JPS60166739A - Actuation timing controller for internal-combustion engine - Google Patents
Actuation timing controller for internal-combustion engineInfo
- Publication number
- JPS60166739A JPS60166739A JP59023399A JP2339984A JPS60166739A JP S60166739 A JPS60166739 A JP S60166739A JP 59023399 A JP59023399 A JP 59023399A JP 2339984 A JP2339984 A JP 2339984A JP S60166739 A JPS60166739 A JP S60166739A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- cylinder
- pressure
- combustion engine
- fiber cable
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
- F02D41/28—Interface circuits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
- F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
- F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
- F02D35/022—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions using an optical sensor, e.g. in-cylinder light probe
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
- F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
- F02D35/023—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining the cylinder pressure
-
- 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
- F02P5/153—Digital data processing dependent on combustion pressure
-
- 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)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Electrical Control Of Ignition Timing (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は光フアイバケーブルを利用した気筒内圧力セン
サにより内燃機関の点火時期、噴射時期等の作動時期を
制御する装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for controlling operating timings such as ignition timing and injection timing of an internal combustion engine using an in-cylinder pressure sensor using an optical fiber cable.
従来、エンジン気筒内の燃焼による圧力変化を特開昭５
６−１２４６７３号公報に示されるように圧電素子等の
センサを使用して電圧変化として検出し、制御回路へそ
の信号を送る場合、点火回路や外部電波ノイズを受け易
いという問題点がある。また、各気筒別々に測定信号を
やりとりするためには、配線敗退しが多いため、代表の
１気筒の圧力信号だけで全気筒の制御条件を決める方式
が一般に通用されているが、この方式は非測定気筒に対
しては最適条件が得られないという問題がある。Conventionally, pressure changes due to combustion in engine cylinders were measured using Japanese Patent Laid-Open No. 5
As shown in Japanese Patent No. 6-124673, when a sensor such as a piezoelectric element is used to detect a voltage change and send the signal to a control circuit, there is a problem in that it is easily affected by the ignition circuit and external radio noise. In addition, in order to exchange measurement signals for each cylinder separately, there are many wiring failures, so a method is generally used that determines the control conditions for all cylinders using only the pressure signal of one representative cylinder. There is a problem that optimum conditions cannot be obtained for non-measurement cylinders.
そこで、本発明では、気筒内圧を検出するために感圧特
性を備えた光ファイバを有するセンサを用い、この光式
圧力センサを一本の光フアイバケーブルで構成し、各気
筒の圧力変化を光量の変化として検出して内燃機関の点
火時期、噴射時期等の作動時期を制御する構成とするこ
とにより、電磁的ノイズに強く、配線の取廻しが簡略な
作動時期の制御装置を提供することを目的とする。Therefore, in the present invention, a sensor having an optical fiber with pressure-sensitive characteristics is used to detect the cylinder internal pressure, and this optical pressure sensor is configured with a single optical fiber cable, and the pressure change in each cylinder is detected by By detecting changes in the internal combustion engine and controlling operating timing such as ignition timing and injection timing, it is possible to provide an operating timing control device that is resistant to electromagnetic noise and has simple wiring. purpose.
〔実施例〕
図面の符号順に各部の構成要素を説明する。第１図は、
本発明の１実施例を示す全体の構成例である。１は簡略
化して示した４気筒エンジン、２は各気筒を示す。３は
点火プラグ、４ａ〜４ｄば模式的に示した光式圧力セン
サであり、第２図に詳細構成を示す。５は光フアイバケ
ーブル、６は発光ダイオード等の発光素子、７はフォト
トランジスタ等の受光素子を示す。８はディジタル回路
またはマイクロコンピュータ等にて構成され点火時期を
進遅角する点火時期制御手段であり、９は機関に吸入さ
れる空気量を検出する吸入空気量センサ、１０は機関の
回転速度を検出する回転速度センサ、１１は各気筒の基
準位置を検出するクランク角センサを示す。１２はイグ
ナイタ等を含む点火時期可変装置、１３ば点火コイルを
含む点火電圧発生装置、１４は配電器、２４は界雷燃焼
状態等を表示する表示器、２５は所定の気筒位置を検出
する気筒センサである。[Example] The constituent elements of each part will be explained in the order of the reference numerals in the drawings. Figure 1 shows
1 is an example of the overall configuration showing one embodiment of the present invention. 1 is a simplified four-cylinder engine, and 2 is each cylinder. 3 is a spark plug, and 4a to 4d are schematically shown optical pressure sensors, the detailed configuration of which is shown in FIG. 5 is an optical fiber cable, 6 is a light emitting element such as a light emitting diode, and 7 is a light receiving element such as a phototransistor. Reference numeral 8 is an ignition timing control means that advances or retards the ignition timing, which is composed of a digital circuit or a microcomputer, etc., 9 is an intake air amount sensor that detects the amount of air taken into the engine, and 10 is an intake air amount sensor that detects the rotational speed of the engine. A rotational speed sensor 11 detects the reference position of each cylinder, and 11 indicates a crank angle sensor that detects the reference position of each cylinder. 12 is an ignition timing variable device including an igniter, etc.; 13 is an ignition voltage generator including an ignition coil; 14 is a power distributor; 24 is an indicator for displaying field lightning combustion conditions; and 25 is a cylinder for detecting a predetermined cylinder position. It is a sensor.
