Vehicle-mounted air quality monitoring module and manufacturing method thereof

Abstract

The invention relates to a vehicle-mounted air quality monitoring module and a manufacturing method thereof, and relates to the field of air quality monitoring, the vehicle-mounted air quality monitoring module comprises a flexible circuit board, a reflecting layer, an MEMS infrared light source and an infrared detection mechanism; the flexible circuit board comprises a first section, a second section and a third section which are connected in sequence, the first section is bent and located between the second section and the third section, a gas guide channel is defined among the first section, the second section and the third section, and openings are formed in the opposite sides of the gas guide channel respectively; the reflecting layer is arranged in the air guide channel; the MEMS infrared light source is mounted on the first section; the infrared detection mechanism is installed on the light emitting path of the MEMS infrared light source and located in the gas guide channel. According to the vehicle-mounted air quality monitoring module, the first section of the flexible circuit board is bent, so that the vehicle-mounted air quality monitoring module can be installed in a narrow space, the installation adaptability is improved, the optical path between the MEMS infrared light source and the infrared detection mechanism can be adjusted, and the detection precision is improved.

Description

Technical Field

[0001] This application relates to the technical field of air quality monitoring, and in particular to an in-vehicle air quality monitoring module. Background Art

[0002] In recent years, people have paid increasing attention to the air quality in indoor or public places. For example, carbon dioxide is one of the important indicators for indoor air quality monitoring. In the field of HVAC (Heating, Ventilating and Air Conditioning), carbon dioxide sensors are used to monitor the carbon dioxide content in indoor or vehicle environments. When the carbon dioxide content exceeds the set limit, fresh air can be introduced through the ventilation system in the HVAC, which can effectively improve the energy utilization efficiency and is of great significance for energy conservation and environmental protection. In addition, as an important component of the new refrigerant R744, carbon dioxide has no damage to the atmospheric ozone layer, with an ODP value of zero and a very small GWP value, making it an ideal refrigerant for future air conditioning technologies. The literature "Research on the Application of Carbon Dioxide Refrigerant" proposed that in the early 1990s, NTH-SINTEF in Norway developed a prototype of a car air conditioner using a carbon dioxide transcritical refrigeration cycle. Since 1994, well-known European companies such as BMW, DALMLERENZ, VOLVO, and Volkswagen have launched a cooperation project called "RACE", jointly developing carbon dioxide car air conditioning systems with well-known European universities, car air conditioner manufacturers, etc., and it has been used as a long-term substitute for car air conditioning refrigerants in many countries. In actual use, once carbon dioxide leaks as an air conditioning refrigerant, it will directly affect the refrigeration efficiency, and a carbon dioxide gas sensor is required to monitor the refrigerant leakage situation. At the same time, there are some toxic and harmful gases such as CO and nitrogen oxides in the vehicle environment due to exhaust emissions.

[0003] NDIR non-dispersive infrared spectroscopy, as an important gas analysis method, is commonly used for quantitative analysis of gases. The principle of using NDIR to analyze the gas to be measured is as follows: Infrared light irradiates the gas to be measured, and the gas to be measured has an absorption function for light of a specific wavelength. According to the Lambert-Beer absorption law, under ideal conditions, knowing the effective absorption optical path of light and the absorption coefficient of molecules at a specific wavelength, the concentration of the gas to be measured can be calculated using the ratio of the light signal before absorption by the gas to be measured to the light signal after absorption.

[0004] With the development of sensor technology towards miniaturization, integration, and portability, higher requirements are put forward for existing NDIR sensors. On the one hand, for monitoring the CO2 content in the vehicle, it is required that the sensor forms a long optical path absorption of the gas in a limited space. When the CO2 concentration is too high, it will make people feel sleepy and stuffy. Therefore, when the CO2 content exceeds the set limit, fresh air needs to be introduced through the ventilation system in the HVAC to reduce the CO2 content in the vehicle, which can effectively improve people's comfort. On the other hand, in complex scenarios, it is often necessary to detect multiple different gases, and a single NDIR sensor with a fixed volume cannot meet the effective detection of multiple gases, and its actual application field is limited. Summary of the Invention

[0005] This application aims to at least solve the technical problems existing in the prior art that the optical path of the micro sensor is limited, which is not conducive to improving the detection accuracy of the sensor, and it cannot take into account the detection of other harmful gases to the human body such as nitrogen oxides and carbon monoxide in vehicle exhaust emissions, and its actual application field is limited. For this reason, this application proposes a vehicle-mounted air quality monitoring module.

