Single-channel multi-simulation brake pressure sensor

Abstract

The utility model discloses a single-channel multi-analog signal brake pressure sensor, which relates to the field of sensors and comprises a metal sensitive element assembly with a circular structure, a PCBA (Printed Circuit Board Assembly) assembly, a connector assembly and a detection spring, a bottom plate of the metal sensitive element assembly is in close contact with the PCBA assembly, four silicon wafers are attached to the bottom plate of the metal sensitive element assembly, and the silicon wafers are electrically connected with the PCBA assembly; each silicon wafer is provided with a group of resistors, and the four silicon wafers form two groups of Wheatstone bridge structures; the tail end of the connector assembly is clamped with the PCBA assembly, and the detection springs are arranged at the two ends of the connector assembly in a penetrating mode and make contact with contacts on the PCBA assembly to conduct voltage signals. According to the scheme, four silicon wafers and resistors are pasted at the bottom of the sensitive element assembly, so that two groups of Wheatstone bridges are formed, the Wheatstone bridges are electrically connected with the PCBA assembly, acquisition and processing of analog signals are realized, and single-channel multi-analog signal transmission is realized.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of sensors, and in particular to a single-channel multi-analog brake pressure sensor. Background Art

[0002] In the braking system of passenger cars, brake pressure sensors are usually required to detect brake pressure signals. However, if there are many signals to be collected, multiple sensors or multi-channel sensors are required. Using multiple sensors will take up space and increase costs, and multi-channel sensors require circuit structures and systems designed for multiple channels. In addition, the brake pressure sensors used in most passenger car braking systems collect and analyze digital signals, that is, digital output sensors, which further require built-in sampling circuits, increase the volume of the sensor structure, and for high-speed vehicles, collecting digital signal outputs has certain requirements for vehicle safety and stability. Utility Model Content

[0003] The embodiment of the present application provides a single-channel multi-analog brake pressure sensor to solve the volume and delay problems of single-channel acquisition and digital acquisition of the brake pressure sensor.

[0004] The single-channel multi-analog brake pressure sensor includes a circular metal sensitive element assembly, a PCBA assembly, a connector assembly and a detection spring;

[0005] The bottom plate of the metal sensitive element assembly is in close contact with the PCBA assembly, and four silicon chips are attached to the bottom plate of the metal sensitive element assembly, and the silicon chips are electrically connected to the PCBA assembly; a group of resistors is installed on each silicon chip, and the four silicon chips form two groups of Wheatstone bridge structures;

[0006] The tail end of the connector assembly is engaged with the PCBA assembly, and the detection spring is passed through both ends of the connector assembly and contacts with the contacts on the PCBA assembly to conduct voltage signals.

[0007] Specifically, two groups of Wheatstone bridge structures respectively collect and transmit two analog signals.

[0008] Specifically, the PCBA assembly includes a metal support ring and a circular PCBA printed circuit board; the metal support ring is sleeved on the periphery of the bottom plate of the metal sensitive element assembly; and the PCBA printed circuit board is attached to the bottom plate of the metal sensitive element assembly.

[0009] Specifically, the outer diameter of the PCBA printed circuit board is greater than the inner diameter of the metal support ring, and the PCBA printed circuit board is supported by the metal support ring.

[0010] Specifically, a through hole is opened in the center of the circular PCBA printed circuit board, and four silicon chips are located on the bottom plate in the through hole area and are electrically connected to the PCBA printed circuit board through leads.

[0011] Specifically, a card interface is provided on the PCBA printed circuit board and the metal support ring, and the connector assembly is engaged with the PCBA assembly through the card interface.

[0012] Specifically, the connector assembly includes a base and a clamping ring connected to the base. Three mounting holes are provided on the base, and three groups of detection springs are provided in the holes.

[0013] Specifically, the length of the detection spring is greater than the length of the connector assembly, and both ends of the spring extend out of the base and the end of the clamp ring respectively, and the end of the detection spring in the clamp ring contacts with the contact on the PCBA printed circuit board.

[0014] Specifically, two protruding latches are provided at the bottom of the latch ring, and the latches match the card interfaces provided on the PCBA printed circuit board and the metal support ring.

[0015] Specifically, a cylindrical stretching piece is arranged between the bottom of the metal sensitive element assembly and the base of the connector assembly; the stretching piece encloses the bottom plate of the metal sensitive element assembly, the PCBA assembly and the clamping ring of the connector assembly.

[0016] The beneficial effects brought about by the technical solution provided in the embodiment of the present application include at least: the solution forms two groups of Wheatstone bridges by pasting four silicon chips and resistors on the bottom of the metal sensitive element assembly, and the Wheatstone bridges are electrically connected to the PCBA assembly to realize the collection and processing of analog signals; the connector assembly and the PCBA assembly are engaged to facilitate fixation and disassembly; the detection spring passes through the connector assembly and contacts with the contacts of the PCBA printed circuit board to realize signal transmission, and finally outputs the signal to the vehicle system through a single channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a single-channel multi-analog brake pressure sensor provided by the present application;

[0018] Figure 2 It is an exploded diagram of a single-channel multi-analog brake pressure sensor;

[0019] Figure 3 It is a circuit diagram of a silicon chip and resistor forming a Wheatstone bridge;

[0020] Figure 4 is a connection diagram of the detection spring and the connector assembly;

[0021] Figure 5It is a detection schematic diagram of two sets of analog signals;

[0022] Figure 6 It is a structural diagram for installing tensile parts.

