JPH0781932B2 - Exhaust valve failure diagnosis method - Google Patents
Exhaust valve failure diagnosis methodInfo
- Publication number
- JPH0781932B2 JPH0781932B2 JP62314244A JP31424487A JPH0781932B2 JP H0781932 B2 JPH0781932 B2 JP H0781932B2 JP 62314244 A JP62314244 A JP 62314244A JP 31424487 A JP31424487 A JP 31424487A JP H0781932 B2 JPH0781932 B2 JP H0781932B2
- Authority
- JP
- Japan
- Prior art keywords
- exhaust valve
- cylinder
- khz
- valve
- failure
- 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 - Fee Related
Links
- 238000000034 method Methods 0.000 title claims description 10
- 238000003745 diagnosis Methods 0.000 title description 6
- 238000001514 detection method Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 10
- 238000002485 combustion reaction Methods 0.000 description 6
- 230000002159 abnormal effect Effects 0.000 description 5
- 239000000446 fuel Substances 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
Landscapes
- Measuring Oxygen Concentration In Cells (AREA)
- Examining Or Testing Airtightness (AREA)
- Testing Of Engines (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明はディーゼル機関の排気弁の故障診断方法に関す
る。The present invention relates to a method for diagnosing a failure of an exhaust valve of a diesel engine.
第４〜５図を参照し従来形ディーゼル機関の排気弁故障
診断方法を説明する。An exhaust valve failure diagnosis method for a conventional diesel engine will be described with reference to FIGS.
第４図で01はディーゼル機関、02はシリンダ、03はイン
ジケータコック、04はシリンダNo.1のインジケータコッ
ク03に取り付けた圧力ピックアップ、04′はシリンダN
o.2のインジケータコックに取り付けたピックアップ、0
6はオシロスコープ、05と05′は厚くピック04,04′をそ
れぞれオシロスコープ06につなぐコードである。In FIG. 4, 01 is a diesel engine, 02 is a cylinder, 03 is an indicator cock, 04 is a pressure pickup attached to the indicator cock 03 of cylinder No. 1, and 04 'is a cylinder N.
Pickup attached to o.2 indicator cock, 0
6 is an oscilloscope, and 05 and 05 'are thick cords that connect the picks 04 and 04' to the oscilloscope 06, respectively.
第５図でオシロスコープ06は記憶された指圧図を示し、
図中実線は正常な指圧図であり、点線は異常な指圧図で
ある。In Fig. 5, the oscilloscope 06 shows the stored acupressure diagram,
In the figure, the solid line is a normal acupressure diagram, and the dotted line is an abnormal acupressure diagram.
ディーゼル機関の性能が異常を示した場合、例えば排気
温度が上昇したり、燃費が悪化した場合、指圧図を採取
し、それを標準値と比較し、全体的に低ければ排気弁に
異常ありと診断する。比較の方法としては、２チャンネ
ルのオシロスコープ06に２個のストレンゲージ式の圧力
ピックアップ04と04′をインジケータコック03に取り付
け、オシロスコープ06に表示される画像を互に重ね合わ
せることによって行なう。If the performance of the diesel engine shows abnormalities, for example, if the exhaust temperature rises or the fuel consumption deteriorates, collect a shiatsu chart and compare it with the standard value.If it is overall low, there is an abnormality in the exhaust valve. Diagnose. As a comparison method, two strain gauge type pressure pickups 04 and 04 'are attached to the indicator cock 03 in the two-channel oscilloscope 06, and the images displayed on the oscilloscope 06 are superimposed on each other.
いまNo.2シリンダの指圧図がNo.1シリンダを除く他のシ
リンダが指圧図とほぼ一致し、標準値と診断され、それ
が第５図の実線のようになり、その上にNo.1シリンダの
指圧図を重ね合わせたとき一致したときは、No.1シリン
ダの排気弁は異常なしと診断されるが、もし排気弁が故
障すると閉弁時でも筒内ガスが排気管の方にもれるの
で、点線のように正常な場合より低くなるので、そのと
きは異常ありと診断していた。Now, the Shiatsu diagram of No. 2 cylinder is almost the same as the Shiatsu diagram except for No. 1 cylinder, and it is diagnosed as the standard value, and it becomes like the solid line in Fig. 5, and on top of that, No. 1 If the cylinder pressure charts match when they overlap, the exhaust valve of No. 1 cylinder is diagnosed as normal, but if the exhaust valve fails, the in-cylinder gas will flow toward the exhaust pipe even when the valve is closed. Since it will be lower than in the normal case as indicated by the dotted line, at that time it was diagnosed as abnormal.
ところが２本の画像を目視で行なう方法は判断に主観が
入り、画像が小さいためかなり大きな差がなければ判断
できない。さらにストレンゲージ式ピックアップは温度
ドリフトがあるため、さらに精度が悪くなる。However, in the method of visually observing two images, the judgment is subjectivity, and since the images are small, it cannot be judged unless there is a considerable difference. Furthermore, the strain gauge type pickup has temperature drift, which further deteriorates the accuracy.
以上のような点より、従来方法ではかなり大きな故障が
ある場合でなければ故障を発見できない欠点があった。From the above points, the conventional method has a drawback that the failure cannot be detected unless there is a considerably large failure.
本発明の目的は前記従来装置の問題点を解消し、精度の
よい排気弁の故障診断方法を提供するにある。An object of the present invention is to solve the problems of the conventional device and to provide an accurate exhaust valve failure diagnosis method.
本発明に係る排気弁の故障診断方法は、ディーゼル機関
の排気弁104の弁座105の近くに音響センサ108を取り付
けると共に排気弁104の着座を検出する位置検出装置109
を設け、音響センサ108の出力信号中排気弁104の着座時
のセンサ出力信号を周波数分析し、分析された周波数成
分のうち10kHz〜40kHzの音圧を積算し、演算装置であら
かじめ記憶された正常値と比較判定することを特徴とし
ている。An exhaust valve failure diagnosis method according to the present invention includes a position detection device 109 for mounting a sound sensor 108 near a valve seat 105 of an exhaust valve 104 of a diesel engine and detecting seating of the exhaust valve 104.
By providing a frequency analysis of the sensor output signal when the exhaust valve 104 is seated in the output signal of the acoustic sensor 108, the sound pressure of 10 kHz to 40 kHz of the analyzed frequency components is integrated, and the normality stored in advance in the arithmetic unit is calculated. It is characterized by comparing and judging with the value.
前記方法は判定を演算によって行なうため、主観が入ら
ず正確な判断ができる。In the above method, since the judgment is made by calculation, the subjectivity is not included and the judgment can be made accurately.
以下第１〜３図を参照し本発明の一実施例について説明
する。An embodiment of the present invention will be described below with reference to FIGS.
第１図はユニフロー２サイクルエンジンの燃焼室付近の
断面図で、シリンダ２、シリンダカバー３、ピストン10
1により燃焼室102が形成されている。シリンダカバー３
のピストン101のセンタ直上には排気弁104と弁座105を
そなえた弁箱107が装着され、又該シリンダカバーの燃
焼室102外周付近には複数個の燃料噴射弁103が取り付け
られている。排気は排気弁開時にシリンダ出口106をへ
て外部に排出される。弁箱107の壁面には音響センサ108
が各シリンダに１個づつ取り付けられ、又排気弁104の
上部付近には排気弁104が着座しているかどうかを判別
する位置検出装置109が設けられている。さらに音響セ
ンサ110の入力が排気弁104が着座している期間のみ通過
させるゲート回路110と、音響センサ110の入力を周波数
分析する周波数分析器111と、10kHz〜40kHzの音圧を計
算し正常値か異常値かを判定する演算装置112と、表示
装置113が設けられている。FIG. 1 is a cross-sectional view of the vicinity of the combustion chamber of a uniflow two-cycle engine, including a cylinder 2, a cylinder cover 3, and a piston 10.
A combustion chamber 102 is formed by 1. Cylinder cover 3
A valve box 107 having an exhaust valve 104 and a valve seat 105 is mounted immediately above the center of the piston 101, and a plurality of fuel injection valves 103 are mounted near the outer periphery of the combustion chamber 102 of the cylinder cover. Exhaust gas is discharged to the outside through the cylinder outlet 106 when the exhaust valve is opened. Acoustic sensor 108 on the wall of valve box 107
Is attached to each cylinder one by one, and a position detecting device 109 for determining whether or not the exhaust valve 104 is seated is provided near the upper portion of the exhaust valve 104. Furthermore, the gate circuit 110 that allows the input of the acoustic sensor 110 to pass only while the exhaust valve 104 is seated, the frequency analyzer 111 that analyzes the frequency of the input of the acoustic sensor 110, and the sound pressure of 10 kHz to 40 kHz are calculated to be normal values. An arithmetic unit 112 for determining whether the value is an abnormal value or not, and a display unit 113 are provided.
次に前記実施例の作用について説明する。ピストン101
が下死点から上昇し、排気弁104が閉じると燃焼室102の
圧力は上昇し、上死点付近で燃料噴射弁103から燃料が
噴射されて燃焼が生じると圧力はさらに上昇する。Next, the operation of the above embodiment will be described. Piston 101
Rises from the bottom dead center and the exhaust valve 104 closes, the pressure in the combustion chamber 102 rises, and when the fuel is injected from the fuel injection valve 103 near the top dead center and combustion occurs, the pressure rises further.
次にピストン101が下降すると、シリンダ内圧力は徐々
に低下するが排気弁104が開くまではシリンダ内圧力は
シリンダ出口106の圧力より高い。Next, when the piston 101 descends, the cylinder internal pressure gradually decreases, but the cylinder internal pressure is higher than the pressure at the cylinder outlet 106 until the exhaust valve 104 opens.
排気弁104又は弁座105に傷がなければ、その間に燃焼室
102からシリンダ出口106へのガス漏えいはない。If the exhaust valve 104 or valve seat 105 is not damaged,
There is no gas leakage from 102 to cylinder outlet 106.
しかし排気弁104又は弁座に傷があれば、燃焼室102の圧
力はシリンダ出口106の圧力より高いのでガスの漏えい
が起り、その部分に振動が発生し、それと共に10kHz以
上の高周波の音波を発生する。該音波は音響センサ108
により採取される。However, if the exhaust valve 104 or the valve seat is damaged, the pressure of the combustion chamber 102 is higher than the pressure of the cylinder outlet 106, gas leakage occurs, and vibration occurs at that portion, and at the same time, a high frequency sound wave of 10 kHz or more is generated. Occur. The sound wave is detected by the acoustic sensor 108.
Collected by.
機関は運転中は種々の音響を発生するので、音響センサ
108で採取したデータのうち不要なものはカットする必
要がある。そこでまず排気弁104の着座時のみの音響を
抽出するため、排気弁104の弁棒部分に凸部又は凹部を
設け、その動きを位置検出センサ109で検出して、その
信号をゲート回路110に送る。なお位置検出装置のかわ
りにクランク角度検出装置を使用することも可能であ
る。Since the engine emits various sounds during operation, an acoustic sensor
Of the data collected in 108, unnecessary data need to be cut. Therefore, first, in order to extract the sound only when the exhaust valve 104 is seated, a convex portion or a concave portion is provided on the valve rod portion of the exhaust valve 104, the movement is detected by the position detection sensor 109, and the signal is sent to the gate circuit 110. send. A crank angle detecting device may be used instead of the position detecting device.
次に第２図において、Ａはゲート回路110に入るときの
位置検出装置109の信号、Ｂはゲート回路110に入るとき
の音響センサ108の信号、Ｃはゲート回路110から出てゆ
くときの整形処理をほどこして不要部分を除去した信号
である。Next, in FIG. 2, A is a signal of the position detecting device 109 when entering the gate circuit 110, B is a signal of the acoustic sensor 108 when entering the gate circuit 110, and C is shaping when leaving the gate circuit 110. This is a signal that has undergone processing to remove unnecessary portions.
第２図に示すようにゲート回路110では、音響センサ108
で得られた波形Ｂのうち排気弁開の部分をカットして、
排気弁閉の部分のみを残し波形Ｃを作る。但し排気弁閉
は必ずしも全機関つくる必要はなく一部分の期間のみで
もよい。そしてさらにそのデータを周波数分析器111に
送り分析する。In the gate circuit 110, as shown in FIG.
Cut the exhaust valve open part of the waveform B obtained in
A waveform C is created by leaving only the exhaust valve closed portion. However, it is not always necessary to close the exhaust valve for the whole engine, and the exhaust valve may be closed only for a part of the period. Then, the data is further sent to the frequency analyzer 111 for analysis.
第３図は周波数分析器で分析された結果を示す。実線は
排気弁が正常な場合の例、点線は排気弁が異常な場合の
例である。FIG. 3 shows the result analyzed by the frequency analyzer. The solid line is an example when the exhaust valve is normal, and the dotted line is an example when the exhaust valve is abnormal.
正常な排気弁の場合は8kHzから急激に減少しはじめ、16
kHz付近からグラフ上から消去してしまうのに対して、
異常な場合は8kHz以上になっても余り減少せず、部分的
なピーク値もある。従って10kHz〜40kHzの音圧を演算装
置112で積算し、その値の大小と経時的変化で排気弁104
の漏えい量を把握できる。In the case of a normal exhaust valve, it begins to decrease sharply from 8kHz, 16
While it is deleted from the graph from around kHz,
In an abnormal case, it does not decrease so much even at 8kHz or more, and there is a partial peak value. Therefore, the sound pressure of 10 kHz to 40 kHz is integrated by the arithmetic unit 112, and the exhaust valve 104
You can grasp the amount of leakage.
排気弁の漏えいは、損傷すきまの小さいほど高周波成分
が大きくなるので、排気弁故障ばかりでなく故障の前段
階から診断が可能であり、その結果を表示装置113に表
示することができる。The leakage of the exhaust valve has a higher frequency component as the damage clearance is smaller, so that not only the failure of the exhaust valve but also the diagnosis before the failure can be diagnosed and the result can be displayed on the display device 113.
本発明の排気弁の故障診断方法によれば、判定を演算に
よって行なうため、結果に主観が入らず、判断がスピー
ディに行なうことができる。又排気弁の損傷の小さい場
合でも音のエネルギは小さいが、高周波成分は大きくな
るので、故障の前段階で検知でき、故障を予知できる利
点がある。According to the exhaust valve failure diagnosis method of the present invention, since the determination is performed by calculation, the subjectivity is not included in the result, and the determination can be performed speedily. Further, even if the exhaust valve is less damaged, the sound energy is small, but the high-frequency component is large, so that there is an advantage that it can be detected before the failure and the failure can be predicted.
第１〜３図は本発明に係るもので、第１図は実施例の構
成図、第２図はゲート回路での波形図、第３図は周波数
分析器により解析して得られた線図、第４〜５図は従来
例で、第４図はその構成図、第５図は故障検出原理の説
明図である。 104……排気弁、105……弁座、108……音響センサ、109
……位置検出装置。1 to 3 relate to the present invention, FIG. 1 is a configuration diagram of an embodiment, FIG. 2 is a waveform diagram in a gate circuit, and FIG. 3 is a diagram obtained by analysis by a frequency analyzer. 4 to 5 are conventional examples, FIG. 4 is a configuration diagram thereof, and FIG. 5 is an explanatory diagram of the principle of failure detection. 104 ... Exhaust valve, 105 ... Valve seat, 108 ... Acoustic sensor, 109
...... Position detection device.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 宮崎 貞夫 長崎県長崎市飽の浦町１番１号 三菱重工 業株式会社長崎研究所内 (56)参考文献 特開 昭63−9833（ＪＰ，Ａ) 特開 昭61−66140（ＪＰ，Ａ) 特開 昭54−35515（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Sadao Miyazaki 1-1, Atsunoura-cho, Nagasaki-shi, Nagasaki Mitsubishi Heavy Industries, Ltd. Nagasaki Research Institute (56) Reference JP-A-63-9833 (JP, A) JP 61-66140 (JP, A) JP-A-54-35515 (JP, A)
Claims (1)
05）付近に音響センサ（108）を取り付けると共に排気
弁（104）の着座を検出する位置検出装置（109）を設
け、音響センサ（108）の出力信号中排気弁（104）が着
座時のセンサ出力信号を周波数分析し、分析された周波
数成分のうち10kHz〜40kHzの音圧を積算し、演算装置で
あらかじめ記憶された正常値と比較判定することを特徴
とする排気弁の故障診断方法。1. A valve seat (1) of an exhaust valve (104) of a diesel engine.
05) The acoustic sensor (108) is installed in the vicinity and a position detection device (109) for detecting the seating of the exhaust valve (104) is provided. A method for diagnosing a failure of an exhaust valve, which comprises frequency-analyzing an output signal, summing sound pressures of 10 kHz to 40 kHz among the analyzed frequency components, and making a comparison judgment with a normal value stored in advance in a computing device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62314244A JPH0781932B2 (en) | 1987-12-14 | 1987-12-14 | Exhaust valve failure diagnosis method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62314244A JPH0781932B2 (en) | 1987-12-14 | 1987-12-14 | Exhaust valve failure diagnosis method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01155229A JPH01155229A (en) | 1989-06-19 |
| JPH0781932B2 true JPH0781932B2 (en) | 1995-09-06 |
Family
ID=18051023
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62314244A Expired - Fee Related JPH0781932B2 (en) | 1987-12-14 | 1987-12-14 | Exhaust valve failure diagnosis method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0781932B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9233863B2 (en) | 2011-04-13 | 2016-01-12 | Molycorp Minerals, Llc | Rare earth removal of hydrated and hydroxyl species |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5399687B2 (en) * | 2008-11-14 | 2014-01-29 | 関東化学株式会社 | Air operated valve diagnosis method and air operated valve |
| DE102012021985B4 (en) * | 2012-11-07 | 2024-02-29 | Avl Deutschland Gmbh | Method and device for monitoring an internal combustion engine |
-
1987
- 1987-12-14 JP JP62314244A patent/JPH0781932B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9233863B2 (en) | 2011-04-13 | 2016-01-12 | Molycorp Minerals, Llc | Rare earth removal of hydrated and hydroxyl species |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01155229A (en) | 1989-06-19 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |