KR20090111211A - Rain sensor in grid structure with improved area detection efficiency - Google Patents

Rain sensor in grid structure with improved area detection efficiency Download PDF

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KR20090111211A
KR20090111211A KR1020080036853A KR20080036853A KR20090111211A KR 20090111211 A KR20090111211 A KR 20090111211A KR 1020080036853 A KR1020080036853 A KR 1020080036853A KR 20080036853 A KR20080036853 A KR 20080036853A KR 20090111211 A KR20090111211 A KR 20090111211A
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South Korea
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light
signal
receiving element
light source
detection device
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KR1020080036853A
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Korean (ko)
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KR101254131B1 (en
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한시연
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(주)에프에스씨
한시연
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Priority to KR1020080036853A priority Critical patent/KR101254131B1/en
Priority to CN2009801139150A priority patent/CN102015384B/en
Priority to EP09734320A priority patent/EP2277751A2/en
Priority to PCT/KR2009/001739 priority patent/WO2009131316A2/en
Priority to US12/988,428 priority patent/US8471513B2/en
Priority to JP2011506181A priority patent/JP5600313B2/en
Publication of KR20090111211A publication Critical patent/KR20090111211A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S1/00—Cleaning of vehicles
    • B60S1/02—Cleaning windscreens, windows or optical devices
    • B60S1/04—Wipers or the like, e.g. scrapers
    • B60S1/06—Wipers or the like, e.g. scrapers characterised by the drive
    • B60S1/08—Wipers or the like, e.g. scrapers characterised by the drive electrically driven
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
    • G01N21/3554—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for determining moisture content

Abstract

PURPOSE: A raindrop sensor in a grid structure with an extended area for detection is provided to minimize the effect of the ambient light and carry out an efficient raindrop sensing mode in the side of a detected area. CONSTITUTION: A raindrop sensor in a grid structure with an extended area for detection comprises a light source(5), a light receiving element(6), an infrared filter(3), and a receiver. The light source transmits signal beams according to the signals generated in a transmitter. The light receiving element is arranged by surrounding four light sources in the direction in which the light irradiated from the light source is reflected from the raindrop. The infrared filter is mounted in an opening-in-slit formed at one side of the case. The receiver raises the raindrop sensing probability by minimizing the effect due to external light.

Description

빗방울 감지영역을 넓힌 격자배열 방식 빗방울 감지 센서{Rain sensor in grid structure with improved area detection efficiency}Rain sensor in grid structure with improved area detection efficiency

본 발명은 격자 형태로 배열된 빗방울 감지 센서를 자동차의 전면 유리창에 부착하여 빗방울이 센서가 부착된 유리창에 떨어질 때 빗방울에서 광원 방향으로 반사되는 광량을 수신하여 빗방울 량을 인식하는 빗방울 감지 센서에 관한 것이다.The present invention relates to a raindrop detection sensor for attaching a raindrop detection sensor arranged in a grid form on the front windshield of the car to receive the amount of light reflected from the raindrop toward the light source when the raindrop falls on the glass window to which the sensor is attached. will be.

지금까지의 빗방울 감지 센서는 자동차의 전면 유리창에 신호 광을 주입하여 유리창에 빗방울이 떨어지면 유리창 내부를 따라 도파되던 광이 외부로 빠져나가 반대쪽에 설치된 수광소자에 도달하는 광량이 줄어들어 빗방울 낙하 정도를 판별하는 방식이나, 신호 광을 유리창에 비스듬히 입사시켜 유리창에 빗방울이 떨어지면 반사율에 변화가 일어나 반대쪽에 설치된 수광소자에 도달하는 광량이 변화되어 빗방울 낙하 정도를 판별하는 방식이나, 일렬로 배열된 빗방울 감지 센서를 자동차의 전면 유리창에 부착하여 빗방울이 센서가 부착된 유리창에 떨어질 때 빗방울에서 광원 방향으로 반사되는 광량을 수신하여 빗방울 량을 인식하는 방식을 사용하였 다. 이러한 방식 중 첫 번째 방식은 센서로 사용되는 신호 광을 자동차의 전면 유리창 내부로 도파되도록 입사시킬 때 광결합기를 자동차 전면 유리창과 완전히 밀착시키고 정확한 입사각을 유지시킬 필요가 있어서 광학계가 복잡해지고 설치가 어려운 단점이 있었다. 두 번째 방식은 센서로 사용되는 광원의 반대쪽에 수광소자를 설치하므로 빗방울에 의한 반사뿐만 아니라 자동차의 전면 유리창 표면에서 반사되는 반사광도 수광소자에 입사되어 신호대 잡음비가 저하되는 단점이 있었다, 세 번째 방식은 센서로 사용되는 광원과 수광소자 쌍을 일렬로 배치하므로 넓은 면적에 떨어지는 빗방울을 감지하기 위하여는 많은 수의 광원과 수광소자 쌍이 필요하여 광원 및 수광소자 쌍당 감지 면적이 협소한 단점이 있었다. Until now, the raindrop detection sensor injects the signal light into the windshield of the car, and when the raindrops fall on the windshield, the waveguided light exits through the inside of the windshield, and the amount of light reaching the light receiving element installed on the opposite side decreases to determine the degree of raindrop fall. If the raindrops fall on the glass window by inclining the signal light at an angle, the reflectance changes, and the amount of light reaching the light-receiving elements installed on the opposite side is changed to determine the degree of raindrop falling. Was attached to the front windshield of the car, and when the raindrops fell on the glass window to which the sensor was attached, it received the amount of light reflected from the raindrop toward the light source and used the method of recognizing the amount of raindrops. The first of these methods requires the optical coupler to be in close contact with the windshield of the car and to maintain an accurate angle of incidence when the signal light used as the sensor is incident to be guided into the inside of the windshield of the car. There was a downside. In the second method, since the light receiving device is installed on the opposite side of the light source used as the sensor, not only the reflection by raindrops but also the reflected light reflected from the surface of the front windshield of the vehicle is incident on the light receiving device, which lowers the signal-to-noise ratio. Since the light source and the light receiving element pairs used as sensors are arranged in a row, a large number of light source and light receiving element pairs are needed to detect raindrops falling on a large area, which has a disadvantage in that the detection area per light source and light receiving element pairs is narrow.

결국, 종래 기술에 의한 자동차 전면 유리창 내부 도파현상을 이용한 빗방울 감지 방식은 광학계가 복잡해지고 설치가 어려운 단점이 있었고, 광원과 수광소자를 서로 반대쪽에 위치시켜 빗방울에 의한 반사광을 측정하는 방식은 유리창 표면에서의 반사로 인하여 신호대 잡음비가 저하되는 단점이 있었고, 광원과 수광소자를 일렬로 배치하는 반사형 방식은 빗방울 감지면적이 협소한 단점이 있었다. As a result, the raindrop detection method using the waveguide inside the front windshield of the vehicle according to the prior art has a disadvantage in that the optical system is complicated and difficult to install, and the method of measuring the reflected light due to the raindrop by placing the light source and the light receiving device on the opposite side is a surface of the glass window. The signal-to-noise ratio was degraded due to the reflection at, and the reflection type arrangement in which the light source and the light receiving element were arranged in a row had a narrow raindrop detection area.

본 발명은 상기와 같은 문제점들을 해결하기 위하여 고안된 것으로서, 그 목적은 반사형 빗방울 감지방식에서 적은 수의 광원 및 수광소자를 사용하여 보다 더 넓은 면적에 걸쳐 효율적으로 빗방울을 감지하면서, 동시에 광학계를 간단히 하여 설치가 간편하고 자동차 전면 유리창 표면에서 반사되는 반사광의 영향을 받지 않으면서 변조된 신호 광을 사용하여 주변광의 영향을 최소화 시키고 빗방울 감지면적 측면에서 효율적인 빗방울 감지방식을 구현 하는데 있다.The present invention has been devised to solve the above problems, and its object is to detect raindrops efficiently over a larger area by using a small number of light sources and light-receiving elements in a reflective raindrop detection method, and at the same time, simply to detect an optical system. It is easy to install and minimizes the influence of ambient light by using modulated signal light without being affected by the reflected light reflected from the windshield surface of the car, and implements an effective raindrop detection method in terms of raindrop detection area.

