A method of defrosting a vehicle and apparatus therefor

Abstract

The application relates to a car defrosting method and device, which comprises the following steps: obtaining the light transmittance of a car glass and comparing the light transmittance with a first light transmittance threshold; when the light transmittance is lower than the first light transmittance threshold, starting a blowing device to perform defrosting and recording the starting time point of the blowing device; calculating the time interval between the starting time point and the last starting time point and comparing the time interval with a time interval threshold; when the time interval is lower than the time interval threshold, performing defrosting further comprises starting an air conditioner; when the time interval is higher than the time interval threshold, comparing the light transmittance with a second light transmittance threshold; when the light transmittance is higher than the second light transmittance threshold, stopping the blowing device to cancel defrosting, and the second light transmittance threshold is greater than the first light transmittance threshold. In the application, when the light transmittance of the car glass is lower than the first light transmittance threshold, the blowing device is started to perform defrosting, so that the purpose of automatic defrosting is achieved, and the driver is liberated; in the case that frosting is very fast, the air conditioner is also started to perform defrosting, so that long-acting defrosting is achieved, and the temperature in the cabin is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of automobile, in particular to a defrosting method and device for automobile. BACKGROUND

[0002] Traditional automobile defrosting refers to using automobile heater or engine cooling circulation system to heat cold air into hot air, and spraying the hot air to windshield through defrosting air duct and defrosting nozzle to increase the temperature of windshield and remove frost. In winter, especially in the north, a layer of frost is often formed on the front windshield of the automobile due to the low outdoor temperature. In order to make the automobile available as soon as possible, the existing automobile generally has a defrosting device communicating with the air duct of the automobile air conditioner at the front windshield to defrost the front windshield. The above device needs to be manually started by the driver after self-judgment, and in the case of large temperature difference between the inside and outside of the vehicle and fast frosting speed, the driver needs to operate frequently, which affects the driving safety and gives the passengers a poor cabin experience. SUMMARY

[0003] The present application provides a defrosting method and device for automobile, which can solve the problem that the driver needs to self-judge whether to defrost and manually start the defrosting device, and the driver needs to operate frequently in the case of fast frosting speed, which affects the driving safety.

[0004] In a first aspect, the present application provides a defrosting method for automobile, comprising:

[0005] obtaining the light transmittance of the windshield and comparing it with a first light transmittance threshold value;

[0006] when the light transmittance is lower than the first light transmittance threshold value, starting a blowing device to perform defrosting and recording the starting time point of the blowing device;

[0007] calculating the time interval between the starting time point and the last starting time point and comparing it with a time interval threshold value;

[0008] when the time interval is lower than the time interval threshold value, performing defrosting further comprises starting an air conditioner;

[0009] when the time interval is higher than the time interval threshold value, comparing the light transmittance with a second light transmittance threshold value;

[0010] when the light transmittance is higher than the second light transmittance threshold value, stopping the blowing device to cancel defrosting, and the second light transmittance threshold value is greater than the first light transmittance threshold value.

[0011] In combination with the first aspect, in an embodiment, the air conditioner is started for a preset time, and then the air conditioner and the blowing device are stopped to cancel defrosting.

[0012] In combination with the first aspect, in an embodiment, the air conditioner is started, specifically comprising:

[0013] acquiring a current outside temperature and a time interval;

[0014] obtaining, based on a pre-stored relationship table, an air conditioner air volume corresponding to the time interval at the outside temperature;

[0015] starting the air conditioner and controlling the air conditioner to operate at the air volume.

[0016] In combination with the first aspect, in an implementation, the air conditioner air volume corresponding to different time intervals is different at the same outside temperature.

[0017] In combination with the first aspect, in an implementation, the vehicle glass is one or several of a window glass, a front windshield and a rear windshield.

[0018] In combination with the first aspect, in an implementation, when the vehicle glass is several of a window glass, a front windshield and a rear windshield, the defrosting device is started to perform defrosting when the light transmittance of one of the vehicle glasses is lower than a first light transmittance threshold.

