CN114992775A - Fault recovery control method and equipment - Google Patents

Fault recovery control method and equipment Download PDF

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Publication number
CN114992775A
CN114992775A CN202210564440.4A CN202210564440A CN114992775A CN 114992775 A CN114992775 A CN 114992775A CN 202210564440 A CN202210564440 A CN 202210564440A CN 114992775 A CN114992775 A CN 114992775A
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Prior art keywords
fault
equipment
type
types
restart
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Pending
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CN202210564440.4A
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Chinese (zh)
Inventor
王倩
赖海龙
陆信平
张雪芳
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Priority to CN202210564440.4A priority Critical patent/CN114992775A/en
Publication of CN114992775A publication Critical patent/CN114992775A/en
Pending legal-status Critical Current

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/30Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32Responding to malfunctions or emergencies
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/30Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/49Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring ensuring correct operation, e.g. by trial operation or configuration checks
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/50Control or safety arrangements characterised by user interfaces or communication
    • F24F11/52Indication arrangements, e.g. displays
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/62Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63Electronic processing
    • F24F11/64Electronic processing using pre-stored data
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/70Control systems characterised by their outputs; Constructional details thereof
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/88Electrical aspects, e.g. circuits
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/02Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Human Computer Interaction (AREA)
  • Testing And Monitoring For Control Systems (AREA)

Abstract

The invention discloses a fault recovery control method and equipment, which comprises the following steps: dividing the fault types into a plurality of fault types, and setting corresponding equipment control logic corresponding to each fault type; when the equipment enters the fault, the fault type corresponding to the current fault is judged, and the equipment control logic control equipment of the fault type is selected to carry out fault recovery control or shutdown protection. The invention provides fault classification conditions and performs classification control on different types of fault post-reset conditions. And a method of delayed reset after a fault is provided for a specific fault, so that recovery time is provided for the system state and the environmental condition, and the system reliability and the accuracy of subsequent fault detection and operation control are improved. Meanwhile, different fault codes are displayed according to the fault type and the judgment of the current fault, the fault influence is distinguished, and the reference for the user to report or wait for automatic recovery is provided.

Description

Fault recovery control method and equipment
Technical Field
The invention relates to the technical field of air conditioners, in particular to a fault recovery control method and equipment.
Background
When a fault occurs, the existing general product is not allowed to be restarted after being stopped until the fault recovery condition is met. The control method does not distinguish different types of faults, but the fault types of the actual complex system are various, and the faults of different degrees can affect the reliability of the product according to the same processing method, for example, some faults can be caused by the transient fluctuation of external conditions (voltage, temperature and the like), the faults can quickly reach recovery conditions after shutdown, sufficient buffer time cannot be provided for the system and the external states, and the problem of frequent startup and shutdown can occur; some faults may cause hidden troubles to the normal operation of the system, and if the system is not overhauled and directly restored, the reliability of the system may be affected, and the like. For a user, whether the vehicle can be recovered or not cannot be determined after the vehicle is in a fault shutdown state, the recovery time cannot be determined, related maintenance personnel must be contacted, the use experience is reduced, and meanwhile the workload of the maintenance personnel is increased. It is very important for a complex system to classify a fault.
Disclosure of Invention
The invention provides a fault recovery control method and equipment, aiming at solving the technical problem that the equipment cannot perform fault recovery control without distinguishing faults in the prior art.
The technical scheme adopted by the invention is as follows:
the invention provides a fault recovery control method, which is characterized by comprising the following steps:
dividing the fault types into a plurality of fault types, and setting corresponding equipment control logic corresponding to each fault type;
when the equipment enters the fault, the fault type corresponding to the current fault is judged, and the equipment control logic control equipment of the fault type is selected to carry out fault recovery control or shutdown protection.
Further, the fault types are divided according to the restorable degree of the fault, and the fault types are divided into a first type of fault, a second type of fault, a third type of fault and a fourth type of fault in sequence from low to high according to the restorable degree.
