Domain control host of double-layer PCBA (Printed Circuit Board Assembly) control panel

Abstract

The invention relates to the technical field of automotive electronics, in particular to a domain control host of a double-layer PCBA (printed circuit board assembly) control panel, which comprises a square shell provided with a lower step surface and an upper step surface; the lower step surface and the upper step surface carry out Z-direction positioning on the two PCBA control panels; two positioning cylinders are arranged at opposite angles of a bottom plate of the square shell; the two positioning cylinders and the two positioning round holes are used for carrying out coarse positioning on the two PCBA control panels in the X direction and the Y direction; the two PCBA control boards are provided with positioning gaps at the corresponding positions of the positioning columns; the positioning columns and the positioning notches are used for precisely positioning the two PCBA control panels in the X direction and the Y direction; through rough positioning and fine positioning, the X-direction positioning precision and the Y-direction positioning precision meet the set requirements. According to the domain control host, the two PCBA control panels are installed and positioned by adopting the same reference, stepped installation is achieved, and the heat dissipation effect and the installation precision are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile electronics, and in particular to a domain control host of a double-layer PCBA control board. Background Art

[0002] With the development of intelligent driving, more and more functions are added to the car cockpit, so various control hosts are needed, such as multimedia control host, 360-degree surround control host, fatigue monitoring control host, etc., to realize corresponding functions. Each control host contains a separate electronic controller (also known as ECU, Electronic Control Unit) for control, and each control host communicates through a wiring harness to realize the corresponding function. Specifically, each control host is equipped with a single-layer PCBA (Printed Circuit Board Assembly) control board through a shell structure, and the electronic controller is installed on the PCBA control board.

[0003] Since each control host is controlled by a separate and decentralized electronic controller, it is necessary to produce corresponding molds for multiple control hosts, which is costly, and requires more wiring harnesses to achieve mutual communication between them. The wiring harness layout on the vehicle is also relatively complicated, and upgrades and maintenance also need to be carried out separately, which is inconvenient to maintain. Therefore, technicians in this field thought of integrating several electronic controllers into a single-layer PCBA control board to realize the functions of several original independent control hosts and form a domain control host. However, in the process of developing and manufacturing single-layer PCBA control boards, technicians in this field found that the domain control host of the single-layer PCBA control board occupied too large an area, and then further developed a domain control host containing a double-layer PCBA control board.

[0004] In the related art, the domain control host of Chinese patent CN218103703U has a double-layer PCBA control board, which first sets a plate-shaped intermediate shell, and then arranges two PCBA control boards on both sides of the intermediate shell, so as to realize a stacked arrangement of two layers of PCBA control boards, reduce the area occupied by the PCBA control boards, and thus reduce the installation area occupied by the domain control host.

[0005] However, the above domain control host has the following defects:

[0006] ① The two PCBA control boards are arranged close to the middle housing. The heat dissipation effect in the area between the two PCBA control boards is extremely poor, which can easily cause excessive temperature and cause failure of the electronic components on the PCBA control boards;

[0007] ② The two PCBA control boards are connected by a board-to-board connector. During installation, the two halves of the board-to-board connector are first connected to the two PCBA control boards respectively, and then aligned and connected. In the above-mentioned domain control host, an avoidance hole for passing the board-to-board connector is opened on the middle shell. First, a set of references (i.e., the positioning columns on one side) is used to install the PCBA control board on one side on the middle shell, and then another set of references (i.e., the positioning columns on the other side) is used to install the PCBA control board on the other side on the middle shell, and the two halves of the board-to-board connector are docked at the avoidance holes. During the docking process, since two sets of references are used in advance to align the two PCBA control boards, installation errors are easily caused, resulting in the two halves of the board-to-board connector being unable to dock and connect normally or poor contact after docking. This is an unacceptable defect for board-to-board connectors that require very high installation accuracy. Summary of the invention

[0008] The present application provides a domain control host of a double-layer PCBA control board, which uses the same reference to install and position two PCBA control boards, realizes staged installation, and improves heat dissipation effect and installation accuracy.

[0009] The embodiment of the present application provides a domain control host of a double-layer PCBA control board, a square shell, and a lower step surface and an upper step surface spaced up and down are formed by its own structure; the lower step surface and the upper step surface are used to position the two PCBA control boards in the Z direction; two positioning cylinders are arranged diagonally on the bottom plate of the square shell; at least three positioning columns are arranged on both sides of the bottom plate of the square shell along the Y direction;

[0010] Two PCBA control boards are connected through a board-to-board connector; two positioning circular holes are set diagonally on the two PCBA control boards; and two positioning circular columns and two positioning circular holes perform rough positioning on the two PCBA control boards in the X and Y directions; positioning notches are set at corresponding positions of each positioning column on the two PCBA control boards; the positioning columns and positioning notches perform fine positioning on the two PCBA control boards in the X and Y directions; the rough positioning and fine positioning ensure that the positioning accuracy in the X and Y directions meets the set requirements.

[0011] On the basis of the above technical solution, in one embodiment, the board-to-board connector adopts a floating connector; the lower step surface and the upper step surface cooperate with each other, and the installation error of the actual height of the lower step surface and the upper step surface relative to the design height falls within the floating range of the floating connector in the height direction; the coarse positioning and the fine positioning cooperate with each other, so that the installation errors of the two PCBA control boards in the X and Y directions fall within the floating range of the floating connector in the X and Y directions.

[0012] On the basis of the above technical solution, in one embodiment, the two positioning cylinders are respectively a main positioning cylinder and an auxiliary positioning cylinder; the two positioning circular holes are respectively a main positioning circular hole and an auxiliary positioning circular hole; the fitting clearance between the main positioning cylinder and the main positioning circular hole is smaller than the fitting clearance between the auxiliary positioning cylinder and the auxiliary positioning circular hole, and the diameter of the auxiliary positioning circular hole 42 is larger than the diameter of the auxiliary positioning cylinder.

[0013] On the basis of the above technical solution, in one embodiment, the two PCBA control boards are respectively an upper PCBA control board and a lower PCBA control board; the positioning columns are divided into upper PCBA positioning columns and lower PCBA positioning columns, and each PCBA control board is provided with corresponding positioning notches for all positioning columns to pass through; at least one positioning notch on one side of the upper PCBA control board matches the upper PCBA positioning column, at least two positioning notches on the other side match the upper PCBA positioning column, and the remaining positioning notches are used to allow margin to avoid all lower PCBA positioning columns; at least one positioning notch on one side of the lower PCBA control board matches the lower PCBA positioning column, at least two positioning notches on the other side match the lower PCBA positioning column, and the remaining positioning notches are used to allow margin to avoid all upper PCBA control boards.

[0014] Based on the above technical solution, in one embodiment, a short support is arranged near the bottom of each positioning column, and all the short supports form a lower step surface; a long support is arranged on each of the four side walls of the square shell, and all the long supports form an upper step surface.

[0015] On the basis of the above technical solution, in one embodiment, the domain control host further includes an axial flow fan, which is fixedly arranged above the top plate of the square shell; the airflow of the axial flow fan directly blows the top plate setting area, and the upper PCBA control board at the corresponding position of the setting area is provided with the functional element with the highest heating power, and the element with the highest heating power is in contact with the top plate through the heat dissipation boss.

[0016] Based on the above technical solution, in one embodiment, the square shell includes an upper cover, a connector back plate, and a middle frame with a top surface and a side opening, and the connector back plate and the upper cover are both detachably fixed to the middle frame by screws; the middle frame is installed on the entire vehicle through a mounting bracket; the axial fan is arranged on the upper cover, and the top surface of the upper cover is also arranged as sheet-like heat dissipation ribs.

[0017] Based on the above technical solution, in one embodiment, the domain control host further includes multiple external connectors, and the external connectors are connected to two PCBA control boards through signal lines; the connector backplane opens corresponding holes as needed and is used to install external connectors.

[0018] On the basis of the above technical solution, in one embodiment, the two PCBA control boards are each provided with a plurality of chips acting as electronic controllers and other functional components, and a plurality of heat dissipation bosses are provided at corresponding positions of the upper cover and the middle frame bottom plate;

[0019] The heat dissipation boss and the chip are filled with a heat-conducting medium, and the heat-conducting medium is a heat-conducting gel or a heat-conducting silicone pad; the chip or other functional elements are respectively supported on the bottom plate of the upper cover or the middle frame through the heat dissipation boss and the heat-conducting medium.

[0020] Based on the above technical solution, in one embodiment, the fan wiring harness of the axial fan passes through the upper cover from top to bottom and is connected to the internal connector arranged on the upper PCBA control board; a wiring harness blocking cover is arranged at the position where the fan wiring harness passes through the upper cover for connection communication.

[0021] The beneficial effects brought by the technical solution provided by the embodiment of the present application include at least:

[0022] 1. The domain control host of the double-layer PCBA control board of the present application uses a combination of a lower step surface and an upper step surface for Z-direction positioning, so that the two PCBA control boards are arranged in steps at intervals, and the space between the two PCBA control boards is hollowed out without fillers, which improves the heat dissipation effect and has good heat dissipation effect; at the same time, two positioning cylinders and two positioning circular holes are used for rough positioning in X and Y directions, and the positioning columns and positioning notches are used for fine positioning in X and Y directions. The two PCBA control boards are positioned using the same positioning cylinder, and the same reference is used to install and position the two PCBA control boards. Compared with the two sets of references in the traditional solution, the positioning accuracy is higher and the error is smaller; the coarse positioning and fine positioning cooperate with each other to ensure the installation accuracy of the two PCBA control boards, so that the two half-board-to-board connectors can be well docked, the installation accuracy is improved, and the problem that the two half-board-to-board connectors in the traditional technical solution cannot be normally docked or have poor contact after docking is solved.

[0023] 2. The domain control host of the double-layer PCBA control board of the present application adopts a floating connector for the board-to-board connector, which can absorb the errors caused by manufacturing and installation to a certain extent; the lower step surface and the upper step surface cooperate with each other, and the installation error of the actual height of the lower step surface and the upper step surface relative to the design height is within the floating range of the floating connector in the height direction; the coarse positioning and the fine positioning cooperate with each other, so that the installation errors of the two PCBA control boards in the X and Y directions fall within the floating range of the floating connector in the X and Y directions, which can further improve the installation accuracy and ensure that the board-to-board connector is well connected.

[0024] 3. The domain control host of the double-layer PCBA control board of the present application adopts two PCBA control boards and a shell, and the external connectors are uniformly set on the connector backplane. It only needs to change the number of openings on the connector backplane, and there is no need to re-open multiple sets of molds to meet different configuration requirements, which greatly reduces the mold cost and development cycle.

[0025] 4. In the domain control host of the double-layer PCBA control board of the present application, the two PCBA control boards are arranged at an interval. Compared with the traditional technical solution, the high temperature will not be stuffy in the two PCBA control boards; at the same time, each chip or other functional element is respectively supported by the heat dissipation boss and the heat conductive medium against the bottom plate of the upper cover or the middle frame for contact heat dissipation, and the heat can be quickly diffused; further, the axial flow fan is used to blow air, and sheet-shaped heat dissipation ribs are added, so that the heat dissipation effect of the entire domain control host is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 A schematic diagram of the structure of a domain control host provided in an embodiment of the present application;

[0028] Figure 2 A schematic diagram of an exploded view of a domain control host provided in an embodiment of the present application;

[0029] Figure 3 A schematic diagram of another direction of an exploded view of a domain control host provided in an embodiment of the present application;

[0030] Figure 4 A schematic top view of the positional relationship between the positioning circular holes and positioning notches of the lower PCBA control board and the positioning posts provided in the embodiment of the present application;

[0031] Figure 5 A schematic diagram of an upper cover provided in an embodiment of the present application;

[0032] Figure 6 A schematic diagram of partial contact connection between the upper PCBA control board and the upper cover provided in an embodiment of the present application;

[0033] In the figure: 100, domain control host;

[0034] 1. Screws; 2. Axial flow fan; 3. Wire harness plug cover; 4. Fan wire harness; 5. Upper cover;

[0035] 6. Upper PCBA control board; 7. Lower PCBA control board; 8. Middle frame; 9. Mounting bracket; 10. Connector backplane; 11. Internal antenna; 12. External connector; 13. Board-to-board connector; 14. Heat dissipation boss; 15. Heat conducting medium; 16. Chip; 17. Sheet heat dissipation ribs;

[0036] 21. Lower step surface; 22. Upper step surface;

[0037] 31. Lower PCBA positioning column; 32. Upper PCBA positioning column;

[0038] 41. Main positioning circular hole; 42. Auxiliary positioning circular hole; 43. Screw mounting hole. DETAILED DESCRIPTION

[0039] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0040] The embodiment of the present application provides a domain control host of a double-layer PCBA control board, which uses the same reference to install and position two PCBA control boards, has high positioning accuracy, improves installation accuracy, and facilitates alignment and docking of board-to-board connectors; and the two PCBA control boards are installed in stages, and the space between the two PCBA control boards is hollowed out without any physical structure, which improves the heat dissipation effect and prevents the situation where heat is stuffy between the two PCBA control boards and is difficult to dissipate.

[0041] like Figures 1 to 3 As shown, the present application discloses an embodiment of a domain control host of a double-layer PCBA control board, including two PCBA control boards and a board-to-board connector 13 .

[0042] The domain control host 100 also includes a square shell, which accommodates two PCBA control boards and a board-to-board connector 13. The square shell forms a lower step surface 21 and an upper step surface 22 with a set distance between the upper and lower parts through its own side structure. The lower step surface 21 and the upper step surface 22 are both horizontal and have a set distance between the upper and lower parts. The lower step surface 21 and the upper step surface 22 perform Z-direction positioning for the two PCBA control boards. The lower step surface 21 and the upper step surface 22 allow the two PCBA control boards to be arranged in steps at intervals, and the space between the two PCBA control boards is hollowed out without fillers, and the heat dissipation effect is good. Specifically, the lower step surface is formed by a number of short support blocks, and the upper step surface is formed by a number of long support blocks.

[0043] Two positioning cylinders are set diagonally on the bottom plate of the square housing, and the positioning cylinders are perpendicular to the bottom plate. Two positioning holes are set diagonally at the corresponding positions of the two PCBA control boards. The two positioning cylinders and the two positioning holes perform rough positioning of the two PCBA control boards in the X and Y directions.

[0044] At least three positioning columns are respectively arranged on both sides of the bottom plate of the square housing along the Y direction, and positioning notches are arranged at the corresponding positions of each positioning column on the two PCBA control boards. The positioning columns and positioning notches perform precise positioning of the two PCBA control boards in the X and Y directions. Rough positioning and precise positioning make the positioning accuracy in the X and Y directions meet the set requirements; meeting the set requirements means that the positioning accuracy is less than the allowable installation error set in advance.

[0045] Among them, when the board-to-board connector 13 is docked, the X-direction and Y-direction positioning accuracy requirements are extremely high, and the Z-direction positioning accuracy is slightly weaker than the X-direction and Y-direction positioning accuracy, and the Z-direction positioning accuracy is relatively easy to achieve. Relatively speaking, the X-direction and Y-direction accuracy are more difficult to guarantee, and a slight misalignment in the X-direction and Y-direction will cause a poor contact connection problem. Therefore, after rough positioning and fine positioning, the installation accuracy of the two PCBA control boards is guaranteed, so that the two halves of the board-to-board connector can be well docked.

[0046] The domain control host of the double-layer PCBA control board of the present application, the lower step surface 21 and the upper step surface 22 are combined for Z-direction positioning, so that the two PCBA control boards are arranged in steps at intervals, and the space between the two PCBA control boards is hollowed out without fillers, which improves the heat dissipation effect and has a good heat dissipation effect;

[0047] At the same time, two positioning cylinders and two positioning holes are used for rough positioning in X and Y directions, and the positioning columns and positioning notches are used for fine positioning in X and Y directions. The two PCBA control boards are positioned using the same positioning cylinder, and the same reference is used to install and position the two PCBA control boards. Compared with the two sets of references in the traditional solution, the positioning accuracy is higher and the error is smaller. The rough positioning and fine positioning cooperate with each other to ensure the installation accuracy of the two PCBA control boards, so that the two halves of the board-to-board connector can be well docked, which improves the installation accuracy and solves the problem that the two halves of the board-to-board connector cannot be docked normally or have poor contact after docking in the traditional technical solution.

[0048] In one embodiment, the board-to-board connector 13 is a floating connector. The floating connector has a certain floating margin, which can absorb errors caused by manufacturing and installation to a certain extent.

[0049] The lower step surface 21 and the upper step surface 22 cooperate with each other, and the installation error of the actual height of the lower step surface 21 and the upper step surface 22 relative to the design height falls within the floating range of the floating connector in the height direction. The coarse positioning and the fine positioning cooperate with each other, so that the installation error of the two PCBA control boards in the X and Y directions falls within the floating range of the floating connector in the X and Y directions.

[0050] Preferably, the floating range of the floating connector in the height direction is plus or minus 0.8 mm, and the floating range of the floating connector in the X and Y directions is plus or minus 0.5 mm. In one example, the actual height of the lower step surface 21 and the upper step surface 22 has an accuracy error of +0.5 mm relative to the design height, and the installation error of the two PCBA control boards in the X and Y directions is -0.3 mm.

[0051] In the domain control host of the double-layer PCBA control board of the present application, the board-to-board connector 13 adopts a floating connector, which can absorb the errors caused by manufacturing and installation to a certain extent; the lower step surface 21 and the upper step surface 22 cooperate with each other, and the installation error of the actual height of the lower step surface 21 and the upper step surface 22 relative to the design height is within the floating range of the floating connector in the height direction; the coarse positioning and the fine positioning cooperate with each other, so that the installation errors of the two PCBA control boards in the X and Y directions fall within the floating range of the floating connector in the X and Y directions, which can further improve the installation accuracy and ensure that the board-to-board connector is well connected.

[0052] like Figure 4 As shown, further, the two positioning cylinders are respectively a main positioning cylinder (not shown in the figure) and an auxiliary positioning cylinder; the two positioning holes are respectively a main positioning hole 41 and an auxiliary positioning hole 42. The matching clearance between the main positioning cylinder and the main positioning hole 41 is smaller than the matching clearance between the auxiliary positioning cylinder and the auxiliary positioning hole 42. The PCBA control board is fixed by screws using screw mounting holes 43.

[0053] Specifically, the main positioning circular hole 41 is a small circular hole, and the small circular hole is tightly matched with the main positioning cylinder.

[0054] The auxiliary positioning circular hole 42 is a large circular hole whose diameter is larger than that of the auxiliary positioning cylinder, leaving an installation margin. The axis center of the cross section of the auxiliary positioning cylinder after installation may not be at the center of the large circular hole.

[0055] In one embodiment, the two PCBA control boards are an upper PCBA control board 6 and a lower PCBA control board 7 .

[0056] like Figure 4 As shown, the positioning posts are divided into upper PCBA positioning posts 32 and lower PCBA positioning posts 31, and each PCBA control board is provided with corresponding positioning notches for all positioning posts to pass through.

[0057] At least one positioning notch on one side of the upper PCBA control board 6 matches the upper PCBA positioning column 32, and at least two positioning notches on the other side match the upper PCBA positioning column 32, and the remaining positioning notches are used to allow margins to avoid all lower PCBA positioning columns 31. Specifically, some positioning notches are tightly matched with the upper PCBA positioning column 32 to achieve precise positioning, and the remaining positioning notches are too large to allow margins to avoid all lower PCBA positioning columns 31.

[0058] At least one positioning notch on one side of the lower PCBA control board 7 matches the lower PCBA positioning column 31, and at least two positioning notches on the other side match the lower PCBA positioning column 31, and the remaining positioning notches are used to allow margins to avoid all upper PCBA control boards 6. Specifically, some positioning notches are tightly matched with the lower PCBA positioning column 31 to achieve precise positioning, and the remaining positioning notches are too large to allow margins to avoid all upper PCBA positioning columns 32.

[0059] In one example, at least three positioning columns are disposed on each side of the bottom plate of the square housing along the Y direction, and the number of the upper PCBA positioning columns 32 and the number of the lower PCBA positioning columns 31 are respectively three.

[0060] The three upper PCBA positioning posts 32 are arranged in a triangle, one on one side in the Y direction and two on the other side in the Y direction.

[0061] The three lower PCBA positioning posts 31 are also arranged in a triangle, one on one side in the Y direction and two on the other side in the Y direction. The two triangles are arranged crosswise.

[0062] The domain control host of the double-layer PCBA control board of the present application has an ingenious positioning structure design. Some positioning notches are closely matched with one type of PCBA positioning columns to achieve precise positioning. The remaining positioning notches are too large to allow for the margin to avoid another type of PCBA positioning columns. Two rows of positioning columns can achieve X and Y positioning of two PCBA control boards, laying the foundation for improving installation accuracy.

[0063] In one embodiment, a short support block is disposed adjacent to the bottom of each positioning column, and all the short supports form a lower step surface 21; a long support block is disposed on each of the four side walls of the square housing, and all the long supports form an upper step surface 22. The short support blocks and the long support blocks do not need to avoid the PCBA control board, and the short support blocks are directly located at the bottom of the lower PCBA control board, and the long support blocks are directly located on both sides of the PCBA control board in the Y direction. Specifically, one or more long support blocks are disposed on each side of the upper PCBA control board in the Y direction, and an L-shaped opening groove is disposed on the top of the long support block, and the L-shaped opening groove supports the upper PCBA control board, and the vertical surface of the L-shaped opening groove does not abut against the side end surface of the upper PCBA control board.

[0064] In one embodiment, the domain control host 100 further includes an axial flow fan 2, which is fixedly disposed above the top plate of the square shell, and the fan itself is at a distance from the upper surface of the top plate to facilitate the horizontal diffusion of the wind flow after vertical blowing.

[0065] The wind flow of the axial flow fan 2 directly blows the set area of ​​the top plate, and the heat dissipation performance of the set area is the best. The upper PCBA control board 6 at the corresponding position of the set area is provided with the functional element with the highest heat generation power, and the functional element with the highest heat generation power contacts the top plate through the heat dissipation boss 14.

[0066] The heat of the functional components is first dissipated by the top plate and then carried away by the airflow of the axial flow fan 2 .

[0067] Functional elements include but are not limited to chip 16 and electronic devices.

[0068] Preferably, the axial flow fan 2 is arranged above the center of the top plate of the square housing.

[0069] In one embodiment, the square housing includes an upper cover 5, a connector back plate 10, and a middle frame 8 with an opening on the top surface and one side surface. The connector back plate 10 and the upper cover 5 are both detachably fixed to the middle frame 8 by screws. The middle frame 8 is installed on the vehicle by a mounting bracket 9. The upper cover 5 is fixed to the top surface of the middle frame 8 by a screw member 1. The connector back plate 10 is fixed to the side of the middle frame 8 by a screw member 1. The axial flow fan 2 is arranged on the upper cover 5.

[0070] like Figure 5 As shown, the rest of the upper cover 5 except the axial fan 2 is provided with sheet-like heat dissipation ribs 17. The sheet-like heat dissipation ribs 17 increase the heat dissipation area and improve the heat dissipation effect. There are relatively large gaps between the heat dissipation ribs, so that the airflow can flow better on the surface of the upper cover. In this way, most of the heat emitted from the upper cover can be taken away through the active heat dissipation of the fan.

[0071] like Figure 3 As shown, preferably, the connection plate of the middle frame 8 relative to the connector back plate 10 further includes a built-in antenna 11, and the built-in antenna 11 is installed to the connection plate of the middle frame 8 relative to the connector back plate 10 by screws.

[0072] In one embodiment, the domain control host 100 further includes a plurality of external connectors 12, which are connected to two PCBA control boards via signal lines; the connector backplane 10 has corresponding holes as required and is used to install the external connectors 12, so that signals can be input and output, thereby realizing related functions.

[0073] The domain control host of the double-layer PCBA control board of the present application adopts a set of PCB boards and shells. It only needs to change the number of openings on the connector backplane, and does not need to re-open multiple sets of molds to meet different configuration requirements, which greatly reduces mold costs and development cycles.

[0074] In one embodiment, the two PCBA control boards are each provided with a plurality of chips 16 acting as electronic controllers and other functional elements, and a plurality of heat dissipation bosses are provided at corresponding positions of the upper cover 5 and the bottom plate of the middle frame 8 .

[0075] like Figure 6 As shown, the heat dissipation boss and the chip 16 are filled with a heat conducting medium 15, and the heat conducting medium 15 is a heat conducting gel or a heat conducting silicone pad; the chip 16 or other functional components are respectively supported on the upper cover 5 or the bottom plate of the middle frame 8 through the heat dissipation boss 14 and the heat conducting medium 15. Specifically, the heat is contact-dissipated and diffused outward, and then carried away by the wind flow of the fan, or naturally dissipated.

[0076] Specifically, the thermally conductive gel or the thermally conductive silicone pad has a good thermal conductivity and can efficiently transfer heat from the functional device to the heat dissipation boss.

[0077] In the domain control host of the double-layer PCBA control board of the present application, the two PCBA control boards are arranged at an interval. Compared with the traditional technical solution, the high temperature will not be stuffy on the two PCBA control boards; at the same time, each chip or other functional element is respectively supported by the heat dissipation boss 14 and the heat conductive medium 15 against the bottom plate of the upper cover 5 or the middle frame 8 for contact heat dissipation, and the heat can be quickly diffused; further, the axial flow fan 2 is used to blow air, and the sheet-shaped heat dissipation ribs 17 are added, so that the heat dissipation effect of the entire domain control host is good.

[0078] In one embodiment, the fan harness 4 of the axial flow fan 2 passes through the upper cover 5 from top to bottom and is connected to the inner connector provided on the upper PCBA control board 6. A harness plug cover 3 is provided at the portion where the fan harness 4 passes through the upper cover 5 for connection communication. Specifically, the inner connector communicates with the chip, and the chip communicates with the external connector.

[0079] In this application, after installing the plugging cover, the protection level of the product can be increased to prevent water droplets, dust or other foreign matter from entering the entire machine through the hole and damaging the PCBA control board circuit.

[0080] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0081] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0082] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A domain control host of a double-layer PCBA control board, characterized in that: A square housing is provided with a lower step surface (21) and an upper step surface (22) spaced apart from each other by its own structure; the lower step surface (21) and the upper step surface (22) are used to position two PCBA control boards in the Z direction; two positioning cylinders are arranged diagonally on the bottom plate of the square housing; and at least three positioning cylinders are arranged on both sides of the bottom plate of the square housing along the Y direction; Two PCBA control boards are connected via a board-to-board connector (13); two positioning circular holes are arranged diagonally on the two PCBA control boards; the two positioning circular columns and the two positioning circular holes perform rough positioning on the two PCBA control boards in the X and Y directions; positioning notches are arranged at corresponding positions of the positioning columns on the two PCBA control boards; the positioning columns and the positioning notches perform fine positioning on the two PCBA control boards in the X and Y directions; the rough positioning and fine positioning ensure that the positioning accuracy in the X and Y directions meets the set requirements.

2. A domain control host of a double-layer PCBA control board as claimed in claim 1, characterized in that: The board-to-board connector (13) adopts a floating connector; the lower step surface (21) and the upper step surface (22) cooperate with each other, and the installation error of the actual height of the lower step surface (21) and the upper step surface (22) relative to the design height falls within the floating range of the floating connector in the height direction; the rough positioning and the fine positioning cooperate with each other, so that the installation errors of the two PCBA control boards in the X and Y directions fall within the floating range of the floating connector in the X and Y directions.

3. The domain control host of a double-layer PCBA control board according to claim 1, characterized in that: The two positioning cylinders are respectively a main positioning cylinder and an auxiliary positioning cylinder; the two positioning circular holes are respectively a main positioning circular hole (41) and an auxiliary positioning circular hole (42); the fitting clearance between the main positioning cylinder and the main positioning circular hole (41) is smaller than the fitting clearance between the auxiliary positioning cylinder and the auxiliary positioning circular hole (42), and the diameter of the auxiliary positioning circular hole 42 is larger than the diameter of the auxiliary positioning cylinder.

4. The domain control host of a double-layer PCBA control board according to claim 1, characterized in that: The two PCBA control boards are respectively an upper PCBA control board (6) and a lower PCBA control board (7); the positioning posts are divided into upper PCBA positioning posts (32) and lower PCBA positioning posts (31), and each PCBA control board is provided with corresponding positioning notches for all positioning posts to pass through; at least one positioning notch on one side of the upper PCBA control board (6) matches the upper PCBA positioning post (32), at least two positioning notches on the other side match the upper PCBA positioning post (32), and the remaining positioning notches are used to allow margins to avoid all lower PCBA positioning posts (31); at least one positioning notch on one side of the lower PCBA control board (7) matches the lower PCBA positioning post (31), at least two positioning notches on the other side match the lower PCBA positioning post (31), and the remaining positioning notches are used to allow margins to avoid all upper PCBA control boards (6).

5. The domain control host of a double-layer PCBA control board according to claim 1, characterized in that: A short support block is arranged adjacent to the bottom of each positioning column, and all the short supports form a lower step surface (21); a long support block is arranged on each of the four side walls of the square housing, and all the long supports form an upper step surface (22).

6. The domain control host of a double-layer PCBA control board according to claim 1, characterized in that: The domain control host (100) further comprises an axial flow fan (2), wherein the axial flow fan (2) is fixedly arranged above the top plate of the square housing; the airflow of the axial flow fan (2) directly blows a set area of ​​the top plate, and a functional element with the highest heat generation power is arranged on the upper PCBA control board (6) at a corresponding position of the set area, and the element with the highest heat generation power contacts the top plate through a heat dissipation boss (14).

7. A domain control host of a double-layer PCBA control board as claimed in claim 6, characterized in that: The square housing comprises an upper cover (5), a connector back plate (10), and a middle frame (8) with an opening on the top surface and a side surface; the connector back plate (10) and the upper cover (5) are both detachably fixed to the middle frame (8) by screws; the middle frame (8) is mounted on the vehicle by a mounting bracket (9); the axial flow fan (2) is arranged on the upper cover (5), and the top surface of the upper cover (5) is also provided with a sheet-like heat dissipation rib (17).

8. A domain control host of a double-layer PCBA control board as claimed in claim 7, characterized in that: The domain control host (100) further comprises a plurality of external connectors (12), wherein the external connectors (12) are connected to two PCBA control boards via signal lines; the connector backplane (10) is provided with corresponding holes as required and is used for installing the external connectors (12).

9. The domain control host of a double-layer PCBA control board according to claim 7, characterized in that: The two PCBA control boards are each provided with a plurality of chips acting as electronic controllers and other functional elements, and a plurality of heat dissipation bosses are provided at corresponding positions of the upper cover (5) and the bottom plate of the middle frame (8); The heat dissipation boss and the chip are filled with a heat-conducting medium (15), and the heat-conducting medium (15) is a heat-conducting gel or a heat-conducting silicone pad; the chip or other functional elements are respectively supported on the bottom plate of the upper cover (5) or the middle frame (8) through the heat dissipation boss (14) and the heat-conducting medium (15).

10. The domain control host of a double-layer PCBA control board according to claim 6, characterized in that: The fan harness (4) of the axial flow fan (2) passes through the upper cover (5) from top to bottom and is connected to an internal connector arranged on the upper PCBA control board (6); a harness blocking cover (3) is arranged at the position where the fan harness (4) passes through the upper cover (5) for connection communication.

Images