JPS59147242A - Dust detecting apparatus for automobile - Google Patents
Dust detecting apparatus for automobileInfo
- Publication number
- JPS59147242A JPS59147242A JP2081283A JP2081283A JPS59147242A JP S59147242 A JPS59147242 A JP S59147242A JP 2081283 A JP2081283 A JP 2081283A JP 2081283 A JP2081283 A JP 2081283A JP S59147242 A JPS59147242 A JP S59147242A
- Authority
- JP
- Japan
- Prior art keywords
- light
- automobile
- light receiving
- receiving element
- amount
- 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
- 239000000428 dust Substances 0.000 title claims abstract description 11
- 238000001514 detection method Methods 0.000 claims abstract description 11
- 239000000779 smoke Substances 0.000 abstract description 9
- 230000035945 sensitivity Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 abstract 1
- 230000007423 decrease Effects 0.000 description 3
- 230000007257 malfunction Effects 0.000 description 3
- 230000005855 radiation Effects 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009429 electrical wiring Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000000391 smoking effect Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- 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
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
- G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は例えば自動車の車室内においてたばこの煙等の
粉塵を光学的に検出する粉塵検出装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dust detection device that optically detects dust such as cigarette smoke in the cabin of an automobile, for example.
この種の装置として、特公昭５７−２６３９９号公報に
記載されたものがある。この公知の装置にあっては、光
源より発生する放射光を直接的に受ける位置に配置され
、受光量に応じた電気信号を生じる第１の素子と、上記
光源よりの放射光の散乱光を受ける位置に配置され、受
光量に応じた電気信号を生じる第２の素子とを備えると
ともに、量受光素子が生じる電気信号の相対比を演算す
る比演算手段が設けられ°ζいる。そして、直接光と散
乱光との比を求めておいて、その得られた結果を比較装
置により一定の基準値と比較する。これにより、散乱光
／直接光の比が基準値より大のときに、出力信号を発生
ずる。This type of device is described in Japanese Patent Publication No. 57-26399. This known device includes a first element that is placed at a position that directly receives the radiation emitted from the light source and generates an electric signal according to the amount of received light, and a first element that generates an electric signal according to the amount of received light, and a first element that receives the scattered light of the radiation from the light source. A second element is disposed at a receiving position and generates an electric signal according to the amount of light received, and ratio calculating means is provided for calculating a relative ratio of the electric signals generated by the amount of light receiving element. Then, the ratio between the direct light and the scattered light is determined, and the obtained result is compared with a certain reference value using a comparison device. This generates an output signal when the ratio of scattered light/direct light is greater than the reference value.
上記の公知の装置において、検出感度を上げるためには
、比較装置で比較すべき基準値を小さくすることにりな
るが、このことは逆に電気ノイズに対しても敏感になり
、自動車内において使用する場合に誤作動を誘因してし
まう問題がある。In order to increase the detection sensitivity of the above-mentioned known device, the reference value to be compared with the comparison device must be made smaller, but this also makes it more sensitive to electrical noise, and There is a problem in that it may cause malfunction when used.
本発明は、上記の問題に鑑み、実質的な検出感度を下げ
ることなく電気ノイズに対する誤作動を防止した自動車
のための粉塵検出装置をいようすることを目的とする。SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a dust detection device for an automobile that prevents malfunction due to electrical noise without lowering the actual detection sensitivity.
このため本発明は、冒頭に述べた散乱光受光素子と直接
光受光素子とを使用するものにおいて、量素・子の受光
量の相対差を演算する比較装置を備え、その相対差が予
め設定された値以下となったときに出力信号を発生ずる
構成としたことを特徴とず、る。For this reason, the present invention uses a scattered light receiving element and a direct light receiving element described at the beginning, and is provided with a comparison device that calculates the relative difference in the amount of light received by the quantum element and the element, and the relative difference is set in advance. The present invention is characterized in that it is configured to generate an output signal when the value falls below the specified value.
添付図面に本発明の一実施例が示されＣいる。An embodiment of the invention is shown in the accompanying drawings.
この図において、符号ｌは光源をなす発光ダイオード、
２は直接光を受ける第１の受光素子、３は散乱光を受け
る第２の受光素子で、以上の素子は外界とは光学的に遮
蔽され通気性を有するケース４に配置されている。受光
素子２．３は受光ダイオードまたはフォトトランジスタ
を使用することができる。ケース４は自動車車室内にお
いて乗員の喫煙による煙を感知し易い部位、例えば天井
付近に配置されている。In this figure, the symbol l is a light emitting diode that serves as a light source;
2 is a first light-receiving element that receives direct light; 3 is a second light-receiving element that receives scattered light; these elements are arranged in a case 4 that is optically shielded from the outside world and has air permeability. A light receiving diode or a phototransistor can be used as the light receiving element 2.3. The case 4 is disposed in the interior of the vehicle at a location where smoke caused by a passenger's smoking is likely to be detected, for example, near the ceiling.
発光ダイオード１は、抵抗Ｒ１を介して定電圧源６に接
続され一定の光量で発光する。ｆｆ１ｌの受光素子２は
抵抗Ｒｓと接続されて、直接受光量に対応した電流を抵
抗Ｒｓに供給する。このため、抵抗Ｒｓの両端には、定
常状態である一定の値となる電圧Ｖａが生じる。一方、
第２の受光素子３は、抵抗Ｒｉの両端に散乱受光量に対
応した電流による電圧ｖｂを生じさせる。抵抗ＲｍとＲ
ｎは定常状態における電圧Ｖａとｖｂとの値を開塾する
役割を有する。これら両受光素子２．３によって得られ
る電圧Ｖａとｖｂとは、比較装置であるコンパレータ５
の各々の大刀端子に印加される。The light emitting diode 1 is connected to a constant voltage source 6 via a resistor R1 and emits light with a constant amount of light. The light receiving element 2 of ff1l is connected to a resistor Rs, and directly supplies a current corresponding to the amount of received light to the resistor Rs. Therefore, a voltage Va having a constant value in a steady state is generated across the resistor Rs. on the other hand,
The second light receiving element 3 generates a voltage vb at both ends of the resistor Ri by a current corresponding to the amount of scattered light received. Resistance Rm and R
n has the role of determining the values of voltages Va and vb in a steady state. The voltages Va and vb obtained by these two light receiving elements 2.3 are determined by a comparator 5 which is a comparison device.
is applied to each long sword terminal.
上記の構成において、ケース４内に煙が侵入していない
場合、電圧Ｖａは最大値でありがっ一定の値をとる。こ
のとき、電圧ｖｂは最小値でありやはり一定の値をとる
。このとき電気ノイズが回路内に誘起されたとしても、
電圧Ｖａとｖｂとの差は容易に接近するものではない。In the above configuration, when no smoke enters the case 4, the voltage Va is at its maximum value and takes a constant value. At this time, the voltage vb is the minimum value and also takes a constant value. Even if electrical noise is induced in the circuit at this time,
The difference between voltages Va and vb is not easily approached.
さ−で、ケース４内に煙が侵入すると、第１の受光素子
２を通じて流れる電流は煙の量に応じて減少し、この一
方第２の受光素子３を流れる電流は煙の量に応じ゛ζ増
加する。このことに対応して、コンパレータ５の入力電
圧Ｖａは電圧ｖｂに向がって低下し、逆に電圧ｖｂは電
圧Ｖａに向がって上昇する。煙の量が設定された値に達
すると両電圧値は一致し、設定された値を越えると両電
圧は逆転する。コンパレータ５は反転作動し、ローレベ
ルであった検出出力信号Ｓｏをハイレベルに転換する。Now, when smoke enters the case 4, the current flowing through the first light receiving element 2 decreases according to the amount of smoke, while the current flowing through the second light receiving element 3 decreases according to the amount of smoke. ζ increases. Corresponding to this, the input voltage Va of the comparator 5 decreases toward the voltage vb, and conversely, the voltage vb increases toward the voltage Va. When the amount of smoke reaches a set value, both voltage values match, and when the set value is exceeded, both voltages are reversed. The comparator 5 performs an inverting operation and converts the detection output signal So, which was at a low level, to a high level.
かくして、この装置は直接光の受光量と散乱光の受光量
との相対差をもって検出信号を発生ずることにより、電
気ノイズによる誤作動なく確実に車室内の粉塵を検出す
ることができる。得られた検出信号は車室内の粉塵を除
去するための装置、例えば空気清浄装置や自動窓昇降装
置、換気装置等の作動信号とすることができる。Thus, by generating a detection signal based on the relative difference between the amount of direct light received and the amount of scattered light received, this device can reliably detect dust in the vehicle interior without malfunction due to electrical noise. The obtained detection signal can be used as an activation signal for a device for removing dust inside the vehicle, such as an air purifier, an automatic window lifting device, a ventilation device, and the like.
なお、本発明は上記の実施例のように連続発光型のもの
限らず、間欠発光型のものに適用することができる。ま
た、比較装置における相対差の検出は、第１の受光素子
と第２の受光素子とを差動的に接続するとともに、その
合成出方信号を一定の基準信号と比較するようにしても
よい。また、受光素子が生じた電気信号を一旦デジタル
値信号に変換した後に、デジタル比較の方法で相対差を
判定するようにすることもできる。Note that the present invention is not limited to the continuous light emitting type as in the above embodiments, but can be applied to intermittent light emitting types. Further, the detection of the relative difference in the comparison device may be performed by differentially connecting the first light receiving element and the second light receiving element and comparing the combined output signal with a certain reference signal. . Furthermore, it is also possible to once convert the electric signal generated by the light-receiving element into a digital value signal, and then determine the relative difference by a digital comparison method.
以」二述べたように本発明によれば、自動車におい゛ζ
電気ノイズの影響なく粉塵を検出することができる。As described above, according to the present invention,
Dust can be detected without the influence of electrical noise.
添付図面は本発明の一実施例を示す電気結線図である。
■・・・光源をなす発光ダイオード、２・・・第１の受
光素子、３・・・第２の受光素子、４・・・ケース、５
・・・比較装置をなすコンパレータ。
代理人弁理士 岡 部 隆The accompanying drawings are electrical wiring diagrams showing one embodiment of the present invention. ■... Light emitting diode forming a light source, 2... First light receiving element, 3... Second light receiving element, 4... Case, 5
...A comparator that serves as a comparison device. Representative Patent Attorney Takashi Okabe
Claims (1)
れ、受光量に応じた電気信号を生じる第１の素子と、上
記光源よりの放射光の散乱光を受ける位置に配置され、
受光量に応じた電気信号を生じる第２の素子とを備える
自動車のための粉塵検出装置におい’乙１記ｆｆ１ｌゝ
および第２の素子のより生じる電気信号の相対差を演算
する比較装置とを備え、この比較装置より上記相対差が
予め設定した値以下になったときに出力信号を発生ずる
ようにした自動車のための粉塵検出装置。a first element disposed at a position to directly receive the emitted light emitted from the light source and generate an electrical signal according to the amount of received light; and a first element disposed at a position to receive the scattered light of the emitted light from the light source;
A dust detection device for an automobile comprising a second element that generates an electric signal according to the amount of light received, and a comparison device that calculates the relative difference between the electric signals generated by the second element and the second element. A dust detection device for an automobile, comprising: a comparison device that generates an output signal when the relative difference becomes equal to or less than a preset value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2081283A JPS59147242A (en) | 1983-02-10 | 1983-02-10 | Dust detecting apparatus for automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2081283A JPS59147242A (en) | 1983-02-10 | 1983-02-10 | Dust detecting apparatus for automobile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59147242A true JPS59147242A (en) | 1984-08-23 |
Family
ID=12037445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2081283A Pending JPS59147242A (en) | 1983-02-10 | 1983-02-10 | Dust detecting apparatus for automobile |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59147242A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6393546U (en) * | 1986-12-10 | 1988-06-16 | ||
| JP2013088434A (en) * | 2011-10-18 | 2013-05-13 | Boeing Co:The | Detection of airborne impurities |
-
1983
- 1983-02-10 JP JP2081283A patent/JPS59147242A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6393546U (en) * | 1986-12-10 | 1988-06-16 | ||
| JP2013088434A (en) * | 2011-10-18 | 2013-05-13 | Boeing Co:The | Detection of airborne impurities |
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