A self-circulating defogging system for automotive lights
By introducing a humidity sensor and an electronically controlled self-circulating defogging system into automotive lights, the problem of fogging in the lights is solved, keeping the inside of the lights dry, preventing the desiccant from failing, and ensuring the long-term performance of the lights.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WUHU ANRUI OPTOELECTRONICS CO LTD
- Filing Date
- 2025-06-23
- Publication Date
- 2026-06-30
AI Technical Summary
In existing technologies, automotive lights are prone to fogging in cold weather, resulting in poor lighting performance. Existing measures such as desiccants or anti-fog coatings cannot permanently solve the fogging problem.
The self-circulating defogging system, composed of a humidity sensor and electronic valve, identifies the humidity and temperature inside the lamp and controls the fan and desiccant box to form air circulation, maintaining the humidity and temperature parameters inside the lamp.
It effectively prevents luminaires from fogging, avoids desiccant failure, and ensures a dry and transparent internal environment for the luminaires.
Smart Images
Figure CN224434202U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of automotive lighting technology, and in particular to a self-circulating defogging system for automotive lighting. Background Technology
[0002] Automotive lights not only play a decisive role in the vehicle's appearance, but their primary function is illumination. According to incomplete statistics, traffic accidents involving vehicles driven at night or in insufficient natural light account for more than 30% of all accidents, highlighting the importance of front headlights. Due to varying seasonal climates, in colder northern regions, headlight lenses are prone to fogging, severely affecting illumination and causing problems such as non-compliant light patterns, dimmed road lights, inability to recognize traffic lights, and insufficient viewing angles. Besides external weather and seasonal factors, internal humidity and engine compartment temperatures are also significant contributors to headlight fogging.
[0003] To improve the fogging problem of car lights, manufacturers typically place desiccants or use anti-fog coatings inside the lights, or install vent caps on the light housing to facilitate gas flow. These measures are effective in the short term, but if the desiccant or anti-fog coating fails, the fogging problem cannot be solved by the light's structure and vents alone. For example, patent CN209484470U discloses a car light with a removable desiccant compartment, comprising a light housing, a desiccant, and a desiccant storage housing. The desiccant is housed in the storage housing, which is detachably mounted on the light housing. The main structure of the storage housing is located outside the light housing, and the portion of the storage housing inside the light housing has a through hole connecting the interior of the light housing to the interior of the storage housing. If the desiccant in the car light fails, the fogging problem inside the light will not be resolved. Utility Model Content
[0004] To address the shortcomings of existing technologies, this utility model provides a self-circulating defogging system for automotive lights, which can completely solve the problem of fogging in lights and prevent desiccant from becoming ineffective.
[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:
[0006] The self-circulating defogging system for automotive lights includes a lamp body and a desiccant box assembly, as well as a connected humidity sensor and an electronic valve. The humidity sensor is located inside the lamp body, and the electronic valve is located on the lamp body to control the connection between the inside of the lamp body and the desiccant box assembly.
[0007] Further or preferred:
[0008] It also includes a temperature sensor, which is located inside the lamp body and connected to the electronic valve.
[0009] The desiccant box assembly includes a recyclable desiccant box and a breathable membrane.
[0010] The lamp body is divided into a hot zone and a cold zone, and the humidity sensor is located in the cold zone.
[0011] The distance from the humidity sensor to the lens inside the lamp body is 30-50mm.
[0012] A fan is installed on the lamp body corresponding to the electronic valve.
[0013] The fan and desiccant box assembly are integrated side by side.
[0014] Compared with the prior art, this utility model has the following advantages:
[0015] This automotive lighting self-circulating defogging system is rationally designed. It uses an internal humidity sensor to identify the internal environment of the lighting fixture and feeds back to the electronic switch to dehumidify, ventilate, and dry, forming an air and dry circulation system. This ensures the humidity and temperature of the internal environment of the lighting fixture and can completely solve the problem of fogging in the lighting fixture, preventing the desiccant from becoming ineffective. Attached Figure Description
[0016] The following is a brief explanation of the contents of each of the accompanying drawings and the markings in the drawings:
[0017] Figure 1 This is a schematic diagram of the defogging system of this utility model. Detailed Implementation
[0018] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and through the description of the examples.
[0019] like Figure 1 As shown, the self-circulating defogging system for automotive lights includes a lamp body, a desiccant box assembly, a connected humidity sensor, and an electronic valve; the humidity sensor is located inside the lamp body, and the electronic valve is located on the lamp body to control the connection between the inside of the lamp body and the desiccant box assembly.
