CN104729017A - Constant-air-flow control method and device for air conditioner - Google Patents

Constant-air-flow control method and device for air conditioner Download PDF

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Publication number
CN104729017A
CN104729017A CN201510114444.2A CN201510114444A CN104729017A CN 104729017 A CN104729017 A CN 104729017A CN 201510114444 A CN201510114444 A CN 201510114444A CN 104729017 A CN104729017 A CN 104729017A
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China
Prior art keywords
blower fan
current
air
static pressure
rotating speed
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Granted
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CN201510114444.2A
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Chinese (zh)
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CN104729017B (en
Inventor
刘莉华
上野佐千夫
梁锐
江燕京
洪伟鸿
李松
练海芳
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Midea Group Co Ltd
Guangdong Midea HVAC Equipment Co Ltd
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Midea Group Co Ltd
Guangdong Midea HVAC Equipment Co Ltd
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Priority to CN201510114444.2A priority Critical patent/CN104729017B/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The invention discloses a constant-air-flow control method for an air conditioner. The method includes the following steps that in a current control period of a fan of the air conditioner, the current rotating speed and the current operating current of the fan are acquired; according to the current rotating speed and the current operating current of the fan, the current electromagnetic torque, the current actual static pressure and the current actual air quantity of the fan are calculated; whether the current actual air quantity of the fan is equal to a preset air quantity is judged; if not, according to the current actual air quantity and the current actual static pressure of the fan, the air quantity impedance is calculated, and according to the air quantity impedance and the preset air quantity, the static pressure, the rotating speed and the electromagnetic torque of the fan in a next control period are calculated; according to the rotating speed and the electromagnetic torque of the fan in the next control period, air quantity control is performed on the fan. By means of the constant-air-flow control method, constant-air-flow control over the air conditioner can be achieved, the control precision is high, and the response speed is high. The invention further discloses a constant-air-flow control device for the air conditioner.

Description

The constant air capacity control of air-conditioner, control device
Technical field
The present invention relates to air-conditioner technical field, particularly a kind of constant air capacity control of air-conditioner and a kind of permanent wind amount control device of air-conditioner.
Background technology
In air-conditioner system, the air quantity of blower fan is the key factor affecting air-conditioner system cooling or heating effect.In the actual installation of air-conditioner with in using, by the restriction of the conditions such as installation site, same blower fan has different air channels, cause duct resistance different, or there is clogging in air channel, when adopting conventional fan control mode as constant speed control, the phenomenon that air quantity under different fan static pressure can be caused to reduce occurs, thus affects refrigeration or the heating effect of air-conditioner system.Therefore, permanent wind amount control technology is one of development trend of air-conditioner control technology.
At present, permanent wind amount control program comprises:
(1) increase associated arguments sensor, according to the actual parameter size that detects and the direct or indirect relation between this parameter and air quantity, control executing agency's action thus realize permanent Boiler pressure control.
(2) detect the electric current of motor, power and rotating speed, according to electric current, power, relation between rotating speed and default air quantity, increase or reduce rotating speed, thus reaching permanent Boiler pressure control.
(3) functional relation of method establishment air quantity by experiment and motor torque, motor speed, wherein, functional relation is the piecewise function relevant to motor speed or motor torque.
But in above-mentioned permanent wind amount control program, or cost is higher, or control accuracy is not high, and response speed is slow, and control system cannot know static pressure information accurately, therefore, need to improve the permanent Boiler pressure control of air-conditioner.
Summary of the invention
Object of the present invention is intended at least solve one of above-mentioned technological deficiency.
For this reason, one object of the present invention is the constant air capacity control proposing a kind of air-conditioner, and can realize the permanent Boiler pressure control of air-conditioner, control accuracy is high, fast response time.
Another object of the present invention is the permanent wind amount control device proposing a kind of air-conditioner.
For achieving the above object, the constant air capacity control of the air-conditioner that one aspect of the present invention embodiment proposes, comprise the following steps: in the current control period of the blower fan of described air-conditioner, obtain the current rotating speed of described blower fan and the current running current of described blower fan, and calculate the current electromagnetic torque of described blower fan according to the current running current of described blower fan; According to the current rotating speed of described blower fan and the current actual static pressure of the current electromagnetic torque calculation of described blower fan, and calculate the current actual air volume of described blower fan according to the current rotating speed of described current actual static pressure and described blower fan; Judge that whether the current actual air volume of described blower fan is equal with default air quantity; If not, then according to current actual air volume and the impedance of described current actual static pressure calculating air quantity of described blower fan, and according to the static pressure of described air quantity impedance and described default next control cycle of Wind Coverage Calculation, and calculate the rotating speed of blower fan of next control cycle described according to the static pressure of next control cycle described, and calculate the electromagnetic torque of the blower fan of next control cycle described according to the rotating speed of the blower fan of next control cycle described and the static pressure of next control cycle described; Electromagnetic torque according to the rotating speed of the blower fan of next control cycle described and the blower fan of next control cycle described carries out Boiler pressure control to described blower fan.