[0006] In a first aspect, this application provides a vehicle-mounted air quality monitoring module, including: A flexible circuit board, including a first section, a second section, and a third section connected in sequence. The first section is bent and is between the second section and the third section. An air duct is defined between the first section, the second section, and the third section, and openings are respectively formed on opposite sides of the air duct; A reflective layer, which is disposed in the air duct; A MEMS infrared light source, which is installed on the first section; An infrared detection mechanism, which is installed on the light output path of the MEMS infrared light source and is in the air duct; A metal oxide semiconductor sensor, which is installed on the flexible circuit board.

[0007] By adopting the above technical solutions, the in-vehicle air quality monitoring module provided by the present application integrates a MEMS infrared light source and an infrared detection mechanism on the first hand to monitor the carbon dioxide content, and also integrates a metal oxide semiconductor sensor encapsulated by MEMS technology to monitor the contents of nitrogen oxides and carbon monoxide, so that its actual application fields are wider; on the second hand, the first section of the flexible circuit board is bent, which can not only adjust the optical path between the MEMS infrared light source and the infrared detection mechanism to improve the detection accuracy, but also realize the miniaturized design of the in-vehicle air quality monitoring module, and also naturally defines the opening of the air duct, optimizing the manufacturing process; on the third hand, the white solder mask ink on the flexible circuit board itself is used as the reflective layer without the need to separately manufacture a reflective layer. According to an embodiment of the present application, the in-vehicle air quality monitoring module further includes at least two support pieces; At least two of the support pieces are arranged in the air duct and distributed on at least one side of the air duct. The top end and the bottom end of each support piece are respectively abutted against the flexible circuit board to form the opening between two adjacent support pieces.

[0008] By adopting the above technical solutions, at least two of the first section, the second section and the third section of the flexible circuit board can be supported by the support pieces to form a stable air duct.

[0009] Compared with the situation where openings are formed on the opposite sides of the air duct, in this embodiment, the opening is formed between two support pieces, which can reduce the size of the opening, thereby reducing the large amount of interfering gases other than the target gas from entering the opening and affecting the detection result of the infrared detection mechanism.

[0010] In addition, by designing the length of the support piece, the position of the opening can be better planned so that the opening can be closer to the area where the target gas is located.

[0011] According to an embodiment of the present application, the in-vehicle air quality monitoring module further includes: a filter; The support pieces are respectively arranged on the opposite sides of the air duct. The filter is abutted between two opposite support pieces and encloses an airtight chamber with the two support pieces. The MEMS infrared light source is arranged in the airtight chamber.

[0012] By adopting the above technical solutions, only the infrared light of some bands emitted by the MEMS infrared light source can pass through the filter, and the corresponding infrared detector can only detect the infrared light of some bands. That is, by selectively transmitting the infrared light of a specific band through the filter, the detection of the target gas by the in-vehicle air quality monitoring module can be optimized, and the selectivity and sensitivity can be improved.

[0013] According to an embodiment of the present application, a gasket is provided on a side of the flexible circuit board close to the opening, and the gasket is provided with a placement groove adapted to the top end and the bottom end of the support piece.

[0014] By adopting the above technical solution, the gasket can prevent interfering gases (such as water vapor, etc.) from entering the air duct through the gap between the support piece and the flexible circuit board.

[0015] According to an embodiment of the present application, magnets are provided on a side of the flexible circuit board close to the opening, and the magnets are respectively disposed in the placement grooves one by one to adsorb the support piece.

