CN113266931A - Variable frequency control method and system of air conditioner and air conditioner - Google Patents
Variable frequency control method and system of air conditioner and air conditioner Download PDFInfo
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/54—Control or safety arrangements characterised by user interfaces or communication using one central controller connected to several sub-controllers
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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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
- F24F11/62—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
- F24F11/65—Electronic processing for selecting an operating mode
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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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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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
- F24F11/88—Electrical aspects, e.g. circuits
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- 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
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Abstract
The invention provides a variable frequency control method and system of an air conditioner and the air conditioner, wherein the method comprises the following steps: acquiring a first gear setting instruction, starting a low power consumption mode according to the first gear setting instruction, and determining a first limiting current corresponding to the first gear setting instruction according to the corresponding relation between each gear setting instruction and each limiting current; acquiring actual operating current of the outdoor unit and the indoor unit of the air conditioner; and adjusting the frequency of a compressor in the air conditioner according to the relation between the actual operation current of the outdoor unit and the first limiting current. The invention solves the problems that in the prior art, the air conditioner is used under the condition of power supply deficiency, other electrical appliances in the whole house cannot be started, so that the living standard of a user is reduced, and the utilization rate of the air conditioner is not high in the region with power supply deficiency.
Description
Technical Field
The invention relates to the field of air conditioning equipment, in particular to a variable frequency control method and system of an air conditioner and the air conditioner.
Background
In some areas with power supply shortage, the phenomenon that a user uses a generator to generate power can occur. The small generator integrally provides little electric energy for a household power grid, the air conditioner belongs to a high-power electric appliance, when the air conditioner is started, the air conditioner consumes too much electric energy of the generator, and the residual electric energy of the generator cannot meet the requirement of a user on starting other household electric appliances.
When the weather is hot and the power supply is lack, and a user uses the generator to generate electricity, the user opens the air conditioner to enjoy cooling and occupy most electric energy, so that other electrical appliances in the whole house, such as a television, a washing machine and the like, cannot be opened, the living standard of the user is reduced, and the utilization rate of the air conditioner in the area lacking the power supply is not high.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
In view of the above-mentioned deficiencies of the prior art, an object of the present invention is to provide an inverter control method and system for an air conditioner, and an air conditioner, which solve the problems in the prior art that the air conditioner is used in the absence of power supply, so that other appliances in the whole house cannot be turned on, which results in a reduction in the living standard of the user, and a low utilization rate of the air conditioner in the area with the absence of power supply.
The invention provides a variable frequency control method of an air conditioner, which comprises the following steps:
acquiring a first gear setting instruction, starting a low power consumption mode according to the first gear setting instruction, and determining a first limiting current corresponding to the first gear setting instruction according to the corresponding relation between each gear setting instruction and each limiting current;
acquiring actual operating current of the outdoor unit and the indoor unit of the air conditioner;
and adjusting the frequency of a compressor in the air conditioner according to the relation between the actual operation current of the outdoor unit and the first limiting current.
Further, setting the first limiting current to I1The actual running current of the external unit is IOutdoor unit practiceThe adjusting the frequency of the compressor in the air conditioner according to the relationship between the actual operation current of the outdoor unit and the first limit current includes:
if aI1≤IOutdoor unit practice＜bI1Increasing the frequency of the compressor by a preset acceleration rate;
wherein a is more than b and less than 1.
Further, the adjusting the frequency of the compressor in the air conditioner according to the relationship between the actual operation current of the outdoor unit and the first limit current includes:
if b is1≤IOutdoor unit practice＜cI1Maintaining the compressor frequency;
wherein b is less than 1 and less than c.
Further, the adjusting the frequency of the compressor in the air conditioner according to the relationship between the actual operation current of the outdoor unit and the first limit current includes:
if cI1≤IOutdoor unit practiceThen the compressor frequency is reduced at a preset reduced speed.
Further, the preset speed increasing rate is 90s/1 Hz; and/or
The preset deceleration is 1s/11 Hz.
Further, each gear setting instruction includes: a first gear instruction, a second gear instruction and a third gear instruction;
the limiting current corresponding to the first gear instruction is greater than the limiting current corresponding to the second gear instruction, and the limiting current corresponding to the second gear instruction is greater than the limiting current corresponding to the third gear instruction;
the first gear setting instruction is any one of the first gear instruction, the second gear instruction and the third gear instruction.
Further, after the step of adjusting the frequency of the compressor in the air conditioner according to the relationship between the actual operation current of the outdoor unit and the first limit current, the method further includes:
if the frequency of the compressor is lower than the lowest running frequency of the compressor, the actual running current of the outer machine is higher than the cI1And if the maintaining time is longer than the first preset time, the external unit is closed.
Further, if the frequency of the compressor is lower than the lowest operating frequency of the compressor, the actual operating current of the outer unit is higher than the cI1And the maintaining time is longer than a first preset time, after the step of closing the outdoor unit, the method further comprises:
after the low-gear setting instruction is adjusted to a high-gear setting instruction, the external machine is restarted after the external machine is kept closed for a second preset time;
and the limiting current corresponding to the low gear setting instruction is smaller than the limiting current corresponding to the high gear setting instruction.
An inverter control system of an air conditioner, comprising: the control module is respectively and electrically connected with the outer machine current detection module and the frequency conversion module, and the frequency conversion module is electrically connected with the compressor;
wherein the content of the first and second substances,
the control module is used for acquiring a first gear setting instruction, starting a low power consumption mode according to the first gear setting instruction, and determining a first limiting current corresponding to the first gear setting instruction according to the corresponding relation between each gear setting instruction and each limiting current;
the outdoor unit current detection module is used for detecting the actual operating current of an outdoor unit;
the control module is used for acquiring the actual operating current of the outdoor unit in the air conditioner, and the control module is further used for sending an adjusting instruction to the frequency conversion module according to the relation between the actual operating current of the outdoor unit and the first limiting current, so that the frequency conversion module adjusts the frequency of the compressor in the air conditioner according to the adjusting instruction.
An air conditioner comprises an air conditioner internal unit and an air conditioner external unit, wherein a processor and a memory are arranged in the air conditioner internal unit, and the processor and the memory are in communication connection through a communication bus;
a compressor is arranged in the air conditioner external unit;
the memory stores a program of an inverter control method of an air conditioner, which when executed by the processor implements the inverter control method of an air conditioner as described above.
Has the advantages that: the invention relates to a variable frequency control method and system of an air conditioner and the air conditioner, when the electric energy is lack, such as the electricity is supplied by a generator, a first gear setting instruction can be sent to the air conditioner by combining the household electricity utilization condition of a user, the air conditioner starts a low power consumption mode according to the first gear setting instruction, the air conditioner determines a first limiting current corresponding to the first gear setting instruction according to the corresponding relation between each gear setting instruction and each limiting current, the frequency of a compressor is adjusted according to different comparison results according to the relation between the actual running current of an external machine and the first limiting current, the running current of the compressor can be changed while the frequency of the compressor is adjusted, so that the actual running current of the external machine is changed along with the first limiting current, the actual running current of the external machine is positioned at the maximum limiting current after the frequency of the compressor is adjusted for a period of time (obtained based on the first limiting current, the value is larger than a first limit current value), the actual running current of the outdoor unit is limited, so that the power consumption of the air conditioner can be properly controlled when the generator is used for generating power, the user can enjoy the air conditioner for cooling and can start the whole house electrical appliance, the living standard of the user is improved, and the utilization rate of the air conditioner is improved.
Drawings
Fig. 1 is a flowchart illustrating an exemplary method for controlling an inverter of an air conditioner according to the present invention.
Fig. 2 is a flowchart illustrating an inverter control method of an air conditioner according to a preferred embodiment of the present invention.
Fig. 3 is a schematic circuit block diagram of an inverter control system of an air conditioner according to the present invention.
Fig. 4 is a circuit diagram of an inverter control system of an air conditioner according to the present invention.
In the figure: 10. an outdoor unit current detection module; 20. a control module; 30. a frequency conversion module; 40. a compressor.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The main differences between the existing variable frequency air conditioner and the ordinary air conditioner or the fixed-speed air conditioner are as follows: a frequency converter is added in the variable frequency air conditioner. The processor of the frequency conversion air conditioner collects the relevant information of the indoor environment at any time and compares the information with the internal set value, and the control signal is output through operation processing. For example: the working principle of the AC frequency conversion air conditioner is that the power frequency AC is converted into the DC power supply and sent to the power module (high power transistor switch combination), and the module is controlled by the control signal sent by the processor to output the frequency-adjustable AC power supply (the synthesized waveform is similar to sine wave), so that the rotating speed of the compressor motor changes correspondingly with the change of the power supply frequency. Different from a fixed-frequency air conditioner, the variable-frequency air conditioner can generally adjust the temperature in the space more accurately according to the change of the indoor temperature through an intelligent chip. In the whole monitoring process, the compressor does not stop running, but the running speed of the compressor can adjust the rotating speed according to the temperature change, so that the temperature of the whole space can be kept constant. The compressor of the inverter air conditioner can not be opened and closed normally, so that high power consumption caused by the continuous opening and closing of the compressor like a fixed-frequency air conditioner is avoided. When the variable frequency air conditioner is started and reaches the set temperature, the variable frequency air conditioner can run at a lower frequency to maintain the set indoor temperature. Therefore, the power consumption of the variable frequency air conditioner is smaller, and the variable frequency air conditioner can save more than 30% of electricity compared with a fixed frequency air conditioner. Meanwhile, due to the low-speed operation, the loss of the variable frequency air conditioner is reduced, and the service life of the variable frequency air conditioner is prolonged.
The relationship between the operating frequency (for convenience of description, hereinafter, the compressor frequency) and the current of the motor of the inverter-controlled compressor is determined according to the characteristics of the motor, for example, when the frequency of the motor with constant torque is reduced, in the motor with proportional decreasing torque: the current and frequency decrease in direct proportion (1:1 ratio). In a motor with a 1.5 power decreasing torque, the current decreases with decreasing frequency by a power of 1.5. In a motor with square decreasing torque, the current decreases with decreasing frequency to the power of 2. In a motor with a three-power decreasing torque, the current decreases 3 times with the decrease of the frequency.
Thus, by varying the compressor frequency, the current required to operate the motor of the compressor can be varied. Thus, when the frequency of the compressor is changed, the current required by the external unit of the air conditioner is changed, and thus the current of the whole air conditioner is changed. With the voltage unchanged, according to P ═ UI. The power of the air conditioner is changed and the power consumed during a period of time is changed.
Therefore, the present embodiment provides an inverter control method of an air conditioner, as shown in fig. 1, including the following steps:
step S100, a first gear setting instruction is obtained, a low power consumption mode is started according to the first gear setting instruction, and a first limiting current corresponding to the first gear setting instruction is determined according to the corresponding relation between each gear setting instruction and each limiting current.
The method specifically comprises the following steps: different gear buttons are arranged on the remote controller, and each gear button can send a gear setting instruction to the air conditioner internal unit. The user triggers the first gear setting instruction, the first gear setting instruction is one of all gear keys with the function of the low power consumption mode, and the air conditioner receives the first gear setting instruction and executes the low power consumption mode according to the first gear setting instruction. That is, when the air conditioner executes the low power consumption mode according to one of the shift keys, the air conditioner enters the low power consumption mode according to one of the shift keys (for example, the first shift setting instruction) only if each shift key has the function of the low power consumption mode.
For convenience of description of the present application, the following describes an inverter control method of the air conditioner by taking one of the gears as an example, that is, taking a first gear setting instruction as one of any gears (all having a low power consumption mode function) set on the remote controller:
the remote controller sends a first gear setting instruction to the air conditioner, the processor of the indoor unit of the air conditioner receives the first gear setting instruction, the processor finds a first limiting current corresponding to the first gear setting instruction according to the corresponding relation between each gear setting instruction and each limiting current, and after the first limiting current is determined, the communication system sends a control instruction to control the outdoor unit of the air conditioner. And obtaining the maximum limiting current corresponding to the first limiting current according to a preset relation by setting the first limiting current, wherein if the value of the maximum limiting current is the value obtained by multiplying the first limiting current value by a coefficient, and the coefficient is more than 1, the maximum limiting current is more than the first limiting current value. And limiting the operation current of the outdoor unit of the air conditioner according to the maximum limiting current when the external power supply is insufficient. It should be noted that, in the low power consumption mode, the maximum limit current value of the gear is smaller than the normal current value of the air conditioner external unit used under the same condition when the power supply is sufficient in the normal power supply mode. Under the normal power supply mode (normal mains supply), when a user triggers the gear button (with the function of the low power consumption mode), the air conditioner runs in low power consumption, and the energy-saving effect is achieved. Under the condition of insufficient power supply (power supply of the generator), when a user triggers the gear button (with a low-power-consumption mode function), the air conditioner runs in low power consumption, and the air conditioning function can be still realized under the condition of insufficient electric energy.
And step S200, acquiring the actual running current of the outdoor unit in the air conditioner.
Specifically, the actual operation current of the external unit is a current value of the external unit of the air conditioner when the air conditioner operates. The detection resistor is arranged on a main power supply circuit of the outdoor unit, the voltage on the detection resistor is measured, the actual operation current of the outdoor unit can be obtained, and the processor of the air conditioner monitors the actual operation current of the outdoor unit in real time.
And step S300, adjusting the frequency of a compressor in the air conditioner according to the relation between the actual operation current of the outdoor unit and the first limiting current.
The method specifically comprises the following steps: and the processor makes corresponding judgment according to the relation between the actual running current of the outdoor unit and the first limiting current acquired in real time. When the actual operation current of the external unit is greater than the maximum limit current value (the value obtained by multiplying the first limit current value by a coefficient, wherein the coefficient is greater than 1), it is indicated that the actual operation current value is too high, which results in a large power of the whole air conditioner. The current running current of the external unit and the actual running current of the external unit are current values of the power supply circuit of the external unit at different moments at the same position.
It is easy to think that in the above steps, the shift key can be arranged not only on the remote controller, but also on the indoor unit of the air conditioner. The gear setting instruction can be set by long pressing the existing keys on the remote controller, for example, long pressing different gear keys, without additionally designing the remote controller, so that the production cost can be reduced while new functions are added.
In the above scheme, when the electric energy is insufficient, such as when the power is supplied by using a generator, a user can trigger a gear button (having a low power consumption mode function) in combination with the household power consumption condition of the user, the remote controller sends a first gear setting instruction to the air conditioner, the air conditioner enters a low power consumption mode according to the first gear setting instruction after receiving the first gear setting instruction, the air conditioner determines a first limiting current corresponding to the first gear setting instruction according to the corresponding relationship between each gear setting instruction and each limiting current, the frequency of the compressor is adjusted according to different comparison results according to the relationship between the actual operating current of the external unit and the first limiting current, the operating current of the compressor is changed while the frequency of the compressor is adjusted, so that the actual operating current of the external unit is changed along with the actual operating current, and after the frequency of the compressor is adjusted for a period of time, the actual operation current of the outdoor unit is below the maximum limit current (the value obtained by multiplying the first limit current value by a coefficient, wherein the coefficient is more than 1), and the actual operation current of the outdoor unit is limited, so that the power consumption of the air conditioner can be properly controlled when the generator is used for generating electricity, a user can enjoy the cooling of the air conditioner and can start the whole house electrical appliance, the living standard of the user is improved, and the utilization rate of the air conditioner is improved.
In this embodiment, if the commercial power is normally supplied, under the sufficient condition of electric energy, need not trigger above-mentioned gear button (the gear case that has low-power consumption mode function), the air conditioner normally operates, if trigger above-mentioned gear button, then the air conditioner can get into the low-power consumption mode, operates below the maximum limiting current of this gear button restriction, has energy-conserving effect. When the power needs to be supplied by the generator after power failure, if the air conditioner is normally started, the electricity generated by the generator may not be enough to normally start the air conditioner, and at the moment, the user triggers the gear button, the air conditioner enters a low-power-consumption mode and operates below the maximum limiting current limited by the gear button, so that the air conditioner can be started and operated.
In the specific implementation process of the scheme, as shown in fig. 2, the detailed steps include:
step S110, obtaining a first gear setting instruction, starting a low power consumption mode according to the first gear setting instruction, and determining a first limiting current corresponding to the first gear setting instruction according to a corresponding relationship between each gear setting instruction and each limiting current.
And step S120, multiplying the value of the first limiting current by different coefficients to obtain different adjustment values, and dividing a plurality of adjustment intervals according to the different adjustment values.
The method specifically comprises the following steps: and the processor of the indoor unit of the air conditioner receives the first gear setting instruction and then sends a control instruction to the outdoor unit of the air conditioner through the communication system. And acquiring a first limiting current value corresponding to the gear setting instruction, wherein the first limiting current value and the corresponding gear setting instruction are preset in the air conditioner. And the processor calculates and multiplies the first limiting current value by different coefficients to respectively obtain a first adjusting value, a second adjusting value and a third adjusting value. The first adjustment value is the maximum (the corresponding coefficient is larger than 1), so that the first adjustment value is also the maximum limiting current, and the current of the outdoor unit of the air conditioner is limited according to the first adjustment value, so that the actual running current of the adjusted outdoor unit of the air conditioner is smaller than the first adjustment value (the maximum limiting current). The second adjustment value is smaller than the first adjustment value, and the third adjustment value is smaller than the second adjustment value. Therefore, different adjustment intervals can be determined according to the first adjustment value, the second adjustment value and the third adjustment value, and when the actual current value of the external unit is detected to be in different adjustment intervals, corresponding adjustment is performed.
