CN100480533C - Brake friction plate abrasion degree monitoring system based on elastic wave and wireless network - Google Patents
Brake friction plate abrasion degree monitoring system based on elastic wave and wireless network Download PDFInfo
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- CN100480533C CN100480533C CNB2007100473946A CN200710047394A CN100480533C CN 100480533 C CN100480533 C CN 100480533C CN B2007100473946 A CNB2007100473946 A CN B2007100473946A CN 200710047394 A CN200710047394 A CN 200710047394A CN 100480533 C CN100480533 C CN 100480533C
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Abstract
A brake friction disc attrition degree detection system based on the elastic wave and the wireless network belongs to the test engineering technology field. The invention comprises a movable wireless network terminal, an elastic wave stimulating module, an elastic wave signal receiving and transmitting module, and a vehicle computing and decision module, the movable wireless network terminal transmits a detection instruction to the elastic wave stimulating module, the elastic wave stimulating module generates a stimulating wave, an elastic wave is generated in the friction disc and transmitted to the elastic wave signal receiving and transmitting module, the elastic wave signal receiving and transmitting module digitizes the elastic wave signal and transmits the elastic wave signal to the vehicle computing and decision module, and the vehicle computing and decision module acquires the arrival time and the practical transmitting speed of the elastic wave signal, to acquire the attrition degree of the friction disc with the comparison with the database in the vehicle computing and decision module and to transmit the attrition degree to the mobile wireless network terminal. The invention detects the attrition degree of the brake friction disc and transmits the attrition degree to the driver at proper time, to enhance the security of the vehicle running.
Description
Technical field
The present invention relates to a kind of system of testing engineering technical field, specifically is a kind of brake friction plate abrasion degree monitoring system based on elastic wave and wireless network.
Background technique
The method that automotive brake regularly detects maintenance has obtained using the most widely at present.When certain cycle of automobilism or after running to certain mileage number, just need carry out the detection maintenance of automotive performance and key components and parts, to ensure running safety.The main shortcoming of this method is exactly beyond periodic maintenance detection time, and the driver does not have consciousness to remove to detect the performance and the health degree of these parts usually.Brake bush is one of most critical parts of vehicle safety travel, if can not in time understand its degree of wear, may cause immeasurable loss.At present, about the detection of brake friction plate abrasion degree two kinds of methods are arranged, a kind of method adopts and the most regularly detects method for maintaining, and another kind is the limit detecting method that adopts based on circuit.
Elastic wave is a kind of ultrasound that can propagate in plate and shell structure.Its important intrinsic characteristic is its Dispersion, promptly when ripple is propagated in plate and shell structure, its energy can launch in time and space domain, simultaneously, under the incoming wave excitation of a certain frequency, flexible velocity of propagation changes (I.A.Viktorov along with the change of the thickness of plate and shell structure, " Rayleigh wave and Lamb wave ", New York, Plenum publishing house, 1967).At present, elasticity has been widely used in the damage check of plate and shell structures such as aircraft and bridge, but does not also mention in the brake friction plate abrasion degree context of detection; In addition, the intrinsic Dispersion of elasticity itself has limited its application to a certain extent.
Find through literature search prior art, Chinese patent application number: 200510020329.5, publication number: CN1670395, name is called " friction plate, brake pad and friction disc wear limiting alarm system ", disclose a kind of friction plate, cooperated with brake drum or brake disc when being used to brake.The system that this invention proposes comprises the friction plate body, also comprises conducting objects.Conducting objects to small part is fixedly arranged in the friction plate body, and an end sends signal by signaling line, and the outer surface of described conducting objects conduction is a conducting surface, and the friction plate body has a layer insulating at least between the outer surface of brake drum or brake disc and described conducting surface.When friction plate reached wear limit, friction plate transmitted a signal to signal processing apparatus, carried out the warning of wear limit after the signal processing means processes.The deficiency of this invention is: 1) at friction disc wear before critical level, the driver can't grasp the current degree of wear of friction plate in real time; 2) need the structure of brake bush be redesigned and make, improved the cost that invention is used.
Summary of the invention
The present invention is directed to above-mentioned the deficiencies in the prior art, a kind of brake friction plate abrasion degree monitoring system based on elastic wave and wireless network is provided, intrinsic Dispersion when making it utilize elastic wave in plate and shell structure, to propagate, by calculating the actual propagation speed of ripple in brake bush, thereby determine the thickness of disk brake friction wafer, information is transmitted by wireless network, transmits the monitoring instruction in real time and receives the monitoring report by voice.
The present invention is achieved through the following technical solutions, the present invention includes: mobile wireless NT Network Terminal, elastic wave stimulating module, the reception of elastic wave signal and transmission module, vehicle computing and decision-making module, wherein: the mobile wireless NT Network Terminal is responsible for sending the detection instruction to the elastic wave stimulating module; The elastic wave stimulating module produces field wave after receiving the phonetic order that comes from the mobile wireless NT Network Terminal, and field wave is transmitted into brake bush, produce elastic wave in brake bush, elastic wave is transferred in reception of elastic wave signal and the transmission module; The elastic wave signal receives and transmission module is received in the elastic wave signal that produces in the brake bush, and with elastic wave signal digitalized back storage, then the elastic wave signal is transferred to vehicle computing and decision-making module; Vehicle computing and decision-making module receive the elastic wave signal and the elastic wave signal of transmission module transmission carries out filtering and asks envelope, extract the elastic wave feature of the time of advent, the actual propagation speed of calculating elastic ripple, and compare with vehicle computing and decision-making module internal database, obtain the degree of wear of brake bush, and degree of wear report is transferred to the hand-held mobile terminal.
Described elastic wave stimulating module, comprise phonetic order receiver, D/A, signal amplifier and piezoelectric chip actuator, the phonetic order receiver receives the phonetic order that comes from removable infinite network terminal, and the phonetic order that receives is transferred in the D/A; The digital actuation ripple signal that storage in advance has ultrasonic frequency in the D/A, after receiving the phonetic order that comes from the phonetic order receiver when D/A, with being stored in its inner digital actuation ripple signal conversion is Simulation of elastic waves field wave signal, and the Simulation of elastic waves excitation pulse is transferred to signal amplifier; Signal amplifier is responsible for the Simulation of elastic waves field wave signal of D/A transmission is amplified, and is transferred to the piezoelectric chip actuator; The piezoelectric chip actuator links to each other with non-working surface one end of brake bush, and the piezoelectric chip actuator is responsible for the field wave signal after being exaggerated is injected into brake bush.
Described digital actuation ripple signal, its frequency is 20kHz～500kHz.
Described elastic wave signal receives and transmission module, comprise piezoelectric chip receiver, single channel data acquisition unit and data buffer, the piezoelectric chip receiver is installed in the end of brake bush non-working surface away from the piezoelectric chip actuator, be responsible for receiving elastic wave, and elastic wave is passed to the single channel data acquisition unit by the brake bush transmission; The single channel data acquisition unit is responsible for the elastic wave digitizing with the transmission of piezoelectric chip receiver, and digitized elastic wave is transferred to data buffer; Data buffer is responsible for storing the elastic wave digital signal of single channel data acquisition unit transmission, and utilizes radio network technique to send the elastic wave signal to vehicle computing and decision-making module.
Described vehicle computing and decision-making module, comprise digital signal processing module and friction plate abrasion degree decision-making module, digital signal processing module receives the elastic wave signal that comes from data buffer, utilization is stored in the filtering and the Xi Er baud envelope algorithm of digital signal processing module, the elastic wave signal is carried out filtering and asks envelope to handle, obtain the elastic wave signal by envelope signal and incide brake bush to propagating into the required time of piezoelectric chip receiver from field wave, the time that crow flight distance between piezoelectric chip actuator and the piezoelectric chip receiver is propagated in brake bush divided by elastic wave, thereby calculate the actual velocity that elastic wave is propagated in friction plate, obtain the frequency of elastic wave signal simultaneously, and give the friction plate abrasion degree decision-making module the actual velocity of elastic wave and the frequency transmission of elastic wave signal; The friction plate abrasion degree decision-making module with the theoretical dispersion curve data of the propagation in the frequency of the actual velocity of elastic wave propagation and elastic wave signal and the database that is stored in the friction plate abrasion degree decision-making module relatively, draw the current thickness of brake bush, thereby also just obtained the degree of wear of brake bush, the generation degree of wear is reported, and is utilized radio network technique to send the mobile wireless NT Network Terminal to degree of wear report.
