CN108278740B - Control method and device for auxiliary electric heating of variable frequency air conditioner - Google Patents
Control method and device for auxiliary electric heating of variable frequency air conditioner Download PDFInfo
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- CN108278740B CN108278740B CN201710004776.4A CN201710004776A CN108278740B CN 108278740 B CN108278740 B CN 108278740B CN 201710004776 A CN201710004776 A CN 201710004776A CN 108278740 B CN108278740 B CN 108278740B
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Abstract
The invention provides a control method and a device for auxiliary electric heating of a variable frequency air conditioner, wherein the control method comprises the following steps: starting a heating machine, wherein the inverter air conditioner is in a heating mode, and a compressor of the inverter air conditioner and auxiliary electric heating of the inverter air conditioner are started; acquiring the instant output heating quantity Pt of the air conditioner, the electric heating power P3 and the maximum output heating quantity Pmax of the air conditioner; when Pmax is larger than or equal to (Pt + P3), the auxiliary electric heating stops working, and at the moment, the operating frequency of the variable frequency compressor is improved according to the total heating quantity of the whole air conditioner when the auxiliary electric heating exits, and the total heating quantity is kept unchanged. The invention solves the problem of indoor temperature fluctuation when the auxiliary electric heating is quitted in the prior art, realizes that the total heating quantity is kept unchanged when the auxiliary electric heating is quitted, and improves the comfort of the user.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method and a device for auxiliary electric heating of a variable frequency air conditioner.
Background
The compressor frequency of a conventional inverter compressor is adjusted according to the difference between the indoor temperature and the set temperature (some products, such as the indoor coil temperature, the outdoor environment temperature, the outdoor coil temperature, the exhaust temperature, the current and other parameters, can also influence the compressor frequency and are generally used for protection).
When the air conditioner heats, the use of auxiliary electric heating (auxiliary electric heating for short) can improve the comfort effect of heating of the air conditioning unit. The change conditions of the operating frequency, the heating capacity and the indoor temperature of the compressor in several modes of the variable frequency air conditioner are explained:
the first method comprises the following steps: no auxiliary electric heating. As shown in fig. 1, a compressor operation frequency curve 11, a heating amount curve 12, and a variation curve 13 of an indoor temperature. After the air conditioner is started, the frequency of the compressor is rapidly increased to f1 (the highest frequency of the compressor), the corresponding heating capacity of the air conditioner is increased from 0 to P1 (the maximum heating capacity), and the indoor temperature is gradually increased from T0; after the air conditioner is continuously operated for a period of time, the frequency of the compressor can be gradually reduced due to the gradual rise of the indoor environment temperature, and finally the indoor temperature can be basically maintained at the target temperature T1 when the frequency is reduced to f2 (when auxiliary electric heating is not performed, the operating frequency of the compressor reaches the target temperature), correspondingly, the air conditioner outputs the heating quantity of P2 (the heating quantity during balance) at the moment, and the required heat quantity of the indoor space is also P2.
And the second method comprises the following steps: the auxiliary electric heating is always running. As shown in fig. 2, a compressor operation frequency curve 21, a heating amount curve 22, and a variation curve 23 of an indoor temperature. After the air conditioner is started, the maximum heating capacity can reach P4 (P4 = P3+ P1) due to the auxiliary electric heating work; and because the indoor environment temperature rises more quickly, the indoor temperature can be basically maintained at the target temperature T1 at T2 (the time required for reaching the target temperature when the auxiliary electric heating is operated all the time), the frequency of the compressor reaches f3 (the frequency of the compressor is increased when the auxiliary electric heating is operated all the time and the target temperature is reached), the obvious time required for reaching the target temperature T2 is less than T1, and the frequency of the compressor is less than f3 and less than f 2. Under the relatively abominable condition of outdoor environment and when indoor temperature does not reach user's target temperature, open supplementary electrical heating and help improving the air-out temperature, shorten the heat balance time, improved air conditioner and used the travelling comfort, however, the obvious shortcoming of this kind of mode of operation is that supplementary electrical heating works always, is unfavorable for energy-conservation.
