CN208537174U - A kind of automobile engine vibration frequency detection device - Google Patents
A kind of automobile engine vibration frequency detection device Download PDFInfo
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- CN208537174U CN208537174U CN201821284389.7U CN201821284389U CN208537174U CN 208537174 U CN208537174 U CN 208537174U CN 201821284389 U CN201821284389 U CN 201821284389U CN 208537174 U CN208537174 U CN 208537174U
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Abstract
A kind of automobile engine vibration frequency detection device, including hand-held data processor and piezoelectric transducer are connected between piezoelectric transducer and hand-held data processor by data connecting line；Hand-held data processor includes encapsulating shell, and PCB circuit board and battery are fixed with inside encapsulating shell, A/D converter, micro-chip processor and communication module are fixed in PCB circuit board；Piezoelectric transducer includes shell and probe, bottom pop one's head in equipped with working chamber, from down toward having piezoelectric ceramic piece, clump weight and spring leaf in working chamber, piezoelectric ceramic piece, clump weight and spring leaf are fixed on probe by perforative bolt, charge amplifier is fixed in the accommodating cavity of interior of shell, piezoelectric ceramic piece is connect by lead-out wire with charge amplifier.The device is easy to carry, easy to operate, and in one, double charge amplifier built in piezoelectric transducer can eliminate common mode interference, be effectively prevented high temperature, the electromagnetic interference of engine for collective data acquisition and data analysis and function.
Description
Technical field
The utility model relates to automobile engine detection technique fields, and in particular to a kind of automobile engine vibration frequency inspection
Survey device.
Background technique
With social development, the comfort that car stand multiplies is increasingly becoming problem concerned by people, and the vibration of engine is then
One importance.In addition when engine generates judder, body itself not only is vibrated, can also make engine interior
Components and various auxiliary equipments, vehicle frame etc. generate vibration, to influence the working performance and service life and surrounding of vehicle
Environment.Car engine machine vibration is mainly from three aspects: first is that the reciprocal inertia force of the reciprocating members such as piston rod；Two
It is the centrifugal intertia force as caused by unbalance mass, on the rotary parts such as crankshaft-flywheel；Third is that gaseous-pressure.
The product of the integrated vibrating sensor of country's hand-held is less at present, and the B&K company production of foreign well-known concentrates on leading to
With in the research of acceleration transducer, engine luggine detection uses piezoelectric transducer, the acquisition of mating charge amplifier scheme and
Amplified signal has the disadvantages that since universal test system is not special test equipment for engine luggine detection
1, system complex, engine electromagnet interference is big, data be difficult to accomplish it is reliable and stable, and before the experiment of system linear frequency
It first to demarcate, it is troublesome in poeration；
2, the impedance of sensor is high, and one termination enclosure of component of piezoelectric conversion, piezoelectric ceramic piece is not isolated, and single-ended signal passes
It is defeated, there are problems that total Earth noise and common mode interference cannot be inhibited.
Utility model content
The utility model to solve the above-mentioned problems, devises a kind of automobile engine vibration frequency detection device, the dress
Set it is easy to carry, easy to operate, collective data acquisition and data analyze and function in one, double charge built in piezoelectric transducer
Amplifier amplifies the charge signal of differential output, in the method that front end uses the amplification of differential double charge, eliminates common mode interference,
It is effectively prevented high temperature, the electromagnetic interference of engine.
In order to achieve the above technical purposes, reach above-mentioned technical effect, the utility model is real by the following technical programs
Existing:
A kind of automobile engine vibration frequency detection device, which is characterized in that including hand-held data processor and piezoelectricity
Formula sensor is connected between piezoelectric transducer and hand-held data processor by data connecting line；
The hand-held data processor includes encapsulating shell, is equipped with data line socket, encapsulating shell bottom at the top of encapsulating shell
Equipped with communication serial ports, PCB circuit board and battery are fixed with inside encapsulating shell, battery connect with PCB circuit board and turns for A/D
Parallel operation, micro-chip processor and communication module provide power supply, and encapsulating shell front is equipped with display screen, is equipped with key, PCB below display screen
It is fixed with A/D converter, micro-chip processor and communication module on circuit board, A/D converter and communication module and micro-chip processor
Connection, piezoelectric transducer are connect with A/D converter；
The piezoelectric transducer includes shell and probe, and probe bottom end is embedded in cover top portion, and probe bottom is equipped with work
Make chamber, from down toward having piezoelectric ceramic piece, clump weight and spring leaf, piezoelectric ceramic piece, clump weight and spring leaf in working chamber
It is fixed on probe by perforative bolt, charge amplifier is fixed in the accommodating cavity of interior of shell, piezoelectric ceramic piece is by drawing
Outlet is connect with charge amplifier；
The charge amplifier includes piezo-electric crystal, the first operational amplifier U1ACA082, second operational amplifier
Two pins of U1BCA082, feedback capacity Cf and feedback resistance Rf, piezo-electric crystal connect the first operational amplifier respectively
The input pin 2 and input pin 3 of U1ACA082 accesses capacitor CG between piezo-electric crystal and the first operational amplifier U1ACA082, the
The output pin 1 of one operational amplifier U1ACA082 connects on the input pin 6 of second operational amplifier U1BCA082 and the route of connection
Equipped with resistance R2, the input pin 5 of second operational amplifier U1BCA082 is grounded, and the first operational amplifier U1ACA082 is parallel with instead
Feed holds Cf, in parallel with the first operational amplifier U1ACA082 after feedback capacity Cf is in parallel with two concatenated feedback resistance Rf,
Resistance R3, the first operational amplifier U1ACA082 and second operational amplifier are parallel on second operational amplifier U1BCA082
U1BCA082 is upper in parallel there are two concatenated feedback resistance Rf and feedback capacity Cf, in parallel on the first operational amplifier input pin 2
Two feedback resistances and input pin 3 on the current limliting of capacitor C1 and resistance R1 composition is parallel between two feedback resistances in parallel
Circuit.
Further, it inwardly concaves to form grip part in the middle part of the encapsulating shell, grip part surface is equipped with anti-skid bulge.
Further, the micro-chip processor selects ARM S3C2410 to handle chip.
The beneficial effects of the utility model are: the device is easy to carry, easy to operate, collective data acquisition and data analysis
With function in one, double charge amplifier built in piezoelectric transducer amplifies the charge signal of differential output, uses in front end
The method of differential double charge amplification, eliminates common mode interference, is effectively prevented high temperature, the electromagnetic interference of engine.
Detailed description of the invention
In order to illustrate more clearly of the technical solution of the utility model embodiment, make required for being described below to embodiment
Attached drawing is briefly described, it should be apparent that, the drawings in the following description are merely some embodiments of the present invention,
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings
Other attached drawings.
Fig. 1 is a kind of overall structure diagram of automobile engine vibration frequency detection device；
Fig. 2 is the structural block diagram of the hand-held data processor；
Fig. 3 is the piezoelectric transducer schematic cross-sectional view；
Fig. 4 is the electrical block diagram of the charge amplifier.
In attached drawing, parts list represented by the reference numerals are as follows:
1- hand-held data processor, 2- piezoelectric transducer, 11- display screen, 12-PCB circuit board, 13- battery,
14- key, 15- screw, 16- anti-skid bulge, 17-USB printing interface, 121-A/D converter, 122- micro-chip processor, 123-
Communication module, 141- power switch button, 142- saving button, 143- print button, 144- inquiry button, 21- data connection
Line, 201- probe, 202- piezoelectric ceramic piece, 203- clump weight, 204- spring leaf, 205- bolt, 206- charge amplifier.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without creative efforts
All other embodiment obtained, fall within the protection scope of the utility model.
Refering to fig. 1 shown in -3, a kind of automobile engine vibration frequency detection device, including 1 He of hand-held data processor
Piezoelectric transducer 2 is connected between piezoelectric transducer 2 and hand-held data processor 1 by data connecting line 21；
The hand-held data processor 1 includes encapsulating shell, inwardly concaves to form grip part in the middle part of encapsulating shell, grip part
Surface is equipped with anti-skid bulge 16, and data line socket is equipped at the top of encapsulating shell, and encapsulating shell bottom, which is equipped with, communicates serial ports, inside encapsulating shell
It is fixed with PCB circuit board 12 and battery 13, battery 13 is connect with PCB circuit board 12, and encapsulating shell front is equipped with display screen 11,
It is equipped with key 14 below display screen 11, A/D converter 121, micro-chip processor 122 and communication mould are fixed in PCB circuit board 12
Block 123, A/D converter 121 and communication module 123 are connect with micro-chip processor 122, piezoelectric transducer 2 and A/D converter 121
Connection.
Piezoelectric transducer 2 includes shell and probe 201, and 201 bottom ends of probe are embedded in cover top portion, and 201 bottoms of probe are set
There is a working chamber, from down toward having piezoelectric ceramic piece 202, clump weight 203 and spring leaf 204, piezoelectric ceramic piece in working chamber
202, clump weight 203 and spring leaf 204 are fixed on probe 201 by perforative bolt 205, fixed in the accommodating cavity of interior of shell
There is charge amplifier 206, piezoelectric ceramic piece 202 is connect by lead-out wire with charge amplifier 206.
