Air conditioner and air volume compensation method

Abstract

The invention provides an air conditioner and an air volume compensation method. The air volume compensation method comprises the following steps that S1, the standard power of a motor after the air conditioner works under the rated heating condition and is kept not frosted for the first time is obtained; s2, calculating the real-time power of the motor after the second heating time after the air conditioner is heated or defrosted; and S3, adjusting the rotating speed of the motor based on the difference value between the real-time power and the standard power. According to the method, the power of the motor of the outdoor fan in the non-frosting state is obtained and serves as a power standard value in the use scene, in the subsequent operation defrosting process, through comparison of the real-time power and the standard power, when the real-time power is reduced to the set proportion threshold value of the standard power, the rotating speed is automatically increased for air volume compensation, and the air volume compensation efficiency is improved. The outdoor heat exchange capacity is improved, the frosting period is prolonged, and indoor temperature fluctuation caused by frequent defrosting is reduced.

Description

Technical Field

[0001] The present invention relates to the field of air conditioning, and in particular to an air conditioning and air volume compensation method. Background Art

[0002] At present, when the split air conditioner is in low-temperature heating operation, the outdoor heat exchanger is used as the evaporator, and the refrigerant evaporation temperature will be lower than 0℃, causing the surface of the outdoor heat exchanger fins to frost continuously. Once the air volume is reduced after frost, the outdoor heat exchange capacity will also be reduced, causing the evaporation temperature to drop sharply and the frost to form more quickly, thus entering a cycle of significantly deteriorating air volume and heat exchange capacity. The experience for consumers is that the heating capacity of the air conditioner is getting lower and lower, and the air conditioner quickly enters defrost control, and the room temperature fluctuates greatly, bringing uncomfortable use effects. Therefore, an effective air conditioning heating control method is needed. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides an air conditioner and air volume compensation method, which mainly solves the problem that the prior art lacks an effective air conditioner heating control method.

[0004] The objective of the present invention is achieved through the following solutions:

[0005] In a first aspect, according to an embodiment of the present invention, there is provided a wind volume compensation method, comprising the following steps: S1, obtaining the standard power of the motor after the air conditioner operates under rated heating conditions and remains frosted for a first time; S2, calculating the real-time power of the motor after the air conditioner heats or defrosts for a second time; S3, adjusting the speed of the motor based on the difference between the real-time power and the standard power.

[0006] According to an embodiment of the present invention, the rated heating condition is that the ambient temperature is between 2 degrees and 7 degrees, and the first time is any time between 3 minutes and 10 minutes.

[0007] According to an embodiment of the present invention, the second time is any time between 15 minutes and 30 minutes.

[0008] According to an embodiment of the present invention, the real-time power of the motor after the second heating time after the air conditioner heating or defrosting ends is calculated as follows: S21, obtain the U-phase current and the V-phase current in the three-phase current of the motor, and calculate the Q-axis current and the D-axis current of the motor respectively; S22, calculate the Q-axis voltage and the D-axis voltage of the motor according to the calculated Q-axis current and the D-axis current of the motor in combination with the obtained motor speed; S23, calculate the real-time power of the motor according to the motor current and the motor voltage.

[0009] According to an embodiment of the present invention, the Q-axis current and the D-axis current are respectively:

[0010] Iq=-32*Iu*sinθ+Iu+2*Iv*cosθ,

[0011] Id=32*Iu*cosθ+Iu+2*Iv*sinθ,

[0012] Among them, Iq is the Q-axis current, Id is the D-axis current, Iu is the U-phase current, Iv is the V-phase current, and θ is the position of the motor rotor.

[0013] According to an embodiment of the present invention, the Q-axis voltage and the D-axis voltage are respectively:

[0014] Uq=R*Iq+Lq*p*Iq+ωr*Ld*Id+e0,

[0015] Ud=R*Id+Ld*p*Id-ωr*Lq*Iq,

[0016] Among them, R is the motor resistance, Lq is the motor Q-axis inductance, Ld is the motor D-axis inductance, ωr is the motor speed, p is the differential operator, and e0 is the motor no-load electromotive force.

[0017] According to an embodiment of the present invention, the real-time power is:

[0018] PMOTOR=Uq*Iq+Ud*Id,

[0019] Among them, PMOTOR is the real-time power of the motor.

[0020] According to an embodiment of the present invention, the speed of the motor is adjusted based on the difference between the real-time power and the standard power as follows: when the ratio of the real-time power to the standard power is less than a first ratio value, the first speed is increased; or when the ratio of the real-time power to the standard power is less than a second ratio value, the second speed is increased, wherein the second ratio value is less than the first ratio value, and the second speed is greater than the first speed.

[0021] According to an embodiment of the present invention, the first ratio value is 0.98, and the first rotation speed is any one of 5 to 20 revolutions per minute; the second ratio value is 0.92, and the second rotation speed is any one of 10 to 30 revolutions per minute.

[0022] In a second aspect, according to another embodiment of the present invention, an air conditioner is provided, comprising: a controller, which adopts an air volume compensation method as described in the first aspect to control the rotation speed of a motor; and a motor, which is used to provide a power source for a compressor.

[0023] Compared with the prior art, the present invention has the following beneficial effects: the power of the outdoor fan motor in the unfrosted state is obtained, and this is used as the power standard value in this usage scenario; in the subsequent defrosting process, by comparing the real-time power with the standard power, when the real-time power drops to the set proportional threshold of the standard power, the speed is automatically increased to compensate for the air volume, thereby improving the outdoor heat exchange capacity, extending the frosting cycle, and reducing the temperature fluctuations in the room caused by frequent defrosting. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The embodiments of the present invention are further described below with reference to the accompanying drawings:

[0025] Figure 1 Schematic diagram of the flow chart of the air volume compensation method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0026] Before proceeding to the following detailed description, it may be advantageous to set forth the definitions of certain words and phrases used throughout this patent document. The terms "coupling", "connection" and their derivatives refer to any direct or indirect communication or connection between two or more elements, regardless of whether those elements are in physical contact with each other. The terms "transmission", "reception" and "communication" and their derivatives cover direct and indirect communication. The terms "include" and "comprising" and their derivatives refer to including but not limited to. The term "or" is inclusive, meaning and / or. The phrase "associated with..." and its derivatives refer to including, including within, interconnecting, containing, contained within, connecting or connecting with, coupling or coupling with, communicating with, cooperating, interweaving, parallel, close to, binding or binding with, having, having attributes, having a relationship or having a relationship with, etc. The term "controller" refers to any device, system or part thereof that controls at least one operation. Such a controller can be implemented with hardware, or a combination of hardware and software and / or firmware. The functions associated with any particular controller can be centralized or distributed, whether local or remote. The phrase "at least one of", when used with a list of items, means that different combinations of one or more of the listed items may be used, and only one of the items in the list may be required. For example, "at least one of A, B, C" includes any of the following combinations: A, B, C, A and B, A and C, B and C, A and B and C.

[0027] Definitions for other specific words and phrases are provided throughout this patent document. Those of ordinary skill in the art should understand that in many, if not most instances, such definitions apply to prior and future uses of such defined words and phrases.

[0028] In this patent document, the application combination of modules and the division level of sub-modules are only used for illustration, and the application combination of modules and the division level of sub-modules may have different forms without departing from the scope of the present disclosure.

[0029] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below through specific embodiments in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0030] As described in the background technology, the prior art lacks an effective air conditioning heating control method. Figure 1 As shown, according to an embodiment of the present invention, a method for air volume compensation is provided, comprising the following steps: S1, obtaining the standard power of the motor of the air conditioner after working under the rated heating condition and maintaining no frost for the first time; S2, calculating the real-time power of the motor after the air conditioner heats or defrosts for the second time; S3, adjusting the speed of the motor based on the difference between the real-time power and the standard power. The power of the outdoor fan motor in the unfrosted state is obtained, and used as the power standard value in this usage scenario. In the subsequent frosting process, by comparing the real-time power with the standard power, when the real-time power drops to the set ratio threshold of the standard power, the speed is automatically increased to compensate for the air volume, thereby improving the outdoor heat exchange capacity, extending the frosting cycle, and reducing the temperature fluctuations caused by frequent defrosting in the room.

[0031] In order to ensure efficiency, the critical condition for frosting is obtained according to the operation of the system. According to an embodiment of the present invention, the rated heating condition is that the ambient temperature is between 2 degrees and 7 degrees, and the first time is any time between 3 minutes and 10 minutes. For example, one possible situation is that when the ambient temperature is 5 degrees, the heat exchanger is still not frosted 5 minutes after the system heating is turned on, and the air conditioner motor power at this time is used as the standard power.

[0032] In order to obtain a stable value of the motor power of the air conditioner during heating or frosting, according to an embodiment of the present invention, the second time is any time between 15 minutes and 30 minutes.

[0033] For the convenience of measurement, according to an embodiment of the present invention, the real-time power of the motor after the second heating time after the air conditioner heating or defrosting ends is calculated as follows: S21, obtain the U-phase current and the V-phase current in the three-phase current of the motor, and calculate the Q-axis current and the D-axis current of the motor respectively; S22, calculate the Q-axis voltage and the D-axis voltage of the motor according to the calculated Q-axis current and D-axis current of the motor in combination with the obtained motor speed; S23, calculate the real-time power of the motor according to the motor current and the motor voltage.

[0034] In detail, after obtaining the U-phase current and the V-phase current, the axis current can be calculated. According to an embodiment of the present invention, the Q-axis current and the D-axis current are respectively:

[0035] Iq=-32*Iu*sinθ+Iu+2*Iv*cosθ,

[0036] Id=32*Iu*cosθ+Iu+2*Iv*sinθ,

[0037] Among them, Iq is the Q-axis current, Id is the D-axis current, Iu is the U-phase current, Iv is the V-phase current, and θ is the position of the motor rotor.

[0038] Similarly, after the shaft current is obtained, the real-time voltage of the DC motor can be obtained. According to an embodiment of the present invention, the Q-axis voltage and the D-axis voltage are respectively:

[0039] Uq=R*Iq+Lq*p*Iq+ωr*Ld*Id+e0,

[0040] Ud=R*Id+Ld*p*Id-ωr*Lq*Iq,

[0041] Among them, R is the motor resistance, Lq is the motor Q-axis inductance, Ld is the motor D-axis inductance, ωr is the motor speed, p is the differential operator, and e0 is the motor no-load electromotive force.

[0042] Finally, after obtaining the motor current and the motor voltage, the running power of the motor is calculated according to the following power calculation formula. According to an embodiment of the present invention, the real-time power is:

[0043] PMOTOR=Uq*Iq+Ud*Id,

[0044] Among them, PMOTOR is the real-time power of the motor.

[0045] During the frosting process, the heat exchanger frosts, resulting in a decrease in the air volume of the heat exchanger. The air volume is directly related to the power consumption of the motor, and the real-time power of the motor will continue to decrease. Therefore, when the ratio of the two reaches a certain ratio threshold, a certain speed increase value is output to make the real-time power of the motor basically consistent with the standard power. According to an embodiment of the present invention, the speed of the motor is adjusted based on the difference between the real-time power and the standard power: when the ratio of the real-time power to the standard power is less than the first ratio value, the first speed is increased, or when the ratio of the real-time power to the standard power is less than the second ratio value, the second speed is increased, wherein the second ratio value is less than the first ratio value, and the second speed is greater than the first speed. In general, the increase principle is that the greater the difference, the greater the increase value.

[0046] According to an embodiment of the present invention, the first ratio value is 0.98, and the first rotation speed is any one of 5 to 20 revolutions per minute; the second ratio value is 0.92, and the second rotation speed is any one of 10 to 30 revolutions per minute.

[0047] In addition, in order to ensure the stability of the motor operation, according to an embodiment of the present invention, a deviation range of the standard power is also set. For example, the power deviation value can be 1 to 3 W, preferably 2 W. The above detection is continued, and the speed increases to the maximum real-time power = standard power ± F (power deviation value).

[0048] According to another embodiment of the present invention, an air conditioner is provided, comprising: a controller, which uses an air volume compensation method as described above to control the rotation speed of a motor; and a motor, which is used to provide a power source for a compressor.

[0049] The present invention may be a system, a method and / or a computer program product. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for causing a processor to implement various aspects of the present invention.

[0050] Computer readable storage medium can be a tangible device that holds and stores instructions used by an instruction execution device. Computer readable storage medium can include, for example, but is not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination thereof. More specific examples (non-exhaustive list) of computer readable storage medium include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disk read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanical encoding device, for example, a punch card or a protruding structure in a groove on which instructions are stored, and any suitable combination thereof.

[0051] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A wind volume compensation method, characterized in that: The following steps are involved: S1. Obtain the standard power of the motor of the air conditioner after it works under rated heating conditions and remains free of frost for the first time; S2, calculating the real-time power of the motor after the air conditioner has finished heating or defrosting for the second time; S3. Adjusting the rotation speed of the motor based on the difference between the real-time power and the standard power.

2. The air volume compensation method according to claim 1, characterized in that: The rated heating condition is that the ambient temperature is between 2 degrees and 7 degrees, and the first time is any time between 3 minutes and 10 minutes.

3. The air volume compensation method according to claim 1, characterized in that: The second time period is any time between 15 minutes and 30 minutes.

4. The air volume compensation method according to claim 1, characterized in that: Calculate the real-time power of the motor after the air conditioner heats or defrosts for the second heating time: S21, obtaining the U-phase current and the V-phase current of the motor three-phase current, and calculating the Q-axis current and the D-axis current of the motor respectively; S22, combining the acquired motor speed and calculating the Q-axis voltage and the D-axis voltage of the motor according to the calculated Q-axis current and the D-axis current of the motor; S23. Calculate the real-time power of the motor according to the motor current and the motor voltage.

5. The air volume compensation method according to claim 4, characterized in that: The Q-axis current and the D-axis current are respectively: Iq=-32*Iu*sinθ+Iu+2*Iv*cosθ, Id=32*Iu*cosθ+Iu+2*Iv*sinθ, Among them, Iq is the Q-axis current, Id is the D-axis current, Iu is the U-phase current, Iv is the V-phase current, and θ is the position of the motor rotor.

6. The air volume compensation method according to claim 5, characterized in that: The Q-axis voltage and the D-axis voltage are respectively: Uq=R*Iq+Lq*p*Iq+ωr*Ld*Id+e0, Ud=R*Id+Ld*p*Id-ωr*Lq*Iq, Among them, R is the motor resistance, Lq is the motor Q-axis inductance, Ld is the motor D-axis inductance, ωr is the motor speed, p is the differential operator, and e0 is the motor no-load electromotive force.

7. The air volume compensation method according to claim 6, characterized in that: The real-time power is: PMOTOR=Uq*Iq+Ud*Id, Among them, PMOTOR is the real-time power of the motor.

8. The air volume compensation method according to claim 6, characterized in that: The speed of the motor is adjusted based on the difference between the real-time power and the standard power: When the ratio of the real-time power to the standard power is less than a first ratio value, increasing a first rotation speed; or when the ratio of the real-time power to the standard power is less than a second ratio value, increasing the second speed, The second ratio value is smaller than the first ratio value, and the second rotation speed is greater than the first rotation speed.

9. The air volume compensation method according to claim 8, characterized in that: The first ratio value is 0.98, and the first rotation speed is any one of 5 to 20 revolutions per minute; the second ratio value is 0.92, and the second rotation speed is any one of 10 to 30 revolutions per minute.

10. An air conditioner, characterized in that: include: A controller, using an air volume compensation method as described in any one of claims 1 to 9 to control the speed of the motor; The motor is used to provide a power source for the compressor.

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