CN106080526B - A kind of automobile rearview mirror based on Lamb wave removes sleet frost method and device automatically - Google Patents
A kind of automobile rearview mirror based on Lamb wave removes sleet frost method and device automatically Download PDFInfo
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- CN106080526B CN106080526B CN201610625479.7A CN201610625479A CN106080526B CN 106080526 B CN106080526 B CN 106080526B CN 201610625479 A CN201610625479 A CN 201610625479A CN 106080526 B CN106080526 B CN 106080526B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
- B60S1/00—Cleaning of vehicles
- B60S1/02—Cleaning windscreens, windows or optical devices
- B60S1/56—Cleaning windscreens, windows or optical devices specially adapted for cleaning other parts or devices than front windows or windscreens
- B60S1/60—Cleaning windscreens, windows or optical devices specially adapted for cleaning other parts or devices than front windows or windscreens for signalling devices, e.g. reflectors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
- B60S1/00—Cleaning of vehicles
- B60S1/02—Cleaning windscreens, windows or optical devices
- B60S1/023—Cleaning windscreens, windows or optical devices including defroster or demisting means
- B60S1/026—Cleaning windscreens, windows or optical devices including defroster or demisting means using electrical means
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- Mechanical Engineering (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
- Rear-View Mirror Devices That Are Mounted On The Exterior Of The Vehicle (AREA)
Abstract
A kind of automobile rearview mirror based on Lamb wave removes sleet frost method and device automatically, emits the detection Lamb wave from top to bottom propagated along the minute surface of backsight eyeglass, when wave amplitude changes, except sleet frost Lamb wave pushes raindrop to be detached from backsight eyeglass minute surface；Or, sleet frost Lamb wave is removed along what the minute surface setting of backsight eyeglass was from top to bottom propagated, piezoelectric ceramic transducer patch generates heat, it is liquid water so that snow, ice or frost on the minute surface of backsight eyeglass and the critical surface of accumulated snow, solidifying ice or frosting is melted, and snow, ice or frost is pushed to be detached from the minute surface of backsight eyeglass.This method and device are utilized except sleet frost Lamb wave pushes raindrop, accumulated snow, solidifying ice or frosting to be detached from backsight eyeglass minute surface, the phenomenon that minute surface coagulates mist no matter is not had against the wind with the wind to occur, be inherently eliminated rainy day and winter rearview mirror it is fuzzy caused by security risk.
Description
Technical field
The present invention relates to a kind of automobile rearview mirrors to remove sleet frost method and device, more particularly to blue nurse ultrasonic wave automatically.
Background technology
Automobile rearview mirror is the important component in automotive safety configuration, is provided rear vehicle condition, road conditions judgement for driver
Important auxiliary foundation, it is clearly totally vital to keep rearview mirror.But on rainy day or foggy weather, rearview mirror very
It is easy to hang up many water droplets, minute surface becomes to obscure very much, and driver can only see roughly rear vehicle condition, influence driver to spacing
Judgement, to overtaking other vehicles and road brings comparable trouble, there are serious traffic safety hidden danger.Or in northern cold winter,
On rearview mirror can accumulated snow, solidifying ice or frosting, the existing stage can only manual deicing defrosting, cause prodigious fiber crops before being travelled to driver
It is tired.
Presently, also nothing provides the vapour that rearview mirror hangs up raindrop or icing frosting influences the absolute solution of traffic safety
Depot quotient.For automobile rearview mirror except this problem of rain, generally there are following several solutions at present：
One, traditional method --- install rearview mirror rain eyebrow additional.Due to the thickness of rain eyebrow, if in rearview mirror frame
If side, the adjusting of rearview mirror can be influenced, therefore is typically mounted at outside.This method effect when inverse rain travels is pretty good,
But along if the force of rain is driven, on minute surface or it can be stained with rainwater, and due to being sticked on rearview mirror using glue, have de-
The risk fallen；
Two, the method for household --- smear water removal object.What is be typically chosen is the article with surfactant, as soap,
Liquid detergent, toothpaste etc..In this way the advantages of is economical convenient, but disadvantage is also obvious, after smearing water removal object, after
Raindrop are not hung on visor eyeglass not, but form water membrane, can also influence the visual field, while also having certain timeliness, one
As in 2 hours or so effect just become excessively poor；
Three, other schemes --- electrical heating, vibrations, hair dryer etc..The effect of this kind of scheme is also undesirable while implementing difficulty
Degree is higher, therefore nor rearview mirror removes rain best solution.
It defrosts this problem for automobile rearview mirror deicing, generally there is following several schemes at present：One, traditional side
Method --- it removes manually.This method is possible to not clean up, and clearance time is long, freezes hand etc., makes troubles to user；
Two, other schemes --- electrical heating, hair dryer etc..The effect of this kind of scheme is also undesirable while the more difficult acquisition of power supply, implementation are difficult
Degree is higher, therefore nor the best solution that rearview mirror deicing defrosts.
Currently, also have using ultrasonic wave except rain technology is applied on automobile rearview mirror, but current apparatus structure is main
There is following both sides defect：
First, the prior art is using the raindrop on ultrasonic wave vaporization rearview mirror, makes fog and be detached from minute surface, no
The ultrasonic energy only needed is higher, needs to expend a large amount of automobile storage battery electricity, and automobile is when sailing with the wind, fog
It is easily set on minute surface, is atomized so as to cause minute surface again, influence the observing effect of rearview mirror instead；
Second is that the prior art is configured with rain sensor on rearview mirror, or removed by manually controlling to manually start
Rain, the former can make the structure of whole device more complicated, and reliability reduces, and the latter can further increase the complexity of driving.
Invention content
Technical problem to be solved by the present invention lies in provide one kind to detect rear-vision mirror face in real time using ultrasonic wave
Situation simultaneously excites automatically, removes the method and device of sleet frost, and simple in structure, good reliability, power consumption are low.
The present invention is achieved by the following technical solutions：
A kind of automobile rearview mirror based on Lamb wave removes sleet frost method automatically, it is characterised in that：
Emit the detection Lamb wave from top to bottom propagated, the detection Lamb wave along minute surface on the upside of the minute surface of backsight eyeglass
Be by driving circuit tranmitting frequency be 980kHz~1023kHz, driving voltage be 20Vpp~80Vpp AC signal apply
On piezoelectric ceramic transducer patch, make piezoelectric ceramic transducer patch high frequency ultrasound vibrate and generate,
It is equal to or small when receiving the signal wave wave amplitude on the downside of the minute surface for traveling to backsight eyeglass that receives of feedback circuit
When setting the 60% of wave amplitude, receives feedback circuit and send feedback signal to driving circuit, the exchange letter of driving circuit transmitting
Number frequency range remains unchanged, and driving voltage is increased to 100Vpp~300Vpp, makes piezoelectric ceramic transducer patch high frequency ultrasound
Vibration generates and removes sleet frost Lamb wave along what backsight eyeglass minute surface was from top to bottom propagated,
Except sleet frost Lamb wave makes to generate acoustic streaming inside the raindrop being attached on backsight eyeglass minute surface, sound wave is in raindrop
The compressional wave of generation drives raindrop relative to the movement of backsight eyeglass minute surface occurs, to push raindrop to be detached from backsight eyeglass minute surface；
Alternatively, removing sleet frost Lamb wave along what the minute surface setting of backsight eyeglass was from top to bottom propagated, sleet frost is removed
It is 980kHz~1023kHz that Lamb wave, which is by driving circuit tranmitting frequency, and driving voltage is the exchange of 100Vpp~300Vpp
Signal is applied on piezoelectric ceramic transducer patch, make piezoelectric ceramic transducer patch high frequency ultrasound vibrate and generate,
Piezoelectric ceramic transducer patch generates heat, and makes on the minute surface of backsight eyeglass and the critical surface of accumulated snow, solidifying ice or frosting
It is liquid water that snow, ice or frost, which melt, meanwhile, except sleet frost Lamb wave makes to generate acoustic streaming inside liquid water, sound wave is in liquid water
The compressional wave of middle generation drives the snow floated on liquid water, ice or frost to move, to push snow, ice or frost to be detached from rearview mirror
The minute surface of piece.
When the setting wave amplitude is usually that no drop is attached to rearview mirror on piece, the propagation that feedback circuit receives is received
Signal wave wave amplitude on the downside of the minute surface of backsight eyeglass.
Further, the feedback signal be tranmitting frequency be 980kHz~1023kHz, output voltage be 100Vpp~
The AC signal of 300Vpp.
Since the principle of this method is to push raindrop, accumulated snow, solidifying ice or frosting to be detached from backsight eyeglass minute surface using Lamb wave,
Rather than vaporized to nebulize and be detached from backsight eyeglass minute surface, therefore for existing ultrasonic wave removes rain technology, need to expend
Automobile storage battery electricity it is less, piezoelectric ceramic transducer patch volume can be reached with smaller preferably remove sleet frost
Effect, and the hidden danger that minute surface coagulates mist is not had；In addition, surface conditions are monitored in real time by detecting Lamb wave, without additionally matching
Rain sensor is set, whole device is simpler reliable, and excites the AC signal voltage of detection Lamb wave very low, will not
Expend excessive automobile storage battery electricity.
It is a kind of to remove the automobile rearview mirror of sleet frost method automatically certainly using the above-mentioned automobile rearview mirror based on Lamb wave
Dynamic to remove sleet frost device, the automobile rearview mirror includes shell and backsight eyeglass, it is characterised in that：
It is organized in pairs at least a pair of upper piezoelectricity as Lamb wave transmitting terminal in the upper and lower both sides on the same surface of backsight eyeglass
Ceramic transducer patch and lower piezoelectric ceramic transducer patch as Lamb wave receiving terminal；
The driving circuit that configuration is powered by automobile storage battery in cavity between the backsight eyeglass and shell, the driving
Circuit includes Voltage stabilizing module, signal generator, Metal-Oxide Semiconductor field effect transistor M OSFET, transformer and wave amplitude
Control module；
Accumulator, Voltage stabilizing module, Metal-Oxide Semiconductor field effect transistor M OSFET, transformer, wave amplitude control mould
Block and upper piezoelectric ceramic transducer patch are sequentially electrically connected, and it is brilliant that signal generator is electrically connected Metal-Oxide Semiconductor field-effect
Body pipe MOSFET；
Configuration receives feedback circuit in cavity between the backsight eyeglass and shell, and the reception feedback circuit includes putting
Big circuit, filter circuit automatically control gain circuitry, sampling hold circuit and voltage comparator circuit；
Lower piezoelectric ceramic transducer patch automatically controls gain circuitry by amplifying circuit, filter circuit, and sampling keeps electricity
Road and voltage comparator circuit are electrically connected after being sequentially electrically connected between the access Voltage stabilizing module and accumulator.
Further, the automobile that the input voltage of the Metal-Oxide Semiconductor field-effect transistor is 12~18V stores
Battery DC voltage, input waveform are the output waveform of signal generator；Metal-Oxide Semiconductor field-effect transistor exports
Waveform is identical as input waveform, and maximum output voltage is 12~18V alternating voltages.
Piezoelectric ceramic transducer patch is directly bonded on backsight front lens surface (exposed face) or the back side both sides up and down, is driven
Dynamic circuit is fixed on inside back-mirror housing and is connect with upper piezoelectric ceramic transducer patch by electric wire.Whole system passes through vehicle
Body storage battery power supply, 12V~18V direct currents that Metal-Oxide Semiconductor field-effect transistor (MOSFET) provides accumulator
The signal of the various waveforms of voltage and signal generator is integrated, and output and the 980kHz of signal generator same waveform~
The AC signal of 1023kHz, 20Vpp~80Vpp or so, the AC signal are applied to the upper piezoelectric ceramics transducing on the upside of rearview mirror
On device patch, makes piezoelectric ceramics that high frequency ultrasound vibration occur, generate the detection Lamb wave transmitted along rearview mirror surface.Backsight
Lower piezoelectric ceramic transducer patch on the downside of mirror detects Lamb wave wave amplitude for real-time detection raindrop for monitoring in real time, when connecing
The signal wave wave amplitude that the lower piezoelectric ceramic transducer patch that feedback circuit receives is detected is received to be equal to or less than originally without liquid
(the particles such as raindrop when drop is attached to the 60% of the rearview mirror on piece signal wave wave amplitude that piezoelectric ceramic transducer patch is detected at present
Cause), it is equally fixed on inside back-mirror housing and is fed back by the reception that electric wire is connect with lower piezoelectric ceramic transducer patch
Circuit automatic trigger driving circuit makes it generate the AC signal of 980kHz~1023kHz, 100Vpp~300Vpp or so to swash
Piezoelectric ceramic transducer patch, which generates, on hair removes sleet frost Lamb wave, is encountered in transmission process when except sleet frost Lamb wave
When the particles such as raindrop, since the pattern of sound wave is converted, make to generate acoustic streaming inside raindrop, the compressional wave that sound wave generates in raindrop drives
Raindrop are made to fast move, to be detached from backsight eyeglass mirror mirror.When encountering the problem of deicing defrosts in winter, pass through
Vehicle body storage battery power supply, 12V~18V electricity that Metal-Oxide Semiconductor field-effect transistor (MOSFET) provides accumulator
Pressure is integrated with the signals of the various waveforms of signal generator, and the 980kHz of output and signal generator same waveform~
The AC signal of 1023kHz, 100Vpp~300Vpp or so, the AC signal are applied on piezoelectric ceramic transducer patch,
So that it is generated heat and high frequency ultrasound vibration occurs, is liquid water when the backsight lens surface and snow of frost critical part, ice or frost melt
When, since the pattern of sound wave is converted, so that liquid internal is generated acoustic streaming, the compressional wave that sound wave generates in liquid water drives snow, ice
Or frost fast moves, to be detached from the minute surface of backsight eyeglass.
Further, the output waveform of the signal generator is sine wave, cosine wave, square wave or triangular wave.
Further, the upper piezoelectric ceramic transducer patch and lower piezoelectric ceramic transducer patch are three pairs, single to paste
Plate shape size is the cuboid patch that length x width x thickness is 25mm × 1mm × 1mm, and patch is laterally covered on rearview mirror
On piece.
The beneficial effects of the present invention are：
1, this method and device are utilized except sleet frost Lamb wave pushes raindrop, accumulated snow, solidifying ice or frosting to be detached from rearview mirror
No matter piece minute surface does not have the phenomenon that minute surface coagulates mist and occurs, be inherently eliminated rainy day and winter rearview mirror mould against the wind with the wind
Security risk caused by paste；
2, relative to existing ultrasonic wave except for rain technology, this method and device except sleet frost principle need to expend
Automobile storage battery electricity is less, and piezoelectric ceramic transducer patch volume can reduce production and application cost with smaller；
3, whole device structure is simpler, and good reliability is compact-sized, small, without to existing when installation configures
Backsight eyeglass carries out destructive dismounting；
4, surface conditions are detected automatically by detecting Lamb wave, without additional configuration rain sensor, the blue nurse of excitation detection
The AC signal voltage of wave is very low, will not expend excessive automobile storage battery electricity, will not cause larger added burden.
Description of the drawings
Fig. 1 is a kind of piezoelectric ceramic transducer patch installation site stereoscopic schematic diagram of preferred structure of the present invention
Fig. 2 is circuit structure diagram
Fig. 3 is stress diagram of the raindrop in Fig. 1 devices
Fig. 4 is the vertical view of Fig. 3
The shift position schematic diagram of different time raindrop when Fig. 5 is except rain
Fig. 6 is the piezoelectric ceramic transducer patch installation site stereoscopic schematic diagram of another preferred structure of the present invention
Fig. 7 is stress diagram of the raindrop in Fig. 6 devices
Fig. 8 is the vertical view of Fig. 7
In Fig. 1~8：101 be upper piezoelectric ceramic transducer patch, and 201 be lower piezoelectric ceramic transducer patch, and 3 be backsight
Eyeglass, 4 fix disk for rearview mirror, and 5 adjust rotating disk for mirror body direction, and 6 be shell, and 7 be raindrop, and 8,9 and 10 be respectively raindrop
In the position of different time.
Specific implementation mode
The invention will be further described below in conjunction with the accompanying drawings.
As shown in Fig. 1, Fig. 6：Automobile rearview mirror includes back-mirror housing 6, backsight eyeglass 3, and speculum fixes disk 4 and mirror body
Direction adjusts rotating disk 5 etc., and rearview mirror is fixed disk 4 and connect with mirror body direction adjustment rotating disk 5, and mirror body direction adjusts rotating disk 5
It is fixed on back-mirror housing 6.It driving circuit and receives feedback circuit and has carried out Integration Design, occupied space is few, can be with
Design circlewise, be mounted on adjustment rotating disk 5 outer ring, on backsight eyeglass 3 upper piezoelectric ceramic transducer patch 101 and under
Piezoelectric ceramic transducer patch 201 is connected.
Embodiment 1
As shown in Figure 1, upper piezoelectric ceramic transducer patch 101 and lower piezoelectric ceramic transducer patch 201 are bonded respectively
In the both sides up and down of 3 minute surface of backsight eyeglass positive (exposed face), driving circuit is separately fixed at rearview mirror with feedback circuit is received
6 inside of shell is simultaneously connect with upper piezoelectric ceramic transducer patch 101, lower piezoelectric ceramic transducer patch 201 by electric wire respectively.
Whole device will be stored by vehicle body storage battery power supply, Metal-Oxide Semiconductor field-effect transistor (MOSFET)
The various waveforms (including sine wave, square wave, triangular wave etc.) for the 12V~18V DC voltages and signal generator that battery provides
Signal is integrated, and output is exchanged with 980kHz~1023kHz's of signal generator same waveform, 20Vpp~80Vpp or so
Signal, the AC signal are applied on piezoelectric ceramic transducer patch 101, bring it about high frequency ultrasound vibration, generate along
The detection Lamb wave that the minute surface of backsight eyeglass 3 is propagated.
Lower piezoelectric ceramic transducer patch 201 detects Lamb wave wave amplitude for real-time detection raindrop for monitoring in real time,
Instantly the signal wave wave amplitude that piezoelectric ceramic transducer patch 201 is detected is equal to or less than original no drop and is attached to rearview mirror
On piece at present piezoelectric ceramic transducer patch 201 receive detection signal wave wave amplitude 60% when (particles such as raindrop cause), connect
Receive feedback circuit automatic trigger driving circuit, generate 980kHz~1023kHz, 100Vpp~300Vpp or so AC signal with
Piezoelectric ceramic transducer patch 101 in excitation brings it about high frequency ultrasound vibration, generates along 3 specular transmission of backsight eyeglass
Except sleet frost Lamb wave.
As shown in figure 3, when encountering the particles such as raindrop 7 in transmission process except sleet frost Lamb wave, due to sound wave
Pattern is converted, and so that 7 inside of raindrop is generated acoustic streaming, the compressional wave that sound wave generates in drop drives raindrop 7 to move, works as driving
When voltage is sufficiently large, raindrop 7 can be driven to be detached from 3 minute surface of backsight eyeglass：Upper piezoelectric ceramic transducer patch 101 and lower piezoelectric pottery
201 paste position of porcelain energy converter patch and 7 stressing conditions of raindrop are as shown in Figure 3, Figure 4, and the true movement of raindrop 7 is such as Fig. 5 institutes
Show, it can be seen that except the position of sleet frost Lamb wave driving raindrop different moments：0 second position, 8,0.5 seconds positions 9 and 1 second
10 difference of position it is apparent, that is, have significantly remove rain effect.
Embodiment 2
Upper piezoelectric ceramic transducer patch 101 and lower piezoelectric ceramic transducer patch 201 are bonded in backsight eyeglass 3 respectively
The both sides up and down of positive (exposed face), driving circuit device are separately fixed at 6 inside of back-mirror housing simultaneously with feedback circuit is received
It is connect respectively with upper piezoelectric ceramic transducer patch 101 and lower piezoelectric ceramic transducer patch 201 by electric wire.
Whole device is by vehicle body storage battery power supply, and for automobile after long-time is stopped, northern cold snap is very possible
Can lead to 3 surface solidification of backsight eyeglass, one lamination snow, solidifying ice or frosting, car owner in warming up, can with the start-up by hand device, or
Pass through the connecting move control self-starting device when person's warming up.Metal-Oxide Semiconductor field-effect transistor (MOSFET) will
The letter of the various waveforms (including sine wave, square wave, triangular wave etc.) for the 12V~18V voltages and signal generator that accumulator provides
It number is integrated, exports and to be exchanged with 980kHz~1023kHz of signal generator same waveform, 100Vpp~300Vpp or so
Signal makes it generate heat and high frequency ultrasound vibration occurs, generate along backsight eyeglass to excite upper piezoelectric ceramic transducer patch 101
3 specular transmission removes sleet frost Lamb wave.It is liquid when the snow of rearview mirror surface and frost critical part, ice or frost melt
When, since the pattern of sound wave is converted, liquid internal is made to generate acoustic streaming, the compressional wave that sound wave generates in a liquid drives ice or frost hair
Life fast moves, and to be detached from automobile rearview mirror mirror mirror, can effectively achieve the purpose of deicing defrosting.
Embodiment 3
As shown in fig. 6, upper piezoelectric ceramic transducer patch 101 and lower piezoelectric ceramic transducer patch 201 are bonded respectively
Upper and lower sides at 3 back side of backsight eyeglass, driving circuit are separately fixed at 6 inside of back-mirror housing with reception feedback circuit and pass through
Electric wire is connect with upper piezoelectric ceramic transducer patch 101, lower piezoelectric ceramic transducer patch 201 respectively.
Whole device will be stored by vehicle body storage battery power supply, Metal-Oxide Semiconductor field-effect transistor (MOSFET)
The letter of the various waveforms (including sine wave, square wave, triangular wave etc.) for the 12~18V DC voltages and signal generator that battery provides
It number is integrated, exports and to exchange letter with 980kHz~1023kHz of signal generator same waveform, 20Vpp~80Vpp or so
Number, which is applied on piezoelectric ceramic transducer patch 101, brings it about high frequency ultrasound vibration, generates along anti-
Penetrate the detection Lamb wave of mirror surface transmission.Lower piezoelectric ceramic transducer patch 201 in real time monitor detect Lamb wave wave amplitude with
For real-time detection raindrop, piezoelectric ceramic transducer patch 201 is detected instantly signal wave wave amplitude is equal to or less than not to be had originally
When thering is drop to be attached to the 60% of the signal wave wave amplitude of the rearview mirror on piece detection of the reception of piezoelectric ceramic transducer patch 201 at present
(particles such as raindrop cause), reception feedback circuit automatic trigger driving circuit, generation 980kHz~1023kHz, 100Vpp~
The AC signal of 300Vpp or so brings it about high frequency ultrasound vibration, generates edge to excite upper piezoelectric ceramic transducer patch 101
Can effectively existing due to the effect of Lamb wave guided wave except sleet frost Lamb wave for 3 inner surface of backsight eyeglass transmission
What generation was in the same direction on the outer surface of backsight eyeglass 3 removes sleet frost Lamb wave.When except sleet frost Lamb wave is in transmission process
When encountering the particles such as raindrop 7, since the pattern of sound wave is converted, 7 inside of raindrop is made to generate acoustic streaming, the pressure that sound wave generates in drop
Contracting wave drives raindrop 7 to move, to be detached from automobile rearview mirror mirror mirror.Upper piezoelectric ceramic transducer patch 101, under
Shown in 202 paste position of piezoelectric ceramic transducer patch and 7 stressing conditions of raindrop such as Fig. 6, Fig. 7 and Fig. 8, can effectively it reach
To the automatic purpose for removing rain.
Embodiment 4
Upper piezoelectric ceramic transducer patch 101 and lower piezoelectric ceramic transducer patch 201 are bonded in backsight eyeglass 3 respectively
The upper and lower sides at the minute surface back side, driving circuit are separately fixed at 6 inside of back-mirror housing and by electric wire point with feedback circuit is received
It is not connect with upper piezoelectric ceramic transducer patch 101, lower piezoelectric ceramic transducer patch 201.
Whole device is by vehicle body storage battery power supply, and for automobile after long-time is stopped, northern cold snap is very possible
Can lead to 3 surface solidification of backsight eyeglass, one lamination snow, solidifying ice or frosting, car owner in warming up, can with the start-up by hand device, or
Pass through the connecting move control self-starting device when person's warming up.Metal-Oxide Semiconductor field-effect transistor (MOSFET) will
The letter of the various waveforms (including sine wave, square wave, triangular wave etc.) for the 12V~18V voltages and signal generator that accumulator provides
It number is integrated, exports and to be exchanged with 980kHz~1023kHz of signal generator same waveform, 100Vpp~300Vpp or so
Signal makes piezoelectric ceramics that high frequency ultrasound vibration occur, generates along speculum table to excite upper piezoelectric ceramic transducer patch 101
Face transmission removes sleet frost Lamb wave.When the heat that upper piezoelectric ceramic transducer patch 101 is distributed makes backsight eyeglass 3
When surface thawing opposite with frost critical part is liquid, since the pattern of sound wave is converted, liquid internal is set to generate acoustic streaming, sound wave exists
The compressional wave generated in liquid drives ice or frost to fast move, to be detached from automobile rearview mirror mirror mirror.Can have
Effect ground achievees the purpose that deicing defrosts.
In conclusion the present invention is that piezoelectric ceramic transducer patch is directly bonded on 3 front of backsight eyeglass or the back side
Both sides up and down, obtain 980kHz~1023kHz using driving circuit, the AC signal of 20Vpp~80Vpp or so is applied to
On piezoelectric ceramic transducer patch 101, lower piezoelectric ceramic transducer patch 201 be used for real-time detection raindrop, when there is raindrop with
The AC signal for triggering 980kHz~1023kHz, 100Vpp~300Vpp or so is applied on driving circuit, and piezoelectricity is made to make pottery
High frequency ultrasound vibration occurs for porcelain energy converter patch 101, generates and removes sleet frost Lamb wave, and profit along what mirror surface was transmitted
Drop is pushed with the Lamb wave of generation, reaches the target of cleaning minute surface；When the winter of cold, driving circuit is used to obtain 980kHz
The AC signal of~1023kHz, 100Vpp~300Vpp or so is applied on piezoelectric ceramic transducer patch 101, makes pressure
Electroceramics energy converter patch 101 generates heat and high frequency ultrasound vibration occurs, and generates and removes sleet frost along what mirror surface was transmitted
Lamb wave, when the heat that upper piezoelectric ceramic transducer patch 101 is distributed makes rearview mirror surface is opposite with frost critical part to melt
When turning to liquid, the compressional wave that sound wave generates in a liquid drives ice or frost to fast move, to utilize the blue nurse generated
Wave pushes frost to be detached from minute surface, achievees the purpose that deicing defrosts.
Claims (6)
1. a kind of automobile rearview mirror based on Lamb wave removes sleet frost method automatically, it is characterised in that：
Emit the detection Lamb wave from top to bottom propagated, the detection Lamb wave along minute surface on the upside of the minute surface of backsight eyeglass (3)
Be by driving circuit tranmitting frequency be 980kHz~1023kHz, driving voltage be 20Vpp~80Vpp AC signal apply
It is being bonded on the upside of 3 back side of backsight eyeglass on piezoelectric ceramic transducer patch, piezoelectric ceramic transducer patch high frequency ultrasound is made to shake
It is dynamic and generation,
When the signal wave wave amplitude received on the downside of the minute surface for traveling to backsight eyeglass (3) that feedback circuit receives is equal to or less than
When setting the 60% of wave amplitude, receives feedback circuit and send feedback signal to driving circuit, the AC signal of driving circuit transmitting
Frequency range remains unchanged, and driving voltage is increased to 100Vpp~300Vpp, and piezoelectric ceramic transducer patch high frequency ultrasound is made to shake
It is dynamic, it generates and removes sleet frost Lamb wave along what backsight eyeglass (3) minute surface was from top to bottom propagated,
Except sleet frost Lamb wave makes to generate acoustic streaming inside the raindrop being attached on backsight eyeglass (3) minute surface, sound wave is in raindrop
The compressional wave of generation drives raindrop relative to the movement of backsight eyeglass (3) minute surface occurs, to push raindrop to be detached from backsight eyeglass (3) mirror
Face；
Alternatively, sleet frost Lamb wave is removed along what the minute surface setting of backsight eyeglass (3) was from top to bottom propagated, except sleet frost is blue
It is 980kHz~1023kHz that nurse wave, which is by driving circuit tranmitting frequency, and the exchange that driving voltage is 100Vpp~300Vpp is believed
It number is applied to and to be bonded on the upside of 3 back side of backsight eyeglass on piezoelectric ceramic transducer patch, make piezoelectric ceramic transducer patch high frequency
Ultrasonic vibration and generate,
Piezoelectric ceramic transducer patch generates heat, and makes on the minute surface of backsight eyeglass (3) and the critical surface of accumulated snow, solidifying ice or frosting
It is liquid water that snow, ice or frost, which melt, meanwhile, except sleet frost Lamb wave makes to generate acoustic streaming inside liquid water, sound wave is in liquid water
The compressional wave of middle generation drives the snow floated on liquid water, ice or frost to move, to push snow, ice or frost to be detached from rearview mirror
The minute surface of piece (3).
2. the automobile rearview mirror according to claim 1 based on Lamb wave removes sleet frost method automatically, it is characterised in that：
The feedback signal is the AC signal that tranmitting frequency is 980kHz~1023kHz, output voltage is 100Vpp~300Vpp.
3. after a kind of automobile removing sleet frost method automatically using the automobile rearview mirror described in claim 1 based on Lamb wave
Visor removes sleet frost device automatically, and the automobile rearview mirror includes shell (6) and backsight eyeglass (3), it is characterised in that：
It is organized in pairs at least a pair of upper piezoelectric ceramics as Lamb wave transmitting terminal in the upper and lower both sides at backsight eyeglass (3) back side
Energy converter patch (101) and lower piezoelectric ceramic transducer patch (201) as Lamb wave receiving terminal；
The driving circuit that configuration is powered by automobile storage battery in cavity between the backsight eyeglass (3) and shell (6), the drive
Dynamic circuit includes Voltage stabilizing module, signal generator, Metal-Oxide Semiconductor field effect transistor M OSFET, transformer and wave
Width control module；
Accumulator, Voltage stabilizing module, Metal-Oxide Semiconductor field effect transistor M OSFET, transformer, wave amplitude control module and
Upper piezoelectric ceramic transducer patch (101) is sequentially electrically connected, and it is brilliant that signal generator is electrically connected Metal-Oxide Semiconductor field-effect
Body pipe MOSFET；
Configuration receives feedback circuit in cavity between the backsight eyeglass (3) and shell (6), and the reception feedback circuit includes
Amplifying circuit, filter circuit automatically control gain circuitry, sampling hold circuit and voltage comparator circuit；
Lower piezoelectric ceramic transducer patch (201) automatically controls gain circuitry by amplifying circuit, filter circuit, and sampling is kept
Circuit and voltage comparator circuit are electrically connected after being sequentially electrically connected between the access Voltage stabilizing module and accumulator；
Driving circuit tranmitting frequency is 980kHz~1023kHz, and driving voltage is that the AC signal of 20Vpp~80Vpp is applied to
It is bonded on the upper piezoelectric ceramic transducer patch (101) on the upside of backsight eyeglass (3) back side；Instantly piezoelectric ceramic transducer patch
(201) the signal wave wave amplitude detected is equal to or less than original no drop and is attached to rearview mirror on piece piezoelectric ceramics transducing at present
When device patch (201) receives the 60% of the signal wave wave amplitude of detection, feedback circuit automatic trigger driving circuit is received, is generated
980kHz~1023kHz, 100Vpp~300Vpp AC signal to excite upper piezoelectric ceramic transducer patch (101), make
Piezoelectric ceramic transducer patch (101) high frequency ultrasound is vibrated, and is generated and is removed rain along what backsight eyeglass (3) minute surface was from top to bottom propagated
Snow ice frost Lamb wave；
Alternatively, driving circuit tranmitting frequency is 980kHz~1023kHz, the exchange that driving voltage is 100Vpp~300Vpp is believed
Number, it is applied on the upper piezoelectric ceramic transducer patch (101) being bonded on the upside of 3 back side of backsight eyeglass, piezoelectric ceramics is made to change
High frequency ultrasound vibration occurs for energy device patch (101), generates and removes sleet frost Lamb wave along what mirror surface was transmitted.
4. automobile rearview mirror according to claim 3 removes sleet frost device automatically, it is characterised in that：The signal occurs
The output waveform of device is sine wave, cosine wave, square wave or triangular wave.
5. automobile rearview mirror according to claim 3 removes sleet frost device automatically, it is characterised in that：The metal-oxygen
The input voltage of compound semiconductor field effect transistor is the automobile storage battery DC voltage of 12~18V, and input waveform is signal
The output waveform of generator；Metal-Oxide Semiconductor field-effect transistor output waveform is identical as input waveform, maximum output
Voltage is 12~18V alternating voltages.
6. automobile rearview mirror according to claim 3 removes sleet frost device automatically, it is characterised in that：The upper piezoelectricity pottery
Porcelain energy converter patch (101) and lower piezoelectric ceramic transducer patch (201) are three pairs, and single patch shape size is length × wide
Degree × thickness is the cuboid patch of 25mm × 1mm × 1mm, and patch is laterally covered on automotive rear-view eyeglass (3).
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| CN201610625479.7A CN106080526B (en) | 2016-08-02 | 2016-08-02 | A kind of automobile rearview mirror based on Lamb wave removes sleet frost method and device automatically |
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| CN101219658A (en) * | 2008-01-25 | 2008-07-16 | 刘建芳 | Piezo-electricity driven automatically raindrop removing automobile rear view mirror |
| CN102923098A (en) * | 2012-11-25 | 2013-02-13 | 陈科 | Automobile rearview mirror capable of eliminating rainwater and fog |
| CN105408033A (en) * | 2013-07-22 | 2016-03-16 | 艾克维斯塔股份有限公司 | An apparatus and method for clearing water from a window |
| CN205916086U (en) * | 2016-08-02 | 2017-02-01 | 上海工程技术大学 | Automatic sleet moral integrity device that removes of automobile rearview mirror based on lamb wave |
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| JPH072062A (en) * | 1993-06-14 | 1995-01-06 | Mitsubishi Motors Corp | Rearview mirror |
| GB201100290D0 (en) * | 2011-01-10 | 2011-02-23 | Trevett David R M | Clearing precipitation from windaows |
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|---|---|---|---|---|
| CN101219658A (en) * | 2008-01-25 | 2008-07-16 | 刘建芳 | Piezo-electricity driven automatically raindrop removing automobile rear view mirror |
| CN102923098A (en) * | 2012-11-25 | 2013-02-13 | 陈科 | Automobile rearview mirror capable of eliminating rainwater and fog |
| CN105408033A (en) * | 2013-07-22 | 2016-03-16 | 艾克维斯塔股份有限公司 | An apparatus and method for clearing water from a window |
| CN205916086U (en) * | 2016-08-02 | 2017-02-01 | 上海工程技术大学 | Automatic sleet moral integrity device that removes of automobile rearview mirror based on lamb wave |
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