CN109341006B - Variable frequency air conditioner control device and control method - Google Patents
Variable frequency air conditioner control device and control method Download PDFInfo
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- CN109341006B CN109341006B CN201710648020.3A CN201710648020A CN109341006B CN 109341006 B CN109341006 B CN 109341006B CN 201710648020 A CN201710648020 A CN 201710648020A CN 109341006 B CN109341006 B CN 109341006B
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Abstract
The invention provides a control device and a control method of a variable frequency air conditioner, which relate to the technical field of variable frequency air conditioners, and the control method comprises the following steps: starting the variable frequency air conditioner; driving the variable frequency air conditioner to operate in a test mode; the outer fan performs a preset periodic operation mode. The invention also provides another variable frequency air conditioner control method, which comprises the following steps: starting the variable frequency air conditioner; driving the variable frequency air conditioner to operate in a test mode; detecting and judging the temperature T of the outer coil of the outdoor heat exchanger of the variable frequency air conditionerOuter plateWhether it is greater than a preset temperature threshold T1(ii) a If so, executing a preset periodic operation mode on an external fan of the variable frequency air conditioner control device; if not, the external fan keeps a continuous opening state. Wherein, inverter air conditioner controlling means includes: outdoor heat exchanger, thermodetector and outer fan. The control device and the method of the variable frequency air conditioner effectively improve the energy efficiency of the air conditioner and avoid the problem that the APF value of an alternating current fan with a single-gear rotating speed cannot be improved because the rotating speed of the fan cannot be adjusted.
Description
Technical Field
The invention relates to the field of variable frequency air conditioners, in particular to a control device and a control method of a variable frequency air conditioner.
Background
Energy conservation and environmental protection become global concerns, the increasingly serious 'electricity shortage' enables the energy-saving concept of the air conditioner to be rapidly heated, and the air conditioner is extremely important as a large energy-consuming household for the household life of people, so that the energy efficiency is improved. From 2013, 10, 1 and 10 months, the new energy efficiency standard of the variable frequency air conditioner is formally implemented, and the China air conditioner industry formally enters the APF era, so that more comprehensive requirements are provided for the level of the air conditioner product. APF (annual Performance factor) -annual energy consumption rate, namely: in the cooling season and the heating season, the ratio of the total amount of heat removed from the room and the total amount of heat supplied to the room during the cooling (heating) operation of the air conditioner to the total amount of electricity consumed during the same period is also called the annual total energy efficiency ratio. The higher the APF value, the lower the electricity consumption in the same period, and the more energy-saving the air conditioner.
At present, the energy efficiency of air-conditioning products is improved mainly from two aspects, on one hand, the improvement is realized by improving an indoor unit, such as enlarging the area of an indoor heat exchanger, improving the rotating speed of a motor or adopting a high-performance motor; on the other hand, the outdoor unit is improved, such as a high-performance compressor is selected, the area of an outdoor heat exchanger is increased, a high-performance motor is adopted, and an optimized control method is adopted. However, each type of indoor unit relates to a large number of molds, if brand new development of the indoor unit is needed, mold development such as injection molding and sheet metal is possibly involved, investment is large, the period is long, and the indoor unit is not suitable for flexible and changeable market demands, so that the indoor unit is generally not changed greatly when the energy efficiency is upgraded. The types of the outdoor units are much less, and the improvement of the outdoor units to improve the energy efficiency is more convenient and effective, so that the development of products such as energy efficiency upgrading is mainly carried out from the outdoor units in the industry. Heretofore, for a frequency converter with an outdoor unit adopting a direct current motor, the APF can be improved by reducing the rotating speed of the external fan in an intermediate frequency test mode, but for an alternating current fan adopting a single-gear rotating speed, because the rotating speed of the fan cannot be adjusted, a corresponding test method for improving the APF does not exist.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
In view of the above problems, the present invention provides a control method and a control device for an inverter air conditioner, so as to solve the problem that the existing inverter air conditioner adopting a single-gear speed alternating current fan cannot improve the APF energy efficiency because the fan speed cannot be adjusted.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a control method of a variable frequency air conditioner, which comprises the following steps:
s11, starting the variable frequency air conditioner;
s12, driving the variable frequency air conditioner to operate in a test mode;
and S13, executing a preset period operation mode by the outer fan.
Further, the step of the external fan executing the preset periodic operation mode includes:
s131, starting the outer fan, driving the rotating speed of the outer fan to reach a first rated rotating speed and operating for a first time period;
and S132, closing the outer fan, operating for a second time, reducing the outer fan by means of the inertial rotating speed, and restarting the outer fan to operate for the first time when the rotating speed of the outer fan is reduced to a second rated rotating speed.
Further, the first rated rotating speed and the second rated rotating speed of the outer fan are set according to the state of guaranteeing stable operation of the variable frequency air conditioner, wherein the first rated rotating speed of the outer fan is greater than the second rated rotating speed, and the sum of the first duration and the second duration is a preset period of the outer fan.
Further, the invention also provides another variable frequency air conditioner control method, which comprises the following steps:
s21, starting the variable frequency air conditioner;
s22, driving the variable frequency air conditioner to operate in a test mode;
s23, detecting and judging the temperature T of the outer coil of the outdoor heat exchanger of the variable frequency air conditionerOuter plateWhether it is greater than a preset temperature threshold T1；
S24, outer coil temperature TOuter plateGreater than a predetermined temperature threshold T1Executing a preset periodic operation mode on an external fan of the variable frequency air conditioner control device;
s25, outer coil temperature TOuter plateNot greater than a preset temperature threshold T1And the outer fan keeps a continuous opening state.
Further, the step of the external fan executing the preset periodic operation mode includes:
s241, starting the outer fan and continuing for a first rated time;
s242, detecting and judging the temperature T of the outer coil of the outdoor heat exchanger of the variable frequency air conditionerOuter plateWhether it is less than a preset temperature threshold T2；
S243, outer coil temperature TOuter plateLess than a predetermined temperature threshold T2Closing the outer fan and continuing for a second rated time; s244, temperature T of outer coilOuter plateNot less than a predetermined temperature threshold T2The outer fan lasts for a first rated time.
Further, a first rated time of the outer fanAccording to the outdoor coil temperature TOuter plateWith a predetermined temperature threshold T1And T2Setting the difference value of (1); the second rated time of the outer fan is according to the temperature T of the outdoor coil pipeOuter plateWith a predetermined temperature threshold T2Setting the difference value of (1); and the preset temperature threshold value T1Greater than T2。
Further, the sum of the first rated time and the second rated time of the external fan is a preset period of the external fan.
Further, the inverter air conditioner control device adopted by the control method comprises: an outdoor heat exchanger; a temperature detector for detecting the temperature T of the outer coil of the outdoor heat exchangerOuter plate(ii) a And an outer fan disposed in an outdoor unit of the air conditioner to generate an air flow exchanging heat with the outdoor heat exchanger, and configured to be at an outer coil temperature T of the outdoor heat exchangerOuter plateGreater than a predetermined temperature threshold T1And the outer fan executes a preset period operation mode.
Further, the external fan sets a preset temperature threshold T within a first rated time during a preset period operation mode2At said outer coil temperature TOuter plateLess than a predetermined temperature threshold T2And the outer fan is turned off and is turned on again when the turn-off time reaches a second rated time.
Further, the outer fan is also configured to control the temperature T of the outer coil of the outdoor heat exchangerOuter plateNot greater than a preset temperature threshold T1And meanwhile, the outer fan keeps a continuous opening state.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of an inverter air conditioner control device according to the present invention;
FIG. 2 is a schematic diagram of a control method of an inverter air conditioner according to the present invention;
FIG. 3 is a flow chart of a control method of an inverter air conditioner according to the present invention;
FIG. 4 is a schematic diagram of another inverter air conditioner control method according to the present invention;
FIG. 5 is a flowchart illustrating another inverter air conditioner control method according to the present invention;
fig. 6 is a schematic view showing the variation of each operation parameter with time in both the case where the outside fan is kept continuously turned on and the outside fan performs the preset periodic repetitive operation mode according to an embodiment of the present invention.
Detailed Description
Fig. 1 is a schematic diagram of an inverter air conditioner control device 100 according to an embodiment of the present invention, and the inverter air conditioner control device 100 according to the embodiment includes: an outdoor heat exchanger 110, an outer coil temperature detector 120, and an outer fan 130.
The working process of the variable frequency air conditioner control device 100 is as follows: the compressor 140 pressurizes the gas refrigerant to make it in a high-temperature and high-pressure state, the discharged high-temperature and high-pressure gas flows to the outdoor heat exchanger 110, the external fan 130 is turned on, heat exchange is performed between the outdoor heat exchanger 110 and the outdoor air, meanwhile, heat in the refrigerant is released, the refrigerant is changed into a normal-temperature and high-pressure liquid, and then, the throttling and pressure reduction are performed through the capillary tube, and the normal-temperature and high-pressure liquid is changed into a low-temperature and low. After the refrigerant passes through the indoor heat exchanger and evaporates to absorb indoor heat, the low-temperature low-pressure liquid is changed into low-temperature low-pressure gas, and the low-temperature low-pressure gas returns to the compressor 140 for the next cycle.
In the use process of the existing variable frequency air conditioner device 100, the variable frequency air conditioner adopting the direct current motor for the outdoor unit can improve the APF by reducing the rotating speed of the fan outside the intermediate frequency test mode, but for the alternating current fan adopting the single-gear rotating speed, the efficiency of the air conditioner is low due to the fact that the rotating speed of the fan cannot be adjusted, and the APF cannot pass the test. In order to solve this problem, in the inverter air conditioner control device 100 of this embodiment, the operating state of the external fan 130 is changed, so as to reduce the energy consumption of the air conditioner and improve the energy efficiency, thereby meeting the requirements of the APF test.
Example 1
As shown in fig. 2, after the inverter air conditioner is turned on, the external fan 130 performs a periodic power on/off operation to control the rotation speed as long as the test mode is entered. As shown in fig. 3, specifically:
s11, starting the variable frequency air conditioner;
s12, driving the variable frequency air conditioner to operate in a test mode;
s13, the outer fan 130 executes a preset cycle operation mode.
Wherein the process of the external fan 130 executing the preset periodic operation mode includes:
s131, starting the outer fan 130, driving the rotating speed of the outer fan 130 to reach a first rated rotating speed and operating for a first time period;
and S132, turning off the outer fan 130, and operating for a second time period, wherein during the period of turning off the outer fan 130, the outer fan is reduced by means of inertia rotating speed, a second rated rotating speed is set before the outer fan 130 is completely static, and the outer fan 130 is restarted to operate for the first time period when the rotating speed of the outer fan 130 is reduced to the second rated rotating speed.
The sum of the specific first duration and the specific second duration is a preset period of the outer fan 130.
When the outer fan 130 is in the starting stage, the fan rotates continuously, the average power consumed is high, and the energy efficiency is low; when the external fan 130 is in the off stage, the heat exchange efficiency of the outdoor heat exchanger 110 is reduced, the average power consumption is also reduced, and the corresponding energy efficiency is improved. Therefore, the rotation speed of the external fan 130 can be effectively controlled when the external fan is repeatedly turned on and off in a preset period, and the APF energy efficiency of the variable frequency air conditioner is effectively improved.
Example 2
An external coil temperature detector 120 is connected to the outdoor heat exchanger 110. The outer fan 130 is disposed inside the outdoor unit to generate an air current for heat exchange with the outdoor heat exchanger 110, and the outer fan 130 is further disposed to be at a temperature T of the outdoor coilOuter plateGreater than a predetermined temperature threshold T1And executing a preset period operation mode.
The temperature of the outdoor coil during the preset periodic mode of operation of the external fan 130TOuter plateLess than a predetermined temperature threshold T2And the external fan 130 is turned off when the turn-on time reaches a first rated time and is turned on again when the turn-off time reaches a second rated time, and the sum of the first rated time and the second rated time is a preset period of the external fan 130.
