CN103635956B - For the method and apparatus of the active damping of acoustic transducer - Google Patents
For the method and apparatus of the active damping of acoustic transducer Download PDFInfo
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- CN103635956B CN103635956B CN201280026994.3A CN201280026994A CN103635956B CN 103635956 B CN103635956 B CN 103635956B CN 201280026994 A CN201280026994 A CN 201280026994A CN 103635956 B CN103635956 B CN 103635956B
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- 238000013016 damping Methods 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims description 31
- 230000010355 oscillation Effects 0.000 claims description 30
- 238000001514 detection method Methods 0.000 claims description 7
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims 1
- 238000005259 measurement Methods 0.000 description 15
- 230000001052 transient effect Effects 0.000 description 10
- 230000005284 excitation Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 230000008859 change Effects 0.000 description 5
- 238000012545 processing Methods 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- 230000003321 amplification Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000010363 phase shift Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
- G10K9/12—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated
- G10K9/122—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated using piezoelectric driving means
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Gyroscopes (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
The present invention realizes a kind of active damping for nearly all acoustic transducer, wherein determines the current vibration amplitude of described acoustic transducer and in described acoustic transducer, applies antihunt signal according to described current vibration amplitude.Propose according to the present invention for this reason, in detecting step (220), cause and measure the phase rotating of vibration of described acoustic transducer preferably by potential pulse targetedly.Implement the calculating of current vibration amplitude by means of known parameter, described parameter involving vibrations is causing the phase rotating in moment and the phase position of phase rotating.Can produce according to now known current vibration amplitude and regulate described antihunt signal again.
Description
Technical field
The present invention relates to a kind of method of the active damping for acoustic transducer, described acoustic transducer is in order to such as be used in vehicle by means of acoustic signal scanning surrounding environment.The invention still further relates to a kind of device for realizing such method.
Background technology
In art field of the present invention, known following methods in the field of that is acoustic scan of environment around: described method is included in surrounding environment and sends pulse and be received in the pulse of there reflection, can infer the spacing with target by analyzing and processing.
The converter used is the chaffy acoustic transducer of tool, and described diaphragm has certain mass necessarily, and wherein diaphragm also has elastic force, thus produces transient state vibration behavior.Piezoelectric transducer has identical behavior for its piezoelectric layer.Transient state vibration after prior excitation is less desirable for a variety of reasons, especially due to the minimum spacing determined thus of surrounding environment measurement, because only when vibrating (result as excitation in advance) and decaying as far as possible, converter just can be used as the receiver of the sound reflected in target.Distance with converter is less than to the target of minimum interval, the sound wave reflected also to arrive on diaphragm and can not carry out distinguishing with transmission pulse and can not be identified thus due to the transmission pulse remained shock also existed during transient state vibration duration.
Therefore it is known that additionally carry out damped diaphragm by means of damping element passively except self-damping, wherein such as foam is used.But, to thus significantly reduce on two conversion directions, sensitivity when namely sending and receive acoustic impluse.
Such as known by application DE10136628A1: active damping diaphragm, its mode is, vibrate to suppress transient state and apply contrary signal on the switch, what wherein said antihunt signal and transient state were vibrated superpose causes amplitude to reduce.Active damping for reduce send acoustic energy rear film transient state vibration duration and therefore earlier rebuild sensor reception prepare.At this, the length of transient state vibration duration determines that the most I between sensor and barrier measures spacing.
In addition, there is known method for the active damping of acoustic transducer or device by DE102010039017.Detect the antihunt signal that the current vibration frequency of converter and applying have the frequency identical with detected current vibration frequency there.
Known sensor for the acoustic scan of the surrounding environment of vehicle is made up of acoustic transducer and the electronic installation for controlling acoustic transducer.Acoustic transducer is made up of aluminium pot and the piezoelectric element be fixed in described aluminium pot again.The equivalent circuit diagram of acoustic transducer is shown in Figure 1 and comprise by R, L and C
serthe serial oscillation loop of composition and shunt capacitance C
par.Oscillation Amplitude is presented as the amplitude of the electric current flowing through inductance L and not directly measures on the terminal of acoustic transducer in the equivalent circuit diagram of acoustic transducer.
