CN210554742U

CN210554742U - Automobile-used brake pedal displacement volume detecting system

Info

Publication number: CN210554742U
Application number: CN201921214336.2U
Authority: CN
Inventors: 张俊; 袁莉芬
Original assignee: Shenzhen Boyong Technology Co ltd
Current assignee: Shenzhen Boyong Technology Co ltd
Priority date: 2019-07-30
Filing date: 2019-07-30
Publication date: 2020-05-19
Anticipated expiration: 2029-07-30

Abstract

The utility model relates to the technical field of automobiles, in particular to a vehicle brake pedal displacement detection system; including brake helping hand system, brake helping hand system includes brake push rod and master cylinder push rod, including control circuit board and magnetic field evenly distributed's response magnet, and the two corresponds respectively and fixes on brake push rod and master cylinder push rod, the last integration of control circuit board has two sets of hall element of independent work, and two sets of hall element are the mirror image and distribute, the direction of response magnet is perpendicular or be on a parallel with hall element, hall element's hall chip is located the linear region of response magnet magnetic field intensity, and the perpendicular component distribution of response magnet on control circuit board is on hall element, the utility model discloses can accurately survey brake push rod's displacement based on hall effect to refer as brake helping hand dynamics.

Description

Automobile-used brake pedal displacement volume detecting system

Technical Field

The utility model relates to the field of automotive technology, concretely relates to automobile-used brake pedal displacement volume detecting system.

Background

The brake, also called braking, refers to an operation of stopping or reducing the speed of a locomotive, a vehicle, other transportation means, or a machine in operation, and the conventional vacuum brake booster basically realizes the operation principle as shown in fig. 1 and 2: when the brake pedal is stepped on, acting force acts on the brake push rod and the plunger, a gap between the brake push rod and the master cylinder push rod is eliminated, then the acting force is transmitted to the master cylinder push rod, and the master cylinder push rod moves forwards. The rear cylinder piston moves forward under the action of the main cylinder push rod, the pressure of the rear cylinder rises, the front cylinder piston is pushed to move forward against the elastic force of the front cylinder spring under the action of the rear cylinder pressure and the rear cylinder spring, and the pressure of the front cylinder rises accordingly, so that braking is completed.

Wherein when stepping down the footboard, footboard dynamics (displacement volume, acceleration measurement) is an important parameter in braking system, and it needs to be gathered by the accuracy to as the brake helping hand dynamics reference, be used for whole car ECU control vehicle to use simultaneously, consequently need design a car brake pedal displacement volume detecting system.

SUMMERY OF THE UTILITY MODEL

Solves the technical problem

To the above-mentioned shortcoming that prior art exists, the utility model provides an automobile-used brake pedal displacement volume detecting system can solve prior art's footboard dynamics (displacement volume, acceleration measurement) effectively and be an important parameter in the braking system, and it needs to be gathered by the accuracy to refer as brake helping hand dynamics, be used for the problem that whole car ECU control vehicle used simultaneously.

Technical scheme

In order to achieve the above purpose, the utility model discloses a following technical scheme realizes:

the brake pedal displacement detection system for the vehicle comprises a brake boosting system, wherein the brake boosting system comprises a brake push rod and a main cylinder push rod, and comprises a control circuit board and induction magnets with uniformly distributed magnetic fields, the control circuit board and the induction magnets are respectively and correspondingly fixed on the brake push rod and the main cylinder push rod, two sets of Hall elements working independently are integrated on the control circuit board, the two sets of Hall elements are distributed in a mirror image mode, the direction of the induction magnets is perpendicular to or parallel to the Hall elements, Hall chips of the Hall elements are located in a linear area of the magnetic field intensity of the induction magnets, and the perpendicular component of the induction magnets on the control circuit board is distributed on the Hall elements.

Furthermore, the brake push rod is connected with a plunger through a ball head at one end, and the plunger is coaxially connected with a main cylinder push rod through a guide hole.

Furthermore, the two sets of Hall elements are provided with electric isolation on the control circuit board.

