JPH03134531A - Pressure sensor - Google Patents
Pressure sensorInfo
- Publication number
- JPH03134531A JPH03134531A JP27030689A JP27030689A JPH03134531A JP H03134531 A JPH03134531 A JP H03134531A JP 27030689 A JP27030689 A JP 27030689A JP 27030689 A JP27030689 A JP 27030689A JP H03134531 A JPH03134531 A JP H03134531A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- sliding part
- case
- transfer liquid
- volume
- 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
- 239000007788 liquid Substances 0.000 claims abstract description 15
- 238000001514 detection method Methods 0.000 claims abstract description 12
- 230000005540 biological transmission Effects 0.000 claims description 25
- 230000004044 response Effects 0.000 abstract description 3
- 238000007789 sealing Methods 0.000 abstract description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract 1
- 239000003921 oil Substances 0.000 abstract 1
- 229910052710 silicon Inorganic materials 0.000 abstract 1
- 239000010703 silicon Substances 0.000 abstract 1
- 239000012530 fluid Substances 0.000 description 15
- 238000002485 combustion reaction Methods 0.000 description 6
- 238000009835 boiling Methods 0.000 description 3
- 229920002545 silicone oil Polymers 0.000 description 3
- 230000006903 response to temperature Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Landscapes
- Measuring Fluid Pressure (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、圧力検知部とダイアフラムとの間に設けら
れた圧力伝達室に圧力伝達液が封入された圧力センサに
関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a pressure sensor in which a pressure transmission fluid is sealed in a pressure transmission chamber provided between a pressure sensing portion and a diaphragm.
第２図は従来の圧力センサの一例を示す縦断面図であり
、１はエンジンに取り付けられたケース、２はケース１
内に設けられた半導体ストレンゲージからなる圧力検知
部、３は圧力検知部２に先端部が接続された信号線、４
はケース１を密閉するためのプラグ、５はケース１の下
端部に設けられたダイアフラム、６はダイアフラム５と
圧力検知部２との間に形成された圧力伝達室７内に封入
された高沸点のシリコンオイルからなる圧力伝達液であ
る。FIG. 2 is a longitudinal sectional view showing an example of a conventional pressure sensor, in which 1 is a case attached to an engine, and 2 is a case 1.
3 is a signal line whose tip end is connected to the pressure sensor 2;
is a plug for sealing the case 1; 5 is a diaphragm provided at the lower end of the case 1; 6 is a high boiling point sealed in a pressure transmission chamber 7 formed between the diaphragm 5 and the pressure detection unit 2; This is a pressure transmission fluid made of silicone oil.
上記のように構成された圧力センサにおいては、燃焼室
内の圧力上昇によりダイアフラム５が変形し、その変形
に伴い圧力伝達液６内の圧力が上昇し、その上昇圧力を
圧力検知部２が検知する。この検知結果から、燃焼室内
の燃焼状態が検知され、この情報から例えば点火プラグ
の点火時期が制御される。In the pressure sensor configured as described above, the diaphragm 5 deforms due to an increase in pressure within the combustion chamber, and the pressure within the pressure transmission fluid 6 increases due to the deformation, and the pressure detection unit 2 detects the increased pressure. . Based on this detection result, the combustion state within the combustion chamber is detected, and based on this information, for example, the ignition timing of the spark plug is controlled.
上記のように構成された従来の圧力センサにおいては、
圧力センサの周囲の温度変化に応じて圧力伝達液６の体
積が変動するとともに圧力伝達液６の圧力が変動し、そ
の結果圧力検知部２が燃焼室内の圧力変動として検知し
てしまうといった問題点があった。In the conventional pressure sensor configured as above,
The problem is that the volume of the pressure transmission fluid 6 fluctuates in response to temperature changes around the pressure sensor, and the pressure of the pressure transmission fluid 6 also fluctuates, and as a result, the pressure detection unit 2 detects it as a pressure fluctuation within the combustion chamber. was there.
この発明は、かかる問題点を解消するためになされたも
ので、周囲の温度変化により影響を受けることなく正確
に圧力を検知する圧力センナを得ることを目的とする。The present invention was made to solve this problem, and an object of the present invention is to provide a pressure sensor that accurately detects pressure without being affected by changes in ambient temperature.
この発明に係る圧力センサは、ケースに設けられたダイ
アフラムと５前記ケース内に設けられ圧力を検知する圧
力検知部と、この圧力検知部と前記ダイアフラムとの間
に形成された圧力伝達室と、この圧力伝達室に摺動自在
に設けられた熱膨張係数の小さな摺動部と、この摺動部
と前記圧力検知部との間または摺動部と前記ダイアフラ
ムとの間のいずれかに封入された圧力伝達液とを備えた
ものである。The pressure sensor according to the present invention includes a diaphragm provided in a case, a pressure detection section provided in the case to detect pressure, and a pressure transmission chamber formed between the pressure detection section and the diaphragm. A sliding part with a small coefficient of thermal expansion is slidably provided in the pressure transmission chamber, and a sliding part is sealed between the sliding part and the pressure sensing part or between the sliding part and the diaphragm. It is equipped with a pressure transmission fluid.
この発明においては、圧力センサの周囲の温度変化に応
じて圧力伝達液の体積が変動した場合、その変動量は小
さく、またその変動量はケースの温度による体積変動に
より吸収される。In this invention, when the volume of the pressure transmission liquid changes in response to a change in the temperature around the pressure sensor, the amount of the change is small, and the amount of change is absorbed by the volume change due to the temperature of the case.
［実施例〕 以下、この発明の実施例を図について説明する。[Example〕 Embodiments of the present invention will be described below with reference to the drawings.
第１図はこの発明の一実施例を示すもので、第２図と同
一または相当部分は同一符号を付し、その説明は省略す
る８
図において、１０は圧力伝達室７に摺動自在に設けられ
た熱膨張係数の小さい摺動部、１１は摺動部１０と圧力
検知部２との間に封入された高沸点のシリコンオイルか
らなる圧力伝達液である。FIG. 1 shows an embodiment of the present invention, and the same or corresponding parts as in FIG. The provided sliding part 11 having a small coefficient of thermal expansion is a pressure transmission liquid made of high boiling point silicone oil sealed between the sliding part 10 and the pressure sensing part 2.
上記のように構成された圧力センサにおいては、従来の
圧力伝達液６の容量と比較してこの実施例での圧力伝達
液１１の容量は極端に小さくなっており、例えば圧力セ
ンサの周囲の温度上昇に応じて圧力伝達液１１の体積は
膨張するが、その膨張量は従来の圧力伝達液６と比較し
て極端に小さい、また、圧力伝達液１１の膨張に伴い、
圧力伝達液１１よりも熱膨張係数の小さなり−ス１も熱
膨張することから、圧力伝達液１１が温度上昇により体
′ｆ！Ｉｗ張した場合でも、その膨張量はケース１の熱
膨張に吸収される結果、圧力伝達液１１は圧力上昇せず
、圧力センサの周囲の温度上昇で圧力検知部２が燃焼室
内の圧力上昇として検知してしまうようなことは防止さ
れる。In the pressure sensor configured as described above, the capacity of the pressure transfer liquid 11 in this embodiment is extremely small compared to the capacity of the conventional pressure transfer liquid 6. For example, the temperature around the pressure sensor The volume of the pressure transmission fluid 11 expands in response to the rise, but the amount of expansion is extremely small compared to the conventional pressure transmission fluid 6. Also, as the pressure transmission fluid 11 expands,
Since the gas 1, which has a smaller coefficient of thermal expansion than the pressure transfer liquid 11, also expands thermally, the temperature of the pressure transfer liquid 11 increases and the body 'f! Even if Iw is expanded, the amount of expansion is absorbed by the thermal expansion of the case 1, so the pressure of the pressure transfer fluid 11 does not increase, and the pressure sensing part 2 detects the increase in the pressure inside the combustion chamber due to the temperature rise around the pressure sensor. This will prevent detection.
なお、上記実施例ではエンジンの燃焼室を検知するため
の圧力センサについて説明したが、この発明の圧力セン
サはその他にも適用することができることは勿論である
。また、圧力伝達液１１をダイアフラム５と摺動部１０
との間に封入してもよい。In the above embodiment, a pressure sensor for detecting the combustion chamber of an engine has been described, but it goes without saying that the pressure sensor of the present invention can be applied to other applications. Further, the pressure transmission fluid 11 is connected to the diaphragm 5 and the sliding part 10.
It may be enclosed between.
さらに、上記実施例では圧力検知部として半導体ストレ
ンゲージを用いた場合について説明したが、他にも例え
ば圧電素子を用いてもよい。さらにまた、圧力伝達液６
としてシリコンオイルを用いたが、高沸点の他の液体で
あってもよい。Further, in the above embodiments, a semiconductor strain gauge is used as the pressure detection section, but a piezoelectric element, for example, may also be used. Furthermore, the pressure transmission fluid 6
Although silicone oil was used as the liquid, other liquids with high boiling points may be used.
以上説明したように、この発明の圧力センナによれば、
圧力センサの周囲の温度変化に応じて圧力伝達液の木精
が変動した場合、その変動量は小さく、またその変動量
はケースの体積変動で吸収されることから、圧力伝達液
には圧力変動が生じず、周囲の温度変化による影響を受
けることなく正確に圧力が検知されるという効果がある
。As explained above, according to the pressure sensor of the present invention,
When the pressure transmission fluid's woody fluid fluctuates in response to temperature changes around the pressure sensor, the amount of fluctuation is small and is absorbed by the volume fluctuation of the case, so the pressure transmission fluid has no pressure fluctuations. This has the effect that pressure can be accurately detected without being affected by changes in ambient temperature.
第１図はこの発明の一実施例を示す縦断面図、第２図は
従来の圧力センサの一例を示す縦断面図である。
図において、１はケース、２は圧力検知部、５はダイア
フラム、７は圧力伝達室、１０は摺動部、１１は圧力伝
達液である。
なお、各図中、同一符号は同一または相当部分を示すも
のである。FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view showing an example of a conventional pressure sensor. In the figure, 1 is a case, 2 is a pressure detection part, 5 is a diaphragm, 7 is a pressure transmission chamber, 10 is a sliding part, and 11 is a pressure transmission liquid. In each figure, the same reference numerals indicate the same or corresponding parts.
Claims (1)
けられ圧力を検知する圧力検知部と、この圧力検知部と
前記ダイアフラムとの間に形成された圧力伝達室と、こ
の圧力伝達室に摺動自在に設けられた熱膨張係数の小さ
な摺動部と、前記圧力検知部と前記摺動部との間または
前記ダイアフラムと摺動部との間のいずれかに封入され
た圧力伝達液とを備えたことを特徴とする圧力センサ。A diaphragm provided in the case, a pressure detection part provided in the case to detect pressure, a pressure transmission chamber formed between the pressure detection part and the diaphragm, and a pressure transmission chamber slidable in the pressure transmission chamber. a sliding part with a small coefficient of thermal expansion provided in the pressure sensing part and the sliding part, and a pressure transmission liquid sealed either between the pressure sensing part and the sliding part or between the diaphragm and the sliding part. A pressure sensor characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27030689A JPH03134531A (en) | 1989-10-19 | 1989-10-19 | Pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27030689A JPH03134531A (en) | 1989-10-19 | 1989-10-19 | Pressure sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03134531A true JPH03134531A (en) | 1991-06-07 |
Family
ID=17484440
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27030689A Pending JPH03134531A (en) | 1989-10-19 | 1989-10-19 | Pressure sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03134531A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0650828A (en) * | 1992-07-31 | 1994-02-25 | A M I:Kk | Pressure receiver for measuring contact pressure |
-
1989
- 1989-10-19 JP JP27030689A patent/JPH03134531A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0650828A (en) * | 1992-07-31 | 1994-02-25 | A M I:Kk | Pressure receiver for measuring contact pressure |
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