And the third is that: and the auxiliary electric heating stops running after the indoor temperature or the temperature of the coil reaches a certain value. As shown in fig. 3, the compressor operation frequency curve 31, the heating capacity curve 32 and the indoor temperature variation curve 33 stop the auxiliary electric heating at t3 (the auxiliary electric heating exit time), the heating capacity immediately decreases P3, the compressor frequency still maintains the original trend operation at this time, the heating capacity curve 32 fluctuates, the indoor temperature will rise and decrease gradually, and the compressor frequency is adjusted and increased after the temperature parameters obviously fluctuate; the heating capacity is notched, which brings about the problems that the indoor temperature fluctuation is large and the use comfort of users is reduced.
In addition, the heating efficiency of the auxiliary electric heating is much lower than that of the air conditioner compressor, so that the auxiliary electric heating of the air conditioner needs to be stopped working at a proper time, otherwise, the energy waste is caused.
Chinese patent CN 104075405B discloses an auxiliary heating method and an auxiliary heating device, and particularly discloses an auxiliary electric heater for intelligently controlling a variable frequency air conditioner, so that the auxiliary electric heater of a heat pump type variable frequency air conditioner can be adaptively turned on and off to ensure that the indoor temperature is stable and the energy consumption is reduced, thereby achieving the purposes of saving energy and improving user experience, but still has the problems of large indoor temperature fluctuation caused by frequent turning on and off of the electric heater, and reduced user comfort.
How to reasonably control auxiliary electric heating (auxiliary electric heating for short) and simultaneously keep the total heating quantity unchanged when the auxiliary electric heating is withdrawn so as to ensure the comfort of a user, and an effective solution is not proposed at present.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a control method for auxiliary electric heating of an inverter air conditioner, which realizes reasonable control of the auxiliary electric heating, and particularly maintains the total heating capacity unchanged by quickly increasing the operating frequency of an inverter compressor when the auxiliary electric heating is quitted.
In order to achieve the purpose, the invention adopts the following technical scheme:
a control method for auxiliary electric heating of a variable frequency air conditioner is characterized in that when the auxiliary electric heating is quitted, the total heating capacity is kept unchanged, and the control method is characterized in that: the control method comprises the following steps:
(1) starting a heating machine, wherein the inverter air conditioner is in a heating mode, and a compressor of the inverter air conditioner and auxiliary electric heating of the inverter air conditioner are started;
(2) acquiring the instant output heating quantity Pt of the air conditioner, the electric heating power P3 and the maximum output heating quantity Pmax of the air conditioner;
(3) when Pmax is larger than or equal to (Pt + P3), the auxiliary electric heating stops working, and at the moment, the operating frequency of the variable frequency compressor is improved according to the total heating quantity of the whole air conditioner when the auxiliary electric heating exits, and the total heating quantity is kept unchanged.
Further, the instant output heating capacity obtained in the step (2) is the heating capacity at the current frequency at the current temperature and wind speed, and the maximum output heating capacity is the heating capacity at the maximum frequency at the current temperature and wind speed.
Further, the control method comprises the following steps: when the auxiliary electric heating is quitted, the operation frequency of the variable frequency compressor is improved according to the corresponding relation between the preset heating quantity and the operation frequency of the compressor, and the total heating quantity is kept unchanged.
According to some embodiments of the present invention, a control device for auxiliary electric heating of an inverter air conditioner comprises:
the data acquisition module is used for acquiring the instant output heating quantity Pt of the air conditioner at the current temperature, wind speed and frequency, and acquiring the auxiliary electric heating power P3 and the maximum output heating quantity Pmax of the air conditioner at the current temperature, wind speed and frequency;
the processing module is used for judging whether the current temperature, the wind speed and the maximum output heating capacity Pmax at the maximum frequency are larger than or equal to the sum of the instant output heating capacity Pt and the auxiliary electric heating power P3 at the current temperature, the wind speed and the frequency;
the control module is used for controlling the working state of the auxiliary electric heating;
and the operation frequency adjusting module is used for adjusting the operation frequency of the variable frequency compressor according to the total heating capacity of the whole air conditioner when the auxiliary electric heating exits.
Further, the control module comprises:
the starting unit is used for starting the auxiliary electric heating when the heating is needed;
and the closing unit is used for closing the auxiliary electric heating when the maximum output heating quantity Pmax is larger than or equal to the sum of the instant output heating quantity Pt auxiliary electric heating power P3 in the heating process.
