CN113720521A - Brake testing method based on piezoelectric effect - Google Patents
Brake testing method based on piezoelectric effect Download PDFInfo
- Publication number
- CN113720521A CN113720521A CN202111088238.0A CN202111088238A CN113720521A CN 113720521 A CN113720521 A CN 113720521A CN 202111088238 A CN202111088238 A CN 202111088238A CN 113720521 A CN113720521 A CN 113720521A
- Authority
- CN
- China
- Prior art keywords
- brake
- electromagnetic valve
- way electromagnetic
- piezoelectric element
- frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 41
- 230000000694 effects Effects 0.000 title abstract description 13
- 230000004044 response Effects 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims description 14
- 230000003247 decreasing effect Effects 0.000 claims description 6
- 238000010998 test method Methods 0.000 claims description 4
- 230000008054 signal transmission Effects 0.000 abstract description 2
- 230000033001 locomotion Effects 0.000 description 11
- 230000008859 change Effects 0.000 description 9
- 230000000875 corresponding effect Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000002596 correlated effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/28—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for testing brakes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/08—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of piezoelectric devices, i.e. electric circuits therefor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
Abstract
The invention provides a brake testing method based on piezoelectric effect, which is provided with a programmable controller and a two-way electromagnetic valve, wherein the programmable controller is connected with the two-way electromagnetic valve, and the two-way electromagnetic valve is connected on a brake gas circuit of a brake; a movable permanent magnet is arranged at the outer end part of a brake wheel cylinder piston of the brake; and a permanent magnet mounted on the piezoelectric element. The invention can accurately and rapidly measure the brake response time, the safe release time, the brake travel, the actual brake frequency and the highest brake frequency of the brake by utilizing the homopolar repulsion principle of the permanent magnet and the piezoelectric effect principle, does not need to modify the brake, and has no time delay in signal transmission.
Description
Technical Field
The invention relates to a brake testing technology, in particular to a brake frequency and brake stroke testing method.
Background
The national mandatory standard GB 7258-2017 motor vehicle operation safety technical condition puts requirements on brake response time, automobile brake complete release time and the like. "7.1.6 car brake complete release time (time required from brake pedal release to brake release) should be less than or equal to 0.8s for a two-axle car and less than or equal to 1.2s for a three-axle and above car. "7.2.10 adopts the car of air brake, when testing according to the method stipulated in GB12676, should be less than or equal to 0.6s from stepping on the brake pedal to the most unfavorable brake chamber response time, and should be less than or equal to 0.4s from stepping on the brake pedal to the response time of the main inter-hanger air pressure control pipeline joint extension pipeline end to the car with traction function; when the trailer adopting air braking is tested according to the method specified in GB12676, the response time from the air pressure control pipeline joint between the main hangers to the most unfavorable brake air chamber is less than or equal to 0.4 s. "where the minimum time accuracy is 0.01 s. Anti-lock brake system (ABS) puts higher demands on the response frequency of the brake, especially with the development of intelligent technologies such as automatic vehicle driving, the demand of the Automatic Emergency Brake System (AEBS) on the response of the brake reaches millisecond level. And whether the brake is a drum brake or a disc brake, the actuating part of the brake comprises a rigid and elastic mechanism, and the test consistency of the maximum brake response frequency is difficult.
The existing method detects the brake response time and the brake complete release time of a brake by measuring the pressure of a brake chamber, and indirectly reflects the actual brake response effect of the brake; this method does not further test the actual response time, brake travel, and maximum brake response frequency of the brake.
In addition, the conventional detection method needs to modify the brake circuit of the brake to be detected, generally, an air pipe is connected to the brake circuit or an interface at a position such as an air cylinder, and the dynamic air pressure change condition of the connected air pipe is tested when the brake and release tests are performed. The working effect of the brake is influenced to a certain extent, and the problems of inconsistent and inaccurate detection result scales can be caused due to the transformation differences and the operation differences of different detection mechanisms.
Disclosure of Invention
Therefore, the invention provides a brake testing method based on the piezoelectric effect. The invention utilizes the technical scheme of combining the homopolar repulsion principle of the permanent magnet and the piezoelectric effect to represent the physical motion parameters of the brake wheel cylinder piston of the brake as electric signals, dynamically detects the stroke of the brake wheel cylinder piston in a non-contact mode, and can accurately and quickly measure the brake response time, the safe release time, the brake stroke, the actual brake frequency and the highest brake frequency of the brake without modifying the structure of the brake.
Therefore, the technical scheme adopted by the invention is as follows:
a maximum braking stroke test method of a brake is characterized in that:
setting a programmable controller and a two-way electromagnetic valve, wherein the two-way electromagnetic valve is connected to a brake gas path of a brake, and the outer end part of a brake wheel cylinder piston of the brake is connected with a piezoelectric element;
establishing a corresponding relation between the piston stroke and an electric signal value generated by the piezoelectric element in advance through calibration;
during testing, the two-way electromagnetic valve is controlled to be opened through the programmable controller, so that the brake brakes, when the electric signal value generated by the piezoelectric element is kept stable after being continuously increased, the piston stroke value corresponding to the electric signal value kept stable is obtained according to the calibration relation, and the piston stroke value is the maximum braking stroke of the brake.
A method of testing a braking response time of a brake, characterized by:
setting a programmable controller and a two-way electromagnetic valve, wherein the two-way electromagnetic valve is connected to a brake gas path of a brake, and the outer end part of a brake wheel cylinder piston of the brake is connected with a piezoelectric element;
the programmable controller controls the two-way electromagnetic valve to be opened to brake the brake, and when the electric signal value generated by the piezoelectric element is kept stable after being continuously increased, the opening moment t of the two-way electromagnetic valve is recordedoAnd the maximum electrical signal value triggering time t of the piezoelectric elementdCalculating the brake response time trThe following are:
tr＝td-to (1)
a brake release time testing method of a brake is characterized in that:
setting a programmable controller and a two-way electromagnetic valve, wherein the two-way electromagnetic valve is connected to a brake gas path of a brake, and the outer end part of a brake wheel cylinder piston of the brake is connected with a piezoelectric element;
the programmable controller controls the two-way electromagnetic valve to be opened to brake the brake, and when the brake reaches the maximum braking stroke, the programmable controller controls the two-way electromagnetic valve to be closed to stop braking; by recording the closing time t of the two-way solenoid valvecAnd time t when the electric signal value of the piezoelectric element is restored to the initial valueiCalculating the brake release time tsThe following are:
ts＝ti-tc (2)
a method for testing the actual braking frequency and the highest braking frequency of a brake is characterized in that:
setting a programmable controller and a two-way electromagnetic valve, wherein the two-way electromagnetic valve is connected to a brake gas path of a brake, and the outer end part of a brake wheel cylinder piston of the brake is connected with a piezoelectric element;
1) controlling a two-way electromagnetic valve to switch on and switch off a gas circuit according to a certain fixed frequency lower than the highest braking frequency of a brake through a programmable controller, braking and stopping braking by the brake according to the fixed frequency, enabling a piezoelectric element to generate an electric signal, counting the number a of wave crests or wave troughs of the electric signal generated by the piezoelectric element in a certain time period t, and obtaining the actual braking frequency of the brake as follows:
f＝a/t (3)
2) controlling the two-way electromagnetic valve by a programmable controller to have a certain on-off frequency f0Switching on and off;
if the on-off frequency f of the two-way solenoid valve0Less than or equal to the actual braking frequency f of the brake, then f is0Gradually increasing by taking T as an increasing step length until f0When nT is greater than f, take f0+ (n-1) T is the maximum braking frequency of the brake;
if the on-off frequency f of the two-way solenoid valve0If the actual braking frequency f of the brake is higher, f will be0Gradually decreasing with T as decreasing step length until f0when-nT is less than or equal to f, take f0-nT is the highest braking frequency of the brake.
Further, the method for connecting the outer end part of the brake wheel cylinder piston with the piezoelectric element comprises the following steps: a pair of permanent magnets is arranged, one permanent magnet is a movable permanent magnet and is connected to the outer end part of a brake wheel cylinder piston; the other permanent magnet is a fixed permanent magnet and is connected to the piezoelectric element, and the two permanent magnets have the same poles opposite to each other.
Further, the piezoelectric element converts and outputs the signal to the programmable controller through the A/D converter. Due to the adoption of the technical scheme, compared with the prior art, the invention has the following remarkable technical effects:
1. compared with the common brake testing method, the invention has the advantages that the brake wheel cylinder piston is arranged to be connected with the piezoelectric element, the displacement signal of the piston is converted into the electric signal to test the related performance of the brake, the original structure of the brake is not required to be changed, and the method is simple, practical and easy to realize.
2. Compared with the common brake testing method, the invention has the advantages that the two permanent magnets are connected between the piston and the piezoelectric element in a non-contact manner, the non-contact mutual exclusion principle and the piezoelectric effect principle of the two permanent magnets are utilized, the mechanical signal is converted into the magnetic signal and then converted into the electric signal, the force is conducted without the aid of a mechanical medium or a hydraulic medium, no process loss error exists, and the brake testing accuracy is improved.
Meanwhile, signal transmission has no time delay, and the test accuracy of the brake stroke, the brake response time, the brake release time and the brake frequency of the brake is greatly improved.
3. Compared with the common brake testing method, the invention controls the on-off of the gas path by setting the programmable controller and the two-way electromagnetic valve, can accurately control the brake, and all electric signals can be fed back to the programmable controller, thereby facilitating the unified control and management.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.
FIG. 1 is a block diagram of a test system according to the present invention.
Detailed Description
The invention is described in detail below with reference to the drawings, which form a part hereof, and which are shown by way of illustration, embodiments of the invention. However, it should be understood by those skilled in the art that the following examples are not intended to limit the scope of the present invention, and any equivalent changes or modifications made within the spirit of the present invention should be considered as falling within the scope of the present invention.
As shown in fig. 1, in an embodiment, the present invention provides a set of test system, which mainly adopts a scheme of combining homopolar repulsion of permanent magnets and piezoelectric effect, and through the movement of a brake wheel cylinder piston, the distance between two permanent magnets is caused to change, further the repulsion of two permanent magnets is caused to change, further a piezoelectric element connected with the permanent magnets is caused to generate a change of an electric signal due to the piezoelectric effect, and finally the movement stroke of the brake wheel cylinder piston is characterized as a continuous electric signal, so as to measure the performance parameter of the brake.
The change of the motion stroke of the brake wheel cylinder piston corresponds to the change of the distance between the two permanent magnets one by one, the distance between the two permanent magnets corresponds to the repulsive force generated by the two permanent magnets one by one, and the repulsive force of the two permanent magnets corresponds to the electric signal generated by the piezoelectric element one by one, so that the piezoelectric element can represent the motion stroke of the brake wheel cylinder piston as a continuous electric signal and also has a corresponding relation, and the motion stroke of the brake wheel cylinder piston can be reflected by the electric signal generated by the piezoelectric element.
The structure of the system is as follows: the pneumatic brake system comprises an air pressure generating and storing device 1, wherein the air pressure generating and storing device 1 is connected with a brake 5 through an air passage 4, and a two-way electromagnetic valve 2 is arranged on the air passage; the two-way electromagnetic valve 2 is controlled by a programmable controller 3, and when the valve of the two-way electromagnetic valve 2 is opened or closed, the brake 5 is braked or stopped by the action of the air pressure generation and air storage device 1.
Further, the programmable controller 3 can control the on-off frequency of the two-way electromagnetic valve 2, and further control the braking frequency of the brake 5.
When the brake 5 performs a braking operation, the brake wheel cylinder piston 9 is moved in an extending and contracting manner; the movable permanent magnet 10 is arranged at the outer end part of the brake wheel cylinder piston 9 and moves together with the brake wheel cylinder piston 9; the fixed permanent magnet 11 is arranged on the piezoelectric element 12; the homopolar axes of the movable permanent magnet 10 and the fixed permanent magnet 11 are opposite, and the fixed permanent magnet 11 and the movable permanent magnet 10 are opposite in homopolar, so that a repulsive force can be generated, and the generated repulsive force also changes along with the change of the distance between the two permanent magnets. The repulsive force of the moving permanent magnet 10 received by the fixed permanent magnet 11 acts on the piezoelectric element 12, so that the piezoelectric element 12 generates an electric induction signal, and the change of the repulsive force generates the change of an electric signal. The piezoelectric element 12 converts the signal by the a/D converter 13 and outputs the converted signal.
The programmable controller 3 can preset four test modes, which are a brake stroke test, a brake response time test, a safety release time test and a maximum brake frequency test of the brake 5.
1. Brake stroke test
When the programmable controller 3 controls the two-way electromagnetic valve 2 to be opened, the brake 5 brakes, the brake wheel cylinder piston 9 moves outwards, and the movable permanent magnet 10 further moves outwards. Due to the working principle of homopolar repulsion and piezoelectric effect of the permanent magnet, the piezoelectric element 12 is further caused to generate an electric signal. The repulsive force of the movable permanent magnet 10 and the fixed permanent magnet 11 is positively correlated with the outward displacement distance of the movable permanent magnet 10, and a one-to-one correspondence exists; the value of the outward movement distance of the brake wheel cylinder piston 9 determines the value of the electric signal generated by the piezoelectric element 12, and corresponds to one another.
The maximum braking stroke test needs to calibrate the relationship between the stroke of the brake wheel cylinder piston 9 and the electric signal generated by the piezoelectric element 12. The calibration method comprises the following steps:
the brake 5 is moved from the initial state to the maximum stroke state of the brake wheel cylinder piston 9 at certain intervals, and the movement intervals are adjusted based on the test precision (for example, the movement intervals are 0.01mm, 0.1mm and the like). Because the stroke of the brake wheel cylinder piston 9 and the electric signal generated by the piezoelectric element 12 are in positive correlation and in one-to-one correspondence relationship, when the brake wheel cylinder piston 9 is at each stroke position, the electric signal generated by the piezoelectric element 12 correspondingly is recorded, and a relationship curve graph of the two is established by a fitting method, or the relationship curve graph can be a table representing quantitative relationship; and inputting the relation between the stroke of the brake wheel cylinder piston 9 and the electric signal generated by the piezoelectric element 12 into a programmable controller to finish calibration and later use.
During testing, the two-way electromagnetic valve is controlled to be opened through the programmable controller, so that the brake brakes, when the electric signal value generated by the piezoelectric element is kept stable after being continuously increased, the piston stroke value corresponding to the electric signal value kept stable is obtained according to the calibration relation, and the piston stroke value is the maximum braking stroke of the brake.
2. Brake response time test
When the programmable controller 3 controls the two-way electromagnetic valve 2 to be opened, the brake 5 is braked, the brake wheel cylinder piston 9 moves outwards, and the movable permanent magnet 10 further moves outwards; due to the working principle of homopolar repulsion and piezoelectric effect of the permanent magnet, the piezoelectric element 12 is further caused to generate an electric signal. When the brake wheel cylinder piston 9 moves outwards to the maximum displacement, the generated electric signal of the piezoelectric element 12 is increased to the maximum. The moment t of opening of the two-way electromagnetic valve 2 is controlled by the recording programmable controller 3oAnd the triggering time t at which the piezoelectric element 12 reaches the maximum electrical signaldCalculating the brake response time tr。
tr＝td–to (1)
3. Brake release time test
When the programmable controller 3 controls the two-way electromagnetic valve 2 to be opened, the brake 5 brakes, and the brake wheel cylinder piston 9 reaches the maximum brake stroke; the programmable controller 3 controls the two-way electromagnetic valve 2 to be closed, so that the brake 5 stops braking; recording the time t at which the two-way solenoid valve 2 is closedcAnd a time t at which the electric signal of the piezoelectric element 12 is restored from the maximum electric signal to the initial valueiCalculating the brake release time tsThe calculation formula is as follows:
ts＝ti–tc (2)
4. actual and maximum brake frequency test
The programmable controller 3 controls the two-way electromagnetic valve 2 to be switched on and off at a certain frequency, and further enables the brake 5 to brake and stop braking at a certain frequency; further making the brake wheel cylinder piston 9 perform outward and return reciprocating motion at a certain frequency; further making the permanent magnet 10 perform reciprocating motion of moving outwards and returning back at a certain frequency; further causing the movable permanent magnet 10 and the fixed permanent magnet 11 to generate a repulsive force varying according to a certain frequency; further, the piezoelectric element 12 generates an electric signal that changes in accordance with the on-off frequency of the two-way solenoid valve 2.
Therefore, in an actual test, the programmable controller 3 controls the two-way solenoid valve 2 to perform tests with different on-off frequencies, and by comparing the on-off frequency with the variation frequency of the electric signal generated by the piezoelectric element 12, an actual set frequency and a highest braking frequency of the brake 5 can be obtained.
1) When the two-way electromagnetic valve 2 is controlled by the programmable controller 3 to switch on and off the air circuit according to a certain fixed frequency lower than the highest braking frequency of the brake 5 to be tested, the brake 5 can respond to each braking action, braking and stopping braking are carried out according to the frequency, the brake wheel cylinder piston 9 reciprocates between the initial position and the maximum braking stroke position, so that the piezoelectric element 12 generates an electric signal similar to a sinusoidal signal, the number a of wave crests or wave troughs of the electric signal generated by the piezoelectric element 12 in a certain time period t is counted, and the actual braking frequency of the brake 5 is obtained as follows:
f＝a/t (3)
wherein, f is the actual braking frequency of the brake;
t- -test time period(s);
a- -the number of peaks or valleys in the test period.
Further, F is generally rounded up, and the rounding result F is taken as the test result:
F＝[f]
2) the programmable controller 3 being operated at a certain switching frequency f0Controlling the two-way electromagnetic valve 2 to be switched on and off:
if the on-off frequency f of the two-way electromagnetic valve 20The actual braking frequency f of the brake 5 is less than or equal to, the on-off frequency of the two-way electromagnetic valve 2 can be gradually increased, and then f is set0Gradually increasing by taking T as an increasing step until the on-off frequency of the two-way electromagnetic valve 2 is increased to f0+nT，f0When + nT > f, the actual working frequency f of the brake 5 cannot keep up with the on-off frequency of the two-way electromagnetic valve 2, and the brake 5 has no working capacity, so that f is taken0Frequency f of + nT previous period0+ (n-1) T is the maximum braking frequency of the brake 5; n is more than or equal to 1. The step length T is typically 1 Hz.
If the on-off frequency f of the two-way electromagnetic valve 20If the actual braking frequency f of the brake 5 is higher than the on-off frequency of the two-way electromagnetic valve 2, the braking frequency of the brake 5 cannot keep up with the on-off frequency of the two-way electromagnetic valve 2, the brake 5 cannot work, and the on-off frequency needs to be gradually reduced, so that f is set0Gradually decreasing with T as decreasing step length until f0when-nT is less than or equal to f, take f0-nT is the highest braking frequency of the brake 5.
Claims (6)
1. A maximum braking stroke test method of a brake is characterized in that:
setting a programmable controller and a two-way electromagnetic valve, wherein the two-way electromagnetic valve is connected to a brake gas path of a brake, and the outer end part of a brake wheel cylinder piston of the brake is connected with a piezoelectric element;
establishing a corresponding relation between the piston stroke and an electric signal value generated by the piezoelectric element in advance through calibration;
during testing, the two-way electromagnetic valve is controlled to be opened through the programmable controller, so that the brake brakes, when the electric signal value generated by the piezoelectric element is kept stable after being continuously increased, the piston stroke value corresponding to the electric signal value kept stable is obtained according to the calibration relation, and the piston stroke value is the maximum braking stroke of the brake.
