CN113266931B - 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
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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 running current of an external machine in the air conditioner; and adjusting the frequency of the compressor in the air conditioner according to the relation between the actual running current of the external machine and the first limiting current. The invention solves the problems that in the prior art, when the air conditioner is used under the condition of lack of power supply, other electric appliances of the whole house cannot be started, so that the living standard of a user is reduced, and the use rate of the air conditioner in the area of lack of power supply is not high.
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
For some power-starved areas, there may be a phenomenon in which the user uses the generator to generate power. The small-sized generator integrally provides little electric energy for a household power grid, the air conditioner belongs to high-power electric appliances, after the air conditioner is started, the air conditioner power can consume excessive electric energy of the generator, and the residual electric energy of the generator can not meet the requirement that a user starts other household electric appliances.
When the weather is hot and the power supply is lack and the user uses the generator to self-generate, the user opens the air conditioner to enjoy cooling and occupy most of electric energy, so that other electric appliances such as televisions, washing machines and the like in the whole house cannot be opened, the living standard of the user is reduced, and the use rate of the air conditioner in the area with lack of the power supply is low.
Accordingly, the prior art is still in need of improvement and development.
Disclosure of Invention
In view of the shortcomings of the prior art, the invention aims to provide a variable frequency control method and system of an air conditioner and the air conditioner, which solve the problems that in the prior art, when the air conditioner is used under the condition of lack of power supply, other electric appliances in a whole house cannot be started, so that the living standard of a user is reduced, and the use rate of the air conditioner in the area of lack of power supply is not high.
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 running current of an external machine in the air conditioner;
and adjusting the frequency of the compressor in the air conditioner according to the relation between the actual running current of the external machine and the first limiting current.
Further, the first limiting current is set to be I 1 The actual running current of the external machine is I External machine actual The step of adjusting the frequency of the compressor in the air conditioner according to the relation between the actual running current of the external machine and the first limiting current comprises the following steps:
if aI 1 ≤I External machine actual ＜bI 1 Increasing the frequency of the compressor at a preset speed increase;
wherein a < b < 1.
Further, the step of adjusting the frequency of the compressor in the air conditioner according to the relation between the actual operation current of the external machine and the first limiting current includes:
if bI 1 ≤I External machine actual ＜cI 1 Maintaining the compressor frequency;
wherein b is less than 1 and less than c.
Further, the step of adjusting the frequency of the compressor in the air conditioner according to the relation between the actual operation current of the external machine and the first limiting current includes:
if cI 1 ≤I External machine actual And reducing the frequency of the compressor at a preset speed reduction.
Further, the preset speed increasing rate is 90s/1Hz; and/or
The preset speed reduction is 1s/11Hz.
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 larger than the limiting current corresponding to the second gear instruction, and the limiting current corresponding to the second gear instruction is larger 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 relation between the actual running current of the external machine and the first limiting current, the method further comprises:
if the compressor frequency is lower than the lowest operating frequency of the compressor, the actual operating current of the external machine is higher than the cI 1 And if the maintaining time is longer than the first preset time length, the external machine is closed.
Further, the actual operating current of the external machine is higher than the cI if the compressor frequency is lower than the lowest operating frequency of the compressor 1 And the maintaining time is longer than the first preset time length, after the step of closing the external machine, the method further comprises the following steps:
after receiving a command for adjusting the low gear setting command to the high gear setting command, keeping the external machine closed for a second preset time period, and restarting the external machine;
the limiting current corresponding to the low gear setting instruction is smaller than the limiting current corresponding to the high gear setting instruction.
A variable frequency control system of an air conditioner, comprising: the control module is electrically connected with the outer current detection module and the frequency conversion module respectively, and the frequency conversion module is electrically connected with the compressor;
wherein,,
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 external machine current detection module is used for detecting the actual running current of the external machine;
the control module is used for acquiring the actual running current of the external machine in the air conditioner, and sending an adjusting instruction to the frequency conversion module according to the relation between the actual running current of the external machine 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.
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, 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 a frequency conversion control method of the air conditioner, and the program of the frequency conversion control method of the air conditioner realizes the frequency conversion control method of the air conditioner when being executed by the processor.
The beneficial effects are that: according to the variable frequency control method and system for the air conditioner and the air conditioner, when electric energy is lacking, such as when a generator is used for supplying power, a first gear setting instruction can be sent to the air conditioner in combination with the household power consumption 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 the compressor is adjusted according to the relation between the actual operating current of the current external machine and the first limiting current, the compressor frequency is adjusted, the operating current of the compressor is changed along with the adjustment, so that the actual operating current of the external machine is changed along with the adjustment of the compressor frequency, the actual operating current of the external machine is below the maximum limiting current (obtained based on the first limiting current value), and the limitation of the actual operating current of the external machine is achieved, so that the power consumption of the air conditioner can be properly controlled when the generator is used for self-power generation, the user can enjoy the cooling of the air conditioner, the user can enjoy the cooling efficiency, the full-use air conditioner level can be improved, and the air conditioner life level can be improved.
Drawings
Fig. 1 is a flowchart of an embodiment of a variable frequency control method of an air conditioner according to the present invention.
Fig. 2 is a flowchart of a frequency conversion control method of an air conditioner according to a preferred embodiment of the present invention.
Fig. 3 is a schematic block diagram of a frequency conversion control system of an air conditioner according to the present invention.
Fig. 4 is a circuit diagram of a variable frequency control system of an air conditioner according to the present invention.
In the figure: 10. an external 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 more clear and clear, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The main differences of the existing variable frequency air conditioner and the common air conditioner or the fixed rotating speed air conditioner are that: the frequency converter is added in the variable frequency air conditioner. The processor of the variable frequency air conditioner collects the related information of the indoor environment at any time and compares the information with the internal set value, and outputs a control signal through operation processing. For example: the working principle of the AC variable frequency air conditioner is that the power frequency AC is converted into 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 approximates to sine wave) so that the rotation speed of the compressor motor changes correspondingly with the change of the power frequency. Different from the fixed-frequency air conditioner, the variable-frequency air conditioner can generally adjust the temperature in the space more accurately through an intelligent chip according to the change of the indoor temperature. In the whole monitoring process, the compressor cannot stop running, but the running speed of the compressor can be adjusted according to temperature change, so that the temperature of the whole space can be kept constant. Because the compressor of the variable frequency air conditioner can not be turned on and off normally, the high power consumption caused by continuously turning on and off 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 operate at a lower frequency to maintain the indoor set temperature. Therefore, the power consumption of the variable frequency air conditioner is small, and the power of the variable frequency air conditioner can be saved by more than 30% compared with a fixed frequency air conditioner. Meanwhile, the low-speed operation reduces the loss of the variable frequency air conditioner and prolongs the service life of the variable frequency air conditioner.
The relation between the operating frequency of the motor of the compressor controlled by the frequency converter (hereinafter, the compressor frequency is all described for convenience) and the current is determined according to the characteristics of the motor, for example, when the frequency in the constant torque motor is reduced, in the motor with the proportional decreasing torque: the current and frequency are reduced in a direct proportional relationship (1:1 ratio). In a motor with a decreasing torque to the power of 1.5, the current decreases to the power of 1.5 with decreasing frequency. In a motor with a square-decreasing torque, the current decreases to the power of 2 with decreasing frequency. In a three-sided decreasing torque motor, the current decreases 3-sided with decreasing frequency.
Thus, varying the compressor frequency can vary the current required for the motor operation of the compressor. Thus, when the compressor frequency is changed, the current required by the external machine of the air conditioner is changed, and thus the current of the whole air conditioner is changed. In the case of constant voltage, according to p=ui. The power of the air conditioner is changed and the power consumed during a period of time is changed.
Accordingly, the present embodiment provides a variable frequency 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 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 indoor unit. The user triggers the first gear setting instruction, the first gear setting instruction is one of all gear buttons with the low power consumption mode function, the air conditioner receives the first gear setting instruction, and the low power consumption mode is executed according to the first gear setting instruction. That is, when the air conditioner executes the low power mode according to one of the gear buttons, the air conditioner enters the low power mode according to one of the gear buttons (e.g., the first gear setting command) only if the gear buttons have the low power mode function.
For convenience of explanation of the present application, taking one gear as an example, that is, a first gear setting instruction is taken as one of any gears (all having a low power consumption mode function) set on the remote controller, a frequency conversion control method of the air conditioner is explained as follows:
the remote controller sends a first gear setting instruction to the air conditioner, the processor of the air conditioner indoor unit receives the first gear setting instruction, and the processor finds out 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 then sends a control instruction to control the air conditioner indoor unit by the communication system after determining the first limiting current. And setting the first limiting current, and obtaining a maximum limiting current corresponding to the first limiting current according to a preset relation, wherein if the value of the maximum limiting current is obtained by multiplying the value of the first limiting current by a coefficient, the coefficient is larger than 1, and the maximum limiting current is larger than the value of the first limiting current. When the external power supply is insufficient, the operation current of the outdoor unit of the air conditioner is limited according to the maximum limiting current. It should be noted that, in the low power mode, the maximum limiting current of the gear is smaller than the normal current value used by the external air conditioner under the same condition when the power supply is sufficient in the normal power supply mode. In a normal power supply mode (normal mains supply), when a user triggers the gear key (with a low power consumption mode function), the air conditioner runs with low power consumption, and the energy-saving effect is achieved. Under the condition of insufficient power supply (power supply of a generator), when a user triggers the gear key (with a low power consumption mode function), the air conditioner runs with low power consumption, and the air conditioner function can still be realized under the condition of insufficient electric energy.
And step 200, acquiring the actual running current of the external machine in the air conditioner.
Specifically, the actual running current of the external machine is the current value of the external machine of the air conditioner when the air conditioner runs. The main power supply circuit of the external machine is provided with a detection resistor, the voltage on the detection resistor is measured, the actual running current of the external machine can be obtained, and the processor of the air conditioner monitors the actual running current of the external machine in real time.
And step S300, adjusting the frequency of the compressor in the air conditioner according to the relation between the actual running current of the external machine and the first limiting current.
The method comprises the following steps: and the processor makes corresponding judgment according to the relation between the actual running current of the external machine and the first limiting current acquired in real time. When the actual operation current of the external machine is greater than the maximum limit current value (the value obtained by multiplying the first limit current value by a coefficient which is greater than 1), the actual operation current value is excessively high, which results in larger power of the whole air conditioner, so that the processor controls the frequency converter to adjust the power of the compressor, and the current operation current of the external machine after adjusting the frequency of the compressor is lower than the maximum limit current. The current running current of the external machine and the actual running current of the external machine are current values of the external machine at different moments at the same position of a power supply circuit of the external machine.
It is easy to think that in the above steps, the gear button may be provided not only on the remote controller but also on the air conditioning indoor unit. The gear setting instruction can be set by long-pressing the existing keys on the remote controller, such as long-pressing different wind 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 lack, for example, when the generator is used for supplying power, the user can trigger a gear button (with a low power consumption mode function) in combination with the household electricity consumption condition of the user, the remote controller sends a first gear setting instruction to the air conditioner, the air conditioner enters the 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 relation between each gear setting instruction and each limiting current, the frequency of the compressor is adjusted according to the relation between the actual operating current of the current external machine and the first limiting current, the frequency of the compressor is also changed along with the adjustment, so that the actual operating current of the external machine is also changed along with the adjustment of the frequency of the compressor, the actual operating current of the external machine is located at a value below the maximum limiting current (the value obtained by multiplying the first limiting current value by a coefficient, and the coefficient is greater than 1), the air conditioner can properly control the self-generating electricity of the generator when the generator is used, and the user can enjoy the air conditioner can also enjoy the full-cooling power consumption of the air conditioner, and the user can also enjoy the air conditioner.
In this embodiment, if the utility power is normally supplied and the electric energy is sufficient, the above-mentioned gear key (gear case with low power consumption mode function) does not need to be triggered, and the air conditioner is normally operated, and if the above-mentioned gear key is triggered, the air conditioner will enter the low power consumption mode and operate under the maximum limiting current limited by the gear key, thereby having the energy-saving effect. When the power is required to be supplied by the generator after power failure, if the air conditioner is started normally, the electricity generated by the generator may not be enough for the air conditioner to be started normally, and at the moment, the user triggers the gear key, the air conditioner enters a low power consumption mode and operates under the maximum limiting current limited by the gear key, so that the air conditioner can be started and operated.
In a specific implementation process, as shown in fig. 2, the detailed steps include:
step S110, 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.
Step S120, multiplying the value of the first limiting current by different coefficients, calculating to obtain different adjustment values, and dividing a plurality of adjustment intervals according to the different adjustment values.
The method comprises the following steps: the processor of the indoor unit of the air conditioner receives the first gear setting instruction and then the communication system sends a control instruction to the outdoor unit of the air conditioner. 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. The processor calculates and multiplies the first limiting current value by different coefficients to respectively obtain a first adjustment value, a second adjustment value and a third adjustment value. The first adjustment value is the maximum (corresponding coefficient is greater than 1), so that the first adjustment value is also the maximum limiting current, and the current of the air conditioner outdoor unit is limited according to the first adjustment value, so that the actual running current of the air conditioner outdoor unit after adjustment is smaller than the first adjustment value (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 fact that the actual current value of the external machine is located in the different adjustment intervals is detected, corresponding adjustment is performed.
In the present embodiment, the first limiting current is I 1 The actual running current of the external machine is I External machine actual . The first adjustment value is the first limiting current value multiplied by c, i.e. the first adjustment value is cI 1 Where 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 bI 1 Where b is a constant less than 1, such as b is specifically 59/64. The third adjustment value isThe first limiting current value is multiplied by a, i.e. the third adjustment value is aI 1 . Where a is a constant less than b, and a is specifically 54/64. So that the gear setting instruction is divided into different adjusting sections according to different adjusting values, and when the air conditioner detects the actual running current value of the external machine, the air conditioner is controlled according to I External machine actual And in the corresponding adjustment interval, and controlling the compressor to perform corresponding adjustment.
And step S210, acquiring the actual running current of the external machine in the air conditioner.
Step S310, if aI 1 ≤I External machine actual ＜bI 1 Increasing the frequency of the compressor at a preset speed increase; wherein a < b < 1.
Specifically, when aI is detected 1 ≤I External machine actual ＜bI 1 When the operation frequency of the compressor is increased, the current of the motor of the corresponding compressor is increased, so that the current of the external machine of the whole air conditioner is increased, and the current operation current of the external machine after the adjustment of the compressor frequency is positioned at a second adjustment value (bI) 1 ) And a first adjustment value (cI) 1 ) And stopping the adjustment when the current value is a certain value. So that the compressor operates at a stable frequency. The frequency of the compressor adopts a gradual rising mode, for example, the preset speed increasing rate is 90s/1Hz, namely, 90s rises to 1Hz. Therefore, the compressor can be stably operated, noise is not generated, and the use comfort of the air conditioner is improved.
Step S320, if bI 1 ≤I External machine actual ＜cI 1 The compressor frequency is maintained, where b < 1 < c.
The method comprises the following steps: if a if bI is detected 1 ≤I External machine actual ＜cI 1 And when the current running current of the external machine is in a stable interval below the first adjustment value, maintaining the frequency of the compressor.
Step S330, if cI 1 ≤I External machine actual And reducing the frequency of the compressor at a preset speed reduction.
Specifically, if a number cI is detected 1 ≤I External machine actual When the speed of the compressor is reduced according to the preset speed reductionWhen the compressor operating frequency is decreased, the current of the motor of the corresponding compressor is decreased, so that the current of the external machine of the whole air conditioner is decreased, and the current operating current of the external machine after the compressor frequency is adjusted is at a second adjustment value (bI 1 ) And a first adjustment value (cI) 1 ) And stopping the adjustment when the current value is a certain value. So that the compressor operates at a stable frequency. If the preset speed is 1s/1Hz, namely 1s is reduced by 1Hz.
In the above step, if only one gear is used, the current is adjusted according to the actual operating current and the first adjustment value (cI 1 ) And a second adjustment value (bI 1 ) The compressor frequency is adjusted so that the actual operating current of the external machine after the compressor frequency is adjusted is at a first adjustment value (cI) 1 ) And a second adjustment value (bI 1 ) In a stable interval therebetween. In this embodiment, the third adjustment value (aI 1 ) The range in which each gear is adjusted can be distinguished. When the actual running current of the external machine is at the second adjustment value (bI 1 ) In the following, although a large amount of electric energy is consumed by performing an appropriate current boost, the consumed electric energy value can be maintained at the first adjustment value (cI 1 ) And a second adjustment value (bI 1 ) In addition, the air conditioner can stably run, and the service life of the air conditioner is prolonged.
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 I 1 The corresponding limiting current in the second gear instruction is I 2 The corresponding limiting current in the third gear instruction is I 3 . And I 1 Less than I 2 ；I 2 Less than I 3 The method comprises the steps of carrying out a first treatment on the surface of the First adjustment value (c) in first-gear instruction 1 I 1 ) Less than or equal to the third adjustment value (a 2 I 2 ) First adjustment value (c) in second gear instruction 2 I 2 ) Less than or equal to the third adjustment value (a 3 I 3 ). For example, I in the first-gear instruction in this embodiment 1 In particular 2A, second gear instructionI of (2) 2 Specifically 5A, I in the third gear instruction 3 Specifically 7A.
The steps S110, S120, S210, S310, S320, and S320 are control procedures of the first gear instruction among the gear setting instructions. The first gear command, the second gear command and the third gear command can respectively realize the control process. The method 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 first gear instruction; multiplying the value of the limiting current by different coefficients, calculating to obtain different adjustment values, and dividing a plurality of adjustment intervals according to the different adjustment values; acquiring actual running current of an external machine in the air conditioner; if a is 1 I 1 ≤I External machine actual ＜b 1 I 1 Increasing the frequency of the compressor at a preset speed increase; wherein a is 1 ＜b 1 < 1; if b 1 I 1 ≤I External machine actual ＜c 1 I 1 Maintaining the compressor frequency, wherein b 1 ＜1＜c 1 The method comprises the steps of carrying out a first treatment on the surface of the If c 1 I 1 ≤I External machine actual And reducing the frequency of the compressor at a preset speed reduction.
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 setting instruction 2 ) The method comprises the steps of carrying out a first treatment on the surface of the Multiplying the value of the limiting current by different coefficients, calculating to obtain different adjustment values, and dividing a plurality of adjustment intervals according to the different adjustment values; acquiring actual running current of an external machine in the air conditioner; if a is 2 I 2 ≤I External machine actual ＜b 2 I 2 Increasing the frequency of the compressor at a preset speed increase; wherein a is 2 ＜b 2 < 1; if b 2 I 2 ≤I External machine actual ＜c 2 I 2 Maintaining the compressor frequency, wherein b 2 ＜1＜c 2 The method comprises the steps of carrying out a first treatment on the surface of the If c 2 I 2 ≤I External machine actual And reducing the frequency of the compressor at a preset speed reduction.
When the first gear setting instruction is a third gear instruction, the steps are as follows: acquiring a third gear setting instruction, and determining a limiting current (I) corresponding to the third gear setting instruction 3 ) The method comprises the steps of carrying out a first treatment on the surface of the Multiplying the value of the limiting current by different coefficients, calculating to obtain different adjustment values, and dividing a plurality of adjustment intervals according to the different adjustment values; acquiring actual running current of an external machine in the air conditioner; if a is 3 I 3 ≤I External machine actual ＜b 3 I 3 Increasing the frequency of the compressor at a preset speed increase; wherein a is 3 ＜b 3 < 1; if b 3 I 3 ≤I External machine actual ＜c 3 I 3 Maintaining the compressor frequency, wherein b 3 ＜1＜c 3 The method comprises the steps of carrying out a first treatment on the surface of the If c 3 I 3 ≤I External machine actual And reducing the frequency of the compressor at a preset speed reduction.
The above a is that 1 、a 2 、a 3 The values of a may be the same or different, provided that the aforementioned selection requirements are met, according to embodiments of the present invention, a 1 、a 2 、a 3 The values of (2) are the same. B above 1 、b 2 、b 3 The values of b may be the same or different, provided that the aforementioned selection requirements are met, according to a specific embodiment of the invention 1 、b 2 、b 3 The values of (2) are the same. C above 1 、c 2 、c 3 The values of c may be the same or different, provided that the aforementioned selection requirements are met, according to a specific embodiment of the invention 1 、c 2 、c 3 The values of (2) are the same.
The steps also include: and a control step of receiving a gear canceling instruction, and canceling the first gear setting instruction when the air conditioner receives the gear canceling instruction. Thus, the air conditioner enters a normal use mode, and in the normal use mode, the limitation of the maximum limiting current (the first limiting current is multiplied by a coefficient larger than 1) is canceled, and the air conditioner operates normally.
In the above process, the air conditioner has the limit of the lowest operating frequency when in use, namely, the compressor can normally work only by adopting the frequency higher than the lowest operating 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 compressor frequency is lower than the lowest operation frequency of the compressor, the actual operation current of the external machine is higher than cI 1 And if the maintaining time is longer than the first preset time length, the external machine is closed.
Specifically, when the actual running current of the external machine is greater than or equal to cI 1 And when the operation frequency of the compressor is reduced according to the preset speed reduction, detecting whether the operation frequency of the compressor reaches the lowest operation frequency of the air conditioner. If the lowest operating frequency of the air conditioner is not reached, the actual operating current of the external machine is reduced to cI 1 The following is given. If the lowest operating frequency of the air conditioner is reached, the actual operating current of the external machine is still higher than cI 1 At this time, the operating frequency of the compressor is no longer reduced, and the compressor is detected to be in a continuous first preset time (such as 2 minutes) when the actual operating current of the external machine is higher than cI 1 At this time, the air conditioner external unit is turned off. The air conditioner is protected.
And S500, after receiving the instruction for setting the low gear to be adjusted to the high gear by the instruction for setting the low gear, restarting the external machine after maintaining the external machine to be closed for a second preset time.
Specifically, when the air conditioner reaches the lowest running frequency of the air conditioner and the actual running current of the external machine 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 second gear instruction are changed into the third gear instruction after the external machine is stopped. Then the air conditioner is restarted after being controlled to stop for a second preset time (such as 2 minutes). Therefore, when the variable frequency control is performed on the air conditioner, the power consumption of the air conditioner is reduced, and the compressor of the air conditioner is protected. Namely, the first gear instruction and the second gear instruction are low gear setting instructions relative to the third gear instruction; the first gear instruction is a low gear setting instruction with respect to the second gear instruction.
As shown in fig. 3, the present solution further provides a variable frequency control system of an air conditioner, including: the control module 10, the external current detection module 20, the frequency conversion module 30 and the compressor 40; the control module 10 is electrically connected with the external current detection module 20 and the frequency conversion module 30 respectively, and the frequency conversion module 30 is electrically connected with the compressor 40;
wherein,,
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 external machine current detection module is used for detecting the actual running current of the external machine;
the control module is used for acquiring the actual running current of the external machine in the air conditioner, and sending an adjusting instruction to the frequency conversion module according to the relation between the actual running current of the external machine and the first limiting current so that the frequency conversion module can adjust the frequency of the compressor in the air conditioner according to the adjusting instruction.
As shown in fig. 4, the specific system circuit is as follows: the control module comprises a processor MCU, the external current detection module 20 comprises a power supply circuit and a detection resistor RS connected in series on the power supply circuit, and two ends of the detection resistor RS are electrically connected with the processor MCU, so that the processor MCU can measure voltages at two ends of the detection resistor RS, and accordingly current flowing through the detection resistor RS is calculated. The compressor comprises a compressor motor COMP, the frequency conversion module comprises a frequency converter IPM1, and the frequency converter IPM1 is electrically connected with the processor MCU and the compressor motor COMP.
The scheme also comprises an air conditioner, wherein the air conditioner comprises an air conditioner inner unit and an air conditioner outer unit, and 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. The air conditioner external unit is provided with a compressor.
The memory stores a program of a frequency conversion control method of the air conditioner, and the program of the frequency conversion control method of the air conditioner realizes the frequency conversion control method of the air conditioner when being executed by the processor.
In summary, according to the variable frequency control method and system for an air conditioner and the air conditioner in the invention, when electric energy is lack, for example, when a generator is used for supplying power, a first gear setting instruction can be sent to the air conditioner in combination with the household electricity consumption condition of a user, 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, and adjusts the frequency of a compressor according to the relation between the actual running current of a current external machine and the first limiting current, and the running current of the compressor is changed along with the adjustment of the frequency of the compressor, so that the actual running current of the external machine is located below the maximum limiting current (obtained based on the first limiting current value) after the adjustment of the frequency of the compressor for a period of time, and the power consumption of the air conditioner can be properly controlled when the generator is used for self-generating electricity, so that the user can enjoy cooling and simultaneously, the full-house electrical appliance can be started, and the use rate of the air conditioner can be improved.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the 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 scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. The frequency conversion control method of the 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 running current of an external machine in the air conditioner;
according to the relation between the actual running current of the external machine and the first limiting current, adjusting the frequency of a compressor in the air conditioner; setting the first limiting current to be I 1 The actual running current of the external machine is I External machine actual The step of adjusting the frequency of the compressor in the air conditioner according to the relation between the actual running current of the external machine and the first limiting current comprises the following steps:
if aI 1 ≤I External machine actual ＜bI 1 Increasing the frequency of the compressor at a preset speed increase;
wherein a is less than b is less than 1;
if bI 1 ≤I External machine actual ＜cI 1 Maintaining the compressor frequency;
wherein b is more than 1 and less than c;
if cI 1 ≤I External machine actual And reducing the frequency of the compressor at a preset speed reduction.
2. The variable frequency control method of an air conditioner according to claim 1, wherein the preset speed increase is 90s/1Hz;
and/or the preset deceleration is 1s/1Hz.
3. The variable frequency control method of an air conditioner according to any one of claims 1 to 2, wherein 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 larger than the limiting current corresponding to the second gear instruction, and the limiting current corresponding to the second gear instruction is larger 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.
4. The variable frequency control method of an air conditioner according to claim 1, wherein after the step of adjusting the frequency of a compressor in the air conditioner according to a relation between an actual operation current of the external machine and the first limit current, further comprising:
if the compressor frequency is lower than the lowest compressor operating frequency, the actual operating current of the external machine is higher than the cI 1 And if the maintaining time is longer than the first preset time length, the external machine is closed.
5. The variable frequency control method of an air conditioner as set forth in claim 4, wherein said actual operation current of said external machine is higher than said cI if said compressor frequency is lower than said lowest operation frequency of said compressor 1 And the maintaining time is longer than the first preset time length, after the step of closing the external machine, the method further comprises the following steps:
after receiving a command for adjusting the low gear setting command to the high gear setting command, keeping the external machine closed for a second preset time period, and restarting the external machine;
the limiting current corresponding to the low gear setting instruction is smaller than the limiting current corresponding to the high gear setting instruction.
6. A variable frequency control system of an air conditioner, comprising: the control module is electrically connected with the outer current detection module and the frequency conversion module respectively, and the frequency conversion module is electrically connected with the compressor;
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 external machine current detection module is used for detecting the actual running current of the external machine;
the control module is used for acquiring the actual running current of the external machine in the air conditioner, and sending an adjusting instruction to the frequency conversion module according to the relation between the actual running current of the external machine and the first limiting current so as to enable the frequency conversion to be carried outThe module adjusts the frequency of a compressor in the air conditioner according to the adjusting instruction; setting the first limiting current to be I 1 The actual running current of the external machine is I External machine actual The step of adjusting the frequency of the compressor in the air conditioner according to the relation between the actual running current of the external machine and the first limiting current comprises the following steps:
if aI 1 ≤I External machine actual ＜bI 1 Increasing the frequency of the compressor at a preset speed increase;
wherein a is less than b is less than 1;
if bI 1 ≤I External machine actual ＜cI 1 Maintaining the compressor frequency;
wherein b is more than 1 and less than c;
if cI 1 ≤I External machine actual And reducing the frequency of the compressor at a preset speed reduction.
7. The air conditioner is characterized by comprising 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 outer unit;
the memory stores a program of a frequency conversion control method of an air conditioner, which when executed by the processor, implements the frequency conversion control method of an air conditioner according to any one of claims 1 to 5.
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| CN114216217B (en) * | 2021-12-02 | 2023-08-15 | 青岛海尔空调器有限总公司 | Method and device for adjusting power supply of air conditioner and air conditioner |
| CN114844157A (en) * | 2022-05-16 | 2022-08-02 | 深圳前海云充科技有限公司 | Method and device for adjusting output power, terminal equipment and storage medium |
| CN115235087A (en) * | 2022-06-30 | 2022-10-25 | 青岛海尔空调器有限总公司 | Control method of air conditioning system |
| CN117450638A (en) * | 2022-07-19 | 2024-01-26 | 广东美的制冷设备有限公司 | Air conditioner and its control method, device and storage medium, electronic equipment |
| CN115800488A (en) * | 2022-11-23 | 2023-03-14 | 青岛海尔空调器有限总公司 | Frequency conversion control method and device of air conditioner and air conditioner |
| CN116241978B (en) * | 2023-04-17 | 2025-09-02 | 宁波奥克斯电气有限公司 | Air conditioner, control method, device and readable storage medium thereof |
| CN119533019B (en) * | 2023-08-30 | 2025-12-02 | 佛山市顺德区美的电子科技有限公司 | Compressor operation control methods, devices, air conditioning equipment and storage media |
| CN119713490A (en) * | 2023-09-26 | 2025-03-28 | 青岛海尔智慧楼宇科技有限公司 | Current limiting operation control method and control device of air conditioner and air conditioner |
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