JP3349783B2 - Gas detection device for controlling outside air introduction of automobiles - Google Patents
Gas detection device for controlling outside air introduction of automobilesInfo
- Publication number
- JP3349783B2 JP3349783B2 JP22815893A JP22815893A JP3349783B2 JP 3349783 B2 JP3349783 B2 JP 3349783B2 JP 22815893 A JP22815893 A JP 22815893A JP 22815893 A JP22815893 A JP 22815893A JP 3349783 B2 JP3349783 B2 JP 3349783B2
- Authority
- JP
- Japan
- Prior art keywords
- cover
- gas
- gas sensor
- outside air
- detection device
- 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.)
- Expired - Fee Related
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- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Air-Conditioning For Vehicles (AREA)
Description
【０００１】[0001]
【発明の利用分野】この発明はガスセンサを用いた自動
車の外気導入制御に関し、特にそのカバーに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to outside air introduction control of a vehicle using a gas sensor, and more particularly to a cover for the outside air.
【０００２】[0002]
【従来技術】ガスセンサにより自動車の車外空気の汚染
を検出して、カウルボックスなどに設けたダンパーを開
閉し、車室への換気をコントロールすることが提案され
ている。発明者らはＷＯ3等のＮＯｘセンサを用い、Ｗ
Ｏ3センサの信号を２階微分してディーゼル排ガスから
のＮＯｘを検出することを提案した（特開平５−１５
７，７１４号）。ガスセンサにはこれ以外にＳｎＯ2ガ
スセンサ（可燃性ガス）やフタロシアニンセンサ（ＮＯ
ｘ）などが提案され、センサ信号の処理では２階微分の
他に、１階微分やガスセンサ信号の差分等が提案されて
いる。2. Description of the Related Art It has been proposed to detect contamination of air outside a vehicle by a gas sensor, open and close a damper provided in a cowl box or the like, and control ventilation to a vehicle compartment. The inventors use a NOx sensor such as WO3 to
It has been proposed to detect the NOx from diesel exhaust gas by differentiating the signal of the O3 sensor by the second order (Japanese Patent Laid-Open No. 5-15 / 1993).
7,714). Other gas sensors include a SnO2 gas sensor (flammable gas) and a phthalocyanine sensor (NO
x) and the like have been proposed, and in the processing of the sensor signal, in addition to the second-order differentiation, the first-order differentiation, the difference between the gas sensor signals, and the like have been proposed.
【０００３】自動車の外気汚染の検出では、1) 速やか
にかつ風の影響無しに外気の汚染を検出でき、2) ゴミ
や水滴などがガスセンサに付着しないことが必要であ
る。発明者はこのためガスセンサを２重のカバーで覆
い、外側のカバーでは側面に開口を設け、内側のカバー
ではカバーの先端に開口を設けたものを試作した。外気
は外側カバーの側面開口からカバー内に入り、カバー間
の隙間を旋回して内側カバーの先端の開口からガスセン
サに触れるはずであった。しかしこのようなカバーでは
外気への応答が遅かった。In the detection of the outside air pollution of an automobile, it is necessary that 1) the outside air pollution can be detected promptly and without the influence of wind, and 2) dust and water droplets do not adhere to the gas sensor. For this reason, the inventor prototyped a gas sensor in which the gas sensor was covered with a double cover, the outer cover was provided with an opening on the side, and the inner cover was provided with an opening at the tip of the cover. The outside air would enter the cover through the side opening of the outer cover, rotate through the gap between the covers, and touch the gas sensor through the opening at the tip of the inner cover. However, such a cover responded slowly to the outside air.
【０００４】[0004]
【発明の課題】この発明の課題は、1) 外気の汚染に対
する応答が速やかで、2) ゴミや水滴等がガスセンサに
付着せず、3) 風の影響が小さな、自動車の外気導入制
御用ガス検出装置を提供することにある。The objects of the present invention are: 1) quick response to outside air pollution, 2) no dust or water droplets adhere to the gas sensor, 3) little influence of wind, and a gas for controlling the introduction of outside air into automobiles. A detection device is provided.
