JPS61209334A - Pressure detector - Google Patents
Pressure detectorInfo
- Publication number
- JPS61209334A JPS61209334A JP5124385A JP5124385A JPS61209334A JP S61209334 A JPS61209334 A JP S61209334A JP 5124385 A JP5124385 A JP 5124385A JP 5124385 A JP5124385 A JP 5124385A JP S61209334 A JPS61209334 A JP S61209334A
- Authority
- JP
- Japan
- Prior art keywords
- piezoelectric element
- capacitor
- temperature compensation
- pressure detector
- compensation capacitor
- 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
- 239000003990 capacitor Substances 0.000 claims abstract description 27
- 239000012212 insulator Substances 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 6
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 abstract description 4
- 239000000853 adhesive Substances 0.000 abstract description 2
- 230000001070 adhesive effect Effects 0.000 abstract description 2
- 238000002485 combustion reaction Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000036316 preload Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
- G01L23/08—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid operated electrically
- G01L23/10—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid operated electrically by pressure-sensitive members of the piezoelectric type
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
- G01L23/22—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines
- G01L23/221—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines for detecting or indicating knocks in internal combustion engines
- G01L23/222—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines for detecting or indicating knocks in internal combustion engines using piezoelectric devices
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、例えば内燃機関の燃焼室内の圧力を直接検出
するのに好適な圧力検出器に関するものであり、特に圧
電素子の温度変化による圧力検出感度の変化を補償する
温度補償用コンデンサの取り付は構造に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a pressure detector suitable for directly detecting, for example, the pressure inside the combustion chamber of an internal combustion engine, and particularly relates to a pressure detector suitable for directly detecting the pressure inside the combustion chamber of an internal combustion engine, and in particular, the present invention relates to a pressure detector suitable for directly detecting the pressure inside the combustion chamber of an internal combustion engine. The installation of a temperature compensation capacitor to compensate for changes in detection sensitivity is a structural concern.
（従来の技術）
従来、この種圧電型圧力検出器においては、第２図にそ
の電気回路図を示すように、圧電素子ＣＯからの出力を
インピーダンス変換回路に入力し、その出力信号を得て
いた。(Prior art) Conventionally, in this type of piezoelectric pressure detector, as shown in the electrical circuit diagram in Fig. 2, the output from the piezoelectric element CO is input to an impedance conversion circuit to obtain the output signal. Ta.
（発明が解決しようとする問題点）
しかし、この種の圧電素子をエンジンの制御系統に使用
する場合、この圧電素子の温度特性が悪いものであるた
め、圧力検出器としての使用環境、使用範囲に必然的に
制約を受けることになる。(Problem to be solved by the invention) However, when this type of piezoelectric element is used in an engine control system, the temperature characteristics of this piezoelectric element are poor, so the environment and range of use as a pressure detector are limited. will inevitably be subject to restrictions.
そこで、本発明では、第３図の実施例に示すように温度
補償用コンデンサＣ１を圧電素子Ｃｏと並列に接続する
ことにより圧力検出感度の温度補償を行え、しかもその
温度補償用コンデンサの搭載を良好に行えるようにした
圧力検出器を提供することを目的とする。Therefore, in the present invention, the pressure detection sensitivity can be temperature compensated by connecting the temperature compensation capacitor C1 in parallel with the piezoelectric element Co, as shown in the embodiment of FIG. It is an object of the present invention to provide a pressure detector that can perform satisfactorily.
（問題点を解決するための手段）
本発明は、温度補償用コンデンサを圧電素子と隣接して
積層できる形状、例えばリング状にしたものである。(Means for Solving the Problems) According to the present invention, a temperature compensating capacitor is formed into a shape that can be stacked adjacent to a piezoelectric element, for example, a ring shape.
（作 用）
本発明構造によれば、温度補償用コンデンサが圧電素子
と一体化されることにより、温度補償用コンデンサの温
度が圧電素子の温度と実質的に同じになり、温度補償の
効果を一層大きくできるものである。(Function) According to the structure of the present invention, since the temperature compensation capacitor is integrated with the piezoelectric element, the temperature of the temperature compensation capacitor becomes substantially the same as the temperature of the piezoelectric element, thereby improving the temperature compensation effect. It can be made even bigger.
（実施例）
以下、本発明を図に示す実施例について説明する。第１
図は本発明になる圧力検出器の一実施例の構成を示す要
部縦断面図、第３図は本発明による圧力検出器の等価回
路を示す回路図である。また、第４図は第１図図示の本
発明になる圧力検出器における圧電体及び温度補償用コ
ンデンサ部の拡大模式図、第５図は本発明になる圧力検
出器における温度補償用コンデンサの拡大斜視図で、本
発明になる圧力検出器は前記第３図図示の破線部分、即
ちセンサ部の構造に関するものである。(Example) Hereinafter, an example of the present invention shown in the drawings will be described. 1st
The figure is a longitudinal cross-sectional view of a main part showing the configuration of an embodiment of the pressure detector according to the present invention, and FIG. 3 is a circuit diagram showing an equivalent circuit of the pressure detector according to the present invention. Moreover, FIG. 4 is an enlarged schematic diagram of the piezoelectric body and temperature compensation capacitor part in the pressure detector according to the present invention shown in FIG. 1, and FIG. 5 is an enlarged view of the temperature compensation capacitor in the pressure detector according to the present invention. In the perspective view, the pressure sensor according to the present invention is related to the broken line portion shown in FIG. 3, that is, the structure of the sensor section.
第１図において、ダイヤフラム２はハウジング１に全周
溶接され、ダイヤフラム２が圧力を受は変形するとロッ
ド１０が上部に押し上げられる。In FIG. 1, a diaphragm 2 is welded to the housing 1 all around, and when the diaphragm 2 receives pressure and deforms, the rod 10 is pushed upward.
また第４図において、圧電体３および温度補償用コンデ
ンサ４には上・下部に電極がそれぞれ設けられており、
圧電体３の下部及び温度補償用コンデンサ４の上部電極
即ち接地電極３１．４１はそれぞれハウジング１へ接地
されている。圧電体３の上部及び温度補償用コンデンサ
４の下部電極即ち出力電極３２．４２は例えば導電性接
着剤などを用いて接続されてそれぞれ出力端子５となっ
ており、絶縁体８で絶縁されたリードワイヤ９と接続さ
れ、出力信号が取り出されるようになっている。又、圧
電体３及び温度補償用コンデンサ４はいずれも予荷重カ
バー７により予荷重が負荷されている上に、それぞれの
上・下部に設けられた電極がハウジング部１で導通して
しまわないように絶縁体６にて絶縁されている。第４図
において温度補償用コンデンサ４は、圧電体３と出力電
極３２．４２にて並列に接続されている。そして、温度
補償用コンデンサ４は第５図に示すようにリング状であ
る。Further, in FIG. 4, the piezoelectric body 3 and the temperature compensation capacitor 4 are provided with electrodes on the upper and lower sides, respectively.
The lower part of the piezoelectric body 3 and the upper electrode of the temperature compensation capacitor 4, that is, the ground electrodes 31 and 41, are each grounded to the housing 1. The upper electrode of the piezoelectric body 3 and the lower electrode of the temperature compensation capacitor 4, that is, the output electrode 32, 42, are connected using, for example, a conductive adhesive to form an output terminal 5, and a lead insulated with an insulator 8. It is connected to the wire 9 so that an output signal can be taken out. In addition, both the piezoelectric body 3 and the temperature compensation capacitor 4 are preloaded by a preload cover 7, and the electrodes provided at the top and bottom of each are prevented from being electrically connected in the housing part 1. It is insulated with an insulator 6. In FIG. 4, the temperature compensation capacitor 4 is connected in parallel to the piezoelectric body 3 at output electrodes 32 and 42. The temperature compensation capacitor 4 has a ring shape as shown in FIG.
そこで上記構成によると、ダイヤフラム２が圧力を受は
変形するとロッド１０が上部に押し上げられ、圧電体３
に応力が伝達され圧電効果により応力に応じた電荷が発
生する。この発生した電荷が圧電体３の出力電極３２よ
り・リードワイヤ９を通してインピーダンス変換回路に
入力される。第３図図示の破線部内の温度補償用コンデ
ンサＣ。Therefore, according to the above configuration, when the diaphragm 2 receives pressure and deforms, the rod 10 is pushed upward, and the piezoelectric body 3
Stress is transmitted to and a charge corresponding to the stress is generated due to the piezoelectric effect. This generated electric charge is input to the impedance conversion circuit from the output electrode 32 of the piezoelectric body 3 and through the lead wire 9. A temperature compensation capacitor C is shown within the broken line in FIG.
をリング状とし、第４図中の４１及び４２のように接地
電極及び出力電極を形成し、その温度が圧電体３と同じ
になるように圧電体３と一体化されている。この温度補
償用コンデンサ４は前述のようにリング状となっている
ため、出力端子５とハウジング１とを絶縁する絶縁体と
して役割をも果たしている。is formed into a ring shape, and a ground electrode and an output electrode are formed as shown at 41 and 42 in FIG. Since the temperature compensation capacitor 4 is ring-shaped as described above, it also plays a role as an insulator that insulates the output terminal 5 and the housing 1.