In this embodiment, the first limiting current is I1The actual running current of the external unit is IOutdoor unit practice. The first adjustment value is the first limit current value multiplied by c, i.e. the first adjustment value is cI1Where c is a constant greater than 1, such as c is specifically 67/64. The second adjustment value is the first limit current value multiplied by b, i.e. the second adjustment value is bl1Wherein b is a constant less than 1, such as b is specifically 59/64. The third adjustment value is the first current limit value multiplied by a, i.e. the third adjustment value is aI1. Where a is a constant less than b, and a is specifically 54/64. Therefore, one gear setting command is divided into different adjustment intervals according to different adjustment values, and when the air conditioner detects the actual running current value of the outer unit, the actual running current value is according to IOutdoor unit practiceAnd controlling the compressor to perform corresponding adjustment in the corresponding adjustment interval.
And step S210, acquiring the actual running current of the outdoor unit in the air conditioner.
Step S310, if aI1≤IOutdoor unit practice＜bI1Increasing the frequency of the compressor by a preset acceleration rate; wherein a is more than b and less than 1.
Specifically, when aI is detected1≤IOutdoor unit practice＜bI1When the current of the external unit after the frequency of the compressor is adjusted to be at a second adjustment value (bI), the current of the external unit is increased1) And a first adjustment value (cI)1) At a certain current value, the adjustment is stopped. So that the compressor is stabilizedIs run at the frequency of (c). The frequency of the compressor is gradually increased, for example, the preset speed increase is 90s/1Hz, namely 90s is increased to 1 Hz. Therefore, the compressor can stably operate without generating noise, and the use comfort of the air conditioner is improved.
Step S320, if bI1≤IOutdoor unit practice＜cI1Maintaining the compressor frequency, wherein b < 1 < c.
The method specifically comprises the following steps: if b is detected1≤IOutdoor unit practice＜cI1And maintaining the frequency of the compressor when the current running current of the external machine is within a stable interval below a first adjusting value.
Step S330, if cI1≤IOutdoor unit practiceThen the compressor frequency is reduced at a preset reduced speed.
In particular, if cI is detected1≤IOutdoor unit practiceWhen the current of the external unit after the frequency of the compressor is adjusted to be at a second adjustment value (bI), the current of the corresponding motor of the compressor is reduced, so that the current of the external unit of the whole air conditioner is reduced, and the current of the external unit after the frequency of the compressor is adjusted to be at the second adjustment value (bI)1) And a first adjustment value (cI)1) At a certain current value, the adjustment is stopped. So that the compressor operates at a stable frequency. If the preset speed increasing rate is 1s/1Hz, namely 1s is reduced by 1 Hz.
In the above steps, if only one gear is adopted, the actual operation current and the first adjustment value (cI) are used1) And a second adjustment value (bI)1) The compressor frequency is adjusted such that the actual operation current of the outer unit after the compressor frequency is adjusted is at the first adjustment value (cI)1) And a second adjustment value (bI)1) In the stable interval in between. In the scheme, a third adjusting value (aI) is set1) The range to which each gear is adjusted can be differentiated. When the actual running current of the outdoor unit is at the second regulation value (bI)1) In the following, although a large amount of electric energy is consumed by performing an appropriate current rise, the consumed electric energy value can be maintained at the first adjustment value (cI)1) And a second adjustment value (bI)1) Thus realizing air conditioningStable operation and prolonged service life of the air conditioner.
The gear setting instructions in this embodiment include: the first gear setting instruction is any one of the first gear instruction, the second gear instruction and the third gear instruction. The corresponding limiting current in the first-gear instruction is I1The corresponding limiting current in the second gear command is I2The corresponding limiting current in the third gear command is I3. And I1Is less than I2；I2Is less than I3(ii) a First adjustment value (c) in first gear instruction1I1) Less than or equal to the third regulation value (a) in the second gear instruction2I2) First adjustment value (c) in the second gear instruction2I2) Less than or equal to the third regulation value (a) in the third gear instruction3I3). For example, I in the first gear instruction in the embodiment1Specifically 2A, I in the second gear instruction2Specifically 5A, I in the third gear instruction3Specifically 7A.
Step S110, step S120, step S210, step S310, step S320, and step S320 are control procedures of the first gear position command in each gear position setting command. The first gear instruction, the second gear instruction and the third gear instruction can respectively realize the control process. The method specifically comprises the following steps:
when the first gear setting instruction is a first gear instruction, the steps are as follows: acquiring a gear setting instruction, and determining a limiting current corresponding to the gear setting instruction; multiplying the value of the limiting current by different coefficients to obtain different adjustment values through calculation, and dividing a plurality of adjustment intervals according to the different adjustment values; acquiring actual operating current of the outdoor unit and the indoor unit of the air conditioner; if a1I1≤IOutdoor unit practice＜b1I1Increasing the frequency of the compressor by a preset acceleration rate; wherein, a1＜b1Less than 1; if b is1I1≤IOutdoor unit practice＜c1I1Maintaining said compressor frequency, wherein b1＜1＜c1(ii) a If c is1I1≤IOutdoor unit practiceThen decrease by a predetermined amountThe compressor frequency is decreased.
When the first gear setting instruction is a second gear instruction, the steps are as follows: acquiring a second gear setting instruction, and determining a limiting current (I) corresponding to the second gear instruction2) (ii) a Multiplying the value of the limiting current by different coefficients to obtain different adjustment values through calculation, and dividing a plurality of adjustment intervals according to the different adjustment values; acquiring actual operating current of the outdoor unit and the indoor unit of the air conditioner; if a2I2≤IOutdoor unit practice＜b2I2Increasing the frequency of the compressor by a preset acceleration rate; wherein, a2＜b2Less than 1; if b is2I2≤IOutdoor unit practice＜c2I2Maintaining said compressor frequency, wherein b2＜1＜c2(ii) a If c is2I2≤IOutdoor unit practiceThen the compressor frequency is reduced at a preset reduced speed.
When the first gear setting instruction is a third gear instruction, the steps are as follows: obtaining a three-gear setting instruction, and determining a limiting current (I) corresponding to the three-gear instruction3) (ii) a Multiplying the value of the limiting current by different coefficients to obtain different adjustment values through calculation, and dividing a plurality of adjustment intervals according to the different adjustment values; acquiring actual operating current of the outdoor unit and the indoor unit of the air conditioner; if a3I3≤IOutdoor unit practice＜b3I3Increasing the frequency of the compressor by a preset acceleration rate; wherein, a3＜b3Less than 1; if b is3I3≤IOutdoor unit practice＜c3I3Maintaining said compressor frequency, wherein b3＜1＜c3(ii) a If c is3I3≤IOutdoor unit practiceThen the compressor frequency is reduced at a preset reduced speed.
In addition, the above-mentioned a1、a2、a3May be the same or different, as long as the foregoing selection requirements are met, and according to a specific embodiment of the present invention, the above-mentioned a1、a2、a3The values of (a) are the same. B above1、b2、b3May be the same or different, as long as the foregoing selection requirements are met, and according to a specific embodiment of the present invention, the above b1、b2、b3The values of (a) are the same. C above1、c2、c3May be the same or different, as long as the foregoing selection requirements are met, and according to a specific embodiment of the present invention, c is as described above1、c2、c3The values of (a) are the same.
The steps further include: and receiving a gear canceling instruction, and canceling the control step of the first gear setting instruction when the air conditioner receives the gear canceling instruction. Thus, the air conditioner enters a normal use mode, the air conditioner cancels the limitation of the maximum limiting current (obtained by multiplying the first limiting current by a coefficient larger than 1) in the normal use mode, and the air conditioner normally operates.
In the process, the air conditioner has the limitation of the lowest operation frequency when in use, namely, the compressor can normally work only by adopting the frequency higher than the lowest operation frequency, and the air conditioner can realize the functions of refrigeration or/and heating.
Therefore, the frequency conversion control method of the scheme further comprises the following steps:
step S400, if the frequency of the compressor is lower than the lowest running frequency of the compressor, the actual running current of the outer machine is higher than cI1And if the maintaining time is longer than the first preset time, the external unit is closed.
