CN2922285Y - Planar condenser sensor - Google Patents
Planar condenser sensor Download PDFInfo
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- CN2922285Y CN2922285Y CN 200620118051 CN200620118051U CN2922285Y CN 2922285 Y CN2922285 Y CN 2922285Y CN 200620118051 CN200620118051 CN 200620118051 CN 200620118051 U CN200620118051 U CN 200620118051U CN 2922285 Y CN2922285 Y CN 2922285Y
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Abstract
A planar condenser sensor comprises a planar capacitance, a planar capacitance compensator for eliminating interference signal and a sensor testing circuit. The utility model adopts a double planar capacitance, wherein, one planar capacitance is as a measuring capacitance, while the other one is as a compensation capacitance. The installation position and shapes of the compensation capacitance are changed to be insensitive to the rainwater on the surface of the glass and sensitive to the temperature floating and electro-magnetic interference. When temperature floating and electro-magnetic interference occurs, the measured values of the measuring capacitance and the compensation capacitance change simultaneously with same extent. The measuring capacitance value will change with change of the rainwater, while the compensation capacitance remains constant, which can be used to compensate of difference to the sensor measured value, thereby effectively reducing the unfavorable affection of temperature floating and electro-magnetic interference to the sensor measuring sensitivity and avoiding wrong action due to rain.
Description
Technical field:
The utility model relates to a kind of device that detects the windshield environmental change, especially relates to detecting the checkout gear that the windshield rainfall changes.
Background technology:
Entered since 21 century, automotive electronicsization and intelligent direction and the forward position that has become the auto industry technical development, the fail safe of automobile and hommization also become the focus that each big automobile vendor pays attention to.Automatic checkout system is not only the concern with humanization that is conceived to conveniently driving, and the more important thing is that automatic checkout system is the important component part of automobile active safety system.Under the big environment of rainy day or relative air humidity, usually can influence driver's sight line on the windshield surface because of rainwater is excessive.
The key technology of automatic Wiper system of the prior art is the Raindrop sensor technology, to be objective, by the end of today, worldwide Raindrop sensor technology is still very unripe, although automobile vendor that some are famous such as germany volkswagen, U.S.'s Chrysler, french citroen etc. successfully have been equipped with automatic Wiper system on their automobile product, because Raindrop sensor technology immature caused sorry that installation difficulty is big, cost is high, the misoperation rate is higher.
In order to solve the problems that Raindrop sensor exists in the prior art, the applicant was on September 19th, 2003, applied for the ZL03160008.5 patent of invention, name is called a kind of flat capacitance type intelligence Wiper system transducer automatically, comprise: one is installed in the lip-deep planar capacitor of shield glass, with the senser as transducer, two pole plates of wherein said planar capacitor are placed at grade; A sensor detection circuit detects the affected by environment and electric capacitance change brought of described planar capacitor, and produces the control signal of control rain brush work according to the electric capacitance change that is detected.This scheme can be installed transducer the inner surface of shield glass, and is positioned at the moving scope of rain brush brush, thus provide a kind of cost low, simple Raindrop sensor is installed.But this scheme does not solve temperature floats the problem that impacts for the accuracy of detection of transducer with electromagnetic interference.At first, two electrodes of planar capacitor directly are attached on the windshield glass of automobile inner surface, because changing, the speed of a motor vehicle causes the windshield glass variations in temperature greatly, and temperature directly influences the change in dielectric constant of glass, cause the temperature drift of measuring-signal, consequence is to make to measure the sensitivity instability, even causes the windscreen wiper misoperation; Secondly, be attached to the reception antenna of the planar capacitor formation wireless electromagnetic signal on the windshield glass of automobile inner surface, can't shield again, when running into wireless electromagnetic interference by force, possible windscreen wiper causes misoperation.
The utility model content:
Technical problem to be solved in the utility model is to overcome the deficiency of above-mentioned prior art, provide a kind of temperature of can eliminating to float plane capacitance sensor with electromagnetic interference, this apparatus structure is simple, and can overcome simultaneously that the measured area that existing photoelectric type and flat capacitance type checkout gear exist is little, energy measurement rainwater thickness, vulnerable to pollution thing disturb, installation requirement is too high, deficiency such as bad adaptability and cost are higher.
A kind of plane capacitance sensor that provides according to the utility model, comprise that one is installed in the planar capacitor and a sensor detection circuit that is connected with described planar capacitor on the shield glass, described planar capacitor is as the senser of transducer, two pole plates of wherein said planar capacitor are placed at grade, described sensor detection circuit detects the affected by environment and electric capacitance change brought of described planar capacitor, and produce the control signal of control rain brush equipment work according to the electric capacitance change that detected, it is characterized in that: described sensor detection circuit also is connected with the plane capacitance compensator of an elimination interference signal, two pole plate is placed at grade, described plane capacitance compensator is only as the senser that detects interference signal, described sensor detection circuit detects the electric capacitance change that described plane capacitance compensator is influenced by interference signal to bring, and compensates the described planar capacitor electric capacitance change of bringing affected by environment according to the electric capacitance change that is detected.
A kind of plane capacitance sensor that provides according to the utility model also has following attached technical characterictic:
A kind of embodiment that the utility model provides, described plane capacitance compensator and described planar capacitor front and back on windshield be arranged in parallel.
Described plane capacitance compensator is identical with shape, size, the static capacitance value of described planar capacitor.
Described planar capacitor is positioned at the interlayer of windshield, and described plane capacitance compensator is positioned at the inner surface of the windshield relative with described planar capacitor position.
Described planar capacitor is close to the inner surface of windshield, and described plane capacitance compensator is positioned at the back of described planar capacitor, and by forming a determining deviation between an insulation material layer and the described planar capacitor.
The another embodiment that the utility model provides is that described plane capacitance compensator and described planar capacitor are installed at grade.
Described plane capacitance compensator and described planar capacitor are installed on the inner surface of windshield.
Described plane capacitance compensator is positioned at described planar capacitor or near the side of described planar capacitor.
Shared one of them pole plate of described capacitive compensator and described planar capacitor.
The gross area of the two-plate of described plane capacitance compensator is less than the gross area of the two-plate of described planar capacitor, and the spacing between the two-plate of described plane capacitance compensator is less than the thickness of its position glass, and the spacing between the two-plate of described planar capacitor is equal to or greater than the thickness of its position glass.
The two-plate of described planar capacitor and described plane capacitance compensator is shaped as rectangle, annular, fan-shaped, triangle or polygon.The gross area of the two-plate of described planar capacitor is the 10-20 square centimeter, and the gross area of the two-plate of described plane capacitance compensator is the 5-11 square centimeter.
A kind of embodiment of the sensor detection circuit that the utility model provides is, described sensor detection circuit comprises signal generator, program control analog signal is amplified and filter circuit, difference channel, analog to digital conversion circuit, microprocessor, described signal generator produces the test signal of an access planar capacitor and plane capacitive compensator, when described test signal is flowed through described planar capacitor and described plane capacitance compensator, be affected by the external environment and change, test signal after two variations is imported described program control analog signal respectively and is amplified and filter circuit, amplify with filtering after, produce two d. c. voltage signals, two described d. c. voltage signals are after described difference channel carries out difference processing, produce a differential signal, described differential signal converts digital signal to via analog-digital conversion circuit as described, described microprocessor receives described digital signal, described digital signal is handled, formed the transducer digital output signal of control appliance work.
Another embodiment of the sensor detection circuit that the utility model provides is, described sensor detection circuit comprises signal generator, program control analog signal is amplified and filter circuit, analog to digital conversion circuit, microprocessor, described signal generator produces the test signal of an access planar capacitor and plane capacitive compensator, when described test signal is flowed through described planar capacitor and described plane capacitance compensator, be affected by the external environment and change, test signal after two variations is imported described program control analog signal respectively and is amplified and filter circuit, amplify with filtering after, produce two d. c. voltage signals, two described d. c. voltage signals convert two digital signals to via analog-digital conversion circuit as described respectively, described microprocessor receives two described digital signals, two described digital signals are carried out calculus of differences, and form the transducer digital output signal of control appliance work according to the result of calculus of differences.
Described planar capacitor is installed in the zone of windshield wiper work, and in equipment work, this device continues glass surface is detected and form feedback signal, and further control appliance work constitutes closed-loop control system.
The plane capacitance sensor that provides according to the utility model has following advantage with respect to prior art: the utility model adopts biplane electric capacity, one of them plane capacitance is as measuring electric capacity, another is electric capacity by way of compensation, make its rainwater insensitive by installation site and the shape that changes building-out capacitor, and temperature is floated and the electromagnetic interference sensitivity glass outer surface.When meeting that temperature is floated or during electromagnetic interference, the measured value of measuring electric capacity and building-out capacitor takes place to change simultaneously and the amplitude of variation approximately equal simultaneously, measure capacitance when rainwater changes and change thereupon when meeting, and the building-out capacitor value remains unchanged substantially.Utilize above characteristic to carry out the difference compensation, reduce temperature effectively and float and the electromagnetic interference adverse effect that sensitivity brings to sensor measurement, avoid the windscreen wiper misoperation measurement value sensor.
Description of drawings:
Fig. 1 is point charge electric field line distribution figure;
Fig. 2 is a parallel plate type capacitive field line distribution map;
Fig. 3 is the planar capacitor electric field line distribution figure of 2 rectangle pole plates of the utility model;
Fig. 4 is the measurement space schematic diagram that the planar capacitor of 2 rectangle pole plates of the utility model forms;
Fig. 5 is the utility model equivalent capacity measurement model figure;
Fig. 6 is the cross-sectional schematic of a kind of embodiment of the utility model, is arranged at the interlayer of windshield and the schematic diagram of inner surface before and after planar capacitor shown in the figure and the plane capacitive compensator, and the measurement space that both form is shown among the figure simultaneously.
Fig. 7 is the cross-sectional schematic of the another kind of embodiment of the utility model, is arranged at the schematic diagram of the inner surface of windshield before and after planar capacitor shown in the figure and the plane capacitive compensator, and the measurement space that both form is shown among the figure simultaneously.
Fig. 8 is that the pole plate of the utility model midplane capacitor and plane capacitive compensator is the schematic diagram of rectangle.
Fig. 9 is the schematic diagram of the pole plate of the utility model midplane capacitor and plane capacitive compensator for annular.
Figure 10 is the utility model midplane capacitor and plane capacitive compensator setting schematic diagram at grade.
Figure 11 is that the pole plate of the utility model midplane capacitor and plane capacitive compensator is the schematic diagram of rectangle and shared one of them pole plate.
Figure 12 is the schematic diagram of the pole plate of the utility model midplane capacitor and plane capacitive compensator for annular and shared one of them pole plate.
Figure 13 is the profile of the utility model mounting structure.
Figure 14 is the block diagram of a kind of embodiment of the utility model plane capacitance testing circuit.
Figure 15 is the block diagram of the another kind of embodiment of the utility model plane capacitance testing circuit.
Provide embodiment below in conjunction with accompanying drawing, invention be elaborated:
Embodiment:
Before describing the utility model in detail, sketch prior art and operation principle of the present utility model earlier:
Traditional capacitance type sensor is based on parallel plate type electric capacity, and its principle is: if do not consider the edge effect of inhomogeneous field, and the electric capacity that two parallel-plates are formed, its capacitance is
C＝ε·S/d
In the formula, ε is the dielectric constant of medium between pole plate, and ε=ε 0 ε r, ε 0 are the dielectric constant in the vacuum, ε 0=8.85410
-12F/m, ε r are the dielectric constants of medium relative vacuum, the relative dielectric constant ε r ≈ 1 of air, other medium ε r＞1; S is the area of pole plate; D is the spacing of pole plate.
