JPS63208671A - Ignitor for internal combustion engine - Google Patents

Ignitor for internal combustion engine

Info

Publication number
JPS63208671A
JPS63208671A JP3923087A JP3923087A JPS63208671A JP S63208671 A JPS63208671 A JP S63208671A JP 3923087 A JP3923087 A JP 3923087A JP 3923087 A JP3923087 A JP 3923087A JP S63208671 A JPS63208671 A JP S63208671A
Authority
JP
Japan
Prior art keywords
cylinder
ignition
crank angle
angle sensor
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.)
Pending
Application number
JP3923087A
Other languages
Japanese (ja)
Inventor
Hideo Takahashi
秀夫 高橋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Unisia Automotive Ltd
Original Assignee
Japan Electronic Control Systems Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Japan Electronic Control Systems Co Ltd filed Critical Japan Electronic Control Systems Co Ltd
Priority to JP3923087A priority Critical patent/JPS63208671A/en
Publication of JPS63208671A publication Critical patent/JPS63208671A/en
Pending legal-status Critical Current

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  • Ignition Installations For Internal Combustion Engines (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

PURPOSE:To improve reliability in case of defect by using the inexpensive device by detecting the compression top dead center position of each cylinder on the basis of the signal of a cylinder internal pressure detecting means installed in each cylinder and carrying out the judgement of the cylinder to be ignited and carrying out ignition control, when a crank angle sensor fails. CONSTITUTION:During the engine operation, a crank angle sensor 5 performs self diagnosis, in a control unit 10, and if the judgement is 'normal', ignition control is executed on the basis of the signal of the crank angle sensor 5. In case of anomaly, ignition control by the cylinder internal pressure sensors 6(6-1-6-n) is executed. While, in case of anomaly, ignition control is suspended during two times of revolution of the engine, and the output voltage of each cylinder internal pressure sensor 6, i.e., peak value at the compression top dead center of each cylinder is read and memorized. Then, the slice level is calculated in order to judge the compression cycle on the basis of the memorized peak value, and then the slice level and the output of the cylinder internal pressure sensor 6 are compared, and an ignition signal is outputted.

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点火装置に関し、特に気筒毎に点火
コイルを備えて独立に点火制御を行う点火装置における
クランク角センサ故障時のフェイル・セーフ技術に関す
る。
DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an ignition system for an internal combustion engine, and in particular to a failure/failure caused by a crank angle sensor failure in an ignition system that is equipped with an ignition coil for each cylinder and performs ignition control independently. Regarding safe technology.

〈従来の技術〉 内燃機関の点火装置として、気筒毎に点火コイルを設は
点火順序に従って独立に点火制御を行うようにしたもの
がある(例えば実願昭61−23894号等)。
<Prior Art> There is an ignition system for an internal combustion engine in which an ignition coil is provided for each cylinder and ignition control is performed independently according to the ignition order (for example, Utility Model Application No. 61-23894).

かかる点火装置について第5図に基づき簡単に説明する
。図において、気筒(#1〜#n)毎に点火コイル1−
1〜l−nが設けられ、その各X次側は、対応するパワ
ートランジスタ2−1’−2−nを介して接地され、各
2次側は気筒毎の点火プラグ3−1〜3−nが接続され
ている。各パワートランジスタ2−1〜2−nのベース
にはコントロールユニット4からそれぞれ独立して点火
信号が入力される。5はクランク角センサである。
Such an ignition device will be briefly explained based on FIG. In the figure, each cylinder (#1 to #n) has an ignition coil 1-
1 to 1-l-n are provided, and each secondary side thereof is grounded via a corresponding power transistor 2-1'-2-n, and each secondary side is connected to a spark plug 3-1 to 3-n for each cylinder. n is connected. Ignition signals are input independently from the control unit 4 to the bases of the power transistors 2-1 to 2-n. 5 is a crank angle sensor.

かかる点火装置の動作は、検出された機関運転条件に応
じてコントロールユニット4内のマイクロコンピュータ
で演算された所定のパルス巾の点火信号を、点火順序に
従ってそれぞれのパワートランジスタ2−1〜2−nへ
順次出力することにより、対応する点火コイル1−1〜
1−nの2次側に高電圧を発生させてその点火プラグ3
−1〜3−nを放電させて点火する。そして、点火すべ
き気筒の判別はクランク角センサ5からのリファレンス
信号に基づいて行っている。
The operation of the ignition system is such that an ignition signal of a predetermined pulse width calculated by a microcomputer in the control unit 4 is sent to each of the power transistors 2-1 to 2-n in accordance with the ignition order according to detected engine operating conditions. By sequentially outputting to the corresponding ignition coils 1-1 to
A high voltage is generated on the secondary side of 1-n and the spark plug 3
-1 to 3-n are discharged and ignited. The cylinder to be ignited is determined based on a reference signal from the crank angle sensor 5.

また、このように気筒毎に独立して点火制御を行う点火
装置においては、第6図に示すように気筒毎に筒内圧セ
ンサ6−1〜6−nを設け、その検出信号を各ダイオー
ドD、〜D1を介して並列に1つの演算項11器7に入
力し、A/Dコンバータ8を介してマイクロコンピュー
タへ入力している。そして、これら筒内圧センサ6−1
〜6−nによって各気筒のノッキングの有無を検出し点
火時期を補正するようにしている。尚、各筒内圧センサ
6−1〜6−nはクランク角センサ5からの信号を利用
することによって区別することができる。
In addition, in an ignition system that performs ignition control independently for each cylinder, cylinder pressure sensors 6-1 to 6-n are provided for each cylinder, as shown in FIG. , ~D1 in parallel to one operational term 11 unit 7, and via the A/D converter 8 to the microcomputer. These cylinder pressure sensors 6-1
-6-n, the presence or absence of knocking in each cylinder is detected and the ignition timing is corrected. Note that each cylinder pressure sensor 6-1 to 6-n can be distinguished by using a signal from the crank angle sensor 5.

〈発明が解決しようとする問題点〉 ところが、このような点火方式の場合、クランク角セン
サ5に故障が発生すると気筒判別が行えなくなり、どの
気筒が圧縮上死点に向かっているかが判らなくなり、点
火制御が不能になる。そこで、クランク角センサ5故障
時のフェイル・セーフ機能を備える必要があり、これに
は、予備のクランク角センサを設けることが考えられて
いるが大巾なコスト増になるという問題がある。
<Problems to be Solved by the Invention> However, in the case of such an ignition system, if a failure occurs in the crank angle sensor 5, cylinder discrimination cannot be performed, and it becomes impossible to determine which cylinder is heading toward compression top dead center. Ignition control becomes impossible. Therefore, it is necessary to provide a fail-safe function in the event of a failure of the crank angle sensor 5. Although it has been considered to provide a spare crank angle sensor for this purpose, there is a problem in that it would significantly increase costs.

本発明は上記の実情に鑑みてなされたもので、クランク
角センサ故障時に筒内圧センサの信号を利用して気筒判
別を行うことにより、コスト増を招くことなくフェイル
・セーフ機能を備えた内燃機関の点火装置を提供するこ
とを目的とする。
The present invention has been made in view of the above-mentioned circumstances, and is an internal combustion engine equipped with a fail-safe function without increasing costs by identifying cylinders using a signal from a cylinder pressure sensor when a crank angle sensor fails. The purpose is to provide an ignition device for

〈問題点を解決するための手段〉 このため本発明は気筒ごとに独立して点火信号が出力さ
れる構成の点火装置において、第1図に示すように、気
筒毎に設けた部内圧検出手段と、クランク角センサの故
障を検出する故障検出手段と、クランク角センサ故障時
にクランク角センサ信号に基づいて点火制御を行ってい
る制御手段の制御を停止する停止手段と、制御手段の制
御停止後に前記各部内圧検出手段からそれぞれ独立して
入力する部内圧検出信号に基づいて各点火コイルへの点
火信号を出力する補助制御手段とを設けて構成した。
<Means for Solving the Problems> For this reason, the present invention provides an ignition system configured to output an ignition signal independently for each cylinder, as shown in FIG. a failure detection means for detecting a failure of the crank angle sensor; a stopping means for stopping the control of the control means that performs ignition control based on the crank angle sensor signal when the crank angle sensor fails; and after stopping the control of the control means. An auxiliary control means is provided for outputting an ignition signal to each ignition coil based on a section internal pressure detection signal inputted independently from each section internal pressure detection means.

〈作用〉 上記の構成によれば、クランク角センサ故障時に、各部
内圧検出手段からの信号に基づいて各気筒の圧縮上死点
位置を検出することで点火すべき気筒の判別を行い点火
制御ができるようになるので、予備のクランク角センサ
を設ける必要がなくコスト増を防ぐことができるように
なる。
<Operation> According to the above configuration, when the crank angle sensor fails, the cylinder to be ignited is determined by detecting the compression top dead center position of each cylinder based on the signals from the internal pressure detection means of each part, and the ignition control is performed. Therefore, there is no need to provide a spare crank angle sensor, and an increase in costs can be prevented.

〈実施例〉 以下本発明の一実施例を説明する。尚、従来と同一部分
には同一符号を付して説明を省略する。
<Example> An example of the present invention will be described below. Incidentally, the same parts as in the prior art are given the same reference numerals, and the description thereof will be omitted.

本発明の一実施例のハードウェア構成を示す第2図にお
いて、コントロールユニッ目0内のマイクロコンピュー
タ11には、従来と同様にしてクランク角センサ5のリ
ファレンス(REF)信号とポジション(PO3)信号
及び各気筒(#1〜#n)に設けた部内圧検出手段とし
ての筒内圧センサ6−1〜6−nの信号が入力している
。ここで、各筒内圧センサ6−1〜6−nの信号は、そ
れぞれの演算増巾器7−1〜7−n及びA/Dコンバー
タ8−1〜8−nを介して独立にマイクロコンピュータ
11に入力している。尚、マイクロコンピュータ11か
ら各パワートランジスタ2−1〜2−nへ独立して点火
信号が出力され、それぞれの点火コイル1−1〜1−n
及び各点火プラグ3−1〜3−nを動作させることは従
来と同様である。
In FIG. 2 showing the hardware configuration of an embodiment of the present invention, a microcomputer 11 in control unit 0 receives a reference (REF) signal and a position (PO3) signal of a crank angle sensor 5 in the same manner as in the past. Also, signals from cylinder pressure sensors 6-1 to 6-n as internal pressure detection means provided in each cylinder (#1 to #n) are input. Here, the signals of each cylinder pressure sensor 6-1 to 6-n are independently transmitted to the microcomputer via the respective operational amplifiers 7-1 to 7-n and A/D converters 8-1 to 8-n. 11 is entered. Incidentally, an ignition signal is independently output from the microcomputer 11 to each power transistor 2-1 to 2-n, and each ignition coil 1-1 to 1-n
The operation of each spark plug 3-1 to 3-n is the same as in the conventional case.

次に第3図及び第4図のフロニチャートを参照しながら
作用を説明する。
Next, the operation will be explained with reference to the phronicharts of FIGS. 3 and 4.

まず、第3図において、ステップ(図中Sで示し、以下
同じとする)lでは、クランク角センサ5の自己診断を
行い、正常(OK)であれば、ステップ2に進み、異常
(NG)であればステップ3に進む。この機能がクラン
ク角センサの故障検出手段及び停止手段に相当する。
First, in FIG. 3, in step 1 (indicated by S in the figure, the same applies hereinafter), the crank angle sensor 5 is self-diagnosed, and if it is normal (OK), the process proceeds to step 2 and an abnormality (NG) is performed. If so, proceed to step 3. This function corresponds to a failure detection means and a stop means for the crank angle sensor.

ステップ2では、従来と同様のクランク角センサ5の信
号に基づく点火制御が行われ、ステップペ3では、クラ
ンク角センサ5故障時のフェイル・セーフ機能である筒
内圧センサ6−1〜6−nによる点火制御が行われる。
In step 2, ignition control is performed based on the signal from the crank angle sensor 5 as in the past, and in step 3, the cylinder pressure sensors 6-1 to 6-n are used as a fail-safe function in the event of a failure of the crank angle sensor 5. Ignition control is performed.

前記ステップ2と3の各機能が制御手段と補助制御手段
に相当する。
The functions of steps 2 and 3 correspond to a control means and an auxiliary control means.

次に第4図のフローチャートにより、筒内圧センサに基
づく点火制御の具体的な例を説明する。
Next, a specific example of ignition control based on the cylinder pressure sensor will be explained with reference to the flowchart of FIG.

まず、ステップ11では、第3図において、筒内圧セン
サに基づく点火制御に移行されると、機関の2回転だけ
点火制御を休止し、この間に各気筒の圧縮上死点におけ
る各筒内圧センサ6−1〜6−〇の出力電圧、即ちピー
ク値Vpを読込んでこれを記憶する。
First, in step 11, when the ignition control is shifted to based on the cylinder pressure sensor in FIG. The output voltage from -1 to 6-0, that is, the peak value Vp is read and stored.

ステップ12では、前記記憶した各ピーク値Vpに基づ
いて圧縮行程にあることを判断するためのスライスレベ
ルVrefを算出する。
In step 12, a slice level Vref for determining whether the compression process is in progress is calculated based on each of the stored peak values Vp.

このスライスレベルVrefは例えばピーク(iVpの
1/2又は2/3等に設定すればよい。
This slice level Vref may be set to, for example, the peak (1/2 or 2/3 of iVp, etc.).

前記スライスレベルVrefの設定が終了したら、ステ
ップ13で、各筒内圧センサ6−1〜6−nの出力電圧
Vinを読込む。
When the setting of the slice level Vref is completed, in step 13, the output voltage Vin of each cylinder pressure sensor 6-1 to 6-n is read.

ステップ14で、読込んだ出力電圧Vinと算出したス
ライスレベルVrefとを比較し、Vln≧Vrefに
なった気筒が圧縮行程にあると判断し、ステップ15で
その気筒への点火信号を出力する。
In step 14, the read output voltage Vin is compared with the calculated slice level Vref, and it is determined that the cylinder for which Vln≧Vref is in the compression stroke, and in step 15, an ignition signal is output to that cylinder.

このようにすれば、予備のクランク角センサを設けるこ
となくクランク角センサ故障時にも確実に点火すべき気
筒に対して点火信号を出力でき、フェイル・セーフ処理
が可能となる。
In this way, even if the crank angle sensor fails, the ignition signal can be reliably output to the cylinder that should be ignited without providing a spare crank angle sensor, and fail-safe processing becomes possible.

そして、既存の筒内圧センサを利用するので、コスト増
になることはない。
Since the existing cylinder pressure sensor is used, there is no increase in cost.

尚、本実施例では、筒内圧センサ毎に演算増巾器及びA
/Dコンバータを設けるようにしたが、筒内圧セサンの
出力を順次走査する走査回路を設け、演算増巾器及びA
/Dコンバータを各1つとするように構成してもよい。
In addition, in this embodiment, a calculation amplifier and an A
A/D converter was installed, but a scanning circuit was also installed to sequentially scan the output of the in-cylinder pressure sensor, and an operational amplifier and an A/D converter were installed.
The configuration may be such that there is only one /D converter.

〈発明の効果〉 以上述べたように本発明によれば、クランク角センサ故
障時には、筒内圧センサの信号を利用して点火制御する
ようにしたので、クランク角センサ故障時のフェイル・
セーフ機能を付加するに際し、高価な予備のクランク角
センサを装備する必要がなく低コストにできる。
<Effects of the Invention> As described above, according to the present invention, when the crank angle sensor fails, the ignition is controlled using the signal from the cylinder pressure sensor.
When adding a safety function, there is no need to equip an expensive spare crank angle sensor, which can reduce costs.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の詳細な説明するブロック図、第2図は
本発明の一実施例のハードウェア構成を示す図、第3図
は同上実施例の点火制御切換えを示すフローチャート、
第4図は同上実施例の筒内圧センサに基づく点火制御の
フローチャート、第5図は従来例のハードウェア構成を
示す図、第6図は同上従来例の筒内圧センサによる部内
圧検出回路部分を示す図である。
FIG. 1 is a block diagram explaining the present invention in detail, FIG. 2 is a diagram showing the hardware configuration of one embodiment of the present invention, and FIG. 3 is a flowchart showing ignition control switching of the same embodiment.
Fig. 4 is a flowchart of ignition control based on the cylinder pressure sensor of the above embodiment, Fig. 5 is a diagram showing the hardware configuration of the conventional example, and Fig. 6 shows the internal pressure detection circuit portion using the cylinder pressure sensor of the above conventional example. FIG.

Claims (1)

【特許請求の範囲】[Claims] 気筒毎に設けられる各点火コイルの点火信号を、クラン
ク角センサからのクランク角信号に基づいて順次独立し
て出力する制御手段を有する内燃機関の点火装置におい
て、気筒毎に設けた筒内圧検出手段と、前記クランク角
センサの故障を検出する故障検出手段と、クランク角セ
ンサ故障時に前記制御手段の制御を停止する停止手段と
、制御手段の制御停止後に前記各部内圧検出手段からそ
れぞれ独立して入力する筒内圧検出信号に基づいて各点
火コイルへの点火信号を出力する補助制御手段とを設け
て構成したことを特徴とする内燃機関の点火装置。
In an ignition device for an internal combustion engine, the ignition device for an internal combustion engine has a control means for sequentially and independently outputting an ignition signal from each ignition coil provided for each cylinder based on a crank angle signal from a crank angle sensor, and an in-cylinder pressure detection means provided for each cylinder. a failure detection means for detecting a failure of the crank angle sensor; a stop means for stopping the control of the control means when the crank angle sensor fails; and inputs independently from the internal pressure detection means for each part after the control of the control means is stopped. 1. An ignition device for an internal combustion engine, comprising: an auxiliary control means for outputting an ignition signal to each ignition coil based on a cylinder pressure detection signal.
JP3923087A 1987-02-24 1987-02-24 Ignitor for internal combustion engine Pending JPS63208671A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3923087A JPS63208671A (en) 1987-02-24 1987-02-24 Ignitor for internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3923087A JPS63208671A (en) 1987-02-24 1987-02-24 Ignitor for internal combustion engine

Publications (1)

Publication Number Publication Date
JPS63208671A true JPS63208671A (en) 1988-08-30

Family

ID=12547323

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3923087A Pending JPS63208671A (en) 1987-02-24 1987-02-24 Ignitor for internal combustion engine

Country Status (1)

Country Link
JP (1) JPS63208671A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100273891B1 (en) * 1997-07-18 2000-12-15 정몽규 Engine stopping preventon method in case of malfunction for crank position sensor
AU2021240225A1 (en) * 2021-04-24 2022-11-10 Arnott, Michael MR A controller and method for controlling an ignition coil when starting a spark ignition internal combustion engine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100273891B1 (en) * 1997-07-18 2000-12-15 정몽규 Engine stopping preventon method in case of malfunction for crank position sensor
AU2021240225A1 (en) * 2021-04-24 2022-11-10 Arnott, Michael MR A controller and method for controlling an ignition coil when starting a spark ignition internal combustion engine

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