JP2759975B2 - Vehicle ranging device and vehicle - Google Patents
Vehicle ranging device and vehicleInfo
- Publication number
- JP2759975B2 JP2759975B2 JP63211026A JP21102688A JP2759975B2 JP 2759975 B2 JP2759975 B2 JP 2759975B2 JP 63211026 A JP63211026 A JP 63211026A JP 21102688 A JP21102688 A JP 21102688A JP 2759975 B2 JP2759975 B2 JP 2759975B2
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- JP
- Japan
- Prior art keywords
- light
- vehicle
- distance
- waveform
- power supply
- 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.)
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Description
【発明の詳細な説明】 発明の利用分野 本発明は、車両間の車間距離を測定するための測距装
置に関するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distance measuring device for measuring an inter-vehicle distance.
従来の技術 従来からの測距装置のブロック構成図を第４図に示
す。第４図において、１は車両、２は車両用前照灯、３
は第１のレーザー光源、４は第２のレーザー光源、５は
対象物、６は光混合器、７は受光部、８は計測部、９は
演算部、10は表示部である。先行車や建築物など、車両
１の走行方向において走行の障害となるような対象物５
は、まずハロゲン電球を光源とする車両用前照灯２から
放射される照明光によって照明され、対象物５がいかな
るものであるかが、車両１を運転する運転者に視認され
る。その後、対象物５に向けて第１のレーザー光源３か
らレーザー光が照射される。第１のレーザー光源３から
照射され対象物３によって反射された光（イ）は、再び
車両１に戻る。この反射光を光混合器６に入射する。光
混合器６において、反射光（イ）と第２のレーザー光源
４からの直接入射する光（ロ）とが混合される。ただ
し、第１のレーザー光源３を駆動する周波数は、第２の
レーザー光源を駆動する周波数と異なるように設定され
ている。光混合器６から出力された混合光（ハ）を受光
部７に入射し、混合光（ハ）の光強度の時間的変化に対
応した電気的信号に変換する。第５図（ｂ）に受光部７
からの出力信号を示す。計測部８は、受光部７からの出
力信号のなかから、第１のレーザー光源３を駆動する周
波数と第２のレーザー光源を駆動する周波数との差で表
される周波数を中心とした周波数帯域の信号を抽出し、
第５図（ａ）に示すように車両１と対象物５との距離が
０の場合に対する位相差（時間差Δｘ）を計測する。演
算部９は、計測部８から出力された変調信号のビームの
時間差Δｘに対応する信号を入力し、下記の関係式から
車両１と対象物５との間の距離Ｌを算出する。2. Description of the Related Art FIG. 4 shows a block diagram of a conventional distance measuring device. In FIG. 4, 1 is a vehicle, 2 is a vehicle headlamp, 3
Denotes a first laser light source, 4 denotes a second laser light source, 5 denotes an object, 6 denotes an optical mixer, 7 denotes a light receiving unit, 8 denotes a measuring unit, 9 denotes a calculating unit, and 10 denotes a display unit. An object 5 such as a preceding vehicle or a building that may interfere with the traveling of the vehicle 1 in the traveling direction.
Is first illuminated by illumination light emitted from a vehicle headlight 2 using a halogen bulb as a light source, and the driver of the vehicle 1 can visually recognize what the object 5 is. Thereafter, the first laser light source 3 irradiates the object 5 with laser light. The light (a) emitted from the first laser light source 3 and reflected by the object 3 returns to the vehicle 1 again. This reflected light enters the optical mixer 6. In the light mixer 6, the reflected light (a) and the light (b) directly incident from the second laser light source 4 are mixed. However, the frequency for driving the first laser light source 3 is set to be different from the frequency for driving the second laser light source. The mixed light (c) output from the optical mixer 6 enters the light receiving unit 7 and is converted into an electric signal corresponding to the temporal change of the light intensity of the mixed light (c). FIG. 5B shows the light receiving section 7.