Further, a fault code is displayed when the device control logic is operated to control the device.
One type of failed device control logic is: the equipment is shut down and reports a class A fault code, and the equipment is limited from restarting.
The device control logic for the second type of fault is as follows: judging whether the fault restart times of the equipment are greater than or equal to the preset fault restart times;
if yes, the equipment is stopped and reports an A-type fault code, and the equipment is limited to be restarted;
if not, judging whether the difference value between the time when the equipment fails at the current time and the time when the equipment fails at the first time is less than preset restart counting time or not; if yes, stopping the machine, reporting a B-type fault code, recording the restart times of one fault, starting to count down by preset restart permission count-down time, eliminating the fault code after the count-down is finished, and allowing the restart when the equipment has a start requirement; if not, stopping the machine, reporting a B-type fault code, modifying the recorded fault restarting frequency of the equipment to 1 time, starting countdown according to preset restart permission countdown time, eliminating the fault code after the countdown is finished, and allowing the equipment to restart when the equipment has a starting requirement.
The device control logic for three types of faults is as follows: the equipment is shut down and reports a C-type fault code, countdown is started according to preset restart permission countdown time corresponding to the fault, the fault elimination condition corresponding to the current fault is met, the fault code is eliminated after the countdown is finished, and the equipment is allowed to be started when the starting requirement exists; and if the fault elimination condition corresponding to the current fault is not met, maintaining the shutdown state of the equipment and not allowing the equipment to be restarted.
The equipment control logic of the four types of faults is as follows: reporting a fault code corresponding to the current fault, and judging whether a fault elimination condition corresponding to the current fault is met; if so, eliminating the fault code and allowing the equipment to be restarted; if not, the shutdown state of the equipment is maintained, and the equipment is not allowed to be restarted.
The invention also provides equipment, and the equipment is controlled by using the fault recovery control method to carry out fault recovery control or shutdown protection.
Preferably, the device is an air conditioner.
Compared with the prior art, the invention has the following advantages:
1. and (4) providing fault classification conditions, and performing classification control on different types of fault post-reset conditions.
2. The method for delaying reset after the fault is provided for specific faults provides recovery time for system states and environmental conditions, and improves the reliability of the system and the accuracy of subsequent fault detection and operation control.
3. And displaying different fault codes according to the fault type and the judgment of the current fault, distinguishing the fault influence and providing a reference for a user to report or wait for automatic recovery.
4. A control method for fault classification detection and judgment is provided, the fault which allows restarting is upgraded to the fault which does not allow restarting after multiple detections, and the detection accuracy and reliability are improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a flow chart of an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The principles and construction of the present invention will be described in detail below with reference to the drawings and examples.
When the existing equipment, such as an air conditioning unit, fails, a rule that restarting is not allowed after shutdown is generally adopted, and the air conditioning unit cannot be restarted until a failure recovery condition is met. However, in practice, the types of faults of a complex system are various, and faults of different degrees have influence on the reliability of products according to the same processing method. Therefore, the invention presets a plurality of fault types according to the fault degree, one fault type comprises a plurality of faults with the same or similar fault degrees, and a corresponding device control logic is arranged corresponding to each fault type, so that the faults of different types can be distinguished, and the fault recovery efficiency of the device is improved.
As shown in fig. 1, the present invention provides a fault recovery control method, which specifically includes the steps of:
presetting a plurality of fault types, specifically, uniformly classifying all faults occurring in the debugging process of the equipment into a plurality of fault types, namely, each fault type comprises a part of faults possibly occurring in the equipment, and setting corresponding equipment control logic corresponding to each fault type;
when the equipment enters the fault, the fault type of the current fault is judged, and the equipment control logic control equipment of the fault type is selected to perform shutdown protection or fault recovery control on the fault.
The scheme provided by the invention can solve various operation reliability problems caused by using the same processing mode for faults with different degrees, and prevent the service life loss of a product system caused by improper processing. And corresponding equipment control logics are set corresponding to each fault type, so that different types of faults can be distinguished, and the fault recovery efficiency of the equipment is improved.
Specifically, the fault types are divided according to the fault degree, and the fault types are sequentially divided into a first type fault, a second type fault, a third type fault and a fourth type fault according to the fault degree. Specifically, each fault classification may be different according to different requirements of products, fault protection points and devices, and can be classified by designers according to actual conditions by referring to a classification method.
Taking air conditioning equipment as an example, one type of fault is a hardware fault of a product which is not influenced by factors such as external interference, an operation state and the like, or fault protection with great potential safety hazard to system operation, and after the fault occurs, the product is not allowed to be restarted, and needs professional maintenance, such as general communication fault, overflow protection and the like.
The second type of faults are self faults which are influenced by external interference and running states during fault detection and can be determined only by multiple detections, relevant external factors need to be eliminated for a certain time after the faults are detected accidentally, and once the faults are determined, the unit is not allowed to be restarted, and professional personnel are required to maintain, such as air conditioning system fan faults, compressor overcurrent protection and the like.
The three types of faults are influenced by external interference and running states, and state protection that the initial state of the system needs to be restored or external conditions need to be changed within a certain time is required.
In the four types of faults, the faults of the system and hidden danger of system operation can be eliminated or the system can return to an initial state for meeting the fault clearing condition, and subsequent operation is not influenced any more, such as temperature sensing bulb faults, high-voltage protection and the like.
In order to facilitate a user to know the actual fault condition of equipment in real time, when the equipment runs according to corresponding equipment control logic set by a fault type, fault codes are displayed, the fault codes are sequentially divided into A-type fault codes, B-type fault codes and C-type fault codes according to the fault degree, the A-type fault codes represent serious faults, and when the equipment reports the A-type fault codes, the equipment generally has hardware faults of products or fault protection with great potential safety hazards on system running; when the equipment reports the B-type fault code, the equipment is generally influenced by external interference and running state, and the self fault can be determined through multiple detections; when the equipment reports the C-type fault code, the equipment generally only needs a certain time to restore the initial state of the system or change the state protection of the external condition, but the reliable operation of the system is influenced if the system or the equipment fails.
It should be noted that A, B, C-class fault codes can be obtained by acquiring different codes as required, only type distinction is made, and there is no fixed requirement, for example, a fault (a-class) code of a certain product itself can be set as Fn (n is a number, and 1, 2, 3. Continuous class a indicates repair is required and class B, C may wait for automatic recovery. The present embodiment is only briefly described with these three fault codes, and more types of fault codes may be set as needed, and also fall within the protection scope of the present invention.
The fault control logic for each fault type will be described in detail below.
When the equipment enters a fault, a control system of the equipment acquires a fault parameter, and compares the fault parameter with a preset fault parameter to determine the fault, so that the fault type corresponding to the fault is judged.
One type of fault type of device control logic is: the equipment reports the A-type fault codes and is not allowed to be restarted, one type of fault comprises faults which cannot be solved through restarting, and forced starting of the equipment can cause damage to the equipment, so that the equipment is directly limited to be started, and a user can report the fault codes as soon as possible.
The second type of fault specifically presets fault entry conditions, restart permission times, restart counting time and restart permission countdown time for each type of fault contained in the second type of fault, and compares the memorized fault restart times with the preset fault restart times after the fault is detected.
The device control logic for the two types of failure is:
judging whether the fault restart times of the equipment are greater than or equal to the preset fault restart times;
if yes, stopping the machine and reporting the A-type fault codes, and not allowing the equipment to be restarted after the fault is stopped, because after repeated restarting, if the equipment cannot normally operate, the equipment cannot normally operate only through restarting, and in order to avoid further worsening of the equipment fault condition, directly reporting the A-type fault codes and limiting the restarting to prevent the equipment from being seriously damaged;
if not, further judging whether the difference value between the time Tn when the equipment fails this time and the time T1 when the equipment fails the first time is less than the preset restart count time T;
if yes, stopping the equipment, reporting a B-type fault code, counting once by a counter of the equipment (namely the fault restart times of the equipment are plus 1), starting countdown according to preset restart-allowed countdown time corresponding to the current fault, and eliminating the fault code and allowing the equipment to restart after the countdown is finished;
if not, the equipment is stopped, a B-type fault code is reported, the counter of the equipment is adjusted to be 1 (namely the fault restarting time of the equipment = 1), countdown is started according to the preset restarting permission countdown time corresponding to the current fault, and after the countdown is finished, the fault code is eliminated, and the equipment is allowed to restart.
The three types of fault also preset fault entry conditions, restart permission countdown time, and fault clearing conditions for each fault they contain in advance.
The control logic of the equipment with three fault types is as follows: after the fault is detected, the control equipment is stopped, a C-type fault code is reported, countdown is started according to preset restart permission countdown time corresponding to the current fault, the fault elimination condition is met, and after the countdown is finished, the equipment is allowed to be restarted when the starting requirement exists; if the fault elimination condition is met in the countdown process, only fault elimination is displayed, countdown is continued, and starting is not allowed; no start-up is allowed if the fault elimination condition is not met under any condition. (the restart permission countdown time is determined according to the system state recovery speed and the fault influence factor, that is, different restart permission countdown times can be preset for different faults)
The device control logic for four types of faults is as follows: reporting a fault code corresponding to the fault, and judging whether the fault code is met, namely judging a fault elimination condition corresponding to the current fault; if so, eliminating the fault code and allowing the equipment to be restarted; if not, the shutdown state of the equipment is maintained, and the equipment is not allowed to be restarted.
It should be noted that the device is restarted as a normal boot, and it is still necessary to detect whether the preset starting condition of the corresponding product is satisfied before the load acts.
The following takes an air conditioner as an example, and specifically exemplifies four types of faults.
Figure DEST_PATH_IMAGE002
And (4) presetting a fault code F1 for the class a fault, stopping the machine after meeting the fault a entering condition, reporting F1, not allowing restarting, and needing to contact maintenance personnel for unit maintenance.
Figure DEST_PATH_IMAGE004
Presetting class B fault B code L2, class A code F2, restart permission times 3, restart counting time 1 hour, restart permission countdown 600s, and after meeting the B fault entry condition:
(1) if the fault has been counted 3 times, the report F2 is stopped and the restart is not allowed;
(2) if the fault count is less than 3 times, judging the time from the last fault:
a) if the time is less than 1 hour, the L2 is reported to stop the machine, the counter counts +1 (namely if the current time is the second fault within 1 hour, the count is 1+1=2 times), the time is counted down for 600s, the L2 display is eliminated after the time counting down is finished, and the machine can enter the work according to the normal time sequence if the time is required to be restarted;
b) if the time exceeds 1 hour, the L2 is reported to stop, the counter is counted for =1 time (namely if the first fault occurs before 1 hour, the count is counted for 2 times, and the count is counted for 1 time after the fault occurs at this time), the counting is counted for 600s, the L2 display is eliminated after the counting is finished, and the operation can be started again according to the normal time sequence if the operation needs to be restarted.
Figure DEST_PATH_IMAGE006
Presetting a fault code S3 for a c-like fault, restarting for 600S of countdown permission, if the c-like fault entry condition is met, reporting S3 to stop the machine, counting down for 600S, and if the c-like fault elimination condition is met, counting down for 600SThe countdown is not completed, and only the display of S3 is canceled, but restart is not allowed, and restart is allowed only after the failure cancellation condition is satisfied and the countdown is completed. If the c fault elimination condition is not satisfied continuously, restarting is not allowed.
Figure DEST_PATH_IMAGE008
And d-like fault presetting fault codes F4, if d fault entry conditions are met, reporting F4 to stop the machine, if d fault recovery conditions are met, allowing restart, otherwise, not allowing restart.
The invention also provides equipment, and the equipment is debugged by using the equipment fault recovery control method.
The device may specifically be an air conditioner.
The control method provided by the invention is applied to equipment and has the following advantages:
1. and (4) providing fault classification conditions, and performing classification control on different types of fault post-reset conditions.
2. The method for delaying reset after the fault is provided for specific faults provides recovery time for system states and environmental conditions, and improves system reliability and accuracy of follow-up fault detection and operation control.
3. And displaying different fault codes according to the fault type and the judgment of the current fault, distinguishing the fault influence and providing a reference for a user to report or wait for automatic recovery.
4. A control method for fault classification detection and judgment is provided, the fault which allows restarting is upgraded to the fault which does not allow restarting after multiple detections, and the detection accuracy and reliability are improved.
It is noted that the terminology used above is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, so that the scope of the present application is not to be construed as being limited.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A failure recovery control method characterized by comprising the steps of:
dividing the fault types into a plurality of fault types, and setting corresponding equipment control logic corresponding to each fault type;
when the equipment enters the fault, the fault type corresponding to the current fault is judged, and the equipment control logic control equipment of the fault type is selected to carry out fault recovery control or shutdown protection.
2. The fault recovery control method according to claim 1, wherein the fault types are divided according to a restorable degree of the fault, and the fault types are sequentially divided into a first type of fault, a second type of fault, a third type of fault and a fourth type of fault from low to high according to the restorable degree.
3. The fault-resilient control method of claim 2, wherein a fault code is displayed when the device control logic is run to control the device.
4. The fault recovery control method of claim 2, wherein the device control logic for the one type of fault is: the equipment is shut down and reports a class A fault code, and the equipment is limited from restarting.
5. The fault recovery control method of claim 2, wherein the device control logic for the two types of faults is: and judging whether the fault restarting times of the equipment are greater than or equal to the preset fault restarting times, if so, stopping the equipment, reporting an A-type fault code, and limiting the equipment to restart.
6. The fault recovery control method according to claim 5, wherein if not, it is determined whether a difference between a time when the current fault occurs to the device and a time when the first fault occurs to the device is less than a preset restart count time; if yes, stopping the machine, reporting a B-type fault code, recording the restart times of one fault, starting to count down by preset restart permission count-down time, eliminating the fault code after the count-down is finished, and allowing the restart when the equipment has a start requirement; if not, stopping the machine and reporting a B-type fault code, modifying the recorded fault restarting times of the equipment to 1 time, starting countdown according to preset restart permission countdown time, eliminating the fault code after the countdown is finished, and allowing the equipment to restart when the equipment has a starting requirement.
7. The fault-resilient control method according to claim 2, wherein the device control logic for the three types of faults is: the equipment is shut down and reports a C-type fault code, countdown is started according to preset restart permission countdown time corresponding to the fault, the fault elimination condition corresponding to the current fault is met, the fault code is eliminated after the countdown is finished, and the equipment is allowed to be started when the starting requirement exists; and if the fault elimination condition corresponding to the current fault is not met, maintaining the shutdown state of the equipment, and not allowing to restart.
8. The fault-resilient control method of claim 2, wherein the device control logic for the four types of faults is: reporting a fault code corresponding to the current fault, and judging whether a fault elimination condition corresponding to the current fault is met; if so, eliminating the fault code and allowing the equipment to be restarted; if not, the shutdown state of the equipment is maintained, and the equipment is not allowed to be restarted.
9. An apparatus characterized in that the failure recovery control method of any one of claims 1 to 8 is used to control the apparatus for failure recovery control or shutdown protection.
10. The apparatus of claim 9, wherein the apparatus is an air conditioner.
CN202210564440.4A 2022-05-23 2022-05-23 Fault recovery control method and equipment Pending CN114992775A (en)

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Application publication date: 20220902