The invention has the beneficial effects that:
the research of the invention finds that whether the current temperature and wind speed are judged, and the output heating amount Pmax is larger than or equal to the sum of the output heating amount Pt and the auxiliary electric heating power P3 under the current temperature, wind speed and frequency when the frequency is the maximum or not is judged so as to determine the working state of the auxiliary electric heating, when the Pmax is larger than or equal to (Pt + P3), the auxiliary electric heating stops working, at the moment, the operating frequency of the variable frequency compressor is adjusted according to the heating amount Pmax obtained when the auxiliary electric heating is quitted, and the heat gap caused by the quitting of the electric heating is filled in time by improving the operating frequency of the compressor so as to maintain the total heating amount unchanged, thereby keeping the indoor temperature stable and improving the use comfort of a user. Meanwhile, compared with the third variable frequency air conditioning mode, the time for reaching the target temperature indoors is shortened.
Drawings
FIG. 1 is a simulation of a conventional unassisted electric heater;
FIG. 2 is a simulation comparing the operation of the auxiliary electric heater with the non-auxiliary electric heater;
FIG. 3 is a simulation comparing a conventional auxiliary electric heating exit mode with an auxiliary electric heating operation;
FIG. 4 is a simulation diagram of the operation of the auxiliary electric heating exit mode of the present invention and the conventional auxiliary electric heating exit mode;
FIG. 5 is a flow chart of a method for controlling auxiliary electric heating of an inverter air conditioner according to an embodiment of the present invention;
FIG. 6 is a block diagram of the control device for auxiliary electric heating of inverter air conditioner.
Reference numerals:
11. compressor operating frequency variation curve (without auxiliary electrical heating); 12. heating capacity change curve (without auxiliary electric heating); 13. the change curve of the indoor temperature (without auxiliary electric heating); 21. the variation curve of the running frequency of the compressor (the auxiliary electric heating is always running); 22. heating capacity change curve (auxiliary electric heating is always operated); 23. the change curve of the indoor temperature (the auxiliary electric heating is always operated); 31. the variation curve of the running frequency of the compressor (the traditional auxiliary electric heating exit mode); 32. heating capacity change curve (traditional auxiliary electric heating exit mode); 33. the change curve of the indoor temperature (the traditional auxiliary electric heating exit mode); 41. the change curve of the running frequency of the compressor (the auxiliary electric heating exit mode of the invention); 42. a heating capacity change curve (the auxiliary electric heating exit mode of the invention); 43. the change curve of the indoor temperature (the auxiliary electric heating exit mode of the invention);
101. a data acquisition module; 102. A processing module; 103. A control module; 104. And operating the frequency adjustment module.
Detailed Description
Example 1
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
The following describes a control method for auxiliary electric heating of an inverter air conditioner according to an embodiment of the present invention with reference to the accompanying drawings.
As shown in fig. 4, the method for controlling auxiliary electric heating of an inverter air conditioner in the embodiment of the present invention includes the following steps:
s1, starting heating, enabling the inverter air conditioner to be in a heating mode, starting a compressor of the inverter air conditioner and auxiliary electric heating of the inverter air conditioner, and executing the step S2;
s2, acquiring the instant output heating quantity Pt of the air conditioner under the current temperature, wind speed and frequency, acquiring the auxiliary electric heating power P3 and the maximum output heating quantity Pmax of the air conditioner under the current temperature, wind speed and frequency, and executing the step S3;
s3, judging whether Pmax is larger than or equal to the sum of Pt and P3; if so, go to step S4; if not, executing step S2 to continue detection;
and S4, stopping the auxiliary electric heating, and increasing the operating frequency of the variable frequency compressor according to the total heating capacity of the whole air conditioner when the auxiliary electric heating is quitted.
In the above embodiment, after the auxiliary electric heating stops working, when the auxiliary electric heating exits, the operating frequency of the inverter compressor is adjusted according to the corresponding relationship between the preset heating capacity and the operating frequency of the compressor, so as to maintain the total heating capacity unchanged. After that, the compressor frequency gradually tends to be stable due to the gradual rise of the indoor ambient temperature after the air conditioner is continuously operated for a period of time, and the output heating capacity of the air conditioner also tends to balance the heating capacity to reach the indoor required temperature.
In one embodiment of the present invention, if the auxiliary electric heating is a tube-mounted heating wire, the heating power is not changed and is directly known as P = U by design2R; if the auxiliary electric heating is PTC, the heating power of the electric heater under different indoor environment temperatures, different coil temperatures and different wind speeds is measured in advance and stored in the controller for table lookup.
Pmax is the heating capacity calculated by measuring in advance different indoor ambient temperatures, outdoor ambient temperatures, different wind speeds, and different frequencies, and is stored in the controller for table lookup. Pt is also the heating capacity calculated according to different temperatures, wind speeds and frequencies, and specifically, how to measure these values and the conversion relationship is the prior art, and the present invention is not described in detail.
The above steps are exemplified below:
the electric heating power of the variable frequency air conditioner at the moment is as follows: 2000W (P3);
under the current temperature and wind speed of the air conditioner, the actual operating frequency of the compressor is 50Hz, the corresponding instant output heating capacity is 5000W (Pt), and it needs to be explained that the specific heating capacity data is a numerical value calculated according to the ambient temperature and the frequency, and the same applies below;
under the current temperature and wind speed of the air conditioner, the maximum frequency allowed by the compressor is 55Hz, and the corresponding maximum output heating capacity is 5500W (Pmax);
because 5500W <7000W, the electrical heating can not withdraw at this moment; and continuously acquiring the instant output heating quantity, after a period of time (the instant output heating quantity can be calculated once by taking 20s as a unit), stopping the electric heating when the Pmax is more than or equal to (Pt + P3), and if the total heating quantity at the moment is 5500W, increasing the operating frequency of the compressor according to the preset output heating quantity and keeping the total heating quantity unchanged. Therefore, the indoor temperature is basically not influenced by the exit of the auxiliary electric heating, the fluctuation of the indoor temperature is avoided, the time for reaching the target temperature indoors is not prolonged, and a comfortable environment is created.
Based on the same inventive concept, the embodiment of the present invention further provides a control device for auxiliary electric heating of an inverter air conditioner, as described in the following embodiments. Because the problem solving principle of the control device for the auxiliary electric heating of the inverter air conditioner is similar to that of the control method of the control device for the auxiliary electric heating of the inverter air conditioner, the implementation of the control device for the auxiliary electric heating of the inverter air conditioner can refer to the implementation of the control method for the auxiliary electric heating of the inverter air conditioner, and repeated parts are not repeated. As used hereinafter, the term "unit" or "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated. Fig. 6 is a block diagram of a structure of a control device for auxiliary electric heating of an inverter air conditioner, as shown in fig. 6, the control device includes a data acquisition module 101, a processing module 102, a control module 103, and an operation frequency adjustment module 104, and the structure will be described in detail below.
The data acquisition module 101 is used for acquiring the instant output heating capacity Pt of the air conditioner at the current temperature, wind speed and frequency, and acquiring the auxiliary electric heating power P3 and the maximum output heating capacity Pmax of the air conditioner at the current temperature, wind speed and frequency;
the processing module 102 is configured to determine whether the current temperature, the current wind speed, and the maximum output heating amount Pmax at the maximum frequency are greater than or equal to a sum of the instant output heating amount Pt and the auxiliary electric heating power P3 at the current temperature, the current wind speed, and the current frequency;
the control module 103 is used for controlling the working state of the auxiliary electric heating;
and the operation frequency adjusting module 104 is used for adjusting the operation frequency of the variable frequency compressor according to the total heating capacity of the whole air conditioner when the auxiliary electric heating exits.
In one embodiment, the control module 103 may include: the starting unit is used for starting the auxiliary electric heating when the heating is needed; and the closing unit is used for closing the auxiliary electric heating when the maximum output heating quantity Pmax is larger than or equal to the sum of the instant output heating quantity Pt auxiliary electric heating power P3 in the heating process.
The specific working mode and principle are as follows:
as shown in fig. 4-6, when the inverter air conditioner is in the heating mode, during the operation process, the data obtaining module 101 obtains the instant output heating amount Pt, the auxiliary electric heating power P3, and the maximum output heating amount Pmax in real time, and transmits the signals to the processing module 102, and the processing module 102 transmits the signals to the processing module 102 according to the set formula: pmax is not less than (Pt + P3), when the relation is satisfied, a signal is sent to the control module 103 to turn off the auxiliary electric heating, and meanwhile, the operation frequency adjusting module 104 adjusts the operation frequency of the inverter compressor according to the total heating capacity of the whole air conditioner when the auxiliary electric heating exits. Specifically, as shown in fig. 4, a compressor operation frequency curve 41, a heating amount curve 42, and a variation curve 43 of the indoor temperature. Along with the gradual rise of the indoor environment temperature, the frequency of the compressor is gradually reduced, when the time t5 (the time for stopping the auxiliary electric heating in the auxiliary electric heating quitting mode of the invention) is set, Pmax is more than or equal to (Pt + P3), the auxiliary electric heating stops working, the heating quantity is immediately reduced by P3, after the electric heating stops, the operation frequency of the compressor is immediately adjusted according to the heating quantity of the whole air conditioner when the auxiliary electric heating quits, the heat gap caused by the quitting of the electric heating is timely filled by improving the operation frequency of the compressor, and the total heating quantity is kept unchanged. Therefore, the indoor temperature is basically not influenced by the exit of the auxiliary electric heating, the fluctuation of the indoor temperature is avoided, the time for reaching the target temperature indoors is not prolonged, and a comfortable environment is created.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the embodiment of the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A control method for auxiliary electric heating of a variable frequency air conditioner is characterized in that when the auxiliary electric heating is quitted, the total heating capacity is kept unchanged, and the control method is characterized in that: the control method comprises the following steps:
(1) starting a heating machine, wherein the inverter air conditioner is in a heating mode, and a compressor of the inverter air conditioner and auxiliary electric heating of the inverter air conditioner are started;
(2) acquiring the instant output heating quantity Pt of the air conditioner, the electric heating power P3 and the maximum output heating quantity Pmax of the air conditioner;
(3) when Pmax is larger than or equal to (Pt + P3), the auxiliary electric heating stops working, at the moment, the running frequency of a compressor of the variable frequency air conditioner is improved according to the total heating quantity of the whole air conditioner when the auxiliary electric heating exits, and the total heating quantity is kept unchanged;
the instant output heating capacity obtained in the step (2) is the heating capacity of the current frequency at the current temperature and wind speed, and the maximum output heating capacity is the heating capacity of the maximum frequency at the current temperature and wind speed.
2. The control method according to claim 1, characterized in that: the control method comprises the following steps: when the auxiliary electric heating is quitted, the operation frequency of the compressor of the variable frequency air conditioner is improved according to the corresponding relation between the preset heating capacity and the operation frequency of the compressor, and the total heating capacity is kept unchanged.
3. The utility model provides a control device of frequency conversion air conditioner auxiliary electric heating which characterized in that: the control device comprises:
the data acquisition module (101) is used for acquiring the instant output heating quantity Pt of the air conditioner at the current temperature, wind speed and frequency, and acquiring the auxiliary electric heating power P3 and the maximum output heating quantity Pmax of the air conditioner at the current temperature, wind speed and frequency;
the processing module (102) is used for judging whether the current temperature, the current wind speed and the maximum output heating capacity Pmax at the maximum frequency are larger than or equal to the sum of the instant output heating capacity Pt and the auxiliary electric heating power P3 at the current temperature, the current wind speed and the current frequency;
the control module (103) is used for controlling the working state of the auxiliary electric heating;
and the operation frequency adjusting module (104) is used for adjusting the operation frequency of the compressor of the variable frequency air conditioner according to the total heating quantity of the whole air conditioner when the auxiliary electric heating exits.
4. The control device according to claim 3, characterized in that: the control module (103) comprises:
the starting unit is used for starting the auxiliary electric heating when the heating is needed;
and the closing unit is used for closing the auxiliary electric heating when the maximum output heating quantity Pmax is larger than or equal to the sum of the instant output heating quantity Pt auxiliary electric heating power P3 in the heating process.
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| CN109520089A (en) * | 2018-11-23 | 2019-03-26 | 奥克斯空调股份有限公司 | A kind of air-conditioning auxiliary electrical heater control method, device and air conditioner |
| CN109855264A (en) * | 2018-12-27 | 2019-06-07 | 奥克斯空调股份有限公司 | Auxiliary electric heater unit Failure Control method, apparatus, air conditioner and storage medium |
| CN109708269B (en) * | 2019-02-25 | 2023-11-24 | 珠海格力电器股份有限公司 | Air conditioner and electric heater control method, device and equipment thereof |
| CN113357753B (en) * | 2020-03-03 | 2022-11-18 | 青岛海尔空调电子有限公司 | Heating control method of variable frequency air conditioner and variable frequency air conditioner |
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