CN110285535B - Enthalpy increasing control method and device for air conditioning system - Google Patents
Enthalpy increasing control method and device for air conditioning system Download PDFInfo
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- CN110285535B CN110285535B CN201910551351.4A CN201910551351A CN110285535B CN 110285535 B CN110285535 B CN 110285535B CN 201910551351 A CN201910551351 A CN 201910551351A CN 110285535 B CN110285535 B CN 110285535B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
Abstract
The invention discloses an enthalpy-increasing control method and device. The method comprises the following steps: judging whether the current environmental parameters meet preset conditions or not; if the preset condition is met, judging whether the current enthalpy-increasing superheat degree Ts' is not less than the target enthalpy-increasing superheat degree Ts; if the current enthalpy-increasing superheat degree Ts' is not less than the target enthalpy-increasing superheat degree Ts, judging whether the high-pressure side pressure Ph of the air-conditioning system is not more than the target pressure P; and if the high-pressure side pressure Ph of the air conditioning system is less than or equal to the target pressure P, starting the enthalpy increasing function of the air conditioning system. Through the technical scheme, the enthalpy-increasing opening condition is more reasonable, and the condition that the compressor stops working due to instantaneous reduction of bus voltage caused by enthalpy increase can be effectively avoided.
Description
Technical Field
The embodiment of the invention relates to the technical field of electrical control, in particular to an enthalpy increasing control method and device of an air conditioning system.
Background
Along with the development of air conditioning systems, the enthalpy increasing system is added to more and more air conditioning systems to meet the market demand. By adding the enthalpy increasing system, the air conditioning system can improve the low-temperature heating capacity and the high-temperature refrigerating capacity.
In the prior art, a timed starting enthalpy increase mode is generally adopted, for example, the starting enthalpy increase mode can be set to start after one minute of starting. The enthalpy is increased by starting suddenly, because the power cannot change instantly when the load of the system increases suddenly, but the current increases suddenly (because the load increases suddenly, the compressor needs to overcome larger resistance to do work, the current increases to increase the torque of the compressor), namely, P is unchanged, I is increased, U is reduced, the condition that the bus voltage drops due to the load increases suddenly occurs, the compressor is stopped suddenly, and the compressor enters a shutdown protection state. The normal operation of the air conditioning system is influenced, and the damage of the compressor is easily caused.
Based on the above, a solution capable of performing stable enthalpy-increasing control on the air conditioning system is needed.
Disclosure of Invention
In order to solve the above problems, embodiments of the present invention provide an enthalpy-increasing control method and apparatus, which are used to perform stable enthalpy-increasing control on an air conditioning system.
In a first aspect, an embodiment of the present invention provides an enthalpy-increasing control method for an air conditioning system, where an enthalpy-increasing function of the air conditioning system can only be started when at least the following preset enthalpy-increasing start conditions are met:
s11, the current environmental temperature T is less than or equal to the critical environmental temperature TE；
S12, the current enthalpy-increasing superheat degree Ts' is ≧ target enthalpy-increasing superheat degree Ts;
s13, the high-pressure side pressure Ph of the air conditioning system is less than or equal to the target pressure P;
otherwise, the enthalpy increasing function is not started.
In a second aspect, an embodiment of the present invention provides another enthalpy-increasing control method for an air conditioning system, where the control method includes:
s21: judging whether the current environmental parameters meet preset conditions or not;
s22: if the preset condition is met, judging whether the current enthalpy-increasing superheat degree Ts' is not less than the target enthalpy-increasing superheat degree Ts;
s23: if the current enthalpy-increasing superheat degree Ts' is not less than the target enthalpy-increasing superheat degree Ts, judging whether the high-pressure side pressure Ph of the air-conditioning system is not more than the target pressure P;
s24: and if the high-pressure side pressure Ph of the air conditioning system is less than or equal to the target pressure P, starting the enthalpy increasing function of the air conditioning system.
Further, the current environmental parameter includes an environmental temperature T, and if the current environmental parameter satisfies a preset condition, the current environmental temperature T is required to be ≦ the critical environmental temperature TE。
Further, the current environmental parameter includes an environmental temperature T, and if the current environmental temperature T is>Critical ambient temperature TEThe air conditioning system does not start the enthalpy increasing function.
Further, the parameter detection in the step of determining at S21 needs to be continuously detected within a first set time period.
Further, the parameter detection in the step of determining at S22 needs to be continuously detected within a second set time period.
Further, the parameter detection in the step of determining in S23 needs to be continuously detected within a third set time period.
Further, if the step S22 is no, the enthalpy increasing function is not activated.
Further, if the step S23 is no, the enthalpy increasing function is not activated.
Further, if the step S24 is no, the enthalpy increasing function is not activated.
And further, after the enthalpy increasing function of the air conditioning system is started, the operation is carried out for about 15min, and the judgment of the steps S21-S24 is continued.
Further, the judgment of the steps S21-S24 is continued after the air conditioning system is started to increase the enthalpy function or is not started to increase the enthalpy and operates for a preset time period.
Further, the system high-side pressure is a compressor discharge side pressure; the target pressure is the highest high pressure allowed by enthalpy increase; the critical ambient temperature TE＝20℃。
Further, the operation mode of the air conditioning system without starting the enthalpy increasing function is ordinary operation.
In a third aspect, an embodiment of the present invention provides an enthalpy-increasing control apparatus for an air conditioning system, the apparatus including: the device comprises a detection module and a judgment module;
the detection module is used for acquiring the current environment temperature, the enthalpy-increasing superheat degree and the system high-pressure side pressure;
the judging module is used for judging whether the current operating parameters of the air conditioning system meet the preset enthalpy-increasing starting conditions:
s11, the current environmental temperature T is less than or equal to the critical environmental temperature TE；
S12, the current enthalpy-increasing superheat degree Ts' is ≧ target enthalpy-increasing superheat degree Ts;
s13, the high-pressure side pressure Ph of the air conditioning system is less than or equal to the target pressure P;
after the air conditioner is started, the enthalpy increasing function of the air conditioning system can be started only if the three conditions are met.
In the embodiment of the invention, whether the enthalpy increasing function is started or not is determined by detecting and judging the current environment temperature, the current enthalpy increasing superheat degree and the current air conditioning system high-pressure side pressure. Through the technical scheme, the enthalpy-increasing opening condition is more reasonable, and the phenomenon that the compressor stops working due to instantaneous reduction of bus voltage caused by enthalpy increase can be effectively avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of an air conditioning system with an enthalpy increasing function according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of an air conditioning system with an enthalpy increasing function according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart illustrating an enthalpy-increasing control method for an air conditioning system according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating another enthalpy-increasing control method for an air conditioning system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present 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.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and "a" and "an" generally include at least two, but do not exclude at least one, unless the context clearly dictates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.
In the control scheme of the enthalpy-increasing system in the prior art, the enthalpy-increasing starting condition is usually started by setting fixed time, and under the condition that the enthalpy-increasing instantaneous enthalpy superheat degree is insufficient, a large amount of liquid refrigerant is sucked by a compressor, so that the compressor is subjected to liquid impact, the load of the system is suddenly increased, and the bus voltage is instantaneously reduced, so that the compressor is stopped. The normal operation of the air conditioning system is influenced, the use experience of a user is influenced, and the compressor is easy to damage when being started and stopped frequently. In order to enable enthalpy increase control of the air conditioning system to be more stable, whether enthalpy increase needs to be started or not can be determined by comprehensively judging conditions such as temperature, pressure and the like.
For example, fig. 1 shows a diagram of an air conditioning system with an enthalpy increasing function, and exemplary description is given to system components and implementation modes.
The first circulation loop flows to: compressor 12 → condenser side heat exchanger 10 → capillary tube 17 → flash evaporator 15 → electronic expansion valve 18 → evaporator side heat exchanger 19 → compressor 12; the second circulation loop flows to: compressor 12 → condenser-side heat exchanger 10 → capillary tube 17 → flash evaporator 15 → enthalpy addition control switch 13 → compressor 12. Enthalpy increasing circulation: performing both the first and second circulation loop flow directions, normal circulation (no enthalpy addition on): only the first circulation loop flow direction is performed. Wherein, a high pressure sensor 11 for detecting the pressure of the compressor is also arranged between the condensation side heat exchanger 10 and the compressor 12; an enthalpy-increasing pressure sensor 14 is also arranged on a passage between the compressor 12 and the flash evaporator 15; a flash evaporator inlet pipe sensor 16 is also arranged between the capillary 17 and the flash evaporator 15; an electronic expansion valve 18 is also arranged between the flash evaporator 15 and the evaporation side heat exchanger 19; an ambient temperature sensor 20 is also provided on the evaporation side heat exchanger 19.
For ease of understanding, the enthalpy-increasing operation of the air conditioning system is illustrated below, as shown in the flow diagram of fig. 2.
First, a: the unit starts the air conditioning system through a manual operator or a remote controller; b: t ≦ T detected when "consecutive T min (e.g., T ≦ 3min) is not satisfiedE(e.g., T)E20 ℃), the enthalpy increasing control switch is turned off, and the circulation of the refrigerant performs "normal circulation" (i.e., normal circulation is performed by the first circulation circuit); c: t ≦ T detected when "continuous T time (e.g., T ≦ 3min) is satisfiedE(e.g., T)E20 ℃), ": c 1: if the't time of continuous detection Ts ' is not satisfied to be more than or equal to Ts ', the enthalpy-increasing control switch is closed, and ' ordinary circulation ' is executed (namely, the ordinary circulation is executed through the first circulation loop); c 2: if the continuous detection t time Ts 'is more than or equal to Ts', the following judgment is continuously carried out: d 1: when the high pressure is higher than P, namely Ph is more than P, the enthalpy-increasing control switch is turned off, and a 'common cycle' is executed; d 2: when the high pressure is not higher than P, namely Ph is not more than P, the enthalpy increasing control switch is switched on, one path of refrigerant executes the flow direction of the first circulation loop, the other path of refrigerant executes the flow direction of the second circulation loop, and the refrigerant directly returns to the compressor through the enthalpy increasing control switch to increase the enthalpy. e: and (4) after the unit runs for t1 time (for example, t1 is 15min), the steps b to d are executed again for judgment, and the operation is repeated in a circulating mode. In the embodiment of the application, the operation mode that the air conditioning system does not start the enthalpy increasing function can be understood as normal operation, and only the first circulation loop is started to execute normal circulation.
Fig. 3 is a flowchart illustrating an enthalpy-increasing control method for an air conditioning system according to an embodiment of the present invention, where an execution main body of the method may be a control unit (e.g., a control unit such as a single chip microcomputer or an MCU) in the air conditioning system. As shown in fig. 3, the air conditioning system can be activated to increase enthalpy when at least the following preset enthalpy-increasing start conditions are satisfied:
s11, the current environmental temperature T is less than or equal to the critical environmental temperature TE；
S12, the current enthalpy-increasing superheat degree Ts' is ≧ target enthalpy-increasing superheat degree Ts;
s13, the high-pressure side pressure Ph of the air conditioning system is less than or equal to the target pressure P;
otherwise, the enthalpy increasing function is not started.
In practical applications, before step S11 is executed, the air conditioner needs to be turned on (turning on the air conditioner), for example, the air conditioner is turned on by a remote controller, so that the air conditioner enters a normal operating state. The steps can be applied to the low-temperature heating enthalpy-increasing process. Similarly, in the process of enthalpy increase of high-temperature refrigeration, if the enthalpy increase function is started, the current environment temperature T is required to be more than or equal to the critical environment temperature TE(ii) a The current enthalpy-increasing superheat degree Ts' is larger than or equal to the target enthalpy-increasing superheat degree Ts; the high-pressure side pressure Ph of the air conditioning system is less than or equal to the target pressure P. The specific temperature value and the pressure value can be set according to the actual situation.
Based on the same idea, an embodiment of the present invention further provides another enthalpy-increasing control method for an air conditioning system, where the control method is shown in flowchart 4, and the specific steps may include:
s21: judging whether the current environmental parameters meet preset conditions or not;
s22: if the preset condition is met, judging whether the current enthalpy-increasing superheat degree Ts' is not less than the target enthalpy-increasing superheat degree Ts;
s23: if the current enthalpy-increasing superheat degree Ts' is not less than the target enthalpy-increasing superheat degree Ts, judging whether the high-pressure side pressure Ph of the air-conditioning system is not more than the target pressure P;
s24: and if the high-pressure side pressure Ph of the air conditioning system is less than or equal to the target pressure P, starting the enthalpy increasing function of the air conditioning system.
The enthalpy increasing mode of the air conditioning system can be applied to low-temperature heating enthalpy increase and high-temperature cooling enthalpy increase. In practical application, in a low-temperature heating application scene, the ambient temperature of the outdoor unit of the air conditioner is higherAnd the enthalpy increasing control scheme can obtain better low-temperature heating effect. For convenience of understanding, the present embodiment will be described by taking enthalpy addition control in the case of low-temperature heating as an example. For example, after power-on, the current ambient temperature T is collected by an ambient temperature sensor. Further, the current ambient temperature T is compared with a preset critical ambient temperature TEComparing, and finding that the current environment temperature T is greater than the critical environment temperature TEThen the enthalpy increase is not needed to be started; if the current environmental temperature T is less than or equal to the critical environmental temperature T after comparisonEAnd further acquiring the current enthalpy-increasing superheat degree Ts'.
Further, the obtained current enthalpy-increasing superheat degree Ts 'is compared with a preset target enthalpy-increasing superheat degree Ts (the target enthalpy-increasing superheat degree can be set according to experiments or practical application conditions), and if the current enthalpy-increasing superheat degree Ts' is smaller than the target enthalpy-increasing superheat degree Ts, enthalpy increasing is not started temporarily, so that liquid impact of the compressor caused by the fact that the compressor sucks a large amount of liquid refrigerant can be prevented.
Further, if the current enthalpy-increasing superheat degree Ts' is smaller than the target enthalpy-increasing superheat degree Ts, the pressure Ph of the high-pressure side of the current air-conditioning system is further compared with the target pressure P. If the high-pressure side pressure Ph of the air conditioning system is greater than the target pressure P, starting the enthalpy increasing function; and if the high-pressure side pressure Ph of the air conditioning system is less than or equal to the target pressure P, the enthalpy increasing function is not started, and the condition of high-pressure shutdown protection of the compressor is prevented from being triggered to cause the overpressure shutdown of the compressor. Through the scheme, stable low-temperature enthalpy-increasing control can be realized, the bus voltage cannot be influenced, and the problem of shutdown caused by compressor liquid impact or compressor high-voltage protection and the like is avoided.
In one or more embodiments of the present invention, the parameter detection in the step of determining S21 needs to be continuously detected within a first set time period. In practical application, due to the influence of the ambient temperature, the influence of the sensitivity of the temperature sensor and the like, the obtained current enthalpy-increasing superheat degree fluctuates in a small range. In order to ensure the reliability of the obtained current enthalpy-increasing superheat degree and ensure the stability of the enthalpy-increasing control system, the current enthalpy-increasing superheat degree can be judged whether to be higher than or lower than the target enthalpy-increasing superheat degree after monitoring the continuous enthalpy-increasing superheat degree for a period of time (a first set time length). For example, the sampling frequency is 60HZ, the current enthalpy-increasing superheat degree of one minute is continuously detected, then the current enthalpy-increasing superheat degree acquired each time is compared with the target enthalpy-increasing superheat degree, and if all the current enthalpy-increasing superheat degrees are higher than the target enthalpy-increasing superheat degree, the enthalpy-increasing control switch is closed; and if the current enthalpy-increasing superheat degree is not higher than the target enthalpy-increasing superheat degree, maintaining the enthalpy-increasing control switch in the original state. Of course, the continuously detected current enthalpy-increased superheat degree can be averaged, and the average value can be compared with the target enthalpy-increased superheat degree. The enthalpy-increasing control switch is maintained in an original state, and it is understood that the enthalpy-increasing control switch is maintained in an open state when it is originally in the open state, and is maintained in an off state when it is considered that it is originally in the off state. By the technical scheme of the embodiment, the reliability of the obtained current enthalpy-increasing superheat degree can be ensured.
In one or more embodiments of the present invention, the parameter detection in the step of determining at S22 needs to be continuously detected within a second set time period; the parameter detection in the judgment step of S23 needs to be continuously detected for the third set time period. It should be noted that the first set time length, the second set time length, and the third set time length are different expressions of time lengths used in different determination situations, and the first set time length and the second set time length may represent the same time length or different time lengths, and may be specifically determined according to the actual application situation. The conditions for determining the opening of the enthalpy-increasing control switch in this embodiment are similar to the conditions for determining the closing of the enthalpy-increasing control switch in the above embodiments, and the description thereof is not repeated. By the technical scheme of the embodiment, the reliability of the obtained current enthalpy-increasing superheat degree can be ensured
In one or more embodiments of the invention, the air conditioning system enthalpy increasing function is started and then the operation is continued for about 15min, and the judgment of the steps S21-S24 is continued. In practical application, when a user starts the air conditioner, the user usually needs to operate each component and sensor in the air conditioning system normally and stably to further judge whether to start the enthalpy increasing function. Avoid opening increase enthalpy with trade and lead to the system can not work steadily.
In one or more embodiments of the present invention, the determination of steps S21-S24 is continued after the air conditioning system is activated or not activated for increasing enthalpy for a preset time period.
In one or more embodiments of the invention, the system high side pressure is the compressor discharge side pressure; the target pressure is the highest allowable enthalpy increase pressure; critical ambient temperature TE＝20℃。
Based on the same idea, an embodiment of the present invention further provides an enthalpy-increasing control device for an air conditioning system, where the enthalpy-increasing control device includes: the device comprises a detection module and a judgment module;
the detection module is used for acquiring the current environment temperature, the enthalpy-increasing superheat degree and the system high-pressure side pressure;
the judging module is used for judging whether the current operating parameters of the air conditioning system meet the preset enthalpy-increasing starting conditions:
s11, the current environmental temperature T is less than or equal to the critical environmental temperature TE；
S12, the current enthalpy-increasing superheat degree Ts' is ≧ target enthalpy-increasing superheat degree Ts;
s13, the high-pressure side pressure Ph of the air conditioning system is less than or equal to the target pressure P;
after the air conditioner is started, the enthalpy increasing function of the air conditioning system can be started only if the three conditions are met. In other words, the enthalpy-increasing control switch 13 is turned on only when the above three conditions are satisfied.
It should be noted that the current enthalpy-increasing superheat degree can be directly obtained through a temperature sensor, and can also be indirectly obtained through a sensor. Specifically, if the indirect acquisition mode is adopted, the flash evaporator inlet pipe temperature can be acquired by providing the flash evaporator inlet pipe sensor 16 at the inlet pipe end of the flash evaporator 15. And then obtaining the preset enthalpy-increasing saturation temperature. And taking the difference value of the temperature of the inlet pipe of the flash evaporator and the preset enthalpy-increasing saturation temperature as the current enthalpy-increasing superheat degree. Can be expressed by the formula: and Ts 'is Tp-Tj, wherein Ts' represents the current enthalpy-increasing superheat degree, Tp represents the preset enthalpy-increasing saturation temperature, and Tj represents the flash evaporator inlet pipe temperature. In practical applications, the current enthalpy-increasing superheat degree may be a real-time temperature at the current judgment time or an average temperature over a period of time.
Further, the parameter detection in the judgment step of S11 needs to be continuously detected within the first set time period.
Further, the parameter detection in the judgment step of S12 needs to be continuously detected within the second set time period.
Further, the parameter detection in the judgment step of S13 needs to be continuously detected for the third set time period.
Further, if any of the steps S11-S13 is NO, the enthalpy increasing function is not started.
And further, after the enthalpy increasing function of the air conditioning system is started, the operation is carried out for about 15min, and the judgment of the steps S21-S24 is continued.
Further, the judgment of the steps S11-S13 is continued after the air conditioning system is started to increase the enthalpy function or is not started to increase the enthalpy and operates for a preset time period.
Further, the system high-pressure side pressure is the compressor discharge side pressure; the target pressure is the highest high pressure allowed by enthalpy increase; critical ambient temperature TE＝20℃。
Further, the operation mode of the air conditioning system without starting the enthalpy increasing function is ordinary operation.
Through the embodiment, whether the enthalpy increasing function is started or not is determined through detection and judgment of the current environment temperature, detection and judgment of the current enthalpy increasing superheat degree and detection and judgment of the current high-pressure side pressure of the air conditioning system. Through the technical scheme, the enthalpy-increasing opening condition is more reasonable, and the phenomenon that the compressor stops working due to instantaneous reduction of bus voltage caused by enthalpy increase can be effectively avoided.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (14)
1. An enthalpy addition control method of an air conditioning system, characterized by comprising:
s21: judging whether the current environmental parameters meet preset conditions or not;
s22: if the preset condition is met, judging whether the current enthalpy-increasing superheat degree Ts' is not less than the target enthalpy-increasing superheat degree Ts;
s23: if the current enthalpy-increasing superheat degree Ts' is not less than the target enthalpy-increasing superheat degree Ts, judging whether the high-pressure side pressure Ph of the air-conditioning system is not more than the target pressure P;
s24: if the pressure Ph at the high-pressure side of the air conditioning system is less than or equal to the target pressure P, starting an enthalpy increasing function of the air conditioning system;
the air conditioning system comprises a flash evaporator, wherein a flash evaporator inlet pipe sensor is arranged at the inlet pipe end of the flash evaporator, the flash evaporator inlet pipe sensor acquires the inlet pipe temperature of the flash evaporator, and the difference value between the preset enthalpy-increasing saturation temperature and the inlet pipe temperature of the flash evaporator is used as the current enthalpy-increasing superheat degree, namely: and Ts 'is Tp-Tj, wherein Ts' represents the current enthalpy-increasing superheat degree, Tp represents the preset enthalpy-increasing saturation temperature, and Tj represents the flash evaporator inlet pipe temperature.
2. The enthalpy-increasing control method according to claim 1, wherein the current environmental parameter includes an environmental temperature T, and if the current environmental parameter satisfies a preset condition, the current environmental temperature T ≦ the critical environmental temperature TE。
3. Enthalpy-addition control method according to claim 2, characterized in that the current environmental parameter includes an ambient temperature T, if the current ambient temperature T is>Critical ambient temperature TEThe air conditioning system does not start the enthalpy increasing function.
4. An enthalpy increasing control method according to any one of claims 1 to 3, wherein the parameter detection in the judgment step of S21 is continuously detected for a first set time period.
5. An enthalpy adding control method according to any one of claims 1 to 3, wherein the parameter detection in the judgment step of S22 is continuously detected for a second set time period.
6. An enthalpy adding control method according to any one of claims 1 to 3, wherein the parameter detection in the judgment step of S23 is continuously detected for a third set time period.
7. The enthalpy-increasing control method according to any one of claims 1 to 3, wherein the step S22 is NO, and the enthalpy-increasing function is not activated.
8. The enthalpy-increasing control method according to any one of claims 1 to 3, wherein the step S23 is NO, and the enthalpy-increasing function is not activated.
9. The enthalpy-increasing control method according to any one of claims 1 to 3, wherein the step S24 is NO, and the enthalpy-increasing function is not activated.
10. The enthalpy increasing control method according to any one of claims 1 to 3, wherein the operation is continued for about 15min after the enthalpy increasing function of the air conditioning system is activated, and the judgment of the steps S21 to S24 is continued.
11. The enthalpy increasing control method according to any one of claims 1 to 3, wherein the judgment of the steps S21 to S24 is continued after the air conditioning system is activated or not activated for the enthalpy increasing function for a preset time period.
12. The enthalpy-addition control method according to any one of claims 1 to 3, wherein the system high-side pressure is a compressor discharge side pressure; the target pressure is the highest high pressure allowed by enthalpy increase; the critical ambient temperature TE＝20℃。
13. The enthalpy-increasing control method according to any one of claims 1 to 3, wherein an operation mode in which the enthalpy-increasing function of the air conditioning system is not activated is a normal operation.
14. An enthalpy-increasing control apparatus of an air conditioning system using the enthalpy-increasing control method according to any one of claims 1 to 13, the apparatus comprising: the device comprises a detection module and a judgment module;
the detection module is used for acquiring the current environment temperature, the enthalpy-increasing superheat degree and the system high-pressure side pressure;
and the judging module is used for judging whether the current operating parameters of the air conditioning system meet the preset enthalpy-increasing starting conditions.
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