[0019] Or, when the vehicle glass is several of a window glass, a front windshield and a rear windshield, the defrosting device is started to perform defrosting when the light transmittance of all the vehicle glasses is lower than the first light transmittance threshold.

[0020] In combination with the first aspect, in an implementation, the first light transmittance threshold ranges from 0 to 80%.

[0021] In combination with the first aspect, in an implementation, the second light transmittance threshold ranges from 95% to 100%.

[0022] The second aspect provides an automobile defrosting device, which comprises a first module, a second module, a third module, a fourth module, a fifth module, a sixth module and a seventh module. The first module is configured to acquire a light transmittance of a vehicle glass. The second module is configured to compare the light transmittance of the vehicle glass with a first light transmittance threshold. The third module is configured to start a defrosting device to perform defrosting when the light transmittance is lower than the first light transmittance threshold, and record a starting time point of the defrosting device. The fourth module is configured to calculate a time interval between the starting time point and a last starting time point, and compare the time interval with a time interval threshold. The fifth module is configured to start an air conditioner to perform defrosting when the time interval is lower than the time interval threshold. The sixth module is configured to compare the light transmittance with a second light transmittance threshold when the time interval is higher than the time interval threshold. The seventh module is configured to close the defrosting device to cancel defrosting when the light transmittance is higher than the second light transmittance threshold, and the second light transmittance threshold is greater than the first light transmittance threshold.

[0023] With reference to the second aspect, in an implementation form of the first module, the first module comprises: a light transmittance detection device, a sensor response area and a controller, the light transmittance detection device is arranged on one side of the vehicle glass, the sensor response area is arranged on the other side of the vehicle glass and corresponds to the position of the light transmittance detection device, and the controller is connected with the light transmittance detection device and configured to collect the light transmittance of the vehicle glass.

[0024] The technical scheme provided by the embodiments of the present application has the following beneficial effects:

[0025] The embodiments of the present application provide an automobile defrosting method and device. When the light transmittance of the vehicle glass is lower than a first light transmittance threshold, the defrosting is started by using the blowing device to achieve the purpose of automatic defrosting, so as to free the driver. In the case of rapid frosting, the situation is often accompanied by low outdoor temperature, which will cause the time interval between the starting time point and the last starting time point to be lower than the time interval threshold. At this time, in addition to using the blowing device to defrost, the air conditioner is also started to defrost, and the effect of adjusting the temperature difference between the inside and outside of the vehicle is adjusted to achieve long-acting defrosting, improve the temperature in the cabin, and provide a better cabin experience for the driver and passengers. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0027] Fig. 1 The schematic diagram of the automobile defrosting device provided by the embodiments of the present application is shown in the figure.

[0028] Fig. 2 The logic diagram of the automobile defrosting method provided by the embodiments of the present application is shown in the figure.

[0029] Fig. 3 The flow chart of the automobile defrosting method provided by the embodiments of the present application is shown in the figure.

[0030] In the figure: 1, light transmittance detection device; 2, sensor response area. DETAILED DESCRIPTION

[0031] In order to make the person skilled in the art better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0032] Referring to Figs. 1 to 3 The embodiments of the present application provide a defrosting method and device for a vehicle, which can solve the problem of the driver needing to manually determine whether to defrost and manually start the defrosting device in the prior art, and the driver needing to frequently operate the defrosting device in the case of fast frosting, which affects driving safety.

[0033] In a first aspect, the embodiments of the present application provide a defrosting method for a vehicle, which comprises:

[0034] 101: obtaining the light transmittance of the vehicle glass and comparing the light transmittance with a first light transmittance threshold;

[0035] 102: when the light transmittance is lower than the first light transmittance threshold, starting a blowing device to perform defrosting, and recording a starting time point of the blowing device;

[0036] 103: calculating a time interval between the starting time point and a previous starting time point, and comparing the time interval with a time interval threshold;

[0037] 104: when the time interval is lower than the time interval threshold, the defrosting further comprises starting an air conditioner;

[0038] 105: when the time interval is higher than the time interval threshold, comparing the light transmittance with a second light transmittance threshold;

[0039] 106: when the light transmittance is higher than the second light transmittance threshold, stopping the blowing device to cancel the defrosting, and the second light transmittance threshold is greater than the first light transmittance threshold.

