CN116811828A

CN116811828A - Displacement sensor structure

Info

Publication number: CN116811828A
Application number: CN202310883215.1A
Authority: CN
Inventors: 隋巧梅; 邹常华; 梁宗友
Original assignee: DIAS Automotive Electronic Systems Co Ltd
Current assignee: DIAS Automotive Electronic Systems Co Ltd
Priority date: 2023-07-19
Filing date: 2023-07-19
Publication date: 2023-09-29

Abstract

The invention discloses a displacement sensor structure, which is used for an automobile electronic braking system and comprises the following components: the split magnet assembly is fixed on a push rod piston assembly of the automobile electronic brake system, can reciprocate in a blind hole on the HCU valve block along with the push rod piston assembly, and can change a magnetic field above the PTS-PCBA; PTS-PCBA, it is disposed in ECU shell under blind hole, it has Hall chip, it connects ECU-PCBA through the signal connection piece; an ECU-PCBA disposed in the ECU housing below the PTS-PCBA; the HCU valve block and the ECU housing are secured together. According to the invention, an independent Hall chip assembly is not required to be arranged, a large magnet in the prior art is optimized into two small magnets with N poles oppositely arranged, and the Hall chip and the ECU are integrated, so that the number of parts is reduced, the complexity of the process is reduced, and the matching precision of the sensor is improved.

Description

Displacement sensor structure

Technical Field

The invention relates to the field of automobiles, in particular to a displacement sensor structure for an electronic brake system of an automobile.

Background

In the electronic braking field of the existing market, in the stage of taking over the driver, the intention of the driver is required to be identified by a displacement sensor, and three structural modes mainly exist in the structure of the displacement sensor:

1. the first is a traditional external angular displacement sensor, which is characterized in that main parts, a Hall element, a magnet and the like are arranged on a pedal, the stepping angle of the pedal is judged through voltage signals of two potentiometers, and then the displacement of a push rod is converted according to the angle.

The pedal structure is needed to bear, the complexity of the pedal is increased, meanwhile, the conversion of the angle and the displacement is in an radian relation, the nonlinearity is caused, and the precision is relatively poor;

2. the second type is an inductance integrated displacement sensor, which comprises an induction coil PCB, an iron core and the like, is integrated into an electronic booster, and uses the electromagnetic induction principle to change the iron core into the change of the coil self-inductance L or the mutual inductance M, and then uses the electromagnetic induction principle to change the inductance MMeasuring circuitAnd converted into a variable output of voltage or current.

The sensor PCBA of the mode has larger size, is not beneficial to miniaturization design of products, and has low frequency response;

3. the third is a Hall type displacement sensor, mainly composed of Hall chip and magnet, the Hall chip senses the angle change of the magnetic field at the chip in the moving process of the magnet, the change is compared with the calibration value, and the current displacement is converted.

The prior Hall displacement sensor is widely applied, a large magnet is needed to be arranged in order to provide sufficient magnetic flux for facilitating chip identification, the Hall chip forms a small assembly independently, and then the Hall chip is connected with a main ECU through a spring contact and the like, so that the structure is relatively complex, the cost is high, and risks such as positioning precision, signal transmission and the like are involved.

Technical name description;

the HCU is an actuator of an electronic power-assisted brake system of a vehicle, and generally comprises a pressure increasing valve (normally open valve), a pressure reducing valve (normally closed valve), a master cylinder unit, a pressure building unit and the like.

PCBA is an acronym for english Printed Circuit Board Assembly, a printed circuit board, also called a printed circuit board, a printed wiring board.

PTS, english is Pedal Travel Sensor pedal displacement sensor.

Disclosure of Invention

In the summary section, a series of simplified form concepts are introduced that are all prior art simplifications in the section, which are described in further detail in the detailed description section. The summary of the invention is not intended to define the key features and essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

The invention aims to solve the technical problem of providing a displacement sensor structure based on a Hall type displacement sensor principle, which can reduce the number of parts of the displacement sensor and reduce the occupied space of the displacement sensor.

In order to solve the above technical problems, the present invention provides a displacement sensor structure for an electronic brake system of an automobile, comprising:

the split magnet assembly 2 is fixed on the push rod piston assembly 1 of the automobile electronic brake system, can reciprocate in the blind hole 8 on the HCU valve block 7 along with the push rod piston assembly 1, and can change the magnetic field above the PTS-PCBA 3;

PTS-PCBA3 disposed in ECU housing 6 below blind hole 8, having a Hall chip connected to ECU-PCBA5 by signal connector 4;

an ECU-PCBA5 disposed in the ECU housing 6 below the PTS-PCBA 3;

the HCU valve block 7 and the ECU housing 6 are fixed together.

Optionally, further improving the structure of the displacement sensor, the split magnet assembly 2 includes:

the two magnets with the same shape and size, the N poles are oppositely arranged on the same plane and are formed with a specified interval.