Furthermore, the Hall chips of the two Hall elements are subjected to minimum processing on the premise that the linear distance of the control circuit board does not interfere with the normal work of the control circuit board.

Furthermore, the sensor detection area of the control circuit board is processed by electromagnetic shielding, so that the influence of external electromagnetic radiation on the Hall chip sampling is avoided.

Furthermore, when the induction magnet is fixed, the installation part made of non-magnetic conductive materials is adopted, so that the magnetic field distribution of the induction magnet is prevented from being influenced.

Furthermore, the induction magnet is made of high-quality magnetic materials such as samarium cobalt and the like, so that the consistency of the magnetic field strength among samples is ensured, the grade of the induction magnet is not lower than SH, and the magnet is not demagnetized at 150 ℃.

Advantageous effects

Adopt the utility model provides a technical scheme compares with known public technique, has following beneficial effect:

1. the utility model discloses based on hall effect is magnetoelectric effect, hall voltage changes along with the change of magnetic field intensity, through constructing one and the linear relation magnetic field of distance, detects hall voltage's change and acquires accurate brake push rod and remove the distance variation value, can regard as an important parameter to be gathered by the accuracy among the braking system to refer to as brake helping hand dynamics.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

FIG. 1 is a schematic view of the internal structure of the brake booster of the present invention;

FIG. 2 is a schematic structural view of the brake boosting system of the present invention;

fig. 3 is a schematic diagram of the directional distribution of the hall elements and the induction magnets of the present invention;

fig. 4 is a schematic diagram of the magnetic field direction distribution of the induction magnet of the present invention;

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The present invention will be further described with reference to the following examples.

Examples

The vehicle brake pedal displacement detection system of the embodiment refers to fig. 1 to 4: including brake helping hand system, brake helping hand system includes brake push rod and master cylinder push rod, including control circuit board and magnetic field evenly distributed's response magnet, and the two corresponds respectively and fixes on brake push rod and master cylinder push rod, the last integration of control circuit board has two sets of hall element of independent work, and two sets of hall element are the mirror image and distribute, the direction of response magnet is perpendicular or be on a parallel with hall element, hall element's hall chip is located the linear region of response magnet magnetic field intensity, and the vertical component distribution of response magnet on control circuit board is on hall element.

Wherein, brake push rod is connected with the plunger through the bulb of one end, the plunger has the main cylinder push rod through guiding hole coaxial coupling, and two sets of hall element are provided with electrical isolation on control circuit board, and two hall element's hall chip do minimum processing under the prerequisite that does not hinder control circuit board normal work at control circuit board's straight-line distance, control circuit board's sensor detection area adopts electromagnetic shield to handle, adopt the installed part by non-magnetic conductance material processing when induction magnet is fixed, induction magnet adopts high-quality magnetic material such as samarium cobalt, and its trade mark is not less than SH.

The working principle is as follows: as can be seen from the operating characteristics of the linear hall chip, the output (in various forms such as analog signal, PWM, digital signal, and the analog signal is taken as an example herein) of the linear hall chip has a linear relationship with the magnetic field strength, that is, Vout ═ a × B + B, B is the magnetic field strength, a and B are specific constants, which can be tested according to the application scenario, and at the same time, the magnetic field strength has a linear relationship with the distance L between the magnet and the hall chip, which can be described as B ═ a1 × L + B1. Wherein a1 and b1 are specific constants, which can be tested according to application scenarios. Therefore, Vout ═ a × B + B ═ a (a1 × L + B1) + B ═ a2 × L + B2, a2 and B2 are also constants; after the structure is installed, the stroke of the brake pedal is fixed, two data need to be tested for system calibration at the moment, when the pedal is completely released, the distance between the magnet and the Hall chip is measured to be L0, and the output of the Hall chip is Vout 0. When the pedal is stepped to the bottom, the distance between the magnet and the Hall chip is measured to be L1, the output of the Hall chip is Vout1, a linear formula Vout is substituted, wherein the linear formula Vout is a B + B is a 2L + B2, the values of a2 and B2 are obtained and stored in a system storage module, after the system enters a normal working state, a driver can operate the brake pedal according to needs, the motion of the pedal can push a brake push rod and a master cylinder push rod to carry out relative motion, and the displacement value L between the magnet and the Hall chip can slide between L0 and L1. The electronic brake control system or the whole vehicle ECU can calculate the current displacement value L by detecting the change of Vout and the values of a2 and b2, further adjust the power-assisted force of the electronic brake or other relevant operations of the whole vehicle, compare the outputs of the two Hall chips when reading the value L, and approve the output result if the outputs of the Hall chip 1 and the Hall chip 2 are consistent (the deviation is within the allowable range); if the two outputs are not consistent but are within the normal working range, outputting the average value and simultaneously reporting a fault; if one exceeds the normal working range, the other output is taken as the standard, and faults are reported simultaneously; if the normal working range is found out for both, the output is stopped and the fault is reported.

In addition, before the use, two Hall chips are respectively calibrated, the linear parameters a2 and b2 of the two Hall chips are independently recorded, the magnetic field intensity is consistent, the two Hall chips a2 and b2 are basically consistent, and the Hall outputs corresponding to the relative movement displacement L of the brake push rod and the master cylinder push rod are basically matched

Because this system is applied to car braking system, the reliability degree of its work has great influence to driver and passenger's personnel and vehicle safety of traveling, needs some functional safety designs, for example: the sensor detection area of the control circuit board is processed by electromagnetic shielding, so that the influence of external electromagnetic radiation on the Hall chip sampling is avoided; when the induction magnet is fixed, the installation piece made of non-magnetic conductive material is adopted, so that the magnetic field distribution of the induction magnet is prevented from being influenced; the induction magnet is made of high-quality magnetic materials such as samarium cobalt and the like, so that the consistency of the magnetic field strength among samples is ensured, the mark is not lower than SH, and the magnet is ensured not to be demagnetized at 150 ℃; wherein the electronic component needs to be processed as follows: two sets of Hall detection circuits which work independently are integrated on one circuit board, and the two sets of circuits are electrically isolated on the circuit board; the two sets of circuits are distributed in a mirror image mode, and the two Hall chips are as close as possible; the vertical component of the magnets on the circuit board is evenly distributed on the surfaces of the two Hall chips; structurally, when the brake push rod and the master cylinder push rod move to the maximum and minimum positions relatively, the two Hall chips are all in the linear area of the magnetic field intensity of the magnet.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. The utility model provides a car brake pedal displacement volume detecting system, includes brake helping hand system, brake helping hand system includes brake push rod and master cylinder push rod, its characterized in that: the control circuit board is integrated with two sets of Hall elements which work independently, the two sets of Hall elements are distributed in a mirror image mode, the direction of the induction magnet is perpendicular to or parallel to the Hall elements, Hall chips of the Hall elements are located in a linear area of the magnetic field intensity of the induction magnet, and the vertical component of the induction magnet on the control circuit board is distributed on the Hall elements.

2. The system for detecting the displacement of the brake pedal of the vehicle as claimed in claim 1, wherein the brake push rod is connected with a plunger through a ball head at one end, and the plunger is coaxially connected with a main cylinder push rod through a guide hole.

3. The system of claim 1, wherein the two hall elements are electrically isolated from each other on the control circuit board.

4. The system of claim 1, wherein the hall chips of the two hall elements are minimized without interfering with the normal operation of the control circuit board.

5. The system of claim 1, wherein the sensor detection area of the control circuit board is electromagnetically shielded.

6. The system of claim 1, wherein the sensor magnet is fixed by a mounting member made of a non-magnetically conductive material.

7. The system for detecting the amount of displacement of the brake pedal of the vehicle as claimed in claim 1, wherein the induction magnet is made of a high-quality magnetic material such as samarium cobalt and the like, and the mark number of the induction magnet is not lower than SH.