CN109556243B - Control method for air conditioner - Google Patents
Control method for air conditioner Download PDFInfo
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- CN109556243B CN109556243B CN201811159931.0A CN201811159931A CN109556243B CN 109556243 B CN109556243 B CN 109556243B CN 201811159931 A CN201811159931 A CN 201811159931A CN 109556243 B CN109556243 B CN 109556243B
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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
- F24F11/50—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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
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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
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention belongs to the technical field of air conditioners and aims to solve the problems that a fan control mode of an existing air conditioner is not beneficial to energy conservation, indoor heat load is increased, noise is generated, and user experience is poor. To this end, the present invention provides a control method for an air conditioner including an indoor unit and a compressor, the control method including: enabling a fan of the indoor unit to operate within a temperature interval formed by a first preset temperature and a second preset temperature and lasting for a first preset time; acquiring the indoor environment temperature at the end of the first preset time; and selectively adjusting the fan according to the indoor environment temperature at the end of the first preset time. The invention can avoid generating excessive energy consumption, leads the air conditioner to be more energy-saving, and leads the fan not to generate heat because the fan can stop rotating, avoids increasing the indoor heat load, does not generate noise, and further improves the user experience.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly provides a control method for an air conditioner.
Background
The air conditioner is more and more popular along with the development of society, the problem of energy saving of the air conditioner is more and more important, in the refrigeration operation of a conventional air conditioner product, after the temperature in a room reaches a set value precision range, the compressor can stop operating, and because the temperature sensor is arranged on the air return side of the indoor unit, in order to ensure the accuracy of detecting the room temperature, after the compressor is stopped, the fan of the indoor unit needs to continuously operate, so that the compressor can be started to perform the refrigeration operation again when the indoor air flows through the environment temperature sensor and the environment temperature rises to be out of the set value return difference temperature range.
In the prior art, during the period that the indoor environment temperature rises, namely during the period from the stop of the compressor of the air conditioner to the restart of the operation, the fan is always in the operation state, and the disadvantages of the arrangement are that: firstly, because the fan keeps supplying air all the time, the fan is in a charged running state, the electric energy is consumed, the energy is wasted, and the use cost of a user is increased; secondly, as the fan is electrified and continuously runs, the motor can generate heat, most of electric energy is converted into heat energy and is dissipated into a room, which is equivalent to increasing heat load for the room; thirdly, the fan continuously supplies air and generates noise to influence the comfort of users. That is to say, adopt prior art's fan control mode can waste the energy, be unfavorable for the energy-conservation of air conditioner, and the fan continuously operation also is equivalent to a heat source, increases the room load to the fan produces the noise, leads to user experience not good.
Therefore, there is a need in the art for a new control method for an air conditioner to solve the above-mentioned problems.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, to solve the problems that the fan control mode of the existing air conditioner is not favorable for energy saving, increases indoor heat load and generates noise, resulting in poor user experience, the present invention provides a control method for an air conditioner, wherein the air conditioner comprises an indoor unit and a compressor, and the control method comprises: enabling a fan of the indoor unit to operate within a temperature interval formed by a first preset temperature and a second preset temperature and lasting for a first preset time; acquiring the indoor environment temperature at the end of the first preset time; and selectively adjusting the fan according to the indoor environment temperature when the first preset time is over, wherein the first preset temperature is the indoor environment temperature when the compressor stops operating when the air conditioner refrigerates, and the second preset temperature is the indoor environment temperature when the compressor starts operating when the air conditioner refrigerates.
In a preferred technical solution of the above control method, the step of "selectively adjusting the fan according to the indoor ambient temperature at the end of the first preset time" specifically includes: and if the indoor environment temperature at the end of the first preset time is less than or equal to the first preset value, stopping the fan and continuing for a second preset time.
In a preferred embodiment of the above control method, the step of "selectively adjusting the fan according to the indoor ambient temperature at the end of the first preset time" further includes: and if the indoor environment temperature at the end of the first preset time is greater than the first preset value, keeping the fan running.
In a preferred technical solution of the above control method, after the step of "stopping the fan for a second preset time", the control method further includes: enabling the fan to operate for a third preset time; acquiring the indoor environment temperature at the beginning of the third preset time and the indoor environment temperature at the end of the third preset time; calculating the difference value between the indoor environment temperature at the end of the third preset time and the indoor environment temperature at the beginning of the third preset time; and selectively adjusting the fan according to the difference and the indoor environment temperature at the end of the third preset time.
In a preferred technical solution of the above control method, the step of "selectively adjusting the fan according to the difference and the indoor ambient temperature at the end of the third preset time" specifically includes: and if the difference value is less than or equal to a second preset value and the indoor environment temperature at the end of the third preset time is less than or equal to the third preset value, stopping the fan and continuing for a fourth preset time, wherein the fourth preset time is greater than the second preset time.
In a preferred technical solution of the above control method, the step of "selectively adjusting the fan according to the difference and the indoor ambient temperature at the end of the third preset time" further includes: and if the difference value is greater than the second preset value and the indoor environment temperature at the end of the third preset time is less than or equal to the third preset value, stopping the fan and continuing for a fifth preset time, wherein the fifth preset time is equal to the second preset time.
In a preferred technical solution of the above control method, the step of "selectively adjusting the fan according to the difference and the indoor ambient temperature at the end of the third preset time" further includes: and if the indoor environment temperature at the end of the third preset time is greater than the third preset value, keeping the fan running.
In a preferred technical solution of the above control method, the third preset value is equal to the first preset value.
In a preferred embodiment of the above control method, the first preset value is equal to 80% of a difference between the second preset temperature and the first preset temperature plus the first preset temperature.
In a preferred technical solution of the above control method, the second preset value is equal to 20% of a difference between the second preset temperature and the first preset temperature.
The technical scheme includes that when the air conditioner refrigerates, the compressor stops running due to the fact that the indoor environment temperature reaches the first preset temperature, the fan runs for the first preset time, the indoor environment temperature when the first preset time is over is obtained, the current indoor temperature can be judged according to the indoor environment temperature, whether the fan of the indoor unit needs to be adjusted or not is determined, the fan can be flexibly controlled through the arrangement, the fan can be stopped when the fan does not need to run, excessive energy consumption is avoided, the air conditioner is more energy-saving, and the fan can stop running, so that the fan cannot generate heat, indoor heat load is prevented from being increased, noise cannot be generated, and user experience is improved.
Further, under the condition that the indoor environment temperature is less than or equal to the first preset value when the first preset time is over, the indoor environment temperature does not have a large temperature rise, the fan of the indoor unit can be stopped to run at the moment, the energy waste is avoided, the air conditioner is energy-saving, meanwhile, the fan cannot generate heat and cannot bring the heat into the room, noise is not generated, and user experience is improved.
Further, under the condition that the indoor environment temperature is greater than the first preset value when the first preset time is over, the situation that the indoor environment temperature is greatly increased at the moment is shown, namely the indoor environment temperature is increased rapidly, the fan of the indoor unit is required to keep running at the moment, and the situation that the indoor environment temperature is abnormally fluctuated to influence the comfort of a user is avoided.
Furthermore, after the fan stops running and lasts for a second preset time, the fan starts running and lasts for a third preset time, the fan is selectively adjusted according to the difference value between the indoor environment temperature when the third preset time is over and the difference value between the indoor environment temperature when the third preset time is over, namely the fan can be flexibly controlled when the fan stops running at every time, namely the fan can be stopped running when the fan is not needed, excessive energy consumption is avoided, the air conditioner is more energy-saving, and the fan can be stopped, so that the fan cannot generate heat, the increase of indoor heat load is avoided, noise cannot be generated, and user experience is further improved.
Further, when the difference is smaller than or equal to the second preset value and the indoor environment temperature at the end of the third preset time is smaller than or equal to the third preset value, it indicates that the indoor heat load is small and the indoor environment temperature rises slowly, and at this time, the time for stopping the fan can be properly prolonged.
Further, when the difference is greater than the second preset value and the indoor environment temperature at the end of the third preset time is less than or equal to the third preset value, it indicates that the indoor heat load is medium at this time, the trend of the indoor environment temperature rising is large, the time of stopping the fan is inappropriately prolonged at this time, and the time should be consistent with the previous stopping time.
Further, under the condition that the indoor environment temperature at the end of the third preset time is greater than the third preset value, the situation that the indoor environment temperature is greatly increased at the moment is shown, namely the indoor environment temperature rises quickly, the fan of the indoor unit is required to keep running at the moment, and the situation that the indoor environment temperature is abnormally fluctuated to influence the comfort of a user is avoided.
