JPS5935113A - Knock sensor - Google Patents

Knock sensor

Info

Publication number
JPS5935113A
JPS5935113A JP14576982A JP14576982A JPS5935113A JP S5935113 A JPS5935113 A JP S5935113A JP 14576982 A JP14576982 A JP 14576982A JP 14576982 A JP14576982 A JP 14576982A JP S5935113 A JPS5935113 A JP S5935113A
Authority
JP
Japan
Prior art keywords
knock sensor
alloy
content rate
nickel
content
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
Application number
JP14576982A
Other languages
Japanese (ja)
Inventor
Okinori Sakurada
桜田 興宣
Juhei Takahashi
寿平 高橋
Teruaki Masumoto
増本 輝昭
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP14576982A priority Critical patent/JPS5935113A/en
Publication of JPS5935113A publication Critical patent/JPS5935113A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L23/00Devices 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
    • G01L23/22Devices 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
    • G01L23/221Devices 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
    • G01L23/222Devices 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)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)

Abstract

PURPOSE:To obtain a knock sensor being stable for a change in temperature, by sticking piezoelectric ceramic on to a metal vibration plate formed of an iron-nickel alloy whose main constituents are iron and nickel and in which the content rate of nickel is 40-60%. CONSTITUTION:In an Fe-Ni alloy, the thermal expansion coefficient becomes minimum when the content rate of Ni is 30-40%, while this coefficient becomes larger as the content rate of Ni increases. According to the present invention, an Fe-Ni alloy is which the content rate of Ni is 40-60% is used for a metal vibraton plate. According to this constitution, the fluctuation of a resonant frequency due to a change in temperature can be reduced, and thus a knock sensor being stable for the change in temperature can be obtained.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は自動車等のエンジンの異常振動を検知するノッ
クセンサに関するものである。
DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a knock sensor for detecting abnormal vibrations of an engine of an automobile or the like.

従来例の構成とその問題点 第1図は従来のノックセンサの要部を示している。第1
図において、1は基板、2,2′は基板1上に固定され
た支持片、3は支持片2,2′上に振動可能に支持され
た金属振動板、4は金属振動板3上に貼り合せられた圧
電セラミックである。この圧電セラミック4の上面、下
面には焼付等によ27・ −・ り電極が設けらn、でいる。5は基板1の直通孔(図示
せず)内に絶縁材で保持さ几たピンであり、このピン5
の一端は基板1の下面より突出している。6は圧電セラ
ミック4の電極に接続さ、t′l−た金属リード箔であ
り、この金属リード箔6の一端は上記ピン6に接続さ几
ている。第1図に示す基板1等は、エンジンに取付けら
几る筐体内に収納さ几る0 エンジンの振動は筐体、基板1を介して、金属振動板3
.圧電セラミック4に伝わる結果、圧電セラミック4の
電極間にエンジンの振動に応じた電気信号が発生する。
Structure of the conventional example and its problems FIG. 1 shows the main parts of a conventional knock sensor. 1st
In the figure, 1 is a substrate, 2 and 2' are supporting pieces fixed on the substrate 1, 3 is a metal diaphragm that is vibrably supported on the support pieces 2 and 2', and 4 is a metal diaphragm that is supported on the metal diaphragm 3. It is a bonded piezoelectric ceramic. 27.-- electrodes are provided on the upper and lower surfaces of the piezoelectric ceramic 4 by baking or the like. 5 is a pin held in a through hole (not shown) of the substrate 1 with an insulating material;
One end protrudes from the bottom surface of the substrate 1. A metal lead foil 6 is connected to the electrode of the piezoelectric ceramic 4, and one end of the metal lead foil 6 is connected to the pin 6. The board 1 shown in FIG.
.. As a result of being transmitted to the piezoelectric ceramic 4, an electric signal corresponding to engine vibration is generated between the electrodes of the piezoelectric ceramic 4.

この電気信号波形を観測することにより、エンジンの異
常振動が検出できる。
By observing this electrical signal waveform, abnormal engine vibrations can be detected.

上記従来例においては、金属振動板3としてメッキさf
した鉄等が用いら肛ていた。しかしながら鉄からなる金
属振動板3の熱膨張係数は13×10 程度であり、圧
電セラミック4の熱膨張係数(10X10下6)に比較
して太きいために、共振周波数が周囲の温度変化によっ
て大きく変動する欠点があった。
In the above conventional example, the metal diaphragm 3 is plated with f.
Iron, etc., were used in the anus. However, the thermal expansion coefficient of the metal diaphragm 3 made of iron is about 13×10 2 , which is larger than that of the piezoelectric ceramic 4 (10×10 lower 6), so the resonance frequency increases due to changes in the surrounding temperature. There was a variable drawback.

3ベーソ 発明の1」的 本発明け、温度が変化しても共振周波数の変動が小さい
ノックセンサを提供することを目的とするものである。
SUMMARY OF THE INVENTION An object of the present invention is to provide a knock sensor whose resonant frequency is less likely to fluctuate even when the temperature changes.

発明の構成 本発明に、−ト記目的を達成するために、ニッケル(N
i)と鉄(Fe )とを主成分とするFa−Ni合金の
内で、N1の含有率(wt%)が4o〜6゜係のFe−
Ni合金全金属振動板として使用することを特徴とする
ものである。
Structure of the Invention In order to achieve the above objects, the present invention uses nickel (N
i) and iron (Fe) as the main components, Fe-
It is characterized by being used as a Ni alloy all-metal diaphragm.

実施例の説明 第2図ばFe −Ni合金のNi含有率と熱膨張係数と
の関係を示している。第2図からも明らかなように、F
e −Ni合金においては、N1含有率が30〜40%
において、熱膨張係数が最少となり、Ni含有率が大き
くなると熱膨張係数が大きくなる。本発明は、Ni含有
率が40〜60係のFe −Ni合金を金属振動板4と
して使用するものである。本発明者らの実験によ几ば、
Fe −Ni合金のN1含有率が60%’(z越すと、
共振周波数の温度特性が劣化するとともに溶接しにくく
なり、捷たN1含有率が40係より小さくなると、錆び
易いものである。才たN1含有率が40〜60%のFe
 −Ni合金は、振動減衰係数が太きいため、ノックセ
ンサの共振のQが小さく感度が良好となるものである。
DESCRIPTION OF THE EMBODIMENTS FIG. 2 shows the relationship between the Ni content and the thermal expansion coefficient of the Fe--Ni alloy. As is clear from Figure 2, F
In the e-Ni alloy, the N1 content is 30-40%
, the thermal expansion coefficient is the minimum, and as the Ni content increases, the thermal expansion coefficient increases. In the present invention, a Fe--Ni alloy with a Ni content of 40 to 60 is used as the metal diaphragm 4. According to the experiments of the present inventors,
When the N1 content of the Fe-Ni alloy exceeds 60%' (z
As the temperature characteristics of the resonant frequency deteriorate, it becomes difficult to weld, and when the N1 content of the sludge is less than 40, it is likely to rust. Fe with an N1 content of 40 to 60%
-Ni alloy has a large vibration damping coefficient, so the resonance Q of the knock sensor is small and the sensitivity is good.

なお、N1含有率が40〜60%CQ Fe −Ni合
金とシテは、PB(Ni含有率45%)、N−50(N
i含有率50) 、N −52(Ni含有率52多)等
がある。なお、N1含有率が78係のPCは熱膨張係数
が太きく共振周波数の温度特性が劣化するものである。
In addition, CQ Fe-Ni alloy with N1 content of 40 to 60% and shite are PB (Ni content of 45%), N-50 (N
Ni content: 50), N-52 (Ni content: 52%), etc. Note that PC with an N1 content of 78 coefficients has a large coefficient of thermal expansion and deteriorates the temperature characteristics of the resonance frequency.

発明の効果 本発明は」二記のような構成であり、本発明によ几ば、
温度変化による共振周波数の変動を小さくすることがで
き、温度変化に対して安定したノックセンサが得ら几る
利点を有するものである。
Effects of the Invention The present invention has the structure as described in Section 2, and according to the present invention,
This has the advantage that fluctuations in resonance frequency due to temperature changes can be reduced, and a knock sensor that is stable against temperature changes can be obtained.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は従来のノックセンサの要部の斜視図、第2図は
Fa−Ni合金のN1含有率に対する熱膨張係数の関係
を示す図である。 6ベージ ト・・・・・基板、2,2′・・・・・・支持片、3・
・・・・・金属振動板、4・・・・・・圧電セラミック
、5・・・・・・ピン、6・・・・・・金属リード箔。 代理人の氏名 弁理士 中 尾 敏 男 ほか1名第1
図 第2図 Nf  壱・有量    (−躯)
FIG. 1 is a perspective view of the main parts of a conventional knock sensor, and FIG. 2 is a diagram showing the relationship between the coefficient of thermal expansion and the N1 content of an Fa-Ni alloy. 6Baget...Substrate, 2,2'...Support piece, 3.
...Metal diaphragm, 4...Piezoelectric ceramic, 5...Pin, 6...Metal lead foil. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Nf 1/Amount (-body)

Claims (1)

【特許請求の範囲】[Claims] 鉄とニッケルとを主成分としニッケルの含有率が40〜
60擾の鉄ニツケル合金からなる金属振動板を振動可能
に支持するとともに、上記金属振動板に圧電セラミック
を貼り合わせてなるノックセンサ。
The main ingredients are iron and nickel, and the nickel content is 40~
A knock sensor that supports a metal diaphragm made of a 60 mm iron-nickel alloy so that it can vibrate, and also has a piezoelectric ceramic bonded to the metal diaphragm.
JP14576982A 1982-08-23 1982-08-23 Knock sensor Pending JPS5935113A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14576982A JPS5935113A (en) 1982-08-23 1982-08-23 Knock sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14576982A JPS5935113A (en) 1982-08-23 1982-08-23 Knock sensor

Publications (1)

Publication Number Publication Date
JPS5935113A true JPS5935113A (en) 1984-02-25

Family

ID=15392732

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14576982A Pending JPS5935113A (en) 1982-08-23 1982-08-23 Knock sensor

Country Status (1)

Country Link
JP (1) JPS5935113A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62230710A (en) * 1986-03-31 1987-10-09 Nitto Electric Ind Co Ltd Hair tonic composition

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5772020A (en) * 1980-10-23 1982-05-06 Japan Electronic Control Syst Co Ltd Vibration detector

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5772020A (en) * 1980-10-23 1982-05-06 Japan Electronic Control Syst Co Ltd Vibration detector

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62230710A (en) * 1986-03-31 1987-10-09 Nitto Electric Ind Co Ltd Hair tonic composition

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