Alternatively, the displacement sensor structure is further improved, and two magnets are arranged along the axial direction of the push rod piston assembly 1 of the electronic brake system of the automobile.

Optionally, the structure of the displacement sensor is further improved, and the structure further comprises: a magnet bracket 9 arranged in parallel with the push rod piston assembly 1, a first end of which is formed with a first connecting portion 9.1, and a second end of which can be inserted into the blind hole 8 to reciprocate with the push rod piston assembly 1;

a first connection 9.1, which is located outside the blind hole 8, for connecting the fixed pushrod piston assembly 1;

the split magnet assembly 2 is arranged at a portion where the magnet holder 9 can be inserted into the blind hole.

Alternatively, the displacement sensor structure is further improved, and the magnet holder 9 is formed in a cylindrical shape.

Optionally, the displacement sensor structure is further improved, and the first connecting portion 9.1 is formed as a snap-fit structure capable of being snapped onto the first connecting portion 9.1.

Optionally, the displacement sensor structure is further improved, the magnet and the adjacent surface of the PTS-PCBA3 form a rectangular plane, and the PTS-PCBA3 is arranged in parallel with the rectangular plane of the magnet.

Optionally, the displacement sensor structure is further improved, and a designated air gap is formed between the magnet and the PTS-PCBA 3.

Optionally, the structure of the displacement sensor is further improved, and the structure further comprises: a recess 7.1 formed on the HCU valve block 7 below the blind hole 8 for receiving the boss 6.1 of the ECU housing 6;

PTS-PCBA3 is fixed in the boss 6.1. Other connection points of the ECU housing 6 and the HCU valve block 7 may be conventional connection fixing methods such as welding and screw fixing.

The working principle and the technical effects of the invention are further described as follows;

1. according to the invention, the Hall chip is arranged on the ECU shell 6 below the blind hole 8, the magnetic field is changed by the reciprocating motion of the split magnet assembly 2 in the blind hole, an independent Hall chip assembly is not required to be arranged, and the split magnet assembly is simple in structure and low in cost.

2. According to the invention, the PTS-PCBA3 is connected with the ECU-PCBA5 through the signal connecting piece 4, so that the Hall chip is integrated in the ECU, and the Hall chip and the ECU are integrated, thereby reducing the number of parts, reducing the complexity of the process and improving the matching precision of the sensor.

3. In order to ensure magnetic flux, the invention optimizes a large magnet in the prior art into two small magnets with N poles oppositely arranged, reduces manufacturing difficulty, increases identifiable displacement range and improves sensor matching precision.

It should be noted that the bulk magnet of the present invention refers to any one of the solutions of displacement sensors using one magnet in the prior art, and the structure of the present invention can be used to replace two relatively small (volume and smaller than the compared phase prior art) magnets on the premise of ensuring accurate identification.

Correspondingly, the blind holes are formed on the valve block, so that extra space is not required, and the two magnets can be arranged in a longer strip shape as far as possible within the allowable length of the valve block, and the magnetic induction is increased.

4. The invention designs a concave part 7.1 on the HCU valve block 7 below the blind hole 8, and the concave part 7.1 is used for accommodating the convex part 6.1 of the ECU shell 6; PTS-PCBA3 is fixed in convex part 6.1, and the design can ensure the required air gap of induction chip like this, can increase PTS-PCBA3 again and ECU-PCBA 5's connection fastness, avoid the signal transmission unstable that the vibration caused when being favorable to using.

Drawings

The accompanying drawings are intended to illustrate the general features of methods, structures and/or materials used in accordance with certain exemplary embodiments of the invention, and supplement the description in this specification. The drawings of the present invention, however, are schematic illustrations that are not to scale and, thus, may not be able to accurately reflect the precise structural or performance characteristics of any given embodiment, the present invention should not be construed as limiting or restricting the scope of the numerical values or attributes encompassed by the exemplary embodiments according to the present invention. The invention is described in further detail below with reference to the attached drawings and detailed description:

fig. 1 is a schematic diagram of the overall structure of the present invention.

Fig. 2 is a schematic view of the magnet arrangement of the present invention.

Description of the reference numerals

Push rod piston assembly 1

Split magnet assembly 2

PTS-PCBA3

Signal connector 4

ECU-PCBA5

ECU housing 6

Convex portion 6.1

HCU valve block 7

Recess 7.1

Blind hole 8

Magnet support 9

First connecting portion 9.1

Magnetic pole N, S

Length of magnet A

Distance between magnets B

And coordinate axis Z, X.

Detailed Description

Other advantages and technical effects of the present invention will become more fully apparent to those skilled in the art from the following disclosure, which is a detailed description of the present invention given by way of specific examples. The invention may be practiced or carried out in different embodiments, and details in this description may be applied from different points of view, without departing from the general inventive concept. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. The following exemplary embodiments of the present invention may be embodied in many different forms and should not be construed as limited to the specific embodiments set forth herein. It should be appreciated that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the technical solution of these exemplary embodiments to those skilled in the art. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present. In contrast, when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intervening elements present. Like reference numerals refer to like elements throughout the several views. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

A first embodiment;

referring to fig. 1, the present invention provides a displacement sensor structure for an electronic brake system of an automobile, comprising:

PTS-PCBA3 disposed in ECU housing 6 below blind hole 8, having a Hall chip connected to ECU-PCBA5 by signal connector 4; the signal connector 4 may employ a PIN needle;

an ECU-PCBA5 disposed in the ECU housing 6 below the PTS-PCBA 3;

the HCU valve block 7 and the ECU housing 6 are fixed together.

A second embodiment;

referring to fig. 1 in combination with fig. 2, the present invention provides a displacement sensor structure for an electronic brake system of an automobile, which is a further improvement based on the first embodiment, and the same parts are not repeated, including:

the split magnet assembly 2 includes:

the two magnets with the same shape and size and the N poles oppositely arranged on the same plane and formed with the specified interval are arranged along the axial direction of the push rod piston assembly 1 of the automobile electronic brake system.

A magnet bracket 9 arranged in parallel with the push rod piston assembly 1, a first end of which is formed with a first connecting portion 9.1, and a second end of which can be inserted into the blind hole 8 to reciprocate with the push rod piston assembly 1;

Alternatively, the magnet holder 9 is formed as a cylinder, and the first connection portion 9.1 is formed as a snap-fit structure that can be snapped onto the first connection portion 9.1.

Alternatively, the magnets and the PTS-PCBA3 are adjacently formed into rectangular planes, the PTS-PCBA3 is arranged in parallel with the rectangular planes of the magnets, and a designated air gap is formed between the magnets and the PTS-PCBA 3.

A third embodiment;

referring to fig. 1, the present invention provides a displacement sensor structure for an electronic brake system of an automobile, and the same parts will not be repeated, which is a further improvement on the basis of the first embodiment or the second embodiment, including:

a recess 7.1 formed on the HCU valve block 7 below the blind hole 8 for receiving the boss 6.1 of the ECU housing 6;

PTS-PCBA3 is fixed in the boss 6.1.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

The present invention has been described in detail by way of specific embodiments and examples, but these should not be construed as limiting the invention. Many variations and modifications may be made by one skilled in the art without departing from the principles of the invention, which is also considered to be within the scope of the invention.

Claims

1. A displacement sensor structure for an automotive electronic brake system, comprising:

the split type magnet assembly (2) is fixed on a push rod piston assembly (1) of the automobile electronic brake system, can reciprocate in a blind hole (8) on the HCU valve block (7) along with the push rod piston assembly (1), and can change a magnetic field above the PTS-PCBA (3);

PTS-PCBA (3) arranged in ECU housing (6) below blind hole (8) with Hall chip connected to ECU-PCBA (5) by signal connection (4);

an ECU-PCBA (5) disposed in the ECU housing (6) below the PTS-PCBA (3);

the HCU valve block (7) and the ECU shell (6) are fixed together.

2. The displacement sensor structure according to claim 1, wherein the split magnet assembly (2) comprises:

3. The displacement sensor structure of claim 2, wherein:

the two magnets are arranged along the axial direction of a push rod piston assembly (1) of the electronic brake system of the automobile.

4. The displacement sensor structure of claim 2, further comprising: a magnet bracket (9) which is arranged in parallel with the push rod piston assembly (1), a first end of which is provided with a first connecting part (9.1), and a second end of which can be inserted into the blind hole (8) to reciprocate along with the push rod piston assembly (1);

a first connecting part (9.1) which is positioned outside the blind hole (8) and is used for connecting and fixing the push rod piston assembly (1);

the split magnet assembly (2) is arranged at a part of the magnet support (9) which can be inserted into the blind hole.

5. The displacement sensor structure of claim 4, wherein: the magnet holder (9) is formed as a cylinder.

6. The displacement sensor structure of claim 4, wherein: the first connection part (9.1) is formed as a snap-in structure which can be snapped onto the first connection part (9.1).

7. The displacement sensor structure of claim 2, wherein: the surface of the magnet adjacent to the PTS-PCBA (3) is formed into a rectangular plane, and the PTS-PCBA (3) is arranged in parallel with the rectangular plane of the magnet.

8. The displacement sensor structure of claim 7, wherein: a designated air gap is formed between the magnet and the PTS-PCBA (3).

9. The displacement sensor structure of any one of claims 1-8, further comprising:

a recess (7.1) formed on the HCU valve block (7) below the blind hole (8) for accommodating the protrusion (6.1) of the ECU housing (6);

PTS-PCBA (3) is fixed in the convex part (6.1).