CN112477839A - Reluctance type automobile brake pad thickness detection structure - Google Patents
Reluctance type automobile brake pad thickness detection structure Download PDFInfo
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- CN112477839A CN112477839A CN202110024662.2A CN202110024662A CN112477839A CN 112477839 A CN112477839 A CN 112477839A CN 202110024662 A CN202110024662 A CN 202110024662A CN 112477839 A CN112477839 A CN 112477839A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
- B60T17/22—Devices for monitoring or checking brake systems; Signal devices
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- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
The invention discloses a detection structure of the thickness of a reluctance type automobile brake pad, belonging to the field of automatic detection and control of an automobile brake system. The brake pad of the invention is provided with two electromagnetic sensors on both sides, which are connected with a power supply and an output module, when the thickness data of the brake pad is sampled, the magnetic flux change induced in a conductor is measured, the electromagnetic sensors convert the measured value into the change of the mutual inductance coefficient M of a coil by utilizing the electromagnetic induction principle, and then the change is converted into the output of current by a measuring circuit, when the brake pad is worn, the thickness is reduced to reduce the magnetic resistance, the change of the corresponding magnetic conductivity is detected according to the change of the thickness of the brake pad, the electromagnetic signals are converted into current signals, the receiver receives the voltage signals of the resistance and is processed by a single chip microcomputer, and finally the thickness information of the brake pad is displayed on a. The invention has high measurement precision, can adapt to different temperatures, has smaller error, can provide more key information and greatly improves the safety of drivers.
Description
Technical Field
The invention belongs to the field of automatic detection and control of an automobile brake system, and particularly relates to a real-time detection system and an alarm method for the thickness of an automobile brake pad.
Background
The existing brake block detection system has the measurement accuracy of more than 2mm and lacks timeliness, when an automobile runs at a high speed, a part of kinetic energy is converted into heat energy during braking along with the fact that a driver steps on a brake pedal, the brake block is heated rapidly, and the existing brake block detection technology cannot eliminate temperature errors, so that the measurement of the thickness of the brake block is greatly deviated. The electromagnetic sensor has temperature stability, the detection circuit is excited by adopting constant-frequency and constant-amplitude current signals, and when the relative distance between a detected body and a sensor detection probe is changed, the detection body and a detected body eddy current ringIs changed to thereby cause an output signal U1And (4) changing. The electromagnetic sensor of the invention adopts a double-probe differential compensation mode, and the current measuring range of the electromagnetic sensor reaches 1mm and the temperature coefficient reaches 2 multiplied by 10 by taking measures such as optimizing the coil wire diameter and the like-4The temperature stability of the electromagnetic sensor is effectively improved, so that the measurement accuracy is improved.
Disclosure of Invention
In order to solve the technical problems, the invention provides a reluctance type automobile brake pad thickness online detection device which can help a driver to conveniently, quickly and accurately detect the thickness of a brake pad.
In order to achieve the purpose, the invention adopts the following technical scheme:
the on-line detection method for the thickness of the reluctance type automobile brake pad comprises a brake disc, the brake pad, brake calipers, a piston, a brake oil pipe, a brake oil pump, a brake pedal, a resistor, an electromagnetic sensor, a single chip microcomputer, a signal processing system and a display module. The electromagnetic sensor layout is carried out to four wheels of car, and the electromagnetic sensor horizontal symmetry arranges in the both sides of brake block, and the electromagnetic sensor probe is in close contact with brake block both sides. When the brake pad is worn, the change of the thickness of the brake pad can cause the change of the magnetic conductance performance, the probe of the electromagnetic sensor converts the magnetic conductance signal into a current signal to be input into a circuit, and finally the current signal is converted into a voltage signal by the loop resistance and is submitted to the display module through the processing of the singlechip. The circuit of the electromagnetic sensor needs to be connected with a 36V power supply, and the 36V power supply passes through a switch S1 connected with an ignition device of the automobile and a resistor R1Are connected in series and are connected with the singlechip through pins; the power supply end of the signal processing module is also connected with the switch S1 in series, the signal processing module processes signals after a driver steps on the brake pedal, in addition, for the purpose of saving electric energy, a delay closing switch S2 connected with the brake pedal is added in the thickness detection device to be used as a selection switch for detecting whether the thickness is detected, after the switch S2 is closed once, the situation that the driver steps on the brake pedal again within 20min is set, the switch S2 is not closed again, and the situation that the frequent brake of the driver on a congested road section causes frequent work of the detection device is preventedTherefore, the service life can be effectively prolonged and the electric energy can be saved. The display screen is connected with the singlechip, and an audible and visual alarm device is arranged at the output end.
The invention discloses an online detection method of the thickness of a reluctance type automobile brake pad, which comprises the following steps:
1) acquiring an electromagnetic signal:
when the driver presses the brake pedal and presses the vehicle start button to start the vehicle, the electromagnetic sensor power switch S1 and the power switch S2 of the signal processing module are closed, and the electromagnetic sensor and the signal processing module enter a working state.
1) Processing thickness signal data:
converting the current signal obtained in the step 1) into a voltage signal through an end resistor R1 of the electromagnetic sensor circuit, inputting the voltage signal into a signal processing module for processing, converting the voltage signal into a distance value d according to a calibration value of the electromagnetic sensor, wherein the distance value d is the distance between the surface of a probe of the electromagnetic sensor and the side surface of the brake pad when the electromagnetic sensor is in contact with the brake pad, and is the real-time thickness h of the brake pad;
3) data display and audible and visual alarm:
the brake pad thickness measurement can be realized by fully utilizing the electromagnetic thickness measurement principle by utilizing the existing higher-precision electromagnetic transceiving module and a matched singlechip structure in the market, and the real-time thickness h signals of eight brake pads of the four wheels of the left front, the right front, the left back and the right back of the automobile, which are obtained by processing in the step 2), are displayed by a display module; and the signal processing module is used for comparing the real-time thickness h of the eight brake pads with a set value h0Comparing, when one of the real-time thickness h is equal to or less than the set value h0And the signal processing module controls the sound and light alarm device to give out alarm sound and warning light for reminding.
The beneficial technical effects brought by the invention
(1) According to the thickness detection structure of the reluctance type automobile brake pad, two electromagnetic sensors are arranged on the brake calipers of the front left wheel, the front right wheel, the rear left wheel and the rear right wheel of an automobile, the magnetic conductivity of a composite ferromagnetic material brake disc is ingeniously utilized, the electromagnetic sensors are adopted to directly measure the change of the magnetic conductivity of the brake pad caused by the thickness change when the brake pad contacts the brake disc, the change of the thickness of the brake pad is further calculated, namely the effective utilization thickness of the brake pad, and the detection precision is high. Compared with the brake pad thickness detection system with the measurement precision of more than 2mm in the market, the invention has obvious advantages.
(2) According to the thickness detection structure of the reluctance type automobile brake pad, the temperature change caused by braking of the brake pad has small influence on measurement, and the temperature stability is realized.
(3) According to the reluctance type automobile brake pad thickness detection structure, the electromagnetic sensor can accurately detect the thickness quantization information of the brake pad, the brake pad does not need to be customized or modified, the electromagnetic sensor does not need to be replaced when the brake pad is replaced, and the universality is good; compared with a brake pad detection system based on a switch type principle, the brake pad detection system can measure the thickness of the brake pad in real time, is convenient for a driver to know the abrasion degree of the brake pad all the time, and can remind the driver to prepare for long-distance departure before the brake pad reaches the limit use thickness; the brake pad real-time thickness display device can display the real-time thickness of the brake pad, so that a driver can master the most complete abrasion information of each brake pad, the traffic accident rate is effectively reduced, and the driving safety of passengers is guaranteed.
(4) The device improves the defect that the existing brake pad thickness measuring device is easy to burn out due to frequent work, and utilizes the time delay switch to limit the singlechip to work frequently within a period of time, thereby effectively prolonging the service life and reducing the electric energy loss.