Specifically, when the actual running current of the external unit is larger than or equal to cI1And when the air conditioner is started, reducing the running frequency of the compressor according to the preset speed reduction, and detecting whether the running frequency of the compressor reaches the lowest running frequency of the air conditioner. If the lowest running frequency of the air conditioner is not reached, the actual running current of the outdoor unit is reduced to cI1The following. If the lowest running frequency of the air conditioner is reached, the actual running current of the outer unit is still higher than cI1When the running frequency of the compressor is not reduced any more, the detection is carried out within a continuous first preset time (such as 2 minutes) and when the actual running current of the external unit is higher than cI1And when the air conditioner is started, the air conditioner external unit is closed. The air conditioner is protected.
And S500, after the low gear setting instruction is adjusted to the high gear setting instruction, the external machine is restarted after the external machine is kept closed for a second preset time.
Specifically, after the air conditioner is stopped when the air conditioner reaches the lowest operating frequency of the air conditioner and the actual operating current of the external unit is still higher than the limiting current, the previous first-gear instruction is changed into the second-gear instruction, or the original first-gear instruction and the original second-gear instruction are changed into the third-gear instruction. The air conditioner external unit is controlled to stop for a second preset time (e.g., 2 minutes) and then restarted. Therefore, the air conditioner is subjected to frequency conversion control, the power consumption of the air conditioner is reduced, and the compressor of the air conditioner is protected. The first gear instruction and the second gear instruction are low gear setting instructions relative to the third gear instruction; the first gear command is a low gear setting command relative to the second gear command.
As shown in fig. 3, the present invention further provides an inverter control system of an air conditioner, which includes: the system comprises a control module 10, an outer machine current detection module 20, a frequency conversion module 30 and a compressor 40; the control module 10 is electrically connected to the outdoor unit current detection module 20 and the inverter module 30, respectively, and the inverter module 30 is electrically connected to the compressor 40;
wherein the content of the first and second substances,
the control module is used for acquiring a first gear setting instruction and determining a first limiting current corresponding to the first gear setting instruction according to the corresponding relation between each gear setting instruction and each limiting current;
the outdoor unit current detection module is used for detecting the actual operating current of an outdoor unit;
the control module is used for acquiring the actual operating current of the outdoor unit in the air conditioner, and the control module is further used for sending an adjusting instruction to the frequency conversion module according to the relation between the actual operating current of the outdoor unit and the first limiting current, so that the frequency conversion module adjusts the frequency of the compressor in the air conditioner according to the adjusting instruction.
As shown in fig. 4, the specific system circuit specifically includes: the control module comprises a processor MCU, the outer machine current detection module 20 comprises a power supply circuit and a detection resistor RS connected in series on the power supply circuit, the two ends of the detection resistor RS are electrically connected with the processor MCU, and thus the processor MCU can measure the voltage at the two ends of the detection resistor RS, and the current flowing through the detection resistor RS is calculated. The compressor comprises a compressor motor COMP, the inverter module comprises an inverter IPM1, and the inverter IPM1 is electrically connected with the processor MCU and the compressor motor COMP.
The air conditioner comprises an air conditioner inner unit and an air conditioner outer unit, wherein a processor and a memory are arranged in the air conditioner inner unit. The processor and the memory are in communication connection through a communication bus. And a compressor is arranged in the air conditioner external unit.
The memory stores a program of an inverter control method of an air conditioner, which when executed by the processor implements the inverter control method of an air conditioner as described above.
In summary, the variable frequency control method, system and air conditioner of the air conditioner in the present invention can send a first gear setting instruction to the air conditioner according to the household power consumption condition of the user when the power is insufficient, such as when the power is supplied by a generator, the air conditioner determines a first limiting current corresponding to the first gear setting instruction according to the corresponding relationship between each gear setting instruction and each limiting current, adjusts the frequency of the compressor according to the relationship between the current actual operating current of the external unit and the first limiting current according to different comparison results, and the operating current of the compressor changes while the frequency of the compressor is adjusted, so that the actual operating current of the external unit changes accordingly, and after the frequency of the compressor is adjusted for a period of time, the actual operating current of the external unit is below the maximum limiting current (obtained based on the first limiting current, the value is greater than the first limiting current value), through the restriction to external quick-witted actual operating current to the realization is using the generator to generate electricity when, can appropriate control air conditioner self consumption, makes the user just so can enjoy the air conditioner cooling and can open the electrical apparatus in whole house again, so improves user's living standard, improves the air conditioner rate of utilization.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A frequency conversion control method of an air conditioner is characterized by comprising the following steps:
acquiring a first gear setting instruction, starting a low power consumption mode according to the first gear setting instruction, and determining a first limiting current corresponding to the first gear setting instruction according to the corresponding relation between each gear setting instruction and each limiting current;
acquiring actual operating current of the outdoor unit and the indoor unit of the air conditioner;
and adjusting the frequency of a compressor in the air conditioner according to the relation between the actual operation current of the outdoor unit and the first limiting current.
2. The inverter control method of air conditioner according to claim 1, wherein the first limiting current is set to be I1The actual running current of the external unit is IOutdoor unit practiceThe adjusting the frequency of the compressor in the air conditioner according to the relationship between the actual operation current of the outdoor unit and the first limit current includes:
if aI1≤IOutdoor unit practice＜bI1Increasing the frequency of the compressor by a preset acceleration rate;
wherein a is more than b and less than 1.
3. The inverter control method of an air conditioner according to claim 2, wherein the adjusting of the frequency of the compressor in the air conditioner according to the relationship between the actual operation current of the outdoor unit and the first limit current comprises:
if b is1≤IOutdoor unit practice＜cI1Maintaining the compressor frequency;
wherein b is less than 1 and less than c.
4. The inverter control method of an air conditioner according to claim 2, wherein the adjusting of the frequency of the compressor in the air conditioner according to the relationship between the actual operation current of the outdoor unit and the first limit current comprises:
if cI1≤IOutdoor unit practiceThen the compressor frequency is reduced at a preset reduced speed.
5. The variable frequency control method of an air conditioner according to claim 4, wherein the preset speed increase is 90s/1 Hz; and/or
The preset deceleration is 1s/1 Hz.
6. The inverter control method of an air conditioner according to any one of claims 1 to 5, wherein the gear setting commands include: a first gear instruction, a second gear instruction and a third gear instruction;
the limiting current corresponding to the first gear instruction is greater than the limiting current corresponding to the second gear instruction, and the limiting current corresponding to the second gear instruction is greater than the limiting current corresponding to the third gear instruction;
the first gear setting instruction is any one of the first gear instruction, the second gear instruction and the third gear instruction.
7. The method of claim 4, wherein after the step of adjusting the frequency of the compressor in the air conditioner according to the relationship between the actual operation current of the outdoor unit and the first limiting current, further comprising:
if the frequency of the compressor is lower than the lowest running frequency of the compressor, the actual running current of the outer machine is higher than the cI1And if the maintaining time is longer than the first preset time, the external unit is closed.
8. The inverter control method of claim 7, wherein if the compressor frequency is lower than the compressor minimum operating frequency, the actual operating current of the outer unit is higher than the cI1And the maintaining time is longer than a first preset time, after the step of closing the outdoor unit, the method further comprises:
after the low-gear setting instruction is adjusted to a high-gear setting instruction, the external machine is restarted after the external machine is kept closed for a second preset time;
and the limiting current corresponding to the low gear setting instruction is smaller than the limiting current corresponding to the high gear setting instruction.
9. An inverter control system of an air conditioner, comprising: the control module is respectively and electrically connected with the outer machine current detection module and the frequency conversion module, and the frequency conversion module is electrically connected with the compressor;
wherein the content of the first and second substances,
the control module is used for acquiring a first gear setting instruction, starting a low power consumption mode according to the first gear setting instruction, and determining a first limiting current corresponding to the first gear setting instruction according to the corresponding relation between each gear setting instruction and each limiting current;
the outdoor unit current detection module is used for detecting the actual operating current of an outdoor unit;
the control module is used for acquiring the actual operating current of the outdoor unit in the air conditioner, and the control module is further used for sending an adjusting instruction to the frequency conversion module according to the relation between the actual operating current of the outdoor unit and the first limiting current, so that the frequency conversion module adjusts the frequency of the compressor in the air conditioner according to the adjusting instruction.
10. The air conditioner is characterized by comprising an air conditioner internal unit and an air conditioner external unit, wherein a processor and a memory are arranged in the air conditioner internal unit, the processor and the memory are in communication connection through a communication bus, and a compressor is arranged in the air conditioner external unit;
the memory stores a program of an inverter control method of an air conditioner, which when executed by the processor implements the inverter control method of the air conditioner according to any one of claims 1 to 8.
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