CN111811107A - Four-way valve reversing abnormity diagnosis control method and device and air source heat pump system - Google Patents
Four-way valve reversing abnormity diagnosis control method and device and air source heat pump system Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 71
- 238000003745 diagnosis Methods 0.000 title claims abstract description 36
- 230000002159 abnormal effect Effects 0.000 claims abstract description 100
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 93
- 230000005856 abnormality Effects 0.000 claims description 74
- 238000010257 thawing Methods 0.000 claims description 27
- 238000001514 detection method Methods 0.000 claims description 25
- 230000001276 controlling effect Effects 0.000 claims description 21
- 238000010438 heat treatment Methods 0.000 claims description 20
- 239000007788 liquid Substances 0.000 claims description 19
- 230000000903 blocking effect Effects 0.000 claims description 12
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 8
- 229910052731 fluorine Inorganic materials 0.000 claims description 8
- 239000011737 fluorine Substances 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 230000007613 environmental effect Effects 0.000 claims description 5
- 230000002441 reversible effect Effects 0.000 claims description 5
- 230000009471 action Effects 0.000 abstract description 16
- 239000006071 cream Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 238000012545 processing Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 238000007599 discharging Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
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- 238000006243 chemical reaction Methods 0.000 description 1
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- 230000000694 effects Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/38—Failure diagnosis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
-
- 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
- F24F11/52—Indication arrangements, e.g. displays
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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Abstract
The application relates to a four-way valve reversing abnormity diagnosis control method, a four-way valve reversing abnormity diagnosis control device and an air source heat pump system, wherein the four-way valve reversing abnormity diagnosis control method comprises the steps of judging whether the four-way valve reversing meets a reversing abnormity pre-judgment condition; if the reversing abnormity pre-judgment condition is met, detecting preset system data of a system to which the four-way valve belongs, and judging whether reversing of the four-way valve meets the reversing abnormity accurate judgment condition according to the system data; and if the accurate judgment condition of the reversing abnormity is met, judging that the reversing of the four-way valve is abnormal. The four-way valve reversing abnormity diagnosis under various operating modes under all working conditions can be realized, the reversing abnormity pre-judgment condition and the reversing abnormity accurate judgment condition are set, the secondary judgment is carried out on the reversing abnormity of the four-way valve, the reversing abnormity error protection action of the four-way valve is prevented, and the fault rate of the system is reduced.
Description
Technical Field
The application belongs to the technical field of four-way valve control, and particularly relates to a four-way valve reversing abnormity diagnosis control method and device and an air source heat pump system.
Background
The four-way valve is one of important components of the heat pump air conditioner, and the air source heat pump system realizes the conversion between a refrigeration mode and a heating mode through the four-way valve, so that the requirements of users on indoor temperature in different seasons are met. The air source heat pump system is started and stopped by the four-way valve and is frequently reversed during low-temperature heating operation in winter, the hot fluoride frost four-way valve is frequently reversed, the four-way valve is easily reversed to be out of position during low-pressure difference or low-load starting and stopping or hot fluoride frost operation, so that the unit is abnormal in operation, the heating effect is poor, even the heat exchanger of the water system is damaged by ice blockage and bursting, and the failure rate of the unit is increased.
According to the traditional method for diagnosing the reversing abnormality of the four-way valve, a water inlet temperature sensing bulb and a water outlet temperature sensing bulb are respectively arranged on an outer machine heat exchanger and an inner machine heat exchanger, and the temperature difference between the two is obtained for analysis, so that whether the four-way valve is abnormal in reversing is obtained. For example, the air source heat pump system judges whether the temperature difference of inlet and outlet water is not less than the temperature difference threshold value Deltat (namely T) in the low-temperature heating stateInflow water-TDischarging waterAnd the delta t is more than or equal to the delta t (the default value is that the delta t is 4 ℃), and if the temperature difference of inlet and outlet water is not less than the temperature difference threshold value, the four-way valve of the unit is judged to be abnormal in reversing. Because the temperature difference threshold value delta t is preset and is stored in the system as a default value once being set, however, the default value delta t cannot meet the unified judgment conditions of all the operation modes under all the working conditions, such as: the unit is lowThe four-way valve can normally perform reversing action in a low-frequency and low-load operation state or an ultralow-temperature heating capacity attenuation operation state, but the judgment condition of whether the temperature difference between inlet water and outlet water is not less than the temperature difference threshold value delta t is met, at the moment, the unit can mistakenly report the reversing abnormality of the four-way valve to perform fault protection, so that the unit is abnormally stopped in normal operation, and the normal use of the system is influenced due to the fact that the abnormal reversing protection action of the four-way valve frequently occurs because only one abnormal judgment is performed in the diagnosis process.
Disclosure of Invention
In order to overcome the problems that in the traditional four-way valve reversing abnormity diagnosis method, a unit can falsely report the reversing abnormity of the four-way valve and carry out fault protection because a delta t default value cannot meet the unified judgment condition of all operation modes under all working conditions, the unit is abnormally stopped under normal operation, and the normal use of the system is influenced because the abnormal judgment is carried out only once in the diagnosis process, the four-way valve reversing abnormity and mistaken protection action is frequently generated, and the four-way valve reversing abnormity diagnosis control method, the four-way valve reversing abnormity diagnosis device and the air source heat pump system are provided.
In a first aspect, the present application provides a method for diagnosing and controlling a commutation abnormality of a four-way valve, comprising:
judging whether the four-way valve meets a pre-judgment condition for abnormal reversing or not;
if the reversing abnormity pre-judgment condition is met, detecting preset system data of a system to which the four-way valve belongs, and judging whether reversing of the four-way valve meets the reversing abnormity accurate judgment condition according to the system data;
and if the accurate judgment condition of the reversing abnormity is met, judging that the reversing of the four-way valve is abnormal.
Further, the preset system data includes: one or more of an ambient temperature value, a defrost temperature value, a liquid tube temperature value.
Further, preset system data includes ambient temperature value, changes white temperature value and liquid pipe temperature value, according to system data judges whether the cross valve switching-over satisfies the unusual accurate judgement condition of switching-over, include:
and if the defrosting temperature value is greater than the environmental temperature value, and the difference value between the defrosting temperature value and the liquid pipe temperature value is greater than a preset threshold value, judging that the reversing of the four-way valve meets the reversing abnormal accurate judgment condition.
Further, the judging whether the four-way valve reversing meets the reversing abnormity pre-judging condition includes:
detecting a water inlet temperature value and a water outlet temperature value of a system to which the four-way valve belongs, determining a preset temperature difference, and if the difference value of the water inlet temperature value and the water outlet temperature value is larger than the preset temperature difference;
and/or the presence of a gas in the gas,
detecting a temperature drop rate value of the outlet water temperature of a system to which the four-way valve belongs, and if the temperature drop rate value is greater than or equal to a temperature drop rate value default value;
then the four-way valve is judged to be switched to meet the condition of abnormal switching judgment in advance.
Further, the determining the predetermined temperature difference includes:
calculating the difference value between the inlet water temperature value and the outlet water temperature value to obtain the current inlet and outlet water temperature difference;
and determining the smaller value between the current water inlet and outlet temperature difference and a preset water inlet and outlet temperature difference default value as a preset temperature difference.
Further, before judging whether the four-way valve reversing meets the reversing abnormity pre-judgment condition, the method further comprises the following steps:
judging whether the unit running state meets the initial running condition at the same time, wherein the initial running condition comprises the following steps: when the unit operates in the heating mode, the compressor is in an operating state and the four-way valve is in a power-on state;
and after the initial operation condition is met, judging whether the four-way valve meets a reversing abnormity pre-judgment condition or not.
Further, after judging that the four-way valve is abnormal in reversing, the method further comprises the following steps:
clearing the abnormal reversing fault of the four-way valve;
judging whether the four-way valve reversing meets a reversing abnormity pre-judgment condition or not after the clearing operation is executed;
if the reversing abnormity pre-judgment condition is met, judging whether the reversing of the four-way valve meets the reversing abnormity accurate judgment condition;
if the accurate judgment condition of the reversing abnormity is met, the reversing abnormity of the four-way valve is judged, the unit executes fault shutdown, and fault locking is carried out.
Further, the operation of clearing the abnormal reversing fault of the four-way valve comprises:
and clearing the abnormal reversing fault of the low-frequency running four-way valve of the compressor and the abnormal reversing fault of the high-frequency running four-way valve of the compressor.
Further, the operation of clearing the abnormal reversing fault of the low-frequency running four-way valve of the compressor comprises the following steps:
judging whether the current operating frequency meets a first frequency requirement, if so, adjusting the current opening of the electronic expansion valve;
after the current opening degree of the electronic expansion valve is adjusted, the four-way valve is subjected to power-down reversing;
performing frequency boosting operation on the frequency of the compressor according to a first preset frequency boosting value;
and performing secondary reversing of the power-on of the four-way valve after the frequency boosting operation is performed.
Further, the first frequency requirement includes: the current operating frequency is not greater than a first preset frequency value.
Further, after the four-way valve is powered on for the second switching, the method further comprises the following steps:
judging whether the reversing of the four-way valve meets a reversing abnormity accurate judgment condition;
if the frequency does not meet the preset frequency increasing value, the frequency of the compressor is increased according to the second preset frequency increasing value after the preset second reversing time is waited;
and circularly executing the clearing operation of the reversing abnormal fault of the low-frequency running four-way valve of the compressor until the preset circulating execution times or fault clearing is reached.
Further, after the preset number of times of executing the loop is reached, the method further includes:
judging whether the current running frequency meets a second frequency requirement, if so, adjusting the gear of the fan and then powering on the four-way valve to forcibly reverse;
after the second reversing time is preset, the four-way valve is switched over in a power-down mode, and meanwhile the fan is stopped;
after the fan is stopped and the preset second reversing time is passed, the four-way valve is electrified to be forcibly reversed;
if the accurate judgment condition of the abnormal reversing is still met, the unit displays the blocking fault of the four-way valve, and the unit stops due to the fault and operates in a fault locking mode.
Further, the second frequency requirement includes: the sum of the current operating frequency and the second preset frequency value is not greater than the third preset frequency value.
Further, the operation of clearing the abnormal reversing fault of the compressor high-frequency operation four-way valve comprises the following steps:
judging whether the current operating frequency meets the third frequency requirement, if so, executing fault shutdown of the unit, and closing the electronic expansion valve;
after the unit executes the fault shutdown preset time, the frequency of the compressor is boosted according to a third preset boosting value;
adjusting the opening of the electronic expansion valve;
after the opening of the electronic expansion valve is adjusted, the four-way valve is reversed.
Further, the third frequency requirement includes: the current operating frequency is greater than a first preset frequency value.
Further, after the four-way valve performs reversing action, the method further comprises the following steps:
judging whether the reversing of the four-way valve meets a reversing abnormity accurate judgment condition;
if the fault is not met, circularly executing the clearing operation of the reversing abnormal fault of the high-frequency operation four-way valve of the compressor until the preset circulating execution times or fault clearing is reached;
after the preset cycle execution times are reached, if the reversing abnormity accurate judgment condition is still met, the unit displays the four-way valve blocking fault, and the unit stops the machine due to the fault and operates in a fault locking mode.
Further, if the judgment does not satisfy the accurate judgment condition for the abnormal commutation, the method further comprises the following steps:
and clearing the detection zone bit of the abnormal reversing fault of the four-way valve.
Further, the method also comprises the following steps:
the method for estimating the current water inlet and outlet temperature difference specifically comprises the following steps:
estimating the maximum output frequency of the unit according to the current operating environment temperature, the water inlet temperature and the water outlet temperature;
obtaining the current output frequency according to the maximum output frequency;
acquiring the regulated water flow of the current water pump;
and estimating the current water inlet and outlet temperature difference according to the current output frequency and the regulated water flow of the current water pump.
In a second aspect, the present application provides a four-way valve commutation abnormality diagnosis control apparatus, including:
the first judgment module is used for judging whether the reversing of the four-way valve meets a reversing abnormity pre-judgment condition or not;
the second judgment module is used for detecting preset system data of a system to which the four-way valve belongs when the reversing abnormity pre-judgment condition is met, and judging whether reversing of the four-way valve meets the reversing abnormity accurate judgment condition or not according to the system data;
and the judging module is used for judging that the four-way valve is abnormal in reversing when the accurate reversing judgment condition is met.
In a third aspect, the present application provides an air-source heat pump system comprising:
the four-way valve commutation abnormality diagnosis control apparatus according to the second aspect.
Further, the air-source heat pump system includes:
the water side system is used for acquiring a pre-judgment condition parameter of the reversing abnormity;
and the fluorine side system is used for acquiring the abnormal accurate judgment condition parameters of the reversing.
The technical scheme provided by the embodiment of the application can have the following beneficial effects:
the four-way valve reversing abnormality diagnosis control method, the four-way valve reversing abnormality diagnosis control device and the air source heat pump system provided by the embodiment of the invention judge whether the four-way valve reversing meets a reversing abnormality pre-judgment condition, if the reversing abnormality pre-judgment condition is met, preset system data of a system to which the four-way valve belongs are detected, whether the four-way valve reversing meets a reversing abnormality accurate judgment condition is judged according to the system data, if the reversing abnormality accurate judgment condition is met, the four-way valve reversing abnormality is judged, the four-way valve reversing abnormality diagnosis under various operation modes under all working conditions can be realized, the four-way valve reversing abnormality is secondarily judged by setting the reversing abnormality pre-judgment condition and the reversing abnormality accurate judgment condition, the occurrence of a four-way valve reversing abnormality false protection action is.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
Fig. 1 is a flowchart of a four-way valve commutation abnormality diagnosis control method according to an embodiment of the present application.
Fig. 2 is a graph illustrating a heating performance decay curve of a heat pump system according to an embodiment of the present application.
Fig. 3 is a schematic diagram of an air-source heat pump system according to an embodiment of the present application.
Fig. 4 is a flowchart of a control method for diagnosing a commutation abnormality of a four-way valve according to another embodiment of the present application.
Fig. 5 is a block diagram of a four-way valve reversing abnormal logic control according to an embodiment of the present disclosure.
Fig. 6 is a flowchart of a control method for diagnosing a commutation abnormality of a four-way valve according to another embodiment of the present application.
Fig. 7 is a schematic diagram of a state of a compressor at a four-way valve reversing abnormality detection stage according to an embodiment of the present application.
Fig. 8 is a flowchart of another control method for diagnosing a commutation abnormality of a four-way valve according to an embodiment of the present disclosure.
Fig. 9 is a timing diagram of load actions in a four-way valve reversing abnormal fault handling stage according to an embodiment of the present application.
Fig. 10 is a flowchart of a four-way valve commutation abnormality diagnosis control method according to another embodiment of the present application.
Fig. 11 is a flowchart of another control method for diagnosing a commutation abnormality of a four-way valve according to an embodiment of the present disclosure.
Fig. 12 is a timing diagram of load actions in a four-way valve commutation abnormal fault handling phase according to another embodiment of the present application.
Fig. 13 is a functional structure diagram of a four-way valve commutation abnormality diagnosis control apparatus according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail below. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 1 is a flowchart of a four-way valve commutation abnormality diagnosis control method according to an embodiment of the present application, and as shown in fig. 1, the four-way valve commutation abnormality diagnosis control method includes:
s11: judging whether the four-way valve meets a reversing abnormity prejudgment condition or not, wherein the method comprises the following modes;
the first method is as follows: detecting a water inlet temperature value and a water outlet temperature value of a system to which the four-way valve belongs, determining a preset temperature difference, and if the difference value of the water inlet temperature value and the water outlet temperature value is larger than the preset temperature difference;
in some embodiments, determining the predetermined temperature difference comprises:
calculating the difference value between the water inlet temperature value and the water outlet temperature value to obtain the current water inlet and outlet temperature difference;
and determining the smaller value between the current water inlet and outlet temperature difference and the preset water inlet and outlet temperature difference default value as the preset temperature difference.
Namely that the condition 1 of the abnormal commutation is TInflow water-TDischarging water≥TTemperature differenceWherein T isInflow waterFor inlet water temperature, TDischarging waterIs the temperature of the outlet water, TTemperature differenceMin (Δ T ), Δ T being the current temperature difference between the inlet and outlet water, Δ T being the default value of the temperature difference between the inlet and outlet water, for example, Δ T being 4 ℃.
In some embodiments, further comprising:
the method for estimating the current water inlet and outlet temperature difference specifically comprises the following steps:
estimating the maximum output frequency of the unit according to the current operating environment temperature, the water inlet temperature and the water outlet temperature;
obtaining the current output frequency according to the maximum output frequency;
acquiring the regulated water flow of the current water pump;
and estimating the current water inlet and outlet temperature difference according to the current output frequency and the current regulated water flow of the water pump.
The specific estimation process comprises the following steps: estimating the maximum output frequency P of the unit according to the current operating environment temperature, the water inlet temperature and the water outlet temperaturemax(ii) a Calculating the maximum power output P according to the nominal performance design condition of the unitmax，PmaxFor a nominal 100% load output point of the heating capacity, the attenuation percentage of the unit heating capacity under the current operating condition can be pre-calculated according to the attenuation curve shown in fig. 2, for example, the attenuation percentage is: 80%, calculating the current output power P, such as P80% Pmax。
The method comprises the steps of predicting the regulated water flow Q of the current water pump according to a variable frequency control gear and a tail end lift curve of the water pump, and calculating the current inlet and outlet water temperature difference delta T according to a heat transfer formula P which is CQ delta T and C which is the specific heat capacity of heat transfer medium water of a system.
As shown in FIG. 3, the conventional air source heat pump system solves the problem of abnormal reversing of the four-way valve by judging whether the temperature difference of inlet and outlet water meets the temperature difference condition delta T (namely T) under the low-temperature heating stateInflow water-TDischarging waterNot less than delta t (default value: delta t ═ 4 ℃), then judgingThe four-way valve of the unit is abnormally reversed, the unit displays the fault of the four-way valve, the fault cannot be recovered, and the unit is stopped due to the fault.
In this embodiment, the water inlet and outlet temperature difference threshold value breaks through that the traditional default value set when the unit leaves the factory is Δ t ═ 4 ℃, but the current water inlet and outlet temperature difference is calculated in real time according to the running state of the unit, and then the current water inlet and outlet temperature difference is compared with the factory default value in real time to adjust and judge, so that the water inlet and outlet temperature difference threshold value is more accurate.
The second method comprises the following steps: detecting a temperature drop rate value of the outlet water temperature of a system to which the four-way valve belongs, and if the temperature drop rate value is greater than or equal to a temperature drop rate value default value;
temperature T of outlet waterDischarging waterTemperature drop rate of kappa ≧ kappa0Wherein κ is0Default values for the rate of temperature drop, default values: kappa0＝0。
Because the temperature of inlet and outlet water is difficult to obtain under some working conditions, the condition of temperature difference of inlet and outlet water cannot meet the condition of abnormal reversing diagnosis of the four-way valve under all the operating modes under all the working conditions, and therefore the condition of temperature difference of inlet and outlet water and the condition of temperature drop rate can be set to realize the abnormal reversing diagnosis of the four-way valve under various operating modes under all the working conditions.
It should be noted that when the four-way valve commutation abnormality pre-judgment is performed, if the above-mentioned manner is satisfied, it can be determined that the four-way valve commutation satisfies the commutation abnormality pre-judgment condition.
S12: if the reversing abnormity pre-judgment condition is met, detecting preset system data of a system to which the four-way valve belongs, and judging whether reversing of the four-way valve meets the reversing abnormity accurate judgment condition according to the system data;
in some embodiments, the pre-setting system data includes: one or more of an ambient temperature value, a defrost temperature value, a liquid tube temperature value.
As an optional implementation manner of the present invention, the preset system data includes an environmental temperature value, a defrosting temperature value, and a liquid pipe temperature value, and whether or not the four-way valve is switched to meet an abnormal switching accurate determination condition is determined according to the system data, including:
and if the defrosting temperature value is greater than the environmental temperature value and the difference value between the defrosting temperature value and the liquid pipe temperature value is greater than a preset threshold value, judging that the reversing of the four-way valve meets the reversing abnormal accurate judgment condition.
The preset threshold value is, for example, 5 ℃, that is, whether the four-way valve meets the abnormal accurate judgment condition for the reversing or not includes:
Tdefrosting cream＞TEnvironment(s)And T isDefrosting cream-TLiquid pipeNot less than 5 ℃ and wherein TEnvironment(s)Ambient temperature, T, obtained for the ambient bulb of the fluorine side systemDefrosting creamDefrosting temperature, T, obtained for a fluorine side system defrosting bulbLiquid pipeThe temperature of the liquid pipe obtained by the fluorine side system liquid pipe temperature sensing bulb.
S13: and if the accurate judgment condition of the reversing abnormity is met, judging that the reversing of the four-way valve is abnormal.
If TDefrosting cream＞TEnvironment(s)And T isDefrosting cream-TLiquid pipeAnd if the temperature is more than or equal to 5 ℃, judging that the four-way valve is abnormal.
If TDefrosting cream＜TEnvironment(s)Or TDefrosting cream-TLiquid pipeIf the temperature is less than 5 ℃, the four-way valve is not judged to be abnormal.
The ambient temperature T acquired by the ambient temperature bulb of the fluorine side system is detected in real time due to the irreversibility of throttling of the fluorine side system before and after the four-way valve is reversedEnvironment(s)Defrosting temperature T acquired by defrosting thermometer bulbDefrosting creamLiquid tube temperature T acquired by liquid tube temperature sensing bulbLiquid pipeEtc. comparison of TEnvironment(s)And TDefrosting creamCarrying out irreversible heat exchange temperature difference judgment on an evaporation side in a normal heating state; binding comparison TDefrosting creamAnd TLiquid pipeThe intelligent diagnosis of the four-way valve reversing abnormity is accurate, and the phenomenon that the reversing abnormity misjudgment of the four-way valve generates the reversing abnormity fault misprotection action is prevented.
In this embodiment, by determining whether or not the four-way valve commutation satisfies a commutation abnormality pre-determination condition, the commutation abnormality pre-determination condition includes: the four-way valve reversing abnormity diagnosis under various operating modes under all working conditions can be realized under the conditions of temperature difference of inlet and outlet water and/or the temperature drop rate, the reversing abnormity of the four-way valve is secondarily judged by setting the reversing abnormity pre-judging condition and the reversing abnormity accurate judging condition, the occurrence of the reversing abnormity error protection action of the four-way valve is prevented, and the fault rate of the system is reduced.
The embodiment of the invention provides another method for diagnosing and controlling the reversing abnormality of a four-way valve, which is shown in a flow chart shown in fig. 4 and comprises the following steps:
s41: judging whether the unit running state meets the initial running condition at the same time, wherein the initial running condition comprises the following steps: when the unit operates in the heating mode, the compressor is in an operating state and the four-way valve is in a power-on state;
s42: judging whether the four-way valve meets a reversing abnormity pre-judgment condition or not after the initial operation condition is met;
according to the running state of the compressor, the heating mode compressor is in an ON state (ON) and does not execute defrosting action, and the reversing abnormity is pre-judged under the power-ON state of the four-way valve, so that the judgment result can be prevented from being more accurate.
S43: after the four-way valve is judged to be abnormal in reversing, clearing the abnormal reversing fault of the four-way valve;
s44: after the clearing operation is executed, the four-way valve reversing abnormity pre-judgment and the accurate judgment are carried out again;
s45: if the accurate judgment condition of the reversing abnormity is met, the reversing abnormity of the four-way valve is judged, the unit executes fault shutdown, and fault locking is carried out.
As shown in fig. 5, the initial operation condition is determined before the four-way valve reversing abnormality pre-determination, if the initial operation condition is satisfied at the same time, the four-way valve reversing abnormality pre-determination stage is entered, otherwise, the detection is directly exited. And judging the condition 1 and the condition 2 in a four-way valve reversing abnormity pre-judging stage, judging that the four-way valve is abnormal in reversing when the condition 1 and the condition 2 meet one of the conditions, and entering a four-way valve reversing abnormity accurate judging stage. And if the condition 1 and the condition 2 are not met, directly quitting the detection. The four-way valve reversing abnormity accurate judgment stage comprises a judgment condition 3 and a judgment condition 4, when the judgment conditions 3 and 4 are met simultaneously, the four-way valve reversing abnormity is judged, otherwise, the detection is quitted.
The traditional four-way valve reversing abnormal fault protection is an unrecoverable fault, and the unit is stopped due to a fault. In such a fault state, the failure of the four-way valve caused by insufficient reversing (insufficient reversing pressure difference, gas leakage of the four-way valve or accidental one-time reversing failure) and complete blocking of the four-way valve (blocking of a sliding block of the four-way valve due to entering of foreign matters or blocking of a pilot valve due to dirty blocking of the pilot valve) cannot be effectively distinguished. The four-way valve reversing abnormal fault protection completely judges that the fault can not be recovered once, so that the low-temperature heating can not normally run, and particularly the temperature drop ice blockage, the expansion and the crack damage of a unit water system can not be caused by the condition that the maintenance state is unavailable at night or users can not drain water in time. The four-way valve with restorability is not reversed in place, fault judgment is carried out, and one-time locking is carried out, so that the fault rate of the unit is increased.
In the embodiment, fault clearing is carried out on the four-way valve with recoverability when the four-way valve is not reversed in place, the fault rate of the unit is effectively reduced, the four-way valve is reversed to protect the recoverability fault from being cleared in time, normal heating of the unit is guaranteed, the unrecoverable fault is effectively locked, and the fault damage degree of the unit is prevented from being further increased.
The embodiment of the invention provides another method for diagnosing and controlling the reversing abnormality of a four-way valve, which is used for clearing the reversing abnormality fault of the four-way valve in the low-frequency operation of a compressor, and comprises the following steps of:
s61: judging whether the current operating frequency meets a first frequency requirement, if so, adjusting the current opening of the electronic expansion valve;
in some embodiments, the first frequency requirement comprises: current operating frequency Pn(Hz)≤P0(Hz)，P0Is a first predetermined frequency value.
S62: after the current opening degree of the electronic expansion valve is adjusted, the four-way valve is subjected to power-down reversing;
s63: performing frequency boosting operation on the frequency of the compressor according to a first preset frequency boosting value;
s64: after the frequency boosting operation is executed, the four-way valve is electrified for secondary reversing;
s65: after waiting for the preset second reversing time, raising the frequency of the compressor according to a second preset raising frequency value;
s66: and circularly executing the clearing operation of the reversing abnormal fault of the low-frequency running four-way valve of the compressor until the preset circulating execution times or fault clearing is reached.
The compressor state in the four-way valve reversing abnormality detection stage is shown in fig. 7, the compressor stage initialization stage is subjected to shielding detection, the compressor stage normal adjustment stage is subjected to normal detection, the compressor stage defrosting is adjusted to defrosting ending shielding detection, and the compressor stage defrosting is normally detected after defrosting is ended.
Aiming at the abnormal reversing of the four-way valve during the low-frequency operation of the compressor, the load action time sequence of the four-way valve in the abnormal reversing fault processing stage during the low-frequency operation is shown in figure 9, if the abnormal condition of the four-way valve is judged, the unit displays the abnormal fault of the four-way valve and simultaneously memorizes the current operation frequency Pn(Hz). If Pn(Hz)≤P0(Hz) (default: P0And (Hz) is 40Hz), the unit does not execute fault shutdown, the electronic expansion valve executes initial opening adjustment EXVc (B) according to the current opening, and the four-way valve is switched over in a power-down mode after timing for 30 s. Four-way valve power-down reversing and compressor frequency-up to heating reversing frequency (P)n+5) (Hz), and the four-way valve is electrified for secondary reversing after timing for 30 s. And the detection of abnormal reversing faults of the four-way valve is not executed in the two reversing periods.
After the two commutations are finished, the abnormal fault of the four-way valve is detected again, and if the detection condition is not met, the abnormal commutation fault of the four-way valve is eliminated; when the detection of the abnormal reversing fault of the four-way valve is met, the unit displays the abnormal fault of the four-way valve, and the secondary reversing frequency of the four-way valve is increased to (P) after 10minn+10) (Hz), while the four-way valve commutation exception fault handling cycle is executed again. The highest timing continuously executes the abnormal reversing fault processing cycle of the four-way valve for 5 times, and the secondary reversing frequency of the four-way valve is increased to be up to (P)n+25) (Hz). The gear of the fan is not adjusted in the whole frequency-increasing reversing process.
In some embodiments, as shown in fig. 8, after the preset number of loop executions is reached, the method further includes:
s81: judging whether the current running frequency meets a second frequency requirement, if so, adjusting the gear of the fan and then powering on the four-way valve to forcibly reverse;
the second frequency requirement includes: current operating frequency (P)n+Pi)(Hz)≤Ph(Hz)，PiFor a second predetermined frequency value, PhIs a third predetermined frequency value.
S82: after the second reversing time is preset, the four-way valve is switched over in a power-down mode, and meanwhile the fan is stopped;
s83: after the fan is stopped and the preset second reversing time is passed, the four-way valve is electrified to be forcibly reversed;
s84: if the accurate judgment condition of the abnormal reversing is still met, the unit displays the blocking fault of the four-way valve, and the unit stops due to the fault and operates in a fault locking mode.
Meanwhile, the four-way valve reversing abnormal fault can not be cleared after the four-way valve reversing abnormal fault processing cycle is carried out for 5 times, the four-way valve reversing abnormal fault detection is still met, and meanwhile, the judgment (P) is carried out in real timen+25)(Hz)≤Ph(Hz) (default: Ph(Hz) 50Hz), the unit maintains the compressor operating frequency (P)n+25) (Hz) is not adjusted, and the four-way valve is switched over when power failure and simultaneously executes the fan to reduce to the lowest gear, thereby meeting the requirement of the running frequency (P) of the compressorn+25) (Hz), and the four-way valve is electrified and forcibly reversed after the lowest gear of the fan is timed for 30 s. If the detection of the abnormal reversing fault of the four-way valve is still met, the unit maintains the running frequency (P) of the compressorn+25) (Hz) is not adjusted, and the four-way valve is switched over when power failure occurs after timing for 30s, and the fan is stopped, so that the running frequency (P) of the compressor is metn+25) (Hz), the four-way valve is electrified and forcibly reversed after the fan is stopped and timing is carried out for 30 s. If the detection of the abnormal reversing fault of the four-way valve is still met, the unit displays the blocking fault of the four-way valve, and the unit executes the fault and stops working and locks the fault.
If the four-way valve reversing abnormal fault detection is not met, the four-way valve reversing abnormal fault detection control is quitted, the fan is stopped, the four-way valve is forced to reverse, normal operation of the unit is guaranteed, and the four-way valve is normally reversed. And clearing the memory of the reversing abnormal fault detection zone bits of all the four-way valves, and reentering the reversing abnormal fault detection of the four-way valve in a new round, namely, re-executing the reversing abnormal pre-judgment of the four-way valve.
It should be noted that, the recoverable fault executes the automatic clearing of the unit fault, but the clearing times of the recoverable fault are accumulated, the fault is not always cleared, and the recoverable fault is finally executed to be effectively locked according to the judgment condition, that is: change to an unrecoverable failure.
In this embodiment, the operation of clearing away is carried out to compressor low frequency operation cross valve switching-over anomaly fault, effectively reduces the unit fault rate, in time clears away the cross valve switching-over anomaly protection recoverability fault, guarantees that the unit normally heats, and the effective locking of unrecoverable fault prevents further increase unit trouble damage degree.
The embodiment of the invention provides another method for diagnosing and controlling the reversing abnormality of a four-way valve, which is used for clearing the reversing abnormality fault of the four-way valve in the high-frequency operation of a compressor, as shown in a flow chart shown in fig. 10, and specifically comprises the following steps:
s101: judging whether the current operating frequency meets the third frequency requirement, if so, executing fault shutdown of the unit, and closing the electronic expansion valve;
the third frequency requirement includes: current operating frequency Pn(Hz)＞P0(Hz)，P0Is a first predetermined frequency value.
S102: after the unit executes the fault shutdown preset time, the frequency of the compressor is boosted according to a third preset boosting value;
s103: adjusting the opening of the electronic expansion valve;
s104: after the opening of the electronic expansion valve is adjusted, the four-way valve is reversed.
In some embodiments, as shown in fig. 11, after performing the reversing action of the four-way valve, it is determined that the condition for accurately determining the abnormal reversing is still satisfied, further comprising:
s111: the method comprises the following steps of circularly executing clearing operation on a reversing abnormal fault of a high-frequency running four-way valve of a compressor until the preset cycle execution times or fault clearing is reached;
s112: after the preset cycle execution times are reached, if the reversing abnormity accurate judgment condition is still met, the unit displays the four-way valve blocking fault, the unit stops due to the fault and the fault is locked;
s113: and clearing the detection zone bit of the abnormal reversing fault of the four-way valve.
Aiming at the problem of abnormal reversing of the four-way valve during high-frequency operation of the compressor and the problem of abnormal reversing of the four-way valve during high-frequency operationThe load action time sequence of the normal fault processing stage is shown in figure 12, if the condition for judging the four-way valve is met, the unit displays the abnormal fault of the four-way valve and simultaneously memorizes the current running frequency Pn(Hz). If Pn(Hz) > P0(Hz), the unit executes fault shutdown, and the electronic expansion valve is closed to 0 (B). The unit is restarted after being stopped for 1min, and the initialization frequency of the compressor is increased to (P)c+5) (Hz), electronic expansion valve initialization opening (EXVc-10) (B) (normal heating compressor initialization frequency P)cAnd the initial opening EXVc of the electronic expansion valve) is operated for 15s, then the reversing action of the four-way valve is executed, the abnormal fault detection of the four-way valve is not executed during the reversing period, and the fan maintains the initial gear and does not adjust.
After reversing is finished for 10min, the abnormal fault of the four-way valve is detected again, and if the detection condition is not met, the abnormal reversing fault of the four-way valve is eliminated; and if the detection of the reversing abnormal fault of the four-way valve is met, the unit displays the abnormal fault of the four-way valve, executes fault shutdown, and executes the reversing abnormal fault processing cycle of the four-way valve again. The highest timing continuously executes the abnormal reversing fault processing cycle of the four-way valve for 5 times, and the secondary reversing frequency of the four-way valve is increased to be up to (P)c+25) (Hz), electronic expansion valve initialization opening (EXVc-50) (B). If the detection of the abnormal reversing fault of the four-way valve is still met, the unit displays the blocking fault of the four-way valve, and the unit executes the fault and stops working and locks the fault.
In the embodiment, the reversing abnormal fault of the four-way valve in high-frequency operation of the compressor is cleared, the reversing abnormal protection restorable fault of the four-way valve is cleared in time, normal heating of the unit is guaranteed, the restorable fault is effectively locked, and the fault damage degree of the unit is prevented from being further increased.
The embodiment of the invention provides a four-way valve reversing abnormity diagnosis control device, as a functional structure diagram shown in fig. 13, the four-way valve reversing abnormity diagnosis control device comprises:
the first judging module 131 is configured to judge whether the four-way valve meets a reversing abnormality pre-judging condition.
And the second judging module 132 is configured to detect preset system data of a system to which the four-way valve belongs when the reversing abnormality pre-judging condition is met, and judge whether the reversing of the four-way valve meets the reversing abnormality accurate judging condition according to the system data.
And the determining module 133 is configured to determine that the four-way valve is abnormal in commutation when the accurate commutation judgment condition is met.
A third determining module 134, configured to determine whether the unit operation state simultaneously satisfies an initial operation condition, where the initial operation condition includes: when the unit operates in a heating mode, the compressor is in an operating state and the four-way valve is in a power-on state, and whether the reversing of the four-way valve meets a reversing abnormity pre-judgment condition or not is judged after initial operation conditions are met.
And the fault clearing module 135 is used for clearing abnormal reversing faults of the four-way valve.
The fault clearing module comprises a compressor low-frequency operation fault clearing unit and a compressor high-frequency operation fault clearing unit.
The compressor low-frequency operation fault clearing unit is used for clearing the reversing abnormal fault of the compressor low-frequency operation four-way valve;
and the compressor high-frequency operation fault clearing unit is used for clearing the reversing abnormal fault of the compressor high-frequency operation four-way valve.
In the embodiment, whether the four-way valve reversing meets the reversing abnormity pre-judging condition is judged through the first judging module, the second judging module detects preset system data of a system to which the four-way valve belongs when the reversing abnormity pre-judging condition is met, whether the four-way valve reversing meets the reversing abnormity accurate judging condition is judged according to the system data, the judging module judges that the four-way valve is abnormal in reversing when the reversing abnormity accurate judging condition is met, the four-way valve reversing abnormity diagnosis under various operation modes under all working conditions can be realized, the four-way valve reversing abnormity is secondarily judged through setting the reversing abnormity pre-judging condition and the reversing abnormity accurate judging condition, the occurrence of the four-way valve reversing abnormity error protection action is prevented, and the fault rate of the system is reduced.
The present embodiment provides an air-source heat pump system, including: the four-way valve commutation abnormality diagnosis control device according to the above embodiment.
In some embodiments, an air-source heat pump system comprises:
the water side system is used for acquiring a pre-judgment condition parameter of the reversing abnormity;
and the fluorine side system is used for acquiring the abnormal accurate judgment condition parameters of the reversing.
It should be noted that the four-way valve commutation abnormality diagnosis control method, the four-way valve commutation abnormality diagnosis control and the air source heat pump system belong to a general inventive concept, and the contents in the four-way valve commutation abnormality diagnosis control method, the four-way valve commutation abnormality diagnosis control and the air source heat pump system embodiment are mutually applicable.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present application, the meaning of "a plurality" means at least two unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and the scope of the preferred embodiments of the present application includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
It should be noted that the present invention is not limited to the above-mentioned preferred embodiments, and those skilled in the art can obtain other products in various forms without departing from the spirit of the present invention, but any changes in shape or structure can be made within the scope of the present invention with the same or similar technical solutions as those of the present invention.
Claims (21)
1. A four-way valve reversing abnormity diagnosis control method is characterized by comprising the following steps:
judging whether the four-way valve meets a pre-judgment condition for abnormal reversing or not;
if the reversing abnormity pre-judgment condition is met, detecting preset system data of a system to which the four-way valve belongs, and judging whether reversing of the four-way valve meets the reversing abnormity accurate judgment condition according to the system data;
and if the accurate judgment condition of the reversing abnormity is met, judging that the reversing of the four-way valve is abnormal.
2. The method for diagnosing and controlling the reversing abnormality of the four-way valve according to claim 1, wherein the preset system data includes: one or more of an ambient temperature value, a defrost temperature value, a liquid tube temperature value.
3. The method for diagnosing and controlling the reversing abnormality of the four-way valve according to claim 2, wherein the preset system data includes an environmental temperature value, a defrosting temperature value and a liquid pipe temperature value, and the step of judging whether the reversing of the four-way valve meets a reversing abnormality accurate judgment condition according to the system data includes:
and if the defrosting temperature value is greater than the environmental temperature value, and the difference value between the defrosting temperature value and the liquid pipe temperature value is greater than a preset threshold value, judging that the reversing of the four-way valve meets the reversing abnormal accurate judgment condition.
4. The method for diagnosing and controlling the reversing abnormality of the four-way valve according to claim 1, wherein the step of judging whether the reversing of the four-way valve meets a reversing abnormality pre-judging condition comprises the steps of:
detecting a water inlet temperature value and a water outlet temperature value of a system to which the four-way valve belongs, determining a preset temperature difference, and if the difference value of the water inlet temperature value and the water outlet temperature value is larger than the preset temperature difference;
and/or the presence of a gas in the gas,
detecting a temperature drop rate value of the outlet water temperature of a system to which the four-way valve belongs, and if the temperature drop rate value is greater than or equal to a temperature drop rate value default value;
then the four-way valve is judged to be switched to meet the condition of abnormal switching judgment in advance.
5. The four-way valve commutation abnormality diagnostic control method of claim 4, wherein the determining a predetermined temperature difference comprises:
calculating the difference value between the inlet water temperature value and the outlet water temperature value to obtain the current inlet and outlet water temperature difference;
and determining the smaller value between the current water inlet and outlet temperature difference and a preset water inlet and outlet temperature difference default value as a preset temperature difference.
6. The method for diagnosing and controlling the reversing abnormality of the four-way valve according to claim 1, wherein before judging whether the reversing of the four-way valve satisfies a reversing abnormality pre-judging condition, the method further comprises:
judging whether the unit running state meets the initial running condition at the same time, wherein the initial running condition comprises the following steps: when the unit operates in the heating mode, the compressor is in an operating state and the four-way valve is in a power-on state;
and after the initial operation condition is met, judging whether the four-way valve meets a reversing abnormity pre-judgment condition or not.
7. The method for diagnosing and controlling a four-way valve commutation abnormality according to claim 1, further comprising, after determining that the four-way valve commutation abnormality:
clearing the abnormal reversing fault of the four-way valve;
judging whether the four-way valve reversing meets a reversing abnormity pre-judgment condition or not after the clearing operation is executed;
if the reversing abnormity pre-judgment condition is met, judging whether the reversing of the four-way valve meets the reversing abnormity accurate judgment condition;
if the accurate judgment condition of the reversing abnormity is met, the reversing abnormity of the four-way valve is judged, the unit executes fault shutdown, and fault locking is carried out.
8. The method for diagnosing and controlling the reversing abnormality of the four-way valve according to claim 7, wherein the operation of clearing the reversing abnormality fault of the four-way valve comprises:
and clearing the abnormal reversing fault of the low-frequency running four-way valve of the compressor and the abnormal reversing fault of the high-frequency running four-way valve of the compressor.
9. The method for diagnosing and controlling the reversing abnormality of the four-way valve according to claim 8, wherein the operation of clearing the reversing abnormality fault of the compressor low-frequency operation four-way valve comprises the following steps:
judging whether the current operating frequency meets a first frequency requirement, if so, adjusting the current opening of the electronic expansion valve;
after the current opening degree of the electronic expansion valve is adjusted, the four-way valve is subjected to power-down reversing;
performing frequency boosting operation on the frequency of the compressor according to a first preset frequency boosting value;
and performing secondary reversing of the power-on of the four-way valve after the frequency boosting operation is performed.
10. The method of diagnosing and controlling a four-way valve commutation abnormality of claim 9, wherein the first frequency requirement comprises: the current operating frequency is not greater than a first preset frequency value.
11. The method for diagnosing and controlling the reversing abnormality of the four-way valve according to claim 9, wherein after the four-way valve is electrified for the second reversing, the method further comprises the following steps:
judging whether the reversing of the four-way valve meets a reversing abnormity accurate judgment condition;
if the frequency does not meet the preset frequency increasing value, the frequency of the compressor is increased according to the second preset frequency increasing value after the preset second reversing time is waited;
and circularly executing the clearing operation of the reversing abnormal fault of the low-frequency running four-way valve of the compressor until the preset circulating execution times or fault clearing is reached.
12. The method for diagnosing and controlling the reversing abnormality of the four-way valve according to claim 11, further comprising, after a preset number of execution cycles is reached:
judging whether the current running frequency meets a second frequency requirement, if so, adjusting the gear of the fan and then powering on the four-way valve to forcibly reverse;
after the second reversing time is preset, the four-way valve is switched over in a power-down mode, and meanwhile the fan is stopped;
after the fan is stopped and the preset second reversing time is passed, the four-way valve is electrified to be forcibly reversed;
if the accurate judgment condition of the abnormal reversing is still met, the unit displays the blocking fault of the four-way valve, and the unit stops due to the fault and operates in a fault locking mode.
13. The method of diagnosing and controlling a four-way valve commutation abnormality of claim 12, wherein the second frequency requirement comprises: the sum of the current operating frequency and the second preset frequency value is not greater than the third preset frequency value.
14. The method for diagnosing and controlling the reversing abnormality of the four-way valve according to claim 8, wherein the operation of clearing the reversing abnormality fault of the compressor high-frequency operation four-way valve comprises:
judging whether the current operating frequency meets the third frequency requirement, if so, executing fault shutdown of the unit, and closing the electronic expansion valve;
after the unit executes the fault shutdown preset time, the frequency of the compressor is boosted according to a third preset boosting value;
adjusting the opening of the electronic expansion valve;
after the opening of the electronic expansion valve is adjusted, the four-way valve is reversed.
15. The method of diagnosing and controlling a four-way valve commutation abnormality of claim 14, wherein the third frequency requirement includes: the current operating frequency is greater than a first preset frequency value.
16. The method for diagnosing and controlling a four-way valve commutation abnormality according to claim 14, further comprising, after the four-way valve commutation operation:
judging whether the reversing of the four-way valve meets a reversing abnormity accurate judgment condition;
if the fault is not met, circularly executing the clearing operation of the reversing abnormal fault of the high-frequency operation four-way valve of the compressor until the preset circulating execution times or fault clearing is reached;
after the preset cycle execution times are reached, if the reversing abnormity accurate judgment condition is still met, the unit displays the four-way valve blocking fault, and the unit stops the machine due to the fault and operates in a fault locking mode.
17. The method for diagnosing and controlling the reversing abnormality of the four-way valve according to any one of claims 8 to 16, wherein if it is determined that the precise determination condition for the reversing abnormality is not satisfied, the method further comprises:
and clearing the detection zone bit of the abnormal reversing fault of the four-way valve.
18. The method for diagnosing and controlling the reversing abnormality of the four-way valve according to claim 5, further comprising:
the method for estimating the current water inlet and outlet temperature difference specifically comprises the following steps:
estimating the maximum output frequency of the unit according to the current operating environment temperature, the water inlet temperature and the water outlet temperature;
obtaining the current output frequency according to the maximum output frequency;
acquiring the regulated water flow of the current water pump;
and estimating the current water inlet and outlet temperature difference according to the current output frequency and the regulated water flow of the current water pump.
19. A four-way valve reversing abnormality diagnosis control device is characterized by comprising:
the first judgment module is used for judging whether the reversing of the four-way valve meets a reversing abnormity pre-judgment condition or not;
the second judgment module is used for detecting preset system data of a system to which the four-way valve belongs when the reversing abnormity pre-judgment condition is met, and judging whether reversing of the four-way valve meets the reversing abnormity accurate judgment condition or not according to the system data;
and the judging module is used for judging that the four-way valve is abnormal in reversing when the accurate reversing judgment condition is met.
20. An air-source heat pump system, comprising: the apparatus for diagnosing and controlling a commutation abnormality of a four-way valve according to claim 19.
21. The air-source heat pump system of claim 20, wherein the air-source heat pump system comprises:
the water side system is used for acquiring a pre-judgment condition parameter of the reversing abnormity;
and the fluorine side system is used for acquiring the abnormal accurate judgment condition parameters of the reversing.
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| CN114440408A (en) * | 2021-12-09 | 2022-05-06 | 海信（山东）空调有限公司 | Four-way valve control method and device for multi-split air conditioner and multi-split air conditioner |
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