[0040] In the present application, when the light transmittance of the vehicle glass is lower than the first light transmittance threshold, the blowing device is started to perform defrosting, so as to achieve the purpose of automatic defrosting and liberate the driver. In the case of fast frosting, the case is often accompanied by a low temperature outside the vehicle, which can cause the time interval between the starting time point and the previous starting time point to be lower than the time interval threshold. At this time, in addition to using the blowing device to defrost, the air conditioner is also started to defrost, so as to adjust the effect of the temperature difference between the inside and outside of the vehicle, achieve long-acting defrosting, and improve the temperature in the cabin, so that the driver and passengers have a better cabin experience.

[0041] In this embodiment, the light transmittance of the vehicle glass is obtained by the light transmittance detection device 1, the sensor response area 2 and the controller. The light transmittance detection device 1 is arranged on one side of the vehicle glass, the sensor response area 2 is arranged on the other side of the vehicle glass and corresponds to the position of the light transmittance detection device 1, and the controller is connected with the light transmittance detection device 1 and used to collect the light transmittance of the vehicle glass. In this embodiment, the vehicle is likely to frost on the vehicle glass in the case of low temperature and large temperature difference between the inside and outside. Therefore, the sensor response area 2 is arranged on the outside of the vehicle glass, the light transmittance detection device arranged on the inside sends the detected light transmittance to the controller, and the controller controls the blowing device and the air conditioner to perform defrosting and defrosting removal.

[0042] It should be noted that after the blowing device is started for the first time to perform defrosting, only the steps of recording the starting time point of the blowing device and closing the blowing device to remove defrosting when the light transmittance of the vehicle glass is higher than the second light transmittance threshold value need to be performed. When the blowing device is started for the second time, the third time and so on to perform defrosting, since the blowing device has been started before, steps 103-106 also need to be performed, that is, the time interval between the current blowing device starting time point and the last starting time point needs to be calculated, and the time interval is compared with the time interval threshold value:

[0043] When the time interval is lower than the time interval threshold value, it is determined that the frost speed of the vehicle glass is too fast, and frequent starting of the blowing device for defrosting will reduce the service life of the parts and also have a negative impact on the driving experience. In this case, in addition to starting the blowing device for defrosting, the air conditioner also needs to be started, which can meet the requirement of long-time defrosting and also enable the driver and passengers to have a better cabin experience.

[0044] When the time interval is higher than the time interval threshold value, the light transmittance of the vehicle glass will gradually increase when the blowing device performs defrosting until it exceeds the first light transmittance threshold value. At this time, the light transmittance of the vehicle glass needs to be continuously obtained, and the light transmittance of the vehicle glass is compared with the second light transmittance threshold value, that is, when the light transmittance of the vehicle glass is lower than the second light transmittance threshold value, the blowing device needs to be continuously started, and when the light transmittance of the vehicle glass is higher than the second light transmittance threshold value, the blowing device is closed to remove defrosting. After defrosting removal, return to step 101 to continue to obtain the light transmittance of the vehicle glass.

[0045] In the embodiment, the second transmittance threshold is set to be greater than the first transmittance threshold. Further, the first transmittance threshold is set to have a value range of 0-80%, and the second transmittance threshold is set to have a value range of 95%-100%. Specifically, preferably, in the embodiment, the first transmittance threshold is set to be 80%, and the second transmittance threshold is set to be 95%. In other embodiments, the first transmittance threshold can also be set to be 70%, and the second transmittance threshold can also be set to be 90%. The specific settings are determined according to actual conditions. In the embodiment, when the transmittance of the vehicle glass is lower than 80%, the defrosting is started by starting the blowing device. When the time interval between the current starting time point of the blowing device and the last starting time point is higher than the time interval threshold, the transmittance is compared with the second transmittance threshold 95%. When the transmittance is higher than 95%, the blowing device is turned off to stop the defrosting.