As shown in fig.4, charge amplifier 206 includes piezo-electric crystal, the first operational amplifier U1ACA082, the second operation
Two pins of amplifier U1BCA082, feedback capacity Cf and feedback resistance Rf, piezo-electric crystal connect the first operational amplifier respectively
The input pin 2 and input pin 3 of U1ACA082 accesses capacitor CG between piezo-electric crystal and the first operational amplifier U1ACA082, the
The output pin 1 of one operational amplifier U1ACA082 connects on the input pin 6 of second operational amplifier U1BCA082 and the route of connection
Equipped with resistance R2, the input pin 5 of second operational amplifier U1BCA082 is grounded, and the first operational amplifier U1ACA082 is parallel with instead
Feed holds Cf, in parallel with the first operational amplifier U1ACA082 after feedback capacity Cf is in parallel with two concatenated feedback resistance Rf,
Resistance R3, the first operational amplifier U1ACA082 and second operational amplifier are parallel on second operational amplifier U1BCA082
U1BCA082 is upper in parallel there are two concatenated feedback resistance Rf and feedback capacity Cf, in parallel on the first operational amplifier input pin 2
Two feedback resistances and input pin 3 on the current limliting of capacitor C1 and resistance R1 composition is parallel between two feedback resistances in parallel
Circuit.
Micro-chip processor in the present embodiment selects ARM S3C2410 to handle chip, which uses ARM920T
Micro-processor kernel, the kernel have MMU function, with height 2MB piece internal program memory space, the processing integrated chip
USB interface, IIC and IIS interface, the pieces inner peripheral circuit such as LCD controller, keystroke interface, RTC, ADC and touch screen interface,
And the peripheral circuit can complete vibration detecting system needed for function.
One concrete application of the present apparatus are as follows: the probe 201 of piezoelectric transducer 2 is fixed on hair by binder first
It on the shell of motivation, then opens engine and turns on the power switch key 141, the probe of piezoelectric transducer 2 is with starting
It is vibrated during machine case vibration, probe 201 is during vibration, since clump weight 203 is there are inertia and used
Property under the action of occur delay displacement, and piezoelectric ceramic piece 202 with probe 201 vibration for be subjected to displacement when will be by clump weight
203 extruding deform and generate analog electrical signal, and analog electrical signal is transmitted to charge amplifier 206 by lead, due to pressure
The piezo-electric crystal of electroceramics piece 202 is both-end output, and selects both-end differential charge amplifier can be with insulation against ground, charge pair
Piezoelectric sensing element claim, differential type output is directly connected to, and improves anti-interference ability, and only experiences the differential defeated of the sensor
Enter charge signal and be converted into voltage signal, there is the ability for inhibiting common-mode voltage, thus by electromagnetic field and cable noise
Influence minimize, analog electrical signal after the amplification of charge amplifier 206 by data connecting line 21 be transmitted to A/D turn
Analog electrical signal is converted to digital signal and is transmitted in micro-chip processor 122 by parallel operation 121, A/D converter 121, micro process
Chip 122 exports vibration frequency figure, while the storage that micro-chip processor is integrated by display screen 11 after wavelet function converts
Device stores digital signal；Encapsulating shell is equipped with saving button 142, presses saving button 142, micro-chip processor will be present
The vibration frequency signal of this detection, the side of encapsulating shell are equipped with USB printing interface, can be by USB data line by hand-held number
It is connect according to processor 1 with printing device, pressing print button 143 can real time print this rhythm of engine figure；It is aobvious
Below display screen 11 be equipped with inquiry button 144, by inquiry button 144 can query history record vibration frequency information.
In the description of this specification, the description of reference term " one embodiment ", " example ", " specific example " etc. means
Particular features, structures, materials, or characteristics described in conjunction with this embodiment or example are contained at least one of the utility model
In embodiment or example.In the present specification, schematic expression of the above terms be not necessarily referring to identical embodiment or
Example.Moreover, particular features, structures, materials, or characteristics described can be in any one or more embodiment or examples
In can be combined in any suitable manner.
The preferred embodiment in the utility model disclosed above is only intended to help to illustrate the utility model.Preferred embodiment is simultaneously
There is no the details that detailed descriptionthe is all, also not limiting the utility model is only the specific embodiment.Obviously, according to this theory
The content of bright book can make many modifications and variations.These embodiments are chosen and specifically described to this specification, is in order to preferably
The principles of the present invention and practical application are explained, so that skilled artisan be enable to better understand and utilize this
Utility model.The utility model is limited only by the claims and their full scope and equivalents.
Claims (3)
1. a kind of automobile engine vibration frequency detection device, which is characterized in that including hand-held data processor and piezoelectric type
Sensor is connected between piezoelectric transducer and hand-held data processor by data connecting line；
The hand-held data processor includes encapsulating shell, is equipped with data line socket at the top of encapsulating shell, encapsulating shell bottom is equipped with
Serial ports is communicated, is fixed with PCB circuit board and battery inside encapsulating shell, battery is connect with PCB circuit board, and encapsulating shell front is set
There is display screen, key be equipped with below display screen, is fixed with A/D converter, micro-chip processor and communication module in PCB circuit board,
A/D converter and communication module are connect with micro-chip processor, and piezoelectric transducer is connect with A/D converter；
The piezoelectric transducer includes shell and probe, and probe bottom end is embedded in cover top portion, and probe bottom is equipped with working chamber,
From down toward piezoelectric ceramic piece, clump weight and spring leaf is had in working chamber, piezoelectric ceramic piece, clump weight and spring leaf are run through
Bolt be fixed on probe, be fixed with charge amplifier in the accommodating cavity of interior of shell, piezoelectric ceramic piece by lead-out wire with
Charge amplifier connection；
The charge amplifier include piezo-electric crystal, the first operational amplifier U1ACA082, second operational amplifier U1BCA082,
Feedback capacity Cf and feedback resistance Rf, two pins of piezo-electric crystal connect the input pin of the first operational amplifier U1ACA082 respectively
2 and input pin 3, capacitor CG, the first operational amplifier are accessed between piezo-electric crystal and the first operational amplifier U1ACA082
The output pin 1 of U1ACA082 connects the input pin 6 of second operational amplifier U1BCA082 and the route of connection is equipped with resistance R2, the
The input pin 5 of two operational amplifier U1BCA082 is grounded, and the first operational amplifier U1ACA082 is parallel with feedback capacity Cf, is fed back
, second operational amplifier in parallel with the first operational amplifier U1ACA082 after capacitor Cf is in parallel with two concatenated feedback resistance Rf
It is parallel with resistance R3 on U1BCA082, is parallel on the first operational amplifier U1ACA082 and second operational amplifier U1BCA082
Two concatenated feedback resistance Rf and feedback capacity Cf, on the first operational amplifier input pin 2 two feedback resistances in parallel and
The current-limiting circuit of capacitor C1 and resistance R1 composition is parallel on input pin 3 between two feedback resistances in parallel.
2. a kind of automobile engine vibration frequency detection device according to claim 1, which is characterized in that the encapsulation
It inwardly concaves to form grip part in the middle part of shell, grip part surface is equipped with anti-skid bulge.
3. a kind of automobile engine vibration frequency detection device according to claim 1, which is characterized in that micro- place
Managing chip selects ARM S3C2410 to handle chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821284389.7U CN208537174U (en) | 2018-08-09 | 2018-08-09 | A kind of automobile engine vibration frequency detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821284389.7U CN208537174U (en) | 2018-08-09 | 2018-08-09 | A kind of automobile engine vibration frequency detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208537174U true CN208537174U (en) | 2019-02-22 |
Family
ID=65378314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821284389.7U Expired - Fee Related CN208537174U (en) | 2018-08-09 | 2018-08-09 | A kind of automobile engine vibration frequency detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208537174U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110061710A (en) * | 2019-05-30 | 2019-07-26 | 杭州欧贲科技有限公司 | Highly integrated charge amplifier circuit |
| CN110426121A (en) * | 2019-09-13 | 2019-11-08 | 顺德职业技术学院 | A kind of motor or engine abnormal noise detection device and method |
| CN110617983A (en) * | 2019-10-12 | 2019-12-27 | 重庆工商大学 | Mechanical equipment fault diagnosis device capable of detecting vibration frequency |
-
2018
- 2018-08-09 CN CN201821284389.7U patent/CN208537174U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110061710A (en) * | 2019-05-30 | 2019-07-26 | 杭州欧贲科技有限公司 | Highly integrated charge amplifier circuit |
| CN110426121A (en) * | 2019-09-13 | 2019-11-08 | 顺德职业技术学院 | A kind of motor or engine abnormal noise detection device and method |
| CN110617983A (en) * | 2019-10-12 | 2019-12-27 | 重庆工商大学 | Mechanical equipment fault diagnosis device capable of detecting vibration frequency |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190222 Termination date: 20190809 |
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| CF01 | Termination of patent right due to non-payment of annual fee |