絶縁体６はアルミナ等のセラミック、絶縁ガラスペース
トを印刷、焼付してもよい。また、リードワイヤ９と出
力端子５との接続は半田付け、（ロウ付けのいずれでも
よい。また、金属板を圧電体３と温度補償用コンデンサ
４との間に入れ出力電極としてもよい。The insulator 6 may be printed or baked with ceramic such as alumina or insulating glass paste. The lead wire 9 and the output terminal 5 may be connected by either soldering or brazing.Alternatively, a metal plate may be inserted between the piezoelectric body 3 and the temperature compensation capacitor 4 to serve as the output electrode.
（発明の効果）
本発明になる圧力検出器においては、温度補償用コンデ
ンサをリング状に形成し、この温度補償用コンデンサを
圧電体と互いに隣接して設けたから、両者の温度が同じ
ようになり温度補償の効果が一層大きくなるという効果
が大である。(Effects of the Invention) In the pressure detector of the present invention, the temperature compensation capacitor is formed in a ring shape, and the temperature compensation capacitor is provided adjacent to the piezoelectric body, so that the temperatures of both are the same. This has the great effect of further increasing the effect of temperature compensation.
第１図は本発明になる圧力検出器の一実施例の構成を示
す要部縦断面図、第２図は従来の圧力検出器の回路図、
第３図は第１図図示の本発明になる圧力検出器の等価回
路図、第４図は第１図図示の本発明になる圧力検出器に
おける圧電体及び温度補償用コンデンサ部の拡大模式図
、第５図は本発明になる圧力検出器における温度補償用
コンデンサの拡大斜視図である。
１・・・ハウジング、２・・・ダイヤフラム、３・・・
圧電体く圧電素子）、４・・・温度補償用コンデンサ、
３１．４１・・・接地電極、３２．４２・・・出力電極
、５・・・出力端子、６・・・絶縁体、７・・・予荷重
カッ＼゛−１８・・・絶縁体、９・・・リードワイヤ、
１０・・・口・ノド。
代理人弁理士 岡 部 隆
第１図
第２図FIG. 1 is a vertical cross-sectional view of essential parts showing the configuration of an embodiment of the pressure detector according to the present invention, FIG. 2 is a circuit diagram of a conventional pressure detector,
FIG. 3 is an equivalent circuit diagram of the pressure detector according to the invention shown in FIG. , FIG. 5 is an enlarged perspective view of a temperature compensation capacitor in a pressure detector according to the present invention. 1...Housing, 2...Diaphragm, 3...
piezoelectric element), 4...temperature compensation capacitor,
31.41...Ground electrode, 32.42...Output electrode, 5...Output terminal, 6...Insulator, 7...Preload cup\-18...Insulator, 9 ...Lead wire,
10...mouth/throat. Representative Patent Attorney Takashi Okabe Figure 1 Figure 2
Claims (1)
補償用コンデンサを圧電素子と互いに隣接して設け、両
者を電気的に並列接続したことを特徴とする圧力検出器
。A pressure detector characterized in that a temperature compensation capacitor is formed in a ring shape, the temperature compensation capacitor is provided adjacent to a piezoelectric element, and the two are electrically connected in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5124385A JPS61209334A (en) | 1985-03-13 | 1985-03-13 | Pressure detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5124385A JPS61209334A (en) | 1985-03-13 | 1985-03-13 | Pressure detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61209334A true JPS61209334A (en) | 1986-09-17 |
Family
ID=12881505
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5124385A Pending JPS61209334A (en) | 1985-03-13 | 1985-03-13 | Pressure detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61209334A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04115042U (en) * | 1991-03-25 | 1992-10-12 | 日本電子機器株式会社 | Piezoelectric element |
| JPH053965U (en) * | 1991-06-28 | 1993-01-22 | 日本電子機器株式会社 | Pressure sensor |
| JPH0519937U (en) * | 1991-08-27 | 1993-03-12 | 日本電子機器株式会社 | Pressure sensor |
| JPH05284600A (en) * | 1992-04-03 | 1993-10-29 | Kunihiro Nagata | Piezoelectric-ceramics element |
| US6810746B2 (en) * | 2000-03-25 | 2004-11-02 | Robert Bosch Gmbh | Sensor arrangement with pressure detector and sensor circuit |
-
1985
- 1985-03-13 JP JP5124385A patent/JPS61209334A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04115042U (en) * | 1991-03-25 | 1992-10-12 | 日本電子機器株式会社 | Piezoelectric element |
| JPH053965U (en) * | 1991-06-28 | 1993-01-22 | 日本電子機器株式会社 | Pressure sensor |
| JPH0519937U (en) * | 1991-08-27 | 1993-03-12 | 日本電子機器株式会社 | Pressure sensor |
| JPH05284600A (en) * | 1992-04-03 | 1993-10-29 | Kunihiro Nagata | Piezoelectric-ceramics element |
| US6810746B2 (en) * | 2000-03-25 | 2004-11-02 | Robert Bosch Gmbh | Sensor arrangement with pressure detector and sensor circuit |
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