Because the variation of measured medium causes that capacitance type sensor has related parameter ε, S, the variation of d changes capacitance C thereupon.In view of the above, traditional capacitance type sensor can be divided into three types with the variation of different parameters: become space type (parameter d variation); Variable area formula (parameter S variation); Become dielectric constant formula (parameter ε variation).
The planar capacitor that the utility model proposes has been broken the thinking set of traditional capacitance type sensor based on the parallel plate type capacitance principle from principle, and it is pressed certain interval with two pole plates of capacitor and places at grade, rather than parallel placement.It does not belong to any of above-mentioned three kinds of conventional condenser sensor types, and it is a kind of comprehensive capacitance type sensor, and it has the characteristic that becomes space type, variable area formula and become dielectric constant formula capacitance sensor simultaneously.
Capacitive measuring principle of the present utility model is as follows:
According to the vector superposed principle of the field intensity of electric field theory, we know that the characteristic of capacitor can be described with electric field line distribution, referring to Fig. 1 and Fig. 2, provide the electric field line distribution of point charge and parallel plate capacitor respectively, among the figure, and the 10th, electric field line, 28 and 29 is point charges.Be convenient following discussion, Fig. 3 provides the electric field line distribution of semicircle planar capacitor.By among Fig. 2 as can be seen, the electric field line 10 of parallel plate capacitor mainly is distributed in the coffin between two parallel-plates, therefore when calculating the capacitance of parallel plate capacitor, the influence that can ignore the parallel-plate fringe field draws the capacitance computing formula of parallel plate capacitor: C=ε S/d.In like manner, as seen from Figure 3, the electric field line of planar capacitor mainly is distributed in the approximate ellipsoidal spheroid space of two plane electrode panel areas, because the Theoretical Calculation of plane capacitance is too complicated, does not go through herein.
Referring to Fig. 3 and Fig. 4, there is shown the electric field line spatial distribution of the planar capacitor under the applied environment that the utility model relates to, two plane electrode plates 11,12 are close to below the glass 9, by the distribution shape of the electric field line among Fig. 3 and Fig. 4 10 as can be seen, owing to be subjected to the different medium influence, two plane electrode plates 11 can be divided into three different spaces with battery lead plate 12 approximate ellipsoidal spheroid space on every side: vehicle glass 9 inner surfaces and the plane electrode plate 11 and the approximate half elliptic spheroid space N1 of battery lead plate below 12 that are close on the inner surface; The flat elliptic space N2 that more than 12 and vehicle glass 9 inside of plane electrode plate 11 and battery lead plate comprise; Near the half elliptic space Nx that forms vehicle glass 9 outer surfaces.Because the medium of approximate half elliptic spheroid space N1 and flat elliptic space N2 is respectively uniform air and glass, its dielectric constant and volume can be thought constant.And half elliptic space Nx is air usually, and when other foreign matters enter, bigger variation will take place for its dielectric constant and volume, and half elliptic space Nx is our measurement space just.
Based on above discussion, referring to Fig. 5, the equivalent capacity model that the utility model proposes.Wherein, equivalent capacity C3 in parallel is the constant electric capacity of being determined by half approximate ellipsoidal spheroid space N1 and flat elliptic space N2, series capacitance C1 and C2 are by passing through the vehicle glass outer surface more than the plane electrode but are enclosed in the constant electric capacity of vehicle glass outer surface with interior space decision that Cx is the variable capacitance that half elliptic space Nx forms.The capacitance of Cx depends on the dielectric constant of the foreign matter that enters half elliptic space Nx, the area that foreign matter covers, the thickness that foreign matter forms at half elliptic space Nx simultaneously, and this thickness can be equal to the spacing of plane-parallel capacitor in theory.
By above discussion to the utility model principle, we can obtain following 2 conclusions:
The capacitance type sensor of any type that the planar capacitor that 1, the utility model proposes is different from the past, comprise: variable area, change spacing type and change dielectric constant type, it is comprehensive capacitance type sensor, the variation of its area of perception simultaneously, spacing and three parameters of dielectric constant.
2, the planar capacitor that the utility model proposes not only can be distinguished the foreign matter of vehicle glass near surface, and perception simultaneously covers transducer area and the thickness that the glass surface foreign matter covers of getting on the car, and this existing just electro-optical pickoff can't be accomplished.
After having set forth inventive principle of the present utility model, provide the plane capacitance sensor that utilizes above-mentioned principle to produce below.
Referring to Fig. 6 and Fig. 8, as a kind of preferred embodiment of the present utility model, adopt one side to have the copper foil tape of adhesive sticker, being processed into width is a=2cm, length is 2 rectangular electrode plates 11,12 of b=4cm, the gross area of described battery lead plate 11,12 is 16 square centimeters, and the gap between the two-plate is 0.6cm.On the inner surface of the windshield glass of automobile 9 that described battery lead plate 11,12 sticks on, be positioned at the position that automobile rearview mirror 19 back do not influence pilot's line of vision and are in the moving scope of rain brush brush.Form two electrodes of planar capacitor 1 thus.Be installed in the purpose that can realize non-contact measurement on the inner surface of windshield 9.Simultaneously, the installation site of described planar capacitor 1 belongs to rain brush blows in the working range of rain, and not only whether rainy existence detects to glass surface, and the effect of rain brush work is detected.The spacing of described pole plate 11,12 is greater than the thickness of glass of its position.The magnetic field of its formation just has outside most outer surface that is positioned at glass like this, forms to measure the semiellipse magnetic field space Nx that rainwater is used.
Referring to Fig. 7 and Fig. 8, in the foregoing description that provides according to the utility model, in order to eliminate the influence of temperature and electromagnetism to planar capacitor 1, the utility model is arranged with plane capacitance compensator 2 in parallel in the back of described planar capacitor 1, two pole plates of described plane capacitance compensator 2 and two pole plates of described planar capacitor 1 are identical, and its spacing also is the same.Finally make described plane capacitance compensator 2 identical with shape, size, the static capacitance value of described planar capacitor 1.In order to make described plane capacitance compensator 2 not to the rainwater sensitivity, an insulation material layer 4 is set between planar capacitor 1 and plane capacitive compensator 2, form a determining deviation.Thereby the magnetic field space that plane capacitance compensator 2 is formed is no more than the outer surface of shield glass, does not promptly have and measures the magnetic field space Nx that rainwater is used.
Referring to Fig. 6, the scheme that described planar capacitor 1 that the utility model provides and described plane capacitance compensator 2 front and back be arranged in parallel, when mounted, also described planar capacitor 1 can be installed in the interlayer of shield glass 9, described plane capacitance compensator 2 is positioned at the inner surface of the shield glass 9 relative with described planar capacitor 1 position.But the magnetic field that will guarantee described plane capacitance compensator 2 equally all is positioned at below the outer surface of glass, does not promptly have to measure the magnetic field space Nx that rainwater is used.
Referring to Figure 10 and Figure 11, in the another kind of preferred embodiment that the utility model provides, described plane capacitance compensator 2 is installed on the same plane of shield glass 9 with described planar capacitor 1.And all be positioned on the inner surface of shield glass 9.A pole plate 21 of described plane capacitance compensator 2 is shared with one of them pole plate 12 of described planar capacitor 1, another pole plate 22 of described plane capacitance compensator 2 is positioned at a side of described shared pole plate, its width is 0.2cm, and length is 4cm, with the gap of shared pole plate 12 be 0.1cm.The gross area of the two-plate of described plane capacitance compensator 2 is 8.8 square centimeters.The gross area of the two-plate of described plane capacitance compensator 2 is less than the gross area (16 square centimeters) of the two-plate of described planar capacitor 1, and the spacing between the two-plate of described plane capacitance compensator 2 is far smaller than the thickness of its position glass 9.The magnetic field that guarantees described plane capacitance compensator 2 so all is positioned at below the outer surface of glass 9, does not promptly have to measure the magnetic field space Nx that rainwater is used.
Referring to Figure 12, what the utility model provided is arranged on described planar capacitor 1 and described plane capacitance compensator 2 in the conplane scheme, also described plane capacitance compensator 2 can be arranged on described planar capacitor 1 inside.In another scheme that provides as the utility model, in two pole plates of described planar capacitor 1, one is ring plate 11, and a circular pole plate 12 is set in ring plate 11.One less circular pole plate 22 is set in the circular pole plate 12 of described planar capacitor 1 again, makes big circular pole plate 12 become shared pole plate, thereby constitute described plane capacitance compensator 2.The spacing of small circular pole plate 22 and big circular pole plate 12 is far smaller than the thickness of its place glass, thus, guarantees that the magnetic field of described plane capacitance compensator 2 all is positioned at below the outer surface of glass, does not promptly have to measure the magnetic field space Nx that rainwater is used.
In the above-mentioned various embodiments that the utility model provides, no matter be which kind of embodiment, final purpose all is that the magnetic field that guarantees described plane capacitance compensator 2 all is positioned at below the outer surface of glass 9, does not promptly have and measures the magnetic field space Nx that rainwater is used.Only in this way just can make 2 pairs of rainwater of described plane capacitance compensator insensitive,, become the senser that only detects interference signal only to temperature and electromagnetic interference signal sensitivity.
Referring to Figure 13, in the embodiment that the utility model provides, the pole plate of described planar capacitor 1 and described plane capacitance compensator 2 is connected to sensor detection circuit 3 with shielded conductor 14 respectively.For preventing that the people from being accidental damage; conical plastic protective cover 24 on the rear mask of described planar capacitor 1 and described plane capacitance compensator 2; conical plastic protective cover 24 cements on the inner surface of windshield glass of automobile 9; be guard shield lead 14; shielded conductor 14 is drawn out in the interlayer of roof hood 17 and roof interior trim 16 at conical plastic protective cover 24 upper sides by plastic bushing 13; two shielded conductors 14 are connected electrically on the circuit board 15 that is installed in roof hood 17 and roof interior trim 16 interlayers; circuit board 15 carries out electromagnetic shielding and protection by the plastic casing 23 that has screen, and the digital output signal of transducer is sent to the control unit of automatic Wiper system by shielding LIN bus cable 18.
Referring to Figure 14, in the foregoing description that the utility model provides, described sensor detection circuit 3 comprises signal generator 31, program control analog signal is amplified and filter circuit 32, difference channel 33, analog to digital conversion circuit 34, microprocessor 35, described signal generator 31 produces the sinusoidal wave test signal 36 of an access planar capacitor 1 and plane capacitive compensator 2, when described test signal 36 is flowed through described planar capacitor 1 and described plane capacitance compensator 2, be affected by the external environment and change, test signal 36 after two variations is imported described program control analog signal respectively and is amplified and filter circuit 32, amplify with filtering after, produce two d. c. voltage signals 37, two described d. c. voltage signals 37 are after described difference channel 33 carries out difference processing, produce a differential signal, described differential signal converts digital signal to via analog-digital conversion circuit as described 34, described microprocessor 35 receives described digital signal, this digital signal in microprocessor 35 through digital filtering, digital linearization handle and the adjustment of digital adaptation algorithm after form transducer numeral output control signal be sent to shielding LIN (LocalInterconnect Network scene is connected network) bus interface circuit 38, then, be sent to the control unit of automatic Wiper system by shielding LIN bus cable 18.After the rain brush work, this device continues glass surface is detected and form feedback signal, further controls the work of rain brush, constitutes closed-loop control system, thereby makes this device control the work of rain brush according to the size of raindrop.The test signal that the utility model provides also can be square-wave signal or triangular signal.The frequency of described test signal 36 can be between 100kHZ-1000kHZ, and the frequency that adopts in the present embodiment is 230KHZ, and the static capacitance value of described planar capacitor 1 and described plane capacitance compensator 2 is between 50-400pf.The capacitance that adopts in the present embodiment is 220pf.
Referring to Figure 15, among another embodiment that the utility model provides, described sensor detection circuit 3 comprises signal generator 31, program control analog signal is amplified and filter circuit 32, analog to digital conversion circuit 34, microprocessor 35, described signal generator 31 produces the test signal 36 of an access planar capacitor 1 and plane capacitive compensator 2, when described test signal 36 is flowed through described planar capacitor 1 and described plane capacitance compensator 2, be affected by the external environment and change, test signal 36 after two variations is imported described program control analog signal respectively and is amplified and filter circuit 32, amplify with filtering after, produce two d. c. voltage signals 37, two described d. c. voltage signals 37 convert two digital signals to via analog-digital conversion circuit as described 34 respectively, described microprocessor 35 receives two described digital signals, two described digital signals are carried out calculus of differences, and with the digital signal behind the calculus of differences in microprocessor 35 through digital filtering, digital linearization handle and the adjustment of digital adaptation algorithm after form transducer numeral output control signal be sent to shielding LIN (Local Interconnect Network scene is connected network) bus interface circuit 38, then, be sent to the control unit of automatic Wiper system by shielding LIN bus cable 18.After the rain brush work, this device continues glass surface is detected and form feedback signal, further controls the work of rain brush, constitutes closed-loop control system, thereby makes this device control the work of rain brush according to the size of raindrop.
In the foregoing description that the utility model provides, the electric conducting material that pole plate adopted of described planar capacitor 1 and plane capacitive compensator 2 is copper, aluminium, silver, conductive rubber, conductive plastics, conducting resinl or transparent conductive film, by multiple mounting means as: paste, press solidly, spray, the position that does not influence pilot's line of vision on vehicle glass 9 inner surfaces forms the required pole plate of described planar capacitor 1 and plane compensation condenser 2, pole plate can be multiple shape, for example rectangle, annular, fan-shaped, triangle or polygon.The ring plate that provides as Fig. 9.The pole plate that should guarantee planar capacitor 1 during installation closely contacts with glass 9 inner surfaces, avoids influencing because of the air gap performance of transducer, and the glass surface plating is a best choice.Experiment shows, the gross area of the pole plate of planar capacitor 1 less than 100 square centimeters can, but from saving cost, and the two-plate gross area of the described planar capacitor 1 of result of use is that the 10-20 square centimeter is best.And the two-plate gross area of plane capacitance compensator 2 is that the 5-11 square centimeter is best.
Claims (14)
1, a kind of plane capacitance sensor, comprise that one is installed in the planar capacitor (1) and a sensor detection circuit (3) that is connected with described planar capacitor (1) on the windshield (9), described planar capacitor (1) is as the senser of transducer, two pole plates of wherein said planar capacitor (1) are placed at grade, described sensor detection circuit (3) detects the affected by environment and electric capacitance change brought of described planar capacitor (1), and produce the control signal of control rain brush equipment work according to the electric capacitance change that detected, it is characterized in that: described sensor detection circuit (3) also is connected with the plane capacitance compensator (2) of an elimination interference signal, two pole plate is placed at grade, described plane capacitance compensator (2) is only as the senser that detects interference signal, described sensor detection circuit (3) detects the electric capacitance change that described plane capacitance compensator (2) is influenced by interference signal to bring, and compensates described planar capacitor (1) electric capacitance change of bringing affected by environment according to the electric capacitance change that is detected.
2, plane capacitance sensor as claimed in claim 1 is characterized in that: described plane capacitance compensator (2) be arranged in parallel before and after windshield (9) is gone up with described planar capacitor (1).
3, plane capacitance sensor as claimed in claim 2 is characterized in that: described plane capacitance compensator (2) is identical with shape, size, the static capacitance value of described planar capacitor (1).
4, plane capacitance sensor as claimed in claim 1 or 2, it is characterized in that: described planar capacitor (1) is positioned at the interlayer of windshield (9), and described plane capacitance compensator (2) is positioned at the inner surface of the windshield (9) relative with described planar capacitor (1) position.
5, plane capacitance sensor as claimed in claim 1 or 2, it is characterized in that: described planar capacitor (1) is close to the inner surface of windshield (9), described plane capacitance compensator (2) is positioned at the back of described planar capacitor (1), and by forming a determining deviation between an insulation material layer (4) and the described planar capacitor (1).
6, plane capacitance sensor as claimed in claim 1 is characterized in that: described plane capacitance compensator (2) is installed at grade with described planar capacitor (1).
7, plane capacitance sensor as claimed in claim 6 is characterized in that: described plane capacitance compensator (2) is installed on the inner surface of windshield (9) with described planar capacitor (1).
8, plane capacitance sensor as claimed in claim 6 is characterized in that: described plane capacitance compensator (2) is positioned at described planar capacitor (1) or near the side of described planar capacitor (1).
9, as claim 6 or 7 or 8 described plane capacitance sensors, it is characterized in that: described capacitive compensator (2) and shared one of them pole plate of described planar capacitor (1).
10, as claim 6 or 7 or 8 described plane capacitance sensors, it is characterized in that: the gross area of the two-plate of described plane capacitance compensator (2) is less than the gross area of the two-plate of described planar capacitor (1), and the spacing between the two-plate of described plane capacitance compensator (2) is less than the thickness of its position glass, and the spacing between the two-plate of described planar capacitor (1) is equal to or greater than the thickness of its position glass.
11, plane capacitance sensor as claimed in claim 1, it is characterized in that: the two-plate of described planar capacitor (1) and described plane capacitance compensator (2) is shaped as rectangle, annular, fan-shaped, triangle or polygon, the gross area of the two-plate of described planar capacitor (1) is the 10-20 square centimeter, and the gross area of the two-plate of described plane capacitance compensator (2) is the 5-11 square centimeter.
12, plane capacitance sensor as claimed in claim 1, it is characterized in that: described sensor detection circuit (3) comprises signal generator (31), program control analog signal is amplified and filter circuit (32), difference channel (33), analog to digital conversion circuit (34), microprocessor (35), described signal generator (31) produces the test signal (36) of an access planar capacitor (1) and plane capacitive compensator (2), when described test signal (36) is flowed through described planar capacitor (1) and described plane capacitance compensator (2), be affected by the external environment and change, test signal (36) after two variations is imported described program control analog signal respectively and is amplified and filter circuit (32), amplify with filtering after, produce two d. c. voltage signals (37), two described d. c. voltage signals (37) are after described difference channel (33) carries out difference processing, produce a differential signal, described differential signal converts digital signal to via analog-digital conversion circuit as described, described microprocessor receives described digital signal, described digital signal is handled, formed the transducer digital output signal of control appliance work.
13, plane capacitance sensor as claimed in claim 1, it is characterized in that: described sensor detection circuit (3) comprises signal generator (31), program control analog signal is amplified and filter circuit (32), analog to digital conversion circuit (34), microprocessor (35), described signal generator (31) produces the test signal (36) of an access planar capacitor (1) and plane capacitive compensator (2), when described test signal (36) is flowed through described planar capacitor (1) and described plane capacitance compensator (2), be affected by the external environment and change, test signal (36) after two variations is imported described program control analog signal respectively and is amplified and filter circuit (32), amplify with filtering after, produce two d. c. voltage signals (37), two described d. c. voltage signals (37) convert two digital signals to via analog-digital conversion circuit as described (34) respectively, described microprocessor (35) receives two described digital signals, two described digital signals are carried out calculus of differences, and form the transducer digital output signal of control appliance work according to the result of calculus of differences.
14, as claim 12 or 13 described plane capacitance sensors, it is characterized in that: described planar capacitor (1) is installed in the zone of windshield wiper work, in equipment work, this device continues glass surface is detected and form feedback signal, further control appliance work constitutes closed-loop control system.
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| CN 200620118051 CN2922285Y (en) | 2006-06-08 | 2006-06-08 | Planar condenser sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200620118051 CN2922285Y (en) | 2006-06-08 | 2006-06-08 | Planar condenser sensor |
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| CN 200620118051 Expired - Lifetime CN2922285Y (en) | 2006-06-08 | 2006-06-08 | Planar condenser sensor |
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