According to the constant air capacity control of the air-conditioner of the embodiment of the present invention, in the current control period of the blower fan of air-conditioner, first the current rotating speed of blower fan and the current running current of blower fan is obtained, and the current electromagnetic torque of blower fan is calculated according to the current running current of blower fan, and according to the current rotating speed of blower fan and the current actual static pressure of the current electromagnetic torque calculation of blower fan, and the current actual air volume of blower fan is calculated according to the current rotating speed of current actual static pressure and blower fan, then judge that whether the current actual air volume of blower fan is equal with default air quantity, if not, then according to current actual air volume and the impedance of current actual static pressure calculating air quantity of blower fan, and according to the static pressure of air quantity impedance and default next control cycle of Wind Coverage Calculation, and the rotating speed of blower fan of next control cycle is calculated according to the static pressure of next control cycle, and the electromagnetic torque of the blower fan of next control cycle is calculated according to the rotating speed of the blower fan of next control cycle and the static pressure of next control cycle, finally according to the electromagnetic torque of the rotating speed of the blower fan of next control cycle and the blower fan of next control cycle, Boiler pressure control is carried out to blower fan, thus realize the permanent Boiler pressure control of air-conditioner, its fast convergence rate, response time is little, control accuracy is high, effectively can meet the requirement of permanent Boiler pressure control.
According to one embodiment of present invention, current actual static pressure according to following formulae discovery:
P s 0 = T m 0 - ( ϵ × N 0 2 + ζ × N 0 ) γ × N 0 + δ
Wherein, P s0for described current actual static pressure, T m0for the current electromagnetic torque of described blower fan, N 0for the current rotating speed of described blower fan, ε, ζ, γ and δ are the system characteristic parameters of described blower fan.
According to one embodiment of present invention, the current actual air volume of blower fan according to following formulae discovery:
Q 0 = ( κ × P s 0 ) × N 0 2 + ( λ × P s 0 + v ) × N 0 + ( μ × P s 0 + ξ )
Wherein, Q 0for the current actual air volume of described blower fan, P s0for described current actual static pressure, N 0for the current rotating speed of described blower fan, κ, λ, ν, μ and ξ are the system characteristic parameters of described blower fan.
According to one embodiment of present invention, air quantity impedance according to following formulae discovery:
K r = P s 0 Q 0
Wherein, K rfor described air quantity impedance, Q 0for the current actual air volume of described blower fan, P s0for described current actual static pressure.
According to one embodiment of present invention, vector controlled is carried out to make the d shaft current of described blower fan for 0 to described blower fan, then the current electromagnetic torque of blower fan according to following formulae discovery:
T m0＝K t×i q
Wherein, T m0for the current electromagnetic torque of described blower fan, K tfor torque constant, and K e=100 × π/9 × K t, K efor the induced voltage constant of described blower fan, i qfor the q shaft current of described blower fan, and i q=i m0, i m0for the current running current of described blower fan.
For achieving the above object, the permanent wind amount control device of the air-conditioner that the present invention's another aspect embodiment proposes, comprise: acquisition module, described acquisition module is used in the current control period of the blower fan of described air-conditioner, obtain the current rotating speed of described blower fan and the current running current of described blower fan, computing module, described computing module is used for the current electromagnetic torque calculating described blower fan according to the current running current of described blower fan, and according to the current rotating speed of described blower fan and the current actual static pressure of the current electromagnetic torque calculation of described blower fan, and calculate the current actual air volume of described blower fan according to the current rotating speed of described current actual static pressure and described blower fan, judge module, whether described judge module is equal with default air quantity for judging the current actual air volume of described blower fan, and when the current actual air volume and described default air quantity that judge described blower fan are unequal, described computing module is also according to current actual air volume and the impedance of described current actual static pressure calculating air quantity of described blower fan, and according to the static pressure of described air quantity impedance and described default next control cycle of Wind Coverage Calculation, and the rotating speed of blower fan of next control cycle described is calculated according to the static pressure of next control cycle described, and the electromagnetic torque of the blower fan of next control cycle described is calculated according to the rotating speed of the blower fan of next control cycle described and the static pressure of next control cycle described, control module, described control module is used for carrying out Boiler pressure control according to the electromagnetic torque of the rotating speed of the blower fan of next control cycle described and the blower fan of next control cycle described to described blower fan.
According to the permanent wind amount control device of the air-conditioner of the embodiment of the present invention, acquisition module obtains the current rotating speed of blower fan and the current running current of blower fan in the current control period of the blower fan of air-conditioner, computing module calculates the current electromagnetic torque of blower fan according to the current running current of blower fan, and according to the current rotating speed of blower fan and the current actual static pressure of the current electromagnetic torque calculation of blower fan, and the current actual air volume of blower fan is calculated according to the current rotating speed of current actual static pressure and blower fan, judge module judges that whether the current actual air volume of blower fan is equal with default air quantity, and when the current actual air volume and default air quantity that judge blower fan are unequal, computing module is also according to current actual air volume and the impedance of current actual static pressure calculating air quantity of blower fan, and according to the static pressure of air quantity impedance and default next control cycle of Wind Coverage Calculation, and the rotating speed of blower fan of next control cycle is calculated according to the static pressure of next control cycle, and the electromagnetic torque of the blower fan of next control cycle is calculated according to the rotating speed of the blower fan of next control cycle and the static pressure of next control cycle, control module carries out Boiler pressure control according to the electromagnetic torque of the rotating speed of the blower fan of next control cycle and the blower fan of next control cycle to blower fan, thus realize the permanent Boiler pressure control of air-conditioner, its fast convergence rate, response time is little, control accuracy is high, effectively can meet the requirement of permanent Boiler pressure control.
According to one embodiment of present invention, described computing module current actual static pressure according to following formulae discovery:
P s 0 = T m 0 - ( ϵ × N 0 2 + ζ × N 0 ) γ × N 0 + δ
Wherein, P s0for described current actual static pressure, T m0for the current electromagnetic torque of described blower fan, N 0for the current rotating speed of described blower fan, ε, ζ, γ and δ are the system characteristic parameters of described blower fan.
According to one embodiment of present invention, the current actual air volume of described computing module blower fan according to following formulae discovery:
Q 0 = ( κ × P s 0 ) × N 0 2 + ( λ × P s 0 + v ) × N 0 + ( μ × P s 0 + ξ )
Wherein, Q 0for the current actual air volume of described blower fan, P s0for described current actual static pressure, N 0for the current rotating speed of described blower fan, κ, λ, ν, μ and ξ are the system characteristic parameters of described blower fan.
According to one embodiment of present invention, described computing module air quantity impedance according to following formulae discovery:
K r = P s 0 Q 0
Wherein, K rfor described air quantity impedance, Q 0for the current actual air volume of described blower fan, P s0for described current actual static pressure.
According to one embodiment of present invention, described control module carries out vector controlled to make the d shaft current of described blower fan for 0 to described blower fan, the current electromagnetic torque of described computing module blower fan according to following formulae discovery:
T m0＝K t×i q
Wherein, T m0for the current electromagnetic torque of described blower fan, K tfor torque constant, and K e=100 × π/9 × K t, K efor the induced voltage constant of described blower fan, i qfor the q shaft current of described blower fan, and i q=i m0, i m0for the current running current of described blower fan.
The aspect that the present invention adds and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
The present invention above-mentioned and/or additional aspect and advantage will become obvious and easy understand from the following description of the accompanying drawings of embodiments, wherein:
Fig. 1 is the flow chart of the constant air capacity control of air-conditioner according to the embodiment of the present invention; And
Fig. 2 is the block diagram of the permanent wind amount control device of air-conditioner according to the embodiment of the present invention.
Detailed description of the invention
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
Disclosing hereafter provides many different embodiments or example is used for realizing different structure of the present invention.Of the present invention open in order to simplify, hereinafter the parts of specific examples and setting are described.Certainly, they are only example, and object does not lie in restriction the present invention.In addition, the present invention can in different example repeat reference numerals and/or letter.This repetition is to simplify and clearly object, itself does not indicate the relation between discussed various embodiment and/or setting.In addition, the various specific technique that the invention provides and the example of material, but those of ordinary skill in the art can recognize the property of can be applicable to of other techniques and/or the use of other materials.In addition, fisrt feature described below second feature it " on " structure can comprise the embodiment that the first and second features are formed as directly contact, also can comprise other feature and be formed in embodiment between the first and second features, such first and second features may not be direct contacts.
In describing the invention, it should be noted that, unless otherwise prescribed and limit, term " installation ", " being connected ", " connection " should be interpreted broadly, such as, can be mechanical connection or electrical connection, also can be the connection of two element internals, can be directly be connected, also indirectly can be connected by intermediary, for the ordinary skill in the art, the concrete meaning of above-mentioned term can be understood as the case may be.
The constant air capacity control of air-conditioner and the permanent wind amount control device of air-conditioner that propose according to the embodiment of the present invention are described with reference to the accompanying drawings.
Fig. 1 is the flow chart of the constant air capacity control of air-conditioner according to the embodiment of the present invention.As shown in Figure 1, the constant air capacity control of this air-conditioner comprises the following steps:
S 1, in the current control period of the blower fan of air-conditioner, obtains the current rotating speed of blower fan and the current running current of blower fan, and calculates the current electromagnetic torque of blower fan according to the current running current of blower fan.
According to one embodiment of present invention, vector controlled is carried out to make the d shaft current of blower fan for 0 to blower fan, then calculates the current electromagnetic torque of blower fan according to following formula (1):
T m0＝K t×i q(1)
Wherein, T m0for the current electromagnetic torque of blower fan, K tfor torque constant, and K e=100 × π/9 × K t, K efor the induced voltage constant of blower fan, i qfor the q shaft current of blower fan, and i q=i m0, i m0for the current running current of blower fan.
Specifically, d shaft current is adopted to be that the control mode of 0 i.e. Id=0 carries out vector controlled to blower fan, because d shaft current is 0 in control procedure, therefore, the running current of blower fan is the q shaft current of blower fan, and now the electromagnetic torque of blower fan meets following formula (2):
T m＝3×Φ m×P o×i q(2)
Wherein, T mfor the electromagnetic torque of blower fan, Φ mfor the total magnetic flux of blower fan, P ofor number of pole-pairs.
Make torque constant K t=3 × Φ m× P o, then the electromagnetic torque of blower fan meets following formula (3):
T m＝K t×i q(3)
In addition, due to torque constant K twith the induced voltage constant K of blower fan ebetween meet following formula (4):
K e＝100×π/9×K t(4)
Therefore, at the induced voltage constant K of blower fan ewhen known, and when adopting the control mode of Id=0 to carry out vector controlled to blower fan, torque constant K can be calculated by above-mentioned formula (4) t, thus the electromagnetic torque T of blower fan can be calculated according to above-mentioned formula (3) m.
S2, according to the current rotating speed of blower fan and the current actual static pressure of the current electromagnetic torque calculation of blower fan, and calculates the current actual air volume of blower fan according to the current rotating speed of current actual static pressure and blower fan.
According to one embodiment of present invention, current actual static pressure is calculated according to following formula (5):
P s 0 = T m 0 - ( ϵ × N 0 2 + ζ × N 0 ) γ × N 0 + δ - - - ( 5 )
Wherein, P s0for current actual static pressure, N 0for the current rotating speed of blower fan, ε, ζ, γ and δ are the system characteristic parameters of blower fan, and these parameters are known.
According to one embodiment of present invention, the current actual air volume of blower fan is calculated according to following formula (6):
Q 0 = ( κ × P s 0 ) × N 0 2 + ( λ × P s 0 + v ) × N 0 + ( μ × P s 0 + ξ ) - - - ( 6 )
Wherein, Q 0for the current actual air volume of blower fan, κ, λ, ν, μ and ξ are the system characteristic parameters of blower fan, and these parameters are known.
Specifically, in an embodiment of the present invention, the functional relation between the rotating speed of the actual air volume of blower fan, actual static pressure and blower fan of method establishment by experiment, represents with following formula (7):
Q＝(κ×P s)×N 2+(λ×P s+ν)×N+(μ×P s+ξ) (7)
Wherein, Q is the actual air volume of blower fan, P sfor actual static pressure, N is the rotating speed of blower fan.
Above-mentioned formula (7) is carried out distortion and can obtain following formula (8):
(κ×P s)×N 2+(λ×P s+ν)×N+(μ×P s+ξ-Q)＝0 (8)
Analyze known to above-mentioned formula (8), at actual air volume Q and the actual static pressure P of blower fan swhen known, above-mentioned formula (8) is the quadratic equation with one unknown of the rotating speed N about blower fan, and therefore, the rotating speed N of blower fan can be obtained by following formula (9):
N = - ( λ × P s + v ) + ( λ × P s + v ) 2 - 4 × ( κ × P s ) × ( μ × P s + ξ - Q ) 2 × ( κ × P s ) - - - ( 9 )
In addition, method by experiment also establishes the functional relation between the rotating speed of the electromagnetic torque of blower fan, actual static pressure and blower fan, represents with following formula (10):
T m＝ε×N 2+(γ×P s+ζ)×N+(δ×P s) (10)
Be understandable that, at the electromagnetic torque T of blower fan mwhen known with the rotating speed N of blower fan, actual static pressure P can be obtained by above-mentioned formula (10) s.
S3, judges that whether the current actual air volume of blower fan is equal with default air quantity.
S4, if not, then according to current actual air volume and the impedance of current actual static pressure calculating air quantity of blower fan, and according to the static pressure of air quantity impedance and default next control cycle of Wind Coverage Calculation, and calculate the rotating speed of blower fan of next control cycle according to the static pressure of next control cycle, and calculate the electromagnetic torque of the blower fan of next control cycle according to the rotating speed of the blower fan of next control cycle and the static pressure of next control cycle.
According to one embodiment of present invention, air quantity impedance is calculated according to following formula (11):
K r = P s 0 Q 0 - - - ( 11 )
Wherein, K rfor air quantity impedance.
Specifically, blower fan can produce static pressure and dynamic pressure in the process run, and static pressure changes along with the change of the air quantity of blower fan, therefore, can consider to set up the relation between static pressure and the air quantity of blower fan from the angle of electric circuit.
Voltage V can be made to be actual static pressure P swith actual dynamic pressure P dsum, i.e. total head P t, luring and opening voltage E is actual dynamic pressure P d, electric current I is the actual air volume Q of blower fan, in addition, introduces air quantity impedance K rdefinition and make resistance R be air quantity impedance K r, then can obtain following formula (12) according to electric circuit principle V=E+R × I:
P s = K r × Q P t = P d + P s = P d + K r × Q - - - ( 12 )
Actual static pressure P can be obtained by above-mentioned formula (12) swith air quantity impedance K rbetween relation.
S5, the electromagnetic torque according to the rotating speed of the blower fan of next control cycle and the blower fan of next control cycle carries out Boiler pressure control to blower fan.
According to a concrete example of the present invention, converter plant receives the default air quantity Q of the blower fan that host computer sends ref, be 0 and default air quantity Q according to actual static pressure refcalculate the initial speed of blower fan, blower fan runs, in the running of blower fan, with time t for the cycle carries out permanent Boiler pressure control to blower fan according to the initial speed calculated.
Specifically, in the current control period of blower fan, first obtain the current rotating speed N of blower fan 0with the current running current of blower fan and the q shaft current i of blower fan q, by the q shaft current i of the blower fan of acquisition qbring the current electromagnetic torque T that above-mentioned formula (1) calculates blower fan into m0.Then by the current rotating speed N of blower fan 0with the current electromagnetic torque T of blower fan m0bring above-mentioned formula (5) into and calculate current actual static pressure P s0, and the current actual air volume Q of blower fan is calculated according to above-mentioned formula (6) 0.Then by the current actual air volume Q of the blower fan of calculating 0with the default air quantity Q of blower fan refcompare, if the current actual air volume Q of blower fan 0with the default air quantity Q of blower fan refequal or in error in very little scope, then do not need to revise the rotating speed of blower fan and the electromagnetic torque of blower fan; If the current actual air volume Q of blower fan 0with the default air quantity Q of blower fan refunequal or error is larger time, then need to revise the rotating speed of blower fan and the electromagnetic torque of blower fan.The current actual static pressure P now will calculated s0with the current actual air volume Q of blower fan 0bring above-mentioned formula (11) into and calculate air quantity impedance K r, then will calculate air quantity impedance K rwith the default air quantity Q of blower fan refbring the static pressure P that above-mentioned formula (11) calculates next control cycle into s1, and the rotating speed N of the blower fan of next control cycle is calculated respectively according to above-mentioned formula (9) and above-mentioned formula (10) 1with the electromagnetic torque T of the blower fan of next control cycle m1.Finally according to the rotating speed N of the blower fan of next control cycle 1with the electromagnetic torque T of the blower fan of next control cycle m1blower fan is controlled.
To sum up, in an embodiment of the present invention, utilize air quantity impedance to carry out permanent Boiler pressure control to blower fan, can be carried out the quick calculating of actual air volume and actual static pressure by air quantity impedance, its permanent wind amount control convergence speed is fast, makes blower fan can enter stable state fast.
In sum, according to the constant air capacity control of the air-conditioner of the embodiment of the present invention, in the current control period of the blower fan of air-conditioner, first the current rotating speed of blower fan and the current running current of blower fan is obtained, and the current electromagnetic torque of blower fan is calculated according to the current running current of blower fan, and according to the current rotating speed of blower fan and the current actual static pressure of the current electromagnetic torque calculation of blower fan, and the current actual air volume of blower fan is calculated according to the current rotating speed of current actual static pressure and blower fan, then judge that whether the current actual air volume of blower fan is equal with default air quantity, if not, then according to current actual air volume and the impedance of current actual static pressure calculating air quantity of blower fan, and according to the static pressure of air quantity impedance and default next control cycle of Wind Coverage Calculation, and the rotating speed of blower fan of next control cycle is calculated according to the static pressure of next control cycle, and the electromagnetic torque of the blower fan of next control cycle is calculated according to the rotating speed of the blower fan of next control cycle and the static pressure of next control cycle, finally according to the electromagnetic torque of the rotating speed of the blower fan of next control cycle and the blower fan of next control cycle, Boiler pressure control is carried out to blower fan, thus realize the permanent Boiler pressure control of air-conditioner, its fast convergence rate, response time is little, control accuracy is high, effectively can meet the requirement of permanent Boiler pressure control.
Fig. 2 is the block diagram of the permanent wind amount control device of air-conditioner according to the embodiment of the present invention.As shown in Figure 2, the permanent wind amount control device of this air-conditioner comprises acquisition module 10, computing module 20, judge module 30 and control module 40.
Wherein, acquisition module 10 is for the current running current of the current rotating speed and blower fan that obtain blower fan in the current control period of the blower fan of air-conditioner.Computing module 20 is for calculating the current electromagnetic torque of blower fan according to the current running current of blower fan, and according to the current rotating speed of blower fan and the current actual static pressure of the current electromagnetic torque calculation of blower fan, and calculate the current actual air volume of blower fan according to the current rotating speed of current actual static pressure and blower fan.Whether judge module 30 is equal with default air quantity for judging the current actual air volume of blower fan, and when the current actual air volume and default air quantity that judge blower fan are unequal, computing module 20 is also according to current actual air volume and the impedance of current actual static pressure calculating air quantity of blower fan, and according to the static pressure of air quantity impedance and default next control cycle of Wind Coverage Calculation, and the rotating speed of blower fan of next control cycle is calculated according to the static pressure of next control cycle, and the electromagnetic torque of the blower fan of next control cycle is calculated according to the rotating speed of the blower fan of next control cycle and the static pressure of next control cycle.Control module 40 carries out Boiler pressure control for the electromagnetic torque of the rotating speed of the blower fan according to next control cycle and the blower fan of next control cycle to blower fan.
According to one embodiment of present invention, control module 40 pairs of blower fans carry out vector controlled to make the d shaft current of blower fan for 0, and computing module 20 calculates the current electromagnetic torque of blower fan according to above-mentioned formula (1).
Specifically, control module 40 adopts d shaft current to be that the control mode of 0 i.e. Id=0 carries out vector controlled to blower fan, because in control procedure, d shaft current is 0, therefore, the running current of blower fan is the q shaft current of blower fan, now the electromagnetic torque of blower fan meets above-mentioned formula (2), makes torque constant K t=3 × Φ m× P o, then the electromagnetic torque of blower fan meets above-mentioned formula (3), in addition, due to torque constant K twith the induced voltage constant K of blower fan ebetween meet above-mentioned formula (4), therefore, at the induced voltage constant K of blower fan ewhen known, and when adopting the control mode of Id=0 to carry out vector controlled to blower fan, torque constant K can be calculated by above-mentioned formula (4) t, thus the electromagnetic torque T of blower fan can be calculated according to above-mentioned formula (3) m.
According to one embodiment of present invention, computing module 20 calculates current actual static pressure according to above-mentioned formula (5).
According to one embodiment of present invention, computing module 20 calculates the current actual air volume of blower fan according to above-mentioned formula (6).
Specifically, the functional relation in an embodiment of the present invention between the method establishment by experiment rotating speed of the actual air volume of blower fan, actual static pressure and blower fan, as above-mentioned formula (7).Above-mentioned formula (7) is carried out distortion and can obtain above-mentioned formula (8), and analyze known to above-mentioned formula (8), at actual air volume Q and the actual static pressure P of blower fan swhen known, above-mentioned formula (8) is the quadratic equation with one unknown of the rotating speed N about blower fan, and therefore, the rotating speed N of blower fan can be obtained by above-mentioned formula (9).
In addition, method by experiment also establishes the functional relation between the rotating speed of the electromagnetic torque of blower fan, actual static pressure and blower fan, as above-mentioned formula (10).Be understandable that, at the electromagnetic torque T of blower fan mwhen known with the rotating speed N of blower fan, actual static pressure P can be obtained by above-mentioned formula (10) s.
According to one embodiment of present invention, computing module 20 calculates air quantity impedance according to above-mentioned formula (11).
Specifically, blower fan can produce static pressure and dynamic pressure in the process run, and static pressure changes along with the change of the air quantity of blower fan, therefore, can consider to set up the relation between static pressure and the air quantity of blower fan from the angle of electric circuit.
Voltage V can be made to be actual static pressure P swith actual dynamic pressure P dsum, i.e. total head P t, luring and opening voltage E is actual dynamic pressure P d, electric current I is the actual air volume Q of blower fan, in addition, introduces air quantity impedance K rdefinition and make resistance R be air quantity impedance K r, then can obtain above-mentioned formula (12) according to electric circuit principle, actual static pressure P can be obtained by above-mentioned formula (12) swith air quantity impedance K rbetween relation.
According to a concrete example of the present invention, converter plant receives the default air quantity Q of the blower fan that host computer sends ref, computing module 20 is 0 and default air quantity Q according to actual static pressure refcalculate the initial speed of blower fan, blower fan runs, in the running of blower fan, with time t for the cycle carries out permanent Boiler pressure control to blower fan according to the initial speed calculated.
Specifically, in the current control period of blower fan, first acquisition module 10 obtains the current rotating speed N of blower fan 0with the current running current of blower fan and the q shaft current i of blower fan q, computing module 20 is by the q shaft current i of the blower fan of acquisition qbring the current electromagnetic torque T that above-mentioned formula (1) calculates blower fan into m0.Then by the current rotating speed N of blower fan 0with the current electromagnetic torque T of blower fan m0bring above-mentioned formula (5) into and calculate current actual static pressure P s0, and the current actual air volume Q of blower fan is calculated according to above-mentioned formula (6) 0.Then judge module 30 is by the current actual air volume Q of the blower fan of calculating 0with the default air quantity Q of blower fan refcompare, if the current actual air volume Q of blower fan 0with the default air quantity Q of blower fan refequal or in error in very little scope, then do not need to revise the rotating speed of blower fan and the electromagnetic torque of blower fan; If the current actual air volume Q of blower fan 0with the default air quantity Q of blower fan refunequal or error is larger time, then need to revise the rotating speed of blower fan and the electromagnetic torque of blower fan.Now computing module 20 will calculate current actual static pressure P s0with the current actual air volume Q of blower fan 0bring above-mentioned formula (11) into and calculate air quantity impedance K r, then will calculate air quantity impedance K rwith the default air quantity Q of blower fan refbring the static pressure P that above-mentioned formula (11) calculates next control cycle into s1, and the rotating speed N of the blower fan of next control cycle is calculated respectively according to above-mentioned formula (9) and above-mentioned formula (10) 1with the electromagnetic torque T of the blower fan of next control cycle m1.Finally, control module 40 is according to the rotating speed N of the blower fan of next control cycle 1with the electromagnetic torque T of the blower fan of next control cycle m1blower fan is controlled.
According to the permanent wind amount control device of the air-conditioner of the embodiment of the present invention, acquisition module obtains the current rotating speed of blower fan and the current running current of blower fan in the current control period of the blower fan of air-conditioner, computing module calculates the current electromagnetic torque of blower fan according to the current running current of blower fan, and according to the current rotating speed of blower fan and the current actual static pressure of the current electromagnetic torque calculation of blower fan, and the current actual air volume of blower fan is calculated according to the current rotating speed of current actual static pressure and blower fan, judge module judges that whether the current actual air volume of blower fan is equal with default air quantity, and when the current actual air volume and default air quantity that judge blower fan are unequal, computing module is also according to current actual air volume and the impedance of current actual static pressure calculating air quantity of blower fan, and according to the static pressure of air quantity impedance and default next control cycle of Wind Coverage Calculation, and the rotating speed of blower fan of next control cycle is calculated according to the static pressure of next control cycle, and the electromagnetic torque of the blower fan of next control cycle is calculated according to the rotating speed of the blower fan of next control cycle and the static pressure of next control cycle, control module carries out Boiler pressure control according to the electromagnetic torque of the rotating speed of the blower fan of next control cycle and the blower fan of next control cycle to blower fan, thus realize the permanent Boiler pressure control of air-conditioner, its fast convergence rate, response time is little, control accuracy is high, effectively can meet the requirement of permanent Boiler pressure control.
Describe and can be understood in flow chart or in this any process otherwise described or method, represent and comprise one or more for realizing the module of the code of the executable instruction of the step of specific logical function or process, fragment or part, and the scope of the preferred embodiment of the present invention comprises other realization, wherein can not according to order that is shown or that discuss, comprise according to involved function by the mode while of basic or by contrary order, carry out n-back test, this should understand by embodiments of the invention person of ordinary skill in the field.
In flow charts represent or in this logic otherwise described and/or step, such as, the sequencing list of the executable instruction for realizing logic function can be considered to, may be embodied in any computer-readable medium, for instruction execution system, device or equipment (as computer based system, comprise the system of processor or other can from instruction execution system, device or equipment instruction fetch and perform the system of instruction) use, or to use in conjunction with these instruction execution systems, device or equipment.With regard to this description, " computer-readable medium " can be anyly can to comprise, store, communicate, propagate or transmission procedure for instruction execution system, device or equipment or the device that uses in conjunction with these instruction execution systems, device or equipment.The example more specifically (non-exhaustive list) of computer-readable medium comprises following: the electrical connection section (electronic installation) with one or more wiring, portable computer diskette box (magnetic device), random access memory (RAM), read-only storage (ROM), erasablely edit read-only storage (EPROM or flash memory), fiber device, and portable optic disk read-only storage (CDROM).In addition, computer-readable medium can be even paper or other suitable media that can print described program thereon, because can such as by carrying out optical scanner to paper or other media, then carry out editing, decipher or carry out process with other suitable methods if desired and electronically obtain described program, be then stored in computer storage.
Should be appreciated that each several part of the present invention can realize with hardware, software, firmware or their combination.In the above-described embodiment, multiple step or method can with to store in memory and the software performed by suitable instruction execution system or firmware realize.Such as, if realized with hardware, the same in another embodiment, can realize by any one in following technology well known in the art or their combination: the discrete logic with the logic gates for realizing logic function to data-signal, there is the special IC of suitable combinational logic gate circuit, programmable gate array (PGA), field programmable gate array (FPGA) etc.
Those skilled in the art are appreciated that realizing all or part of step that above-described embodiment method carries is that the hardware that can carry out instruction relevant by program completes, described program can be stored in a kind of computer-readable recording medium, this program perform time, step comprising embodiment of the method one or a combination set of.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing module, also can be that the independent physics of unit exists, also can be integrated in a module by two or more unit.Above-mentioned integrated module both can adopt the form of hardware to realize, and the form of software function module also can be adopted to realize.If described integrated module using the form of software function module realize and as independently production marketing or use time, also can be stored in a computer read/write memory medium.
The above-mentioned storage medium mentioned can be read-only storage, disk or CD etc.
In the description of this description, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and describe embodiments of the invention, for the ordinary skill in the art, be appreciated that and can carry out multiple change, amendment, replacement and modification to these embodiments without departing from the principles and spirit of the present invention, scope of the present invention is by claims and equivalency thereof.

Claims (10)

1. a constant air capacity control for air-conditioner, is characterized in that, comprises the following steps:
In the current control period of the blower fan of described air-conditioner, obtain the current rotating speed of described blower fan and the current running current of described blower fan, and calculate the current electromagnetic torque of described blower fan according to the current running current of described blower fan;
According to the current rotating speed of described blower fan and the current actual static pressure of the current electromagnetic torque calculation of described blower fan, and calculate the current actual air volume of described blower fan according to the current rotating speed of described current actual static pressure and described blower fan;
Judge that whether the current actual air volume of described blower fan is equal with default air quantity;
If not, then according to current actual air volume and the impedance of described current actual static pressure calculating air quantity of described blower fan, and according to the static pressure of described air quantity impedance and described default next control cycle of Wind Coverage Calculation, and calculate the rotating speed of blower fan of next control cycle described according to the static pressure of next control cycle described, and calculate the electromagnetic torque of the blower fan of next control cycle described according to the rotating speed of the blower fan of next control cycle described and the static pressure of next control cycle described;
Electromagnetic torque according to the rotating speed of the blower fan of next control cycle described and the blower fan of next control cycle described carries out Boiler pressure control to described blower fan.
2. the constant air capacity control of air-conditioner as claimed in claim 1, is characterized in that, current actual static pressure according to following formulae discovery:
P s 0 = T m 0 - ( ϵ × N 0 2 + ζ × N 0 ) γ × N 0 + δ
Wherein, P s0for described current actual static pressure, T m0for the current electromagnetic torque of described blower fan, N 0for the current rotating speed of described blower fan, ε, ζ, γ and δ are the system characteristic parameters of described blower fan.
3. the constant air capacity control of air-conditioner as claimed in claim 1, is characterized in that, the current actual air volume of blower fan according to following formulae discovery:
Q 0 = ( κ × P s 0 ) × N 0 2 + ( λ × P s 0 + v ) × N 0 + ( μ × P s 0 + ξ )
Wherein, Q 0for the current actual air volume of described blower fan, P s0for described current actual static pressure, N 0for the current rotating speed of described blower fan, κ, λ, ν, μ and ξ are the system characteristic parameters of described blower fan.
4. the constant air capacity control of air-conditioner as claimed in claim 1, is characterized in that, air quantity impedance according to following formulae discovery:
K r = P s 0 Q 0
Wherein, K rfor described air quantity impedance, Q 0for the current actual air volume of described blower fan, P s0for described current actual static pressure.
5. the constant air capacity control of the air-conditioner according to any one of claim 1-4, is characterized in that, carries out vector controlled to make the d shaft current of described blower fan for 0 to described blower fan, then the current electromagnetic torque of blower fan according to following formulae discovery:
T m0＝K t×i q
Wherein, T m0for the current electromagnetic torque of described blower fan, K tfor torque constant, and K e=100 × π/9 × K t, K efor the induced voltage constant of described blower fan, i qfor the q shaft current of described blower fan, and i q=i m0, i m0for the current running current of described blower fan.
6. a permanent wind amount control device for air-conditioner, is characterized in that, comprising:
Acquisition module, described acquisition module is used in the current control period of the blower fan of described air-conditioner, obtain the current rotating speed of described blower fan and the current running current of described blower fan;
Computing module, described computing module is used for the current electromagnetic torque calculating described blower fan according to the current running current of described blower fan, and according to the current rotating speed of described blower fan and the current actual static pressure of the current electromagnetic torque calculation of described blower fan, and calculate the current actual air volume of described blower fan according to the current rotating speed of described current actual static pressure and described blower fan;
Judge module, whether described judge module is equal with default air quantity for judging the current actual air volume of described blower fan, and when the current actual air volume and described default air quantity that judge described blower fan are unequal, described computing module is also according to current actual air volume and the impedance of described current actual static pressure calculating air quantity of described blower fan, and according to the static pressure of described air quantity impedance and described default next control cycle of Wind Coverage Calculation, and the rotating speed of blower fan of next control cycle described is calculated according to the static pressure of next control cycle described, and the electromagnetic torque of the blower fan of next control cycle described is calculated according to the rotating speed of the blower fan of next control cycle described and the static pressure of next control cycle described,
Control module, described control module is used for carrying out Boiler pressure control according to the electromagnetic torque of the rotating speed of the blower fan of next control cycle described and the blower fan of next control cycle described to described blower fan.
7. the permanent wind amount control device of air-conditioner as claimed in claim 6, it is characterized in that, described computing module is current actual static pressure according to following formulae discovery:
P s 0 = T m 0 - ( ϵ × N 0 2 + ζ × N 0 ) γ × N 0 + δ
Wherein, P s0for described current actual static pressure, T m0for the current electromagnetic torque of described blower fan, N 0for the current rotating speed of described blower fan, ε, ζ, γ and δ are the system characteristic parameters of described blower fan.
8. the permanent wind amount control device of air-conditioner as claimed in claim 6, is characterized in that, the current actual air volume of described computing module blower fan according to following formulae discovery:
Q 0 = ( κ × P s 0 ) × N 0 2 + ( λ × P s 0 + v ) × N 0 + ( μ × P s 0 + ξ )
Wherein, Q 0for the current actual air volume of described blower fan, P s0for described current actual static pressure, N 0for the current rotating speed of described blower fan, κ, λ, ν, μ and ξ are the system characteristic parameters of described blower fan.
9. the permanent wind amount control device of air-conditioner as claimed in claim 6, it is characterized in that, described computing module is air quantity impedance according to following formulae discovery:
K r = P s 0 Q 0
Wherein, K rfor described air quantity impedance, Q 0for the current actual air volume of described blower fan, P s0for described current actual static pressure.
10. the permanent wind amount control device of the air-conditioner according to any one of claim 6-9, it is characterized in that, described control module carries out vector controlled to make the d shaft current of described blower fan for 0 to described blower fan, the current electromagnetic torque of described computing module blower fan according to following formulae discovery:
T m0＝K t×i q
Wherein, T m0for the current electromagnetic torque of described blower fan, K tfor torque constant, and K e=100 × π/9 × K t, K efor the induced voltage constant of described blower fan, i qfor the q shaft current of described blower fan, and i q=i m0, i m0for the current running current of described blower fan.
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CN114810649A (en) * 2022-05-05 2022-07-29 雷勃电气(常州)有限公司 Constant air volume control method for backward tilting centrifugal fan
WO2024027319A1 (en) * 2022-07-30 2024-02-08 广东美的暖通设备有限公司 Air conditioner and constant air volume control method and apparatus therefor, and storage medium

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