[0046] On the basis of the above-mentioned embodiments, it is further explained in the embodiment that the vehicle glass is set to be one or several of the vehicle window glass, the front windshield and the rear windshield.

[0047] In some possible embodiments, the vehicle glass is the front windshield, and the blowing device is an air conditioning blowing device. When the transmittance of the front windshield is lower than the first transmittance threshold, the blowing port of the blowing device, i.e. the air conditioning blowing device, is turned on to perform the defrosting.

[0048] In other possible embodiments, the vehicle glass is several of the vehicle window glass, the front windshield and the rear windshield. In the embodiment, when the vehicle glass is several of the vehicle window glass, the front windshield and the rear windshield, it can be set that when the transmittance of one of the vehicle glasses is lower than the first transmittance threshold, the blowing device is started to perform the defrosting. That is, the transmittance of the vehicle window glass, the transmittance of the front windshield and the transmittance of the rear windshield are all compared with the first transmittance threshold, and when one of the transmittances is lower than the first transmittance threshold, the blowing device is started.

[0049] It can also be set that when the vehicle glass is several of the vehicle window glass, the front windshield and the rear windshield, when the transmittance of all the vehicle glasses is lower than the first transmittance threshold, the blowing device is started to perform the defrosting. That is, when the transmittance of the vehicle window glass, the transmittance of the front windshield and the transmittance of the rear windshield are all lower than the first transmittance threshold, the blowing device is started to perform the defrosting.

[0050] In the embodiment, the blowing device for defrosting the front windshield can be an air conditioning blowing device, and the blowing device for defrosting the vehicle window glass and the rear windshield can be a device capable of blowing warm air and separately arranged at the vehicle window glass and the rear windshield.

[0051] Wherein, the above embodiments are only a plurality of possible implementation manners of the embodiments of the application, and the embodiments of the application are not limited to this.

[0052] On the basis of the above embodiments, in the embodiment, the air conditioner and the blowing device are turned off after being started for a preset time to remove the defrosting.

[0053] Specifically, when the time interval threshold is lower, the defrosting is performed by starting the air conditioner and the blowing device, and in order to avoid the energy waste of the automobile, the air conditioner and the blowing device are stopped after being started for a preset time to remove the defrosting. In the embodiment, the preset time is set to 30 min, that is, the controller controls the air conditioner and the blowing device to stop running after the air conditioner and the blowing device are started for 30 min. After the air conditioner and the blowing device are stopped, the light transmittance of the vehicle glass still needs to be continuously acquired, and the operations of steps 101-106 are performed.

[0054] On the basis of the above embodiments, in the embodiment, in step 104 of starting the air conditioner, steps 1041-1043 are specifically included.

[0055] Step 1041: acquire the current outdoor temperature and the time interval;

[0056] Step 1042: based on the pre-stored relationship table, the air conditioner air volume corresponding to the time interval under the outdoor temperature is obtained;

[0057] Step 1043: start the air conditioner and control the air conditioner to run at the air volume.

[0058] Wherein, before step 101, the relationship table between the outdoor temperature, the time interval and the air conditioner air volume needs to be established. It needs to be noted that in the embodiment, the time interval threshold is set to 5 min. Further, in the embodiment, the air conditioner air volume corresponding to different time intervals is different when the outdoor temperature is the same.

[0059] Specifically: the relationship table between the outdoor temperature, the time interval and the air conditioner air volume is as follows:

[0060]

[0061]

[0062] The principle of the above parameter corresponding table is as follows: four temperature gradients are set: -30℃≤K<-10℃, -10℃≤K<5℃, -5℃≤K<15℃, and K≥15℃; it is obtained through CAE simulation analysis that, in the case of the four temperature gradients, when the number of people in the vehicle is 1, 2, 3, 4, and 5, due to the comprehensive influence of breathing of the people in the vehicle, external environment, and other factors, the time interval of frost formation of the vehicle glass is different, so that the different environments in each temperature gradient can be divided into five time interval gradients, and the longer the time interval is, the longer the frost formation time is, at this time, in order to achieve better defrosting and in-vehicle temperature experience effect, different air conditioning air volume controls can be started.

[0063] When the time interval between the blowing device starting time point and the last starting time point is lower than the time interval threshold value, the current outdoor temperature and the time interval need to be obtained, and then the controller obtains the air conditioning air volume corresponding to the time interval at the outdoor temperature according to the pre-stored relationship table, for example: when the outdoor temperature is 0℃, the air conditioning air volume corresponding to the time interval of 4min calculated in step 103 is 40%; when the outdoor temperature is 10℃, the air conditioning air volume corresponding to the time interval of 4min calculated in step 103 is 35%; and the like. Here, no longer be exemplified.

[0064] After the air conditioner is started for 30min, the air conditioner and the blowing device are turned off, the light transmittance of the vehicle glass is continuously obtained, and the operations of steps 101-106 are performed.

[0065] In summary, the application can achieve the purpose of automatic defrosting when the vehicle glass frosting is not very fast, that is, the time interval between the adjacent two blowing device starting times is higher than the time interval threshold value, so as to free the driver and let the driver focus on driving, and reduce the risk of the driver manually operating the defrosting device; in the case of fast frosting, that is, the time interval between the adjacent two blowing device starting times is lower than the time interval threshold value, which is often accompanied by low outdoor temperature, the air conditioner is started, and the indoor and outdoor temperature difference is adjusted to achieve long-acting defrosting and improve the temperature in the cabin, so that the driver and passengers have a better cabin experience.

[0066] In a second aspect, the embodiments of the present application provide an automobile defrosting device, which comprises a first module, a second module, a third module, a fourth module, a fifth module, a sixth module and a seventh module, the first module is configured to acquire the light transmittance of the vehicle glass; the second module is configured to compare the light transmittance of the vehicle glass with a first light transmittance threshold; the third module is configured to: when the light transmittance is lower than the first light transmittance threshold, start a blowing device to perform defrosting, and record a starting time point of the blowing device; the fourth module is configured to: calculate a time interval between the starting time point and a last starting time point, and compare the time interval with a time interval threshold; the fifth module is configured to: when the time interval is lower than the time interval threshold, start an air conditioner during defrosting; the sixth module is configured to: when the time interval is higher than the time interval threshold, compare the light transmittance with a second light transmittance threshold; and the seventh module is configured to: when the light transmittance is higher than the second light transmittance threshold, stop the blowing device to cancel defrosting, wherein the second light transmittance threshold is greater than the first light transmittance threshold.

[0067] In the present application, when the light transmittance of the vehicle glass is lower than the first light transmittance threshold, the blowing device is started to perform defrosting, so as to achieve the purpose of automatic defrosting, and to free the driver. In the case of rapid frosting, the situation is often accompanied by low outdoor temperature, which can cause the time interval between the starting time point and the last starting time point to be lower than the time interval threshold. At this time, in addition to using the blowing device to defrost, the air conditioner is also started to defrost, so as to adjust the effect of the temperature difference between the inside and outside of the vehicle, so as to achieve long-acting defrosting, improve the temperature in the cabin, and provide a better cabin experience for the driver and passengers.

[0068] In the present embodiment, the light transmittance of the vehicle glass is acquired by the light transmittance detection device 1, the sensor response area 2 and the controller. The light transmittance detection device 1 is arranged on one side of the vehicle glass; the sensor response area 2 is arranged on the other side of the vehicle glass and corresponds to the position of the light transmittance detection device 1; and the controller is connected with the light transmittance detection device 1 and is configured to acquire the light transmittance of the vehicle glass. In the present embodiment, the vehicle is prone to frost on the vehicle glass in the case of low temperature and large temperature difference between the inside and outside of the vehicle. Therefore, the sensor response area 2 is arranged on the outside of the vehicle glass, the light transmittance detection device arranged on the inside sends the detected light transmittance to the controller, and the controller controls the blowing device and the air conditioner to perform defrosting and cancel defrosting.

[0069] In the description of the present application, it should be noted that the terms "upper", "lower", and the like are used for indicating the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. Unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0070] It should be noted that in the present application, relational terms such as "first" and "second", and the like are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus including a series of elements includes not only those elements, but also other elements not explicitly listed, or other elements inherent in such a process, method, article or apparatus. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of other identical elements in the process, method, article or apparatus including the element.

[0071] The above is only a specific embodiment of the present application, which enables those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. A method for defrosting a car, characterized in that: It includes: Obtaining the light transmittance of the vehicle glass and comparing it with a first light transmittance threshold; When the light transmittance is lower than a first light transmittance threshold, starting the blowing device to perform defrosting, and recording the starting time of the blowing device; Calculating the time interval between the start time point and the last start time point, and comparing it with the time interval threshold; When the time interval threshold is lower than the threshold, performing defrost also includes starting the air conditioner; When the light transmittance is higher than the time interval threshold, the light transmittance of the vehicle glass is continuously acquired, and the light transmittance is compared with the second light transmittance threshold; When the light transmittance is higher than a second light transmittance threshold, the blowing device is turned off to stop defrosting, and the second light transmittance threshold is higher than the first light transmittance threshold.

2. The vehicle defrosting method according to claim 1, wherein: After starting the air conditioner for the preset time, turn off the air conditioner and the blower to stop defrosting.

3. The vehicle defrosting method according to claim 1, wherein: Start the air conditioner, including: Get the current outside temperature and time interval; Based on the pre-stored relationship table, the air-conditioning air volume corresponding to the time interval at the vehicle outside temperature is obtained; Start the air conditioner and control it to run at this air volume.

4. The vehicle defrosting method according to claim 3, wherein: When the outside temperature is the same, the air-conditioning air volume corresponding to different time intervals is different.

5. The vehicle defrosting method according to claim 1, wherein: The vehicle glass is one or more of a vehicle window glass, a front windshield and a rear windshield.

6. The vehicle defrosting method according to claim 5, wherein: When the vehicle glass is selected from among a vehicle window glass, a front windshield glass, and a rear windshield glass, when the transmittance of one of the vehicle glass is lower than a first transmittance threshold, the blowing device is activated to perform defrosting; Alternatively, when the vehicle glass is several of the vehicle window glass, the front windshield and the rear windshield, when the transmittance of all the vehicle glasses is lower than the first transmittance threshold, the blowing device is activated to perform defrosting.

7. The vehicle defrosting method according to claim 1, wherein: The first light transmittance threshold value ranges from 0 to 80%.

8. The vehicle defrosting method according to claim 7, wherein: The second transmittance threshold value ranges from 95% to 100%.

9. A car defrosting device, characterized in that: It includes: The first module is used to obtain the light transmittance of the vehicle glass; The second module is configured to compare the light transmittance of the vehicle glass with a first light transmittance threshold; A third module is configured to: activate a blower device to perform defrosting when the light transmittance is lower than a first light transmittance threshold, and record a start time of the blower device; A fourth module is configured to calculate a time interval between the startup time point and a previous startup time point, and compare the time interval with a time interval threshold; a fifth module, configured to: start the air conditioner when performing defrosting when the time interval is lower than a time interval threshold; a sixth module, configured to: when the time interval is greater than the time interval threshold, continuously obtain the light transmittance of the vehicle glass, and compare the light transmittance with a second light transmittance threshold; The seventh module is configured to: turn off the blowing device to stop defrosting when the light transmittance is higher than a second light transmittance threshold, wherein the second light transmittance threshold is higher than the first light transmittance threshold.

10. The automobile defrosting device according to claim 9, characterized in that: The first module includes: A light transmittance detection device (1), wherein the light transmittance detection device (1) is arranged on one side of the glass of a vehicle; A sensor response area (2), the sensor response area (2) being arranged on the other side of the vehicle glass and corresponding to the location where the light transmittance detection device (1) is arranged; A controller is connected to the light transmittance detection device (1) and is used to collect the light transmittance of the vehicle glass.

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