(5) According to the reluctance type automobile brake pad thickness detection structure, the thickness of the brake pad is indirectly measured by measuring the distance between the surface of the probe of the electromagnetic sensor and the side surface of the brake pad, the precision is high, the structure is simple, the implementation is convenient, and when the thickness of the brake pad is equal to or less than a set value, an alarm is given to remind a driver, so that the driver can conveniently control the abrasion degree of the brake pad at any time, and the control of the driver on the driving safety performance is improved to the maximum extent; the thickness of the brake pad can be automatically detected through the electromagnetic sensor power switch S1 and the power switch S2 of the signal processing module, the acquisition times are determined by drivers and passengers, the thickness of the brake pad is not detected once every time the driver steps on the brake, the brake caliper has the advantages of high efficiency and energy saving, and the service life of the detection system is prolonged.
Drawings
Fig. 1 is a schematic structural diagram of a thickness detection structure of a reluctance type automobile brake pad according to the present invention.
Fig. 2 is a schematic structural diagram of a thickness detection structure of a magnetic resistance type automobile brake pad after braking.
Fig. 3 is a schematic circuit diagram of the electromagnetic sensor according to the present invention.
FIG. 4 is a connection diagram of the switch and the display module inside the single chip microcomputer according to the present invention.
Fig. 5 is a flowchart of a method for detecting the thickness of a magnetoresistive automobile brake pad according to the present invention.
Number designations in the schematic drawings illustrate that:
1- -a piston; 2- -an electromagnetic sensor; 3- -brake block; 4- -brake caliper; 5- -brake disc; 6- -sealing ring; 7- -brake oil pipe; 8- -brake master cylinder; 9- -brake pedal; 10-signal processing module; 11- -display module.
Detailed Description
The invention is described in further detail below with reference to the following figures and detailed description:
referring to the attached figure 1, the thickness detection structure of the reluctance type automobile brake pad specifically comprises a piston 1; 2. an electromagnetic sensor; 3. a brake pad; 4. a brake caliper; 5. a brake disc; 6. a seal ring; 7. a brake oil pipe; 8. a master cylinder of the brake; 9. a brake pedal; 10. a signal processing module; 11. and a display module. According to the invention, a brake master cylinder 8 is connected with a piston 1 through a brake oil pipe 7, the piston 1 is fixedly connected to a brake caliper 4, the piston 1 is used for controlling the motion of a brake pad 3, when a driver steps on a brake, a brake tappet drives the piston in the brake master cylinder 8 to move, the brake oil pipe 7 is used for transferring pressure to the piston 1 through the brake oil, the caliper is used for pressing the brake pad 3 and a brake disc 5 to generate huge braking friction force, so that the brake control on the brake disc 5 is realized, the braking function of an automobile is realized, and after the driver releases the brake pedal, the brake pad 3 is returned due to the elasticity of a sealing ring 6. In the embodiment, two electromagnetic sensors 2 are arranged on the brake calipers 4 of the front left wheel, the front right wheel, the rear left wheel and the rear right wheel of the automobile, the total number of the electromagnetic sensors 2 is eight, the electromagnetic sensors 2 can statically and dynamically measure the distance between the brake disc 5 and the surface of the probe in a non-contact manner, high linearity and high resolution, the brake disc 5 is a metal magnetic substrate and high in measurement precision, the electromagnetic sensors 2 are linear metering tools, and in addition, an eddy current sensor can also be used as the sensor provided by the invention and used for detecting the thickness signal of the brake pad 3 in real time. The electromagnetic sensor 2 is arranged on the brake caliper 4 through a sensor support, a signal sending end of the electromagnetic sensor 2 is opposite to a brake disc 5, namely the signal sending end of the electromagnetic sensor 2 faces the brake disc 5, the surface of a probe of the electromagnetic sensor 2 and the outer side surface of a brake pad 3 are on the same vertical plane, and the electromagnetic sensor 2 is used for detecting a thickness signal of the brake pad 3 in real time, so that when the brake pad 3 is in contact with the brake disc 5, the distance between the surface of the probe of the electromagnetic sensor 2 and the side surface of the brake disc 5 is the real-time thickness of the brake pad 3; the thickness signal detected by the electromagnetic sensor 2 is accessed into the signal processing module 10 for data processing, thickness calculation and thickness compensation are carried out in the single chip microcomputer, and finally, the thickness value is displayed on the LCD screen of the display module 11 and alarm judgment is carried out according to the preset alarm standard. The electromagnetic sensor in the invention uses SJPB2316+3412PB produced by Youjin Qijia electroacoustic technology limited, the signal processing module 10 adopts an MSP430 singlechip of TI company, the display module 11 is an LCD liquid crystal screen, and the LCD liquid crystal screen is connected with the singlechip.
Fig. 1 is a schematic structural diagram showing a structure for detecting the thickness of a magnetic resistance type automobile brake pad before braking (when a brake pedal is not stepped on), and fig. 2 is a schematic structural diagram of an on-line detection system for the thickness of a magnetic resistance type automobile brake pad after braking. When a brake pedal is stepped on in the running process of an automobile, the master brake pump 8 generates thrust to move the piston 1 towards the direction close to the brake disc 5 under the action of hydraulic pressure, and drives the brake pad 3 to move towards the direction close to the brake disc 5, so that the brake control of the brake disc 5 is realized; generating a current signal under the action of the electromagnetic sensor, and sending the current signal to the signal processing module 10; the single chip microcomputer calculates the thickness information of the brake pad 3 during braking according to the current signal, compares the real-time thickness information of the brake pad 3 with the initial thickness of the brake pad 3 stored in advance, and transmits the information to the display and alarm device for recording or sound and light alarm.
Referring to fig. 3, each electromagnetic sensor 2 and the loop resistor R of the present invention1The power switch S1 is connected in series in sequence and then connected to two sides of a sensor power supply, the voltage of the sensor power supply is 36V, and the sensor power supply is connected to two sides of a sampling resistor R1Convert the current signal collected by the electromagnetic sensor 2 into a voltage signal and sample the resistor R1The input end of the signal processing module 10 is connected, and the signal processing module 10 is used for calculating the thickness of the brake pad 3.
With reference to fig. 4, fig. 4 is a connection diagram of the internal switch and the display module of the single chip microcomputer of the invention, eight electromagnetic sensors 2 of the invention are respectively connected with sampling resistors RL 0-RL 7, and the sampling resistors RL 0-RL 7 are connected to the single chip microcomputer; the power end of singlechip is provided with switch S2, when the pin IOC1 of singlechip detects the high level, the system is handled the data that IOA0~ IOA7 gathered, the LCD is connected with the singlechip for show brake block 3' S thickness information, and the output termination of singlechip has audible and visual alarm device, whether buzzing is judged according to the alarm standard that sets for in advance to the alarm that links to each other with P1.0 foot, and be connected with buzzer initiative and close switch S3.
Real-time thickness h signals of eight brake pads 3 of the four wheels of the automobile, namely the left front wheel, the right front wheel, the left rear wheel and the right rear wheel, which are processed in the singlechip are displayed through a display module 11; and the signal processing module 10 compares the real-time thickness h of the eight brake pads 3 with a set value h0In contrast, when the real-time thickness h of one of the eight brake pads 3 is equal to or less than the set value h0When the brake is used, the IOC4 outputs high level, the singlechip controls the sound and light alarm device to give out alarm sound and warning light, the thickness of the new brake pad 3 adopted in the invention is 14 mm, the replacement limit thickness is 7 mm, and the set value h is set0Set to 8 mm, the set value h designed in the invention0Can be about 0.5-1 mm larger than the limit thickness value so as to give an alarm for the thickness information of the brake pad 3 in advanceInforming the occupant of the effect. In the practical application process, the thickness of the brake pad 3 does not need to be detected every time the brake pedal is pressed, in order to protect the system and save electric energy, the system sets a delay closing switch S2 connected with the brake pedal, and the power supply is turned off when the thickness of the brake pad 3 does not need to be detected.
According to the invention, the thickness of the brake pad 3 can be detected in real time in the starting or braking process of the automobile by detecting the thickness of the brake pad 3, the abrasion degree of the brake pad 3 is displayed in real time by an instrument system, and an acousto-optic alarm is given when the brake pad 3 needs to be replaced, so that the safety control capability of a driver and passengers is improved.
Claims (5)
1. The utility model provides a magnetic resistance formula car brake block thickness detects structure, includes brake disc, brake block, brake caliper, piston, brake oil pipe, brake oil pump, sealing washer, its characterized in that: the electromagnetic sensor is arranged on two sides of four brake pads of an automobile, the brake pads are in contact friction with a brake disc to form a closed circuit, the thickness of the brake pads is reduced when the brake pads are worn to reduce the magnetic resistance, the change of the thickness of the brake pads is the change of the magnetic resistance, the electromagnetic sensor directly outputs induced potential, the electromagnetic sensor converts the measured value into the change of the mutual inductance coefficient M of a coil by using the electromagnetic induction principle, then the change of the mutual inductance coefficient M is converted into the output of current by a measuring circuit, the thickness change of the brake pads is converted into the magnetic change by the sensor, then the thickness calculation and the thickness compensation are carried out in the singlechip, finally, the thickness value is displayed on a liquid crystal screen of a display and alarm module, and the alarm judgment is carried out according to the preset alarm standard.
2. The reluctance type automobile brake pad thickness detection structure of claim 1, characterized in that: the electromagnetic sensors are horizontally and symmetrically arranged on two sides of the brake pad, and probes of the electromagnetic sensors are in close contact with the brake pad.
3. The reluctance type automobile brake pad thickness detection structure of claim 1, characterized in that: the circuit resistance is connected in the electromagnetic sensor circuit, when the thickness of the brake pad is detected, the electromagnetic sensor detects the electromagnetic performance and outputs an electromagnetic signal as a current signal, the current signal is converted into a voltage signal through the circuit resistance R1, and the voltage signal is received by the receiver.
4. The reluctance type automobile brake pad thickness detection structure of claim 1, characterized in that: the switch S1 and the delay closing switch S2 in the signal processing module are closed at the same time, the single chip microcomputer starts to process the brake pad thickness signals collected by the sensor, and the single chip microcomputer receives the voltage signals, calculates and processes the voltage signals and sends the voltage signals to the display terminal.
5. The reluctance type automobile brake pad thickness detection structure of claim 1, characterized in that: the data processing and display module utilizes the existing high-precision electromagnetic transceiving module and a matched singlechip structure on the market, can fully utilize a magnetic thickness measuring method to realize the thickness measurement of the brake pad, uploads the measured data to the singlechip, displays the numerical value through a screen, and also needs to measure the thickness h and the rated limit thickness position h0By comparison, when measuring the thickness h>h0When +1mm, the alarm is normal; when measuring the thickness h0<h≤h0When the thickness of the brake pad is detected for the first time when the vehicle is started, the alarm buzzes to give an alarm when the thickness of the brake pad is detected for the first time when the vehicle is started to be 1 mm; when measuring the thickness h<h0And in time, the alarm gives an alarm continuously to urge the driver to replace the brake pad.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110024662.2A CN112477839A (en) | 2021-01-08 | 2021-01-08 | Reluctance type automobile brake pad thickness detection structure |
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| CN202110024662.2A CN112477839A (en) | 2021-01-08 | 2021-01-08 | Reluctance type automobile brake pad thickness detection structure |
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| CN202110024662.2A Pending CN112477839A (en) | 2021-01-08 | 2021-01-08 | Reluctance type automobile brake pad thickness detection structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114857190A (en) * | 2022-05-27 | 2022-08-05 | 武汉科技大学 | Brake pad wear detection system |
| CN115028095A (en) * | 2022-08-11 | 2022-09-09 | 杭州未名信科科技有限公司 | Intelligent robot for tower crane maintenance and intelligent tower crane |
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Application publication date: 20210312 |