JPH10253602A - Raindrop detecting device - Google Patents
Raindrop detecting deviceInfo
- Publication number
- JPH10253602A JPH10253602A JP9053538A JP5353897A JPH10253602A JP H10253602 A JPH10253602 A JP H10253602A JP 9053538 A JP9053538 A JP 9053538A JP 5353897 A JP5353897 A JP 5353897A JP H10253602 A JPH10253602 A JP H10253602A
- Authority
- JP
- Japan
- Prior art keywords
- raindrop
- receiving element
- microcomputer
- change amount
- amplitude
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/11—Analysing solids by measuring attenuation of acoustic waves
-
- 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
- B60S1/0818—Wipers or the like, e.g. scrapers characterised by the drive electrically driven including control systems responsive to external conditions, e.g. by detection of moisture, dirt or the like
-
- 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
- B60S1/0818—Wipers or the like, e.g. scrapers characterised by the drive electrically driven including control systems responsive to external conditions, e.g. by detection of moisture, dirt or the like
- B60S1/0822—Wipers or the like, e.g. scrapers characterised by the drive electrically driven including control systems responsive to external conditions, e.g. by detection of moisture, dirt or the like characterized by the arrangement or type of detection means
- B60S1/0855—Ultrasonic rain sensor
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B11/00—Transmission systems employing sonic, ultrasonic or infrasonic waves
-
- 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
- B60S1/0818—Wipers or the like, e.g. scrapers characterised by the drive electrically driven including control systems responsive to external conditions, e.g. by detection of moisture, dirt or the like
- B60S1/0822—Wipers or the like, e.g. scrapers characterised by the drive electrically driven including control systems responsive to external conditions, e.g. by detection of moisture, dirt or the like characterized by the arrangement or type of detection means
- B60S1/0833—Optical rain sensor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/024—Mixtures
- G01N2291/02441—Liquids in porous solids
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/025—Change of phase or condition
- G01N2291/0253—Condensation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/02845—Humidity, wetness
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/04—Wave modes and trajectories
- G01N2291/042—Wave modes
- G01N2291/0423—Surface waves, e.g. Rayleigh waves, Love waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/10—Number of transducers
- G01N2291/102—Number of transducers one emitter, one receiver
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Automation & Control Theory (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Acoustics & Sound (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は主にプレート部材上
に付着した雨滴を検出する雨滴検出装置に関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a raindrop detector for detecting raindrops attached to a plate member.
【０００２】[0002]
【従来の技術】従来の雨滴検出装置としては、特開平４
−７８６４１号に記載されたものがある。2. Description of the Related Art A conventional raindrop detecting device is disclosed in
-78641.
【０００３】これには、図４に示すように、車両のフロ
ントウィンドウガラスの下部に、共に圧電素子によって
形成された送波素子５１の送波面と受波素子５３の受波
面とが、互いに向かい合った位置になるように設置され
ている雨滴検出装置が開示されている。[0003] As shown in FIG. 4, a transmitting surface of a transmitting element 51 and a receiving surface of a receiving element 53, both formed by piezoelectric elements, face each other below a windshield of a vehicle. There is disclosed a raindrop detection device that is installed at a different position.
【０００４】この雨滴検出装置においては、図５に示す
ように、通常、雨滴の存在しない場合、送波素子５１に
よって発生され、フロントウィンドウガラス上を直進し
た大きな弾性波が、送波素子５１の送波面と向かい合っ
た位置に受波面がある受波素子５３によって受波される
のであるが、フロントウィンドウガラス上に雨滴が存在
する場合、送波素子５１によって発生された弾性波が、
雨滴に当たることによって乱反射し、結果的に受波素子
５３によって受波される弾性波が小さくなり、フロント
ウィンドウガラス上に雨滴が存在することを検出してい
る。この時、雨滴の付着位置によって受波素子に至る弾
性波の経路が変わり、受波面において波の干渉が起こ
る。In this raindrop detecting device, as shown in FIG. 5, when there is no raindrop, a large elastic wave generated by the wave transmitting element 51 and traveling straight on the front window glass is normally generated by the wave transmitting element 51. Although the wave is received by the wave receiving element 53 having the wave receiving surface at a position facing the wave transmitting surface, when raindrops are present on the windshield, the elastic wave generated by the wave transmitting element 51 is
The elastic wave that is irregularly reflected by hitting the raindrop and consequently the elastic wave received by the wave receiving element 53 is reduced, and the presence of the raindrop on the windshield is detected. At this time, the path of the elastic wave reaching the wave receiving element changes depending on the position where the raindrop is attached, and wave interference occurs on the wave receiving surface.
【０００５】従って、上記雨滴検出装置では、送波素子
５１と、これと向かい合った位置にある受波素子５３と
を結んだ直線上付近にある雨滴だけしか検出できず、雨
滴の検出領域が狭いという問題があった。Therefore, in the above-mentioned raindrop detecting device, only the raindrop near the straight line connecting the wave transmitting element 51 and the wave receiving element 53 located opposite thereto can be detected, and the raindrop detecting area is narrow. There was a problem.
【０００６】ここで、図６に示すように、送波素子５５
の送波面に対して受波素子５７の受波面が、所定角度を
成すように設置した雨滴検出装置が考えられる。これ
は、図７に示すように、通常、雨滴の存在しない場合、
送波素子５５によって発生され、フロントウィンドウガ
ラス上を直進した大きな弾性波は、受波素子５７には直
接には入波されず、フロントウィンドウガラス上に雨滴
が存在する場合、送波素子５５によって発生された弾性
波が、雨滴に当たることによって乱反射することによっ
て、受波素子５７に入波され、受波素子５７によって受
波される弾性波の大きさに変化があらわれ、フロントウ
ィンドウガラス上に雨滴が存在することを検出してい
る。[0006] Here, as shown in FIG.
A raindrop detecting device is conceivable in which the wave receiving surface of the wave receiving element 57 is installed at a predetermined angle with respect to the wave transmitting surface. This is usually the case when there is no raindrop, as shown in FIG.
The large elastic wave generated by the wave transmitting element 55 and traveling straight on the windshield is not directly incident on the wave receiving element 57, and when a raindrop exists on the windshield, the large elastic wave is transmitted by the wave transmitting element 55. The generated elastic wave is irregularly reflected by hitting a raindrop, and is incident on the wave receiving element 57, and the magnitude of the elastic wave received by the wave receiving element 57 changes, and the raindrop is displayed on the windshield. Has been detected.
【０００７】従って、図６に示す雨滴検出装置において
は、フロントウィンドウガラス上にある雨滴によって、
受波素子５７によって受波される弾性波による信号電圧
が、図７にあるように大きくなる場合も、小さくなる場
合も考えられ、従来の受波素子によって受波される弾性
波が小さくなることを検知する方法では、雨滴を検出す
ることができない。Therefore, in the raindrop detecting device shown in FIG. 6, the raindrop on the windshield causes
The signal voltage due to the elastic wave received by the receiving element 57 may increase or decrease as shown in FIG. 7, and the elastic wave received by the conventional receiving element may decrease. Cannot detect raindrops.
【０００８】[0008]
【発明が解決しようとする課題】本発明は、前述した従
来技術の不具合を解消させることを解決すべき課題とす
る。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned disadvantages of the prior art.
【０００９】[0009]
【課題を解決するための手段】本発明の請求項１は、前
述の課題を解決するために、プレート部材上に設置さ
れ、該プレート部材に対し弾性波を放射する送信素子
と、前記プレート部材上に設置され、前記送信素子から
の弾性波が入力される受信素子とを備え、前記送信素子
と前記受信素子とを結ぶ直線に対して、前記送信素子、
又は、前記受信素子のいずれか一方を傾けて配置し、更
に、該受信素子に連結され、前記弾性波の振幅の変化量
を演算する振幅変化量演算手段と、前記振幅変化量演算
手段が演算した振幅の変化量が、所定値より大きい場合
に雨滴が存在すると判断する雨滴判定手段とからなる雨
滴検出装置とした。According to a first aspect of the present invention, there is provided a transmitting element installed on a plate member for radiating an elastic wave to the plate member. A receiving element to which an elastic wave from the transmitting element is input, and a transmitting element connecting to the transmitting element and the receiving element,
Alternatively, one of the receiving elements is arranged at an angle, and further connected to the receiving element, the amplitude change amount calculating means for calculating the change amount of the amplitude of the elastic wave, and the amplitude change amount calculating means are calculated. A raindrop detecting device comprising a raindrop determining means for determining that a raindrop is present when the change amount of the amplitude is larger than a predetermined value.
