CN113432246B - Air conditioner defrosting control method and device and air conditioner - Google Patents

Air conditioner defrosting control method and device and air conditioner Download PDF

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Publication number
CN113432246B
CN113432246B CN202110634567.4A CN202110634567A CN113432246B CN 113432246 B CN113432246 B CN 113432246B CN 202110634567 A CN202110634567 A CN 202110634567A CN 113432246 B CN113432246 B CN 113432246B
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air conditioner
control method
defrosting
compressor
motor
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CN113432246A (en
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薄传海
李发顺
陈红
邓哲
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Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
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Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
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    • 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
    • F24F11/41—Defrosting; Preventing freezing
    • F24F11/42—Defrosting; Preventing freezing of outdoor units
    • 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
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/022—Compressor control arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2103—Temperatures near a heat exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2115—Temperatures of a compressor or the drive means therefor
    • F25B2700/21152—Temperatures of a compressor or the drive means therefor at the discharge side of the compressor

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Thermal Sciences (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention provides an air conditioner defrosting control method and device and an air conditioner. The defrosting control method of the air conditioner comprises the following steps: controlling the air conditioner to enter a defrosting mode; obtaining the working current value I of the motor of the compressorSL(ii) a According to the formula ISLCalculating to obtain a current vector ISA compensation amount delta beta of an included angle beta with the q axis; altering said β according to said Δ β. The problem of current air conditioner lead to indoor travelling comfort low for long time because of the defrosting is solved.

Description

Air conditioner defrosting control method and device and air conditioner
Technical Field
The invention relates to the technical field of defrosting control of air conditioners, in particular to a defrosting control method of an air conditioner, a defrosting control device of the air conditioner and the air conditioner.
Background
When the existing air conditioner is operated in heating, if a heat exchanger of an outdoor unit is frosted, the ventilation performance of the outdoor unit is poor. As the frost thickness increases, the heat exchange efficiency of the outdoor unit is rapidly reduced, which causes a reduction in the heating capacity of the air conditioner and a deterioration in indoor comfort.
The defrosting mode commonly adopted at present is as follows: and controlling the air conditioner to refrigerate, absorbing heat from the indoor side and melting frosting of a heat exchanger of the outdoor unit. However, this has the following drawbacks: 1) the defrosting time is long due to limited absorbable heat, and the indoor heat exchanger is frosted at the later stage of defrosting, so that the absorbable heat is less, the defrosting time is further prolonged, and the indoor comfort is seriously affected; 2) if the frosting of the indoor heat exchanger is thick, after the defrosting is finished, when the air conditioner recovers to heat, the frosting of the indoor heat exchanger can be melted for a long time, so that the temperature of the indoor heat exchanger can be increased to the expected temperature after a long time, and the heating performance and the indoor comfort are influenced.
Disclosure of Invention
The invention solves the problem of low indoor comfort caused by long defrosting time of the existing air conditioner.
In order to solve the above problem, an embodiment of the present invention provides a defrosting control method for an air conditioner, including: controlling the air conditioner to enter a defrosting mode; obtaining the working current value I of the motor of the compressorSL(ii) a According to the formula ISLCalculating to obtain a current vector ISA compensation amount delta beta of an included angle beta with the q axis; altering said β according to said Δ β.
Compared with the prior art, the technical scheme has the following technical effects: the heating power of the compressor is improved by controlling the change of the included angle beta, so that the defrosting time is shortened, and the indoor comfort is improved.
In one embodiment of the present invention, the obtaining of the operating current value I of the motor of the compressorSL(ii) a The method comprises the following steps: acquiring demagnetization current I of the motor1And the maximum operating current I of the power module of the electrical machine2(ii) a According to the formula I1And said I2The smaller of which is given by said ISL。
In one embodiment of the invention, said I is according to1And said I2The smaller of which is given by said ISL(ii) a The method comprises the following steps: to obtain the said I1And said I2The smaller of these; taking x times of the smaller as the ISL(ii) a Wherein x is less than or equal to 0.8.
In one embodiment of the present invention, the obtaining of the operating current value I of the motor of the compressorSL(ii) a The method comprises the following steps: obtaining a system pressure value F of the air conditionerPress and pressThe discharge temperature T of the compressorRow boardOr temperature value T of outdoor unit heat exchangerChangeable pipe(ii) a At said FPress and pressThe TRow boardOr said TChangeable pipeIs greater than a corresponding preset value, the I is reducedSL(ii) a Otherwise, increase the stationThe following formula ISLWherein, the ISLLess than the current set point.
In one embodiment of the present invention, the Δ β is calculated by: Δ β ═ Ki∫(ISL-IS) dt; wherein, K isiIs a control coefficient.
In one embodiment of the invention, said varying said β is dependent on said Δ β; further comprising: changing the beta according to the delta beta under the condition that the torque for controlling the compressor is kept unchanged.
In one embodiment of the invention, Δ β comprises a first compensation amount Δ β by which β increases in a positive direction1And a second compensation amount Δ β by which β increases in the negative direction2(ii) a Said altering said β according to said Δ β, comprising: according to the delta beta1Increasing the β in the positive direction; or, according to said Δ β2Increasing the β in the negative direction.
In one embodiment of the present invention, the air conditioner defrosting control method further includes: and when the air conditioner exits the defrosting mode, enabling the delta beta to be 0.
On the other hand, the embodiment of the invention also provides a defrosting control device of an air conditioner, which comprises the following components: the control module is used for controlling the air conditioner to enter a defrosting mode; an acquisition module for acquiring the working current value I of the motor of the compressorSL(ii) a A calculation module for calculating according to the ISLCalculating to obtain a current vector ISA compensation amount delta beta of an included angle beta with the q axis; a means for adjusting said β based on said Δ β.
In another aspect, an embodiment of the present invention further provides an air conditioner, including a memory storing a computer program and a package IC, where the computer program is read by the package IC and executed by the package IC, and the air conditioner implements the air conditioner defrosting control method according to any one of the above embodiments.
In summary, the above embodiments of the present application may have one or more of the following advantages or benefits: i) the heating power of the compressor is improved, and the defrosting time is shortened to improve the indoor comfort; i.e. ii) Take the said ISLThe current of the motor is ensured to have certain increase allowance and the heating power of the compressor is ensured to be as large as possible, so that the safety of the air conditioner is improved; iii) according to said FPress and pressThe TRow boardOr said TChangeable pipeAt least one of which controls said ISLThe heating power of the compressor can be flexibly controlled according to the actual working condition of the air conditioner, and the reliability of the air conditioner is improved.
Drawings
Fig. 1 is a flowchart illustrating a defrosting control method for an air conditioner according to a first embodiment of the present invention.
Fig. 2 is a circuit connection diagram of a control circuit for implementing the defrosting control method of the air conditioner shown in fig. 1.
Fig. 3 is a block diagram of a defrosting control device 100 for an air conditioner according to a second embodiment of the present invention.
Fig. 4 is a block diagram of an air conditioner 200 according to a third embodiment of the present invention.
Fig. 5 is a block diagram of a readable storage medium 300 according to a fourth embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
[ first embodiment ] A method for manufacturing a semiconductor device
Referring to fig. 1, a flowchart of a defrosting control method for an air conditioner according to a first embodiment of the present invention is shown. The defrosting control method of the air conditioner comprises the following steps:
and step S10, controlling the air conditioner to enter a defrosting mode.
For example, when the air conditioner heats and meets the defrosting condition, the air conditioner is controlled to enter a defrosting mode to perform normal defrosting, and the following steps S20-S40 are performed to assist defrosting by increasing the heating power of the compressor. Therefore, the defrosting efficiency can be improved, the defrosting time can be shortened, and the indoor comfort can be improved.
Step S20, obtaining the working current value I of the motor of the compressorSL。
Step S30, according to the ISLCalculating to obtain a current vector ISThe amount of compensation Δ β for the angle β with the q-axis.
Step S40, changing the β according to the Δ β.
In step S20, the demagnetization current I of the motor may be obtained first1And the maximum operating current I of the power module of the electrical machine2Taking out the above I1And said I2The smaller of the ISL(ii) a Wherein the power module may be an IPM power module of the electric machine, the I1And said I2Can be derived from the specification of the motor.
Further, x times the smaller is taken as the ISLAnd x is less than or equal to 0.8. Such as the said I1Is less than the I2Then, 0.8 × I1As said ISLOf course, 0.7 × I may be added1As said ISL。
Wherein, the step S20 may further include: acquiring system pressure F of the air conditioner through related sensorsPress and pressThe discharge temperature T of the compressorRow boardOr temperature value T of outdoor unit heat exchangerChangeable pipeAt least one parameter of. If said F isPress and pressThe TRow boardOr said TChangeable pipeIf any one of the values is greater than the corresponding preset value, the value of I is reduced on the original basisSL(ii) a Otherwise, increasing the I on the original basisSLHowever, increasing the ISLThe current preset value cannot be exceeded.
Specifically, the preset current value may be the I1And said I20.8 times the smaller of the two. For example, the ISLHas an initial value of 0.7 x I1Obtaining said FPress and pressAnd the preset value corresponding to the system pressure of the air conditioner is F1(ii) a At FPress and press＞F1While decreasing said ISLIs 0.65 × I1At FPress and press≤F1While increasing the ISLIs 0.75 × I1。
As can be seen, the ISLThe working state of the air conditioner is different, and the air conditioner mainly passes through the FPress and pressThe TRow boardOr said TChangeable pipeAnd said I, and1and said I2The smaller of them.
In step S30, the Δ β is calculated by: Δ β ═ Ki∫(ISL-IS)dt。
Specifically, the K isiIs a control coefficient. And the Δ β includes a first compensation amount Δ β by which the β increases in a positive direction1And a second compensation amount Δ β by which β increases in the negative direction2。
Correspondingly, the step S40 includes that the Δ β is determined according to the value1Increasing the β in the positive direction; or, according to said Δ β2Increasing the β in the negative direction.
The defrosting control method of the air conditioner further comprises the following steps: and when the air conditioner finishes defrosting and exits from the defrosting mode, enabling the delta beta to be 0 or keeping the beta unchanged.
Referring to fig. 2, it is a schematic circuit connection diagram of a control circuit for implementing the defrosting control method of the air conditioner. The principle of the air conditioner for realizing the defrosting control method through the control circuit is as follows:
wherein, the DC bus voltage udcThe motor current sampling circuit is obtained by connecting two resistors in series to form a voltage sampling circuit for sampling, and u-phase and v-phase working currents i of the motor are sampled by a Hall current sensoruAnd iv. Through said iuAnd said ivFrom the node current theorem, the formula can be: i.e. iw＝-iu-ivAnd calculating to obtain the value i of the increased power current of the motorw。
Wherein, the current i under the two-phase static coordinate systemdAnd iqCan be calculated by the following calculation formulas respectively.
id＝iαcosθ+iβsinθ，iq＝iβcosθ-iαsin theta; wherein iα＝iu，
Figure BDA0003104959690000052
The θ is a rotor position of the motor and can be obtained by an existing position estimation algorithm.
Wherein the motor speed control module is used for controlling the motor speed according to the rotating speed reference value Wr-RefAnd actual value of rotation speed Wr. Using a PI regulator, let WrAnd said Wr-RefEquality, calculating the torque current I of said motorSThe calculation formula is as follows: i isS＝Kp*(Wr_Ref-Wr)+Ki*∫(Wr_Ref-Wr) dt; wherein, K ispIs a scaling factor.
d-axis current reference value Id-RefAnd q-axis current reference value Iq-RefCan be calculated by the following formula respectively. Wherein, Id-Ref＝IS*sinβ，Iq-Ref＝ISCos β. Beta is a current vector IS(or actual value of current of said motor) and q-axis, β ═ Δ β + β0(ii) a Wherein the Δ β is a compensation amount of the β, the β0The included angle obtained at the previous moment.
Wherein the delta beta passes through the working current value I of the motorSLAnd said ISAccording to the formula: Δ β ═ Ki∫(ISL-IS) dt is calculated. Wherein, the
Figure BDA0003104959690000051
Said ISLThe calculation is carried out through a calculation module; the calculation module is used for calculating the system pressure F of the air conditionerPress and pressThe discharge temperature T of the compressorRow boardOr temperature value T of outdoor unit heat exchangerChangeable pipeAnd a demagnetization current I of the electric machine1And the maximum operating current I of the IPM power module of the electric machine2The smaller of these; for details, reference may be made to the above process, which is not described herein again.