The first rated time is based on the outdoor coil temperature TOuter plateWith a predetermined temperature threshold T1And T2Is set, the second rated time is set according to the temperature T of the outdoor coilOuter plateWith a predetermined temperature threshold T2The difference value of (c) is set. Particularly according to the outdoor coil temperature TOuter plateWith a predetermined temperature threshold T1And T2The difference value of the first rated time and the second rated time is correspondingly adjusted, and the temperature T of the outdoor coil pipe is adjustedOuter plateWith a predetermined temperature threshold T1When the difference is larger, the ratio of the first rated time to the second rated time is increased, that is, the on time of the outer fan 130 is prolonged while the off time of the outer fan 130 is relatively shortened, so as to rapidly reduce the outdoor coil temperature TOuter plate(ii) a At outdoor coil temperature TOuter plateWith a predetermined temperature threshold T1When the difference is smaller, the ratio of the first rated time to the second rated time is reduced, that is, the off time of the outer fan 130 is prolonged while the on time of the outer fan 130 is relatively shortened, so as to slow down the outdoor coil temperature TOuter plateIs reduced.
In addition, during the APF energy efficiency test, if the outdoor coil temperature T is detectedOuter plateNot greater than a preset temperature threshold T1In this case, the open state of the outer fan 130 is maintained.
As shown in fig. 4, the control method of the present embodiment may specifically include:
s21, starting the variable frequency air conditioner;
s22, driving the variable frequency air conditioner to operate in a test mode;
s23, detecting and judging the temperature T of the outer coil of the outdoor heat exchanger of the variable frequency air conditionerOuter plateWhether it is greater than a preset temperature threshold T1；
In step S23, outdoor heat exchange is detected by the outdoor coil temperature detector 120Outside coil temperature T of vessel 110Outer plateAnd judging the outdoor coil temperature TOuter plateWhether it is greater than a preset temperature threshold T1(ii) a The external coil temperature detector 120 may be a temperature sensor provided on the outdoor heat exchanger 110; in addition, the preset temperature threshold T1Can be set according to the working condition of the control device 100 of the inverter air conditioner to select the temperature T of the outdoor coil pipe which can meet the stable operation of the inverter air conditionerOuter plateIn this embodiment, the temperature threshold T is preset1The setting was 66 ℃.
In step S24, if the determination result in step S23 is yes, the preset period operation mode is executed on the external fan 130 of the inverter air conditioner control device 100.
In step S25, if the determination result in step S23 is negative, the outer fan 130 is driven to keep the continuous on state.
Specifically, as shown in fig. 5, the step of the outer fan performing the preset periodic operation mode includes:
s241, starting the outer fan and continuing for a first rated time;
s242, detecting and judging the temperature T of the outer coil of the outdoor heat exchanger of the variable frequency air conditionerOuter plateWhether it is less than a preset temperature threshold T2；
If the determination result in the step S242 in S243 is yes, the temperature T of the external coil pipe isOuter plateLess than a predetermined temperature threshold T2Closing the outer fan and continuing for a second rated time;
if the determination result in the step S242 in S244 is negative, the temperature T of the external coil is determinedOuter plateNot less than a predetermined temperature threshold T2The outer fan lasts for a first rated time. In this embodiment, a temperature threshold T is preset2Set at 52 deg.c.
To sum up, when the external fan 130 is in the start stage, the fan rotates continuously, the average power consumed is high, and the energy efficiency is low; when the external fan 130 is in the off stage, the heat exchange efficiency of the outdoor heat exchanger 110 is reduced, the average power consumption is also reduced, and the corresponding energy efficiency is improved. Therefore, by using the control method of the embodiment, when the external fan 130 executes the preset period operation, the continuous temperature rise of the outdoor coil is avoided, the energy consumption in the APF test process is effectively reduced, and the operation stability of the variable frequency air conditioner control device is improved.
Example 3
In order to supplement the description of the control apparatus and the control method of the variable frequency air conditioner of the present invention, in this embodiment, on the basis of embodiment 1 and embodiment 2, for a specific variable frequency air conditioner, the operation parameters are compared under two conditions that the external fan is kept continuously on and the external fan is repeatedly turned on and off at a preset period, as shown in fig. 6:
in fig. 6, a curve 61 is a time-dependent power variation curve of the down-conversion air-conditioning control device 100 in a state where the external fan is kept continuously turned on, where an average power of the down-conversion air-conditioning control device 100 is 1200W; the curve 62 is a time-dependent variation curve of the power of the inverter air-conditioning control device 100 after the control method of the embodiment is executed, and at this time, the average power of the inverter air-conditioning control device 100 is 1080W; curve 63 is the outdoor coil temperature T of the down-conversion air conditioning control unit 100 with the outer fan kept onOuter plateTime-dependent profile of the average outside coil temperature T of the inverter air conditioner control device 100Outer plateIs 51 ℃; curve 64 is the outdoor coil temperature T of the inverter air conditioner control device 100 after the control method of the present embodiment is executedOuter plateThe average outer coil temperature texcan of the variable frequency air conditioner control device 100 at this time is 55 ℃.
