CN107120809B

CN107120809B - control method and device of air conditioning system and air conditioning system

Info

Publication number: CN107120809B
Application number: CN201710443401.8A
Authority: CN
Inventors: 李立民; 滕天凤; 冯涛; 金孟孟; 曹朋; 黄文豪; 王楚; 朱世强
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2017-06-13
Filing date: 2017-06-13
Publication date: 2019-12-17
Anticipated expiration: 2037-06-13
Also published as: CN107120809A

Abstract

The invention discloses a control method and a control device of an air conditioning system and the air conditioning system, wherein the method comprises the following steps: acquiring the indoor environment temperature and the user set temperature of the air conditioning system; determining a difference between the indoor ambient temperature and the user set temperature; and controlling the saturation temperature corresponding to the evaporation pressure or the condensation pressure of the air conditioning system according to the operation mode of the air conditioning system and the difference value. The scheme of the invention can overcome the defects of poor energy-saving effect, inconvenient use, poor user experience and the like in the prior art, and realizes the beneficial effects of good energy-saving effect, convenient use and good user experience.

Description

control method and device of air conditioning system and air conditioning system

Technical Field

The invention belongs to the technical field of air conditioners, and particularly relates to a control method and a control device for an air conditioning system and the air conditioning system, in particular to a control method for an energy-saving operation multi-split air conditioning system, a device corresponding to the method and the multi-split air conditioning system with the device.

background

the multi-split central air conditioner is a type of household central air conditioner, commonly called as 'one driving more', and refers to a primary refrigerant air conditioning system in which one outdoor unit is connected with two or more indoor units through a pipe, the outdoor side adopts an air cooling heat exchange mode, and the indoor side adopts a direct evaporation heat exchange mode.

When the existing multi-split air conditioning system operates in a cooling operation and a heating operation, in order to achieve a certain cooling or heating effect, a constant evaporation pressure or condensation pressure can be controlled, but when the indoor temperature is continuously close to the temperature set by a customer, the evaporation pressure or the condensation pressure cannot be changed, so that the output of a compressor is larger, and the energy-saving effect of the whole system is not ideal.

in the prior art, the defects of poor energy-saving effect, inconvenient use, poor user experience and the like exist.

disclosure of Invention

The present invention aims to solve the above-mentioned drawbacks, and provide a method and an apparatus for controlling an air conditioning system, and an air conditioning system, so as to solve the problem in the prior art that when an indoor temperature of a multi-split air conditioning system is continuously close to a temperature set by a user, a heat exchange pressure (e.g., an evaporation pressure or a condensation pressure) is not changed, which results in a poor energy saving effect of an output of a compressor, and achieve an effect of improving energy saving.

The invention provides a control method of an air conditioning system, which comprises the following steps: acquiring the indoor environment temperature and the user set temperature of the air conditioning system; determining a difference between the indoor ambient temperature and the user set temperature; and controlling the saturation temperature corresponding to the evaporation pressure or the condensation pressure of the air conditioning system according to the operation mode of the air conditioning system and the difference value.

optionally, the operating mode includes: a cooling mode or a heating mode; the controlling of the saturation temperature corresponding to the evaporation pressure or the condensation pressure of the air conditioning system comprises: when the operation mode is the refrigeration mode, controlling the saturation temperature corresponding to the evaporation pressure of the air conditioning system; and when the operation mode is the heating mode, controlling the saturation temperature corresponding to the condensation pressure of the air conditioning system.

optionally, the method further comprises: acquiring the outdoor ambient temperature of the air conditioning system; the control the saturation temperature that evaporation pressure or condensing pressure of air conditioning system correspond still includes: when the operation mode is a refrigeration mode, controlling the saturation temperature corresponding to the evaporation pressure of the air conditioning system according to the outdoor environment temperature and the difference value; and when the operation mode is a heating mode, controlling the protection temperature corresponding to the condensing pressure of the air conditioning system according to the difference.

Optionally, the controlling of the saturation temperature corresponding to the evaporation pressure or the condensation pressure of the air conditioning system includes: when the outdoor environment temperature is greater than or equal to the upper limit of a first set threshold range or less than or equal to the lower limit of the first set threshold range, if the difference is greater than the upper limit of a second set threshold range, controlling the saturation temperature corresponding to the evaporation pressure to be a first set value; or when the outdoor environment temperature is greater than or equal to the upper limit of the first set threshold range, if the difference is equal to the upper limit of the second set threshold range, controlling the saturation temperature corresponding to the evaporation pressure to increase, and enabling the saturation temperature corresponding to the evaporation pressure not to exceed a second set value; or when the outdoor environment temperature is less than or equal to the lower limit of the first set threshold range, if the difference is greater than or equal to the lower limit of a second set threshold range and less than or equal to the upper limit of the second set threshold range, controlling the saturation temperature corresponding to the evaporation pressure to be a third set value; or when the outdoor environment temperature is greater than the lower limit of the first set threshold range and less than the upper limit of the first set threshold range, maintaining the previous control of the saturation temperature corresponding to the evaporation pressure.

Optionally, controlling the saturation temperature increase corresponding to the evaporation pressure comprises: controlling the saturation temperature corresponding to the evaporation pressure to increase by a first set temperature; and if the difference is reduced to be larger than or equal to a second set threshold range lower limit and smaller than or equal to a second set threshold range upper limit, continuing to control the saturation temperature corresponding to the evaporation pressure to increase the first set temperature.

Optionally, controlling the saturation temperature corresponding to the evaporation pressure to increase by a first set temperature includes: controlling the saturation temperature interval corresponding to the evaporation pressure to increase the first set temperature; and/or controlling the saturation temperature corresponding to the evaporation pressure to increase the first set temperature in a delayed manner.

Optionally, wherein controlling the saturation temperature corresponding to the evaporation pressure to be a first set value and/or controlling the saturation temperature corresponding to the evaporation pressure to be a third set value specifically includes: adjusting at least one of the frequency of a compressor of the air conditioning system, the rotating speed of an outdoor fan and the opening degree of a throttling element in a matching manner to enable the saturation temperature corresponding to the evaporation pressure to be the first set value and/or enable the saturation temperature corresponding to the evaporation pressure to be the third set value; and/or controlling the saturation temperature increase corresponding to the evaporation pressure, specifically comprising: reducing the frequency of a compressor of the air conditioning system in an adaptive manner, and adjusting at least one of the rotating speed of an outdoor fan and the opening degree of a throttling element of the air conditioning system in an adaptive manner, so that the saturation temperature corresponding to the evaporation pressure is increased; and/or, enabling the saturation temperature corresponding to the evaporation pressure not to exceed a second set value, specifically comprising: and when the saturation temperature corresponding to the evaporation pressure reaches the second set value, maintaining the state that the saturation temperature corresponding to the evaporation pressure reaches the second set value by adaptively adjusting at least one of the frequency of a compressor of the air conditioning system and the rotating speed of an outdoor fan.

optionally, controlling a saturation temperature corresponding to an evaporation pressure of the air conditioning system, further includes: after the saturation temperature corresponding to the evaporation pressure is controlled to be increased, and/or after the saturation temperature corresponding to the evaporation pressure is controlled to be a third set value, if the difference value is recovered to be larger than the upper limit of the second set threshold range, the saturation temperature corresponding to the evaporation pressure is controlled to be recovered to the first set value; wherein the first set threshold range includes: 15-20 ℃; and/or, the second set threshold range includes: 0 to 3 ℃.

Optionally, the controlling of the saturation temperature corresponding to the condensing pressure of the air conditioning system in the controlling of the saturation temperature corresponding to the evaporating pressure or the condensing pressure of the air conditioning system includes: if the difference is smaller than the lower limit of the third set threshold range, controlling the saturation temperature corresponding to the condensing pressure of the air conditioning system to be a fourth set value; or if the difference is equal to the lower limit of the third set threshold range, controlling the saturation temperature corresponding to the condensing pressure to be reduced, and enabling the saturation temperature corresponding to the condensing pressure not to be lower than a fifth set value.

optionally, controlling the saturation temperature reduction corresponding to the condensing pressure comprises: controlling the saturation temperature corresponding to the condensing pressure to reduce a second set temperature; and if the difference is reduced to be larger than or equal to the lower limit of the third set threshold range and smaller than or equal to the upper limit of the third set threshold range, continuing to control the saturation temperature corresponding to the condensation pressure to reduce the second set temperature.

Optionally, controlling the saturation temperature corresponding to the condensing pressure to decrease the second set temperature includes: reducing the second set temperature when controlling the saturation temperature interval corresponding to the condensing pressure; and/or controlling the saturation temperature corresponding to the condensing pressure to reduce the second set temperature in a delayed manner.

optionally, wherein controlling the saturation temperature corresponding to the condensing pressure of the air conditioning system to be a fourth set value specifically includes: adjusting at least one of the frequency of a compressor of the air conditioning system, the rotating speed of an outdoor fan and the opening of a throttling element in an adaptive manner to enable the saturation temperature corresponding to the condensing pressure to be a fourth set value; and/or controlling the saturation temperature reduction corresponding to the condensation pressure, and specifically comprising: the saturation temperature corresponding to the condensation pressure is reduced by adaptively increasing the frequency of a compressor of the air-conditioning system and adaptively adjusting at least one of the rotating speed of an outdoor fan and the opening degree of a throttling element of the air-conditioning system; and/or, the saturation temperature corresponding to the condensation pressure is not lower than a fifth set value, and the method specifically comprises the following steps: and when the saturation temperature corresponding to the condensing pressure reaches the fifth set value, maintaining the state that the saturation temperature corresponding to the condensing pressure reaches the fifth set value by adaptively adjusting at least one of the frequency of a compressor of the air conditioning system and the rotating speed of an outdoor fan.

Optionally, controlling a saturation temperature corresponding to a condensing pressure of the air conditioning system further includes: after the saturation temperature corresponding to the condensation pressure is controlled to be reduced, if the difference value is recovered to be smaller than the lower limit of the third set threshold range, the saturation temperature corresponding to the condensation pressure is controlled to be recovered to the fourth set value; wherein the third set threshold range includes: -2 ℃ to 0.

In accordance with the above method, another aspect of the present invention provides a control apparatus for an air conditioning system, comprising: the system comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring the indoor environment temperature and the user set temperature of the air conditioning system; a determination unit for determining a difference between the indoor ambient temperature and the user set temperature; and the control unit is used for controlling the saturation temperature corresponding to the evaporation pressure or the condensation pressure of the air conditioning system according to the operation mode of the air conditioning system and the difference value.

Optionally, the operating mode includes: a cooling mode or a heating mode; the control unit controls the saturation temperature corresponding to the evaporation pressure or the condensation pressure of the air conditioning system, and the control unit specifically comprises: when the operation mode is the refrigeration mode, controlling the saturation temperature corresponding to the evaporation pressure of the air conditioning system; and when the operation mode is the heating mode, controlling the saturation temperature corresponding to the condensation pressure of the air conditioning system.

Optionally, the method further comprises: the acquisition unit is further used for acquiring the outdoor ambient temperature of the air conditioning system; the control unit controls the saturation temperature corresponding to the evaporation pressure or the condensation pressure of the air conditioning system, and specifically, the control unit further comprises: when the operation mode is a refrigeration mode, controlling the saturation temperature corresponding to the evaporation pressure of the air conditioning system according to the outdoor environment temperature and the difference value; and when the operation mode is a heating mode, controlling the protection temperature corresponding to the condensing pressure of the air conditioning system according to the difference.

optionally, the controlling unit controls a saturation temperature corresponding to the evaporation pressure of the air conditioning system in a saturation temperature corresponding to the evaporation pressure or the condensation pressure of the air conditioning system, and specifically includes: when the outdoor environment temperature is greater than or equal to the upper limit of a first set threshold range or less than or equal to the lower limit of the first set threshold range, if the difference is greater than the upper limit of a second set threshold range, controlling the saturation temperature corresponding to the evaporation pressure to be a first set value; or when the outdoor environment temperature is greater than or equal to the upper limit of the first set threshold range, if the difference is equal to the upper limit of the second set threshold range, controlling the saturation temperature corresponding to the evaporation pressure to increase, and enabling the saturation temperature corresponding to the evaporation pressure not to exceed a second set value; or when the outdoor environment temperature is less than or equal to the lower limit of the first set threshold range, if the difference is greater than or equal to the lower limit of a second set threshold range and less than or equal to the upper limit of the second set threshold range, controlling the saturation temperature corresponding to the evaporation pressure to be a third set value; or when the outdoor environment temperature is greater than the lower limit of the first set threshold range and less than the upper limit of the first set threshold range, maintaining the previous control of the saturation temperature corresponding to the evaporation pressure.

Optionally, the controlling unit controls the saturation temperature increase corresponding to the evaporation pressure, and specifically includes: controlling the saturation temperature corresponding to the evaporation pressure to increase by a first set temperature; and if the difference is reduced to be larger than or equal to a second set threshold range lower limit and smaller than or equal to a second set threshold range upper limit, continuing to control the saturation temperature corresponding to the evaporation pressure to increase the first set temperature.

Optionally, the controlling unit controls the saturation temperature corresponding to the evaporation pressure to increase by a first set temperature, and specifically includes: controlling the saturation temperature interval corresponding to the evaporation pressure to increase the first set temperature; and/or controlling the saturation temperature corresponding to the evaporation pressure to increase the first set temperature in a delayed manner.

optionally, the controlling unit controls the saturation temperature corresponding to the evaporation pressure to be a first set value and/or controls the saturation temperature corresponding to the evaporation pressure to be a third set value, and specifically includes: adjusting at least one of the frequency of a compressor of the air conditioning system, the rotating speed of an outdoor fan and the opening degree of a throttling element in a matching manner to enable the saturation temperature corresponding to the evaporation pressure to be the first set value and/or enable the saturation temperature corresponding to the evaporation pressure to be the third set value; and/or the control unit controls the saturation temperature increase corresponding to the evaporation pressure, and specifically comprises: reducing the frequency of a compressor of the air conditioning system in an adaptive manner, and adjusting at least one of the rotating speed of an outdoor fan and the opening degree of a throttling element of the air conditioning system in an adaptive manner, so that the saturation temperature corresponding to the evaporation pressure is increased; and/or the control unit enables the saturation temperature corresponding to the evaporation pressure not to exceed a second set value, and specifically comprises: and when the saturation temperature corresponding to the evaporation pressure reaches the second set value, maintaining the state that the saturation temperature corresponding to the evaporation pressure reaches the second set value by adaptively adjusting at least one of the frequency of a compressor of the air conditioning system and the rotating speed of an outdoor fan.

Optionally, the control unit controls a saturation temperature corresponding to an evaporation pressure of the air conditioning system, and specifically further includes: after the saturation temperature corresponding to the evaporation pressure is controlled to be increased, and/or after the saturation temperature corresponding to the evaporation pressure is controlled to be a third set value, if the difference value is recovered to be larger than the upper limit of the second set threshold range, the saturation temperature corresponding to the evaporation pressure is controlled to be recovered to the first set value; wherein the first set threshold range includes: 15-20 ℃; and/or, the second set threshold range includes: 0 to 3 ℃.

optionally, the controlling unit controls a saturation temperature corresponding to a condensing pressure of the air conditioning system in a saturation temperature corresponding to an evaporating pressure or a condensing pressure of the air conditioning system, and specifically includes: if the difference is smaller than the lower limit of the third set threshold range, controlling the saturation temperature corresponding to the condensing pressure of the air conditioning system to be a fourth set value; or if the difference is equal to the lower limit of the third set threshold range, controlling the saturation temperature corresponding to the condensing pressure to be reduced, and enabling the saturation temperature corresponding to the condensing pressure not to be lower than a fifth set value.

optionally, the controlling unit controls the saturation temperature corresponding to the condensing pressure to decrease, specifically including: controlling the saturation temperature corresponding to the condensing pressure to reduce a second set temperature; and if the difference is reduced to be larger than or equal to the lower limit of the third set threshold range and smaller than or equal to the upper limit of the third set threshold range, continuing to control the saturation temperature corresponding to the condensation pressure to reduce the second set temperature.

Optionally, the controlling unit controls the saturation temperature corresponding to the condensing pressure to decrease a second set temperature, specifically including: reducing the second set temperature when controlling the saturation temperature interval corresponding to the condensing pressure; and/or controlling the saturation temperature corresponding to the condensing pressure to reduce the second set temperature in a delayed manner.

optionally, the controlling unit controls a saturation temperature corresponding to the condensing pressure of the air conditioning system to be a fourth set value, and specifically includes: adjusting at least one of the frequency of a compressor of the air conditioning system, the rotating speed of an outdoor fan and the opening of a throttling element in an adaptive manner to enable the saturation temperature corresponding to the condensing pressure to be a fourth set value; and/or the control unit controls the saturation temperature corresponding to the condensation pressure to decrease, and specifically comprises: the saturation temperature corresponding to the condensation pressure is reduced by adaptively increasing the frequency of a compressor of the air-conditioning system and adaptively adjusting at least one of the rotating speed of an outdoor fan and the opening degree of a throttling element of the air-conditioning system; and/or, the control unit enables the saturation temperature corresponding to the condensation pressure not to be lower than a fifth set value, and specifically comprises: and when the saturation temperature corresponding to the condensing pressure reaches the fifth set value, maintaining the state that the saturation temperature corresponding to the condensing pressure reaches the fifth set value by adaptively adjusting at least one of the frequency of a compressor of the air conditioning system and the rotating speed of an outdoor fan.

optionally, the control unit controls a saturation temperature corresponding to a condensing pressure of the air conditioning system, and specifically further includes: after the saturation temperature corresponding to the condensation pressure is controlled to be reduced, if the difference value is recovered to be smaller than the lower limit of the third set threshold range, the saturation temperature corresponding to the condensation pressure is controlled to be recovered to the fourth set value; wherein the third set threshold range includes: -2 ℃ to 0.

in accordance with another aspect of the present invention, there is provided an air conditioning system including: the control device of the air conditioning system described above.

according to the scheme of the invention, the difference between the indoor environment temperature and the temperature set by the customer is monitored in real time, and the change of the evaporation pressure or the condensation pressure is controlled, so that the output of the compressor achieves the optimal energy-saving effect.

Further, according to the scheme of the invention, different evaporation pressures and condensation pressures are controlled by determining the outdoor environment temperature, the indoor environment temperature and the set temperature of a user, and the output of the compressor and the output of the fan are controlled to achieve the optimal effect on the premise of ensuring the indoor refrigeration or heating effect, so that the system achieves the optimal effect.

furthermore, according to the scheme of the invention, different evaporating pressures and condensing pressures are controlled according to the difference between the indoor environment temperature and the user set temperature under different outdoor environment temperatures, so that the system can achieve the optimal energy saving performance on the premise of better ensuring the indoor refrigeration or heating effect, and the control precision is higher.

Therefore, according to the scheme of the invention, the output of the compressor achieves the best energy-saving effect by controlling the change of the heat exchange pressure (such as the evaporation pressure during refrigeration, the condensation pressure during heating and the like) according to the difference between the indoor environment temperature and the temperature set by the user, and the problem that the energy-saving effect of the multi-split air-conditioning system is poor due to the fact that the heat exchange pressure (such as the evaporation pressure or the condensation pressure) cannot be changed when the indoor temperature of the multi-split air-conditioning system is continuously close to the temperature set by the user in the prior art is solved, so that the defects of poor energy-saving effect, inconvenience in use and poor user experience in the prior art are overcome, and the beneficial effects of good energy-saving effect, convenience in use and good user experience are realized.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

the technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.

drawings

FIG. 1 is a flowchart illustrating an embodiment of a control method of an air conditioning system according to the present invention;

FIG. 2 is a schematic flow chart illustrating an embodiment of controlling the saturation temperature increase corresponding to the evaporating pressure in the method of the present invention;

FIG. 3 is a schematic flow chart illustrating one embodiment of controlling the saturation temperature reduction corresponding to the condensing pressure in the method of the present invention;

FIG. 4 is a schematic structural diagram of a control device of an air conditioning system according to an embodiment of the present invention;

FIG. 5 is a schematic time temperature curve of an embodiment of the air conditioning system of the present invention during cooling operation;

fig. 6 is a schematic time-temperature curve diagram of an embodiment of the air conditioning system of the present invention during heating operation.

The reference numbers in the embodiments of the present invention are as follows, in combination with the accompanying drawings:

102-an obtaining unit; 104-a determination unit; 106-a control unit; 108-setting unit.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

according to an embodiment of the present invention, a control method of an air conditioning system (e.g., a control method of an energy-saving operation multi-split air conditioning system) is provided, as shown in fig. 1, which is a schematic flowchart of an embodiment of the method of the present invention. The control method of the air conditioning system may include:

In step S110, an indoor ambient temperature and a user-set temperature of the air conditioning system are obtained.

at step S120, a difference between the indoor ambient temperature and the user-set temperature is determined.

In step S130, a saturation temperature corresponding to an evaporation pressure or a condensation pressure of the air conditioning system is controlled according to the operation mode of the air conditioning system and the difference.

Therefore, the change of the saturation temperature corresponding to the evaporation pressure or the condensation pressure is controlled through the operation mode of the air conditioning system and the difference between the indoor environment temperature and the set temperature of the client, and the energy-saving effect and the user experience are favorably improved.

In an alternative embodiment, in step S130, the operation mode may include: a cooling mode or a heating mode.

Optionally, the step S130 of controlling a saturation temperature corresponding to an evaporation pressure or a condensation pressure of the air conditioning system may include: when the operation mode is the refrigeration mode, controlling the saturation temperature corresponding to the evaporation pressure of the air conditioning system; and when the operation mode is the heating mode, controlling the saturation temperature corresponding to the condensation pressure of the air conditioning system.

therefore, the saturation temperature corresponding to the evaporation pressure is controlled during refrigeration, and the saturation temperature corresponding to the condensation pressure is controlled during heating, so that the control mode is simple and convenient, and the reliability is high.

in an alternative embodiment, the method may further include: and acquiring the outdoor ambient temperature of the air conditioning system.

optionally, the step S130 of controlling a saturation temperature corresponding to an evaporation pressure or a condensation pressure of the air conditioning system may further include: and when the operation mode is a refrigeration mode, controlling the saturation temperature corresponding to the evaporation pressure of the air conditioning system according to the outdoor environment temperature and the difference value.

For example: during cooling operation, according to a range of outdoor environment temperature (for example, a range of the outdoor environment temperature in the first set threshold range) and/or a range of the difference (for example, a range of the difference in the second set threshold range), controlling a saturation temperature corresponding to an evaporation pressure (for example, an evaporation pressure of an evaporator during cooling operation) of the air conditioning system, so as to realize cooling energy-saving control on the air conditioner (see the example shown in fig. 5); and/or controlling the saturation temperature corresponding to the condensing pressure of the air conditioning system (for example, the condensing pressure of the condenser during the heating operation) according to the range of the difference (for example, according to the range of the difference in the third set threshold range) during the heating operation, so as to realize the heating energy-saving control of the air conditioner (see the example shown in fig. 6).

the evaporation pressure is the maximum pressure at which the refrigerant changes from a liquid state to a gas state at a constant temperature. The condensing pressure is the minimum pressure at which the refrigerant changes from a gaseous state to a liquid state at a constant temperature. The saturation temperature is a temperature at which the liquid and the vapor are in a dynamic equilibrium state, i.e., a saturated state.

for example: different evaporation pressures are controlled by determining the outdoor environment temperature, the indoor environment temperature and the set temperature of a user, and the output of the compressor and the output of the fan are controlled to achieve the optimal effect on the premise of ensuring the indoor refrigeration effect, so that the system achieves the optimal effect.

Optionally, the step S130 of controlling a saturation temperature corresponding to an evaporation pressure or a condensation pressure of the air conditioning system may further include: and when the operation mode is a heating mode, controlling the protection temperature corresponding to the condensing pressure of the air conditioning system according to the difference.

thus, the evaporation pressure is changed during refrigeration by controlling the change of the evaporation pressure according to the difference between the indoor environment temperature and the temperature set by the customer and combining the outdoor environment temperature; the change of the condensing pressure is controlled according to the difference between the indoor environment temperature and the temperature set by the client, so that the condensing pressure is changed during heating, and the system achieves the best energy saving performance (for example, the output of the compressor achieves the best energy saving effect) on the premise of ensuring the indoor refrigerating or heating effect, so that the refrigerating or heating control is more convenient, and the user experience is good.

In an alternative embodiment, the method may further include: setting a first set threshold range, a second set threshold range and a third set threshold range.

For example: the first set threshold range is 15-20 ℃, the second set threshold range is 0-3 ℃, and the third set threshold range is-2-0.

therefore, by setting the corresponding set threshold range, accurate and reliable basis can be provided for controlling the saturation temperature corresponding to the evaporation pressure or the condensation pressure, and the energy-saving control effect is favorably improved.

In an optional example, in the step S130 of controlling the saturation temperature corresponding to the evaporation pressure or the condensation pressure of the air conditioning system, controlling the saturation temperature corresponding to the condensation pressure of the air conditioning system may include: and if the difference is smaller than the lower limit of the third set threshold range (for example, the indoor environment temperature is less than the user set temperature of-2 ℃), controlling the saturation temperature corresponding to the condensing pressure of the air conditioning system to be a fourth set value (for example, controlling the saturation temperature corresponding to the condensing pressure of the system to be a D value).

for example: when the air conditioner is in heating operation, the indoor environment temperature is continuously increased, and if the indoor environment temperature is less than the user set temperature of-2 ℃, the saturation temperature corresponding to the condensing pressure of the control system is a D value.

Optionally, controlling the saturation temperature corresponding to the condensing pressure of the air conditioning system to be a fourth set value may specifically include: and adjusting at least one of the frequency of a compressor of the air conditioning system, the rotating speed of an outdoor fan and the opening degree of a throttling element in an adaptive manner to enable the saturation temperature corresponding to the condensing pressure to be a fourth set value.

for example: controlling the saturation temperature corresponding to the condensing pressure to be a fourth set value may include: and adjusting the output of the compressor and the fan, and integrating the change of the opening of the throttle valve to enable the saturation temperature corresponding to the condensing pressure to be a fourth set value.

For example: in the heating mode, the frequency of the compressor is increased, the rotation speed of the outdoor fan is reduced when the outdoor fan is in a high-pressure state, the rotation speed of the outdoor fan is increased when the outdoor fan is in a low-pressure state, the opening degree of the throttling element is reduced when a transition interval in which the condensing pressure is reduced becomes larger, and the opening degree of the throttling element is increased when the transition interval in which the condensing pressure is reduced becomes smaller.

from this, through controlling the saturation temperature that corresponds condensing pressure under the indoor ambient temperature to the difference, can promote the energy-conserving effect of heating the operation, and user experience can greatly promote.

In addition, under the heating mode, the difference value between the indoor environment temperature and the temperature set by the user is not larger than the set value (the indoor environment temperature is larger than the temperature set by the user and minus 2 ℃).

In an optional example, in the step S130 of controlling the saturation temperature corresponding to the evaporation pressure or the condensation pressure of the air conditioning system, controlling the saturation temperature corresponding to the condensation pressure of the air conditioning system may include: if the difference is equal to the lower limit of the third set threshold range (for example, the indoor environment temperature is equal to the user-set temperature of-2 ℃), the saturation temperature corresponding to the condensation pressure is controlled to be reduced, and the saturation temperature corresponding to the condensation pressure is not lower than a fifth set value (for example, the saturation temperature corresponding to the condensation pressure is controlled to be reduced to the lowest E value).

alternatively, a specific process of controlling the saturation temperature decrease corresponding to the condensing pressure can be further described with reference to a flow diagram of an embodiment of controlling the saturation temperature decrease corresponding to the condensing pressure in the method of the present invention shown in fig. 3.

and step S310, controlling the saturation temperature corresponding to the condensation pressure to reduce a second set temperature, and continuously determining the range of the difference value in the third set threshold range. The second set temperature may be the same as or different from the first set temperature.

More optionally, the controlling the saturation temperature corresponding to the condensing pressure to decrease the second set temperature in step S310 may include: and controlling the saturation temperature interval corresponding to the condensation pressure (for example, every sixth set time) to reduce the second set temperature.

more optionally, the controlling the saturation temperature corresponding to the condensing pressure to decrease the second set temperature in step S310 may include: and controlling the saturation temperature corresponding to the condensing pressure to reduce the second set temperature in a time delay way (for example, in a time delay way for the sixth set time).

For example: and if the indoor environment temperature is equal to the user set temperature of-2 ℃, controlling the saturation temperature corresponding to the condensation pressure to reduce the second set temperature every sixth set time and/or delaying the sixth set time. For example: the saturation temperature corresponding to the condensation pressure of the system is controlled to be reduced by 1 ℃ every 20 minutes, namely the condensation pressure is (D-1) DEG C after 20 minutes. And when the saturation temperature corresponding to the condensation pressure is reduced by the second set temperature, if the difference value is determined to be larger than or equal to the lower limit of the third set threshold range and smaller than or equal to the upper limit of the third set threshold range continuously within a fifth set time, continuing to control the saturation temperature corresponding to the condensation pressure to reduce the second set temperature every sixth set time and/or delaying the sixth set time, wherein the saturation temperature corresponding to the condensation pressure is not lower than a fifth set value. For example: and if the user set temperature-2 ℃ and indoor environment temperature are determined to be less than or equal to the user set temperature continuously, continuously controlling the saturation temperature corresponding to the condensation pressure of the system to be reduced by 1 ℃ every 20 minutes, namely controlling the condensation pressure to be (D-2) DEG C after 40 minutes, and controlling the saturation temperature corresponding to the condensation pressure not to be lower than the E value.

therefore, the saturation temperature corresponding to the condensing pressure is reduced through time separation or time delay, and the saturation temperature can be reduced when the compressor operates stably, so that the reliability and the stability of the saturation temperature control corresponding to the condensing pressure are improved, and unnecessary energy consumption is not brought due to frequent reduction.

In step S320, if it is determined that the difference is decreased to be greater than or equal to the lower limit of the third set threshold range and less than or equal to the upper limit of the third set threshold range within the fifth set time (for example, it is continuously determined that the indoor environment temperature is greater than or equal to the user set temperature and greater than or equal to-2 ℃; and less than or equal to the user set temperature), the saturation temperature corresponding to the condensing pressure is continuously controlled to decrease the second set temperature.

In an alternative specific example, controlling the saturation temperature decrease corresponding to the condensing pressure may specifically include: and the saturation temperature corresponding to the condensation pressure is reduced by adaptively increasing the frequency of a compressor of the air-conditioning system and adaptively adjusting at least one of the rotating speed of an outdoor fan and the opening degree of a throttling element of the air-conditioning system.

for example: controlling the saturation temperature reduction corresponding to the condensing pressure may include: and increasing the output of the compressor, and regulating the rotating speed of the outdoor fan and the opening of the throttle valve to reduce the saturation temperature corresponding to the condensation pressure.

in an alternative specific example, the making the saturation temperature corresponding to the condensing pressure not lower than the fifth set value may specifically include: and when the saturation temperature corresponding to the condensing pressure reaches the fifth set value, maintaining the state that the saturation temperature corresponding to the condensing pressure reaches the fifth set value by adaptively adjusting at least one of the frequency of a compressor of the air conditioning system and the rotating speed of an outdoor fan.

for example: making the saturation temperature corresponding to the condensing pressure not lower than a fifth set value may include: and controlling the output of the compressor and the fan to ensure that the saturation temperature corresponding to the condensing pressure reaches a fifth set value and then maintaining the state that the saturation temperature corresponding to the condensing pressure reaches the fifth set value.

therefore, after the saturation temperature corresponding to the condensing pressure is reduced, the difference between the indoor environment temperature and the temperature set by the user is continuously determined, and the saturation temperature corresponding to the condensing pressure is continuously controlled according to the difference, so that the temperature corresponding to the condensing pressure can be reduced on the one hand, and on the other hand, the reduction scheme can be timely adjusted according to the change of the difference between the indoor environment temperature and the temperature set by the user, and the flexibility and the reliability of heating energy-saving control are greatly improved.

for example: when the heating operation is performed, the indoor environment temperature is continuously increased, when the indoor environment temperature is equal to the user set temperature of-2 ℃, the saturation temperature corresponding to the condensing pressure of the control system is reduced by 1 ℃ every 20 minutes, namely the condensing pressure is (D-1) DEG C after 20 minutes, if the saturation temperature corresponding to the condensing pressure of the control system is continuously controlled to be not less than the user set temperature and not more than the indoor environment temperature which is equal to or more than the user set temperature after 20 minutes, the saturation temperature corresponding to the condensing pressure of the control system is continuously reduced by 1 ℃ every 20 minutes, namely the condensing pressure is controlled to be (D-2) DEG C after 40 minutes, and the lowest condensing pressure is controlled to.

In an optional example, the step S130 of controlling the saturation temperature corresponding to the condensing pressure of the air conditioning system in controlling the saturation temperature corresponding to the evaporating pressure or the condensing pressure of the air conditioning system may further include: if the difference is equal to the lower limit of the third set threshold range (for example, the indoor environment temperature is equal to the user set temperature-2 ℃), and after the saturation temperature corresponding to the condensation pressure is reduced, if the difference is determined (for example, determined continuously) to return to be less than the lower limit of the third set threshold range within a seventh set time (for example, it is determined that the indoor environment temperature returns to < the user set temperature-2 ℃), the saturation temperature corresponding to the condensation pressure is controlled to return to the fourth set value (for example, the condensation pressure of the control system returns to the value D).

For example: and under the condition that the difference is equal to the lower limit of the third set threshold range, when the saturation temperature corresponding to the condensation pressure is reduced by the second set temperature or the second set temperature is reduced again, if the difference is determined to recover to be less than the lower limit of the third set threshold range, controlling the protection temperature corresponding to the condensation pressure to recover to the fourth set value.

for example: and if the indoor environment temperature is recovered to be less than the user set temperature of-2 ℃ after the determination, the condensing pressure of the control system is recovered to be the value D.

wherein, the third set threshold range may include: -2 ℃ to 0.

Therefore, after the saturation temperature corresponding to the condensing pressure is controlled, when the difference between the indoor environment temperature and the user set temperature is recovered, the control of the saturation temperature corresponding to the condensing pressure is recovered to a corresponding state, so that the reliability and the stability of the heating operation of the air conditioner can be ensured, and the flexibility of the heating energy-saving control can also be ensured.

In an optional example, in the step S130 of controlling the saturation temperature corresponding to the evaporation pressure or the condensation pressure of the air conditioning system, the controlling the saturation temperature corresponding to the evaporation pressure of the air conditioning system may include: when the outdoor environment temperature is greater than or equal to the upper limit of the first set threshold range (for example, the outdoor environment temperature is greater than or equal to 20 ℃) or is less than or equal to the lower limit of the first set threshold range (for example, the outdoor environment temperature is less than or equal to 15 ℃), if the difference is greater than the upper limit of the second set threshold range (for example, the indoor environment temperature is greater than the user set temperature +3 ℃), the saturation temperature corresponding to the evaporation pressure is controlled to be a first set value (for example, the saturation temperature corresponding to the evaporation pressure of the system is controlled to be an A value).

for example: if the outdoor environment temperature is more than or equal to 20 ℃, the control mode is as follows: and during the refrigerating operation, the indoor environment temperature is continuously reduced, and if the indoor environment temperature is higher than the user set temperature plus 3 ℃, the saturation temperature corresponding to the evaporation pressure of the control system is an A value.

for example: if the outdoor environment temperature is less than or equal to 15 ℃, the control mode is as follows: and during the refrigerating operation, the indoor environment temperature is continuously reduced, and if the indoor environment temperature is higher than the user set temperature plus 3 ℃, the saturation temperature corresponding to the evaporation pressure of the control system is an A value.

Optionally, controlling the saturation temperature corresponding to the evaporation pressure to be a first set value specifically may include: and adjusting at least one of the frequency of a compressor of the air conditioning system, the rotating speed of an outdoor fan and the opening degree of a throttling element in an adaptive manner to enable the saturation temperature corresponding to the evaporation pressure to be the first set value.

For example: controlling the saturation temperature corresponding to the evaporation pressure to be a first set value may include: and adjusting the output of the compressor and the fan, and integrating the change of the opening of the throttle valve to enable the saturation temperature corresponding to the evaporation pressure to be a first set value.

For example: in the cooling mode, the frequency of the compressor is reduced, the rotation speed of the outdoor fan is reduced when the outdoor fan is in a high-pressure state, the rotation speed of the outdoor fan is increased when the outdoor fan is in a low-pressure state, the opening degree of the throttling element is reduced when a transition interval in which the evaporation pressure is increased becomes larger, and the opening degree of the throttling element is increased when the transition interval in which the evaporation pressure is increased becomes smaller.

In an optional example, in the step S130 of controlling the saturation temperature corresponding to the evaporation pressure or the condensation pressure of the air conditioning system, the controlling the saturation temperature corresponding to the evaporation pressure of the air conditioning system may include: when the outdoor environment temperature is greater than or equal to the upper limit of the first set threshold range (for example, the outdoor environment temperature is greater than or equal to 20 ℃), if the difference is equal to the upper limit of the second set threshold range (for example, the indoor environment temperature is equal to the user set temperature +3 ℃), the saturation temperature corresponding to the evaporation pressure is controlled to increase, and the saturation temperature corresponding to the evaporation pressure is not greater than a second set value (for example, the saturation temperature corresponding to the evaporation pressure is controlled to be increased to a B value at most).

optionally, a specific process for controlling the saturation temperature increase corresponding to the evaporation pressure may be further described with reference to a flowchart of an embodiment of controlling the saturation temperature increase corresponding to the evaporation pressure in the method of the present invention shown in fig. 2.

And step S210, controlling the saturation temperature corresponding to the evaporation pressure to increase by a first set temperature, and continuously determining the range of the difference value in the second set threshold range.

More optionally, the controlling the saturation temperature corresponding to the evaporation pressure to increase by the first set temperature in step S210 may include: the first set temperature is increased at saturation temperature intervals corresponding to the evaporation pressure (e.g., every third set time, such as every 20 minutes).

more optionally, the controlling the saturation temperature corresponding to the evaporation pressure to increase by the first set temperature in step S210 may include: and controlling the saturation temperature corresponding to the evaporation pressure to delay (for example, delaying for a third set time, such as 20 minutes) the first set temperature.

For example: when the outdoor environment temperature is greater than or equal to the upper limit of the first set threshold range, if the difference is equal to the upper limit of the second set threshold range (for example, the indoor environment temperature is equal to the user set temperature +3 ℃), controlling the saturation temperature corresponding to the evaporation pressure to increase the first set temperature every set time (for example, a third set time, such as 20 minutes), and/or delaying the set time (for example, the third set time, such as 20 minutes). For example: the saturation temperature corresponding to the evaporation pressure of the system is controlled to increase by 1 ℃ every 20 minutes, namely the evaporation pressure is (A +1) DEG C after 20 minutes. When the saturation temperature corresponding to the evaporation pressure is increased by the first set temperature, if it is determined that the difference value is greater than or equal to the lower limit of the second set threshold range and less than or equal to the upper limit of the second set threshold range continuously within a certain time (for example, a second set time), the saturation temperature corresponding to the evaporation pressure is continuously controlled to increase the first set temperature every other set time (for example, a third set time, such as 20 minutes) and/or the set time is delayed (for example, the third set time, such as 20 minutes), and the saturation temperature corresponding to the evaporation pressure does not exceed the second set value. For example: and continuously controlling the saturation temperature corresponding to the evaporation pressure of the system to increase by 1 ℃ every 20 minutes, namely controlling the evaporation pressure to be (A +2) DEG C after 40 minutes, and controlling the saturation temperature corresponding to the evaporation pressure to be maximally increased to a value B.

therefore, the saturation temperature corresponding to the evaporation pressure is increased through time separation or time delay, the saturation temperature can be reduced when the operation of the compressor is stable, the reliability and the stability of the saturation temperature control corresponding to the evaporation pressure are improved, and unnecessary energy consumption cannot be caused due to frequent increase.

Step S220, after the saturation temperature corresponding to the evaporation pressure is controlled to increase the first set temperature, if it is determined within a second set time that the difference is decreased to be greater than or equal to a second set threshold range lower limit and less than or equal to a second set threshold range upper limit (for example, it is continuously determined that the user set temperature is less than or equal to the indoor ambient temperature and less than or equal to the user set temperature +3 ℃), continuing to control the saturation temperature corresponding to the evaporation pressure to increase the first set temperature.

For example: if the outdoor environment temperature is more than or equal to 20 ℃, the control mode is as follows: when the refrigeration operation is carried out, the indoor environment temperature is continuously reduced, when the indoor environment temperature is equal to the user set temperature plus 3 ℃, the saturation temperature corresponding to the evaporation pressure of the control system is reduced by 1 ℃ every 20 minutes, namely the evaporation pressure is (A +1) DEG C after 20 minutes, if the saturation temperature corresponding to the evaporation pressure of the control system is continuously determined to be not more than the user set temperature and not more than the user set temperature plus 3℃, the saturation temperature corresponding to the evaporation pressure of the control system is continuously controlled to be reduced by 1 ℃ every 20 minutes, namely the evaporation pressure is controlled to be (A +2) DEG C after 40 minutes, and the highest control evaporation pressure can be reduced to the value B.

for example: and when the indoor environment temperature is determined to be equal to the user set temperature plus 3 ℃, after the temperature is reduced by 1 ℃ when the timing 20min arrives, within the preset time, if the indoor environment temperature is determined to be equal to or less than the user set temperature plus 3 ℃ continuously, the temperature is reduced by 1 ℃ when the timing 20min arrives.

for example: when the indoor environment temperature is determined to be +3 ℃ which is the temperature set by the user, reducing the temperature by 1 ℃ every 20min, and simultaneously continuing to determine; if the temperature of the indoor environment is less than or equal to the temperature set by the user and +3 ℃ is continuously determined within the preset time, the temperature is continuously reduced by 1 ℃ every 20 min.

in an alternative specific example, controlling the saturation temperature increase corresponding to the evaporation pressure may specifically include: and reducing the frequency of a compressor of the air conditioning system through adaptation, and adjusting at least one of the rotating speed of an outdoor fan and the opening degree of a throttling element of the air conditioning system through adaptation, so that the saturation temperature corresponding to the evaporation pressure is increased.

for example: controlling the saturation temperature increase corresponding to the evaporation pressure may include: and reducing the output of the compressor, and adjusting the rotating speed of an outdoor fan and the opening of a throttle valve so as to increase the saturation temperature corresponding to the evaporation pressure.

In an alternative specific example, the making the saturation temperature corresponding to the evaporation pressure not exceed the second set value may specifically include: and when the saturation temperature corresponding to the evaporation pressure reaches the second set value, maintaining the state that the saturation temperature corresponding to the evaporation pressure reaches the second set value by adaptively adjusting at least one of the frequency of a compressor of the air conditioning system and the rotating speed of an outdoor fan.

For example: causing the saturation temperature corresponding to the evaporation pressure not to exceed a second set value may include: and controlling the output of the compressor and the fan to ensure that the saturation temperature corresponding to the evaporation pressure reaches a second set value and then maintaining the state that the saturation temperature corresponding to the evaporation pressure reaches the second set value.

therefore, after the saturation temperature corresponding to the evaporation pressure is increased, the difference between the indoor environment temperature and the temperature set by the user is continuously determined, and the saturation temperature corresponding to the evaporation pressure is continuously controlled according to the difference, so that the temperature corresponding to the evaporation pressure can be reduced on the one hand, and on the other hand, the increase scheme can be timely adjusted according to the change of the difference between the indoor environment temperature and the temperature set by the user, and the flexibility and the reliability of refrigeration energy-saving control are greatly improved.

in addition, in the cooling mode, when the indoor environment temperature is lower than the set temperature, the unit is stopped, so that the situation that the difference value between the indoor environment temperature and the set temperature of the user is lower than the set value (for example, the indoor environment temperature is lower than the set temperature of the user and is +3 ℃) can not occur.

In an optional example, in the step S130 of controlling the saturation temperature corresponding to the evaporation pressure or the condensation pressure of the air conditioning system, the controlling the saturation temperature corresponding to the evaporation pressure of the air conditioning system may include: when the outdoor environment temperature is less than or equal to the first set threshold range lower limit (for example, the outdoor environment temperature is less than or equal to 15 ℃), if the difference is determined to be greater than or equal to the second set threshold range lower limit and less than or equal to the second set threshold range upper limit within the first set time (for example, if the user set temperature is continuously determined to be less than or equal to the indoor environment temperature and less than or equal to the user set temperature +3 ℃), controlling the saturation temperature corresponding to the evaporation pressure to be a third set value (for example, the saturation temperature corresponding to the evaporation pressure of the system is a C value).

for example: if the outdoor environment temperature is less than or equal to 15 ℃, the control mode is as follows: when the refrigeration operation is carried out, if the condition that the indoor environment temperature is not lower than the user set temperature and not higher than the user set temperature plus 3 ℃ is continuously determined, the saturation temperature corresponding to the evaporation pressure of the system is the value C.

For example: the magnitude relationship among the a value, the B value, the C value, the D value, and the E value may be sequentially increased or may be a relationship in which the magnitude is not limited.

Optionally, controlling the saturation temperature corresponding to the evaporation pressure to be a third set value specifically may include: adjusting at least one of the frequency of a compressor of the air conditioning system, the rotating speed of an outdoor fan and the opening degree of a throttling element in an adaptive manner to enable the saturation temperature corresponding to the evaporation pressure to be the third set value

For example: controlling the saturation temperature corresponding to the evaporation pressure to be a third set value may include: and adjusting the output of the compressor and the fan, and integrating the change of the opening of the throttle valve to enable the saturation temperature corresponding to the evaporation pressure to be a third set value.

in an optional example, in the step S130 of controlling the saturation temperature corresponding to the evaporation pressure or the condensation pressure of the air conditioning system, the controlling the saturation temperature corresponding to the evaporation pressure of the air conditioning system may include: and when the outdoor environment temperature is greater than the lower limit of the first set threshold range and less than the upper limit of the first set threshold range (for example, 15 ℃ C. < external environment temperature < 20 ℃ C.), maintaining the previous control (for example, maintaining the previous control) of the saturation temperature corresponding to the evaporation pressure.

For example: the temperature of the outdoor environment is more than 15 ℃ and less than 20 ℃, and the last control is maintained in the transition region.

For example: and when the temperature of the external environment rises from 13 ℃ to 16 ℃, entering a transition region, and controlling according to a control mode that the temperature of the external environment is less than or equal to 15 ℃. And when the temperature of the external environment is reduced from 23 ℃ to 16 ℃, entering a transition interval and controlling according to a control mode that the temperature of the external environment is more than or equal to 20 ℃.

from this, through controlling the saturation temperature that corresponds evaporating pressure under outdoor ambient temperature and the indoor ambient temperature to the difference, can promote the energy-conserving effect of refrigeration operation, and user experience can greatly promote.

In an optional example, the step S130 of controlling the saturation temperature corresponding to the evaporation pressure or the condensation pressure of the air conditioning system may further include: when the outdoor environment temperature is larger than or equal to the upper limit of the first set threshold range (for example, the outdoor environment temperature is larger than or equal to 20 ℃), after the saturation temperature corresponding to the evaporation pressure is controlled to increase; and/or when the outdoor environment temperature is less than or equal to the lower limit of the first set threshold range (for example, the outdoor environment temperature is less than or equal to 15 ℃), after the saturation temperature corresponding to the evaporation pressure is controlled to be a third set value, if the difference value is determined (for example, determined continuously) to recover to be greater than the upper limit of the second set threshold range within a fourth set time (for example, the indoor environment temperature recovers to be greater than the user set temperature +3 ℃), controlling the saturation temperature corresponding to the evaporation pressure to recover to the first set value (for example, the evaporation pressure of a control system recovers to be the value A).

For example: and under the condition that the outdoor environment temperature is greater than or equal to the upper limit of a first set threshold range and the difference is equal to the upper limit of a second set threshold range, when the saturation temperature corresponding to the evaporation pressure is increased by the first set temperature or the first set temperature is increased again, if the difference is determined to be recovered to be greater than the upper limit of the second set threshold range, controlling the protection temperature corresponding to the evaporation pressure to be recovered to the first set value.

for example: if the outdoor environment temperature is more than or equal to 20 ℃, the control mode is as follows: and if the indoor environment temperature is determined to be recovered to be more than the user set temperature plus 3 ℃, the evaporation pressure of the control system is recovered to be the value A. For example: only when the refrigeration is operated, the evaporation pressure is controlled to be recovered to the value A.

For example: under the conditions that the outdoor environment temperature is less than or equal to a first set threshold range lower limit, the difference value is greater than or equal to a second set threshold range lower limit and less than or equal to a second set threshold range upper limit, when the saturation temperature corresponding to the evaporation pressure is the third set value, if the difference value is determined to recover to be greater than the second set threshold range upper limit, the protection temperature corresponding to the evaporation pressure is controlled to recover to the first set value.

for example: if the outdoor environment temperature is less than or equal to 15 ℃, the control mode is as follows: and if the indoor environment temperature is determined to be recovered to be more than the user set temperature plus 3 ℃, the evaporation pressure of the control system is recovered to be the value A.

The first set threshold range may include: 15-20 ℃; and/or, the second set threshold range may include: 0 to 3 ℃.

therefore, after the saturation temperature corresponding to the evaporation pressure is controlled, when the difference between the indoor environment temperature and the user set temperature is recovered, the control of the saturation temperature corresponding to the evaporation pressure is recovered to a corresponding state, so that the reliability and the stability of the air conditioner refrigeration operation can be ensured, and the flexibility of refrigeration energy-saving control can also be ensured.

through a large amount of tests, the technical scheme of the embodiment is adopted, and the change of the evaporation pressure or the condensation pressure is controlled by monitoring the difference between the indoor environment temperature and the temperature set by a client in real time, so that the output of the compressor achieves the best energy-saving effect.

According to an embodiment of the invention, a control device of an air conditioning system (for example, a control device of an energy-saving operation multi-split air conditioning system) corresponding to the control method of the air conditioning system is also provided. Referring to fig. 4, a schematic diagram of an embodiment of the apparatus of the present invention is shown. The control device of the air conditioning system may include: an acquisition unit 102, a determination unit 104, and a control unit 106.

in an optional example, the obtaining unit 102 may be configured to obtain an indoor ambient temperature and a user-set temperature of the air conditioning system. The specific functions and processes of the acquiring unit 102 are referred to in step S110.

In an optional example, the determining unit 104 may be configured to determine a difference between the indoor ambient temperature and the user-set temperature. The specific function and processing of the determination unit 104 are referred to in step S120.

In an alternative example, the control unit 106 may be configured to control a saturation temperature corresponding to an evaporation pressure or a condensation pressure of the air conditioning system according to an operation mode of the air conditioning system and the difference.

In an alternative embodiment, the operation mode may include: a cooling mode or a heating mode.

In an optional example, the controlling unit 106 may control a saturation temperature corresponding to an evaporation pressure or a condensation pressure of the air conditioning system, and may include: when the operation mode is the refrigeration mode, controlling the saturation temperature corresponding to the evaporation pressure of the air conditioning system; and when the operation mode is the heating mode, controlling the saturation temperature corresponding to the condensation pressure of the air conditioning system.

In an alternative embodiment, the method may further include: the obtaining unit 102 may be further configured to obtain an outdoor ambient temperature of the air conditioning system.

In an optional example, the controlling unit 106 controls a saturation temperature corresponding to an evaporation pressure or a condensation pressure of the air conditioning system, and may further include: and when the operation mode is a refrigeration mode, controlling the saturation temperature corresponding to the evaporation pressure of the air conditioning system according to the outdoor environment temperature and the difference value.

for example: during cooling operation, according to the range of the outdoor environment temperature (for example, the range of the outdoor environment temperature in the first set threshold range) and/or the range of the difference (for example, the range of the difference in the second set threshold range), controlling the saturation temperature corresponding to the evaporation pressure of the air conditioning system (for example, the evaporation pressure of an evaporator during cooling operation) to realize cooling energy-saving control on the air conditioner (see the example shown in fig. 5); and/or controlling the saturation temperature corresponding to the condensing pressure of the air conditioning system (for example, the condensing pressure of the condenser during the heating operation) according to the range of the difference value in the third set threshold range (for example, according to the range of the difference value in the third set threshold range) during the heating operation, so as to realize the heating energy-saving control of the air conditioner (see the example shown in fig. 6). The specific function and processing of the control unit 106 are shown in step S130.

In an optional example, the controlling unit 106 controls a saturation temperature corresponding to an evaporation pressure or a condensation pressure of the air conditioning system, and may further include: and when the operation mode is a heating mode, controlling the protection temperature corresponding to the condensing pressure of the air conditioning system according to the difference.

in an alternative embodiment, the method may further include: a setting unit 108.

In an optional example, the setting unit 108 may be configured to set a first set threshold range, a second set threshold range, and a third set threshold range.

Optionally, the controlling unit 106 controls a saturation temperature corresponding to the condensing pressure of the air conditioning system in the saturation temperature corresponding to the evaporating pressure or the condensing pressure of the air conditioning system, and specifically may include: and if the difference is smaller than the lower limit of the third set threshold range (for example, the indoor environment temperature is less than the user set temperature of-2 ℃), controlling the saturation temperature corresponding to the condensing pressure of the air conditioning system to be a fourth set value (for example, controlling the saturation temperature corresponding to the condensing pressure of the system to be a D value).

In an optional specific example, the controlling unit 106 may control the saturation temperature corresponding to the condensing pressure of the air conditioning system to be a fourth set value, and specifically includes: and adjusting at least one of the frequency of a compressor of the air conditioning system, the rotating speed of an outdoor fan and the opening degree of a throttling element in an adaptive manner to enable the saturation temperature corresponding to the condensing pressure to be a fourth set value.

Optionally, the controlling unit 106 controls a saturation temperature corresponding to the condensing pressure of the air conditioning system in the saturation temperature corresponding to the evaporating pressure or the condensing pressure of the air conditioning system, and specifically may include: if the difference is equal to the lower limit of the third set threshold range (for example, the indoor environment temperature is equal to the user-set temperature of-2 ℃), the saturation temperature corresponding to the condensation pressure is controlled to be reduced, and the saturation temperature corresponding to the condensation pressure is not lower than a fifth set value (for example, the saturation temperature corresponding to the condensation pressure is controlled to be reduced to the lowest E value).

More optionally, the controlling unit 106 controls the saturation temperature corresponding to the condensing pressure to decrease, which specifically includes: and controlling the saturation temperature corresponding to the condensation pressure to reduce a second set temperature, and continuously determining the range of the difference value in the third set threshold range. The second set temperature may be the same as or different from the first set temperature. The specific functions and processes of the control unit 106 are also referred to in step S310.

in a more optional specific example, the controlling unit 106 controls the saturation temperature corresponding to the condensing pressure to decrease by the second set temperature, which may specifically include: and controlling the saturation temperature interval corresponding to the condensation pressure (for example, every sixth set time) to reduce the second set temperature.

in a more optional specific example, the controlling unit 106 controls the saturation temperature corresponding to the condensing pressure to decrease by the second set temperature, which may specifically include: and controlling the saturation temperature corresponding to the condensing pressure to reduce the second set temperature in a time delay way (for example, in a time delay way for the sixth set time).

more optionally, the controlling unit 106 controls the saturation temperature corresponding to the condensing pressure to decrease, and specifically, the controlling unit may further include: and if the difference is determined to be reduced to be greater than or equal to the lower limit of the third set threshold range and less than or equal to the upper limit of the third set threshold range within a fifth set time (for example, the user set temperature-2 ℃ and less than or equal to the indoor environment temperature and less than or equal to the user set temperature are continuously determined), continuing to control the saturation temperature corresponding to the condensation pressure to reduce the second set temperature. The specific functions and processes of the control unit 106 are also referred to in step S320.

In an optional specific example, the controlling unit 106 controls the saturation temperature corresponding to the condensing pressure to decrease, which may specifically include: and the saturation temperature corresponding to the condensation pressure is reduced by adaptively increasing the frequency of a compressor of the air-conditioning system and adaptively adjusting at least one of the rotating speed of an outdoor fan and the opening degree of a throttling element of the air-conditioning system.

In an optional specific example, the controlling unit 106 may set the saturation temperature corresponding to the condensing pressure not to be lower than a fifth set value, and specifically include: and when the saturation temperature corresponding to the condensing pressure reaches the fifth set value, maintaining the state that the saturation temperature corresponding to the condensing pressure reaches the fifth set value by adaptively adjusting at least one of the frequency of a compressor of the air conditioning system and the rotating speed of an outdoor fan.

Optionally, the controlling unit 106 controls a saturation temperature corresponding to the condensing pressure of the air conditioning system in the saturation temperature corresponding to the evaporating pressure or the condensing pressure of the air conditioning system, and may further include: if the difference is equal to the lower limit of the third set threshold range (for example, the indoor environment temperature is equal to the user set temperature-2 ℃), and after the saturation temperature corresponding to the condensation pressure is reduced, if the difference is determined (for example, determined continuously) to return to be less than the lower limit of the third set threshold range within a seventh set time (for example, it is determined that the indoor environment temperature returns to < the user set temperature-2 ℃), the saturation temperature corresponding to the condensation pressure is controlled to return to the fourth set value (for example, the condensation pressure of the control system returns to the value D).

Wherein, the third set threshold range may include: -2 ℃ to 0.

Optionally, the controlling unit 106 controls the saturation temperature corresponding to the evaporation pressure of the air conditioning system in the saturation temperature corresponding to the evaporation pressure or the condensation pressure of the air conditioning system, and specifically may include: when the outdoor environment temperature is greater than or equal to the upper limit of the first set threshold range (for example, the outdoor environment temperature is greater than or equal to 20 ℃) or is less than or equal to the lower limit of the first set threshold range (for example, the outdoor environment temperature is less than or equal to 15 ℃), if the difference is greater than the upper limit of the second set threshold range (for example, the indoor environment temperature is greater than the user set temperature +3 ℃), the saturation temperature corresponding to the evaporation pressure is controlled to be a first set value (for example, the saturation temperature corresponding to the evaporation pressure of the system is controlled to be an A value).

in an optional specific example, the controlling unit 106 controls the saturation temperature corresponding to the evaporation pressure to be a first set value, which may specifically include: and adjusting at least one of the frequency of a compressor of the air conditioning system, the rotating speed of an outdoor fan and the opening degree of a throttling element in an adaptive manner to enable the saturation temperature corresponding to the evaporation pressure to be the first set value.

Optionally, the controlling unit 106 controls the saturation temperature corresponding to the evaporation pressure of the air conditioning system in the saturation temperature corresponding to the evaporation pressure or the condensation pressure of the air conditioning system, and specifically may include: when the outdoor environment temperature is greater than or equal to the upper limit of the first set threshold range (for example, the outdoor environment temperature is greater than or equal to 20 ℃), if the difference is equal to the upper limit of the second set threshold range (for example, the indoor environment temperature is equal to the user set temperature +3 ℃), the saturation temperature corresponding to the evaporation pressure is controlled to increase, and the saturation temperature corresponding to the evaporation pressure is not greater than a second set value (for example, the saturation temperature corresponding to the evaporation pressure is controlled to be increased to a B value at most).

More optionally, the controlling unit 106 controls the saturation temperature increase corresponding to the evaporation pressure, which specifically includes: and controlling the saturation temperature corresponding to the evaporation pressure to increase by a first set temperature, and continuously determining the range of the difference value in the second set threshold range. The specific functions and processes of the control unit 106 are also referred to in step S210.

In a more optional specific example, the controlling unit 106 controls the saturation temperature corresponding to the evaporation pressure to increase by the first set temperature, which may specifically include: the first set temperature is increased at saturation temperature intervals corresponding to the evaporation pressure (e.g., every third set time, such as every 20 minutes).

In a more optional specific example, the controlling unit 106 controls the saturation temperature corresponding to the evaporation pressure to increase by the first set temperature, which may specifically include: and controlling the saturation temperature corresponding to the evaporation pressure to delay (for example, delaying for a third set time, such as 20 minutes) the first set temperature.

more optionally, the controlling unit 106 controls the saturation temperature increase corresponding to the evaporation pressure, and may specifically include: after the saturation temperature corresponding to the evaporation pressure is controlled to be increased by the first set temperature, if the difference is determined to be reduced to be greater than or equal to the lower limit of the second set threshold range and less than or equal to the upper limit of the second set threshold range within a second set time (for example, the user set temperature is continuously determined to be less than or equal to the indoor environment temperature and less than or equal to the user set temperature +3 ℃), the saturation temperature corresponding to the evaporation pressure is continuously controlled to be increased by the first set temperature. The specific function and processing of the control unit 106 are also referred to in step S220.

in an optional specific example, the controlling unit 106 controls the saturation temperature increase corresponding to the evaporation pressure, which may specifically include: and reducing the frequency of a compressor of the air conditioning system through adaptation, and adjusting at least one of the rotating speed of an outdoor fan and the opening degree of a throttling element of the air conditioning system through adaptation, so that the saturation temperature corresponding to the evaporation pressure is increased.

in an optional specific example, the causing, by the control unit 106, the saturation temperature corresponding to the evaporation pressure not to exceed the second set value may specifically include: and when the saturation temperature corresponding to the evaporation pressure reaches the second set value, maintaining the state that the saturation temperature corresponding to the evaporation pressure reaches the second set value by adaptively adjusting at least one of the frequency of a compressor of the air conditioning system and the rotating speed of an outdoor fan.

Optionally, the controlling unit 106 controls the saturation temperature corresponding to the evaporation pressure of the air conditioning system in the saturation temperature corresponding to the evaporation pressure or the condensation pressure of the air conditioning system, and specifically may include: when the outdoor environment temperature is less than or equal to the first set threshold range lower limit (for example, the outdoor environment temperature is less than or equal to 15 ℃), if the difference is determined to be greater than or equal to the second set threshold range lower limit and less than or equal to the second set threshold range upper limit within the first set time (for example, if the user set temperature is continuously determined to be less than or equal to the indoor environment temperature and less than or equal to the user set temperature +3 ℃), controlling the saturation temperature corresponding to the evaporation pressure to be a third set value (for example, the saturation temperature corresponding to the evaporation pressure of the system is a C value).

optionally, the controlling unit 106 controls the saturation temperature corresponding to the evaporation pressure of the air conditioning system in the saturation temperature corresponding to the evaporation pressure or the condensation pressure of the air conditioning system, and specifically may include: and when the outdoor environment temperature is greater than the lower limit of the first set threshold range and less than the upper limit of the first set threshold range (for example, 15 ℃ C. < external environment temperature < 20 ℃ C.), maintaining the previous control (for example, maintaining the previous control) of the saturation temperature corresponding to the evaporation pressure.

Optionally, the controlling unit 106 controls a saturation temperature corresponding to the evaporation pressure of the air conditioning system in the saturation temperature corresponding to the evaporation pressure or the condensation pressure of the air conditioning system, and may further include: when the outdoor environment temperature is larger than or equal to the upper limit of the first set threshold range (for example, the outdoor environment temperature is larger than or equal to 20 ℃), after the saturation temperature corresponding to the evaporation pressure is controlled to increase; and/or when the outdoor environment temperature is less than or equal to the lower limit of the first set threshold range (for example, the outdoor environment temperature is less than or equal to 15 ℃), after the saturation temperature corresponding to the evaporation pressure is controlled to be a third set value, if the difference value is determined (for example, determined continuously) to recover to be greater than the upper limit of the second set threshold range within a fourth set time (for example, the indoor environment temperature recovers to be greater than the user set temperature +3 ℃), controlling the saturation temperature corresponding to the evaporation pressure to recover to the first set value (for example, the evaporation pressure of a control system recovers to be the value A).

For example: if the outdoor environment temperature is more than or equal to 20 ℃, the control mode is as follows: and if the indoor environment temperature is determined to be recovered to be more than the user set temperature plus 3 ℃, the evaporation pressure of the control system is recovered to be the value A.

since the processes and functions implemented by the apparatus of this embodiment substantially correspond to the embodiments, principles and examples of the method shown in fig. 1 to 3, the description of this embodiment is not detailed, and reference may be made to the related descriptions in the foregoing embodiments, which are not repeated herein.

through a large number of tests, the technical scheme of the invention is adopted, different evaporation pressures and condensation pressures are controlled by determining the outdoor environment temperature, the indoor environment temperature and the set temperature of a user, and the output of the compressor and the output of the fan are controlled to achieve the optimal effect on the premise of ensuring the indoor refrigeration or heating effect, so that the system achieves the optimal effect.

according to an embodiment of the present invention, there is also provided an air conditioning system corresponding to a control device of the air conditioning system. The air conditioning system may include: the control device of the air conditioning system described above.

Since the processing and functions of the air conditioning system of this embodiment are basically corresponding to the embodiments, principles and examples of the apparatus shown in fig. 4, the description of this embodiment is not given in detail, and reference may be made to the related descriptions in the embodiments, which are not described herein again.

Through a large number of tests, the technical scheme of the invention controls different evaporating pressures and condensing pressures according to the difference between the indoor environment temperature and the user set temperature under different outdoor environment temperatures so as to achieve the optimal energy saving performance of the system on the premise of better ensuring the indoor refrigeration or heating effect and ensure higher control precision.

in summary, it is readily understood by those skilled in the art that the advantageous modes described above can be freely combined and superimposed without conflict.

the above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A control method of an air conditioning system, comprising:

Acquiring the indoor ambient temperature and the user set temperature of the air conditioning system, and acquiring the outdoor ambient temperature of the air conditioning system;

Determining a difference between the indoor ambient temperature and the user set temperature;

controlling the saturation temperature corresponding to the evaporation pressure or the condensation pressure of the air conditioning system according to the operation mode of the air conditioning system and the difference value, wherein the control method comprises the following steps:

when the operation mode is a refrigeration mode, controlling the saturation temperature corresponding to the evaporation pressure of the air conditioning system according to the outdoor environment temperature and the difference value, and the method comprises the following steps:

When the outdoor environment temperature is greater than or equal to the upper limit of a first set threshold range or less than or equal to the lower limit of the first set threshold range, if the difference is greater than the upper limit of a second set threshold range, controlling the saturation temperature corresponding to the evaporation pressure to be a first set value; or when the outdoor environment temperature is greater than or equal to the upper limit of the first set threshold range, if the difference is equal to the upper limit of a second set threshold range, controlling the saturation temperature corresponding to the evaporation pressure to increase, and enabling the saturation temperature corresponding to the evaporation pressure not to exceed a second set value; or when the outdoor environment temperature is less than or equal to the lower limit of the first set threshold range, if the difference is greater than or equal to the lower limit of the second set threshold range and less than or equal to the upper limit of the second set threshold range, controlling the saturation temperature corresponding to the evaporation pressure to be a third set value; or when the outdoor environment temperature is greater than the lower limit of the first set threshold range and less than the upper limit of the first set threshold range, maintaining the previous control of the saturation temperature corresponding to the evaporation pressure;

When the operation mode is a heating mode, controlling the protection temperature corresponding to the condensing pressure of the air conditioning system according to the difference, and the method comprises the following steps:

If the difference is smaller than the lower limit of the third set threshold range, controlling the saturation temperature corresponding to the condensing pressure of the air conditioning system to be a fourth set value; or if the difference is equal to the lower limit of the third set threshold range, controlling the saturation temperature corresponding to the condensing pressure to be reduced, and enabling the saturation temperature corresponding to the condensing pressure not to be lower than a fifth set value.

2. The method of claim 1, wherein the operating mode comprises: a cooling mode or a heating mode;

The controlling of the saturation temperature corresponding to the evaporation pressure or the condensation pressure of the air conditioning system comprises:

when the operation mode is the refrigeration mode, controlling the saturation temperature corresponding to the evaporation pressure of the air conditioning system;

and when the operation mode is the heating mode, controlling the saturation temperature corresponding to the condensation pressure of the air conditioning system.

3. the method of claim 1, wherein controlling the saturation temperature increase for the evaporating pressure comprises:

Controlling the saturation temperature corresponding to the evaporation pressure to increase by a first set temperature;

And if the difference is reduced to be larger than or equal to a second set threshold range lower limit and smaller than or equal to a second set threshold range upper limit, continuing to control the saturation temperature corresponding to the evaporation pressure to increase the first set temperature.

4. The method of claim 3, wherein controlling the saturation temperature corresponding to the evaporating pressure to increase by a first set temperature comprises:

controlling the saturation temperature interval corresponding to the evaporation pressure to increase the first set temperature; and/or the presence of a gas in the gas,

and controlling the saturation temperature corresponding to the evaporation pressure to increase the first set temperature in a delayed manner.

5. The method of claim 1, wherein,

Controlling the saturation temperature corresponding to the evaporation pressure to be a first set value and/or controlling the saturation temperature corresponding to the evaporation pressure to be a third set value specifically comprises:

Adjusting at least one of the frequency of a compressor of the air conditioning system, the rotating speed of an outdoor fan and the opening degree of a throttling element in a matching manner to enable the saturation temperature corresponding to the evaporation pressure to be the first set value and/or enable the saturation temperature corresponding to the evaporation pressure to be the third set value;

And/or the presence of a gas in the gas,

controlling the saturation temperature increase corresponding to the evaporation pressure specifically comprises:

Reducing the frequency of a compressor of the air conditioning system in an adaptive manner, and adjusting at least one of the rotating speed of an outdoor fan and the opening degree of a throttling element of the air conditioning system in an adaptive manner, so that the saturation temperature corresponding to the evaporation pressure is increased;

And/or the presence of a gas in the gas,

Making the saturation temperature corresponding to the evaporation pressure not exceed a second set value specifically includes:

and when the saturation temperature corresponding to the evaporation pressure reaches the second set value, maintaining the state that the saturation temperature corresponding to the evaporation pressure reaches the second set value by adaptively adjusting at least one of the frequency of a compressor of the air conditioning system and the rotating speed of an outdoor fan.

6. The method of claim 3 or 4, wherein,

and/or the presence of a gas in the gas,

7. the method of claim 1,

controlling the saturation temperature corresponding to the evaporating pressure of the air conditioning system, further comprising:

After the saturation temperature corresponding to the control of the evaporation pressure is increased, and/or after the saturation temperature corresponding to the control of the evaporation pressure is a third set value,

if the difference value is recovered to be larger than the upper limit of the second set threshold range, controlling the saturation temperature corresponding to the evaporation pressure to recover to the first set value;

wherein the content of the first and second substances,

The first set threshold range includes: 15-20 ℃; and/or the presence of a gas in the gas,

the second set threshold range includes: 0 to 3 ℃.

8. The method according to one of claims 3 to 5,

Wherein the content of the first and second substances,

The second set threshold range includes: 0 to 3 ℃.

9. the method of claim 6,

Wherein the content of the first and second substances,

The second set threshold range includes: 0 to 3 ℃.

10. the method of claim 1, wherein controlling the saturation temperature reduction for the condensing pressure comprises:

Controlling the saturation temperature corresponding to the condensing pressure to reduce a second set temperature;

and if the difference is reduced to be larger than or equal to the lower limit of the third set threshold range and smaller than or equal to the upper limit of the third set threshold range, continuing to control the saturation temperature corresponding to the condensation pressure to reduce the second set temperature.

11. The method of claim 10, wherein controlling the saturation temperature for the condensing pressure to decrease by a second set temperature comprises:

reducing the second set temperature when controlling the saturation temperature interval corresponding to the condensing pressure; and/or the presence of a gas in the gas,

And controlling the saturation temperature corresponding to the condensing pressure to reduce the second set temperature in a delayed manner.

12. The method of claim 1, wherein,

Controlling the saturation temperature corresponding to the condensing pressure of the air conditioning system to be a fourth set value specifically comprises:

Adjusting at least one of the frequency of a compressor of the air conditioning system, the rotating speed of an outdoor fan and the opening of a throttling element in an adaptive manner to enable the saturation temperature corresponding to the condensing pressure to be a fourth set value;

And/or the presence of a gas in the gas,

Controlling the saturation temperature reduction corresponding to the condensing pressure specifically comprises:

The saturation temperature corresponding to the condensation pressure is reduced by adaptively increasing the frequency of a compressor of the air-conditioning system and adaptively adjusting at least one of the rotating speed of an outdoor fan and the opening degree of a throttling element of the air-conditioning system;

and/or the presence of a gas in the gas,

making the saturation temperature corresponding to the condensing pressure not lower than a fifth set value specifically comprises:

and when the saturation temperature corresponding to the condensing pressure reaches the fifth set value, maintaining the state that the saturation temperature corresponding to the condensing pressure reaches the fifth set value by adaptively adjusting at least one of the frequency of a compressor of the air conditioning system and the rotating speed of an outdoor fan.

13. The method according to any one of claims 3-5, 7, 9, 10, 11, wherein,

and/or the presence of a gas in the gas,

And/or the presence of a gas in the gas,

14. The method of claim 6, wherein,

And/or the presence of a gas in the gas,

and/or the presence of a gas in the gas,

15. the method of claim 8, wherein,

And/or the presence of a gas in the gas,

16. the method of claim 1,

Controlling the saturation temperature corresponding to the condensing pressure of the air conditioning system, further comprising:

After the saturation temperature corresponding to the control of the condensing pressure is lowered,

If the difference value is recovered to be smaller than the lower limit of the third set threshold range, controlling the saturation temperature corresponding to the condensation pressure to recover to the fourth set value;

Wherein the content of the first and second substances,

the third set threshold range includes: -2 ℃ to 0.

17. the method according to any one of claims 3-5, 7, 9, 10, 11, 12, 14, 15,

Wherein the content of the first and second substances,

the third set threshold range includes: -2 ℃ to 0.

18. the method of claim 13,

wherein the content of the first and second substances,

the third set threshold range includes: -2 ℃ to 0.

19. a control device of an air conditioning system, characterized by comprising:

The system comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring the indoor environment temperature and the user set temperature of the air conditioning system and also used for acquiring the outdoor environment temperature of the air conditioning system;

A determination unit for determining a difference between the indoor ambient temperature and the user set temperature;

the control unit is used for controlling the saturation temperature corresponding to the evaporation pressure or the condensation pressure of the air conditioning system according to the operation mode of the air conditioning system and the difference value, and comprises the following components:

when the operation mode is a cooling mode, controlling a saturation temperature corresponding to the evaporation pressure of the air conditioning system according to the outdoor environment temperature and the difference, specifically comprising:

when the operation mode is a heating mode, controlling the protection temperature corresponding to the condensing pressure of the air conditioning system according to the difference, specifically comprising:

20. The apparatus of claim 19, wherein the operational mode comprises: a cooling mode or a heating mode;

The control unit controls the saturation temperature corresponding to the evaporation pressure or the condensation pressure of the air conditioning system, and the control unit specifically comprises:

21. The apparatus according to claim 19, wherein the control unit controls the saturation temperature increase corresponding to the evaporation pressure, and specifically comprises:

22. the apparatus according to claim 21, wherein the control unit controls the saturation temperature corresponding to the evaporation pressure to increase by a first set temperature, and specifically comprises:

23. The apparatus of claim 19, wherein,

The control unit controls the saturation temperature corresponding to the evaporation pressure to be a first set value and/or controls the saturation temperature corresponding to the evaporation pressure to be a third set value, and the control method specifically includes:

And/or the presence of a gas in the gas,

the control unit controls the saturation temperature increase corresponding to the evaporation pressure, and specifically comprises:

And/or the presence of a gas in the gas,

the control unit enables the saturation temperature corresponding to the evaporation pressure not to exceed a second set value, and specifically comprises:

24. The apparatus of claim 21 or 22, wherein,

And/or the presence of a gas in the gas,

and/or the presence of a gas in the gas,

25. the apparatus of claim 19,

The control unit control the saturation temperature that air conditioning system's evaporating pressure corresponds specifically still includes:

wherein the content of the first and second substances,

the second set threshold range includes: 0 to 3 ℃.

26. The apparatus according to one of claims 21 to 23,

wherein the content of the first and second substances,

the second set threshold range includes: 0 to 3 ℃.

27. the apparatus of claim 24,

wherein the content of the first and second substances,

The second set threshold range includes: 0 to 3 ℃.

28. The apparatus according to claim 19, wherein the control unit controls the saturation temperature reduction corresponding to the condensing pressure, and specifically comprises:

29. The apparatus according to claim 28, wherein the control unit controls the saturation temperature corresponding to the condensing pressure to decrease by a second set temperature, specifically comprising:

30. The apparatus of claim 19, wherein,

The control unit controls the saturation temperature corresponding to the condensing pressure of the air conditioning system to be a fourth set value, and the control unit specifically comprises:

And/or the presence of a gas in the gas,

the control unit controls the saturation temperature reduction corresponding to the condensing pressure, and specifically comprises:

and/or the presence of a gas in the gas,

the control unit enables the saturation temperature corresponding to the condensing pressure not to be lower than a fifth set value, and the control unit specifically comprises the following steps:

31. the apparatus of any one of claims 21-23, 25, 27-29, wherein,

and/or the presence of a gas in the gas,

And/or the presence of a gas in the gas,

32. The apparatus of claim 24, wherein,

and/or the presence of a gas in the gas,

And/or the presence of a gas in the gas,

33. the apparatus of claim 26, wherein,

and/or the presence of a gas in the gas,

34. The apparatus of claim 19,

the control unit control the saturation temperature that air conditioning system's condensing pressure corresponds specifically still includes:

Wherein the content of the first and second substances,

The third set threshold range includes: -2 ℃ to 0.

35. The apparatus of any one of claims 21-23, 25, 27-29, 30, 32, 33,

wherein the content of the first and second substances,

the third set threshold range includes: -2 ℃ to 0.

36. The apparatus of claim 31,

wherein the content of the first and second substances,

The third set threshold range includes: -2 ℃ to 0.

37. an air conditioning system, comprising: a control apparatus for an air conditioning system as claimed in any one of claims 19 to 36.