By shunt capacitance C
paron the direct measurement of voltage can infer the amplitude of the electric current in inductance L.But except the amplification factor of used measurement/analyzing and processing circuit, the value of all components of equivalent electrical circuit must be known for this reason.These values depend on environmental impact and manufacturing tolerance consumingly and therefore cannot enough accurately illustrate.
Therefore, the measurement of current vibration amplitude or the A/D converter in order to Oscillation Amplitude measurement use routine is saved by the method that prior art is known.This has following shortcoming: the use of A/D converter is in order to determine that Oscillation Amplitude needs extra hardware spending.
If current vibration amplitude is unknown, then cannot during range observation the parameter of damping adjusting signal again, but these parameters must be asked at calibration phase.This reduces the degree of accuracy of distance measurement.
Summary of the invention
The present invention can realize the active damping of nearly all acoustic transducer, wherein determines the current vibration amplitude of acoustic transducer and in acoustic transducer, applies antihunt signal according to described current vibration amplitude.
The invention has the advantages that, can when there is no extra hardware expense---such as when A/D converter and ask for the current vibration amplitude of converter with pinpoint accuracy and high time resolution when not knowing each value of equivalent electrical circuit.
, propose according to the present invention for this reason, cause targetedly preferably by potential pulse in detecting step and measure the phase rotating of vibration of acoustic transducer.Implement the calculating of current vibration amplitude by means of known parameter, described parameter comprises phase rotating and the phase position in the moment of described vibration before phase rotating.Can produce and damping adjusting signal again according to now known current vibration amplitude.
Preferably, at this according to the duration of the current vibration amplitude adjusted antihunt signal of converter and/or amplitude.Realize the quick of acoustic transducer thus and efficient active damping.Can carry out having pinpoint accuracy and the scanning of high-resolution surrounding environment thus, because obtain the little minimum spacing by the object that scans and sensor by the of short duration state vibration duration of final generation.
Preferably cause phase rotating, its mode applies potential pulse in acoustic transducer.Described potential pulse is not being applied corresponding to the moment of the friendship zero of converter Oscillation Amplitude.Potential pulse causes the phase rotating of the vibration of converter, measures described phase rotating and can calculate current vibration amplitude by described phase rotating.
Potential pulse is preferably formed by a single edge or by one or more rectangle half-wave.This has the following advantages: not only edge but also rect.p. can produce simply and be applied in acoustic transducer.The higher hamonic wave that multiple half-waves preferably with the frequency of the current vibration frequency corresponding to converter produce due to smaller amounts and obtain determining the more pinpoint accuracy of current vibration amplitude.More the vibration of high-order is called higher hamonic wave, and it passes through in acoustic transducer, apply potential pulse generation and it can disturb measurement and the infringement degree of accuracy of current vibration amplitude.By applying, by the potential pulse of multiple half wave component, to make the impact of higher hamonic wave minimize.In this case, the passive damping of oscillation circuit should be considered when calculating current vibration amplitude.
Preferably, be provided with additional detecting step, wherein the current vibration frequency (resonance frequency) of detection of acoustic converter for this reason.This can such as be realized by the measuring method known by prior art.
Antihunt signal depends on current vibration amplitude according to the present invention and is preferably applied on converter with current vibration frequency.Obtain the damping of the further optimization of converter vibration thus.
The present invention realizes by means of a kind of device of the active damping for acoustic transducer.Described device has pick-up unit, and it is connected with converter.Described pick-up unit can ask for current vibration amplitude, its mode is, described pick-up unit particularly by means of digit phase indicator, clock control counter and hand over zero recognizer, summit measurement mechanism or other mechanisms carry out the measuring-signal that analyzing and processing comes from converter, described measuring-signal comprises the information of the phase rotating of the vibration about converter, to ask for the phase position of signal.Described pick-up unit is arranged for detecting the relative phase positions between two or more same signal change procedure, preferably hands over zero.
Described device also comprises signal generator, its be connected with converter and with for determining that the pick-up unit of current vibration amplitude is connected.Signal generator can produce potential pulse and is applied on converter, and described potential pulse produces the phase rotating of converter vibration.Signal generator can produce damping pulse in addition, wherein signal generator consider when producing damping pulse before the current vibration amplitude that received by pick-up unit and phase position and duration and/or the amplitude of damping pulse are such as provided according to described current vibration amplitude and phase position.The vibration that signal generator can revolt converter at least partly in addition in phase place operably provides damping pulse.Signal generator is by being applied to for generation of the potential pulse of phase rotating and damping pulse on converter with the connection of converter.Alternatively, described device also can comprise different signal generators, and they are connected with converter, be wherein respectively equipped with for generation of pumping signal, for the phase rotating that causes converter to vibrate and for generation of the signal generator of antihunt signal.
According to a kind of preferred implementation, described device comprises storer, and can store the Oscillation Amplitude of current detection in which memory, wherein storer is also connected with signal generator, described signal generator can call current vibration amplitude, to provide damping pulse according to Oscillation Amplitude.Signal generator can be binary or ternary output stage, and wherein ternary output stage is also switched in high internal resistance in zero condition.
In a preferred embodiment, pick-up unit is additionally arranged for detecting converter or coming from the current vibration frequency of measuring-signal of converter.This can such as be realized by ranging pulse, by described ranging pulse excitation transducer and detect the self-excited oscillation frequency of converter by pick-up unit in short time.These additional informations can be used, to apply there is current vibration frequency but the damping pulse of substantially contrary phase position on the switch, obtain the damping of the further improvement of converter thus.
Accompanying drawing explanation
Fig. 1 illustrates the equivalent circuit diagram of acoustic transducer;
The vibration of Fig. 2 acoustic transducer shown in polar plot;
Fig. 3 shown in polar plot according to the vibration of the acoustic transducer of prior art and active damping;
Fig. 4 a illustrates the potential pulse for damping acoustic converter according to the first embodiment of the present invention;
Fig. 4 b shown in polar plot according to the vibration of the acoustic transducer of the first embodiment of the present invention and the active damping by means of the potential pulse in Fig. 4 a;
Fig. 5 a illustrates the potential pulse for damping acoustic converter according to a second embodiment of the present invention;
Fig. 5 b is at the vibration of acoustic transducer according to a second embodiment of the present invention shown in polar plot and the active damping by means of the potential pulse in Fig. 5 b;
Fig. 6 schematically shows the embodiment according to device of the present invention;
Fig. 7 illustrates the diagram for illustrating further according to method of the present invention.
Embodiment
Fig. 1 illustrates equivalent electrical circuit Fig. 1 of acoustic transducer.It comprises by R, L and C
serthe serial oscillation loop of composition and shunt capacitance C
par.The Oscillation Amplitude of described acoustic transducer shows as the electric current I flowing through inductance L in the equivalent circuit diagram of acoustic transducer
lamplitude.
Fig. 2 in polar plot 2 as counterclockwise along the direction of arrow 80 with angular velocity omega
0the vector 10 rotated illustrates the vibration of described acoustic transducer.Angular velocity omega
0directly by equation ω
0=2 π f
0with the resonance frequency f of acoustical convertor
0be associated.The length of vector 10 at this corresponding to the voltage U handed at electric current in zero point in inductance L
max.During a vibration period, the tip of voltage vector 10 describes the circular trace 20 illustrated.The horizontal ordinate of figure relates to the voltage U in inductance L
l, ordinate relate to flow through inductance L with ω
0the standardized electric current I of L
l.Electric current I
lthe tolerance of the current vibration amplitude of acoustic transducer.Vibration passes through the phase angle between arrow 10 and the horizontal ordinate of figure at the current phase position of moment t
represent.In order to simplify the passive damping not illustrating and caused by resistance R in this figure and figure subsequently.When considering passive damping, vector length reduces exponentially and vector tip does not describe circular trace and describes log spiral.
The active damping of acoustic transducer is according to conventional methods shown according to the polar plot 2 introduced in fig. 2 in figure 3.In vibration or the electric current I flowing through inductance L
lfriendship zero moment and amplitude U
bvoltage inversion ground control described acoustic transducer.By arrow 30, described potential pulse is shown in the drawings.Obtain new circular trace 22, it has and reduces value U
bradius 12.This is corresponding to the Oscillation Amplitude of described acoustic transducer, and it is less than the Oscillation Amplitude before applying antihunt signal.By flowing through the electric current I of inductance L
lfriendship zero moment anti-phase control acoustic transducer obtain the damping of maximum possible.By the electric parameter U in oscillation circuit
land I
lthe vibration phase position represented is constant in this maintenance, as can by the parallel orientation identification of arrow 10 and 12 in polar plot 1.
Fig. 4 illustrates the detecting step of the first embodiment according to damping method of the present invention.Fig. 4 b represents the vibration according to the converter of equivalent circuit diagram in polar plot 3 at this.Not in vibration or electric current I
lfriendship zero in control acoustic transducer, and corresponding to vibration phase angle
moment t
1control acoustic transducer, illustrated by voltage vector 10.If the potential pulse 40 illustrated in fig .4 in the described moment is to have amplitude U
bthe form at edge be applied in acoustic transducer, then except damping less compared with control shown in Figure 3, also obtain the phase rotation angle of the electric parameter in oscillation circuit
.Potential pulse 40 in polar plot 3 by having amplitude U
barrow 30 represent.Vibration for acoustic transducer obtains having amplitude a
2voltage vector 14, corresponding to circular trace 24.Applying potential pulse 40 before or afterwards can as follows by known parameter
with
calculate the Oscillation Amplitude of acoustic transducer.
Oscillation Amplitude a
1before applying potential pulse 40:
Oscillation Amplitude a
2after applying potential pulse 40:
Subsequently can by calculated amplitude a
1and/or a
2the duration of antihunt signal is determined when having or not there is pre-resistor.In addition, can as calculated amplitude a
1and/or a
2in the amplitude of the function determination antihunt signal of at least one.Advantageously, compare the amplitude in the amplitude when pre-test and the range observation cycle of to implement before, and mate duration and/or the amplitude of antihunt signal according to determined change linearly.Active damping can be implemented by conventional methods by the substantially anti-phase control of acoustic transducer.Alternatively, the amplitude calculated also can be used as the basis of the additive method of the damping of remained shock, such as, for the method according to DE102010062930.8.
Fig. 5 a and 5b illustrates the detecting step of the second embodiment according to damping method of the present invention.As illustrated in fig 5 a, substitute single edge and use the potential pulse 50 be made up of two rectangle half-waves, i.e. a positive half-wave 52 and a negative half-wave 54.The frequency of pulse 50 equals the vibration frequency f of converter vibration in described example
0.This means, the end moment t of potential pulse 50
3with start time t
1between difference just equal the cycle time T=1/f of the vector in polar plot 4
0, wherein f
0it is the vibration frequency of converter.Therefore the end moment t of the first half-wave 52
2circulate corresponding in half vector.
As shown in polar plot 4 in figure 5b, obtain three damping arrows 36,37 and 38 by the form of potential pulse 50.At moment t
1(corresponding to phase position
) apply that there is amplitude+U on the switch
bvoltage 55.As apparent in polar plot 4, like this and the example class described in the diagram, cause original amplitude a
1damping (being illustrated by arrow 10) and angle
phase rotating, thus the Oscillation Amplitude in polar plot 4 to be obtained corresponding to amplitude a
2arrow 14.At moment t
2apply voltage-U on the switch
b.This changes 56 value-2U corresponding to voltage
b.As apparent in polar plot 4, representative converter is at moment t
2the voltage vector 16 of vibration rotate 180 ° (corresponding to t relative to voltage vector 14
1and t
2between time period in half cycles).Voltage changes 56 and causes further damping and angle
phase step.Thus at moment t
2after applying voltage 56, obtain that there is amplitude a
4voltage vector 18.At moment t
3, the voltage of applying turns back to zero, corresponding to+U
bchange in voltage 57.T
2with t
3between time period again corresponding to the circulation of half vector or half vibration period T of converter.Converter is at moment t
3vibration represented by voltage vector 19, it have rotated 180 ° relative to voltage vector 18.The applying of change in voltage 57 causes further damping and the angle of Oscillation Amplitude
phase step.Voltage vector 15 is obtained in polar plot 4.Voltage vector 15 has phase shift compared with voltage vector 10
this is corresponding to the phase rotating of converter vibration, and it causes by applying potential pulse 50.
Phase rotating can be asked for by the measurement with pinpoint accuracy
.Can by phase rotating
calculate current vibration amplitude a
1(or calculate a according to potential pulse
2n+1).Must consider at this passive damping that caused by resistance R, it does not illustrate for reason clearly in polar plot 4.The calculating of amplitude is suitable for having amplitude U usually
bthe potential pulse of multiple half-waves, n illustrates the quantity of half-wave at this.Be suitable at this:
Be suitable at this:
wherein
represent the passive damping constant of oscillation circuit.Parameter can be determined
, its mode is, excited oscillation loop and measure the transient oscillation duration when not having active damping.Subsequently, after failure of oscillation, again measure the transient oscillation duration equally with k amplitude excitation oscillation circuit doubly.Can by the poor dt of two transient state vibration durations according to following formulae discovery damping constant:
Alternatively, can by determining variable according to about known method by the calculating of the parameter of equivalent electrical circuit
.
Figure 6 illustrates the schematic circuit of a preferred implementation according to the device for active damping of the present invention.Described device comprises converter 100, and it has two links 102,104.On the one hand, these links are connected with the signal generator 110 of device, and described signal generator encourages described converter.Signal generator 110 is constructed according to the invention for applying potential pulse on link 102 and 104, and described potential pulse moves angle relative to the vibration phase of diaphragm
and cause the angle of diaphragm vibration
phase rotating.This can carry out during the excitation phase of converter or at the excitation interval of converter.
In addition, link 102,104 is connected with pick-up unit 120 according to the present invention, and wherein link 102,104 provides a signal, the motion of the diaphragm of described signal reflection converter 100 in the excitation phase of signal generator 110 or excitation interval.Described motion by pick-up unit 120 by detecting with the connection of link 102,104.Pick-up unit 120 comprises phase detection unit 124, can detect phase information, the particularly phase shift of the signal be applied on link 102,104 by means of described phase detection unit.Pick-up unit also has frequency measurement unit 122, and it allows pick-up unit 120 to detect the frequency of the signal on link 102,104.
Can be measured with considerable accuracy when the working time of the component participating in measurement is constant phase rotating
.Phase detection unit 124 comprises the digit phase indicator such as carried in digital circuit for this reason.Can measure in the following manner: be used for causing phase rotating in realization
the moment t of potential pulse
1make the curent change course synchronization in electrogoniometer and inductance L before.During applying potential pulse, digit phase indicator comprises electric current I
lat moment t
1original phase position
.In esse phase position is determined according to antihunt signal
and the content of itself and digit phase indicator is compared.The difference of two values is corresponding to the phase rotating caused by potential pulse
.At this, the component of the equivalent electrical circuit of acoustic transducer and the value of the amplification factor of measuring amplifier that uses are on measurement not impact.
Frequency or phase detection unit 122,124 preferably also comprise the detector for identifying same signal change procedure, such as, hand over zero detector, so that the phase position detected between two friendships zero and Cycle Length.Detecting unit 122,124 can use common friendship zero detector.
By transmitting the Oscillation Amplitude, phase position and the vibration frequency that detects that detect to the connection of signal generator 110, described signal generator provides damping pulse according to Oscillation Amplitude, frequency and phase position, the motor behavior of described damping pulse resistance converter 100.Controller 130 can also be comprised, its control signal generator 110, to produce driving pulse, damping pulse and ranging pulse by signal generator 110 in the corresponding moment according to device of the present invention.In the embodiment substituted of embodiment representing Fig. 6, pick-up unit 120 not (only) is connected with signal generator 110 but is connected with controller 130, described controller process amplitude information, frequency information and phase information and correspondingly control signal generator 110.
Fig. 7 illustrates the method according to the damping for described acoustic transducer of the present invention as flow process Figure 200.In step 210, by providing driving pulse to encourage described converter to vibrate.In detecting step 220, by moment t
1the potential pulse phase rotating that causes converter to vibrate.Measure phase rotating, and calculate current vibration amplitude thus.Produce antihunt signal according to current vibration amplitude, the vibration that described antihunt signal revolts converter at least in part runs and is provided to converter in step 230.Because produce antihunt signal according to the current vibration amplitude of converter, so the duration of antihunt signal and/or amplitude can be made to be matched with the vibration of converter, thus produce quick and damping completely.
Alternatively, the measurement of the amplitude that (going back) exists can be carried out subsequently after prior implementation section active damping, to determine the quality of the active damping carried out and the parameter of present last active damping subsequently.Such measurement such as can be carried out as follows: the excitation (corresponding to step 210) of vibration, according to the part active damping of described method and amplitude measurement (220) and last active damping (230).
Claims (13)
1., for a method for the active damping of acoustic transducer, described method has following steps:
By providing driving pulse to encourage described converter to described converter;
By providing antihunt signal to carry out converter described in damping, described antihunt signal revolts the oscillating movement of described converter at least in part,
It is characterized in that,
Be provided with detecting step, by means of the phase rotating of the vibration of described acoustic transducer in described detecting step
determine the current vibration amplitude a of described acoustic transducer
1, a
2, a
2n+1and according to described current vibration amplitude a
1, a
2, a
2n+1produce described antihunt signal, wherein, n represents the quantity of half-wave at this.
2. method according to claim 1, is characterized in that, by the current vibration amplitude a of described acoustic transducer
1, a
2, a
2n+1calculate the duration of described antihunt signal.
3. method according to claim 1, is characterized in that, by the current vibration amplitude a of described acoustic transducer
1, a
2, a
2n+1calculate the amplitude of described antihunt signal.
4. according to the method in any one of claims 1 to 3, it is characterized in that, not corresponding to the moment t of the friendship zero of described Oscillation Amplitude
1described phase rotating is caused by potential pulse (40,50)
described potential pulse is applied in described acoustic transducer.
5. method according to claim 4, is characterized in that, described potential pulse (40,50) is formed by a single edge or by one or more rectangle half-wave (52,54).
6. method according to claim 1, is characterized in that, described method comprises additional detecting step, detects the current vibration frequency of described converter in described additional detecting step.
7. method according to claim 6, is characterized in that, potential pulse (50) that apply the frequency of the current vibration frequency detected had corresponding to described converter, that be made up of half-wave (52,54).
8. the method according to claim 6 or 7, is characterized in that, applies the antihunt signal of the frequency of the current vibration frequency detected had corresponding to described converter.
9., for a device for the active damping of acoustic transducer (100), described device comprises:
Pick-up unit (120), it can be connected with acoustic transducer (100) and arrange for the phase rotating by means of the vibration of described converter (100) to detect the current vibration amplitude of described acoustic transducer (100);
Signal generator (110), it can be connected with described converter (100) and be connected with described pick-up unit (120), wherein, described signal generator (110) arranges and is used for applying antihunt signal on described converter (100), and described antihunt signal revolts the oscillating movement of described converter at least in part;
Wherein, described antihunt signal depends on detected Oscillation Amplitude.
10. device according to claim 9, wherein, described pick-up unit (120) additionally arranges and is used for the current vibration frequency that detection comes from the measuring-signal of described converter (100), and the antihunt signal with detected vibration frequency is produced.
11. devices according to claim 9 or 10, wherein, described device comprises controller (130), and described controller arranges and is used for receiving amplitude information and/or frequency information and/or phase information from described pick-up unit (120) and controlling described signal generator (110) according at least one these information.
12. 1 kinds of sensors, it comprises:
Acoustic transducer;
For the device of the active damping of the acoustic transducer according to any one of claim 9 to 11.
13. sensors according to claim 12, described sensor is the sonac of the acoustic scan for surrounding environment.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102011076686A DE102011076686A1 (en) | 2011-05-30 | 2011-05-30 | Method and device for active damping of an acoustic transducer |
| DE102011076686.3 | 2011-05-30 | ||
| PCT/EP2012/057362 WO2012163598A1 (en) | 2011-05-30 | 2012-04-23 | Method and appparatus for actively damping an acoustic transducer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103635956A CN103635956A (en) | 2014-03-12 |
| CN103635956B true CN103635956B (en) | 2016-03-16 |
Family
ID=45998373
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201280026994.3A Active CN103635956B (en) | 2011-05-30 | 2012-04-23 | For the method and apparatus of the active damping of acoustic transducer |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2715714B1 (en) |
| CN (1) | CN103635956B (en) |
| DE (1) | DE102011076686A1 (en) |
| WO (1) | WO2012163598A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3208634B1 (en) | 2016-02-17 | 2018-08-15 | ELMOS Semiconductor Aktiengesellschaft | Ultrasound measuring system, in particular for distance measurement and/or as parking aid in vehicles |
| DE102017207679A1 (en) * | 2017-05-08 | 2018-11-08 | Robert Bosch Gmbh | Operating method and control unit for an ultrasound transceiver, ultrasound transceiver and work device |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2813729C2 (en) * | 1978-03-30 | 1979-08-16 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Method and circuit arrangement for the excitation of ultrasonic transducers which are used in pulse-echo technology |
| DE19605502C1 (en) * | 1996-02-14 | 1997-04-24 | Fraunhofer Ges Forschung | Ultrasonic transducer for distance measurement |
| DE10136628B4 (en) | 2001-07-26 | 2006-04-20 | Valeo Schalter Und Sensoren Gmbh | Ultrasonic transducer for emitting and receiving ultrasonic waves by means of a membrane, method and control device for operating the ultrasonic transducer, and use of the ultrasonic transducer |
| US8077874B2 (en) * | 2006-04-24 | 2011-12-13 | Bose Corporation | Active noise reduction microphone placing |
| DE102009000719B4 (en) * | 2009-02-09 | 2019-12-12 | Robert Bosch Gmbh | Electrical damping of a mechanically oscillating component |
| DE102010039017B4 (en) | 2010-08-06 | 2017-09-21 | Robert Bosch Gmbh | Method and device for active damping of an acoustic transducer |
| DE102010062930A1 (en) | 2010-12-13 | 2012-06-14 | Robert Bosch Gmbh | Method for detecting an object in an environment and device for generating an ultrasound signal |
-
2011
- 2011-05-30 DE DE102011076686A patent/DE102011076686A1/en not_active Withdrawn
-
2012
- 2012-04-23 CN CN201280026994.3A patent/CN103635956B/en active Active
- 2012-04-23 EP EP12716016.6A patent/EP2715714B1/en active Active
- 2012-04-23 WO PCT/EP2012/057362 patent/WO2012163598A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| CN103635956A (en) | 2014-03-12 |
| DE102011076686A1 (en) | 2012-12-06 |
| EP2715714A1 (en) | 2014-04-09 |
| WO2012163598A1 (en) | 2012-12-06 |
| EP2715714B1 (en) | 2015-12-16 |
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