CN113720521B - Brake testing method based on piezoelectric effect - Google Patents
Brake testing method based on piezoelectric effect Download PDFInfo
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- CN113720521B CN113720521B CN202111088238.0A CN202111088238A CN113720521B CN 113720521 B CN113720521 B CN 113720521B CN 202111088238 A CN202111088238 A CN 202111088238A CN 113720521 B CN113720521 B CN 113720521B
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- 238000012360 testing method Methods 0.000 title claims abstract description 40
- 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 24
- 230000003247 decreasing effect Effects 0.000 claims description 4
- 238000010998 test method Methods 0.000 claims description 4
- 230000008054 signal transmission Effects 0.000 abstract description 2
- 230000033001 locomotion Effects 0.000 description 12
- 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
- 238000005516 engineering process Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 1
- 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
- 230000008569 process Effects 0.000 description 1
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Classifications
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- 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
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- 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
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- 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
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- 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
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- General Physics & Mathematics (AREA)
- Regulating Braking Force (AREA)
Abstract
The application 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 a two-way electromagnetic valve which is connected with a brake air path 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 application utilizes the homopolar repulsion principle and the piezoelectric effect principle of the permanent magnet, can accurately and rapidly measure the braking response time, the safe release time, the braking stroke, the actual braking frequency and the highest braking frequency of the brake, does not need to modify the brake, and has no time delay in signal transmission.
Description
Technical Field
The application 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 provides requirements on brake response time, automobile brake complete release time and the like. "7.1.6 automobile brake complete release time (time required from release of brake pedal to brake release) should be less than or equal to 0.8s for two-axis automobiles and less than or equal to 1.2s for three-axis and more. When the automobiles with pneumatic brakes and 7.2.10 are tested according to the method specified in GB12676, the response time from the step on of a brake pedal to the least favorable brake chamber is less than or equal to 0.6s, and the response time from the step on of the brake pedal to the extension of the pipeline end of a main inter-hook pneumatic control pipeline joint of the automobile with traction function is also less than or equal to 0.4s; when using a pneumatically braked trailer, the response time from the main inter-hitch pneumatic control line joint to the least favorable brake chamber should be less than or equal to 0.4s when tested as specified in GB 12676. "wherein the minimum time accuracy is 0.01s. The anti-lock braking system (ABS) has made higher demands on the response frequency of the brake, and particularly, with the development of intelligent technologies such as automatic driving of vehicles, the response requirement of an Automatic Emergency Braking System (AEBS) on the brake has reached the millisecond level. And whether it is a drum brake or a disc brake, the implementation of which includes a rigid and resilient mechanism, the testing of the maximum brake response frequency is a challenge.
The existing method is to measure the brake response time and the brake complete release time of the brake by measuring the pressure of the brake air chamber, and indirectly reflect the actual brake response effect of the brake; this method cannot further test the actual response time of the brake, the brake stroke, and the highest brake response frequency.
In addition, in the traditional detection method, a brake loop of a tested brake is required to be modified, an air pipe is connected to an interface of the brake loop or a cylinder and the like, and when a brake and release test is carried out, the dynamic air pressure change condition of the connected air pipe is tested. This affects the working effect of the brake to a certain extent, and due to the modification and operation differences of different detection mechanisms, the problem of non-uniform and inaccurate detection result dimensions can be caused.
Disclosure of Invention
For this purpose, the application provides a brake testing method based on the piezoelectric effect. According to the technical scheme of combining the homopolar repulsion principle of the permanent magnets and the piezoelectric effect, physical motion parameters of the brake wheel cylinder piston of the brake are represented as electric signals, the stroke of the brake wheel cylinder piston is dynamically detected in a non-contact mode, and the brake response time, the safe release time, the brake stroke, the actual brake frequency and the highest brake frequency of the brake can be accurately and quickly detected without modifying the structure of the brake.
Therefore, the technical scheme adopted by the application is as follows:
a maximum braking travel test method of a brake is characterized in that:
the method comprises the steps of setting a programmable controller and a two-way electromagnetic valve, wherein the two-way electromagnetic valve is connected to a braking air 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 corresponding relation between the piston stroke and the electric signal value generated by the piezoelectric element is established in advance through calibration;
during testing, the two-way electromagnetic valve is controlled to be opened through the programmable controller, so that the brake is braked, when the electric signal value generated by the piezoelectric element is continuously increased and then is kept stable, a 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 brake response time test method of a brake is characterized in that:
the method comprises the steps of setting a programmable controller and a two-way electromagnetic valve, wherein the two-way electromagnetic valve is connected to a braking air 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 two-way electromagnetic valve is controlled to be opened by the programmable controller to enable the brake to brake, and when the electric signal value generated by the piezoelectric element is continuously increased and then kept stable, the opening time t of the two-way electromagnetic valve is recorded o And the maximum electric signal value triggering time t of the piezoelectric element d Calculating the braking response time t r The following are provided:
t r ＝t d -t o (1)
a method for testing the brake release time of a brake is characterized by comprising the following steps:
the method comprises the steps of setting a programmable controller and a two-way electromagnetic valve, wherein the two-way electromagnetic valve is connected to a braking air 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 two-way electromagnetic valve is controlled to be opened through the programmable controller, so that the brake is braked, and after the brake reaches the maximum braking stroke, the two-way electromagnetic valve is controlled to be closed through the programmable controller, so that the brake stops braking; by recording the closing time t of the two-way electromagnetic valve c And a time t when the electric signal value of the piezoelectric element is restored to the initial value i Calculating the brake release time t of the brake s The following are provided:
t s ＝t i -t c (2)
a method for testing actual braking frequency and highest braking frequency of a brake is characterized by comprising the following steps:
the method comprises the steps of setting a programmable controller and a two-way electromagnetic valve, wherein the two-way electromagnetic valve is connected to a braking air 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) The two-way electromagnetic valve is controlled by the programmable controller to switch on and off the air circuit according to a certain fixed frequency lower than the highest braking frequency of the brake, the brake brakes and stops braking according to the fixed frequency, so that the piezoelectric element generates an electric signal, the number a of peaks or troughs of the electric signal generated by the piezoelectric element in a certain time period t is counted, and the actual braking frequency of the brake is obtained as follows:
f＝a/t (3)
2) The two-way electromagnetic valve is controlled by the programmable controller to be at a certain on-off frequency f 0 Carrying out on-off;
if the on-off frequency f of the two-way electromagnetic valve 0 The actual braking frequency f of the brake is less than or equal to f 0 Gradually increasing with T as increment step length until f 0 When +nT > f, f is taken 0 And + (n-1) T is the highest braking frequency of the brake;
if the on-off frequency f of the two-way electromagnetic valve 0 The actual braking frequency f of the brake, f 0 Gradually decreasing with T as decreasing step length until f 0 Taking f when nT is less than or equal to f 0 -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 are arranged, one is a movable permanent magnet and is connected with the outer end part of a brake cylinder piston; the other permanent magnet is fixed and connected to the piezoelectric element, and the two permanent magnets are homopolar and opposite.
Further, the piezoelectric element converts and outputs a signal to the programmable controller through the A/D converter. By adopting the technical scheme, compared with the prior art, the application has the following remarkable technical effects:
1. compared with a common brake testing method, the method has the advantages that the brake cylinder piston is 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 and practical and easy to realize.
2. Compared with the common brake testing method, the application has the advantages that the two permanent magnets are in non-contact connection between the piston and the piezoelectric element, the mechanical signals are converted into the magnetic signals and then are converted into the electric signals by utilizing the non-contact mutual exclusion principle and the piezoelectric effect principle of the two permanent magnets, the mechanical medium or the hydraulic medium is not used for conducting force, no process loss error exists, and the accuracy of the brake test is improved.
Meanwhile, no time delay exists in signal transmission, and the testing 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 application can accurately control the brake by arranging the programmable controller and the two-way electromagnetic valve to control the on-off of the air passage, and all electric signals can be fed back to the programmable controller, thereby being convenient for unified control and management.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the application, like reference numerals being used to refer to like parts throughout the several views.
FIG. 1 is a block diagram of a test system according to the present application.
Detailed Description
The present application will now be described in detail with reference to the accompanying drawings and examples, which form a part hereof, and which together with examples serve to illustrate the application. It will be appreciated by those skilled in the art that the following examples are not intended to limit the scope of the application, and any equivalent changes or modifications made within the spirit of the application should be considered as falling within the scope of the application.
As shown in fig. 1, in an embodiment, the application provides a testing system, which mainly adopts a scheme of combining homopolar repulsion of permanent magnets and piezoelectric effect, and the movement of a brake cylinder piston causes the change of the distance between two permanent magnets, further causes the change of repulsive force of the two permanent magnets, further causes the change of an electric signal generated by a piezoelectric element connected with the permanent magnets due to the piezoelectric effect, and finally characterizes the movement stroke of the brake cylinder piston as a continuous electric signal so as to measure the performance parameter of the brake.
Because the change of the movement stroke of the brake 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, the piezoelectric element can characterize the movement stroke of the brake cylinder piston as a continuous electric signal and also has a corresponding relation, and the movement stroke of the brake cylinder piston can be reflected by the electric signal generated by the piezoelectric element.
The structure of the system is as follows: the device 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 the 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 generating and air storing 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 cylinder piston 9 is moved in a telescopic manner; the brake permanent magnet 10 is arranged at the outer end part of the brake cylinder piston 9 and moves along with the brake cylinder piston 9; the fixed permanent magnet 11 is mounted 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 can generate repulsive force because of homopolar opposition, 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 a 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, namely a brake stroke test, a brake response time test, a safety release time test and a highest brake frequency test of the brake 5.
1. Brake travel test
When the programmable controller 3 controls the two-way electromagnetic valve 2 to be opened, the brake 5 brakes, the brake cylinder piston 9 moves outwards, and the movable permanent magnet 10 moves outwards further. The piezoelectric element 12 is further caused to generate an electrical signal due to the principle of operation of homopolar repulsion of the permanent magnets and the piezoelectric effect. Because the repulsive force of the movable permanent magnet 10 and the fixed permanent magnet 11 is positively correlated with the outward moving distance of the movable permanent magnet 10, and a one-to-one correspondence exists; the value of the outward displacement distance of the brake cylinder piston 9 determines the value of the electric signal generated by the piezoelectric element 12 and corresponds to one by one.
The maximum braking stroke test is performed by first calibrating the relationship between the stroke of the brake 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 cylinder piston 9 at a certain interval, and the movement interval is adjusted based on the test accuracy (for example, the movement interval is 0.01mm,0.1mm, etc.). Because the stroke of the brake cylinder piston 9 and the electric signal generated by the piezoelectric element 12 are in positive correlation and in one-to-one correspondence, when the brake cylinder piston 9 is in each stroke position, the electric signal correspondingly generated by the piezoelectric element 12 is recorded, and a relation graph of the stroke and the electric signal is established by a fitting method, and the relation graph can also be a table representing a quantitative relation; the relation between the stroke of the brake cylinder piston 9 and the electric signal generated by the piezoelectric element 12 is input into a programmable controller to complete calibration and then is used for later use.
During testing, the two-way electromagnetic valve is controlled to be opened through the programmable controller, so that the brake is braked, when the electric signal value generated by the piezoelectric element is continuously increased and then is kept stable, a 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
Programmable deviceWhen the controller 3 controls the two-way electromagnetic valve 2 to be opened, the brake 5 is braked, the brake cylinder piston 9 moves outwards, and the movable permanent magnet 10 moves outwards further; the piezoelectric element 12 is further caused to generate an electrical signal due to the principle of operation of homopolar repulsion of the permanent magnets and the piezoelectric effect. When the brake cylinder piston 9 moves outward to the maximum displacement, the piezoelectric element 12 is continuously increased to the maximum electrical signal. The time t for controlling the two-way electromagnetic valve 2 to be opened by the programmable controller 3 is recorded o And the trigger time t at which the piezoelectric element 12 reaches the maximum electrical signal d Calculating the braking response time t r 。
t r ＝t d –t o (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 after the brake cylinder piston 9 reaches the maximum braking stroke; the two-way electromagnetic valve 2 is controlled to be closed through the programmable controller 3, so that the brake 5 stops braking; recording the closing time t of the two-way electromagnetic valve 2 c And a time t at which the electrical signal of the piezoelectric element 12 is restored to the initial value from the maximum electrical signal i Calculating the brake release time t s The calculation formula is as follows:
t s ＝t i –t c (2)
4. actual brake frequency 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, the brake cylinder piston 9 performs reciprocating motion of outward movement and return at a certain frequency; further, the movable permanent magnet 10 performs reciprocating motion of outward movement and return at a certain frequency; further, the repulsive force of the moving permanent magnet 10 and the fixed permanent magnet 11 is changed according to a certain frequency; the piezoelectric element 12 is further caused to generate an electric signal that varies in accordance with the on-off frequency of the two-way electromagnetic valve 2.
Therefore, in the actual test, the programmable controller 3 controls the two-way electromagnetic 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, the actual setting frequency and the 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 tested brake 5, the brake 5 can respond to each braking action, brake and stop braking according to the frequency, the brake cylinder piston 9 reciprocates between an initial position and a maximum braking stroke position, the piezoelectric element 12 generates an electric signal similar to a sine signal, the number a of peaks or 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- -the actual braking frequency of the brake;
t- -test period(s);
a- -number of peaks or troughs in the test period.
Further, F is generally rounded up, and the rounded result F is taken as a test result:
F＝[f]
2) The programmable controller 3 has a certain on-off frequency f 0 The two-way electromagnetic valve 2 is controlled to be switched on and off:
if the on-off frequency f of the two-way electromagnetic valve 2 0 The actual braking frequency f of the brake 5 is less than or equal to the actual braking frequency f, and the on-off frequency of the two-way electromagnetic valve 2 can be gradually increased, so that f 0 Gradually increasing by taking T as an incremental step until the on-off frequency of the two-way electromagnetic valve 2 is increased to f 0 +nT，f 0 When +nT > f, the actual operating frequency f of the brake 5 does not keep pace with the on-off frequency of the two-way electromagnetic valve 2, and the brake 5 has no operating capacity, thus taking f 0 Frequency f of +nT preceding period 0 And + (n-1) T is the highest braking frequency of the brake 5; n is more than or equal to 1. The step T is typically taken as 1Hz.
If the on-off frequency f of the two-way electromagnetic valve 2 0 The actual braking frequency f of the brake 5 is greater than the braking frequency f of the two-way electromagnetic valve 2, the brake 5 does not keep pace with the on-off frequency of the two-way electromagnetic valve 2, the brake 5 does not work, the on-off frequency needs to be gradually reduced, and f is calculated 0 Gradually reducing by taking T as a step-down step length to be straightTo f 0 Taking f when nT is less than or equal to f 0 nT is the highest braking frequency of the brake 5.
Claims (6)
1. A maximum braking travel test method of a brake is characterized in that:
the method comprises the steps of setting a programmable controller and a two-way electromagnetic valve, wherein the two-way electromagnetic valve is connected to a braking air 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 corresponding relation between the piston stroke and the electric signal value generated by the piezoelectric element is established in advance through calibration;
during testing, the two-way electromagnetic valve is controlled to be opened through the programmable controller, so that the brake is braked, when the electric signal value generated by the piezoelectric element is continuously increased and then is kept stable, a 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 brake response time test method of a brake is characterized in that:
the method comprises the steps of setting a programmable controller and a two-way electromagnetic valve, wherein the two-way electromagnetic valve is connected to a braking air 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 two-way electromagnetic valve is controlled to be opened by the programmable controller to enable the brake to brake, and when the electric signal value generated by the piezoelectric element is continuously increased and then kept stable, the opening time t of the two-way electromagnetic valve is recorded o And the maximum electric signal value triggering time t of the piezoelectric element d Calculating the braking response time t r The following are provided:
t r ＝t d -t o (1)。
3. a method for testing the brake release time of a brake is characterized by comprising the following steps:
the method comprises the steps of setting a programmable controller and a two-way electromagnetic valve, wherein the two-way electromagnetic valve is connected to a braking air 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 two-way electromagnetic valve is controlled to be opened through the programmable controller, so that the brake is braked, and after the brake reaches the maximum braking stroke, the two-way electromagnetic valve is controlled to be closed through the programmable controller, so that the brake stops braking; by recording the closing time t of the two-way electromagnetic valve c And a time t when the electric signal value of the piezoelectric element is restored to the initial value i Calculating the brake release time t of the brake s The following are provided:
t s ＝t i -t c (2)。
4. a method for testing actual braking frequency and highest braking frequency of a brake is characterized by comprising the following steps:
the method comprises the steps of setting a programmable controller and a two-way electromagnetic valve, wherein the two-way electromagnetic valve is connected to a braking air 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) The two-way electromagnetic valve is controlled by the programmable controller to switch on and off the air circuit according to a certain fixed frequency lower than the highest braking frequency of the brake, the brake brakes and stops braking according to the fixed frequency, so that the piezoelectric element generates an electric signal, the number a of peaks or troughs of the electric signal generated by the piezoelectric element in a certain time period t is counted, and the actual braking frequency of the brake is obtained as follows:
f＝a/t (3)
2) The two-way electromagnetic valve is controlled by the programmable controller to be at a certain on-off frequency f 0 Carrying out on-off;
if the on-off frequency f of the two-way electromagnetic valve 0 The actual braking frequency f of the brake is less than or equal to f 0 Gradually increasing with T as increment step length until f 0 When +nT > f, f is taken 0 And + (n-1) T is the highest braking frequency of the brake;
if the on-off frequency f of the two-way electromagnetic valve 0 The actual braking frequency f of the brake, f 0 Gradually decreasing with T as decreasing step length until f 0 Taking f when nT is less than or equal to f 0 -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 are arranged, one is a movable permanent magnet and is connected with the outer end part of a brake cylinder piston; the other permanent magnet is fixed and connected to the piezoelectric element, and the two permanent magnets are homopolar and opposite.
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.
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|---|---|---|---|---|
| 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 |
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