The current control module may be dependent on said Id-RefAnd said Iq-RefAnd the actually sampled d-axis current IdAnd q-axis current IqAnd d-axis output voltage U is obtained through calculationdAnd q-axis output voltage Uq. A suitable regulator, such as a PI regulator or a fuzzy regulator, may be used to make Id-Ref＝IdAnd Iq-Ref＝IqThe expression is:
Ud＝Kp*(Id_Ref-Id)+Ki*∫(Id_Ref-Id)dt；Uq＝Kp*(Iq_Ref-Iq)+Ki*∫(Iq_Ref-Iq)dt。
the PWM modulation module is used for modulating the signal according to the UdAnd said UqCalculating to obtain UVAnd UWTo ensure that the direct-axis voltage of the motor is equal to UdQuadrature axis voltage equal to Uq. The calculation process is as follows:
uα＝udcosθ-uqsinθ；
uβ＝udsinθ+uqcosθ；
uu＝uα；
Figure BDA0003104959690000061
Figure BDA0003104959690000062
the PWM modulation module is provided with a triangular wave generator and three comparators, and each comparator is provided with a corresponding comparison value Compou, ComPV and ComPW respectively. The outputs of the three comparators are: PWM _ U, PWM _ V and PWM _ W; when the comparison value is smaller than the triangular wave amplitude value, the output of the comparator is 0. For example, the frequency f of a triangular wave generated by a triangular wave generator is 5KHz, and the peak value of the triangular wave is a.
WhereinThree-phase voltage U expected to be output by inverter circuitU-N、UV-NAnd UW-NThe calculation formulas of (A) and (B) are respectively as follows:
Figure BDA0003104959690000063
the three comparison values corresponding to the three comparators are respectively according to the UU-NThe UV-NAnd the UW-NAnd calculating to obtain the following calculation formulas:
CompU＝A*UU-N/udc；CompV＝A*UV-N/udc；CompW＝A*UW-N/udc。
the three comparators output the PWM _ U, the PWM _ V and the PWM _ W, and when a comparison value is larger than the triangular wave amplitude value, the comparator output is 1; when the comparison value is smaller than the triangular wave amplitude value, the output of the comparator is 0; thereby controlling the on or off of the IGBT of the motor, leading the inverter circuit to output proper voltage, and controlling the actual current value of the motor to be close to or equal to the Id-RefAnd said Iq-Ref。
[ second embodiment ]
Referring to fig. 3, a block diagram of a defrosting control device for an air conditioner according to a second embodiment of the present invention is shown. The air conditioner defrosting control device 100 includes, for example: the control module 110 is used for controlling the air conditioner to enter a defrosting mode; an obtaining module 120 for obtaining a working current value I of a motor of the compressorSL(ii) a A calculation module 130 for calculating the ISLCalculating to obtain a current vector ISA compensation amount delta beta of an included angle beta with the q axis; a regulating module 140 for increasing the β in accordance with the Δ β.
In a specific embodiment, the control module 110, the obtaining module 120, the calculating module 130 and the adjusting module 140 of the air conditioner defrosting control apparatus 100 cooperate to implement the air conditioner defrosting control method described in the first embodiment, which is not described herein again.
[ third embodiment ]
Referring to fig. 4, which is a block diagram of an air conditioner according to a third embodiment of the present invention, the air conditioner 200 includes, for example, a package IC220 and a memory 210 electrically connected to the package IC220, the memory 210 stores a computer program 211, and when the computer program 211 is read by the package IC220 and is run, the air conditioner 200 implements the air conditioner defrosting control method according to the first embodiment.
In one embodiment, the packaged IC220 is, for example, a processor chip electrically connected to the memory 210 for reading and executing the computer program. The packaged IC220 may also be a packaged circuit board that encloses a processor chip that can read and execute the computer program 211; of course, the circuit board may also encapsulate the memory 210.
On the other hand, the processor chip may further be provided with the air conditioner defrosting control device 100 according to the second embodiment, and the processor chip may implement the air conditioner defrosting control method according to the first embodiment through the air conditioner defrosting control device 100, which is not described herein again.
[ fourth example ] A
Referring to fig. 5, which is a schematic structural diagram of a readable storage medium according to a fourth embodiment of the present invention, the readable storage medium 300 is, for example, a non-volatile memory, and is, for example: magnetic media (e.g., hard disks, floppy disks, and magnetic tape), optical media (e.g., CDROM disks and DVDs), magneto-optical media (e.g., optical disks), and hardware devices specially constructed for storing and executing computer-executable instructions (e.g., Read Only Memories (ROMs), Random Access Memories (RAMs), flash memories, etc.). The readable storage medium 300 has stored thereon computer-executable instructions 310. The readable storage medium 300 may be executable by one or more processors or processing devices to execute the computer-executable instructions 310 to cause an air conditioner in which it is located to implement the air conditioner defrost control method as described in the first embodiment.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. A defrosting control method of an air conditioner is characterized by comprising the following steps:
controlling the air conditioner to enter a defrosting mode;
obtaining the working current value I of the motor of the compressorSL；
According to the formula ISLCalculating to obtain a current vector ISA compensation amount delta beta of an included angle beta with the q axis;
altering said β according to said Δ β.
2. The air conditioner defrosting control method of claim 1, wherein the obtaining of the operating current value I of the motor of the compressorSL(ii) a The method comprises the following steps:
acquiring demagnetization current I of the motor1And the maximum operating current I of the power module of the electrical machine2；
According to the formula I1And said I2The smaller of which is given by said ISL。
3. The air conditioner defrost control method of claim 2, wherein said I is said1And said I2The smaller of which is given by said ISL(ii) a The method comprises the following steps:
to obtain the said I1And said I2The smaller of these;
taking x times of the smaller as the ISL(ii) a Wherein x is less than or equal to 0.8.
4. The air conditioner defrosting control method of claim 1, wherein the obtaining of the operating current value I of the motor of the compressorSL(ii) a The method comprises the following steps:
obtaining a system pressure value F of the air conditionerPress and pressThe discharge temperature T of the compressorRow boardOr temperature value T of outdoor unit heat exchangerChangeable pipe；
At said FPress and pressThe TRow boardOr said TChangeable pipeIs greater than a corresponding preset value, the I is reducedSL(ii) a Otherwise increase the ISLWherein, the ISLLess than the current set point.
5. The air conditioner defrost control method of claim 1, wherein the calculation formula of Δ β is: Δ β ═ Ki∫(ISL-IS) dt; wherein, K isiIs a control coefficient.
6. The air conditioner defrost control method of claim 1, wherein said varying said β is in accordance with said Δ β; further comprising:
changing the beta according to the delta beta under the condition that the torque for controlling the compressor is kept unchanged.
7. The air conditioner defrost control method of claim 1 wherein the Δ β includes a first compensation amount Δ β by which the β increases in a positive direction1And a second compensation amount Δ β by which β increases in the negative direction2(ii) a Said altering said β according to said Δ β, comprising:
according to the delta beta1Increasing the β in the positive direction; or
According to the delta beta2Increasing the β in the negative direction.
8. The air conditioner defrost control method of claim 1, further comprising:
and when the air conditioner exits the defrosting mode, enabling the delta beta to be 0.
9. An air conditioner defrosting control device, comprising:
the control module is used for controlling the air conditioner to enter a defrosting mode;
an acquisition module for acquiring the working current value I of the motor of the compressorSL；
A calculation module for calculating according to the ISLCalculating to obtain a current vector ISA compensation amount delta beta of an included angle beta with the q axis;
a means for adjusting said β based on said Δ β.
10. An air conditioner comprising a memory storing a computer program and a packaged IC, wherein the computer program is read by and executed by the packaged IC, and the air conditioner implements the air conditioner defrost control method according to any one of claims 1-8.
CN202110634567.4A 2021-06-08 2021-06-08 Air conditioner defrosting control method and device and air conditioner Active CN113432246B (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002350034A (en) * 2001-05-25 2002-12-04 Mitsubishi Electric Corp Method of installing refrigerator and heating heater
CN109059192A (en) * 2018-06-20 2018-12-21 广东美的制冷设备有限公司 The control method and device of compressor winding heating

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002350034A (en) * 2001-05-25 2002-12-04 Mitsubishi Electric Corp Method of installing refrigerator and heating heater
CN109059192A (en) * 2018-06-20 2018-12-21 广东美的制冷设备有限公司 The control method and device of compressor winding heating

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