Drawings
FIG. 1 is a flow chart of a control method of the present invention;
fig. 2 is a flow chart of an embodiment of the control method of the present invention.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that the terms "first", "second", "third", "fourth" and "fifth" in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Based on the problem that the fan control mode of the existing air conditioner pointed out by the background technology is not beneficial to energy conservation, increases indoor heat load and generates noise, and leads to poor user experience, the invention provides a control method for an air conditioner, which aims to avoid generating excessive energy consumption, enable the air conditioner to be more energy-saving, and enable the fan not to generate heat because the fan can stop rotating, avoid increasing indoor heat load and not generate noise, and further improve user experience.
Specifically, the air conditioner comprises an indoor unit, an outdoor unit, a compressor, an electronic expansion valve and a four-way valve, wherein the indoor unit, the outdoor unit, the compressor and the electromagnetic expansion valve form a closed refrigerant circulating system, and the four-way valve is configured to be capable of switching the flowing direction of a refrigerant in the refrigerant circulating system, so that the air conditioner can be switched between cooling and heating. As shown in fig. 1, the control method of the present invention includes: enabling a fan of the indoor unit to operate within a temperature interval formed by a first preset temperature and a second preset temperature and lasting for a first preset time; acquiring the indoor environment temperature at the end of the first preset time; and selectively adjusting the fan according to the indoor environment temperature when the first preset time is over, wherein the first preset temperature is the indoor environment temperature when the compressor stops operating when the air conditioner refrigerates, and the second preset temperature is the indoor environment temperature when the compressor starts operating when the air conditioner refrigerates. That is, when the air conditioner cools, the indoor ambient temperature will gradually decrease, and at this time, the compressor is always operated, when the indoor environment temperature reaches the first preset temperature, the compressor stops running, then the indoor environment temperature starts to rise again, when the indoor environment temperature rises to the second preset temperature, the compressor needs to be started again to enable the air conditioner to continue refrigerating, and by the mode, the indoor temperature is kept within a certain temperature range, thereby meeting the use requirements of users, the invention adds the judgment to the fan during the period of the indoor environment temperature rising again, so that the fan can be stopped for a period of time when the fan is not needed, the air conditioner is more energy-saving, if the fan is required, the fan may be continuously operated or restarted so that the indoor ambient temperature does not fluctuate greatly. The method comprises the steps of obtaining indoor environment temperature, detecting and obtaining the indoor environment temperature through a temperature sensor arranged on an air conditioner, or obtaining the indoor environment temperature through other household equipment, then transmitting the indoor environment temperature data to the air conditioner, or inputting the indoor environment temperature into the air conditioner through a manual input mode. In addition, in a general case, the first preset temperature is a temperature set by a user, and the second preset temperature is a temperature set by a system in advance, that is, when the user feels that the room is hot, the air conditioner is started to refrigerate, when the first preset temperature set by the user is reached, it is indicated that the indoor environment temperature reaches the use requirement of the user, the compressor of the air conditioner stops running, the air conditioner performs temporary refrigeration, and when the temperature gradually rises to the second preset temperature, the air conditioner needs to restart the compressor, so that the air conditioner restarts refrigeration.
It should be noted that, in the above description, the operation of the fan and the continuous first preset time in the temperature rise interval may be the continuous operation of the fan for the first preset time when the compressor is just stopped, or the continuous operation of the fan for the first preset time after the compressor is stopped for a certain time (that is, the fan has stopped at least once after the compressor stops operating).
Preferably, the step of "selectively adjusting the fan according to the indoor ambient temperature at the end of the first preset time" specifically includes: and if the indoor environment temperature at the end of the first preset time is less than or equal to the first preset value, stopping the fan and continuing for a second preset time. That is, in this case, the indoor ambient temperature does not greatly increase, and the blower may be stopped for a certain period of time.
Preferably, the step of "selectively adjusting the fan according to the indoor ambient temperature at the end of the first preset time" further comprises: and if the indoor environment temperature at the end of the first preset time is greater than the first preset value, keeping the fan running. That is, in this case, the indoor ambient temperature is already high, and the fan should continue to operate to avoid the abnormal fluctuation of the indoor ambient temperature.
It should be noted that, in practical application, a person skilled in the art may flexibly set the specific time of the first preset time and the specific time of the second preset time, as long as whether the fan needs to stop operating or not can be judged by the indoor ambient temperature when the first preset time of the fan operation ends, and energy saving can be achieved by stopping the fan for the second preset time.
In the present invention, if the start time of the first preset time is the time when the compressor just stops operating, that is, the first judgment of the fan is started after the compressor stops operating and the fan operates for the first preset time, it may also be judged whether the fan needs to be stopped for a prolonged period of time by introducing another parameter in the subsequent fan judgment, specifically, after the step of "stopping the fan and continuing for the second preset time", the control method of the present invention further includes: enabling the fan to operate for a third preset time; acquiring the indoor environment temperature at the beginning of the third preset time and the indoor environment temperature at the end of the third preset time; calculating the difference value between the indoor environment temperature at the end of the third preset time and the indoor environment temperature at the beginning of the third preset time; and selectively adjusting the fan according to the difference and the indoor environment temperature at the end of the third preset time. That is, whether the blower needs to be adjusted is determined in combination by the difference between the indoor ambient temperature at the end of the third preset time and the indoor ambient temperature at the start of the third preset time and the indoor ambient temperature at the end of the third preset time. The third preset time may be set to be equal to the first preset time, that is, the fan is enabled to operate for the same time in each judgment, and of course, the third preset time may also be set to be not equal to the first preset time.
Preferably, the step of "selectively adjusting the fan according to the difference and the indoor ambient temperature at the end of the third preset time" specifically includes: and if the difference value is less than or equal to a second preset value and the indoor environment temperature at the end of the third preset time is less than or equal to the third preset value, stopping the fan and continuing for a fourth preset time, wherein the fourth preset time is greater than the second preset time. That is, in this case, the heat load in the room is small, the temperature of the indoor environment rises slowly, and the fan stop time should be appropriately extended.
Preferably, the step of "selectively adjusting the fan according to the difference and the indoor ambient temperature at the end of the third preset time" further comprises: and if the difference value is greater than the second preset value and the indoor environment temperature at the end of the third preset time is less than or equal to the third preset value, stopping the fan and continuing for a fifth preset time, wherein the fifth preset time is equal to the second preset time. That is, in this case, the heat load in the room is moderate, the ambient temperature in the room tends to rise relatively much, and the previous fan off time should be maintained.
Preferably, the step of "selectively adjusting the fan according to the difference and the indoor ambient temperature at the end of the third preset time" further comprises: and if the indoor environment temperature at the end of the third preset time is greater than the third preset value, keeping the fan running. That is, in this case, the indoor ambient temperature is already high, and the fan should continue to operate to avoid the abnormal fluctuation of the indoor ambient temperature.
It should be noted that the third preset value may be set to be equal to the first preset value, that is, when the fan is determined each time, the indoor environment temperature when the fan runs for a certain period of time is compared with the same preset value each time, and then the fan is determined. Of course, the third preset value may also be set to be not equal to the first preset value, and a person skilled in the art may flexibly set a specific temperature value of the third preset value in practical applications.
The solution according to the invention is explained in detail below with reference to a most preferred embodiment, as shown in fig. 2.
Firstly, the indoor environment temperature is Tr, the first preset temperature is Ts, the second preset temperature is Ts + T0, and the first preset temperature and the second preset temperature form an indoor environment temperature rise interval with a temperature difference of T0, and in this embodiment, the fan of the indoor unit is intelligently controlled in the rise interval from Ts to (Ts + T0). Wherein, the first preset value and the third preset value are Ts +0.8 XT 0, and the second preset value is 0.2 XT 0.
Firstly, when Tr is less than or equal to Ts, namely the indoor environment temperature reaches a first preset temperature, the compressor stops running, the indoor fan continues air supply running for T0 seconds, the starting time of the room temperature Tr1 in a T0 time period and the ending time of the room temperature Tr2 are detected, the temperature rise in the T0 time period is delta T (Tr2-Tr1), if Tr2 is less than or equal to (Ts +0.8 multiplied by T0), the indoor fan stops running for T1 seconds, the whole unit enters a sleep stop state, and the whole unit is in the sleep state.
Then, if the fan is started again for T0 seconds after T1 seconds pass, if the detection time Delta T is less than or equal to 0.2T 0 and the detection time Tr2 is less than or equal to (Ts + 0.8X T0), increasing an extended shutdown time constant Delta T on the basis of the shutdown time length T1, namely the second dormancy shutdown time length is (T1+ Delta T); then the fan is started again for operation for t0 seconds, if the conditions are met, the time length of delta t is increased on the basis of the last shutdown time length, and the shutdown time length is prolonged until the longest shutdown time (t1+3 multiplied by delta t); in the above, if T1 seconds pass, the fan is started again for T0 seconds, and if Δ T > 0.2 × T0 is detected, but Tr2 is less than or equal to (Ts +0.8 × T0), the fan stop time is fixed to T1, and the Δ T shutdown time is not added on the basis of the last shutdown time.
In the above, if Tr2 > (Ts +0.8 × T0) is detected, the fan keeps the blowing operation and is not stopped.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (8)
1. A control method for an air conditioner including an indoor unit and a compressor, characterized by comprising:
enabling a fan of the indoor unit to operate within a temperature interval formed by a first preset temperature and a second preset temperature and lasting for a first preset time;
acquiring the indoor environment temperature at the end of the first preset time;
if the indoor environment temperature at the end of the first preset time is less than or equal to a first preset value, stopping the fan and continuing for a second preset time, and then enabling the fan to run and continue for a third preset time;
acquiring the indoor environment temperature at the beginning of the third preset time and the indoor environment temperature at the end of the third preset time;
calculating the difference value between the indoor environment temperature at the end of the third preset time and the indoor environment temperature at the beginning of the third preset time;
selectively adjusting the fan according to the difference and the indoor environment temperature at the end of the third preset time;
the first preset temperature is the indoor environment temperature when the air conditioner refrigerates and the compressor stops running, and the second preset temperature is the indoor environment temperature when the air conditioner refrigerates and the compressor starts running.
2. The control method according to claim 1,
and if the indoor environment temperature at the end of the first preset time is greater than the first preset value, keeping the fan running.
3. The control method according to claim 1, wherein the step of selectively adjusting the fan according to the difference and the indoor ambient temperature at the end of the third preset time specifically comprises:
if the difference value is less than or equal to a second preset value and the indoor environment temperature at the end of the third preset time is less than or equal to a third preset value, stopping the fan and continuing for a fourth preset time, wherein,
the fourth preset time is greater than the second preset time.
4. The control method of claim 3, wherein the step of selectively adjusting the fan based on the difference and the indoor ambient temperature at the end of the third predetermined time further comprises:
if the difference value is greater than the second preset value and the indoor environment temperature at the end of the third preset time is less than or equal to the third preset value, stopping the fan and continuing for a fifth preset time, wherein,
the fifth preset time is equal to the second preset time.
5. The control method of claim 3, wherein the step of selectively adjusting the fan based on the difference and the indoor ambient temperature at the end of the third predetermined time further comprises:
and if the indoor environment temperature at the end of the third preset time is greater than the third preset value, keeping the fan running.
6. The control method according to claim 3, characterized in that the third preset value is equal to the first preset value.
7. The control method according to claim 2, wherein the first preset value is equal to 80% of a difference between the second preset temperature and the first preset temperature plus the first preset temperature.
8. The control method according to claim 3, characterized in that said second preset value is equal to 20% of the difference between said second preset temperature and said first preset temperature.
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| CN201811159931.0A CN109556243B (en) | 2018-09-30 | 2018-09-30 | Control method for air conditioner |
| PCT/CN2019/090353 WO2020062920A1 (en) | 2018-09-30 | 2019-06-06 | Control method for air conditioner |
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| CN201811159931.0A CN109556243B (en) | 2018-09-30 | 2018-09-30 | Control method for air conditioner |
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| CN109556243B true CN109556243B (en) | 2021-05-25 |
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| US10385254B2 (en) | 2017-07-27 | 2019-08-20 | Saudi Arabian Oil Company | Ecofriendly emulsifier synthesis from esterified waste vegetable oil for wellbore drilling fluids |
| CN109556243B (en) * | 2018-09-30 | 2021-05-25 | 青岛海尔空调电子有限公司 | Control method for air conditioner |
| CN113137719B (en) * | 2021-03-10 | 2023-06-20 | 海信空调有限公司 | Air conditioner and control method |
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| WO2020062920A1 (en) | 2020-04-02 |
| CN109556243A (en) | 2019-04-02 |
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