A method and device for detecting energy-saving defogging of bathroom mirrors

Abstract

The present invention relates to the field of defog detection technology, and in particular to an energy-saving defog detection method and device for bathroom mirrors, including detecting the sudden change of humidity and the change of temperature and dew in the bathroom within a continuous detection cycle; when the humidity suddenly changes to the humidity change, when the humidity change is positive and the humidity change is greater than a first humidity threshold; when it is detected that the temperature and dew change meets a first trigger condition, the defog is turned on, otherwise the defog is not turned on; or when the humidity suddenly changes to the average humidity slope, when the average humidity slope is positive and the average humidity slope is greater than a first slope threshold; when it is detected that the temperature and dew change meets a first trigger condition, the defog is turned on, otherwise the defog is not turned on. The present invention solves the problem of poor accuracy in setting a fixed threshold for automatic defog in the existing method, and energy waste caused by wrong start.

Description

Technical Field

[0001] The present invention relates to the technical field of defogging detection, and in particular to an energy-saving defogging detection method and device for a bathroom mirror. Background Art

[0002] The mirror fogs up because water vapor condenses on the cold mirror surface. As the temperature of the water vapor in the air is rapidly reduced, the speed of the water molecules slows down, causing condensation.

[0003] Bathroom mirrors are prone to fogging when there is a large temperature difference and humidity. A clear and bright bathroom mirror brings people a pleasant mood when they are dressing up, so fogging of the mirror will affect people's normal washing psychology; in addition, frequent fogging of the mirror will also affect the service life of the mirror.

[0004] Patent publication number CN 110455750A, a mirror defog method, a mirror defog device and a smart mirror, emit detection light to the mirror through a light emitter; determine the reflected light parameters of the reflected light based on the reflected light, the reflected light is the light reflected by the mirror to the light sensor; based on the reflected light parameters, judge whether there is mirror fog on the mirror; but this method requires a light emitter device, and the cost is relatively high.

[0005] Patent authorization number CN 219479723U, multifunctional mirror, triggers mirror defogger through switch. This method needs manual button triggering, and there is a delay in defogger time.

[0006] Patent publication number CN 105259811A, a mirror defog method and an automatic defog mirror based on gesture recognition technology, detects the mirror temperature through a temperature sensor and compares it with the temperature threshold to determine whether to turn on the defog function; another example is patent publication number CN116528404A, a mirror defog method, device, mirror and computer storage medium, detects the mirror temperature through a sensor and compares it with the dew point temperature; both methods set fixed thresholds, and there are poor control accuracy and wrong start-up, which will cause unnecessary waste of electricity; for example, in scenes such as the seaside and rainy weather, the humidity in the air is high, sometimes close to 100%. When the humidity is higher, the dew point temperature is closer to the ambient temperature. At this time, a fixed threshold is set for defog, and when no one is using the bathroom mirror, frequent wrong starts of defog are caused, resulting in waste of electricity. Summary of the invention

[0007] In view of the shortcomings of the existing methods, the present invention takes the detection of whether there is a sudden change in the humidity in the closed environment of the bathroom as a premise, and then determines whether to turn on the defogger based on the difference between the ambient temperature and the dew point temperature, thereby effectively reducing the problem of energy waste caused by wrong startup.

[0008] The technical solution adopted by the present invention is: a bathroom mirror energy-saving defogging detection method comprises the following steps:

[0009] During the continuous detection cycle, detect the sudden change of humidity and the change of temperature and dew in the bathroom;

[0010] The humidity suddenly changes to a humidity change amount. When the humidity change amount is positive and is greater than the first humidity threshold, it is detected that the temperature dew change amount meets the first trigger condition, and the defogger is turned on, otherwise the defogger is not turned on;

[0011] or

[0012] The humidity suddenly changes to the average humidity slope. When the average humidity slope is positive and the average humidity slope is greater than the first threshold of the slope, it is detected that the change in temperature and dew meets the first trigger condition, and the defogger is turned on, otherwise the defogger is not turned on.

[0013] As a preferred embodiment of the present invention, the formula of the average slope of humidity is:

[0014] ;

[0015] Among them, T 1 is the total detection cycle; K N is the average humidity slope at the Nth second; M is the humidity slope; f i / 2 is the humidity at the i / 2 second; f (i-1) / 2 is the humidity at the (i-1) / 2 second.

[0016] As a preferred embodiment of the present invention, the first trigger condition includes: 0≤ambient temperature T-dew point temperature T e <The first threshold value of warm dew T t1 Or the mirror temperature T a -Dew point temperature T e <The first threshold value of warm dew T t1 .

[0017] As a preferred embodiment of the present invention, it also includes: the humidity suddenly changes to a humidity change amount, when the humidity change amount is negative and the absolute value of the humidity change amount is greater than a second humidity threshold; it is detected that the temperature dew change amount does not meet the second trigger condition, and the defogger is turned off.

[0018] As a preferred embodiment of the present invention, it also includes: the humidity suddenly changes to the humidity average slope, when the humidity average slope is negative and the absolute value of the humidity average slope is greater than the second threshold of the slope; it is detected that the change in temperature and dew does not meet the second trigger condition, and the defogger is turned off.

[0019] As a preferred embodiment of the present invention, the second trigger condition includes: 0≤ambient temperature T-dew point temperature T e <The second threshold value of warm dew T t2Or the mirror temperature T a -Dew point temperature T e <The second threshold value of warm dew T t2 .

[0020] As a preferred embodiment of the present invention, a bathroom mirror energy-saving defogging detection device comprises: a defogging film, a controller, a temperature sensor and a humidity sensor; the defogging film, the temperature sensor and the humidity sensor are all electrically connected to the controller;

[0021] The temperature sensor is used to collect the temperature in the bathroom;

[0022] The humidity sensor is used to collect the humidity in the bathroom;

[0023] The defog film is used to heat and defog the mirror;

[0024] The controller is used to calculate the dew point temperature, to determine the humidity change in the bathroom, and to determine the difference between the ambient temperature in the bathroom and the dew point temperature, thereby controlling the operation of the defogger membrane.

[0025] Beneficial effects of the present invention:

[0026] 1. By detecting that the humidity suddenly changes to positive and the humidity change or the average humidity slope exceeds the threshold value as the premise for starting the defog function, it effectively reduces the frequent wrong start of the defog film when the humidity is high and no one is around, thus saving electricity;

[0027] 2. Set different trigger conditions. Set a large threshold for the humidity rising trigger condition, so that the defogger can be turned on in advance; set a small threshold for the humidity falling trigger condition, so that the defogger can be turned off as early as possible to save energy;

[0028] 3. Through the measured environmental data of the bathroom, the dew point temperature is fitted using a polynomial algorithm to make the detected dew point temperature more accurate;

[0029] 4. By detecting the ambient temperature compared to detecting the mirror temperature, installation, disassembly and maintenance are relatively easy. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a flow chart of the energy-saving and defogging detection method for bathroom mirrors of the present invention;

[0031] Figure 2 It is a rear view schematic diagram of the intelligent defogging detection device for bathroom mirrors of the present invention;

[0032] Among them, 1. Bathroom mirror frame; 2. Demisting film; 3. Power module; 4. Touch panel; 5. Controller; 6. Temperature sensor; 7. Humidity sensor. DETAILED DESCRIPTION

[0033] The present invention is further described below in conjunction with the accompanying drawings and embodiments. This figure is a simplified schematic diagram, which only illustrates the basic structure of the present invention in a schematic manner, and therefore it only shows the components related to the present invention.

[0034] The dew point temperature refers to the temperature of the air when it is cooled to saturation under the condition that the water vapor content and air pressure do not change; when the water vapor in the air has reached saturation, the ambient temperature is the same as the dew point temperature; when the water vapor has not reached saturation, the ambient temperature is higher than the dew point temperature; so the difference between the dew point and the ambient temperature can indicate the degree of saturation of the water vapor in the air; at a relative humidity of 100%, the ambient temperature is the dew point temperature; the lower the dew point temperature is than the ambient temperature, the less likely the mirror will fog up.

[0035] Different environments refer to different geographical locations, such as different latitudes in the south and north or different altitudes in the east and west. Due to different latitudes, when the dew point temperature is reached, the corresponding relationship between the temperature and the water vapor pressure value in the environment is not the same; or when the altitude is different, when the dew point temperature is reached, the corresponding relationship between the temperature and the water vapor pressure value in the environment is also different.

[0036] like Figure 1 As shown, a bathroom mirror energy-saving defogging detection method includes the following steps:

[0037] The dew point temperature can be measured by a dew point meter; it can also be obtained by nonlinear function fitting; the nonlinear fitting process includes:

[0038] The temperature values ​​and saturated water vapor pressure values ​​corresponding to humidity in different environments are collected, and the dew point temperatures corresponding to different humidity, temperature values ​​and saturated water vapor pressure values ​​are fitted using a nonlinear function.

[0039] Taking a city as an example, when the humidity is 100%, the water vapor pressure values ​​corresponding to different temperatures are collected, as shown in Table 1:

[0040] Table 1 100% humidity, different temperatures and water vapor pressure data

[0041] temperature Saturated vapor pressure temperature Saturated vapor pressure temperature Saturated vapor pressure 1.0℃ 4.93hPa 11.0℃ 9.84hPa 21.0℃ 18.65hPa 1.5℃ 5.1hPa 11.5℃ 10.18hPa 21.5℃ 19.11hPa 2.0℃ 5.29hPa 12.0℃ 10.52hPa 22.0℃ 19.83hPa 2.5℃ 5.47hPa 12.5℃ 10.84hPa 22.5℃ 20.55hPa 3.0℃ 5.69hPa 13.0℃ 11.23hPa 23.0℃ 21.07hPa 3.5℃ 5.85hPa 13.5℃ 11.61hPa 23.5℃ 21.65hPa 4.0℃ 6.1hPa 14.0℃ 11.99hPa 24.0℃ 22.38hPa 4.5℃ 6.32hPa 14.5℃ 12.39hPa 24.5℃ 23.15hPa 5.0℃ 6.54hPa 15.0℃ 12.79hPa 25.0℃ 23.76hPa 5.5℃ 6.78hPa 15.5℃ 12.21hPa 25.5℃ 24.45hPa 6.0℃ 7.01hPa 16.0℃ 13.6hPa 26.0℃ 25.21hPa 6.5℃ 7.23hPa 16.5℃ 13.08hPa 26.5℃ 25.65hPa 7.0℃ 7.51hPa 17.0℃ 14.53hPa 27.0℃ 26.74hPa 7.5℃ 7.77hPa 17.5℃ 15.01hPa 27.5℃ 27.55hPa 8.0℃ 8.05hPa 18.0℃ 15.48hPa 28.0℃ 28.35hPa 8.5℃ 8.23hPa 18.5℃ 16.06hPa 28.5℃ 29.16hPa 9.0℃ 8.61hPa 19.0℃ 16.48hPa 29.0℃ 30.04hPa 9.5℃ 8.9hPa 19.5℃ 16.99hPa 29.5℃ 31.65hPa 10.0℃ 9.21hPa 20.0℃ 17.54hPa 30.0℃ 31.82hPa 10.5℃ 9.5hPa 20.5℃ 18.14hPa 30.5℃ 37.65hPa

[0042] It should be noted that only the water vapor pressure values ​​corresponding to different temperatures when the humidity is 100% are given here. The same collection method is used for other humidity conditions.

[0043] Among them, the temperature can be collected by the temperature sensor 6, and can also be collected by the temperature and humidity integrated sensor; the humidity value can be collected by the humidity sensor 7, and can also be obtained by the temperature and humidity integrated sensor; the water vapor pressure value can be measured by instruments such as mercury barometer, air box barometer, metal box barometer, vibrating cylinder pressure sensor, etc.

[0044] The water vapor pressure value P at different humidity and temperature is obtained by using nonlinear function fitting;

[0045] The nonlinear function can be an exponential function, and the formula is:

[0046] P = E * f = a * d^((b * t / (c + t)) * f

[0047] Among them, E is the saturated water vapor pressure value; t is temperature, f is humidity, a, b, c are correction coefficients; d is the base; taking the data in Table 1 as an example, the fitting results are a=5.11, b=7.5, c=237.3; d=10; when the data in Table 1 are different, the corresponding parameters a, b, c, d values ​​are also different.

[0048] Solve the above formula in reverse to get the dew point temperature T e , the formula is:

[0049] T e = ((c * log d (P / a))) / ((b - log d (P / a)))

[0050] During the continuous detection cycle, detect the sudden change of humidity in the bathroom and the change of temperature and dew in the bathroom;

[0051] The humidity suddenly changes to a humidity change amount. When the humidity change amount is positive and is greater than the first humidity threshold, it is detected that the temperature dew change amount meets the first trigger condition, and the defogger is turned on, otherwise the defogger is not turned on;

[0052] or

[0053] The humidity suddenly changes to the average humidity slope. When the average humidity slope is positive and the average humidity slope is greater than the first threshold of the slope, the change in temperature and dew meets the first trigger condition, and the defogger is turned on, otherwise the defogger is not turned on.

[0054] Detection cycle t i Custom settings, for example, the detection period is set to 1s, and i is a certain moment;

[0055] Set the detection period t i The humidity in the bathroom is f i , detection period t i+1 The humidity is f i+1 , humidity change △f i+1 =f i+1 -f i ;

[0056] The change in temperature and dew point is the difference between the ambient temperature and the dew point temperature, that is, the ambient temperature T-dew point temperature T eOr the temperature and dew change is the difference between the mirror temperature and the dew point temperature in CN116528404A, that is, the mirror temperature T a -Dew point temperature T e .

[0057] When the humidity change is positive, that is, △f i+1 >0, indicating that the humidity at time i+1 is greater than the humidity at time i, that is, the humidity has an upward trend; and △f i+1 Greater than the first humidity threshold T s1 In this embodiment, T s1 Set to 3%, that is, the humidity increases by 3% within 1 second, T s1 Custom settings; that is, the humidity change is the prerequisite for turning on the defogger. When the prerequisite is met, the temperature and dew change is determined.

[0058] Table 2 Test data in an experimental environment

[0059] time 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 Ambient temperature 26.1 26.2 26.2 26.1 26.3 26.4 26.5 26.5 26.6 26.7 26.7 26.6 26.7 humidity 75 75 76 78 80 81 83 85 88 93 97 99 99 Humidity change 1 4 3 5 9 2 Dew point temperature 21.1 21.2 21.4 21.7 22.3 22.6 23.1 23.5 24.2 25.3 26.1 26.4 26.5 Ambient temperature - dew point temperature 5 5 4.8 4.4 4 3.8 3.4 3 2.4 1.4 0.6 0.2 0.2

[0060] In Table 2, time 0 seconds is the initial environment of the bathroom, the tap water temperature is set to 41°C, the initial ambient temperature is 26.1°C, and the initial humidity is 75%. Since there may be certain errors in humidity detection, the increase in humidity after water outlet is not obvious, and the increase in humidity gradually increases with time; but the increase in ambient temperature is not obvious. It can be seen from Table 2 that the humidity changes increase by 1%, 4%, 3%, 5%, 9%, and 2% from 1 to 6 seconds, respectively, that is, with the increase in time, the humidity change increases significantly in the 2 to 5 second stage until it approaches the saturated humidity of 100%.

[0061] As a preferred embodiment of the present invention, since there may be errors in the humidity change within a 1-second detection period, resulting in inaccurate detection, the humidity average slope K can also be used. N To judge the humidity mutation, K N The formula is:

[0062] ;

[0063] Among them, T 1 is the total detection cycle; K N is the average slope of humidity at the Nth second; f i / 2 is the humidity at the i / 2 second, and M is the humidity slope.

[0064] Table 3 Changes in average slope of humidity under certain experimental environment

[0065] time 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 humidity 75 75 76 78 80 81 83 85 88 93 97 99 99 Humidity slope / 0 2 4 4 2 4 4 6 10 8 2 2 Humidity average slope 1 / 3 5 / 3 8 / 3 13 / 3 22 / 3 24 / 3

[0066] As shown in Table 3, in this embodiment, T 1=6s, when the average humidity slope is positive, that is, K N >0, indicating that the average slope of humidity at the Nth moment has an upward trend; and K N Greater than the first slope threshold T k1 In this embodiment, T k1 Set to 1.5; as shown in Table 3, the average humidity slope at the second second is 5 / 3>1.5, that is, the average humidity slope is used as a prerequisite for turning on defogger. When the prerequisite is met, the change in temperature and dew is determined.

[0067] As a preferred embodiment of the present invention, the first trigger condition includes: 0≤ambient temperature T-dew point temperature T e <The first threshold value of warm dew T t1 ; or use the mirror temperature T in CN116528404A a -Dew point temperature T e <The first threshold value of warm dew T t1 ;

[0068] In this embodiment, T t1 Set to 6°C, T t1 Custom settings, you can set T according to the initial humidity of the bathroom t1 , when the initial humidity is low, T t1 Set it slightly larger. When the initial humidity is high, t1 Set it slightly smaller so that you can start defog earlier.

[0069] In a humid environment, such as a rainy day or at the seaside, the humidity in the air will increase over time, but this upward trend is usually measured in minutes or hours. In a relatively closed bathroom, the change in this upward trend within 1 second is negligible, that is, the humidity change within 1 second is close to 0 or the average humidity slope is close to 0; if only the first trigger condition is used to determine whether to turn on the defogger, due to weather and humidity, when the difference between the ambient temperature and the dew point temperature reaches T when no one is using the bathroom, the bathroom will be turned off. t1 When the demisting film 2 is turned on, it is frequently misactivated, resulting in a waste of electric energy.

[0070] The present invention uses the humidity sensor 7 to detect whether the humidity at the water outlet above the faucet has a sudden change to positive and exceeds a threshold value, and then makes a judgment on the first trigger condition, thereby avoiding wrong start-up when only the first trigger condition is used for judgment, and can effectively save energy; in addition, the use of ambient temperature is less difficult than the mirror temperature detection. When detecting the ambient temperature, the temperature sensor 6 does not need to be installed on the back of the mirror, and installation, disassembly and maintenance are relatively easy.

[0071] After the defog function is turned on, the humidity in the bathroom changes relatively slowly due to the continuous release of hot water from the faucet. At this time, the detection of a sudden change in humidity to positive and the threshold are no longer required as a prerequisite. The defog function can be turned on or off depending on whether the first trigger condition is met.

[0072] As a preferred embodiment of the present invention, after washing is finished and the faucet is turned off, the humidity in the bathroom will tend to decrease; in addition, when the bathroom door is opened, the humidity in the bathroom will drop suddenly. The drop in humidity can be used as a prerequisite for turning off the defogger, that is, as a prerequisite for finishing washing.

[0073] Also includes:

[0074] The humidity suddenly changes to a humidity change amount. When the humidity change amount is negative and the absolute value of the humidity change amount is greater than the second humidity threshold, it is detected that the temperature dew change amount does not meet the second trigger condition, and the defogger is turned off;

[0075] The humidity change is negative, that is, △f i+1 <0; when the hot water tap is turned off or the bathroom door is opened, the humidity change has a downward trend. In this embodiment, the second humidity threshold T s2 Set to 0.2%, T s2 You can customize the settings; for example, the humidity drops from 99% to 98.7% within 1 second, that is, it drops by 0.3% within 1 second, that is, -0.3%, |-0.3%|>0.2%, that is, the humidity change is the prerequisite for closing the defogger. When the prerequisite is met, the temperature and dew change is judged; the humidity change is detected as negative to avoid when the temperature and dew change is between T t1 With T t2 For example, T t1 Set to 6℃, when the humidity change is detected to be positive and the temperature change is 4℃, turn on the defogger; if the humidity change is negative, set T t2 If the setting is 2℃, the defogger will be turned off, but in fact the humidity may still be rising, and the defogger function should not be turned off at this time. Therefore, this false action can be avoided by setting the premise that the humidity change is negative.

[0076] As a preferred embodiment of the present invention, it also includes:

[0077] The humidity suddenly changes to the average humidity slope. When the average humidity slope is negative and the absolute value of the average humidity slope is greater than the second threshold of the slope, the change in temperature and dew does not meet the second trigger condition, and the defogger is turned off.

[0078] When the humidity average slope is negative, that is, K N <0, indicating that the average slope of humidity at the Nth moment has a downward trend; and K N Greater than the second slope threshold T k2 In this embodiment, the second slope threshold Tk2 Custom setting, that is, the average humidity slope is the prerequisite for turning off the defogger. When the prerequisite is met, the change in temperature and dew is determined.

[0079] As a preferred embodiment of the present invention, the second trigger condition includes: 0≤ambient temperature T-dew point temperature T e <The second threshold value of warm dew T t2 ; or use the mirror temperature T in CN116528404A a -Dew point temperature T e <The second threshold value of warm dew T t2 .

[0080] In this embodiment, T t2 Set to 2°C, T t2 Custom settings; usually T t2 Set to less than T t1 , when the humidity change is negative, set a smaller T t2 The defogger can be turned off as soon as possible, which has an energy-saving effect. For example, if the humidity drops by 0.3% within 1 second, the prerequisite for turning off the defogger is met. The ambient temperature T and the dew point temperature T e The difference is -3℃, |-3|>2, and the second trigger condition is not met, so the defogger is turned off.

[0081] like Figure 2 The energy-saving defogging detection device for bathroom mirrors includes: a defogging film 2, a controller 5, a temperature sensor 6 and a humidity sensor 7; the defogging film 2, the temperature sensor 6 and the humidity sensor 7 are all electrically connected to the controller 5; the connection method can be wired connection, or it can be connected through a Bluetooth module, a Wifi module, or a mobile network model; wherein,

[0082] The temperature sensor 6 is used to collect the temperature in the bathroom;

[0083] The humidity sensor 7 is used to collect the humidity in the bathroom;

[0084] The defogging film 2 is arranged on the back of the mirror and is used to heat the mirror for defogging;

[0085] The temperature sensor 6 and the humidity sensor 7 are arranged at the bottom of the bathroom mirror frame 1. This is because the hot water vapor rises from the bottom to the top when washing. The temperature sensor 6 and the humidity sensor 7 are arranged at the bottom to quickly detect the temperature and humidity changes at the bottom of the bathroom mirror.

[0086] The controller 5 is used to calculate the dew point temperature and control the operation of the demisting film 2 according to the changes in temperature and humidity.

[0087] It also includes: a power supply module 3 for supplying power to the controller 5 , the temperature sensor 6 and the humidity sensor 7 .

[0088] It also includes: a touch panel 4, which is used to manually set whether to perform the defog function, and to turn on and off the LED lights around the bathroom mirror.

[0089] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A bathroom mirror energy-saving defogging detection method, characterized in that: The following steps are involved: During the continuous detection cycle, detect the sudden change of humidity and the change of temperature and dew in the bathroom; The humidity suddenly changes to a humidity change amount. When the humidity change amount is positive and is greater than the first humidity threshold, it is detected that the temperature dew change amount meets the first trigger condition, and the defogger is turned on, otherwise the defogger is not turned on; or The humidity suddenly changes to the average humidity slope. When the average humidity slope is positive and the average humidity slope is greater than the first slope threshold, it is detected that the change in temperature and dew meets the first trigger condition, and the defogger is turned on, otherwise the defogger is not turned on; After turning on defog, the detection of humidity sudden change to positive and the threshold are no longer required as prerequisites; The formula for the humidity average slope is: ； Where T1 is the total detection period; M is the humidity slope; K N is the average slope of humidity at the Nth second; f i / 2 is the humidity at the i / 2 second; f (i-1) / 2 is the humidity at (i-1) / 2 seconds; The first trigger condition includes: 0≤ambient temperature T-dew point temperature T e <The first threshold value of warm dew T t1 Or the mirror temperature T a -Dew point temperature T e <The first threshold value of warm dew T t1 .

2. The bathroom mirror energy-saving defogging detection method according to claim 1 is characterized in that: Also includes: The humidity suddenly changes to the humidity change. When the humidity change is negative and the absolute value of the humidity change is greater than the second humidity threshold, it is detected that the temperature dew change does not meet the second trigger condition and the defogger is turned off.

3. The energy-saving and defogging detection method for bathroom mirrors according to claim 1 is characterized in that: Also includes: The humidity suddenly changes to the average humidity slope. When the average humidity slope is negative and the absolute value of the average humidity slope is greater than the second threshold of the slope, it is detected that the change in temperature and dew does not meet the second trigger condition, and the defogger is turned off.

4. The energy-saving and defogging detection method for bathroom mirrors according to claim 2 or 3, characterized in that: The second trigger condition includes: 0≤ambient temperature T-dew point temperature T e <The second threshold value of warm dew T t2 Or the mirror temperature T a -Dew point temperature T e <The second threshold value of warm dew T t2 .

5. A device using the bathroom mirror energy-saving defogging detection method according to any one of claims 1 to 4, characterized in that: include: A demisting film, a controller, a temperature sensor and a humidity sensor; the demisting film, the temperature sensor and the humidity sensor are all electrically connected to the controller; The temperature sensor is used to collect the temperature in the bathroom; The humidity sensor is used to collect the humidity in the bathroom; The defog film is used to heat and defog the mirror; The controller is used to calculate the dew point temperature; the controller is used to calculate the dew point temperature, which is used to judge the humidity change in the bathroom, and the difference between the ambient temperature in the bathroom and the dew point temperature, so as to control the operation of the demisting film.

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