JPH0692784B2 - Ignition timing control device for internal combustion engine - Google Patents
Ignition timing control device for internal combustion engineInfo
- Publication number
- JPH0692784B2 JPH0692784B2 JP58134945A JP13494583A JPH0692784B2 JP H0692784 B2 JPH0692784 B2 JP H0692784B2 JP 58134945 A JP58134945 A JP 58134945A JP 13494583 A JP13494583 A JP 13494583A JP H0692784 B2 JPH0692784 B2 JP H0692784B2
- Authority
- JP
- Japan
- Prior art keywords
- knocking
- ignition timing
- timing control
- detector
- voltage
- 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 - Lifetime
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P5/00—Advancing or retarding ignition; Control therefor
- F02P5/04—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
- F02P5/145—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions using electrical means
- F02P5/15—Digital data processing
- F02P5/152—Digital data processing dependent on pinking
- F02P5/1526—Digital data processing dependent on pinking with means for taking into account incorrect functioning of the pinking sensor or of the electrical means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Testing Of Engines (AREA)
- Electrical Control Of Ignition Timing (AREA)
Description
【発明の詳細な説明】 本発明は、内燃機関の気筒内圧力変動によって気筒内外
に生じる振動もしくは音等によってノッキングを検出
し、ノッキング信号が生じた時遅角させる機能をもつ内
燃機関用点火時期制御装置に関するものである。The present invention relates to an ignition timing for an internal combustion engine having a function of detecting knocking by vibrations or sounds generated inside and outside the cylinder due to pressure fluctuations in the cylinder of the internal combustion engine, and delaying the knocking signal when the knocking signal occurs. The present invention relates to a control device.
従来の点火時期制御装置は、ノッキング検出器が故障し
た場合には、ノッキング検出が出来なくなり、点火時期
が進角してエンジンが損傷してしまうことがあるために
ノッキング検出器の故障検出を行なっている。ところ
が、ノック検出器に圧電素子が使われている場合には、
圧電素子自体が直流的に断線状態にあり断線検出ができ
なかった。そのため、機関の運転下での検出器の出力信
号レベルを監視して、その信号レベルが正常時より小さ
くなるかゼロになった場合に故障としていた。しかし、
この方法は、機関本体の振動を基準としているため、機
関振動の個体毎のバラツキが大きく、かつ機関低速回転
時や機関停止時には機関振動が小さいので、ノッキング
検出器により検出される機関振動レベルが極小となり、
正確な故障検出が出来なかった。When the knocking detector fails, the conventional ignition timing control device cannot detect the knocking and may advance the ignition timing to damage the engine. ing. However, if a piezoelectric element is used in the knock detector,
The piezoelectric element itself was in a direct current disconnection state, and the disconnection could not be detected. Therefore, the output signal level of the detector during operation of the engine is monitored, and when the signal level becomes lower than normal or becomes zero, it is considered as a failure. But,
Since this method is based on the vibration of the engine itself, the variation in engine vibration among individuals is large, and the engine vibration is small when the engine is running at low speed or when the engine is stopped, so the engine vibration level detected by the knocking detector is Becomes extremely small,
I could not detect the failure accurately.
本発明は、この圧電素子を使ったノッキング検出器の断
線故障検出を精度良く行なうことを目的としたものであ
る。つまり、点火時期制御装置からノッキング検出器へ
電圧信号を発生し、その信号が加わった時、あるいはカ
ットされた時の充電電圧（または放電電圧）の変化を測
定して故障検出を行なうものである。これは、ノッキン
グ検出器が容量分（キャパシティ）を持つため正常時と
故障断線時の容量に大きな差が生じる点に着目したもの
である。An object of the present invention is to accurately detect a disconnection failure of a knocking detector using this piezoelectric element. In other words, a voltage signal is generated from the ignition timing control device to the knocking detector, and a change in the charging voltage (or discharging voltage) when the signal is applied or cut is measured to detect a failure. . This is because the knocking detector has a capacity (capacity), so that there is a large difference in capacity between a normal state and a broken wire.
即ち、ノッキング検出器に一定電圧を印加した場合の充
電特性（または電圧カット後の放電特性）の相違を測定
すれば、ノッキング検出器及びその間の配線が、正常か
故障かが確実に検出できる。また、印加電圧を大きくす
れば、充放電電圧の変化も大きくなるので、特別の増幅
器等が不要となり、機関の影響も受けない。That is, by measuring the difference in charge characteristics (or discharge characteristics after voltage cut) when a constant voltage is applied to the knocking detector, it is possible to reliably detect whether the knocking detector and the wiring between them are normal or defective. Further, if the applied voltage is increased, the change in the charging / discharging voltage is also increased, so that a special amplifier or the like is not required and the influence of the engine is not exerted.
本発明の構成を以下説明する。第１図に一実施例のブロ
ック図を示す。第１図において、１は圧電素子よりなる
ノッキング検出器であり、内燃機関のノッキングに基づ
く機関本体の振動または音波を検出する。２はノッキン
グ検出器の出力信号を、点火時期制御装置に伝えるシー
ルド線である。３は、ノッキング検出器の信号からノッ
キングの有無を検出し、点火時期を決定する点火時期制
御装置である。４は点火時期制御装置により決定された
点火時期に基づいて点火コイルに点火信号を送るイグナ
イタである。The structure of the present invention will be described below. FIG. 1 shows a block diagram of one embodiment. In FIG. 1, reference numeral 1 denotes a knocking detector composed of a piezoelectric element, which detects vibrations or sound waves of the engine body due to knocking of the internal combustion engine. Reference numeral 2 is a shield wire for transmitting the output signal of the knocking detector to the ignition timing control device. Reference numeral 3 is an ignition timing control device that detects the presence or absence of knocking from the signal from the knocking detector and determines the ignition timing. An igniter 4 sends an ignition signal to the ignition coil based on the ignition timing determined by the ignition timing control device.
点火時期制御装置は以下に述べる様に構成される。まず
３−１は切替スイッチであり、後述の１チップマイクロ
コンピュータ（以下１チップマイコン）の命令により開
閉される。通常のノック検出時においては、切替スイッ
チ３−１は第１図のα側つまり検出器の信号が次のバン
ドパスフィルタ（B,P,F）３−２を通り、１チップマイ
コン内臓のAD変換器の入力端子に入る様に接続される。
検出器の故障検出を行なう場合には、ノッキング検出器
１に電圧パルスを印加するため、切替スイッチはβ側と
なり、直流電圧（たとえば5V）がセンサに加えられる。The ignition timing control device is configured as described below. First, 3-1 is a changeover switch, which is opened / closed by a command of a one-chip microcomputer (hereinafter, one-chip microcomputer) described later. During normal knock detection, the changeover switch 3-1 passes through the band pass filter (B, P, F) 3-2 shown in FIG. Connected so as to enter the input terminal of the converter.
When a detector failure is detected, a voltage pulse is applied to the knocking detector 1, so the changeover switch is on the β side, and a DC voltage (for example, 5V) is applied to the sensor.
３−２はバンドパスフィルスタでありノッキング信号以
外の不要な信号を除去する。３−３ノッキング検出、点
火時期演算を行なう１チップマイクロコンピュータであ
り、複数のアナログ入力信号、デジタル入出力端子を備
えている。３、４は１チップマイコン３−３によって演
算された点火時期の補正量をアナログ電圧に変換するDA
変換期である。３−５はアナログ電圧に変換された点火
時期信号を点火装置をなすイグナイタ４に送るための電
圧−電流変換器である。A band pass filter 3-2 removes unnecessary signals other than the knocking signal. 3-3 A one-chip microcomputer that performs knocking detection and ignition timing calculation, and has a plurality of analog input signals and digital input / output terminals. DAs 3 and 4 convert the correction amount of the ignition timing calculated by the 1-chip microcomputer 3-3 into an analog voltage.