As can be seen from the comparison of the curves 61 and 62 and the curves 63 and 64, the average power decreases after the repeated on and off operations of the external fan 130 of the inverter air conditioner control device 100 with the preset period. The energy efficiency of the inverter air conditioner control device 100 is calculated to be increased by about 0.1, and the total APF value is improved by 1.21%.
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 (5)
1. A control method of a variable frequency air conditioner is characterized by comprising the following steps:
starting the variable frequency air conditioner;
driving the variable frequency air conditioner to operate in a test mode;
detecting and judging the temperature T of the outer coil of the outdoor heat exchanger of the variable frequency air conditionerOuter plateWhether it is greater than a preset temperature threshold T1；
When the temperature of an outer coil of the outdoor heat exchanger of the variable frequency air conditioner is greater than a preset temperature threshold value T1, the outer fan executes a preset period operation mode;
temperature T of external coilOuter plateNot greater than a preset temperature threshold T1The external fan keeps a continuous opening state;
the step of the outer fan executing the preset periodic operation mode includes:
starting the outer fan for a first rated time;
detecting and judging the temperature T of the outer coil of the outdoor heat exchanger of the variable frequency air conditionerOuter plateWhether it is less than a preset temperature threshold T2；
Temperature T of external coilOuter plateLess than a predetermined temperature threshold T2Closing the outer fan and continuing for a second rated time;
temperature T of external coilOuter plateNot less than a predetermined temperature threshold T2The outer fan lasts for a first rated time.
2. The method of claim 1, wherein: the first rated time of the outer fan is according to the temperature T of the outer coil pipeOuter plateWith a predetermined temperature threshold T1And T2Setting the difference value of (1); the second rated time of the outer fan is according to the temperature T of the outer coil pipeOuter plateWith a predetermined temperature threshold T2Setting the difference value of (1); and the preset temperature threshold value T1Greater than T2。
3. The method of claim 1, wherein: the sum of the first rated time and the second rated time of the outer fan is a preset period of the outer fan.
4. The method according to any one of claims 1 to 3, wherein the adopted inverter air conditioner control device comprises:
an outdoor heat exchanger;
a temperature detector for detecting the temperature T of the outer coil of the outdoor heat exchangerOuter plate(ii) a And
an outer fan disposed in an outdoor unit of the air conditioner to generate an air flow exchanging heat with the outdoor heat exchanger, and further configured to be at an outer coil temperature T of the outdoor heat exchangerOuter plateGreater than a predetermined temperature threshold T1And the outer fan executes a preset period operation mode.
5. A method according to any one of claims 1 to 3, characterized in that: the external fan sets a preset temperature threshold T within a first rated time in the process of a preset period operation mode2Outside coil temperature TOuter plateLess than a predetermined temperature threshold T2And the outer fan is turned off and is turned on again when the turn-off time reaches a second rated time.
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| CN110762776B (en) * | 2019-11-01 | 2021-11-02 | 重庆海润节能技术股份有限公司 | Wireless sensing controller device and control method |
| CN111023393A (en) * | 2019-11-15 | 2020-04-17 | 宁波奥克斯电气股份有限公司 | Control method and system of outdoor fan and air conditioner |
| CN112984702B (en) * | 2021-03-26 | 2023-01-20 | 广东Tcl智能暖通设备有限公司 | Control method of fixed-frequency air conditioner, fixed-frequency air conditioner and storage medium |
| CN115031391B (en) * | 2022-05-26 | 2023-10-13 | 珠海格力电器股份有限公司 | Air conditioner control method and device, storage medium and electronic equipment |
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