JPH081150B2 - Internal combustion engine knocking detection method - Google Patents
Internal combustion engine knocking detection methodInfo
- Publication number
- JPH081150B2 JPH081150B2 JP641687A JP641687A JPH081150B2 JP H081150 B2 JPH081150 B2 JP H081150B2 JP 641687 A JP641687 A JP 641687A JP 641687 A JP641687 A JP 641687A JP H081150 B2 JPH081150 B2 JP H081150B2
- Authority
- JP
- Japan
- Prior art keywords
- knocking
- octane number
- internal combustion
- determination section
- combustion engine
- 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
Landscapes
- Supercharger (AREA)
- Electrical Control Of Ignition Timing (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は内燃機関のノッキング検出方法に関する。The present invention relates to a knocking detection method for an internal combustion engine.
従来、特開昭58−57072号公報のように燃料のオクタ
ン価に応じて点火時期・過給圧・圧縮比等の運転パラメ
ータを切り替えることによって、ノッキングおよびこれ
に伴う機関損傷を回避しつつ良好な機関性能および燃料
消費効率を得る方法が考えられている。Conventionally, by switching operating parameters such as ignition timing, boost pressure, compression ratio, etc. according to the octane number of fuel as in Japanese Patent Laid-Open No. 58-57072, knocking and engine damage associated therewith can be avoided while maintaining good performance. Methods for obtaining engine performance and fuel consumption efficiency have been considered.
〔発明が解決しようとする問題点〕 しかし、前記方法ではたとえば第２図のように、点火
時期を低オクタン価燃料用進角値（ｂ）に切り替える場
合と高オクタン価燃料用進角値（ｃ）に切り替える場合
とではノッキングの発生位置が異なってしまうので、す
べての点火時期でノッキング波形がノッキング判定区間
内（ａ）に入るようにするためには、ノッキング判定区
間を広範囲に設定しなければならない。ところが、第３
図（ａ）に示すようにノッキング判定区間が広すぎる
と、第３図（ｂ）のＡ部のようなノッキング波形の出力
の小さい部分を多く含むために、ノッキング検出信号の
平均値としては異常に小さくなってしまったり、第３図
（ｃ）のＢ部のようなノイズ波形を含む確率が高くなる
ために耐ノイズ性が悪化したりして、ノッキング検出性
を著しく低下させるという問題点があった。また、他の
過給圧・圧縮比等を切り替える場合においても、過給圧
・圧縮比等によってはノッキング判定区間内にノイズ波
形が生じたりして、前記と同様にノッキング検出性を著
しく低下させるという問題があった。[Problems to be Solved by the Invention] However, in the above-mentioned method, for example, as shown in FIG. 2, a case where the ignition timing is switched to the low octane fuel advance value (b) and the high octane fuel advance value (c). Since the knocking occurrence position is different from the case of switching to, the knocking determination section must be set to a wide range in order to make the knocking waveform fall within the knocking determination section (a) at all ignition timings. . However, the third
If the knocking determination section is too wide as shown in FIG. 3A, the average value of the knocking detection signal is abnormal because many knocking waveform output portions such as A in FIG. 3B are included. However, there is a problem that the knocking detectability is remarkably lowered because the noise resistance is deteriorated because the probability of including a noise waveform such as the portion B in FIG. 3 (c) is increased. there were. Also, when switching to other boost pressure / compression ratio, etc., a noise waveform is generated in the knocking determination section depending on the boost pressure / compression ratio, etc., and knocking detectability is remarkably reduced as described above. There was a problem.
そこで本発明は上記の問題を解決することを目的とす
るものである。Then, this invention aims at solving the said problem.
そのため本発明は、燃料のオクタン価に対応して点火
時期・過給圧・圧縮比等の運転パラメータを変更すると
ともに、この運転パラメータの変更に対応してノッキン
グ判定区間を変更することを特徴とする内燃機関のノッ
キング検出方法を提供することを目的とするものであ
る。Therefore, the present invention is characterized in that the operating parameters such as the ignition timing, the boost pressure and the compression ratio are changed in accordance with the octane number of the fuel, and the knocking determination section is changed in accordance with the change in the operating parameters. An object of the present invention is to provide a knocking detection method for an internal combustion engine.
これにより、オクタン価に対応した運転パラメータの
変更に対応してノッキング判定区間とも適切に変更され
る。As a result, the knocking determination section is appropriately changed in response to the change in the operating parameter corresponding to the octane number.
第１図に本発明の一実施例の構成を示すブロック図を
示す。ノッキング検出手段２でノッキングに基づくシリ
ンダ内圧振動を検出し、ノッキング判定手段３で後述す
る６で決定されるノッキング判定区間内において、後述
する７で決定されるノッキング判定レベルとノッキング
検出手段２からの出力信号との比較によって、ノッキン
グの有無を判定し、遅角量決定手段４でノッキング判定
手段３の結果に基づいて遅角量が決定される。オクタン
価判別手段５では前記遅角量に基づいてガソリンのオク
タン価を判別する。たとえば、所定運転領域での遅角量
が所定値以下で制御されている時間が所定期間続いたと
きは高オクタン価燃料が使用されていると判断し、基本
点火時期切替手段９で基本点火時期マップを高オクタン
価用（進角側）に切り替え、さらに、過給圧切替手段８
で制御過給圧を高くする。また、ノッキング判定区間切
替手段６、ノッキング判定レベル切替手段７で高オクタ
ン価・高価給圧用のノッキング判定区間と判定レベルと
に切り替える。逆にオクタン価判別手段５で所定運転領
域での遅角量が所定値以上で制御されている時間が所定
期間続いたときは、低オクタン価燃料が使用されている
と判断し、基本点火時期切替手段９で基本点火時期マッ
プを低オクタン価用（遅角側）に切り替え、さらに過給
圧切替手段８で制御過給圧を低くする。また、各切替手
段6,7で低オクタン価・低過給圧用のノッキング判定区
間と判定レベルとに切り替える。FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. The knocking detection means 2 detects the cylinder internal pressure vibration based on knocking, and the knocking determination means 3 detects the knocking determination level determined in 7 and the knocking determination means 2 in the knocking determination section determined in 6 described later. The presence or absence of knocking is determined by comparison with the output signal, and the retard amount determining unit 4 determines the retard amount based on the result of the knock determining unit 3. The octane number determining means 5 determines the octane number of gasoline based on the retard angle amount. For example, if the time during which the retard amount in the predetermined operation region is controlled to the predetermined value or less continues for the predetermined period, it is determined that the high octane fuel is being used, and the basic ignition timing switching means 9 causes the basic ignition timing map. To a high octane number (advance side), and further, the boost pressure switching means 8
Increase the control boost pressure with. Further, the knocking determination section switching means 6 and the knocking determination level switching means 7 switch between the knocking determination section and the determination level for high octane number / expensive supply pressure. On the contrary, when the octane number discriminating means 5 controls the retard amount in the predetermined operating region at a predetermined value or more for a predetermined period of time, it is determined that the low octane fuel is being used, and the basic ignition timing switching means. In 9, the basic ignition timing map is switched to the low octane number (retard side), and the supercharging pressure switching means 8 lowers the control supercharging pressure. Further, the switching means 6 and 7 switch between the knocking determination section and the determination level for the low octane number / low boost pressure.
ここで、高オクタン価燃料か低オクタン価燃料かの判
別結果に基づいて、ノッキング判定区間と判定レベルを
一対のマップとして切り替えても良いし、ノック判定区
間だけを切り替えも良いし、ノッキング判定区間は特定
運転条件下で切り替えて、ノッキング判定レベルは全域
で切り替えるようにしても良い。また、ノッキング判定
区間・判定レベルともマップ切り替えではなく、運転状
態とオクタン価をパラメータとするオクタン価補正係数
を乗算することによってオクタン価に応じて関数的に修
正しても良い。最後に、遅角量決定手段４と基本点火時
期切替手段９と機関条件判別手段１（エンジン回転数、
負荷、吸気温、水温等）に基づいて点火時期決定手段10
で実行する点火時期が決定される。Here, based on the determination result of the high octane number fuel or the low octane number fuel, the knocking determination section and the determination level may be switched as a pair of maps, only the knocking determination section may be switched, and the knocking determination section is specified. Alternatively, the knocking determination level may be switched over under the driving condition and over the entire range. Further, both the knocking determination section and the determination level may be functionally corrected according to the octane number by multiplying the operating state and the octane number correction coefficient using the octane number as a parameter, instead of switching the map. Finally, the retard angle determining means 4, the basic ignition timing switching means 9, and the engine condition determining means 1 (engine speed,
Ignition timing determination means 10 based on load, intake air temperature, water temperature, etc.
The ignition timing to be executed is determined.
以上のような制御を実行すれば、点火時期が進角側に
変更されてノッキングの発生時期が早くなっても、点火
時期・過給圧・圧縮比等の運転パラメータの変更によっ
てノイズ波形が発生したり、ノッキング判定レベルがず
れたりしても、各々の現象に応じたノッキング判定区間
および判定レベルが選択できるので、あらゆる運転条件
下で高精度なノッキング検出が可能になる。By executing the above control, even if the ignition timing is changed to the advance side and the knocking occurrence timing is earlier, noise waveforms are generated due to changes in the operating parameters such as ignition timing, boost pressure, compression ratio, etc. Even if the knocking determination level shifts or the knocking determination level shifts, the knocking determination section and the determination level corresponding to each phenomenon can be selected, so that highly accurate knocking detection can be performed under all driving conditions.
なお、第１図にブロック図で示したものの全部または
一部をマイクロコンピュータを用いて行うのが好まし
い。その場合の制御手順の一例を第４図に示す。It is preferable that all or part of the block diagram shown in FIG. 1 is performed by using a microcomputer. An example of the control procedure in that case is shown in FIG.
本発明は燃料のオクタン価に対応して点火時期・過給
圧・圧縮比等の運転パラメータを変更するとともに、そ
れに応じて適切なノッキング判定区間を変更することに
よって、あらゆる運転条件で高精度なノッキング検出を
可能にするものである。The present invention changes the operating parameters such as the ignition timing, the boost pressure, the compression ratio, etc. corresponding to the octane number of the fuel, and changes the appropriate knocking determination section accordingly, so that the knocking with high accuracy can be performed under all operating conditions. It enables detection.
第１図は本発明方法を実施する装置の一実施例を示すブ
ロック図、第２図および第３図はオクタン価の相違によ
ってノッキングの判定区間がずれたときおよびノッキン
グ判定区間が広いときに生じる問題点を説明するための
波形図、第４図は本発明方法をマイクロコンピュータで
実施する場合の制御手順の一実施例を示すフローチャー
トである。 ５……オクタン価判別手段,6……ノッキング判定区間切
替手段,7……ノッキング判定レベル切替手段,8……過給
圧切替手段,9……基本点火時期切替手段。FIG. 1 is a block diagram showing an embodiment of an apparatus for carrying out the method of the present invention, and FIGS. 2 and 3 show problems that occur when the knocking determination section is shifted due to the difference in octane number and when the knocking determination section is wide. FIG. 4 is a waveform diagram for explaining the points, and FIG. 4 is a flowchart showing an embodiment of a control procedure when the method of the present invention is carried out by a microcomputer. 5 ... Octane number judging means, 6 ... Knocking judgment section switching means, 7 ... Knocking judgment level switching means, 8 ... Supercharging pressure switching means, 9 ... Basic ignition timing switching means.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｆ０２Ｄ 45/00 ３６４ Ｋ ３６８ Ｄ Ｆ０２Ｐ 5/152 5/153 (56)参考文献 特開 昭58−57072（ＪＰ，Ａ) 特開 昭63−176665（ＪＰ，Ａ) 特開 昭62−157277（ＪＰ，Ａ) 特開 昭60−33026（ＪＰ，Ａ) 特開 昭59−39973（ＪＰ，Ａ) 実開 昭62−195669（ＪＰ，Ｕ) 実開 昭62−171642（ＪＰ，Ｕ) 特公 平６−21576（ＪＰ，Ｂ２)─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification number Office reference number FI technical display location F02D 45/00 364 K 368 D F02P 5/152 5/153 (56) References JP-A-58- 57072 (JP, A) JP 63-176665 (JP, A) JP 62-157277 (JP, A) JP 60-33026 (JP, A) JP 59-39973 (JP, A) Actually open 62-195669 (JP, U) Actually open 62-171642 (JP, U) Japanese Patent Publication 6-21576 (JP, B2)
Claims (4)
給圧・圧縮比等の運転パラメータを変更するとともに、
この運転パラメータの変更に対応してノッキング判定区
間を変更することを特徴とする内燃機関のノッキング検
出方法。Claims: 1. Operating parameters such as ignition timing, boost pressure, compression ratio, etc. are changed according to the octane number of fuel, and
A knocking detection method for an internal combustion engine, characterized in that the knocking determination section is changed in response to the change of the operating parameter.
ン価に対応して点火時期を進角側に変更した場合は判定
開始時期が早くなる方向に、点火時期を遅角側に変更し
た場合は判定開始時期が遅くなる方向に変更されること
を特徴とする特許請求の範囲第１項記載の内燃機関のノ
ッキング検出方法。2. The knocking determination section is determined in the direction in which the determination start timing is advanced when the ignition timing is changed to the advance side in correspondence with the octane number of the fuel, and when the ignition timing is changed to the retard side. The knocking detection method for an internal combustion engine according to claim 1, wherein the start timing is changed in a direction in which the start timing is delayed.
転条件下でのみ実施されることを特徴とする特許請求の
範囲第１項記載の内燃機関のノッキング検出方法。3. The knocking detection method for an internal combustion engine according to claim 1, wherein the knocking determination section is changed only under a specific operating condition.
態とオクタン価をパラメータとするオクタン価補正係数
を乗算することによって関数的に修正されることを特徴
とする特許請求の範囲第１項記載の内燃機関のノッキン
グ検出方法。4. The internal combustion engine according to claim 1, wherein the change of the knocking determination section is functionally corrected by multiplying an operating state and an octane number correction coefficient having an octane number as a parameter. Engine knocking detection method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP641687A JPH081150B2 (en) | 1987-01-13 | 1987-01-13 | Internal combustion engine knocking detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP641687A JPH081150B2 (en) | 1987-01-13 | 1987-01-13 | Internal combustion engine knocking detection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63173829A JPS63173829A (en) | 1988-07-18 |
| JPH081150B2 true JPH081150B2 (en) | 1996-01-10 |
Family
ID=11637764
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP641687A Expired - Fee Related JPH081150B2 (en) | 1987-01-13 | 1987-01-13 | Internal combustion engine knocking detection method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH081150B2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63189672A (en) * | 1987-01-31 | 1988-08-05 | Mazda Motor Corp | Knocking detecting device for engine |
| JPS63289234A (en) * | 1987-05-20 | 1988-11-25 | Mitsubishi Motors Corp | Internal combustion engine with variable compression ratio |
| JPH0736129Y2 (en) * | 1988-07-21 | 1995-08-16 | トヨタ自動車株式会社 | Knotting control device for internal combustion engine |
| JP2006316667A (en) * | 2005-05-11 | 2006-11-24 | Toyota Motor Corp | Knocking determination device for multi-fuel internal combustion engine |
| JP2007092610A (en) * | 2005-09-28 | 2007-04-12 | Toyota Motor Corp | Variable compression ratio internal combustion engine |
| JP2010265885A (en) * | 2008-08-01 | 2010-11-25 | Honda Motor Co Ltd | Compression ratio switching determining device in variable compression ratio internal combustion engine |
| JP2018062888A (en) * | 2016-10-12 | 2018-04-19 | トヨタ自動車株式会社 | Control device for internal combustion engine |
-
1987
- 1987-01-13 JP JP641687A patent/JPH081150B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63173829A (en) | 1988-07-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |