A Dual-Output Redundant ESC Pressure Sensor

Abstract

The present invention provides a dual-output redundant ESC pressure sensor, comprising a sensing module, a mounting frame, a circuit board assembly, an outer shell, a spring bracket, and a contact spring. The sensing module is arranged at the bottom of the outer shell, and the portion of the sensing module located at the outer shell is mounted and spliced ​​with the circuit board assembly through the mounting frame; the top of the mounting frame is provided with a spring bracket, and three groups of contact springs are interspersed and installed inside the spring bracket. The present invention adopts two full-bridge sensing units, and the SENT signal protocol can ensure the segmented output of two pressure signals, realizing the dual signal output of a single ESC pressure sensor, and the redundant design can effectively ensure the braking safety of the vehicle.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure sensors, and in particular to a redundant ESC pressure sensor with dual outputs. Background Art

[0002] The ESC pressure sensor is part of the car's ESC system and provides the system with the driver's braking needs. Its function is to prevent the brake pressure medium from leaking on the ESC and AHB (active hydraulic booster) systems during its service life. The pressure sensor is electrically connected to the ECU to provide the measurement signal of the brake oil pressure to the system controller.

[0003] The existing ESC pressure sensor is a piezoresistive pressure sensor based on glass sintering technology. The output signal is a single SENT digital signal. For safety reasons, each brake disc often needs to be installed with two or more ECS pressure sensors, which greatly increases the system complexity and cost. Summary of the invention

[0004] The present invention aims to provide a dual-output redundant ESC pressure sensor to overcome the above problems or at least partially solve the above problems.

[0005] To achieve the above object, the technical solution of the present invention is specifically implemented as follows:

[0006] The present invention provides a redundant ESC pressure sensor with dual outputs, including an induction module, a mounting bracket, a circuit board assembly, a housing, a spring bracket, and a contact spring. The induction module is arranged at the bottom end of the housing. The part of the induction module located in the housing is installed and spliced with the circuit board assembly through the mounting bracket. A plurality of protruding brackets are arranged at the edge of the mounting bracket. A first buckle is arranged above the mounting bracket, and the first buckle is installed and fixed to the inner wall of the housing in cooperation with the mounting bracket. A second buckle is arranged at the top end of the circuit board assembly. A spring bracket is arranged at the top end of the mounting bracket. A fourth buckle is arranged on the surface of the spring bracket that fits the inner wall of the housing, and the fourth buckle is installed in cooperation with the first buckle arranged in the housing. A third buckle is arranged at one end of the spring bracket inside the housing, and the third buckle corresponds to and is spliced with the second buckle of the circuit board assembly. Three groups of contact springs are inserted and installed inside the spring bracket. One end of the contact spring arranged inside the housing is provided with an extension bracket, and the extension bracket is perpendicular to the main body of the contact spring, and the whole is in an "L" shape. The three groups of contact springs are distributed and installed in an inverted "pin" shape. The extension brackets of the group of contact springs at the bottom are staggered with the extension brackets of the other two groups of contact springs at the top in opposite directions. The extension bracket is arranged at the middle gap of the corresponding splicing position of the third buckle and the second buckle, and the installation of the extension bracket is an interference fit and is fixed by soldering. The induction module includes a pressure port, a unit base, and two full-bridge induction units. The pressure port and the unit base are fixed by laser welding or resistance welding. The induction units are bonded to the unit base through a glass fusing technology. The pressure sensing surface of the unit base is arranged at 90° to the pressure port. The pressure port is arranged below the housing, and the housing and the pressure port are fixed by bottom welding. The pressure port is fixed to the side surface of the mounting bracket by welding. The unit base is attached to the induction module and is arranged inside the housing. The unit base and the pressure port are independent, and the unit base and the pressure port are made of the same material or two different metal materials. The two induction units are electrically connected to the circuit board assembly through connecting wires.

[0007] As a further solution of the present invention, the housing is a cylindrical structure with openings at both ends; the first buckle and the mounting bracket form an annular structure.

[0008] As a further solution of the present invention, the circuit board assembly and the brackets on the mounting bracket are connected by soldering.

[0009] As a further solution of the present invention, the contact spring is composed of two springs with different structures. One section has a small diameter and a tight pitch and is arranged outside the housing, and the other section has a large diameter and a loose pitch and is arranged inside the housing. A conical transition section is arranged between the two springs.

[0010] The present invention provides a dual-output redundant ESC pressure sensor, which has the beneficial effects of: the pressure medium is transmitted to the sensing unit through the pressure port and the metal diaphragm of the unit base, and the pressure signal is transmitted to the circuit board assembly through the connecting line, and then the pressure signal is output through the contact spring. Since the present design adopts two full-bridge sensing units and the SENT signal protocol can ensure the segmented output of the two pressure signals, the dual signal output of a single ESC pressure sensor is realized, and the redundant design can effectively ensure the braking safety of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0012] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0013] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention.

[0014] Figure 3 It is an exploded view of the three-dimensional structure of the present invention.

[0015] Figure 4 It is a schematic structural diagram of the spring bracket in the present invention.

[0016] Figure 5 It is a schematic diagram of the structure of the contact spring in the present invention.

[0017] Figure 6 It is a schematic diagram of the installation and matching of the contact spring and the spring bracket in the present invention.

[0018] Figure 7 It is a schematic diagram of the three-dimensional structure of the sensing module in the present invention.

[0019] Figure 8 It is an exploded view of the sensing module in the present invention.

[0020] Fig. 9 It is a cross-sectional view of the sensing module in the present invention.

[0021] In the figure: 1. Sensing module; 11. Pressure port; 12. Unit base; 13. Sensing unit; 2. Mounting frame; 21. Bracket; 22. First buckle; 3. Circuit board assembly; 31. Second buckle; 4. Outer shell; 5. Spring bracket; 51. Third buckle; 52. Fourth buckle; 6. Contact spring; 61. Extension frame; 7. Connecting wire. DETAILED DESCRIPTION

[0022] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be completely conveyed to those skilled in the art.

[0023] Referring to Figure 1-9 , a dual-output redundant ESC pressure sensor provided by an embodiment of the present invention includes an induction module 1, a mounting bracket 2, a circuit board assembly 3, a housing 4, a spring bracket 5, and a contact spring 6. The induction module 1 is disposed at the bottom end of the housing 4. The housing 4 is a cylindrical structure with openings at both ends. The part of the induction module 1 located in the housing 4 is installed and spliced with the circuit board assembly 3 through the mounting bracket 2. A plurality of protruding brackets 21 are provided at the edge of the mounting bracket 2. The circuit board assembly 3 is soldered to the brackets 21 on the mounting bracket 2. A first buckle 22 is provided above the mounting bracket 2. The first buckle 22 and the mounting bracket 2 form an annular structure. The first buckle 22 is cooperatively installed and fixed with the inner wall of the housing 4 through the mounting bracket 2. A second buckle 31 is provided at the top end of the circuit board assembly 3.

[0024] A spring bracket 5 is provided at the top end of the mounting bracket 2. A fourth buckle 52 is provided on the surface of the spring bracket 5 that fits the inner wall of the housing 4. The fourth buckle 52 is cooperatively installed with the first buckle 22 provided in the housing 4, so that the spring bracket 5 and the mounting bracket 2 are jointly fixed inside the housing 4. A third buckle 51 is provided at one end of the spring bracket 5 disposed inside the housing 4. The third buckle 51 corresponds to and is spliced with the second buckle 31 of the circuit board assembly 3. Three groups of contact springs 6 are inserted and installed inside the spring bracket 5. An extension bracket 61 is provided at one end of the contact spring 6 disposed inside the housing 4. The extension bracket 61 is perpendicular to the main body of the contact spring 6 and is integrally in an "L" shape. The three groups of contact springs 6 are distributed and installed in an inverted "pin" shape, and the extension brackets 61 of the three groups of contact springs 6 are staggered in two opposite directions. The extension bracket 61 is disposed at the middle gap between the corresponding splicing positions of the third buckle 51 and the second buckle 31. The installation of the extension bracket 61 is an interference fit and is fixed by soldering, thereby realizing the fixation of the contact spring 6.

[0025] As Figure 5 、 6As shown, the contact spring 6 is composed of two sections of springs with different structures, namely, one section with a small diameter and a tight pitch, which is arranged on the outside of the outer shell 4, and the other section with a large diameter and a loose pitch, which is arranged on the inside of the outer shell 4. A conical transition section is arranged between the two sections of the spring. The arrangement of the conical transition section can effectively prevent the axial displacement of the contact spring 6 when the contact spring 6 is installed as a whole in the spring bracket 5.

[0026] like Figure 7-9 As shown, the sensing module 1 includes a pressure port 11, a unit base 12 and two full-bridge sensing units 13. The pressure port 11 and the unit base 12 are fixed by laser welding or resistance welding, and the sensing unit 13 is bound to the unit base 12 by glass welding technology; the pressure sensing surface of the unit base 12 is at 90° to the pressure port 11, and the pressure port 11 is arranged below the outer shell 4. The outer shell 4 and the pressure port 11 are fixed by bottom surface welding, and the pressure port 11 is fixed to the side of the mounting frame 2 by welding. The unit base 12 is attached to the sensing module 1 and is arranged inside the outer shell 4. The unit base 12 and the pressure port 11 are independent and can be made of the same material or two different metal materials. Such an arrangement can effectively reduce costs; the two sensing units 13 are electrically connected to the circuit board assembly 3 through the connecting line 7.

[0027] The working principle of the present invention is as follows: the pressure medium is transmitted to the pressure sensing unit 13 through the pressure port 11 and the metal diaphragm of the unit base 12, and its pressure signal is transmitted to the circuit board assembly 3 through the connecting line 7, and then the output of the pressure signal is realized through the contact spring 6. Since the present design adopts two full-bridge pressure sensing units 13, and the SENT signal protocol can ensure the segmented output of the two pressure signals, the dual signal output of a single ESC pressure sensor is realized, and the redundant design can effectively ensure the braking safety of the vehicle.

[0028] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A dual-output redundant ESC pressure sensor, comprising a sensing module (1), a mounting frame (2), a circuit board assembly (3), an outer shell (4), a spring bracket (5), and a contact spring (6), characterized in that: The induction module (1) is arranged at the bottom end of the outer housing (4). The part of the induction module (1) located in the outer housing (4) is installed and spliced with the circuit board assembly (3) through the mounting bracket (2). A plurality of protruding brackets (21) are arranged at the edge of the mounting bracket (2). A first buckle (22) is erected above the mounting bracket (2). The first buckle (22) cooperates with the mounting bracket (2) to be installed and fixed on the inner wall of the outer housing (4); a second buckle (31) is arranged at the top end of the circuit board assembly (3); a spring bracket (5) is arranged at the top end of the mounting bracket (2). A fourth buckle (52) is arranged on the surface of the spring bracket (5) that fits the inner wall of the outer housing (4). The fourth buckle (52) is installed in cooperation with the first buckle (22) arranged in the outer housing (4). A third buckle (51) is arranged at one end of the spring bracket (5) inside the outer housing (4). The third buckle (51) corresponds to the second buckle (31) of the circuit board assembly (3) and is spliced and installed; three sets of contact springs (6) are inserted and installed inside the spring bracket (5). One end of the contact spring (6) arranged inside the outer housing (4) is provided with an extension bracket (61). The extension bracket (61) is perpendicular to the main body of the contact spring (6) and is integrally in an "L" shape. The three sets of contact springs (6) are distributed and installed in an inverted "pin" shape. The extension brackets (61) of the set of contact springs (6) at the bottom are arranged in a staggered manner in the opposite direction to the extension brackets (61) of the other two sets of contact springs (6) at the top. The extension bracket (61) is arranged at the middle gap at the corresponding splicing position of the third buckle (51) and the second buckle (31). The installation of the extension bracket (61) is an interference fit and is fixed by soldering. The induction module (1) includes a pressure port (11), a unit base (12), and two full-bridge induction units (13). The pressure port (11) and the unit base (12) are fixed by laser welding or resistance welding. The induction unit (13) is bonded to the unit base (12) through a glass fusing technique; the pressure sensing surface of the unit base (12) is arranged at 90° to the pressure port (11). The pressure port (11) is arranged below the outer housing (4). The outer housing (4) and the pressure port (11) are fixed by bottom welding. The pressure port (11) is fixed to the side surface of the mounting bracket (2) by welding. The unit base (12) is attached to the induction module (1) and is arranged inside the outer housing (4). The unit base (12) and the pressure port (11) are independent. The unit base (12) and the pressure port (11) are made of the same material or two different metal materials; the two induction units (13) are electrically connected to the circuit board assembly (3) through a connecting wire (7).

2. A dual-output redundant ESC pressure sensor according to claim 1, characterized in that: The outer housing (4) is a cylindrical structure with openings at both ends; the first buckle (22) and the mounting bracket (2) form an annular structure.

3. A dual-output redundant ESC pressure sensor according to claim 1, characterized in that: The circuit board assembly (3) is connected to the bracket (21) on the mounting bracket (2) by soldering.

4. A dual-output redundant ESC pressure sensor according to claim 1, characterized in that: The contact spring (6) is composed of two sections of springs with different structures, one section having a small diameter and a tight pitch and arranged on the outside of the outer shell (4), and the other section having a large diameter and a loose pitch and arranged on the inside of the outer shell (4), and a conical transition section is arranged between the two sections of the spring.

Images