CN207662546U - A kind of surface acoustic wave sensor measuring motor turning torque - Google Patents
A kind of surface acoustic wave sensor measuring motor turning torque Download PDFInfo
- Publication number
- CN207662546U CN207662546U CN201820023500.0U CN201820023500U CN207662546U CN 207662546 U CN207662546 U CN 207662546U CN 201820023500 U CN201820023500 U CN 201820023500U CN 207662546 U CN207662546 U CN 207662546U
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- CN
- China
- Prior art keywords
- elastic shaft
- saw resonator
- acoustic wave
- surface acoustic
- motor turning
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Abstract
A kind of surface acoustic wave sensor measuring motor turning torque belongs to motor turning control detection field.It is made of elastic shaft, the first SAW resonator, the second SAW resonator, third SAW resonator, sensor pcb board and antenna.The utility model eliminates influence of the temperature to torque measurement using the second SAW resonator and third SAW resonator, and motor turning torque is accurately measured using the first SAW resonator.The utility model has the characteristics that wireless and passive transmission signal and combined innovation structure using surface acoustic wave techniques, to achieve the purpose that eliminate the interference that variation of ambient temperature measures torque signal, the accuracy of guarantee steering torque measurement.
Description
Technical field
The present invention relates to a kind of surface acoustic wave sensors measuring motor turning torque more particularly to a kind of wireless and passive to survey
Amount motor turning torque and the surface acoustic wave sensor for possessing temperature compensation function, belong to motor turning detection technique field.
Background technology
Steering torque is one of important process parameter of automobile steering system, and torque signal is steering mechanical movement shape
State monitors and the primary information resource of optimal control.Accurate torque measurement can provide science for the design of transmission device
Data carry out necessary monitoring and accident analysis to the mechanical movement situation of automobile steering system.
There are following several forms applied to the torque sensor of automobile steering system at present：Potentiometer type torque sensor,
It belongs to contact type measurement mode, and serious wear when due to its work causes its measurement accuracy not high, service life is shorter；Electricity
Sense formula torque sensor, belongs to non-contact measurement mode, due to containing magnetic element in structure, causes measurement result by temperature
Degree is affected；Electromagnetic torque sensor belongs to non-contact measurement mode, and due to simple in structure, dynamic property is good, institute
To be the most widely used torque sensor in current automobile steering system, but it is highly prone to external magnetic field interference, caused
Measurement accuracy reduces, if increasing electromagnetic shielding facility, and will increase its overall structure.
Therefore a kind of novel sensor for being applied to measure motor turning torque is urgently designed, to reach reduction sensor
Structure size reduces ambient temperature effect, improves the response speed of torque measurement and the purpose of sensitivity.Surface acoustic wave sensor
Have many advantages, such as that passive and wireless, small, precision is high, high sensitivity and anti-high interference ability are strong, is sensed based on this surface acoustic wave
The torque measurement techniques of device show unique advantage.
It is found after being retrieved to existing technical literature, although having based on passive wireless acoustic surface wave formula torque sensor knot
The correlative study of structure and principle, but tested shaft operating condition and design feature and automobile steering system difference are larger, so
There is not a kind of wireless and passive to measure motor turning torque at present and possesses the surface acoustic wave sensor of temperature compensation function.
Invention content
The present invention proposes a kind of wireless and passive and measures motor turning torque and possess the surface acoustic wave of temperature compensation function
Sensor, the sensor are mounted on the torsion bar of automobile steering system, input shaft and output shaft when for the rotation of measurement direction disk
Between torque, exist easily by temperature interference at least to solve the problem of that existing vehicle torsional moment sensor structure is complicated.
The technical solution adopted by the present invention is as follows：
A kind of surface acoustic wave sensor measuring motor turning torque, by elastic shaft, the first SAW resonator, second
SAW resonator, third SAW resonator, sensor pcb board and antenna composition.
The material that the elastic shaft uses is 60Si2Mn spring steel, a diameter of 25mm of elastic shaft, and there are one cut on elastic shaft
Scabble platform.
First SAW resonator is one port resonator, and centre frequency 437MHz, temperature control is
2.037kHz/ DEG C, strain sensitivity 1.931kHz/Micro-strain, it is pasted on the cutting platform of the elastic shaft, is pasted
Direction is in 45 ° with elastic shaft main shaft direction, and base material is single crystal quartz body.
Second SAW resonator, is one port resonator, centre frequency 435MHz, and temperature control is
15.545kHz/ DEG C, strain sensitivity 0.941kHz/Micro-strain, it is pasted on the cutting platform of the elastic shaft, is glued
It is in 30 ° that direction, which is pasted, with elastic shaft main shaft direction, and base material is single crystal quartz body.
The third SAW resonator, is one port resonator, centre frequency 433MHz, temperature control is-
15.548kHz/ DEG C, strain sensitivity 0.941kHz/Micro-strain, it is pasted on the cutting platform of elastic shaft, stickup side
To being in -30 ° with the elastic shaft axis direction, base material is single crystal quartz body.
The sensor pcb board material is resin material, and shape is rectangle, and printed thereon has signal processing circuit.
The antenna is made of antenna cap, antenna pedestal and conducting wire, and the antenna pattern is rodlike, is highly 3cm.
The technical solution adopted by the present invention operation principle is as follows：
When straight line traveling or idling, since driver does not rotate vehicle steering wheel, elastic shaft, will not by torsion
Occur elastic deformation, be pasted onto elastic shaft cutting platform on the first SAW resonator, the second SAW resonator and
Third SAW resonator is not energized, the first SAW resonator, the second SAW resonator and third sound table
Surface wave resonator is not energized that the signal frequency sent out is identical with centre frequency inherently, and antenna receives the first sound table
After the signal of surface wave resonator, the second SAW resonator and third SAW resonator, signal is transmitted to sensor PCB
Processing circuit on plate is handled, and sensor can export the not changed signal of torque after processing；
When driver turn steering wheel, elastic shaft is deformed upon by torsion, is pasted onto on elastic shaft cutting platform
The signal that first SAW resonator, the second SAW resonator and third SAW resonator are sent out after being activated
Frequency is different with the intrinsic frequency of itself, after antenna receives signal, by signal be transmitted to the processing circuit on sensor pcb board into
Row processing, sensor can export the signal of the change in torque detected after processing；
It is a kind of measure motor turning torque surface acoustic wave sensor eliminate temperature principle be that processing circuit receives day
After line sends the frequency signal of the first SAW resonator, the second SAW resonator and third SAW resonator,
The frequency signal of second SAW resonator and third SAW resonator is carried out difference by processing circuit, due to the rising tone
Surface resonator and third SAW resonator strain sensitivity having the same, different temperature control, after difference
Signal not only eliminate the influence of elastic shaft deformation, temperature control also improves one times, and measured temperature is more acurrate.Accurately
Temperature measurement can measure torque signal by resonator for the first sound surface and do temperature-compensating.
Compared with existing motor turning torque measurement techniques, what the present invention was reached has the beneficial effect that：
1) it is selected in the signal transmission form between antenna resonator wirelessly, it is peace to select which advantage
Fill convenient, flexible, not by device structure and spacial influence, simplify signal transmitting and receiving circuit, in addition, resonator itself have it is passive
The characteristics of, sensor battery without regular replacement, service life is long, substantially non-maintaining after installing successfully；
2) differential principle is utilized, the second SAW resonator and third SAW resonator are after difference, temperature
Sensitivity doubles, and is become apparent to the variation perception of environment temperature, can accurately detect environment temperature, antenna will be after difference
Signal be transmitted to processing circuit after, the torque signal that processing circuit is measured according to this first SAW resonator of signal pair carries out
Temperature-compensating, to keep torque measurement result more accurate.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram of the surface acoustic wave sensor of measurement motor turning torque of the present invention；
Fig. 2 is the SAW resonator that a kind of surface acoustic wave sensor of measurement motor turning torque of the present invention is pasted
Structural schematic diagram；
Fig. 3 is a kind of antenna structure view of the surface acoustic wave sensor of measurement motor turning torque of the present invention.
In figure：1 is elastic shaft；2 be the first SAW resonator；3 be the second SAW resonator；4 be third sound
Surface resonator；5 be sensor pcb board；6 be cutting platform；7 be antenna；8 be reflecting grating；9 be interdigital transducer；10 are
Quartz piezoelectric substrate；11 be antenna cap；12 be antenna pedestal；13 be conducting wire.
Specific implementation mode
Below in conjunction with the accompanying drawings, technical solution in the embodiment of the present invention is clearly fully described by.
Herein, it is also necessary to which explanation is a little to have obscured the present invention in order to avoid unnecessary details, in the accompanying drawings only
The apparatus structure closely related with scheme according to the present invention and/or processing step are only shown, and is had ignored and the present invention
The little other details of relationship.
A kind of surface acoustic wave sensor measuring motor turning torque, by elastic shaft 1, the first SAW resonator 2, the
Two SAW resonators 3, third SAW resonator 4, sensor pcb board 5 and antenna 7 form；
As shown in Figure 1, there is all to scabble platform among elastic shaft 1 of the present invention, first SAW resonator 2 is viscous
It is affixed on the cutting platform of the elastic shaft 1, it is in 45 ° to paste direction with 1 main shaft direction of the elastic shaft, the rising tone surface
Wave resonator 3 is pasted on the cutting platform of the elastic shaft 1, and it is in 30 ° to paste direction with 1 main shaft direction of the elastic shaft, institute
The cutting platform that third SAW resonator 4 is pasted on the elastic shaft 1 is stated, direction and 1 main shaft of the elastic shaft are pasted
Direction is in -30 °, and the sensor pcb board 5 is pasted onto on the cutting platform of the elastic shaft 1, pastes direction and the elastic shaft
1 main shaft is parallel, and the antenna 7 is fixed on the outside position parallel with 1 main shaft of the elastic shaft of the elastic shaft 1.
As shown in Fig. 2, the first SAW resonator 2 of the present invention, the second SAW resonator 3 and third sound
Surface resonator 4 is made of reflecting grating 8, interdigital transducer 9, quartz piezoelectric substrate 10.
As shown in figure 3, antenna 7 of the present invention is made of antenna cap 11, antenna pedestal 12 and conducting wire 13, the conducting wire 13 1
End is connected on the antenna pedestal 12, and the other end is connected on the sensor pcb board 5.
Compensation schemes
Second SAW resonator 3 and the third SAW resonator 4 temperature control after difference
Double for：
15.545- (- 15.548)=31.093kHz/ DEG C
The second SAW resonator 3 and third SAW resonator 4 is differentiated is to difference on the frequency：
Δ f=f2-f3
Wherein, f2And f3Respectively described second SAW resonator 3 and the third SAW resonator 4 are real-time
The frequency measured.
Measuring environmental change temperature is：
So a kind of surface acoustic wave sensor output frequency measuring motor turning torque is represented by：
F=f1-2.037×ΔT
Wherein, f1For the centre frequency of first SAW resonator 2.
Claims (4)
1. a kind of surface acoustic wave sensor measuring motor turning torque, it is characterised in that it is by elastic shaft (1), the first sound surface
Wave resonator (2), the second SAW resonator (3), third SAW resonator (4), sensor pcb board (5) and antenna
(7) it forms；
The elastic shaft (1), there are one cutting platforms (6) on the elastic shaft (1)；
First SAW resonator (2), is one port resonator, centre frequency 437MHz, and temperature control is
2.037kHz/ DEG C, strain sensitivity 1.931kHz/Micro-strain, it is pasted on the cutting platform (6) of elastic shaft (1), is glued
The main shaft direction for pasting direction and the elastic shaft (1) is in 45 °, and base material is single crystal quartz body；
Second SAW resonator (3), is one port resonator, centre frequency 435MHz, and temperature control is
15.545kHz/ DEG C, strain sensitivity 0.941kHz/Micro-strain, it is pasted on the cutting platform (6) of elastic shaft (1),
It is in 30 ° to paste direction with the elastic shaft (1) main shaft direction, and base material is single crystal quartz body；
The third SAW resonator (4), is one port resonator, centre frequency 433MHz, temperature control is-
15.548kHz/ DEG C, strain sensitivity 0.941kHz/Micro-strain, it is pasted on the cutting platform (6) of elastic shaft (1),
It is in -30 ° to paste direction with the elastic shaft (1) main shaft direction, and base material is single crystal quartz body；
The sensor pcb board (5) is pasted onto on the cutting platform (6) on the elastic shaft (1), pastes direction and the elasticity
Axis (1) main shaft is parallel；
The outside that the antenna (7) is fixed on the elastic shaft (1) is parallel with the elastic shaft (1) main shaft.
2. a kind of surface acoustic wave sensor measuring motor turning torque according to claim 1, it is characterised in that：It is described
Elastic shaft (1) its material is 60Si2Mn spring steel, a diameter of 25mm, and the elastic shaft (1) has all to scabble platform (6) to be located at institute
State elastic shaft middle-end center, cutting depth 0.5mm.
3. a kind of surface acoustic wave sensor measuring motor turning torque according to claim 1, it is characterised in that：It is described
The material that sensor pcb board (5) uses is resin material, and shape is rectangle.
4. a kind of surface acoustic wave sensor measuring motor turning torque according to claim 1, it is characterised in that：It is described
Antenna (7) is made of antenna cap (11), antenna base (12) and conducting wire (13), and the antenna pattern is rodlike, is highly
3cm。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820023500.0U CN207662546U (en) | 2018-01-08 | 2018-01-08 | A kind of surface acoustic wave sensor measuring motor turning torque |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820023500.0U CN207662546U (en) | 2018-01-08 | 2018-01-08 | A kind of surface acoustic wave sensor measuring motor turning torque |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207662546U true CN207662546U (en) | 2018-07-27 |
Family
ID=62943350
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820023500.0U Expired - Fee Related CN207662546U (en) | 2018-01-08 | 2018-01-08 | A kind of surface acoustic wave sensor measuring motor turning torque |
Country Status (1)
| Country | Link |
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| CN (1) | CN207662546U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109374157A (en) * | 2018-09-14 | 2019-02-22 | 北京遥测技术研究所 | A kind of surface acoustic wave pressure sensor based on loss detection |
-
2018
- 2018-01-08 CN CN201820023500.0U patent/CN207662546U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109374157A (en) * | 2018-09-14 | 2019-02-22 | 北京遥测技术研究所 | A kind of surface acoustic wave pressure sensor based on loss detection |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180727 Termination date: 20190108 |