CN113467549B - Air disinfection purifier and filter screen temperature control method thereof - Google Patents
Air disinfection purifier and filter screen temperature control method thereof Download PDFInfo
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- CN113467549B CN113467549B CN202110792947.0A CN202110792947A CN113467549B CN 113467549 B CN113467549 B CN 113467549B CN 202110792947 A CN202110792947 A CN 202110792947A CN 113467549 B CN113467549 B CN 113467549B
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- G05D23/19—Control of temperature characterised by the use of electric means
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Abstract
The utility model relates to an air disinfection clarifier and air disinfection clarifier's filter screen temperature control method, when reaching the intensification control condition, the first heating duty cycle is confirmed to the temperature deviation developments between filter screen current temperature and the target disinfection temperature based on the filter screen, and in the heating cycle according to opening and closing of the nimble control heater of first heating duty cycle, in order to realize the nimble control to filter screen heating process, thereby make the filter screen temperature can be faster, accurate and stable approach to target disinfection temperature, so that when disinfecting the disinfection based on this filter screen temperature that approaches to target disinfection temperature, can reach better disinfection effect of disinfecting.
Description
Technical Field
The application relates to the technical field of air disinfection and purification, in particular to an air disinfection purifier and a filter screen temperature control method thereof.
Background
The air is usually diffused with various pollutants harmful to human health, such as viruses, bacteria and various particles, so that the air is generally accepted by people for disinfection and purification. Traditional air disinfection clarifier adopts ultraviolet lamp or ozone etc. to kill with virus etc. the bacterium on the filter screen usually, and current adoption physics high temperature heating disinfects sterile air disinfection clarifier, owing to can not accurate control filter screen temperature, has the relatively poor problem of disinfection effect of disinfecting.
Disclosure of Invention
Accordingly, it is desirable to provide an air sterilizer and a method for controlling a temperature of a filter screen of an air sterilizer, which can improve a sterilization effect, in view of the above-mentioned problems.
An air sanitizer purifier comprising:
a housing, and enclosed within the housing:
filtering with a screen;
the temperature sensor is arranged on one side of the filter screen and used for collecting the temperature of the filter screen;
the fan enables air to be disinfected and purified to flow through the filter screen;
the heater is used for heating the filter screen; and a process for the preparation of a coating,
the controller, with the temperature sensor electricity is connected, acquires the filter screen current temperature of filter screen, when reaching the intensification control condition, based on the temperature deviation between filter screen current temperature and the target disinfection temperature confirms first heating duty cycle, control the heater is according to in the heating cycle first heating duty cycle is compared the filter screen heats, in order to control the temperature of filter screen.
In one embodiment, the temperature rise control condition includes: the temperature deviation between the current temperature of the filter screen and the target disinfection temperature is smaller than a first threshold value.
In one embodiment, the controller determines a first heating duty ratio based on a temperature deviation between the current temperature of the filter screen and a target sterilization temperature when a temperature maintaining control condition is reached, and controls the heater to heat the filter screen according to the first heating duty ratio in a heating period so as to control the temperature of the filter screen; the temperature maintaining control conditions comprise: the temperature deviation between the current temperature of the filter screen and the target disinfection temperature is larger than or equal to a first threshold value and smaller than or equal to a second threshold value, and the second threshold value is larger than the first threshold value.
In one embodiment, the controller detects an operation mode of the fan in a process of controlling the heater to heat the filter screen at a temperature maintaining state, determines a second heating duty ratio based on a manual mode when the operation mode is detected to be switched to the manual mode, and controls the heater to heat the filter screen according to the second heating duty ratio in the heating period so as to control the temperature of the filter screen.
In one embodiment, the controller determines a first heating duty ratio based on a temperature deviation between the current temperature of the filter screen and a target sterilization temperature when the operation mode is detected to be switched to the automatic mode and it is determined that a temperature maintaining control condition is reached, and controls the heater to heat the filter screen at the first heating duty ratio during a heating period to control the temperature of the filter screen.
In one embodiment, the controller controls the heater to stop heating the filter screen when a heating stop condition is reached.
In one embodiment, the heating stop condition includes: the temperature deviation between the current temperature of the filter screen and the target disinfection temperature is greater than a second threshold value, or a fault signal is detected, or the filter screen is detected to be missing.
A method of controlling the temperature of a filter screen of an air sanitizer, the method comprising:
acquiring the current temperature of a filter screen of the filter screen;
when a temperature rise control condition is reached, determining a first heating duty ratio based on a temperature deviation between the current temperature of the filter screen and a target disinfection temperature;
and controlling the heater to heat the filter screen according to the first heating duty ratio in a heating period so as to control the temperature of the filter screen.
In one embodiment, the temperature rise control condition includes: the temperature deviation between the current temperature of the filter screen and the target disinfection temperature is smaller than a first threshold value.
In one embodiment, the method further comprises:
when a temperature maintenance control condition is reached, determining a first heating duty ratio based on a temperature deviation between the current temperature of the filter screen and a target disinfection temperature;
controlling the heater to heat the filter screen according to the first heating duty ratio in a heating period so as to control the temperature of the filter screen;
the temperature maintaining control conditions comprise: the temperature deviation between the current temperature of the filter screen and the target disinfection temperature is larger than or equal to a first threshold value and smaller than or equal to a second threshold value, and the second threshold value is larger than the first threshold value.
In one embodiment, the method further comprises:
detecting the operation mode of the fan in the process of controlling the heater to heat the filter screen at the temperature maintaining state;
upon detecting a switch in the operating mode to a manual mode, determining a second heating duty cycle based on the manual mode;
and controlling the heater to heat the filter screen according to the second heating duty ratio in the heating period so as to control the temperature of the filter screen.
In one embodiment, the method further comprises:
when the operation mode is detected to be switched to the automatic mode and the temperature maintaining control condition is judged to be reached, determining a first heating duty ratio based on the temperature deviation between the current temperature of the filter screen and the target disinfection temperature;
and controlling the heater to heat the filter screen according to the first heating duty ratio in a heating period so as to control the temperature of the filter screen.
In one embodiment, the method further comprises:
and when the heating stop condition is reached, controlling the heater to stop heating the filter screen.
In one embodiment, the heating stop condition includes: the temperature deviation between the current temperature of the filter screen and the target disinfection temperature is greater than a second threshold value, or a fault signal is detected, or the filter screen is detected to be missing.