[0016] By adopting the above technical solution, magnets are provided on a side of the flexible circuit board close to the opening, and the magnets are respectively disposed in the placement grooves one by one to adsorb the support piece.

[0017] According to an embodiment of the present application, the air duct includes a first air duct and a second air duct communicating with the first air duct; The first air duct is defined between the first section and the second section; the second air duct is defined between the first section and the third section.

[0018] According to an embodiment of the present application, the vehicle-mounted air quality monitoring module further includes: a base and an end cover; A receiving groove is provided in the base, the third section is fixedly connected to the receiving groove, the second section is fixedly connected to the end cover, the end cover is detachably mounted on the base, and air holes communicating with the air duct are provided on the base and / or the end cover.

[0019] By adopting the above technical solution, according to the narrow space to be installed, the corresponding base and end cover are configured, and the area between the base and the end cover is used to accommodate the flexible circuit board.

[0020] On the one hand, the base and the end cover are convenient for installation in a narrow space and can protect the flexible circuit board. On the other hand, the third section is fixedly connected to the receiving groove, and the second section is fixedly connected to the end cover, that is, the second section and the third section of the flexible circuit board can be better spaced apart to form a stable air duct.

[0021] According to an embodiment of the present application, a waterproof and breathable film is installed at the air hole.

[0022] Second, the present application provides a manufacturing method of a vehicle-mounted air quality monitoring module, including: Providing a flexible circuit board and arranging a reflective layer on the surface of the flexible circuit board; Mounting a MEMS infrared light source and an infrared detection mechanism on the flexible circuit board respectively; Bend the first section of the flexible circuit board so that the first section of the flexible circuit board is between the second section and the third section of the flexible circuit board, and an air duct is defined between the first section, the second section, and the third section of the flexible circuit board. Opposite sides of the air duct are respectively formed with openings. The MEMS infrared light source and the infrared detection mechanism are located in the air duct, and the infrared detection mechanism is on the light-emitting path of the MEMS infrared light source.

[0023] According to an embodiment of the present application, before arranging a reflective layer on the surface of the flexible circuit board, the manufacturing method further includes: Provide at least two support pieces and mount the at least two support pieces on at least one side of the flexible circuit board; The bending of the first section of the flexible circuit board so that the first section of the flexible circuit board is between the second section and the third section of the flexible circuit board further includes: On the premise that an air duct is defined between the first section, the second section, and the third section of the flexible circuit board, make the top and bottom ends of the support piece respectively abut against the flexible circuit board, and form the opening between two adjacent support pieces In summary, for the vehicle-mounted air quality monitoring module provided by the present application, on the first hand, it integrates a MEMS infrared light source and an infrared detection mechanism to monitor the content of carbon dioxide, and also integrates a metal oxide semiconductor sensor to monitor the content of nitrogen oxides and carbon monoxide, so its actual application field is wider; on the second hand, the first section of the flexible circuit board is bent, which can not only adjust the optical path between the MEMS infrared light source and the infrared detection mechanism to improve the detection accuracy, but also realize the miniaturized design of the vehicle-mounted air quality monitoring module, and also naturally define the opening of the air duct, optimizing the manufacturing process; on the third hand, the white solder mask ink on the flexible circuit board itself is used as the reflective layer without the need to separately manufacture a reflective layer. Description of the Drawings

[0024] Figure 1 is one of the structural schematic diagrams of the vehicle-mounted air quality monitoring module provided by the embodiment of the present application; Figure 2 is another structural schematic diagram of the vehicle-mounted air quality monitoring module provided by the embodiment of the present application; Figure 3 is a third structural schematic diagram of the vehicle-mounted air quality monitoring module provided by the embodiment of the present application; Figure 4 In [Diagram], A is a fourth structural schematic diagram of the vehicle-mounted air quality monitoring module provided by the embodiment of the present application; Figure 4Figure 5 is a schematic structural diagram of the vehicle-mounted air quality monitoring module provided by an embodiment of the present application; Figure 5 Figure 6 is a schematic process diagram of the vehicle-mounted air quality monitoring module provided by an embodiment of the present application.

[0025] Reference numerals: 10, flexible circuit board; 11, first section; 12, second section; 13, third section; 20, reflective layer; 30, MEMS infrared light source; 40, infrared detection mechanism; 50, support sheet; 60, filter; 71, base; 72, end cap; 721, air hole; a, air duct; b, open end; c, airtight chamber. Detailed implementation manners

[0026] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described by referring to the accompanying drawings are exemplary and are only used to explain the present application and should not be construed as a limitation to the present application.

[0027] First, in order to facilitate the description of the relative positional relationship and setting points of each mechanism in the present application, the implementation scenario of the embodiment of the present application will be described here.

[0028] With the development of the concepts of automotive intelligence, safety, and environmental protection, as well as people's attention to air quality and health, improving the air quality inside the vehicle, as well as the comfort and safety of users during riding, has increasingly become the core competitiveness of the development of automotive products.

[0029] However, research has found that there are a large number of volatile organic compounds (VOCs) in the artificial products and interior materials inside the vehicle, such as formaldehyde, benzene series, etc. These volatile organic compounds cause a significant decline in the air quality inside the vehicle. At the same time, since people stay in the vehicle for a long time, the carbon dioxide concentration inside the vehicle will increase with people's breathing, and the increase in carbon dioxide concentration will cause a decline in people's attention and comfort level. At the same time, there will also be some toxic and harmful gases such as CO, nitrogen oxides, etc. in the vehicle environment due to exhaust emissions.

[0030] Next, refer to Figures 1 - 5 Describe the vehicle-mounted air quality monitoring module according to an embodiment of the present application.

[0031] As Figure 1 and Figure 2 shown, the vehicle-mounted air quality monitoring module includes: a flexible circuit board 10, a reflective layer 20, a MEMS infrared light source 30, an infrared detection mechanism 40, and a metal oxide semiconductor sensor.

[0032] The flexible circuit board 10 has the ability to bend, fold, and flex, and includes, but is not limited to, a single-layer flexible circuit board 10, a multi-layer flexible circuit board 10, a rigid-flex circuit board, etc.

[0033] The flexible circuit board 10 includes a first section 11, a second section 12, and a third section 13 connected in sequence. The first section 11 is bent and is between the second section 12 and the third section 13. An air duct a is defined between the first section 11, the second section 12, and the third section 13, and openings b are respectively formed on opposite sides of the air duct a.

[0034] The reflective layer 20 is disposed in the air duct a.

[0035] The MEMS infrared light source 30 is mounted on the first section 11.

[0036] The infrared detection mechanism 40 is installed on the light-emitting path of the MEMS infrared light source 30 and is in the air duct a.

[0037] The metal oxide semiconductor sensor is mounted on the flexible circuit board 10 and is used to monitor nitrogen oxides and carbon monoxide.

[0038] In the above embodiments of the present application, according to the Beer-Lambert law, different types of gases show differences when absorbing light of different wavelengths. The gas type and concentration can be determined by measuring the attenuated wavelength.

[0039] For example, carbon dioxide has significant absorption of infrared wavelengths of 4.26 micrometers. Therefore, the MEMS infrared light source 30 and the infrared detection mechanism 40 are integrated on the flexible circuit board 10 to monitor the content of carbon dioxide.

[0040] At the same time, a metal oxide semiconductor sensor is also integrated on the flexible circuit board 10, and the content of nitrogen oxides and carbon monoxide is monitored through this metal oxide semiconductor sensor.

[0041] In specific implementation, the first section 11 of the flexible circuit board 10 is bent. On the one hand, the optical path between the MEMS infrared light source 30 and the infrared detection mechanism 40 can be adjusted to improve the detection accuracy. On the other hand, according to the size of the space to be installed, the first section 11 of the flexible circuit board 10 is bent so that the flexible circuit board 10 can be placed in this space, realizing the miniaturized design of the vehicle-mounted air quality monitoring module.

[0042] In the related art, an opening b is additionally provided on the vehicle-mounted air quality monitoring module. The opening b is used for the target gas to enter, and the target gas includes carbon dioxide, nitrogen oxides, and carbon monoxide.

[0043] In the above embodiments of the present application, according to the difference in the size of the space where the in-vehicle air quality monitoring module is to be placed, the first section 11 of the flexible circuit board 10 is bent accordingly, so as to naturally define an air duct a and an opening b between the first section 11, the second section 12, and the third section 13 of the flexible circuit board 10. Compared with the related art, the present application saves the manufacturing process of opening the opening b and optimizes the process.

[0044] It should be noted that in the present application, the reflective layer 20 can be the white solder resist ink on the flexible circuit board 10, and the light of the MEMS infrared light source 30 is reflected by the white solder resist ink of the flexible circuit board 10. That is, in the present application, the reflection of infrared light is achieved through the white solder resist ink on the flexible circuit board 10 itself without the need to additionally manufacture the reflective layer 20.

[0045] Of course, it should also be allowed to additionally cover other reflective coatings outside the white solder resist ink, such as additionally covering an aluminum film layer or a Bragg reflection film layer to better reflect infrared light.

[0046] In summary, for the in-vehicle air quality monitoring module provided by the present application, on the one hand, it integrates the MEMS infrared light source 30 and the infrared detection mechanism 40 to monitor the carbon dioxide content, and also integrates a metal oxide semiconductor sensor to monitor the contents of nitrogen oxides and carbon monoxide, with a wider actual application field; on the other hand, the first section 11 of the flexible circuit board 10 is bent, which can not only adjust the optical path between the MEMS infrared light source 30 and the infrared detection mechanism 40 to improve the detection accuracy, but also realize the miniaturization design of the in-vehicle air quality monitoring module, and also naturally define the air duct a and the opening b, optimizing the manufacturing process; on the third hand, the white solder resist ink on the flexible circuit board 10 itself is used as the reflective layer 20 without the need to additionally manufacture the reflective layer 20.

[0047] As Figure 3 and Figure 4 shown, in some embodiments, the in-vehicle air quality monitoring module further includes: a base 71 and an end cap 72.

[0048] A receiving groove is formed in the base 71, the third section 13 is fixedly connected to the receiving groove, the second section 12 is fixedly connected to the end cap 72, the end cap 72 is detachably mounted on the base 71, and air holes 721 communicating with the air duct a are formed in the base 71 and / or the end cap 72.

[0049] In this embodiment, according to the narrow space to be installed, the corresponding base 71 and end cap 72 are configured, and the area between the base 71 and the end cap 72 is used to accommodate the flexible circuit board 10.

[0050] On the one hand, the base 71 and the end cap 72 facilitate installation in a narrow space and at the same time protect the flexible circuit board 10. On the other hand, the third section 13 is fixedly connected to the accommodating groove, and the second section 12 is fixedly connected to the end cap 72, that is, the second section 12 and the third section 13 of the flexible circuit board 10 can be better spaced apart to form a stable air guide channel a.

[0051] In actual implementation, a waterproof and breathable film is installed at the air hole 721 to prevent water vapor and dust from entering the air guide channel a.

[0052] Such as Figure 2 shown, in some embodiments, the vehicle-mounted air quality monitoring module further includes at least two support pieces 50.

[0053] At least two support pieces 50 are arranged in the air guide channel a and are distributed on at least one side of the air guide channel a. The top and bottom ends of each support piece 50 are respectively abutted against the flexible circuit board 10 to form an opening b between two adjacent support pieces 50.

[0054] In this embodiment, at least two of the first section 11, the second section 12, and the third section 13 of the flexible circuit board 10 can be supported by the support piece 50 to form a stable air guide channel a.

[0055] Compared with the openings b formed on the opposite sides of the air guide channel a, in this embodiment, the opening b is formed between two support pieces 50, which can reduce the size of the opening b, thereby reducing the large amount of interfering gases other than the target gas from entering the opening b and affecting the detection result of the infrared detection mechanism 40.

[0056] In addition, by designing the length of the support piece 50, the position of the opening b can be better planned so that the opening b can be closer to the area where the target gas is located.

[0057] The target gas includes carbon dioxide, nitrogen oxides, and carbon monoxide.

[0058] Such as Figure 3 shown, in some embodiments, the vehicle-mounted air quality monitoring module further includes: a filter 60.

[0059] The support pieces 50 are respectively arranged on the opposite sides of the air guide channel a, the filter 60 is abutted between two opposite support pieces 50, and an airtight chamber c is formed by enclosing with the two support pieces 50. A MEMS infrared light source 30 is arranged in the airtight chamber c.

[0060] In this embodiment, only infrared light of some bands emitted by the MEMS infrared light source 30 can pass through the filter 60, and the corresponding infrared detector can only detect infrared light of some bands. That is, by selectively transmitting infrared light of a specific band through the filter 60, the detection of the target gas by the vehicle-mounted air quality monitoring module can be optimized, and the selectivity and sensitivity can be improved.

[0061] In some embodiments, a gasket is provided on the side of the flexible circuit board 10 close to the opening b, and the gasket is provided with placement grooves adapted to the top and bottom ends of the support piece 50.

[0062] In this embodiment, the gasket can prevent interfering gases (such as water vapor, etc.) from entering the air guide channel a through the gap between the support piece 50 and the flexible circuit board 10.

[0063] In some embodiments, magnets are provided on the side of the flexible circuit board 10 close to the opening b, and the magnets are respectively arranged in the placement grooves in one-to-one correspondence to adsorb the support piece 50.

[0064] In this embodiment, the support piece 50 is adsorbed by the magnets so that the support piece 50 can more stably support at least two of the first section 11, the second section 12, and the third section 13 of the flexible circuit board 10.

[0065] The vehicle-mounted air quality monitoring module can be at least one of the following structural forms: One, the air guide channel a includes a first air guide channel.

[0066] The first air guide channel is defined between the first section 11 and the second section 12 and the third section 13; the second section 12 and the third section 13 are in contact with each other.

[0067] Two, the air guide channel a includes a first air guide channel and a second air guide channel communicating with the first air guide channel.

[0068] The first air guide channel is defined between the first section 11 and the second section 12; a second air guide channel (not shown) is defined between the first section 11 and the third section 13.

[0069] Among them, the sizes of the vehicle-mounted air quality monitoring modules constructed by the above-mentioned embodiments will be different, that is, the vehicle-mounted air quality monitoring module constructed by the first embodiment has a longer length but a smaller thickness compared with the second embodiment, and vice versa, the vehicle-mounted air quality monitoring module constructed by the second embodiment has a shorter length and a larger thickness compared with the first embodiment.

[0070] As Figure 5 shown, the present application also provides a manufacturing method of a vehicle-mounted air quality monitoring module, including: step 110, step 120, and step 130.

[0071] Step 110: Provide a flexible circuit board 10 and coat a reflective layer 20 on the surface of the flexible circuit board 10.

[0072] Step 120: Mount the MEMS infrared light source 30 and the infrared detection mechanism 40 on the flexible circuit board 10 respectively.

[0073] Step 130: Bend the first section 11 of the flexible circuit board 10 so that the first section 11 of the flexible circuit board 10 is between the second section 12 and the third section 13 of the flexible circuit board 10. An air duct a is defined among the first section 11, the second section 12, and the third section 13 of the flexible circuit board 10. Openings b are respectively formed on opposite sides of the air duct a. The MEMS infrared light source 30 and the infrared detection mechanism 40 are located in the air duct a, and the infrared detection mechanism 40 is on the light-emitting path of the MEMS infrared light source 30.

[0074] In this embodiment, the MEMS infrared light source 30 and the infrared detection mechanism 40 are integrated on the flexible circuit board 10 to monitor the content of carbon dioxide.

[0075] Meanwhile, a metal oxide semiconductor sensor is also integrated on the flexible circuit board 10 to monitor the content of nitrogen oxides and carbon monoxide through this metal oxide semiconductor sensor.

[0076] During specific implementation, bending the first section 11 of the flexible circuit board 10 can, on the one hand, adjust the optical path between the MEMS infrared light source 30 and the infrared detection mechanism 40 to improve the detection accuracy. On the other hand, according to the size of the space to be installed, the first section 11 of the flexible circuit board 10 is bent so that the flexible circuit board 10 can be placed in this space, realizing the miniaturized design of the vehicle-mounted air quality monitoring module.

[0077] In the related art, an opening b is additionally formed on the vehicle-mounted air quality monitoring module. This opening b is used for the target gas to enter, and the target gas includes carbon dioxide, nitrogen oxides, and carbon monoxide.

[0078] In the above embodiment of the present application, according to the difference in the size of the space where the vehicle-mounted air quality monitoring module is to be placed, the first section 11 of the flexible circuit board 10 is bent accordingly, so that the air duct a and the opening b are naturally defined among the first section 11, the second section 12, and the third section 13 of the flexible circuit board 10. Compared with the related art, the present application saves the manufacturing process of opening the opening b and optimizes the process.

[0079] It should be noted that in the present application, the reflective layer 20 can be the white solder mask ink on the flexible circuit board 10. The light of the MEMS infrared light source 30 is reflected by the white solder mask ink of the flexible circuit board 10. That is, in the present application, the reflection of infrared light is realized through the white solder mask ink on the flexible circuit board 10 itself without additionally manufacturing the reflective layer 20.

[0080] Of course, it should also be allowed to additionally cover other reflective coatings outside the white solder mask ink, such as additionally covering an aluminum film layer or a Bragg reflection film layer to better reflect infrared light.

[0081] In summary, the in-vehicle air quality monitoring module provided by this application integrates a MEMS infrared light source 30 and an infrared detection mechanism 40 in the first aspect to monitor the content of carbon dioxide, and also integrates a metal oxide semiconductor sensor to monitor the content of nitrogen oxides and carbon monoxide, with a wider actual application field; in the second aspect, the first section 11 of the flexible circuit board 10 is bent, which can not only adjust the optical path between the MEMS infrared light source 30 and the infrared detection mechanism 40 to improve the detection accuracy, but also realize the miniaturized design of the in-vehicle air quality monitoring module, and also naturally defines the open end b of the air duct a, optimizing the manufacturing process; in the third aspect, the white solder mask ink on the flexible circuit board 10 itself is used as the reflective layer 20, without the need to additionally manufacture the reflective layer 20.

[0082] In some embodiments, before coating the reflective layer 20 on the surface of the flexible circuit board 10, the manufacturing method further includes: Providing at least two support pieces 50 and mounting the at least two support pieces 50 on at least one side of the flexible circuit board 10.

[0083] When the first section 11 of the flexible circuit board 10 is bent so that the first section 11 of the flexible circuit board 10 is between the second section 12 and the third section 13 of the flexible circuit board 10, it further includes: On the premise that an air duct a is defined between the first section 11, the second section 12 and the third section 13 of the flexible circuit board 10, the top and bottom ends of the support piece 50 are respectively abutted against the flexible circuit board 10, and an open end b is formed between two adjacent support pieces 50.

[0084] In this embodiment, compared with the open ends b formed on the opposite sides of the air duct a, the open end b in this embodiment is formed between two support pieces 50, which can reduce the size of the open end b, thereby reducing the large amount of interfering gases other than the target gas from entering the open end b and affecting the detection result of the infrared detection mechanism 40.

[0085] In addition, by designing the length of the support piece 50, the position of the open end b can be better planned so that the open end b can be closer to the area where the target gas is located.

[0086] The above are all the preferred embodiments of this application. The protection scope of this application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. An in-vehicle air quality monitoring module, characterized in that, Comprising: A flexible circuit board (10), including a first section (11), a second section (12), and a third section (13) connected in sequence. The first section (11) is bent and located between the second section (12) and the third section (13). An air duct (a) is defined among the first section (11), the second section (12), and the third section (13), and openings (b) are respectively formed on opposite sides of the air duct (a). A reflective layer (20), which is disposed in the air duct (a). A MEMS infrared light source (30), which is mounted on the first section (11). An infrared detection mechanism (40), which is mounted on the light-emitting path of the MEMS infrared light source (30) and is located in the air duct (a). A metal oxide semiconductor sensor, which is mounted on the flexible circuit board (10).

2. The in-vehicle air quality monitoring module according to claim 1, wherein The vehicle-mounted air quality monitoring module further includes at least two support pieces (50). At least two of the support pieces (50) are disposed in the air duct (a) and distributed on at least one side of the air duct (a). The top and bottom ends of each support piece (50) are respectively abutted against the flexible circuit board (10) to form the opening (b) between two adjacent support pieces (50).

3. The in-vehicle air quality monitoring module according to claim 2, wherein The vehicle-mounted air quality monitoring module further includes: a filter (60). The support pieces (50) are respectively disposed on opposite sides of the air duct (a). The filter (60) is abutted between two opposite support pieces (50) and encloses an airtight chamber (c) with the two support pieces (50). The MEMS infrared light source (30) is disposed in the airtight chamber (c).

4. The in-vehicle air quality monitoring module according to claim 2, wherein A sealing gasket is provided on one side of the flexible circuit board (10) close to the opening (b), and a placement groove for cooperating with the top and bottom ends of the support piece (50) is provided on the sealing gasket.

5. The in-vehicle air quality monitoring module according to claim 4, characterized in that, A magnet is provided on one side of the flexible circuit board (10) close to the opening (b), and the magnets are respectively disposed in the placement grooves in one-to-one correspondence to adsorb the support pieces (50).

6. The in-vehicle air quality monitoring module according to any one of claims 1-5, characterized in that, The air duct (a) includes a first air duct and a second air duct communicating with the first air duct. The first air duct is defined between the first section (11) and the second section (12); the second air duct is defined between the first section (11) and the third section (13).

7. The in-vehicle air quality monitoring module according to any one of claims 1-5, characterized in that, The vehicle-mounted air quality monitoring module further includes: a base (71) and an end cap (72). A receiving groove is formed in the base (71). The third section (13) is fixedly connected in the receiving groove. The second section (12) is fixedly connected to the end cap (72). The end cap (72) is detachably mounted on the base (71). An air hole (721) communicating with the air duct (a) is formed in the base (71) and / or the end cap (72).

8. The in-vehicle air quality monitoring module according to claim 7, wherein, A waterproof and breathable film is mounted at the air hole (721).

9. A manufacturing method of a vehicle-mounted air quality monitoring module Provide a flexible circuit board (10) and dispose a reflective layer (20) on the surface of the flexible circuit board (10); Mount a MEMS infrared light source (30), an infrared detection mechanism (40), and a metal oxide semiconductor sensor on the flexible circuit board (10) respectively; Bend the first section (11) of the flexible circuit board (10) so that the first section (11) of the flexible circuit board (10) is between the second section (12) and the third section (13) of the flexible circuit board (10), and an air duct (a) is defined among the first section (11), the second section (12), and the third section (13) of the flexible circuit board (10). Opposite sides of the air duct (a) respectively form openings (b). The MEMS infrared light source (30) and the infrared detection mechanism (40) are inside the air duct (a), and the infrared detection mechanism (40) is on the light-emitting path of the MEMS infrared light source (30).

10. The manufacturing method of the vehicle-mounted air quality monitoring module according to claim 9, characterized in that, Before disposing the reflective layer (20) on the surface of the flexible circuit board (10), the manufacturing method further includes: Provide at least two support sheets (50) and mount the at least two support sheets (50) on at least one side of the flexible circuit board (10); Bending the first section (11) of the flexible circuit board (10) so that the first section (11) of the flexible circuit board (10) is between the second section (12) and the third section (13) of the flexible circuit board (10) further includes: On the premise that the air duct (a) is defined among the first section (11), the second section (12), and the third section (13) of the flexible circuit board (10), make the top and bottom ends of the support sheet (50) respectively abut against the flexible circuit board (10), and form the opening (b) between two adjacent support sheets (50).

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