Nitrogen-oxygen sensor electric control structure

Abstract

The utility model discloses an electric control structure of a nitrogen-oxygen sensor, which relates to the technical field of nitrogen-oxygen sensors and comprises a shell, an external socket, a connecting plug, a circuit board and a rear cover. The shell is provided with an avoiding opening and is provided with a flange and a groove, the external socket and the connecting plug are clamped through the groove and the flange, the cylinder is riveted and fixed on the shell, and the external socket and the connecting plug are further provided with a limiting table, a guide column and a terminal for positioning and connecting a circuit board; and the rear cover is clamped and buckled with the groove of the shell through the flange, so that the overall sealing performance is enhanced. The structure realizes the functions of stable transmission of detection data, reliable protection of an internal circuit and adaptation to a complex external environment through specific design. Compared with the prior art, the connection process is optimized, the reliability is improved, the production process is simplified, the efficiency is improved, the circuit board is accurately positioned to guarantee the electrical performance, and the sealing effect is enhanced to adapt to severe environments.

Description

TECHNICAL FIELD

[0001] The utility model relates to nitrogen oxygen sensor technical field, concretely is a nitrogen oxygen sensor electric control structure. BACKGROUND

[0002] As the key equipment for detecting and monitoring nitrogen oxides, nitrogen oxygen sensors play an indispensable role in many fields such as environmental protection, automobiles, industry, aerospace, etc. In particular, in the automobile industry, nitrogen oxygen sensors are the core monitoring components of vehicle SCR treatment systems, which bear the responsibility of monitoring the nitrogen oxide composition in engine exhaust gas and transmitting information to the control system for feedback, instructing the SCR treatment system to purify the exhaust gas, which is of great significance for reducing automobile exhaust pollution and protecting the environment. A nitrogen oxygen sensor mainly consists of an electric control and a probe, where the electric control part is responsible for transmitting the test data collected by the probe to the host ECU. However, the working environment of nitrogen oxygen sensors is extremely harsh. It is usually installed on the automobile chassis and directly exposed to the external environment. The strong vibration during vehicle driving, immersion in rainwater, and temperature and humidity changes under various weather conditions all pose strict requirements on the electric control structure of nitrogen oxygen sensors.

[0003] In the existing nitrogen oxygen sensor electric control structure technology, in order to protect the internal circuit board, a gasket is usually added between the lower layer of the circuit board and the shell to isolate them, and the shell is filled with silicone gel. At the same time, in the connection of the external socket, the connecting plug, and the rear cover with the shell, the glue bonding method is widely used. However, this traditional process has many drawbacks. From the production process point of view, the glue bonding needs to be fixed with a cable tie or other special tooling equipment before solidification, and needs to be waited for the glue to solidify in a specific location, which not only consumes a lot of time, but also increases the cost of equipment and location in the production process, reduces the production efficiency, and is difficult to meet the production demand of large scale and high efficiency. In terms of product performance, the connection between parts is unstable when the glue is not solidified, and if it is moved during this period, it is easy to cause poor sealing. Moreover, under the influence of various climate temperature and humidity changes, the adhesive properties of the glue will also be challenged, which may cause problems such as poor adhesion, sealing failure, etc., allowing water vapor, dust and other impurities to enter the interior, affecting the normal work of the circuit board, and thus reducing the detection accuracy and reliability of the nitrogen oxygen sensor, and even causing failure. In addition, in the installation link of the circuit board, the traditional process lacks precise positioning structure, and it is difficult to ensure that the installation position of the circuit board in each product is completely consistent, which may cause the circuit board to contact the inner surface of the shell, causing short circuit and other serious problems, affecting the electrical performance and service life of the sensor.

[0004] With the increasingly stringent environmental standards and the increasing demand for sensor performance in the automotive industry, the existing nitrogen oxygen sensor electronic control structure technology has been difficult to meet market demand. Therefore, we propose a nitrogen oxygen sensor electronic control structure process scheme to ensure product reliability and simplify production process. Utility model content

[0005] The utility model discloses a nitrogen oxygen sensor electronic control structure, through the specific structure design between casing, external socket, connecting plug, circuit board and back cover, recess and flange engagement, cylinder riveting fixed, limit station positioning and glue seal, the stable transmission of detection data, the reliable protection of internal circuit and the function of adapting complex external environment are realized in cooperation.

[0006] To realize the above-mentioned purpose, the utility model provides the following technical scheme:

[0007] A nitrogen oxygen sensor electronic control structure, including casing, external socket, connecting plug, circuit board, back cover, in the whole nitrogen oxygen sensor electronic control system, casing plays the role of bearing and protecting internal components, external socket is used to carry out electrical connection with external equipment to transmit data and receive instruction, connecting plug is the interface of connecting other related components, circuit board is the core component of realizing various electronic functions, is responsible for signal processing, data transmission etc. Work, back cover plays the role of sealing and protection to whole structure, prevents dust, moisture etc. From entering inside and influences component performance.

[0008] Two avoiding mouths are formed on the casing, and the two avoiding mouths are used to provide mounting space for the external socket and the connecting plug to avoid interference during assembly. The shell flange is arranged on the outer side of the avoiding mouth, and the shell flange is used to cooperate with the recess on the external socket and the connecting plug to realize the close connection of the two components and the casing, so as to ensure the stability and sealing of the connection. The shell groove is arranged on the bottom of the shell side wall, and the shell groove is mainly used to cooperate with the back cover flange on the back cover, so as to further strengthen the sealing and stability of the whole structure.

[0009] The outer socket bottom is provided with a groove A, which is engaged with the corresponding shell flange. When the groove A is engaged with the shell flange, the outer socket can be stably installed on the shell. At the same time, the adhesive sealant is applied at the engagement position, which further enhances the sealing and firmness of the connection, preventing water vapor, dust and other factors from entering the interior to affect the electrical connection. The outer socket bottom side is provided with a limiting table A, and the limiting table A is provided with a recess, and the recess is provided with a terminal A. The limiting table A has two main functions: one is to position the circuit board during installation, ensuring that the circuit board can accurately butt joint with the terminal A; the second is to keep a certain distance between the circuit board and the inner surface of the shell, avoiding the short circuit caused by the direct contact between the circuit board and the shell. The terminal A is a key component for electrical connection between the outer socket and the circuit board, and through which the signal of the external device can be transmitted to the circuit board for processing. The limiting table A is provided with a guide column A and a cylinder A on both sides. The guide column A provides guidance for the installation of the circuit board, so that the circuit board can be accurately pressed into the guide column A and connected with the terminal A. The cylinder A passes through the shell via hole during assembly with the shell, and the cylinder head is enlarged to an umbrella-shaped structure by penetrating the umbrella-shaped riveting part A, so that the outer socket can be firmly fixed on the shell, preventing it from loosening or falling off.

[0010] The connecting plug bottom is provided with a groove B, which is engaged with the corresponding shell flange. Similarly, the engagement of the groove B with the shell flange and the application of the adhesive sealant can tightly install the connecting plug on the shell. The connecting plug bottom side is provided with a limiting table B, and the limiting table B is provided with a recess, and the recess is provided with a terminal B. The limiting table B and the terminal B have similar functions as the limiting table A and the terminal A. The limiting table B positions and keeps a distance between the circuit board and the inner surface of the shell, and the terminal B realizes the electrical connection between the connecting plug and the circuit board. The limiting table B is provided with a guide column B and a cylinder B on both sides. The guide column B provides guidance for the installation of the circuit board, and the cylinder B forms an umbrella-shaped structure after penetrating the umbrella-shaped riveting part B, thereby tightly fixing the connecting plug on the shell.

[0011] The rear cover is provided with a rear cover flange on the outer side, which is engaged with the shell groove provided around the bottom of the shell side wall. When the rear cover flange is engaged with the shell groove, the rear cover can be tightly installed on the shell. At the same time, the adhesive sealant is applied on the shell groove, which can further improve the sealing performance and prevent the external environment from affecting the internal components. The rear cover end is extended upward to set a rear cover buckle, which is buckled on the shell side. This buckling method further enhances the firmness of the connection between the rear cover and the shell.

[0012] The guide post A and the guide post B are one or more. The purpose of setting one or more guide posts is to better guide the installation of the circuit board, ensuring that the circuit board can be accurately and correctly docked with the terminal A and the terminal B. Multiple guide posts can provide more accurate guidance, improving the accuracy and stability of the installation.

[0013] The cylinder A and the cylinder B pass through the shell via hole when assembled with the shell, and the cylinder head outer diameter is enlarged to an umbrella-shaped structure by penetrating into the umbrella-shaped riveting part A and the umbrella-shaped riveting part B, so that it cannot be separated from the shell via hole. This riveting method can firmly fix the external socket and the connecting plug on the shell. Before the glue has not solidified to produce adhesion, the connection stability between the components can be ensured, and problems such as poor sealing caused by displacement during moving can be avoided, so that the next production process can be directly carried out, and the production efficiency is improved.

[0014] The limiting table A and the limiting table B are consistent in height and higher than the inner surface of the shell. When the circuit board is pressed in, it plays a positioning and limiting role and makes the circuit board have a certain distance from the inner surface of the shell. The consistent height of the limiting table A and the limiting table B can ensure the levelness and consistency of the circuit board during installation, so that the installation position of the circuit board in each product is the same, which is conducive to improving the quality stability of the product. At the same time, maintaining a certain distance from the inner surface of the shell can avoid short circuit and other faults caused by direct contact between the circuit board and the shell, and improve the reliability of the product.

[0015] The groove A corresponds to the shell flange, and the groove B corresponds to the shell flange. When the groove A and the groove B are correspondingly clamped, point the adhesive sealing glue on the groove A and the groove B. Pointing the adhesive sealing glue can fill the small gap between the groove A, the groove B and the shell flange, enhance the sealing of the connection, prevent water vapor, dust and other things from entering the inside to affect the stability of the electrical connection, and at the same time can improve the firmness of the connection, ensure the tight and reliable connection between the external socket and the connecting plug and the shell.

[0016] When the rear cover flange is clamped with the shell groove which is arranged around the bottom of the shell side wall, point the adhesive sealing glue on the shell groove. Similarly, pointing the adhesive sealing glue on the shell groove can further enhance the sealing of the connection between the rear cover and the shell, prevent water vapor, dust and other things in the external environment from entering the inside, cause damage to the circuit board and other components, and thus improve the reliability and stability of the entire nitrogen oxygen sensor electronic control structure.

[0017] When the nitrogen oxygen sensor works, the probe detects the nitrogen oxide data in the exhaust gas and transmits it to the circuit board connected thereto. After the circuit board receives the data, the data is transmitted to the external device or host ECU through the terminals A and B on the external connector and the connecting plug. In this process, the groove A at the bottom of the external connector is engaged with the shell flange, and the adhesive sealant is applied, and the groove B of the connecting plug is also engaged with the shell flange in the same way, which ensures the sealing and stability of the connection, avoids water vapor, dust and other interference with data transmission. Cylinder A and cylinder B pass through the shell via hole and rivet to form an umbrella-shaped structure, which firmly fixes the external connector and the connecting plug on the shell, even if the glue has not cured, it does not affect the connection of the components, and ensures the stability of the data transmission path. The limiting table A and the limiting table B are higher than the inner surface of the shell, and when the circuit board is pressed in, it is accurately positioned to ensure that the installation position is consistent every time, and the data transmission line connection is accurate. At the same time, the circuit board and the inner surface of the shell maintain a safe distance to prevent short circuit caused by contact and ensure normal operation of the circuit. The rear cover flange of the rear cover is engaged with the shell groove and the adhesive is applied, and the rear cover is buckled on the side of the shell, further sealing the entire structure, protecting the internal circuit board and other components from external environmental erosion, and ensuring the stable operation of the nitrogen oxygen sensor electronic control structure, continuously and accurately transmitting nitrogen oxide detection data.

[0018] Compared with the prior art, the beneficial effects of the present application are:

[0019] Optimize the connection process and improve product reliability: The traditional nitrogen oxygen sensor electronic control structure is unstable when the glue has not cured, and is easy to be displaced due to movement, resulting in poor sealing. This technology has achieved a breakthrough in connection design. The cylindrical structure of the external connector and the connecting plug cooperates with the shell via hole to form a firm umbrella-shaped riveting structure. Even if the glue has not cured, the components can be tightly and stably connected, greatly reducing the risk of sealing failure caused by loose connection, ensuring that water vapor, dust and other impurities cannot enter the interior in complex environments, effectively ensuring the detection accuracy of the sensor and the stability of data transmission, and significantly improving the reliability and service life of the product.

[0020] Simplify the production process and improve production efficiency: The existing process needs to use a strap or special tooling equipment to fix the components during the glue curing process, and occupies the site to wait for the glue to cure, which consumes a lot of time and resources. However, the flange and groove engagement of the present nitrogen oxygen sensor electronic control structure, combined with the point glue application method and the cylindrical riveting fastening technology, enables the components to be stably connected before the glue is cured, so that the subsequent production process can be carried out directly. This improvement greatly simplifies the production process, shortens the production cycle, reduces the investment in tooling equipment and site, significantly improves the production efficiency, reduces the production cost, and enhances the competitiveness of the product in the market.

[0021] Precise positioning of the circuit board ensures electrical performance: During the installation of the circuit board, the traditional structure cannot ensure the accurate and consistent installation position of the circuit board every time, which may cause the circuit board to be in contact with the inner surface of the shell, resulting in short circuit and affecting the electrical performance. In this technology, the height of the limiting table on the external socket and the connecting plug is consistent and higher than the inner surface of the shell. When the circuit board is pressed in, it plays a precise positioning and limiting role, ensuring the height consistency of the installation position of the circuit board. At the same time, the limiting table keeps a safe distance between the circuit board and the inner surface of the shell, effectively avoiding short circuit failure, ensuring stable and reliable circuit connection, and improving the overall electrical performance and working stability of the sensor.

[0022] Enhanced sealing effect, suitable for harsh environment: The nitrogen oxygen sensor is installed on the automobile chassis and faces harsh environments such as vibration, rainwater immersion, and drastic changes in temperature and humidity. The sealing method of the prior art has deficiencies in dealing with these complex environments. This structure applies adhesive sealant at multiple key connection points, such as the matching point of the groove and the flange, and combines the tight fitting of the rear cover buckle and the shell groove to form a multiple sealing protection system. This reinforced sealing design effectively blocks water, dust, and corrosive substances from the outside, ensuring that the internal circuit board and electronic components are not eroded, allowing the sensor to operate stably in harsh environments for a long time, improving the sensor's adaptability and reliability in different environments. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a three-dimensional schematic diagram of the electronic control structure of the nitrogen oxygen sensor of the utility model;

[0024] Figure 2 It is a schematic diagram of the external socket and the connecting plug of the electronic control structure of the nitrogen oxygen sensor of the utility model;

[0025] Figure 3 It is a schematic diagram of the internal shell of the electronic control structure of the nitrogen oxygen sensor of the utility model;

[0026] Figure 4 It is a schematic diagram of the installation of the circuit board into the shell of the electronic control structure of the nitrogen oxygen sensor of the utility model;

[0027] Figure 5 It is a sectional view of the electronic control structure of the nitrogen oxygen sensor of the utility model;

[0028] In the figure: 1, shell; 2, external socket; 3, connecting plug; 4, circuit board; 5, rear cover; 11, inner surface of the shell; 12, shell groove; 13, shell flange; 21, guide column A; 22, cylinder A; 23, limiting table A; 24, terminal A; 25, groove A; 31, guide column B; 32, cylinder B; 33, limiting table B; 34, terminal B; 35, groove B; 51, rear cover buckle; 52, rear cover flange; 221, umbrella-shaped riveting part A; 321, umbrella-shaped riveting part B. Detailed Implementation

[0029] The technical solutions of the present invention will now be described in detail with reference to the accompanying drawings of the embodiments.

[0030] like Figures 1-5 As shown, an electronic control structure for a nitrogen and oxygen sensor includes a housing 1, an external connector 2, a connector 3, a circuit board 4, and a rear cover 5. The housing 1 has two clearance openings, and housing flanges 13 are arranged around the outer side of each clearance opening. The bottom of the side wall of the housing 1 is surrounded by a housing groove 12.

[0031] The bottom of the external connector 2 is surrounded by a groove A25, which is engaged with a housing flange 13. A limiting platform A23 is provided in the middle of the bottom side of the external connector 2. The platform surface of the limiting platform A23 has a recess, and a terminal A24 is provided in the recess. Guide posts A21 and cylinders A22 are respectively provided on both sides of the limiting platform A23.

[0032] The bottom of the connector 3 is surrounded by a groove B35, which is engaged with the other housing flange 13. A limiting platform B33 is provided in the middle of the bottom side of the connector 3. The platform surface of the limiting platform B33 is recessed, and a terminal B34 is provided in the recess. Guide posts B31 and cylinders B32 are respectively provided on both sides of the limiting platform B33.

[0033] The rear cover 5 is provided with a rear cover flange 52 around its outer side, and the rear cover flange 52 engages with the housing groove 12 provided around the bottom of the side wall of the housing 1; the rear cover 5 extends upward at its end and is provided with a rear cover fastener 51, which is fastened to the side of the housing 1.

[0034] The guide post A21 and guide post B31 can be one or more.

[0035] When the cylinders A22 and B32 are assembled with the housing 1, they pass through the through hole of the housing 1, and the outer diameter of the cylinder head is increased to an umbrella shape by passing through the umbrella-shaped riveting part A221 and the umbrella-shaped riveting part B321 respectively, so that they cannot be separated from the through hole of the housing 1.

[0036] The limiting platform A23 and the limiting platform B33 are at the same height and are higher than the inner surface 11 of the housing. When the circuit board 4 is pressed in, they play a positioning and limiting role and make the circuit board 4 and the inner surface 11 of the housing have a certain distance.

[0037] When the groove A25 engages with one of its housing flanges 13, and the groove B35 engages with the other housing flange 13, the grooves A25 and B35...

[0038] Apply adhesive sealant to the surface.

[0039] The rear cover flange 52 is engaged with the housing groove 12 around the bottom of the side wall of the housing 1, and the adhesive sealant is applied on the housing groove 12.

[0040] The specific implementation is that first, each component is comprehensively inspected and cleaned to ensure no defects and clean surface. The external socket 2 and the connecting plug 3 are precisely engaged with the corresponding housing flange 13 on the housing 1 through the bottom groove A25 and the groove B35, respectively, and the adhesive is applied in the grooves to enhance the sealing. The cylindrical A22 and the cylindrical B32 are riveted into an umbrella-shaped structure after passing through the through hole of the housing 1, which not only realizes stable mechanical connection, but also guarantees the overall stability before the adhesive solidifies, meeting the demand for rapid production. When the circuit board 4 is installed, it is smoothly pressed along the guide column A21 and the guide column B31 of the external socket 2 and the connecting plug 3, ensuring correct connection with the terminal A24 and the terminal B34 and realizing signal transmission. At the same time, the limiting table A23 and the limiting table B33 play a key role in limiting the position of the circuit board 4, keeping a safe distance from the inner surface 11 of the housing, preventing short circuit, guaranteeing stable electrical performance, and ensuring consistent installation position of the circuit board 4 in each product, thereby improving product quality uniformity. When the rear cover 5 is installed, adhesive is applied to the flange 52, which is tightly engaged with the housing groove 12 at the bottom of the side wall of the housing 1, and then the rear cover catch 51 is firmly buckled on the side of the housing 1, further strengthening the overall sealing and blocking external impurities, protecting the internal precision components.

[0041] After assembly, professional detection equipment is used to simulate the actual working environment of the nitrogen oxygen sensor to comprehensively detect the cooperative operation effect of each component. The accuracy and stability of the monitoring data transmission are monitored to check whether the signal transmission between the external socket 2, the connecting plug 3 and the circuit board 4 is reliable under conditions such as vibration, temperature and humidity change; the overall structural sealing is checked to see whether the adhesive sealing part and the connection gap of each component effectively block external substances; the anti-shock performance is tested to evaluate whether the component connection is loose and the electrical connection is affected in the simulated vehicle driving vibration environment. If problems are found in the detection, it is necessary to investigate whether the problem is caused by improper component connection, ineffective adhesive sealing or other reasons, and timely adjustment and repair are made to ensure that the product meets the design standards and realizes the function of accurate detection and stable data transmission of the nitrogen oxygen sensor.

Claims

1. A nitrogen-oxygen sensor electric control structure, comprising a shell (1), an external socket (2), a connecting plug (3), a circuit board (4), a back cover (5), characterized in that, Two avoiding openings are arranged on the shell (1), and shell flanges (13) are arranged outside the avoiding openings; a shell groove (12) is arranged around the bottom of the side wall of the shell (1); A groove A (25) is arranged around the bottom of the external connector (2), and the groove A (25) is matched with one shell flange (13); a limiting table A (23) is arranged in the middle of the bottom side of the external connector (2), and the top surface of the limiting table A (23) is recessed, and a terminal A (24) is arranged in the recessed part; a guide column A (21) and a cylinder A (22) are arranged on the two sides of the limiting table A (23) respectively; A groove B (35) is arranged around the bottom of the connecting plug (3), and the groove B (35) is matched with another shell flange (13); a limiting table B (33) is arranged in the middle of the bottom side of the connecting plug (3), and the top surface of the limiting table B (33) is recessed, and a terminal B (34) is arranged in the recessed part; a guide column B (31) and a cylinder B (32) are arranged on the two sides of the limiting table B (33) respectively; A rear cover flange (52) is arranged around the outer side of the rear cover (5), and the rear cover flange (52) is matched with the shell groove (12) arranged around the bottom of the side wall of the shell (1); a rear cover buckle (51) is arranged on the end of the rear cover (5) and extends upward, and the rear cover buckle (51) is buckled on the side surface of the shell (1).

2. The electrically controlled structure of a NOx sensor according to claim 1, wherein The guide column A (21) and the guide column B (31) are one or more.

3. The electrically controlled structure of a NOx sensor according to claim 1, wherein The cylinder A (22) and the cylinder B (32) pass through the via hole of the shell (1) when assembled with the shell (1), and the cylinder head outer diameter is enlarged to an umbrella-shaped structure by penetrating the umbrella-shaped riveting part A (221) and the umbrella-shaped riveting part B (321) respectively, so that it cannot be separated from the via hole of the shell (1).

4. The electrically controlled structure of a NOx sensor according to claim 1, wherein The limiting table A (23) and the limiting table B (33) are consistent in height and higher than the inner surface (11) of the shell, and when the circuit board (4) is pressed in, the limiting table A (23) and the limiting table B (33) play a positioning and limiting role, and the circuit board (4) has a certain spacing with the inner surface (11) of the shell.

5. The electrochemical structure of claim 1, wherein, When the groove A (25) and the groove B (35) are matched with one shell flange (13) and another shell flange (13) respectively, a little adhesive sealant is applied on the groove A (25) and the groove B (35).

6. The electrochemical structure of claim 1, wherein, When the rear cover flange (52) is matched with the shell groove (12) arranged around the bottom of the side wall of the shell (1), a little adhesive sealant is applied on the shell groove (12).

7. The electrically controlled structure of a NOx sensor according to claim 1, wherein The limiting table A (23) and the terminal A (24) are an integral molding structure.

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