【０００５】[0005]
【発明の構成】この発明は、基板の下面に外気汚染検出
用のガスセンサを取り付けると共に、基板の下面にガス
センサを取り囲むようにカバーを取り付け、かつカバー
にはガスセンサよりも下方の位置にガス導入用の開口を
カバー下端にはドレイン用の開口を設け、さらにガスセ
ンサとカバー内周との間で基板に通気穴を設けた、自動
車の外気導入制御用ガス検出装置にある。好ましくは、
通気穴はガス導入用の開口よりも小さな穴とし、かつ通
気穴を複数設ける。また好ましくは、ガス導入用の開口
をカバー側面に複数個設ける。なおガス導入口とカバー
下端のドレイン用の開口は同じものでも良く、その場合
にはカバー下端に大きな開口を設ける。According to the present invention, a gas sensor for detecting outside air pollution is mounted on the lower surface of a substrate, and a cover is mounted on the lower surface of the substrate so as to surround the gas sensor. In the gas detection device for controlling the introduction of outside air of an automobile, a drain opening is provided at the lower end of the cover, and a vent hole is provided in the substrate between the gas sensor and the inner periphery of the cover. Preferably,
The ventilation hole is a hole smaller than the gas introduction opening, and a plurality of ventilation holes are provided. Preferably, a plurality of gas introduction openings are provided on the side surface of the cover. The gas inlet and the drain opening at the lower end of the cover may be the same, in which case a large opening is provided at the lower end of the cover.
【０００６】[0006]
【発明の作用】この発明では、基板が上でカバーの先端
が下となるようにガス検出装置を取り付け、ガスセンサ
よりも下方の位置でカバーにガス導入用の開口を設け
る。開口はガスセンサよりも下にあるので、ガスセンサ
が直接風に曝されることはない。基板にはガスセンサと
カバー内周との間の位置に通気穴を設け、通気穴が無い
とガスセンサの応答は遅く、通気穴を設けると応答は速
まる。発明者はこのことを実際に確認した（図７〜図１
０）。ガス検出装置は自動車のカウルボックスの中やラ
ジエターグリルの前面などに取り付け、基板に対してガ
スセンサやカバーの先端が下になるように取り付ける。
基板の上下では空気の流れが異なり、基板に通気穴を設
けると風圧の差で空気が通気穴を流れ、ガスセンサの応
答性能が改善される。カバーにはゴミや水滴などが侵入
し、これらはカバーの内壁に衝突して付着する。ここで
カバーの先端を下にし、カバー内でガスセンサが上にあ
るようにすると、ガスセンサにはゴミや水滴などが付着
せず、ゴミや水滴はカバーの底の開口から排出される。According to the present invention, the gas detector is mounted so that the substrate is on top and the tip of the cover is on the bottom, and an opening for introducing gas is provided in the cover at a position below the gas sensor. Since the opening is below the gas sensor, the gas sensor is not directly exposed to the wind. The substrate is provided with a ventilation hole at a position between the gas sensor and the inner periphery of the cover. If there is no ventilation hole, the response of the gas sensor is slow, and if the ventilation hole is provided, the response is fast. The inventor has actually confirmed this (FIGS. 7 to 1).
0). The gas detection device is mounted in a cowl box of an automobile, the front of a radiator grill, or the like, and is mounted on a substrate such that the tip of a gas sensor or a cover faces down.
The flow of air is different between the upper and lower portions of the substrate. If a ventilation hole is provided in the substrate, air flows through the ventilation hole due to a difference in wind pressure, and the response performance of the gas sensor is improved. Dust and water droplets enter the cover and collide with and adhere to the inner wall of the cover. Here, if the tip of the cover is turned down and the gas sensor is located inside the cover, dust and water droplets do not adhere to the gas sensor, and the dust and water droplets are discharged from the opening at the bottom of the cover.
【０００７】ガスセンサを風に曝さないため通気穴はガ
ス導入用の開口より小さな穴が好ましく、また複数個設
けてガスセンサの周囲の気流を均一にするのが好まし
い。ガス導入用の開口はカバーの側面に複数個設け、カ
バー内の空気の入れ替えを速やかにするのが好ましい。[0007] In order to prevent the gas sensor from being exposed to the wind, it is preferable that the ventilation hole is smaller than the gas introduction opening, and it is preferable that a plurality of ventilation holes are provided to make the air flow around the gas sensor uniform. It is preferable that a plurality of gas introduction openings are provided on the side surface of the cover so that the air in the cover can be quickly replaced.
【０００８】[0008]
【実施例】図１に自動車の外気導入制御用ガス検出装置
の取付位置を示し、自動車０１のカウルボックス０２の
内部やラジエター０３の前面のラジエターグリル等にガ
ス検出装置２を取り付ける。ガス検出装置２は下向きに
取り付け、検出装置の内で信号処理用のマイクロコンピ
ュータ４を車室０４の床下や車室０４の内部等に取り付
け、ガスセンサとプリアンプ（第１段のアンプ）を検出
装置２に組み込むのが好ましい。FIG. 1 shows a mounting position of a gas detecting device for controlling the introduction of outside air of a vehicle. The gas detecting device 2 is mounted on the inside of a cowl box 02 of a vehicle 01 or a radiator grill on the front of a radiator 03. The gas detection device 2 is mounted downward, and the microcomputer 4 for signal processing is mounted under the floor of the passenger compartment 04 or inside the passenger compartment 04 in the detection device, and the gas sensor and the preamplifier (first-stage amplifier) are detected. 2 is preferred.
【０００９】図２に、ガス検出装置２の構造を示す。図
において６はプリント基板で、８はＷＯ3やＳｎＯ2ある
いはフタロシアニン等のガスセンサで、ディーゼル車の
排ガスからのＮＯｘやガソリン車の排ガスからの可燃性
ガスを検出する。１０はガスセンサ８のキャップで、こ
の発明でいうカバーとは別のもので、１２はキャップ１
０の先端に設けた通気穴で、図示しない金属メッシュが
施してある。ガスセンサ８には他に開口はなく、通気部
は通気穴１２のみで、周囲の空気は通気穴１２から拡散
してキャップ１０の内部に入り、センサ本体１４に接触
する。センサ本体１４は例えば金属フレームにアルミナ
基板をダイボンドし、基板上にＷＯ3半導体とヒータと
を設けたものである。FIG. 2 shows the structure of the gas detection device 2. In the figure, reference numeral 6 denotes a printed circuit board, and 8 denotes a gas sensor such as WO3, SnO2 or phthalocyanine, which detects NOx from exhaust gas of diesel vehicles and flammable gas from exhaust gas of gasoline vehicles. Reference numeral 10 denotes a cap of the gas sensor 8 which is different from the cover referred to in the present invention.
A ventilation hole provided at the front end of 0 is provided with a metal mesh (not shown). There is no other opening in the gas sensor 8, the ventilation portion is only the ventilation hole 12, and the surrounding air diffuses from the ventilation hole 12, enters the inside of the cap 10, and comes into contact with the sensor main body 14. The sensor main body 14 is, for example, one in which an alumina substrate is die-bonded to a metal frame, and a WO3 semiconductor and a heater are provided on the substrate.
【００１０】１６はプラスチックや金属等のカバーで、
ガスセンサ８と共に基板６の下面に直付けしたが、他の
取付部材を介して取り付けても良い。カバー１６はガス
センサ８を取り囲むように取り付け、側面に２〜６個程
度のガス導入口１８を設け、先端にはガス導入口１８に
比べて直径が小さなドレイン口２０を設ける。ガスセン
サ８とカバー１６とはプリント基板６の下側に取り付
け、ガスセンサ８とカバー１６とを例えばカウルボック
ス０２の内部に配置し、プリント基板６がカウルボック
ス０２上にあるように取り付ける。ガスセンサ８とカバ
ー１６の内周面との間で、プリント基板６に例えば２〜
６個の通気穴２２を設け、カウルボックス０２の外部と
カバー１６の内部との間で気流を生じさせる。通気穴２
２はガス導入口１８に比べて直径を小さくし、例えば直
径１〜３ｍｍ程度とする。ガスセンサ８から見てプリン
ト基板６の反対側に付帯回路を搭載し、例えばガスセン
サ８の微分回路と増幅回路２４とを配置して、ガスセン
サ８の最終的な信号処理を行うマイクロコンピュータ４
とケーブル２６で接続する。これはカウルボックス０２
の内部やラジエター０３の周囲ではエンジンからの強い
ノイズがあり、マイクロコンピュータ４が誤動作するこ
とを防止するためと、ガスセンサ８の小さな信号を増幅
して用いるためプリント基板６に増幅回路２４を配置
し、増幅前にセンサ信号にノイズが乗ることを防止する
ためである。Reference numeral 16 denotes a cover made of plastic, metal, or the like.
Although attached directly to the lower surface of the substrate 6 together with the gas sensor 8, it may be attached via another attachment member. The cover 16 is attached so as to surround the gas sensor 8, and about 2 to 6 gas inlets 18 are provided on the side surface, and a drain port 20 having a smaller diameter than the gas inlet 18 is provided at the tip. The gas sensor 8 and the cover 16 are attached to the lower side of the printed circuit board 6, and the gas sensor 8 and the cover 16 are arranged, for example, inside the cowl box 02, and attached so that the printed circuit board 6 is located on the cowl box 02. Between the gas sensor 8 and the inner peripheral surface of the cover 16, for example,
Six ventilation holes 22 are provided to generate an air flow between the outside of the cowl box 02 and the inside of the cover 16. Vent hole 2
2 has a diameter smaller than that of the gas inlet 18, for example, about 1 to 3 mm in diameter. A microcomputer 4 that mounts an additional circuit on the opposite side of the printed circuit board 6 as viewed from the gas sensor 8, and arranges, for example, a differentiation circuit and an amplifier circuit 24 of the gas sensor 8 and performs final signal processing of the gas sensor 8.
And the cable 26. This is cowl box 02
There is strong noise from the engine inside the radiator 03 and around the radiator 03, and an amplification circuit 24 is arranged on the printed circuit board 6 to prevent the microcomputer 4 from malfunctioning and to amplify and use the small signal of the gas sensor 8. This is for preventing noise from being added to the sensor signal before amplification.
【００１１】実施例の作用を示すと、図での右から左へ
カウルボックス０２内を空気が流れている場合、空気は
図の白抜き矢印のように右側のガス導入口１８から入り
反対側のガス導入口１８から排出される。ガスセンサ８
が風に曝されると出力が変動するので、ガス導入口１８
はキャップ１０の先端より下側に配置する。空気の流れ
にはゴミや水滴等が含まれ、これがセンサ本体１４に付
着すると悪影響が生じるので、カバー１６の下端にドレ
イン口２０を設ける。ガス導入口１８から入り込んだ空
気はカバー１６の内面に衝突し、ゴミや水滴等はカバー
１６の下端に移動して、太い黒矢印のようにドレイン口
２０から排出される。またガス導入口１８をガスセンサ
８よりも下側に置くことは、ゴミや水滴等がガスセンサ
８に付着するのを防ぐ効果がある。In the operation of the embodiment, when air is flowing in the cowl box 02 from right to left in the drawing, the air enters from the right gas inlet 18 as shown by a white arrow in the drawing and is on the opposite side. Is discharged from the gas inlet 18. Gas sensor 8
When the gas is exposed to the wind, the output fluctuates.
Is disposed below the tip of the cap 10. The air flow contains dust, water droplets, and the like. If the dust adheres to the sensor main body 14, an adverse effect occurs. Therefore, the drain port 20 is provided at the lower end of the cover 16. The air entering from the gas inlet 18 collides with the inner surface of the cover 16, and dust and water droplets move to the lower end of the cover 16 and are discharged from the drain port 20 as indicated by the thick black arrow. Placing the gas inlet 18 below the gas sensor 8 has an effect of preventing dust, water droplets, and the like from adhering to the gas sensor 8.
【００１２】プリント基板６には通気穴２２を設け、ガ
ス導入口１８からカバー１６内に入り込んだ空気の一部
を、カウルボックス０２の内外の風圧の差を利用して通
気させ、通気穴２２に空気を流す。このことはラジエタ
ー０３の前面にガス検出装置２を配置する場合も同様
で、基板６の内外の気流の差を用いて通気穴２２に空気
を流す。細い矢印で通気穴２２の空気の流れを示す。発
明者は通気穴２２を設けないとガスセンサ８の応答が遅
れ、通気穴２２を設けるとセンサ８の応答が速まること
を確認した。なお通気穴２２は複数個設け、ガスセンサ
８の周囲に均一に気流が生じるようにするのが好まし
い。A vent hole 22 is provided in the printed circuit board 6, and a part of the air entering the cover 16 from the gas inlet 18 is ventilated by utilizing a difference in wind pressure between the inside and outside of the cowl box 02. Let air through. The same applies to the case where the gas detection device 2 is arranged on the front surface of the radiator 03, and the air is caused to flow through the ventilation holes 22 using the difference between the airflow inside and outside the substrate 6. The flow of air in the vent hole 22 is indicated by a thin arrow. The inventor has confirmed that the response of the gas sensor 8 is delayed unless the ventilation hole 22 is provided, and that the response of the sensor 8 is increased if the ventilation hole 22 is provided. Preferably, a plurality of ventilation holes 22 are provided so that an airflow is generated uniformly around the gas sensor 8.
【００１３】図３〜図５に変形例のカバーを示す。図３
のカバー３０では、ドレイン口と兼用の大きなガス導入
口３２をカバー３０の下端に設け、カバー３０の後流側
に小さな直径のガス排出口３４を設ける。この場合もガ
ス排出口３４はキャップ１０の先端よりも下側に配置
し、ガスセンサ８に直接風が触れないようにする。FIGS. 3 to 5 show modified covers. FIG.
In the cover 30, a large gas inlet 32 also serving as a drain port is provided at the lower end of the cover 30, and a small-diameter gas outlet 34 is provided downstream of the cover 30. Also in this case, the gas discharge port 34 is arranged below the tip of the cap 10 so that the gas sensor 8 is not directly in contact with the wind.
【００１４】図４に、２重カバー４０を用いた変形例を
示す。４２は外側カバー、４４は内側カバーで、例えば
外側カバー４２にドレイン口と兼用の大きなガス導入口
４６を設け、内側カバー４４には側面に２〜６個程度の
ガス導入口４８を設ける。下端のガス導入口４６から入
った空気は、２つのカバー４２，４４の間を旋回しなが
ら内側のガス導入口４８を介して内側カバー４４に入
り、空気の一部が通気穴２２を介してプリント基板６の
反対側に流れるため、ガスセンサ８に外部の空気が接触
する。FIG. 4 shows a modification using the double cover 40. Reference numeral 42 denotes an outer cover, and reference numeral 44 denotes an inner cover. For example, a large gas inlet 46 also serving as a drain port is provided on the outer cover 42, and about two to six gas inlets 48 are provided on the side surface of the inner cover 44. The air entering through the gas inlet 46 at the lower end enters the inner cover 44 through the gas inlet 48 while swirling between the two covers 42 and 44, and a part of the air passes through the vent hole 22. Since the air flows on the opposite side of the printed circuit board 6, external air comes into contact with the gas sensor 8.
【００１５】図５のカバー５０では、カバー５０を矢羽
根状に折り曲げて設けたガス導入口５２をカバー側面に
２〜６個程度設け、矢羽根部に空気を衝突させて流れの
向きを変え、カバー５０の内部を旋回させて、ガスセン
サ８に接触させる。ゴミや水滴はカバー５０の内壁に衝
突して下に集まり、ドレイン口２０から排出される。カ
バー５０内の空気の一部は通気穴２２から基板６の反対
側に流れ、この間にガスセンサ８の周囲の空気が入れ替
わる。In the cover 50 shown in FIG. 5, about two to six gas inlets 52 are provided on the side surface of the cover by bending the cover 50 into an arrow blade shape, and the direction of flow is changed by colliding air with the arrow blade portion. Then, the inside of the cover 50 is swung to make contact with the gas sensor 8. Dust and water droplets collide with the inner wall of the cover 50 and collect below, and are discharged from the drain port 20. Part of the air in the cover 50 flows from the ventilation hole 22 to the opposite side of the substrate 6, during which time the air around the gas sensor 8 is replaced.
【００１６】カバーの形状はこれ以外にも種々の変形が
可能で、重要なことはガス導入口をガスセンサ８よりも
下側に、（特にセンサ８の先端よりも下に）、配置し、
風が直接ガスセンサ８に触れないようにすることであ
る。またカバーの下端にドレイン口２０を設け、カバー
内に入り込んだゴミや水滴等をドレイン口２０から外に
排出することである。さらにカバーの内周とガスセンサ
との間の位置で、基板６に通気穴２２を設け、通気穴２
２でカバーの底部（ガスセンサ８の周囲）の空気を入れ
替えることである。The shape of the cover can be variously modified in addition to the above. What is important is that the gas inlet is disposed below the gas sensor 8 (particularly below the tip of the sensor 8).
The purpose is to prevent the wind from directly touching the gas sensor 8. Further, a drain port 20 is provided at the lower end of the cover, and dust, water droplets, and the like that have entered the cover are discharged from the drain port 20 to the outside. Further, a vent hole 22 is provided in the substrate 6 at a position between the inner periphery of the cover and the gas sensor.
Step 2 is to replace the air at the bottom of the cover (around the gas sensor 8).
【００１７】図６にガス検出装置２の回路を示す。自動
車のバッテリー等の電源を安定化して、例えば５Ｖの電
源＋ＶDDを取り出し、ガスセンサ８に供給する。６０は
ＷＯ3半導体６０で、６２はヒータ、６４は負荷抵抗で
ある。負荷抵抗６４へのガスセンサ出力をコンデンサ６
６で微分し、バイアスを加えた後に増幅回路２４で例え
ば１６〜６４倍に増幅する。次いでケーブル２６を利用
してマイクロコンピュータ４へ微分信号を送り、マイク
ロコンピュータ４で１階デジタル微分し、ＷＯ3半導体
６０の抵抗値の２階微分により外気の汚染を検出し、ダ
ンパー６８を駆動する。ＷＯ3半導体６０は高抵抗で、
微分信号は小さくハイインピーダンスなので、センサ８
の周囲で増幅しノイズが乗ることを防止する。一方マイ
クロコンピュータ４はエンジンから離れた位置に配置
し、誤動作を防止する。FIG. 6 shows a circuit of the gas detector 2. A power source such as an automobile battery is stabilized, and for example, a power source + VDD of 5 V is taken out and supplied to the gas sensor 8. Reference numeral 60 denotes a WO3 semiconductor 60, 62 denotes a heater, and 64 denotes a load resistance. The output of the gas sensor to the load resistance 64 is
6, and after applying a bias, the signal is amplified by, for example, 16 to 64 times in the amplifier circuit 24. Next, a differential signal is sent to the microcomputer 4 using the cable 26, the first-order digital differentiation is performed by the microcomputer 4, the contamination of the outside air is detected by the second-order differentiation of the resistance value of the WO 3 semiconductor 60, and the damper 68 is driven. WO3 semiconductor 60 has high resistance,
Since the differential signal is small and high impedance, the sensor 8
To prevent noise from getting on around. On the other hand, the microcomputer 4 is arranged at a position distant from the engine to prevent malfunction.
【００１８】図２のカバー１６を用い通気穴２２が有る
場合の実車走行での結果を図７，図８に、カバー１６を
用いたが通気穴２２を設けなかった場合の結果を図９，
図１０に示す。これらは２０分間の実車走行の結果を示
し、同時に測定したものである。図の縦軸は増幅回路２
４での１階微分信号で、これをマイクロコンピュータ４
でデジタル微分し、空気の汚染を検出する。ＷＯ3半導
体６０は主としてディーゼル排ガスのＮＯｘに感じ、Ｎ
Ｏｘに触れると抵抗値が増加するので、図での下向きの
勾配がいき値を越えるとダンパー６８を閉じることにな
る。また１階微分の勾配が大きな上向きの値を示すと、
ガソリン排ガスとしてダンパー６８を閉じる。図のフレ
ッシュは外気汚染を検出していない状態を、リサーキュ
レイトは外気汚染を検出した状態を示す。FIGS. 7 and 8 show the results of actual vehicle running when the cover 16 of FIG. 2 is used and the ventilation holes 22 are provided, and FIGS. 9 and 8 show the results of the case where the cover 16 is used but the ventilation holes 22 are not provided.
As shown in FIG. These show the results of running the vehicle for 20 minutes and were measured at the same time. The vertical axis in the figure is the amplifier 2
4 is the first order differential signal, which is
Digitally differentiated with to detect air contamination. The WO3 semiconductor 60 mainly feels NOx in diesel exhaust gas,
When Ox is touched, the resistance increases, so that when the downward slope in the figure exceeds the threshold, the damper 68 is closed. If the gradient of the first derivative shows a large upward value,
The damper 68 is closed as gasoline exhaust gas. Fresh in the figure indicates a state in which no outside air pollution has been detected, and Recirculate indicates a state in which outside air pollution has been detected.
【００１９】通気穴２２を設けた図７，図８の結果で
は、ガスセンサの信号は絶えず細かく変動し、図７でも
１箇所外気の汚染を検出した場所があり、図８の後半で
は頻繁に外気の汚染を検出している。これに対して通気
穴２２を設けていない図９，図１０の結果では、ガスセ
ンサの信号は鈍り、細かな特徴が失われている。また図
９には外気の汚染を検出した場所がなく、図１０の後半
の部分でも外気汚染の検出頻度が減少し、図８での５回
から図１０の４回に減少している。図９，図１０でガス
センサの信号が鈍り、外気汚染を検出する回数が減少し
たのは、ガスセンサ８の付近の空気が余り入れ替わらな
いようになり、応答特性が低下したことを示している。
そこで速やかに外気の汚染を検出するためには、基板６
に通気穴２２を設け、カウルボックス０２の内外の風圧
の差を利用して、ガスセンサ８の周囲の空気を入れ替え
る必要がある。7 and 8 in which the vent holes 22 are provided, the signal of the gas sensor fluctuates constantly and finely. In FIG. 7, there is one place where outside air contamination is detected, and in the latter half of FIG. Contamination has been detected. On the other hand, in the results of FIGS. 9 and 10 in which the ventilation hole 22 is not provided, the signal of the gas sensor is dull and fine features are lost. In FIG. 9, there is no place where outside air contamination is detected. In the latter half of FIG. 10, the frequency of detection of outside air pollution is also reduced, from five times in FIG. 8 to four times in FIG. In FIGS. 9 and 10, the fact that the signal of the gas sensor is dull and the number of times of detection of the outside air pollution is reduced indicates that the air near the gas sensor 8 is not replaced so much and the response characteristic is lowered.
Therefore, in order to quickly detect contamination of the outside air, the substrate 6
It is necessary to replace the air around the gas sensor 8 by providing a ventilation hole 22 in the airbag and utilizing the difference in wind pressure between the inside and outside of the cowl box 02.
【００２０】なおＷＯ3半導体６０は一般に特性が揃っ
ており、図７，図８と図９，図１０との結果の違いは、
ガスセンサ８のばらつきではなく通気穴２２の有無によ
るものである。また実施例ではＷＯ3半導体６０の２階
微分信号を用いたが、ＳｎＯ2ガスセンサやフタロシア
ニンガスセンサの１階微分信号や差分信号等でも良い。Note that the WO3 semiconductor 60 generally has the same characteristics, and the difference between the results shown in FIGS. 7 and 8 and FIGS.
This is not due to the variation of the gas sensor 8 but to the presence or absence of the vent hole 22. In the embodiment, the second order differential signal of the WO3 semiconductor 60 is used, but a first order differential signal or a differential signal of a SnO2 gas sensor or a phthalocyanine gas sensor may be used.
【００２１】[0021]
【発明の効果】この発明では、1) 外気の汚染に対する
応答が速やかで、2) ゴミや水滴等がガスセンサに付着
せず、3) 風の影響が小さな、自動車の外気導入制御用
ガス検出装置が得られる。According to the present invention, a gas detection device for controlling the introduction of outside air into an automobile, 1) a quick response to the contamination of the outside air, 2) no dust or water droplets adhere to the gas sensor, and 3) a small influence of wind. Is obtained.
【図１】 ガス検出装置の取付位置を示す図FIG. 1 is a diagram showing a mounting position of a gas detection device.
【図２】 ガス検出装置のカバーの断面図FIG. 2 is a cross-sectional view of a cover of the gas detection device.
【図３】 変形例でのカバーの断面図FIG. 3 is a sectional view of a cover in a modified example.
【図４】 変形例でのカバーの断面図FIG. 4 is a cross-sectional view of a cover in a modified example.
【図５】 変形例でのカバーの断面図FIG. 5 is a cross-sectional view of a cover according to a modified example.
【図６】 ガス検出装置の回路図FIG. 6 is a circuit diagram of a gas detection device.
【図７】 実施例のガス検出装置の出力波形を示す特
性図FIG. 7 is a characteristic diagram showing an output waveform of the gas detector according to the embodiment.
【図８】 実施例のガス検出装置の出力波形を示す特
性図FIG. 8 is a characteristic diagram showing an output waveform of the gas detector according to the embodiment.
【図９】 従来例のガス検出装置の出力波形を示す特
性図FIG. 9 is a characteristic diagram showing an output waveform of a conventional gas detection device.
【図１０】 従来例のガス検出装置の出力波形を示す特
性図FIG. 10 is a characteristic diagram showing an output waveform of a conventional gas detection device.
０１ 自動車 ０２ カウルボックス ０３ ラジエター ０４ 車室 ２ ガス検出装置 ４ マイクロコンピュータ ６ プリント基板 ８ ガスセンサ １０ キャップ １２ 通気穴 １４ センサ本体 １６ カバー １８ ガス導入口 ２０ ドレイン口 ２２ 通気穴 ２４ 増幅回路 ２６ ケーブル ３０ カバー ３２ ガス導入口 ３４ ガス排出口 ４０ ２重カバー ４２ 外側カバー ４４ 内側カバー ４６，４８ ガス導入口 ５０ カバー ５２ ガス導入口 ６０ ＷＯ3半導体 ６２ ヒータ ６４ 負荷抵抗 ６６ コンデンサ ６８ ダンパー 01 car 02 cowl box 03 radiator 04 cabin 2 gas detector 4 microcomputer 6 printed circuit board 8 gas sensor 10 cap 12 vent hole 14 sensor body 16 cover 18 gas inlet 20 drain port 22 vent hole 24 amplifying circuit 26 cable 30 cover 32 Gas inlet 34 Gas outlet 40 Double cover 42 Outer cover 44 Inner cover 46,48 Gas inlet 50 Cover 52 Gas inlet 60 WO3 semiconductor 62 Heater 64 Load resistance 66 Capacitor 68 Damper
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平１−296159（ＪＰ，Ａ) 特開 昭63−168849（ＪＰ，Ａ) 実開 昭53−108991（ＪＰ，Ｕ) 実開 昭60−59961（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) G01N 27/00 - 27/24 ＪＩＣＳＴファイル（ＪＯＩＳ)──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-296159 (JP, A) JP-A-63-168849 (JP, A) Fully open Showa 53-108991 (JP, U) Really open Showa 60- 59961 (JP, U) (58) Fields investigated (Int. Cl. 7 , DB name) G01N 27/00-27/24 JICST file (JOIS)
Claims (3)
サを取り付けると共に、 基板の下面に前記ガスセンサを取り囲むようにカバーを
取り付け、かつカバーにはガスセンサよりも下方の位置
にガス導入用の開口を、カバー下端にはドレイン用の開
口を設け、 さらにガスセンサとカバー内周との間で基板に通気穴を
設けた、自動車の外気導入制御用ガス検出装置。1. A gas sensor for detecting outside air pollution is attached to a lower surface of a substrate, a cover is attached to a lower surface of the substrate so as to surround the gas sensor, and an opening for introducing gas is provided on the cover at a position below the gas sensor. A gas detection device for controlling the introduction of outside air of an automobile, wherein a drain opening is provided at a lower end of the cover, and a vent hole is provided in the substrate between the gas sensor and the inner periphery of the cover.
穴とし、かつ通気穴を複数設けたことを特徴とする、請
求項１の自動車の外気導入制御用ガス検出装置。2. The gas detection device for controlling outside air introduction of an automobile according to claim 1, wherein the ventilation hole is a hole smaller than the gas introduction opening and a plurality of ventilation holes are provided.
設けたことを特徴とする、請求項１または２の自動車の
外気導入制御用ガス検出装置。3. The gas detection device for controlling outside air introduction of an automobile according to claim 1, wherein a plurality of gas introduction openings are provided on a side surface of the cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22815893A JP3349783B2 (en) | 1993-08-20 | 1993-08-20 | Gas detection device for controlling outside air introduction of automobiles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22815893A JP3349783B2 (en) | 1993-08-20 | 1993-08-20 | Gas detection device for controlling outside air introduction of automobiles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0755740A JPH0755740A (en) | 1995-03-03 |
| JP3349783B2 true JP3349783B2 (en) | 2002-11-25 |
Family
ID=16872144
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22815893A Expired - Fee Related JP3349783B2 (en) | 1993-08-20 | 1993-08-20 | Gas detection device for controlling outside air introduction of automobiles |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3349783B2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3587326B2 (en) * | 1996-04-08 | 2004-11-10 | 株式会社デンソー | Gas detector |
| KR100431934B1 (en) * | 2001-07-28 | 2004-05-17 | 씨멘스브이디오한라 주식회사 | Sensing apparatus for harmful gas |
| JP2003294674A (en) | 2002-04-04 | 2003-10-15 | Honda Motor Co Ltd | Attachment construction for gas sensor |
| JP4167008B2 (en) | 2002-05-24 | 2008-10-15 | 日本特殊陶業株式会社 | Gas detector |
| JP4133505B2 (en) * | 2003-03-28 | 2008-08-13 | 日本特殊陶業株式会社 | Gas sensor unit |
| JP4710355B2 (en) * | 2005-03-03 | 2011-06-29 | 株式会社デンソー | Sensor device |
| JP2010237007A (en) * | 2009-03-31 | 2010-10-21 | Honda Motor Co Ltd | Gas sensor |
-
1993
- 1993-08-20 JP JP22815893A patent/JP3349783B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0755740A (en) | 1995-03-03 |
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