It is a conversion period. Reference numeral 3-5 is a voltage-current converter for sending the ignition timing signal converted into an analog voltage to the igniter 4 forming the ignition device.
次に、本発明の中心となるノッキング検出器の故障検出
について詳細に説明する。圧電素子を用いたノッキング
検出装置は、第２図のように等価的には容積分（キャパ
シティ）をもっており、通常500PF〜1000PF程度であ
る。さらに、点火時期制御装置３からみて、ノッキング
検出器１との間にシールド線が接続されており、これに
は第２図のように分布容量をもっている。このシード線
の容量は、シールド線の材質と長さによって決定され
る。実際の機関に取付けた場合には、長さは2m程度とな
り、約500PFとなる。このように、ノッキング検出器１
とシールド線の全容量CTは、検出器の容量CSが1000PFの
ものを用いた場合1500PFとなる。しかし、ノッキング検
出器が故障・断線した場合には、検出器の容量CSがなく
なり、シールド線だけとなるため全容量CTは500PFとな
る。この容量変化を調べれば、故障断線か正常かがわか
る。Next, the failure detection of the knocking detector, which is the core of the present invention, will be described in detail. A knocking detection device using a piezoelectric element has a volume equivalent (capacity) as shown in FIG. 2, and is usually about 500PF to 1000PF. Further, as seen from the ignition timing control device 3, a shield wire is connected to the knocking detector 1 and has a distributed capacitance as shown in FIG. The capacity of the seed wire is determined by the material and length of the shield wire. When installed in an actual engine, the length is about 2 m, which is about 500 PF. In this way, the knocking detector 1
And the total capacitance C T of the shielded wire is 1500 PF when the detector has a capacitance C S of 1000 PF. However, if the knocking detector fails or is broken, the capacitance C S of the detector disappears and only the shield line is provided, so the total capacitance C T becomes 500 PF. By examining this change in capacity, it can be seen whether the wire is broken or normal.
そこで、点火時期制御装置３は、故障検出が必要になっ
た時に、（内燃機関の停止時、動作時のずれでも任意に
設定可能）１チップマイコン３−３は切替スイッチ３−
１に接続されている出力ポートをHighレベルにして、第
３図（ａ）のように切替スイッチ３−１をβ側に接続す
る。β側にすると、直流電圧（例えば5V）がノッキング
検出器に加えられる。しばらくして、出力ポートをLow
レベルにして切替スイッチ３−１をα側にすると直流電
圧が遮断されるため、ノッキング検出器の電圧はその容
量分により徐々に放電をする。このときの放電特性の時
定数は、ノッキング検出器とシールド線の全容量CTとB,
P,F,3−２の入力インピーダンスRiによって決定され
る。つまり、時定数はCTとRiの積で表わされるから、ノ
ッキング検出器の故障・断線時のように全容量が小さく
なれば時定数も小さくなり、第３図（ｂ）に示す正常時
に比べて第３図（ｃ）のごとくすばやく放電する。Therefore, in the ignition timing control device 3, when it is necessary to detect a failure (which can be arbitrarily set even when the internal combustion engine is stopped or at the time of operation), the one-chip microcomputer 3-3 has a changeover switch 3-.
The output port connected to 1 is set to the high level, and the changeover switch 3-1 is connected to the β side as shown in FIG. On the β side, a DC voltage (eg 5V) is applied to the knocking detector. After a while, the output port goes low
When the level of the changeover switch 3-1 is set to the α side, the DC voltage is cut off, so that the voltage of the knocking detector gradually discharges due to its capacity. The time constant of the discharge characteristic at this time is the total capacitance C T and B of the knocking detector and the shield wire,
Determined by the input impedance Ri of P, F, 3-2. In other words, since the time constant is represented by the product of C T and Ri, the time constant becomes smaller as the total capacitance becomes smaller, such as when the knocking detector fails or becomes disconnected, compared to the normal time shown in Fig. 3 (b). As shown in FIG. 3 (c), the battery is discharged quickly.
そこで、１チップマイコンは、切替スイッチ３−１をα
側に倒してから、一定時間後（例えば50μsec）に第３
図（ｄ）に示すように内蔵のAD変換器（アナログ−デジ
タル変換器）によりマイコンがその電圧を直接読みと
る。その読みとり電圧が高ければ（例えば2V以上）、ノ
ッキング検出器は正常であり低い電圧であれば故障であ
ると判断する。この処理を行なうサブルーチンのフロー
チャートを第４図に示す。この第４図の実施例では、一
定の直流電圧をノッキング検出器１に加え、その所定時
間経過後の電圧が、ある値より高いときにノッキング検
出器１が正常であると判断する（電圧が低い時、異常で
あると判断する）ものであるため、内燃機関の停止時の
ようにノッキング検出器１により機関振動が検出されて
いない時でもノッキング検出器１の異常検出ができるこ
とは勿論であるが、ノッキング検出器１が正常で、かつ
通常の運転状態で機関に振動が発生している時に故障検
出を行って、一ての直流電圧に振動による電圧が重畳し
ても、ノッキング検出器１が正常であれば、所定値以上
の電圧が生じ、異常のときのみ電圧が所定値以下となる
ため、正確にノッキング検出器１の故障判定ができる。Therefore, the 1-chip microcomputer sets the changeover switch 3-1 to α
After tilting to the side, after a certain time (for example, 50 μsec), the third
As shown in FIG. 3D, the microcomputer directly reads the voltage by the built-in AD converter (analog-digital converter). If the reading voltage is high (for example, 2 V or more), the knocking detector is normal, and if the reading voltage is low, it is determined that the knocking detector is defective. FIG. 4 shows a flowchart of a subroutine for performing this processing. In the embodiment of FIG. 4, a constant DC voltage is applied to the knocking detector 1, and when the voltage after a predetermined time has elapsed is higher than a certain value, it is determined that the knocking detector 1 is normal (the voltage is Since it is determined to be abnormal when it is low), it is of course possible to detect the abnormality of the knocking detector 1 even when the engine vibration is not detected by the knocking detector 1 such as when the internal combustion engine is stopped. However, even if the knocking detector 1 is normal and the failure is detected when the engine is vibrating in a normal operating state, and the voltage due to the vibration is superposed on one DC voltage, the knocking detector 1 Is normal, a voltage equal to or higher than a predetermined value is generated, and the voltage is equal to or lower than the predetermined value only in the case of an abnormality, so that the knocking detector 1 can be accurately determined for failure.
なお、上記の実施例は放電時の電圧変化を検出している
が、もちろん充電時の電圧変化を用いても同様である。Although the above embodiment detects the voltage change at the time of discharging, the same is true if the voltage change at the time of charging is used.
次に本発明の他の実施例について以下説明する。この実
施例の故障検出ルーチンのフローチャートを第５図に示
す。回路は、上記の実施例ともったく同じであるので省
略する。この実施例は、上記実施例の放電（または充
電）特性を検出する処理とさらに、ノック検出の際に作
成されたノッキング判定レベルの大小によって故障検出
する処理とを組み合わせたものである。つまり、機関が
動作していて高速回転になり機関本体の機械振動が極め
て大きくなった場合にノッキング検出器の出力信号レベ
ルも大きくなるために容易にノッキング検出器の故障、
さらに劣化を判定できる。そこで、点火時期制御装置３
内の１チップマイコンは、ノッキング検出のためにノッ
キング検出器の出力信号を平均化処理し、それによりノ
ッキング判定レベルを作成している。こノッキング判定
レベンルの大きさを検出し、設定レベル（例えば0.5V）
以下であれば、故障であるとする。この判定レベルの大
きさによる故障検出と上記実施例の放電による故障検出
の結果の論理和（OR）をとることにより、さらに確実に
故障を検出できる。このように第５図の実施例では、一
定の直流電圧をノッキング検出器１に加え、その所定時
間経過後の電圧が、ある値より高いときにノッキング検
出器１が正常であると判断する（電圧が低い時、異常で
あると判断する）ものであるため、ノッキング検出器１
が正常で、かつ通常の運転状態で機関に振動が発生して
いる時に故障検出を行って、一定の直流電圧に振動によ
る電圧が重畳しても、ノッキング検出器１が正常であれ
ば、所定値以上の電圧が生じ、異常のときのみ電圧が所
定値以下となるため、正確にノッキング検出器１の故障
判定ができる。Next, another embodiment of the present invention will be described below. A flow chart of the failure detection routine of this embodiment is shown in FIG. The circuit is the same as that of the above-described embodiment, and therefore its explanation is omitted. This embodiment is a combination of the process of detecting the discharge (or charge) characteristic of the above embodiment and the process of detecting a failure depending on the magnitude of the knocking determination level created at the time of knock detection. In other words, when the engine is operating and rotating at high speed and the mechanical vibration of the engine body becomes extremely large, the output signal level of the knocking detector also becomes large, so that the knocking detector easily fails,
Further deterioration can be determined. Therefore, the ignition timing control device 3
The one-chip microcomputer therein averages the output signals of the knocking detector to detect knocking, thereby creating a knocking determination level. Knocking detection The level of the level is detected and the set level (for example, 0.5V)
If it is below, it is considered to be a failure. By taking the logical sum (OR) of the results of the fault detection based on the magnitude of this judgment level and the fault detection due to the discharge in the above embodiment, the fault can be detected more reliably. As described above, in the embodiment shown in FIG. 5, a constant DC voltage is applied to the knocking detector 1, and when the voltage after the lapse of a predetermined time is higher than a certain value, it is judged that the knocking detector 1 is normal ( When the voltage is low, it is judged to be abnormal), so the knocking detector 1
If the knocking detector 1 is normal even if the voltage due to the vibration is superimposed on the constant DC voltage by detecting the failure while the engine is normal and vibration is generated in the engine under normal operating conditions, A voltage equal to or higher than the value is generated, and the voltage becomes equal to or lower than the predetermined value only when there is an abnormality, so that the failure of the knocking detector 1 can be accurately determined.
以上述べたように本発明は、ノッキング検出器に一時的
に直流電圧を加え、その充電あるいは放電特性を検出し
てノッキング検出器の故障を判別するようにしているの
で、検出器の出力信号レベルを監視するもののように、
機関振動の個体毎のバラツキ等の影響は受けず、精度良
くノッキング検出器の故障を検出できる。As described above, according to the present invention, a DC voltage is temporarily applied to the knocking detector, and its charging or discharging characteristic is detected to determine the failure of the knocking detector. Like the ones that monitor
The knocking detector can be accurately detected without being affected by variations in engine vibration among individuals.
第１図は本発明の一実施例を示す全体構成図、第２図は
第１図中のノッキング検出器および接続線の等価回路
図、第３図は故障検出の方法を説明するためのタイミン
グチャート、第４図は故障検出の処理手順を示すフロー
チャート、第５図は本発明の他の実施例における故障検
出の処理手順を示すフローチャートである。 １……ノッキング検出器,2……シールド線,3……点火時
期制御装置,3−１……切替スイッチ,3−２……バンドパ
スフィルタ,3−３……１チップマイクロコンピュータ,4
……イグナイタ。FIG. 1 is an overall configuration diagram showing an embodiment of the present invention, FIG. 2 is an equivalent circuit diagram of the knocking detector and connection lines in FIG. 1, and FIG. 3 is a timing for explaining a failure detection method. A chart, FIG. 4 is a flowchart showing a failure detection processing procedure, and FIG. 5 is a flowchart showing a failure detection processing procedure in another embodiment of the present invention. 1 ... Knocking detector, 2 ... Shielded wire, 3 ... Ignition timing control device, 3-1 ... Changeover switch, 3-2 ... Bandpass filter, 3-3 ... 1-chip microcomputer, 4
...... Igniter.
Claims (2)
体又は外部の振動を検出するノッキング検出器と、前記
ノッキング検出器からの出力信号に応じて点火時期制御
信号を発生する点火時期制御回路と、前記点火時期制御
信号に応じて点火信号を発生する点火装置とを有する内
燃機関用点火時期制御装置において、この点火時期制御
回路は前記ノッキング検出器に一時的に直流電圧を加
え、その充電あるいは放電特性を検出して、この検出信
号から前記ノッキング検出器の故障を検出する故障検出
手段を備えたことを特徴とする内燃機関用点火時期制御
装置。1. A knocking detector for detecting vibration of the engine body or the outside based on a knocking phenomenon of an internal combustion engine, and an ignition timing control circuit for generating an ignition timing control signal according to an output signal from the knocking detector, In an ignition timing control device for an internal combustion engine having an ignition device that generates an ignition signal according to the ignition timing control signal, the ignition timing control circuit temporarily applies a DC voltage to the knocking detector to charge or discharge the knocking detector. An ignition timing control device for an internal combustion engine, comprising a failure detecting means for detecting a characteristic and detecting a failure of the knocking detector from the detection signal.
特性による故障検出とノッキング判定を行なうためのノ
ッキング判定レベルの大きさによる故障検出との論理和
で故障検出を行なうことを特徴とする特許請求の範囲第
１項記載の内燃機関用点火時期制御装置。2. The failure detection means performs failure detection by a logical sum of failure detection based on the charging or discharging characteristics and failure detection based on the magnitude of a knocking determination level for performing knocking determination. 2. An ignition timing control device for an internal combustion engine according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58134945A JPH0692784B2 (en) | 1983-07-22 | 1983-07-22 | Ignition timing control device for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58134945A JPH0692784B2 (en) | 1983-07-22 | 1983-07-22 | Ignition timing control device for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6026173A JPS6026173A (en) | 1985-02-09 |
| JPH0692784B2 true JPH0692784B2 (en) | 1994-11-16 |
Family
ID=15140231
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58134945A Expired - Lifetime JPH0692784B2 (en) | 1983-07-22 | 1983-07-22 | Ignition timing control device for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0692784B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9310412B2 (en) | 2012-01-20 | 2016-04-12 | Rosemount Inc. | Field device with self-testing of a piezoelectric transducer |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61218777A (en) * | 1985-03-25 | 1986-09-29 | Hitachi Ltd | Knock controller |
| JP4296124B2 (en) | 2004-05-12 | 2009-07-15 | 三菱電機株式会社 | Ignition timing control device for internal combustion engine |
| JP5432398B1 (en) * | 2012-10-31 | 2014-03-05 | 日本特殊陶業株式会社 | Ignition timing control device and ignition timing control system |
| WO2014185397A1 (en) * | 2013-05-13 | 2014-11-20 | ヘルスセンシング株式会社 | Method for detecting state of health of individual and device for detecting state of health of individual |
| JP6496354B2 (en) * | 2016-06-14 | 2019-04-03 | 日本特殊陶業株式会社 | Manufacturing method of knocking sensor |
| JP7400690B2 (en) * | 2020-10-22 | 2023-12-19 | 横河電機株式会社 | Diagnostic equipment and methods, and field devices |
-
1983
- 1983-07-22 JP JP58134945A patent/JPH0692784B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9310412B2 (en) | 2012-01-20 | 2016-04-12 | Rosemount Inc. | Field device with self-testing of a piezoelectric transducer |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6026173A (en) | 1985-02-09 |
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