According to the air disinfection purifier and the filter screen temperature control method thereof, when the temperature rise control condition is reached, the first heating duty ratio is dynamically determined based on the temperature deviation between the current temperature of the filter screen and the target disinfection temperature, and the heater is flexibly controlled to be turned on and off according to the first heating duty ratio in the heating period, so that the filter screen heating process is flexibly controlled, the filter screen temperature can be more quickly, accurately and stably approached to the target disinfection temperature, and when the filter screen temperature approached to the target disinfection temperature is used for sterilization and disinfection, a better sterilization and disinfection effect can be achieved. Further, the filter screen is heated according to a first heating duty ratio determined based on the current temperature of the filter screen and the target disinfection temperature in a heating period through controlling the heater, the filter screen is not always heated in the whole disinfection process, the energy-saving effect can be achieved, and therefore the better sterilization and disinfection effects can be achieved while energy is saved.
Drawings
FIG. 1 is a schematic diagram of an embodiment of an air sanitizer purifier;
FIG. 2 is a schematic view showing the construction of an air sterilizer according to another embodiment;
FIG. 3 is a schematic flow chart illustrating a method for controlling the temperature of a filter screen of an air sterilizer according to one embodiment;
FIG. 4 is a flow chart illustrating a method for controlling a temperature of a filter screen of an air sterilizer according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further 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 present application and are not intended to limit the present application.
In one embodiment, as shown in FIG. 1, a schematic diagram of an air sanitizer purifier is provided. Referring to fig. 1, the air sterilizer includes a housing, and enclosed within the housing: filtering with a screen; the temperature sensor is arranged on one side of the filter screen and used for collecting the temperature of the filter screen; the fan enables air to be disinfected and purified to flow through the filter screen; the heater is used for heating the filter screen; the controller, with the temperature sensor electricity is connected, acquires the filter screen current temperature of filter screen, when reaching the intensification control condition, based on the temperature deviation between filter screen current temperature and the target disinfection temperature confirms first heating duty cycle, control the heater is according to in the heating cycle first heating duty cycle is compared the filter screen heats, in order to control the temperature of filter screen.
It should be noted that the structure of each component of the air sterilizer shown in fig. 1 and the arrangement position of the controller are only examples and are not intended to be limiting.
The current temperature of the filter screen refers to a corresponding temperature of the filter screen in the current heating period, and specifically may be an average temperature of temperatures of a plurality of filter screens in the current heating period, or may be a temperature of the filter screen acquired at a single time in the current heating period, for example, a temperature of the filter screen acquired at an end time point of the current heating period. The temperature rise control condition is a condition or basis for judging whether to control the heater to heat the filter screen, and specifically may be that a temperature deviation between the current temperature of the filter screen and the target disinfection temperature is smaller than a first threshold. The temperature deviation is a temperature difference between the current temperature of the filter screen and the target disinfection temperature, and can be obtained by subtracting the target disinfection temperature from the current temperature of the filter screen. The target sterilization temperature is a temperature capable of inactivating a target object to be sterilized and sterilized, and may be specifically determined according to a characteristic parameter of the target object, where the characteristic parameter of the target object includes an inactivation temperature, and may further include a time period for which the inactivation temperature needs to be maintained. Taking the target object as a new coronavirus as an example, the new coronavirus is completely inactivated after being maintained for half an hour at an inactivation temperature of about 60 degrees, so that the target disinfection temperature can be determined to be 60 degrees.
The heating duty ratio refers to a ratio between an on-period and an off-period of the heater. The heating period refers to the minimum metering unit for controlling the opening and closing of the heater according to the heating duty ratio, and can be customized according to the actual condition. The on-time and off-time of the heater in the corresponding heating period can be determined based on the heating duty ratio, for example, the heating period is Ts, the heating duty ratio is 7: 3, the start time and the off time of the heater are 0.7 × Ts and 0.3 × Ts, respectively.
Specifically, the controller determines the current temperature of the filter screen based on the temperature collected and sent by the temperature sensor for the filter screen, judges whether a temperature rise control condition is reached based on the current temperature of the filter screen and a target disinfection temperature, determines the temperature deviation between the current temperature of the filter screen and the target disinfection temperature when the temperature rise control condition is reached, determines a first heating duty ratio based on the temperature deviation, and controls the heater to heat the filter screen according to the first heating duty ratio in a heating period so as to control the filter screen to rise temperature stably.
In one embodiment, the controller corrects the temperature deviation between the current temperature of the filter screen and the target sterilization temperature to obtain a corrected temperature deviation after determining the temperature deviation, and determines the first heating duty ratio based on the corrected temperature deviation.
In one embodiment, the controller corrects the temperature deviation between the current temperature of the filter screen and the target sterilization temperature based on the set PID (P (proportional, I (integral), D (derivative)) parameters. Wherein the PID parameter is determined based on the target sterilization temperature. Therefore, the PID parameter is determined according to the target disinfection temperature, so that when the first heating duty ratio is determined according to the PID parameter and the temperature deviation and the heater is controlled according to the first heating duty ratio to heat the filter screen, the rapidness, the accuracy and the stability of the temperature rise of the filter screen can be guaranteed. It can be understood that by setting the proportional element (P) in the PID parameter to be large enough and the integral element (I) and the differential element (D) to be reasonable, the temperature of the filter screen can be made to be basically free from overshoot ((peak value of filter screen temperature-target disinfection temperature)/target disinfection temperature), and the steady-state error between the temperature of the filter screen and the target disinfection temperature can be made to be small enough. Therefore, the rapidity of the temperature rise of the filter screen can be guaranteed, the temperature of the filter screen cannot be instantly impacted too high to cause the filter screen to directly exit the temperature maintenance stage and enter the heat dissipation stage.
In one embodiment, the controller is electrically connected or networked with the temperature sensor. The controller is electrically connected with the driver of the heater. The driver of the heater is used for responding to the control signal of the controller so as to control the on and off of the heater. Such as a heater off signal or a heater on signal.
In one embodiment, the controller receives one or more temperatures collected by the temperature sensor for the filter screen in a current heating period, and obtains a current temperature of the filter screen corresponding to the filter screen in the current heating period based on the received one or more temperatures. Further, after the controller determines a first heating duty ratio based on the current temperature of the filter screen corresponding to the current heating period, in the next heating period, the controller controls the heater to heat the filter screen according to the first heating duty ratio.
Above-mentioned air disinfection clarifier, when reaching the intensification control condition, the first heating duty cycle is confirmed to the temperature deviation developments between filter screen current temperature and the target disinfection temperature based on the filter screen, and in heating cycle according to opening and closing of the nimble control heater of first heating duty cycle, in order to realize the nimble control to filter screen heating process, thereby make the filter screen temperature can be faster, accurate and stable approach to target disinfection temperature, in order to be convenient for when disinfecting the disinfection based on this filter screen temperature that approaches to target disinfection temperature, can reach better disinfection effect of disinfecting. Further, the filter screen is heated according to a first heating duty ratio determined based on the current temperature of the filter screen and the target disinfection temperature in a heating period through controlling the heater, the filter screen is not always heated in the whole disinfection process, the energy-saving effect can be achieved, and therefore the better sterilization and disinfection effects can be achieved while energy is saved.
In one embodiment, as shown in FIG. 2, a schematic diagram of an air sanitizer purifier is provided. Referring to fig. 2, the air sterilizer includes a housing, and enclosed within the housing: filtering with a screen; the temperature sensor is arranged on one side of the filter screen and used for collecting the temperature of the filter screen; the fan enables air to be disinfected and purified to flow through the filter screen; the heater is used for heating the filter screen; the controller is electrically connected with the temperature sensor, acquires the current temperature of the filter screen, determines a first heating duty ratio based on the temperature deviation between the current temperature of the filter screen and the target disinfection temperature when the temperature rise control condition is reached, and controls the heater to heat the filter screen according to the first heating duty ratio in a heating period so as to control the temperature of the filter screen; still be provided with control panel and air outlet on the casing, control panel can be used to opening and closing of air disinfection clarifier, still can show relevant control information to the user, and the control after the filter screen disinfection purifies is discharged from the air outlet. It should be noted that the structure of each component of the air sterilization purifier and the arrangement position of the controller shown in fig. 2 are only examples and are not limited in particular.
In one embodiment, the controller determines that the temperature-increasing control condition is reached when a temperature deviation between a current temperature of the filter screen and a target sterilization temperature is less than a first threshold value.
The first threshold is a negative temperature threshold, and can be customized according to the situation. Specifically, the controller calculates the temperature deviation between the current temperature of the filter screen and the target disinfection temperature, compares the temperature deviation with a set first threshold value, and when the temperature deviation is smaller than the first threshold value, the current temperature of the filter screen is sufficiently smaller than the target disinfection temperature, the temperature rise control condition is determined to be reached, so that a first heating duty ratio is dynamically determined based on the temperature deviation, and the heater is controlled to heat the filter screen according to the first heating duty ratio.
In the above embodiment, when the temperature deviation between the current temperature of the filter screen and the target sterilization temperature is smaller than the first threshold, it is determined that the temperature rise control condition is reached, and the heater is controlled to heat the filter screen based on the temperature deviation, so that the control of the temperature of the filter screen is more accurate.
In one embodiment, the controller determines a first heating duty ratio based on a temperature deviation between the current temperature of the filter screen and a target sterilization temperature when a temperature maintaining control condition is reached, and controls the heater to heat the filter screen according to the first heating duty ratio in a heating period so as to control the temperature of the filter screen; the temperature maintaining control conditions comprise: the temperature deviation between the current temperature of the filter screen and the target disinfection temperature is larger than or equal to a first threshold value and smaller than or equal to a second threshold value, and the second threshold value is larger than the first threshold value.
The temperature maintaining control condition is a condition or basis for judging whether to control the heater to maintain the temperature of the filter screen, and specifically may be that a temperature deviation between the current temperature of the filter screen and the target disinfection temperature is greater than or equal to a first threshold and less than or equal to a second threshold, where the second threshold is greater than the first threshold. The second threshold is a temperature threshold of a positive value, and can be customized according to the situation.
Specifically, the controller compares the temperature deviation between the current temperature of the filter screen and the target sterilization temperature with a first threshold value and a second threshold value respectively, determines that a temperature maintenance control condition is reached when the temperature deviation is greater than the first threshold value and less than the second threshold value, determines a first heating duty ratio based on the temperature deviation, and controls the heater to heat the filter screen according to the determined first heating duty ratio in a heating period so as to control the temperature of the filter screen.
In the above embodiment, when the temperature deviation between the current temperature of the filter screen and the target sterilization temperature is within the threshold range determined by the first threshold and the second threshold, it represents that the current temperature of the filter screen reaches the temperature capable of inactivating the target object to be sterilized and sterilized on the filter screen, and the first heating duty ratio is determined based on the temperature deviation between the current temperature of the filter screen and the target sterilization temperature, so that when the heater is controlled according to the first heating duty ratio to heat the filter screen for maintaining the temperature, the temperature of the filter screen can be maintained within the set sterilization temperature range, and the sterilization temperature range is determined based on the target sterilization temperature, the first threshold and the second threshold, so as to achieve continuous sterilization and disinfection, and thus the sterilization and disinfection effects are better.
In one embodiment, the controller detects an operation mode of the fan in a process of controlling the heater to heat the filter screen at a temperature maintaining state, determines a second heating duty ratio based on a manual mode when the operation mode is detected to be switched to the manual mode, and controls the heater to heat the filter screen according to the second heating duty ratio in the heating period so as to control the temperature of the filter screen.
The running mode of the fan comprises an automatic mode and a manual mode. When the fan is in the automatic mode, the fan can be based on the dust value automatic adjustment fan rotational speed that detects. The manual mode comprises a high-speed mode, a medium-speed mode and a low-speed mode, and when the fan is in the high-speed mode, the medium-speed mode or the low-speed mode, the rotating speed of the fan is fixed and unchanged.
Specifically, the controller controls the heater to perform temperature maintenance heating on the filter screen according to the determined heating duty ratio (a first heating duty ratio or a second heating duty ratio), namely detects the operation mode of the fan in real time in a temperature maintenance control stage, determines a second heating duty ratio corresponding to a manual mode when the operation mode of the fan is detected to be switched to the manual mode, and controls the heater to heat the filter screen according to the second heating duty ratio in a heating period so as to maintain the temperature of the filter screen near a target disinfection temperature.
In one embodiment, the controller determines the second heating duty ratio based on a type of the manual mode switched to when it is detected that the operation mode of the fan is switched from the automatic mode to the manual mode, or determines the second heating duty ratio based on a rotational speed of the fan in the manual mode switched to. When the controller detects that the operation mode of the fan is switched from one type of manual mode to another type of manual mode, the controller determines the heating duty ratio corresponding to the another type of manual mode as the second heating duty ratio, for example, when the fan is detected to be switched from the high-speed mode to the medium-speed mode, the controller determines the heating duty ratio corresponding to the medium-speed mode as the second heating duty ratio.
For example, the controller may specifically determine the second heating duty cycle based on the type of manual mode with reference to the following table. Because the fan rotational speed is different under the manual mode of different grade type, from this, can be correlated with the fan rotational speed under each manual mode with second heating duty cycle to reach the effect of accurate accuse temperature.
| Operation mode of fan | Rotating speed of fan | Second heating duty cycle |
| Low speed mode | R1/min | 1：9 |
| Medium speed mode | R3/min | 5：5 |
| High speed mode | R5/min | 9：1 |
In the above embodiment, when the operation mode of fan changes, the fan rotational speed also can change along with it, and the fan rotational speed can influence the radiating effect of fan to the filter screen when changing, also can accelerate or slow down the filter screen heat dissipation, therefore, when the operation mode of fan switches to the fixed manual mode of fan rotational speed, confirm the second heating duty cycle based on the manual mode, so that when carrying out temperature maintenance heating to the filter screen according to second heating duty cycle control heater, can be based on the duty cycle that the flexible control heater of fan rotational speed opened and closed, thereby can be better maintain the filter screen temperature in the threshold value scope, so that the effect of disinfecting is more excellent.
In one embodiment, the controller determines a first heating duty ratio based on a temperature deviation between the current temperature of the filter screen and a target sterilization temperature when the operation mode is detected to be switched to the automatic mode and it is determined that the temperature maintaining control condition is reached, and controls the heater to heat the filter screen at the first heating duty ratio during a heating period to control the temperature of the filter screen.
Specifically, the controller controls the heater to perform temperature maintenance heating on the filter screen based on the determined heating duty ratio, detects the operation mode of the fan in real time, judges whether a temperature maintenance control condition is reached based on the current temperature of the filter screen and the target disinfection temperature when the operation mode of the fan is detected to be switched from the manual mode to the automatic mode, determines a first heating duty ratio based on the temperature deviation between the current temperature of the filter screen and the target disinfection temperature when the temperature maintenance control condition is reached, and controls the heater to perform temperature maintenance heating on the filter screen according to the determined first heating duty ratio in a heating period so as to maintain the temperature of the filter screen within a set disinfection temperature range, thereby realizing continuous sterilization and disinfection.
In the above-mentioned embodiment, because under the automatic mode, the fan rotational speed can be along with waiting to disinfect the dust value dynamic adjustment in the air of purification, from this, when the running mode of fan switches to the automatic mode, confirm first heating duty cycle based on the temperature difference between current temperature of filter screen and the target disinfection temperature, so that when carrying out the temperature maintenance heating to the filter screen based on first heating duty cycle control heater, can accurately maintain the temperature of filter screen in the disinfection temperature range of setting for, in order to realize lasting and effectual disinfection of disinfecting, thereby can improve the disinfection effect of disinfecting.
In one embodiment, the controller controls the heater to stop heating the filter screen when a heating stop condition is reached.
The heating stop condition is a condition or basis for judging whether to control the heater to stop heating the filter screen, and specifically may be that a temperature deviation between the current temperature of the filter screen and the target disinfection temperature is greater than a second threshold, or a fault signal is detected, or a filter screen is detected to be absent.
In one embodiment, when the heating stopping condition is determined to be reached, the heater is controlled to stop heating the filter screen, the fan is controlled to operate according to the current fan rotating speed to radiate heat to the filter screen, timing is started, and when the timing duration is longer than or equal to a preset duration or when the current temperature of the filter screen is detected to be smaller than or equal to a third threshold value, the fan is controlled to stop operating to stop radiating heat to the filter screen. The preset duration can be customized according to actual conditions. The third threshold may specifically be any value smaller than the first threshold.
In the above embodiment, when it is determined that the heating stop condition is reached, the heater is controlled to stop heating the filter net, so as to avoid damage to one or more components in the air sterilizer or inefficient operation, and to avoid a problem of energy waste caused by performing an unnecessary heating process.
In one embodiment, the heating stop condition includes: the temperature deviation between the current temperature of the filter screen and the target disinfection temperature is greater than a second threshold value, or a fault signal is detected, or the filter screen is detected to be missing.
The fault signal is used for representing that the air disinfection purifier breaks down in the operation process, the faults of the air disinfection purifier are various and include but are not limited to high-voltage faults, motor stalling faults, dust sensor faults, communication faults between a main board and a display panel and the like. The absence of the filter screen means that the filter screen in the air disinfection purifier is removed or that the filter screen is not present in the air disinfection purifier.
Specifically, the controller compares the temperature difference between the current temperature of the filter screen and the target disinfection temperature with a second threshold, and when the temperature difference is greater than the second threshold, the heating stop condition is determined to be reached, the heating stop condition at the moment can also be understood as a heat dissipation control condition, and then the heater is controlled to stop heating the filter screen, so that heat dissipation of the filter screen is realized. The controller detects the fault signal in real time in the whole temperature control process of the filter screen, and judges that the heating stop condition is reached when the fault signal is detected. The controller judges whether the filter screen is lost in real time in the whole filter screen temperature control process, and judges that the heating stop condition is reached when the filter screen is judged to be lost.
In one embodiment, the air disinfection purifier further comprises a pressure-sensitive sensor which is connected with the controller and is packaged in the shell, and the pressure-sensitive sensor is used for detecting whether the filter screen is missing or not and sending a filter screen missing signal to the controller when the filter screen is missing. And when the controller receives the filter screen missing signal, judging that the heating stop condition is reached.
In the above embodiment, when the current temperature of the filter screen is over-temperature, a fault signal is detected or the filter screen is absent, the heater is controlled to stop heating the filter screen, so that the effects of protecting each component of the air purifier and saving energy are achieved.
In one embodiment, when the air disinfection purifier enters an operating state, a temperature judging stage of controlling the temperature of the filter screen is started, a controller in the air disinfection purifier acquires the initial temperature of the filter screen as the current temperature of the filter screen, when the temperature difference deviation between the current temperature of the filter screen and a target disinfection temperature is larger than a second threshold value, the controller judges that a heat dissipation control stage is entered, a heating stop condition is judged to be reached, a heater is controlled to stop heating to dissipate heat of the filter screen, when the temperature deviation is smaller than the first threshold value, the temperature rising control stage is judged to be entered, a first heating duty ratio is determined to be reached based on the temperature deviation, the heater is controlled to heat the filter screen according to the first heating duty ratio, and when the temperature deviation is larger than or equal to the first threshold value and smaller than or equal to the second threshold value, the controller judges that a temperature maintaining control stage is entered, and judging that a temperature maintaining control condition is reached, determining a first heating duty ratio based on the temperature deviation, and controlling a heater to maintain the temperature of the filter screen according to the first heating duty ratio. Wherein the absolute values of the first threshold and the second threshold are equal. Thus, in the temperature determination stage, the controller determines which filter screen temperature control stage should be entered according to the following table based on the current filter screen temperature and the target sterilization temperature. Wherein, -X represents a first threshold value and + X represents a second threshold value.
| Initial temperature condition discrimination | Required entry phase |
| Initial temperature<Target Disinfection temperature-X | Temperature raising control stage |
| Target disinfectiontemperature-X<Initial temperature<Target sterilization temperature + X | Temperature maintaining control stage |
| Initial temperature>Target sterilization temperature + X | Stage of heat dissipation control |
In the temperature rise control stage, the current temperature of the filter screen is dynamically acquired, when the temperature deviation between the current temperature of the filter screen and the target disinfection temperature is smaller than a first threshold value, the filter screen is judged to be still in the temperature rise control stage, the temperature rise control condition is judged to be reached, when the temperature deviation is larger than or equal to the first threshold value and smaller than or equal to a second threshold value, the filter screen exits from the temperature rise control stage, the temperature maintenance control stage is entered, and the temperature maintenance control condition is judged to be reached. Similarly, in the temperature maintaining control stage, the current temperature of the filter screen is dynamically acquired, when the temperature deviation between the current temperature of the filter screen and the target disinfection temperature is greater than or equal to a first threshold value and less than or equal to a second threshold value, the filter screen is judged to be still in the temperature maintaining control stage, and the temperature maintaining control condition is judged to be reached. And in the temperature maintenance control stage, the operation mode of the fan is detected in real time, when the operation mode of the fan is detected to be switched to the manual mode, the second heating duty ratio is determined based on the manual mode, and when the operation mode of the fan is detected to be switched to the automatic mode, the first heating duty ratio is determined based on the temperature deviation between the current temperature of the filter screen and the target disinfection temperature.
And in the temperature maintenance control stage, when a shutdown instruction is detected, judging that the heat dissipation control stage is entered and a heating stop condition is reached. And in the heat dissipation control stage, the heater is controlled to stop heating the filter screen, and the fan is controlled to operate according to the current fan rotating speed so as to dissipate heat of the filter screen.
In one embodiment, as shown in fig. 3, a method for controlling the temperature of a filter screen of an air sterilizer is provided, which is exemplified by the controller in fig. 1, and comprises the following steps:
s302, obtaining the current temperature of the filter screen.
The current temperature of the filter screen refers to a corresponding temperature of the filter screen in the current heating period, and specifically may be an average temperature of temperatures of a plurality of filter screens in the current heating period, or may be a temperature of the filter screen acquired at a single time in the current heating period, for example, a temperature of the filter screen acquired at an end time point of the current heating period.
Specifically, the controller determines the current temperature of the screen based on the temperature collected and sent by the temperature sensor for the screen.
In one embodiment, the controller receives one or more temperatures collected by the temperature sensor for the filter screen in a current heating period, and obtains a current temperature of the filter screen corresponding to the filter screen in the current heating period based on the received one or more temperatures. Further, after the controller determines a first heating duty ratio based on the current temperature of the filter screen corresponding to the current heating period, in the next heating period, the controller controls the heater to heat the filter screen according to the first heating duty ratio.
And S304, when the temperature rise control condition is reached, determining a first heating duty ratio based on the temperature deviation between the current temperature of the filter screen and the target disinfection temperature.
The temperature rise control condition is a condition or basis for judging whether to control the heater to heat the filter screen, and specifically may be that a temperature deviation between the current temperature of the filter screen and the target disinfection temperature is smaller than a first threshold. The temperature deviation is a temperature difference between the current temperature of the filter screen and the target disinfection temperature, and can be obtained by subtracting the target disinfection temperature from the current temperature of the filter screen. The target sterilization temperature is a temperature capable of inactivating a target object to be sterilized and sterilized, and may be specifically determined according to a characteristic parameter of the target object, where the characteristic parameter of the target object includes an inactivation temperature, and may further include a time period for which the inactivation temperature needs to be maintained. Taking the target object as a new coronavirus as an example, the new coronavirus is completely inactivated after being maintained for half an hour at an inactivation temperature of about 60 degrees, so that the target disinfection temperature can be determined to be 60 degrees.
The heating duty ratio refers to a ratio between an on-period and an off-period of the heater. The heating period refers to the minimum metering unit for controlling the opening and closing of the heater according to the heating duty ratio, and can be customized according to the actual condition. The on-time and off-time of the heater in the corresponding heating period can be determined based on the heating duty ratio, for example, the heating period is Ts, the heating duty ratio is 7: 3, the start time and the off time of the heater are 0.7 × Ts and 0.3 × Ts, respectively.
Specifically, the controller judges whether a temperature rise control condition is reached based on the current temperature of the filter screen and the target sterilization temperature, determines a temperature deviation between the current temperature of the filter screen and the target sterilization temperature when it is judged that the temperature rise control condition is reached, and determines a first heating duty ratio based on the temperature deviation so as to control the heater to heat the filter screen according to the first heating duty ratio in a heating cycle.
In one embodiment, the controller corrects the temperature deviation between the current temperature of the filter screen and the target sterilization temperature to obtain a corrected temperature deviation after determining the temperature deviation, and determines the first heating duty ratio based on the corrected temperature deviation.
In one embodiment, the controller corrects the temperature deviation between the current temperature of the filter screen and the target sterilization temperature based on the set PID (P (proportional, I (integral), D (derivative)) parameters. Wherein the PID parameter is determined based on the target sterilization temperature. Therefore, the PID parameter is determined according to the target disinfection temperature, so that when the first heating duty ratio is determined according to the PID parameter and the temperature deviation and the heater is controlled according to the first heating duty ratio to heat the filter screen, the rapidness, the accuracy and the stability of the temperature rise of the filter screen can be guaranteed. It can be understood that by setting the proportional element (P) in the PID parameter to be large enough and the integral element (I) and the differential element (D) to be reasonable, the temperature of the filter screen can be made to be basically free from overshoot ((peak value of filter screen temperature-target disinfection temperature)/target disinfection temperature), and the steady-state error between the temperature of the filter screen and the target disinfection temperature can be made to be small enough. Therefore, the rapidity of the temperature rise of the filter screen can be guaranteed, the temperature of the filter screen cannot be instantly impacted too high to cause the filter screen to directly exit the temperature maintenance stage and enter the heat dissipation stage.
S306, controlling the heater to heat the filter screen according to the first heating duty ratio in a heating period so as to control the temperature of the filter screen.
Specifically, the controller controls the heater to heat the filter screen according to a first heating duty ratio in a heating period after determining the first heating duty ratio based on the temperature deviation, so as to control the filter screen to be heated stably.
According to the filter screen temperature control method of the air disinfection purifier, when the temperature rise control condition is reached, the first heating duty ratio is dynamically determined based on the temperature deviation between the current temperature of the filter screen and the target disinfection temperature, the heater is flexibly controlled to be turned on and off according to the first heating duty ratio in the heating period, so that the filter screen heating process is flexibly controlled, the filter screen temperature can be more quickly, accurately and stably approached to the target disinfection temperature, and when the filter screen temperature approaching to the target disinfection temperature is used for sterilization and disinfection, a better sterilization and disinfection effect can be achieved. Further, the filter screen is heated according to a first heating duty ratio determined based on the current temperature of the filter screen and the target disinfection temperature in a heating period through controlling the heater, the filter screen is not always heated in the whole disinfection process, the energy-saving effect can be achieved, and therefore the better sterilization and disinfection effects can be achieved while energy is saved.
In one embodiment, the temperature-rise control condition includes: the temperature deviation between the current temperature of the filter screen and the target disinfection temperature is smaller than a first threshold value.
The first threshold is a negative temperature threshold, and can be customized according to the situation. Specifically, the controller calculates the temperature deviation between the current temperature of the filter screen and the target disinfection temperature, compares the temperature deviation with a set first threshold value, and when the temperature deviation is smaller than the first threshold value, the current temperature of the filter screen is sufficiently smaller than the target disinfection temperature, the temperature rise control condition is determined to be reached, so that a first heating duty ratio is dynamically determined based on the temperature deviation, and the heater is controlled to heat the filter screen according to the first heating duty ratio.
In the above embodiment, when the temperature deviation between the current temperature of the filter screen and the target sterilization temperature is smaller than the first threshold, it is determined that the temperature rise control condition is reached, and the heater is controlled to heat the filter screen based on the temperature deviation, so that the control of the temperature of the filter screen is more accurate.
In one embodiment, the method for controlling the temperature of the filter screen further includes: when a temperature maintenance control condition is reached, determining a first heating duty ratio based on a temperature deviation between the current temperature of the filter screen and a target disinfection temperature; controlling the heater to heat the filter screen according to the first heating duty ratio in a heating period so as to control the temperature of the filter screen; the temperature maintaining control conditions comprise: the temperature deviation between the current temperature of the filter screen and the target disinfection temperature is larger than or equal to a first threshold value and smaller than or equal to a second threshold value, and the second threshold value is larger than the first threshold value.
The temperature maintaining control condition is a condition or basis for judging whether to control the heater to maintain the temperature of the filter screen, and specifically may be that a temperature deviation between the current temperature of the filter screen and the target disinfection temperature is greater than or equal to a first threshold and less than or equal to a second threshold, where the second threshold is greater than the first threshold. The second threshold is a temperature threshold of a positive value, and can be customized according to the situation.
Specifically, the controller compares the temperature deviation between the current temperature of the filter screen and the target sterilization temperature with a first threshold value and a second threshold value respectively, determines that a temperature maintenance control condition is reached when the temperature deviation is greater than the first threshold value and less than the second threshold value, determines a first heating duty ratio based on the temperature deviation, and controls the heater to heat the filter screen according to the determined first heating duty ratio in a heating period so as to control the temperature of the filter screen.
In the above embodiment, when the temperature deviation between the current temperature of the filter screen and the target sterilization temperature is within the threshold range determined by the first threshold and the second threshold, it represents that the current temperature of the filter screen reaches the temperature capable of inactivating the target object to be sterilized and sterilized on the filter screen, and the first heating duty ratio is determined based on the temperature deviation between the current temperature of the filter screen and the target sterilization temperature, so that when the heater is controlled according to the first heating duty ratio to heat the filter screen for maintaining the temperature, the temperature of the filter screen can be maintained within the set sterilization temperature range, and the sterilization temperature range is determined based on the target sterilization temperature, the first threshold and the second threshold, so as to achieve continuous sterilization and disinfection, and thus the sterilization and disinfection effects are better.
In one embodiment, the method for controlling the temperature of the filter screen further includes: detecting the operation mode of the fan in the process of controlling the heater to heat the filter screen at the temperature maintaining state; upon detecting a switch in the operating mode to a manual mode, determining a second heating duty cycle based on the manual mode; and controlling the heater to heat the filter screen according to the second heating duty ratio in the heating period so as to control the temperature of the filter screen.
The running mode of the fan comprises an automatic mode and a manual mode. When the fan is in the automatic mode, the fan can be based on the dust value automatic adjustment fan rotational speed that detects. The manual mode comprises a high-speed mode, a medium-speed mode and a low-speed mode, and when the fan is in the high-speed mode, the medium-speed mode or the low-speed mode, the rotating speed of the fan is fixed and unchanged.
Specifically, the controller controls the heater to perform temperature maintenance heating on the filter screen according to the determined heating duty ratio (a first heating duty ratio or a second heating duty ratio), namely detects the operation mode of the fan in real time in a temperature maintenance control stage, determines a second heating duty ratio corresponding to a manual mode when the operation mode of the fan is detected to be switched to the manual mode, and controls the heater to heat the filter screen according to the second heating duty ratio in a heating period so as to maintain the temperature of the filter screen near a target disinfection temperature.
In one embodiment, the controller determines the second heating duty ratio based on a type of the manual mode switched to when it is detected that the operation mode of the fan is switched from the automatic mode to the manual mode, or determines the second heating duty ratio based on a rotational speed of the fan in the manual mode switched to. When the controller detects that the operation mode of the fan is switched from one type of manual mode to another type of manual mode, the controller determines the heating duty ratio corresponding to the another type of manual mode as the second heating duty ratio, for example, when the fan is detected to be switched from the high-speed mode to the medium-speed mode, the controller determines the heating duty ratio corresponding to the medium-speed mode as the second heating duty ratio.
In the above embodiment, when the operation mode of fan changes, the fan rotational speed also can change along with it, and the fan rotational speed can influence the radiating effect of fan to the filter screen when changing, also can accelerate or slow down the filter screen heat dissipation, therefore, when the operation mode of fan switches to the fixed manual mode of fan rotational speed, confirm the second heating duty cycle based on the manual mode, so that when carrying out temperature maintenance heating to the filter screen according to second heating duty cycle control heater, can be based on the duty cycle that the flexible control heater of fan rotational speed opened and closed, thereby can be better maintain the filter screen temperature in the threshold value scope, so that the effect of disinfecting is more excellent.
In one embodiment, the method for controlling the temperature of the filter screen further includes: when the operation mode is detected to be switched to the automatic mode and the temperature maintaining control condition is judged to be reached, determining a first heating duty ratio based on the temperature deviation between the current temperature of the filter screen and the target disinfection temperature; and controlling the heater to heat the filter screen according to the first heating duty ratio in a heating period so as to control the temperature of the filter screen.
Specifically, the controller controls the heater to perform temperature maintenance heating on the filter screen based on the determined heating duty ratio, detects the operation mode of the fan in real time, judges whether a temperature maintenance control condition is reached based on the current temperature of the filter screen and the target disinfection temperature when the operation mode of the fan is detected to be switched from the manual mode to the automatic mode, determines a first heating duty ratio based on the temperature deviation between the current temperature of the filter screen and the target disinfection temperature when the temperature maintenance control condition is reached, and controls the heater to perform temperature maintenance heating on the filter screen according to the determined first heating duty ratio in a heating period so as to maintain the temperature of the filter screen within a set disinfection temperature range, thereby realizing continuous sterilization and disinfection.
In the above-mentioned embodiment, because under the automatic mode, the fan rotational speed can be along with waiting to disinfect the dust value dynamic adjustment in the air of purification, from this, when the running mode of fan switches to the automatic mode, confirm first heating duty cycle based on the temperature difference between current temperature of filter screen and the target disinfection temperature, so that when carrying out the temperature maintenance heating to the filter screen based on first heating duty cycle control heater, can accurately maintain the temperature of filter screen in the disinfection temperature range of setting for, in order to realize lasting and effectual disinfection of disinfecting, thereby can improve the disinfection effect of disinfecting.
In one embodiment, the method for controlling the temperature of the filter screen further includes: and when the heating stop condition is reached, controlling the heater to stop heating the filter screen.
The heating stop condition is a condition or basis for judging whether to control the heater to stop heating the filter screen, and specifically may be that a temperature deviation between the current temperature of the filter screen and the target disinfection temperature is greater than a second threshold, or a fault signal is detected, or a filter screen is detected to be absent.
In one embodiment, when the heating stopping condition is determined to be reached, the heater is controlled to stop heating the filter screen, the fan is controlled to operate according to the current fan rotating speed to radiate heat to the filter screen, timing is started, and when the timing duration is longer than or equal to a preset duration or when the current temperature of the filter screen is detected to be smaller than or equal to a third threshold value, the fan is controlled to stop operating to stop radiating heat to the filter screen. The preset duration can be customized according to actual conditions. The third threshold may specifically be any value smaller than the first threshold.
In the above embodiment, when it is determined that the heating stop condition is reached, the heater is controlled to stop heating the filter net, so as to avoid damage to one or more components in the air sterilizer or inefficient operation, and to avoid a problem of energy waste caused by performing an unnecessary heating process.
In one embodiment, the heating stop condition includes: the temperature deviation between the current temperature of the filter screen and the target disinfection temperature is greater than a second threshold value, or a fault signal is detected, or the filter screen is detected to be missing.
The fault signal is used for representing that the air disinfection purifier breaks down in the operation process, the faults of the air disinfection purifier are various and include but are not limited to high-voltage faults, motor stalling faults, dust sensor faults, communication faults between a main board and a display panel and the like. The absence of the filter screen means that the filter screen in the air disinfection purifier is removed or that the filter screen is not present in the air disinfection purifier.
Specifically, the controller compares the temperature difference between the current temperature of the filter screen and the target disinfection temperature with a second threshold, and when the temperature difference is greater than the second threshold, the heating stop condition is determined to be reached, the heating stop condition at the moment can also be understood as a heat dissipation control condition, and then the heater is controlled to stop heating the filter screen, so that heat dissipation of the filter screen is realized. The controller detects the fault signal in real time in the whole temperature control process of the filter screen, and judges that the heating stop condition is reached when the fault signal is detected. The controller judges whether the filter screen is lost in real time in the whole filter screen temperature control process, and judges that the heating stop condition is reached when the filter screen is judged to be lost.
In one embodiment, the air disinfection purifier further comprises a pressure-sensitive sensor which is connected with the controller and is packaged in the shell, and the pressure-sensitive sensor is used for detecting whether the filter screen is missing or not and sending a filter screen missing signal to the controller when the filter screen is missing. And when the controller receives the filter screen missing signal, judging that the heating stop condition is reached.
In the above embodiment, when the current temperature of the filter screen is over-temperature, a fault signal is detected or the filter screen is absent, the heater is controlled to stop heating the filter screen, so that the effects of protecting each component of the air purifier and saving energy are achieved.
As shown in fig. 4, in one embodiment, there is provided a flow chart of a method for controlling a temperature of a filter screen of an air sterilizer, the method comprising the steps of: after the filter screen temperature control process is started, the initial temperature of the filter screen is obtained as the current temperature of the filter screen, when the difference value between the initial temperature and the target disinfection temperature is larger than a second threshold value, the heat dissipation control stage is judged to enter, when the difference value between the initial temperature and the target disinfection temperature is smaller than a first threshold value, the temperature rise control stage is judged to enter, and when the difference value between the initial temperature and the target disinfection temperature is larger than or equal to the first threshold value and smaller than or equal to the second threshold value, the temperature maintenance control stage is judged to enter. Further, in the heat dissipation control stage, the heating duty ratio is controlled based on the PID, the temperature is controlled based on feedback adjustment, the temperature of the filter screen is dynamically obtained and serves as the current temperature of the filter screen, and when the difference value between the temperature of the filter screen and the target disinfection temperature is larger than or equal to a first threshold value and smaller than or equal to a second threshold value, the temperature maintenance control stage is judged to be started. And in the temperature maintenance control stage, the heating duty ratio is controlled based on the PID, the operation mode of the fan is detected, when the operation mode of the fan is detected to be switched to the manual mode, the heating duty ratio is controlled based on the manual mode, when the operation mode of the fan is detected to be switched to the automatic mode, the heating duty ratio is controlled based on the PID, and when a shutdown instruction is detected, the heat dissipation control stage is judged to be entered. And in the heat dissipation control stage, the current temperature of the filter screen is obtained, when the difference value between the target disinfection temperature and the current temperature is greater than or equal to a first threshold value and less than or equal to a second threshold value, the temperature judging stage is returned to execute again, and when the heat dissipation is judged to be completed, auxiliary heat is closed.
It should be understood that although the steps in the flowcharts of fig. 3 and 4 are shown in sequence as indicated by the arrows, the steps are not necessarily performed in sequence as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 3 and 4 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of performing the steps or stages is not necessarily sequential, but may be performed alternately or alternately with other steps or at least some of the other steps or stages.
In one embodiment, a computer-readable storage medium is further provided, which stores a computer program, and when the computer program is executed by a processor, the computer program causes the processor to execute the steps of the method of each embodiment.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (12)
1. An air sterilizer purifier, comprising:
a housing, and enclosed within the housing:
filtering with a screen;
the temperature sensor is arranged on one side of the filter screen and used for collecting the temperature of the filter screen;
the fan enables air to be disinfected and purified to flow through the filter screen;
the heater is used for heating the filter screen; and a process for the preparation of a coating,
the controller is electrically connected with the temperature sensor, acquires the current temperature of the filter screen, determines a first heating duty ratio based on the temperature deviation between the current temperature of the filter screen and the target disinfection temperature when the temperature rise control condition is reached, and controls the heater to heat the filter screen according to the first heating duty ratio in a heating period so as to control the temperature of the filter screen; the temperature rise control conditions include: the temperature deviation between the current temperature of the filter screen and the target disinfection temperature is smaller than a first threshold value;
the controller determines a first heating duty ratio based on the temperature deviation between the current temperature of the filter screen and the target disinfection temperature when the temperature maintaining control condition is reached, and controls the heater to heat the filter screen according to the first heating duty ratio in a heating period so as to control the temperature of the filter screen; the temperature maintaining control conditions comprise: the temperature deviation between the current temperature of the filter screen and the target disinfection temperature is greater than or equal to a first threshold value and less than or equal to a second threshold value, and the second threshold value is greater than the first threshold value;
the controller is controlling the heater is right the filter screen carries out the in-process that the dimension temperature heated, detects the running mode of fan, detects when running mode switches to manual mode, based on manual mode confirms second heating duty cycle, control the heater is in the heating cycle according to second heating duty cycle is to the filter screen heats, in order to control the temperature of filter screen.
2. The air sanitizer according to claim 1, wherein the first threshold is a negative temperature threshold.
3. The air sanitizer according to claim 1, wherein the second threshold is a positive temperature threshold.
4. The air sterilizer of claim 1, wherein the controller determines a first heating duty ratio based on a temperature deviation between the current temperature of the filter screen and a target sterilization temperature upon detection of the switching of the operation mode to the automatic mode and determination of reaching a temperature maintenance control condition, and controls the heater to heat the filter screen at the first heating duty ratio during a heating cycle to control the temperature of the filter screen.
5. The air sterilizer of claim 1, wherein the controller controls the heater to stop heating the filter screen when a heating stop condition is reached.
6. The air sterilizer of claim 5, wherein the heating stop condition comprises: the temperature deviation between the current temperature of the filter screen and the target disinfection temperature is greater than a second threshold value, or a fault signal is detected, or the filter screen is detected to be missing.
7. A method for controlling the temperature of a filter screen of an air disinfection purifier, the method comprising:
acquiring the current temperature of a filter screen of the filter screen;
when a temperature rise control condition is reached, determining a first heating duty ratio based on a temperature deviation between the current temperature of the filter screen and a target disinfection temperature; the temperature rise control conditions include: the temperature deviation between the current temperature of the filter screen and the target disinfection temperature is smaller than a first threshold value;
controlling the heater to heat the filter screen according to the first heating duty ratio in a heating period so as to control the temperature of the filter screen;
the method further comprises the following steps:
when a temperature maintenance control condition is reached, determining a first heating duty ratio based on a temperature deviation between the current temperature of the filter screen and a target disinfection temperature; the temperature maintaining control conditions comprise: the temperature deviation between the current temperature of the filter screen and the target disinfection temperature is greater than or equal to a first threshold value and less than or equal to a second threshold value, and the second threshold value is greater than the first threshold value; controlling the heater to heat the filter screen according to the first heating duty ratio in a heating period so as to control the temperature of the filter screen;
detecting the operation mode of a fan in the process of controlling the heater to heat the filter screen at the temperature maintaining state; upon detecting a switch in the operating mode to a manual mode, determining a second heating duty cycle based on the manual mode; and controlling the heater to heat the filter screen according to the second heating duty ratio in the heating period so as to control the temperature of the filter screen.
8. The method of claim 7, wherein the first threshold is a negative temperature threshold.
9. The method of claim 7, wherein the second threshold is a positive temperature threshold.
10. The method of claim 7, further comprising:
when the operation mode is detected to be switched to the automatic mode and the temperature maintaining control condition is judged to be reached, determining a first heating duty ratio based on the temperature deviation between the current temperature of the filter screen and the target disinfection temperature;
and controlling the heater to heat the filter screen according to the first heating duty ratio in a heating period so as to control the temperature of the filter screen.
11. The method of claim 7, further comprising:
and when the heating stop condition is reached, controlling the heater to stop heating the filter screen.
12. The method of claim 11, wherein the heating stop condition comprises: the temperature deviation between the current temperature of the filter screen and the target disinfection temperature is greater than a second threshold value, or a fault signal is detected, or the filter screen is detected to be missing.
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