3 shows an output signal from the first embodiment. The measuring unit 8 has a frequency band centered on the frequency represented by the difference between the frequency for driving the first laser light source 3 and the frequency for driving the second laser light source from the output signals from the light receiving unit 7. Extract the signal of
As shown in FIG. 5 (a), a phase difference (time difference Δx) is measured when the distance between the vehicle 1 and the object 5 is 0. The calculation unit 9 receives a signal corresponding to the time difference Δx of the beam of the modulated signal output from the measurement unit 8 and calculates the distance L between the vehicle 1 and the object 5 from the following relational expression.
Ｌ＝Δx/2c（ｃは光速度） 表示部10は演算部９からの信号を入力し、上記演算から
得られたＬの値を車両１内の運転者に対して表示する。L = Δx / 2c (c is the speed of light) The display unit 10 receives a signal from the calculation unit 9 and displays the value of L obtained from the calculation to the driver in the vehicle 1.
第４図のブロック構成図を示す測距装置は、前照灯を
必要としない昼間でも使用できるが、昼間では対象物５
や車両１の周囲に存在する道路標識、電柱、木立など距
離の目安になるものがみえており、運転者は距離Ｌのお
およその値を推測することができるため、主として夜間
において先行車や障害物との距離を知るために用いられ
る。The distance measuring apparatus shown in the block diagram of FIG. 4 can be used even in the daytime when a headlight is not required.
There are road signs, telephone poles, and grove that are present around the vehicle 1 and can be used as a guide for the distance, and the driver can estimate the approximate value of the distance L. Used to know the distance to an object.
発明が解決しようとする課題 従来から測距装置では、その構成のなかにレーザー光
源および駆動回路３、４が必要であり、装置が複雑かつ
高価になるという問題点があった。Problems to be Solved by the Invention Conventionally, in a distance measuring device, a laser light source and drive circuits 3 and 4 are required in its configuration, and there has been a problem that the device is complicated and expensive.
課題を解決するための手段 本発明の車両用測距装置は、高圧放電ランプと、前記
高圧放電ランプに時間的に変化する電流を供給し点灯を
維持する電源回路と、周波数100Hz以上の変調光を前方
に照射する車両用前照灯と、前記車両用前照灯からの照
射光によって照明された対象物からの反射光を検知する
受光部と、前記受光部からの信号を処理し前記対象物に
よって反射された光波形と照射光波形または前記電源回
路の出力電流波形とをもとにして対象物との距離を算出
する処理部を備えたことを特徴とする。Means for Solving the Problems A ranging device for a vehicle according to the present invention includes a high-pressure discharge lamp, a power supply circuit for supplying a time-varying current to the high-pressure discharge lamp to maintain lighting, and a modulated light having a frequency of 100 Hz or more. A headlamp for a vehicle that irradiates the object forward, a light receiving unit that detects reflected light from an object illuminated by irradiation light from the vehicle headlamp, and a signal processing unit that processes a signal from the light receiving unit. A processing unit that calculates a distance to the object based on a light waveform reflected by the object and an irradiation light waveform or an output current waveform of the power supply circuit.
また、本発明の車両は、高圧放電ランプと、前記高圧
放電ランプに時間的に変化する電流を供給し点灯を維持
する電源回路と、周波数100Hz以上の変調光を前方に照
射する車両用前照灯と、前記車両用前照灯からの照射光
によって照明された対象物からの反射光を検知する受光
部と、前記受光部からの信号を処理し前記対象物によっ
て反射された光波形と照射光波形または前記電源回路の
出力電流波形とをもとにして対象物の距離を算出する処
理部を備え、前記処理部からの出力信号をもとに、所定
の距離情報が得られた場合、制動をかけるような構成と
したことを特徴とする。Further, the vehicle of the present invention includes a high-pressure discharge lamp, a power supply circuit for supplying a time-varying current to the high-pressure discharge lamp to maintain lighting, and a vehicle headlight for radiating forward a modulated light having a frequency of 100 Hz or more. A light, a light receiving unit that detects reflected light from an object illuminated by irradiation light from the vehicle headlight, and a light waveform reflected by the object by processing a signal from the light receiving unit and emitting light. A processing unit that calculates the distance of the object based on the optical waveform or the output current waveform of the power supply circuit, based on an output signal from the processing unit, when predetermined distance information is obtained, It is characterized in that it is configured to apply braking.
作用 車両用前照灯から放射される光を変調させることによ
り、測距装置における信号光として用いる。Function Modulated light emitted from a vehicle headlight is used as signal light in a distance measuring device.
実施例 本発明による測距装置のブロック構成図を第１図に示
す。第１図において、11は高圧放電ランプ、12は電源回
路、13は検知部である。車両用前照灯２は、高圧放電ラ
ンプ11、前記高圧放電ランプから放射される光の方向を
制御する光学系、電源回路12とから構成する。電源回路
12は電子回路式安定器であり、高圧放電ランプ11に変調
された電流を供給する。電源回路12から供給される電流
の周波数をｆとすると、高圧放電ランプ11において放電
が１サイクルあたり対称に行われる場合、放射される光
の変調周波数は2fである。高圧放電ランプ11において放
電が電流１サイクルあたり対称に行われない場合、高圧
放電ランプ11から放射される光は、前記周波数2fの成分
とともに、周波数ｆの成分をも有する。車両用前照灯２
によって照明される範囲内には、歩行者や単車の運転者
など人間が存在することがあり、前記電流周波数ｆが低
すぎると、車両用前照灯２からの光に対して、前記歩行
者や単車の運転者が不快なちらつきを感じ、道路視環境
が悪化するという問題がある。人間の眼がちらつきを感
ずる限界の周波数は約100Hzであるから、電源回路12か
ら供給される電流周波数ｆはこれ以上とすれば、不快な
ちらつきを生ずる光を発生することはない。FIG. 1 shows a block diagram of a distance measuring apparatus according to the present invention. In FIG. 1, 11 is a high-pressure discharge lamp, 12 is a power supply circuit, and 13 is a detection unit. The vehicle headlamp 2 includes a high-pressure discharge lamp 11, an optical system for controlling the direction of light emitted from the high-pressure discharge lamp, and a power supply circuit 12. Power circuit
Reference numeral 12 denotes an electronic ballast, which supplies a modulated current to the high-pressure discharge lamp 11. Assuming that the frequency of the current supplied from the power supply circuit 12 is f, when discharge is performed symmetrically in one cycle in the high-pressure discharge lamp 11, the modulation frequency of the emitted light is 2f. When the discharge is not performed symmetrically per current cycle in the high-pressure discharge lamp 11, the light emitted from the high-pressure discharge lamp 11 has the frequency 2f component as well as the frequency f component. Vehicle headlamp 2
There may be a person such as a pedestrian or a driver of a motorcycle in a range illuminated by the vehicle. Also, there is a problem that the driver of the motorcycle feels uncomfortable flickering and the road viewing environment deteriorates. Since the limit frequency at which the human eye perceives flicker is about 100 Hz, if the current frequency f supplied from the power supply circuit 12 is higher than this, light that causes unpleasant flicker will not be generated.
本発明による測距装置において、車両１および対象物
５との間の距離を計測する原理は、従来例と同様であ
る。すなわち、先行車や建築物など、車両１の走行方向
において走行の障害となるような対象物５は、まず車両
用前照灯２から放射される可視光によって照明され、対
象物５がいかなるものであるかが、車両１を運転する運
転者に視認される。また車両用前照灯２からの照明光が
対象物５によって反射された光を受光部７で受光する。
検知部13は受光部７からの信号を入力し、受光部７から
出力される信号のなかから、前記周波数2fを中心とした
周波数帯域の信号を抽出する。計測部８は、電源回路12
からの信号（第２図（ａ））および検知部７からの信号
（第２図（ｂ））を入力し、それぞれの変調信号のピー
クの時間差Δｘを計測する。演算部９は、計測部８から
出力された変調信号のピークの時間差に対応する信号を
入力し、車両１および対象物５との間の距離Ｌを算出す
る。表示部10は演算部９からの信号を入力し、上記演算
から得られたＬの値を車両１内の運転者に対して表示す
る。このように高圧放電ランプ11を電子回路式安定器な
どによる高周波変調された電流を供給する電源回路12で
点灯することにより、従来必要とされていたレーザー光
源を必要としない、簡単な構成で安価な測距装置とする
ことができる。In the distance measuring apparatus according to the present invention, the principle of measuring the distance between the vehicle 1 and the object 5 is the same as that of the conventional example. That is, an object 5 such as a preceding vehicle or a building, which obstructs the traveling of the vehicle 1 in the traveling direction, is first illuminated by visible light radiated from the vehicle headlight 2, and the object 5 Is visually recognized by the driver who drives the vehicle 1. The light receiving unit 7 receives the light reflected by the object 5 from the illumination light from the vehicle headlight 2.
The detection unit 13 receives a signal from the light receiving unit 7 and extracts a signal in a frequency band around the frequency 2f from the signals output from the light receiving unit 7. The measuring unit 8 includes a power supply circuit 12
(FIG. 2 (a)) and the signal (FIG. 2 (b)) from the detection unit 7, and the time difference Δx between the peaks of the respective modulated signals is measured. Arithmetic unit 9 receives a signal corresponding to the time difference between the peaks of the modulated signal output from measuring unit 8 and calculates distance L between vehicle 1 and object 5. The display unit 10 receives the signal from the calculation unit 9 and displays the value of L obtained from the calculation to the driver in the vehicle 1. By illuminating the high-pressure discharge lamp 11 with the power supply circuit 12 that supplies a high-frequency modulated current by an electronic ballast or the like, a laser light source, which was conventionally required, is not required. It is possible to provide a simple ranging device.
本発明の実施例の説明において、電流周波数の２倍
（2f）の周波数帯域における位相により距離を測定する
構成として説明したが、周波数ｆよりも低い周波数ｆ′
で電流を振幅変調させ、その周波数ｆ′帯域における位
相によっても同様な構成で距離を測定することが可能で
ある。すなわち、第３図に示すように、周波数ｆ′にお
ける振幅変調（周波数ｆにおける振幅変調のピークの包
絡線）のピークの時間差を計測することにより、同様の
効果が得られる。ただし、照明光のちらつきを防止する
ため、周波数ｆ′は100Hz以上とする。In the description of the embodiment of the present invention, the configuration has been described in which the distance is measured by the phase in the frequency band twice (2f) the current frequency, but the frequency f 'is lower than the frequency f.
, The current can be amplitude-modulated, and the distance can be measured with a similar configuration by using the phase in the frequency f 'band. That is, as shown in FIG. 3, the same effect can be obtained by measuring the time difference between the peaks of the amplitude modulation at the frequency f '(the envelope of the peak of the amplitude modulation at the frequency f). However, in order to prevent flickering of the illumination light, the frequency f 'is set to 100 Hz or more.
なお、本実施例において、表示部10を設けた構成とし
て説明したが、必ずしも構成に含まなくともよく、演算
部９からの出力信号を直接、車両１におけるブレーキな
どの制御系へ入力し、前方に対象物５が急に出現するよ
うな距離情報が演算部から得られた場合、制動をかける
ような構成であってもかまわない。Although the present embodiment has been described as having the configuration in which the display unit 10 is provided, the display unit 10 is not necessarily included in the configuration, and an output signal from the arithmetic unit 9 is directly input to a control system such as a brake in the vehicle 1 to be forwarded. When the distance information that the object 5 suddenly appears in the above is obtained from the calculation unit, the configuration may be such that braking is applied.
計測部８の入力信号は、電源回路12から得るものとし
たが、高圧放電ランプ11の近傍に第２の受光部を設け、
照明光の一部を受光して得た信号を計測部８に入力して
も同様の効果が得られる。また、光の変調方式は振幅変
調でなくとも、デジタル変調など他の方式であってもよ
い。Although the input signal of the measuring unit 8 is obtained from the power supply circuit 12, a second light receiving unit is provided near the high pressure discharge lamp 11,
The same effect can be obtained even if a signal obtained by receiving a part of the illumination light is input to the measuring unit 8. The light modulation method is not limited to the amplitude modulation, but may be another method such as digital modulation.
発明の効果 高圧放電ランプを電子回路式安定器など高周波変調さ
れた電流を供給する電源回路で点灯することにより、簡
単な構成で安価な測距装置とすることができる。Advantageous Effects of the Invention By lighting a high-pressure discharge lamp with a power supply circuit that supplies a high-frequency modulated current such as an electronic ballast, it is possible to provide an inexpensive distance measuring device with a simple configuration.
第１図は本発明による測距装置のブロック構成図、第２
図は本発明による測距装置における電源回路からの信号
波形（ａ）および検知部からの信号波形（ｂ）を示す
図、第３図は本発明による測距装置における電源回路か
らの信号波形（ａ）および検知部からの信号波形（ｂ）
のもうひとつの例を示す図、第４図は従来からの測距装
置のブロック構成図、第５図は従来からの測距装置にお
いて受光部７からの信号のうち車両と対象物との距離が
０の場合（ａ）および車両と対象物とがある距離をもつ
場合（ｂ）を示す図である。 １……車両、２……車両用前照灯、５……対象物、７…
…受光部、８……計測部、９……演算部、10……表示
部、11……高圧放電ランプ、12……電源回路、13……検
知部。FIG. 1 is a block diagram of a distance measuring apparatus according to the present invention.
FIG. 3 is a diagram showing a signal waveform (a) from a power supply circuit and a signal waveform (b) from a detection unit in the distance measuring device according to the present invention. FIG. 3 is a diagram showing a signal waveform ( a) and the signal waveform from the detector (b)
FIG. 4 is a block diagram of a conventional distance measuring device, and FIG. 5 is a diagram showing a distance between a vehicle and an object in a signal from the light receiving unit 7 in the conventional distance measuring device. Is 0 (a) and the case where the vehicle and the object have a certain distance (b). 1 ... vehicle, 2 ... vehicle headlight, 5 ... object, 7 ...
... Light receiving section, 8... Measuring section, 9... Arithmetic section, 10... Display section, 11... High-pressure discharge lamp, 12.
Claims (5)
時間的に変化する電流を供給し点灯を維持する電源回路
と、周波数100Hz以上の変調光を前方に照射する車両用
前照灯と、前記車両用前照灯からの照射光によって照明
された対象物からの反射光を検知する受光部と、前記受
光部からの信号を処理し前記対象物によって反射された
光波形と照射光波形または前記電源回路の出力電流波形
とをもとにして前記対象物との距離を算出する処理部を
備えた車両用測距装置。1. A high-pressure discharge lamp, a power supply circuit for supplying a time-varying current to the high-pressure discharge lamp and maintaining lighting, a vehicular headlamp for irradiating forward with modulated light having a frequency of 100 Hz or more, A light receiving unit that detects reflected light from an object illuminated by irradiation light from the vehicle headlight, and a light waveform and an irradiation light waveform that are processed by processing a signal from the light receiving unit and are reflected by the object. A ranging device for a vehicle, comprising a processing unit for calculating a distance to the object based on an output current waveform of the power supply circuit.
波形と対象物からの反射光波形との時間差から、対象物
までの距離を算出する請求項１記載の車両用測距装置。2. A vehicle distance measuring apparatus according to claim 1, wherein the processing section calculates a distance to the object from a time difference between an irradiation light waveform from the vehicle headlight and a reflected light waveform from the object. apparatus.
物からの反射光波形との時間差から、対象物までの距離
を算出する請求項１記載の車両用測距装置3. The ranging device for a vehicle according to claim 1, wherein the processing unit calculates a distance to the object based on a time difference between an output current waveform of the power supply circuit and a reflected light waveform from the object.
ンプを点灯し、このうち高い周波数成分で対象物との距
離を算出する請求項１記載の車両用測距装置4. A distance measuring apparatus for a vehicle according to claim 1, wherein the power supply circuit turns on the high-pressure discharge lamp at two frequencies, high and low, and calculates the distance to the object with a high frequency component.
時間的に変化する電流を供給し点灯を維持する電源回路
と、周波数100Hz以上の変調光を前方に照射する車両用
前照灯と、前記車両用前照灯からの照射光によって照明
された対象物からの反射光を検知する受光部と、前記受
光部からの信号を処理し前記対象物によって反射された
光波形と照射光波形または前記電源回路の出力電流波形
とをもとにして前記対象物との距離を算出する処理部を
備え、前記処理部からの出力信号をもとに、所定の距離
情報が得られた場合、制動をかけるような構成としたこ
とを特徴とする車両。5. A high-pressure discharge lamp, a power supply circuit for supplying a time-varying current to the high-pressure discharge lamp to maintain lighting, a vehicular headlamp for irradiating forward with modulated light having a frequency of 100 Hz or more. A light receiving unit that detects reflected light from an object illuminated by irradiation light from the vehicle headlight, and a light waveform and an irradiation light waveform that are processed by processing a signal from the light receiving unit and are reflected by the object. A processing unit that calculates a distance to the object based on an output current waveform of the power supply circuit, and based on an output signal from the processing unit, when predetermined distance information is obtained, braking is performed. A vehicle characterized in that it is configured to be applied.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63211026A JP2759975B2 (en) | 1988-08-25 | 1988-08-25 | Vehicle ranging device and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63211026A JP2759975B2 (en) | 1988-08-25 | 1988-08-25 | Vehicle ranging device and vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0259608A JPH0259608A (en) | 1990-02-28 |
| JP2759975B2 true JP2759975B2 (en) | 1998-05-28 |
Family
ID=16599130
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63211026A Expired - Fee Related JP2759975B2 (en) | 1988-08-25 | 1988-08-25 | Vehicle ranging device and vehicle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2759975B2 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH055620A (en) * | 1991-06-27 | 1993-01-14 | Seikosha Co Ltd | Distance detector |
| JP2006021720A (en) * | 2004-07-09 | 2006-01-26 | Nissan Motor Co Ltd | Lamp device with distance measuring function |
| JP2006172210A (en) * | 2004-12-16 | 2006-06-29 | Matsushita Electric Works Ltd | Distance image sensor for vehicle, and obstacle monitoring device using the same |
| US7855376B2 (en) * | 2005-12-19 | 2010-12-21 | Institut National D'optique | Lighting system and method for illuminating and detecting object |
| DE102006058156A1 (en) * | 2006-12-09 | 2008-06-12 | Conti Temic Microelectronic Gmbh | Motor vehicle has exterior lighting, which is modulated for transmission of vehicle information of modulation signal, where exterior lighting has semiconductor illuminant, particularly light emitting diode or laser diode |
| EP2160629B1 (en) * | 2007-06-18 | 2017-04-26 | Leddartech Inc. | Lighting system with driver assistance capabilities |
| JP4701279B2 (en) * | 2008-11-06 | 2011-06-15 | 本田技研工業株式会社 | Visual support device |
| US8908159B2 (en) | 2011-05-11 | 2014-12-09 | Leddartech Inc. | Multiple-field-of-view scannerless optical rangefinder in high ambient background light |
| CA2960123C (en) | 2014-09-09 | 2021-04-13 | Leddartech Inc. | Discretization of detection zone |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63153900A (en) * | 1986-12-17 | 1988-06-27 | 松下電器産業株式会社 | Apparatus for arranging component |
-
1988
- 1988-08-25 JP JP63211026A patent/JP2759975B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63153900A (en) * | 1986-12-17 | 1988-06-27 | 松下電器産業株式会社 | Apparatus for arranging component |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0259608A (en) | 1990-02-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |