CN219675117U

CN219675117U - Automobile-level inertia measurement unit

Info

Publication number: CN219675117U
Application number: CN202320990850.5U
Authority: CN
Inventors: 蒋佩宇; 王雷; 赵炜
Original assignee: Wuxi Lins Tech Co ltd
Current assignee: Wuxi Lins Tech Co ltd
Priority date: 2023-04-27
Filing date: 2023-04-27
Publication date: 2023-09-12
Anticipated expiration: 2033-04-27

Abstract

The utility model discloses an automobile-level inertia measurement unit, which relates to the technical field of automobile navigation, and comprises a bottom plate, wherein the upper end of the bottom plate is provided with a shell, four side support mechanisms are arranged on the four walls of an inner cavity of the shell, a PCB (printed Circuit Board) is jointly arranged between the four side support mechanisms, the PCB is connected with an inertia sensor and a network access module, the PCB is connected with a serial peripheral interface, the serial peripheral interface extends to the outer side of the shell, sponge blocks are arranged at the four corners of the inner cavity of the shell, the sponge blocks wrap corners of the PCB, and a bottom support mechanism is arranged at the upper end of the bottom plate. The inertia measuring unit omits a car-level microprocessor, reduces the cost of products, reduces the size of the products, saves space for customers, reduces the contact area between the PCB and the inside of the shell, and reduces the influence of the outside on the inertia sensor.

Description

Automobile-level inertia measurement unit

Technical Field

The utility model relates to the technical field of automobile navigation, in particular to an automobile-level inertia measurement unit.

Background

The inertial navigation technology is used for determining the gesture, speed and position parameters of a moving object, and is widely applied to the fields of aerospace, aviation, navigation and geodetic measurement. Because MEMS sensors are all implemented by micro-mechanical structures, the misalignment angle between gyroscopes, the misalignment angle between accelerometers, the misalignment angle between gyroscopes and accelerometers, and scale factor errors when inertial elements form an inertial measurement unit are generally referred to as linear errors, and errors due to temperature of gyroscopes, accelerometers, and scale factors are referred to as temperature errors, so that the errors of the inertial measurement unit need to be calibrated and compensated. In particular for automotive applications, a more stable and reliable inertial measurement unit is required, and thus calibration and compensation becomes a requirement for automotive inertial measurement units.

As shown in fig. 7, in the prior art, compensation data of an inertial measurement unit of a MEMS (microprocessor) is stored in a memory inside the microprocessor of the MEMS (microprocessor), the microprocessor calculates the compensation algorithm and outputs the compensated data required by a customer, and an automotive domain controller communicates with the inertial measurement unit through an SPI (serial peripheral interface), reads the compensated data, and implements a combined navigation algorithm with a GPS (global positioning system) inside.

Disclosure of Invention

The utility model mainly aims to provide an automobile-level inertia measurement unit which can effectively solve the problems in the background technology.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

the utility model provides an automobile-level inertia measurement unit, inertia measurement unit is including the bottom plate, the shell is installed to the bottom plate upper end, the inner chamber four walls of shell all are provided with side direction supporting mechanism, four install the PCB board jointly between the side direction supporting mechanism, the PCB board is all connected with inertial sensor, the module of registering net, the PCB board is connected with serial peripheral interface, serial peripheral interface extends to the shell outside, the sponge piece is all installed in the inner chamber four corners of shell, the bight of sponge piece parcel PCB board, the bottom plate upper end is provided with bottom sprag mechanism, bottom sprag mechanism's upper end contacts with the lower extreme of PCB board.

Preferably, the lateral support mechanism comprises a sleeve, sleeve one end is fixedly connected with the inner wall of the shell, the sleeve and the PCB are located on the same horizontal plane, an inner cavity of the sleeve is slidably connected with a movable rod, a supporting plate is arranged at one end of the movable rod, far away from the sleeve, of the movable rod, the supporting plate is of an L-shaped structure, a buffer pad is arranged at the end face, close to the PCB, of the supporting plate, the buffer pad is fixedly connected with the PCB, springs are sleeved on the outer surfaces of the sleeve and the movable rod together, one ends of the springs are in contact with the inner wall of the shell, and the other ends of the springs are in contact with the supporting plate.

Preferably, the bottom supporting mechanism comprises a heat conducting plate, the upper end of the heat conducting plate is tightly connected with the lower end of the PCB, a plurality of metal columns are arranged at the lower end of the heat conducting plate, and the lower ends of the metal columns are fixedly connected with the upper end of the bottom plate.

Preferably, the PCB is suspended in the inner cavity of the shell and is arranged in the middle.

Preferably, the four corners of the shell are respectively provided with a concave area, the four corners of the upper end of the bottom plate are respectively provided with through holes, and the four through holes are respectively positioned right below the four concave areas.

Preferably, a gap is arranged between the through hole and the concave area.

Compared with the prior art, the utility model has the following beneficial effects:

1. the inertial measurement unit uploads the linear and temperature compensation data corresponding to the unique serial number to the cloud memory, the compensation data in the cloud memory is read by utilizing the network of the automobile domain controller, the analysis and fusion of the compensation data are realized by utilizing the microprocessor in the automobile domain controller through the linear and temperature compensation algorithm library provided by the manufacturer, and finally the combination of inertial navigation and satellite navigation is realized, so that one automobile-level microprocessor of the inertial measurement unit in the prior art is omitted, the cost of products is reduced, the size of the products is reduced, and the cost and space are saved for customers;

2. the PCB is suspended in the inner cavity of the shell through the lateral supporting mechanism and the bottom supporting mechanism, so that the contact between the PCB and the inner wall of the shell is avoided, and when the shell is impacted or vibrated, the influence of the inertial sensor can be reduced, and the measurement precision of the inertial measurement unit is further ensured;

3. the bottom support mechanism can conduct heat generated during the working of the PCB to the metal column, and the contact area between the metal column and air is increased, so that the heat dissipation efficiency is improved.

Drawings

Fig. 1 is a schematic structural diagram of the whole compensation data networking storage scheme proposed in the present embodiment;

FIG. 2 is a schematic diagram of an inertial measurement unit according to the present embodiment;

FIG. 3 is a schematic cross-sectional view of an inertial measurement unit according to the present embodiment;

fig. 4 is a schematic view showing the internal structure of the housing in the present embodiment;

FIG. 5 is a schematic view of the bottom support mechanism of the present embodiment;

FIG. 6 is a schematic view of the lateral support mechanism in the present embodiment;

FIG. 7 is a prior art networked storage scheme for compensation data for an automotive-grade inertial measurement unit.

In the figure: 1. a bottom plate; 11. a through hole; 2. a housing; 21. a concave region; 3. a lateral support mechanism; 31. a sleeve; 32. a movable rod; 33. a supporting plate; 331. a cushion pad; 34. a spring; 4. a PCB board; 5. an inertial sensor; 6. a network access module; 7. a sponge block; 8. a serial peripheral interface; 9. a bottom support mechanism; 91. a heat conductive plate; 92. and (5) a metal column.

Detailed Description

The utility model is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the utility model easy to understand.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be configured and operated in the specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "provided," "connected," and the like are to be construed broadly, and may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

As shown in fig. 1-6, an automobile-level inertial measurement unit is connected with a cloud storage, the cloud storage is connected with an automobile domain controller, the inertial measurement unit is connected with the automobile domain controller through SPI communication, the inertial measurement unit comprises an inertial sensor 5 and a network access module 6, the inertial measurement unit uploads linear and temperature compensation data corresponding to a unique serial number to the cloud storage, and the automobile domain controller reads the compensation data in the cloud storage through a network of the inertial measurement unit, and analysis and fusion of the compensation data are realized through a linear and temperature algorithm library provided by a manufacturer, so that inertial navigation and satellite navigation combination are realized.

The microprocessor in the inertial measurement unit in the prior art is removed, the linear and temperature compensation data corresponding to the unique serial number of the inertial measurement unit are uploaded to the cloud storage through the network access module 6, the network access module 6 in the embodiment adopts the WIFI module, the data communication with the cloud storage is realized by utilizing the network of the automobile, the compensation data are read through the network of the automobile domain controller, and the analysis fusion of the compensation data is realized through the algorithm library provided by the manufacturer.

Specifically, the inertia measurement unit still includes bottom plate 1, shell 2 is installed to bottom plate 1 upper end, the inner chamber four walls of shell 2 all are provided with side direction supporting mechanism 3, four install PCB board 4 jointly between the side direction supporting mechanism 3, PCB board 4 all is connected with inertial sensor 5, net access module 6, PCB board 4 is connected with serial peripheral interface 8, serial peripheral interface 8 extends to the shell 2 outside, sponge piece 7 is all installed in the inner chamber four corners of shell 2, the bight of sponge piece 7 parcel PCB board 4, bottom plate 1 upper end is provided with bottom supporting mechanism 9, bottom supporting mechanism 9's upper end contacts with PCB board 4's lower extreme. Through setting up side direction supporting mechanism 3 and bottom sprag mechanism 9 with the unsettled erect of PCB board 4 in the inner chamber of shell 2, avoid PCB board 4 to take place to contact with the inner wall of shell 2, when shell 2 received striking or vibration, reducible inertial sensor 5 received the influence, and then ensured inertial measurement unit's measurement accuracy. In order to avoid collision between four corners of the PCB 4 and the inner wall of the shell 2, the four corners of the PCB 4 are protected by the sponge block 7.

Specifically, the lateral support mechanism 3 includes sleeve 31, sleeve 31 one end and the inner wall fixed connection of shell 2, sleeve 31 and PCB board 4 are located same horizontal plane, the inner chamber sliding connection of sleeve 31 has movable rod 32, the layer board 33 is installed to the one end that sleeve 31 was kept away from to movable rod 32, layer board 33 is L shape structure, the blotter 331 is installed to the terminal surface that layer board 33 is close to PCB board 4, blotter 331 and PCB board 4 fixed connection, sleeve 31 and movable rod 32 surface cup joint spring 34 jointly, the one end and the inner wall contact of shell 2 of spring 34, the other end and layer board 33 contact. When the shell 2 is vibrated or impacted, the two lateral support mechanisms 3 located at the left side and the right side can only enable the PCB 4 to move left and right, the two lateral support mechanisms 3 located at the front side and the rear side can only enable the PCB 4 to move forward and backward, the two groups of lateral support mechanisms 3 are mutually restricted, the PCB 4 cannot move, glue solution is adopted between the buffer cushion 331 and the PCB 4 to adhere, namely, the PCB 4 can generate fine displacement, at the moment, acting force generated when the PCB 4 is offset through the spring 34, and the PCB 4 is kept centered.

Specifically, the bottom supporting mechanism 9 includes a heat conducting plate 91, the upper end of the heat conducting plate 91 is tightly connected with the lower end of the PCB 4, a plurality of metal columns 92 are installed at the lower end of the heat conducting plate 91, and the lower ends of the metal columns 92 are fixedly connected with the upper end of the bottom plate 1. The bottom of the PCB 4 is supported through the bottom supporting mechanism 9, in the embodiment, heat conduction silica gel is coated between the heat conduction plate 91 and the PCB 4, heat generated during the working of the PCB 4 can be effectively transferred to the heat conduction plate 91, the heat conduction plate 91 conducts the heat to the metal column 92, the contact area between the metal column 92 and air is increased, and the heat dissipation efficiency is improved.

Specifically, the PCB 4 is suspended in the cavity of the housing 2 and is centrally disposed.

For the convenience of installation of the bottom plate 1, in this embodiment, four corners of the housing 2 are provided with concave regions 21, four corners of the upper end of the bottom plate 1 are provided with through holes 11, and four through holes 11 are respectively located right below the four concave regions 21; a gap is formed between the through hole 11 and the concave region 21. When mounting the base plate 1, screws may be used to fix the base plate 1 to the mounting surface through the through holes 11.

The foregoing has shown and described the basic principles and main features of the present utility model and the advantages of the present utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. An automotive-grade inertial measurement unit, characterized by: the inertial measurement unit is including bottom plate (1), shell (2) are installed to bottom plate (1) upper end, the inner chamber four walls of shell (2) all are provided with side direction supporting mechanism (3), four install PCB board (4) jointly between side direction supporting mechanism (3), PCB board (4) all are connected with inertial sensor (5), net access module (6), PCB board (4) are connected with serial peripheral interface (8), serial peripheral interface (8) extend to the shell (2) outside, sponge piece (7) are all installed in the inner chamber four corners of shell (2), sponge piece (7) parcel PCB board (4) bight, bottom plate (1) upper end is provided with bottom sprag mechanism (9), the upper end of bottom sprag mechanism (9) contacts with the lower extreme of PCB board (4).

2. An automotive grade inertial measurement unit according to claim 1, wherein: the lateral support mechanism (3) comprises a sleeve (31), one end of the sleeve (31) is fixedly connected with the inner wall of the shell (2), the sleeve (31) and the PCB (4) are located on the same horizontal plane, an inner cavity of the sleeve (31) is slidably connected with a movable rod (32), a supporting plate (33) is arranged at one end, far away from the sleeve (31), of the movable rod (32), the supporting plate (33) is of an L-shaped structure, a buffer pad (331) is arranged at the end face, close to the PCB (4), of the supporting plate (33), the buffer pad (331) is fixedly connected with the PCB (4), springs (34) are sleeved on the outer surfaces of the sleeve (31) and the movable rod (32) together, one end of each spring (34) is in contact with the inner wall of the shell (2), and the other end of each spring is in contact with the supporting plate (33).

3. An automotive grade inertial measurement unit according to claim 1, wherein: the bottom supporting mechanism (9) comprises a heat conducting plate (91), the upper end of the heat conducting plate (91) is tightly connected with the lower end of the PCB (4), a plurality of metal columns (92) are arranged at the lower end of the heat conducting plate (91), and the lower ends of the metal columns (92) are fixedly connected with the upper end of the bottom plate (1).

4. An automotive grade inertial measurement unit according to claim 1, wherein: the PCB (4) is suspended in the inner cavity of the shell (2) and is arranged in the middle.

5. An automotive grade inertial measurement unit according to claim 1, wherein: the four corners of the shell (2) are respectively provided with a concave area (21), the four corners of the upper end of the bottom plate (1) are respectively provided with through holes (11), and the four through holes (11) are respectively positioned under the four concave areas (21).

6. An automotive grade inertial measurement unit according to claim 5, wherein: a gap is formed between the through hole (11) and the concave area (21).