CN113465114B - Control method and device for preventing low-voltage error protection and air conditioner - Google Patents
Control method and device for preventing low-voltage error protection and air conditioner Download PDFInfo
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- CN113465114B CN113465114B CN202110555188.6A CN202110555188A CN113465114B CN 113465114 B CN113465114 B CN 113465114B CN 202110555188 A CN202110555188 A CN 202110555188A CN 113465114 B CN113465114 B CN 113465114B
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—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
- F24F11/65—Electronic processing for selecting an operating mode
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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
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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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
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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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
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/87—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units
- F24F11/871—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units by controlling outdoor fans
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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
- F24F11/88—Electrical aspects, e.g. circuits
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a control method and a control device for preventing low-voltage error protection and an air conditioner, and relates to the technical field of air conditioners, wherein the control method for preventing low-voltage error protection comprises the following steps: acquiring outdoor environment temperature, and detecting whether a target air conditioner enters a refrigeration mode or not when the outdoor environment temperature is less than or equal to a preset temperature; when the refrigeration mode starting stage of the target air conditioner is finished, detecting whether the target air conditioner enters a low-pressure switch protection action within a first preset time length; if so, restarting the target air conditioner to enable the target air conditioner to quit the protection action of the low-pressure switch when the low-pressure error protection occurs. The invention can avoid the influence of the target air conditioner on the refrigeration of the air conditioner due to the falling into the protection action of the low-pressure switch, and improves the refrigeration reliability of the target air conditioner in a low-temperature environment.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method and device for preventing low-voltage error protection and an air conditioner.
Background
At present, when the outdoor environment temperature is lower in a transition season, the condition of refrigerating by using an air conditioner still exists, when the air conditioner starts a running refrigeration mode under the condition of lower outdoor environment temperature, the problem that the compressor, the outer fan and the throttle valve are unmatched in linkage adjustment at the starting stage is easily caused by overlarge pressure drop of a connecting pipe of the air conditioner, the low-pressure of the compressor is lower, the low-pressure error protection is easily caused, the refrigeration effect of the air conditioner is influenced, and the refrigeration reliability of the air conditioner at the low temperature is reduced.
Disclosure of Invention
In order to solve the above problems, the present invention provides a control method and device for preventing low-voltage error protection, and an air conditioner, which can prevent a target air conditioner from falling into a low-voltage switch protection action to affect air conditioner refrigeration, and improve the reliability of the target air conditioner in refrigeration in a low-temperature environment.
According to an embodiment of the present invention, on the one hand, a control method for preventing low voltage error protection is provided, which includes: acquiring the outdoor environment temperature, and detecting whether a target air conditioner enters a refrigeration mode or not when the outdoor environment temperature is less than or equal to a preset temperature; when the refrigeration mode starting stage of the target air conditioner is finished, detecting whether the target air conditioner enters a low-pressure switch protection action within a first preset time length; and if so, restarting the target air conditioner to enable the target air conditioner to exit from the low-pressure switch protection action when the low-pressure error protection occurs.
By adopting the technical scheme, when the target air conditioner enters the low-pressure switch protection action, the target air conditioner is controlled to be restarted, the target air conditioner can be prevented from being trapped in the low-pressure switch protection action to influence the refrigeration of the air conditioner, the target air conditioner can be timely recovered to normally operate when the low-pressure error protection action occurs, and the refrigeration reliability of the target air conditioner in a low-temperature environment is improved.
Preferably, the step of detecting whether the target air conditioner enters a low-pressure switch protection action within a first preset time period includes: detecting the opening and closing state of a low-pressure switch of the target air conditioner within the first preset time period; and when the on-off state is the off state, determining that the target air conditioner enters a low-pressure switch protection action.
Through adopting above-mentioned technical scheme, detect low pressure switch's switching state, can accurately detect whether air conditioning unit gets into low pressure switch protection, promoted the accuracy that prevents air conditioner low pressure mistake protection.
Preferably, the step of controlling the restart of the target air conditioner includes: step a, obtaining the starting wind shields of the internal and external fans and the running opening of the throttle expansion valve of the target air conditioner in the starting stage; step b, reducing a preset windshield of the starting windshield to obtain a target windshield of the outer fan, and increasing the running opening by a preset opening to obtain a target opening of the throttle expansion valve; and c, controlling the compressor, the outer fan and the throttle expansion valve of the target air conditioner to restart at the minimum frequency, the target windshield and the target opening respectively.
Through adopting above-mentioned technical scheme, reduce outer fan windscreen and increase throttle expansion valve's aperture at restart in-process, can reduce the heat transfer ability of off-premises station, promote high pressure, and then can promote low pressure, avoided setting up unreasonable because of the initial start stage coordinated control parameter, lead to low pressure mistake protection problem, promoted the reliability of air conditioner operation.
Preferably, the control method for preventing low-voltage false protection further includes: and d, when the target air conditioner is restarted and runs for a second preset time length, detecting the opening and closing state of a low-pressure switch of the target air conditioner so as to judge whether the target air conditioner has low-pressure error protection.
Through adopting above-mentioned technical scheme, judge once more after target air conditioner restarts a period whether get into the pressure switch protection action, can judge whether the disconnection of low pressure switch is low pressure mistake protection after the initial start refrigeration mode according to low pressure switch's current state, avoid influencing the air conditioner refrigeration because of low pressure mistake protection, promoted user experience.
Preferably, the control method for preventing low-voltage false protection further includes: and e, when the opening and closing state is still in the off state, taking the target windshield as a new starting windshield, taking the target opening as a new running opening, returning to execute the step b until the target windshield is a zero windshield or the target opening reaches a preset maximum opening, and determining that the target air conditioner is normal low-voltage protection.
By adopting the technical scheme, when the air conditioner enters the low-pressure switch for protection action, the air conditioner is restarted repeatedly under the conditions that the target windshield of the outer fan is not a zero windshield and the target opening does not reach the preset maximum opening, so that the air conditioner is ensured not to enter the error protection action, and the control precision of the air conditioner for preventing the low-pressure error protection is improved.
Preferably, the control method for preventing low-voltage false protection further includes: and when the opening and closing state is the closing state, determining that the target air conditioner has low-voltage error protection, and taking the minimum frequency, the target windshield and the target opening as starting parameters so as to enable the target air conditioner to operate based on the starting parameters when the target air conditioner starts the refrigeration mode again.
By adopting the technical scheme, the minimum frequency, the target windshield and the target opening degree which can not lead to the disconnection of the low-pressure switch are used as next starting parameters, the phenomenon that the target air conditioner is subjected to low-pressure error protection again due to the fact that the starting parameters are inaccurate can be avoided, and the running reliability of starting the air conditioner for refrigeration in a low-temperature environment is improved.
Preferably, the control method for preventing low-voltage false protection further includes: and when the target windshield is a zero windshield or the target opening reaches a preset maximum opening, determining that the target air conditioner is normal low-pressure protection, controlling the low-pressure switch to keep a disconnection state, and sending a low-pressure switch protection prompt.
By adopting the technical scheme, when the normal protection phenomenon that the low-pressure switch is disconnected into the target air conditioner is determined, the low-pressure switch protection is reported, the user air conditioner can be prompted to be in the low-pressure switch protection, the maintenance personnel is waited to maintain, the air conditioner refrigeration is avoided being influenced, and the user experience is improved.
According to an embodiment of the present invention, another aspect provides a control device for preventing low voltage error protection, including: the acquisition module is used for acquiring the outdoor environment temperature; the first detection module is used for detecting whether the target air conditioner enters a refrigeration mode or not when the outdoor environment temperature is less than or equal to a preset temperature; the second detection module is used for detecting whether the target air conditioner enters a low-pressure switch protection action within a first preset time length or not when the refrigeration mode starting stage of the target air conditioner is finished; and the control module is used for restarting the target air conditioner when detecting that the target air conditioner enters a low-pressure switch protection action within a first preset time period, so that the target air conditioner exits the low-pressure switch protection action when low-pressure error protection occurs.
According to an embodiment of the present invention, in another aspect, there is provided an air conditioner including a computer readable storage medium storing a computer program and a processor, the computer program being read by the processor and when executed, implementing the method according to any one of the first aspect.
According to an embodiment of the present invention, another aspect provides a computer-readable storage medium, in which a computer program is stored, and the computer program is read and executed by a processor to implement the method according to any one of the first aspect.
The invention has the following beneficial effects: whether the low-pressure switch protection action is executed or not is detected within a first time after the target air conditioner is started, and when the target air conditioner enters the low-pressure switch protection action, the target air conditioner is controlled to be restarted, so that the target air conditioner is prevented from being trapped in the low-pressure switch protection action to influence air conditioner refrigeration, normal operation of the target air conditioner can be timely restored when the low-pressure error protection action occurs, and the refrigeration reliability of the target air conditioner in a low-temperature environment is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary and that other implementation drawings may be derived from the provided drawings by those of ordinary skill in the art without inventive effort.
The structures, the proportions, the sizes, and the like shown in the specification are only used for matching with the contents disclosed in the specification, so that those skilled in the art can understand and read the present invention, and do not limit the conditions for implementing the present invention, so that the present invention has no technical essence, and any modifications of the structures, changes of the proportion relation, or adjustments of the sizes, should still fall within the scope of the technical contents disclosed in the present invention without affecting the efficacy and the achievable purpose of the present invention.
FIG. 1 is a flow chart of a control method for preventing low voltage error protection according to the present invention;
FIG. 2 is a logic diagram of a low voltage protection adaptive control provided by the present invention;
fig. 3 is a schematic structural diagram of a control device for preventing low-voltage error protection according to the present invention.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
The present embodiment provides a control method for preventing low voltage error protection, which can be applied to a controller of a target air conditioner, referring to a flowchart of the control method for preventing low voltage error protection shown in fig. 1, the method mainly includes the following steps S102 to S106:
step S102: and acquiring the outdoor environment temperature, and detecting whether the target air conditioner enters a refrigeration mode or not when the outdoor environment temperature is less than or equal to a preset temperature.
The method comprises the steps that an outdoor environment temperature corresponding to a target air conditioner is detected based on a real-time temperature sensor, when the outdoor environment temperature is smaller than or equal to a preset temperature, the target air conditioner is determined to be in a low-temperature environment, whether the target air conditioner receives a refrigerating mode entering instruction input by a user is further detected, and when the refrigerating mode entering instruction is received, the target air conditioner is determined to be in low-temperature refrigeration. The preset temperature can be a temperature which enables the target air conditioner to be easily subjected to low-pressure error protection in a transition season, the value range of the preset temperature can be 21-32 ℃, and the optimal value can be 27 ℃.
Step S104: when the refrigeration mode starting stage of the target air conditioner is finished, whether the target air conditioner enters a low-pressure switch protection action within a first preset time is detected.
When the target air conditioner enters a refrigeration mode and the starting stage of the refrigeration mode is started to be finished, whether the target air conditioner has a low-pressure switch protection action within a first preset time period or not is detected based on the timer, namely whether the target air conditioner is disconnected due to the fact that the low-pressure value of the air suction end of the compressor is low or not is detected. The value range of the first preset duration can be 1-10 min, and the preferred value is 5min. In a cooling mode start-up stage of the target air conditioner, the compressor is operated at a fixed frequency, the outer fan is operated at a fixed windshield, and the throttle expansion valve is operated at a fixed opening degree.
Step S106: if so, restarting the target air conditioner to enable the target air conditioner to quit the protection action of the low-pressure switch when the low-pressure error protection occurs.
When the target air conditioner executes the low-pressure switch protection action within the first time after the refrigeration mode starting stage is finished, in order to avoid the condition that the air conditioner enters the low-pressure error protection action due to unreasonable setting of linkage control parameters of a compressor, an outer fan windshield and a throttle expansion valve in the starting stage, the target air conditioner is controlled to change parameters to restart so as to judge whether the target air conditioner enters the low-pressure error protection after the starting stage according to the low-pressure switch state after restarting, the target air conditioner can automatically quit the low-pressure switch protection action by restarting the target air conditioner, and the condition that the refrigeration of the air conditioner is influenced due to the fact that the target air conditioner falls into the low-pressure switch protection action is avoided.
According to the control method for preventing low-voltage error protection, whether the low-voltage pressure switch protection action is executed or not is detected within the first time after the target air conditioner is started, and when the target air conditioner enters the low-voltage pressure switch protection action, the target air conditioner is controlled to restart, so that the problem that the target air conditioner is trapped in the low-voltage pressure switch protection action to influence air conditioner refrigeration can be avoided, normal operation of the target air conditioner can be timely recovered when the low-voltage error protection action occurs, and the refrigeration reliability of the target air conditioner in a low-temperature environment is improved.
Considering that the air conditioner easily appears low pressure mistake protection phenomenon when starting the refrigeration mode under low temperature environment, in order to promote the stability of air conditioner operation, this embodiment provides the concrete implementation mode that whether detection target air conditioner gets into the low pressure switch protection action within a first preset duration: detecting the opening and closing state of a low-pressure switch of a target air conditioner within a first preset time period; and when the on-off state is the off state, determining that the target air conditioner enters a low-pressure switch protection action.
When the low-pressure value of the air suction side of the compressor is less than or equal to 0.05 +/-0.05 MPa, the low-pressure switch is switched off, and the air conditioning unit reports the protection of the low-pressure switch; and when the low-pressure value is more than or equal to 0.15 +/-0.05 MPa, the low-pressure switch is closed, and the air conditioning unit cancels the protection of the low-pressure switch. Whether the air conditioning unit enters the low-pressure switch for protection can be accurately detected by detecting the opening and closing state of the low-pressure switch, and the accuracy of preventing the low-pressure error protection of the air conditioner is improved.
And detecting the current on-off state of the low-pressure switch in real time within a first preset time when the target air conditioner finishes the refrigeration mode starting stage, determining that the target air conditioner enters the low-pressure switch protection action when the low-pressure switch is switched to the off state, and further carrying out restart control on the target air conditioner so as to avoid the condition that the low-pressure switch is switched off and is in low-pressure error protection. And when the low-pressure switch is kept in a closed state, determining that the target air conditioner does not enter a low-pressure switch protection action.
In consideration of the fact that the air conditioner is prone to low-pressure error protection in the low-temperature refrigeration starting stage, the present embodiment provides an implementation manner of restarting control on a target air conditioner, which may be specifically executed with reference to the following steps a to e:
step a, obtaining the starting windshield of an internal fan and an external fan of the target air conditioner in the starting stage and the running opening of a throttle expansion valve.
When the target air conditioner is in a refrigeration mode starting stage, the compressor is started by a fixed frequency value, the windshield of the outer fan is a fixed windshield, the throttle expansion valve runs by a fixed opening degree, and the starting windshield of the outer fan and the running opening degree of the throttle expansion valve in the starting stage are detected.
And step b, reducing the starting windshield by the preset windshield to obtain a target windshield of the outer fan, and increasing the operation opening by the preset opening to obtain a target opening of the throttle expansion valve.
When the target air conditioner has a low-pressure switch protection action, the starting windshield of the outer fan is lowered by the preset windshield on the basis of the current gear, the windshield with the starting windshield lowered by the preset windshield is used as the target windshield, and the opening of the throttle expansion valve in the starting stage after the operation opening is increased by the preset opening is used as the target opening.
The preset damper may be a damper such as a low damper obtained by lowering a middle damper by one when a start damper of the outer fan in a start-up stage is a middle damper. The preset opening may be an opening variation value that can significantly vary the low pressure, such as c × m, where m is an opening range of the throttle expansion valve, and c has a value ranging from 5% to 15%, preferably 10%.
And c, controlling the compressor, the outer fan and the throttle expansion valve of the target air conditioner to restart at the minimum frequency, the target windshield and the target opening degree respectively.
And after the low-pressure switch of the target air conditioner is disconnected, controlling the target air conditioner to restart, namely controlling the compressor to run at the minimum frequency, controlling the outer fan to run at a target windshield, and controlling the throttle expansion valve to run at a target opening degree so as to restart the target air conditioner to run. The minimum frequency is the lowest operating frequency of the compressor and is determined according to the operating range of the frequency of the compressor.
Through reducing outer fan windscreen and increase throttle expansion valve's aperture at restart in-process, can reduce the heat transfer ability of off-premises station, promote high pressure, and then can promote low pressure, avoided setting up unreasonable because of initial start-up stage coordinated control parameter, lead to low pressure mistake protection problem.
And d, when the target air conditioner is restarted and runs for a second preset time length, detecting the opening and closing state of a low-pressure switch of the target air conditioner so as to judge whether the target air conditioner has low-pressure error protection.
And recording the restarting operation time of the target air conditioner based on the timer, and judging whether the target air conditioner enters a low-pressure switch protection action or not again when the restarting operation time of the target air conditioner reaches a second preset time length, namely judging whether the low-pressure switch is in a disconnected state or not. The value range of the second preset duration can be 1-9 min, and the preferred value is 5min.
Whether the low-pressure switch enters a pressure switch protection action or not is judged again after the target air conditioner is restarted for a period of time, whether the low-pressure switch is disconnected after the refrigeration mode is started for the first time or not is judged to be low-pressure error protection or not according to the current state of the low-pressure switch, the air conditioner refrigeration is prevented from being influenced due to the low-pressure error protection, and the user experience is improved.
And e, when the opening and closing state is still in a disconnection state, taking the target windshield as a new starting windshield, taking the target opening as a new running opening, returning to the step b until the target windshield is a zero windshield or the target opening reaches a preset maximum opening, and determining that the target air conditioner is in normal low-voltage protection.
In order to prevent the compressor from being damaged by liquid impact caused by the overlarge opening degree of the throttle expansion valve, the preset maximum opening degree may be k × m, wherein the value of k may range from 30% to 50%, and the preferred value is 40%.
And when the target air conditioner is restarted and operated for the second preset time length, and the low-pressure switch at the air suction end of the compressor is still in an off state, returning to execute the step b to restart the target air conditioner, controlling the windshield of the outer fan to reduce the preset windshield to restart on the basis of the current target windshield, controlling the compressor to start at the minimum frequency, controlling the throttle expansion valve to increase the preset opening degree on the basis of the target opening degree to restart, judging the on-off state of the low-pressure switch after restarting the target air conditioner again, namely controlling the target air conditioner to restart when detecting that the low-pressure switch is in the off state each time until the windshield of the outer fan is zero or the opening degree of the throttle expansion valve reaches the preset maximum opening degree when restarting control is carried out, namely the windshield of the outer fan cannot be reduced any more, the throttle opening degree cannot be increased again, the target air conditioner is not restarted to control, and judging that the low-pressure switch is off to be in a normal protection phenomenon.
In a specific embodiment, when the target windshield is a zero windshield or the target opening reaches a preset maximum opening, the target air conditioner is determined to be in normal low-pressure protection, the low-pressure switch is controlled to keep an off state, and a low-pressure switch protection prompt is sent out. When the target air conditioner is restarted for multiple times, the target windshield is a zero windshield or the target opening degree reaches the preset maximum opening degree, but the low-pressure switch is still in a disconnected state, the low-pressure switch is determined to be disconnected as the normal protection phenomenon of the target air conditioner, and reporting the protection of the low-voltage pressure switch to prompt a user that the air conditioner is in the protection of the low-voltage pressure switch, waiting for a maintainer to overhaul, keeping the low-voltage pressure switch in a disconnected state, and recovering the low-voltage pressure switch when the air conditioner is powered off again.
In a possible embodiment, the control method for preventing the low voltage error protection further includes the following steps:
and f, when the opening and closing state is the closing state, determining that the target air conditioner has low-voltage error protection, and taking the minimum frequency, the target windshield and the target opening as starting parameters so as to enable the target air conditioner to run based on the starting parameters when the refrigeration mode is started again.
When the target air conditioner is restarted, the target air conditioner is not protected by a low-pressure switch, namely the low-pressure switch is in a closed state after the target air conditioner is restarted, the phenomenon that the target air conditioner has low-pressure error protection after a refrigeration mode is started for the first time is determined, the target windshield of an outer fan and the target opening degree of a throttle expansion valve during the last restarting are recorded, the minimum frequency, the target windshield and the target opening degree are used as starting parameters of the target air conditioner to be stored, and when the refrigeration mode is restarted by the target air conditioner under the condition that the outdoor environment is less than or equal to the preset temperature, the compressor, the outer fan and the throttle expansion valve of the target air conditioner are controlled to be started and operated according to the starting parameters in the starting stage.
When the low-voltage error protection of the target air conditioner is determined, the minimum frequency which cannot lead to the disconnection of the low-voltage pressure switch, the target windshield and the target opening degree are used as next starting parameters, the phenomenon that the target air conditioner is subjected to the low-voltage error protection again due to the fact that the starting parameters are inaccurate can be avoided, and the running reliability of the air conditioner in the low-temperature environment for starting refrigeration is improved.
The control method for preventing the low-pressure error protection can solve the problem of low-pressure error protection easily caused when the air conditioner enters a refrigeration mode in a low-temperature environment, improves the running reliability of the air conditioning unit, and can effectively avoid the problem of error protection of low-pressure switch protection caused by unreasonable setting of linkage control parameters in a starting stage.
Corresponding to the control method for preventing low-voltage false protection provided in the foregoing embodiment, an embodiment of the present invention provides an example of performing low-voltage protection adaptive control on an air conditioner by applying the control method for preventing low-voltage false protection, referring to a low-voltage protection adaptive control logic diagram shown in fig. 2, and specifically referring to the following steps S201 to S208:
step S201: when the air conditioner detects the protection of the low-pressure switch in the starting stage, and the outdoor environment temperature is less than or equal to the preset temperature.
Step S202: and judging whether the time is within a minutes after the starting stage is ended. If yes, step S203 is executed, and if no, step S204 is executed.
Step S203: and controlling the air conditioner to restart.
In the process of controlling the air conditioner to restart, the compressor runs according to the lowest frequency Pmin Hz, the outer fan runs by reducing one windshield (taking the windshield behind the reduced windshield as a target windshield) on the basis of the starting stage, the opening of the throttle expansion valve is increased by c m (taking the opening after the opening is increased as the target opening) on the basis of the starting stage, and the opening of the throttle expansion valve is required to be smaller than the preset maximum opening k m.
Step S204: and exiting the low-voltage error protection control of the air conditioner and executing the control according to the conventional protection control.
And when the outdoor environment temperature is higher than the preset temperature or a minute after the starting stage is finished, if the low-pressure switch protection action occurs, executing the protection according to the conventional protection control, namely judging that the protection phenomenon is normal, and waiting for maintenance. a may take on a value of 5.
Step S205: and when the air conditioner is restarted and operates for the second preset time length, judging whether the low-pressure switch is in an off state or not. If yes, step S206 is performed, and if no, step S207 is performed.
Step S206: and judging whether the target windshield of the outer fan is the lowest windshield or whether the throttle expansion valve reaches the maximum preset opening degree, if not, returning to the step S203, and if so, executing the step S208.
Step S207: and storing the current target windshield and the target opening as starting parameters.
And memorizing the control parameters of each component which normally operates at the moment, namely the frequency P1 of the compressor, the target windshield Q1 of the outer fan and the target opening M1 of the throttle expansion valve, and subsequently controlling the air conditioner to start and operate according to the starting parameters when the temperature of the outer ring is in the interval. If the low-pressure switch still has protection action in the subsequent operation of the air conditioner, the normal protection phenomenon is judged, and the maintenance is waited.
Step S208: and judging the normal protection phenomenon, and reporting the protection of the low-voltage pressure switch to wait for maintenance.
Corresponding to the control method for preventing low-voltage error protection provided by the above embodiment, the embodiment of the present invention provides a control device for preventing low-voltage error protection, which can be applied to a controller of a target air conditioner, and refer to a structural schematic diagram of the control device for preventing low-voltage error protection shown in fig. 3, and the device includes the following modules:
the obtaining module 31 is configured to obtain an outdoor ambient temperature.
The first detecting module 32 is configured to detect whether the target air conditioner enters a cooling mode when the outdoor environment temperature is less than or equal to a preset temperature.
The second detecting module 33 is configured to detect whether the target air conditioner enters a low-pressure switch protection action within a first preset time period when the refrigeration mode starting stage of the target air conditioner is ended.
The control module 34 is configured to, when it is detected that the target air conditioner enters the low-pressure switch protection action within a first preset time period, perform restart control on the target air conditioner, so that the target air conditioner exits the low-pressure switch protection action when low-pressure error protection occurs.
The above-mentioned controlling means who prevents low pressure mistake protection that this embodiment provided detects whether to have executed the low pressure switch protection action within a long time after the start-up of target air conditioner to when the target air conditioner gets into the low pressure switch protection action, carry out restart control to the target air conditioner, can avoid the target air conditioner to sink into in the low pressure switch protection action and influence the air conditioner refrigeration, can also make the target air conditioner in time resume normal operating when the low pressure mistake protection action appears, the refrigerated reliability of target air conditioner under low temperature environment has been promoted.
In an embodiment, the second detecting module 33 is further configured to detect an open/close state of a low pressure switch of the target air conditioner within a first preset time period; and when the on-off state is the off state, determining that the target air conditioner enters a low-pressure switch protection action.
In one embodiment, the control module 34 includes:
and the acquisition unit is used for acquiring the starting windshield of the internal and external fans and the operation opening of the throttle expansion valve of the target air conditioner in the starting stage.
And the first adjusting unit is used for reducing the starting windshield by a preset windshield to obtain a target windshield of the outer fan and increasing the running opening by a preset opening to obtain a target opening of the throttle expansion valve.
And the control unit is used for controlling the compressor, the outer fan and the throttle expansion valve of the target air conditioner to be restarted at the minimum frequency, the target windshield and the target opening degree respectively.
And the detection unit is used for detecting the opening and closing state of a low-pressure switch of the target air conditioner when the target air conditioner is restarted and runs for a second preset time length so as to judge whether the target air conditioner has low-pressure error protection.
And the second adjusting unit is used for taking the target windshield as a new starting windshield and the target opening as a new running opening when the opening and closing state is still in a disconnection state, inputting the new starting windshield and the new running opening into the first adjusting unit until the target windshield is a zero windshield or the target opening reaches a preset maximum opening, and determining that the target air conditioner is in normal low-voltage protection.
And the parameter determining unit is used for determining that the target air conditioner has low-voltage error protection when the opening and closing state is the closing state, and taking the minimum frequency, the target windshield and the target opening as starting parameters so as to enable the target air conditioner to operate based on the starting parameters when the refrigeration mode is restarted.
And the prompting unit is used for determining that the target air conditioner is normal low-voltage protection, controlling the low-voltage pressure switch to keep a disconnected state and sending out a low-voltage pressure switch protection prompt when the target windshield is a zero windshield or the target opening reaches a preset maximum opening.
The above-mentioned controlling means who prevents low pressure error protection that this embodiment provided can solve the air conditioner and get into the problem of low pressure error protection that appears easily when the mode under low temperature environment, has promoted the reliability of air conditioning unit operation, can effectively avoid because of the start-up stage linkage control parameter sets up unreasonablely, the error protection problem of low pressure switch protection that appears.
Corresponding to the control method for preventing low-voltage error protection provided by the above embodiment, the present embodiment provides an air conditioner, which includes a computer readable storage medium storing a computer program and a processor, wherein when the computer program is read and executed by the processor, the control method for preventing low-voltage error protection provided by the above embodiment is implemented.
The present embodiment further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements the processes of the control method for preventing low-voltage error protection, and can achieve the same technical effects, and in order to avoid repetition, details are not repeated here. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
Of course, those skilled in the art can understand that all or part of the processes in the methods according to the above embodiments may be implemented by instructing a control device to implement the methods according to the above embodiments by a computer, and the program may be stored in a computer-readable storage medium, and when executed, the program may include the processes according to the above method embodiments, where the storage medium may be a memory, a magnetic disk, an optical disk, or the like.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected by one skilled in the art without departing from the spirit and scope of the invention, as defined in the appended claims.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The control device for preventing low-voltage error protection and the air conditioner disclosed by the embodiment correspond to the control method for preventing low-voltage error protection disclosed by the embodiment, so that the description is relatively simple, and relevant parts can be referred to the description of the method part.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. A control method for preventing low-voltage error protection is characterized by comprising the following steps:
acquiring the outdoor environment temperature, and detecting whether a target air conditioner enters a refrigeration mode or not when the outdoor environment temperature is less than or equal to a preset temperature;
when the starting stage of the refrigeration mode of the target air conditioner is finished, detecting whether the target air conditioner enters a low-pressure switch protection action within a first preset time period;
if so, restarting the target air conditioner to enable the target air conditioner to quit the protection action of the low-pressure switch when low-pressure error protection occurs;
the step of controlling the restart of the target air conditioner includes: step a, obtaining the starting wind shields of the internal and external fans and the running opening of the throttle expansion valve of the target air conditioner in the starting stage;
step b, reducing a preset windshield of the starting windshield to obtain a target windshield of the outer fan, and increasing the running opening by a preset opening to obtain a target opening of the throttle expansion valve;
and c, controlling the compressor, the outer fan and the throttle expansion valve of the target air conditioner to restart at the minimum frequency, the target windshield and the target opening respectively.
2. The control method for preventing the low-voltage error protection according to claim 1, wherein the step of detecting whether the target air conditioner enters the low-voltage pressure switch protection action within a first preset time period comprises the following steps:
detecting the opening and closing state of a low-pressure switch of the target air conditioner within the first preset time period;
and when the on-off state is the off state, determining that the target air conditioner enters a low-pressure switch protection action.
3. The control method for preventing undervoltage false protection as recited in claim 1, further comprising:
and d, when the target air conditioner is restarted and runs for a second preset time length, detecting the opening and closing state of a low-pressure switch of the target air conditioner so as to judge whether the target air conditioner has low-pressure error protection.
4. A control method for preventing undervoltage false protection as defined in claim 3, further comprising:
and e, when the opening and closing state is still in the off state, taking the target windshield as a new starting windshield, taking the target opening as a new running opening, returning to execute the step b until the target windshield is a zero windshield or the target opening reaches a preset maximum opening, and determining that the target air conditioner is normal low-voltage protection.
5. A control method for preventing undervoltage false protection as defined in claim 3, further comprising:
and when the opening and closing state is the closing state, determining that the target air conditioner has low-voltage error protection, and taking the minimum frequency, the target windshield and the target opening as starting parameters so as to enable the target air conditioner to operate based on the starting parameters when the target air conditioner starts the refrigeration mode again.
6. The control method for preventing the low voltage error protection according to claim 4, further comprising:
and when the target windshield is a zero windshield or the target opening reaches a preset maximum opening, determining that the target air conditioner is normal low-pressure protection, controlling the low-pressure switch to keep a disconnection state, and sending a low-pressure switch protection prompt.
7. A control device for preventing low voltage false protection, comprising:
the acquisition module is used for acquiring the outdoor environment temperature;
the first detection module is used for detecting whether the target air conditioner enters a refrigeration mode or not when the outdoor environment temperature is less than or equal to a preset temperature;
the second detection module is used for detecting whether the target air conditioner enters a low-pressure switch protection action within a first preset time length or not when the refrigeration mode starting stage of the target air conditioner is finished;
the control module is used for restarting the target air conditioner when detecting that the target air conditioner enters a low-pressure switch protection action within a first preset time period, so that the target air conditioner exits the low-pressure switch protection action when low-pressure error protection occurs;
the control module is further used for acquiring the starting windshield of the internal and external fans and the operation opening of the throttle expansion valve of the target air conditioner in the starting stage; reducing a preset windshield of the starting windshield to obtain a target windshield of the outer fan, and increasing the running opening by a preset opening to obtain a target opening of the throttle expansion valve; and controlling a compressor, an outer fan and a throttle expansion valve of the target air conditioner to restart at the minimum frequency, the target windshield and the target opening degree respectively.
8. An air conditioner comprising a computer readable storage medium storing a computer program and a processor, the computer program being read and executed by the processor to implement the method of any one of claims 1-6.
9. A computer-readable storage medium, characterized in that it stores a computer program which, when read and executed by a processor, implements the method according to any one of claims 1-6.
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| CN202110555188.6A CN113465114B (en) | 2021-05-21 | 2021-05-21 | Control method and device for preventing low-voltage error protection and air conditioner |
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| CN102331067A (en) * | 2011-05-24 | 2012-01-25 | 宁波奥克斯电气有限公司 | Control method for protection of compressor during refrigeration cycle of direct-current frequency-conversion air conditioner |
| CN108332343A (en) * | 2017-07-21 | 2018-07-27 | 广东美的暖通设备有限公司 | Control method, control device and the air conditioner of air conditioner |
| CN109612022B (en) * | 2018-11-28 | 2021-01-26 | 宁波奥克斯电气股份有限公司 | Control method for preventing air conditioner from blocking valve |
| CN111121227B (en) * | 2019-12-30 | 2022-03-18 | 宁波奥克斯电气股份有限公司 | Fault detection method and device under low-voltage pressure switch protection mode and air conditioner |
| CN112432340B (en) * | 2020-11-26 | 2021-11-26 | 珠海格力电器股份有限公司 | Control method and control device of air conditioner, processor and air conditioning system |
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Effective date of registration: 20221020 Address after: 315191 No. 1166 Mingguang North Road, Jiangshan Town, Ningbo, Zhejiang, Yinzhou District Applicant after: NINGBO AUX ELECTRIC Co.,Ltd. Applicant after: AUX AIR CONDITIONING LIMITED BY SHARE Ltd. Address before: 315191 No. 1166 Mingguang North Road, Jiangshan Town, Ningbo, Zhejiang, Yinzhou District Applicant before: NINGBO AUX ELECTRIC Co.,Ltd. Applicant before: Ningbo Oxfam intelligent commercial air conditioning manufacturing Co.,Ltd. |
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