CN112503737A - Operation method and system of air conditioner adaptive low-power generator - Google Patents
Operation method and system of air conditioner adaptive low-power generator Download PDFInfo
- Publication number
- CN112503737A CN112503737A CN202011405906.3A CN202011405906A CN112503737A CN 112503737 A CN112503737 A CN 112503737A CN 202011405906 A CN202011405906 A CN 202011405906A CN 112503737 A CN112503737 A CN 112503737A
- Authority
- CN
- China
- Prior art keywords
- frequency
- power
- air conditioner
- real
- threshold
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000003044 adaptive effect Effects 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000006243 chemical reaction Methods 0.000 claims abstract description 15
- 238000004321 preservation Methods 0.000 claims abstract description 14
- 238000004378 air conditioning Methods 0.000 claims abstract description 8
- 238000004364 calculation method Methods 0.000 claims abstract description 4
- 238000005070 sampling Methods 0.000 claims abstract description 4
- 230000001960 triggered effect Effects 0.000 claims description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- F24F11/56—Remote control
-
- 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
-
- 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
-
- 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
-
- 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
Landscapes
- 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)
- Human Computer Interaction (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Thermal Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides an operation method and a system of an air conditioner adaptive low-power generator, aiming at overcoming the problem of overload load shutdown when the rated power of an air conditioner is greater than the output power of a generator, wherein the system comprises a threshold setting module, a real-time power calculation module, a comparison module, an up-conversion driving module and a down-conversion driving module; and a variable frequency speed control module; the method comprises the following steps: setting a frequency reduction threshold, a frequency preservation threshold and an frequency increasing threshold; sampling to obtain real-time power; when the real-time power is greater than or equal to the frequency reduction threshold value, reducing the running frequency of the air conditioner compressor; when the real-time power is smaller than the frequency reduction threshold and is larger than or equal to the frequency preservation threshold, maintaining the running frequency of the air conditioner compressor or allowing the running frequency to be reduced; when the real-time power is smaller than the frequency-maintaining threshold and is larger than or equal to the frequency-increasing threshold, the air conditioner compressor performs slow frequency-increasing; when the real-time power is less than the frequency-increasing threshold value, the air-conditioning compressor operates according to the rated power or performs frequency-increasing according to the requirement.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to an operation method and system of an air conditioner adaptive low-power generator.
Background
In some areas, a household generator is needed to supply power due to frequent power failure, however, the generator is generally low in power, the rated power of the air conditioner is generally high, and if the rated power of the air conditioner is higher than the output power of the generator, the generator can be shut down due to overload after the air conditioner is started, so that the air conditioner cannot normally operate.
Disclosure of Invention
The invention provides an operation method and a system of an air conditioner adaptive low-power generator, aiming at solving the problem of overload shutdown when the rated power of an air conditioner is greater than the output power of the generator, and the specific technical content is as follows:
the invention relates to an operation method of an air conditioner adaptive low-power generator, which comprises the following steps:
setting a frequency reduction threshold value Power down, a frequency preservation threshold value Power norm and an frequency increasing threshold value Power up;
sampling to obtain real-time voltage U and real-time current I of an air conditioner driving board, and calculating to obtain real-time power P as UI;
when the real-time Power P is greater than or equal to the frequency-reduction threshold value Power down, reducing the operating frequency of the compressor of the air conditioner until the real-time Power P is less than the frequency-reduction threshold value Power down;
when the real-time Power P is smaller than the frequency reduction threshold value Power down and is greater than or equal to the frequency preservation threshold value Power norm, maintaining the operating frequency of the air conditioner compressor or allowing the operating frequency of the air conditioner compressor to be reduced;
when the real-time Power P is smaller than the frequency-preserving threshold Power norm and is greater than or equal to the frequency-increasing threshold Power up, the air conditioner compressor performs slow frequency increasing until the real-time Power is greater than the frequency-preserving threshold Power norm; the slow frequency raising is that the raising amplitude of each frequency gear is less than the normal raising amplitude set by the air-conditioning compressor;
when the real-time Power P is less than the frequency-increasing threshold Power up, the air-conditioning compressor is operated according to the rated Power or frequency-increasing is carried out according to the requirement.
In one or more embodiments of the present invention, when the real-time Power P is greater than or equal to the Power down threshold and lasts for T1 seconds for the first time, the down-conversion operation of the air conditioner compressor is triggered, and the down-conversion is performed at a speed of decreasing by one step every T1 seconds until the real-time Power P is less than the Power down threshold.
In one or more embodiments of the invention, the T1 is set to 5-8 seconds, and the T1 is set to 45-50 seconds.
In one or more embodiments of the present invention, when the real-time Power P is less than the frequency-preserving threshold Power norm and greater than or equal to the frequency-increasing threshold Power up, the air conditioner compressor is slowly down-converted, i.e., frequency-increased at a speed of one gear increase every t2 seconds, until the real-time Power P is greater than the frequency-preserving threshold Power norm.
In one or more embodiments of the invention, t2 is set to 60-70 seconds.
In one or more embodiments of the present invention, after the real-time Power P is less than the frequency-increasing threshold Power up for T2 seconds, the air conditioner compressor is operated at its rated Power or frequency-increased as needed.
In one or more embodiments of the invention, the T2 is set to 50-60 seconds.
In one or more embodiments of the present invention, when the air conditioner compressor is first turned on and the down-conversion operation due to the Power overload does not occur, the air conditioner compressor is operated at its rated Power or up-converted as needed without being modulated to the hold interval defined between the down-conversion threshold Power down and the frequency-holding threshold Power norm.
In one or more embodiments of the present invention, an operation key for starting the generator operation mode is provided on the air conditioner remote controller, the user starts the generator operation mode through the operation key, and the air conditioner executes the control logic of the method after receiving the instruction.
The invention relates to an operation system of an air conditioner adaptive low-power generator, which comprises:
the threshold setting module is used for setting a frequency reduction threshold Power down, a frequency preservation threshold Power norm and a frequency increasing threshold Power up;
the real-time power calculation module is used for collecting real-time voltage U and real-time current I of the air conditioner driving board and calculating real-time power P;
a comparison module for comparing the real-time Power P with the frequency-reducing threshold value Power down, the frequency-preserving threshold value Power norm and the frequency-increasing threshold value Power up;
an up-conversion driving module for performing up-conversion operation;
the frequency reduction driving module is used for executing frequency reduction operation;
the frequency conversion speed control module is used for controlling the frequency increasing or reducing speed; and
and the timing module is butted with the comparison module and is used for providing judgment time.
The invention has the beneficial effects that: the invention utilizes the software algorithm to control the running power of the whole air conditioner, so that the power does not exceed the output power of the generator, thereby ensuring that the air conditioner can run on the low-power generator, expanding the operable range of the air conditioner and leading the user of the low-power generator to enjoy the comfortable feeling brought by the air conditioner.
Drawings
FIG. 1 is a logic diagram of the power control frequency up-down logic of the present invention.
Detailed Description
The scheme of the present application is further described below with reference to fig. 1:
the invention relates to an operation method of an air conditioner adaptive low-power generator, which comprises the following steps:
setting a frequency reduction threshold value Power down, a frequency preservation threshold value Power norm and an frequency increasing threshold value Power up;
sampling to obtain real-time voltage U and real-time current I of an air conditioner driving board, and calculating to obtain real-time power P as UI;
when the real-time Power P is greater than or equal to the frequency reduction threshold Power down and lasts for 5 seconds for the first time, reducing the frequency at the speed of reducing one gear every 45 seconds until the real-time Power P is less than the frequency reduction threshold Power down;
when the real-time Power P is smaller than the frequency reduction threshold value Power down and is greater than or equal to the frequency preservation threshold value Power norm, maintaining the operating frequency of the air conditioner compressor or allowing the operating frequency of the air conditioner compressor to be reduced;
when the real-time Power P is smaller than the frequency-preserving threshold Power norm and is greater than or equal to the frequency-increasing threshold Power up, the air conditioner compressor performs slow frequency increasing, namely frequency increasing is performed at the speed of increasing one gear every 60 seconds until the real-time Power is greater than the frequency-preserving threshold Power norm; the slow frequency raising is that the raising amplitude of each frequency gear is less than the normal raising amplitude set by the air-conditioning compressor;
and when the real-time Power P is smaller than the frequency increasing threshold value Power up and lasts for 60 seconds, the air conditioner compressor operates according to the rated Power or performs frequency increasing according to the requirement.
The frequency reduction threshold value Power down, the frequency preservation threshold value Power norm and the frequency increasing threshold value Power up can be assigned to adapt to generators with different powers through parameters; in the first gear up or the first gear down in the above steps, 20W is used as the minimum power unit, and the minimum power unit is increased or decreased each time.
The air conditioner remote controller is provided with an operation key for starting the generator operation mode, a user starts the generator operation mode through the operation key, and the air conditioner executes the control logic after receiving an instruction.
When the air conditioner compressor is started for the first time and the frequency reduction operation executed due to Power overload does not occur, the air conditioner compressor runs at the rated Power or performs frequency increase as required without frequency modulation to a holding interval defined between a frequency reduction threshold Power down and a frequency preservation threshold Power norm.
An operating system of an air conditioner adaptive low power generator, comprising:
the threshold setting module is used for setting a frequency reduction threshold Power down, a frequency preservation threshold Power norm and a frequency increasing threshold Power up;
the real-time power calculation module is used for collecting real-time voltage U and real-time current I of the air conditioner driving board and calculating real-time power P;
a comparison module for comparing the real-time Power P with the frequency-reducing threshold value Power down, the frequency-preserving threshold value Power norm and the frequency-increasing threshold value Power up;
an up-conversion driving module for performing up-conversion operation;
the frequency reduction driving module is used for executing frequency reduction operation;
the frequency conversion speed control module is used for controlling the frequency increasing or reducing speed; and
and the timing module is butted with the comparison module and is used for providing judgment time.
The above preferred embodiments should be considered as examples of the embodiments of the present application, and technical deductions, substitutions, improvements and the like similar to, similar to or based on the embodiments of the present application should be considered as the protection scope of the present patent.
Claims (10)
1. An operation method of an air conditioner adaptive low-power generator is characterized by comprising the following steps:
setting a frequency reduction threshold value Power down, a frequency preservation threshold value Power norm and an frequency increasing threshold value Power up;
sampling to obtain real-time voltage U and real-time current I of an air conditioner driving board, and calculating to obtain real-time power P as UI;
when the real-time Power P is greater than or equal to the frequency-reduction threshold value Power down, reducing the operating frequency of the compressor of the air conditioner until the real-time Power P is less than the frequency-reduction threshold value Power down;
when the real-time Power P is smaller than the frequency reduction threshold value Power down and is greater than or equal to the frequency preservation threshold value Power norm, maintaining the operating frequency of the air conditioner compressor or allowing the operating frequency of the air conditioner compressor to be reduced;
when the real-time Power P is smaller than the frequency-preserving threshold Power norm and is greater than or equal to the frequency-increasing threshold Power up, the air conditioner compressor performs slow frequency increasing until the real-time Power is greater than the frequency-preserving threshold Power norm; the slow frequency raising is that the raising amplitude of each frequency gear is less than the normal raising amplitude set by the air-conditioning compressor;
when the real-time Power P is less than the frequency-increasing threshold Power up, the air-conditioning compressor is operated according to the rated Power or frequency-increasing is carried out according to the requirement.
2. The method of operating an air conditioner adaptive low power generator according to claim 1, wherein: when the real-time Power P is larger than or equal to the frequency reduction threshold Power down and lasts for T1 seconds for the first time, the frequency reduction operation of the air conditioner compressor is triggered, and the frequency reduction is carried out at the speed of reducing by one gear every T1 seconds until the real-time Power P is smaller than the frequency reduction threshold Power down.
3. The method of operating an air conditioner adaptive low power generator according to claim 2, wherein: the T1 is set to 5-8 seconds, and the T1 is set to 45-50 seconds.
4. The method of operating an air conditioner adaptive low power generator according to claim 1, wherein: and when the real-time Power P is smaller than the frequency-preserving threshold Power norm and is greater than or equal to the frequency-increasing threshold Power up, performing frequency-decreasing operation on the air conditioner compressor, namely increasing the frequency at a speed of increasing one gear every t2 seconds until the real-time Power is greater than the frequency-preserving threshold Power norm.
5. The method of operating an air conditioner adaptive low power generator according to claim 3, wherein: the t2 is set to 60-70 seconds.
6. The method of operating an air conditioner adaptive low power generator according to claim 1, wherein: and when the real-time Power P is less than the frequency raising threshold value Power up and lasts for T2 seconds, the air conditioner compressor operates according to the rated Power or performs frequency raising according to the requirement.
7. The method of operating an air conditioner adaptive low power generator according to claim 5, wherein: the T2 is set to 50-60 seconds.
8. Method for operating an air-conditioning adaptive low-power generator according to any of claims 1-7, characterized in that: when the air conditioner compressor is started for the first time and the frequency reduction operation executed due to Power overload does not occur, the air conditioner compressor runs at the rated Power or performs frequency increase as required without frequency modulation to a holding interval defined between a frequency reduction threshold Power down and a frequency preservation threshold Power norm.
9. Method for operating an air-conditioning adaptive low-power generator according to any of claims 1-7, characterized in that: an operation key for starting the generator operation mode is arranged on the air conditioner remote controller, a user starts the generator operation mode through the operation key, and the air conditioner executes the control logic of the method after receiving the instruction.
10. An operating system of an air conditioner adaptive low-power generator, comprising:
the threshold setting module is used for setting a frequency reduction threshold Power down, a frequency preservation threshold Power norm and a frequency increasing threshold Power up;
the real-time power calculation module is used for collecting real-time voltage U and real-time current I of the air conditioner driving board and calculating real-time power P;
a comparison module for comparing the real-time Power P with the frequency-reducing threshold value Power down, the frequency-preserving threshold value Power norm and the frequency-increasing threshold value Power up;
an up-conversion driving module for performing up-conversion operation;
the frequency reduction driving module is used for executing frequency reduction operation;
the frequency conversion speed control module is used for controlling the frequency increasing or reducing speed; and
and the timing module is butted with the comparison module and is used for providing judgment time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011405906.3A CN112503737A (en) | 2020-12-04 | 2020-12-04 | Operation method and system of air conditioner adaptive low-power generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011405906.3A CN112503737A (en) | 2020-12-04 | 2020-12-04 | Operation method and system of air conditioner adaptive low-power generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112503737A true CN112503737A (en) | 2021-03-16 |
Family
ID=74969868
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011405906.3A Pending CN112503737A (en) | 2020-12-04 | 2020-12-04 | Operation method and system of air conditioner adaptive low-power generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112503737A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115899948A (en) * | 2022-11-11 | 2023-04-04 | 青岛海尔空调器有限总公司 | Air conditioner compressor starting control method and device and air conditioner |
| WO2024207820A1 (en) * | 2023-04-07 | 2024-10-10 | 珠海格力电器股份有限公司 | Device operation control method and apparatus, electric device, unit and storage medium |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5720579A (en) * | 1980-07-12 | 1982-02-03 | Osaka Gas Co Ltd | Control of air-cooler and/or air-heater power |
| JP2002204598A (en) * | 2001-01-09 | 2002-07-19 | Tokyo Gas Co Ltd | Motor serving as generator, and its driving control method |
| CN105318494A (en) * | 2014-06-12 | 2016-02-10 | Lg电子株式会社 | Air conditioner and method for controlling same |
| CN107084124A (en) * | 2017-05-18 | 2017-08-22 | 广州视源电子科技股份有限公司 | Frequency limiting control method and system for variable frequency compressor |
| CN108317695A (en) * | 2017-12-26 | 2018-07-24 | 青岛海尔空调器有限总公司 | A kind of adaptive generator air conditioning control method and device |
| CN111219859A (en) * | 2018-11-23 | 2020-06-02 | 奥克斯空调股份有限公司 | Air conditioner operation frequency protection method and air conditioner |
-
2020
- 2020-12-04 CN CN202011405906.3A patent/CN112503737A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5720579A (en) * | 1980-07-12 | 1982-02-03 | Osaka Gas Co Ltd | Control of air-cooler and/or air-heater power |
| JP2002204598A (en) * | 2001-01-09 | 2002-07-19 | Tokyo Gas Co Ltd | Motor serving as generator, and its driving control method |
| CN105318494A (en) * | 2014-06-12 | 2016-02-10 | Lg电子株式会社 | Air conditioner and method for controlling same |
| CN107084124A (en) * | 2017-05-18 | 2017-08-22 | 广州视源电子科技股份有限公司 | Frequency limiting control method and system for variable frequency compressor |
| CN108317695A (en) * | 2017-12-26 | 2018-07-24 | 青岛海尔空调器有限总公司 | A kind of adaptive generator air conditioning control method and device |
| CN111219859A (en) * | 2018-11-23 | 2020-06-02 | 奥克斯空调股份有限公司 | Air conditioner operation frequency protection method and air conditioner |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115899948A (en) * | 2022-11-11 | 2023-04-04 | 青岛海尔空调器有限总公司 | Air conditioner compressor starting control method and device and air conditioner |
| WO2024207820A1 (en) * | 2023-04-07 | 2024-10-10 | 珠海格力电器股份有限公司 | Device operation control method and apparatus, electric device, unit and storage medium |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107477820B (en) | Air conditioner control system, detection device, air conditioner and readable storage medium | |
| CN112503737A (en) | Operation method and system of air conditioner adaptive low-power generator | |
| CN109539496B (en) | Air conditioner self-adaptive control method and air conditioner | |
| CA2518074A1 (en) | Control system for doubly fed induction generator | |
| CN113932377A (en) | Photovoltaic air conditioner, control method thereof and computer-readable storage medium | |
| CN101691939A (en) | Air conditioner capable of realizing intelligent dual-mode switching | |
| CN111478571B (en) | Control method and device of frequency converter | |
| CN113639428A (en) | Air conditioner energy-saving control method and device and air conditioner | |
| CN107546780B (en) | Power control algorithm of wind generating set | |
| CN108693778B (en) | Control method of fixed frequency household appliance, power control module and readable storage medium | |
| CN101931345B (en) | Solar charging system, highest power point tracking device and turn ON/OFF method thereof | |
| CN111023465A (en) | Control method and device of air conditioner, air conditioner and readable storage medium | |
| CN114110997B (en) | Operation frequency control method of air conditioner, air conditioner and storage medium | |
| CN113028576B (en) | Air conditioner control method and device and air conditioner | |
| CN115235087A (en) | Control method of air conditioning system | |
| CN113606737A (en) | Fan rotating speed control method and device and air conditioner | |
| JPH06272991A (en) | Solar air conditioner | |
| TWI848737B (en) | Motor current optimization control method and system | |
| CN114000974B (en) | Redundancy control method based on variable pitch variable speed wind generating set | |
| CN116066922A (en) | Control method and control device of solar air conditioner and solar air conditioner | |
| CN115823670B (en) | Control method and control device of solar air conditioner and solar air conditioner | |
| CN111609551B (en) | Heat pump system voltage self-adaptive control method and heat pump system | |
| CN109763935B (en) | Control method for miniature wind driven generator of standby power supply system of wind turbine generator | |
| CN115864784A (en) | Control method of power conversion module and multi-split system | |
| CN112113306A (en) | Self-adaptive response method for maintaining ambient temperature |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210316 |