JPS59168334A - Knocking detecting device for internal-combustion engine - Google Patents
Knocking detecting device for internal-combustion engineInfo
- Publication number
- JPS59168334A JPS59168334A JP4361283A JP4361283A JPS59168334A JP S59168334 A JPS59168334 A JP S59168334A JP 4361283 A JP4361283 A JP 4361283A JP 4361283 A JP4361283 A JP 4361283A JP S59168334 A JPS59168334 A JP S59168334A
- Authority
- JP
- Japan
- Prior art keywords
- peak hold
- knocking
- signal
- ignition
- circuit
- 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
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L23/00—Devices 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
- G01L23/22—Devices 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
- G01L23/221—Devices 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
- G01L23/225—Devices 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 circuit arrangements therefor
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electrical Control Of Ignition Timing (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Testing Of Engines (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、内燃機関において機関本体に取（＝ｆ ｉＪ
たノックセン晋すかｌうの信号によりノッキングの発生
状態を検出して点火時期制御を行うノッキング検出装置
に関づるものである。DETAILED DESCRIPTION OF THE INVENTION The present invention provides an internal combustion engine with a
The present invention relates to a knocking detection device that controls ignition timing by detecting the occurrence of knocking based on a signal from a knock sensor.
例えば過給機付内燃機関では、過給時に吸気圧が上昇し
て機関の圧縮圧等が急上昇するため、燃焼室内で点火プ
ラグによる着火後に自然着火することによる異常燃焼で
ノッキングを生じ易くなる。For example, in a supercharged internal combustion engine, the intake pressure increases during supercharging, and the compression pressure of the engine rises rapidly. Therefore, knocking is likely to occur due to abnormal combustion due to spontaneous ignition in the combustion chamber after ignition by a spark plug.
かかるノッキングは直接機関の破損につながるため回避
しなければならず、この対策の１つとして機関本体にそ
の振動を感知するノックセンサを取付（ブ、ノックセン
ナからの信号によりノッキングの発生の有無を判定して
、ノッキング発生時にはその人きさにより点火時期を遅
角させ、（れ以後継続してノッキングが発生するのを防
ぐ装置が必要不可欠なものとして装備されている。Such knocking must be avoided as it directly leads to engine damage, and one of the countermeasures is to install a knock sensor that detects the vibrations in the engine body. Therefore, when knocking occurs, the ignition timing is retarded depending on the nature of the knocking, and a device is indispensable to prevent knocking from occurring again.
このようなノッキング検出装置として、従来例えば特開
昭５４−１０３９１１号公報の先行技術があり、ここで
ノイズ等の影響がないような点火直前での一定クランク
角内の平均値と、点火ｊ褒ノッキングを生じる領域での
振動ピークホールド値との差によりノッキングの発生の
有無を判定することが提案されている。しかるにこの先
行技術による判定法では、一定運転条件下であっても点
火直前の基準となる平均１ｉ（ｆが変動して、誤検出を
まぬがれず、検出回路も複層１であるという問題があっ
た。As such a knocking detection device, there is a prior art, for example, disclosed in Japanese Patent Application Laid-Open No. 54-103911, in which the average value within a constant crank angle immediately before ignition, which is free from the influence of noise, and the ignition reward. It has been proposed to determine whether or not knocking occurs based on the difference between the vibration peak hold value and the vibration peak hold value in the region where knocking occurs. However, with this prior art determination method, there are problems in that even under constant operating conditions, the average 1i(f), which is the reference immediately before ignition, fluctuates, making it impossible to avoid false detection, and the detection circuit is also multi-layered. Ta.
本発明は、このような従来技術に基づくノッキング判定
の問題点に鑑み、各運転条件で発生するノッキング以外
の振動による誤検出を防ぎ、回路構成もディジタル化し
且つマイコン処理して簡素化するようにした内燃機関の
ノッキング検出装置を提供することを目的とする。In view of the problems of knocking determination based on the conventional technology, the present invention prevents false detection due to vibrations other than knocking that occur under various operating conditions, and simplifies the circuit configuration by digitalizing it and processing it with a microcomputer. An object of the present invention is to provide a knocking detection device for an internal combustion engine.
この［ｉ的のため本発明による装置は、ノックセンサか
らの信号のうちの点火時、着座時等のノイズの影響を除
いたピークホールド（ＫＩを点火毎にデ、ｒジタル化し
てＭＰ（Ｊ（ＭＩＣＲＯＰＲＯＣＥＳＳＩＮＧ ＵＮ
ＩＴ＞に取込み、このＭＰＵにおいて過去数回のピーク
ホールド値の平均値と今回のピークホールド値を比較し
てノッキングの発生の有無及びその大きさを判定するこ
とを特徴とするものである。For this purpose, the device according to the present invention digitalizes the peak hold (KI) of the signal from the knock sensor excluding the influence of noise at the time of ignition, seating, etc. (MICROPROCESSING UN
IT>, and this MPU compares the average value of the past several peak hold values with the current peak hold value to determine whether knocking has occurred and its magnitude.
以下、図面を参照して本発明の一実施例を具体的に説明
する。第１図において、先ず本発明が適用される過給機
例エンジンについて説明すると、符号１は過給機であり
、圧縮機１ａの吸入側がダクト２を介してエアクリーナ
３直下流のエアフローメータ４に連通し、その１社出側
が吸気管５、スロワ１ヘル弁６を有するスロットルボデ
ー７、吸気７ニホールド８を介して］−ンジン本体９に
連通する。Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings. In FIG. 1, first, a supercharger example engine to which the present invention is applied will be described. Reference numeral 1 is a supercharger, and the suction side of a compressor 1a is connected to an air flow meter 4 immediately downstream of an air cleaner 3 via a duct 2. The outlet side thereof is connected to an engine body 9 via an intake pipe 5, a throttle body 7 having a thrower valve 6, and an intake nifold 8.
また、エンジン本体９力日らの排気管１０が上記過給機
１のタービン１１）に連通構成され、所定のエンジン回
転数以上にａ５いてυ１気エネルギにより過給機１を駆
！ＩＪ ’ｌることで、過給作用するようになっている
。In addition, the exhaust pipe 10 of the engine body 9 is configured to communicate with the turbine 11 of the supercharger 1, and when the engine speed exceeds a predetermined speed, the supercharger 1 is driven by the energy of υ1. IJ'l is designed to supercharge.
かかる過給１ｍ （＝Ｊエンジンにおいて、本発明によ
るノッキング検出装置は、エンジン本体９に取付（プ１
うれてその振動を感知づるノックセンサ１１からのノッ
キング信号をノック制御回路１２で処理し、ノッキング
発生時にはμ角信号を１イス１−リビュータ１３のイグ
ナイタ１４に出力し、ノッキングの大きさに応じて瞬間
的に遅角ざＵ−るものである。In such a supercharged 1m (=J engine), the knocking detection device according to the present invention is attached to the engine body 9 (
A knock signal from a knock sensor 11 that detects the vibration is processed by a knock control circuit 12, and when knocking occurs, a μ angle signal is output to the igniter 14 of the 1-chair 1-rebuter 13. This causes an instantaneous retardation.
第２図においてノック制御回路１２について詳記すると
、ノックセン勺１１からの信号のうちのノッキングと考
えられる周波数成分だけを取り出すフィルタ１５、増ｒ
ｌ＋器１６、ピークボールド回路、Ａ／Ｄ変換器、及び
Ｍ Ｐ Ｕから成り、該ピークボールド回路はピークホ
ールド用のコンデンサ１７とオペアンプ１８とりけツ１
〜用スイッチ１９がら成り、更にピークホールド回路２
０．Ａ／Ｄ変換器２１を所定のタイミングで動作さけて
各運転条件によりノッキングの判定を行う様にＭＰｔＪ
２２がピークホールド回路２０．該変換器２１に結線さ
れている。To describe the knock control circuit 12 in detail in FIG.
The peak bold circuit consists of a peak hold capacitor 17 and an operational amplifier 18.
It consists of a switch 19 for ~, and a peak hold circuit 2
0. MPtJ operates the A/D converter 21 at a predetermined timing to determine knocking based on each operating condition.
22 is a peak hold circuit 20. It is connected to the converter 21.
次いで、第３図を参照しつつノック制御回路１２の動作
について説明すると、ノックセンサ１１で感知された振
動信号がフィルタ１５で濾過され、増ｒｌ−＋器１Ｇで
増巾されることにより第３図（龜）のようになり、これ
がピークホールド回路２０のコンデンサ１７に充電され
る。ここで、コンデンサ１７はＭＦ−’ＩＪ２２からの
点火信号に同期した第３図θ〕）のリセット信号でスイ
ッチ１９を導通してリセットされ、これにより点火時の
ノイズを除去して各点火毎に第３図（Ｃ）のようなピー
クホールド値が得られる。そして、このピークホールド
値が着座ノイズ等による誤検出を防ぐため各運転条件に
より予めＭ Ｐ Ｕ ２２のＲｏＭに入れておいたプロ
グラムにもとづき第３図（ｄ）のタイミング信８ｆｒＪ
に、Ａ ／ Ｄ変換器２１に指令してそのＡ ／’ Ｄ
変換器２１より所定のピット艮のディジタル信号に変換
してＭｌ）Ｕ２２に取込まれる。Next, the operation of the knock control circuit 12 will be explained with reference to FIG. As shown in the figure, the capacitor 17 of the peak hold circuit 20 is charged. Here, the capacitor 17 is reset by conducting the switch 19 with a reset signal from MF-'IJ22 (FIG. 3 θ) which is synchronized with the ignition signal from the IJ22, thereby eliminating noise at the time of ignition and starting each ignition. A peak hold value as shown in FIG. 3(C) is obtained. Then, in order to prevent erroneous detection due to seating noise, etc., this peak hold value is determined by the timing signal 8frJ shown in FIG.
, instructs the A/D converter 21 to convert the A/'D
The converter 21 converts the signal into a digital signal of a predetermined pit pattern, and the converted signal is input into the Ml)U 22.
こうして、ＭＰＵ２２には第４図のような各点火毎のビ
ークボー＝ルド値が順次取込まれ、△１］が今回の点火
による値とすると、これど過去数回の値の平均値を比較
してノッキング′の判定を行う。即ち、過去５回の平均
値とした場合には、Ｍ＝ （Ａｎ−５−４Ａｎ−４−ｌ
−△ｎ’−−３−ト△１１−２−１△ｎ−＝１＞１５と
なり、この値Ｍと各運転条件により予めＲＯＭに入れて
あいＩＣ判定ｍ ｔｌ’； （ｆｒ Ｘを加算した値Ｍ
十×ど今回のピークホールド値Ａｎが比較され、Ｍｌ、
Ｘ＜△］）の場合にはノッキング発生と判定され、両者
の差Ａｎ−（ＭｌＸ）がその人きざになる。そして、こ
のような遅角信号が出ノ〕してディス１〜リビュ−タ１
３で点火時期の遅角が行われる。In this way, the MPU 22 sequentially receives the peak ball value for each ignition as shown in Fig. 4, and if △1] is the value for the current ignition, then the average value of the past several values is compared. to determine if there is knocking. That is, if the average value of the past five times is used, M= (An-5-4An-4-l
-△n'--3-t△11-2-1△n-=1>15, and according to this value M and each operating condition, it is stored in the ROM in advance and the IC judgment m tl'; value M
The current peak hold value An is compared, Ml,
In the case of X<Δ]), it is determined that knocking has occurred, and the difference An-(MlX) between the two is determined as the occurrence of knocking. Then, such a retarded signal is output and the disc 1 to reviewer 1
3, the ignition timing is retarded.
一方、上記ノッキング発生にＪ：り遅角制御が行われる
と、平均値が大きくなって次回以降のノッキング検出判
定を見逃されないように、次・回の平均値の算出にはΔ
１）の値の代りにＸの値を入れる。On the other hand, when J: retard control is performed when the knocking occurs, the average value becomes large and the next average value is calculated by Δ
Insert the value of X instead of the value of 1).
尚、ノッキング発生後は点火時期の遅角によりノックヒ
ンリ１１の撮動信号におけるピークホールド値は小さく
イｆす、遅角信号は出力しなくなる。Note that after knocking occurs, the peak hold value in the photographing signal of the knock hint 11 becomes small due to the retardation of the ignition timing, and the retard signal is no longer output.
そこで、点火時期はディストリビコータ１３の真空進角
装置による所定の進角量に徐々に戻る。Therefore, the ignition timing gradually returns to a predetermined advance amount by the vacuum advance device of the distributor 13.
以上の説明から明らかなように本発明によると、ノッキ
ング発生の判定を行うノック制御回路１２がディジタル
化した信号をＭＰＵ２２で処理するように構成されてい
るので、回路構成が簡素化づる。As is clear from the above description, according to the present invention, the knock control circuit 12 that determines the occurrence of knocking is configured so that the MPU 22 processes the digitized signal, thereby simplifying the circuit configuration.
ピークホールド回路２０では点火信号に同期したリセッ
ト信号ぐリセッ１〜されて点火時のノイズが除去され、
更にＡ 、−’ Ｄ変換器２１の変換タイミングが着座
ノイズ等を避けるように設定されているので、神々のノ
イズの影響がないピークボールド値を得て、正確なノッ
キングの判定を行うことができる。In the peak hold circuit 20, a reset signal synchronized with the ignition signal is applied to remove noise during ignition.
Furthermore, since the conversion timing of the A, -'D converter 21 is set to avoid seating noise, etc., it is possible to obtain a peak bold value that is free from the influence of divine noise, and to accurately determine knocking. .
第１図は本発明を過給桟付エンジンに適用した場合の実
施例を示す構成図、第２図はノック制御回路を示づ７１
７１７９図、第３図は各部の波形線図、第４図はピーク
ホールド値のディジタル量を示す線図である。
１・・・過給機、１ａ・・・迂縮機、１ｂ・・・タービ
ン、２・・・ダク［へ、３・・・エアクリーナ、４・・
・エアフロルメータ、５・・・吸気管、６・・・スロワ
１ヘル弁、７・・・スロツ］−ルボデ−１８・・・吸気
マニホールド、９・・・エンジン本体、１０・・・Ｄ１
気管１．１１・・・ノックセンザ、１２９．・ノック制
御回路、１３・・・ディストリじユータ、１４・・・イ
グナイタ、１５・・・フィルタ、１６・・・増巾器、２
０・・・ピークホールド回路、２１・・・Ａ ／’／
Ｄ変換器、２２・・・ＭＰＵ。
特Ｖ［出願人 富士重工業株式会社代理人弁理士
小 橋 信 浮Fig. 1 is a block diagram showing an embodiment of the present invention applied to an engine with a supercharged crosspiece, and Fig. 2 shows a knock control circuit.
7179 and FIG. 3 are waveform diagrams of various parts, and FIG. 4 is a diagram showing digital quantities of peak hold values. 1...Supercharger, 1a...Detour compressor, 1b...Turbine, 2...Duck [to, 3...Air cleaner, 4...
・Air flow meter, 5...Intake pipe, 6...Thrower 1 hell valve, 7...Slot]-Rubody-18...Intake manifold, 9...Engine body, 10...D1
Trachea 1.11...Knock Senza, 129. - Knock control circuit, 13... Distributor, 14... Igniter, 15... Filter, 16... Amplifier, 2
0...Peak hold circuit, 21...A /'/
D converter, 22...MPU. Special V [Applicant: Fuji Heavy Industries Co., Ltd. Representative Patent Attorney Nobuyuki Kobashi
Claims (1)
理するノック制御回路が、所定の周波数成分を取出づ−
フィルタ、増巾器、点火信号に同Ｉｌｊしたりセット信
号により点火毎にピークホールド値を得るピークホール
ド回路、点火接所定のタイミングで変換するＡ 、／
Ｄ変換器及び該Ａ／Ｄ変換器から点大毎のピークホール
ド値が取込まれるＭ ＰＵ＠備え、該Ｍ Ｐ Ｕにおい
て過去数回のピークホールド値の平均値と今回のピーク
ホールド値を比較してノッキングの判定を行うことを特
徴とする内燃機関のノッキング検出装置。A knock control circuit that processes signals from a knock sensor attached to the engine body extracts a predetermined frequency component.
A filter, an amplifier, a peak hold circuit that obtains a peak hold value for each ignition by applying the same Ilj to the ignition signal or a set signal, A that converts the ignition contact at a predetermined timing, /
The peak hold value for each point size is taken in from the D converter and the A/D converter, and the current peak hold value is compared with the average of the past several peak hold values in the MPU. A knocking detection device for an internal combustion engine, characterized in that a knocking detection device for an internal combustion engine is configured to determine whether or not knocking occurs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4361283A JPS59168334A (en) | 1983-03-15 | 1983-03-15 | Knocking detecting device for internal-combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4361283A JPS59168334A (en) | 1983-03-15 | 1983-03-15 | Knocking detecting device for internal-combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59168334A true JPS59168334A (en) | 1984-09-22 |
Family
ID=12668656
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4361283A Pending JPS59168334A (en) | 1983-03-15 | 1983-03-15 | Knocking detecting device for internal-combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59168334A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0526613U (en) * | 1991-09-24 | 1993-04-06 | 池田物産株式会社 | Flip-up seat |
| JPH0526608U (en) * | 1991-09-24 | 1993-04-06 | 池田物産株式会社 | Flip-up seat |
-
1983
- 1983-03-15 JP JP4361283A patent/JPS59168334A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0526613U (en) * | 1991-09-24 | 1993-04-06 | 池田物産株式会社 | Flip-up seat |
| JPH0526608U (en) * | 1991-09-24 | 1993-04-06 | 池田物産株式会社 | Flip-up seat |
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