【００１０】上記請求項１に記載した手段による雨滴検
出装置によれば、振幅変化量演算手段が弾性波の振幅の
変化量を演算し、振幅変化量演算手段が演算した振幅の
変化量が、所定値より大きい場合に、雨滴判定手段が雨
滴が存在すると判断する。According to the raindrop detecting device of the first aspect, the amplitude change amount calculating means calculates the change amount of the amplitude of the elastic wave, and the amplitude change amount calculated by the amplitude change amount calculating means is: If it is larger than the predetermined value, the raindrop determining means determines that raindrops are present.
【００１１】本発明の請求項２は前述の課題を解決する
ために、前記雨滴判定手段は、前記振幅変化量演算手段
が演算した振幅の変化量が、所定数回以上連続して所定
値より大きい場合に雨滴が存在すると判断することを特
徴とする請求項１を満足する雨滴検出装置とした。According to a second aspect of the present invention, in order to solve the above-mentioned problem, the raindrop determining means determines that the amplitude change amount calculated by the amplitude change amount calculating means continuously exceeds a predetermined value several times or more. A raindrop detecting device that satisfies claim 1 is characterized in that it is determined that a raindrop is present when it is large.
【００１２】上記請求項２に記載した手段による雨滴検
出装置によれば、雨滴判定手段が振幅変化量演算手段が
演算した振幅の変化量が、所定数回以上連続して所定値
より大きい場合に雨滴が存在すると判断するため、所定
量以上の雨滴を検出できる。本発明の請求項３は、前述
の課題を解決するために、更に、前記雨滴判定手段が雨
滴が存在すると判断した場合に、車両のワイパーを作動
させるワイパー作動制御手段を備えたことを特徴とする
請求項２を満足する雨滴検出装置とした。[0012] According to the raindrop detecting device of the second aspect, when the amount of change in the amplitude calculated by the amplitude change amount calculating means by the raindrop determining means is continuously larger than a predetermined value for a predetermined number of times or more. Since it is determined that raindrops are present, it is possible to detect raindrops of a predetermined amount or more. Claim 3 of the present invention, in order to solve the above-mentioned problem, further comprises a wiper operation control means for operating a wiper of the vehicle when the raindrop determination means determines that raindrops are present. A raindrop detector that satisfies claim 2 is provided.
【００１３】上記請求項３に記載した手段による雨滴検
出装置によれば、雨滴判定手段が雨滴が存在すると判断
した場合に、車両のワイパーを作動させ、例えば、フロ
ントウィンドウガラス上の雨滴を払拭することができ
る。According to the raindrop detecting device of the third aspect, when the raindrop determining means determines that raindrops exist, the wiper of the vehicle is actuated, for example, to wipe off the raindrops on the windshield. be able to.
【００１４】本発明の請求項４は、前述の課題を解決す
るために、前記雨滴判定手段は、前記振幅変化量演算手
段が演算した振幅の変化量が、所定値より大きい状態が
所定数回以上連続していた時間が、所定時間より短い場
合に、車両のワイパーを高速で作動させることを特徴と
する請求項３を満足する雨滴検出装置とした。According to a fourth aspect of the present invention, in order to solve the above-mentioned problem, the raindrop determining means determines that the amplitude change amount calculated by the amplitude change amount calculating means is larger than a predetermined value a predetermined number of times. When the continuous time is shorter than a predetermined time, the wiper of the vehicle is operated at a high speed.
【００１５】上記請求項４に記載した手段による雨滴検
出装置によれば、豪雨時のように、短時間で大量の雨滴
が検出される場合に、車両のワイパーを高速で作動させ
ることができる。According to the raindrop detecting device according to the fourth aspect, the wiper of the vehicle can be operated at high speed when a large amount of raindrops are detected in a short time, such as during heavy rain.
【００１６】[0016]
【発明の実施の形態】以下、図面を用いて本発明の特徴
を示す部分のみについて説明する。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing the configuration of a preferred embodiment of the present invention.
【００１７】図１は、本発明による雨滴検出装置の概念
図である。図１において、１は図示しない車両のボディ
に、図示しないモールを介して固定されたフロントウィ
ンドウ用のフロントガラスであり、フロントガラス１
の、敢えて限定する意図はないが、裏側（車室内側）に
は例えば、圧電素子によって形成され、フロントガラス
１に弾性波を送波する送信素子３と、送信素子３と所定
の間隔をもって配置された受信素子５とが、それぞれ送
信素子用カプラー７，受信素子用カプラー９を介して添
付されている。FIG. 1 is a conceptual diagram of a raindrop detecting device according to the present invention. In FIG. 1, reference numeral 1 denotes a windshield for a front window fixed to a body of a vehicle (not shown) via a molding (not shown).
Although there is no intention to limit the transmission, a transmission element 3 formed of, for example, a piezoelectric element for transmitting an elastic wave to the windshield 1 and disposed at a predetermined distance from the rear side (inside the vehicle compartment). The received receiving element 5 is attached via a transmitting element coupler 7 and a receiving element coupler 9, respectively.
【００１８】図から明らかな通り、送信素子３の弾性波
の送信方向と、受信素子５の受信方向は、互いに一直線
上にはなく、所定の角度を成すように設置されている。As is apparent from the drawing, the transmitting direction of the elastic wave of the transmitting element 3 and the receiving direction of the receiving element 5 are not linear with each other, but are arranged so as to form a predetermined angle.
【００１９】送信素子３には発振器１１が接続され、所
定の周波数の電圧が印加され得る。一方、受信素子５に
はプリアンプ１３が接続され、受信素子５によって弾性
波の振幅に応じて変換された信号電圧を、信号処理可能
な所定の信号レベルまで増幅する。An oscillator 11 is connected to the transmitting element 3, and a voltage of a predetermined frequency can be applied. On the other hand, a preamplifier 13 is connected to the receiving element 5, and amplifies the signal voltage converted by the receiving element 5 according to the amplitude of the elastic wave to a predetermined signal level that can be processed.
【００２０】プリアンプ１３には、プリアンプ１３から
の信号のうち、所定の周波数信号のみを通過させるフィ
ルタ回路１５が接続され、更に、フィルタ回路１５には
対数アンプ１７が接続され、フィルタ回路１５からの信
号を圧縮して、後述するマイクロコンピューター２１が
扱いやすい信号レベルに変換している。The preamplifier 13 is connected to a filter circuit 15 that allows only a predetermined frequency signal of the signals from the preamplifier 13 to pass therethrough. The signal is compressed and converted into a signal level that can be easily handled by a microcomputer 21 described later.
【００２１】対数アンプ１７には、マイクロコンピュー
ター２１が、Ａ／Ｄコンバータ１９を介して接続され、
対数アンプ１７からのアナログ信号が、Ａ／Ｄコンバー
タ１９によってデジタル信号化された後、マイクロコン
ピューター２１に入力されている。A microcomputer 21 is connected to the logarithmic amplifier 17 via an A / D converter 19.
An analog signal from the logarithmic amplifier 17 is converted into a digital signal by the A / D converter 19 and then input to the microcomputer 21.
【００２２】ワイパ制御装置２３は、マイクロコンピュ
ーター２１に接続され、マイクロコンピューター２１が
フロントガラス１上に雨滴があると判断した場合に、図
示しない車両のフロントワイパユニットの、ワイパ駆動
モータに電力を供給し、図示しないフロントワイパを作
動させる。The wiper control device 23 is connected to the microcomputer 21 and supplies power to a wiper drive motor of a front wiper unit (not shown) of the vehicle when the microcomputer 21 determines that raindrops are present on the windshield 1. Then, a front wiper (not shown) is operated.
【００２３】次に、図２に基づいて、本発明の雨滴検出
装置の作動について説明する。ステップＳ１において、
例えば、図示しない車両のイグニッションスイッチが起
動され、マイクロコンピュータ２１に電力が供給される
と、マイクロコンピュータ２１は初期化され、マイクロ
コンピュータ２１のレジスタ内のデータＮ、及び、タイ
マーＴをクリアする（ステップＳ３）。Next, the operation of the raindrop detecting device of the present invention will be described with reference to FIG. In step S1,
For example, when an ignition switch of a vehicle (not shown) is activated and power is supplied to the microcomputer 21, the microcomputer 21 is initialized, and clears the data N in the register of the microcomputer 21 and the timer T (step S3).
【００２４】ステップＳ５において、タイマーＴの値が
信号電圧サンプリング間隔の倍数であると判断された場
合、ステップＳ７へと進む。If it is determined in step S5 that the value of the timer T is a multiple of the signal voltage sampling interval, the process proceeds to step S7.
【００２５】前記した送信素子３によって発生させられ
た弾性波は、フロントガラス１上を伝播し、受信素子５
によって受信される。受信素子５によって受信された弾
性波は、受信素子５によって電気信号に変換され、Ａ／
Ｄコンバータ１９によってデジタル信号Ｖn に変換され
た後、マイクロコンピュータ２１に入力される（ステッ
プＳ７）。The elastic wave generated by the transmitting element 3 propagates on the windshield 1 and
Received by The elastic wave received by the receiving element 5 is converted into an electric signal by the receiving element 5 and A / A
After being converted into a digital signal V n D converter 19, is input to microcomputer 21 (step S7).
【００２６】ステップＳ９において、デジタル信号Ｖn
から、前回のデジタル信号の入力値Ｖn-1 を減算した値
ΔＶが演算される。In step S9, the digital signal V n
, A value ΔV obtained by subtracting the previous input value V n-1 of the digital signal is calculated.
【００２７】ステップＳ１１において、減算値ΔＶの絶
対値が所定値Ａ以上である場合、送信素子３からの弾性
波が、フロンドガラス１上にある雨滴によって乱反射し
た結果、受信素子５からの信号電圧が変化したとして、
ステップＳ１３へと進み、マイクロコンピュータ２１の
レジスタ内のデータＮを更新する。In step S11, when the absolute value of the subtraction value ΔV is equal to or larger than the predetermined value A, the elastic wave from the transmitting element 3 is irregularly reflected by raindrops on the front glass 1 and the signal voltage from the receiving element 5 Has changed,
Proceeding to step S13, the data N in the register of the microcomputer 21 is updated.
【００２８】ステップＳ１１において、減算値ΔＶの絶
対値が所定値Ａより小さい場合、ステップＳ５へと戻
り、データＮの更新は行わない。If the absolute value of the subtraction value ΔV is smaller than the predetermined value A in step S11, the process returns to step S5, and the data N is not updated.
【００２９】ステップＳ１５において、マイクロコンピ
ュータ２１のレジスタ内のデータＮが所定値Ｂ以上であ
る場合、フロントガラス１上に所定量の雨滴があると判
断して、ステップＳ１７へと進み、タイマーＴの値が所
定値ＴHL以上であるかどうかの判断が行われる。In step S15, if the data N in the register of the microcomputer 21 is equal to or larger than the predetermined value B, it is determined that a predetermined amount of raindrops are present on the windshield 1, and the process proceeds to step S17, where the timer T A determination is made whether the value is greater than or equal to a predetermined value THL .
【００３０】ステップＳ１７において、タイマーＴの値
が所定値ＴHLより小さい場合、ステップＳ１９へと進
み、マイクロコンピュータ２１はワイパ制御装置２３に
ワイパの高速払拭信号を発信し、図示しない車両のフロ
ントワイパを高速にて作動させる。In step S17, if the value of the timer T is smaller than the predetermined value THL , the process proceeds to step S19, where the microcomputer 21 sends a high-speed wiping signal of the wiper to the wiper control device 23, and the front wiper of the vehicle (not shown). Operate at high speed.
【００３１】ステップＳ１７において、タイマーＴの値
が所定値ＴHL以上の場合、ステップＳ２１へと進み、マ
イクロコンピュータ２１はワイパ制御装置２３にワイパ
の低速払拭信号を発信し、車両のフロントワイパを低速
にて作動させる。[0031] In step S17, if the value of the timer T is equal to or higher than the predetermined value T HL, proceeds to step S21, the microcomputer 21 transmits the low-speed wiping signals of the wiper to the wiper control apparatus 23, the front wiper of the vehicle low speed Operate with.
【００３２】ステップＳ１５において、マイクロコンピ
ュータ２１のレジスタ内のデータＮが所定値Ｂより小さ
い場合、ステップＳ５へと戻り、フロントワイパは作動
させない。If the data N in the register of the microcomputer 21 is smaller than the predetermined value B in step S15, the process returns to step S5, and the front wiper is not operated.
【００３３】本発明によれば、ステップＳ１１におい
て、減算値ΔＶの絶対値が所定値Ａ以上である場合、フ
ロントガラス１上に雨滴があると判断して、図示しない
車両のフロントワイパを作動させているため、図３にあ
るように、マイクロコンピュータ２１に入力されたデジ
タル信号Ｖn が増大した場合（Ｅ部）でも、減少した場
合（Ｆ部）でも、雨滴の存在を検出できる。According to the present invention, when the absolute value of the subtraction value ΔV is equal to or larger than the predetermined value A in step S11, it is determined that there is a raindrop on the windshield 1, and the front wiper of the vehicle (not shown) is operated. and for which, as in FIG. 3, even when the digital signal V n which is input to the microcomputer 21 is increased (E unit), when reduced (F section) but can detect the presence of raindrops.
【００３４】[0034]
【発明の効果】上記したように本発明によれば、受信素
子からの信号電圧が増大した場合でも、減少した場合で
も、雨滴の存在を検出できるため、検出精度のよい雨滴
検出装置を低コストで実現することができる。As described above, according to the present invention, the presence or absence of raindrops can be detected regardless of whether the signal voltage from the receiving element increases or decreases. Can be realized.
【図１】本発明の雨滴検出装置の概念図FIG. 1 is a conceptual diagram of a raindrop detecting device according to the present invention.
【図２】本発明の雨滴検出装置の作動フローチャート図FIG. 2 is an operation flowchart of the raindrop detecting device of the present invention.
【図３】本発明の雨滴検出装置の信号電圧線図FIG. 3 is a signal voltage diagram of the raindrop detecting device of the present invention.
【図４】従来技術による雨滴検出装置の送信素子及び受
信素子の取付図FIG. 4 is a mounting diagram of a transmitting element and a receiving element of the raindrop detecting device according to the related art.
【図５】従来技術による雨滴検出装置の信号電圧線図FIG. 5 is a signal voltage diagram of a conventional raindrop detecting device.
【図６】本発明による雨滴検出装置の送信素子及び受信
素子の取付図FIG. 6 is a mounting diagram of a transmitting element and a receiving element of the raindrop detecting device according to the present invention.
【図７】本発明による雨滴検出装置の信号電圧線図FIG. 7 is a signal voltage diagram of the raindrop detecting device according to the present invention.
１ フロントガラス ３ 送信素子 ５ 受信素子 ２１ マイクロコンピュータ ２３ ワイパ制御装置 DESCRIPTION OF SYMBOLS 1 Windshield 3 Transmitting element 5 Receiving element 21 Microcomputer 23 Wiper control device
Claims (4)
部材に対し弾性波を放射する送信素子と、前記プレート
部材上に設置され、前記送信素子からの弾性波が入力さ
れる受信素子とを備え、前記送信素子と前記受信素子と
を結ぶ直線に対して、前記送信素子、又は、前記受信素
子のいずれか一方を傾けて配置し、更に、該受信素子に
連結され、前記弾性波の振幅の変化量を演算する振幅変
化量演算手段と、前記振幅変化量演算手段が演算した振
幅の変化量が、所定値より大きい場合に雨滴が存在する
と判断する雨滴判定手段とからなる雨滴検出装置。1. A transmitting element installed on a plate member and emitting an elastic wave to the plate member, and a receiving element installed on the plate member and receiving an elastic wave from the transmitting element. With respect to a straight line connecting the transmitting element and the receiving element, one of the transmitting element and the receiving element is arranged to be inclined, and further connected to the receiving element, and the amplitude of the elastic wave is adjusted. A raindrop detecting device comprising: an amplitude change amount calculating means for calculating a change amount; and a raindrop determining means for determining that a raindrop exists when the amplitude change amount calculated by the amplitude change amount calculating means is larger than a predetermined value.
算手段が演算した振幅の変化量が、所定数回以上連続し
て所定値より大きい場合に雨滴が存在すると判断するこ
とを特徴とする請求項１を満足する雨滴検出装置。2. The method according to claim 1, wherein the raindrop determining means determines that a raindrop is present when the amplitude change amount calculated by the amplitude change amount calculating means is continuously larger than a predetermined value for a predetermined number of times or more. A raindrop detector that satisfies claim 1.
ると判断した場合に、車両のワイパーを作動させるワイ
パー作動制御手段を備えたことを特徴とする請求項２を
満足する雨滴検出装置。3. The raindrop detecting device according to claim 2, further comprising wiper operation control means for operating a wiper of the vehicle when said raindrop determining means determines that raindrops are present.
算手段が演算した振幅の変化量が、所定値より大きい状
態が所定数回以上連続していた時間が、所定時間より短
い場合に、車両のワイパーを高速で作動させることを特
徴とする請求項３を満足する雨滴検出装置。4. The method according to claim 1, wherein the change amount of the amplitude calculated by the amplitude change amount calculating means is greater than a predetermined value for a predetermined number of times or more. The raindrop detector according to claim 3, wherein the wiper of the vehicle is operated at a high speed.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9053538A JPH10253602A (en) | 1997-03-07 | 1997-03-07 | Raindrop detecting device |
| DE19809767A DE19809767A1 (en) | 1997-03-07 | 1998-03-06 | Raindrop detection device for vehicle windscreen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9053538A JPH10253602A (en) | 1997-03-07 | 1997-03-07 | Raindrop detecting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10253602A true JPH10253602A (en) | 1998-09-25 |
Family
ID=12945591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9053538A Pending JPH10253602A (en) | 1997-03-07 | 1997-03-07 | Raindrop detecting device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPH10253602A (en) |
| DE (1) | DE19809767A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104237976A (en) * | 2014-09-11 | 2014-12-24 | 河海大学 | Triggering ultrasonic tipping bucket rain gauge |
| JP2018510323A (en) * | 2015-03-09 | 2018-04-12 | ジャガー ランド ローバー リミテッドＪａｇｕａｒ Ｌａｎｄ Ｒｏｖｅｒ Ｌｉｍｉｔｅｄ | Windshield monitoring system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10100732A1 (en) * | 2001-01-10 | 2002-07-11 | Bosch Gmbh Robert | Device for automatically cleaning windows |
-
1997
- 1997-03-07 JP JP9053538A patent/JPH10253602A/en active Pending
-
1998
- 1998-03-06 DE DE19809767A patent/DE19809767A1/en not_active Ceased
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104237976A (en) * | 2014-09-11 | 2014-12-24 | 河海大学 | Triggering ultrasonic tipping bucket rain gauge |
| JP2018510323A (en) * | 2015-03-09 | 2018-04-12 | ジャガー ランド ローバー リミテッドＪａｇｕａｒ Ｌａｎｄ Ｒｏｖｅｒ Ｌｉｍｉｔｅｄ | Windshield monitoring system |
Also Published As
| Publication number | Publication date |
|---|---|
| DE19809767A1 (en) | 1998-09-10 |
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