CN110953698B - Frequency carrier frequency control method of variable frequency air conditioner and variable frequency air conditioner - Google Patents
Frequency carrier frequency control method of variable frequency air conditioner and variable frequency air conditioner Download PDFInfo
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- CN110953698B CN110953698B CN201811122302.0A CN201811122302A CN110953698B CN 110953698 B CN110953698 B CN 110953698B CN 201811122302 A CN201811122302 A CN 201811122302A CN 110953698 B CN110953698 B CN 110953698B
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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
- F24F11/64—Electronic processing using pre-stored data
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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
- F24F11/56—Remote control
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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
Abstract
The invention provides a carrier frequency control method of a variable frequency air conditioner and the variable frequency air conditioner, wherein the carrier frequency control method comprises the following steps: s10, acquiring the set temperature of the remote controller of the variable frequency air conditioner and the indoor environment temperature; s20, judging whether the difference value between the set temperature of the remote controller and the indoor environment temperature is larger than or equal to the preset temperature difference, if so, executing S50, otherwise, executing S30; s30, acquiring the temperature of an indoor unit coil and the temperature of an outdoor unit coil of the variable frequency air conditioner; s40, judging whether the ratio of the temperature of the coil pipe of the indoor unit to the temperature of the coil pipe of the outdoor unit is larger than or equal to a preset proportionality coefficient, if so, executing S50, and if not, executing S60; s50, controlling the variable frequency air conditioner to operate at a first carrier frequency; and S60, controlling the variable frequency air conditioner to operate at the second carrier frequency. According to the invention, through carrier frequency adjustment, high carrier frequency operation is adopted when the air conditioner is in high load, and low carrier frequency operation is adopted when the air conditioner is in low load, so that the operation efficiency of the variable frequency air conditioner is improved, and the energy-saving effect is realized.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a carrier frequency control method of a variable frequency air conditioner and the variable frequency air conditioner adopting the control method.
Background
In the air conditioning system, the weight ratio of each working condition is approximately 55%, the weight ratio of the heating working condition is approximately 45%, the weight ratio of each working condition is subdivided, and the rated cooling is 23.4%, the intermediate cooling is 32.1%, the rated heating is 18.1%, the intermediate heating is 15.6%, and the low-temperature heating is 10.8%. The energy efficiency ratio of the intermediate refrigeration working condition is the largest, and the working condition is the working condition which is focused on in the system development and matching stage.
At present, for the variable frequency air conditioner, the conventional efficiency improving means for performance debugging comprises the following steps:
debugging the system: the whole performance of a single point is improved by changing throttling or adjusting the refrigerant quantity, but the performance of other working condition points of refrigeration is influenced by changing a capillary tube or changing the refrigerant quantity, so that the mode is greatly limited.
And (3) whole machine shunting adjustment: the energy efficiency of the whole machine is improved by adjusting the shunting effect of the inner machine and the outer machine, but different shunting is possibly beneficial to refrigeration but ineffective or has adverse effect on other working condition points, so the method is still in the research stage at present.
Electric control adjustment: the increase of the electric control cost is little compared with the increase of the whole machine, and has certain effect, thereby becoming the key research field of domestic air conditioner manufacturers.
It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present invention and therefore may include information that does not constitute prior art known to a person of ordinary skill in the art.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a carrier frequency control method of a variable frequency air conditioner and the variable frequency air conditioner, which can effectively improve the overall energy efficiency of the variable frequency air conditioner and overcome the problem that the overall energy efficiency improvement and the power consumption saving cannot be considered at the same time.
According to one aspect of the invention, a method for controlling carrier frequency of a variable frequency air conditioner is provided, which comprises the following steps: s10, acquiring the set temperature of the remote controller of the variable frequency air conditioner and the indoor environment temperature; s20, judging whether the difference value between the set temperature of the remote controller and the indoor environment temperature is larger than or equal to a preset temperature difference, if so, executing S50, and if not, executing S30; s30, acquiring the temperature of an indoor unit coil and the temperature of an outdoor unit coil of the variable frequency air conditioner; s40, judging whether the ratio of the indoor unit coil temperature to the outdoor unit coil temperature is larger than or equal to a preset proportionality coefficient, if so, executing S50, and if not, executing S60; s50, controlling the variable frequency air conditioner to operate at a first carrier frequency; and S60, controlling the variable frequency air conditioner to operate at a second carrier frequency.
Preferably, in the carrier frequency control method, the first carrier frequency is greater than the second carrier frequency.
Preferably, in the carrier frequency control method, the first carrier frequency ranges from 5KHZ to 6.5KHZ, and the second carrier frequency ranges from 3KHZ to 5 KHZ.
Preferably, in the carrier frequency control method, the preset temperature difference is less than or equal to 2 ℃.
Preferably, in the carrier frequency control method, between the step S40 and the step S50, the method further includes: s405, judging whether the duration time of the ratio is greater than or equal to the preset proportional coefficient reaches a first stable time, and if so, executing S50.
Preferably, in the carrier frequency control method, between the step S40 and the step S60, the method further includes: s406, judging whether the duration time of the ratio smaller than the preset proportionality coefficient reaches a second stable time, if so, executing S60.
Preferably, in the above carrier frequency control method, the variable frequency air conditioner includes a cooling condition and a heating condition; under the refrigeration working condition, the difference value is obtained by subtracting the set temperature of the remote controller from the indoor environment temperature, and the ratio is obtained by dividing the outdoor unit coil temperature by the indoor unit coil temperature; under the heating working condition, the difference value is obtained by subtracting the indoor environment temperature from the temperature set by the remote controller, and the ratio value is obtained by dividing the coil temperature of the indoor unit by the coil temperature of the outdoor unit.
Preferably, in the carrier frequency control method, a ratio of the outdoor unit coil temperature divided by the indoor unit coil temperature is measured under an intermediate refrigeration condition, and is used as a preset proportionality coefficient under the refrigeration condition; and measuring the ratio of the temperature of the coil pipe of the indoor unit to the temperature of the coil pipe of the outdoor unit under the intermediate heating working condition, and taking the ratio as a preset proportionality coefficient under the heating working condition.
Preferably, in the carrier frequency control method, the indoor ambient temperature is obtained by an indoor temperature sensor of the inverter air conditioner, the indoor unit coil temperature is obtained by an indoor coil temperature sensor of the inverter air conditioner, and the outdoor unit coil temperature is obtained by an outdoor coil temperature sensor of the inverter air conditioner.
According to another aspect of the invention, an inverter air conditioner is provided, and the inverter air conditioner adopts the carrier frequency control method for carrier frequency control.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the set temperature of the remote controller of the variable frequency air conditioner, the indoor environment temperature, the temperature of the coil pipe of the indoor unit, the temperature of the coil pipe of the outdoor unit and other parameters are monitored, so that the variable frequency air conditioner can operate at a high carrier frequency under a high load and operate at a low carrier frequency under a low load, the overall efficiency of the air conditioner is improved, and the energy-saving effect is achieved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a schematic flow chart illustrating a carrier frequency control method of an inverter air conditioner according to an embodiment of the present invention;
fig. 2 is a schematic flow chart illustrating a process of controlling the variable frequency air conditioner to operate at a first carrier frequency according to a ratio of an indoor unit coil temperature to an outdoor unit coil temperature being greater than or equal to a preset proportionality coefficient in the embodiment;
fig. 3 is a schematic flow chart illustrating a process of controlling the inverter air conditioner to operate at the second carrier frequency according to that a ratio of the indoor unit coil temperature to the outdoor unit coil temperature is smaller than a preset proportionality coefficient in the embodiment.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted.
The carrier frequency, also called switching frequency in frequency conversion control, is determined by the number of times the inverter switching devices in the frequency conversion controller are turned on and off. The higher the carrier frequency, the more the number of times of on-off of the switching device is, the more the power consumption of the control device is increased, but the sine stability of the output of the current waveform is strengthened and the interference of the second harmonic is less. At the moment, the system stability is strong, and the noise is low. The lower the carrier frequency, the lower the number of times of starting and stopping of the switch device is shown, the power consumption of the control device is reduced, the energy efficiency of the whole machine is improved, and the energy-saving effect is achieved.
For the variable frequency air conditioner, the higher the rotating speed, the larger the system load, the lower the running stability, and the higher the system noise relative to the lower rotating speed. Therefore, if high carrier frequency auxiliary control is adopted in the process of high rotating speed and high load, the output of current can be stabilized, and the noise of the system is improved to a certain extent. When the frequency conversion air conditioner runs at a low rotating speed, the system load is not large under the conventional condition, and the stability and the noise condition of the system are better. Therefore, low carrier frequency control can be adopted when the rotating speed is low, the power consumption of a control device at the stage is reduced, the operating efficiency of the whole machine is improved, and a certain energy-saving effect is achieved.
Specifically, in this embodiment, a scheme for controlling the inverter air conditioner to operate at a high carrier frequency under a high load and operate at a low carrier frequency under a low load is shown with reference to fig. 1, and includes the following steps:
s10, acquiring the set temperature of the remote controller of the variable frequency air conditioner and the indoor environment temperature; s20, judging whether the difference value between the set temperature of the remote controller and the indoor environment temperature is larger than or equal to a preset temperature difference, if so, executing S50; and S50, controlling the inverter air conditioner to operate at the first carrier frequency.
Wherein, the indoor ambient temperature is monitored by an indoor temperature sensor. When the difference (recorded as D) between the set temperature (recorded as T1) of the variable-frequency remote controller and the indoor environment temperature (recorded as T2) is greater than or equal to the preset temperature difference, the air conditioning system is indicated to be in a high load, and high-speed operation is required to enable the indoor environment temperature T2 to be close to the set temperature T1 of the remote controller. Specifically, under the cooling condition, the difference D is a value obtained by subtracting the set temperature T1 from the indoor ambient temperature T2, that is, the difference D is T2 to T1 under the cooling condition. Under the heating working condition, the difference value D is obtained by subtracting the indoor environment temperature T2 from the remote controller set temperature T1, namely the heating working condition difference value D is T1-T2.
In a preferred embodiment, the predetermined temperature difference is 2 ℃ or less, and is most preferably 2 ℃. That is, when the difference D is 2 ℃ or more, the air conditioner needs to be operated at a high speed to realize cooling/heating. And controlling the variable frequency air conditioner to operate at a first carrier frequency, wherein the first carrier frequency is a high carrier frequency of the variable frequency air conditioner, and the value range is 5 KHZ-6.5 KHZ, for example.
In a specific application scenario, for example, when the indoor temperature sensor monitors that the current indoor temperature T2 is 30 ℃, and the temperature T1 set by the remote controller is 16 ℃, the difference between T2 and T1 is much greater than the preset temperature difference of 2 ℃, and at this time, the variable frequency air conditioner inevitably operates at a high rotation speed to perform refrigeration, so that the variable frequency air conditioner is controlled to operate at a first carrier frequency (high carrier frequency) to improve the operation efficiency. With the continuous refrigeration of the air conditioner, when the indoor temperature reaches or approaches 16 ℃ and the heat preservation of the room is good, the air conditioning system can reduce the running rotating speed, and the variable frequency air conditioner can be controlled to run at low carrier frequency because the load of the air conditioning system is not large at the moment so as to save the power consumption of the system.
Further, before controlling the inverter air conditioner to operate at a low carrier frequency, that is, when the difference D between the remote controller set temperature T1 and the indoor environment temperature T2 is less than the preset temperature difference, the method further includes the following judgment condition:
s30, acquiring the temperature of an indoor unit coil and the temperature of an outdoor unit coil of the variable frequency air conditioner; s40, judging whether the ratio of the temperature of the coil pipe of the indoor unit to the temperature of the coil pipe of the outdoor unit is larger than or equal to a preset proportionality coefficient, if so, executing S50, and if not, executing S60; s50, controlling the variable frequency air conditioner to operate at a first carrier frequency; and S60, controlling the variable frequency air conditioner to operate at the second carrier frequency.
As described above, the variable frequency air conditioner adopts a high carrier frequency to stably output and reduce noise when in a high load, and adopts a low carrier frequency to improve energy efficiency, energy conservation and emission reduction when in a low load. In addition to the judgment of the load of the air conditioning system according to the difference D between the set temperature T1 of the remote controller and the indoor environment temperature T2 in S20, the load of the air conditioning system is further judged according to the ratio of the temperatures of the coils of the indoor unit and the outdoor unit of the inverter air conditioner.
Specifically, the indoor unit coil temperature (recorded as T3) is obtained through an indoor coil temperature sensor of the inverter air conditioner, the outdoor unit coil temperature (recorded as T4) is obtained through an outdoor coil temperature sensor of the inverter air conditioner, and the indoor coil temperature sensor and the outdoor coil temperature sensor respectively reflect the pressure conditions of an internal machine system and an external machine system of the inverter air conditioner. Under the refrigeration working condition, the ratio (marked as K) is the value obtained by dividing the outdoor unit coil temperature T4 by the indoor unit coil temperature T3, that is, the refrigeration working condition ratio K is T4/T3. Under the heating working condition, the ratio K is a value obtained by dividing the indoor unit coil temperature T3 by the outdoor unit coil temperature T4, that is, the ratio K is T3/T4 under the heating working condition. The larger the ratio K is, the larger the load of the air conditioning system is, the higher the frequency conversion is, the higher the carrier frequency operation is, and the smaller the ratio K is, the smaller the load of the air conditioning system is, the lower the carrier frequency operation is.
The high carrier frequency, i.e., the first carrier frequency, has a value range of, for example, 5KHZ to 6.5KHZ, and the low carrier frequency, i.e., the second carrier frequency, has a value range of, for example, 3KHZ to 5 KHZ.
In a preferred embodiment, the predetermined scaling factor for comparison with the ratio K can be obtained experimentally. When an APF (Annual energy consumption efficiency) Performance test is carried out, intermediate refrigeration and intermediate heating belong to a low-load working condition, rated refrigeration and rated heating belong to a medium-load working condition, and maximum refrigeration and maximum heating belong to a high-load working condition. The size of the ratio K in normal operation under each working condition can be easily determined through a related environment test in the system development process and is used as a preset proportionality coefficient under each working condition. And taking the preset proportionality coefficient under the ideal state of each working condition as a judgment standard of the ratio K during the actual operation of each working condition, and performing targeted control on each working condition.
Furthermore, in order to simplify the control conditions, the ratio of the outdoor unit coil temperature T4 divided by the indoor unit coil temperature T3 is measured under the intermediate refrigeration working condition and is used as the preset proportionality coefficient under the refrigeration working condition. For example, in the intermediate cooling condition, the measured outdoor unit coil temperature is 40 ℃, the measured indoor unit coil temperature is 16 ℃, and then the ratio K is the outdoor unit coil temperature T4(40 ℃)/the indoor unit coil temperature T3(16 ℃), which is 2.5, and is used as the preset proportionality coefficient in the cooling condition. In the subsequent control, when the actually measured ratio K is more than or equal to 2.5, the load of the air conditioning system is large, and high carrier frequency operation is needed to stabilize the system and reduce the noise; when the actually measured ratio K is less than 2.5, the air conditioning system is low in load and can operate at low carrier frequency, so that the energy efficiency of the whole machine is improved, and energy conservation is realized.
Similarly, the ratio of the temperature of the coil pipe of the indoor unit to the temperature of the coil pipe of the outdoor unit is measured under the intermediate heating working condition and is used as the preset proportionality coefficient under the heating working condition.
Further, referring to fig. 2, in a preferred embodiment, the step of controlling the variable frequency air conditioner to operate at the first carrier frequency specifically includes, according to that a ratio K between an indoor unit coil temperature T3 and an outdoor unit coil temperature T4 is greater than or equal to a preset proportionality coefficient:
s40, judging whether the ratio K between the indoor unit coil temperature T3 and the outdoor unit coil temperature T4 is larger than or equal to a preset proportionality coefficient, if so, executing S405; s405, judging whether the duration time of the ratio K is greater than or equal to the preset proportional coefficient reaches a first stable time, if so, executing S50; and S50, controlling the inverter air conditioner to operate at the first carrier frequency.
That is, when the K value of the air conditioning system reaches the preset proportionality coefficient, a certain stabilization time is required to trigger the corresponding carrier operating condition under the K value condition, so as to ensure the stability of the air conditioning system. The first stabilization time may be set according to the process conditions, for example, to 0.5 h.
Similarly, referring to fig. 3, the step of controlling the inverter air conditioner to operate at the second carrier frequency specifically includes, according to the fact that the ratio K between the indoor unit coil temperature T3 and the outdoor unit coil temperature T4 is smaller than the preset proportionality coefficient:
s40, judging whether the ratio K between the indoor unit coil temperature T3 and the outdoor unit coil temperature T4 is smaller than a preset proportionality coefficient, if yes, executing S406; s406, judging whether the duration time of the ratio K which is less than the preset proportionality coefficient reaches a second stable time, if so, executing S60; and S60, controlling the variable frequency air conditioner to operate at the second carrier frequency.
That is, when the K value of the operation of the air conditioning system is smaller than the preset proportionality coefficient and lasts for the second stable time, the variable frequency air conditioner is controlled to operate at a low carrier frequency so as to ensure the stability of the air conditioning system. The second stabilization time can also be set according to the process conditions, for example to 0.5 h.
In the present embodiment, a temperature difference D between a set temperature T1 of the air conditioner remote controller and an indoor ambient temperature T2 is used as a first determination condition, and when the temperature difference D is greater than or equal to a preset temperature threshold, the air conditioning system operates at a first carrier frequency (high carrier frequency). When the temperature difference D is smaller than a preset temperature threshold value, entering a second judgment condition, and operating the air conditioning system at a first carrier frequency (high carrier frequency) according to a ratio K between the indoor unit coil temperature T3 and the outdoor unit coil temperature T4 and a preset proportionality coefficient when the ratio K is larger than or equal to the preset proportionality coefficient; when the ratio K is smaller than the preset proportionality coefficient, the air conditioning system operates at a second carrier frequency (low carrier frequency). Therefore, the variable frequency air conditioner can run at high carrier frequency under high load, so as to stabilize the system performance and reduce noise; and the system operates at low carrier frequency under low load so as to improve the energy efficiency of the whole machine and realize energy conservation.
The embodiment of the invention also provides a variable frequency air conditioner which adopts the carrier frequency control method described in the embodiment to carry out carrier frequency control.
In summary, the frequency control method of the inverter air conditioner and the inverter air conditioner of the present invention have at least the following advantages:
the temperature difference between the set temperature and the indoor environment temperature of the remote controller for monitoring the variable frequency air conditioner is used as a first judgment condition, the ratio between the temperature of the indoor coil pipe and the temperature of the outdoor coil pipe is used as a second judgment condition, the variable frequency air conditioner is operated at a high carrier frequency under a high-load working condition, the performance of the system is stabilized, noise is reduced, the variable frequency air conditioner is operated at a low carrier frequency under a low-load working condition, the energy efficiency of the whole machine is improved, and energy conservation is realized.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (9)
1. A carrier frequency control method of a variable frequency air conditioner is characterized by comprising the following steps:
s10, acquiring the set temperature of the remote controller of the variable frequency air conditioner and the indoor environment temperature;
s20, judging whether the difference value between the set temperature of the remote controller and the indoor environment temperature is larger than or equal to a preset temperature difference, if so, executing S50, and if not, executing S30;
s30, acquiring the temperature of an indoor unit coil and the temperature of an outdoor unit coil of the variable frequency air conditioner;
s40, judging whether the ratio of the indoor unit coil temperature to the outdoor unit coil temperature is larger than or equal to a preset proportionality coefficient, if so, executing S50, and if not, executing S60;
s50, controlling the variable frequency air conditioner to operate at a first carrier frequency;
and S60, controlling the variable frequency air conditioner to operate at a second carrier frequency, wherein the first carrier frequency is greater than the second carrier frequency.
2. The carrier frequency control method of claim 1, wherein the first carrier frequency is in a range of 5KHZ to 6.5KHZ and the second carrier frequency is in a range of 3KHZ to 5 KHZ.
3. The carrier frequency control method of claim 1, wherein the predetermined temperature difference is 2 ℃ or less.
4. The carrier frequency control method of claim 1, wherein between steps S40 and S50 further comprising:
s405, judging whether the duration time of the ratio is greater than or equal to the preset proportional coefficient reaches a first stable time, and if so, executing S50.
5. The carrier frequency control method of claim 1, wherein between steps S40 and S60 further comprising:
s406, judging whether the duration time of the ratio smaller than the preset proportionality coefficient reaches a second stable time, if so, executing S60.
6. The carrier frequency control method of claim 1, wherein the inverter air conditioner comprises a cooling condition and a heating condition;
under the refrigeration working condition, the difference value is obtained by subtracting the set temperature of the remote controller from the indoor environment temperature, and the ratio is obtained by dividing the outdoor unit coil temperature by the indoor unit coil temperature;
under the heating working condition, the difference value is obtained by subtracting the indoor environment temperature from the temperature set by the remote controller, and the ratio value is obtained by dividing the coil temperature of the indoor unit by the coil temperature of the outdoor unit.
7. The carrier frequency control method of claim 6, wherein:
measuring the ratio of the outdoor unit coil temperature to the indoor unit coil temperature under the intermediate refrigeration working condition, and taking the ratio as a preset proportionality coefficient under the refrigeration working condition;
and measuring the ratio of the temperature of the coil pipe of the indoor unit to the temperature of the coil pipe of the outdoor unit under the intermediate heating working condition, and taking the ratio as a preset proportionality coefficient under the heating working condition.
8. The carrier frequency control method of claim 1, wherein the indoor ambient temperature is obtained by an indoor temperature sensor of the inverter air conditioner, the indoor unit coil temperature is obtained by an indoor coil temperature sensor of the inverter air conditioner, and the outdoor unit coil temperature is obtained by an outdoor coil temperature sensor of the inverter air conditioner.
9. An inverter air conditioner, characterized in that the inverter air conditioner performs carrier frequency control by using the carrier frequency control method according to any one of claims 1 to 8.
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