次に点火時期制御手段８を構成する各制御手段について
述べる。１５は爆発燃焼前後の一定期間のみ（第４図（
ロ））測定用光を発光素子６より出力させる発振手段、
１６は気筒内圧力変化（第４図（イ））によって変化し
た光フアイバケーブル５内の光量変化により気筒内圧力
の変化を第４図（ハ）のように電気信号として検出する
気筒内圧検出手段、１７はこの気筒内圧信号と後述の基
準燃焼状態演算手段１８の最適な気筒内圧の変化状態を
示す信号とを比較して、各気筒が出力、燃費率の面で最
適に燃焼しているか否か及び失火状畑等を判別する燃焼
状態判別手段である。１日は吸入空気量、回転速度、ク
ランク角信号に応じて予めメモリ （ＲＯＭ）に記憶し
である最適な燃焼状態である基準燃焼状態（第４図（ニ
））を決定する基４！燃焼状態演算手段、１９は同じく
吸入空気量、回転速度信号に応じて予めメモリに記憶し
である目標点火時期を決定する目標点火時期演算手段で
ある。２０は気筒センサ２５よりの気筒位置とクランク
角の各信号により、どの気筒の圧力を検知しているかを
指定すると共に発振手段１５に同期信号を与える気筒指
定トリガ手段、２１は燃焼状態判別手段１７で不良燃焼
と判別されなかった気筒内圧検出信号と基準燃焼状態と
の偏差を、ある設定回転数毎に平均して、機関の平均的
燃焼状態を決める平均燃焼状態演算手段、２２は前記目
標点火時期演算手段１９よりの目標点火時期を平均燃焼
状態演算手段２１よりの偏差に応じて補正する点火時期
設定手段、２３は前記燃焼状態判別手段１７よりの失火
や点火状態異常と検出されに気筒を判定し表示器２４で
警報する不良燃焼気筒警報手段を夫々示す。Next, each control means constituting the ignition timing control means 8 will be described. 15 only for a certain period before and after explosive combustion (Fig. 4 (
b)) Oscillation means for outputting measurement light from the light emitting element 6;
Reference numeral 16 denotes cylinder pressure detection means for detecting changes in the cylinder pressure as an electrical signal as shown in FIG. 4(c) based on changes in the amount of light in the optical fiber cable 5 caused by changes in the cylinder pressure (FIG. 4(a)). , 17 compares this cylinder internal pressure signal with a signal indicating an optimal cylinder internal pressure change state from a reference combustion state calculation means 18, which will be described later, to determine whether each cylinder is burning optimally in terms of output and fuel efficiency. This is a combustion state discriminating means for discriminating whether there is a fire or a misfire in the field. On the 1st, a reference combustion state (Fig. 4 (d)), which is the optimum combustion state, is determined in advance by storing it in a memory (ROM) according to the intake air amount, rotational speed, and crank angle signal. The combustion state calculation means 19 is a target ignition timing calculation means which determines a target ignition timing which is stored in the memory in advance in accordance with the intake air amount and rotational speed signals. Reference numeral 20 indicates a cylinder specifying trigger means for specifying which cylinder's pressure is being detected based on each signal of the cylinder position and crank angle from the cylinder sensor 25, and also provides a synchronization signal to the oscillation means 15. Reference numeral 21 indicates a combustion state determining means 17. average combustion state calculation means which determines the average combustion state of the engine by averaging the deviation between the cylinder internal pressure detection signal that is not determined to be bad combustion and the reference combustion state for each set rotation speed; 22 is the target ignition; Ignition timing setting means 23 corrects the target ignition timing from the timing calculation means 19 according to the deviation from the average combustion state calculation means 21; A defective combustion cylinder alarm means for making a judgment and issuing an alarm on the display 24 is shown.
第２図ｔａ＋、 （ｂ）は直列に接続された光式圧力セ
ンサ４ａ〜４ｄの一つの気筒の平面断面図及び側面図で
あり、４０１は光フアイバケーブル５内の光ファイバ４
０２，４０２’を貫通して保持するドーナツ状のケース
であり、特に４０２′は例えば内部中空状で感圧特性を
有する。４０３ば光ファイバ４０２をケース４０１に接
着固定する接着剤、４０４はケース内に一部露出した光
ファイバ４０２′と光ファイバ４０２とを接続する融着
部である。2(b) is a plan sectional view and a side view of one cylinder of the optical pressure sensors 4a to 4d connected in series, and 401 is an optical fiber 4 in the optical fiber cable 5.
02, 402' is a donut-shaped case that penetrates and holds the case, and in particular, 402' is hollow inside and has pressure-sensitive characteristics. 403 is an adhesive for adhesively fixing the optical fiber 402 to the case 401, and 404 is a fusion part that connects the optical fiber 402' partially exposed inside the case and the optical fiber 402.
第３図は、この光式圧力センサを点火プラグ３とシリン
ダへソド１００との間に座金部３０を介して締めつけた
構成例は示す。この構成において気筒的爆発圧力は、ネ
ジ部に設けた隙間３１を通して、光式圧力センサの感圧
部である光ファイ）＜４０２′に印加され、前述の様な
圧力変化信号を光の変化信号として出力することができ
る。FIG. 3 shows an example of a configuration in which this optical pressure sensor is fastened between the spark plug 3 and the cylinder head 100 with a washer 30 interposed therebetween. In this configuration, the cylinder-like explosion pressure is applied to the optical fiber (402') which is the pressure sensing part of the optical pressure sensor through the gap 31 provided in the threaded part, and the pressure change signal as described above is transmitted as an optical change signal. It can be output as
第４図は、本発明の構成による各部信号波形の例を示す
。（イ）はａ、ｂ、ｃ、ｄで示した各気筒の圧力変化を
時間横軸にして示した図、（ロ）は測定用の光を発光素
子６より発振する時間タイミングを示す図、（ハ）は前
記受光素子７よりの信号を受けて、前記気筒内圧検出手
段１６で検出された各気筒の圧力信号 １．ｂｌ、Ｃ１
，ａ＋を示した図、（ニ）は前記基準燃焼状態を示す各
気筒の圧力波形図である。FIG. 4 shows examples of signal waveforms of various parts according to the configuration of the present invention. (A) is a diagram showing the pressure changes in each cylinder indicated by a, b, c, and d on the horizontal axis of time, (B) is a diagram showing the time timing of oscillating measurement light from the light emitting element 6, (C) is the pressure signal of each cylinder detected by the cylinder internal pressure detection means 16 in response to the signal from the light receiving element 7.1. bl, C1
, a+, and (d) is a pressure waveform diagram of each cylinder showing the reference combustion state.
第５図は、上記実施例の光式圧力センサと異なり多芯の
光フアイバケーブル（本例では６芯）で各気筒内圧を計
測するセンサシステムの例で、ｄ〜ｉの符号は各気筒に
対応する光ファイバを示す。Fig. 5 shows an example of a sensor system that measures the internal pressure of each cylinder using a multi-core optical fiber cable (6 cores in this example), unlike the optical pressure sensor of the above embodiment. The corresponding optical fiber is shown.
ｆａ１図は光ファイバが直列に配設され、特定の光フア
イバ以外はその気筒をバイパスする構成を模式的に示し
た例で、５は光フアイバケーブル、６゜７は発光、受光
素子を示す。またｔｂ１図は光ファイハゲープルの断面
図を示すものである。Fig. fa1 is an example schematically showing a configuration in which optical fibers are arranged in series, and the cylinders are bypassed except for a specific optical fiber. 5 is an optical fiber cable, and 6° and 7 are light emitting and light receiving elements. In addition, Figure tb1 shows a cross-sectional view of the optical fiber gear pull.
また、発光、受光素子の他の例として第６図のごとく発
光素子６または受光素子７をｆａ１図のように回路素子
上でＲａ −Ｒｃの如く分割し別々の波長の光をｉｂ１
図のように発光または受光できる様に波に分離フィルタ
２，３を設ける構成とし、各気筒毎に異なる波長の光で
圧力を計測することによっζ、一本の光ファイバを用い
気筒数が多くても粘度の良い圧力検出信号を得ることが
できる。As another example of a light emitting and light receiving element, the light emitting element 6 or the light receiving element 7 as shown in FIG.
As shown in the figure, the configuration is such that separation filters 2 and 3 are provided on the waves so that they can emit or receive light, and by measuring the pressure with light of a different wavelength for each cylinder, the number of cylinders can be determined using one optical fiber. At most, a pressure detection signal with good viscosity can be obtained.
また、ガソリンエンジンの点火時期制御だけでなく、デ
ィーゼルエンジンの噴射時期の制御にも目打シに本発明
を適用できる。Further, the present invention can be applied not only to the ignition timing control of a gasoline engine but also to the injection timing control of a diesel engine.
以上述べたように本発明は、怒圧特性を備えた光ソアイ
ハを各気筒毎に配して一本の光フアイバケーブルの形で
光式圧力センサを構成し、各気筒の圧力変化を光量の変
化として検出し点火時期、噴射時期等の作動時期を制御
するようにしているので、電磁的ノイズに影響されるこ
となく、しかも配線の取廻しを簡略化して気筒内圧を検
出でき、内燃機関の作動時期を正確に制御できるという
優れた効果がある。As described above, the present invention configures an optical pressure sensor in the form of a single optical fiber cable by arranging an optical sensor with angry pressure characteristics for each cylinder, and detects pressure changes in each cylinder by changing the amount of light. As the change is detected and the operating timing such as ignition timing and injection timing is controlled, the cylinder pressure can be detected without being affected by electromagnetic noise, and the wiring can be simplified, making it possible to detect internal combustion engine pressure. This has the excellent effect of being able to accurately control the activation timing.
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図中の光式圧力センサの平面断面図及び側面図、第
３図は第２図の光式圧力センサの取イ１状態を示す図、
第４図は本発明の作動説明に供する波形図、第５図は光
式圧力センサの他の例を示す構成図、第６図は発光また
は受光素子を分割した例を示す構成図並びに特性図であ
る。
■・・・エンジン、２・・・気筒、３・・・点火プラグ
、４ｄ〜４ｄ・・・光式圧力センサ、５・・・光フアイ
バケーブル、６・・・発光素子、７・・・受光素子、８
・・・点火時期制御手段、３■・・・隙間、４０１・・
・ケース、４０２．４０２’・・・光ファイバ。
代理人弁理士 岡 部 隆
第１図
第２図
Ｃυ （ｂ）
第４図FIG. 1 is an overall configuration diagram showing an embodiment of the present invention, FIG. 2 is a plan sectional view and side view of the optical pressure sensor shown in FIG. 1, and FIG. 3 is a diagram of the optical pressure sensor shown in FIG. 2. A diagram showing the Tori A1 state,
Fig. 4 is a waveform diagram for explaining the operation of the present invention, Fig. 5 is a configuration diagram showing another example of the optical pressure sensor, and Fig. 6 is a configuration diagram and characteristic diagram showing an example in which the light emitting or light receiving element is divided. It is. ■... Engine, 2... Cylinder, 3... Spark plug, 4d~4d... Optical pressure sensor, 5... Optical fiber cable, 6... Light emitting element, 7... Light receiving Motoko, 8
...Ignition timing control means, 3■...Gap, 401...
・Case, 402.402'...Optical fiber. Representative Patent Attorney Takashi Okabe Figure 1 Figure 2 Cυ (b) Figure 4
Claims (1)
た感圧特性を持つ光ファイバを含む一本の光フアイバケ
ーブル、この光フアイバケーブルの一端より光を入射さ
せる発光素子、他端よりこの光フアイバケーブル内を伝
搬した光を受ける受光素子を有する光式圧力センナと、
内燃機関の運転状態を検出する運転状Ｓ検出手段と、前
記光式圧力センサにより検出された気筒内圧信号により
前記運転状態検出信号に応じて演算される内燃機関の作
動時期を補正し、この補正された信号により前記作動時
期を制御する作動時期制御手段とを備えたことを特徴と
する内燃機関用作動時期制御装置。 （２）前記作動時期は点火時期であることを特徴とする
特許請求の範囲第１項記載の内燃機関用作動時期制御装
置。 （３）前記作動時期は噴射時期であることを特徴とする
特許請求の範囲第１項記載の内燃機関用作動時期制御装
置。 （４）前記光ファイバは直列に接続されて一本の光フア
イバケーブルを構成することを特徴とする特許請求の範
囲第１項乃至第３項のいずれかに記載の内燃機関用作動
時期制御装置。 （５）前記光ファイバは各気筒毎に並列に配設されて一
本の光フアイバケーブルを構成することを特徴とする特
許請求の範囲第１項乃至第３項のいずれかに記載の内燃
機関用作動時期制御装置。[Claims] (11) An optical fiber cable including an optical fiber having a pressure-sensitive characteristic, which is disposed in a portion receiving the internal pressure of each cylinder of an internal combustion engine, and light is incident from one end of the optical fiber cable. an optical pressure sensor having a light emitting element and a light receiving element that receives light propagated within the optical fiber cable from the other end;
correcting the operating timing of the internal combustion engine calculated according to the operating state detection signal using the operating state S detection means for detecting the operating state of the internal combustion engine and the cylinder internal pressure signal detected by the optical pressure sensor; an operation timing control device for an internal combustion engine, comprising an operation timing control means for controlling the operation timing based on a signal generated by the engine. (2) The operating timing control device for an internal combustion engine according to claim 1, wherein the operating timing is an ignition timing. (3) The operating timing control device for an internal combustion engine according to claim 1, wherein the operating timing is an injection timing. (4) The operating timing control device for an internal combustion engine according to any one of claims 1 to 3, wherein the optical fibers are connected in series to constitute one optical fiber cable. . (5) The internal combustion engine according to any one of claims 1 to 3, wherein the optical fibers are arranged in parallel for each cylinder to constitute one optical fiber cable. Operation timing control device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59023399A JPS60166739A (en) | 1984-02-09 | 1984-02-09 | Actuation timing controller for internal-combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59023399A JPS60166739A (en) | 1984-02-09 | 1984-02-09 | Actuation timing controller for internal-combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60166739A true JPS60166739A (en) | 1985-08-30 |
Family
ID=12109429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59023399A Pending JPS60166739A (en) | 1984-02-09 | 1984-02-09 | Actuation timing controller for internal-combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60166739A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19539919A1 (en) * | 1994-10-26 | 1996-05-02 | Hitachi Ltd | Cylinder inner pressure sensing system for controlling multi-cylinder engine |
| US5693936A (en) * | 1993-04-27 | 1997-12-02 | Hitachi, Ltd. | Physical quantity detecting apparatus and internal combustion engine control apparatus each utilizing optical fiber |
| US5745611A (en) * | 1995-10-06 | 1998-04-28 | Hitachi, Ltd. | Optical fiber pressure sensor |
| US5831263A (en) * | 1994-04-26 | 1998-11-03 | Hitachi, Ltd. | In-cylinder pressure sensing apparatus for multi-cylinder engine |
| US6301957B1 (en) | 1997-12-15 | 2001-10-16 | Hitachi, Ltd. | Fiber-optic cylinder pressure sensor |
| EP1662244A2 (en) | 2004-11-29 | 2006-05-31 | HONDA MOTOR CO., Ltd. | A misfire detection apparatus |
| US9279406B2 (en) | 2012-06-22 | 2016-03-08 | Illinois Tool Works, Inc. | System and method for analyzing carbon build up in an engine |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3782192A (en) * | 1971-02-25 | 1974-01-01 | Asea Ab | Means for determining a magnitude corresponding to the thickness profile of a paper web |
-
1984
- 1984-02-09 JP JP59023399A patent/JPS60166739A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3782192A (en) * | 1971-02-25 | 1974-01-01 | Asea Ab | Means for determining a magnitude corresponding to the thickness profile of a paper web |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5693936A (en) * | 1993-04-27 | 1997-12-02 | Hitachi, Ltd. | Physical quantity detecting apparatus and internal combustion engine control apparatus each utilizing optical fiber |
| US5831263A (en) * | 1994-04-26 | 1998-11-03 | Hitachi, Ltd. | In-cylinder pressure sensing apparatus for multi-cylinder engine |
| DE19539919A1 (en) * | 1994-10-26 | 1996-05-02 | Hitachi Ltd | Cylinder inner pressure sensing system for controlling multi-cylinder engine |
| DE19539919C2 (en) * | 1994-10-26 | 1998-08-13 | Hitachi Ltd | In-cylinder pressure sensing device for multi-cylinder engines |
| US5745611A (en) * | 1995-10-06 | 1998-04-28 | Hitachi, Ltd. | Optical fiber pressure sensor |
| US6301957B1 (en) | 1997-12-15 | 2001-10-16 | Hitachi, Ltd. | Fiber-optic cylinder pressure sensor |
| EP1662244A2 (en) | 2004-11-29 | 2006-05-31 | HONDA MOTOR CO., Ltd. | A misfire detection apparatus |
| US7257482B2 (en) | 2004-11-29 | 2007-08-14 | Honda Motor Co., Ltd. | Misfire detection apparatus |
| US9279406B2 (en) | 2012-06-22 | 2016-03-08 | Illinois Tool Works, Inc. | System and method for analyzing carbon build up in an engine |
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