Automobile exhaust pressure sensor assembly

Abstract

The utility model discloses an automobile exhaust pressure sensor assembly, which comprises a plug, a shell, an electronic module, a first sealant, a second sealant, a third sealant, a sealing structure and a circuit protection chip, and is characterized in that a terminal assembly is arranged in the plug, and a first placement groove and a second placement groove are formed in the plug; the electronic module and the circuit protection chip are respectively arranged in the plug and are connected with the terminal assembly, a first sealant is smeared to seal the circuit protection chip and the electronic module in the plug, the sealing structure is arranged in the shell, the shell is provided with a test through hole coaxial with the sealing structure, and the test through hole is connected with the terminal assembly. A second sealant is smeared inside the plug and the shell, the plug and the shell are fixed in an inserted mode, a third sealant is smeared at the contact position of the plug and the outer portion of the shell, the sealing structure is located between the testing through hole and the electronic module, the electronic module is provided with an opening, and the opening enables a pressure chip of the electronic module to be exposed outside and faces the testing through hole; the structure is simple, assembling is convenient, and cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, in particular to an automobile exhaust pressure sensor component. Background Art

[0002] With the global demand for environmental protection and improvement of air quality, people are beginning to pay more and more attention to the adverse effects of automobile exhaust on the environment and human health, especially the pollution of air quality.

[0003] In this context, in order to control and reduce the emission of harmful substances, automobile manufacturers in various countries have begun to develop and introduce exhaust gas recirculation technology (EGR technology). This technology can realize the real-time numerical collection of automobile exhaust pressure through pressure sensors.

[0004] The electronic module of the existing automobile exhaust pressure sensor is divided into a pressure sensing part and a signal processing part, which are two separate parts. The structure contains many electronic parts (such as sensing capacitors, resistors, capacitors, signal processing chips), and is mostly soldered.

[0005] The problems with the above structure are: 1. The process is relatively complicated and requires increased production investment; 2. Since each additional process requires increased product manufacturing time, such a design is not only time-consuming and labor-intensive to manufacture, but also increases manufacturing costs.

[0006] It can be seen that providing an automobile exhaust pressure sensor assembly with a simple structure and low manufacturing cost is an urgent problem to be solved in the art. Utility Model Content

[0007] In view of the technical problems of the existing automobile exhaust pressure sensor components having complex structures and high manufacturing costs, the utility model aims to provide an automobile exhaust pressure sensor component with a simple overall structure, convenient assembly and low manufacturing cost.

[0008] In order to achieve the above-mentioned purpose, the automobile exhaust pressure sensor assembly provided by the utility model includes a plug, a housing, an electronic module, a first sealant, a second sealant, a third sealant, a sealing structure and a circuit protection chip.

[0009] A terminal assembly is arranged inside the plug, as well as a first placement groove and a second placement groove for accommodating an electronic module module and a circuit protection chip. The electronic module module and the circuit protection chip are respectively placed in the first placement groove and the second placement groove and are respectively connected to the terminal assembly. The circuit protection chip and the electronic module module are sealed in the plug by applying the first sealant. The sealing structure is placed in the shell. The shell is provided with a test through hole coaxially arranged with the sealing structure. The second sealant is applied to the inside of the plug and the shell and the plug and the shell are plugged and fixed. The third sealant is applied to the contact position between the plug and the outside of the shell. The sealing structure is located between the test through hole and the electronic module module and can seal the two. The electronic module module is provided with an opening. The opening exposes the pressure chip of the electronic module module to the outside and faces the test through hole so as to measure the pressure of the medium in the test through hole.

[0010] Further, the plug includes a coaxially distributed plug-in part, a first connecting part and a terminal assembly, the plug-in part is provided with a plug-in cavity, the first connecting part is provided with a connecting cavity, the connecting cavity is provided with a first placement groove and a second placement groove for placing an electronic module module and a circuit protection chip, the terminal assembly is arranged in the first plug-in cavity and extends into the connecting cavity and is connected to the electronic module module and the circuit protection chip;

[0011] The first placement groove is overlapped with the second placement groove, and the first placement groove covers the second placement groove and is located on a side of the second placement groove facing the outside.

[0012] Furthermore, the terminal assembly includes a plurality of embedded terminals, which are equidistantly arranged in the plug-in cavity and extend into the connecting cavity. The embedded terminal includes a first end located in the plug-in cavity and a second end extending outward from the first end into the first receiving groove. The terminal assembly also includes a plurality of connecting columns, which are inserted into the second receiving groove and extend toward the first end of the embedded terminal and are connected to the first end respectively.

[0013] Furthermore, the circuit protection chip includes a PCB board and a plurality of capacitors and a plurality of elastic conductive parts arranged on the PCB board. The PCB board is provided with a connecting hole corresponding to the connecting column. The circuit protection chip is placed as a whole in the second placement groove and the connecting hole is sleeved on the connecting column. The connecting hole is fixedly connected to the connecting column. One end of the elastic conductive part is arranged on the PCB board, and the other end is abutted against the outer shell.

[0014] Furthermore, the electronic module assembly includes a protective shell, a conductive sheet, a pressure chip and a signal processing chip, wherein the conductive sheet is arranged in the protective shell and has two ends extending outward to the outside respectively, one end extending outward to form a plurality of first connection ends corresponding to the second ends of the embedded terminals, and the other end extending outward to form a plurality of second connection ends for fixing with the plug;

[0015] The pressure chip and the signal processing chip are arranged on an end surface of the conductive sheet facing outward and correspond to the test through hole, and the two are bonded by wires. The pressure chip is electrically connected to the conductive sheet through the wires. The protective shell is arranged in the first placement groove and abuts against the sealing structure. The protective shell is provided with an opening corresponding to the position of the pressure chip, and the pressure chip is connected to the test through hole through the opening.

[0016] The opening is coated with protective glue, and the protective glue wraps the pressure chip, the lead wire, and the signal processing chip.

[0017] Furthermore, a plurality of annular protrusions are arranged on the end surface of the protective shell in contact with the first mounting groove, and the plurality of annular protrusions are distributed in concentric circles in sequence. The first mounting groove is provided with a plurality of annular grooves corresponding to the plurality of annular protrusions. By placing the annular protrusions in the annular grooves, the horizontal displacement of the protective shell can be limited.

[0018] Furthermore, the shell includes a coaxially distributed second connection part and a threaded connection end for connecting to the outside, a test through hole is provided on the threaded connection end, a placement cavity connected to the test through hole is provided in the second connection part, an annular placement groove is provided in the placement cavity with the test through hole as the center, and a sealing structure can be placed therein, the second connection part corresponds to the first connection part, and the second connection part can be plugged into the first connection part.

[0019] Furthermore, the sealing structure is a sealing ring, which is placed in an annular placement cavity. The sealing ring is pressed between the outer shell and the electronic module module. The two ends of the sealing ring are respectively abutted against the annular placement groove and the protective shell of the electronic module module, so as to seal the test through hole and the electronic module module.

[0020] Furthermore, an annular groove is provided at the contact end between the sealing structure and the protective shell, and the protective shell is provided with an annular protrusion corresponding to the annular groove.

[0021] Furthermore, the sealing structure is a sealant, and the sealant is coated in the annular placement groove. After the sealant is cured, it can seal the test through hole and the electronic module assembly.

[0022] The automobile exhaust pressure sensor assembly provided by the utility model integrates the pressure chip and the signal processing chip together, and the plug and the shell are fixed by plugging, so the overall structure is simple, the assembly is convenient, and the manufacturing cost is low;

[0023] By setting up a circuit protection chip, the pulse wave of the external conductor can be filtered, and the reliability and service life of the sensor assembly can be improved. The plug, the electronic module and the circuit protection chip are sealed with a first sealant, the shell and the plug are sealed with a sealing structure and a second sealant is applied between the two, and a third sealant is applied to the external gap between the plug and the shell. By using multiple sealants for bonding and sealing, the reliability of the exhaust pressure sensor assembly is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention is further described below in conjunction with the accompanying drawings and specific implementations.

[0025] Figure 1 A schematic diagram of the exploded structure of the automobile exhaust pressure sensor assembly provided by the utility model;

[0026] Figure 2 This is a schematic diagram of the structure of the plug in the automobile exhaust pressure sensor assembly provided by the utility model;

[0027] Figure 3 This is a schematic diagram of the structure of the plug in the automobile exhaust pressure sensor assembly provided by the utility model when it is connected with the electronic module module and the circuit protection chip;

[0028] Figure 4 A schematic diagram of the terminal assembly and the circuit protection chip in the automobile exhaust pressure sensor assembly provided by the utility model when they are connected in coordination;

[0029] Figure 5 This is an internal cross-sectional view of the electronic module assembly in the automobile exhaust pressure sensor assembly provided by the utility model;

[0030] Figure 6 The utility model is a cross-sectional view of the automobile exhaust pressure sensor assembly provided by the utility model.

[0031] Illustration Description:

[0032] Plug 100, housing 200, electronic module assembly 300, first sealant 400, second sealant 500, third sealant 600, sealing structure 700, circuit protection chip 800, second sealing structure 900;

[0033] Connecting part 110, connecting cavity 111, first connecting part 120, connecting cavity 121, first receiving groove 121a, second receiving groove 121b, annular groove 121c, terminal assembly 130, embedded terminal 131, first end 131a, second end 131b, connecting column 132, second connecting part 210, receiving cavity 211, annular receiving groove 212, threaded connecting end 220, test through hole 230, protective shell 310, annular protrusion 311, annular bump 312, conductive sheet 320, first connecting end 321, second connecting end 322, pressure chip 330, signal processing chip 340, lead 350, opening 360, annular groove 710, PCB board 810, capacitor 820, elastic conductive member 830, connecting hole 840. DETAILED DESCRIPTION

[0034] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below with reference to specific illustrations.

[0035] Embodiment 1:

[0036] See also Figure 1 , which is a schematic structural diagram of the automobile exhaust pressure sensor assembly provided by the utility model.

[0037] According to the figure, the automobile exhaust pressure sensor assembly provided by the utility model includes eight components: a plug 100, a housing 200, an electronic module assembly 300, a first sealant 400, a second sealant 500, a third sealant 600, a sealing structure 700, and a circuit protection chip 800.

[0038] The plug 100 and the housing 200 are the structural main body of the utility model, which are used to carry other components, and the two are connected together to form the protective housing of the utility model.

[0039] The plug 100 is provided with a terminal assembly 130 and a first placement groove 121a and a second placement groove 121b for accommodating the electronic module module 300 and the circuit protection chip 800. The electronic module module 300 and the circuit protection chip 800 are respectively placed in the first placement groove 121a and the second placement groove 121b and are respectively connected to the terminal assembly 130. The circuit protection chip 800 and the electronic module module 300 are sealed in the plug 100 by applying the first sealant 400.

[0040] The sealing structure 700 is arranged in the housing 200, and the housing 200 is provided with a testing through hole 230 coaxially arranged with the sealing structure 700;

[0041] The second sealant 500 is applied to the inside of the plug 100 and the shell 200 and the plug 100 and the shell 200 are plugged and fixed, and the third sealant 600 is applied to the contact position between the plug 100 and the shell 200 to seal the gap between the plug 100 and the shell 200;

[0042] The sealing structure 700 is located between the test through hole 230 and the electronic module module 300 for sealing the two. The electronic module module 300 is provided with an opening 360 which exposes the pressure chip 320 of the electronic module module 300 to the outside and faces the test through hole 230 to measure the pressure of the medium in the test through hole 230.

[0043] The automobile exhaust pressure sensor assembly provided by the utility model is connected to an external conductor through a terminal assembly 130 inside a plug 100, and is connected to an automobile exhaust pipe through a housing 200. A medium can enter through a test through hole 230 inside the housing 200 and impact a pressure chip 320, and the pressure chip 320 tests the pressure of the medium, and then transmits the medium to an external conductor through the terminal assembly 130 after being processed by the electronic module module 300;

[0044] In addition, a circuit protection chip 800 is further provided in the present solution to protect the electronic module assembly 300. In actual application, when the terminal assembly 130 is connected to an external conductor, the external conductor may emit a pulse wave, which may damage the electronic module assembly 300. The pulse wave can be filtered by the circuit protection chip 800, thereby greatly improving the overall reliability of the sensor assembly.

[0045] Specifically, Figure 2 , Figure 4 The plug 100 includes a coaxially distributed connector 110, a first connecting part 120 and a terminal assembly 130. The connector 110 is provided with a connector cavity 111, the first connecting part 120 is provided with a connecting cavity 121, the connecting cavity 121 is provided with a first placement groove 121a and a second placement groove 121b for placing the electronic module module 300 and the circuit protection chip 800, the terminal assembly 130 is arranged in the first connector cavity 111 and extends into the connecting cavity 121 and is connected to the electronic module module 300 and the circuit protection chip 800.

[0046] In order to improve space utilization and reduce the volume of the plug 100, the first placement groove 121a and the second placement groove 121b are overlapped, and the first placement groove 121a covers the second placement groove 121b. The first placement groove 121a is located on the side of the second placement groove 121b facing the outside.

[0047] In actual application, the external conductive part is connected to the plug-in part 110, and the external conductive part is inserted into the plug-in cavity 111 and electrically connected to the terminal assembly 130. The external conductive part can obtain the measured pressure data of the electronic module module 300 through the terminal assembly 130.

[0048] The terminal assembly 130 includes a plurality of embedded terminals 131, which are arranged in the plug cavity 111 in sequence and at equal intervals and extend into the connection cavity 121. The embedded terminal 131 includes a first end 131a located in the plug cavity 111 and a second end 131b extending outward from the first end 131a to the first placement groove 121a. The terminal assembly 130 also includes a plurality of connecting posts 132, which are inserted into the second placement groove 121b and extend toward the first end 131a of the embedded terminal 131 and are connected to the first end 131a.

[0049] The first end 131a is located in the connector cavity 111 for connecting to an external conductor, and the second end 131b and the connecting column 132 are respectively located in the first placement groove 121a and the second placement groove 121b for connecting to the electronic module assembly 300 and the circuit protection chip 800.

[0050] This solution does not limit the number of embedded terminals 131 and connecting columns 132, which can be determined according to actual conditions. For example, this example preferably uses three embedded terminals 131 and two connecting columns 132, and the two connecting columns 132 are connected to any two of the embedded terminals 131.

[0051] like Figure 4 The circuit protection chip 800 is a capacitor chip, which includes a PCB board 810 and a plurality of capacitors 820 and a plurality of elastic conductive members 830 arranged on the PCB board 810. The PCB board 810 is provided with a connecting hole 840 corresponding to the connecting column 132. The circuit protection chip 800 is arranged as a whole in the second placement groove 121b and the connecting hole 840 is sleeved on the connecting column 132. The connecting hole 840 is fixedly connected to the connecting column 132. The present scheme preferably adopts a soldering method for fixed connection. One end of the elastic conductive member 830 is arranged on the PCB board 810, and the other end is abutted against the housing 200.

[0052] This solution does not limit the number and arrangement of capacitors 820 and elastic conductive members 830, which can be determined according to actual needs. For example, this example preferably uses two capacitors 820 and two elastic conductive members 830, and the two capacitors are preferably symmetrically arranged on both sides of the PCB board 810, and the two elastic conductive members 830 are preferably symmetrically arranged on the outward side of the capacitor 820.

[0053] The circuit protection chip 800 of such a structure is used to protect the electronic module module 300. In actual application, it is electrically connected to the external conductor through the embedded terminal 131 inside the plug 100. When the external conductor emits a pulse (voltage), the pulse can be transmitted to the capacitor 820 on the PCB board 810 through the embedded terminal 131. The capacitor 820 is transmitted to the housing 200 through the elastic conductive part 830 to filter the pulse. In this way, the pulse will not enter the electronic module module 300 from the embedded terminal 131, thereby playing a protective role.

[0054] like Figure 3 and Figure 6 The electronic module module 300 includes a protective shell 310, a conductive sheet 320, a pressure chip 330 and a signal processing chip 340. The conductive sheet 320 is arranged in the protective shell 310 and its two ends extend outward to the outside respectively. One end extends outward to form a plurality of first connection ends 321 corresponding to the second end 131b of the embedded terminal 131, which are used to connect with the second end 131b of the embedded terminal 131, and the other end extends outward to form a plurality of second connection ends 322 for fixing with the plug 100;

[0055] The pressure chip 330 and the signal processing chip 340 are arranged on an end surface of the conductive sheet 320 facing outward and corresponding to the test through hole 230, and the two are bonded by a lead 350, and the pressure chip 330 is electrically connected to the conductive sheet 320 through the lead 350, and the protective shell 310 is arranged in the first placement groove 121a and abuts against the sealing structure 700, and the protective shell 310 is provided with an opening 360 corresponding to the position of the pressure chip 330, and the pressure chip 330 is connected to the test through hole 230 through the opening 360;

[0056] The opening 360 is coated with protective glue, which wraps the pressure chip 330, the lead 350, and the signal processing chip 340. The protective glue is preferably made of fluorosilicone, which can protect the pressure chip 330, the lead 350, and the signal processing chip 340. At the same time, the silicone can be used as a medium to transmit the pressure of the gas to be tested without affecting the pressure test of the pressure chip 330.

[0057] In this example, the lead wire 350 can be a gold wire, an aluminum wire, a copper wire, etc. according to different requirements.

[0058] The first connection end 321 of the conductive sheet 230 is preferably connected to the embedded terminal 131 by laser welding, the second connection end 322 of the conductive sheet 230 is preferably connected to the connector 100 by hot melting, and the protective shell 310 is preferably a plastic shell.

[0059] like Figure 3The electronic module module 300 and the circuit protection chip 800 of such a structure are respectively fixedly placed in the first placement groove 121a and the second placement groove 121b and cooperate with the first sealant 400. By applying the first sealant 400, the electronic module module 300 and the circuit protection chip 800 are sealed in the connecting cavity 121. The first sealant 400 is used to seal and prevent the metal parts of the electronic module module 300 and the circuit protection chip 800 from corrosion and oxidation.

[0060] In order to further improve the stability and reliability of the electronic module assembly 300 placed in the connecting cavity 121, the present solution is provided with a limiting structure in cooperation with the protective shell 310 and the connecting cavity 121, and a plurality of annular protrusions 311 are arranged on the end surface of the protective shell 310 in contact with the first mounting groove 121a, and the plurality of annular protrusions 311 are distributed in concentric circles in sequence, and the first mounting groove 121a is provided with a plurality of annular grooves 121c corresponding to the plurality of annular protrusions 311. By placing the annular protrusions 311 in the annular grooves 121c, the horizontal displacement of the protective shell 310 can be limited to improve the structural stability and reliability.

[0061] Specifically, Figure 1 The housing 200 includes a coaxially distributed second connection portion 210 and a threaded connection end 220 for connecting to the outside, a test through hole 230 is provided on the threaded connection end 220, a placement cavity 211 communicating with the test through hole 230 is provided in the second connection portion 210, an annular placement groove 212 is provided in the placement cavity 211 with the test through hole 230 as the center, and the sealing structure 700 can be placed therein, the second connection portion 210 corresponds to the first connection portion 120, and the second connection portion 210 can be plugged with the first connection portion 120;

[0062] In actual application, by aligning the first connection part 120 with the second connection part 210 and inserting it, the second connection part 210 is acted upon by a force, so that the second connection part 210 expands and deforms outwards, and the second connection part 210 is fixed to the first connection part 120 due to the elastic force.

[0063] The first connection part 120 and the second connection part 210 of such a structure cooperate with the third sealant 600. The third sealant 600 is applied to the external contact position of the first connection part 120 and the second connection part 210 to seal the gap between the two to further improve the sealing performance.

[0064] The shell 200 of such a structure is connected with the sealing structure 700, which is a sealing ring, which is placed in the annular placement cavity 211. When the shell 200 is connected with the plug 100, the sealing ring is pressed between the shell 200 and the electronic module module 300, and the two ends of the sealing ring are respectively abutted against the annular placement groove 211 and the protective shell 310 of the electronic module module 200, so as to close the test through hole 230 and the electronic module module 200.

[0065] In order to further improve the connection reliability and stability between the sealing structure 700 and the protective shell 310, an annular groove 710 is provided at the contact end of the sealing structure 700 and the protective shell 310, and the protective shell 310 is provided with an annular protrusion 312 corresponding to the annular groove 710. By placing the annular protrusion 312 in the annular groove 710, the horizontal displacement between the protective shell 310 and the sealing structure 700 can be further limited, and the sealing performance of the protective shell 310 and the test through hole 230 can be improved.

[0066] The second sealant 500 is applied to the placement cavity 211 of the housing 200 and the connection cavity 121 of the plug 100 , and after curing, the housing 200 and the inside of the plug 100 can be bonded and sealed.

[0067] In this solution, the second sealant 500 and the third sealant 600 cooperate to form a double sealing structure, thereby greatly improving the reliability of the automobile exhaust pressure sensor assembly.

[0068] The threaded connection end 220 is provided with a groove in which the second sealing structure 900 can be placed. When the threaded connection end 220 is connected to the outside, the second sealing structure 900 can abut against the threaded connection end 220 and the external connection part respectively to seal the two.

[0069] During assembly, the circuit protection chip 800 is first placed in the first placement groove 121a, and the circuit protection chip 800 is inserted into the connection column 132 through the connection hole 840 and preferably connected by soldering. Then, the electronic module assembly 300 is installed in the second placement groove 121b, and the electronic module assembly 300 is preferably fixed to the plug 100 by hot melting through the second connection end 322, and the first connection end 321 is preferably welded to the embedded terminal assembly 130 by laser welding. Finally, the first sealant 400 is applied and cured to seal the electronic module assembly 300 and the circuit protection chip 800 in the plug 100.

[0070] The sealing structure 700 is installed in the housing cavity 211 of the second connecting portion 210 in the housing 200 and the second sealing adhesive 500 is applied inside the housing 200 and the plug 100, and then assembled with the cured plug 100, and the housing 200 is pressed to deform the housing 200 to fix the plug 100 firmly, and the third sealing adhesive 600 is applied at the contact position between the connector 100 and the outside of the housing 200, and finally the sealing structure 800 is installed;

[0071] In actual application, by connecting the threaded connection end 220 of the housing 200 to the exhaust pipe of the automobile, and connecting the first connector end 110 of the plug 100 to the external conductive member, the medium can enter through the air inlet end of the test through hole 230 and contact the protective glue at the opening 360, and the pressure sensing surface of the pressure chip 320 is subjected to pressure for pressure measurement; when the protective shell 310 and the sealing structure 700 are sealed and abutted, the medium will not enter the connecting cavity 121, thereby achieving medium isolation and corrosion resistance; by closing the pressure measuring through hole 230, the overall structure is simple, and it is convenient for processing and assembly;

[0072] The pressure chip 330 transmits the measured pressure information data to the signal processing chip 340 through the conductive sheet 320 for processing. The signal processing chip 340 transmits the processed data to the external conductive member through the conductive sheet 320, the first connection end 321, and the embedded terminal 230 in sequence.

[0073] Embodiment 2:

[0074] This embodiment is based on the embodiment 1, and the structure of the sealing structure 700 is changed. The other structures are the same and will not be described in detail here.

[0075] In order to further reduce costs, the sealing structure 700 of this embodiment adopts sealant. By applying the sealant to the annular mounting groove 211, the sealant can seal the test through hole 230 and the electronic module assembly 300 after curing, thereby preventing the exhaust gas in the test through hole 230 from leaking into the plug 100.

[0076] In this example, a sealant is used to replace the sealing ring in Example 1. The sealant can achieve the same function as the sealing ring and can further reduce the production cost.

[0077] The present solution does not limit the structure of the sealing structure 700, which can be determined according to actual needs. The sealing structure 700 can also adopt other solutions as long as it meets the above-mentioned equivalent functions.

[0078] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. An automobile exhaust pressure sensor assembly, characterized in that: It includes a plug, a housing, an electronic module assembly, a first sealant, a second sealant, a third sealant, a sealing structure and a circuit protection chip. A terminal assembly is arranged inside the plug, as well as a first placement groove and a second placement groove for accommodating an electronic module module and a circuit protection chip. The electronic module module and the circuit protection chip are respectively placed in the first placement groove and the second placement groove and are respectively connected to the terminal assembly. The circuit protection chip and the electronic module module are sealed in the plug by applying the first sealant. The sealing structure is placed in the shell. The shell is provided with a test through hole coaxially arranged with the sealing structure. The second sealant is applied to the inside of the plug and the shell and the plug and the shell are plugged and fixed. The third sealant is applied to the contact position between the plug and the outside of the shell. The sealing structure is located between the test through hole and the electronic module module and can seal the two. The electronic module module is provided with an opening. The opening exposes the pressure chip of the electronic module module to the outside and faces the test through hole so as to measure the pressure of the medium in the test through hole.

2. The automobile exhaust pressure sensor assembly according to claim 1, characterized in that: The plug includes a coaxially distributed plug-in part, a first connecting part and a terminal assembly, the plug-in part is provided with a plug-in cavity, the first connecting part is provided with a connecting cavity, the connecting cavity is provided with a first placement groove and a second placement groove for placing an electronic module module and a circuit protection chip, the terminal assembly is arranged in the first plug-in cavity and extends into the connecting cavity and is connected to the electronic module module and the circuit protection chip; The first placement groove is overlapped with the second placement groove, and the first placement groove covers the second placement groove and is located on a side of the second placement groove facing the outside.

3. The automobile exhaust pressure sensor assembly according to claim 2, characterized in that: The terminal assembly includes a plurality of embedded terminals, which are equidistantly arranged in the plug-in cavity and extend into the connecting cavity. The embedded terminal includes a first end located in the plug-in cavity and a second end extending outward from the first end into the first receiving groove. The terminal assembly also includes a plurality of connecting columns, which are inserted into the second receiving groove and extend toward the first end of the embedded terminal and are connected to the first end respectively.

4. The automobile exhaust pressure sensor assembly according to claim 1, characterized in that: The circuit protection chip includes a PCB board and a plurality of capacitors and a plurality of elastic conductive parts arranged on the PCB board. The PCB board is provided with a connecting hole corresponding to the connecting column. The circuit protection chip is arranged as a whole in the second placement groove and the connecting hole is sleeved on the connecting column. The connecting hole is fixedly connected to the connecting column. One end of the elastic conductive part is arranged on the PCB board, and the other end is abutted against the shell.

5. The automobile exhaust pressure sensor assembly according to claim 1, characterized in that: The electronic module module includes a protective shell, a conductive sheet, a pressure chip and a signal processing chip. The conductive sheet is arranged in the protective shell and has two ends extending outward to the outside respectively, one end extending outward to form a plurality of first connection ends corresponding to the second ends of the embedded terminals, and the other end extending outward to form a plurality of second connection ends for fixing with the plug; The pressure chip and the signal processing chip are arranged on an end surface of the conductive sheet facing outward and correspond to the test through hole, and the two are bonded by wires. The pressure chip is electrically connected to the conductive sheet through the wires. The protective shell is arranged in the first placement groove and abuts against the sealing structure. The protective shell is provided with an opening corresponding to the position of the pressure chip, and the pressure chip is connected to the test through hole through the opening. The opening is coated with protective glue, and the protective glue wraps the pressure chip, the lead wire, and the signal processing chip.

6. The automobile exhaust pressure sensor assembly according to claim 5, characterized in that: A plurality of annular protrusions are arranged on the end surface of the protective shell in contact with the first mounting groove, and the plurality of annular protrusions are distributed in concentric circles in sequence. The first mounting groove is provided with a plurality of annular grooves corresponding to the plurality of annular protrusions. By placing the annular protrusions in the annular grooves, the horizontal displacement of the protective shell can be limited.

7. The automobile exhaust pressure sensor assembly according to claim 1, characterized in that: The shell includes a coaxially distributed second connection part and a threaded connection end for connecting to the outside, a test through hole is provided on the threaded connection end, a placement cavity connected to the test through hole is provided in the second connection part, an annular placement groove is provided in the placement cavity with the test through hole as the center, and a sealing structure can be placed therein, the second connection part corresponds to the first connection part, and the second connection part can be plugged into the first connection part.

8. The automobile exhaust pressure sensor assembly according to claim 7, characterized in that: The sealing structure is a sealing ring, which is placed in the annular placement cavity. The sealing ring is pressed between the shell and the electronic module module. The two ends of the sealing ring are respectively abutted against the annular placement groove and the protective shell of the electronic module module, which can seal the test through hole and the electronic module module.

9. The automobile exhaust pressure sensor assembly according to claim 1, characterized in that: The contact end between the sealing structure and the protective shell is provided with an annular groove, and the protective shell is provided with an annular protrusion corresponding to the annular groove.

10. The automobile exhaust pressure sensor assembly according to claim 8, characterized in that: The sealing structure is a sealant, which is coated in the annular placement groove. After the sealant is cured, it can seal the test through hole and the electronic module assembly.

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