Self-checking rearview mirror air curtain rainproof defogging device

Abstract

The utility model relates to a self-checking type rear -view mirror air curtain rainproof defogging device belongs to vehicle engineering and automobile safety technical field. Including casing assembly and reflector, still including detection sensor module, gas source module, air curtain nozzle module, control module and manual switch, casing assembly includes outer casing, inner casing and frame, the clearance between outer casing and inner casing is separated and forms upper chamber and lower chamber through partition, detection sensor module is fixed with inner casing and is connected with outside, gas source module includes micro -pump, electromagnetic valve, air blower and gas path, air curtain nozzle module includes long slit nozzle and micro -type rudder, micro -type rudder is switched the working posture of long slit nozzle through angle adjustment, long slit nozzle is fixed with the upper edge of frame in the top of reflector and is connected with micro -pump through air pipe. Advantages: have automatic rainy day rainproof and manual defogging dewdrop's dual working mode, give consideration to low noise, low energy consumption.

Description

Technical Field

[0001] This invention belongs to the field of vehicle engineering and automotive safety technology, and specifically relates to a self-testing rearview mirror air curtain rainproof and defogging device. Background Technology

[0002] Car side mirrors are key components for ensuring safe lane changes and turns, and their clarity directly affects the driver's field of vision and driving safety. In rainy, foggy, or environments with large temperature differences, rainwater, mist, and fine water droplets easily adhere to the mirror surface, seriously affecting the driver's side and rear visibility, thereby increasing the driving risks when changing lanes or turning.

[0003] One common solution is to coat the rearview mirror surface with a hydrophobic coating, utilizing the material's low surface energy to allow water droplets to slide off quickly. However, this type of coating has poor durability, cannot consistently maintain a clean mirror surface, and has limited ability to remove existing water mist or small water droplets. Another solution is to install an electrically heated film inside the rearview mirror, heating the mirror surface to promote water mist evaporation. This method is somewhat effective at removing fog, but it has low efficiency and slow response when removing larger raindrops, and consumes a lot of power, resulting in significant energy consumption for the vehicle over long periods. In addition, some high-end models use air vents in the rearview mirror housing to introduce air from the entire vehicle, using airflow to disperse rainwater on the mirror surface. However, this structure relies on the vehicle's central air source, making modification difficult and costly, and the airflow direction is fixed, making it impossible to flexibly adjust the angle and wind speed according to rainfall or user needs.

[0004] In summary, there is an urgent need to develop an integrated device that is compact, energy-efficient, and combines automatic rain protection with manual defogging functions without affecting the original performance of the rearview mirror. To this end, the applicant has made a useful design, and the technical solution to be introduced below is the result of this design. Summary of the Invention

[0005] The purpose of this invention is to provide a self-checking rearview mirror air curtain rainproof and defogging device, overcoming the shortcomings of existing technologies such as single function, high energy consumption, poor structural integration, and poor cleaning effect.

[0006] The objective of this invention is achieved by providing a self-checking rearview mirror air curtain rainproof and defogging device, comprising a housing assembly and a rearview mirror disposed on the front side of the housing assembly. The device further includes a detection sensor module, an air source module, an air curtain nozzle module, a control module, and a manual switch. The housing assembly comprises an outer housing connected to the vehicle body, an inner housing housed within the outer housing, and a frame connecting to the opening edges of both the outer and inner housings to seal the gap between them. The gap between the outer and inner housings is separated by a partition, forming an upper cavity and a lower cavity. The detection sensor module is fixed to the inner housing and connected to the outside environment. The air source module is located inside the inner shell and includes a miniature air pump, a solenoid valve connected to the miniature air pump, an air passage connected to the outside and controlled by the solenoid valve, and a blower that supplies air in conjunction with the miniature air pump. The air curtain nozzle module includes a long slit nozzle and a miniature servo motor. The miniature servo motor switches the working posture of the long slit nozzle by adjusting the angle. The miniature servo motor is installed in the upper cavity. The long slit nozzle is fixed above the reflector and the upper edge of the frame and is connected to the miniature air pump through an air pipe. The control module is electrically connected to the detection sensor module, the miniature air pump, the solenoid valve, the blower, the miniature servo motor, and the manual switch.

[0007] In a specific embodiment of the present invention, the control module is configured with an automatic mode and a manual mode. In the automatic mode, the control module automatically controls the micro air pump, solenoid valve, blower, and micro servo motor according to the ambient humidity detected by the detection sensor module, so that the micro air pump works at full load with rated voltage, and outputs a high-flow air curtain in conjunction with the blower. The micro servo motor adjusts the angle of the long slit nozzle, first blowing away water in an attitude parallel to the reflector, and then rotating to a preset tilt angle to form a rainproof air curtain on the reflector. In the manual mode, the control module is triggered by a manual switch to control the micro air pump, solenoid valve, and blower, so that the micro air pump works at low voltage, outputs a gentle air curtain in conjunction with the blower, and the micro servo motor adjusts the angle of the long slit nozzle to blow away water and mist in an attitude parallel to the reflector.

[0008] In another specific embodiment of the present invention, a reflector adjustment mechanism is further included. The reflector adjustment mechanism has a central ball head on one side facing the reflector, and adjustment ball heads are provided on both sides above the central ball head. The central ball head serves as the rotation fulcrum of the reflector. The adjustment ball heads are supported by a push rod. By extending and retracting the push rod, one adjustment ball head is used to control the horizontal tilt of the reflector, and the other adjustment ball head is used to control the vertical tilt of the reflector.

[0009] In another specific embodiment of the present invention, the reflector adjustment mechanism has fixing ears on both sides, and the fixing ears are fixed to the inner wall of the inner housing by fixing rods; the fixing rods are provided with spring retaining rings, which are located on the outside of the fixing ears and cooperate with the annular step on the fixing rods to fix and limit the fixing ears.

[0010] In another specific embodiment of the present invention, the micro servo is mounted on a servo mount, and a swing arm and a fixed shaft extend from the servo mount. The swing arm is hinged to the hinge joint of the long slit nozzle, and the fixed shaft is fixed to the side wall of the outer casing.

[0011] In another specific embodiment of the present invention, the long slit nozzle is provided with a hinge shaft along its length, and the two ends of the hinge shaft are hinged to the side walls on both sides of the outer casing at the opening of the outer casing. The frame is formed with a folded edge at the position corresponding to the top of the reflector. A slot is provided on the folded edge along its length, and the bottom of the long slit nozzle is rotatably disposed in the slot. An air inlet connector is provided on one side of the long slit nozzle, and the air inlet connector is connected to the micro air pump through an air pipe.

[0012] In a further specific embodiment of the present invention, the outer shell has a detection air inlet at the bottom, the detection sensing module is fixed to the inner shell in the lower cavity and its position corresponds to the detection air inlet, and the frame has a detection air outlet at the position corresponding to the lower edge of the reflector. The detection sensing module is a capacitive humidity sensor used to detect ambient humidity.

[0013] In a more specific embodiment of the present invention, a rigid dustproof and breathable membrane is installed on both the air inlet and outlet of the detection air path.

[0014] In yet another specific embodiment of the present invention, the air source module further includes a micro filter, the solenoid valve is a two-position normally closed solenoid valve, one end of the solenoid valve is connected to the air path, and the micro filter is connected in series between the solenoid valve and the micro air pump.

[0015] In yet another specific embodiment of the present invention, the blower is disposed on the inner top wall of the inner housing and supplies air to the center of the nozzle through a flexible air guide connector. The blower operates at full load with rated voltage in automatic mode and operates in manual mode using reduced voltage or intermittent power supply.

[0016] Compared with existing technologies, this invention, due to its aforementioned structure, offers the following advantages: it features dual operating modes—automatic rain protection and manual defogging and water droplet removal—while maintaining low noise and low energy consumption; it ensures long-term accuracy in detecting ambient humidity; and it significantly enhances airflow and water removal / rain protection by utilizing a combination of vehicle-driven airflow and a micro-pump for combined air intake; a micro-servo precisely adjusts the posture of the long-slit nozzle to adapt to different angle requirements for water removal and rain protection; the narrow-slit nozzle produces a flat, uniform, high-speed jet that fully covers the rearview mirror surface; the double-layered shell separates the upper and lower independent cavities, allowing for a rational layout of modules, reducing internal space occupation, and not interfering with the original rotation and adjustment functions of the rearview mirror; the overall structure is compact and highly integrated, allowing for direct compatibility with original vehicle rearview mirrors. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the assembly completed according to the present invention; Figure 3 This is a schematic diagram of the air curtain nozzle module described in this invention; Figure 4 This is a circuit block diagram of the present invention.

[0018] In the diagram: 1. Housing assembly; 11. Outer shell; 111. Detection air inlet; 12. Inner shell; 13. Frame; 131. Folded edge; 1311. Slot; 132. Detection air outlet; 14. Partition plate; 15. Upper cavity; 16. Lower cavity; 2. Detection sensor module; 3. Air source module; 31. Miniature air pump; 32. Solenoid valve; 33. Air path; 34. Miniature filter; 35. Mounting base; 3 6. Blower; 4. Air curtain nozzle module; 41. Long slit nozzle; 411. Hinge joint; 412. Hinge shaft; 42. Miniature servo; 421. Servo mount; 422. Swing arm; 423. Fixed shaft; 5. Rearview mirror adjustment mechanism; 51. Center ball joint; 52. Adjustment ball joint; 521. Push rod; 53. Fixed lug; 54. Fixed rod; 541. Spring retaining ring; 6. Rearview mirror; 7. Rearview mirror bracket. Detailed Implementation

[0019] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the description of the embodiments is not a limitation on the technical solution. Any formal but not substantive changes made based on the concept of the present invention should be considered within the scope of protection of the present invention.

[0020] In the following description, all directional (or orientational) concepts involving up, down, left, right, front, and back refer to the position of the figure being described, and are intended to facilitate public understanding. Therefore, they should not be construed as a special limitation on the technical solution provided by this invention.

[0021] See Figure 1 and Figure 2 This invention relates to a self-checking rearview mirror air curtain rainproof and defogging device, which is an intelligent self-checking air curtain device integrated into the car rearview mirror. Its core purpose is to automatically form a high-pressure air curtain to deflect rainwater in rainy weather, while also supporting manual triggering of low-pressure airflow to achieve defogging and removal of small water droplets.

[0022] The device includes a housing assembly 1 and a reflector 6 disposed on the front side of the housing assembly 1, as well as a detection sensor module 2, an air source module 3, an air curtain nozzle module 4, a control module, and a manual switch. The housing assembly 1 includes an outer housing 11 connected to the vehicle body, an inner housing 12 housed within the outer housing 11, and a frame 13 connected to the opening edges of the outer housing 11 and the inner housing 12 to seal the gap between them. The reflector 6 is disposed on the front side of the frame 13. The gap between the outer housing 11 and the inner housing 12 is separated by a partition 14, forming an independent upper cavity 15 and a lower cavity 16. The detection sensor module 2 is fixed to the inner housing 12 and connected to the outside. The air source module 3 is disposed within the inner housing 12 and includes a miniature air pump 31, a solenoid valve 32 connected to the miniature air pump 31, an air passage 33 connected to the outside and controlled by the solenoid valve 32, and a blower 36 that supplies air in conjunction with the miniature air pump 31. The air curtain nozzle module 4 includes a long slit nozzle 41 and a micro servo motor 42. The micro servo motor 42 switches the working posture of the long slit nozzle 41 by adjusting the angle. The micro servo motor 42 is installed in the upper cavity 15. The long slit nozzle 41 is fixed above the reflector 6 and the upper edge of the frame 13 and is connected to the micro air pump 31 through an air pipe. The housing assembly 1 adopts a double-layer housing design. This structure can reduce the occupation of the internal main cavity by the detection sensor module 2 and the air source module 3, and ensure that the reflector 6 can be adjusted normally. When installing the reflector 6, it is preferable to reserve a rotation space of ±15° vertically and ±15° horizontally.

[0023] See Figure 4The control module is electrically connected to the detection sensor module 2, the micro air pump 31, the solenoid valve 32, the blower 36, the micro servo motor 42, and the manual switch. The control module is configured with automatic and manual modes. In automatic mode, the control module automatically controls the micro air pump 31, the solenoid valve 32, the blower 36, and the micro servo motor 42 based on the ambient humidity detected by the detection sensor module 2. This causes the micro air pump 31 to operate at full load with its rated voltage, working in conjunction with the blower 36 to output a high-flow air curtain to remove rainwater. The micro servo motor 42 adjusts the angle of the long slit nozzle 41, first blowing water away at an angle parallel to the reflector 6, and then rotating to a preset tilt angle after a preset time to form a rainproof air curtain on the reflector 6. In manual mode, the user presses the manual switch based on visual judgment. The control module, triggered by the manual switch, controls the micro air pump 31, solenoid valve 32, and blower 36. This causes the micro air pump 31 to operate in a low-pressure, energy-saving mode, working in conjunction with the blower 36 to output a gentle air curtain for defogging and blowing away small water droplets. The micro servo motor 42 adjusts the angle of the long slit nozzle 41 to blow away water and mist parallel to the reflector 6. In manual mode, the control module controls the micro air pump 31 and blower 36 to use reduced voltage or intermittent power supply, allowing the micro air pump 31 to operate at low speed and low flow rate, forming a gentle airflow with the blower 36. This is solely for accelerating the evaporation of water mist on the mirror surface and removing small water droplets, achieving energy-saving and low-noise operation. The control module can be a microcontroller or PLC, etc. The application of the control module in this embodiment, outputting corresponding control signals based on input signals, is already widely disclosed in the prior art and will not be elaborated here. The control module and manual switch are located in the driver's cab; the specific location depends on the actual vehicle design.

[0024] Furthermore, the outer casing 11 has a detection air inlet 111 at its bottom. The detection sensor module 2 is fixed to the inner casing 12 in its lower cavity and its position corresponds to the detection air inlet 111. The frame 13 has a detection air outlet 132 at a position corresponding to the lower edge of the reflector 6. The detection air inlet 111 at the bottom of the outer casing 11 reduces wind noise and utilizes the airflow to form an active air intake channel, providing a clean detection air source for the detection sensor module 2. The detection air outlet 132 is located in the back pressure area at the lower edge of the reflector 6 and is used to discharge the detection gas, forming a flow channel. The detection air inlet 111 and the detection air outlet 132 work together to form an independent self-testing air channel for the detection sensor module 2.

[0025] The detection sensor module 2 is a capacitive humidity sensor; in this embodiment, the BL-SD-AST1101 is used. It captures humidity changes within the detection duct in real time, serving as the core logic signal for automatically triggering the air curtain operation. The detection sensor module 2 can operate independently or be linked with an onboard rain sensor and infrared sensor to improve accuracy. In manual mode, the detection sensor module 2 does not participate in control. Rigid dustproof and breathable membranes are installed at the detection air inlet 111 and the detection air outlet 132 to prevent the intrusion of dust, mud, insects, and other foreign objects while ensuring unobstructed airflow in the detection airway, protecting the detection sensor module 2 from contamination and ensuring long-term detection accuracy and device reliability.

[0026] The air source module 3 also includes a micro filter 34. The solenoid valve 32 and the micro filter 34 are mounted on a mounting base 35. The mounting base 35 and the micro air pump 31 are fixed to the inner housing 12 with screws. The blower 36 is fixed to the inner top wall of the inner housing 12. One end of the solenoid valve 32 is connected to the air passage 33, which passes through the housing assembly 1 and communicates with the outside through the air inlet on the housing assembly 1. The other end of the solenoid valve 32 is connected to the micro air pump 31 through the micro filter 34. The blower 36 supplies air to the long slit nozzle 41 through a flexible air guide connector, which is a tapered connector that connects the air outlet of the blower 36 to the long slit nozzle 41. In this embodiment, a 4020 turbine blower is used. The blower 36 serves as the main air supply device for the air curtain, providing the mainstream airflow required to form an effective air curtain, thus solving the technical problem that the long slit nozzle 41 cannot form an effective air curtain due to insufficient output flow from a single air pump. The blower 36 operates at full load with rated voltage in automatic mode, providing sufficient air supply to ensure rain protection. In manual mode, it operates with reduced voltage or intermittent power supply, and can also be independently shut down to reduce energy consumption and noise. The miniature air pump 31 is preferably a disc-type air pump. Airflow is tangentially input from one side of the long-slit nozzle 41 through an air pipe, creating a vortex effect within the flow channel, reducing the working back pressure of the blower 36 and improving overall air supply efficiency. Simultaneously, the miniature air pump 31 can supplement the output airflow of the blower 36, collaboratively forming a sufficient air curtain. In this embodiment, the miniature air pump 31 is an Iwata PAP-04M, which is driven at full power by the control module in automatic mode and operates at low pressure and energy saving by the control module in manual mode. The miniature filter 34 is connected in series at the front end of the miniature air pump 31 to precisely filter the air entering the system, preventing impurities from clogging the nozzles or damaging the air pump components, ensuring long-term stable operation of the air path. The solenoid valve 32 is a two-position, normally closed solenoid valve. In standby mode, when the solenoid valve 32 is energized, it switches from a normally closed state to a normally open state, connecting the air inlet and the micro filter 34. During operation, the localized ram airflow outside the housing assembly 1 passively enters the air passage 33, forming a compound air intake with the active pumping air from the micro air pump 31. This effectively reduces back pressure, supplements flow, and enhances the water removal and rainproofing effect. After operation, the solenoid valve 32 is de-energized and resets to a normally closed state, cutting off the air passage 33 and preventing external airflow from entering. This avoids wind noise, airflow impact, and sand and dust intrusion caused by continuous air intake during operation. The solenoid valve 32 enables the on-demand start and stop of the air passage 33, working in conjunction with the overall system to achieve energy-saving control.

[0027] See Figure 3Furthermore, the micro servo motor 42 is mounted on a servo motor mounting base 421, from which a swing arm 422 and a fixed shaft 423 extend. The swing arm 422 is hinged to the hinge joint 411 of the long slit nozzle 41, and the fixed shaft 423 is fixed to the side wall of the outer casing 11. The long slit nozzle 41 has a hinge shaft 412 extending along its length. Both ends of the hinge shaft 412 are hinged to the side walls of the outer casing 11 at the opening of the outer casing 11. The frame 13 has a folded edge 131 at a position corresponding to the top of the reflector 6. A slot 1311 is formed on the folded edge 131 along its length. The bottom of the long slit nozzle 41 is rotatably mounted in the slot 1311. The long slit nozzle 41 has an air inlet on one side, which is connected to the micro air pump 31 via an air pipe.

[0028] The micro servo motor 42 adjusts the angle to dynamically switch between the "water removal" and "rain protection" functions of the long slit nozzle 41. In automatic mode, the long slit nozzle 41 is driven to blow water away at an angle parallel to the reflector 6. After a few seconds, preferably 3 seconds, it rotates to a position with a 15° tilt angle (reference angle) with the reflector 6, forming a rainproof air curtain. It then resets after the rain. In manual mode, the long slit nozzle 41 maintains an angle parallel to the reflector 6 for gentle blowing. In this embodiment, the outlet size of the long slit nozzle 41 is 0.6mm wide and 180mm long, which can generate a flat, uniform, and high-speed air curtain jet. Through the narrow nozzle design, a stable air curtain covering the entire mirror surface is formed, effectively deflecting rainwater, blowing away water droplets, and accelerating water vapor evaporation.

[0029] This device prioritizes the installation of an independent main power switch, relying on a 12V universal vehicle power supply. The entire detection and control system can only enter standby mode when the user presses the start switch; when not in use, the system is completely powered off and consumes no power. The power cable can be introduced into the vehicle body through a through-hole formed in the rearview mirror bracket 7.

[0030] This device achieves the dual functions of automatic rain protection in rainy weather and manual defogging and water removal in daily use. It has a compact structure, low energy consumption, and reliable dust protection. It can significantly improve driving safety in rainy weather without affecting the original function of the rearview mirror, thus achieving the purpose of the invention.

Claims

1. A self-checking rearview mirror air curtain rainproof and defogging device, comprising a housing assembly (1) and a reflector (6) disposed on the front side of the housing assembly (1), characterized in that: It also includes a detection sensor module (2), an air source module (3), an air curtain nozzle module (4), a control module, and a manual switch. The housing assembly (1) includes an outer housing (11) connected to the vehicle body, an inner housing (12) housed within the outer housing (11), and a frame (13) connected to the opening edges of the outer housing (11) and the inner housing (12) to close the gap between them. The gap between the outer housing (11) and the inner housing (12) is separated by a partition (14) to form an upper cavity (15) and a lower cavity (16). The detection sensor module (2) is fixed to the inner housing (12) and connected to the outside. The air source module (3) is located inside the inner housing (12) and includes a micro air pump (31) connected to the micro air pump (31). The control module includes a solenoid valve (32), an air passage (33) connected to the outside and controlled by the solenoid valve (32), and a blower (36) that supplies air in conjunction with the micro air pump (31). The air curtain nozzle module (4) includes a long slit nozzle (41) and a micro servo motor (42). The micro servo motor (42) switches the working posture of the long slit nozzle (41) by adjusting the angle. The micro servo motor (42) is installed in the upper cavity (15). The long slit nozzle (41) is fixed above the reflector (6) and the upper edge of the frame (13) and connected to the micro air pump (31) through an air pipe. The control module is electrically connected to the detection sensor module (2), the micro air pump (31), the solenoid valve (32), the blower (36), the micro servo motor (42), and the manual switch.

2. The self-testing rearview mirror air curtain rainproof and defogging device according to claim 1, characterized in that: The control module is configured with automatic and manual modes. In automatic mode, the control module automatically controls the micro air pump (31), solenoid valve (32), blower (36) and micro servo motor (42) according to the ambient humidity detected by the detection sensor module (2), so that the micro air pump (31) works at full load with rated voltage and outputs a high flow air curtain in conjunction with the blower (36). The micro servo motor (42) adjusts the angle of the long slit nozzle (41), first blowing water away in a posture parallel to the reflector (6), and then rotating to a preset tilt angle to form a rainproof air curtain on the reflector (6). In manual mode, the control module is triggered by a manual switch to control the micro air pump (31), solenoid valve (32) and blower (36), so that the micro air pump (31) works at low voltage and outputs a soft air curtain in conjunction with the blower (36). The micro servo motor (42) adjusts the angle of the long slit nozzle (41) to blow water away and remove mist in a posture parallel to the reflector (6).

3. The self-testing rearview mirror air curtain rainproof and defogging device according to claim 1, characterized in that: It also includes a reflector adjustment mechanism (5), which has a central ball head (51) on one side facing the reflector (6) and adjustment ball heads (52) on both sides above the central ball head (51). The central ball head (51) serves as the rotation fulcrum of the reflector (6), and the adjustment ball heads (52) are supported by a push rod (521). By extending and retracting the push rod (521), one adjustment ball head (52) is used to control the horizontal tilt of the reflector (6), and the other adjustment ball head (52) is used to control the vertical tilt of the reflector (6).

4. The self-testing rearview mirror air curtain rainproof and defogging device according to claim 1, characterized in that: The reflector adjustment mechanism (5) has fixed ears (53) on both sides. The fixed ears (53) are fixed to the inner wall of the inner shell (12) by a fixed rod (54). A spring retainer (541) is provided on the fixed rod (54). The spring retainer (541) is located outside the fixed ear (53) and cooperates with the annular step on the fixed rod (54) to fix and limit the fixed ear (53).

5. The self-testing rearview mirror air curtain rainproof and defogging device according to claim 1, characterized in that: The micro servo motor (42) is mounted on a servo motor mounting base (421). A swing arm (422) and a fixed shaft (423) extend from the servo motor mounting base (421). The swing arm (422) is hinged to the hinge joint (411) of the long slit nozzle (41), and the fixed shaft (423) is fixed to the side wall of the outer shell (11).

6. The self-testing rearview mirror air curtain rainproof and defogging device according to claim 1, characterized in that: The long slit nozzle (41) is provided with a hinge shaft (412) along its length. The two ends of the hinge shaft (412) are hinged to the side walls of the outer shell (11) at the opening of the outer shell (11). The frame (13) has a folded edge (131) at the position corresponding to the top of the reflector (6). A slot (1311) is provided on the folded edge (131) along its length. The bottom of the long slit nozzle (41) is rotatably disposed in the slot (1311). The long slit nozzle (41) is provided with an air inlet on one side. The air inlet is connected to the micro air pump (31) through an air pipe.

7. The self-testing rearview mirror air curtain rainproof and defogging device according to claim 1, characterized in that: The outer shell (11) has a detection air inlet (111) at the bottom. The detection sensing module (2) is fixed to the inner shell (12) in the lower cavity and its position corresponds to the detection air inlet (111). The frame (13) has a detection air outlet (132) at the position corresponding to the lower edge of the reflector (6). The detection sensing module (2) is a capacitive humidity sensor used to detect ambient humidity.

8. The self-testing rearview mirror air curtain rainproof and defogging device according to claim 7, characterized in that: Rigid dustproof and breathable membranes are installed on both the air inlet (111) and the air outlet (132) of the detection air path.

9. The self-testing rearview mirror air curtain rainproof and defogging device according to claim 1, characterized in that: The gas source module (3) also includes a micro filter (34), the solenoid valve (32) is a two-position two normally closed solenoid valve, one end of the solenoid valve (32) is connected to the gas path (33), and the micro filter (34) is connected in series between the solenoid valve (32) and the micro air pump (31).

10. The self-testing rearview mirror air curtain rainproof and defogging device according to claim 1, characterized in that: The blower (36) is installed on the inner top wall of the inner shell (12) and supplies air to the middle of the long slit nozzle (41) through the flexible air guide connector. The blower (36) operates at full load with rated voltage in automatic mode and operates in manual mode with reduced voltage or intermittent power supply.

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