2. A method of testing a braking response time of a brake, characterized by:
setting a programmable controller and a two-way electromagnetic valve, wherein the two-way electromagnetic valve is connected to a brake gas path of a brake, and the outer end part of a brake wheel cylinder piston of the brake is connected with a piezoelectric element;
the programmable controller controls the two-way electromagnetic valve to be opened to brake the brake, and when the electric signal value generated by the piezoelectric element is kept stable after being continuously increased, the opening moment t of the two-way electromagnetic valve is recordedoAnd the maximum electrical signal value triggering time t of the piezoelectric elementdCalculating the brake response time trThe following are:
tr＝td-to (1)。
3. a brake release time testing method of a brake is characterized in that:
setting a programmable controller and a two-way electromagnetic valve, wherein the two-way electromagnetic valve is connected to a brake gas path of a brake, and the outer end part of a brake wheel cylinder piston of the brake is connected with a piezoelectric element;
the programmable controller controls the two-way electromagnetic valve to be opened to brake the brake, and when the brake reaches the maximum braking stroke, the programmable controller controls the two-way electromagnetic valve to be closed to stop braking; by recording the closing time t of the two-way solenoid valvecAnd time t when the electric signal value of the piezoelectric element is restored to the initial valueiCalculating the brake release time tsThe following are:
ts＝ti-tc (2)。
4. a method for testing the actual braking frequency and the highest braking frequency of a brake is characterized in that:
setting a programmable controller and a two-way electromagnetic valve, wherein the two-way electromagnetic valve is connected to a brake gas path of a brake, and the outer end part of a brake wheel cylinder piston of the brake is connected with a piezoelectric element;
1) controlling a two-way electromagnetic valve to switch on and switch off a gas circuit according to a certain fixed frequency lower than the highest braking frequency of a brake through a programmable controller, braking and stopping braking by the brake according to the fixed frequency, enabling a piezoelectric element to generate an electric signal, counting the number a of wave crests or wave troughs of the electric signal generated by the piezoelectric element in a certain time period t, and obtaining the actual braking frequency of the brake as follows:
f＝a/t (3)
2) controlling the two-way electromagnetic valve by a programmable controller to have a certain on-off frequency f0Switching on and off;
if the on-off frequency f of the two-way solenoid valve0Less than or equal to the actual braking frequency f of the brake, then f is0Gradually increasing by taking T as an increasing step length until f0When nT is greater than f, take f0+ (n-1) T is the maximum braking frequency of the brake;
if the on-off frequency f of the two-way solenoid valve0If the actual braking frequency f of the brake is higher, f will be0Gradually decreasing with T as decreasing step length until f0when-nT is less than or equal to f, take f0-nT is the highest braking frequency of the brake.
5. The method according to any one of claims 1-4, wherein:
the method for connecting the outer end part of the brake wheel cylinder piston with the piezoelectric element comprises the following steps: a pair of permanent magnets is arranged, one permanent magnet is a movable permanent magnet and is connected to the outer end part of a brake wheel cylinder piston; the other permanent magnet is a fixed permanent magnet and is connected to the piezoelectric element, and the two permanent magnets have the same poles opposite to each other.
6. The method according to any one of claims 1-4, wherein: the piezoelectric element converts and outputs signals to the programmable controller through the A/D converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111088238.0A CN113720521B (en) | 2021-09-16 | 2021-09-16 | Brake testing method based on piezoelectric effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111088238.0A CN113720521B (en) | 2021-09-16 | 2021-09-16 | Brake testing method based on piezoelectric effect |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113720521A true CN113720521A (en) | 2021-11-30 |
| CN113720521B CN113720521B (en) | 2023-11-17 |
Family
ID=78684395
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111088238.0A Active CN113720521B (en) | 2021-09-16 | 2021-09-16 | Brake testing method based on piezoelectric effect |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113720521B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4062224A (en) * | 1976-06-28 | 1977-12-13 | Nucleus Corporation | Brake tester |
| CN1447103A (en) * | 2003-03-20 | 2003-10-08 | 武汉理工大学 | Test bench for dispensing pumps of disk brake of motor |
| US6754568B1 (en) * | 2001-03-16 | 2004-06-22 | Bendix Commercial Vehicle Systems Llc | Brake response analysis system |
| CN102393295A (en) * | 2011-09-08 | 2012-03-28 | 浙江九隆机械有限公司 | Testing device of braker |
| EP2514650A2 (en) * | 2010-11-18 | 2012-10-24 | ÖBB - Technische Services GmbH | Air pressure measuring device |
| CN105783689A (en) * | 2016-04-26 | 2016-07-20 | 高金 | Non-contact type magnetic force piezoelectric displacement sensor |
| CN106979734A (en) * | 2016-01-19 | 2017-07-25 | 阿文美驰技术有限责任公司 | Survey tool and the method for measuring braking distance |
| CN211147920U (en) * | 2019-10-14 | 2020-07-31 | 交通运输部公路科学研究所 | Static brake pressure test system of semitrailer |
-
2021
- 2021-09-16 CN CN202111088238.0A patent/CN113720521B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4062224A (en) * | 1976-06-28 | 1977-12-13 | Nucleus Corporation | Brake tester |
| US6754568B1 (en) * | 2001-03-16 | 2004-06-22 | Bendix Commercial Vehicle Systems Llc | Brake response analysis system |
| CN1447103A (en) * | 2003-03-20 | 2003-10-08 | 武汉理工大学 | Test bench for dispensing pumps of disk brake of motor |
| EP2514650A2 (en) * | 2010-11-18 | 2012-10-24 | ÖBB - Technische Services GmbH | Air pressure measuring device |
| CN102393295A (en) * | 2011-09-08 | 2012-03-28 | 浙江九隆机械有限公司 | Testing device of braker |
| CN106979734A (en) * | 2016-01-19 | 2017-07-25 | 阿文美驰技术有限责任公司 | Survey tool and the method for measuring braking distance |
| CN105783689A (en) * | 2016-04-26 | 2016-07-20 | 高金 | Non-contact type magnetic force piezoelectric displacement sensor |
| CN211147920U (en) * | 2019-10-14 | 2020-07-31 | 交通运输部公路科学研究所 | Static brake pressure test system of semitrailer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113720521B (en) | 2023-11-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112477831B (en) | Brake control system, method and railway vehicle | |
| KR20110095334A (en) | Operation of a brake booster as a pedal simulator and brake booster of corresponding design | |
| GB0103063D0 (en) | Apparatus for testing operation of an emergency valve | |
| US11802631B2 (en) | Diagnostic device, system and method | |
| CN113720521A (en) | Brake testing method based on piezoelectric effect | |
| CN111751097A (en) | Method for testing liquid amount required by automobile brake | |
| CN215865603U (en) | Brake test system based on piezoelectric effect | |
| CN109131275A (en) | A kind of automobile automatic brake system and method | |
| KR20150022439A (en) | Electric Booster type Brake System and control method thereof | |
| JPS5850902B2 (en) | Atsuriyokubaitai De Sousarel | |
| CN104296954A (en) | Automatic detection method for railway vehicle brake valve spring performance | |
| JP3626234B2 (en) | Cylinder positioning control method | |
| JPS62186302A (en) | Adjustor | |
| Bowlin et al. | Pressure control scheme for air brakes in commercial vehicles | |
| Dülk et al. | Modelling of a linear proportional electromagnetic actuator and possibilities of sensorless plunger position estimation | |
| KR20040071237A (en) | Method for determining the clutch application point | |
| CN1136008A (en) | Servo control for hydraulic elevator | |
| CN105473394A (en) | Driver braking demand indicator apparatus for heavy vehicle | |
| CN102596598B (en) | Device for the sensor-based detection of a pressure difference in a working line through which compressed air flows | |
| CN215448476U (en) | Brake master cylinder load simulation device in line control braking system | |
| CN111929056A (en) | Sealing member motion resistance testing device | |
| CN113848069B (en) | Brake frequency testing method for brake | |
| CN205506366U (en) | Pneumatic brake control system | |
| CN102213278A (en) | Method for controlling an automated clutch | |
| CN107748511B (en) | Pneumatic position control system based on four-switch valve simultaneous opening strategy |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |