CN101586865A - Fuzzy control method for air conditioner and system thereof - Google Patents

Abstract

The invention discloses a fuzzy control method for an air conditioner and a system thereof. The system comprises a fluctuation detection module aiming at exhaust temperature, a fuzzy controller, a PID control module, a limit value adjusting module and a valve control module. By acquiring exhaust temperature signals and detecting whether the exhaust temperature signals are in a fluctuation state, the opening degree of an electronic expansion valve is changed through feedback control, and the pressure fluctuation is effectively eliminated; and simultaneously, under the condition of not increasing the cost, the stability of the system is enhanced and the service life of the system is prolonged.

Description

A kind of fuzzy control method of air-conditioning and system thereof

Technical field

The present invention relates to a kind of fuzzy control method and system thereof, especially a kind of fuzzy control method of air-conditioning and system thereof.

Background technology

When the long pipe arrangement of unit machine and multi-gang air-conditioner turns round, under some working condition, can produce pressure fluctuation.Pressure, electric current, delivery temperature cyclic fluctuation.There is substantial connection in alternately melting of refrigerant gas-liquid two-phase, particularly more common in the circulatory system of having only an electric expansion valve (or capillary) (indoor and outdoor all has the system of electric expansion valve not have this fluctuation substantially) in the reason that fluctuation produces and the circulatory system.

Though the pulsation of the short term pressure of air-conditioning there is no big harm, when the pulsation long-term existence, will influence the stability of system, can reduce the service life of air-conditioning when serious.

Therefore, the pressure fluctuation that how to solve air-conditioning becomes the control problem that needs to be resolved hurrily.

Summary of the invention

In view of this, the present invention is devoted to solve the pressure fluctuation problem of air-conditioning, has proposed a kind of fuzzy control method and system thereof of air-conditioning.

According to a first aspect of the invention, provide a kind of air-conditioning fuzzy control method.This method comprises the steps:

Step 1: gather the exhaust temperature signal Td of air conditioner circulating system in real time, detect whether there is fluctuation;

Step 2: when detecting the fluctuation of air conditioner circulating system, calculate the amplitude of variation Δ A of delivery temperature Td, and the Td0 value and the initial setting temperature T d that calculate historical record _IntDifference e;

Step 3: e and Δ A are carried out Fuzzy processing, and adjust the control law of air conditioner circulating system;

Step 4:, adjust the aperture of air conditioner electronic expansion valve in real time according to the control law of air conditioner circulating system.

A kind of Fuzzy control system of air-conditioning is provided according to a second aspect of the invention.This system comprises:

The surge detection module, gather the exhaust temperature signal Td of air conditioner circulating system in real time, detect and whether have fluctuation, when having fluctuation, the exhaust temperature signal Td value of gathering is sent to fuzzy controller, and, when not having fluctuation, the exhaust temperature signal Td value of gathering is fed back to pid control module;

Fuzzy controller is to the amplitude of variation Δ A of delivery temperature Td and the Td0 value and the initial setting temperature T d of historical record _IntDifference e carry out Fuzzy processing, and carry out fuzzy reasoning and reverse gelatinization according to the control law table and handle, export new Td0 to pid control module;

Pid control module is controlled according to the Td0 value of fuzzy controller generation or the Td value of surge detection module feedback, generates the aperture deviate of corresponding electric expansion valve;

The limit value adjusting module, the aperture deviate of the electric expansion valve that generates according to pid control module and the actual opening value of electric expansion valve carry out the limit value adjustment to the aperture of the electric expansion valve after calculating and handle; And

Valve control module through adjusting the aperture of the electric expansion valve of handling, is carried out working control to the aperture of electric expansion valve according to the limit value adjusting module.

The present invention is by gathering exhaust temperature signal, and detects it and whether be in fluctuation status, by FEEDBACK CONTROL, changes the aperture of electric expansion valve, effectively eliminated pressure fluctuation; Simultaneously,, eliminated pressure fluctuation, strengthened the stability of system and prolonged the service life of system not increasing under the condition of cost.

Description of drawings

Below with reference to accompanying drawings specific embodiments of the present invention is described in detail, wherein:

Fig. 1 is a Fuzzy control system structure chart of the present invention;

Fig. 2 is that the present invention is made zero and resetted and make zero control flow chart;

Fig. 3 is the present invention's expansion valve opening control chart when defrosting;

Fig. 4 is the control sequential chart of the present invention when shutting down;

Fig. 5 is the setting process figure of the present invention target temperature value Tdo when freezing; And

Fig. 6 is the setting process figure of the present invention target temperature value Tdo when heating.

The specific embodiment

In order to solve the pressure fluctuation problem of air-conditioning, the invention provides a kind of fuzzy control method and system thereof of air-conditioning.Next specify this fuzzy control method and system thereof.

One, fuzzy control principle

The relative theory of fuzzy control of the present invention once at first, is described.

Fuzzy control is a kind of control algolithm that grows up on the fuzzy set theory basis of Zha De, its remarkable advantage has been bypassed the control mathematics model exactly, according to expert's knowledge and operating experience, realize Based Intelligent Control to object by fuzzy operation and fuzzy reasoning.This has remedied the limitation of traditional control algolithm to a great extent.Fuzzy control is a kind of macro approach to system's control, and its core is the control law that describes in words, if use usually ... then ... mode (IF...THEN...) is expressed the knowledge and experience of expert in the working control.Therefore, the description that is used for switch valve control system just seems very simple.

The fuzzy control method of air-conditioning comprises the steps: among the present invention

1. gather the exhaust temperature signal Td of air conditioner circulating system in real time, detect air conditioner circulating system and whether have fluctuation.

2. when detecting the fluctuation of air conditioner circulating system, calculate the amplitude of variation Δ A of delivery temperature Td, and the Td0 value and the initial setting temperature T d that calculate historical record _IntDifference e.

3. e and Δ A are carried out Fuzzy processing, and adjust the control law of air conditioner circulating system.

4. according to the control law of air conditioner circulating system, adjust the aperture of air conditioner electronic expansion valve in real time.

When detecting fluctuation generation, the control law of air conditioner circulating system remains unchanged, and keeps the aperture of air conditioner electronic expansion valve constant, does not also promptly need to carry out Fuzzy processing and follow-up processing.

The control law of above-mentioned adjustment air conditioner circulating system is mainly realized by adjusting the control law table.Wherein, in the control law table, the Td0 value plays the most direct effect, and pid control module is just according to the control of the Td0 value realization that constantly refreshes to final stage control module (electric expansion valve).

Two, Fuzzy control system

Next, in conjunction with figure fuzzy control method of the present invention and system are carried out deep explanation.

Fig. 1 illustrates Fuzzy control system structure chart of the present invention.As shown in Figure 1, this system comprises surge detection module 500, fuzzy controller 100, pid control module 200, limit value adjusting module 300 and valve control module 400.

Surge detection module 500 is gathered the exhaust temperature signal Td of air conditioner circulating system in real time, detects whether there is fluctuation, when having fluctuation, the exhaust temperature signal Td value of gathering is sent to fuzzy controller; And, when not having fluctuation, the exhaust temperature signal Td value of gathering is fed back to pid control module.

The amplitude of variation Δ A of 100 couples of delivery temperature Td of fuzzy controller and the Td0 value of historical record and initial setting temperature T d _IntDifference e carry out Fuzzy processing, and carry out fuzzy reasoning and reverse gelatinization according to the control law table and handle, export new Td0 to pid control module.

Pid control module 200 is controlled according to the Td0 value of fuzzy controller generation or the Td value of surge detection module feedback, generates the aperture deviate of corresponding electric expansion valve.

Limit value adjusting module 300 carries out the limit value adjustment to the aperture of the electric expansion valve after calculating and handles according to the aperture deviate of the electric expansion valve of pid control module generation and the actual opening value of electric expansion valve.

Valve control module 400 through adjusting the aperture of the electric expansion valve of handling, is carried out working control to the aperture of electric expansion valve according to the limit value adjusting module.

Make detailed supplementary notes with regard to the correlation module of Fuzzy control system of the present invention below.

One, electric expansion valve

What above-mentioned electronic Expansion Valve Control need remark additionally is: the target control parameter of electric expansion valve is used pressure at expulsion Pd or delivery temperature Td (following is the example explanation with Td) usually.

When the Td temperature is higher than desired value Tdo to a certain degree the time, valve opening is opened greatly; When the Td temperature is lower than desired value Tdo to a certain degree the time, valve opening turns down; When Td temperature during near desired value Tdo, valve opening remains unchanged.Tdo is by Td0, Td1, and Td2, many factors of Td3... determine (details is controlled with reference to PID) jointly, wherein Td0 can adjust according to the judged result of Td fluctuation as a temperature initial value.Adjust the back system and still follow PID control, just the Td0 value is changed and is kept.

Two, structure of fuzzy controller and design

The Mathematical Modeling of pressure fluctuation:

P(t)＝A(t)sin(ωt)+P _c

$A\left(t\right)=\frac{A_1}{x_{\mathrm{evo}}\left(t\right)-f(y_1,y_2,....)}$

About the explanation of formula, A ₁Be one near 0 definite value, P _cForce value during for system stability, f (y ₁, y ₂... .) be the intrinsic valve opening value of system by a plurality of factor decisions such as compressor, pipeline, heat exchanger.

Work as x _Evo(t)-f (y ₁, y ₂... .) value keep off at 0 o'clock, A (t) ≈ 0, P (t) ≈ P _cSo as long as control electronic expansion valve opening x _Evo(t) away from f (y ₁, y ₂... .), system just can not fluctuate.

In conjunction with the Mathematical Modeling of above pressure fluctuation as can be known, complete control system generally is made of controller, final stage control module, controlled device and sensor.Electric expansion valve is equivalent to the final stage control module of control system, and the delivery temperature of compressor is a controlled device then, and sensor returns delivery temperature.As shown in Figure 1, this system in its entirety is obeyed PID control, but a key parameter Td0 of PID control is generated by fuzzy controller again.The control cycle of PID control is 1 minute, and the adjustment cycle of fuzzy control is 5 minutes.

From the pie graph of system as can be known, the basic input of fuzzy controller has two, one of factor of determination of target control temperature T do Td0 and Td _IntDifference e and the variation amplitude Δ A of delivery temperature.The waveform determination module will be exported the real-time amplitude and the cycle of fluctuation.(the fluctuation amplitude that occurs in the experiment is 3 degree, and the cycle is 3 minutes)

(1) obfuscation of input/output signal

The following expression of fuzzy set after Td0 deviation e and the fluctuation amplitude Δ A obfuscation: { e _-5, e _-4, e _-3, e _-2, e _-1, e ₀, e ₁, e ₂, e ₃, e ₄, e ₅, { FLAT, TRANSITION, WAVE}

Here according to field condition the Td0 deviation 11 shelves have been divided into.The change of amplitude is divided into 3 grades, and the expression implication is respectively that FLAT represents ripple disable, and TRANSITION is a transition state, and WAVE is for there being fluctuation.Definition:

$e=\left\{\begin{array}{ccc}{e}_{-5}& \mathrm{if}& e={\mathrm{Td}}_{\mathrm{int}}-Z_a\\ {\mathrm{<figure-callout\; id="5"\; label="e"\; filenames="A2009100164980023H1.png,A2009100164980024H1.png"\; state="\{\{state\}\}">e</figure-callout>}}_5& \mathrm{if}& e={\mathrm{Td}}_{\mathrm{int}}+Z_a\end{array}\right.$

$e=\left\{\begin{array}{ccc}{e}_{-4}& \mathrm{if}& e={\mathrm{Td}}_{\mathrm{int}}-Z_b\\ e_4& \mathrm{if}& e={\mathrm{Td}}_{\mathrm{int}}+Z_b\end{array}\right.$

$e=\left\{\begin{array}{ccc}{e}_{-3}& \mathrm{if}& e={\mathrm{Td}}_{\mathrm{int}}-Z_c\\ e_3& \mathrm{if}& e={\mathrm{Td}}_{\mathrm{int}}+Z_c\end{array}\right.$

$e=\left\{\begin{array}{ccc}{e}_{-2}& \mathrm{if}& e={\mathrm{Td}}_{\mathrm{int}}-Z_d\\ e_2& \mathrm{if}& e={\mathrm{Td}}_{\mathrm{int}}+Z_d\end{array}\right.$

$e=\left\{\begin{array}{ccc}{e}_{-1}& \mathrm{if}& e={\mathrm{Td}}_{\mathrm{int}}-Z_e\\ e_1& \mathrm{if}& e={\mathrm{Td}}_{\mathrm{int}}+Z_e\end{array}\right.$

e＝e ₀ if e＝Z ₀＝Td _int

Here Z _a, Z _b, Z _c, Z _d, Z _e, Z ₀Be the constant of prior setting, can adjust according to actual conditions.

Equally, the fluctuation amplitude Δ A of fluctuation decision function output is divided into third gear.Be defined as follows:

$\mathrm{\&Delta;A}=\left\{\begin{array}{ccc}\mathrm{FLAT}& \mathrm{if}& \mathrm{\&Delta;A}<+M_m\\ \mathrm{TRANSITION}& \mathrm{if}& \mathrm{\&Delta;}{A}_m\&Element;[M_m,M_n]\\ \mathrm{WAVE}& \mathrm{if}& \mathrm{\&Delta;A}>+M_n\end{array}\right.$

Wherein, M _mEnergy and M _nFor changing, the Td amplitude of setting in advance judges constant.

At the fluctuation problem that occurs on the engineering, in conjunction with the empirical parameter of accumulation in the experiment.The design adopts following vague definition to the correction of Td0, has also realized the fuzzy control to electric expansion valve simultaneously indirectly:

{plus，reverse，minus，motionless}

Here plus represents Td0+n degree (n is a positive integer, can be according to the actual conditions adjustment, the concrete numeral of following n is identical, gets 2), and reverse represent the Td0-6n degree, and minus represents the Td0-n degree, the maintenance of motionless representation parameter.

(2) fuzzy reasoning

The input e of fuzzy controller is to link together by fuzzy rule between the Δ A, and fuzzy control rule is described with the if...then... statement: if e is A, Δ p is B then U isC.Wherein, A, B, C represents the fuzzy subset.Fuzzy control rule is according to drawing after the operating experience at scene and the in-depth analysis to system, and obtains through concluding.

Be that the circulatory system with R410A constant speed machine is an example below, experimental data that obtains and pressure oscillation figure are as follows:

Table-1

Can be drawn by interpretation, the circulatory system of R410A constant speed machine is the electric expansion valve throttling, and is positioned at outdoorly, and indoor set does not have throttle part.When long pipe arrangement refrigeration test, refrigerant degree of supercooling after the expansion valve throttling very little (near 0K), and the long 50m of pipe arrangement pipeline, from measured data, the pressure drop of liquid pipe is 0.58MPa, caused to occur the two-phase refrigerant in the long pipe arrangement pipeline and flow,, thereby produced fluctuations such as suction and discharge pressure, delivery temperature because of the variable density of two-phase refrigerant has caused the fluctuation of systemic circulation coolant quantity.And this fluctuation can be eliminated by suitable adjustment electronic expansion valve opening.

(3) control law

Eliminate air conditioner circulating system, need adjust control law.Concrete method of adjustment is with reference to following table:

Table-2

Three, making zero in the fuzzy control resets and makes zero control

Fig. 2 illustrates the present invention and makes zero and reset and make zero control flow chart.

One, shown in Fig. 2 a, not clear behind the power supply electrifying because of electronic expansion valve opening, with the valve full cut-off, be convenient to the aperture of correct control valve.

The control of when following condition is set up, making zero and resetting:

1. chip reset (power on, program fleet resets).

When 2. abnormal alarm or retry are shut down.

3. the resetting time condition of making zero is set up the back and is implemented to force Thermo OFF to shut down, and carries out expansion valve and makes zero and reset.

Describe with regard to its concrete process below.

Step 200 beginning.

Step 202, the pulse of closing electric expansion valve of sending 700pls.

Then, in step 204, send the pulse of closing electric expansion valve of 8pls again.

Step 206 finishes this control procedure that makes zero and reset.

Two, shown in Fig. 2 b, in the control, confirm existing aperture full cut-off usually by following condition.The control of when following condition is set up, making zero:

1. operation stops the instruction aperture of (compressor shutdown) back expansion valve when being 0pls;

2. making zero when control of making zero beyond the control of resetting.

Describe with regard to its concrete process below.

Step 210 beginning.

Step 212, the aperture of current electric expansion valve are added the pulse of closing electric expansion valve of sending 40pls.

Then, in step 214, send the pulse of closing electric expansion valve of 8pls again.

Step 216 finishes this control procedure that makes zero.

Three, the value of electronic expansion valve opening

Under different controlled condition, all to consider the value of electronic expansion valve opening.With the example in Fig. 1 mode is reference, the maximum of its outdoor expansion valve, minimum of a value such as following table:

Table-3

Four, startup in the fuzzy control and when defrosting control

Before the expansion valve opening control, the aperture of electric expansion valve when starting once is described first when in introducing Fig. 3, defrosting.

The so-called state that is meant the compressor starts operation that starts.

1. the aperture during cooling activation

Table-4

Fixing time=30 of aperture second during startup.

Ta: outdoor environment temperature

2. heat the aperture when starting

During cross valve OFF: EVO=150pls

During cross valve ON:

Expansion valve opening value during startup sees the following form:

Table-5

Fixing time=2 of aperture minute during startup.

Ta: outdoor environment temperature.

What need supplementary notes is:

1.2 in minute, keep the opening value (variation of environment temperature does not influence) of expansion valve when initial;

2. the expansion valve initial fixation aperture after defrosting, the environment temperature of the value of outdoor environment temperature Ta after the defrosting.

Expansion valve opening control chart when Fig. 3 illustrates the present invention and defrosts.Aperture when expansion valve opening when as shown in Figure 3, the expansion valve opening during defrosting mainly comprises the defrosting beginning and defrosting.

1. the expansion valve opening when defrosting begins

Aperture=480pls during the defrosting beginning;

Set time=30 second of aperture.

2. the aperture when defrosting

Control cycle: 60 seconds;

When being example with the R410A type, above-mentioned coefficient Y1, Y2, the value of Y3 is as follows:

Table-6

What need supplementary notes is:

1. the minimum aperture when defrosting is 140pls;

2. the startup after defrosting finishes is applicable to and heats start-up control that the aperture that electric expansion valve is fixed as when starting adds 2 minutes again.But, when defrosting finishes, during Td＞115 ℃, keep EVO after 480pls adds 1 minute again, to change start-up control again over to earlier.

Five, control during the shutdown in the fuzzy control

Control sequential chart when Fig. 4 illustrates the present invention and shuts down.As shown in Figure 4, when Thermo Off or SW OFF shut down,, control by following enforcement for the height pressure (freezing, heat general) of balance sysmte:

1. when receiving stopping signal, off-premises station sends the instruction aperture of 8pls, continues 30 seconds;

2. afterwards valve opening is arrived 190pls, continue 90 seconds;

3. make zero afterwards after the control, the instruction aperture is 8pls.

Six, control during common in the fuzzy control

Part below illustrates the electronic Expansion Valve Control when common.The target of its control is: according to the control of the delivery temperature Td on compressor expansion valve opening, and then control Td makes it near target exhaust temperature Td0 '.

At first make eye bright and mark the setting of delivery temperature Tdo.

1. the target temperature value under the standard conditions (Td0 ')

The design object exhaust degree of superheat under the standard conditions is 40 ℃, and target temperature value is as shown in the table:

Table-7

2. the calculating of target temperature value (Tds) on the compressor

Tds＝Td0’+Td1+Td2+Td3+Td4+Td5

In the formula,

Td1=f (indoor return air temperature)

Td2=f (outdoor environment temperature)

Td3=f (indoor fan wind shelves)

Td4=f (defrosting beginning temperature conditions usually)---when only heating

Td5=f (piping length correction)

Each CALCULATION OF PARAMETERS is as follows:

A) influence of indoor return air temperature: Td1

Td1=0.25 during refrigeration * (Tin-27)

Td1=Tin-20 when heating

Tin: indoor return air temperature

Table-8

B) influence of outdoor environment temperature: Td2

30℃≤Ta Td2＝(Ta-35)×1.5

10℃≤Ta＜

Td2=-5 during refrigeration

30℃

Ta＜10℃ Td2＝Ta-15(R410A)

Td2=0.5 when heating * (Ta-7)

Ta: outdoor environment temperature

Table-9

C) influence of indoor fan wind shelves: Td3

Td3=0 during refrigeration

Td3=10 when SLo or Lo

Td3=5 during Me when heating

Td3=0 during Hi

D) defrosting begins the influence of temperature conditions: Td4 usually

The temperature conditions Td4=-10 of the Te≤beginning that defrosts usually

When heating

Other Td4=0

Te: outdoor coil pipe used temperature

Table-10

The common defrosting here begins temperature conditions and is meant:

During Ta 〉=6 ℃:

In the time of in press starts 10 minutes, and Te≤ CS1℃;

In the time of between press starts 10 to 20 minutes, and Te≤ CS2℃;

When press starts more than 20 minutes, and Te≤ CS3℃.

During Ta＜6 ℃:

Te≤ CS4

The value at above underscore place sees the following form with formula: (identical with the temperature conditions of common defrosting)

R410A

CS1 -8

CS2 -5

CS3 -2

CS4 (11×Ta-107)/16

Table-11

E) piping length correction: Td5

Piping length R410A

0～30m 0

30m above 10

Table-12

Next, the assignment procedure of target temperature value Tdo is described in conjunction with Fig. 5 and Fig. 6.

The setting process figure of target temperature value Tdo when Fig. 5 illustrates the present invention and freezes.As shown in Figure 5, step 500, the assignment procedure of target temperature value Tdo begins during refrigeration.

Then enter in the step 502, judge whether Y55C is in opening, if not, return this step before, reenter step 502 and judge; If opening then enters step 504.

Step 504 is set Tdo=100 ℃ of initial target temperature value.

Step 506, Timer is zero clearing 1..

Step 508,1. Timer starts.

Step 510 judges whether compressor is in closed condition, if, then return step 502, rejudge Y55C and whether be in opening, and order is carried out subsequent step; If not, then enter in the step 512, judge 1. whether Timer passed through 3 minutes.

If not, then return step 510, rejudge compressor and whether be in closed condition and carry out subsequent step; If then enter step 514.

Step 514,2. Timer carries out zero clearing.

Step 516,2. Timer starts.

Enter then in the step 520, judge whether compressor is in closed condition, if, then return step 502, rejudge Y55C and whether be in opening, and order is carried out subsequent step; If not, then enter in the step 522, calculate the value of Tds.

Step 524 judges 2. whether Timer passed through 1 minute.

If not, then return step 520, rejudge compressor and whether be in closed condition and carry out subsequent step; If then enter step 526.

Step 526, judge | ℃ set up Tds-Tdo| 〉=5?

If be false, then return step 514, again 2. Timer is carried out zero clearing and carry out subsequent step; If set up, then enter step 528.

Does step 528 judge that Tds is greater than Tdo?

If greater than, then enter step 530, the Tdo value is revised assignment, i.e. Tdo=Tdo+5, and execution subsequent step; If be not more than, then enter step 532, the Tdo value is revised assignment, i.e. Tdo=Tdo-5.

Step 530 or step 532 processing are all returned step 514 after finishing, and again 2. Timer are carried out zero clearing and carry out subsequent step.

What need supplementary notes is:

1.|Tds during (the current calculated value of target temperature)-Tdo|＜5 ℃, the value of Tdo does not change;

2.|Tds-Tdo| in the time of 〉=5 ℃, the change of Tdo is a unit with 5 ℃;

3.Tdo higher limit be 110 ℃, lower limit is 65 ℃;

4.Tdo change cycle minimum be 1 minute.

The setting process figure of target temperature value Tdo when Fig. 6 illustrates the present invention and heats.As shown in Figure 6, step 600, the assignment procedure of target temperature value Tdo begins when heating.

Then enter in the step 602, judge whether Y55C is in opening, if not, return this step before, reenter step 602 and judge; If opening then enters step 604.

Step 604 is set Tdo=100 ℃ of initial target temperature value.

Step 606,1. Timer carries out zero clearing.

Step 608,1. Timer starts.

Step 610, judgement environment temperature Ta 〉=0 ℃?

If not, enter step 620 and carry out subsequent step; If, then enter step 612, judge whether Y55C is in closed condition.

If not, return this step before, reenter step 602 and judge; If closed condition then enters step 614.

Does step 614 judge 1. whether Timer passed through 2 minutes?

If not, then return step 612, rejudge Y55C and whether be in closed condition and carry out subsequent step; If then enter step 616.

Does from another road, step 620 judge that Y55C is in closed condition simultaneously?

If, then return step 620, rejudge Y55C and whether be in closed condition and carry out subsequent step; If not, then enter step 622, judge 1. whether Timer passed through 5 minutes.If then also enter step 616.

Step 616,2. Timer carries out zero clearing.

Step 618,2. Timer starts.

Does step 626 judge that Y55C is in closed condition?

If, then return step 626, rejudge Y55C and whether be in closed condition and carry out subsequent step; If not, then enter step 628, judge whether in defrosting is prepared?

Step 628 if judge it is in defrosting is prepared, then enters step 630, judge whether the defrosting beginning?

Step 630 if judge it is the defrosting beginning, then enters in the step 624, judge whether that defrosting finishes?

Step 624 if judge it is not that defrosting finishes, is then returned step 624, rejudge and judge whether that defrosting finishes?

Step 624 finishes if judge defrosting, then returns step 602, judges whether Y55C is in opening and carries out subsequent step.

Step 630 if judge it is not the defrosting beginning, then enters in the step 632, judge whether in defrosting is prepared?

Step 632 if judge it is in defrosting is prepared, is then returned step 630, rejudge and judge whether the defrosting beginning?

Step 632 if judge it is not in defrosting is prepared, then enters step 634.

Step 634,2. Timer carries out zero clearing.

Step 636,2. Timer starts.

After the step 636,, then enter step 638 if perhaps judge it is not in defrosting is prepared in step 628.

Step 638 begins to calculate Tds.

Step 640, did 2. Timer pass through 1 minute?

If not, then return step 626, rejudge Y55C and whether be in closed condition and carry out subsequent step; If, then enter in the step 642, judge | ℃ set up Tds-Tdo| 〉=5?

If be false, then return step 616, again 2. Timer is carried out zero clearing and carry out subsequent step; If set up, then enter step 644.

Does step 644 judge that Tds is greater than Tdo?

If greater than, then enter step 646, the Tdo value is revised assignment, i.e. Tdo=Tdo+5, and execution subsequent step; If be not more than, then enter step 648, the Tdo value is revised assignment, i.e. Tdo=Tdo-5.

Step 646 or step 648 processing are all returned step 616 after finishing, and again 2. Timer are carried out zero clearing and carry out subsequent step.

What need supplementary notes is:

1) | during Tds (the current calculated value of target temperature)-Tdo|＜5 ℃, the value of Tdo does not change;

2) | during Tds-Tdo| 〉=5 ℃, the change of Tdo is a unit with 5 ℃;

3) higher limit of Tdo is 110 ℃, and lower limit is 65 ℃;

4) the change cycle minimum of Tdo is 1 minute.

Seven, the calculating of the electronic expansion valve opening in the fuzzy control (EVO)

Expansion valve opening calculates according to following formula:

EVO(n)＝EVO(n-1)+ΔEVO

The aperture table of Δ EVO during R410A (outside unit capacity: 25,35,50,72,100,125) can find according to following table:

Table-13

In the table, Q: Δ Td (n)-Δ Td (n-1)

Q=0 when the 1st time Δ Td (n) calculated after off-premises station started;

ΔTd(n)：Td-Tdo

Δ Td (n-1): the Δ Td (n) in a last moment

Td: the temperature on the compressor

Tdo: the target temperature on the compressor

1)-20≤ΔEVO≤20pls；

2) computing cycle of expansion valve opening is 60 seconds;

3) the output cycle of expansion valve opening is according to following calculating:

Refrigeration:

The output cycle R410A condition of expansion valve

60 seconds Tl 〉=3 ℃

120 seconds Tl＜3 ℃

Table-14

Te: refrigeration evaporator temperature (indoor coil pipe);

The return difference of control is 2 ℃.

Heat:

The output cycle R410A condition of expansion valve

60 seconds Te 〉=-6 ℃

120 seconds-6＞Te 〉=-15 ℃

180 seconds-15 ℃＞Te

Table-15

Te: heat evaporating temperature (outdoor coil pipe used temperature);

The return difference of control is 2 ℃.

When 4) value of Td＜100 ℃ and Tc≤55 ℃ and Te 〉=3 ℃ (when only heating) and Δ EVO was a shaded side on the aperture table, the output cycle of expansion valve was 120 seconds.

Tc: indoor coil pipe.

5), the value on the aperture table of Δ EVO is carried out following correction (being rounded up to integer) according to present expansion valve opening (EVO):

Present expansion valve opening

Expansion valve opening variable quantity (Δ EVO)

(EVO)

EVO＞240 ΔEVO＝ΔEVO×1.5

240≥EVO＞140 ΔEVO

140≥EVO ΔEVO＝ΔEVO×0.7

Table-16

6) lower limit of expansion valve opening is in the compressor operating:

Capacity 25 35 50 72 100 125

Freeze 140 140 140 130 140 140

Heat 120 120 120 105 120 120

Table-17

More than specific descriptions of the present invention are intended to illustrate the implementation of specific embodiments can not be interpreted as it is limitation of the present invention.Those of ordinary skills can make various variants on the basis of the embodiment that describes in detail under instruction of the present invention, these variants all should be included within the design of the present invention.The present invention's scope required for protection is only limited by described claims.

Claims (10)

1. an air-conditioning fuzzy control method comprises the steps:

Step 1: gather the exhaust temperature signal Td of air conditioner circulating system in real time, detect whether there is fluctuation;

Step 2: when detecting the fluctuation of air conditioner circulating system, calculate the amplitude of variation Δ A of delivery temperature Td, and the Td0 value and the initial setting temperature T d that calculate historical record _IntDifference e;

Step 3: e and Δ A are carried out Fuzzy processing, and adjust the control law of air conditioner circulating system;

Step 4:, adjust the aperture of air conditioner electronic expansion valve in real time according to the control law of air conditioner circulating system.

2. air-conditioning fuzzy control method as claimed in claim 1 is characterized in that:

In the described step 1, detect when fluctuation does not take place, the control law of air conditioner circulating system remains unchanged, and keeps the aperture of air conditioner electronic expansion valve constant.

3. air-conditioning fuzzy control method as claimed in claim 1 is characterized in that:

Adjusting the control law of air conditioner circulating system in the described step 3 realizes by adjusting the control law table.

4. air-conditioning fuzzy control method as claimed in claim 3 is characterized in that:

Described adjustment control law table adopts the mode that refreshes Td0.

5. as each described air-conditioning fuzzy control method of claim 1 to 4, it is characterized in that:

The aperture of described real-time adjustment air conditioner electronic expansion valve adopts the mode of obfuscation control:

{plus，reverse，minus，motionless}

Wherein, plus represents Td0+n degree (n is the positive integer of 0-20), and reverse represents the Td0-6n degree, and minus represents the Td0-n degree, and the motionless representation parameter keeps.

6. the Fuzzy control system of an air-conditioning comprises:

Surge detection module (500), gather the exhaust temperature signal Td of air conditioner circulating system in real time, detect and whether have fluctuation, when having fluctuation, the exhaust temperature signal Td value of gathering is sent to fuzzy controller (100), and, when not having fluctuation, the exhaust temperature signal Td value of gathering is fed back to pid control module (200);

Fuzzy controller (100) is to the amplitude of variation Δ A of delivery temperature Td and the Td0 value and the initial setting temperature T d of historical record _IntDifference e carry out Fuzzy processing, and carry out fuzzy reasoning and reverse gelatinization according to the control law table and handle, export new Td0 to pid control module (200);

Pid control module (200) is controlled according to the Td0 value of fuzzy controller (100) generation or the Td value of surge detection module (500) feedback, generates the aperture deviate of corresponding electric expansion valve;

Limit value adjusting module (300), the aperture deviate of the electric expansion valve that generates according to pid control module (200) and the actual opening value of electric expansion valve carry out the limit value adjustment to the aperture of the electric expansion valve after calculating and handle; And

Valve control module (400) through adjusting the aperture of the electric expansion valve of handling, is carried out working control to the aperture of electric expansion valve according to limit value adjusting module (300).

7. as the Fuzzy control system of air-conditioning as described in the claim 6, it is characterized in that:

The limited field of described restriction adjusting module is 70-480 (pls).

8. as the Fuzzy control system of air-conditioning as described in the claim 7, it is characterized in that:

The control cycle of described pid control module is 1 minute; And/or

The adjustment cycle of described fuzzy controller is 5 minutes.

9. as the Fuzzy control system of claim 6 to 8 air-conditioning as described in each, it is characterized in that the aperture of described electric expansion valve adopts the mode of obfuscation control:

{plus，reverse，minus，motionless}

Wherein, plus represents Td0+n degree (n is the positive integer of 0-20), and reverse represents the Td0-6n degree, and minus represents the Td0-n degree, and the motionless representation parameter keeps.

10. as the Fuzzy control system of air-conditioning as described in the claim 9, it is characterized in that described fuzzy controller comprises:

Integrator (101) carries out Integral Processing to the exhaust temperature signal Td value that surge detection module (500) is gathered, and obtains the amplitude of variation Δ A of delivery temperature Td, sends obfuscation module (102) then to;

Obfuscation module (102), the amplitude of variation Δ A of the delivery temperature Td that integrated integral device (101) obtains and the Td0 value of historical record and initial setting temperature T d _IntDifference e, carry out obfuscation and be expressed as: { e _-5, e _-4, e _-3, e _-2, e _-1, e ₀, e ₁, e ₂, e ₃, e ₄, e ₅, { WAVE} also, has been divided into 11 shelves with the Td0 deviation for FLAT, TRANSITION, and the change of amplitude is divided into 3 grades, and the expression implication is respectively that FLAT represents ripple disable, and TRANSITION is a transition state, and WAVE is for there being fluctuation;

Control law table (105) sends predefined control law to fuzzy reasoning module (103);

Fuzzy reasoning module (103), the Comprehensive Control rule is carried out reasoning under the hazy condition to the Δ A of the fuzzy expression of obfuscation module (102) and e, then the result of reasoning is sent to reverse gelatinization module (104); And

Reverse gelatinization module (104) is carried out the reverse gelatinization to the result of obfuscation reasoning and is handled, to generate new Td0 value.

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