A fixed-frequency air conditioning system and a control method, device and storage medium thereof

Abstract

The application discloses a control method and device of a fixed-frequency air conditioning system, the fixed-frequency air conditioning system and a storage medium, and relates to the technical field of air conditioning systems. The method comprises the following steps: after the fixed-frequency air conditioning system is started in a refrigeration mode, the initial rotating speed of an indoor fan is determined according to the current outdoor environment temperature, and the indoor fan is controlled to operate at the initial rotating speed; the initial rotating speed of the indoor fan is adjusted according to the current outdoor environment temperature and in combination with the current operating time of the compressor or the current indoor heat exchanger pipe temperature, and the indoor fan is controlled to operate at the current rotating speed obtained through the adjustment; and the current opening degree of a throttling device is corrected according to the current outdoor heat exchanger pipe temperature and the current rotating speed of the indoor fan, and the throttling device is controlled to operate at the new current opening degree obtained through the correction. According to the scheme, the rotating speed of the indoor fan operating after starting is confirmed according to the size of the load of the fixed-frequency air conditioning system, and the refrigerant flow is adjusted according to the outdoor condenser pipe temperature and the indoor fan gear position, so that the stable operation of the high-temperature working condition is ensured, and the comfort of use is improved.

Description

Technical Field

[0001] This invention belongs to the technical field of fixed-frequency air conditioning systems, specifically relating to a control method, device, fixed-frequency air conditioning system, and storage medium for a fixed-frequency air conditioning system, and particularly to a control method, device, fixed-frequency air conditioning system, and storage medium for high-temperature cooling operation of a fixed-frequency air conditioning system. Background Technology

[0002] With increasing global climate anomalies and more frequent extreme heatwaves, living and working conditions are deteriorating. Therefore, household air conditioners, as energy-efficient, high-performance, and convenient air conditioners, are playing an increasingly important role in people's lives and work. In this environment, the harsh working conditions in summer place higher demands on the high-temperature cooling performance of household air conditioners. Generally, fixed-frequency air conditioning systems are prone to high-pressure protection shutdowns when operating at temperatures above 50°C, severely impacting the comfort of using such systems.

[0003] The above content is only used to help understand the technical solution of the present invention and does not represent an admission that the above content is prior art. Summary of the Invention

[0004] The purpose of this invention is to provide a control method, device, system, and storage medium for a fixed-frequency air conditioning system. This addresses the problem that fixed-frequency air conditioning systems are prone to high-pressure protection shutdowns during high-temperature operation, severely impacting user comfort. The invention achieves this by determining the indoor fan speed based on the system load and adjusting the airflow according to the outdoor condenser pipe temperature and indoor fan speed. This reduces high pressure in the fixed-frequency air conditioning system, ensuring stable operation under high-temperature conditions and improving user comfort.

[0005] This invention provides a control method for a fixed-frequency air conditioning system. The fixed-frequency air conditioning system includes: a compressor, an outdoor heat exchanger, an indoor heat exchanger, and a throttling device. An indoor fan is installed at the indoor heat exchanger. The control method includes: after the fixed-frequency air conditioning system is turned on for cooling, acquiring the outdoor ambient temperature of the environment where the air conditioning system is located, and recording it as the current outdoor ambient temperature of the air conditioning system; acquiring the pipe temperature of the indoor heat exchanger of the air conditioning system, and recording it as the current indoor heat exchanger pipe temperature of the air conditioning system; acquiring the pipe temperature of the outdoor heat exchanger of the air conditioning system, and recording it as the current outdoor heat exchanger pipe temperature of the air conditioning system; and acquiring the cumulative running time of the compressor of the air conditioning system, and recording it as the current running time of the compressor; and determining the operating time of the air conditioning system based on the current outdoor ambient temperature of the air conditioning system. The system determines the initial speed of the indoor fan; controls the indoor fan to operate at the determined initial speed; adjusts the initial speed of the indoor fan based on the current outdoor ambient temperature of the air conditioning system, combined with the current running time of the compressor or the current indoor heat exchanger pipe temperature, to obtain the current speed of the indoor fan; controls the indoor fan to operate at the adjusted current speed; after stopping the adjustment of the initial speed of the indoor fan, corrects the current opening degree of the throttling device based on the current outdoor heat exchanger pipe temperature and the current speed of the indoor fan, to obtain a new current opening degree of the throttling device; and controls the throttling device to operate at the new current opening degree.

[0006] In some implementations, determining the initial rotational speed of the indoor fan of the air conditioning system based on the current outdoor ambient temperature includes: determining whether the current outdoor ambient temperature of the air conditioning system is greater than a preset outer ring high temperature threshold; if the current outdoor ambient temperature of the air conditioning system is greater than the preset outer ring high temperature threshold, then determining the interval to which the current outdoor ambient temperature of the air conditioning system belongs within a preset high temperature range; and, based on the correspondence between a set temperature interval and a set initial rotational speed, determining the set initial rotational speed corresponding to the set temperature interval that is the same as the interval to which the current outdoor ambient temperature of the air conditioning system belongs within the preset high temperature range as the initial rotational speed of the indoor fan corresponding to the interval to which the current outdoor ambient temperature of the air conditioning system belongs within the preset high temperature range.

[0007] In some implementations, the preset high temperature range includes: a preset first high temperature range, a preset second high temperature range, a preset third high temperature range, and a preset fourth high temperature range; wherein, the lower limit of the preset first high temperature range is greater than a preset outer ring high temperature threshold, the lower limit of the preset second high temperature range is greater than the upper limit of the preset first high temperature range, the lower limit of the preset third high temperature range is greater than the upper limit of the preset second high temperature range, and the lower limit of the preset fourth high temperature range is greater than the upper limit of the preset third high temperature range; in the correspondence between the set temperature range and the set initial rotation speed, the set initial rotation speed includes: a preset first fan speed, a preset second fan speed, a preset third fan speed, and a preset fourth fan speed; the rotation speed corresponding to the preset first fan speed, the rotation speed corresponding to the preset second fan speed, the rotation speed corresponding to the preset third fan speed, and the rotation speed corresponding to the preset fourth fan speed increase sequentially; according to the correspondence between the set temperature range and the set initial rotation speed, the set initial rotation speed corresponding to the set temperature range that is the same as the current outdoor ambient temperature of the air conditioning system within the preset high temperature range is determined as the rotation speed corresponding to the current outdoor ambient temperature of the air conditioning system within the preset high temperature range. The initial rotational speed of the indoor fan within the temperature range includes: if the current outdoor ambient temperature of the air conditioning system falls within a preset high temperature range and the corresponding interval is a preset first high temperature interval, then the initial rotational speed of the indoor fan is determined to be a preset third fan speed; wherein, if a set fan speed is received from the indoor fan and the set fan speed is lower than the preset third fan speed, then the initial rotational speed of the indoor fan is determined to be the set fan speed; if the current outdoor ambient temperature of the air conditioning system falls within a preset high temperature range and the corresponding interval is a preset second high temperature interval, then the initial rotational speed of the indoor fan is determined to be a preset third fan speed. The initial speed of the indoor fan is the preset second fan speed; wherein, if the set fan speed of the indoor fan is received and the set fan speed of the indoor fan is lower than the preset second fan speed, then the initial speed of the indoor fan is determined to be the set fan speed; if the current outdoor ambient temperature of the air conditioning system is within a preset high temperature range and belongs to a preset third high temperature range, then the initial speed of the indoor fan is determined to be the preset first fan speed; if the current outdoor ambient temperature of the air conditioning system is within a preset high temperature range and belongs to a preset fourth high temperature range, then the initial speed of the indoor fan is determined to be zero.

[0008] In some implementations, the preset high-temperature range includes: a preset first high-temperature range, a preset second high-temperature range, a preset third high-temperature range, and a preset fourth high-temperature range; wherein, the lower limit of the preset first high-temperature range is greater than a preset outer ring high-temperature threshold, the lower limit of the preset second high-temperature range is greater than the upper limit of the preset first high-temperature range, the lower limit of the preset third high-temperature range is greater than the upper limit of the preset second high-temperature range, and the lower limit of the preset fourth high-temperature range is greater than the upper limit of the preset third high-temperature range; based on the current outdoor ambient temperature of the air conditioning system, and in conjunction with the current operating time of the compressor of the air conditioning system or the current indoor heat exchanger pipe temperature of the air conditioning system, the initial speed of the indoor fan is adjusted to obtain the indoor fan speed. The current rotation speed includes: if the current outdoor ambient temperature of the air conditioning system falls within a preset high temperature range, specifically a preset first high temperature range, then, while controlling the indoor fan to operate at a determined initial rotation speed, determining whether the current operating time of the compressor reaches a first set time or the current indoor heat exchanger pipe temperature of the air conditioning system is less than a preset first inner pipe temperature threshold; if satisfied, adjusting the initial rotation speed of the indoor fan to the set fan speed, thereby determining the set fan speed as the current rotation speed of the indoor fan, and controlling the indoor fan to operate at the adjusted set fan speed; and / or, if the current outdoor ambient temperature of the air conditioning system falls within a preset high temperature range... If the range falls within a preset second high-temperature range, then, while controlling the indoor fan to operate at a determined initial speed, it is determined whether the current operating time of the compressor reaches a first set time or the current indoor heat exchanger pipe temperature of the air conditioning system is less than a preset second inner pipe temperature threshold; wherein, the preset second inner pipe temperature threshold is less than the preset first inner pipe temperature threshold; if satisfied, the initial speed of the indoor fan is increased by one level to obtain the first speed of the indoor fan, and the indoor fan is controlled to operate at the adjusted first speed; then, it is determined whether the current operating time of the compressor reaches a second set time or the current indoor heat exchanger pipe temperature of the air conditioning system is less than the preset second inner pipe temperature threshold. An inner pipe temperature threshold; wherein, a preset second set time is greater than a preset first set time; if satisfied, the first speed of the indoor fan is adjusted to the set wind speed of the indoor fan, so as to determine the set wind speed of the indoor fan as the current speed of the indoor fan, and the indoor fan is controlled to run at the adjusted set wind speed of the indoor fan; and / or, if the current outdoor ambient temperature of the air conditioning system is within a preset high temperature range and the interval to which it belongs is a preset third high temperature range, then, while controlling the indoor fan to run at the determined initial speed of the indoor fan, it is determined whether the current running time of the compressor reaches the first set time or the current indoor heat exchanger pipe temperature of the air conditioning system is less than the preset third inner pipe temperature threshold;The preset third inner pipe temperature threshold is less than the preset second inner pipe temperature threshold. If this condition is met, the initial speed of the indoor fan is increased by one level to obtain the second speed of the indoor fan, and the indoor fan is controlled to operate at the adjusted second speed. Then, it is determined whether the current running time of the compressor reaches a third set time or the current indoor heat exchanger pipe temperature of the air conditioning system is less than the preset second inner pipe temperature threshold. The preset third set time is greater than the preset first set time and less than the preset second set time. If this condition is met, the first speed of the indoor fan is increased by one level to obtain the third speed of the indoor fan, and the indoor fan is controlled to operate at the adjusted second speed. The indoor fan operates at its third speed; then, it is determined whether the current operating time of the compressor reaches a fourth preset time or the current indoor heat exchanger pipe temperature of the air conditioning system is less than a preset first inner pipe temperature threshold; wherein, the preset fourth preset time is greater than the preset second preset time; if satisfied, the second speed of the indoor fan is adjusted to the set fan speed of the indoor fan, so that the set fan speed of the indoor fan is determined as the current speed of the indoor fan, and the indoor fan is controlled to operate at the adjusted set fan speed; and / or, if the current outdoor ambient temperature of the air conditioning system falls within a preset high temperature range and belongs to a preset fourth high temperature range, then the control... When the indoor fan is running at its predetermined initial speed, it is determined whether the current running time of the compressor reaches a sixth preset time or the current indoor heat exchanger pipe temperature of the air conditioning system is less than a preset fourth inner pipe temperature threshold. Wherein, the preset sixth preset time is less than a preset first preset time, and the preset fourth inner pipe temperature threshold is less than a preset third inner pipe temperature threshold. If these conditions are met, the initial speed of the indoor fan is increased by one level to obtain the fourth speed of the indoor fan, and the indoor fan is controlled to run at the adjusted fourth speed. Then, it is determined whether the current running time of the compressor reaches a third preset time or the current indoor heat exchanger pipe temperature of the air conditioning system meets the following conditions. If the current indoor heat exchanger tube temperature is less than a preset third inner tube temperature threshold, then the fourth speed of the indoor fan is increased by one level to obtain the fifth speed of the indoor fan, and the indoor fan is controlled to operate at the adjusted fifth speed. Then, it is determined whether the current running time of the compressor reaches the fourth set time or the current indoor heat exchanger tube temperature of the air conditioning system is less than a preset first inner tube temperature threshold. If so, the fifth speed of the indoor fan is adjusted to the set fan speed, so that the set fan speed is determined as the current speed of the indoor fan, and the indoor fan is controlled to operate at the adjusted set fan speed.

[0009] In some implementations, after stopping the initial speed adjustment of the indoor fan, the current opening degree of the throttling device of the air conditioning system is corrected based on the current outdoor heat exchanger pipe temperature and the current speed of the indoor fan to obtain a new current opening degree of the throttling device. This includes: after stopping the initial speed adjustment of the indoor fan, determining whether the current outdoor heat exchanger pipe temperature of the air conditioning system is greater than a preset high temperature threshold for the outdoor pipe; if it is determined that the current outdoor heat exchanger pipe temperature of the air conditioning system is greater than the preset high temperature threshold for the outdoor pipe, then calculating a correction value for the current opening degree of the throttling device based on the current outdoor heat exchanger pipe temperature and the current speed of the indoor fan; and determining the current opening degree of the throttling device and the sum of the correction value of the current opening degree of the throttling device as the new current opening degree of the throttling device, thereby achieving the correction of the current opening degree of the throttling device of the air conditioning system.

[0010] In some embodiments, the current fan speed corresponding to the air setting is any one of a preset first air setting, a preset second air setting, a preset third air setting, and a preset fourth air setting; the fan speed corresponding to the preset first air setting, the preset second air setting, the preset third air setting, and the preset fourth air setting increases sequentially; based on the current outdoor heat exchanger pipe temperature of the air conditioning system and the current fan speed, the correction value of the current opening of the throttling device is calculated, including: determining the current fan speed corresponding to the air setting. The corresponding fan speed is recorded as the current fan speed of the indoor fan. According to the correspondence between the set speed coefficient and the set speed, the set speed coefficient corresponding to the set speed that is the same as the current fan speed of the indoor fan is determined as the current speed coefficient corresponding to the current fan speed of the indoor fan, and recorded as the current speed coefficient of the indoor fan. The difference between the current outdoor heat exchanger pipe temperature of the air conditioning system and the preset temperature threshold is determined, and the product of the difference and the current speed coefficient of the indoor fan is determined as the correction value of the current opening of the throttling device.

[0011] In some implementations, after stopping the initial speed adjustment of the indoor fan, the current opening degree of the throttling device of the air conditioning system is corrected based on the current outdoor heat exchanger pipe temperature and the current speed of the indoor fan to obtain a new current opening degree of the throttling device. This further includes: calculating a correction value for the new current opening degree of the throttling device based on the current outdoor heat exchanger pipe temperature and the current speed of the indoor fan; controlling the throttling device to operate at the new current opening degree for a seventh set time; then returning to the previous state to: recalculate the correction value for the new current opening degree of the throttling device based on the current outdoor heat exchanger pipe temperature and the current speed of the indoor fan; this cycle continues until the latest obtained current opening degree of the throttling device reaches the set maximum opening degree, at which point further correction of the latest obtained current opening degree of the throttling device is stopped, and the throttling device is kept operating at the latest obtained current opening degree.

[0012] In conjunction with the above method, another aspect of the present invention provides a control device for a fixed-frequency air conditioning system, wherein the fixed-frequency air conditioning system includes: a compressor, an outdoor heat exchanger, an indoor heat exchanger, and a throttling device, and an indoor fan is provided at the indoor heat exchanger; the control device for the fixed-frequency air conditioning system includes: an acquisition unit configured to acquire, after the fixed-frequency air conditioning system is turned on for cooling, acquire the outdoor ambient temperature of the environment where the air conditioning system is located, and record it as the current outdoor ambient temperature of the air conditioning system; acquire the pipe temperature of the indoor heat exchanger of the air conditioning system, and record it as the current indoor heat exchanger pipe temperature of the air conditioning system; acquire the pipe temperature of the outdoor heat exchanger of the air conditioning system, and record it as the current outdoor heat exchanger pipe temperature of the air conditioning system; and acquire the cumulative running time of the compressor of the air conditioning system, and record it as the current running time of the compressor; and a control unit configured to determine, based on the current outdoor ambient temperature of the air conditioning system, […]. The control unit is configured to: determine the initial speed of the indoor fan of the air conditioning system; and control the indoor fan to operate at the determined initial speed; the control unit is further configured to: adjust the initial speed of the indoor fan based on the current outdoor ambient temperature of the air conditioning system, combined with the current running time of the compressor of the air conditioning system or the current indoor heat exchanger pipe temperature of the air conditioning system, to obtain the current speed of the indoor fan; and control the indoor fan to operate at the adjusted current speed; the control unit is further configured to: after stopping the adjustment of the initial speed of the indoor fan, correct the current opening degree of the throttling device of the air conditioning system based on the current outdoor heat exchanger pipe temperature of the air conditioning system and the current speed of the indoor fan, to obtain a new current opening degree of the throttling device; and control the throttling device to operate at the new current opening degree.

[0013] In some embodiments, the control unit determines the initial rotational speed of the indoor fan of the air conditioning system based on the current outdoor ambient temperature of the air conditioning system, including: determining whether the current outdoor ambient temperature of the air conditioning system is greater than a preset outer ring high temperature threshold; if the current outdoor ambient temperature of the air conditioning system is determined to be greater than the preset outer ring high temperature threshold, then determining the interval to which the current outdoor ambient temperature of the air conditioning system belongs within a preset high temperature range; and, based on the correspondence between a set temperature interval and a set initial rotational speed, determining the set initial rotational speed corresponding to the set temperature interval that is the same as the interval to which the current outdoor ambient temperature of the air conditioning system belongs within the preset high temperature range as the initial rotational speed of the indoor fan corresponding to the interval to which the current outdoor ambient temperature of the air conditioning system belongs within the preset high temperature range.

[0014] In some implementations, the preset high temperature range includes: a preset first high temperature range, a preset second high temperature range, a preset third high temperature range, and a preset fourth high temperature range; wherein, the lower limit of the preset first high temperature range is greater than a preset outer ring high temperature threshold, the lower limit of the preset second high temperature range is greater than the upper limit of the preset first high temperature range, the lower limit of the preset third high temperature range is greater than the upper limit of the preset second high temperature range, and the lower limit of the preset fourth high temperature range is greater than the upper limit of the preset third high temperature range; in the correspondence between the set temperature range and the set initial speed, the set initial speed includes: a preset first fan speed, a preset second fan speed, a preset third fan speed, and a preset fourth fan speed; the speed corresponding to the preset first fan speed, the speed corresponding to the preset second fan speed, the speed corresponding to the preset third fan speed, and the speed corresponding to the preset fourth fan speed increase sequentially; the control unit, according to the correspondence between the set temperature range and the set initial speed, determines the set initial speed corresponding to the set temperature range that is the same as the range to which the current outdoor ambient temperature of the air conditioning system belongs within the preset high temperature range, as the speed corresponding to the current outdoor ambient temperature of the air conditioning system belongs within the preset high temperature range. The initial speed of the indoor fan corresponding to the preset high temperature range includes: if the current outdoor ambient temperature of the air conditioning system falls within a preset first high temperature range, then the initial speed of the indoor fan is determined to be a preset third fan speed; wherein, if a set fan speed is received from the indoor fan and the set fan speed is lower than the preset third fan speed, then the initial speed of the indoor fan is determined to be the set fan speed; if the current outdoor ambient temperature of the air conditioning system falls within a preset second high temperature range, then the initial speed of the indoor fan is determined to be... The initial speed of the indoor fan is a preset second fan speed; wherein, if a set fan speed is received from the indoor fan and the set fan speed is lower than the preset second fan speed, the initial speed of the indoor fan is determined to be the set fan speed; if the current outdoor ambient temperature of the air conditioning system falls within a preset high temperature range and is located in a preset third high temperature range, the initial speed of the indoor fan is determined to be a preset first fan speed; if the current outdoor ambient temperature of the air conditioning system falls within a preset high temperature range and is located in a preset fourth high temperature range, the initial speed of the indoor fan is determined to be zero.

[0015] In some implementations, the preset high-temperature range includes: a preset first high-temperature range, a preset second high-temperature range, a preset third high-temperature range, and a preset fourth high-temperature range; wherein, the lower limit of the preset first high-temperature range is greater than a preset outer ring high-temperature threshold, the lower limit of the preset second high-temperature range is greater than the upper limit of the preset first high-temperature range, the lower limit of the preset third high-temperature range is greater than the upper limit of the preset second high-temperature range, and the lower limit of the preset fourth high-temperature range is greater than the upper limit of the preset third high-temperature range; the control unit, based on the current outdoor ambient temperature of the air conditioning system and in conjunction with the current operating time of the compressor of the air conditioning system or the air conditioning system... The system adjusts the initial speed of the indoor fan based on the current indoor heat exchanger pipe temperature to obtain the current speed of the indoor fan. This includes: if the current outdoor ambient temperature of the air conditioning system falls within a preset first high temperature range, then, while controlling the indoor fan to operate at the determined initial speed, determining whether the current operating time of the compressor reaches a first set time or the current indoor heat exchanger pipe temperature of the air conditioning system is less than a preset first indoor pipe temperature threshold; if so, adjusting the initial speed of the indoor fan to the set fan speed to ensure the set fan speed is within the set range. The current speed of the indoor fan is set, and the indoor fan is controlled to operate at the adjusted set fan speed; and / or, if the current outdoor ambient temperature of the air conditioning system falls within a preset high temperature range, specifically within a preset second high temperature range, then, while controlling the indoor fan to operate at the determined initial speed, it is determined whether the current operating time of the compressor reaches a first set time or the current indoor heat exchanger pipe temperature of the air conditioning system is less than a preset second inner pipe temperature threshold; wherein, the preset second inner pipe temperature threshold is less than a preset first inner pipe temperature threshold; if satisfied, the initial speed of the indoor fan is adjusted. The speed is increased by one level to obtain the first speed of the indoor fan, and the indoor fan is controlled to run at the adjusted first speed. Then, it is determined whether the current running time of the compressor reaches the second set time or the current indoor heat exchanger pipe temperature of the air conditioning system is less than the preset first inner pipe temperature threshold. The preset second set time is greater than the preset first set time. If the conditions are met, the first speed of the indoor fan is adjusted to the set fan speed, so that the set fan speed is determined as the current speed of the indoor fan, and the indoor fan is controlled to run at the adjusted set fan speed.And / or, if the current outdoor ambient temperature of the air conditioning system falls within a preset high temperature range, specifically within a preset third high temperature range, then, while controlling the indoor fan to operate at a predetermined initial speed, it is determined whether the current operating time of the compressor has reached a first set time or the current indoor heat exchanger pipe temperature of the air conditioning system is less than a preset third inner pipe temperature threshold; wherein the preset third inner pipe temperature threshold is less than a preset second inner pipe temperature threshold; if satisfied, the initial speed of the indoor fan is increased by one level to obtain a second speed of the indoor fan, and the indoor fan is controlled to operate at the adjusted second speed; subsequently, it is determined whether the current operating time of the compressor has reached a first set time. The third set time or the current indoor heat exchanger pipe temperature of the air conditioning system is less than the preset second inner pipe temperature threshold; wherein, the preset third set time is greater than the preset first set time and less than the preset second set time; if satisfied, the first speed of the indoor fan is increased by one level to obtain the third speed of the indoor fan, and the indoor fan is controlled to run at the adjusted third speed; then, it is determined whether the current running time of the compressor reaches the fourth set time or the current indoor heat exchanger pipe temperature of the air conditioning system is less than the preset first inner pipe temperature threshold; wherein, the preset fourth set time is greater than the preset second set time; if satisfied, the second speed of the indoor fan is adjusted to the preset second set time. The system sets a fixed fan speed to determine the current rotation speed of the indoor fan and controls the indoor fan to operate at the adjusted set fan speed. Alternatively, if the current outdoor ambient temperature of the air conditioning system falls within a preset high-temperature range, specifically a preset fourth high-temperature range, then while controlling the indoor fan to operate at the determined initial rotation speed, it determines whether the current operating time of the compressor reaches a sixth preset time or the current indoor heat exchanger pipe temperature of the air conditioning system is less than a preset fourth inner pipe temperature threshold. Wherein, the preset sixth preset time is less than a preset first preset time, and the preset fourth inner pipe temperature threshold is less than a preset third inner pipe temperature threshold. If satisfied, then... If the initial speed of the indoor fan is sufficient, the initial speed of the indoor fan is increased by one level to obtain the fourth speed of the indoor fan, and the indoor fan is controlled to operate at the adjusted fourth speed. Then, it is determined whether the current running time of the compressor reaches the third set time or the current indoor heat exchanger pipe temperature of the air conditioning system is less than the preset third inner pipe temperature threshold. If satisfied, the fourth speed of the indoor fan is increased by one level to obtain the fifth speed of the indoor fan, and the indoor fan is controlled to operate at the adjusted fifth speed. Then, it is determined whether the current running time of the compressor reaches the fourth set time or the current indoor heat exchanger pipe temperature of the air conditioning system is less than the preset first inner pipe temperature threshold.If the conditions are met, the fifth speed of the indoor fan is adjusted to the set fan speed, thus determining the set fan speed as the current speed of the indoor fan, and the indoor fan is controlled to operate at the adjusted set fan speed.

[0016] In some embodiments, after the control unit stops adjusting the initial speed of the indoor fan, it corrects the current opening degree of the throttling device of the air conditioning system based on the current outdoor heat exchanger pipe temperature and the current speed of the indoor fan to obtain a new current opening degree of the throttling device. This includes: after stopping the adjustment of the initial speed of the indoor fan, determining whether the current outdoor heat exchanger pipe temperature of the air conditioning system is greater than a preset high temperature threshold for the outdoor pipe; if it is determined that the current outdoor heat exchanger pipe temperature of the air conditioning system is greater than the preset high temperature threshold for the outdoor pipe, calculating a correction value for the current opening degree of the throttling device based on the current outdoor heat exchanger pipe temperature and the current speed of the indoor fan; and determining the current opening degree of the throttling device and the sum of the correction value for the current opening degree of the throttling device as the new current opening degree of the throttling device, thereby achieving the correction of the current opening degree of the throttling device of the air conditioning system.

[0017] In some embodiments, the current fan speed corresponding to the air setting is any one of a preset first air setting, a preset second air setting, a preset third air setting, and a preset fourth air setting; the fan speed corresponding to the preset first air setting, the preset second air setting, the preset third air setting, and the preset fourth air setting increases sequentially; the control unit calculates the correction value of the current opening degree of the throttling device based on the current outdoor heat exchanger pipe temperature of the air conditioning system and the current fan speed of the indoor fan, including: determining the current fan speed of the indoor fan. The fan speed corresponding to the current speed is recorded as the current fan speed of the indoor fan. According to the correspondence between the set speed coefficient and the set speed, the set speed coefficient corresponding to the set speed that is the same as the current fan speed of the indoor fan is determined as the current speed coefficient corresponding to the current fan speed of the indoor fan, and recorded as the current speed coefficient of the indoor fan. The difference between the current outdoor heat exchanger pipe temperature of the air conditioning system and the preset temperature threshold is determined, and the product of the difference and the current speed coefficient of the indoor fan is determined as the correction value of the current opening of the throttling device.

[0018] In some embodiments, after the control unit stops adjusting the initial speed of the indoor fan, it corrects the current opening of the throttling device of the air conditioning system based on the current outdoor heat exchanger pipe temperature and the current speed of the indoor fan to obtain a new current opening of the throttling device. This further includes: calculating a correction value for the new current opening of the throttling device based on the current outdoor heat exchanger pipe temperature and the current speed of the indoor fan; controlling the throttling device to operate at the new current opening for a seventh set time; and then returning to the previous state to: recalculate the correction value for the new current opening of the throttling device based on the current outdoor heat exchanger pipe temperature and the current speed of the indoor fan; repeating this process until the latest obtained current opening of the throttling device reaches the set maximum opening, at which point further correction of the latest obtained current opening of the throttling device is stopped, and the throttling device is kept operating at the latest obtained current opening.

[0019] In conjunction with the above-mentioned device, the present invention further provides a fixed-frequency air conditioning system, including: the control device for the fixed-frequency air conditioning system described above.

[0020] In conjunction with the above method, the present invention further provides a storage medium comprising a stored program, wherein, when the program is executed, the device on which the storage medium is located executes the control method of the fixed-frequency air conditioning system described above.

[0021] Therefore, the solution of the present invention, after the fixed-frequency air conditioning system is turned on for cooling, when the outdoor ambient temperature is higher than the high temperature threshold of the outer ring, determines the initial speed of the indoor fan according to the high temperature zone where the outdoor ambient temperature is located, and adjusts the initial speed of the indoor fan according to the compressor running time or the indoor heat exchanger pipe temperature; and after the adjustment of the initial speed of the indoor fan is stopped, when the outdoor heat exchanger pipe temperature is higher than the high temperature threshold of the outer pipe, the opening of the electronic expansion valve is corrected according to the outdoor heat exchanger pipe temperature and the indoor fan speed. Thus, by determining the indoor fan speed at startup according to the load of the fixed-frequency air conditioning system, and adjusting the flow rate of the fixed-frequency air conditioning system according to the outdoor condenser pipe temperature and the indoor fan speed, the high pressure of the fixed-frequency air conditioning system is reduced, ensuring the stable operation of the fixed-frequency air conditioning system under high temperature conditions, which is beneficial to improving the comfort of using the fixed-frequency air conditioning system.

[0022] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention.

[0023] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0024] Figure 1 This is a flowchart illustrating an embodiment of the control method for a fixed-frequency air conditioning system according to the present invention;

[0025] Figure 2 This is a schematic flowchart of an embodiment of the method of the present invention for determining the initial speed of the indoor fan based on the current outdoor ambient temperature;

[0026] Figure 3 This is a schematic flowchart of an embodiment of the first adjustment process in the method of the present invention, which adjusts the initial speed of the indoor fan according to the current outdoor ambient temperature and in combination with the current running time of the compressor or the current indoor heat exchanger tube temperature.

[0027] Figure 4 This is a schematic flowchart of an embodiment of the second adjustment process in the method of the present invention, which adjusts the initial speed of the indoor fan according to the current outdoor ambient temperature and in combination with the current running time of the compressor or the current indoor heat exchanger tube temperature.

[0028] Figure 5 This is a schematic flowchart of an embodiment of the third adjustment process in the method of the present invention, which adjusts the initial speed of the indoor fan according to the current outdoor ambient temperature and in combination with the current running time of the compressor or the current indoor heat exchanger tube temperature.

[0029] Figure 6 This is a schematic flowchart of an embodiment of the fourth adjustment process in the method of the present invention, which adjusts the initial speed of the indoor fan according to the current outdoor ambient temperature and in combination with the current running time of the compressor or the current indoor heat exchanger tube temperature.

[0030] Figure 7 This is a schematic flowchart of an embodiment of the method of the present invention, which corrects the current opening degree of the throttling device based on the current outdoor heat exchanger tube temperature and the current speed of the indoor fan.

[0031] Figure 8 This is a schematic flowchart of an embodiment of the method of the present invention, which calculates the correction value of the current opening degree of the throttling device based on the current outdoor heat exchanger tube temperature and the current speed of the indoor fan.

[0032] Figure 9 This is a flowchart illustrating an embodiment of the method of the present invention that cyclically corrects the current opening of the throttling device at regular intervals.

[0033] Figure 10 This is a schematic diagram of the structure of a control device for a fixed-frequency air conditioning system according to an embodiment of the present invention;

[0034] Figure 11 This is a schematic diagram of a structure of an embodiment of a fixed-frequency air conditioning system;

[0035] Figure 12 This is a flowchart illustrating an embodiment of a control method for high-temperature cooling operation of a fixed-frequency air conditioning system.

[0036] Referring to the accompanying drawings, the reference numerals in the embodiments of the present invention are as follows:

[0037] 102 - Acquisition unit; 104 - Control unit. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0039] Considering that fixed-frequency air conditioning systems are prone to high-pressure protection shutdowns under high-temperature conditions, severely impacting user comfort, solutions typically involve adding a pressure relief valve or increasing the heat exchange area of ​​the outdoor unit's condenser. However, adding a pressure relief valve reduces the cooling capacity of the fixed-frequency air conditioning system, while increasing the heat exchange area of ​​the outdoor unit's condenser increases manufacturing costs.

[0040] Under high-temperature conditions, given a fixed outdoor unit condenser size and heat exchange area in a fixed-frequency air conditioning system, the heat exchange capacity of the outdoor condenser deteriorates when the load is high. This is especially true when the system is first turned on, as the pressure balance of the fixed-frequency air conditioning system rises rapidly, resulting in overshoot. Furthermore, prolonged operation under high load conditions keeps the high pressure of the fixed-frequency air conditioning system within a relatively high range, leading to increased power consumption.

[0041] Therefore, the present invention provides a control method for a fixed-frequency air conditioning system, specifically a control method for high-temperature cooling operation of a fixed-frequency air conditioning system. This method determines the indoor fan speed at startup based on the load of the fixed-frequency air conditioning system, and adjusts the flow rate of the fixed-frequency air conditioning system according to the outdoor condenser pipe temperature and the indoor fan speed. This reduces the high pressure of the fixed-frequency air conditioning system, preventing high-pressure protection shutdowns during high-temperature cooling operation, ensuring stable operation of the fixed-frequency air conditioning system under high-temperature conditions, and improving the comfort of using the fixed-frequency air conditioning system.

[0042] According to embodiments of the present invention, a control method for a fixed-frequency air conditioning system is provided, such as... Figure 1The diagram shows a flow chart of an embodiment of the method of the present invention. The fixed-frequency air conditioning system includes: a compressor, an outdoor heat exchanger, an indoor heat exchanger, and a throttling device. An indoor fan is installed at the indoor heat exchanger. The fixed-frequency air conditioning system also includes a four-way valve, and an outdoor fan is installed at the outdoor heat exchanger. The exhaust port of the compressor, after passing through the second port of the four-way valve, the outdoor heat exchanger, the throttling device, and the indoor heat exchanger, is connected to the fourth port of the four-way valve; the third port of the four-way valve is connected to the intake port of the compressor. Specifically, Figure 11 This is a schematic diagram of a fixed-frequency air conditioning system according to one embodiment. Figure 11 The fixed-frequency air conditioning system shown includes an outdoor side and an indoor side. The indoor side of the fixed-frequency air conditioning system is equipped with an indoor heat exchanger (such as an evaporator in cooling mode) and an indoor fan; a temperature sensor is installed inside the evaporator to detect the evaporator pipe temperature T. 蒸发器 The indoor fan system uses two axial flow fans, each with four fan speed settings: high, medium, and low. On the outdoor side of the fixed-frequency air conditioning system, there is a compressor, a four-way valve, an outdoor heat exchanger (i.e., the condenser in cooling mode), a throttling device 1 (such as an electronic expansion valve), and the outdoor fan. A temperature sensor is installed inside the condenser to detect the condenser pipe temperature, i.e., the outdoor condenser pipe temperature T. 外管 .like Figure 11 As shown, the compressor's exhaust port is connected to the first port of the four-way valve; the second port of the four-way valve, after passing through the outdoor heat exchanger, the electronic expansion valve, and the indoor heat exchanger, is connected to the third port of the four-way valve; and the fourth port of the four-way valve is connected to the compressor's intake port.

[0043] In the solution of the present invention, such as Figure 1 As shown, the control method of the fixed-frequency air conditioning system includes steps S110 to S140.

[0044] In step S110, after the fixed-frequency air conditioning system is turned on for cooling, the outdoor ambient temperature of the environment where the air conditioning system is located is obtained and recorded as the current outdoor ambient temperature of the air conditioning system (e.g., outdoor ambient temperature T). 外环 ); Obtain the pipe temperature of the indoor heat exchanger of the air conditioning system, and record it as the current indoor heat exchanger pipe temperature of the air conditioning system (e.g., indoor evaporator pipe temperature T). 蒸发器 ); Obtain the pipe temperature of the outdoor heat exchanger of the air conditioning system, and record it as the current outdoor heat exchanger pipe temperature of the air conditioning system (e.g., outdoor condenser pipe temperature T). 外管 The cumulative running time of the compressor in the air conditioning system is obtained and recorded as the current running time of the compressor.

[0045] In step S120, the initial speed of the indoor fan of the air conditioning system is determined based on the current outdoor ambient temperature of the air conditioning system; and the indoor fan is controlled to run at the determined initial speed.

[0046] In some embodiments, the specific process of determining the initial speed of the indoor fan of the air conditioning system based on the current outdoor ambient temperature of the air conditioning system in step S120 is described in the following exemplary description.

[0047] The following is combined Figure 2 The flowchart shown is a schematic diagram of an embodiment of the method of the present invention for determining the initial speed of the indoor fan based on the current outdoor ambient temperature. It further illustrates the specific process of determining the initial speed of the indoor fan based on the current outdoor ambient temperature in step S120, including steps S210 to S230.

[0048] Step S210: Determine whether the current outdoor ambient temperature of the air conditioning system is greater than the preset outer ring high temperature threshold; wherein, the preset outer ring high temperature threshold is, for example, 40°C.

[0049] Step S220: If it is determined that the current outdoor ambient temperature of the air conditioning system is greater than the preset outer ring high temperature threshold, then the current outdoor ambient temperature of the air conditioning system is determined to be within the preset high temperature range; of course, if it is determined that the current outdoor ambient temperature of the air conditioning system is not greater than the preset outer ring high temperature threshold, then return to continue to obtain the current outdoor ambient temperature of the air conditioning system.

[0050] Step S230: Based on the correspondence between the set temperature range and the set initial speed, determine the set initial speed corresponding to the set temperature range that is the same as the range to which the current outdoor ambient temperature of the air conditioning system belongs within the preset high temperature range, as the initial speed of the indoor fan corresponding to the range to which the current outdoor ambient temperature of the air conditioning system belongs within the preset high temperature range.

[0051] Specifically, Figure 12 This is a flowchart illustrating an embodiment of a control method for high-temperature cooling operation of a fixed-frequency air conditioning system. Figure 12 As shown, the control method for high-temperature cooling operation of a fixed-frequency air conditioning system includes:

[0052] Step 1: Start the fixed-frequency air conditioning system in cooling mode, then proceed to Step 2.

[0053] Step 2: Begin detecting the outdoor ambient temperature T of the fixed-frequency air conditioning system. 外环 Then proceed to step 3.

[0054] Step 3: Determine if the outdoor ambient temperature T is met. 外环>40℃: If so, proceed to step 4; otherwise, return to step 2.

[0055] Step 4, when the outdoor ambient temperature T is met 外环 If the temperature is >40℃, the fixed-frequency air conditioning system is considered to be operating under high-temperature cooling conditions. Then proceed to step 5.

[0056] Step 5: Further adjust according to different outdoor ambient temperatures T 外环 Differentiate between high-temperature zones 1 to 4. Specifically, based on the differentiation results, selectively execute steps 51, 52, 53, and 54, and then execute step 6.

[0057] In some embodiments, the preset high temperature range includes: a preset first high temperature range, a preset second high temperature range, a preset third high temperature range, and a preset fourth high temperature range, where the first high temperature range is such as high temperature zone 1, the second high temperature range is such as high temperature zone 2, the third high temperature range is such as high temperature zone 3, and the fourth high temperature range is such as high temperature zone 4; wherein, the lower limit of the preset first high temperature range is greater than a preset outer ring high temperature threshold, the lower limit of the preset second high temperature range is greater than the upper limit of the preset first high temperature range, the lower limit of the preset third high temperature range is greater than the upper limit of the preset second high temperature range, and the lower limit of the preset fourth high temperature range is greater than the upper limit of the preset third high temperature range.

[0058] Specifically, such as Figure 12 As shown, the control method for high-temperature cooling operation of a fixed-frequency air conditioning system further includes: in step 5, according to different outdoor ambient temperatures T 外环 For a detailed explanation of how to distinguish between high-temperature zones 1 to 4, please refer to the example shown in Table 1.

[0059] Table 1: Temperatures under different outdoor ambient temperatures (T) 外环 Correspondence table with different high temperature zones

[0060] interval Temperature range High temperature zone 1 <![CDATA[40℃<T 外环 ≤45℃]]> High temperature zone 2 <![CDATA[45℃<T 外环 ≤50℃]]> High temperature zone 3 <![CDATA[50℃<T 外环 ≤55℃]]> High temperature zone 4 <![CDATA[55℃<T 外环 ]]>

[0061] In step S230, in the correspondence between the set temperature range and the set initial speed, the set initial speed includes: a preset first wind speed, a preset second wind speed, a preset third wind speed, and a preset fourth wind speed. The first wind speed is such as a low wind speed, the second wind speed is such as a medium wind speed, the third wind speed is such as a high wind speed, and the fourth wind speed is such as a super strong wind speed. The speed corresponding to the preset first wind speed, the speed corresponding to the preset second wind speed, the speed corresponding to the preset third wind speed, and the speed corresponding to the preset fourth wind speed increase sequentially.

[0062] In step S230, based on the correspondence between the set temperature range and the set initial speed, the set initial speed corresponding to the set temperature range that is the same as the range to which the current outdoor ambient temperature of the air conditioning system belongs within the preset high temperature range is determined as the initial speed of the indoor fan corresponding to the range to which the current outdoor ambient temperature of the air conditioning system belongs within the preset high temperature range. This includes any of the following determination scenarios for the initial speed of the indoor fan: the first determination scenario for the initial speed of the indoor fan, the second determination scenario for the initial speed of the indoor fan, the third determination scenario for the initial speed of the indoor fan, and the fourth determination scenario for the initial speed of the indoor fan.

[0063] The first scenario for determining the initial speed of the indoor fan is as follows: If the current outdoor ambient temperature of the air conditioning system falls within a preset high-temperature range, specifically the first high-temperature range, then the initial speed of the indoor fan is determined to be the preset third fan speed. If a set fan speed is received from the indoor fan, and that set fan speed is lower than the preset third fan speed, then the initial speed of the indoor fan is determined to be the set fan speed. Conversely, if no set fan speed is received from the indoor fan, or if the received set fan speed is not lower than the preset third fan speed, then the initial speed of the indoor fan is determined to be the preset third fan speed. Specifically, as follows... Figure 12 As shown, the control method for high-temperature cooling operation of a fixed-frequency air conditioning system further includes: Step 51, when the outdoor ambient temperature T... 外环 When in high temperature zone 1, the initial speed of the indoor fan of the fixed frequency air conditioning system is controlled by default to high fan speed (if the set fan speed of the indoor fan is lower than the high fan speed, it will run at the set fan speed).

[0064] The second scenario for determining the initial speed of the indoor fan: If the current outdoor ambient temperature of the air conditioning system falls within a preset high-temperature range, specifically the second preset high-temperature range, then the initial speed of the indoor fan is determined to be the second preset fan speed. Specifically, if a set fan speed is received from the indoor fan and that set fan speed is lower than the second preset fan speed, then the initial speed of the indoor fan is determined to be the set fan speed. Conversely, if no set fan speed is received from the indoor fan, or if the received set fan speed is not lower than the second preset fan speed, then the initial speed of the indoor fan is determined to be the second preset fan speed. Specifically, as follows... Figure 12 As shown, the control method for high-temperature cooling operation of a fixed-frequency air conditioning system further includes: Step 52, when the outdoor ambient temperature T... 外环 When in high temperature zone 2, the initial speed of the indoor fan of the fixed frequency air conditioning system is set to medium speed by default (if the set speed of the indoor fan is lower than the medium speed, it will run at the set speed).

[0065] The third scenario for determining the initial speed of the indoor fan: If the current outdoor ambient temperature of the air conditioning system falls within a preset high-temperature range, specifically the third preset high-temperature range, then the initial speed of the indoor fan is determined to be the preset first fan speed; specifically, as shown... Figure 12 As shown, the control method for high-temperature cooling operation of a fixed-frequency air conditioning system further includes: Step 53, when the outdoor ambient temperature T... 外环 When in high temperature zone 3, the initial speed of the indoor fan of the fixed frequency air conditioning system is set to low fan speed by default.

[0066] The fourth scenario for determining the initial speed of the indoor fan: If the current outdoor ambient temperature of the air conditioning system falls within a preset high-temperature range, specifically the fourth preset high-temperature range, then the initial speed of the indoor fan is determined to be zero, meaning the indoor fan is not turned on. Specifically, as follows... Figure 12 As shown, the control method for high-temperature cooling operation of a fixed-frequency air conditioning system further includes: Step 54, when the outdoor ambient temperature T... 外环 When in high temperature zone 4, the indoor fan of the fixed frequency air conditioning system should not be turned on.

[0067] In step S130, while controlling the indoor fan to operate at the determined initial speed, the initial speed of the indoor fan is adjusted according to the current outdoor ambient temperature of the air conditioning system, and in combination with the current running time of the compressor of the air conditioning system or the current indoor heat exchanger pipe temperature of the air conditioning system, to obtain the current speed of the indoor fan; and the indoor fan is controlled to operate at the adjusted current speed.

[0068] In some embodiments, the preset high temperature range includes: a preset first high temperature range, a preset second high temperature range, a preset third high temperature range, and a preset fourth high temperature range, where the first high temperature range is such as high temperature zone 1, the second high temperature range is such as high temperature zone 2, the third high temperature range is such as high temperature zone 3, and the fourth high temperature range is such as high temperature zone 4; wherein, the lower limit of the preset first high temperature range is greater than a preset outer ring high temperature threshold, the lower limit of the preset second high temperature range is greater than the upper limit of the preset first high temperature range, the lower limit of the preset third high temperature range is greater than the upper limit of the preset second high temperature range, and the lower limit of the preset fourth high temperature range is greater than the upper limit of the preset third high temperature range.

[0069] In step S130, while controlling the indoor fan to operate at the determined initial speed, the initial speed of the indoor fan is adjusted according to the current outdoor ambient temperature of the air conditioning system, combined with the current running time of the compressor of the air conditioning system or the current indoor heat exchanger pipe temperature of the air conditioning system, to obtain the current speed of the indoor fan. This includes any of the following processes for adjusting the initial speed of the indoor fan: the first process, the second process, the third process, and the fourth process.

[0070] The first process of adjusting the initial speed of the indoor fan is a first adjustment process that adjusts the initial speed of the indoor fan according to the current outdoor ambient temperature and in combination with the current running time of the compressor or the current indoor heat exchanger pipe temperature.

[0071] The following is combined Figure 3 The flowchart shown is a schematic diagram of an embodiment of the first adjustment process of adjusting the initial speed of the indoor fan according to the current outdoor ambient temperature and in combination with the current running time of the compressor or the current indoor heat exchanger pipe temperature in the method of the present invention. It further illustrates the specific process of the first adjustment process of adjusting the initial speed of the indoor fan according to the current outdoor ambient temperature and in combination with the current running time of the compressor or the current indoor heat exchanger pipe temperature in step S130, including: steps S310 to S320.

[0072] Step S310: If the current outdoor ambient temperature of the air conditioning system falls within a preset high-temperature range, specifically within a preset first high-temperature range, then after determining that the indoor fan is operating at a predetermined initial speed, and while controlling the indoor fan to operate at the predetermined initial speed, it is determined whether the current operating time of the compressor reaches a first set time or the current indoor heat exchanger pipe temperature of the air conditioning system is less than a preset first inner pipe temperature threshold. The first set time is, for example, 2 minutes, and the first inner pipe temperature threshold is, for example, 10°C.

[0073] Step S320: If satisfied, adjust the initial speed of the indoor fan to the set speed of the indoor fan, so as to determine the set speed of the indoor fan as the current speed of the indoor fan, and control the indoor fan to run according to the adjusted set speed of the indoor fan; of course, if not satisfied, continue to maintain the current control mode.

[0074] Specifically, such as Figure 12As shown, the control method for high-temperature cooling operation of a fixed-frequency air conditioning system further includes: in step 51, when the outdoor ambient temperature T... 外环 When in high-temperature zone 1, the initial speed of the indoor fan of the fixed-frequency air conditioning system is set to high fan speed by default (if the set fan speed of the indoor fan is lower than high fan speed, it will operate at the set fan speed). After that, when the compressor runs for 2 minutes or the evaporator pipe temperature T... 蒸发器 If the temperature is below 10℃, the initial speed control of the indoor fan of the fixed-frequency air conditioning system will be discontinued, and the indoor fan will be controlled to operate according to the fan speed set by the user.

[0075] The second method of adjusting the initial speed of the indoor fan is a second adjustment process that adjusts the initial speed of the indoor fan based on the current outdoor ambient temperature and in combination with the current running time of the compressor or the current indoor heat exchanger pipe temperature.

[0076] The following is combined Figure 4 The flowchart shown is a schematic diagram of an embodiment of the second adjustment process of adjusting the initial speed of the indoor fan according to the current outdoor ambient temperature and in combination with the current running time of the compressor or the current indoor heat exchanger tube temperature in the method of the present invention. It further illustrates the specific process of the second adjustment process of adjusting the initial speed of the indoor fan according to the current outdoor ambient temperature and in combination with the current running time of the compressor or the current indoor heat exchanger tube temperature in step S130, including steps S410 to S440.

[0077] Step S410: If the current outdoor ambient temperature of the air conditioning system falls within a preset second high-temperature range, after determining that the indoor fan is running at a predetermined initial speed, and while the indoor fan is running at the predetermined initial speed, it is determined whether the current operating time of the compressor reaches a first set time or the current indoor heat exchanger pipe temperature of the air conditioning system is less than a preset second inner pipe temperature threshold; wherein the preset second inner pipe temperature threshold is less than a preset first inner pipe temperature threshold. The first set time is, for example, 2 minutes; the first inner pipe temperature threshold is, for example, 10°C; and the second inner pipe temperature threshold is, for example, 8°C.

[0078] Step S420: If the conditions are met, the initial speed of the indoor fan is increased by one level to obtain the first speed of the indoor fan, and the indoor fan is controlled to operate at the adjusted first speed. If the conditions are not met, the current control mode is maintained. The first speed of the indoor fan is, for example, the high fan speed setting.

[0079] Step S430: Then, determine whether the current operating time of the compressor reaches a second set time or the current indoor heat exchanger pipe temperature of the air conditioning system is less than a preset first inner pipe temperature threshold; wherein the preset second set time is greater than the preset first set time. For example, the first set time is 2 minutes, the second set time is 4 minutes, and the second inner pipe temperature threshold is 8°C.

[0080] Step S440: If satisfied, adjust the first speed of the indoor fan to the set speed of the indoor fan, so as to determine the set speed of the indoor fan as the current speed of the indoor fan, and control the indoor fan to run according to the adjusted set speed of the indoor fan; of course, if not satisfied, continue to maintain the current control mode.

[0081] Specifically, such as Figure 12 As shown, the control method for high-temperature cooling operation of a fixed-frequency air conditioning system further includes: in step 52, when the outdoor ambient temperature T... 外环 When in high-temperature zone 2, the initial speed of the indoor fan of the fixed-frequency air conditioning system is set to medium fan speed by default (if the set fan speed of the indoor fan is lower than medium fan speed, it will operate at the set fan speed). After that, when the compressor runs for 2 minutes or the evaporator pipe temperature T... 蒸发器 If the temperature is below 8℃, the indoor fan speed will increase by one level. When the compressor has been running for 4 minutes or the evaporator pipe temperature T... 蒸发器 If the temperature is below 10℃, the initial speed control of the indoor fan of the fixed-frequency air conditioning system will be discontinued, and the indoor fan will be controlled to operate according to the fan speed set by the user.

[0082] The third process of adjusting the initial speed of the indoor fan is a third adjustment process that adjusts the initial speed of the indoor fan based on the current outdoor ambient temperature and in combination with the current running time of the compressor or the current indoor heat exchanger pipe temperature.

[0083] The following is combined Figure 5 The flowchart shown is a schematic diagram of an embodiment of the third adjustment process of adjusting the initial speed of the indoor fan according to the current outdoor ambient temperature and in combination with the current running time of the compressor or the current indoor heat exchanger tube temperature in the method of the present invention. The specific process of the third adjustment process of adjusting the initial speed of the indoor fan according to the current outdoor ambient temperature and in combination with the current running time of the compressor or the current indoor heat exchanger tube temperature in step S130 is further explained, including steps S510 to S560.

[0084] Step S510: If the current outdoor ambient temperature of the air conditioning system falls within a preset high-temperature range, specifically the third preset high-temperature range, then after determining that the indoor fan is operating at a predetermined initial speed, and while the indoor fan is operating at the predetermined initial speed, it is determined whether the current operating time of the compressor reaches a first set time or the current indoor heat exchanger pipe temperature of the air conditioning system is less than a preset third inner pipe temperature threshold; wherein the preset third inner pipe temperature threshold is less than a preset second inner pipe temperature threshold. The first set time is, for example, 2 minutes, and the third inner pipe temperature threshold is, for example, 6°C.

[0085] Step S520: If the condition is met, the initial speed of the indoor fan is increased by one level to obtain the second speed of the indoor fan, and the indoor fan is controlled to run at the adjusted second speed. Of course, if the condition is not met, the current control mode is maintained. The second speed of the indoor fan is the medium speed setting.

[0086] Step S530: Then, determine whether the current operating time of the compressor reaches a third preset time or the current indoor heat exchanger pipe temperature of the air conditioning system is less than a preset second inner pipe temperature threshold; wherein the preset third preset time is greater than a preset first preset time and less than a preset second preset time. For example, the third preset time is 3 minutes, and the second inner pipe temperature threshold is 8°C.

[0087] Step S540: If the condition is met, the first speed of the indoor fan is increased by one level to obtain the third speed of the indoor fan, and the indoor fan is controlled to run at the adjusted third speed. Of course, if the condition is not met, the current control mode is maintained. The third speed of the indoor fan is like the high speed setting.

[0088] Step S550: Then, determine whether the current operating time of the compressor reaches a fourth preset time or the current indoor heat exchanger pipe temperature of the air conditioning system is less than a preset first inner pipe temperature threshold; wherein the preset fourth preset time is greater than a preset second preset time. The first preset time is, for example, 2 minutes; the second preset time is, for example, 4 minutes; the third preset time is, for example, 3 minutes; the fourth preset time is, for example, 5 minutes; the first inner pipe temperature threshold is, for example, 10°C; the second inner pipe temperature threshold is, for example, 8°C; and the third inner pipe temperature threshold is, for example, 6°C.

[0089] Step S560: If satisfied, adjust the second speed of the indoor fan to the set speed of the indoor fan, so as to determine the set speed of the indoor fan as the current speed of the indoor fan, and control the indoor fan to run according to the adjusted set speed of the indoor fan; of course, if not satisfied, continue to maintain the current control mode.

[0090] Specifically, such as Figure 12 As shown, the control method for high-temperature cooling operation of a fixed-frequency air conditioning system further includes: in step 53, when the outdoor ambient temperature T... 外环 When in high-temperature zone 3, the indoor fan of the fixed-frequency air conditioning system initially operates at a low speed by default. After the compressor has been running for 2 minutes or the evaporator pipe temperature T... 蒸发器 If the temperature is below 6℃, the indoor fan speed will increase by one level. When the compressor has been running for 3 minutes or the evaporator pipe temperature T... 蒸发器 If the temperature is below 8℃, the indoor fan speed will increase by one level. When the compressor has been running for 5 minutes or the evaporator temperature is below 10℃, the initial speed control of the indoor fan in the fixed-frequency air conditioning system will be discontinued, and the indoor fan will be controlled to operate according to the user-set fan speed.

[0091] The fourth process of adjusting the initial speed of the indoor fan is a fourth adjustment process that adjusts the initial speed of the indoor fan based on the current outdoor ambient temperature and in combination with the current running time of the compressor or the current indoor heat exchanger pipe temperature.

[0092] The following is combined with Figure 6 The flowchart shown is a schematic diagram of an embodiment of the fourth adjustment process of adjusting the initial speed of the indoor fan according to the current outdoor ambient temperature and in combination with the current running time of the compressor or the current indoor heat exchanger tube temperature in the method of the present invention. The specific process of the fourth adjustment process of adjusting the initial speed of the indoor fan according to the current outdoor ambient temperature and in combination with the current running time of the compressor or the current indoor heat exchanger tube temperature in step S130 is further explained, including steps S610 to S660.

[0093] Step S610: If the current outdoor ambient temperature of the air conditioning system falls within a preset high-temperature range, specifically the fourth high-temperature range, then after determining that the indoor fan is running at a predetermined initial speed, and while the indoor fan is running at the predetermined initial speed, it is determined whether the current operating time of the compressor reaches a sixth preset time or the current indoor heat exchanger pipe temperature of the air conditioning system is less than a preset fourth inner pipe temperature threshold. The preset sixth preset time is less than the preset first preset time, and the preset fourth inner pipe temperature threshold is less than the preset third inner pipe temperature threshold. For example, the first preset time is 2 minutes, the sixth preset time is 30 seconds, the third inner pipe temperature threshold is 6°C, and the fourth inner pipe temperature threshold is 4°C.

[0094] Step S620: If the conditions are met, then the initial speed of the indoor fan is increased by one level to obtain the fourth speed of the indoor fan, and the indoor fan is controlled to operate at the adjusted fourth speed. Otherwise, the current control mode is maintained. The fourth speed of the indoor fan is, for example, the low fan speed.

[0095] Step S630: Then, determine whether the current running time of the compressor reaches the third set time or the current indoor heat exchanger tube temperature of the air conditioning system is less than the preset third inner tube temperature threshold; wherein, the third set time is such as 3 minutes, and the third inner tube temperature threshold is such as 6°C.

[0096] Step S640: If the conditions are met, the fourth speed of the indoor fan is increased by one level to obtain the fifth speed of the indoor fan, and the indoor fan is controlled to operate at the adjusted fifth speed. If the conditions are not met, the current control mode is maintained. The fifth speed of the indoor fan is, for example, the medium fan speed.

[0097] Step S650: Then, determine whether the current operating time of the compressor reaches a fourth set time or the current indoor heat exchanger pipe temperature of the air conditioning system is less than a preset first inner pipe temperature threshold. The fourth set time is, for example, 5 minutes, and the first inner pipe temperature threshold is, for example, 10°C.

[0098] Step S660: If satisfied, adjust the fifth speed of the indoor fan to the set speed of the indoor fan, so as to determine the set speed of the indoor fan as the current speed of the indoor fan, and control the indoor fan to run according to the adjusted set speed of the indoor fan; of course, if not satisfied, continue to maintain the current control mode.

[0099] Specifically, such as Figure 12 As shown, the control method for high-temperature cooling operation of a fixed-frequency air conditioning system further includes: in step 54, when the outdoor ambient temperature T... 外环 When the system is in high-temperature zone 4, after the indoor fan of the fixed-frequency air conditioning system is not turned on, the compressor will run for 30 seconds or the evaporator pipe temperature T will be reached. 蒸发器 If the temperature is below 4℃, the indoor fan will operate at its lowest speed. When the compressor has been running for 3 minutes or the evaporator pipe temperature reaches T... 蒸发器 If the temperature is below 6℃, the indoor fan speed should be increased by one level. When the compressor has been running for 5 minutes or the evaporator pipe temperature T... 蒸发器 If the temperature is below 10℃, the initial speed control of the indoor fan of the fixed-frequency air conditioning system will be discontinued, and the indoor fan will be controlled to operate according to the fan speed set by the user.

[0100] By controlling the indoor fan speed in the above manner, it can be ensured that the fixed-frequency air conditioning system will not experience high-pressure overshoot and high-pressure protection shutdown during the start-up phase in high-temperature zones due to the large pressure balance load of the fixed-frequency air conditioning system.

[0101] In the solution of this invention, the outdoor ambient temperature T of the fixed-frequency air conditioning system is detected after the fixed-frequency air conditioner is turned on for cooling. 外环 When the outdoor ambient temperature T 外环 A temperature >40℃ indicates that the fixed-frequency air conditioning system is in high-temperature cooling mode; further analysis is needed based on the outdoor ambient temperature T. 外环 The temperature is divided into high-temperature zones 1 to 4, based on the outdoor ambient temperature T. 外环 The initial fan speed of the indoor fan of the fixed-frequency air conditioning system is determined based on the different high-temperature zones it is located in, serving as the initial fan speed when the system starts up. This avoids excessively high indoor fan speed and evaporation pressure, which could lead to a heavy load on the fixed-frequency air conditioning system and cause pressure overshoot during startup. Furthermore, the compressor running time and the indoor evaporator pipe temperature T are considered. 蒸发器 Confirm that you are exiting control of the initial fan speed of the indoor fan to ensure that the indoor cooling output of the fixed-frequency air conditioning system guarantees the room's cooling effect.

[0102] In step S140, after stopping the initial speed adjustment of the indoor fan, while controlling the indoor fan to operate at the current speed obtained by the adjustment, the current opening degree of the throttling device of the air conditioning system is corrected according to the current outdoor heat exchanger pipe temperature of the air conditioning system and the current speed of the indoor fan to obtain a new current opening degree of the throttling device; and the throttling device is controlled to operate at the new current opening degree of the throttling device.

[0103] The present invention provides a control method for high-temperature cooling operation of a fixed-frequency air conditioning system. This method determines the indoor fan speed at startup based on the load of the fixed-frequency air conditioning system, and adjusts the flow rate of the fixed-frequency air conditioning system according to the outdoor condenser pipe temperature and the indoor fan speed. This reduces the high pressure of the fixed-frequency air conditioning system, preventing high-pressure protection shutdowns during cooling operation under high-temperature conditions, ensuring stable operation of the fixed-frequency air conditioning system under high-temperature conditions, and improving the comfort of using the fixed-frequency air conditioning system. Therefore, by defining different loads based on varying outdoor ambient temperatures and determining the initial indoor fan speed for each outdoor load, the problem of high-pressure protection due to excessive starting load in fixed-frequency air conditioning systems is solved. Specifically, this addresses the issue of pressure overshoot during startup in ultra-high outdoor temperatures causing high-temperature protection shutdown of the fixed-frequency air conditioning system, and also resolves the problem of the fixed-frequency air conditioning system failing to operate normally at high outdoor temperatures. Simultaneously, the indoor fan speed is determined based on compressor running time and indoor evaporator pipe temperature to ensure cooling output. Further adjustments are made based on outdoor condenser pipe temperature and indoor fan speed settings to the electronic expansion valve opening. By controlling the flow rate and indoor fan speed, stable cooling operation under high-temperature conditions is ensured, guaranteeing both cooling output and overall system reliability. This reduces the high pressure of the fixed-frequency air conditioning system under high-temperature cooling conditions, lowering energy consumption while maintaining effective high-temperature cooling.

[0104] In some embodiments, after stopping the initial speed adjustment of the indoor fan in step S140, while controlling the indoor fan to operate at the current speed of the indoor fan obtained by the adjustment, the current opening degree of the throttling device of the air conditioning system is corrected according to the current outdoor heat exchanger pipe temperature of the air conditioning system and the current speed of the indoor fan to obtain a new current opening degree of the throttling device. For the specific process of obtaining the new current opening degree of the throttling device, please refer to the following exemplary description.

[0105] The following is combined with Figure 7 The schematic diagram shows an embodiment of the method of the present invention in which the current opening degree of the throttling device is corrected according to the current outdoor heat exchanger tube temperature and the current speed of the indoor fan. The specific process of correcting the current opening degree of the throttling device according to the current outdoor heat exchanger tube temperature and the current speed of the indoor fan in step S140 is further explained, including steps S710 to S730.

[0106] Step S710: After stopping the initial speed adjustment of the indoor fan, while controlling the indoor fan to operate at the adjusted current speed, determine whether the current outdoor heat exchanger pipe temperature of the air conditioning system is greater than a preset outdoor pipe high temperature threshold. The preset outdoor pipe high temperature threshold is, for example, 50°C.

[0107] Step S720: If it is determined that the current outdoor heat exchanger tube temperature of the air conditioning system is greater than the preset high temperature threshold of the outdoor tube, then the correction value of the current opening degree of the throttling device is calculated based on the current outdoor heat exchanger tube temperature of the air conditioning system and the current speed of the indoor fan; of course, if it is determined that the current outdoor heat exchanger tube temperature of the air conditioning system is not greater than the preset high temperature threshold of the outdoor tube, then the throttling device of the air conditioning system is controlled to maintain the current opening degree of the throttling device.

[0108] In some embodiments, the current speed of the indoor fan corresponds to any one of the preset first wind speed, preset second wind speed, preset third wind speed, and preset fourth wind speed. The first wind speed is such as low wind speed, the second wind speed is such as medium wind speed, the third wind speed is such as high wind speed, and the fourth wind speed is such as super strong wind speed. The speed corresponding to the preset first wind speed, the speed corresponding to the preset second wind speed, the speed corresponding to the preset third wind speed, and the speed corresponding to the preset fourth wind speed increase sequentially.

[0109] In step S720, when it is determined that the current outdoor heat exchanger tube temperature of the air conditioning system is greater than the preset high temperature threshold of the outdoor tube, the correction value of the current opening degree of the throttling device is calculated based on the current outdoor heat exchanger tube temperature of the air conditioning system and the current speed of the indoor fan. The specific process is illustrated in the following exemplary description.

[0110] The following is combined with Figure 8 The flowchart shown is a schematic diagram of an embodiment of the method of the present invention, which calculates the correction value of the current opening degree of the throttling device based on the current outdoor heat exchanger tube temperature and the current speed of the indoor fan. The specific process of calculating the correction value of the current opening degree of the throttling device based on the current outdoor heat exchanger tube temperature and the current speed of the indoor fan in step S720 is further explained, including steps S810 to S830.

[0111] Step S810: Determine the wind speed corresponding to the current rotation speed of the indoor fan, and record it as the current wind speed of the indoor fan.

[0112] Step S820: Based on the correspondence between the set gear coefficient and the set gear, determine the set gear coefficient corresponding to the set gear that is the same as the current wind speed of the indoor fan in the correspondence as the current gear coefficient corresponding to the current wind speed of the indoor fan, and record it as the current gear coefficient of the indoor fan.

[0113] Step S830: Determine the difference between the current outdoor heat exchanger pipe temperature of the air conditioning system and the preset temperature threshold, and determine the product of the difference and the current gear coefficient of the indoor fan as the correction value of the current opening degree of the throttling device.

[0114] Specifically, such as Figure 12 As shown, the control method for high-temperature cooling operation of a fixed-frequency air conditioning system further includes: in step 6, when the outdoor condenser tube temperature T... 外管 Too high, such as outdoor condenser tube temperature T 外管 When the temperature is >50℃, further calculations should be made based on the outdoor condenser tube temperature T. 外管 The opening of the electronic expansion valve is adjusted based on the temperature and indoor fan speed. Specifically, the opening of the electronic expansion valve is corrected by the following calculation: P' = P + (T 外管 -A)×B, to avoid excessive operating load on the fixed-frequency air conditioning system.

[0115] Where P' is the corrected opening degree of the electronic expansion valve, and P is the current opening degree of the electronic expansion valve. A is a constant, and in this invention, the preset value A is specifically 50°C; B is the indoor fan speed coefficient, and in this invention, the preset value B is specifically 4 for the high fan speed, 3 for the high fan speed, 2 for the medium fan speed, and 1 for the low fan speed. This formula only calculates the numerical value and does not consider units; the fixed-frequency air conditioning system reads the relevant parameters only by reading the numerical value, regardless of the unit.

[0116] Step S730: The current opening degree of the throttling device and the sum of the correction value of the current opening degree of the throttling device are determined as the new current opening degree of the throttling device, so as to realize the correction of the current opening degree of the throttling device of the air conditioning system.

[0117] Specifically, such as Figure 12 As shown, the control method for high-temperature cooling operation of a fixed-frequency air conditioning system further includes: Step 6, when the outdoor condenser tube temperature T... 外管 Too high, such as outdoor condenser tube temperature T 外管 When the temperature is >50℃, further calculations should be made based on the outdoor condenser tube temperature T. 外管 Adjust the temperature and indoor fan speed to control the opening of the electronic expansion valve and avoid excessive load on the fixed-frequency air conditioning system.

[0118] In the solution of this invention, based on the compressor running time and the indoor evaporator tube temperature T... 蒸发器 Confirm that the control of the initial fan speed of the indoor fan is deactivated to ensure that the indoor cooling capacity output of the fixed-frequency air conditioning system guarantees the room's cooling effect. Simultaneously, during the operation of the fixed-frequency air conditioning system, the outdoor condenser pipe temperature T should be considered. 外管 The indoor fan damper adjusts the opening of the electronic expansion valve to prevent temperature fluctuations in the outdoor condenser pipe of the fixed-frequency air conditioning system from affecting the opening. 外管 Excessive pressure can cause the pressure in a fixed-frequency air conditioning system to rise. Reducing the operating load of the fixed-frequency air conditioning system can prevent it from triggering high-pressure protection and reduce its power consumption, thus ensuring both the comfort of using the fixed-frequency air conditioning system and achieving energy-saving operation.

[0119] In some embodiments, after stopping the initial speed adjustment of the indoor fan in step S140, while controlling the indoor fan to operate at the current speed of the indoor fan obtained by the adjustment, the current opening degree of the throttling device of the air conditioning system is corrected according to the current outdoor heat exchanger pipe temperature of the air conditioning system and the current speed of the indoor fan to obtain a new current opening degree of the throttling device. The process further includes: periodically correcting the current opening degree of the throttling device in a cyclical manner.

[0120] The following is combined with Figure 9 The schematic diagram shows an embodiment of the method of the present invention in which the current opening of the throttling device is periodically corrected. The specific process of periodically correcting the current opening of the throttling device in step S140 is further explained, including steps S910 to S920.

[0121] Step S910: When it is determined that the current outdoor heat exchanger tube temperature of the air conditioning system is greater than the preset high temperature threshold of the outer tube, a new correction value for the current opening of the throttling device is calculated based on the current outdoor heat exchanger tube temperature of the air conditioning system and the current speed of the indoor fan. After controlling the throttling device to run at the new current opening of the throttling device for a seventh set time, the process returns to: when it is determined that the current outdoor heat exchanger tube temperature of the air conditioning system is greater than the preset high temperature threshold of the outer tube, a new correction value for the current opening of the throttling device is calculated based on the current outdoor heat exchanger tube temperature of the air conditioning system and the current speed of the indoor fan.

[0122] Step S920 is repeated until the latest obtained current opening degree of the throttling device reaches the set maximum opening degree. At this point, the correction of the latest obtained current opening degree of the throttling device is stopped, and the throttling device is kept running at the latest obtained current opening degree.

[0123] Specifically, such as Figure 12 As shown, the control method for high-temperature cooling operation of a fixed-frequency air conditioning system further includes: in step 6, the opening degree of the electronic expansion valve is updated every 30 seconds until the opening degree of the electronic expansion valve reaches the maximum opening degree value, such as 480P.

[0124] Through the above controls, the outdoor condenser tube temperature T is controlled. 外管 The pressure will not rise too high, thus controlling the pressure of the fixed-frequency air conditioning system to prevent it from becoming too high. This makes the fixed-frequency air conditioning system more reliable and reduces energy consumption during high-temperature operation, allowing the fixed-frequency air conditioning system to operate stably in the high-temperature range and to operate more comfortably and energy-efficiently.

[0125] The solution of this invention involves detecting the outdoor ambient temperature T of the fixed-frequency air conditioning system after the fixed-frequency air conditioner is turned on for cooling. 外环 Outdoor condenser tube temperature T 外管 According to the outdoor ambient temperature T of the fixed-frequency air conditioning system 外环 Confirm whether the fixed-frequency air conditioning system is operating in the high-temperature cooling range; once the preset conditions are met (i.e., confirm that the fixed-frequency air conditioning system is operating in the high-temperature cooling range), adjust the outdoor ambient temperature T. 外环 Different initial fan speeds during startup of fixed-frequency air conditioning systems are used to prevent excessive starting loads that could lead to pressure overshoot and high-pressure protection shutdown. Furthermore, the indoor fan speed and outdoor condenser pipe temperature (T) are monitored. 外管 The value is used to correct the opening of the electronic expansion valve to prevent the outdoor condenser tube temperature T from rising. 外管 Excessive pressure in a fixed-frequency air conditioning system can cause it to shut down or further increase its load. This reduces the likelihood of the system shutting down due to high pressure protection, thus ensuring the comfort of the system while achieving energy-saving operation and extending its lifespan.

[0126] The technical solution of this embodiment determines the initial speed of the indoor fan based on the high-temperature zone of the outdoor environment when the outdoor ambient temperature is higher than the high-temperature threshold of the outer ring after the fixed-frequency air conditioning system is turned on for cooling. The initial speed of the indoor fan is then adjusted based on the compressor running time or the indoor heat exchanger pipe temperature. Furthermore, after the adjustment of the initial speed of the indoor fan is stopped, the opening of the electronic expansion valve is corrected based on the outdoor heat exchanger pipe temperature and the indoor fan speed when the outdoor heat exchanger pipe temperature is higher than the high-temperature threshold of the outer pipe. This allows the indoor fan speed to be determined based on the load of the fixed-frequency air conditioning system, and the flow rate of the fixed-frequency air conditioning system to be adjusted based on the outdoor condenser pipe temperature and the indoor fan speed. This reduces the high pressure of the fixed-frequency air conditioning system, ensuring stable operation under high-temperature conditions and improving the comfort of using the fixed-frequency air conditioning system.

[0127] According to embodiments of the present invention, a control device for a fixed-frequency air conditioning system, corresponding to a control method for a fixed-frequency air conditioning system, is also provided. See also... Figure 10 The diagram shows a structural schematic of an embodiment of the device of the present invention. The fixed-frequency air conditioning system includes: a compressor, an outdoor heat exchanger, an indoor heat exchanger, and a throttling device. An indoor fan is installed at the indoor heat exchanger. The fixed-frequency air conditioning system also includes a four-way valve, and an outdoor fan is installed at the outdoor heat exchanger. The exhaust port of the compressor, after passing through the second valve port of the four-way valve, the outdoor heat exchanger, the throttling device, and the indoor heat exchanger, is connected to the fourth valve port of the four-way valve; the third valve port of the four-way valve is connected to the suction port of the compressor. Specifically, Figure 11This is a schematic diagram of a fixed-frequency air conditioning system according to one embodiment. Figure 11 The fixed-frequency air conditioning system shown includes an outdoor side and an indoor side. The indoor side of the fixed-frequency air conditioning system is equipped with an indoor heat exchanger (such as an evaporator in cooling mode) and an indoor fan; a temperature sensor is installed inside the evaporator to detect the evaporator pipe temperature T. 蒸发器 The indoor fan system uses two axial flow fans, each with four fan speed settings: high, medium, and low. On the outdoor side of the fixed-frequency air conditioning system, there is a compressor, a four-way valve, an outdoor heat exchanger (i.e., the condenser in cooling mode), a throttling device 1 (such as an electronic expansion valve), and the outdoor fan. A temperature sensor is installed inside the condenser to detect the condenser pipe temperature, i.e., the outdoor condenser pipe temperature T. 外管 .like Figure 11 As shown, the compressor's exhaust port is connected to the first port of the four-way valve; the second port of the four-way valve, after passing through the outdoor heat exchanger, the electronic expansion valve, and the indoor heat exchanger, is connected to the third port of the four-way valve; and the fourth port of the four-way valve is connected to the compressor's intake port.

[0128] In the solution of the present invention, such as Figure 10 As shown, the control device of the fixed-frequency air conditioning system includes: an acquisition unit 102 and a control unit 104.

[0129] The acquisition unit 102 is configured to acquire the outdoor ambient temperature of the environment where the air conditioning system is located after the fixed-frequency air conditioning system is turned on for cooling, and record it as the current outdoor ambient temperature of the air conditioning system (e.g., outdoor ambient temperature T). 外环 ); Obtain the pipe temperature of the indoor heat exchanger of the air conditioning system, and record it as the current indoor heat exchanger pipe temperature of the air conditioning system (e.g., indoor evaporator pipe temperature T). 蒸发器 ); Obtain the pipe temperature of the outdoor heat exchanger of the air conditioning system, and record it as the current outdoor heat exchanger pipe temperature of the air conditioning system (e.g., outdoor condenser pipe temperature T). 外管 The system obtains the cumulative running time of the compressor in the air conditioning system and records it as the current running time of the compressor. For the specific functions and processing of this acquisition unit 102, please refer to step S110.

[0130] The control unit 104 is configured to determine the initial speed of the indoor fan of the air conditioning system based on the current outdoor ambient temperature of the air conditioning system; and to control the indoor fan to operate at the determined initial speed. The specific functions and processing of the control unit 104 are further described in step S120.

[0131] In some embodiments, the control unit 104 determines the initial speed of the indoor fan of the air conditioning system based on the current outdoor ambient temperature of the air conditioning system, including:

[0132] The control unit 104 is further configured to determine whether the current outdoor ambient temperature of the air conditioning system is greater than a preset outer ring high temperature threshold. The specific functions and processing of the control unit 104 are further described in step S210. The preset outer ring high temperature threshold is, for example, 40°C.

[0133] The control unit 104 is further configured to determine the range within a preset high-temperature range if the current outdoor ambient temperature of the air conditioning system is determined to be greater than a preset outer-ring high-temperature threshold. The specific functions and processing of this control unit 104 are further described in step S220. Alternatively, if the current outdoor ambient temperature of the air conditioning system is determined not to be greater than the preset outer-ring high-temperature threshold, the process returns to continue acquiring the current outdoor ambient temperature of the air conditioning system.

[0134] The control unit 104 is further configured to, based on the correspondence between a set temperature range and a set initial speed, determine the set initial speed corresponding to the set temperature range that is the same as the range within a preset high temperature range to which the current outdoor ambient temperature of the air conditioning system belongs, as the initial speed of the indoor fan corresponding to the range within the preset high temperature range to which the current outdoor ambient temperature of the air conditioning system belongs. The specific functions and processing of this control unit 104 are further described in step S230.

[0135] Specifically, Figure 12 This is a flowchart illustrating an embodiment of a control method for high-temperature cooling operation of a fixed-frequency air conditioning system. Figure 12 As shown, the control method for high-temperature cooling operation of a fixed-frequency air conditioning system includes:

[0136] Step 1: Start the fixed-frequency air conditioning system in cooling mode, then proceed to Step 2.

[0137] Step 2: Begin detecting the outdoor ambient temperature T of the fixed-frequency air conditioning system. 外环 Then proceed to step 3.

[0138] Step 3: Determine if the outdoor ambient temperature T is met. 外环 >40℃: If so, proceed to step 4; otherwise, return to step 2.

[0139] Step 4, when the outdoor ambient temperature T is met 外环 If the temperature is >40℃, the fixed-frequency air conditioning system is considered to be operating under high-temperature cooling conditions. Then proceed to step 5.

[0140] Step 5: Further adjust according to different outdoor ambient temperatures T 外环Differentiate between high-temperature zones 1 to 4. Specifically, based on the differentiation results, selectively execute steps 51, 52, 53, and 54, and then execute step 6.

[0141] In some embodiments, the preset high temperature range includes: a preset first high temperature range, a preset second high temperature range, a preset third high temperature range, and a preset fourth high temperature range, where the first high temperature range is such as high temperature zone 1, the second high temperature range is such as high temperature zone 2, the third high temperature range is such as high temperature zone 3, and the fourth high temperature range is such as high temperature zone 4; wherein, the lower limit of the preset first high temperature range is greater than a preset outer ring high temperature threshold, the lower limit of the preset second high temperature range is greater than the upper limit of the preset first high temperature range, the lower limit of the preset third high temperature range is greater than the upper limit of the preset second high temperature range, and the lower limit of the preset fourth high temperature range is greater than the upper limit of the preset third high temperature range.

[0142] Specifically, such as Figure 12 As shown, the control method for high-temperature cooling operation of a fixed-frequency air conditioning system further includes: in step 5, according to different outdoor ambient temperatures T 外环 For a detailed explanation of how to distinguish between high-temperature zones 1 to 4, please refer to the example shown in Table 1.

[0143] Table 1: Temperatures under different outdoor ambient temperatures (T) 外环 Correspondence table with different high temperature zones

[0144] interval Temperature range High temperature zone 1 <![CDATA[40℃<T 外环 ≤45℃]]> High temperature zone 2 <![CDATA[45℃<T 外环 ≤50℃]]> High temperature zone 3 <![CDATA[50℃<T 外环 ≤55℃]]> High temperature zone 4 <![CDATA[55℃<T 外环 ]]>

[0145] In the correspondence between the set temperature range and the set initial speed, the set initial speed includes: a preset first wind speed, a preset second wind speed, a preset third wind speed, and a preset fourth wind speed. The first wind speed is such as a low wind speed, the second wind speed is such as a medium wind speed, the third wind speed is such as a high wind speed, and the fourth wind speed is such as a super strong wind speed. The speed corresponding to the preset first wind speed, the speed corresponding to the preset second wind speed, the speed corresponding to the preset third wind speed, and the speed corresponding to the preset fourth wind speed increase sequentially.

[0146] The control unit 104, based on the correspondence between the set temperature range and the set initial speed, determines the set initial speed corresponding to the set temperature range that is the same as the range to which the current outdoor ambient temperature of the air conditioning system belongs within the preset high temperature range, as the initial speed of the indoor fan corresponding to the range to which the current outdoor ambient temperature of the air conditioning system belongs within the preset high temperature range. This includes any of the following determination scenarios for the initial speed of the indoor fan: the first determination scenario for the initial speed of the indoor fan, the second determination scenario for the initial speed of the indoor fan, the third determination scenario for the initial speed of the indoor fan, and the fourth determination scenario for the initial speed of the indoor fan.

[0147] In one scenario, the initial speed of the indoor fan is determined as follows: the control unit 104 is further configured to determine the initial speed of the indoor fan as a preset third fan speed if the current outdoor ambient temperature of the air conditioning system falls within a preset high-temperature range, specifically a preset first high-temperature range. If a set fan speed is received from the indoor fan and the set fan speed is lower than the preset third fan speed, the initial speed of the indoor fan is determined to be the set fan speed. Conversely, if no set fan speed is received from the indoor fan, or if the received set fan speed is not lower than the preset third fan speed, the initial speed of the indoor fan is determined to be the preset third fan speed. Specifically, as shown... Figure 12 As shown, the control method for high-temperature cooling operation of a fixed-frequency air conditioning system further includes: Step 51, when the outdoor ambient temperature T... 外环 When in high temperature zone 1, the initial speed of the indoor fan of the fixed frequency air conditioning system is controlled by default to high fan speed (if the set fan speed of the indoor fan is lower than the high fan speed, it will run at the set fan speed).

[0148] The second scenario for determining the initial speed of the indoor fan: The control unit 104 is further configured to determine the initial speed of the indoor fan as a preset second high-temperature range if the current outdoor ambient temperature of the air conditioning system falls within a preset high-temperature range. Specifically, if a set fan speed is received from the indoor fan and the set fan speed is lower than the preset second fan speed, the initial speed of the indoor fan is determined to be the set fan speed. Conversely, if no set fan speed is received from the indoor fan, or if the received set fan speed is not lower than the preset second fan speed, the initial speed of the indoor fan is determined to be the preset second fan speed. Specifically, as... Figure 12 As shown, the control method for high-temperature cooling operation of a fixed-frequency air conditioning system further includes: Step 52, when the outdoor ambient temperature T... 外环 When in high temperature zone 2, the initial speed of the indoor fan of the fixed frequency air conditioning system is set to medium speed by default (if the set speed of the indoor fan is lower than the medium speed, it will run at the set speed).

[0149] The third scenario for determining the initial speed of the indoor fan: The control unit 104 is further configured to determine the initial speed of the indoor fan as a preset first fan speed if the current outdoor ambient temperature of the air conditioning system falls within a preset high-temperature range, specifically a preset third high-temperature range. Figure 12 As shown, the control method for high-temperature cooling operation of a fixed-frequency air conditioning system further includes: Step 53, when the outdoor ambient temperature T... 外环 When in high temperature zone 3, the initial speed of the indoor fan of the fixed frequency air conditioning system is set to low fan speed by default.

[0150] The fourth scenario for determining the initial speed of the indoor fan: Specifically, the control unit 104 is further configured to determine the initial speed of the indoor fan to be zero if the current outdoor ambient temperature of the air conditioning system falls within a preset high-temperature range, specifically the fourth high-temperature range; that is, to control the indoor fan not to start. Specifically, as follows... Figure 12 As shown, the control method for high-temperature cooling operation of a fixed-frequency air conditioning system further includes: Step 54, when the outdoor ambient temperature T... 外环 When in high temperature zone 4, the indoor fan of the fixed frequency air conditioning system should not be turned on.

[0151] The control unit 104 is further configured to, while controlling the indoor fan to operate at a determined initial speed, adjust the initial speed of the indoor fan based on the current outdoor ambient temperature of the air conditioning system, and in conjunction with the current operating time of the compressor of the air conditioning system or the current indoor heat exchanger pipe temperature of the air conditioning system, to obtain the current speed of the indoor fan; and control the indoor fan to operate at the adjusted current speed. The specific functions and processing of this control unit 104 are further described in step S130.

[0152] In some embodiments, the preset high temperature range includes: a preset first high temperature range, a preset second high temperature range, a preset third high temperature range, and a preset fourth high temperature range, where the first high temperature range is such as high temperature zone 1, the second high temperature range is such as high temperature zone 2, the third high temperature range is such as high temperature zone 3, and the fourth high temperature range is such as high temperature zone 4; wherein, the lower limit of the preset first high temperature range is greater than a preset outer ring high temperature threshold, the lower limit of the preset second high temperature range is greater than the upper limit of the preset first high temperature range, the lower limit of the preset third high temperature range is greater than the upper limit of the preset second high temperature range, and the lower limit of the preset fourth high temperature range is greater than the upper limit of the preset third high temperature range.

[0153] The control unit 104, while controlling the indoor fan to operate at a determined initial speed, adjusts the initial speed of the indoor fan based on the current outdoor ambient temperature of the air conditioning system, combined with the current operating time of the compressor of the air conditioning system or the current indoor heat exchanger pipe temperature of the air conditioning system, to obtain the current speed of the indoor fan. This adjustment includes any of the following processes: a first process, a second process, a third process, or a fourth process.

[0154] The first process of adjusting the initial speed of the indoor fan, namely, adjusting the initial speed of the indoor fan based on the current outdoor ambient temperature and the current running time of the compressor or the current indoor heat exchanger pipe temperature, is as follows:

[0155] The control unit 104 is further configured to, if the current outdoor ambient temperature of the air conditioning system falls within a preset high-temperature range (specifically a first high-temperature range), then, after determining that the indoor fan is running at a predetermined initial speed, and while the indoor fan is running at the predetermined initial speed, determine whether the current operating time of the compressor has reached a first set time or the current indoor heat exchanger pipe temperature of the air conditioning system is less than a preset first inner pipe temperature threshold. The specific functions and processing of this control unit 104 are further described in step S310. The first set time is, for example, 2 minutes, and the first inner pipe temperature threshold is, for example, 10°C.

[0156] The control unit 104 is further configured to, if satisfied, adjust the initial speed of the indoor fan to the set fan speed, thereby determining the set fan speed as the current speed of the indoor fan, and controlling the indoor fan to operate at the adjusted set fan speed; otherwise, it maintains the current control mode. The specific functions and processing of this control unit 104 are further described in step S320.

[0157] Specifically, such as Figure 12 As shown, the control method for high-temperature cooling operation of a fixed-frequency air conditioning system further includes: in step 51, when the outdoor ambient temperature T... 外环 When in high-temperature zone 1, the initial speed of the indoor fan of the fixed-frequency air conditioning system is set to high fan speed by default (if the set fan speed of the indoor fan is lower than high fan speed, it will operate at the set fan speed). After that, when the compressor runs for 2 minutes or the evaporator pipe temperature T... 蒸发器 If the temperature is below 10℃, the initial speed control of the indoor fan of the fixed-frequency air conditioning system will be discontinued, and the indoor fan will be controlled to operate according to the fan speed set by the user.

[0158] The second method for adjusting the initial speed of the indoor fan, namely, adjusting the initial speed of the indoor fan based on the current outdoor ambient temperature and in conjunction with the current running time of the compressor or the current indoor heat exchanger pipe temperature, is as follows:

[0159] The control unit 104 is further configured to, if the current outdoor ambient temperature of the air conditioning system falls within a preset high-temperature range and is within a preset second high-temperature range, then, after determining that the indoor fan is running at a predetermined initial speed, and while the indoor fan is running at the predetermined initial speed, determine whether the current operating time of the compressor has reached a first set time or the current indoor heat exchanger pipe temperature of the air conditioning system is less than a preset second inner pipe temperature threshold; wherein the preset second inner pipe temperature threshold is less than a preset first inner pipe temperature threshold. The specific functions and processing of this control unit 104 are further described in step S410. The first set time is, for example, 2 minutes; the first inner pipe temperature threshold is, for example, 10°C; and the second inner pipe temperature threshold is, for example, 8°C.

[0160] The control unit 104 is further configured to, if satisfied, increase the initial speed of the indoor fan by one level to obtain the first speed of the indoor fan, and control the indoor fan to operate at the adjusted first speed; otherwise, it will maintain the current control mode; wherein, the first speed of the indoor fan is, for example, the high fan speed. The specific functions and processing of the control unit 104 are further described in step S420.

[0161] The control unit 104 is further configured to determine whether the current operating time of the compressor reaches a second preset time or the current indoor heat exchanger pipe temperature of the air conditioning system is less than a preset first inner pipe temperature threshold; wherein the preset second preset time is greater than the preset first preset time. The specific functions and processing of the control unit 104 are further described in step S430. The first preset time is, for example, 2 minutes, the second preset time is, for example, 4 minutes, and the second inner pipe temperature threshold is, for example, 8°C.

[0162] The control unit 104 is further configured to, if satisfied, adjust the first speed of the indoor fan to the set wind speed of the indoor fan, thereby determining the set wind speed of the indoor fan as the current speed of the indoor fan, and controlling the indoor fan to operate at the adjusted set wind speed; of course, if not satisfied, the current control mode is maintained. The specific functions and processing of this control unit 104 are further described in step S440.

[0163] Specifically, such as Figure 12 As shown, the control method for high-temperature cooling operation of a fixed-frequency air conditioning system further includes: in step 52, when the outdoor ambient temperature T... 外环 When in high-temperature zone 2, the initial speed of the indoor fan of the fixed-frequency air conditioning system is set to medium fan speed by default (if the set fan speed of the indoor fan is lower than medium fan speed, it will operate at the set fan speed). After that, when the compressor runs for 2 minutes or the evaporator pipe temperature T...蒸发器 If the temperature is below 8℃, the indoor fan speed will increase by one level. When the compressor has been running for 4 minutes or the evaporator pipe temperature T... 蒸发器 If the temperature is below 10℃, the initial speed control of the indoor fan of the fixed-frequency air conditioning system will be discontinued, and the indoor fan will be controlled to operate according to the fan speed set by the user.

[0164] The third method for adjusting the initial speed of the indoor fan, namely, adjusting the initial speed of the indoor fan based on the current outdoor ambient temperature and in conjunction with the current running time of the compressor or the current indoor heat exchanger pipe temperature, is as follows:

[0165] The control unit 104 is further configured to, if the current outdoor ambient temperature of the air conditioning system falls within a preset high-temperature range and is within a preset third high-temperature range, then, after determining that the indoor fan is running at a predetermined initial speed, and while the indoor fan is running at the predetermined initial speed, determine whether the current operating time of the compressor has reached a first set time or the current indoor heat exchanger pipe temperature of the air conditioning system is less than a preset third inner pipe temperature threshold; wherein the preset third inner pipe temperature threshold is less than a preset second inner pipe temperature threshold. The specific functions and processing of this control unit 104 are further described in step S510. The first set time is, for example, 2 minutes, and the third inner pipe temperature threshold is, for example, 6°C.

[0166] The control unit 104 is further configured to, if satisfied, increase the initial speed of the indoor fan by one level to obtain a second speed of the indoor fan, and control the indoor fan to operate at the adjusted second speed; otherwise, it will maintain the current control mode; wherein, the second speed of the indoor fan is, for example, the medium fan speed. The specific functions and processing of the control unit 104 are further described in step S520.

[0167] The control unit 104 is further configured to determine whether the current operating time of the compressor reaches a third preset time or the current indoor heat exchanger pipe temperature of the air conditioning system is less than a preset second inner pipe temperature threshold; wherein the preset third preset time is greater than a preset first preset time and less than a preset second preset time. The specific functions and processing of the control unit 104 are further described in step S530. The third preset time is, for example, 3 minutes, and the second inner pipe temperature threshold is, for example, 8°C.

[0168] The control unit 104 is further configured to, if satisfied, increase the first speed of the indoor fan by one level to obtain a third speed of the indoor fan, and control the indoor fan to operate at the adjusted third speed; otherwise, it will maintain the current control mode; wherein, the third speed of the indoor fan is, for example, the high fan speed. The specific functions and processing of the control unit 104 are further described in step S540.

[0169] The control unit 104 is further configured to determine whether the current operating time of the compressor reaches a fourth preset time or the current indoor heat exchanger pipe temperature of the air conditioning system is less than a preset first inner pipe temperature threshold; wherein the preset fourth preset time is greater than a preset second preset time. The specific functions and processing of the control unit 104 are further described in step S550. The first preset time is, for example, 2 minutes; the second preset time is, for example, 4 minutes; the third preset time is, for example, 3 minutes; the fourth preset time is, for example, 5 minutes; the first inner pipe temperature threshold is, for example, 10°C; the second inner pipe temperature threshold is, for example, 8°C; and the third inner pipe temperature threshold is, for example, 6°C.

[0170] The control unit 104 is further configured to, if satisfied, adjust the second speed of the indoor fan to the set speed of the indoor fan, thereby determining the set speed of the indoor fan as the current speed of the indoor fan, and controlling the indoor fan to operate at the adjusted set speed; otherwise, it continues to maintain the current control mode. The specific functions and processing of this control unit 104 are further described in step S560.

[0171] Specifically, such as Figure 12 As shown, the control method for high-temperature cooling operation of a fixed-frequency air conditioning system further includes: in step 53, when the outdoor ambient temperature T... 外环 When in high-temperature zone 3, the indoor fan of the fixed-frequency air conditioning system initially operates at a low speed by default. After the compressor has been running for 2 minutes or the evaporator pipe temperature T... 蒸发器 If the temperature is below 6℃, the indoor fan speed will increase by one level. When the compressor has been running for 3 minutes or the evaporator pipe temperature T... 蒸发器 If the temperature is below 8℃, the indoor fan speed will increase by one level. When the compressor has been running for 5 minutes or the evaporator temperature is below 10℃, the initial speed control of the indoor fan in the fixed-frequency air conditioning system will be discontinued, and the indoor fan will be controlled to operate according to the user-set fan speed.

[0172] The fourth process for adjusting the initial speed of the indoor fan, namely, adjusting the initial speed of the indoor fan based on the current outdoor ambient temperature and in conjunction with the current running time of the compressor or the current indoor heat exchanger pipe temperature, is as follows:

[0173] The control unit 104 is further configured to, if the current outdoor ambient temperature of the air conditioning system falls within a preset high-temperature range and is within a preset fourth high-temperature range, then, after determining that the indoor fan is running at a predetermined initial speed, and while the indoor fan is running at the predetermined initial speed, determine whether the current operating time of the compressor reaches a sixth preset time or the current indoor heat exchanger pipe temperature of the air conditioning system is less than a preset fourth inner pipe temperature threshold; wherein, the preset sixth preset time is less than the preset first preset time, and the preset fourth inner pipe temperature threshold is less than the preset third inner pipe temperature threshold. The specific functions and processing of this control unit 104 are further described in step S610. The first preset time is, for example, 2 minutes; the sixth preset time is, for example, 30 seconds; the third inner pipe temperature threshold is, for example, 6°C; and the fourth inner pipe temperature threshold is, for example, 4°C.

[0174] The control unit 104 is further configured to, if a certain condition is met, adjust the initial speed of the indoor fan by one level to obtain a fourth speed of the indoor fan, and control the indoor fan to operate at the adjusted fourth speed; otherwise, it will maintain the current control mode. The specific functions and processing of this control unit 104 are further described in step S620. The fourth speed of the indoor fan is, for example, the low fan speed.

[0175] The control unit 104 is further configured to determine whether the current operating time of the compressor reaches a third set time or the current indoor heat exchanger pipe temperature of the air conditioning system is less than a preset third inner pipe temperature threshold. The specific functions and processing of the control unit 104 are further described in step S630. The third set time is, for example, 3 minutes, and the third inner pipe temperature threshold is, for example, 6°C.

[0176] The control unit 104 is further configured to, if satisfied, increase the fourth speed of the indoor fan by one level to obtain the fifth speed of the indoor fan, and control the indoor fan to operate at the adjusted fifth speed; otherwise, it will maintain the current control mode; wherein the fifth speed of the indoor fan is, for example, the medium fan speed. The specific functions and processing of the control unit 104 are further described in step S640.

[0177] The control unit 104 is further configured to determine whether the current operating time of the compressor reaches a fourth preset time or the current indoor heat exchanger pipe temperature of the air conditioning system is less than a preset first inner pipe temperature threshold. The specific functions and processing of the control unit 104 are further described in step S650. The fourth preset time is, for example, 5 minutes, and the first inner pipe temperature threshold is, for example, 10°C.

[0178] The control unit 104 is further configured to, if satisfied, adjust the fifth speed of the indoor fan to the set speed of the indoor fan, thereby determining the set speed of the indoor fan as the current speed of the indoor fan, and controlling the indoor fan to operate at the adjusted set speed; otherwise, it will maintain the current control mode. The specific functions and processing of this control unit 104 are further described in step S660.

[0179] Specifically, such as Figure 12 As shown, the control method for high-temperature cooling operation of a fixed-frequency air conditioning system further includes: in step 54, when the outdoor ambient temperature T... 外环 When the system is in high-temperature zone 4, after the indoor fan of the fixed-frequency air conditioning system is not turned on, the compressor will run for 30 seconds or the evaporator pipe temperature T will be reached. 蒸发器 If the temperature is below 4℃, the indoor fan will operate at its lowest speed. When the compressor has been running for 3 minutes or the evaporator pipe temperature reaches T... 蒸发器 If the temperature is below 6℃, the indoor fan speed should be increased by one level. When the compressor has been running for 5 minutes or the evaporator pipe temperature T... 蒸发器 If the temperature is below 10℃, the initial speed control of the indoor fan of the fixed-frequency air conditioning system will be discontinued, and the indoor fan will be controlled to operate according to the fan speed set by the user.

[0180] By controlling the indoor fan speed in the above manner, it can be ensured that the fixed-frequency air conditioning system will not experience high-pressure overshoot and high-pressure protection shutdown during the start-up phase in high-temperature zones due to the large pressure balance load of the fixed-frequency air conditioning system.

[0181] In the solution of this invention, the outdoor ambient temperature T of the fixed-frequency air conditioning system is detected after the fixed-frequency air conditioner is turned on for cooling. 外环 When the outdoor ambient temperature T 外环 A temperature >40℃ indicates that the fixed-frequency air conditioning system is in high-temperature cooling mode; further analysis is needed based on the outdoor ambient temperature T. 外环 The temperature is divided into high-temperature zones 1 to 4, based on the outdoor ambient temperature T. 外环 The initial fan speed of the indoor fan of the fixed-frequency air conditioning system is determined based on the different high-temperature zones it is located in, serving as the initial fan speed when the system starts up. This avoids excessively high indoor fan speed and evaporation pressure, which could lead to a heavy load on the fixed-frequency air conditioning system and cause pressure overshoot during startup. Furthermore, the compressor running time and the indoor evaporator pipe temperature T are considered. 蒸发器 Confirm that you are exiting control of the initial fan speed of the indoor fan to ensure that the indoor cooling output of the fixed-frequency air conditioning system guarantees the room's cooling effect.

[0182] The control unit 104 is further configured to, after stopping the initial speed adjustment of the indoor fan, and while controlling the indoor fan to operate at the adjusted current speed, correct the current opening degree of the throttling device of the air conditioning system based on the current outdoor heat exchanger pipe temperature of the air conditioning system and the current speed of the indoor fan, to obtain a new current opening degree of the throttling device; and control the throttling device to operate at the new current opening degree. The specific functions and processing of this control unit 104 are further described in step S140.

[0183] The present invention provides a control method for high-temperature cooling operation of a fixed-frequency air conditioning system. This method determines the indoor fan speed at startup based on the load of the fixed-frequency air conditioning system, and adjusts the flow rate of the fixed-frequency air conditioning system according to the outdoor condenser pipe temperature and the indoor fan speed. This reduces the high pressure of the fixed-frequency air conditioning system, preventing high-pressure protection shutdowns during cooling operation under high-temperature conditions, ensuring stable operation of the fixed-frequency air conditioning system under high-temperature conditions, and improving the comfort of using the fixed-frequency air conditioning system. Therefore, by defining different loads based on varying outdoor ambient temperatures and determining the initial indoor fan speed for each outdoor load, the problem of high-pressure protection due to excessive starting load in fixed-frequency air conditioning systems is solved. Specifically, this addresses the issue of pressure overshoot during startup in ultra-high outdoor temperatures causing high-temperature protection shutdown of the fixed-frequency air conditioning system, and also resolves the problem of the fixed-frequency air conditioning system failing to operate normally at high outdoor temperatures. Simultaneously, the indoor fan speed is determined based on compressor running time and indoor evaporator pipe temperature to ensure cooling output. Further adjustments are made based on outdoor condenser pipe temperature and indoor fan speed settings to the electronic expansion valve opening. By controlling the flow rate and indoor fan speed, stable cooling operation under high-temperature conditions is ensured, guaranteeing both cooling output and overall system reliability. This reduces the high pressure of the fixed-frequency air conditioning system under high-temperature cooling conditions, lowering energy consumption while maintaining effective high-temperature cooling.

[0184] In some embodiments, after stopping the initial speed adjustment of the indoor fan, the control unit 104, while controlling the indoor fan to operate at the adjusted current speed, corrects the current opening degree of the throttling device of the air conditioning system based on the current outdoor heat exchanger pipe temperature of the air conditioning system and the current speed of the indoor fan, to obtain a new current opening degree of the throttling device, including:

[0185] The control unit 104 is further configured to, after stopping the initial speed adjustment of the indoor fan, determine whether the current outdoor heat exchanger pipe temperature of the air conditioning system is greater than a preset high-temperature threshold for the outdoor pipe while controlling the indoor fan to operate at the adjusted current speed. The specific functions and processing of this control unit 104 are further described in step S710. The preset high-temperature threshold for the outdoor pipe is, for example, 50°C.

[0186] The control unit 104 is further configured to, if it is determined that the current outdoor heat exchanger pipe temperature of the air conditioning system is greater than a preset high-temperature threshold for the outdoor pipe, calculate a correction value for the current opening degree of the throttling device based on the current outdoor heat exchanger pipe temperature of the air conditioning system and the current speed of the indoor fan; of course, if it is determined that the current outdoor heat exchanger pipe temperature of the air conditioning system is not greater than the preset high-temperature threshold for the outdoor pipe, control the throttling device of the air conditioning system to maintain the current opening degree of the throttling device. The specific functions and processing of this control unit 104 are further described in step S720.

[0187] In some embodiments, the current speed of the indoor fan corresponds to any one of the preset first wind speed, preset second wind speed, preset third wind speed, and preset fourth wind speed. The first wind speed is such as low wind speed, the second wind speed is such as medium wind speed, the third wind speed is such as high wind speed, and the fourth wind speed is such as super strong wind speed. The speed corresponding to the preset first wind speed, the speed corresponding to the preset second wind speed, the speed corresponding to the preset third wind speed, and the speed corresponding to the preset fourth wind speed increase sequentially.

[0188] When the control unit 104 determines that the current outdoor heat exchanger pipe temperature of the air conditioning system is greater than a preset high-temperature threshold for the outdoor pipe, it calculates a correction value for the current opening degree of the throttling device based on the current outdoor heat exchanger pipe temperature of the air conditioning system and the current speed of the indoor fan, including:

[0189] The control unit 104 is further configured to determine the fan speed corresponding to the current rotation speed of the indoor fan, denoted as the current fan speed of the indoor fan. The specific functions and processing of the control unit 104 are further described in step S810.

[0190] The control unit 104 is further configured to, based on the correspondence between a set gear coefficient and a set gear, determine the set gear coefficient corresponding to the set gear that is the same as the current wind speed of the indoor fan in the correspondence as the current gear coefficient corresponding to the current wind speed of the indoor fan, and record it as the current gear coefficient of the indoor fan. The specific functions and processing of this control unit 104 are further described in step S820.

[0191] The control unit 104 is further configured to determine the difference between the current outdoor heat exchanger pipe temperature of the air conditioning system and a preset temperature threshold, and to determine the product of this difference and the current speed coefficient of the indoor fan as a correction value for the current opening degree of the throttling device. The specific functions and processing of the control unit 104 are further described in step S830.

[0192] Specifically, such as Figure 12 As shown, the control method for high-temperature cooling operation of a fixed-frequency air conditioning system further includes: in step 6, when the outdoor condenser tube temperature T... 外管 Too high, such as outdoor condenser tube temperature T 外管 When the temperature is >50℃, further calculations should be made based on the outdoor condenser tube temperature T. 外管 The opening of the electronic expansion valve is adjusted based on the temperature and indoor fan speed. Specifically, the opening of the electronic expansion valve is corrected by the following calculation: P' = P + (T 外管 -A)×B, to avoid excessive operating load on the fixed-frequency air conditioning system.

[0193] Wherein, P' is the corrected opening degree of the electronic expansion valve, and P is the current opening degree of the electronic expansion valve. A is a constant, and in the scheme of this invention, the preset value A is specifically 50°C; B is the indoor windshield coefficient, and in the scheme of this invention, the preset value B is specifically 4 for the super strong windshield coefficient, 3 for the high windshield coefficient, 2 for the medium windshield coefficient, and 1 for the low windshield coefficient.

[0194] The control unit 104 is further configured to determine the current opening degree of the throttling device and the sum of the correction value of the current opening degree of the throttling device as the new current opening degree of the throttling device, so as to correct the current opening degree of the throttling device of the air conditioning system. The specific functions and processing of the control unit 104 are further described in step S730.

[0195] Specifically, such as Figure 12 As shown, the control method for high-temperature cooling operation of a fixed-frequency air conditioning system further includes: Step 6, when the outdoor condenser tube temperature T... 外管 Too high, such as outdoor condenser tube temperature T 外管 When the temperature is >50℃, further calculations should be made based on the outdoor condenser tube temperature T. 外管 Adjust the temperature and indoor fan speed to control the opening of the electronic expansion valve and avoid excessive load on the fixed-frequency air conditioning system.

[0196] In the solution of this invention, based on the compressor running time and the indoor evaporator tube temperature T... 蒸发器 Confirm that the control of the initial fan speed of the indoor fan is deactivated to ensure that the indoor cooling capacity output of the fixed-frequency air conditioning system guarantees the room's cooling effect. Simultaneously, during the operation of the fixed-frequency air conditioning system, the outdoor condenser pipe temperature T should be considered. 外管The indoor fan damper adjusts the opening of the electronic expansion valve to prevent temperature fluctuations in the outdoor condenser pipe of the fixed-frequency air conditioning system from affecting the opening. 外管 Excessive pressure can cause the pressure in a fixed-frequency air conditioning system to rise. Reducing the operating load of the fixed-frequency air conditioning system can prevent it from triggering high-pressure protection and reduce its power consumption, thus ensuring both the comfort of using the fixed-frequency air conditioning system and achieving energy-saving operation.

[0197] In some embodiments, after stopping the initial speed adjustment of the indoor fan, the control unit 104, while controlling the indoor fan to operate at the adjusted current speed, further corrects the current opening degree of the throttling device of the air conditioning system based on the current outdoor heat exchanger pipe temperature of the air conditioning system and the current speed of the indoor fan to obtain a new current opening degree of the throttling device, and includes:

[0198] The control unit 104 is further configured to, when determining that the current outdoor heat exchanger pipe temperature of the air conditioning system is greater than a preset high-temperature threshold for the outer pipe, calculate a new correction value for the current opening degree of the throttling device based on the current outdoor heat exchanger pipe temperature of the air conditioning system and the current speed of the indoor fan, and control the throttling device to operate at the new current opening degree for a seventh preset time, and then return to: recalculate a new correction value for the current opening degree of the throttling device based on the current outdoor heat exchanger pipe temperature of the air conditioning system and the current speed of the indoor fan when the current outdoor heat exchanger pipe temperature of the air conditioning system is determined to be greater than the preset high-temperature threshold for the outer pipe. The specific functions and processing of this control unit 104 are also described in step S910.

[0199] The control unit 104 is further configured to cycle through this process until the latest obtained current opening degree of the throttling device reaches the set maximum opening degree, at which point it stops further correcting the latest obtained current opening degree of the throttling device and maintains the throttling device operating at the latest obtained current opening degree. The specific functions and processing of this control unit 104 are further described in step S920.

[0200] Specifically, such as Figure 12 As shown, the control method for high-temperature cooling operation of a fixed-frequency air conditioning system further includes: in step 6, the opening degree of the electronic expansion valve is updated every 30 seconds until the opening degree of the electronic expansion valve reaches the maximum opening degree value, such as 480P.

[0201] Through the above controls, the outdoor condenser tube temperature T is controlled. 外管The pressure will not rise too high, thus controlling the pressure of the fixed-frequency air conditioning system to prevent it from becoming too high. This makes the fixed-frequency air conditioning system more reliable and reduces energy consumption during high-temperature operation, allowing the fixed-frequency air conditioning system to operate stably in the high-temperature range and to operate more comfortably and energy-efficiently.

[0202] The solution of this invention involves detecting the outdoor ambient temperature T of the fixed-frequency air conditioning system after the fixed-frequency air conditioner is turned on for cooling. 外环 Outdoor condenser tube temperature T 外管 According to the outdoor ambient temperature T of the fixed-frequency air conditioning system 外环 Confirm whether the fixed-frequency air conditioning system is operating in the high-temperature cooling range; once the preset conditions are met (i.e., confirm that the fixed-frequency air conditioning system is operating in the high-temperature cooling range), adjust the outdoor ambient temperature T. 外环 Different initial fan speeds during startup of fixed-frequency air conditioning systems are used to prevent excessive starting loads that could lead to pressure overshoot and high-pressure protection shutdown. Furthermore, the indoor fan speed and outdoor condenser pipe temperature (T) are monitored. 外管 The value is used to correct the opening of the electronic expansion valve to prevent the outdoor condenser tube temperature T from rising. 外管 Excessive pressure in a fixed-frequency air conditioning system can cause it to shut down or further increase its load. This reduces the likelihood of the system shutting down due to high pressure protection, thus ensuring the comfort of the system while achieving energy-saving operation and extending its lifespan.

[0203] Since the processing and functions implemented by the device in this embodiment are basically the same as the embodiments, principles and examples of the aforementioned methods, any details not covered in the description of this embodiment can be found in the relevant descriptions in the aforementioned embodiments, and will not be repeated here.

[0204] By employing the technical solution of this invention, after the fixed-frequency air conditioning system starts cooling, when the outdoor ambient temperature is higher than the high-temperature threshold of the outer ring, the initial speed of the indoor fan is determined according to the high-temperature zone where the outdoor ambient temperature is located, and the initial speed of the indoor fan is adjusted according to the compressor running time or the indoor heat exchanger pipe temperature; and after the adjustment of the initial speed of the indoor fan is stopped, when the outdoor heat exchanger pipe temperature is higher than the high-temperature threshold of the outer pipe, the opening of the electronic expansion valve is corrected according to the outdoor heat exchanger pipe temperature and the indoor fan speed. By controlling the flow rate of the fixed-frequency air conditioning system and correcting the indoor fan speed, the stable cooling operation of the fixed-frequency air conditioning system under high-temperature conditions is ensured, guaranteeing the cooling output of the fixed-frequency air conditioning system while ensuring the reliable operation of the entire unit.

[0205] According to an embodiment of the present invention, a fixed-frequency air conditioning system corresponding to a control device for a fixed-frequency air conditioning system is also provided. This fixed-frequency air conditioning system may include: the control device for a fixed-frequency air conditioning system described above.

[0206] Since the processing and functions implemented by the fixed-frequency air conditioning system in this embodiment are basically the same as those of the aforementioned device embodiments, principles and examples, any details not covered in this embodiment can be found in the relevant descriptions in the aforementioned embodiments, and will not be repeated here.

[0207] By employing the technical solution of this invention, after the fixed-frequency air conditioning system starts cooling, when the outdoor ambient temperature is higher than the outer ring high-temperature threshold, the initial speed of the indoor fan is determined according to the high-temperature zone where the outdoor ambient temperature is located, and the initial speed of the indoor fan is adjusted according to the compressor running time or the indoor heat exchanger pipe temperature; and after the adjustment of the initial speed of the indoor fan is stopped, when the outdoor heat exchanger pipe temperature is higher than the outer pipe high-temperature threshold, the opening of the electronic expansion valve is corrected according to the outdoor heat exchanger pipe temperature and the indoor fan speed, which can reduce the high pressure of the fixed-frequency air conditioning system and avoid the fixed-frequency air conditioning system from experiencing high-pressure protection shutdown during cooling operation under high-temperature conditions.

[0208] According to an embodiment of the present invention, a storage medium corresponding to a control method for a fixed-frequency air conditioning system is also provided. The storage medium includes a stored program, wherein the program controls the device where the storage medium is located to execute the control method for the fixed-frequency air conditioning system described above when it is running.

[0209] Since the processing and functions implemented by the storage medium in this embodiment are basically the same as the embodiments, principles and examples of the aforementioned methods, any details not covered in this embodiment can be found in the relevant descriptions in the aforementioned embodiments, and will not be repeated here.

[0210] By employing the technical solution of this invention, after the fixed-frequency air conditioning system is turned on for cooling, when the outdoor ambient temperature is higher than the high-temperature threshold of the outer ring, the initial speed of the indoor fan is determined according to the high-temperature zone where the outdoor ambient temperature is located, and the initial speed of the indoor fan is adjusted according to the compressor running time or the indoor heat exchanger pipe temperature; and after the adjustment of the initial speed of the indoor fan is stopped, when the outdoor heat exchanger pipe temperature is higher than the high-temperature threshold of the outer pipe, the opening of the electronic expansion valve is corrected according to the outdoor heat exchanger pipe temperature and the indoor fan speed, thereby ensuring the stable operation of the fixed-frequency air conditioning system under high-temperature conditions and improving the comfort of using the fixed-frequency air conditioning system.

[0211] In summary, it is readily understood by those skilled in the art that, without conflict, the aforementioned advantageous methods can be freely combined and superimposed.

[0212] The above description is merely an embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A control method for a fixed-frequency air conditioning system, characterized in that, The fixed-frequency air conditioning system includes: a compressor, an outdoor heat exchanger, an indoor heat exchanger, and a throttling device, with an indoor fan installed at the indoor heat exchanger; the control method for the fixed-frequency air conditioning system includes: After the fixed-frequency air conditioning system is turned on for cooling, the outdoor ambient temperature of the environment where the air conditioning system is located is obtained and recorded as the current outdoor ambient temperature of the air conditioning system; the pipe temperature of the indoor heat exchanger of the air conditioning system is obtained and recorded as the current indoor heat exchanger pipe temperature of the air conditioning system; the pipe temperature of the outdoor heat exchanger of the air conditioning system is obtained and recorded as the current outdoor heat exchanger pipe temperature of the air conditioning system; and the cumulative running time of the compressor of the air conditioning system is obtained and recorded as the current running time of the compressor. Based on the current outdoor ambient temperature of the air conditioning system, determine the initial speed of the indoor fan of the air conditioning system; and control the indoor fan to operate at the determined initial speed. Based on the current outdoor ambient temperature of the air conditioning system, and in conjunction with the current running time of the compressor of the air conditioning system or the current indoor heat exchanger pipe temperature of the air conditioning system, the initial speed of the indoor fan is adjusted to obtain the current speed of the indoor fan; and the indoor fan is controlled to run at the adjusted current speed. After stopping the initial speed adjustment of the indoor fan, the current opening degree of the throttling device of the air conditioning system is corrected based on the current outdoor heat exchanger pipe temperature and the current speed of the indoor fan, resulting in a new current opening degree of the throttling device; and the throttling device is controlled to operate at the new current opening degree; the outdoor heat exchanger pipe temperature T 外管 >When the preset high temperature threshold for the external pipe is reached, the outdoor heat exchanger pipe temperature T is used as the reference. 外管 The temperature and indoor fan speed are used to correct the current opening of the throttling device; the current opening of the throttling device and the sum of the correction value of the current opening of the throttling device are determined as the new current opening of the throttling device.

2. The control method for a fixed-frequency air conditioning system according to claim 1, characterized in that, Determine the initial speed of the indoor fan of the air conditioning system based on the current outdoor ambient temperature, including: Determine whether the current outdoor ambient temperature of the air conditioning system is greater than the preset outer ring high temperature threshold; If it is determined that the current outdoor ambient temperature of the air conditioning system is greater than the preset outer ring high temperature threshold, then the current outdoor ambient temperature of the air conditioning system is determined to be within the preset high temperature range. Based on the correspondence between the set temperature range and the set initial speed, the set initial speed corresponding to the set temperature range that is the same as the range to which the current outdoor ambient temperature of the air conditioning system belongs within the preset high temperature range is determined as the initial speed of the indoor fan corresponding to the range to which the current outdoor ambient temperature of the air conditioning system belongs within the preset high temperature range.

3. The control method for a fixed-frequency air conditioning system according to claim 2, characterized in that, The preset high temperature range includes: a preset first high temperature range, a preset second high temperature range, a preset third high temperature range, and a preset fourth high temperature range; wherein, the lower limit of the preset first high temperature range is greater than the preset outer ring high temperature threshold, the lower limit of the preset second high temperature range is greater than the upper limit of the preset first high temperature range, the lower limit of the preset third high temperature range is greater than the upper limit of the preset second high temperature range, and the lower limit of the preset fourth high temperature range is greater than the upper limit of the preset third high temperature range. In the correspondence between the set temperature range and the set initial speed, the set initial speed includes: a preset first fan speed, a preset second fan speed, a preset third fan speed, and a preset fourth fan speed; the speed corresponding to the preset first fan speed, the speed corresponding to the preset second fan speed, the speed corresponding to the preset third fan speed, and the speed corresponding to the preset fourth fan speed increase sequentially. Based on the correspondence between a set temperature range and a set initial speed, the set initial speed corresponding to the set temperature range that is the same as the range within the preset high temperature range of the current outdoor ambient temperature of the air conditioning system is determined as the initial speed of the indoor fan corresponding to the range within the preset high temperature range of the current outdoor ambient temperature of the air conditioning system, including: If the current outdoor ambient temperature of the air conditioning system falls within a preset high temperature range, specifically within a preset first high temperature range, then the initial speed of the indoor fan is determined to be a preset third fan speed. If a set fan speed is received from the indoor fan, and the set fan speed is lower than the preset third fan speed, then the initial speed of the indoor fan is determined to be the set fan speed. If the current outdoor ambient temperature of the air conditioning system falls within a preset high temperature range, specifically within a preset second high temperature range, then the initial speed of the indoor fan is determined to be the preset second fan speed. If a set fan speed is received from the indoor fan, and the set fan speed is lower than the preset second fan speed, then the initial speed of the indoor fan is determined to be the set fan speed. If the current outdoor ambient temperature of the air conditioning system falls within the preset high temperature range and is in the preset third high temperature range, then the initial speed of the indoor fan is determined to be the preset first fan speed. If the current outdoor ambient temperature of the air conditioning system falls within the preset high temperature range and is within the preset fourth high temperature range, then the initial speed of the indoor fan is determined to be zero.

4. The control method for a fixed-frequency air conditioning system according to any one of claims 1 to 3, characterized in that, The preset high temperature range includes: a preset first high temperature range, a preset second high temperature range, a preset third high temperature range, and a preset fourth high temperature range; wherein, the lower limit of the preset first high temperature range is greater than the preset outer ring high temperature threshold, the lower limit of the preset second high temperature range is greater than the upper limit of the preset first high temperature range, the lower limit of the preset third high temperature range is greater than the upper limit of the preset second high temperature range, and the lower limit of the preset fourth high temperature range is greater than the upper limit of the preset third high temperature range. Based on the current outdoor ambient temperature of the air conditioning system, and in conjunction with the current operating time of the compressor or the current indoor heat exchanger pipe temperature, the initial speed of the indoor fan is adjusted to obtain the current speed of the indoor fan, including: If the current outdoor ambient temperature of the air conditioning system falls within a preset high temperature range and is within a preset first high temperature range, then, while controlling the indoor fan to run at the determined initial speed of the indoor fan, it is determined whether the current running time of the compressor reaches a first set time or the current indoor heat exchanger pipe temperature of the air conditioning system is less than a preset first inner pipe temperature threshold. If the conditions are met, the initial speed of the indoor fan is adjusted to the set speed of the indoor fan, so that the set speed of the indoor fan is determined as the current speed of the indoor fan, and the indoor fan is controlled to run according to the adjusted set speed of the indoor fan. And / or, If the current outdoor ambient temperature of the air conditioning system falls within a preset high temperature range and is within a preset second high temperature range, then, while controlling the indoor fan to operate at a determined initial speed, it is determined whether the current operating time of the compressor reaches a first set time or the current indoor heat exchanger pipe temperature of the air conditioning system is less than a preset second inner pipe temperature threshold; wherein, the preset second inner pipe temperature threshold is less than a preset first inner pipe temperature threshold. If the conditions are met, the initial speed of the indoor fan is increased by one level to obtain the first speed of the indoor fan, and the indoor fan is controlled to run at the first speed obtained by adjustment. Then, it is determined whether the current running time of the compressor reaches the second set time or the current indoor heat exchanger tube temperature of the air conditioning system is less than the preset first inner tube temperature threshold; wherein, the preset second set time is greater than the preset first set time; If satisfied, the first speed of the indoor fan is adjusted to the set speed of the indoor fan, so that the set speed of the indoor fan is determined as the current speed of the indoor fan, and the indoor fan is controlled to run according to the adjusted set speed of the indoor fan. And / or, If the current outdoor ambient temperature of the air conditioning system falls within the preset high temperature range and is within the preset third high temperature range, then, while controlling the indoor fan to run at the determined initial speed of the indoor fan, it is determined whether the current running time of the compressor reaches the first set time or the current indoor heat exchanger pipe temperature of the air conditioning system is less than the preset third inner pipe temperature threshold; wherein, the preset third inner pipe temperature threshold is less than the preset second inner pipe temperature threshold. If the conditions are met, the initial speed of the indoor fan is increased by one level to obtain the second speed of the indoor fan, and the indoor fan is controlled to run at the adjusted second speed. Then, it is determined whether the current running time of the compressor reaches the third set time or the current indoor heat exchanger tube temperature of the air conditioning system is less than the preset second inner tube temperature threshold; wherein, the preset third set time is greater than the preset first set time and less than the preset second set time; If the conditions are met, the first speed of the indoor fan is increased by one level to obtain the third speed of the indoor fan, and the indoor fan is controlled to run at the adjusted third speed. Then, it is determined whether the current running time of the compressor reaches the fourth preset time or the current indoor heat exchanger tube temperature of the air conditioning system is less than the preset first inner tube temperature threshold; wherein, the preset fourth preset time is greater than the preset second preset time; If satisfied, the second speed of the indoor fan is adjusted to the set speed of the indoor fan, so that the set speed of the indoor fan is determined as the current speed of the indoor fan, and the indoor fan is controlled to run according to the adjusted set speed of the indoor fan. And / or, If the current outdoor ambient temperature of the air conditioning system falls within the preset high temperature range and is within the preset fourth high temperature range, then, while controlling the indoor fan to operate at the determined initial speed of the indoor fan, it is determined whether the current operating time of the compressor reaches the sixth preset time or the current indoor heat exchanger pipe temperature of the air conditioning system is less than the preset fourth inner pipe temperature threshold; wherein, the preset sixth preset time is less than the preset first preset time, and the preset fourth inner pipe temperature threshold is less than the preset third inner pipe temperature threshold. If the conditions are met, then the initial speed of the indoor fan is increased by one level to obtain the fourth speed of the indoor fan, and the indoor fan is controlled to run at the adjusted fourth speed. Then, determine whether the current running time of the compressor reaches the third set time or the current indoor heat exchanger tube temperature of the air conditioning system is less than the preset third inner tube temperature threshold. If the conditions are met, the fourth speed of the indoor fan is increased by one level to obtain the fifth speed of the indoor fan, and the indoor fan is controlled to run at the fifth speed obtained by adjustment. Then, determine whether the current running time of the compressor reaches the fourth set time or the current indoor heat exchanger tube temperature of the air conditioning system is less than the preset first inner tube temperature threshold. If the conditions are met, the fifth speed of the indoor fan is adjusted to the set speed of the indoor fan, so that the set speed of the indoor fan is determined as the current speed of the indoor fan, and the indoor fan is controlled to operate according to the adjusted set speed.

5. The control method for a fixed-frequency air conditioning system according to any one of claims 1 to 3, characterized in that, After ceasing the initial speed adjustment of the indoor fan, the current opening degree of the throttling device of the air conditioning system is corrected based on the current outdoor heat exchanger pipe temperature and the current speed of the indoor fan, to obtain a new current opening degree of the throttling device, including: After stopping the initial speed adjustment of the indoor fan, determine whether the current outdoor heat exchanger pipe temperature of the air conditioning system is greater than the preset outdoor pipe high temperature threshold. If it is determined that the current outdoor heat exchanger tube temperature of the air conditioning system is greater than the preset outdoor tube high temperature threshold, then the correction value of the current opening degree of the throttling device is calculated based on the current outdoor heat exchanger tube temperature of the air conditioning system and the current speed of the indoor fan. The current opening degree of the throttling device and the sum of the correction value of the current opening degree of the throttling device are determined as the new current opening degree of the throttling device, so as to realize the correction of the current opening degree of the throttling device of the air conditioning system.

6. The control method for a fixed-frequency air conditioning system according to claim 4, characterized in that, After ceasing the initial speed adjustment of the indoor fan, the current opening degree of the throttling device of the air conditioning system is corrected based on the current outdoor heat exchanger pipe temperature and the current speed of the indoor fan, to obtain a new current opening degree of the throttling device, including: After stopping the initial speed adjustment of the indoor fan, determine whether the current outdoor heat exchanger pipe temperature of the air conditioning system is greater than the preset outdoor pipe high temperature threshold. If it is determined that the current outdoor heat exchanger tube temperature of the air conditioning system is greater than the preset outdoor tube high temperature threshold, then the correction value of the current opening degree of the throttling device is calculated based on the current outdoor heat exchanger tube temperature of the air conditioning system and the current speed of the indoor fan. The current opening degree of the throttling device and the sum of the correction value of the current opening degree of the throttling device are determined as the new current opening degree of the throttling device, so as to realize the correction of the current opening degree of the throttling device of the air conditioning system.

7. The control method for a fixed-frequency air conditioning system according to claim 5, characterized in that, The current speed of the indoor fan corresponds to any one of the preset first wind speed, preset second wind speed, preset third wind speed, and preset fourth wind speed; the speed corresponding to the preset first wind speed, the speed corresponding to the preset second wind speed, the speed corresponding to the preset third wind speed, and the speed corresponding to the preset fourth wind speed increase sequentially. Based on the current outdoor heat exchanger pipe temperature of the air conditioning system and the current speed of the indoor fan, the correction value for the current opening degree of the throttling device is calculated, including: Determine the fan speed corresponding to the current speed of the indoor fan, and record it as the current fan speed of the indoor fan; Based on the correspondence between the set gear coefficient and the set gear, the set gear coefficient corresponding to the set gear that is the same as the current wind speed of the indoor fan in the correspondence is determined as the current gear coefficient corresponding to the current wind speed of the indoor fan, and is recorded as the current gear coefficient of the indoor fan. The difference between the current outdoor heat exchanger pipe temperature of the air conditioning system and the preset temperature threshold is determined, and the product of this difference and the current speed coefficient of the indoor fan is determined as the correction value of the current opening degree of the throttling device.

8. The control method for a fixed-frequency air conditioning system according to claim 6, characterized in that, The current speed of the indoor fan corresponds to any one of the preset first wind speed, preset second wind speed, preset third wind speed, and preset fourth wind speed; the speed corresponding to the preset first wind speed, the speed corresponding to the preset second wind speed, the speed corresponding to the preset third wind speed, and the speed corresponding to the preset fourth wind speed increase sequentially. Based on the current outdoor heat exchanger pipe temperature of the air conditioning system and the current speed of the indoor fan, the correction value for the current opening degree of the throttling device is calculated, including: Determine the fan speed corresponding to the current speed of the indoor fan, and record it as the current fan speed of the indoor fan; Based on the correspondence between the set gear coefficient and the set gear, the set gear coefficient corresponding to the set gear that is the same as the current wind speed of the indoor fan in the correspondence is determined as the current gear coefficient corresponding to the current wind speed of the indoor fan, and is recorded as the current gear coefficient of the indoor fan. The difference between the current outdoor heat exchanger pipe temperature of the air conditioning system and the preset temperature threshold is determined, and the product of this difference and the current speed coefficient of the indoor fan is determined as the correction value of the current opening degree of the throttling device.

9. The control method for a fixed-frequency air conditioning system according to claim 5, characterized in that, After stopping the initial speed adjustment of the indoor fan, the current opening degree of the throttling device of the air conditioning system is corrected based on the current outdoor heat exchanger pipe temperature and the current speed of the indoor fan, to obtain a new current opening degree of the throttling device, which also includes: Based on the current outdoor heat exchanger pipe temperature of the air conditioning system and the current speed of the indoor fan, a new correction value for the current opening of the throttling device is calculated. After the throttling device is controlled to run at the new current opening for a seventh set time, it returns to the previous state to recalculate the new correction value for the current opening of the throttling device based on the current outdoor heat exchanger pipe temperature of the air conditioning system and the current speed of the indoor fan. This process is repeated until the latest obtained current opening degree of the throttling device reaches the set maximum opening degree. At this point, the correction of the latest obtained current opening degree of the throttling device is stopped, and the throttling device is kept running at the latest obtained current opening degree.

10. The control method for a fixed-frequency air conditioning system according to claim 6, characterized in that, After stopping the initial speed adjustment of the indoor fan, the current opening degree of the throttling device of the air conditioning system is corrected based on the current outdoor heat exchanger pipe temperature and the current speed of the indoor fan, to obtain a new current opening degree of the throttling device, which also includes: Based on the current outdoor heat exchanger pipe temperature of the air conditioning system and the current speed of the indoor fan, a new correction value for the current opening of the throttling device is calculated. After the throttling device is controlled to run at the new current opening for a seventh set time, it returns to the previous state to recalculate the new correction value for the current opening of the throttling device based on the current outdoor heat exchanger pipe temperature of the air conditioning system and the current speed of the indoor fan. This process is repeated until the latest obtained current opening degree of the throttling device reaches the set maximum opening degree. At this point, the correction of the latest obtained current opening degree of the throttling device is stopped, and the throttling device is kept running at the latest obtained current opening degree.

11. A control device for a fixed-frequency air conditioning system that uses the control method for a fixed-frequency air conditioning system as described in any one of claims 1 to 10 to achieve control of the fixed-frequency air conditioning system, characterized in that, The fixed-frequency air conditioning system includes: a compressor, an outdoor heat exchanger, an indoor heat exchanger, and a throttling device, with an indoor fan installed at the indoor heat exchanger; the control device for the fixed-frequency air conditioning system includes: The acquisition unit is configured to, after the fixed-frequency air conditioning system is turned on for cooling, acquire the outdoor ambient temperature of the environment where the air conditioning system is located, and record it as the current outdoor ambient temperature of the air conditioning system; acquire the pipe temperature of the indoor heat exchanger of the air conditioning system, and record it as the current indoor heat exchanger pipe temperature of the air conditioning system; acquire the pipe temperature of the outdoor heat exchanger of the air conditioning system, and record it as the current outdoor heat exchanger pipe temperature of the air conditioning system; and acquire the cumulative running time of the compressor of the air conditioning system, and record it as the current running time of the compressor. The control unit is configured to determine the initial speed of the indoor fan of the air conditioning system based on the current outdoor ambient temperature of the air conditioning system; and control the indoor fan to operate at the determined initial speed. The control unit is further configured to adjust the initial speed of the indoor fan based on the current outdoor ambient temperature of the air conditioning system, combined with the current running time of the compressor of the air conditioning system or the current indoor heat exchanger tube temperature of the air conditioning system, to obtain the current speed of the indoor fan; and control the indoor fan to run at the adjusted current speed of the indoor fan. The control unit is further configured to, after stopping the initial speed adjustment of the indoor fan, correct the current opening degree of the throttling device of the air conditioning system based on the current outdoor heat exchanger pipe temperature of the air conditioning system and the current speed of the indoor fan, to obtain a new current opening degree of the throttling device; and control the throttling device to operate at the new current opening degree of the throttling device.

12. A fixed-frequency air conditioning system, characterized in that, include: The control device for a fixed-frequency air conditioning system as described in claim 11.

13. A storage medium, characterized in that, The storage medium includes a stored program, wherein, when the program is executed, it controls the device containing the storage medium to perform the control method of the fixed-frequency air conditioning system according to any one of claims 1 to 10.

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