KR20190097942A - Sensing device and wiper driving device - Google Patents

Abstract

According to an embodiment, a sensing device comprises a substrate, an electrode disposed on the substrate, and a reaction layer disposed on the substrate and embedded in the electrode including a carbon microcoil; the electrode comprises a first electrode part having a positive polarity, and a second electrode part having a negative polarity; the first electrode part comprises a first feed electrode, and a first floating electrode spaced apart from the first feed electrode by a predetermined distance; and the second electrode part comprises a second feeding electrode, and a second floating electrode spaced apart from the second feed electrode by a predetermined distance. Therefore, the present invention is capable of maximizing a capacitance value which is additionally generated at the time of detecting rainwater, thereby improving a sensitivity of detecting rainwater.

Description

Sensor and wiper drive including the same {SENSING DEVICE AND WIPER DRIVING DEVICE}

The present invention relates to a sensing device, and more particularly, to a sensing device capable of detecting rainfall using a carbon micro coil (CMC).

Recently, as automobiles are popularized, automobiles are spreading rapidly across various classes and ages, and the technical trend of the automobile industry is to break away from the conventional mechanical point of view such as engines, and to electronicize each system for driver's convenience. And the situation is gradually changing to intelligent.

Recently, as a part of the electronic and intelligent of the vehicle, a technology for a vehicle rain sensor that attempts to automatically control the operation of the vehicle wiper according to the rainfall has been developed, so that the rain sensor for the vehicle does not operate the wiper in rainy weather. It detects and controls the wiper's operation automatically.

Conventional vehicle rain sensors have a light emitting unit and a light receiving unit inside the windshield of the car, and the optical conduction to determine the rainfall by using the change in the light intensity of the light receiving unit caused by the change in the refractive index of the light due to rain drops (rain drops) The method was mainly used.

However, the conventional optical sensor has a problem that the structure and installation is complicated and the cost of parts is high, leading to an increase in production cost, and the measurement accuracy is low because the measurement area is small and affected by contaminants. Had a problem.

Therefore, in order to solve this problem, a capacitive rain sensor for detecting rainfall using a change in capacitance of a capacitor installed inside the windshield of a vehicle has been recently developed, and the configuration and sensing principle of the rain sensor using the capacitive sensor Is disclosed in detail in the following [Document 1].

However, even in the rain sensor disclosed in [Document 1], when the vehicle is exposed to a high frequency (RF) environment such as a wireless communication area, the noise generated by the external high frequency (hereinafter referred to as 'high frequency noise'). It has a problem that the sensing accuracy is lowered due to the influence.

In recent years, as in [Document 2], by using a plurality of capacitors to detect all of the rainfall, high frequency noise and wiper noise, and remove the high frequency noise and the wiper noise from the detected rainfall when calculating the actual rainfall, Vehicle rain sensors that can detect rainfall significantly more stably and precisely than capacitive vehicle rain sensors according to technology have been developed.

However, the capacitive sensor as described above has a problem that its use is extremely limited due to its low sensitivity, and is vulnerable to high temperature or external environmental pollution.

[Document 1] Republic of Korea Patent Registration No. 10-781744 (2007.12.04. Registered notification)

[Document 2] Republic of Korea Patent No. 10-0943401 (2010.02.12. Registered notice)

In an embodiment according to the present disclosure, a sensing device including a carbon fine coil capable of amplifying rainwater sensing sensitivity is provided.

In addition, an embodiment according to the present invention provides a sensing device having an electrode structure capable of amplifying rainwater sensing sensitivity.

In addition, an embodiment according to the present invention provides a sensing device capable of minimizing signal interference by physically separating a reaction layer filling a positive electrode and a reaction layer filling a negative electrode.

The technical problems to be achieved in the proposed embodiment are not limited to the technical problems mentioned above, and other technical problems not mentioned above are clear to those skilled in the art to which the proposed embodiments belong from the following description. Can be understood.

The sensing device according to the embodiment includes a substrate; An electrode disposed on the substrate; And a reaction layer disposed on the substrate and filling the electrode, the reaction layer including a carbon fine coil, wherein the electrode includes a first electrode part having a positive polarity and a second electrode part having a negative polarity; The first electrode part includes a first feed electrode and a first floating electrode spaced apart from the first feed electrode by a predetermined distance, and the second electrode part is spaced apart from the second feed electrode and the second feed electrode by a predetermined distance. And a second floating electrode.

The apparatus may further include a feed terminal and a ground terminal disposed on the substrate, wherein the first feed electrode and the second feed electrode are connected to the feed terminal, and the first floating electrode and the second floating electrode include: It is connected to the folding terminal.

The first feed electrode, the second feed electrode, the first floating electrode, and the second floating electrode are each turned on the substrate a plurality of times.

In addition, the reaction layer includes a first reaction layer disposed on the substrate and embedding the first electrode portion, and a second reaction layer disposed on the substrate and filling the second electrode portion, The reaction layer is physically separated from the second reaction layer.

In addition, a first partition wall portion disposed on the substrate, surrounding the first reaction layer; And a second partition wall part disposed on the substrate and surrounding the periphery of the second reaction layer.

The first partition wall is physically separated from the second partition wall.

The apparatus may further include a processing element disposed under the substrate and connected to the first and second feed electrodes.

The processing element may include a sensing unit connected to the first and second feed electrodes and outputting a sensing signal according to a change in capacitance value in the reaction layer transmitted from the first and second feed electrodes. And a control unit communicating with a control unit to transmit the detection signal to the electronic control unit.

On the other hand, the wiper driving apparatus according to the embodiment includes a sensor that includes a carbon micro coil, and outputs a detection signal according to the change in the capacitance value formed by the carbon micro coil; And a vehicle controller configured to receive a sensing signal output from the sensor and determine a wiper driving condition according to the received sensing signal, wherein the sensor includes a substrate and a first polarity disposed on the substrate and having a positive polarity. An electrode including an electrode portion, a second electrode portion having a negative polarity, and a reaction layer disposed on the substrate to embed the electrode, wherein the reaction layer comprises the carbon fine coil, wherein the reaction layer comprises: the first electrode And a second reaction layer filling the portion and a second reaction layer filling the second electrode portion and physically separated from the first reaction layer.

The first electrode part may include a first feed electrode and a first floating electrode spaced apart from the first feed electrode by a predetermined distance, and the second electrode part may be formed from the second feed electrode and the second feed electrode. It includes a second floating electrode spaced apart at regular intervals.

The sensor may further include a feed terminal and a ground terminal disposed on the substrate, wherein the first feed electrode and the second feed electrode are connected to the feed terminal, and the first floating electrode and the second terminal are connected to the feed terminal. The floating electrode is connected to the folding terminal.

The sensor further includes a first partition wall part disposed on the substrate and surrounding the first reaction layer, and a second partition wall part disposed on the substrate and surrounding the second reaction layer.

The sensor may further include a processing element disposed below the substrate and connected to the first and second electrode parts, wherein the processing element is connected to the first and second feed electrodes, and the first and second feed electrodes. And a sensing unit for outputting a sensing signal according to a change in capacitance value in the reaction layer transmitted from the second electrode unit, and a sensor controller for communicating with the vehicle control unit to transmit the sensing signal to the vehicle control unit.

The sensing unit may include a first frequency generator for outputting a first frequency having an oscillation frequency corresponding to a change in capacitance value of the reaction layer, and a second frequency for outputting a second frequency corresponding to a preset reference oscillation frequency. And a difference frequency generator for outputting a difference value between the first frequency and the second frequency, and a filter for filtering the difference value output through the difference frequency generator within a predetermined filtering region.

According to an embodiment of the present invention, by additionally placing a floating electrode in the reaction layer in addition to the feed electrode, it is possible to maximize the capacitance value additionally generated during rain detection, thereby improving the rain water detection sensitivity.

In addition, according to an embodiment of the present invention, by minimizing the interval between the feed electrode and the floating electrode, or by extending the feed electrode and the floating electrode so as to have a square shape or a square spiral shape, to maximize the amount of change in the value of the capacitance It is possible to improve the rainwater detection sensitivity accordingly.

In addition, according to an embodiment of the present invention, by physically separating the reaction layer for embedding the negative electrode and the positive electrode, it is possible to minimize the signal interference generated between the negative electrode and the positive electrode, the signal-to-noise ratio accordingly Can improve.

1 is a flowchart showing a method of manufacturing a glass composition according to an embodiment of the present invention in the order of process.
2 is a view showing a carbon fine coil powder 1 according to an embodiment of the present invention.
3 is a view showing a glass composition (3) according to an embodiment of the present invention.
4 is a view showing the operating principle of the sensing device using the glass composition 3 according to an embodiment of the present invention.
5 is a view illustrating a capacitor function of the carbon micro coil according to an embodiment of the present invention.
6 is a view showing the reactivity evaluation of the glass composition (3) according to an embodiment of the present invention.
7 is a view showing the reactivity evaluation according to the content of the carbon fine coil powder (1) and the thickness of the glass composition (3) according to an embodiment of the present invention.
8 is a side view illustrating a state in which a sensing device is mounted on a front glass of a vehicle according to an exemplary embodiment of the present disclosure.
9 is a plan view of an electrode included in the sensing device of FIG. 8.
FIG. 10 is a cross-sectional view of an electrode included in the sensing device of FIG. 8.
FIG. 11 is a cross-sectional view illustrating a detailed structure of the sensing device of FIG. 8.
12 illustrates the characteristics of a carbon micro coil according to an embodiment of the present invention.
FIG. 13 is a diagram for explaining detection sensitivity of a two-line electrode structure according to the prior art. FIG.
14 is a diagram for describing sensing sensitivity of a four-line electrode structure according to an exemplary embodiment of the present invention.
15 is a view showing the configuration of a wiper drive system according to an embodiment of the present invention.
FIG. 16 is a diagram illustrating a configuration of the sensing unit 219 shown in FIG. 15.
17 to 19 illustrate changes in difference frequency values according to the first embodiment of the present invention.
20 is a view illustrating a change of a difference frequency value according to the second embodiment of the present invention.
21 to 23 are graphs illustrating change characteristics of the carbon micro coils according to the exemplary embodiment of the present invention.
24 is a flowchart for explaining a sensing method of a sensing apparatus according to an embodiment of the present invention step by step.
25 and 26 are views illustrating a case of a sensing device according to an embodiment of the present invention.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings, and the same or similar components are denoted by the same reference numerals regardless of the reference numerals, and redundant description thereof will be omitted. The suffixes "module" and "unit" for components used in the following description are given or used in consideration of ease of specification, and do not have distinct meanings or roles from each other. In addition, in describing the embodiments disclosed herein, when it is determined that the detailed description of the related known technology may obscure the gist of the embodiments disclosed herein, the detailed description thereof will be omitted. In addition, the accompanying drawings are intended to facilitate understanding of the embodiments disclosed herein, but are not limited to the technical spirit disclosed herein by the accompanying drawings, all changes included in the spirit and scope of the present invention. It should be understood to include equivalents and substitutes.

Terms including ordinal numbers such as first and second may be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

Singular expressions include plural expressions unless the context clearly indicates otherwise.

In this application, the terms "comprises" or "having" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

1 is a flowchart showing a method of manufacturing a glass composition according to an embodiment of the present invention in the order of process.

Here, the glass composition 3 comprises the reaction layer 216 of the sensing apparatus 200 described later. That is, the glass composition 3 is a reaction layer 216 formed by filling the plurality of electrodes 211 included in the sensing device 200. In addition, the reaction layer 216 has an inherent capacitance value of the carbon fine coil. The distance between the carbon micro coils is changed by a force or a change in dielectric constant applied by the sensing object in contact with the wind shield. In addition, the capacitance value of the carbon micro-coil changes the characteristic of the capacitance value according to the change of the distance. Therefore, in the present invention, the sensing object is detected based on the change amount of the capacitance value changed by the reaction layer 216.

Hereinafter, the glass composition 3 constituting the reaction layer 216 will be described in detail.

1, in order to manufacture the glass composition 3, the compounding process of the raw material which comprises the said glass composition 3 is first performed (step 1).

The blending process of the raw materials may largely include a raw material weighing process and a mixing process.

 First, in order to mix | blend the said raw materials, the raw material which comprises the said glass composition 3 is weighed according to an appropriate mixing ratio.

At this time, the raw material which comprises the said glass composition 3 contains the glass frit 2 and the carbon fine coil powder 1. The glass frit 2 is bonded with the carbon fine coil powder 1 during the firing process of the glass composition 3, and within the range below the reaction temperature of the carbon fine coil powder 1, the carbon from the external environment. The carbon fine coils grown by the fine coil powder 1 are protected.

The glass frit 2 may contain various metal oxides depending on the use. Preferably, the glass frit 2 may include silicon oxide, which is a main component of glass, and alternatively, the glass frit 2 may be a mixture of at least one of sodium carbonate, alumina, and borosilicate.

In addition, the glass composition 3 may include a metal oxide selected from the group consisting of lead oxide, tellurium oxide, bismuth oxide, zinc oxide, tungsten oxide, silicon oxide, and mixtures thereof.

As an example, the glass frit 2 may be formed of lead oxide-silicon oxide-tellurium oxide-zinc oxide (PbO-SiO2-TeO2-ZnO), silicon oxide-tellurium oxide-bismuth-zinc oxide-tungsten oxide-based. (SiO2-TeO2-Bi2O3-ZnO-WO3), lead oxide-silicon oxide-tellurium oxide-bismuth oxide-zinc oxide-tungsten oxide type (PbO-SiO2-TeO2-Bi2O3-ZnO-WO3), lead oxide-tellurium oxide Runium oxide bismuth oxide (PbO-TeO2-Bi2O3), or silicon oxide-tellurium oxide-bismuth oxide-zinc oxide-tungsten oxide type (SiO2-TeO2-Bi2O3-ZnO-WO3).

The glass frit 2 can be prepared from the metal oxides described above using conventional methods. For example, the metal oxides described above can be prepared by mixing to a specific composition. In this case, the mixing may be performed using a ball mill or a planetary mill. In this case, the mixed composition may be melted under conditions of 900 ° C.-1300 ° C. and quenched at 25 ° C. In addition, the resultant obtained by quenching may be pulverized by a disk mill, a planetary mill, or the like, to prepare a glass composition 3 according to an embodiment of the present invention.

At this time, in the mixing ratio of the glass composition 3, the glass frit 2 may be included within 90 to 99% by weight.

Next, the carbon fine coil powder 1 which comprises the said glass composition 3 is prepared. The carbon fine coil powder 1 includes a carbon fine coil.

2 is a view showing a carbon fine coil powder 1 according to an embodiment of the present invention.

Referring to FIG. 2, the carbon fine coil powder 1 is an amorphous carbon fiber having a unique structure that a fiber material does not have, including a carbon fine coil curled like a pig tail rather than a straight line. In addition, the carbon fine coil has a super elasticity that extends to a length of 10 times or more of the original coil length.

Morphology of the carbon micro coil has a 3D-helical / spiral structure, and the crystal structure is amorphous.

In other words, the carbon fine coil as described above is formed by growing carbon fibers in a coil shape, and thus has a cross-sectional structure in which carbon fibers are grown in coil shapes.

Herein, the carbon micro coils have different properties from carbon nano tubes. That is, the carbon nanotubes have a structure in which hexagonal carbons in the form of nanotubes are connected.

On the other hand, the carbon micro coil in the present invention has a form in which carbon is grown into coils of micro units using a catalyst rather than structural forms of carbon.

That is, the carbon nanotubes as described above obtain the measured value by changing the impedance from the conductor to the non-conductor by using the characteristics of the conductor and the non-conductor according to the form of the bonding of the elements themselves.

On the other hand, the carbon micro-coil according to the embodiment of the present invention, in the form of a coil made of carbon of the micro unit, the characteristics of L that vary as the coil is stretched and contracted by the force or dielectric constant change between each carbon micro coil The impedance varies depending on the interaction between the carbon micro coils due to the characteristics of C and the like due to distance.

That is, the carbon fine coil itself has a property of a conductor, but the curing agent, epoxy resin, and the like have properties of a non-conductor. Due to the above characteristics, the carbon micro coils have internal capacitance values. In addition, when the distance between the carbon micro coils is changed by a force or a dielectric constant change by the sensing object, the characteristic of the capacitance value of the carbon micro coils is changed.

In other words, the carbon micro coil has the characteristics of L-C-R, and thus has a frequency absorption characteristic, a heat generation characteristic, a proximity sensing characteristic, and a temperature characteristic when satisfying a predetermined condition.

On the other hand, the carbon fine coil powder (1) may be included in 1 to 10% by weight.

In addition, a raw material constituting the glass composition 3 may further include a binder. The binder may be included in the raw material constituting the glass composition 3 with a content of 1 wt% or less. The binder may be included in the raw material to increase the mixing uniformity between the glass frit 2 and the carbon fine coil powder 1. In addition, the binder (binder) may be selectively removed depending on the mixed state between the glass frit 2 and the carbon fine coil powder (1), or the content may be adjusted.

Material measurement according to the mixing ratio of the carbon fine coil powder (1) and the glass frit (2) as described above may be carried out through an electronic balance, Electron Probe Micro-Analysis (EPMA), Scanning Electron Microscope (SEM) and electron microscope. .

Next, when the carbon fine coil powder 1 and the glass frit 2 are measured as described above, a mixing process of mixing the measured glass frit 2 and the carbon fine coil powder 1 may be performed. .

The mixing process may be performed through a V-Mixer, a Ball-Mill and an ultra-vibration stirrer. When the mixing process is completed, the evaluation process for the mixing process may proceed. The evaluation process may evaluate the mixed state through an Electron Probe Micro-Analysis (EPMA), Scanning Electron Microscope (SEM), an electron microscope, and a particle size analyzer.

When the raw material blending process is completed, the process of plate molding the blended raw material proceeds (step 2).

The plate forming step may include a step of pressing the blended raw material. The pressing process may be performed by a press or a hot press device.

The process conditions of the pressing step include a pressure condition between 3 to 5 tons, a time condition between 5 minutes and 10 minutes, and a temperature condition at an ordinary temperature. When the pressing process is completed, the pressing process is evaluated. Evaluation of the pressing process may be performed through the sintered density appearing as the raw material is press-molded into a predetermined shape by the plate forming process.

When the pressing step is performed, a processing step of processing the pressed raw material is performed (step 3).

The processing step may include a sintering step of sintering the raw material in which the plate forming step is advanced.

The sintering process may be carried out in a sintering furnace, the sintering conditions including a temperature rising condition of 10 ℃ / min, sintering temperature conditions between 450 ℃ ~ 700 ℃, holding time conditions of 1 hour, and air atmosphere conditions have.

When the sintering process is in progress, an evaluation process may be performed in the sintering process, and the evaluation process may be performed with a sintered density of the sintered material in the composition in which the sintering process is performed.

3 is a view showing a glass composition (3) according to an embodiment of the present invention.

Referring to FIG. 3, as shown in (A), in the state in which the glass composition 3 is first blended and mixed, the raw material constituting the glass frit 2 and the carbon fine coil powder 1 are The constituent raw materials only have a mixed state.

In the sintering conditions as described above, when the raw materials are sintered at a temperature close to a predetermined melting point, bonding is performed at the bonding surface between the glass frit 2 and the carbon fine coil powder 1 or partially. Is deposited to produce one composition connected to one another.

As described above, when the sintering process proceeds, a reliability evaluation process of evaluating the glass composition 3 prepared above may be performed (step 4).

In this case, the glass composition 3 may be polished prior to the reliability evaluation process, and the polishing process may be selectively skipped.

The reliability evaluation process may be performed through an electrical evaluation process.

That is, for the electrical evaluation of the glass composition (3), the process of measuring the output value of each glass composition (3) can be carried out. In this case, the prepared glass composition 3 may include the carbon fine coil powder 1 in different contents. For example, a typical capacitive sensor (0 wt%) without the carbon fine coil powder (1), 1 wt% glass composition (3) with the carbon fine coil powder (1), 5 wt% Electrical evaluation of the glass composition (3) containing the carbon fine coil powder (1) and the glass composition (3) containing the carbon fine coil powder (1) may be performed at 10% by weight.

The electrical evaluation may be performed with an LCR meter capable of measuring the output value of the digital converter for converting the capacitance value of the glass composition 3 into a digital value and outputting it, or the L value / C value / R value, respectively. .

In addition, the electrical evaluation sets a capacitance value when no specific sensing object is present in the module region including the glass composition 3 as a reference value, and thus when the specific sensing object enters the module region. We can proceed with the change in the capacitance value of.

4 is a view showing the operating principle of the sensing device using the glass composition 3 according to an embodiment of the present invention.

Referring to FIG. 4, the glass composition 3 includes carbon fine coils grown by the carbon fine coil powder 1.

The magnetic field is generated around the glass composition 3 when the sensing object approaches a certain radius of the glass composition 3 or the sensing object contacts the surface of the glass composition 3 by the carbon fine coil. Done.

In addition, the arrangement state of the carbon micro coils included in the glass composition 3 is changed by the generated magnetic field, and a change in capacitance value of the glass composition 3 occurs accordingly.

In this case, an electrode (described later) may be disposed on the surface of the glass composition 3. The electrode is connected to a sensing unit (see FIGS. 15 and 219) and a control unit (see FIGS. 15 and 200), and the sensing unit 219 and the control unit 200 have capacitance values of the glass composition 3 through the electrodes. Acquire a change value of and thus detects the state of the sensing object. Here, the state of the sensing object may include a distance from the sensing object, a concentration of the sensing object, a temperature of the sensing object, and a humidity according to the sensing object. In addition, when the sensing object is water (eg, rainwater), the state of the sensing object may include the amount of water.

In other words, when the sensing object approaches the glass composition 3, an electrostatic induction phenomenon occurs. In addition, the carbon micro coil included in the glass composition 3 performs a function of a capacitor in series / parallel inside the electrode.

5 is a view illustrating a capacitor function of the carbon micro coil according to an embodiment of the present invention.

Referring to FIG. 5, as shown in (A), the carbon micro coil may serve as a series capacitor in which a plurality of capacitors are connected in series with each other.

In addition, as shown in (B), the carbon micro coil may serve as a parallel capacitor in which a plurality of capacitors are connected in parallel to each other.

6 is a view showing the reactivity evaluation of the glass composition (3) according to an embodiment of the present invention.

In FIG. 6, the result of comparing the capacitance change value of the capacitance sensor manufactured by the glass composition 3 including the carbon fine coil powder 1 according to the embodiment of the present invention with the capacitance change value of the general capacitance sensor. Shows.

For the experiment, four samples were prepared, the first sample consisting of a glass composition (3) containing an A content of carbon fine coil powder (1), and the second sample being a B content of carbon fine coil powder (1). ), And the third and fourth samples are capacitive sensors having different capacitance characteristics from each other without including the carbon fine coil powder (1).

The capacitance change values of the first to fourth samples are shown in the table below.

Sample 1
(CMC You # 1) Sample 2
(CMC You # 2) Sample 3
(CMC no # 1) Sample 4
(CMC no # 2) Street 1 1323 1374 859 897 Street 2 1066 1029 654 672 Street 3 708 687 450 464 Street 4 238 232 153 157 Street 5 32 31 17 17

Referring to Figure 6 and Table 1, it was confirmed that the reactivity for each distance according to the presence or absence of the carbon micro coil is significantly different. The distance 1 to the distance 5 is displayed by dividing 3mm ~ 15mm by step. The responsiveness is obtained by analog-to-digital conversion of the capacitance change value.

As described above, in the case of the sensor including the carbon fine coil, it had a change amount of capacitance value of about 1.55 times higher than that of the conventional sensor, and thus, it was confirmed that it was possible to provide a higher sensitivity sensing device.

7 is a view showing the reactivity evaluation according to the content of the carbon fine coil powder (1) and the thickness of the glass composition (3) according to an embodiment of the present invention.

FIG. 7 shows a comparison result of capacitance change values which are obtained by varying the content of the carbon fine coil powder 1 according to the embodiment of the present invention and changing the thickness of the glass composition 3 prepared accordingly. .

When the experimental results are shown in a table, it is shown in Table 2 below.

3 wt% 5 wt% 7 wt% 0T 29.60 29.60 29.60 0.2T 34.2 35.54 37.20 0.5T 36.13 37.9 39.20 1.0T 32.5 34.53 35.53 1.5T 33.17 33.93 34.43 2.0T 33.93 34.47 34.73

Referring to FIG. 7 and Table 2, it was confirmed that the reactivity was largely different depending on the presence / absence of the carbon fine coil and its content. In addition, it was confirmed that there is a difference in the reactivity according to the thickness of the glass composition (3) prepared by including the carbon fine coil powder (1). At this time, the content of the carbon fine coil powder (1) is 10 If the weight percentage is exceeded, it is unsuitable for the manufacturing process due to the viscosity increase, and accordingly the content of the carbon fine coil powder 1 is limited to 10% by weight.

As a result of the experiment, the carbon fine coil powder (1) contained 7 wt%, and showed the best change in capacitance value when the thickness of the glass composition (3) was 0.5T.

Hereinafter, a sensing device manufactured using the glass composition 3 prepared as described above will be described. In this case, the sensing device may include a temperature sensor, a humidity sensor, a proximity sensor, and the like. Meanwhile, hereinafter, the sensing device will be described with an example of a rain sensor mounted in a vehicle.

FIG. 8 is a side view illustrating a state in which a sensing device is mounted on a front glass of a vehicle according to an exemplary embodiment of the present disclosure, FIG. 9 is a plan view of an electrode included in the sensing device of FIG. 8, and FIG. FIG. 11 is a cross-sectional view of an electrode included in the sensing device, and FIG. 11 is a cross-sectional view showing a detailed structure of the sensing device of FIG. 8.

8 to 11, the sensing device 200 is mounted on the windshield 100 of the vehicle. The sensing device 200 is installed to face the windshield 10 of the vehicle. The sensing device 200 detects a change in capacitance value according to the presence or absence of raindrops falling on the windshield 10.

The sensing device 200 forms a sensing region at a predetermined position of the windshield 100 of the vehicle, and thus detects information according to the state of raindrops generated in the sensing region.

9 to 11, the sensing device 200 includes a substrate 201, a terminal 206, an electrode 211, partition walls 212 and 213, a reaction layer 216, a conductive portion 217, and a circuit. The pattern 218, the sensing unit 219, the controller 220, and the protection member 221 are included.

Here, the reaction layer 216 is composed of the glass composition 3 described above. In other words, the reaction layer 216 may be the glass composition 3.

The sensing device 200 as described above is disposed so that the reaction layer 216 faces the inner surface of the windshield 100 of the vehicle. In addition, the sensing device 200 provides information for driving the wiper by sensing the presence of raindrops contacting the outer surface of the windshield 100 and the amount of change in capacitance depending on the amount of raindrops. Here, the amount of change in the capacitance value may mean a change in impedance.

The substrate 201 is a base substrate on which the electrode 211, the reaction layer 216, the sensing unit 219, and the controller 220 are mounted.

An electrode 211 and a terminal 206 are disposed on the substrate 201. The electrode 211 is disposed on the upper surface of the substrate 201 while being embedded in the reaction layer 216.

The electrode 211 is formed in plural. In addition, the electrode 211 detects an amount of change in capacitance value generated as the sensing object approaches around the reaction layer 216.

The electrode 211 includes a first electrode 207 having a positive polarity and a second electrode 208 having a negative polarity. The first electrodes 207 and 209 and the second electrodes 208 and 210 respectively include a main electrode and a sub electrode.

In other words, the first electrodes 207 and 209 include a first feed electrode 207 that is fed and a first floating electrode 209 that is floated around the first feed electrode 207. In addition, the second electrodes 208 and 210 may include a second feed electrode 208 that is fed and a second floating electrode 210 that floats around the second feed electrode 208.

The first feed electrode 207 and the second feed electrode 208 are connected to the feed terminals 202 and 203, and thus are electrically connected to the sensing unit 219 and the control unit 220. .

The first floating electrode 209 and the second floating electrode 210 are closely disposed with the first feed electrode 207 and the second feed electrode 208, respectively, and thus inside the reaction layer 216. Increase the rate of change of the capacitance value at. In other words, conventionally, the electrode structure includes only the first feed electrode 207 and the second feed electrode 208.

The electrode structure senses the amount of rainwater using only the capacitance change value generated between the first feed electrode 207 and the second feed electrode 208. However, such an electrode structure has a relatively low difference value between the capacitance value when it does not rain and the capacitance value when it rains, and thus has difficulty in ensuring detailed detection sensitivity.

That is, the two-line electrode structure including only the first feed electrode 207 and the second feed electrode 208 as described above is a typical antenna structure, and the total wavelength of the two line electrodes is 1/4 of a specific frequency. When synchronized with wavelengths, electromagenetic compatibility (EMC) issues arise.

In addition, the mechanism of the general sensing device measures the change amount as a ratio of the capacitance change amount to the basic capacitance value. At this time, in order to increase the detection sensitivity, the basic capacitance value should be low or the capacitance change amount should be large. However, in the two-line electrode structure, there is a limit to lowering the basic capacitance value or increasing the capacitance change amount.

Therefore, in the present invention, the first floating electrode 209 closely disposed with the first feed electrode 207 is disposed around the first feed electrode 207 as described above. In addition, a second floating electrode 210 closely disposed with the second feed electrode 208 is disposed around the second feed electrode 208.

In this case, the first floating electrode 209 and the second floating electrode 210 are disposed at positions spaced apart from the first feed electrode 207 and the second feed electrode 208 by a predetermined distance, respectively.

The first floating electrode 209 and the second floating electrode 210 may be connected to ground terminals 204 and 205, respectively, and grounded.

At this time, in order to increase the detection sensitivity, the length of the first floating electrode 209 and the first feed electrode 207 while minimizing the distance between the first floating electrode 209 and the first feed electrode 207. Should be maximized.

Therefore, the first floating electrode 209 and the first feed electrode 207 may be disposed closely to each other while being spaced apart from each other on the substrate 201 by a predetermined interval. In addition, the first floating electrode 209 and the first feeding electrode 207 may be disposed on the substrate 201 by being turned at least once in a quadrangular shape so as to have a maximum length in a limited space. have. For example, as shown in FIG. 9, when the sensing device 200 is viewed from above, the first floating electrode 209 and the first feeding electrode 207 may have a rectangular shape or a rectangular spiral shape, respectively. Can be arranged.

More specifically, the first feed electrode 207 may extend by turning a plurality of times in a square shape or a square spiral shape from one end connected to the feed terminal 202 to the other end disposed in the reaction layer 216. That is, the first feed electrode 207 may be turned a plurality of times by extending from one end to a straight line and turning it once so that the path is changed in a right direction to become a quadrangular shape, and turning the inside twice. In this case, although the first feed electrode 207 is illustrated as being disposed 16 turns, the present invention is not limited thereto.

In addition, the first floating electrode 209 may be disposed to have the same shape as the first feed electrode 207 at a position spaced apart from the first feed electrode 207 by a predetermined interval. That is, the first floating electrode 209 may be extended by turning a plurality of times in a square shape or a square spiral shape from one end connected to the ground terminal 204 to the other end disposed in the reaction layer 216. In this case, although the first floating electrode 209 is illustrated as being turned 14 times, the present invention is not limited thereto.

Meanwhile, the first feed electrode 207 may be disposed at the outermost portion of the reaction layer 216, and the first floating electrode 209 may be closely disposed in the first feed electrode 207.

In addition, as shown in FIG. 9, the other end of the first feed electrode 207 and the other end of the first floating electrode 209 are not disposed in the same direction, but within the reaction layer 216. An electrode part including the other end of the first feed electrode 207 and an electrode part including the other end of the first floating electrode 209 are disposed to face each other.

In addition, the second feed electrode 208 may be extended by turning a plurality of times in a square shape or a square spiral shape from one end connected to the feed terminal 203 to the other end disposed in the reaction layer 216. That is, the second feed electrode 208 may be turned a plurality of times by extending in a straight line at one end and changing the path in a right angle so as to have a quadrangular shape, and turning it twice inward. In this case, although the second feed electrode 208 is illustrated as being disposed 16 turns, the present invention is not limited thereto.

In addition, the second floating electrode 210 may be disposed to have the same shape as the second feed electrode 208 at a position spaced apart from the second feed electrode 208 by a predetermined distance. That is, the second floating electrode 210 may be extended by turning a plurality of times in a square shape or a square spiral shape from one end connected to the ground terminal 205 to the other end disposed in the reaction layer 216. In this case, although the first floating electrode 210 is illustrated as being turned 14 times, the present invention is not limited thereto.

Meanwhile, the second feed electrode 208 may be disposed at the outermost portion of the reaction layer 216, and the second floating electrode 210 may be closely disposed in the second feed electrode 208.

In addition, as shown in FIG. 9, the turn is not terminated at the same position where the other end of the second feed electrode 208 and the other end of the second floating electrode 210 are located in the reaction layer 216. The turn ends so that the electrode portion including the other end of the second feed electrode 208 and the electrode portion including the other end of the second floating electrode 210 are disposed to face each other.

On the other hand, the reaction layer 216 is disposed on the substrate 201, thereby filling the electrode 211.

Preferably, the reaction layer 216 has a predetermined thickness and is disposed on the substrate 201 on which the electrode 211 is formed. Here, the electrode 211 includes all of the first feed electrode 207, the second feed electrode 208, the first floating electrode 209, and the second floating electrode 210.

The reaction layer 216 includes a conductive material and has a property of changing capacitance value according to changes in magnetic field, force, and dielectric constant generated by an external material.

Preferably, the reaction layer 216 comprises a carbon micro coil having a spring shape, which is the glass composition 3 described above.

The reaction layer 216 may have a change in capacitance due to a force applied as a specific material contacts the surface of the windshield 100 to which the sensing device 200 is attached, or the dielectric constant of the specific material.

In addition, the electrode 211 detects a change in capacitance value of the reaction layer 216, and accordingly transmits a sensing signal according to the change in capacitance value to the sensing unit 219.

In this case, the reaction layer 216 may be separated into a plurality of regions. Preferably, the reaction layer 216 includes a first reaction layer 214 in which an electrode having a positive polarity is embedded, and a second reaction layer 215 in which an electrode having a negative polarity is embedded. In addition, on the substrate 201, the first reaction layer 214 and the second reaction layer 215 are physically separated. In other words, the first reaction layer 214 and the second reaction layer 215 do not contact each other and are disposed on the substrate 201.

That is, a first electrode part including the first feed electrode 207 and the first floating electrode 209 includes a second electrode including the second feed electrode 208 and the second floating electrode 210. It has a different polarity from negative. Accordingly, when the first electrode portion and the second electrode portion are disposed in the same reaction layer 216, there is a problem in that signal-to-noise ratio (SNR) is deteriorated due to signal interference between the electrode portions.

Therefore, in the present invention, the first reaction layer 214 and the second feed electrode 208 and the first filling portion of the first electrode part including the first feed electrode 207 and the first floating electrode 209 are embedded. The SNR may be improved by physically separating the second reaction layer 215 filling the second electrode part including the second floating electrode 210 from each other.

The partition walls 212 and 213 surrounding the reaction layer 216 are disposed on the substrate 201. The partition walls 212 and 213 may surround the first partition wall 212 and the second reaction layer 215 according to the separation of the reaction layer 216. The second partition wall part 213 may be included.

The first and second partitions 212 and 213 may serve as partitions (or dams) that physically separate the reaction layer 216 into the first reaction layer 214 and the second reaction layer 215. have. In addition, the first and second partitions 212 and 213 may be formed for dispensing while maintaining the flatness of the upper surfaces of the first reaction layer 214 and the second reaction layer 215. The first and second partitions 212 and 213 may be formed of silicon.

The sensing unit 219 and the control unit 220 are disposed on the bottom surface of the substrate 201. Preferably, the sensing unit 219 and the control unit 220 are electrically connected to the circuit pattern 218 disposed on the bottom surface of the substrate 201. The sensing unit 219 detects rainfall and rainfall according to a detection signal transmitted through the electrode 211 and transmits the rainfall to the controller 220. The controller 220 communicates with the ECU (Electronic Control Unit) 300 of the vehicle based on the signal transmitted through the sensing unit 219. In this case, the controller 220 and the ECU 300 of the vehicle may exchange signals with each other through a local interconnect network (LIN).

That is, in general, REAL TERM of impedance is made of resistance, POSITIVE IMAGINARY TERM is made of inductance, and NEGATIVE IMAGINARY TERM is made of capacitance, and the resistance, inductance, and capacitance are summed up.

Thus, like a general resistor, inductor, and capacitor, the sensing device 200 also needs a pair of electrodes 211 to detect a change in capacitance value generated in the reaction layer 216.

The electrode 211 serves to connect the reaction layer 216 and the sensing unit 219 while optimizing the sensing characteristics of the reaction layer 216.

Here, when a specific force is applied to the surface of the windshield 100 or a material having a specific dielectric constant is in contact, the capacitance value of the reaction layer 216 is increased, so that the resistance value and the inductance value are In contrast to the capacitance value, it decreases.

In this case, the sensed impedance value is the sum of the resistance value, the inductance value, and the capacitance. Accordingly, the impedance value decreases linearly according to the degree of force or permittivity applied to the surface.

On the other hand, inside the substrate 201, one end of the conductive part 217 penetrating the substrate 201 is connected to the feed electrodes 207 and 208 and the other end is connected to the lower circuit pattern 218. Include. The conductive portion 217 is formed by filling through holes penetrating the upper and lower surfaces of the substrate 201 with a metal material.

One end of the conductive portion 217 penetrates the substrate 201 and is connected to the feeding electrodes 207 and 208, and the other end of the conductive portion 217 is a circuit pattern disposed on the bottom surface of the substrate 201. It is electrically connected to the sensing unit 219 and the control unit 220 through 218.

Meanwhile, the sensing unit 219 may include an analog front end (AFE). In this case, the AFE performs a differential amplification function, and there is a difference in the state of impedance change according to the occurrence of the rainfall depending on whether the differential amplification is positive or negative.

Therefore, the sensing unit 219 detects a change state of the impedance value based on a reference value according to the differential amplification state, and removes raindrops by driving the wiper when the change state is out of a threshold value. Do it.

Hereinafter, the driving step of the wiper will be described in more detail.

That is, when raindrops fall, the raindrops have a constant force on the windshield 100 or generate a change in permittivity. In addition, an impedance change occurs in the reaction layer 216 according to the applied force or the change in dielectric constant.

At this time, the change amount of the impedance may correspond to the rainfall and rainfall. That is, the force or dielectric constant applied to the reaction layer 216 increases in proportion to the rainfall, and the impedance change amount decreases in inverse proportion to the increase in the dielectric constant or the force.

As described above, when the rainfall occurs, an impedance change (specifically, a change in capacitance value) of the reaction layer 216 occurs, and an amplitude with respect to the internal clock of the sensing unit 219 according to the impedance change. Change occurs.

The differential signal according to the differential amplification of the AFE of the sensing unit 219 is output according to the amplitude change of the internal clock. Thereafter, when the differential signal is output, the output differential signal is converted into a digital signal and transmitted to the ECU 300 of the vehicle through the controller 220.

The ECU 300 of the vehicle determines whether the rainfall and rainfall based on the impedance change amount according to the transmitted digital signal, when the rainfall occurs, and the rainfall exceeds the threshold, the wiper for removing raindrops Start up.

Hereinafter, the driving principle of the sensing device 200 will be described in more detail.

As described above, an electrode 211 including the plurality of feed electrodes and the plurality of floating electrodes is embedded in the reaction layer 216 made of a carbon fine coil. In this case, the reaction layer 216 may determine whether or not rainfall and rainfall according to the impedance change amount by itself, the measurement sensitivity also varies depending on the shape of the electrode 211. Accordingly, in the embodiment, the electrode 211 including the plurality of feeding electrodes and the floating electrode having the square shape or the square spiral shape as described above is formed.

In addition, as described above, the impedance includes a real part and an imaginary part, and the imaginary part comprises a positive imaginary part and a negative imaginary part, wherein the carbon micro coil is included. The sensing device 200 measures using two characteristic changes of the positive imaginary part (inductive) and the negative imaginary part (capacitive).

That is, when it rains, the force applied to the windshield 100 of the vehicle varies according to the amount of rain, and also the amount of water (raindrops) present in the windshield 100 varies.

At this time, the carbon micro coil is composed of a very fine coil group as its name, it is also a dielectric having a dielectric constant. In this case, the force is measured through the change of the inductive component, that is, the characteristic change of the carbon fine coil, and the amount of water present on the windshield 010 is measured by the capacitive change caused by the change in dielectric constant.

In other words, each layer constituting the sensing device 200 serves as a dielectric having a specific dielectric constant. If it rains as described above, a new dielectric, water, is present at the electrode, resulting in a capacitive change. ..

In this case, the real part may be adjusted according to the area of the reaction layer 216. In addition, in the raining situation, the reaction layer 216 may change in impedance value due to inductive and capacitive value changes as described above.

Therefore, in the embodiment, the change in the impedance value according to the inductive and capacitive value changes of the sensing device 200 as described above determines whether the rainfall and rainfall.

On the other hand, the sensing device 200 as described above forms an adhesive member (not shown), such as silicon, inside the windshield 100, and is mounted on a specific inner region of the windshield 100 by the adhesive member. do. In this case, the sensing device 200 detects a change in impedance in consideration of the dielectric constant of the adhesive member.

Hereinafter, the operation of the sensing unit 219 will be described in more detail.

The sensing unit 219 is connected to the electrode 211 and generates an oscillation frequency according to the impedance change of the reaction layer 216 generated according to rainfall or rainfall, and the oscillation frequency and the reference frequency are different from each other. Determine rainfall and rainfall accordingly.

In this case, the sensing unit 219 detects whether the difference frequency between the oscillation frequency and the reference frequency belongs in a predetermined filtering region, and corresponds to the difference frequency only when the difference frequency exists within the predetermined filtering region. Outputs a digital value.

In this case, the above operation is performed by the sensing unit 219, but this is only an embodiment, and the sensing unit 219 may output only a digital value according to a sensing signal transmitted from the electrode. In the control unit 220, the following specific sensing operation may be performed.

That is, the sensing unit 219 may include one of a low pass filter (LPF) and a band pass filter (BPF) according to the characteristics of the sensing device 200.

In addition, the low pass filter and the band pass filter have different filtering frequency ranges.

12 illustrates the characteristics of a carbon micro coil according to an embodiment of the present invention.

As illustrated in FIG. 12, the carbon micro coil has a first inductance value, and the inductance value decreases as a force or dielectric constant is applied to the carbon micro coil.

The inductance value has a different amount of reduction depending on the type of material placed on the carbon micro coil.

That is, the inductance value has a relatively small amount of reduction when rainwater is in contact with the carbon micro coils, and has a higher amount of reduction than when the rainwater is in contact with a part of a human body such as a person. If the material is in contact with the rain water or the human body will have a higher amount of reduction than.

Hereinafter, the sensing sensitivity of a general 2-line electrode structure and the sensing sensitivity of a 4-line electrode structure according to an exemplary embodiment of the present invention will be described.

13 is a view for explaining the sensitivity of the two-line electrode structure according to the prior art, Figure 14 is a view for explaining the sensitivity of the four-line electrode structure according to an embodiment of the present invention.

First, referring to FIG. 13, the sensing unit 219 generates the first frequency f1, and accordingly the capacitance value according to the internal capacitance value Cr and the capacitance value Cs of the reaction layer 216. The final amount of change is output according to the amount of change.

In this case, the change ratio when the rain does not rain on the windshield 100 and the change ratio when the rain appears are as follows.

Ro = Cs / Cr: Change ratio when there is no rain

Rr = (Cs + △ Cr) / Cr: change ratio when coming

Here, Cs is a capacitance value in the reaction layer 216, Cr is a reference capacitance value in the sensing unit 219, and ΔCr is a capacitance value that may additionally occur in the rain.

As described above, when the ΔCr is increased as much as possible under the same Cr condition, the Rr increases accordingly, and the sensing unit 219 signals the change rate according to the increasing Rr based on this.

Referring to FIG. 14, FIG. 14A illustrates capacitance values that may occur in an upper direction and a lower direction of the sensing device 200, and FIG. 14B illustrates a sensing device. Shows capacitance values that may occur in the lateral direction of 200.

Referring to FIG. 14A, the capacitance value generated in the upper direction is referred to as C21 between the first feed electrode 207 and the second feed electrode 208, and the capacitance value generated in the lower direction is referred to as C1. can do. The capacitance value generated in the upper direction between the first feed electrode 207 and the first floating electrode 209 may be referred to as C31. In addition, the capacitance value generated in the upper direction between the second feed electrode 208 and the second floating electrode 210 may be referred to as C32. In addition, a capacitance value generated in the downward direction between the first floating electrode 209 and the second floating electrode 210 may be referred to as C0.

In addition, referring to FIG. 14B, a capacitance value generated in the lateral direction between the first floating electrode 209 and the second floating electrode 210 may be referred to as C22.

Here, since C0 and C1 are matters commonly applied to the four-line electrode structure of the present invention and the conventional two-line electrode structure, they are excluded from the following comparison.

In addition, in the present invention, by applying a floating electrode in addition to the feed electrode as described above, ΔCr, which means a capacitance value additionally generated when it rains, is maximized.

The following is a comparison of the conventional two-line electrode structure in the case of no rain and in the case of rain with the four-line electrode structure of the present invention.

First, the conventional two-line electrode structure can be expressed as follows.

(1) Cs1 = C21, Ro = C21 / Cr

: Change ratio of the conventional two-line electrode structure when no rain

Here, Cs1 denotes a capacitance value in the reaction layer 216 of the two-line electrode structure, Cr denotes a reference capacitance value in the sensing unit 219, and Ro denotes a change ratio of the capacitance value when no rain occurs. Means.

(2) Cs1 = C21 + ΔCr21, Rr = (C21 / Cr) + (ΔCr21 / Cr)

: Change ratio of the conventional two-line electrode structure when it rains

Next, the four-line electrode structure according to the present invention can be expressed as follows.

(1) Cs2 = C21 + (C31 / C32 / C22), Ro = (C21 / Cr) + ((C31 / 32 / C22) / Cr)

: Change ratio of 4-line electrode structure of the present invention when no rain

Here, Cs1 denotes a capacitance value in the reaction layer 216 of the four-line electrode structure, Cr denotes a reference capacitance value in the sensing unit 219, and Ro denotes a change ratio of the capacitance value when no rain occurs. Means.

(2) Cs2 = C21 + ΔCr21 + ((C31 + ΔCr31) / (C32 + ΔCr32) / (C22 + ΔCr22))

Rr = (C21 / Cr) + (ΔCr21 / Cr) + ((C31 + ΔCr31) / (C32 + ΔCr32) / (C22 + ΔCr22) / Cr)

: Change ratio of 4-line electrode structure of the present invention when it rains

As described above, in the four-line electrode structure of the present invention, in contrast to the conventional two-line electrode, the floating electrode corresponding to the portion of (C31 + ΔCr31) / (C32 + ΔCr32) / (C22 + ΔCr22) / Cr ”is used. There is a change in the value of the additional capacitance due to, it is possible to improve the detection sensitivity based on the change in the value of the additional capacitance.

15 is a view showing the configuration of a wiper drive system according to an embodiment of the present invention.

Referring to FIG. 15, the wiper driving system is largely divided into a sensing device 200 and a vehicle. Here, the vehicle may be divided into an ECU 300 for controlling the overall operation of the electronic device of the vehicle, an operation unit 400 for manipulating the operation of the wiper, and a motor 500 for driving the wiper.

As described above, the sensing device 200 includes a sensing unit including the reaction layer 216, an electrode 211, and the like, and a sensing unit 219 and a controller 220. Here, the control unit 220 is a slave control unit that communicates with the control unit 301 in the ECU 300 of the vehicle.

As described above, the capacitance change in the reaction layer 216 occurs when the rain glass does not come on the windshield 100 as described above, and transmits the change signal to the sensing unit 219.

The sensing unit 219 generates a first frequency, generates a second frequency that changes according to the change in the capacitance value, and detects whether the rain falls and the amount of rain according to the difference between the first and second frequencies. do. Detailed operations of the sensing unit 219 will be described in detail below.

The control unit 220 communicates with the control unit 301 in the ECU 300 of the vehicle, and thus applies an algorithm for optimizing mutual communication. The control unit 220 controls the sensing unit 219 according to the control signal of the control unit 301 in the ECU 300 of the vehicle, and the signal sensed by the sensing unit 219 is controlled by the ECU 300 of the vehicle. Transfers to the control unit 301 in FIG.

In this case, the controller 220 and the controller 301 in the ECU 300 of the vehicle may exchange information with each other according to a local interconnect network (LIN).

The LIN operates according to the master-slave principle. Its signal type and protocol (= format of digital information) are standardized. Here, the master-slave principle is a system in which one master-master and a plurality of slaves connected and connected online are divided and processed according to each data processing content. Also known as a master-slave system.

On the other hand, the ECU 300 controls the overall operation of the electrical equipment of the vehicle. In particular, the ECU 300 controls the operation of a wiper (not shown).

The operation unit 400 is installed in a specific area of the vehicle's interior, whereby the driver manually operates the wiper.

The motor 500 is connected to the wiper, thereby providing a driving force for operating the wiper.

The ECU 300 is connected to the sensing device 200 and the operation unit 400, and accordingly outputs a motor driving signal for controlling the operation of the wiper. To this end, the controller 301 is connected to the sensing device 200, and thus receives a sensing signal output from the sensing device 200. In this case, the sensing signal may have a specific digital value, and the controller 301 may calculate whether the rain is based on the digital value and the amount of the rain.

In addition, the controller 301 determines whether a wiper operation signal is input from the operation unit 400. At this time, the communication unit 304 is disposed between the control unit 301 and the operation unit 400. The communication unit 304 transmits an operation signal input from the operation unit 400 to the control unit 301 according to a local interconnect network (LIN) method.

The controller 301 outputs a driving signal for driving the wiper by using an operation signal transmitted through the communication unit 304 and a detection signal transmitted through the detection device 200.

The signal processor 302 processes the driving signal output through the control unit 301 and accordingly outputs a motor control signal according to the driving signal.

The motor driver 303 drives the motor 500 using a drive signal signal-processed through the signal processor 302. In this case, the motor driving unit 303 controls the driving of the motor 500 and the driving speed based on whether or not the rain, the operation signal is input, the amount of rain or the speed manually set. Output the signal.

FIG. 16 is a diagram illustrating a configuration of the sensing unit 219 shown in FIG. 15.

Referring to FIG. 16, the sensing unit 219 includes a first frequency generator 2191, a second frequency generator 2192, a difference frequency generator 2193, a filter 2194, and an analog-to-digital converter 2195.

The first frequency generator 2191 is connected to the sensing unit and generates a first frequency according to the impedance change of the sensing unit.

The first frequency generator 2191 may be configured as an LC oscillation circuit.

Preferably, the first frequency generator 2191 is configured to generate an oscillation frequency that is changed by a change in the inductance value of the carbon fine coil by using the carbon fine coil and the capacitor constituting the sensing unit.

That is, the first frequency generator 2191 oscillates the oscillation frequency by the sensing unit using a carbon micro coil attached to the wind shield.

In other words, the inductance value of the carbon micro coil constituting the sensing unit and the capacitance value of the capacitor determine the oscillation frequency of the first frequency generator 2191.

The second frequency generator 2192 may be a reference oscillator, and generates a second frequency corresponding to the reference oscillation frequency.

In this case, the first frequency generated by the first frequency generator 2191 may have a minute change. Accordingly, in the first embodiment of the present invention, the filter 2194 is configured as a low pass filter.

In the following description, it is assumed that the filter 2194 is configured as a low pass filter.

At this time, in a state where no rainfall occurs in the sensing unit, the first frequency generated by the first frequency generator 2191 and the second frequency generated by the second frequency generator 2192 may be set to have the same value. Can be.

When the rainfall occurs in the sensing unit, the difference between the first frequency and the second frequency increases according to the rainfall, and the rainfall may be determined based on the increased difference value.

In this case, when the inductance of the carbon micro coil included in the sensing unit is referred to as L and the capacitance of the capacitor as C, the first frequency ω ₀ generated by the first frequency generator 2191 is represented by Equation 1.

The first voltage value V ₀ corresponding to the first frequency generated by the first frequency generator 2191 is represented by Equation 2 below.

In addition, the second voltage value Vr corresponding to the second frequency generated by the second frequency generator 2192 is expressed by Equation 3 below.

The difference frequency generator 2193 is connected to the first frequency generator 2191 and the second frequency generator 2192, and includes a first frequency generated by the first frequency generator 2191 and a second frequency generator 2192. Outputs a difference value corresponding to the difference in the second frequency generated by

At this time, the difference value Vdmod generated by the difference frequency generator 2193 is expressed by Equation 4 below.

Here, the reason why the difference value has the same value as in Equation 4 is that the first frequency generated by the first frequency generator 2191 and the second frequency when no rainfall occurs in the detector. This is because the second frequencies generated by the generator 2192 have the same value.

The filter 2194 filters the output value generated by the difference frequency generator 2193 and outputs the filtered output value.

In this case, the filter 2194 includes a filtering region corresponding to a frequency range having a predetermined size, and filters the output value of the difference frequency generator 2193 within the filtering region.

Here, the filtering region may be determined by the type of the filter 2194 and the change characteristic of the carbon micro coils when the rainfall occurs in the sensing unit.

Change characteristics of the carbon micro coil will be described in more detail below.

On the other hand, the type of filter 2194 may be determined by the structure of the carbon fine coil.

That is, the inductance value of the carbon fine coil does not change within a large range depending on rainfall or rainfall, and changes finely, and the first frequency generated by the first frequency generator 2191 according to the minute changing value. When there is no significant difference from the second frequency generated by the second frequency generator 2192, the filter 2194 may be configured as a low pass filter.

In addition, when the first frequency generated by the first frequency generator 2191 is significantly different from the second frequency generated by the second frequency generator 2192 according to a change in the inductance value of the carbon fine coil. The filter 2194 may be configured as a band pass filter.

In other words, the type of the filter 2194 may be determined by a structure such as the area of the carbon micro coil constituting the sensing unit.

The analog-to-digital converter 2195 converts an output value output through the filter 2194 into a digital value and outputs the digital value.

17 to 19 illustrate changes in difference frequency values according to the first embodiment of the present invention.

Referring to FIG. 17, when a dielectric constant does not occur without a specific material contacting the sensing unit, a first frequency generated by the first frequency generator 2191 and a second frequency generator 2192 may be used. The occurring second frequency may have the same frequency.

Accordingly, the output value filtered by the filter 2194 is almost a DC voltage level according to the output value output from the difference frequency generator 2193 in the state where the rainfall does not occur.

In addition, referring to FIG. 18, when a specific material contacts the sensing unit, a change in dielectric constant occurs, and when the contact material is rainwater caused by rainfall, the output value filtered by the filter 2194 is within a predetermined filtering area. Frequency shift occurs at.

In other words, when a change in inductance value of the carbon micro coil of the sensing unit occurs as the rainfall occurs, a change in the first frequency generated in the first frequency generator 2191 occurs, and accordingly the first frequency There is a difference between and the second frequency.

At this time, the difference frequency between the first frequency and the second frequency is increased according to the intensity (rainfall amount) of the generated rainfall.

Accordingly, in the embodiment of the present invention, the rainfall may be determined according to the value of the difference frequency between the first frequency and the second frequency. In other words, in an embodiment of the present invention, whether the rainfall and the rainfall is determined according to the frequency domain change amount according to the signal output from the filter 2194.

Here, the difference between the first frequency and the second frequency may be caused by rain or moisture due to rainfall, and may also be caused by other foreign matters.

The foreign material may include a human body, paper, stone, and metal material.

Here, the carbon micro coil has a different degree of change in inductance value due to rainfall and a change degree of inductance value due to foreign matter such as the human body, paper, stone, and metal material.

In other words, the inductance value of the carbon micro coil is different from the threshold of the change caused by the rainfall and the threshold of the change caused by the foreign body such as the human body, paper, stone, and metal material.

Therefore, it is possible to distinguish whether the difference between the first frequency and the second frequency is caused by rainfall or foreign matter according to the change threshold of the inductance value (change characteristic of the carbon micro coil).

In an embodiment, the filtering region of the filter 2194 is determined according to the change characteristic of the carbon micro coils generated by the respective materials, and the difference between the first frequency and the second frequency within the determined filtering region. The wiper can optionally be driven only if

Referring to FIG. 19, when the difference between the first frequency and the second frequency is caused by a foreign matter rather than the rainfall, the difference frequency may have a frequency outside the filtering area of the filter 2194.

In this case, since the difference frequency is not included in the filtering region as shown in FIG. 15, the wiper is not driven in this case.

20 is a view illustrating a change of a difference frequency value according to the second embodiment of the present invention.

Referring to FIG. 20, when the design of the sensing unit is different from the second frequency when the first frequency when the rainfall does not occur, and the degree of increase or decrease of the first frequency when the rainfall occurs is large, The filter 2194 may be configured as a band pass filter.

In this case, the filtering region of the filter 2194 may have a different frequency range than that of the low pass filter.

In addition, rainfall and rainfall may be determined according to the degree of movement of the difference frequency generated by the change of the difference frequency in the filtering region.

In this case, when the filter 2194 is a band pass filter, the output value of the difference frequency generator 2193 is expressed by Equation 5 below.

21 to 23 are graphs illustrating change characteristics of the carbon micro coils according to the exemplary embodiment of the present invention.

Referring to FIG. 21, the carbon micro coils are formed according to stones, paper, servo motors, mobile phones 1 (power off state), mobile phones 2 (power on state), mobile phones 3 (battery disconnected state), battery, multimeter, and water. It will have different change characteristics.

In other words, the carbon micro coils generate different output values according to the above materials.

As a result of the change in the output value of the carbon micro coil, different changes occurred according to the contact area and the contact direction even with the same stone. As the size of the stone increases, the weight and the contact area increase to increase the output value.

Also, even when a nonmagnetic material such as paper or a magnetic material such as a servo motor is in contact, a large change in output value occurs without being influenced by a magnetic field.

Referring to FIGS. 22 and 23, the output value of the carbon micro coil according to the present invention has distinct characteristics when the human body contacts and when the water contacts the rainfall.

That is, the output value of the carbon micro coil has a negative value when the human body contacts, and has a positive value when water such as rainfall contacts.

Therefore, in the present invention, the difference between the first frequency generated in the first frequency generator 2191 and the second frequency generated in the second frequency generator 2192 based on the characteristics of the carbon fine coil as described above is caused by the contact of the human body. It can be clearly distinguished whether it is caused by rain or by rainfall.

Accordingly, in the present invention, the reaction region of the sensing device 200, that is, the filtering region of the filter 2194 is determined based on the characteristics of the carbon micro coils reacted by the rainfall.

Therefore, in the present invention, the sensing unit may operate only when the rainfall is sensed using the characteristics of the carbon fine coil as described above, and the wiper may not be operated when a change is detected by a foreign object such as a human body.

That is, in general, the driver operates the wiper automatically, but there are cases in which children touch the rain sensor placed on the front of the windshield due to curiosity. According to the related art, the detection of the rain sensor is performed in the above case. There was a risk of injury to young children due to the wiper operation.

However, in the present invention, even when a difference between the first frequency and the second frequency occurs when the human body of the young children is in contact with each other, the safety of the wiper is further prevented.

As described above, in the present invention, rainfall and rainfall are determined based on a change value of the oscillation frequency generated according to the change in inductance of the carbon micro coil.

Meanwhile, in the conventional technology using the conventional optical method, an optical sensor recognized by the photodiode is different according to the external illumination despite the same rainfall, and an optical sensor for correcting this should be additionally applied. Only when a certain level of light is emitted, a roughness sensor to prevent a malfunction should be additionally applied, and a supplementary means for verifying a malfunction due to a change in external environment is essential.

In addition, the prior art using the conventional impedance method requires the development of separate circuit algorithm software so that the rain sensor does not react at the sensing level above a certain threshold, and the specific level of a specific material (stone, person, metal, etc.) It is necessary to proceed with the sensing level database, and in the non-operation, the wiper drive must be changed manually. Therefore, a means of preventing the wiper malfunction by accessing the rain sensor to a specific foreign object is necessary rather than changing the external environment.

However, in the present invention, since the external environment does not affect the characteristics of the rain sensor at all, an additional correction sensor for characteristic correction is unnecessary, thereby reducing the cost.

In addition, in the present invention, since it is possible to measure rainfall and rainfall even with a slight change in inductance, it is possible to detect a low level of rainfall and to avoid foreign matter on the windshield circuitry without applying a separate software algorithm to avoid foreign matter. can do.

24 is a flowchart for explaining a sensing method of a sensing apparatus according to an embodiment of the present invention step by step.

Referring to FIG. 24, first, the first frequency generator 2191 generates a first frequency according to an inductance value of the carbon micro coil constituting the sensing unit (step 10).

The second frequency generator 2192 generates a second frequency corresponding to the preset reference oscillation frequency (step 11).

Subsequently, the difference frequency generator 2193 receives the first frequency generated by the first frequency generator 2191 and the second frequency generated by the second frequency generator 2192, and accordingly the first frequency and the second frequency. The difference frequency of two frequencies is output (step 12).

Accordingly, the filter 2194 filters the output difference frequency to determine whether the difference frequency exists in a predetermined filtering region (step 13).

If the difference frequency is present in the predetermined filtering region, the analog-to-digital converter 2195 generates and outputs an output value corresponding to the difference frequency. Then, the control unit receives the output value, and detects whether the rainfall and the rainfall according to the received output value (step 14).

Subsequently, the controller determines a driving condition of the wiper based on the detected rainfall, and controls the wiper to be driven according to the determined driving condition (step 15).

On the other hand, if the received difference frequency does not exist in the predetermined filtering region, the filter 2194 does not output an output value corresponding to the received difference frequency, thereby ignoring the received difference frequency (16). step).

That is, when a difference between the first frequency and the second frequency is caused by a foreign substance, the difference frequency does not exist in the filtering region, and thus the rain sensor does not react.

25 and 26 show a case of a sensing device according to an embodiment of the present invention.

Referring to FIGS. 25 and 26, the sensing device 200 surrounds the substrate 201 and has a housing space accommodating the electrode, the partition wall, the reaction layer, the sensing unit, and the controller therein. 221 is disposed.

The case 221 has an accommodating space therein, and includes a first case 2211 in which the sensing device 200 is accommodated in the accommodating space, and a lower portion of the first case 2211. And a second case 2212 covering the lower region of 2211.

The first case 2211 includes an upper surface portion 22111 forming an upper surface appearance. The upper surface portion 22111 has an outer surface in contact with a structure to be mounted, and an inner surface in contact with a sensing device accommodated therein. Preferably, the inner surface of the upper surface portion 22111 is in direct contact with the upper surfaces of the reaction layers 214 and 215 of the sensing device accommodated therein.

The outer surface of the first case 2211 is in direct contact with the windshield 100 provided in the vehicle. Preferably, the outer surface of the first case 2211 may include a material having an adhesive force, and thus the outer surface of the first case 2211 and the front glass 100 may directly contact each other.

In addition, a separate adhesive member (not shown) may be disposed on the outer surface of the first case 2211, and thus, between the windshield 100 and the upper surface of the first case 2211 may be disposed. The adhesive member may further be disposed.

The first case 2211 includes a side portion 22112 that is bent substantially vertically downward from the side end of the upper surface portion 22111 and extends to a predetermined length.

The side portion 22112 is disposed to surround the side of the upper surface portion 22111, and opens the lower portion of the upper surface portion 22111. The height of the side portion 22112 may correspond to the height of the sensing device.

On the inner surface of the side portion 22112, an insertion groove 22114 recessed in the outward direction of the side portion 22112 is formed. The plurality of insertion grooves 22114 are formed in the side portion 22112. In other words, the hook portion 22123 formed in the second case 2212 is inserted into the insertion groove 22114, thereby corresponding to the position of the hook portion 22123 and the number of the hook portions 22123. Is formed.

On the other hand, the side portion 22112 may be composed of four. That is, the upper surface portion 22111 may have a square shape, and the side surface portion 22112 may vertically extend downward from four ends of the upper surface portion 22111.

In this case, at least one of the side parts 22112 is formed with a first opening part 22115 having a lower portion of the side part 22112 recessed in an upward direction. The first opening part 22115 exposes at least a portion of the sensing device 200 accommodated in the first case 2211. Preferably, the first opening part 22115 exposes an interface of the control unit 220 of the sensing device 200. A communication line (not shown) between the controller 220 and the controller 301 of the ECU 300 may be inserted into the first opening part 22115.

The second case 2212 covers the open lower portion of the first case 2211. To this end, the second case 2212 includes a lower surface portion 22121 and a side portion 22122 that is bent upward from the lower surface portion 22121.

In this case, the lower surface portion 22121 may not have a flat shape on the outer surface and the inner surface, and the inner surface may gradually increase from the left side to the right side. In other words, the lower surface portion 22121 may have a predetermined inclination angle and may have a shape in which the height gradually decreases from the left side to the right side. Preferably, the lower surface portion 22121 may have an inclined shape corresponding to the inclination angle of the front glass 100 to which the first case 2211 is attached.

The side portion 22122 may be formed to extend in an upward direction from the side end of the lower surface portion 22121. At this time, the upper surface of the side portion 22122 may be disposed to be on the same plane in the entire area. Accordingly, the heights of the side parts 22122 may be different from each other according to regions. Preferably, the lower surface portion 22121 has different heights according to positions, and accordingly, the side portions 22122 may also have different heights according to positions.

In addition, a hook portion 22123 protruding in the upper direction of the side portion 22122 is disposed in the side portion 22122 and the bottom surface portion 22121. The hook portion 22123 is fitted into the insertion groove 22114.

In addition, a second opening portion 22124 corresponding to the first opening portion 22115 is formed in at least one region of the side surface portion 22122. The second opening part 2214 is coupled to the first opening part 22115 to partially open the inner accommodation spaces of the first and second cases 2211 and 2212 to insert the communication line.

According to the embodiment, when the rainfall occurs, by immediately responding to the driving conditions to drive the wiper in accordance with the rainfall, it is possible to improve the driver's convenience in the rain.

In addition, according to the embodiment, by determining whether the rainfall and rainfall by using the carbon micro coil, it is possible to provide a rain sensor of the characteristics (response characteristics, precision, accuracy, power consumption, miniaturization, etc.) different from the conventional optical method Can be.

In addition, according to the embodiment, since the external environment does not affect the rain sensor, an additional correction sensor for the characteristic correction of the rain sensor is unnecessary, thereby reducing the cost.

In addition, according to the embodiment, it is possible to measure whether the rainfall and rainfall even by a slight change in the inductance of the carbon fine coil, it is possible to detect a low level of rainfall, by setting the reaction zone to avoid the foreign matter by the foreign matter The situation in which the wiper is driven can be prevented in advance.

According to an embodiment of the present invention, by additionally placing a floating electrode in the reaction layer in addition to the feed electrode, it is possible to maximize the capacitance value additionally generated during rain detection, thereby improving the rain water detection sensitivity.

In addition, according to an embodiment of the present invention, by minimizing the interval between the feed electrode and the floating electrode, or by extending the feed electrode and the floating electrode so as to have a square shape or a square spiral shape, to maximize the amount of change in the value of the capacitance It is possible to improve the rainwater detection sensitivity accordingly.

In addition, according to an embodiment of the present invention, by physically separating the reaction layer for embedding the negative electrode and the positive electrode, it is possible to minimize the signal interference generated between the negative electrode and the positive electrode, the signal-to-noise ratio accordingly Can improve.

Features, structures, effects, etc. described in the above embodiments are included in at least one embodiment, but are not necessarily limited to one embodiment. Furthermore, the features, structures, effects, and the like illustrated in the embodiments may be combined or modified with respect to other embodiments by those skilled in the art to which the embodiments belong. Therefore, it should be interpreted that the contents related to this combination and modification are included in the scope of the embodiments.

Although the above description has been made with reference to the embodiments, these are merely examples and are not intended to limit the embodiments, and those of ordinary skill in the art to which the embodiments pertain may have various examples that are not illustrated above without departing from the essential characteristics of the embodiments. It will be appreciated that eggplant modifications and applications are possible. For example, each component specifically shown in the embodiment can be modified. And differences relating to such modifications and applications will have to be construed as being included in the scope of the embodiments set forth in the appended claims.

Claims (11)

Board;
An electrode disposed on the substrate; And
A reaction layer disposed on the substrate to bury the electrode and include a carbon micro coil;
The electrode,
A first electrode portion having a positive polarity,
A second electrode portion having a negative polarity,
The first electrode unit,
A first feed electrode,
A first floating electrode spaced apart from the first feeding electrode at a predetermined interval,
The second electrode unit,
A second feed electrode,
And a second floating electrode spaced apart from the second feed electrode by a predetermined distance.
Sensing device. The method of claim 1,
A feed terminal and a ground terminal further disposed on the substrate;
The first feed electrode and the second feed electrode,
Connected to the feed terminal,
The first floating electrode and the second floating electrode,
Connected to the folding terminal
Sensing device. The method of claim 1,
The first feed electrode, the second feed electrode, the first floating electrode and the second floating electrode, respectively,
Disposed on the substrate a plurality of turns
Sensing device. The method of claim 1,
The reaction layer,
A first reaction layer disposed on the substrate and filling the first electrode part;
A second reaction layer disposed on the substrate and filling the second electrode part;
The first reaction layer,
Physically separated from the second reaction layer
Sensing device. The method of claim 4, wherein
A first partition wall part disposed on the substrate and surrounding the first reaction layer; And,
A second partition wall portion disposed on the substrate and surrounding the second reaction layer;
Sensing device. The method of claim 5,
The first partition wall portion,
Physically separated from the second partition wall
Sensing device. The method of claim 1,
A processing element disposed under the substrate and connected to the first and second feed electrodes;
Sensing device. The method of claim 7, wherein
The processing element,
A sensing unit connected to the first and second feed electrodes and outputting a sensing signal according to a change in capacitance value in the reaction layer transferred from the first and second feed electrodes;
And a control unit communicating with the electronic control unit of the vehicle to transmit the detection signal to the electronic control unit.
Sensing device. A sensor including a carbon fine coil and outputting a sensing signal according to a change in capacitance value formed by the carbon fine coil; And
A vehicle controller configured to receive a sensing signal output from the sensor and determine a wiper driving condition according to the received sensing signal,
The sensor,
Substrate,
An electrode disposed on the substrate and including a first electrode portion having a positive polarity, a second electrode portion having a negative polarity,
A reaction layer disposed on the substrate and filling the electrode, the reaction layer including the carbon fine coil;
The reaction layer,
A first reaction layer filling the first electrode part;
A second reaction layer buried in the second electrode part and physically separated from the first reaction layer;
Wiper drive The method of claim 9,
The sensor,
A processing element disposed under the substrate and connected to the first and second electrode portions;
The processing element,
A sensing unit connected to the first and second feed electrodes and outputting a sensing signal according to a change in capacitance value in the reaction layer transferred from the first and second electrode units;
A sensor controller configured to communicate with the vehicle controller to transmit the detection signal to the vehicle controller;
Wiper drive. The method of claim 10,
The sensing unit,
A first frequency generator for outputting a first frequency having an oscillation frequency corresponding to a change in capacitance value of the reaction layer;
A second frequency generator for outputting a second frequency corresponding to a preset reference oscillation frequency;
A difference frequency generator for outputting a difference value between the first frequency and the second frequency;
And a filter for filtering the difference value output through the difference frequency generator within a predetermined filtering region.
Wiper drive.

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