상기와 같은 목적을 달성하기 위한 본 발명의 구성은 구체적으로, 우천시에 내리는 빗물을 감지하는 빗방울 감지 장치에 있어서, 송신기(11)에서 생성된 신호에 따라 신호광을 송출하는 광원(5)과, 단위 감지 구역에서 상기 광원(5)에서 조사된 광이 물방울에 반사되어 돌아오는 방향으로 4개의 광원(5)에 둘러싸여 배치되어 수신하는 수광소자(6)와, 빗방울 감지 센서 케이스(1)의 일측에 형성된 개구부인 슬릿에 장착되는 적외선 필터(3)와, 자동차 전면 유리창(2) 표면에서의 반사에 의한 잡음요소를 배제하면서도 신호광에 포함된 변조주파수 성분만을 추출하여 유리창 표면의 빗방울 존재량을 판단하므로 빗방울에 의한 반사성분이 아닌 외부 광에 의한 영향을 최소화시켜 빗방울 감지 확률을 높여주는 수신기(9)로 구성된 것을 특징으로 하며,Specifically, the configuration of the present invention for achieving the above object, in the raindrop detection device for detecting rainwater falling in rainy weather, the light source 5 for transmitting the signal light according to the signal generated by the transmitter 11, and the unit On one side of the light-receiving element 6 and the raindrop detection sensor case 1, which are disposed and received by being surrounded by four light sources 5 in a direction in which the light irradiated from the light source 5 is reflected by water droplets in the detection zone and returned to the water droplets. Since the presence of raindrops on the surface of the glass window is determined by extracting only the modulation frequency components included in the signal light while eliminating noise components caused by reflections from the surface of the vehicle windshield 2 and the infrared filter 3 mounted on the slit, which is the opening. It is characterized by consisting of a receiver (9) to increase the probability of detecting raindrops by minimizing the influence of external light, not the reflection component of raindrops,

상기 광원(5)에서 조사된 광이 물방울에 반사되어 돌아오는 방향으로 4개의 광원(5)에 둘러싸여 배치되어 수신하는 수광소자(6)로 구성된 단위 감지구역의 좌우 또는 상하로 격자 형태로 2개의 광원(5)과 1개의 수광소자(6)를 각각 추가 배치하여 감지구역을 확장하는 것을 특징으로 하고,The light emitted from the light source 5 is arranged in a grid shape to the left and right or up and down of the unit detection area composed of the light receiving elements 6 which are arranged and received by being surrounded by four light sources 5 in a return direction reflected by water droplets. The light source 5 and one light receiving element 6 are further arranged to extend the detection zone,

상기 광원(5)은 수광소자(6)와 격자 형태로 배치되며, 적외선 LED인 것을 특징으로 하고,The light source 5 is disposed in the form of a grid with the light receiving element 6, characterized in that the infrared LED,

상기 빗방울 감지 센서 케이스(1)의 내부에 빛을 흡수하는 검은 색과 난반사 처리가 된 것을 특징으로 하며,The raindrop detection sensor case 1 is characterized in that the black and diffuse reflection processing to absorb light,

상기 송신기(11)는 10kHz ~ 100kHz 대의 구형파를 발진하는 발진기(13)와 발진신호에 따라 적외선 LED 광원(5)을 광 변조시키는 변조기(14)로 구성된 것을 특징으로 하며, The transmitter 11 is characterized by consisting of an oscillator 13 for oscillating a square wave in the range of 10kHz ~ 100kHz and a modulator 14 for optically modulating the infrared LED light source 5 in accordance with the oscillation signal,

상기 수신기(9)는 수광소자(6)에서 광전변환된 전기신호를 증폭하는 증폭기(15)와, 상시 발진기(13)의 발진주파수와 동일한 주파수 성분만을 걸러내는 대역통과필터(16)로 구성된 것을 특징으로 하며,The receiver 9 comprises an amplifier 15 for amplifying an electrical signal photoelectrically converted by the light receiving element 6 and a band pass filter 16 for filtering only frequency components equal to the oscillation frequency of the oscillator 13. Features,

상기 수광소자(6) 전면에 장착된 적외선 필터(3)는 신호 광 이외의 가시광선 대역의 외부 광이 수신되는 것을 억제하는 것을 특징으로 하며,The infrared filter 3 mounted on the front of the light receiving element 6 is characterized in that it suppresses the reception of external light in the visible light band other than the signal light,

상기 수신기(9)는 신호 광의 크기에 따라 정보를 마이컴(10)에 전달하고, 마이컴(10)은 미리 입력된 대조표(Look-up Table)에 따라 적합한 자동차 유리창 브러시의 작동빈도를 결정하고 빗방울 감지 신호(12)를 출력하는 것을 특징으로 하는 주변 광 영향을 줄인 격자 배열 방식 빗방울 감지 장치로 구성된 것이다.The receiver 9 transmits information to the microcomputer 10 according to the magnitude of the signal light, and the microcomputer 10 determines an operating frequency of a suitable vehicle windshield brush according to a previously input look-up table and detects raindrops. It is composed of a lattice arrangement type raindrop detection device to reduce the ambient light effect, characterized in that to output a signal (12).

본 발명의 제 1 특징에 따르면, 빗방울 감지 센서에서 감지오차를 줄이기기 위하여 빗방울이 떨어지는 면적을 보다 더 넓게 감지하여 광원과 수광소자를 격자 형태로 배열하는 방식을 사용하고, 또한 자동차 전면 유리창 표면에서 반사되는 반사광의 영향을 받지 않게 하기 위하여 광원과 수광소자가 격자 형태로 부착된 감지판을 전면 유리창에 비스듬히 부착하는 방식을 사용하였다. 이때 광원에서 발사되는 특정주파수로 변조된 신호광이 빗방울에서 반사되어 격자 내에 위치한 수광소자에 입사되고 이렇게 수신된 광신호는 전기신호로 변환되어 변조할 때 사용된 특정주파수 성분만이 걸러져서 주변광의 영향을 최소화하고 이렇게 복원된 신호는 마이컴에서 미리 입력된 대조표와 비교하여 수신된 신호에 대응한 유리창 브러쉬 작동신호를 발생하게 하였다.According to the first aspect of the present invention, in order to reduce the detection error in the raindrop detection sensor using a method of arranging the light source and the light-receiving elements in a grid form by detecting a wider area falling raindrops, and also in the front windshield surface of the car In order not to be affected by the reflected reflected light, a method of attaching the detection plate attached to the light source and the light receiving element in a grid shape at an angle to the front glass window is used. At this time, the signal light modulated by the specific frequency emitted from the light source is reflected by the raindrops and is incident on the light-receiving element located in the grating. The received optical signal is converted into an electrical signal and only the specific frequency component used to modulate the effect of ambient light This reconstructed signal was generated in comparison with the pre-input table input from the microcomputer to generate the window brush operation signal corresponding to the received signal.

본 발명의 빗방울 감지 방식은 자동차의 유리창을 광도파로로 사용하는 감지 방식이나, 신호 광을 송출하는 광원과 수신하는 수광소자가 마주보도록 배치하는 방식이나, 광원과 수신하는 수광소자를 일렬로 같은 방향에 배치하는 방식과는 달리, 신호 광을 송출하는 광원들이 수신하는 수광소자를 둘러싸는 구조로 배치하여 자동차 유리창 표면에 떨어지는 빗방울을 보다 더 넓은 면적에 걸쳐 감지할 수 있어 빗방울 감지 확률을 높여주어 빗방울 감지 센서가 오동작 될 확률을 줄이는데 적합한 효과가 있다.The raindrop detection method of the present invention is a detection method using a window of an automobile as an optical waveguide, a method of arranging the light source for transmitting the signal light and the receiving light receiving element to face, or the light source and the receiving light receiving element in the same direction in a line Unlike the arrangement in which the light source transmitting the signal light is arranged in a structure surrounding the light receiving element receiving the light, raindrops falling on the surface of the car window can be detected over a larger area, thereby increasing the probability of detecting raindrops. This has the effect of reducing the probability of a malfunctioning sensor.

이하, 본 발명에 의한 격자 형태로 배열된 빗방울 감지 센서를 이용한 빗방울 감시 방식의 바람직한 실시 예를 첨부한 도면을 참조하여 상세히 설명한다.Hereinafter, with reference to the accompanying drawings a preferred embodiment of the raindrop monitoring method using a raindrop detection sensor arranged in a grid form according to the present invention will be described in detail.

첨부도면 도 1은 본 발명이 적용된 빗방울 감지 센서의 개념도와 전면 유리창 표면에 광원과 수광소자가 격자 형태로 부착된 감지판을 전면 유리창에 비스듬히 부착하는 방식의 개념도 이고, 도 2는 센서 내 주변광 영향 감소방식의 개념도 이다.1 is a conceptual diagram of a raindrop detection sensor to which the present invention is applied and a sensing plate having a light source and a light receiving element attached to the front glass window at an angle to the front glass window at an angle, and FIG. 2 is an ambient light in the sensor. A conceptual diagram of impact reduction.

도 1을 참조하면, 참조번호 1은 본 발명에 의한 빗방울 감지센서 외함을 나타내고, 참조번호 2는 자동차 전면 유리창을 나타내고, 참조번호 3은 적외선 통과 필터를 나타내고, 참조번호 4는 광원과 수광소자를 격자 모양으로 배열시켜 부착시키는 격자판을 나타내고, 참조번호 5는 광원으로 사용되는 LED를 나타내고, 참조번호 6은 수신된 광 신호를 전기신호로 바꾸기 위한 수광소자를 나타내고, 참조번호 7은 격자판을 고정시키는 브라켓을 나타내고, 참조번호 8은 유리창 표면에 떨어진 빗방울을 나타낸다. Referring to FIG. 1, reference numeral 1 denotes a raindrop detection sensor enclosure according to the present invention, reference numeral 2 denotes a vehicle front windshield, reference numeral 3 denotes an infrared pass filter, and reference numeral 4 denotes a light source and a light receiving element. A grid plate arranged in a grid shape and attached thereto, reference numeral 5 denotes an LED used as a light source, reference numeral 6 denotes a light receiving element for converting a received optical signal into an electrical signal, and reference numeral 7 denotes a grid plate for fixing the grid plate. The brackets are shown and reference numeral 8 denotes raindrops falling on the glass window surface.

상기의 구성에서 광원으로 사용되는 LED(5)로부터 출력되는 적외선 신호광은 적외선 통과 필터(3)와 자동차 전면 유리창(2)을 통과하여 유리창 표면에 부착된 빗방울(8)에서 일부가 반사되어 다시 자동차 전면 유리창(2)과 적외선 통과 필터(3)를 통과한 후 LED(5)와 같은 방향에 위치한 수광소자(6)에서 광전변환 된다. 이렇게 광전변환된 전기신호는 수신기에서 신호로 복원된 후 마이컴에 미리 입력된 대조표와 비교하여 수신된 신호에 대응한 유리창 브러쉬 작동신호를 발생하게 된 다. 이때 1 단위감지구역에서는 광원으로 사용되는 4 개의 LED(5)가 1 개의 수광소자(6)를 둘러싸는 구조이므로 1 개의 수광소자(6)로 4 개의 경로를 포함시킬 수 있으므로 수광소자 개수 측면에서 경제적이다. 더욱이 인접 감지구역에서는 2 개의 LED(5)와 1 개의 수광소자(6)를 추가하여도 처음 감지구역에서와 같이 4개의 LED(5)를 사용하는 효과를 거두므로 감지면적은 넓히면서 부품수를 줄일 수 있는 장점이 있다. The infrared signal light output from the LED 5 used as the light source in the above configuration passes through the infrared pass filter 3 and the front windshield 2 of the vehicle and is partially reflected by the raindrop 8 attached to the surface of the windshield. After passing through the front glass (2) and the infrared filter (3) is photoelectric conversion in the light receiving element (6) located in the same direction as the LED (5). The photoelectrically converted electrical signal is restored to a signal at the receiver and then compared with a control table previously input to the microcomputer to generate a window brush operation signal corresponding to the received signal. In this case, since the four LEDs 5 used as the light sources surround one light receiving element 6 in one unit detection area, four light paths may be included as one light receiving element 6, so It is economical. In addition, the addition of two LEDs (5) and one light-receiving element (6) in the adjacent sensing zone has the effect of using four LEDs (5) as in the first sensing zone, thus increasing the sensing area and reducing the number of parts. There are advantages to it.

한편, 도 2를 참조하면, 참조번호 9는 수신기를 나타내고, 참조번호 10은 마이컴을 나타내고, 참조번호 11은 송신기를 나타내고, 참조번호 12는 유리창 브러쉬를 작동시키는 빗방울 감지신호를 나타내고, 참조번호 13은 광원을 변조시키는 발진주파수를 생성하는 발진기를 나타내고, 참조번호 14는 변조기를 나타내고, 참조번호 15는 수광소자에서 광전변환된 신호를 증폭하는 증폭기를 나타내고, 참조번호 16은 증폭기 출력에 포함된 신호중에서 당초 송신기에 사용된 변조주파수와 같은 주파수 성분만을 추출하는 대역통과필터를 나타낸다. Meanwhile, referring to FIG. 2, reference numeral 9 denotes a receiver, reference numeral 10 denotes a microcomputer, reference numeral 11 denotes a transmitter, reference numeral 12 denotes a raindrop detection signal for operating a window brush, and reference numeral 13 Denotes an oscillator for generating an oscillation frequency for modulating the light source, reference numeral 14 denotes a modulator, reference numeral 15 denotes an amplifier for amplifying a photoelectrically converted signal in the light receiving element, and reference numeral 16 denotes a signal included in the amplifier output. The bandpass filter extracts only the frequency components such as the modulation frequency used in the transmitter initially.

상기의 구성에서 발진기(13)는 10kHz ~ 100kHz 대의 정현파를 발진하고 이 발진신호에 따라 변조기(14)는 LED(5)를 광변조시킨다. 이렇게 생성된 신호광은 자동차 전면 유리창(2)에 떨어진 빗방울(8)에서 반사되어 자동차 전면 유리창에 부착된 적외선통과필터(3)를 통과한 후 수광소자(6)에 수신된다. 이때 적외선통과필터(3)는 신호광 이외의 가시광선 대역의 외부광이 수신되는 것을 억제하는 효과를 가져온다. 수광소자에서 광전변환된 전기신호는 증폭기(15)에서 증폭된 후 대역통과필터(16)에서 당초 발진기(13)의 발진주파수와 동일한 주파수 성분만을 걸러내게 된다. 이러한 방법으로 신호광 이외의 외부광의 영향을 대부분 차단할 수 있게 된다. 이렇게 생성된 신호광의 크기는 마이컴에서 미리 입력된 대조표(Look-up Table)에 따라 적합한 자동차 유리창 브러쉬의 작동빈도를 결정하고 이를 출력(12)하도록 하였다. In the above configuration, the oscillator 13 oscillates a sine wave in the range of 10 kHz to 100 kHz, and the modulator 14 light modulates the LED 5 according to the oscillation signal. The generated signal light is reflected by the raindrops 8 falling on the front windshield 2 of the vehicle and passed through the infrared light passing filter 3 attached to the front windshield of the vehicle, and then received by the light receiving element 6. At this time, the infrared filter 3 has an effect of suppressing the reception of external light in the visible light band other than the signal light. The electrical signal photoelectrically converted by the light receiving element is amplified by the amplifier 15 and then, in the band pass filter 16, filters out only frequency components equal to the oscillation frequency of the oscillator 13 at first. In this way, it is possible to block most of the influence of external light other than the signal light. The size of the signal light generated in this way is to determine the operation frequency of the suitable vehicle windshield brush according to a look-up table input in advance from the microcomputer and to output it.

도 1은 본 발명에 의한 빗방울 감지 센서의 개념도,1 is a conceptual diagram of a raindrop detection sensor according to the present invention,

도 2는 본 발명에 의한 센서 내 주변광 영향 감소방식의 개념도.Figure 2 is a conceptual diagram of the ambient light effect reduction method in the sensor according to the present invention.

Claims (8)

우천시에 내리는 빗물을 감지하는 빗방울 감지장치에 있어서, 송신기(11)에서 생성된 신호에 따라 신호광을 송출하는 광원(5)과, 단위 감지 구역에서 상기 광원(5)에서 조사된 광이 물방울에 반사되어 돌아오는 방향으로 4개의 광원(5)에 둘러싸여 배치되어 수신하는 수광소자(6)와, 빗방울 감지센서 케이스의 일측에 형성된 개구부 인 슬릿에 장착되는 적외선 필터(3)와, 자동차 전면 유리창(2) 표면에서의 반사에 의한 잡음요소를 배제하면서도 신호광에 포함된 변조주파수 성분만을 추출하여 유리창 표면의 빗방울 존재량을 판단하므로 빗방울에 의한 반사성분이 아닌 외부 광에 의한 영향을 최소화시켜 빗방울 감지 확률을 높여주는 수신기(9)로 구성된 것을 특징으로 하는 주변 광 영향을 줄인 격자 배열 방식 빗방울 감지 장치.A raindrop detection device for detecting rainwater falling in rainy weather, comprising: a light source (5) for transmitting signal light according to a signal generated by the transmitter (11), and the light irradiated from the light source (5) in a unit detection zone is reflected on water droplets And a light receiving element 6 arranged and surrounded by four light sources 5 in a returning direction, an infrared filter 3 mounted to a slit opening part formed at one side of the raindrop sensor case, and a front windshield window 2 of the vehicle. ) Excludes noise components caused by reflections on the surface, and extracts only the modulation frequency components included in the signal light to determine the amount of raindrops on the surface of the glass window, thereby minimizing the influence of external light instead of reflections caused by raindrops. A lattice arrangement type raindrop detection device with reduced ambient light effect, characterized in that consisting of a receiver (9) to increase. 제 1항에 있어서,The method of claim 1, 상기 광원(5)에서 조사된 광이 물방울에 반사되어 돌아오는 방향으로 4개의 광원(5)에 둘러싸여 배치되어 수신하는 수광소자(6)로 구성된 단위 감지구역의 좌우 또는 상하로 격자 형태로 2개의 광원(5)과 1개의 수광소자(6)를 각각 추가 배치하여 감지구역을 확장하는 것을 특징으로 하는 주변 광 영향을 줄인 격자 배열 방식 빗방울 감지 장치.The light emitted from the light source 5 is arranged in a grid shape to the left and right or up and down of the unit detection area composed of the light receiving elements 6 which are arranged and received by being surrounded by four light sources 5 in a return direction reflected by water droplets. A lattice arrangement type raindrop detection device for reducing the influence of ambient light, characterized in that the light source (5) and one light receiving element (6) are additionally arranged to extend the detection zone. 제 1항에 있어서,The method of claim 1, 상기 광원(5)은 수광소자(6)와 격자 형태로 배치되며, 적외선 LED인 것을 특징으로 하는 주변 광 영향을 줄인 격자 배열 방식 빗방울 감지 장치.The light source (5) is arranged in the form of a lattice with the light receiving element (6), lattice arrangement type raindrop detection device to reduce the influence of ambient light, characterized in that the infrared LED. 제 1항에 있어서,The method of claim 1, 상기 빗방울 감지 센서 케이스(1)의 내부에 빛을 흡수하는 검은 색과 난반사 처리가 된 것을 특징으로 하는 주변 광 영향을 줄인 격자 배열 방식 빗방울 감지 장치.The raindrop detection sensor case (1) in the grid array type raindrop detection device to reduce the influence of ambient light, characterized in that the black and the diffuse reflection processing to absorb light. 제 1항에 있어서,The method of claim 1, 상기 송신기(11)는 10kHz ~ 100kHz 대의 구형파를 발진하는 발진기(13)와 발진신호에 따라 적외선 LED 광원(5)을 광 변조시키는 변조기(14)로 구성된 것을 특징으로 하는 주변 광 영향을 줄인 격자 배열 방식 빗방울 감지 장치.The transmitter 11 comprises a lattice arrangement with reduced ambient light effects, comprising an oscillator 13 for oscillating a square wave in the range of 10 kHz to 100 kHz and a modulator 14 for modulating the infrared LED light source 5 according to the oscillation signal. Raindrop detection device. 제 5항에 있어서,The method of claim 5, 상기 수신기(9)는 수광소자(6)에서 광전변환된 전기신호를 증폭하는 증폭기(15)와, 상시 발진기(13)의 발진주파수와 동일한 주파수 성분만을 걸러내는 대역통과필터(16)로 구성된 것을 특징으로 하는 주변 광 영향을 줄인 격자 배열 방식 빗방울 감지 장치.The receiver 9 comprises an amplifier 15 for amplifying an electrical signal photoelectrically converted by the light receiving element 6 and a band pass filter 16 for filtering only frequency components equal to the oscillation frequency of the oscillator 13. A grid array raindrop detection device that reduces the influence of ambient light. 제 6항에 있어서,The method of claim 6, 상기 수광소자(6) 전면에 장착된 적외선 필터(3)는 신호 광 이외의 가시광선 대역의 외부 광이 수신되는 것을 억제하는 것을 특징으로 하는 주변 광 영향을 줄인 격자 배열 방식 빗방울 감지 장치.The infrared filter (3) mounted on the front of the light receiving element (6) is a grid array raindrop detection device to reduce the influence of ambient light, characterized in that to suppress the reception of external light in the visible light band other than the signal light. 제 1항 내지 제 7항 중 어느 한 항에 있어서,The method according to any one of claims 1 to 7, 상기 수신기(9)는 신호 광의 크기에 따라 정보를 마이컴(10)에 전달하고, 마이컴(10)은 미리 입력된 대조표(Look-up Table)에 따라 적합한 자동차 유리창 브러시의 작동빈도를 결정하고 빗방울 감지 신호(12)를 출력하는 것을 특징으로 하는 주변 광 영향을 줄인 격자 배열 방식 빗방울 감지 장치.The receiver 9 transmits information to the microcomputer 10 according to the magnitude of the signal light, and the microcomputer 10 determines an operating frequency of a suitable vehicle windshield brush according to a previously input look-up table and detects raindrops. A lattice arrangement type raindrop detection device which reduces the influence of ambient light, characterized by outputting a signal (12).
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KR100981196B1 (en) * 2008-07-23 2010-09-10 한국오므론전장주식회사 Prism mediated type rain sensor
KR20150040353A (en) * 2012-08-09 2015-04-14 해롤드 러셀 베이어드 Reflective material sensor

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KR101856937B1 (en) 2016-10-14 2018-06-19 현대자동차주식회사 Rain sensor of vehicle, and method of controlling the same
KR101984866B1 (en) 2018-03-19 2019-05-31 울산과학기술원 Sensor using self-powered source and method of manufacturing the sensor

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JP2007278711A (en) 2006-04-03 2007-10-25 Tgk Co Ltd Raindrop sensor
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KR100981196B1 (en) * 2008-07-23 2010-09-10 한국오므론전장주식회사 Prism mediated type rain sensor
KR20150040353A (en) * 2012-08-09 2015-04-14 해롤드 러셀 베이어드 Reflective material sensor

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