[0023] Figure numerals: 1. Metal sensitive element assembly; 2. PCBA assembly; 21. Metal support ring; 22. PCBA printed circuit board; 23. Through hole; 24. Card interface; 3. Connector assembly; 31. Base; 32. Clamp ring; 33. Tongue; 4. Detection spring; 5. Silicon wafer; 6. Tensile member. DETAILED DESCRIPTION

[0024] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0025] The term "multiple" as used herein refers to two or more than two. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the related objects are in an "or" relationship.

[0026] Figure 1 is a structural schematic diagram of a single-channel multi-analog brake pressure sensor provided by this application, Figure 2 It is an exploded schematic diagram of a single-channel multi-analog brake pressure sensor. The sensor structure includes a circular metal sensitive element assembly 1, a PCBA assembly 2, a connector assembly 3 and a detection spring 4. The bottom plate of the metal sensitive element assembly 1 is in close contact with the PCBA assembly 2, and four silicon chips 5 are attached to the bottom plate of the metal sensitive element assembly 1, and the silicon chips 5 are electrically connected to the PCBA assembly 2. The silicon chips 5 are attached to the bottom plate, mainly to generate induction signals. A group of resistors are installed on each silicon chip 5, and the four silicon chips 5 form two groups of Wheatstone bridge structures. The tail end of the connector assembly 3 is engaged with the PCBA assembly 2, and the detection spring 4 is inserted at both ends of the connector assembly 3 and contacts with the contacts on the PCBA assembly 2 to conduct voltage signals.

[0027] Figure 3 It is a circuit diagram of a Wheatstone bridge formed by a silicon chip and a resistor. Two groups of Wheatstone bridge structures respectively collect and transmit two analog signals. The two groups of analog signals are sent to the vehicle system through the PCBA assembly 2, the connector assembly 3 and the detection spring 4.

[0028] like Figure 2As shown, the PCBA assembly 2 includes a metal support ring 21 and a circular PCBA printed circuit board 22, and the metal support ring 21 is sleeved on the outer periphery of the bottom plate of the metal sensitive component assembly 1. The PCBA printed circuit board 22 is attached to the bottom plate of the metal sensitive component assembly 1. The outer diameter of the PCBA printed circuit board 22 is greater than or equal to the inner diameter of the metal support ring 21, and the height of the metal support ring 21 is the same as the height of the bottom plate of the metal sensitive component assembly 1, so that the PCBA printed circuit board 22 can be supported by the metal support ring 21.

[0029] Because the silicon chip 5 needs to be connected to the PCBA printed circuit board 22, a through hole 23 is also opened in the center of the circular PCBA printed circuit board 22, and the four silicon chips 5 are attached to the bottom plate in the through hole 23 area, so that they can be electrically connected to the PCBA printed circuit board 22 through leads.

[0030] Figure 4 : is a connection diagram of the detection spring and the connector assembly. The connector assembly 3 includes a base 31 and a collar 32 connected to the base 31. Three mounting holes are provided on the base 31, and three groups of detection springs 4 are provided in the holes. The length of the detection spring 4 is greater than the length of the connector assembly 3, and the two ends of the spring extend out of the base 31 and the ends of the collar 32 respectively. The end of the detection spring 4 in the collar 32 contacts the contact on the PCBA printed circuit board 22. The three detection springs 4 provide the processing circuit with positive power, negative power and signal output, and realize signal transmission through the spring.

[0031] Figure 5 It is a detection schematic diagram of two sets of analog signals. After the Wheatstone bridge passes through the processing circuit, it outputs voltage signals ① and ② that are proportional to the excitation source. The two signals come from two sets of sensitive elements, which can realize mutual verification between single sensor signals. Voltage signals ① and ② are transmitted to the system that needs the signal through a spring, and the entire signal transmission will not cause mutual interference between signals. The product is small in size, which is conducive to the layout of the product in the system. In some embodiments, the sum of voltage signals ① and ② can be set to a fixed value, which is convenient for the system to set diagnostic strategies and thresholds.

[0032] The output signal segment first identifies the initial position ③. This segment consists of two fixed-cycle high and low voltages, and this voltage value is not included in the voltage range of ① and ②. An interval signal is set between the two voltage signals ① and ②. The identification position and signal interval are composed of voltage cycle signals that are completely different from the normal output of the product, which is easy to identify.

[0033] In order to facilitate the fixing of each component, a card interface 24 is provided on the PCBA printed circuit board 22 and the metal support ring 21, and the connector assembly 3 is engaged with the PCBA assembly 2 through the card interface 24. Two protruding latches 33 are provided at the bottom of the latch ring 32, and the latches 33 match the card interfaces 24 provided on the PCBA printed circuit board 22 and the metal support ring 21.

[0034] See also Figure 6 A cylindrical stretching member 6 is provided between the bottom of the metal sensitive element assembly 1 and the base 31 of the connector assembly 3. The stretching member 6 covers the bottom plate of the metal sensitive element assembly 1, the PCBA assembly 2 and the collar 32 of the connector assembly 3, and the stretching member 6 can effectively protect the internal components.

[0035] In summary, this solution forms two sets of Wheatstone bridges by pasting four silicon chips and resistors on the bottom of the metal sensitive element assembly. The Wheatstone bridge is electrically connected to the PCBA assembly to realize the collection and processing of analog signals. The connector assembly and the PCBA assembly are engaged to facilitate fixation and disassembly. The detection spring passes through the connector assembly and contacts with the contacts of the PCBA printed circuit board to realize signal transmission, and finally outputs the signal to the vehicle system through a single channel.

[0036] The preferred embodiments of the present invention are described above; it should be understood that the present invention is not limited to the above-mentioned specific implementation modes, and the devices and structures not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can make many possible changes and modifications without departing from the technical solution of the present invention, or modify them into equivalent embodiments with equivalent changes, which does not affect the essential content of the present invention; therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of protection of the technical solution of the present invention.

Claims

1. A single-channel multi-analog brake pressure sensor, characterized in that: It comprises a circular metal sensitive element assembly (1), a PCBA assembly (2), a connector assembly (3) and a detection spring (4); The bottom plate of the metal sensitive element assembly (1) is in close contact with the PCBA assembly (2), and four silicon chips (5) are attached to the bottom plate of the metal sensitive element assembly (1), and the silicon chips (5) and the PCBA assembly (2) are electrically connected; a group of resistors is installed on each silicon chip (5), and the four silicon chips (5) form two groups of Wheatstone bridge structures; The tail end of the connector assembly (3) is engaged with the PCBA assembly (2), and the detection spring (4) is inserted through both ends of the connector assembly (3) and contacts with the contacts on the PCBA assembly (2) to conduct voltage signals.

2. The single-channel multi-analog brake pressure sensor according to claim 1, characterized in that: Two groups of Wheatstone bridge structures collect and transmit two analog signals respectively.

3. The single-channel multi-analog brake pressure sensor according to claim 2, characterized in that: The PCBA assembly (2) comprises a metal support ring (21) and a circular PCBA printed circuit board (22); the metal support ring (21) is sleeved on the outer periphery of the bottom plate of the metal sensitive element assembly (1); and the PCBA printed circuit board (22) is attached to the bottom plate of the metal sensitive element assembly (1).

4. The single-channel multi-analog brake pressure sensor according to claim 3, characterized in that: The outer diameter of the PCBA printed circuit board (22) is greater than the inner diameter of the metal support ring (21), and is supported by the metal support ring (21).

5. The single-channel multi-analog brake pressure sensor according to claim 3, characterized in that: A through hole (23) is provided at the center of a circular PCBA printed circuit board (22); four silicon chips (5) are located on a bottom plate in the area of ​​the through hole (23) and are electrically connected to the PCBA printed circuit board (22) via leads.

6. The single-channel multi-analog brake pressure sensor according to claim 4, characterized in that: A card interface (24) is provided on the PCBA printed circuit board (22) and the metal support ring (21), and the connector assembly (3) is engaged with the PCBA assembly (2) via the card interface (24).

7. The single-channel multi-analog brake pressure sensor according to claim 6, characterized in that: The connector assembly (3) comprises a base (31) and a clamping ring (32) connected to the base (31); three mounting holes are arranged on the base (31), and three groups of detection springs (4) are arranged in the holes.

8. The single-channel multi-analog brake pressure sensor according to claim 7, characterized in that: The length of the detection spring (4) is greater than the length of the connector assembly (3), and both ends of the spring extend out of the end of the base (31) and the end of the clamping ring (32), and the end of the detection spring (4) in the clamping ring (32) contacts the contact point on the PCBA printed circuit board (22).

9. The single-channel multi-analog brake pressure sensor according to claim 8, characterized in that: Two protruding latch tongues (33) are arranged at the bottom of the latch ring (32), and the latch tongues (33) match the card interfaces (24) provided on the PCBA printed circuit board (22) and the metal support ring (21).

10. The single-channel multi-analog brake pressure sensor according to claim 7, characterized in that: A cylindrical stretching piece (6) is arranged between the bottom of the metal sensitive element assembly (1) and the base (31) of the connector assembly (3); the stretching piece (6) covers the bottom plate of the metal sensitive element assembly (1), the PCBA assembly (2) and the clamping ring (32) of the connector assembly (3).

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