding compressor exhaust temperature presumed value Td ';
Perhaps, according to the temperature curve of the Tc '-Td ' under the temperature correction value Te ' that preestablishes corresponding different outdoor heat exchanger (1); Calculate corresponding compressor exhaust temperature presumed value Td ';
Step D according to the compressor exhaust temperature presumed value Td ' that step C is calculated, calculates current compressor exhaust temperature value Td, Td=Td '+d; Wherein, d is that delivery temperature is calculated compensating value, and the span of d is 0～20 ℃.
2. the control method of the compressor exhaust temperature of reckoning air-conditioner according to claim 1, the concrete steps that it is characterized in that said reckoning compressor exhaust temperature also comprise the step D1 that is positioned at after the step D,
Step D1 if current compressor is when high frequency turns round, also need increases the running of compressor high frequency and revise, promptly current compressor exhaust temperature value Td=Td '+d+k * (fi-fb); Wherein, fi is the running frequency of current compressor, and fb is a reference value of the high frequency frequency of being moved of compressor, and the span of fb is 70Hz～150Hz, and k is the high frequency running correction factor of compressor, and the span of k is 0.05～0.3.
3. the control method of the compressor exhaust temperature of reckoning air-conditioner according to claim 1; It is characterized in that in step C; The temperature curve of said Te '-Td '; Be a temperature correction value Tc ' timing of working as indoor heat exchanger (2), Td ' is along with the change of the temperature correction value Te ' of outdoor heat exchanger (1) reduces greatly;
Said basis preestablishes the temperature curve of the Te '-Td ' under the temperature correction value Tc ' of corresponding different indoor heat exchanger (2); Preestablished Tc '=the 1st temperature T 1, Tc '=the 2nd temperature T 2, Tc '=the 3rd temperature T 3; ..., Tc '=(m-1) temperature T
M-1, Tc '=m bar curves such as m temperature T m, wherein, the span of m is 3～50;
The curve of described Tc '=the 1st temperature T 1 is divided into n section straight line, the different computing formula of temperature correction value Te ' selection of the outdoor heat exchanger current (1) according to air-conditioner, and wherein, the span of n is 3～50;
As Te '＜Te
1The time, Td '=Td
1
Work as Te
1≤Te '＜Te
2The time, Td '=(Td
2-Td
1) * (Te '-Td
1)/(Td
2-Td
1)+Td
1
Work as Te
3≤Te '＜Te
4The time, Td '=(Td
3-Td
2) * (Te '-Td
2)/(Td
3-Td
2)+Td
2
Work as Te
4≤Te '＜Te
4The time, Td '=(Td
4-Td
3) * (Te '-Td
3)/(Td
4-Td
3)+Td
3
......；
Work as Te
(n-2)≤Te '＜Te
(n-1)The time,
Td′＝(Td
(n-1)-Td
(n-2))×(Te′-Td
(n-2))/(Td
(n-1)-Td
(n-2))+Td
(n-2)；
Work as Te
(n-1)≤Te '＜Te
nThe time,
Td′＝(Td
n-Td
(n-1))×(Te′-Td
(n-1))/(Td
n-Td
(n-1))+Td
(n-1)；
Work as Te
nDuring≤Te ', Td '=Td
n
Wherein, Te
1＜Te
2＜Te
3＜...＜Te
N-2＜Te
N-1＜Te
n
Te
1, Te
2, Te
3..., Te
N-2, Te
N-1, Te
nSpan separately is-50 ℃～100 ℃;
Td
1, Td
2, Td
3, Td
4..., Td
N-2, Td
N-1, Td
n5 ℃～100 ℃ of sampling scopes separately;
Based on identical reason,
The curve of described Tc '=the 2nd temperature T 2 is divided into p section straight line,
Tc '=the 3rd temperature T 3 curves are divided into q section straight line,
Tc '=(n-1) temperature T
N-1Curve be divided into r section straight line,
Tc '=n temperature T
nCurve be divided into s section straight line,
The different computing formula of temperature correction value Te ' selection of the outdoor heat exchanger current (1) according to air-conditioner, the computing formula of the curve of this computing formula and above-mentioned Tc '=the 1st temperature T 1 is similar, just no longer does further describing here; Wherein, p, q; R, the span of s is 3～50;
Calculate corresponding compressor exhaust temperature presumed value Td ' time,
The temperature correction value Tc ' of the indoor heat exchanger (2) that at first, will calculate by steps A and predefined the 1st temperature T the 1, the 2nd temperature T the 2, the 3rd temperature T 3 ..., the m-2 temperature T
M-2, the m-1 temperature T
M-1With the n temperature T
mCompare size, confirm the interval at Tc ' place,
When T1＜Tc '＜T2, then the interval at Tc ' place is [T1, T2], then selects the curve of Tc '=the 1st temperature T 1 and the curve of Tc '=the 2nd temperature T 2,
Secondly, the size of the temperature correction value Te ' of the outdoor heat exchanger that is calculated by step B again (1) is selected the corresponding calculated formula from above computing formula; Calculate the Td ' 1 of compressor exhaust temperature of the curve of Tc '=the 1st temperature T 1 again according to this computing formula of selecting, and the second reckoning value Td ' 2 of the curve compressor exhaust temperature of Tc '=the 2nd temperature T 2;
Afterwards, calculate compressor exhaust temperature presumed value Td ' again, Td '=(Td ' 2-Td ' 1) * (Tc '-T1)/(T2-T1)+Td ' 1,
Based on identical reason,, also calculate compressor exhaust temperature presumed value Td ' according to above similar computational methods as Tc ' during in other temperature ranges;
In the air-condition freezing circulation, the temperature curve of described Tc '-Td ', for working as Te ' regularly, Td ' is along with the change of Tc ' becomes big greatly; The curve that its concrete calculating is finished the work with above-mentioned Te '-Td ' is similarly, also is equivalence fully.
4. the control method of the compressor exhaust temperature of reckoning air-conditioner according to claim 1 is characterized in that in a period of time t1 that compressor is opened, forbidding carrying out compressor exhaust temperature calculates that the span of t1 is 30s～600s.
5. the control method of the compressor exhaust temperature of reckoning air-conditioner according to claim 1; It is characterized in that when the air conditioner heat-production defrost moves or defrost is forbidden carrying out compressor exhaust temperature in a period of time t2 when finishing and calculated that the span of t2 is 30s～600s.
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