[0020] This utility model's self-circulating defogging system for automotive lights is rationally designed. It uses an internal humidity sensor to identify the internal environment of the light fixture and provides feedback to an electronic switch for dehumidification. It also provides ventilation and drying, forming an air and drying circulation system to ensure the humidity and temperature of the internal environment of the light fixture. This system can completely solve the problem of fogging in the lights and prevent the desiccant from becoming ineffective.
[0021] Furthermore, this utility model system also includes a temperature sensor, which is located inside the lamp body and connected to the electronic valve. The lamp body is divided into a hot zone and a cold zone, with the humidity sensor located in the cold zone; the distance from the humidity sensor to the lens inside the lamp body is 30-50mm; humidity data monitoring is accurate.
[0022] The desiccant box assembly includes a recirculating desiccant box and a breathable membrane. A fan is installed on the lamp body corresponding to the electronic valve; the fan and desiccant box assembly are integrated side by side; the internal humidity sensor of the lamp identifies the internal environment and feeds back to the electronic switch to dehumidify; the fan turns on for ventilation and drying, forming an efficient air and drying circulation system.
[0023] The preferred specific example of this utility model is as follows:
[0024] A self-circulating defogging system for automotive lighting includes electronic valves A and B, a circulating desiccant box assembly, humidity and temperature sensors, a housing, and other assembled components. The system uses sensors to detect the humidity and temperature inside the lighting fixture, opening the electronic valves to dehumidify. Gas inside the lamp circulates with the electronic valves open, absorbing moisture through the desiccant. When the required humidity level is reached, the sensor detects this and closes valve A. At this point, electronic valve B opens, connecting the desiccant to the outside air, achieving a dry state. Electronic valve B closes, completing one cycle; at this point, no fog is generated inside the lighting fixture.
[0025] The desiccant assembly reduces the temperature and humidity of the gas flowing through the lamp; it absorbs moisture from the gas; in one embodiment, the desiccant assembly includes a recyclable desiccant box, a fixed bracket, and a fixed cover plate. The moisture-absorbing desiccant box is assembled on the fixed bracket by a fixing element, and the overall outer shell is connected and fixed to the inside of the lamp body.
[0026] Humidity sensors are located approximately 30-50mm from the cold zone of the luminaire and near the lens. Working principle: When humidity exceeds a certain range, the fan activates, blowing air to balance the cold and hot zones within the luminaire. Under normal temperature and pressure conditions, the breathable membrane allows for airflow and gas exchange within the luminaire. The fan is normally closed but can be opened during operation. A high-permeability membrane is used for the breathable membrane.
[0027] This invention can completely solve the problem of fogging in lamps and prevent desiccant from becoming ineffective; it optimizes the air circulation inside the lamp and uses electronic sensing to control the internal temperature and humidity of the lamp; it uses an electronic control valve to control the product's on / off switch, while the switch can prevent dust from entering the lamp's interior.
[0028] The above description is only a preferred embodiment of the present utility model. The above technical features can be arbitrarily combined to form multiple embodiments of the present utility model.
[0029] The present invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the concept and technical solution of the present invention, or the direct application of the concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.
Claims
1. A self-circulating defogging system for automotive lamps, comprising a lamp body and a desiccant box assembly, characterized in that: It also includes a connected humidity sensor and an electronic valve. The humidity sensor is located inside the lamp body, and the electronic valve is located on the lamp body to control the connection between the inside of the lamp body and the desiccant box assembly.
2. The self-circulating defogging system for automotive lights as described in claim 1, characterized in that: It also includes a temperature sensor, which is located inside the lamp body and connected to the electronic valve.
3. The self-circulating defogging system for automotive lights as described in claim 1, characterized in that: The desiccant box assembly includes a recyclable desiccant box and a breathable membrane.
4. The self-circulating defogging system for automotive lights as described in claim 1, characterized in that: The lamp body is divided into a hot zone and a cold zone, and the humidity sensor is located in the cold zone.
5. The self-circulating defogging system for automotive lights as described in claim 4, characterized in that: The distance from the humidity sensor to the lens inside the lamp body is 30-50mm.
6. The self-circulating defogging system for automotive lights as described in claim 3, characterized in that: A fan is installed on the lamp body corresponding to the electronic valve.
7. The self-circulating defogging system for automotive lights as described in claim 6, characterized in that: The fan and desiccant box assembly are integrated side by side.