Compared with prior art, the present invention has following beneficial effect: (1) the present invention adopts SMD piezoelectric chip sensor respectively as the piezoelectric chip actuator and the piezoelectric chip receiver of elastic wave, therefore, the non-working surface that only piezoelectric chip actuator and piezoelectric chip receiver need be sticked on brake bush can be realized the installation of hardware, need not make structural change to existing friction plate; (2) the present invention adopts the radio network technique (for example basket tooth technology) that is about to extensive use on automobile, driver or authorized user can be by transmitting supervisory requests when wanting of what is the need in office of the mobile wireless NT Network Terminal of band radio function, thereby reach the purpose of real-time brake monitoring device friction plate abrasion degree, increase the Security of travelling; (3) thickness limit that the present invention can detected brake bush is 1.2mm, less than the thickness limit 1.5mm of common automobile brake friction plate, therefore can effectively be applied to brake system of car.
Description of drawings
Fig. 1 is a system architecture schematic representation of the present invention;
Fig. 2 is an elastic wave stimulating module structural representation of the present invention;
Fig. 3 is the linkage structure schematic representation of brake bush of the present invention and piezoelectric chip actuator, piezoelectric chip receiver;
Fig. 4 is the structural representation of elastic wave signal reception of the present invention and transmission module.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are done detailed explanation: present embodiment has provided detailed mode of execution and process being to implement under the prerequisite with the technical solution of the present invention, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, present embodiment comprises: mobile wireless Network Termination #1, elastic wave stimulating module 2, elastic wave signal receive and transmission module 4, vehicle computing and decision-making module 5, and wherein: the mobile wireless Network Termination #1 is responsible for sending the detection instruction to elastic wave stimulating module 2; Elastic wave stimulating module 2 produces field wave after receiving the phonetic order that comes from the mobile wireless Network Termination #1, and field wave is transmitted into brake bush 3, in brake bush 3, produce elastic wave and elastic wave is transferred to that the elastic wave signal receives and transmission module 4 in; The elastic wave signal receives and transmission module 4 receives the elastic wave signal that produces in brake bush 3, and with elastic wave signal digitalized back storage, then the elastic wave signal is utilized radio network technique to be transferred to vehicle computing and decision-making module 5; 5 pairs of elastic wave signals of vehicle computing and decision-making module receive and the elastic wave signal of transmission module 4 transmission carries out filtering and asks envelope, extract the elastic wave feature of the time of advent, the actual propagation speed of calculating elastic ripple, and compare with vehicle computing and decision-making module 5 internal databases, obtain the degree of wear of brake bush 3, and give the mobile wireless Network Termination #1 by wireless network transmissions degree of wear report.
Described mobile wireless Network Termination #1 is mobile phone or palm PC.
As shown in Figure 2, described elastic wave stimulating module 2, comprise phonetic order receiver 22, D/A 23, signal amplifier 24 and piezoelectric chip actuator 25, phonetic order receiver 22 receives the phonetic order 21 that comes from the mobile wireless Network Termination #1, and the phonetic order that receives is transferred in the D/A 23; Store the field wave signal in the D/A 23 in advance, after receiving the phonetic order 21 that comes from phonetic order receiver 22 when D/A 23, the elastic wave digital stimulus signal that is stored in D/A 23 inside is converted to the Simulation of elastic waves excitation pulse, and the Simulation of elastic waves excitation pulse is transferred to signal amplifier 24; Signal amplifier 24 is responsible for the Simulation of elastic waves excitation pulse of D/A 23 transmission is amplified, and is transferred to piezoelectric chip actuator 25; Piezoelectric chip actuator 25 links to each other with non-working surface one end of brake bush 3, and the field wave signal after being responsible for being exaggerated is injected into brake bush 3.
As shown in Figure 4, described elastic wave signal receives and transmission module 4, comprise piezoelectric chip receiver 41, single channel data acquisition unit 42 and data buffer 43, piezoelectric chip receiver 41 is installed in the end of brake bush 3 non-working surfaces away from piezoelectric chip actuator 25, be responsible for receiving elastic wave, and elastic wave is passed to single channel data acquisition unit 42 by brake bush 3 transmission; The elastic wave digitizing that single channel data acquisition unit 42 is responsible for 41 transmission of piezoelectric chip receiver, and digitized elastic wave is transferred to data buffer 43, data buffer 43 is responsible for the elastic wave digital signal of storage single channel data acquisition unit 42 transmission, and sends the elastic wave signal to vehicle computing and decision-making module by wireless network.
Described vehicle computing and decision-making module 5, comprise digital signal processing module and friction plate abrasion degree decision-making module, digital signal processing module receives the elastic wave signal that comes from data buffer 43, utilization is stored in the filtering and the Xi Er baud envelope algorithm of digital signal processing module, the elastic wave signal is carried out filtering and asks envelope to handle, obtain the elastic wave signal by envelope signal and incide brake bush 3 to propagating into the required time of piezoelectric chip receiver 41 from field wave, the time that crow flight distance between piezoelectric chip actuator 25 and the piezoelectric chip receiver 41 is propagated in brake bush 3 divided by elastic wave, thereby calculate the actual velocity that elastic wave is propagated in brake bush 3, obtain the frequency of elastic wave signal simultaneously, and give the friction plate abrasion degree decision-making module the actual velocity of elastic wave and the frequency transmission of elastic wave signal; The friction plate abrasion degree decision-making module, with the theoretical dispersion curve data of the propagation in the frequency of the actual velocity of elastic wave propagation and elastic wave signal and the database that is stored in the friction plate abrasion degree decision-making module relatively, draw the current thickness of brake bush 3, thereby also just obtained the degree of wear of brake bush 3, the generation degree of wear is reported, and is utilized radio network technique to send the mobile wireless Network Termination #1 to degree of wear report.
During present embodiment work, the mobile wireless Network Termination #1 sends phonetic order 21 to elastic wave stimulating module 2, requirement obtains the degree of wear report of brake bush, after phonetic order receiver 22 in the elastic wave stimulating module 2 receives and comes from the phonetic order 21 of mobile wireless Network Termination #1, this instruction is transferred to D/A 23, embedded the digital quantity of the field wave signal of 300kHz in the D/A 23 in advance, when receive come from phonetic order receiver 22 and detect instruction after, it is simulated that D/A 23 will embed inner field wave signal digital amount in advance, convert the elastic wave field wave signal of 300kHz to, the field wave signal is imported into signal amplifier 24, after signal amplifier 24 amplifications, the field wave signal becomes the field wave that can be applied on the piezoelectric chip actuator 25, piezoelectric chip actuator 25 incides the field wave signal in the accompanying brake bush 3, as shown in Figure 3; Owing to be subjected to the incentive action of field wave, elastic wave is energized in brake bush 3, and in brake bush 3, propagate, when the elastic wave propagation in brake bush 3 during to piezoelectric chip receiver 41, the distortion that piezoelectric chip receiver 41 produces and brake bush 13 is synchronous, convert elastic wave to analogue signal, this signal is imported into single channel data acquisition unit 42, thereby these Simulation of elastic waves are transported in the data buffer 43, as shown in Figure 4 after signal digitalized; After the elastic wave signals collecting finishes, digitized elastic wave signal is by data buffer 43, arrive vehicle computing and decision-making module 5 by wireless network transmissions, vehicle computing and decision-making module 5 receive from the elastic wave digital signal of data buffer 43, after utilizing wavelet transformation that signal is carried out noise reduction and filter preprocessing, the signal of handling is through the Xi Er baud conversion, obtain the envelope of signal, and then the acquisition propagation time of ripple from the actuator to the receiver, utilize the distance between piezoelectric chip actuator 25 and the piezoelectric chip receiver 41 again, the actual propagation speed of calculating elastic ripple under friction plate the present situation; For the friction plate of a coming of new, the transmission speed of elastic wave is 5000m/s, and after use after a while, the transmission speed of elastic wave becomes 5700m/s; The elastic wave actual propagation speed that estimates is imported in the friction plate abrasion degree decision-making module, by be implanted to the friction plate abrasion degree decision-making module in the elastic wave dispersion curve compare, the thickness that obtains obtaining under the current state brake bush 3 is 80% of original thickness, and the degree of wear that is to say brake bush 3 is 20%.Finally, utilize wireless network that degree of wear result is returned to the mobile wireless Network Termination #1.
Intrinsic Dispersion when this example utilizes elastic wave to propagate in plate and shell structure, utilize radio network technique to feed back to the mobile wireless NT Network Terminal friction plate abrasion degree report in time, reach the purpose of real-time monitoring automobile component operating mode, improved running safety.And utilize universal at present mobile phone and palm PC etc. to have the mobile terminal of wireless network module, driver or mandate passenger can send the request of detection by these mobile wireless NT Network Terminal in needs, can directly obtain degree of wear report.Present embodiment can detected brake bush thickness limit be 1.2mm, less than the thickness limit 1.5mm of common automobile brake friction plate, therefore can effectively be applied to brake system of car.
Claims (5)
1, a kind of brake friction plate abrasion degree monitoring system based on elastic wave and wireless network, it is characterized in that, comprise: mobile wireless NT Network Terminal, elastic wave stimulating module, the reception of elastic wave signal and transmission module, vehicle computing and decision-making module, wherein:
The mobile wireless NT Network Terminal is responsible for sending phonetic order to the elastic wave stimulating module;
The elastic wave stimulating module produces the field wave signal after receiving the phonetic order that comes from the mobile wireless NT Network Terminal, and the field wave signal is transmitted into brake bush, in brake bush, produce the Simulation of elastic waves signal and the Simulation of elastic waves signal is transferred to that the elastic wave signal receives and transmission module in;
The elastic wave signal receives and transmission module is received in the Simulation of elastic waves signal that produces in the brake bush, and store after this Simulation of elastic waves signal digital turned to the elastic wave digital signal, give vehicle computing and decision-making module with the elastic wave digital data transmission then;
Vehicle computing and decision-making module receive the elastic wave signal and the elastic wave digital signal of transmission module transmission is carried out filtering and asked envelope, extract the Simulation of elastic waves propagation time of signal in brake bush, the actual propagation speed of calculating elastic mode analog signal in brake bush, and compare with vehicle computing and decision-making module internal database, obtain the degree of wear of brake bush, and degree of wear report is transferred to the hand-held mobile terminal.
2, the brake friction plate abrasion degree monitoring system based on elastic wave and wireless network according to claim 1, it is characterized in that, described elastic wave stimulating module comprises phonetic order receiver, D/A, signal amplifier and piezoelectric chip actuator
The phonetic order receiver receives the phonetic order that comes from removable infinite network terminal, and the phonetic order that receives is transferred in the D/A;
The digital actuation ripple signal that storage in advance has ultrasonic frequency in the D/A, after receiving the phonetic order that comes from the phonetic order receiver when D/A, with being stored in its inner digital actuation ripple signal conversion is Simulation of elastic waves field wave signal, and Simulation of elastic waves field wave signal is transferred to signal amplifier;
Signal amplifier is responsible for the Simulation of elastic waves field wave signal of D/A transmission is amplified, and is transferred to the piezoelectric chip actuator;
The piezoelectric chip actuator links to each other with non-working surface one end of brake bush, the piezoelectric chip actuator is responsible for the Simulation of elastic waves field wave signal after being exaggerated is injected into brake bush, thereby produces described Simulation of elastic waves signal in brake bush.
3, the brake friction plate abrasion degree monitoring system based on elastic wave and wireless network according to claim 2 is characterized in that, described digital actuation ripple signal, and its frequency is 20kHz～500kHz.
4, the brake friction plate abrasion degree monitoring system based on elastic wave and wireless network according to claim 2, it is characterized in that, described elastic wave signal receives and transmission module, comprise piezoelectric chip receiver, single channel data acquisition unit and data buffer, the piezoelectric chip receiver is installed in the end of brake bush non-working surface away from the piezoelectric chip actuator, be responsible for receiving Simulation of elastic waves signal, and the Simulation of elastic waves signal is passed to the single channel data acquisition unit by the brake bush transmission; The single channel data acquisition unit is responsible for the Simulation of elastic waves signal digital of piezoelectric chip receiver transmission is turned to described elastic wave digital signal, and the elastic wave digital data transmission is arrived data buffer; Data buffer is responsible for storing the elastic wave digital signal of single channel data acquisition unit transmission, and utilizes radio network technique to send the elastic wave digital signal to vehicle computing and decision-making module.
5, brake friction plate abrasion degree monitoring system based on elastic wave and wireless network according to claim 4, it is characterized in that, described vehicle computing and decision-making module comprise digital signal processing module and friction plate abrasion degree decision-making module, digital signal processing module receives the elastic wave digital signal that comes from data buffer, utilization is stored in the filtering and the Xi Er baud envelope algorithm of digital signal processing module, the elastic wave digital signal is carried out filtering and asked envelope to handle, obtain the propagation time of Simulation of elastic waves signal in brake bush by envelope signal, with the crow flight distance between piezoelectric chip actuator and the piezoelectric chip receiver divided by the propagation time of Simulation of elastic waves signal in brake bush, thereby calculate the actual velocity that the Simulation of elastic waves signal is propagated in brake bush, obtain the frequency of Simulation of elastic waves signal simultaneously, and give the friction plate abrasion degree decision-making module the actual velocity of Simulation of elastic waves signal and the frequency transmission of Simulation of elastic waves signal; The theoretical dispersion curve data of the propagation in the actual velocity that the friction plate abrasion degree decision-making module is propagated the Simulation of elastic waves signal and the frequency of Simulation of elastic waves signal and the database that is stored in the friction plate abrasion degree decision-making module relatively, draw the current thickness of brake bush, thereby also just obtained the degree of wear of brake bush, the generation degree of wear is reported, and is utilized radio network technique to send the hand-held mobile terminal to degree of wear report.
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| CNB2007100473946A CN100480533C (en) | 2007-10-25 | 2007-10-25 | Brake friction plate abrasion degree monitoring system based on elastic wave and wireless network |
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| CNB2007100473946A CN100480533C (en) | 2007-10-25 | 2007-10-25 | Brake friction plate abrasion degree monitoring system based on elastic wave and wireless network |
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| CN100480533C true CN100480533C (en) | 2009-04-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US11215252B2 (en) | 2019-03-29 | 2022-01-04 | Bendix Commercial Vehicle Systems Llc | Wheel end brake pad wear sensor |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ITTO20130307A1 (en) | 2013-04-17 | 2014-10-18 | Itt Italia Srl | METHOD TO REALIZE A BRAKE ELEMENT, IN PARTICULAR A BRAKE PAD, SENSORIZED, SENSORED BRAKE PAD, VEHICLE BRAKE SYSTEM AND ASSOCIATED METHOD |
| US10553041B2 (en) * | 2017-03-27 | 2020-02-04 | Ford Global Technologies, Llc | Method and apparatus for vehicle system wear prediction |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4020454A (en) * | 1976-02-17 | 1977-04-26 | Malonee Arley L | Brake monitoring system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4020454A (en) * | 1976-02-17 | 1977-04-26 | Malonee Arley L | Brake monitoring system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11215252B2 (en) | 2019-03-29 | 2022-01-04 | Bendix Commercial Vehicle Systems Llc | Wheel end brake pad wear sensor |
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