JPH0754622A - Detecting device for offset contact of exhaust valve - Google Patents
Detecting device for offset contact of exhaust valveInfo
- Publication number
- JPH0754622A JPH0754622A JP21820193A JP21820193A JPH0754622A JP H0754622 A JPH0754622 A JP H0754622A JP 21820193 A JP21820193 A JP 21820193A JP 21820193 A JP21820193 A JP 21820193A JP H0754622 A JPH0754622 A JP H0754622A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust valve
- offset contact
- sensor
- contact
- signal
- 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.)
- Withdrawn
Links
Landscapes
- Testing Of Engines (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は舶用ディーゼルエンジン
の排気弁片当り検出に適用される装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device applied to detection of exhaust valve piece contact in a marine diesel engine.
【０００２】[0002]
【従来の技術】従来は熟練乗組員が音を耳で聞き漏えい
を検知するものはあっても、（実願昭６２−０９９４２
４他）排気弁の片当りを検知する装置は存在しなかっ
た。2. Description of the Related Art Conventionally, although there is a device in which a skilled crew member hears a sound by ear and detects leakage, (Japanese Utility Model Application No. 62-09942).
4 etc.) There was no device to detect one-sided contact of the exhaust valve.
【０００３】[0003]
【発明が解決しようとする課題】排気弁片当りの検知は
従来熟練乗組員の耳に頼っているため、就寝時などには
排気弁の片当りが発生しても検知するのは不可能であっ
た。しかし、本発明によれば、エンジン運転中であれば
常時排気弁の片当たりの発生を監視することが可能とな
り、迅速な保守作業ができるようになる。前記のような
排気弁片当りが起るのは、排気弁開放後の取付状態の不
備や、排気弁のすり合わせ不良等のメンテナンス作業不
備に起因する場合が多く、本発明によればエンジンのメ
ンテナンス作業の不具合を早期に検知可能となる。Since the exhaust valve piece hit detection has hitherto depended on the ear of a skilled crew member, it is impossible to detect the exhaust valve hit even when the exhaust valve hits one side. there were. However, according to the present invention, it is possible to constantly monitor the occurrence of partial contact of the exhaust valve while the engine is operating, and it is possible to perform a quick maintenance work. The exhaust valve piece hitting as described above often occurs due to a defective installation state after the exhaust valve is opened, or defective maintenance work such as a poor exhaust valve misalignment. It becomes possible to detect work defects early.
【０００４】本発明の目的は、簡単な設備により排気弁
に片当たりが発生しているかどうかを常時自動的に監視
して、迅速な保守作業を実施できる排気弁片当り検出装
置を提供するにある。SUMMARY OF THE INVENTION An object of the present invention is to provide an exhaust valve piece contact detection device capable of performing a quick maintenance work by constantly and automatically monitoring whether or not the exhaust valve has a piece contact with a simple facility. is there.
【０００５】[0005]
【課題を解決するための手段】本発明の排気弁片当り検
出装置は、排気弁吹抜検知センサ１と排気弁の上死点を
検知するＴ．Ｄ．Ｃマークセンサ５と、該排気弁吹抜検
知センサ及びＴ．Ｄ．Ｃマークセンサからの信号を解析
し排気弁閉の瞬間から排気弁全閉までの信号を包絡線処
理し、包絡線波形のピーク回数、敷居値の通過回数及び
／又は微分値から排気弁の片当りを検出する演算装置４
とを有してなることを特徴としている。An exhaust valve piece contact detection device according to the present invention includes an exhaust valve blowout detection sensor 1 and a T.V. D. The C mark sensor 5, the exhaust valve blowout detection sensor and the T.C. D. The signal from the C mark sensor is analyzed, the signal from the moment the exhaust valve is closed to the time when the exhaust valve is fully closed is subjected to envelope processing, and the peak number of the envelope waveform, the number of times the threshold value has passed and / or the differential value is used to determine the exhaust valve segment. Arithmetic device 4 for detecting the hit
It is characterized by having and.
【０００６】[0006]
【作用】排気弁箱に取付けられた排気弁吹抜検知センサ
（加速度センサ）及び主機１２に取付けられたＴ．Ｄ．
Ｃマークセンサ５により検知した両信号を排気弁片当り
演算装置へ送る。該排気弁片当り演算装置では入力され
た信号を解析し、排気弁に片当りが発生している場合に
は、ディスプレイに表示するとともにエンジンモニタに
も信号を送る。The exhaust valve blow-out detection sensor (acceleration sensor) mounted on the exhaust valve box and the T.O. D.
Both signals detected by the C mark sensor 5 are sent to the arithmetic unit for each exhaust valve piece. The exhaust valve piece contact calculation device analyzes the input signal, and when the exhaust valve piece contact occurs, displays the signal on the display and also sends the signal to the engine monitor.
【０００７】追１） Ｔ．Ｄ．Ｃマークセンサ（Ｔｏｐ
Ｄｅａｄ Ｃｅｎｔｅｒ ＭａｒｋＳｅｎｓｏｒ）と
は、主機各ピストンの上死点を調べるセンサ５であり、
該センサは主機１２に、検知体はフライホイール１０に
取付られる（図５参照）。なお６シリンダエンジンの場
合、各シリンダの上死点はクランク角度３６０℃に対し
て６０℃ずつ位置がずれている。また燃焼は通常１−４
−３−６−２−５の順番で行われる。そこで１番シリン
ダが上死点に来たときに、Ｔ．Ｄ．Ｃマークセンサ５に
よりその位置の検知を行なえば、他のシリンダの位相は
１番シリンダの位相より６０℃ずつずらせばその上死点
位置が容易に求められる。Addendum 1) T. D. C mark sensor (Top
Dead Center Mark Sensor) is a sensor 5 for checking the top dead center of each piston of the main engine,
The sensor is attached to the main machine 12, and the detector is attached to the flywheel 10 (see FIG. 5). In the case of a 6-cylinder engine, the top dead center of each cylinder is displaced by 60 ° C with respect to the crank angle of 360 ° C. Also, combustion is usually 1-4
The order is -3-6-2-5. Then, when the first cylinder came to the top dead center, the T.I. D. If the position is detected by the C mark sensor 5, the top dead center position can be easily obtained by shifting the phases of the other cylinders by 60 ° from the phase of the first cylinder.
【０００８】[0008]
【実施例】以下図１〜６を参照し本発明の実施例につい
て説明する。図１は第１実施例のシステム構成図、 図
２は排気弁吹抜センサ取付け位置の一例図、図３は排気
弁片当り無しの信号波形図、図４は排気弁片当り有りの
信号波形図、図５はＴ．Ｄ．Ｃマークセンサ取付図、図
６は振動波形図である。図１において、１は排気弁吹抜
検知センサ、２はアンプ、３はＡ／Ｉボード、４は排気
弁片当り演算装置であり、排気弁箱１３に取り付けられ
た排気弁吹抜検知センサ１により計測された信号は、ア
ンプ２、Ａ／Ｉボード３を通じて排気弁片当り演算装置
４に入力される。又５はＴ．Ｄ．Ｃマークセンサ、６は
アンプ、７はＡ／Ｉボードであり、主機１２に取付けら
れたＴ．Ｄ．Ｃマークセンサ５により検出された信号は
アンプ６、Ａ／Ｉボード７を通じて排気弁片当り演算装
置４に入力される。該排気弁片当り演算装置では入力さ
れた信号を解析し、片当りが発生していれば何番シリン
ダが片当りしているかをディスプレイ９及びエンジンモ
ニタ８に表示する。Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 is a system configuration diagram of the first embodiment, FIG. 2 is an example of an exhaust valve blowout sensor mounting position, FIG. 3 is a signal waveform diagram without exhaust valve piece contact, and FIG. 4 is a signal waveform diagram with exhaust valve piece contact. , FIG. D. FIG. 6 is a vibration waveform diagram in which the C mark sensor is attached. In FIG. 1, reference numeral 1 is an exhaust valve blowout detection sensor, 2 is an amplifier, 3 is an A / I board, 4 is an exhaust valve piece contact arithmetic unit, and is measured by an exhaust valve blowout detection sensor 1 attached to an exhaust valve box 13. The generated signal is input to the exhaust valve piece per-calculation device 4 through the amplifier 2 and the A / I board 3. In addition, 5 is T. D. The C mark sensor, 6 is an amplifier, and 7 is an A / I board. D. The signal detected by the C mark sensor 5 is input to the exhaust valve piece per-calculation device 4 through the amplifier 6 and the A / I board 7. The exhaust valve piece contact calculation device analyzes the input signal and, if one piece has occurred, displays on the display 9 and the engine monitor 8 which cylinder is in contact with the other.
【０００９】次に排気弁片当り演算装置による片当り検
出の手法を示す。 （手法１） 包絡線処理後の排気弁吹抜検知センサ信号
の時間的変化線図において、排気弁閉の状態でのピーク
回数を調べ１回ならば図３のように排気弁片当り無しの
信号波形、２回以上ならば図４のように片当り有りを判
定する。 （手法２） 図３及び図４のように敷居値を設定し、１
ストロークにつき１回通過であれば片当り無し、２回以
上であれば片当り有りと判定する。Next, a method for detecting one-side contact by the exhaust valve one-side calculator will be described. (Method 1) In the time-varying diagram of the exhaust valve blowout detection sensor signal after the envelope processing, check the number of peaks when the exhaust valve is closed, and if it is once, the signal without exhaust valve hitting as shown in Fig. 3 If the waveform is twice or more, it is determined that there is one-sided contact as shown in FIG. (Method 2) Set the threshold value as shown in FIG. 3 and FIG.
If it passes once per stroke, it is determined that there is no one-sided contact, and if it passes twice or more, it is determined that one-sided contact exists.
【００１０】（手法３） 図３及び図４に示す包絡線の
傾きを調べ傾きが＋（プラス）の点が少くとも１回あれ
ば片当り有りと判定する。 （手法４） 上記手法１〜３のうち任意の２手法を組み
合せるか、手法１〜３のすべてを採用して判定する。 追２） ディーゼルエンジンは圧縮→爆発→排気→吸気
の工程を繰返す。この一連の動作中に爆発中の振動成
分、排気弁開中の振動成分、排気弁閉瞬間より全閉まで
の振動成分が排気弁加速度センサにより抽出される。だ
がこの３種の振動成分がどの振動成分であるかを判別す
る事が難しい。そこでＴ．Ｄ．Ｃマークセンサにより各
シリンダ毎の上死点を調べ上死点からの位相差により３
種の振動成分を区別する。(Method 3) The inclination of the envelope shown in FIGS. 3 and 4 is examined, and if there is at least one point where the inclination is + (plus), it is determined that there is one-sided contact. (Method 4) Any two of the above methods 1 to 3 are combined or all methods 1 to 3 are adopted for the determination. A2) The diesel engine repeats the process of compression → explosion → exhaust → intake. During this series of operations, the exhaust valve acceleration sensor extracts a vibration component during explosion, a vibration component during opening of the exhaust valve, and a vibration component from the moment when the exhaust valve is closed to the time when the exhaust valve is fully closed. However, it is difficult to determine which vibration component these three types of vibration components are. So T. D. Check the top dead center of each cylinder with the C mark sensor.
Distinguish the vibrational components of the species.
【００１１】[0011]
【発明の効果】本発明は前記のとおり構成したので、簡
単で低コストの機構により排気弁に片当りが起っていな
いかどうかを常時自動的に監視できる排気弁片当り検出
装置を提供することができる。Since the present invention is configured as described above, it provides an exhaust valve one-side contact detection device capable of constantly and automatically monitoring whether or not one-side contact has occurred in the exhaust valve by a simple and low-cost mechanism. be able to.
【図１】本発明の第１実施例に係るシステムの構成図FIG. 1 is a configuration diagram of a system according to a first embodiment of the present invention.
【図２】排気弁吹抜センサ取付け位置の一例図FIG. 2 is a diagram showing an example of an exhaust valve blowout sensor mounting position.
【図３】排気弁片当り無しの信号波形図[Fig. 3] Signal waveform diagram without exhaust valve piece contact
【図４】排気弁片当り有りの信号波形図FIG. 4 is a signal waveform diagram with exhaust valve piece contact.
【図５】Ｔ．Ｄ．Ｃマークセンサ取付図FIG. 5: T. D. C mark sensor installation drawing
【図６】振動波形図FIG. 6 Vibration waveform diagram
１…排気弁吹抜検知センサ、２…アンプ、３…Ａ／Ｉボ
ード、４…排気弁片当り演算装置、５…Ｔ．Ｄ．Ｃマー
クセンサ、６…アンプ、７…Ａ／Ｉボード、８…エンジ
ンモニタ、９…ディスプレイ。1 ... Exhaust valve blowout detection sensor, 2 ... Amplifier, 3 ... A / I board, 4 ... D. C mark sensor, 6 ... Amplifier, 7 ... A / I board, 8 ... Engine monitor, 9 ... Display.
Claims (1)
知センサ（１）と、排気弁の上死点を検知するＴ．Ｄ．
Ｃマークセンサ（５）と、該排気弁吹抜検知センサ及び
Ｔ．Ｄ．Ｃマークセンサからの信号を解析し排気弁閉の
瞬間から排気弁全閉までの信号を包絡線処理し、包絡線
波形のピーク回数、敷居値の通過回数及び／又は微分値
から排気弁の片当りを検出する演算装置（４）とを有し
てなる排気弁片当り検出装置。1. An exhaust valve blow-out detection sensor (1) attached to an exhaust valve box, and a T.V. D.
The C mark sensor (5), the exhaust valve blowout detection sensor, and the T.C. D. The signal from the C mark sensor is analyzed, the signal from the moment the exhaust valve is closed to the time when the exhaust valve is fully closed is subjected to envelope processing, and the peak number of the envelope waveform, the number of times the threshold value has passed and / or the differential value is used to determine the exhaust valve segment. An exhaust valve piece contact detection device comprising an arithmetic unit (4) for detecting contact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21820193A JPH0754622A (en) | 1993-08-10 | 1993-08-10 | Detecting device for offset contact of exhaust valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21820193A JPH0754622A (en) | 1993-08-10 | 1993-08-10 | Detecting device for offset contact of exhaust valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0754622A true JPH0754622A (en) | 1995-02-28 |
Family
ID=16716210
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21820193A Withdrawn JPH0754622A (en) | 1993-08-10 | 1993-08-10 | Detecting device for offset contact of exhaust valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0754622A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003214944A (en) * | 2002-01-29 | 2003-07-30 | Daihatsu Motor Co Ltd | Failure inspection device depending on abnormal noise |
| CN113279856A (en) * | 2021-07-02 | 2021-08-20 | 宁波市鄞州德来特技术有限公司 | Engine valve timing phase measuring method |
-
1993
- 1993-08-10 JP JP21820193A patent/JPH0754622A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003214944A (en) * | 2002-01-29 | 2003-07-30 | Daihatsu Motor Co Ltd | Failure inspection device depending on abnormal noise |
| CN113279856A (en) * | 2021-07-02 | 2021-08-20 | 宁波市鄞州德来特技术有限公司 | Engine valve timing phase measuring method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20001031 |