Compressor and fluorine pump dual-energy driving control method and system based on ambient temperature identification

Abstract

The present application relates to the technical field of compressor drive control, and more particularly to a compressor and fluorine pump dual-energy drive control method and system based on environmental temperature identification, which takes environmental temperature and system internal refrigerant state as joint control basis, constructs a quantifiable temperature drive capability index, introduces a building heat response model and heat capacity parameter, and establishes a dynamic compressor intervention judgment mechanism; when fluorine pump refrigeration capacity decreases or building heat inertia cannot maintain target cold quantity, the compressor intervention urgency index is calculated to realize adaptive control of compressor advance or delay start; in the drive control decision, environmental temperature segmented logic and system state quantification results are fused, a drive mode priority index is constructed through a nonlinear weight function and an inertia suppression term, continuous switching control of the fluorine pump and the compressor in different environmental intervals is realized, and frequent switching and control oscillation in critical point working conditions are effectively avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressor driving control, and in particular to a compressor and fluorine pump dual-energy driving control method and system based on environmental temperature identification. BACKGROUND

[0002] At present, as a high-efficiency and energy-saving cold and heat supply system, an air source heat pump has been widely used in building air conditioning, commercial refrigeration and hot water systems, and its operation mainly relies on a compressor driving refrigeration cycle to realize heat transfer, and has strong applicability.

[0003] However, in long-term operation, the conventional system generally has problems of low energy utilization rate, frequent start-stop of equipment and single control mode. The conventional heat pump system only relies on the compressor for refrigeration, and even in the seasonal operating conditions with natural cold source conditions (for example, in the spring and autumn or low temperature period at night), the system still adopts the compressor forced operation, causing additional energy waste and mechanical wear. At the same time, since the compressor has low operating efficiency under low load conditions, the system has a significant decrease in the coefficient of performance (COP) when maintaining light load operation for a long time, and frequent start-stop accelerates mechanical fatigue and shortens the service life of the equipment. In view of these problems, some systems attempt to realize energy saving by configuring a natural cooling heat exchange device or using frequency conversion control, but these methods often rely on fixed threshold switching logic and lack comprehensive sensing ability for system operating state, environmental changes and building load response. At the temperature critical point, such systems are prone to oscillatory switching of the compressor and auxiliary equipment, resulting in refrigeration fluctuations, increased energy consumption and decreased comfort. In addition, the existing control methods often ignore the buffering effect of the thermal inertia of the building on the change of the cooling load, so as to accurately evaluate the intervention time of the equipment, and finally make the system adjust lag or energy scheduling imbalance under part of the load conditions.

[0004] Therefore, there is an urgent need for a dynamic control strategy that can comprehensively consider the environmental temperature, refrigerant thermodynamic state and building thermal response characteristics, to realize the coordinated scheduling of the compressor and the fluorine pump under different operating conditions, so as to balance the energy efficiency improvement, equipment life extension and operation stability. SUMMARY

[0005] In view of the above problems, the present application provides a compressor and fluorine pump dual-energy driving control method and system based on environmental temperature identification. In order to achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0006] In one aspect, a compressor and fluorine pump dual-energy driving control method based on environmental temperature identification is provided, comprising the following steps:

[0007] The ability index of the fluorine pump independently undertaking the refrigeration task under the current ambient temperature is calculated by collecting the ambient temperature, the refrigerant saturation temperature and the condenser outlet temperature, and the refrigerant saturation temperature is obtained by collecting the refrigerant pressure through the low-pressure side pressure sensor and looking up the table; the ability index is used to determine whether the fluorine pump has the ability to independently complete the refrigeration cycle under the current working condition, and when the ability index is greater than the preset threshold, no action is needed, and when the ability index is less than the preset threshold, it indicates that the compressor needs to be involved;

[0008] In the state where the compressor needs to be involved, a cooling balance state index is calculated by collecting the ability index, the indoor temperature change rate and the building equivalent heat capacity, which is used to quantify the urgency of the compressor intervention, and the building equivalent heat capacity is determined by energy consumption test or simulation model in the debugging stage; when the cooling balance state index is less than the preset value, the compressor does not need to be started, and when the cooling balance state index is greater than or equal to the preset value, the mixed drive or the compressor alone is triggered to run;

[0009] According to the ability index and the cooling balance state index, a control index is calculated by a control scoring function, which is used to generate the driving mode that the system should adopt at the current time, and the driving mode includes starting the fluorine pump only, mixed running of the fluorine pump and the compressor, and starting the compressor only;

[0010] The control scoring function includes an ambient temperature paragraph guide item and a driving mode switching inertia damping item;

[0011] The ambient temperature paragraph guide item is used to strengthen the influence of environmental factors on the control strategy, and the driving mode switching inertia damping item is used to solve the problem that the double-energy drive frequently switches in the critical area of ambient temperature, resulting in frequent start-stop of the compressor;

[0012] The driving mode is mapped from the control index , and the mapping relationship is as follows:

[0013] If , then , start the fluorine pump only, and stop the compressor;

[0014] If , then , run the fluorine pump and the compressor in double drive;

[0015] If , then , stop the fluorine pump and start the compressor only;

[0016] Wherein, and are the threshold values of the control interval, represents the driving mode, F represents starting the fluorine pump, represents starting the compressor, Indicates that the fluorine pump and the compressor double drive mixed operation.

[0017] As preferred, the condenser outlet temperature is collected by K-type thermocouple attached to the surface of the copper pipe; the refrigerant saturation temperature is collected by the low-pressure side pressure sensor collecting the refrigerant pressure and looking up the table; and the ambient temperature is collected by the digital temperature sensor arranged at the air outlet of the equipment shell.

[0018] As preferred, in the capacity index calculation process, an empirical coefficient obtained through working condition calibration during debugging is introduced to suppress the low-temperature amplification effect and control the temperature sensitivity of the index change, enhance the dynamic compensation of the ambient temperature on the cold source efficiency, and suppress the overly optimistic judgment of the fluorine pump at high temperature and improve the judgment reliability at low temperature.

[0019] As preferred, in the cooling balance state index calculation process, a regular correction term is introduced to make the regular correction term approach to zero when the fluorine pump refrigeration effect is good, so that the compressor is not started early; when the fluorine pump refrigeration effect is poor, the system response to fluorine pump failure becomes more sensitive through correction, and the mixed drive or compressor alone is triggered early.

[0020] More preferably, a dynamic adjustment mechanism is introduced: if the number of compressor interventions is higher than expected after the system runs for a period of time, i.e. the number of interventions in the preset period exceeds the intervention threshold, the regular correction term is reduced, thereby increasing the delay tolerance of the system.

[0021] As preferred, the compressor intervention signal is output based on the cooling balance state index result, specifically:

[0022] When the cooling balance state index is less than the preset value, the compressor does not need to be started, and the fluorine pump continues to run alone; when the cooling balance state index is greater than or equal to the preset value, the controller immediately sends a compressor start signal to trigger the mixed drive or compressor alone.

[0023] In another aspect of the present application, a compressor and fluorine pump dual-energy drive control system based on ambient temperature identification is provided, comprising sequentially connected:

[0024] A fluorine pump refrigeration capacity judgment module is used to collect the ambient temperature, the refrigerant saturation temperature and the condenser outlet temperature, calculate the capacity index of the fluorine pump to independently undertake the refrigeration task under the current ambient temperature, and the refrigerant saturation temperature is obtained by collecting the refrigerant pressure through the low-pressure side pressure sensor and looking up the table; the capacity index is used to judge whether the fluorine pump has the ability to independently complete the refrigeration cycle under the current working condition, and when the capacity index is greater than the preset threshold, no action is needed, and when the capacity index is less than the preset threshold, the compressor needs to be intervened;

[0025] A dynamic evaluation module is configured to calculate a cooling balance state index by the capacity index, the indoor temperature change rate and the building equivalent heat capacity in a state requiring compressor intervention, the building equivalent heat capacity being determined by energy consumption testing or a simulation model in a debugging stage, the cooling balance state index being used to quantify the urgency of compressor intervention, the compressor is not started when the cooling balance state index is less than a preset value, and the mixed drive or compressor alone is triggered when the cooling balance state index is greater than or equal to the preset value.

[0026] A drive output mode guiding module is configured to calculate a control index by a control scoring function according to the capacity index and the cooling balance state index, the control index being used to generate a drive mode to be adopted by the system at the current time, the drive mode including starting only the fluorine pump, the fluorine pump and the compressor dual-drive mixed operation and starting only the compressor.

[0027] The control scoring function includes an ambient temperature paragraph guiding item and a drive mode switching inertia damping item.

[0028] The ambient temperature paragraph guiding item is used to strengthen the influence of environmental factors on the control strategy, and the drive mode switching inertia damping item is used to solve the problem that the dual-energy drive frequently switches in the critical zone of the ambient temperature, resulting in frequent start-stop of the compressor.

[0029] The drive mode is mapped from the control index, and the mapping relationship is as follows:

[0030] If , then , only the fluorine pump is started, and the compressor is stopped.

[0031] If , then , the fluorine pump and the compressor dual-drive mixed operation is performed.

[0032] If , then , the fluorine pump is stopped, and only the compressor is started.

[0033] Wherein, and are the demarcation thresholds of the control interval, represents the drive mode, F represents starting the fluorine pump, represents starting the compressor, represents the fluorine pump and the compressor dual-drive mixed operation.

[0034] Compared with the prior art, the present application has the following beneficial effects:

[0035] ​The present application aims at the above-mentioned deficiencies, and proposes a compressor and fluorine pump dual-energy driving control method and system based on environmental temperature identification. The method takes environmental temperature and system internal refrigerant state as the joint control basis, constructs a quantifiable temperature driving capacity index for judging the ability of the fluorine pump to independently undertake the refrigeration task under the current working condition. On this basis, by introducing the building thermal response model and heat capacity parameter, a dynamic compressor intervention judgment mechanism is established to identify the energy balance relationship between the building temperature rise trend and the matching degree of natural cold source. When the fluorine pump refrigeration capacity decreases or the building thermal inertia cannot maintain the target cold quantity, the system realizes the adaptive control of the advance or delay start of the compressor by calculating the compressor intervention urgency index. In addition, the present application first integrates the environmental temperature segmented logic and the system state quantization result in the driving control decision, constructs the driving mode priority index through the nonlinear weight function and the inertia suppression term, realizes the continuous switching control of the fluorine pump and the compressor in different environmental intervals, and effectively avoids the frequent switching and control oscillation in the critical point working condition. Through the three-stage quantitative decision link of fluorine pump driving capacity identification, compressor intervention dynamic evaluation and driving mode nonlinear output, the present application realizes the intelligent adjustment of the dual-energy driving refrigeration system in all working conditions, significantly reduces the system energy consumption, improves the operation stability, prolongs the service life of the compressor and the fluorine pump while maintaining the refrigeration effect, and has significant engineering promotion and energy saving application value. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 The present application is based on the environmental temperature identification of the compressor and the fluorine pump dual-energy driving control method flowchart in the embodiment of the present application.

[0037] Figure 2 The present application is based on the environmental temperature identification of the compressor and the fluorine pump dual-energy driving control system composition block diagram in the embodiment of the present application. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0039] Please refer to Figure 1 The present application proposes a compressor and fluorine pump dual-energy driving control method based on environmental temperature identification, including the following steps:

[0040] Step one: by collecting ambient temperature, refrigerant saturation temperature and condenser outlet temperature, the ability index of fluorine pump to independently undertake refrigeration task under current ambient temperature is calculated, the refrigerant saturation temperature is obtained by collecting refrigerant pressure through low pressure side pressure sensor and table lookup; the ability index is used to judge whether the fluorine pump has the ability to independently complete the refrigeration cycle under the current working condition, when the ability index is greater than the preset threshold, no action is needed, when the ability index is less than the preset threshold, it indicates that the compressor needs to intervene; specifically including:

[0041] This step is used to judge whether the fluorine pump has the ability to independently complete the refrigeration cycle under the current working condition. The fluorine pump relies on natural cold source (i.e. external environment) to complete heat exchange when running, so it is often not accurate to control its start only by fixed temperature threshold. For example, below 7℃, the fluorine pump is used or in some spring nights, although the ambient temperature is lower than the threshold, the humidity is high and the wind speed is low, which reduces the utilization efficiency of natural cold source, if the fluorine pump is still used to run independently at this time, it may cause insufficient refrigeration.

[0042] Therefore, the application introduces a dynamic index "temperature driving ability index" by comprehensively considering external environmental conditions and internal heat exchange effect of the system , to realize real-time quantitative evaluation of the refrigeration capacity of the fluorine pump.

[0043] The data collection required in this step includes two parts. The first part is the ambient temperature , which is collected by a DS18B20 digital temperature sensor arranged at the air inlet of the equipment shell, and the sampling period is set to 5 seconds, and the mean value is updated once a minute. The sensor adopts waterproof packaging and is suitable for complex outdoor working conditions. The second part is the refrigerant supercooling degree , which represents the difference between the actual temperature of the condenser outlet refrigerant and the saturation temperature under the pressure, reflecting the actual heat exchange effect in the cycle driven by the fluorine pump. The condenser outlet temperature is collected by a K-type thermocouple attached to the surface of the copper pipe, and the signal is input to the analog quantity collection channel of the PLC through the conditioning circuit; the refrigerant saturation temperature is obtained by collecting refrigerant pressure through a low pressure side pressure sensor (such as Honeywell PX2 series) and table lookup.

[0044] The refrigerant supercooling degree calculation formula is as follows:

[0045] ;

[0046] Among them, represents the current heat exchange intensity of the system; is the saturation temperature obtained by looking up the refrigerant property table through pressure; is the condenser outlet pipe wall temperature. The greater the supercooling degree, the more sufficient the heat exchange effect of the current fluorine pump drive system, indicating that the external environment and the internal refrigerant circulation match well, and the fluorine pump has a running basis.

[0047] To evaluate the driving capacity of the fluorine pump by combining the ambient temperature with the heat exchange effect, the temperature driving capacity index is further constructed in this step , and the calculation formula is as follows:

[0048] ;

[0049] Among them, represents the ability index of the fluorine pump to independently undertake refrigeration tasks, is the supercooling degree; is the current ambient temperature; and are empirical coefficients obtained through working condition calibration during system debugging, wherein plays a role in suppressing the low-temperature amplification effect, controls the temperature sensitivity of the index change, and the value range is usually about 3.5 and 0.12, respectively. The exponential function part is used to enhance the dynamic compensation of the ambient temperature on the cold source efficiency, and to suppress the fluorine pump judgment that is too optimistic at high temperature, and to improve its judgment credibility at low temperature.

[0050] Taking an actual working condition as an example, assuming that at a certain moment , , the formula is calculated as follows:

[0051] ;

[0052] The index is less than 1, indicating that the fluorine pump heat exchange is acceptable, but it is close to the natural cold source boundary, whether to continue to use the fluorine pump needs to be further judged in combination with the system response ability. The final output of this step is , which is a positive real number and will be used as a core input parameter in the subsequent steps to judge whether the compressor needs to be enabled. By fusing the external natural environment and the refrigerant heat exchange state, this step not only improves the accuracy of the judgment, but also enhances the adaptability of the system in the transition season and variable working conditions.

[0053] Step 2: In the state where the compressor needs to be involved, a cooling balance state index is calculated by the ability index, the indoor temperature change rate and the building equivalent heat capacity, which is used to quantify the urgency of the compressor intervention, and the building equivalent heat capacity is determined by energy consumption test or simulation model during the debugging stage; When the cooling balance state index is less than the preset value, the compressor does not need to be enabled, and when the cooling balance state index is greater than or equal to the preset value, the mixed drive or the compressor alone is triggered, specifically including:

[0054] This step is to obtain the temperature driving capacity index On the basis of the above, further combined with the thermal response characteristics of the building and the system operating load, the urgency of compressor intervention is dynamically evaluated. It is the transition judgment core in the whole control strategy, used to balance the stability and energy efficiency of the system when the fluorine pump capacity gradually approaches the critical point. Compared with the traditional method, this step is not simply to judge "whether the temperature exceeds the threshold value" or "whether the heat exchange capacity is insufficient", but to introduce a dynamic evaluation mechanism based on thermal inertia compensation and system energy change trend, so that the system has the ability to "judge when the compressor is most suitable to intervene" in actual operation.

[0055] Through the temperature-driven capacity index , and the indoor temperature change rate , and the equivalent heat capacity of the building . Among them, The digital temperature probe (such as PT1000) at the main circulating return air inlet of the indoor is collected, with a sampling period of 5 seconds, and is filtered by a sliding window average to exclude transient disturbances. The equivalent heat capacity of the building Is determined by energy consumption test or simulation model during system debugging, which is a fixed value, used to reflect the heat storage characteristics of the building. For example, large office buildings About to , residential buildings are about .

[0056] At the same time, in order to make this step directly dependent on the output results of the previous stage, the control logic adjusts the sensitivity of the building heat capacity to temperature change through , realizing an "energy balance type judgment mechanism", that is, when the fluorine pump capacity is strong, the building temperature rise is weakened, and when the capacity is weak, the temperature rise is amplified.

[0057] The core idea of this step is to use an index that can reflect the overall cooling balance state of the system to describe the urgency of compressor intervention. This index combines the energy accumulation inside the building, the current utilization degree of the cold source, and the dynamic stability of the control system, and its calculation method is as follows:

[0058] ;

[0059] In the formula, is the compressor intervention index, indicating the urgency of the system to start the compressor; is the indoor temperature change rate, whose absolute value represents the strength of the temperature change trend; is the building heat capacity, used to quantify the delay effect of the building on temperature change; is the output value of the previous step, used to reflect the natural cooling capacity of the fluorine pump under the current working condition; and To calibrate the coefficients, the response sensitivity of the control formula to the capacity of the fluorine pump and the temperature change is determined through system experiments, respectively; the second term is the regular correction coefficient, is the empirical set fluorine pump capacity calibration constant. The innovation point of the latter is that it exponentially punishes the decay trend of the fluorine pump capacity: when is high (i.e., the fluorine pump has good refrigeration effect), the term tends to zero, and the system will not start the compressor in advance; when drops to the vicinity of the threshold, the exponential term increases sharply, making the system's response to the failure of the fluorine pump more sensitive and triggering the mixed drive or compressor alone operation in advance. This mechanism cannot be achieved in traditional linear judgment, and it can effectively avoid the oscillation phenomenon when the system switches back and forth at the “critical temperature point”.

[0060] To explain the physical meaning of the formula, a specific working condition can be explained. For example, in a summer evening working condition, the external environment temperature is about , the output in the last step is , the indoor temperature rises by in three minutes, i.e. , the building heat capacity . The system calibration coefficient is taken as , the regular term parameter , and . Substituting the formula gives:

[0061] ;

[0062] The system compares this result with the empirical threshold . When it is close to the empirical threshold , it is judged that the current fluorine pump has reached the upper limit of the capacity, and the compressor should be intervened in advance. If the temperature change is slow or the fluorine pump efficiency is high, the system will continue to use the fluorine pump to delay the compressor operation, thereby achieving energy-saving operation.

[0063] To further enhance the universality in different building environments, a dynamic adjustment mechanism is introduced in the control logic in this step: if the system detects that the number of compressor interventions is higher than expected (e.g., more than the threshold in 24 hours) after running for a period of time, it automatically reduces the parameter , thereby increasing the delay tolerance of the system. This adaptive adjustment can be achieved through the statistical module inside the controller without external intervention, so that the control strategy can automatically maintain a reasonable balance in different use scenarios.

[0064] The output of this step is the compressor intervention signal , which takes on two values: “switch_now” and “delay”. The judgment rule is: when When the system output , the controller immediately sends a compressor start signal; when , the output , the fluorine pump continues to run alone.

[0065] From the perspective of control logic, this step forms a continuous decision chain with the previous stage. The first step quantifies the capacity of the fluorine pump, and the second step combines this capacity with the building thermal inertia to convert it into an overall energy balance judgment of the system, realizing the transition from capacity evaluation to action decision. This intervention model driven by state variables not only improves the accuracy of system judgment but also effectively prevents the compressor from frequently starting and stopping in the boundary interval, which is the key link in the invention scheme to realize energy-saving control and equipment protection. Step three: according to the capacity index and cooling balance state index results, a control index is calculated through a control scoring function to generate the driving mode that the system should adopt at the current time, including starting only the fluorine pump, mixed operation of the fluorine pump and the compressor, and starting only the compressor; specifically including:

[0066] The core goal of this step is to convert the system state evaluation results obtained in the previous two steps into actual control actions, i.e., generating the driving mode that the system should adopt at the current time

[0067] . This action not only needs to consider the urgency of the system's intervention of the compressor (i.e. ), but also needs to combine the running section of the environment temperature to modify the control boundary, so as to avoid frequent switching of the driving mode, response lag, or unnecessary starting and stopping of the compressor, thereby improving the overall energy efficiency and stability of the system. Unlike traditional control logic based on single threshold switching, this step innovatively combines the environmental temperature section logic with system running situation quantitative indicators and introduces a dynamic damping term to suppress driving mode jitter, thereby establishing a new control strategy with "temperature section trend awareness + system energy urgency fusion + mode switching stability enhancement". In a dual-energy driving system, whether the switching of the compressor and the fluorine pump is reasonable directly determines the system energy efficiency ratio (COP) and the equipment life, so this step is the most critical control output link in the entire control chain.

[0068] In order to more reasonably control the system to enter the fluorine pump alone, dual-drive mixed or compressor alone working state, this step constructs a new control index

[0069] , which not only includes direct influence, but also introduces an environmental temperature section guide term and a driving mode switching inertia damping term. The entire control scoring function is as follows:

[0070] ​;

[0071] wherein, represents whether the system is currently in urgent need of the compressor; is the ambient temperature; and are the temperature section boundaries of the fluorine pump and the compressor dominant operation, respectively, which are usually set as and ; is the weight of the ambient temperature guide term, used to strengthen the influence of environmental factors on the control strategy; is a segmented enhancement function, whose nonlinear form is used to significantly promote the system switching intention when the temperature approaches the boundary.

[0072] The third term is an inertia suppression term, is a damping weight coefficient, is the change amplitude of the driving mode per unit time, reflecting the intensity of the last driving mode switching. This term is specially designed for this step to solve the common “mode oscillation problem” of dual-energy driving systems in engineering, that is, the system frequently switches between “F+C” and “C” in the critical zone of ambient temperature, resulting in frequent start-stop of the compressor, affecting the use experience and equipment life. This variable can be realized by the switching signal buffer register set in the controller, which judges whether the jump occurs between the previous and next driving outputs and gives a time difference weighting. Through this term, even if and point to mode switching, but if the system has just switched and the time interval is too short, the damping term will significantly increase, suppressing the switching intention and playing a control smoothing role.

[0073] The final output of the driving mode is mapped by , and the mapping relationship is as follows:

[0074] If , then , the system starts the fluorine pump and stops the compressor;

[0075] If , then , enter the dual-drive hybrid operation;

[0076] If , then , the system stops the fluorine pump and starts the compressor only.

[0077] wherein and are the demarcation thresholds of the system control interval, which are determined by actual load response and cold source efficiency test in the system calibration process, and are generally set as , , which can be adaptively adjusted according to the application area (south / north / coastal).

[0078] Taking an actual scene as an example, if the current ambient temperature is , , the system last driving mode has been switched from “F” to “F+C” within 3 minutes, then , substitute calculation:

[0079]

[0080]

[0081]

[0082] ;

[0083] The system judges , so the current running state should be “F+C”, that is, the fluorine pump and the compressor are operated cooperatively to maintain the stability of the system refrigeration.

[0084] The final output variable is , which is converted into a driving instruction by a PLC control program to start and stop the control loop of the fluorine pump and the compressor. Since has integrated system energy evaluation, environmental conditions and switching stability, the output instruction has good predictability and anti-disturbance ability, can significantly suppress boundary oscillation and unexpected switching, and is particularly suitable for mixed season operation scenes with large day-night temperature difference and strong load fluctuation.

[0085] Please refer to Figure 2 , in the second aspect of the present application, a compressor and fluorine pump dual-energy driving control system based on ambient temperature recognition is also proposed, comprising:

[0086] A fluorine pump refrigeration capacity judgment module is configured to calculate the capacity index of the fluorine pump independently undertaking the refrigeration task at the current ambient temperature by collecting the ambient temperature, the refrigerant saturation temperature and the condenser outlet temperature, and the refrigerant saturation temperature is obtained by collecting the refrigerant pressure through a low-pressure side pressure sensor and looking up a table; the capacity index is used to judge whether the fluorine pump has the ability to independently complete the refrigeration cycle under the current working condition, when the capacity index is greater than a preset threshold value, no action is needed, and when the capacity index is less than the preset threshold value, it indicates that the compressor needs to be involved;

[0087] A dynamic evaluation module is configured to calculate a cooling balance state index by the capacity index, the collected indoor temperature change rate and the building equivalent heat capacity in a state where the compressor needs to be involved, for quantifying the urgency of the compressor intervention, and the building equivalent heat capacity is determined by energy consumption test or simulation model in the debugging stage; when the cooling balance state index is less than a preset value, the compressor does not need to be started, and when the cooling balance state index is greater than or equal to the preset value, the mixed driving or the compressor alone is triggered.

[0088] a driving output mode guiding module, configured to calculate a control index by a control score function according to the capability index and the cooling balance state index result, and generate a driving mode to be adopted by the system at the current moment, wherein the driving mode comprises starting only the fluorine pump, mixed operation of the fluorine pump and the compressor, and starting only the compressor.

[0089] The above embodiments merely describe the preferred embodiments of the present application, and are not intended to limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements to the technical solutions of the present application made by those of ordinary skill in the art shall fall within the protection scope of the present application as defined by the claims.

Claims

1. A method for dual energy driving control of a compressor and a fluorine pump based on ambient temperature recognition, characterized in that, Comprise the following steps: By collecting ambient temperature, refrigerant saturation temperature and condenser outlet temperature, the ability index of the fluorine pump to independently undertake refrigeration task under the current ambient temperature is calculated, and the refrigerant saturation temperature is obtained by collecting the refrigerant pressure through the low-pressure side pressure sensor and looking up the table; The ability index is used to judge whether the fluorine pump has the ability to independently complete the refrigeration cycle under the current working condition, and when the ability index is greater than the preset threshold, no action is needed, and when the ability index is less than the preset threshold, it means that the compressor needs to be involved; Under the condition that the compressor needs to be involved, the cooling balance state index is calculated by the ability index, the indoor temperature change rate and the building equivalent heat capacity, which is used to quantify the urgency of the compressor intervention, and the building equivalent heat capacity is determined by energy consumption test or simulation model in the debugging stage; When the cooling balance state index is less than the preset value, the compressor does not need to be started, and when the cooling balance state index is greater than or equal to the preset value, the mixed drive or the compressor alone is triggered to run; According to the results of the ability index and the cooling balance state index, the control index is calculated by the control scoring function, which is used to generate the driving mode that the system should adopt at the current time, and the driving mode includes starting the fluorine pump only, mixed driving of fluorine pump and compressor, and starting the compressor only; The control scoring function includes an environmental temperature paragraph guide item and a driving mode switching inertia damping item; The environmental temperature paragraph guide item is used to strengthen the influence of environmental factors on the control strategy, and the driving mode switching inertia damping item is used to solve the problem of frequent switching of dual-energy drive in the critical area of environmental temperature in engineering, which leads to frequent start-stop of the compressor; The driving mode is derived from a control index mapping, and the mapping relationship is as follows: If then only the fluorine pump is started, the compressor is stopped; If then , the fluorine pump and compressor dual-drive hybrid operation; If then , stop the fluorine pump and start the compressor only; wherein, with is a threshold value of the control interval, denotes a drive mode, F denotes starting the fluorine pump, denotes starting the compressor, denotes a dual-drive mixed operation of the fluorine pump and the compressor.

2. The method of claim 1, wherein the compressor and fluorine pump dual energy driving control method is based on an ambient temperature recognition. The condenser outlet temperature is collected by a K-type thermocouple attached to the surface of the copper pipe; The ambient temperature is collected by a digital temperature sensor arranged at the air outlet of the equipment shell.

3. The method of claim 1, wherein the compressor and fluorine pump dual energy driving control method is based on an ambient temperature recognition. In the process of calculating the ability index, an empirical coefficient obtained by working condition calibration in the debugging process is introduced, which is used to suppress the low-temperature amplification effect and the temperature sensitivity of the control index change, enhance the dynamic compensation of the environmental temperature to the cold source efficiency, suppress the fluorine pump judgment too optimistic at high temperature, and improve the judgment reliability at low temperature.

4. The method of claim 1, wherein, In the process of calculating the cooling balance state index, a regular correction term is introduced, which tends to zero when the fluorine pump refrigeration effect is good, and the compressor will not be started in advance; When the fluorine pump refrigeration effect is not good, the system becomes more sensitive to the fluorine pump failure through correction, and mixed driving or compressor alone is triggered in advance.

5. The method of claim 4, wherein, A dynamic adjustment mechanism is introduced: if the number of compressor interventions is higher than expected after the system runs for a period of time, that is, the number of interventions in the preset period exceeds the intervention threshold, the regular correction term is reduced, thereby increasing the delay tolerance of the system.

6. The method of claim 1, wherein, Based on the cooling balance state index result, the compressor intervention signal is output, specifically: When the cooling balance state index is less than the preset value, the compressor does not need to be started, and the fluorine pump continues to run alone; When the cooling balance state index is greater than or equal to the preset value, the controller immediately sends a compressor start signal to trigger mixed driving or compressor alone.

7. A compressor and fluorine pump dual energy drive control system based on ambient temperature recognition, characterized by, Comprise the following steps: The fluorine pump refrigeration capacity judgment module is configured to calculate a capacity index of the fluorine pump independently undertaking a refrigeration task at a current ambient temperature by collecting an ambient temperature, a refrigerant saturation temperature, and a condenser outlet temperature, and the refrigerant saturation temperature is obtained by collecting refrigerant pressure through a low-pressure side pressure sensor and looking up a table; the capacity index is used to judge whether the fluorine pump has the capacity to independently complete a refrigeration cycle under a current working condition, and when the capacity index is greater than a preset threshold, no action is needed, and when the capacity index is less than the preset threshold, it indicates that the compressor needs to be involved; The dynamic evaluation module is configured to calculate a cooling balance state index by the capacity index, a collected indoor temperature change rate, and an equivalent heat capacity of a building to quantify the urgency of the compressor intervention, the equivalent heat capacity of the building being determined by energy consumption testing or a simulation model in a debugging stage; when the cooling balance state index is less than a preset value, the compressor does not need to be started, and when the cooling balance state index is greater than or equal to the preset value, the mixed driving or the compressor alone is triggered to run; The driving output mode guiding module is configured to calculate a control index by a control scoring function according to the capacity index and the cooling balance state index result, to generate a driving mode to be adopted by the system at the current time, the driving mode including starting only the fluorine pump, mixed running of the fluorine pump and the compressor, and starting only the compressor; The control scoring function includes an ambient temperature paragraph guiding item and a driving mode switching inertia damping item; The ambient temperature paragraph guiding item is used to strengthen the influence of environmental factors on the control strategy, and the driving mode switching inertia damping item is used to solve the problem of frequent switching of the dual-energy driving in the critical zone of the ambient temperature, which leads to frequent starting and stopping of the compressor; The driving mode is derived from a control index mapping, and the mapping relationship is as follows: If then only the fluorine pump is started, the compressor is stopped; If then , the fluorine pump and compressor dual-drive hybrid operation; If then , stop the fluorine pump and start the compressor only; wherein, with is a threshold value of the control interval, denotes a drive mode, F denotes starting the fluorine pump, denotes starting the compressor, denotes a dual-drive mixed operation of the fluorine pump and the compressor.

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