JPH0229896A - Optical vehicle detecting device - Google Patents
Optical vehicle detecting deviceInfo
- Publication number
- JPH0229896A JPH0229896A JP63180912A JP18091288A JPH0229896A JP H0229896 A JPH0229896 A JP H0229896A JP 63180912 A JP63180912 A JP 63180912A JP 18091288 A JP18091288 A JP 18091288A JP H0229896 A JPH0229896 A JP H0229896A
- Authority
- JP
- Japan
- Prior art keywords
- vehicle
- light
- light receiving
- infrared
- receiver
- 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.)
- Granted
Links
Landscapes
- Traffic Control Systems (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、赤外線を用いて車両の存在を検知する光学式
車両検知装置に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an optical vehicle detection device that detects the presence of a vehicle using infrared rays.
従来の技術
第３図は従来の光学式車両検知装置の構成を、第４図は
その従来の設置方法を示している。第３図において１は
投光器、２は投光器の赤外線照射をＯＮ、ＯＦＦさせる
制御信号である。３は受光器、４は３２個の受光素子、
５はサンプルホールド回路、６はマルチプレクサである
。７はサンプルホールド回路５とマルチプレクサ６を制
御する制御信号、８は受光素子の検出したレベルを伝送
するアナログ伝送線である。９は信号処理ユニットであ
り、１０はＡ／Ｄコンバータ、１１はそのデジタル出力
、１２はデジタル出力を処理して車両検知か否かを判定
する信号処理部である。また、第４図において、１，３
．９は第３図と同一である。BACKGROUND ART FIG. 3 shows the configuration of a conventional optical vehicle detection device, and FIG. 4 shows its conventional installation method. In FIG. 3, 1 is a light projector, and 2 is a control signal for turning on and off the infrared rays of the light projector. 3 is a light receiver, 4 is 32 light receiving elements,
5 is a sample hold circuit, and 6 is a multiplexer. 7 is a control signal for controlling the sample and hold circuit 5 and the multiplexer 6, and 8 is an analog transmission line for transmitting the level detected by the light receiving element. 9 is a signal processing unit, 10 is an A/D converter, 11 is a digital output thereof, and 12 is a signal processing unit that processes the digital output and determines whether a vehicle is detected. Also, in Figure 4, 1, 3
．． 9 is the same as in FIG.
また、１３は車両であシ、１４は投光器の赤外線照射範
囲、１５は車両が存在する時の赤外線の反射方向、１６
は車両が存在しない時の赤外線の反射方向、１７は受光
器の受光範囲である。In addition, 13 is a vehicle, 14 is the infrared irradiation range of the floodlight, 15 is the direction of reflection of infrared rays when a vehicle is present, and 16
is the reflection direction of infrared rays when no vehicle is present, and 17 is the light receiving range of the light receiver.
次に上記従来例の動作について説明する。第３図におい
て、投光器１は制御信号２により、０．１ｍＳの赤外線
照射とＱ、３ｍＳの照射停止を繰り返している。車両が
存在する時のみ投光器１より照射された赤外線の反射光
が受光器の受光範囲１７にあるため（第４図）、車両の
存在を検知できる。Next, the operation of the above conventional example will be explained. In FIG. 3, the projector 1 repeatedly emits infrared rays for 0.1 mS and stops the irradiation for Q, 3 mS in accordance with the control signal 2. Only when a vehicle is present, the reflected infrared light emitted from the projector 1 is within the light receiving range 17 of the light receiver (FIG. 4), so the presence of a vehicle can be detected.
まず、受光器３では投光器１の制御に同期してサンプル
ホールド回路５が３２個の受光素子４のそれぞれの出力
から赤外線照射中と照射停止中の受光レベルの差分のみ
を抽出し、出力する。これにより、投光器の赤外線照射
中、照射停止中にかかわらず一定である太陽光等の外来
光の影響を除去することができる。First, in the light receiver 3, in synchronization with the control of the light projector 1, the sample and hold circuit 5 extracts from the respective outputs of the 32 light receiving elements 4 only the difference between the light reception levels during infrared irradiation and when the irradiation is stopped, and outputs it. This makes it possible to eliminate the influence of external light such as sunlight, which remains constant regardless of whether the projector is emitting infrared rays or not.
次にサンプルホールド回路５の３２個の出力をマルチプ
レクサ６により順次選択することにより、３２個の出力
をシリアルな３２個のデータ列に変換し、アナログ伝送
線８へ出力し、信号処理ユニット９へ伝送する。信号処
理ユニット９では伝送されてきた３２個のデータ列をＡ
／Ｄコンバータ１０により逐次デジタル化し、その出力
１１を信号処理部１２へ送る。信号処理部１２では、予
めしきい値ａ及びしきい値すが設定されており、送られ
てくる３２個分のデータ列の各々についてしきい値ａと
比較する。Next, by sequentially selecting the 32 outputs of the sample and hold circuit 5 by the multiplexer 6, the 32 outputs are converted into 32 serial data strings, output to the analog transmission line 8, and then sent to the signal processing unit 9. Transmit. The signal processing unit 9 converts the 32 transmitted data strings into A
The signal is sequentially digitized by a /D converter 10, and its output 11 is sent to a signal processing section 12. In the signal processing unit 12, a threshold value a and a threshold value S are set in advance, and each of the 32 data strings sent is compared with the threshold value a.
そしてしきい値ａ以上であるデータの個数をカウントし
てその個数がしきい値す以上となった場合、そのデータ
列は検知レベル以上であると判断し、車両を検知した、
とする。また、第４図において、３２個の受光素子は車
線に対し車幅方向に配列されておシその方向の視野が広
いため、車線変更などで受光器の真下を通過しなくとも
十分に検知することができる。Then, when the number of pieces of data that is equal to or greater than the threshold value a is counted and the number becomes equal to or greater than the threshold value, it is determined that the data string is equal to or greater than the detection level, and the vehicle is detected.
shall be. In addition, in Figure 4, the 32 light receiving elements are arranged in the vehicle width direction with respect to the lane, and the field of view in that direction is wide, so it can be detected sufficiently even if you do not pass directly under the light receiver when changing lanes etc. be able to.
発明が解決しようとする課題
しかしながら、上記従来の光学式車両検知装置では、交
通波帯時において、第２図に示すように、車両１３のフ
ロントガラス部分が受光器３の受光領域１７を覆うよう
に車両１３が停止した場合、フロントガラスの反射面の
角度の差異と赤外線反射率の低下により受光器が受光で
きなくなり、検知が中断する。そして車両が移動を始め
るとその屋根からの反射により受光器が再び受光を開始
し、誤検知を起こすという問題があった。Problems to be Solved by the Invention However, in the conventional optical vehicle detection device described above, as shown in FIG. When the vehicle 13 stops, the light receiver cannot receive light due to the difference in the angle of the reflective surface of the windshield and the decrease in infrared reflectance, and detection is interrupted. Then, when the vehicle starts moving, the light receiver starts receiving light again due to reflection from the roof, causing a problem of false detection.
本発明はこのような従来の問題を解決するものであり、
車両のフロントガラスの影響による誤検知を防止する優
れた光学式車両検知装置を提供するものである。The present invention solves these conventional problems,
An object of the present invention is to provide an excellent optical vehicle detection device that prevents false detection due to the influence of a vehicle's windshield.
課題を解決するだめの手段
本発明は上記目的を達成するために、従来の車線幅員方
向のみに視野を定めていた受光素子の配列を変更して車
両進行方向にも視野をもてるようにしたものである。Means for Solving the Problems In order to achieve the above object, the present invention changes the arrangement of the light receiving elements, which conventionally had a field of view only in the direction of the lane width, so that it can also have a field of view in the direction in which the vehicle is traveling. It is something.
作 用
したがって、本発明によれば、受光素子の配列を変更し
車両進行方向にも視野をもてるようにすることにより、
交通渋滞時のフロントガラスの影響による検知の中断を
なくし、その後の誤検知を防止できるという効果を有す
る。Therefore, according to the present invention, by changing the arrangement of the light-receiving elements so as to have a field of view in the direction in which the vehicle is traveling,
This has the effect of eliminating interruptions in detection due to the influence of the windshield during traffic congestion, and preventing subsequent false detections.
実施例
第１図は本発明の一実施例の構成を示し、第２図はその
設置方法を示すものである。第１図において、２０は車
両進行方向に視野をもたせるため、３２個の受光素子の
他に新たに追加した受光素子であり、従来の受光範囲の
前後に３個づつ、車両のフロントガラスの車両進行方向
の長さよりも広い間隔で受光できるよう配置しである。Embodiment FIG. 1 shows the configuration of an embodiment of the present invention, and FIG. 2 shows its installation method. In Fig. 1, reference numeral 20 indicates a newly added light receiving element in addition to the 32 light receiving elements in order to provide a field of view in the direction in which the vehicle is traveling. They are arranged so that they can receive light at intervals wider than their length in the direction of travel.
第２図において、１７は従来からの受光範囲、１８．１
９はそれぞれ新たにその前後に配した受光範囲である。In Figure 2, 17 is the conventional light receiving range, 18.1
9 are light receiving ranges newly arranged before and after each of them.
次に上記実施例について説明する。上記実施例において
、渋滞交通流で、受光範囲１７が車両のフロントガラス
部分に重なって車両１３が停止した場合、受光範囲１７
を受は持つ受光素子には反射光が入らず、受光が途切れ
る。Next, the above embodiment will be explained. In the above embodiment, when the light receiving range 17 overlaps with the windshield of the vehicle and the vehicle 13 stops due to traffic congestion, the light receiving range 17
The reflected light does not enter the light-receiving element, which has a receiver, and light reception is interrupted.
ところがこの場合は、新らたな受光範囲１８゜１９は、
それぞれ車両のボンネット、屋根部分に当たるため、追
加した受光素子は赤外線の反射を受光することができる
。However, in this case, the new light receiving range of 18°19 is
Since the lights hit the hood and roof of the vehicle, the additional light-receiving elements can receive reflected infrared rays.
次に検知の判断手順について説明する。第１図の信号処
理部１２において、受光素子３２個のデータ列の各々に
ついてしきい値ａと比較するまでの過程は従来と同様で
ある。その後、しきい値ａ以上のデータ個数を受光範囲
１７，１８．１９別々にカウントし検知か否かを判断す
る。受光範囲１７．１８．１９で検知と判断した場合を
それぞれＡ、Ｂ、Ｃとすると、
（受光素子全体の検知）＝Ａあるいは（ＢかつＣ）とし
てお夛、このようにすれば、車両の前端・後端が受光領
域に重なりかけた場合の新らたな受光範囲１８あるいは
１９のみの検知判定がなくなシ、占有率の算出方法は受
光範囲１７のみの従来の方法と変更しないですむ。Next, the detection determination procedure will be explained. In the signal processing section 12 of FIG. 1, the process up to comparing each data string of the 32 light receiving elements with the threshold value a is the same as the conventional one. Thereafter, the number of data items exceeding the threshold value a is counted separately for the light receiving ranges 17, 18, and 19, and it is determined whether or not detection has occurred. Let A, B, and C be the cases in which detection is determined in the light receiving range 17, 18, and 19, respectively. Then, (detection of the entire light receiving element) = A or (B and C), if you do this, the vehicle There is no need to make a new detection judgment for only the light receiving range 18 or 19 when the front end/back end is about to overlap the light receiving area, and the method for calculating the occupancy rate does not need to be changed from the conventional method for only the light receiving range 17. .
このように、上記実施例によれば、受光範囲１７が車両
のフロントガランスに重なっても新らたな受光範囲１８
．１９が受光するため、車両を検知することができ、渋
滞交通流中の車両検知の中断をなくし、その後の誤検知
を防止することができるという利点を有する。In this way, according to the above embodiment, even if the light receiving range 17 overlaps the windshield of the vehicle, a new light receiving range 18 is created.
．． 19 receives light, it is possible to detect a vehicle, which has the advantage of eliminating interruptions in vehicle detection during congested traffic flow and preventing subsequent false detections.
発明の効果
本発明は上記実施例より明らかなように、受光範囲を車
両幅員方向のみならず、車両進行方向にも設けたもので
、交通渋滞において停止中の車両のフロントガラスによ
る検知の中断をなくシ、その後の誤検知を防止すること
ができるという効果を有する。Effects of the Invention As is clear from the above embodiments, the present invention has a light receiving range not only in the width direction of the vehicle but also in the direction in which the vehicle is traveling. This has the effect of preventing subsequent false detections.
１・・・投光器、２・・・投光器の制御信号、３・・・
受光器、４・・・受光素子、５・・・サンプルホールド
回路、６・・・マルチプレクサ、７・・・サンプルホー
ルド及びマルチプレクサの制御信号、８・・・アナログ
伝送線、９・・・信号処理ユニット、１０・・・Ａ／Ｄ
コンバータ、１１・・・Ａ／Ｄコンバータのデジタル出
力、１２・・・信号処理部、１３・・・車両、１４・・
・投光器の赤外線照射範囲、１５・・・車両が存在する
時の赤外線の反射方向、１６・・・車両が存在しない時
の赤外線の反射方向、１７・・・従来の受光器の受光範
囲、１８・・・新たに追加した受光器の受光範囲（前側
）、１９・・・新たに追加した受光器の受光範囲（後−
側）、２０・・・新たに追加した受光素子。
代理人の氏名 弁理士 粟 野 重 孝 ほか１名第
図
第２１！Ｉ
第
図
第
図1...Light emitter, 2...Light emitter control signal, 3...
Light receiver, 4... Light receiving element, 5... Sample hold circuit, 6... Multiplexer, 7... Control signal for sample hold and multiplexer, 8... Analog transmission line, 9... Signal processing Unit, 10...A/D
Converter, 11... Digital output of A/D converter, 12... Signal processing unit, 13... Vehicle, 14...
- Infrared irradiation range of the projector, 15... Direction of reflection of infrared rays when a vehicle is present, 16... Direction of reflection of infrared rays when no vehicle is present, 17... Light receiving range of conventional light receiver, 18 ...Receiving range of the newly added receiver (front side), 19...Receiving range of the newly added receiver (rear side)
side), 20...Newly added light receiving element. Name of agent: Patent attorney Shigetaka Awano and one other person Figure 21! I Figure Figure
Claims (1)
照射を制御させる手段を兼ね備えた赤外線投光器と、複
数の受光素子を備えた赤外線受光器とを備え、上記投光
器が照射した赤外線が車両に反射されることにより上記
受光器の受光レベルが変動し、その変動分を検出するこ
とにより車両の存在を検知することを特徴とする光学式
車両検知装置。An infrared projector having a means for emitting infrared light, a means for controlling the infrared light irradiation by a control signal, and an infrared receiver having a plurality of light receiving elements, the infrared light emitted by the projector is reflected by the vehicle. An optical vehicle detection device characterized in that the level of light received by the light receiver fluctuates, and the presence of a vehicle is detected by detecting the fluctuation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63180912A JP2715454B2 (en) | 1988-07-20 | 1988-07-20 | Optical vehicle detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63180912A JP2715454B2 (en) | 1988-07-20 | 1988-07-20 | Optical vehicle detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0229896A true JPH0229896A (en) | 1990-01-31 |
| JP2715454B2 JP2715454B2 (en) | 1998-02-18 |
Family
ID=16091465
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63180912A Expired - Fee Related JP2715454B2 (en) | 1988-07-20 | 1988-07-20 | Optical vehicle detection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2715454B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004302699A (en) * | 2003-03-28 | 2004-10-28 | Sumitomo Electric Ind Ltd | Vehicle detector |
| CN105279962A (en) * | 2014-07-06 | 2016-01-27 | 临安巨丰城市配套设备有限公司 | Urban traffic condition detection system and method based on wireless signal positioning |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55162200A (en) * | 1979-06-05 | 1980-12-17 | Koito Kogyo Kk | Traffic data collection system |
| JPS6148760A (en) * | 1984-08-16 | 1986-03-10 | Mitsubishi Electric Corp | Electromagnetic ultrasonic wave applied measuring device |
-
1988
- 1988-07-20 JP JP63180912A patent/JP2715454B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55162200A (en) * | 1979-06-05 | 1980-12-17 | Koito Kogyo Kk | Traffic data collection system |
| JPS6148760A (en) * | 1984-08-16 | 1986-03-10 | Mitsubishi Electric Corp | Electromagnetic ultrasonic wave applied measuring device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004302699A (en) * | 2003-03-28 | 2004-10-28 | Sumitomo Electric Ind Ltd | Vehicle detector |
| CN105279962A (en) * | 2014-07-06 | 2016-01-27 | 临安巨丰城市配套设备有限公司 | Urban traffic condition detection system and method based on wireless signal positioning |
| CN105279962B (en) * | 2014-07-06 | 2018-03-27 | 临安巨丰城市配套设备有限公司 | A kind of urban traffic conditions detecting system and method based on wireless signal positioning |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2715454B2 (en) | 1998-02-18 |
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|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |