CN112944602A - Control method and device of fixed-frequency air conditioner, storage medium and fixed-frequency air conditioner - Google Patents
Control method and device of fixed-frequency air conditioner, storage medium and fixed-frequency air conditioner Download PDFInfo
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- CN112944602A CN112944602A CN202110157032.2A CN202110157032A CN112944602A CN 112944602 A CN112944602 A CN 112944602A CN 202110157032 A CN202110157032 A CN 202110157032A CN 112944602 A CN112944602 A CN 112944602A
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/49—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring ensuring correct operation, e.g. by trial operation or configuration checks
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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
- F24F11/64—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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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Abstract
The invention provides a control method and a control device of a fixed-frequency air conditioner, a storage medium and the fixed-frequency air conditioner, wherein the method comprises the following steps: after the air conditioner is started, collecting the current value and the exhaust temperature of a compressor of the air conditioner within preset time; determining a corresponding judgment value according to the collected current value and the collected exhaust temperature, and comparing the judgment value with a preset regulation threshold value; and adjusting the rotating speed of a motor of the indoor unit and/or the on-off state of a motor of the outdoor unit according to the comparison result of the judgment value and the preset adjusting threshold value. The scheme provided by the invention can reduce the pressure and the temperature of the low-pressure side, thereby achieving the purpose of reducing the high-pressure and the exhaust temperature of the outdoor unit.
Description
Technical Field
The invention relates to the field of control, in particular to a control method and device of a fixed-frequency air conditioner, a storage medium and the fixed-frequency air conditioner.
Background
In the global market, for the regions and countries with underdeveloped economy, the household air conditioner is oriented to the price, and the fixed-frequency air conditioner still occupies the mainstream position of the market. The situation that the installation environment of the air conditioner is severe exists in the countries, the middle east market is listed, the air conditioner outdoor unit is often installed on the roof, the outdoor unit is influenced by direct solar radiation in summer, and the operating environment temperature of the air conditioner outdoor unit can reach 58 ℃; the temperature of the roof can reach more than 25 ℃ in winter, but the room temperature is only 10 ℃, and air-conditioning heating is still needed at the moment. When the temperature of the outer ring is high, the air conditioner refrigerates or heats, and the load of the system is extremely large.
Different from the frequency converter, the fixed frequency machine cannot reduce the system load by reducing the running frequency of the compressor, when the load is too large to bear by the air conditioner, the compressor can be shut down through self mechanical overload protection, and the indoor unit of the air conditioner has no refrigerating or heating capacity. However, if the overload protection of the compressor is removed or the threshold value of the overload protection action is greatly increased, the compressor is damaged in long-term high-load operation, so that the service life of the air conditioner is shortened, and safety accidents are also caused. Therefore, in a high-temperature environment, it becomes especially important to provide certain capability without losing the reliability of the air conditioner.
Disclosure of Invention
The present invention is mainly intended to overcome the defects of the prior art, and provides a control method and device for a fixed-frequency air conditioner, a storage medium and a fixed-frequency air conditioner, so as to solve the problem that when the fixed-frequency air conditioner operates in a high-temperature environment, an outdoor unit frequently stops to cause no cooling or heating effect of an indoor unit in the prior art.
The invention provides a control method of a fixed-frequency air conditioner, which comprises the following steps: after the air conditioner is started, collecting the current value and the exhaust temperature of a compressor of the air conditioner within preset time; determining a corresponding judgment value according to the collected current value and the collected exhaust temperature, and comparing the judgment value with a preset regulation threshold value; and adjusting the rotating speed of a motor of the indoor unit and/or the on-off state of a motor of the outdoor unit according to the comparison result of the judgment value and the preset adjusting threshold value.
Optionally, determining a corresponding determination value according to the collected current value and the collected exhaust temperature, and comparing the determination value with a preset adjustment threshold value, including: determining a position in a coordinate system as a determination value by taking the current value as an abscissa and the exhaust temperature as an ordinate; determining a comparison result of the judgment value and the preset adjusting threshold according to the area of the position in the coordinate system; the preset adjusting threshold value comprises preset adjusting threshold value curves corresponding to different compressor current values and exhaust temperatures; the coordinate system is divided into at least two regions by the preset adjustment threshold curve.
Optionally, in the case of the air conditioner operating in the cooling mode, the preset adjustment threshold curve includes a first adjustment threshold curve and a second adjustment threshold curve; determining a comparison result between the judgment value and the preset adjustment threshold according to the area of the position in the coordinate system, wherein the comparison result comprises the following steps: when the position is on a first adjustment threshold curve or outside an area between the first adjustment threshold curve and a coordinate axis, judging that the judgment value is greater than or equal to a first adjustment threshold; when the position is on the second adjustment threshold curve or in a region between the first adjustment threshold curve and the second adjustment threshold curve, determining that the determination value is smaller than the first adjustment threshold and equal to or larger than the second adjustment threshold; when the position is in an area formed by a second adjusting threshold curve and a coordinate axis, judging that the judgment value is smaller than a second adjusting threshold; and/or, under the condition that the air conditioner operates in a heating mode, the preset adjusting threshold curve comprises a third adjusting threshold curve; determining a comparison result between the judgment value and the preset adjustment threshold according to the area of the position in the coordinate system, wherein the comparison result comprises the following steps: when the position is on a third adjustment threshold curve or in an area between the third adjustment threshold curve and a coordinate axis, judging that the judgment value is less than or equal to a third adjustment threshold; when the position is outside the region between the third adjustment threshold value curve and the coordinate axis, it is determined that the determination value is larger than the third adjustment threshold value.
Optionally, adjusting the rotation speed of the motor of the indoor unit and/or the on-off state of the motor of the outdoor unit according to the comparison result between the determination value and the preset adjustment threshold includes: under the condition that the air conditioner operates in a cooling mode, the preset adjusting threshold value comprises a first adjusting threshold value and a second adjusting threshold value; if the judgment value is larger than or equal to a first adjusting threshold value, reducing the rotating speed of a motor of the indoor unit; if the judgment value is smaller than a first regulation threshold and larger than or equal to a second regulation threshold, maintaining the current motor rotating speed of the indoor unit; if the judgment value is smaller than a second regulation threshold value, operating according to the current set state; and/or, under the condition that the air conditioner operates in a heating mode, the preset adjusting threshold comprises a third adjusting threshold; if the judgment value is larger than a third regulation threshold value, a motor of the outdoor unit is closed; and if the judgment value is less than or equal to a third regulation threshold value, starting a motor of the outdoor unit.
Another aspect of the present invention provides a control apparatus for a fixed-frequency air conditioner, including: the collecting unit is used for collecting the current value and the exhaust temperature of a compressor of the air conditioner within preset time after the air conditioner is started; the comparison unit is used for determining a corresponding judgment value according to the current value and the exhaust temperature acquired by the acquisition unit and comparing the judgment value with a preset adjustment threshold value; and the adjusting unit is used for adjusting the rotating speed of a motor of the indoor unit and/or the on-off state of a motor of the outdoor unit according to the comparison result of the judging value and the preset adjusting threshold value.
Optionally, the comparing unit determines a corresponding determination value according to the current value and the exhaust temperature collected by the collecting unit, and compares the determination value with a preset adjustment threshold, and includes: determining a position in a coordinate system as a determination value by taking the current value as an abscissa and the exhaust temperature as an ordinate; determining a comparison result of the judgment value and the preset adjusting threshold according to the area of the position in the coordinate system; the preset adjusting threshold value comprises preset adjusting threshold value curves corresponding to different compressor current values and exhaust temperatures; the coordinate system is divided into at least two regions by the preset adjustment threshold curve.
Optionally, in the case of the air conditioner operating in the cooling mode, the preset adjustment threshold curve includes a first adjustment threshold curve and a second adjustment threshold curve; the comparison unit determines a comparison result between the judgment value and the preset adjustment threshold according to the area of the position in the coordinate system, and comprises: when the position is on a first adjustment threshold curve or outside an area between the first adjustment threshold curve and a coordinate axis, judging that the judgment value is greater than or equal to a first adjustment threshold; when the position is on the second adjustment threshold curve or in a region between the first adjustment threshold curve and the second adjustment threshold curve, determining that the determination value is smaller than the first adjustment threshold and equal to or larger than the second adjustment threshold; when the position is in an area formed by a second adjusting threshold curve and a coordinate axis, judging that the judgment value is smaller than a second adjusting threshold; and/or, under the condition that the air conditioner operates in a heating mode, the preset adjusting threshold curve comprises a third adjusting threshold curve; the comparison unit determines a comparison result between the judgment value and the preset adjustment threshold according to the area of the position in the coordinate system, and comprises: when the position is on a third adjustment threshold curve or in an area between the third adjustment threshold curve and a coordinate axis, judging that the judgment value is less than or equal to a third adjustment threshold; when the position is outside the region between the third adjustment threshold value curve and the coordinate axis, it is determined that the determination value is larger than the third adjustment threshold value.
Optionally, the adjusting unit adjusts the rotation speed of the motor of the indoor unit and/or the on-off state of the motor of the outdoor unit according to the comparison result between the determination value and the preset adjustment threshold, and includes: under the condition that the air conditioner operates in a cooling mode, the preset adjusting threshold value comprises a first adjusting threshold value and a second adjusting threshold value; if the judgment value is larger than or equal to a first adjusting threshold value, reducing the rotating speed of a motor of the indoor unit; if the judgment value is smaller than a first regulation threshold and larger than or equal to a second regulation threshold, maintaining the current motor rotating speed of the indoor unit; if the judgment value is smaller than a second regulation threshold value, operating according to the current set state; and/or, under the condition that the air conditioner operates in a heating mode, the preset adjusting threshold comprises a third adjusting threshold; if the judgment value is larger than a third regulation threshold value, a motor of the outdoor unit is closed; and if the judgment value is less than or equal to a third regulation threshold value, starting a motor of the outdoor unit.
A further aspect of the invention provides a storage medium having stored thereon a computer program which, when executed by a processor, carries out the steps of any of the methods described above.
In yet another aspect, the present invention provides a fixed-frequency air conditioner, which includes a processor, a memory, and a computer program stored in the memory and operable on the processor, wherein the processor implements the steps of any one of the methods when executing the computer program.
The invention further provides a fixed-frequency air conditioner which comprises the control device of the fixed-frequency air conditioner.
According to the technical scheme of the invention, a judgment value is determined according to the current value and the exhaust temperature of the compressor and compared with a preset regulation threshold value, and the motor rotating speed of the indoor unit and/or the on-off state of the outdoor unit motor are/is adjusted according to the comparison result; when the air conditioner refrigerates in a high-temperature environment, the rotating speed of a motor of the indoor unit is reduced to reduce the pressure and the temperature of a low-pressure side, so that the purposes of reducing the high-pressure and the exhaust temperature (or the temperature of a compressor winding) of the outdoor unit are achieved, the overload protection shutdown is avoided, and the operation reliability is improved; at the moment, the current parameter is also reduced when the system pressure is reduced, the exhaust temperature is reduced and is lower than the threshold value for triggering overload protection, and the air conditioner can normally run. When the air conditioner is used for heating in a high-temperature environment, the pressure and the temperature of the outdoor unit are reduced by setting the outdoor unit to be a low-pressure side and the indoor unit to be a high-pressure side.
The air conditioner can normally operate in a high-temperature environment when no other faults exist, and the condition that the indoor unit has no refrigerating or heating effect due to frequent shutdown of the outdoor unit is avoided. The compressor can normally enter overload protection shutdown. The invention replaces the temperature with the exhaust temperature, changes the pressure and temperature of the low-pressure side, and realizes the temperature measurement by controlling the rotating speed of the motor of the indoor unit and the on/off of the motor of the outdoor unit. Because the refrigerant of the low-pressure side heat exchanger absorbs the heat of the environment space through the evaporation effect, when the rotating speed of the motor is reduced or the motor is stopped, the air volume is visually reduced or not reduced, the evaporation temperature of the refrigerant is reduced, the corresponding saturation pressure is reduced, and the effect of reducing the temperature and the pressure of the low-pressure side is achieved.
The control scheme of the invention can not shield the overload protection of the compressor, for example, when the power supply voltage is abnormal, the air inlet of the air conditioner is blocked, so that the current of the system is increased instantly or the temperature is increased sharply and violently, the overload protection still acts.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic method diagram illustrating an embodiment of a method for controlling a fixed-frequency air conditioner according to the present invention;
FIG. 2 shows a system control diagram of the present invention;
FIG. 3a is a schematic diagram of a first adjustment threshold curve and a second adjustment threshold curve for the case of air conditioning operation in a cooling mode;
FIG. 3b is a schematic diagram of a third adjustment threshold curve for the case of air conditioning operation in a heating mode;
FIG. 4 is a schematic method diagram illustrating an embodiment of a method for controlling a fixed-frequency air conditioner according to the present invention;
fig. 5 is a block diagram of a control device of a fixed-frequency air conditioner according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a schematic method diagram of an embodiment of a control method of a fixed-frequency air conditioner according to the present invention.
As shown in fig. 1, according to an embodiment of the present invention, the control method includes at least step S110, step S120, and step S130.
And step S110, collecting the current value and the exhaust temperature of the compressor of the air conditioner within preset time after the air conditioner is started.
Optionally, after the air conditioner is turned on, the operation mode is determined, for example, whether to enter a cooling mode or a heating mode is determined. After the operation mode is judged, if the air conditioner is judged to enter the cooling mode, the current value A1 and the exhaust temperature T1 of the compressor of the air conditioner are collected within the preset time delta T, and if the air conditioner is judged to enter the heating mode, the current value A2 and the exhaust temperature T2 of the compressor of the air conditioner are collected within the preset time delta T. Fig. 2 shows a system control diagram of the present invention.
Alternatively, the current value of the compressor may be replaced with a high pressure (discharge pressure) value. Detecting high pressure (namely exhaust pressure), and testing the variation relation of the high pressure and current in advance so as to convert the detected high pressure into the current value of the compressor.
And step S120, determining a corresponding judgment value according to the collected current value and the collected exhaust temperature, and comparing the judgment value with a preset regulation threshold value.
In some embodiments, a position in a coordinate system is determined as a determination value with the current value as an abscissa and the exhaust temperature as an ordinate; and determining a comparison result between the judgment value and the preset adjusting threshold according to the area of the position in the coordinate system.
The preset adjusting threshold value comprises different compressor current values and preset adjusting threshold value curves corresponding to the exhaust temperature. The coordinate system is divided into at least two regions by the preset adjustment threshold curve.
Specifically, in the case of the air-conditioning operation cooling mode, the preset adjustment threshold includes a first adjustment threshold P1 and a second adjustment threshold P2; the second regulation threshold P2 is less than the first regulation threshold P1 is less than the lower threshold of compressor overload protection action (as shown in fig. 3 a), and different compressor current values and discharge temperatures correspond to different first regulation threshold curves (refer to the curve of regulation threshold P1 in fig. 3 a) and second regulation threshold curves (refer to the curve of regulation threshold P2 in fig. 3 a). The preset adjusting threshold value curve comprises a first adjusting threshold value curve and a second adjusting threshold value curve; the coordinate system is divided into three regions by a first adjustment threshold curve and a second adjustment threshold curve.
When the position is on the first adjustment threshold curve or outside the region between the first adjustment threshold curve and the coordinate axis, determining that the determination value is equal to or greater than the first adjustment threshold P1; when the position is on the second adjustment threshold curve or in a region between the first adjustment threshold curve and the second adjustment threshold curve, it is determined that the determination value is less than the first adjustment threshold P1 and equal to or greater than the second adjustment threshold P2; when the position is in a region where the second adjustment threshold curve and the coordinate axis form, it is determined that the determination value is smaller than the second adjustment threshold P2.
Fig. 3a is a schematic diagram of a first adjustment threshold curve and a second adjustment threshold curve in the case of the cooling mode of air-conditioning operation. As shown in fig. 3a, the current value a1 is used as an abscissa and the exhaust temperature T1 is used as an ordinate, and the collected current value a1 and exhaust temperature T1 are substituted into the coordinates to obtain a determination value (position), and the determination value, the first adjustment threshold P1 and the second adjustment threshold P2 are determined according to the region in which the determination value is located. When the position is on the first adjustment threshold curve (the curve of the adjustment threshold P1) or outside the region between the first adjustment threshold curve and the coordinate axis, the determination value is ≧ P1; when the position is on the second adjustment threshold curve (the curve of the adjustment threshold P2) or in the region between the first adjustment threshold curve and the second adjustment threshold curve, P2 ≦ determination value < P1; when the position is in a region where the second adjustment threshold curve and the coordinate axis form, the determination value < P2.
In the case of the air conditioner operating in the heating mode, the preset adjustment threshold includes a third adjustment threshold P3; the third adjustment threshold P3 is less than the lower threshold of compressor overload protection action (as shown in fig. 3 b). Different compressor current values and discharge temperatures correspond to different third adjustment threshold curves. The coordinate system is divided into two regions by a third adjustment threshold curve.
When the position is on the third adjustment threshold curve or in a region between the third adjustment threshold curve and the coordinate axis, determining that the determination value is equal to or less than a third adjustment threshold P3; when the position is outside the region between the third adjustment threshold curve and the coordinate axis, it is determined that the determination value is larger than the third adjustment threshold P3.
Fig. 3b is a schematic diagram of a third adjustment threshold curve in the case of the air-conditioning operation heating mode. As shown in fig. 3b, the current value a2 is plotted on the abscissa and the exhaust temperature T2 is plotted on the ordinate, and the collected current value a2 and exhaust temperature T2 are substituted into the coordinates to obtain a determination value (position), and the determination value and the third adjustment threshold P3 are determined based on the region in which the determination value is located. When the position is on the third adjustment threshold curve (the curve of the adjustment threshold P3) or in the region between the third adjustment threshold curve and the coordinate axis, the determination value is ≦ P3; when the position is outside the region between the third adjustment threshold curve and the coordinate axis, the determination value > P3.
And step S130, adjusting the rotating speed of a motor of the indoor unit and/or the on-off state of a motor of the outdoor unit according to the comparison result of the judgment value and the preset adjusting threshold value.
In some embodiments, in the case of the air-conditioning operation cooling mode, the preset adjustment threshold includes a first adjustment threshold P1 and a second adjustment threshold P2; if the judgment value is larger than or equal to a first adjusting threshold value P1, reducing the motor speed of the indoor unit; if the judgment value is smaller than a first adjusting threshold value P1 and is larger than or equal to a second adjusting threshold value P2, maintaining the current motor speed of the indoor unit; if the determination value is less than or equal to a second adjustment threshold P2, operating according to a current setting state (for example, operating according to a state set by a remote controller), wherein if the determination value is greater than or equal to a first adjustment threshold P1, after reducing the motor rotation speed of the indoor unit, determining again that the determination value is greater than or equal to the first adjustment threshold P1, if the determination value is greater than or equal to a first adjustment threshold P1, reducing again the motor rotation speed of the indoor unit until the determination value is less than or equal to the first adjustment threshold P1, further determining whether the determination value is less than a first adjustment threshold P1 and greater than or equal to a second adjustment threshold P2, if the determination value is less than a first adjustment threshold P1 and greater than or equal to a second adjustment threshold P2, maintaining the current motor rotation speed of the indoor unit until the determination value is less than a second adjustment threshold P2; and if the judgment value is smaller than a second adjusting threshold value P2, operating according to the current set state.
If the determination value is greater than or equal to P1, the motor speed of the indoor unit is reduced, for example, the motor gear is adjusted from high to low. If the regulated judgment value is still judged to be more than or equal to P1, the rotating speed of the motor of the indoor unit is continuously reduced until the judgment value is less than P1; if the judgment value is less than P1, judging whether the judgment value is more than or equal to P2 and less than P1, if the judgment value is more than or equal to P2 and less than P1, maintaining the original state to operate, and not adjusting the rotating speed of the motor of the indoor unit until the judgment value is less than P2; if the determination value is < P2, the control mode is exited and the device is operated in accordance with the current setting, for example, the setting of the remote controller.
In the above embodiment, the current motor speed of the indoor unit is maintained (the motor speed of the indoor unit is not adjusted), which means that the air conditioner is still in the control mode of the present invention, and the motor speed is adjusted or adjusted to stabilize the cooling operation (the compressor is overloaded and not operated), and the user remote controller cannot function. The operation according to the current set state, for example, the state set by the remote controller, represents that the control mode of the invention can be exited at this time, and the control right of the user to the air conditioner windshield is restored.
Under the condition that the air conditioner operates in a heating mode, the preset adjusting threshold comprises a third adjusting threshold; if the judgment value is larger than a third regulation threshold value, a motor of the outdoor unit is closed; and if the judgment value is less than or equal to a third regulation threshold value, starting a motor of the outdoor unit.
If the judgment value is larger than P3, the motor of the outdoor unit is closed, and data is still acquired within the time delta T after the motor is closed to judge again; and if the judgment value is less than or equal to P3, starting a motor of the outdoor unit.
The overload protection of the compressor is a mechanical physical protection action of the compressor, the compressor is provided with an internal or external overload protector, the overload protector is triggered to act by the current and the temperature of the compressor, and the compressor is immediately stopped by triggering action. The overload protection is not affected by the program, but can be detected by the program, and the overload protection can be triggered as long as the lower limit condition of the overload protection action of the compressor is met in the operation of the air conditioner. According to the embodiment of the invention, the overload protection of the compressor can not be shielded, and when the power supply voltage is abnormal and the air inlet of the air conditioner is blocked, the current of the system is increased instantly or the temperature is increased rapidly, the overload protection can still be triggered to stop after the control mode is entered.
In order to clearly illustrate the technical solution of the present invention, the following describes an execution flow of the control method of the fixed-frequency air conditioner according to a specific embodiment of the present invention.
Fig. 4 is a schematic method diagram of a control method of a fixed-frequency air conditioner according to an embodiment of the present invention. As shown in fig. 4, after the air conditioner is turned on, it is determined whether the air conditioner is operated in a cooling mode or a heating mode, and if it is determined that the air conditioner is in the cooling mode, a current value a1 of the compressor and a discharge temperature T1 of the outdoor unit are collected within Δ T time, the data is substituted into a program for calculation, and a calculation result is used as a determination value to be compared with adjustment thresholds P1 and P2. If the judgment value is not less than P1, reducing the motor speed of the indoor unit (the motor gear is adjusted from high to low), and if the judgment value is not less than P1 after adjustment, continuing to reduce the motor speed of the indoor unit until the judgment value is less than P1; if the judgment value is less than P1, judging whether the judgment value is more than or equal to P2 and less than P1, if the judgment value is more than or equal to P2 and less than P1, maintaining the original state for running, and not adjusting the rotating speed of the motor of the indoor unit; if the judgment value is less than P2, the control mode is exited and the operation is performed according to the state set by the user.
If the heating mode is judged to be entered, the current value A2 of the compressor and the exhaust temperature T2 of the outdoor unit are collected within the time delta T, the data are substituted into a program for calculation, and the calculation result is used as a judgment value to be compared with an adjustment threshold value P3. If the judgment value is larger than P3, the motor of the outdoor unit is closed, data are collected again within the time delta T after the motor is closed, and judgment is carried out again; and if the judgment value is less than or equal to P3, starting a motor of the outdoor unit. If the air conditioner is judged to be operated in other modes (non-cooling and heating modes), the control flow is not executed.
Fig. 5 is a block diagram of a control device of a fixed-frequency air conditioner according to an embodiment of the present invention. As shown in fig. 5, the control device 100 includes an acquisition unit 110, a comparison unit 120, and an adjustment unit 130.
The collecting unit 110 is configured to collect a current value and an exhaust temperature of a compressor of the air conditioner within a preset time after the air conditioner is turned on.
Optionally, after the air conditioner is turned on, the operation mode is determined, for example, whether to enter a cooling mode or a heating mode is determined. After the operation mode is determined, if the cooling mode is determined to be entered, the collecting unit 110 collects the current value a1 and the discharge temperature T1 of the compressor of the air conditioner within a preset time Δ T, and if the heating mode is determined to be entered, the collecting unit 110 collects the current value a2 and the discharge temperature T2 of the compressor of the air conditioner within the preset time Δ T.
Alternatively, the current value of the compressor may be replaced with a high pressure (discharge pressure) value. Detecting high pressure (namely exhaust pressure), and testing the variation relation of the high pressure and current in advance so as to convert the detected high pressure into the current value of the compressor.
The comparing unit 120 is configured to determine a corresponding determination value according to the current value and the exhaust temperature collected by the collecting unit 110, and compare the determination value with a preset adjustment threshold.
In some embodiments, the comparison unit 120 determines a position in a coordinate system with the current value as an abscissa and the exhaust temperature as an ordinate as a determination value; and determining a comparison result between the judgment value and the preset adjusting threshold according to the area of the position in the coordinate system.
The preset adjusting threshold value comprises different compressor current values and preset adjusting threshold value curves corresponding to the exhaust temperature. The coordinate system is divided into at least two regions by the preset adjustment threshold curve.
Specifically, in the case of the air-conditioning operation cooling mode, the preset adjustment threshold includes a first adjustment threshold P1 and a second adjustment threshold P2; the second regulation threshold P2 is less than the first regulation threshold P1 is less than the lower threshold of compressor overload protection action (as shown in fig. 3 a), and different compressor current values and discharge temperatures correspond to different first regulation threshold curves (refer to the curve of regulation threshold P1 in fig. 3 a) and second regulation threshold curves (refer to the curve of regulation threshold P2 in fig. 3 a). The preset adjusting threshold value curve comprises a first adjusting threshold value curve and a second adjusting threshold value curve; the coordinate system is divided into three regions by a first adjustment threshold curve and a second adjustment threshold curve.
In the case of the air-conditioning operation cooling mode, the determining, by the comparing unit 120, a comparison result between the determination value and the preset adjustment threshold according to the area of the position in the coordinate system may specifically include: when the position is on the first adjustment threshold curve or outside the region between the first adjustment threshold curve and the coordinate axis, determining that the determination value is equal to or greater than the first adjustment threshold P1; when the position is on the second adjustment threshold curve or in a region between the first adjustment threshold curve and the second adjustment threshold curve, it is determined that the determination value is less than the first adjustment threshold P1 and equal to or greater than the second adjustment threshold P2; when the position is in a region where the second adjustment threshold curve and the coordinate axis form, it is determined that the determination value is smaller than the second adjustment threshold P2.
Fig. 3a is a schematic diagram of a first adjustment threshold curve and a second adjustment threshold curve in the case of the cooling mode of air-conditioning operation. As shown in fig. 3a, the current value a1 is used as an abscissa and the exhaust temperature T1 is used as an ordinate, and the collected current value a1 and exhaust temperature T1 are substituted into the coordinates to obtain a determination value (position), and the determination value, the first adjustment threshold P1 and the second adjustment threshold P2 are determined according to the region in which the determination value is located. When the position is on the first adjustment threshold curve (the curve of the adjustment threshold P1) or outside the region between the first adjustment threshold curve and the coordinate axis, the determination value is ≧ P1; when the position is on the second adjustment threshold curve (the curve of the adjustment threshold P2) or in the region between the first adjustment threshold curve and the second adjustment threshold curve, P2 ≦ determination value < P1; when the position is in a region where the second adjustment threshold curve and the coordinate axis form, the determination value < P2.
In the case of the air conditioner operating in the heating mode, the preset adjustment threshold includes a third adjustment threshold P3; different compressor current values and discharge temperatures correspond to different third adjustment threshold curves. The coordinate system is divided into two regions by a third adjustment threshold curve.
In the case of the air conditioner operating in the heating mode, the determining, by the comparing unit 120, a comparison result between the determination value and the preset adjustment threshold according to the area of the position in the coordinate system may specifically include: when the position is on the third adjustment threshold curve or in a region between the third adjustment threshold curve and the coordinate axis, determining that the determination value is equal to or less than a third adjustment threshold P3; when the position is outside the region between the third adjustment threshold curve and the coordinate axis, it is determined that the determination value is larger than the third adjustment threshold P3.
Fig. 3b is a schematic diagram of a third adjustment threshold curve in the case of the air-conditioning operation heating mode. As shown in fig. 3b, the current value a2 is plotted on the abscissa and the exhaust temperature T2 is plotted on the ordinate, and the collected current value a2 and exhaust temperature T2 are substituted into the coordinates to obtain a determination value (position), and the determination value and the third adjustment threshold P3 are determined based on the region in which the determination value is located. When the position is on the third adjustment threshold curve (the curve of the adjustment threshold P3) or in the region between the third adjustment threshold curve and the coordinate axis, the determination value is ≦ P3; when the position is outside the region between the third adjustment threshold curve and the coordinate axis, the determination value > P3.
The adjusting unit 130 is configured to adjust a rotation speed of a motor of the indoor unit and/or an on-off state of a motor of the outdoor unit according to a comparison result between the determination value and the preset adjustment threshold.
In some embodiments, in the case of the air-conditioning operation cooling mode, the preset adjustment threshold includes a first adjustment threshold P1 and a second adjustment threshold P2; if the judgment value is larger than or equal to a first adjusting threshold value P1, reducing the motor speed of the indoor unit; if the judgment value is smaller than a first adjusting threshold value P1 and is larger than or equal to a second adjusting threshold value P2, maintaining the current motor speed of the indoor unit; if the determination value is less than or equal to a second adjustment threshold P2, operating according to a current setting state (for example, operating according to a state set by a remote controller), wherein if the determination value is greater than or equal to a first adjustment threshold P1, after reducing the motor rotation speed of the indoor unit, determining again that the determination value is greater than or equal to the first adjustment threshold P1, if the determination value is greater than or equal to a first adjustment threshold P1, reducing again the motor rotation speed of the indoor unit until the determination value is less than or equal to the first adjustment threshold P1, further determining whether the determination value is less than a first adjustment threshold P1 and greater than or equal to a second adjustment threshold P2, if the determination value is less than a first adjustment threshold P1 and greater than or equal to a second adjustment threshold P2, maintaining the current motor rotation speed of the indoor unit until the determination value is less than a second adjustment threshold P2; and if the judgment value is smaller than a second adjusting threshold value P2, operating according to the current set state.
Specifically, if the determination value is equal to or greater than P1, the motor speed of the indoor unit is reduced, and the motor gear is adjusted from high to low, for example. If the regulated judgment value is still judged to be more than or equal to P1, the rotating speed of the motor of the indoor unit is continuously reduced until the judgment value is less than P1; if the judgment value is less than P1, judging whether the judgment value is more than or equal to P2 and less than P1, if the judgment value is more than or equal to P2 and less than P1, maintaining the original state to operate, and not adjusting the rotating speed of the motor of the indoor unit until the judgment value is less than P2; if the determination value is < P2, the control mode is exited and the device is operated in accordance with the current setting, for example, the setting of the remote controller.
In the above embodiment, the current motor speed of the indoor unit is maintained (the motor speed of the indoor unit is not adjusted), which means that the air conditioner is still in the control mode of the present invention, and the motor speed is adjusted or adjusted to stabilize the cooling operation (the compressor is overloaded and not operated), and the user remote controller cannot function. The operation according to the current set state, for example, the state set by the remote controller, represents that the control mode of the invention can be exited at this time, and the control right of the user to the air conditioner windshield is restored.
In some embodiments, in the case that the air conditioner operates in the heating mode, the preset adjustment threshold includes a third adjustment threshold P3; the third adjustment threshold P3 is less than the lower threshold of compressor overload protection action (as shown in fig. 3 b). If the judgment value is larger than a third regulation threshold value, a motor of the outdoor unit is closed; and if the judgment value is less than or equal to a third regulation threshold value, starting a motor of the outdoor unit.
Specifically, if the judgment value is greater than P3, the motor of the outdoor unit is closed, and data still collected within the time delta T after the motor is closed is judged again; and if the judgment value is less than or equal to P3, starting a motor of the outdoor unit.
The present invention also provides a storage medium corresponding to the control method of the fixed-frequency air conditioner, on which a computer program is stored, which when executed by a processor implements the steps of any of the aforementioned methods.
The invention also provides a fixed-frequency air conditioner corresponding to the control method of the fixed-frequency air conditioner, which comprises a processor, a memory and a computer program which is stored in the memory and can run on the processor, wherein the processor realizes the steps of any one of the methods when executing the program.
The invention also provides a fixed-frequency air conditioner corresponding to the control device of the fixed-frequency air conditioner, which comprises any one of the control devices of the fixed-frequency air conditioner.
According to the scheme provided by the invention, the judgment value is determined according to the current value and the exhaust temperature of the compressor and compared with the preset regulation threshold value, and the motor rotating speed of the indoor unit and/or the on-off state of the outdoor unit motor are/is adjusted according to the comparison result; when the air conditioner refrigerates in a high-temperature environment, the rotating speed of a motor of the indoor unit is reduced to reduce the pressure and the temperature of a low-pressure side, so that the purposes of reducing the high-pressure and the exhaust temperature (or the temperature of a compressor winding) of the outdoor unit are achieved, the overload protection shutdown is avoided, and the operation reliability is improved; at the moment, the current parameter is also reduced when the system pressure is reduced, the exhaust temperature is reduced and is lower than the threshold value for triggering overload protection, and the air conditioner can normally run. When the air conditioner is used for heating in a high-temperature environment, the pressure and the temperature of the outdoor unit are reduced by setting the outdoor unit to be a low-pressure side and the indoor unit to be a high-pressure side.
The air conditioner can normally operate in a high-temperature environment when no other faults exist, and the condition that the indoor unit has no refrigerating or heating effect due to frequent shutdown of the outdoor unit is avoided. The compressor can normally enter overload protection shutdown. The invention replaces the temperature with the exhaust temperature, changes the pressure and temperature of the low-pressure side, and realizes the temperature measurement by controlling the rotating speed of the motor of the indoor unit and the on/off of the motor of the outdoor unit. Because the refrigerant of the low-pressure side heat exchanger absorbs the heat of the environment space through the evaporation effect, when the rotating speed of the motor is reduced or the motor is stopped, the air volume is visually reduced or not reduced, the evaporation temperature of the refrigerant is reduced, the corresponding saturation pressure is reduced, and the effect of reducing the temperature and the pressure of the low-pressure side is achieved.
The control scheme of the invention can not shield the overload protection of the compressor, for example, when the power supply voltage is abnormal, the air inlet of the air conditioner is blocked, so that the current of the system is increased instantly or the temperature is increased sharply and violently, the overload protection still acts.
The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope and spirit of the invention and the following claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hardwired, or a combination of any of these. In addition, each functional unit may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and the parts serving as the control device may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (10)
1. A control method of a fixed-frequency air conditioner is characterized by comprising the following steps:
after the air conditioner is started, collecting the current value and the exhaust temperature of a compressor of the air conditioner within preset time;
determining a corresponding judgment value according to the collected current value and the collected exhaust temperature, and comparing the judgment value with a preset regulation threshold value;
and adjusting the rotating speed of a motor of the indoor unit and/or the on-off state of a motor of the outdoor unit according to the comparison result of the judgment value and the preset adjusting threshold value.
2. The method according to claim 1, wherein determining a corresponding determination value according to the collected current value and the exhaust temperature, and comparing with a preset regulation threshold value comprises:
determining a position in a coordinate system as a determination value by taking the current value as an abscissa and the exhaust temperature as an ordinate;
determining a comparison result of the judgment value and the preset adjusting threshold according to the area of the position in the coordinate system;
the preset adjusting threshold value comprises preset adjusting threshold value curves corresponding to different compressor current values and exhaust temperatures; the coordinate system is divided into at least two regions by the preset adjustment threshold curve.
3. The method of claim 2,
under the condition that the air conditioner operates in a refrigeration mode, the preset adjusting threshold value curve comprises a first adjusting threshold value curve and a second adjusting threshold value curve; determining a comparison result between the judgment value and the preset adjustment threshold according to the area of the position in the coordinate system, wherein the comparison result comprises the following steps:
when the position is on a first adjustment threshold curve or outside an area between the first adjustment threshold curve and a coordinate axis, judging that the judgment value is greater than or equal to a first adjustment threshold;
when the position is on the second adjustment threshold curve or in a region between the first adjustment threshold curve and the second adjustment threshold curve, determining that the determination value is smaller than the first adjustment threshold and equal to or larger than the second adjustment threshold;
when the position is in an area formed by a second adjusting threshold curve and a coordinate axis, judging that the judgment value is smaller than a second adjusting threshold;
and/or the presence of a gas in the gas,
under the condition that the air conditioner operates in a heating mode, the preset adjusting threshold curve comprises a third adjusting threshold curve; determining a comparison result between the judgment value and the preset adjustment threshold according to the area of the position in the coordinate system, wherein the comparison result comprises the following steps:
when the position is on a third adjustment threshold curve or in an area between the third adjustment threshold curve and a coordinate axis, judging that the judgment value is less than or equal to a third adjustment threshold;
when the position is outside the region between the third adjustment threshold value curve and the coordinate axis, it is determined that the determination value is larger than the third adjustment threshold value.
4. The method as claimed in any one of claims 1 to 3, wherein adjusting the rotation speed of the motor of the indoor unit and/or the on/off state of the motor of the outdoor unit according to the comparison result between the determination value and the preset adjustment threshold comprises:
under the condition that the air conditioner operates in a cooling mode, the preset adjusting threshold value comprises a first adjusting threshold value and a second adjusting threshold value;
if the judgment value is larger than or equal to a first adjusting threshold value, reducing the rotating speed of a motor of the indoor unit; if the judgment value is smaller than a first regulation threshold and larger than or equal to a second regulation threshold, maintaining the current motor rotating speed of the indoor unit; if the judgment value is smaller than a second regulation threshold value, operating according to the current set state;
and/or the presence of a gas in the gas,
under the condition that the air conditioner operates in a heating mode, the preset adjusting threshold comprises a third adjusting threshold;
if the judgment value is larger than a third regulation threshold value, a motor of the outdoor unit is closed; and if the judgment value is less than or equal to a third regulation threshold value, starting a motor of the outdoor unit.
5. A control device of a fixed-frequency air conditioner is characterized by comprising:
the collecting unit is used for collecting the current value and the exhaust temperature of a compressor of the air conditioner within preset time after the air conditioner is started;
the comparison unit is used for determining a corresponding judgment value according to the current value and the exhaust temperature acquired by the acquisition unit and comparing the judgment value with a preset adjustment threshold value;
and the adjusting unit is used for adjusting the rotating speed of a motor of the indoor unit and/or the on-off state of a motor of the outdoor unit according to the comparison result of the judging value and the preset adjusting threshold value.
6. The device according to claim 5, wherein the comparing unit determines a corresponding determination value according to the current value and the exhaust temperature collected by the collecting unit, and compares the determination value with a preset adjusting threshold value, and comprises:
determining a position in a coordinate system as a determination value by taking the current value as an abscissa and the exhaust temperature as an ordinate;
determining a comparison result of the judgment value and the preset adjusting threshold according to the area of the position in the coordinate system;
the preset adjusting threshold value comprises preset adjusting threshold value curves corresponding to different compressor current values and exhaust temperatures; the coordinate system is divided into at least two regions by the preset adjustment threshold curve.
7. The apparatus of claim 6,
under the condition that the air conditioner operates in a refrigeration mode, the preset adjusting threshold value curve comprises a first adjusting threshold value curve and a second adjusting threshold value curve; the comparison unit determines a comparison result between the judgment value and the preset adjustment threshold according to the area of the position in the coordinate system, and comprises:
when the position is on a first adjustment threshold curve or outside an area between the first adjustment threshold curve and a coordinate axis, judging that the judgment value is greater than or equal to a first adjustment threshold;
when the position is on the second adjustment threshold curve or in a region between the first adjustment threshold curve and the second adjustment threshold curve, determining that the determination value is smaller than the first adjustment threshold and equal to or larger than the second adjustment threshold;
when the position is in an area formed by a second adjusting threshold curve and a coordinate axis, judging that the judgment value is smaller than a second adjusting threshold;
and/or the presence of a gas in the gas,
under the condition that the air conditioner operates in a heating mode, the preset adjusting threshold curve comprises a third adjusting threshold curve; the comparison unit determines a comparison result between the judgment value and the preset adjustment threshold according to the area of the position in the coordinate system, and comprises:
when the position is on a third adjustment threshold curve or in an area between the third adjustment threshold curve and a coordinate axis, judging that the judgment value is less than or equal to a third adjustment threshold;
when the position is outside the region between the third adjustment threshold value curve and the coordinate axis, it is determined that the determination value is larger than the third adjustment threshold value.
8. The apparatus of any one of claims 5 to 7, wherein the adjusting unit adjusts a motor rotation speed of an indoor unit and/or an on/off state of an outdoor unit motor according to a comparison result between the determination value and the preset adjustment threshold, and comprises:
under the condition that the air conditioner operates in a cooling mode, the preset adjusting threshold value comprises a first adjusting threshold value and a second adjusting threshold value;
if the judgment value is larger than or equal to a first adjusting threshold value, reducing the rotating speed of a motor of the indoor unit; if the judgment value is smaller than a first regulation threshold and larger than or equal to a second regulation threshold, maintaining the current motor rotating speed of the indoor unit; if the judgment value is smaller than a second regulation threshold value, operating according to the current set state;
and/or the presence of a gas in the gas,
under the condition that the air conditioner operates in a heating mode, the preset adjusting threshold comprises a third adjusting threshold;
if the judgment value is larger than a third regulation threshold value, a motor of the outdoor unit is closed; and if the judgment value is less than or equal to a third regulation threshold value, starting a motor of the outdoor unit.
9. A storage medium, having stored thereon a computer program which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 4.
10. A fixed frequency air conditioner comprising a processor, a memory, and a computer program stored in the memory and operable on the processor, wherein the processor executes the program to perform the steps of the method of any one of claims 1 to 4, or comprises the control apparatus of the fixed frequency air conditioner of any one of claims 5 to 8.
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