CN103818374B - A kind of automobile brake sheet thickness real-time detection method - Google Patents
A kind of automobile brake sheet thickness real-time detection method Download PDFInfo
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- CN103818374B CN103818374B CN201410085684.XA CN201410085684A CN103818374B CN 103818374 B CN103818374 B CN 103818374B CN 201410085684 A CN201410085684 A CN 201410085684A CN 103818374 B CN103818374 B CN 103818374B
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Abstract
The invention discloses a kind of method of inspection of automobile brake sheet thickness real-time detecting system, belong to automobile brake system field.The steps include: 1) obtain thickness signal: the source switch S2 opening probe power switch S 1 and signal processing module, eddy current sensor and signal processing module energising, step on brake pedal again, limit switch S3 closes, eddy current sensor detects, and obtains brake facing thickness signal when brake facing contacts with brake disc; 2) thickness signal data are processed: by sampling resistor RL, the current signal that step 1) obtains is converted to voltage signal, and this voltage signal incoming signal processing module is processed; 3) data display and audible and visible alarm: by step 2) in process eight brake facings of left front, right front, left back, the right back four-wheel of the automobile obtained real-time thickness h signal shown by display module.Structure of the present invention is simple, and survey precision is high, and the safety adding chaufeur controls ability.
Description
Patent application of the present invention is: the divisional application of 2012102508029, and the applying date of original application is: 2012-07-19, and invention and created name is: a kind of automobile brake sheet thickness real-time detecting system and method for inspection thereof.
Technical field
The present invention relates to the automatic Test and control field of automobile brake system, more particularly, relate to a kind of automobile brake sheet thickness real-time detection method, the precise thickness being applicable to automobile brake sheet detects in real time.
Background technology
Automobile enters daily life, and the safety of automobile also more and more becomes the factor that automobile vendor and customer more pay close attention to.According to statistics, the reason that traffic accident occurs has more than 70% to follow brake bad relevant, so the brake system of automobile is most important to traffic safety, if can realize the intact degree detecting brake system in time, then greatly can improve traffic safety, reduce the incidence of traffic accident.
Make a general survey of meter system and the safety detecting system of current riding vehicle, major part does not have brake facing wear detector and display instruction, or detects too extensive, and the real-time of detection is inadequate.Chaufeur to when needing to change brake facing, then needs to be timed to motor transport repair shop or the inspection of 4S shop.100,000 kilometers, some cars are just changed, some cars then 50,000 kilometers just need to change, 40,000 km even had just need to have changed.The degree of wear of brake facing is relevant with brake facing material, more relevant with driving habit, and when thus very difficult milimeter number needs to change if being weighed.Can not detection display grasp the accurate degree of wear of automobile brake sheet in time, very large inconvenience must be brought to driver and crew, and there is very large potential safety hazard.Therefore, setting up brake facing and automatically detect and show, is the important content improving vehicle safety.
By message retrieval, the existing method of inspection explanation about brake facing thickness.As: Chinese Patent Application No. 03110888.1, the applying date is on January 15th, 2003, invention and created name is: the instant checking system of braking automobile, this application case is by the displacement sensing system of each wheel, pressure capsule system, the collection signal of leakage of oil sensor-based system imports data processing system into, and contrast with the preset parameter of data processing system, again the processing signals after contrast is exported to display alarm system, wherein displacement (variation in thickness) sensor collection head is arranged on brake block friction material variation in thickness position, what in this application case, collection head adopted is contact collection, brake facing only have when may wear to thickness limited, collection head just can collect signal and deliver to data processing system process, and then send alerting signal, can not the brake facing thickness information that quantized accurately of Real-time Collection, the information grasped due to driver and crew otherwise be brake facing wearing and tearing lighter, not yet reach replacing degree, be exactly need to have changed at once, there is no other states, that is, when starting automobile possible last time, brake facing thickness not yet arrived alarming value, and this time just go out on the way, perhaps brake facing thickness detecting system just detects the alarming value needing at once to change, this cannot the alarm and reminding of foreseeability, the braking quality controlling brake facing is at any time needed to be very disadvantageous to driver and crew, and sensor collection head together can be worn along with the wearing and tearing of brake facing, the sensor collection head more renewed all is needed when the brake facing that can cause at every turn more renewing is set like this, and the installation of sensor is cumbersome, need the production technology changing brake facing simultaneously.
In addition, China Patent No. ZL200920067482.7, the applying date is on February 4th, 2009, utility model name is called: vehicle brake system automatic detector, this application case adopts PIC18F452 micro controller system, in conjunction with small-angle sensor, pressure sensor and viscosity sensor, gather the performance data of automobile brake disc, brake facing, vacuum booster pump and master cylinder, after data processing, result is shown to and is positioned on the LCD MODULE of vehicle console.Small-angle sensor is adopted to gather abrasion loss in this application case, but the program is angle change brake facing abrasion loss be converted between sensor, by the abrasion loss of small-angle sensor indirect inspection brake facing, and be easily subject to the impact of vehicle operating environment and installation environment, so its accuracy of detection is lower.
In order to improve the safety performance of automobile brake system, also have by being achieved to the improvement of brake facing.As China Patent No. ZL201120315336.9, invention and created name is: brake facing; China Patent No. ZL200920112161.4, invention and created name is: disc brake pad; China Patent No. ZL201120061838.3, invention and created name is: a kind of brake facing with alarm device mounting port; China Patent No. ZL201120061837.9, invention and created name is: the brake facing of band alarm; China Patent No. ZL201020603083.0, invention and created name is: novel brake pad; China Patent No. ZL91228931.7, invention and created name is: automobile brake ribbon wearing limit alarm.Above-mentioned brake facing all can only provide a switching value, brake facing is reminded to may wear to the limit, reality can not in real time detect the degree of wear of brake facing, more can not predict the wear pattern of chaufeur brake facing in advance, even if so have issued limiting alarm sometimes, but when some can not change brake facing immediately, chaufeur has to continue to travel, and still there is potential safety hazard.
Summary of the invention
1. invent the technical matters that will solve
The invention reside in and overcome the deficiency that in prior art, brake facing thickness cannot detect in real time, a kind of automobile brake sheet thickness real-time detection method is provided, adopt technical scheme of the present invention, automatically detecting in real time of brake facing thickness can be realized, and show brake facing thickness in real time by display module, provide audible and visible alarm to remind when brake facing changed by needs, detect accurately, conveniently, the safety considerably increasing driver and crew controls ability.
2. technical scheme
For achieving the above object, technical scheme provided by the invention is:
A kind of automobile brake sheet thickness real-time detecting system of the present invention, comprise brake disc, brake facing, brake callipers, piston, brake oil pipe, brake oil pump and brake pedal, brake pedal is for promoting the motion of brake oil pump, brake oil pump is connected with piston by brake oil pipe, piston is fixed on brake callipers, piston is for controlling the motion of brake facing, thus realize controlling the brake of brake disc, also comprise sensor stand, eddy current sensor, signal processing module and display module, wherein: automobile is left front, right front, left back, the brake callipers of right back four-wheel is provided with two eddy current sensors, this eddy current sensor is installed on brake callipers by sensor stand, the signal sending end of eddy current sensor is relative with brake disc position, and the lateral surface of the detecting head surface of eddy current sensor and brake facing is on same perpendicular, eddy current sensor is used for the thickness signal detecting brake facing in real time, each above-mentioned eddy current sensor and sampling resistor RL, probe power switch S 1 accesses probe power both sides after connecting successively, by sampling resistor RL, the current signal of eddy current sensor collection is converted to voltage signal, and sampling resistor RL is accessed the input end of signal processing module, signal processing module is for calculating the thickness of brake facing, the power end of signal processing module is provided with source switch S2, and brake pedal is as limit switch S3, this limit switch S3 signal access signal processing module, whether data processing is carried out for control signal processing module, display module is connected with signal processing module, for showing the thickness information of brake facing, and the mouth of signal processing module is connected to audible and visible alarm device.
Described signal processing module is micro controller system, and display module is LCD liquid crystal display, and above-mentioned LCD liquid crystal display is connected with described micro controller system.
A kind of automobile brake sheet thickness real-time detection method of the present invention, the steps include:
1) thickness signal is obtained:
Open the source switch S2 of probe power switch S 1 in automobile brake sheet thickness real-time detecting system and signal processing module, eddy current sensor and signal processing module energising, step on brake pedal again, limit switch S3 closes, eddy current sensor detects, obtain brake facing thickness signal when brake facing contacts with brake disc, export the standard current signal of 4 ~ 20mA;
2) thickness signal data are processed:
By sampling resistor RL by step 1) current signal that obtains is converted to voltage signal, and this voltage signal incoming signal processing module is processed, voltage signal is converted to distance value d by the calibration value according to eddy current sensor, this distance value d is that brake facing is when contacting with brake disc, the detecting head surface of eddy current sensor and the lateral distance of brake disc, be the real-time thickness h of brake facing;
3) data display and audible and visible alarm:
By step 2) in process eight brake facings of left front, right front, left back, the right back four-wheel of automobile obtained real-time thickness h signal shown by display module; And the real-time thickness h of above-mentioned eight brake facings and setting value h0 contrasts by signal processing module, when the real-time thickness h of one of them is equal to or less than setting value h0, signal processing module controls audible and visible alarm device, sounds the alarm and Warning light prompting.
3. beneficial effect
Adopt technical scheme provided by the invention, compared with existing known technology, there is following remarkable result:
(1) a kind of automobile brake sheet thickness real-time detection method of the present invention, the brake callipers of left front at automobile, right front, left back, right back four-wheel is provided with two eddy current sensors, utilize the magnetic property of steel brake disc cleverly, adopt eddy current sensor directly measure brake facing contact brake disc time eddy current sensor and brake disc between distance, namely brake facing effectively utilize thickness, accuracy of detection is high, can reach a μm magnitude;
(2) a kind of automobile brake sheet thickness real-time detection method of the present invention, its eddy current sensor can accurately detect the thickness quantitative information of brake facing in contactless ground, do not need customization or repacking brake facing, do not need more emat sensor when replacing brake facing, commonality is good; Compare the brake facing checking system of switching mode principle, real-time brake facing thickness can be measured, facilitate the chaufeur moment to understand the degree of wear of brake facing, can brake facing reach the limit of use thickness before just remind chaufeur be long-distance go out car ready;
(3) a kind of automobile brake sheet thickness real-time detection method of the present invention, can show brake facing real-time thickness, makes chaufeur grasp the most complete every a slice brake facing wear information, effectively reduces traffic accident incidence, ensure the traffic safety of personnel by bus;
(4) a kind of automobile brake sheet thickness real-time detection method of the present invention, by measuring the detecting head surface of eddy current sensor and the lateral distance of brake disc, realize the thickness of indirect inspection brake facing, precision is high, and structure is simple, and it is convenient to implement, and when being equal to or less than setting value for brake facing thickness, give the alarm prompting, facilitates chaufeur to control the degree of wear of brake facing at any time, improves the control of chaufeur to traffic safety performance to greatest extent; And when the present invention detects brake facing thickness by the source switch S2 of probe power switch S 1 and signal processing module from main separation, times of collection is determined by driver and crew, not touch on the brake all to detect a brake facing thickness at every turn, there is energy-efficient advantage, also extend the service life of checking system.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of automobile brake sheet thickness real-time detecting system of the present invention;
Fig. 2 is the circuit connection diagram of eddy current sensor in the present invention;
Fig. 3 is the circuit connection diagram of micro controller system in embodiment 1;
Fig. 4 is the schematic flow sheet of a kind of automobile brake sheet thickness real-time detection method of the present invention.
Label declaration in schematic diagram:
1-brake disc; 2-brake facing; 3-brake callipers; 4-piston; 5-sensor stand; 6-eddy current sensor; 7-brake oil pipe; 8-signal processing module; 9-display module; 10-brakes oil pump; 11-brake pedal.
Detailed description of the invention
For understanding content of the present invention further, the present invention is described in detail in conjunction with the accompanying drawings and embodiments.
Embodiment 1
Composition graphs 1, a kind of automobile brake sheet thickness real-time detecting system of the present embodiment, comprises brake disc 1, brake facing 2, brake callipers 3, piston 4, sensor stand 5, eddy current sensor 6, brake oil pipe 7, signal processing module 8, display module 9, brake oil pump 10 and brake pedal 11.In the present embodiment, brake pedal 11 moves for promoting brake oil pump 10, and brake oil pump 10 is connected with piston 4 by brake oil pipe 7, and piston 4 is fixed on brake callipers 3, and piston 4 for controlling the motion of brake facing 2, thus realizes controlling the brake of brake disc 1; In the present embodiment left front, right front, left back, the right back four-wheel of automobile brake callipers 3 on be provided with two eddy current sensors 6, eight eddy current sensors 6 altogether, the distance of brake disc 1 apart from detecting head surface is measured on the ground noncontact of eddy current sensor 6 energy Static and dynamic, high linearity, high resolution ground, brake disc 1 is metallic conductor, survey precision is high, eddy current sensor 6 is a kind of non-contacting linearization meter outfits, in addition, differential inductor sensor also can be used as sensor of the present invention and uses, for detecting the thickness signal of brake facing 2 in real time.These eddy current sensors 6 are installed on brake callipers 3 by sensor stand 5, the signal sending end of eddy current sensor 6 is relative with brake disc 1 position, namely the signal sending end of eddy current sensor 6 faces brake disc 1, and the lateral surface of the detecting head surface of eddy current sensor 6 and brake facing 2 is on same perpendicular, eddy current sensor 6 is for detecting the thickness signal of brake facing 2 in real time, make when brake facing 2 contacts with brake disc 1, the detecting head surface of eddy current sensor 6 and the lateral distance of brake disc 1 are the real-time thickness of brake facing 2; The thickness signal that the eddy current sensor 6 of the present embodiment detects accesses signal processing module 8, carry out data processing, and final brake facing thickness information is shown by display module 9, in the present embodiment, signal processing module 8 adopts Ling Yang SPMC75F2413A micro controller system, display module 9 is LCD liquid crystal display, and above-mentioned LCD liquid crystal display is connected with micro controller system.What deserves to be explained is, the signal processing module 8 in the present invention also can adopt other data processing module, as adopted TMS320F2812DSP etc.
Composition graphs 2, in the present embodiment, each eddy current sensor 6 and sampling resistor RL, probe power switch S 1 access probe power both sides after connecting successively, the voltage of this probe power is 24V, by sampling resistor RL, the current signal that eddy current sensor 6 gathers is converted to voltage signal, and sampling resistor RL being accessed the input end of signal processing module 8, signal processing module 8 is for calculating the thickness of brake facing 2.
Composition graphs 3, Fig. 3 is the single chip circuit connection diagram of the present embodiment, and eight eddy current sensors 6 of the present embodiment are connected with sampling resistor RL0 ~ RL7 respectively, and sampling resistor RL0 ~ RL7 accesses micro controller system; The power end of micro controller system is provided with source switch S2, and brake pedal 11 is as limit switch S3, this limit switch S3 signal access micro controller system, whether data processing is carried out for control single chip computer, when the IOC1 of micro controller system detects high level, system processes the data that IOA0 ~ IOA7 gathers, LCD liquid crystal display is connected with micro controller system, for showing the thickness information of brake facing 2, and the mouth of micro controller system is connected to audible and visible alarm device, and audible and visible alarm device is provided with switch S 4, chaufeur can be selected initiatively to close audible and visible alarm after knowing audible and visible alarm.
Composition graphs 4, a kind of automobile brake sheet thickness real-time detection method of the present invention, its concrete steps are:
1) thickness signal is obtained:
Open the source switch S2 of probe power switch S 1 in automobile brake sheet thickness real-time detecting system and micro controller system, eddy current sensor 6 and micro controller system energising, step on brake pedal 11 again, limit switch S3 closes, eddy current sensor 6 detects, obtain brake facing 2 thickness signal when brake facing 2 contacts with brake disc 1, export the standard current signal of 4 ~ 20mA;
2) thickness signal data are processed:
By sampling resistor RL by step 1) current signal that obtains is converted to voltage signal, and this voltage signal input micro controller system is processed, voltage signal is converted to distance value d by the calibration value according to eddy current sensor 6, in the present embodiment eddy current sensor 6 adopt be Guangzhou Jing Xin instrument appliance Co., Ltd JX20XL series eddy current displacement sensor, sensor accuracy 0.05mm, its calibration value is 1.33mA/mm, and the calibration value of this eddy current sensor 6 is provided by concrete sensor producer; This distance value d is that brake facing 2 is when contacting with brake disc 1, the detecting head surface of eddy current sensor 6 and the lateral distance of brake disc 1, be the real-time thickness h of brake facing 2, by the data processing of this step, obtain the one-tenth-value thickness 1/10 of eight brake facings 2 of left front, right front, left back, the right back four-wheel of automobile;
3) data display and audible and visible alarm:
By step 2) in process eight brake facings 2 of left front, right front, left back, the right back four-wheel of automobile obtained real-time thickness h signal shown by display module 9, and the real-time thickness h of above-mentioned eight brake facings 2 and setting value h0 contrasts by signal processing module 8, when the real-time thickness h of one of eight brake facings 2 is equal to or less than setting value h0, then IOC4 exports high level, Single-chip Controlling audible and visible alarm device, sound the alarm and Warning light prompting, the brake facing 2 new film thickness adopted in the present embodiment is 14 millimeters, the thickness limit changed is 7 millimeters, setting value h0 is set to 8 millimeters, setting value h0 designed in the present invention can 0.5 ~ 1 millimeter larger than thickness limit value, to play the effect of brake facing 2 thickness information advance alert being informed driver and crew.In actual application; the thickness of brake facing 2 do not need all to detect when stepping on brake pedal 11 at every turn, in order to protection system with save electric energy, the default source switch S2 of probe power switch S 1 and micro controller system hereby; when not needing the thickness detecting brake facing 2, turn off power supply.
The present invention is by the detection to brake facing 2 thickness, automobile starting can be realized or brake process detects automatically to brake facing 2 thickness, and show brake facing 2 degree of wear in real time at meter system, and need to send audible and visible alarm when changing brake facing 2, the safety increasing driver and crew controls ability.
Claims (1)
1. an automobile brake sheet thickness real-time detection method, the steps include:
1) thickness signal is obtained:
Open the source switch S2 of probe power switch S 1 in automobile brake sheet thickness real-time detecting system and signal processing module (8), eddy current sensor (6) and signal processing module (8) energising, step on brake pedal (11) again, limit switch S3 closes, eddy current sensor (6) detects, obtain brake facing (2) thickness signal when brake facing (2) contacts with brake disc (1), export the standard current signal of 4 ~ 20mA, wherein, automobile brake sheet thickness real-time detecting system comprises brake disc (1), brake facing (2), brake callipers (3), piston (4), brake oil pipe (7), brake oil pump (10) and brake pedal (11), brake pedal (11) is for promoting brake oil pump (10) motion, brake oil pump (10) is connected with piston (4) by brake oil pipe (7), piston (4) is fixed on brake callipers (3), piston (4) is for controlling the motion of brake facing (2), thus realize controlling the brake of brake disc (1), also comprise sensor stand (5), eddy current sensor (6), signal processing module (8) and display module (9), wherein: automobile is left front, right front, left back, the brake callipers (3) of right back four-wheel is provided with two eddy current sensors (6), this eddy current sensor (6) is installed on brake callipers (3) by sensor stand (5), the signal sending end of eddy current sensor (6) is relative with brake disc (1) position, and the lateral surface of the detecting head surface of eddy current sensor (6) and brake facing (2) is on same perpendicular, eddy current sensor (6) is for detecting the thickness signal of brake facing (2) in real time, each above-mentioned eddy current sensor (6) and sampling resistor RL, probe power switch S 1 accesses probe power both sides after connecting successively, by sampling resistor RL, the current signal that eddy current sensor (6) gathers is converted to voltage signal, and sampling resistor RL is accessed the input end of signal processing module (8), signal processing module (8) is for calculating the thickness of brake facing (2), the power end of signal processing module (8) is provided with source switch S2, and brake pedal (11) is as limit switch S3, this limit switch S3 signal access signal processing module (8), whether data processing is carried out for control signal processing module (8), display module (9) is connected with signal processing module (8), for showing the thickness information of brake facing (2), and the mouth of signal processing module (8) is connected to audible and visible alarm device,
2) thickness signal data are processed:
By sampling resistor RL by step 1) current signal that obtains is converted to voltage signal, and this voltage signal incoming signal processing module (8) is processed, voltage signal is converted to distance value d by the calibration value according to eddy current sensor (6), this distance value d is that brake facing (2) is when contacting with brake disc (1), the detecting head surface of eddy current sensor (6) and the lateral distance of brake disc (1), be the real-time thickness h of brake facing (2);
3) data display and audible and visible alarm:
By step 2) in process eight brake facings (2) of left front, right front, left back, the right back four-wheel of automobile obtained real-time thickness h signal shown by display module (9); And the real-time thickness h of above-mentioned eight brake facings (2) and setting value h0 contrasts by signal processing module (8), when the real-time thickness h of one of them is equal to or less than setting value h0, signal processing module (8) controls audible and visible alarm device, sounds the alarm and Warning light prompting.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210250802.9A CN102774373B (en) | 2012-07-19 | 2012-07-19 | System and method for detecting thickness of automobile brake pad in real time |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210250802.9A Division CN102774373B (en) | 2012-07-19 | 2012-07-19 | System and method for detecting thickness of automobile brake pad in real time |
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| CN103818374A CN103818374A (en) | 2014-05-28 |
| CN103818374B true CN103818374B (en) | 2016-01-20 |
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| CN201210250802.9A Active CN102774373B (en) | 2012-07-19 | 2012-07-19 | System and method for detecting thickness of automobile brake pad in real time |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN103818374A (en) | 2014-05-28 |
| CN102774373B (en) | 2014-07-09 |
| CN102774373A (en) | 2012-11-14 |
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