JPH04265474A - Combustion detector for internal combustion engine - Google Patents
Combustion detector for internal combustion engineInfo
- Publication number
- JPH04265474A JPH04265474A JP3023647A JP2364791A JPH04265474A JP H04265474 A JPH04265474 A JP H04265474A JP 3023647 A JP3023647 A JP 3023647A JP 2364791 A JP2364791 A JP 2364791A JP H04265474 A JPH04265474 A JP H04265474A
- Authority
- JP
- Japan
- Prior art keywords
- ion current
- current detection
- signal
- internal combustion
- 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.)
- Granted
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 49
- 238000001514 detection method Methods 0.000 claims abstract description 77
- 238000007493 shaping process Methods 0.000 claims abstract description 7
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 150000002500 ions Chemical class 0.000 abstract description 65
- 239000003574 free electron Substances 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 9
- 150000001450 anions Chemical class 0.000 description 6
- 150000001768 cations Chemical class 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
Classifications
-
- 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
- F02P17/00—Testing of ignition installations, e.g. in combination with adjusting; Testing of ignition timing in compression-ignition engines
- F02P17/12—Testing characteristics of the spark, ignition voltage or current
- F02P2017/125—Measuring ionisation of combustion gas, e.g. by using ignition circuits
Landscapes
- Testing Of Engines (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】この発明は、内燃機関の燃焼検出
装置に関し、特にイオン電流を確実に検出することがで
きる内燃機関の燃焼検出装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion detection device for an internal combustion engine, and more particularly to a combustion detection device for an internal combustion engine that can reliably detect ion current.
【０００２】0002
【従来の技術】図５は従来の内燃機関の燃焼検出装置を
示す構成図である。図において、１は点火信号によりオ
ン、オフするパワートランジスタ、２はパワートランジ
スタ１が１次側に接続された点火コイル、３は点火コイ
ルの２次側に接続された配電器、４は配電器３にそれぞ
れ接続された複数の点火プラグ、５はそれぞれ点火プラ
グ４に接続された複数のイオン電流検出用ダイオード、
６はイオン電流を検出するイオン電流検出装置、７はイ
オン電流検出装置６内に設けられ、イオン電流検出信号
と基準値を比較する比較器、８は出力端子である。2. Description of the Related Art FIG. 5 is a block diagram showing a conventional combustion detection device for an internal combustion engine. In the figure, 1 is a power transistor that is turned on and off by an ignition signal, 2 is an ignition coil connected to the primary side of the power transistor 1, 3 is a power distributor connected to the secondary side of the ignition coil, and 4 is a power distributor. 3, a plurality of spark plugs each connected to the spark plug 4; 5 a plurality of ion current detection diodes each connected to the spark plug 4;
6 is an ion current detection device for detecting an ion current; 7 is a comparator provided in the ion current detection device 6 to compare the ion current detection signal with a reference value; and 8 is an output terminal.
【０００３】次に、図５に示した従来の内燃機関の燃焼
検出装置の動作について図６を参照しながら説明する。
今、パワートランジスタ１のベースに図６（ａ）に示す
ような点火信号Ｓ１が印加されると、パワートランジス
タ１がオンし、このパワートランジスタ１がオフする時
点で点火コイル２の２次側に図６（ｂ）に示すような高
電圧の信号Ｓ２が発生する。この高電圧の信号Ｓ２は配
電器３を介して各気筒の点火プラグ４に供給され、これ
を点火する。この点火により気筒内の混合ガスが燃焼す
ると、イオン電流が発生し、このイオン電流のうちの陽
イオンがダイオード５を通し図６（ｃ）に示すようなイ
オン電流検出信号Ｓ３として検出され、比較器７に供給
されて基準値と比較され、出力端子８に図６（ｄ）に示
すようなイオン電流検出出力信号Ｓ４が得られる。そし
て、このイオン電流検出出力信号Ｓ４がハイレベルのと
きには燃焼、ローレベルのときには失火と判定される。Next, the operation of the conventional combustion detection device for an internal combustion engine shown in FIG. 5 will be explained with reference to FIG. 6. Now, when an ignition signal S1 as shown in FIG. 6(a) is applied to the base of the power transistor 1, the power transistor 1 is turned on, and when the power transistor 1 is turned off, the secondary side of the ignition coil 2 is A high voltage signal S2 as shown in FIG. 6(b) is generated. This high voltage signal S2 is supplied to the spark plug 4 of each cylinder via the power distributor 3, and ignites it. When the mixed gas in the cylinder burns due to this ignition, an ion current is generated, and positive ions of this ion current are detected as an ion current detection signal S3 as shown in FIG. 6(c) through the diode 5, and compared. The ion current detection output signal S4 as shown in FIG. 6(d) is obtained at the output terminal 8. When this ion current detection output signal S4 is at a high level, it is determined that there is combustion, and when it is at a low level, it is determined that there is a misfire.
【０００４】0004
【発明が解決しようとする課題】従来の内燃機関の燃焼
検出装置は以上のように、イオン電流の検出として燃焼
によって発生した陽イオンを検出しているので、特に高
速回転時や高負荷時には検出レベルが低くなり、イオン
電流の検出が不確実になるという問題点があった。この
発明は上記のような問題点を解決するためになされたも
ので、常に確実なイオン電流の検出が可能な内燃機関の
燃焼検出装置を得ることを目的とする。[Problems to be Solved by the Invention] As described above, conventional combustion detection devices for internal combustion engines detect positive ions generated by combustion as ion current detection. There was a problem that the level became low and the detection of the ion current became uncertain. The present invention was made to solve the above-mentioned problems, and an object of the present invention is to provide a combustion detection device for an internal combustion engine that can always and reliably detect an ion current.
【０００５】[0005]
【課題を解決するための手段】第１の発明に係る内燃機
関の燃焼検出装置は、内燃機関の気筒の点火プラグに正
極性の電圧を印加し、燃焼による負極性のイオン電流を
検出し、その負極性のイオン電流検出信号を出力するイ
オン電流検出手段と、上記イオン電流検出信号を正極性
の信号にに変換する変換手段と、この変換された信号を
所定の比較電圧により波形整形を行う波形整形手段とを
備えたものである。[Means for Solving the Problems] A combustion detection device for an internal combustion engine according to a first aspect of the present invention applies a positive voltage to a spark plug of a cylinder of an internal combustion engine, detects a negative ionic current due to combustion, ion current detection means for outputting the negative polarity ion current detection signal; conversion means for converting the ion current detection signal into a positive polarity signal; and waveform shaping of the converted signal using a predetermined comparison voltage. The waveform shaping means is also provided.
【０００６】第２の発明に係る内燃機関の燃焼検出装置
は、内燃機関の気筒の点火プラグに正極性の電圧を印加
し、燃焼による負極性のイオン電流を検出し、その負極
性のイオン電流検出信号を出力するイオン電流検出手段
と、上記負極性のイオン電流検出信号を所定のバイアス
電圧だけシフトするバイアス手段と、このシフトされた
負極性のイオン電流検出信号を上記バイアス電圧より所
定量シフトした第１の基準値と比較する第１の比較手段
と、この第１の比較手段の出力と第２の基準値を比較す
る第２の比較手段とを備えたものである。A combustion detection device for an internal combustion engine according to a second aspect of the invention applies a positive voltage to a spark plug in a cylinder of an internal combustion engine, detects a negative ionic current due to combustion, and detects the negative ionic current. ion current detection means for outputting a detection signal; bias means for shifting the negative ion current detection signal by a predetermined bias voltage; and shifting the shifted negative ion current detection signal by a predetermined amount from the bias voltage. The second comparison means compares the output of the first comparison means with the second reference value.
【０００７】[0007]
【作用】第１の発明においては、燃焼による負極性のイ
オン電流を検出し、その負極性のイオン電流検出信号を
正極性の信号に変換した後基準値と比較してイオン電流
検出出力信号を得る。[Operation] In the first invention, a negative ion current due to combustion is detected, the negative ion current detection signal is converted into a positive signal, and the ion current detection output signal is compared with a reference value. obtain.
【０００８】第２の発明においては、燃焼による負極性
のイオン電流を検出し、その負極性のイオン電流検出信
号を所定のバイアス電圧だけシフトし、このシフトされ
た負極性のイオン電流検出信号をバイアス電圧より所定
量シフトした第１の基準値と比較し、更に第２の基準値
と比較してイオン電流検出出力信号を得る。In the second invention, a negative ion current due to combustion is detected, the negative ion current detection signal is shifted by a predetermined bias voltage, and the shifted negative ion current detection signal is It is compared with a first reference value shifted by a predetermined amount from the bias voltage, and further compared with a second reference value to obtain an ion current detection output signal.
【０００９】[0009]
【実施例】以下、この発明の一実施例を図について説明
する。図１はこの発明の第１の実施例を示す構成図であ
り、１〜５、７、８は前述と同様のものである。６Ａは
イオン電流検出装置、９はイオン電流検出装置６Ａの入
力側に設けられた反転回路、１０は比較器７の出力側に
設けられたローパスフィルタ、１１はローパスフィルタ
１０の出力側に設けられた比較器である。そして、本実
施例では点火コイル２の２次側の一端（正極端）を配電
器５に接続し、他端（負極端）をイオン電流検出装置６
Ａに接続する。イオン電流検出用ダイオード５は配電器
３内に組み込む。又、イオン電流検出装置６Ａ内のイオ
ン電流検出用バッテリには正極性のものを使用する。つ
まり、本実施例ではイオン電流のうち陰イオン及び自由
電子を検出するようにする。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a first embodiment of the present invention, and 1 to 5, 7, and 8 are the same as those described above. 6A is an ion current detection device, 9 is an inversion circuit provided on the input side of the ion current detection device 6A, 10 is a low-pass filter provided on the output side of the comparator 7, and 11 is provided on the output side of the low-pass filter 10. It is a comparator. In this embodiment, one end (positive end) of the secondary side of the ignition coil 2 is connected to the power distributor 5, and the other end (negative end) is connected to the ion current detection device 6.
Connect to A. The ionic current detection diode 5 is incorporated into the power distributor 3. Further, a positive polarity battery is used for the ion current detection battery in the ion current detection device 6A. That is, in this embodiment, anions and free electrons are detected in the ionic current.
【００１０】次に、図１に示したこの発明の第１の実施
例の動作について図２を参照しながら説明する。今、パ
ワートランジスタ１のベースに図２（ａ）に示すような
点火信号Ｓ１が印加されると、パワートランジスタ１が
オンし、このパワートランジスタ１がオフする時点で点
火コイル２の２次側に図２（ｂ）に示すような高電圧の
信号Ｓ２が発生する。この高電圧の信号Ｓ２は配電器３
を介して各気筒の点火プラグ４に供給され、これを点火
する。この点火により気筒内の混合ガスが燃焼すると、
イオン電流が発生し、このイオン電流のうちの陰イオン
及び自由電子がダイオード５を通し図２（ｃ）に示すよ
うなイオン電流検出信号Ｓ３として検出される。このイ
オン電検出信号Ｓ３は反転回路９で反転されて図２（ｄ
）に示すような信号Ｓ４となり、比較器７に供給されて
基準値と比較され、その出力側に図２（ｅ）に示すよう
な信号Ｓ５が得られる。この信号Ｓ５はローパスフィル
タ１０を通されて図２（ｆ）に示すような信号Ｓ６とな
り、更に比較器１１に供給されて基準値と比較され、こ
の結果出力端子８に図２（ｇ）に示すようなイオン電流
検出出力信号Ｓ７が得られる。そして、このイオン電流
検出出力信号Ｓ７がハイレベルのときには燃焼、ローレ
ベルのときには失火と判定される。尚、実験等によると
、陰イオン及び自由電子の量は陽イオンの数十倍とされ
ている。従って、この場合、イオン電流の検出レベルは
充分に高い。又、比較器７の基準値は一定値でも良いし
、或は回転や負荷に応じて可変するようにしても良い。
このように、本実施例ではイオン電流の陰イオン及び自
由電子を検出し、これを正極性の信号に変換して波形処
理し、イオン電流検出出力信号を得ているので、高速回
転時や高負荷時でも確実にイオン電流を検出できる。Next, the operation of the first embodiment of the present invention shown in FIG. 1 will be explained with reference to FIG. 2. Now, when an ignition signal S1 as shown in FIG. 2(a) is applied to the base of the power transistor 1, the power transistor 1 is turned on, and when the power transistor 1 is turned off, the secondary side of the ignition coil 2 is A high voltage signal S2 as shown in FIG. 2(b) is generated. This high voltage signal S2 is transmitted to the power distributor 3
The fuel is supplied to the spark plug 4 of each cylinder via the spark plug 4, and ignites it. When the mixed gas in the cylinder burns due to this ignition,
An ion current is generated, and anions and free electrons of this ion current are detected through the diode 5 as an ion current detection signal S3 as shown in FIG. 2(c). This ion electric detection signal S3 is inverted by the inverting circuit 9 and is
) is supplied to the comparator 7, where it is compared with a reference value, and a signal S5 as shown in FIG. 2(e) is obtained at its output. This signal S5 is passed through a low-pass filter 10 to become a signal S6 as shown in FIG. 2(f), which is further supplied to a comparator 11 and compared with a reference value. An ion current detection output signal S7 as shown is obtained. When this ion current detection output signal S7 is at a high level, it is determined that there is combustion, and when it is at a low level, it is determined that there is a misfire. According to experiments, the amount of anions and free electrons is several dozen times that of cations. Therefore, in this case, the detection level of the ion current is sufficiently high. Further, the reference value of the comparator 7 may be a constant value, or may be varied depending on the rotation or load. In this way, in this example, anions and free electrons in the ion current are detected, and this is converted into a positive polarity signal and waveform processed to obtain the ion current detection output signal. Ion current can be detected reliably even under load.
【００１１】図３はこの発明の第２の実施例を示す構成
図であり、図３において、図１と対応する部分には同一
符号を付し、その詳細説明は省略する。本実施例では、
イオン電流検出装置６Ｂを設ける。このイオン電流検出
装置６Ｂは、入力側に設けられ、検出されたイオン電流
検出信号を所定のバイアス電圧分だけシフトするバイア
ス回路１２、バイアス回路１２の出力側に設けられ、シ
フトされたイオン電流検出信号をバイアス電圧より所定
量シフトした第１の基準値と比較する比較器７、比較器
７の出力側に設けられ、その出力を濾波するローパスフ
ィルタ１０、ローパスフィルタ１０の出力側に設けられ
、濾波出力と第２の基準値を比較する比較器１１、比較
器１１の出力側に設けられ、その出力を反転する反転回
路１３を有する。FIG. 3 is a block diagram showing a second embodiment of the present invention. In FIG. 3, parts corresponding to those in FIG. 1 are denoted by the same reference numerals, and detailed explanation thereof will be omitted. In this example,
An ion current detection device 6B is provided. This ion current detection device 6B includes a bias circuit 12 that is provided on the input side and shifts the detected ion current detection signal by a predetermined bias voltage, and a bias circuit 12 that is provided on the output side of the bias circuit 12 to detect the shifted ion current detection signal. A comparator 7 for comparing the signal with a first reference value shifted by a predetermined amount from the bias voltage, a low-pass filter 10 provided on the output side of the comparator 7 and filtering the output, provided on the output side of the low-pass filter 10, It has a comparator 11 that compares the filtered output with a second reference value, and an inversion circuit 13 that is provided on the output side of the comparator 11 and inverts the output.
【００１２】次に、図３に示したこの発明の第１の実施
例の動作について図４を参照しながら説明する。今、パ
ワートランジスタ１のベースに点火信号が印加されると
、パワートランジスタ１がオンし、このパワートランジ
スタ１がオフする時点で点火コイル２の２次側に高電圧
の信号が発生する。この高電圧の信号は配電器３を介し
て各気筒の点火プラグ４に供給され、これを点火する。
この点火により気筒内の混合ガスが燃焼すると、イオン
電流が発生し、このイオン電流のうちの陰イオン及び自
由電子がダイオード５を通し図４（ａ）に示すようなイ
オン電流検出信号Ｓ１として検出される。このイオン電
検出信号Ｓ１はバイアス回路１２で所定のバイアス電圧
分だけシフトされて図４（ｂ）に示すような信号Ｓ２と
なり、比較器７に供給されて第１の基準値と比較され、
その出力側に図４（ｃ）に示すような信号Ｓ３が得られ
る。この信号Ｓ３はローパスフィルタ１０を通されて図
４（ｄ）に示すような信号Ｓ４となり、更に比較器１１
に供給されて第２の基準値と比較され、その出力側に図
４（ｅ）に示すような信号Ｓ５が得られる。この信号Ｓ
５は反転回路１３で反転され、この結果出力端子８に図
４（ｆ）に示すようなイオン電流検出出力信号Ｓ６が得
られる。そして、このイオン電流検出出力信号Ｓ６がハ
イレベルのときには燃焼、ローレベルのときには失火と
判定される。このように、本実施例ではイオン電流の陰
イオン及び自由電子を検出し、その検出信号を所定量正
側にシフトして基準値と比較し、波形処理してイオン電
流検出出力信号を得ているので、高速回転時や高負荷時
でも確実にイオン電流を検出できる。Next, the operation of the first embodiment of the present invention shown in FIG. 3 will be explained with reference to FIG. 4. Now, when an ignition signal is applied to the base of the power transistor 1, the power transistor 1 is turned on, and when the power transistor 1 is turned off, a high voltage signal is generated on the secondary side of the ignition coil 2. This high voltage signal is supplied to the spark plug 4 of each cylinder via the power distributor 3 to ignite it. When the mixed gas in the cylinder burns due to this ignition, an ionic current is generated, and anions and free electrons of this ionic current are detected as an ionic current detection signal S1 as shown in FIG. 4(a) through a diode 5. be done. This ion electric detection signal S1 is shifted by a predetermined bias voltage in the bias circuit 12 to become a signal S2 as shown in FIG. 4(b), which is supplied to the comparator 7 and compared with the first reference value,
A signal S3 as shown in FIG. 4(c) is obtained on the output side. This signal S3 is passed through a low-pass filter 10 to become a signal S4 as shown in FIG.
is supplied to the output terminal and compared with the second reference value, and a signal S5 as shown in FIG. 4(e) is obtained at its output side. This signal S
5 is inverted by the inverting circuit 13, and as a result, an ion current detection output signal S6 as shown in FIG. 4(f) is obtained at the output terminal 8. When this ion current detection output signal S6 is at a high level, it is determined that there is combustion, and when it is at a low level, it is determined that there is a misfire. In this way, in this embodiment, anions and free electrons in the ion current are detected, the detection signal is shifted to the positive side by a predetermined amount, compared with a reference value, and the waveform is processed to obtain the ion current detection output signal. Therefore, the ion current can be reliably detected even during high-speed rotation or high load.
【００１３】[0013]
【発明の効果】以上のように第１の発明によれば、内燃
機関の気筒の点火プラグに正極性の電圧を印加し、燃焼
による負極性のイオン電流を検出し、その負極性のイオ
ン電流検出信号を出力するイオン電流検出手段と、上記
イオン電流検出信号を正極性の信号にに変換する変換手
段と、この変換された信号を所定の比較電圧により波形
整形を行う波形整形手段とを備えたので、高速回転時や
高負荷時でも確実にイオン電流を検出できる内燃機関の
燃焼検出装置が得られる効果がある。As described above, according to the first invention, a positive voltage is applied to the spark plug of a cylinder of an internal combustion engine, a negative ionic current due to combustion is detected, and the negative ionic current is detected. The device includes an ion current detection means for outputting a detection signal, a conversion means for converting the ion current detection signal into a positive polarity signal, and a waveform shaping means for shaping the waveform of the converted signal using a predetermined comparison voltage. Therefore, it is possible to obtain a combustion detection device for an internal combustion engine that can reliably detect ion current even during high speed rotation or high load.
【００１４】又、第２の発明によれば、内燃機関の気筒
の点火プラグに正極性の電圧を印加し、燃焼による負極
性のイオン電流を検出し、その負極性のイオン電流検出
信号を出力するイオン電流検出手段と、上記負極性のイ
オン電流検出信号を所定のバイアス電圧だけシフトする
バイアス手段と、このシフトされた負極性のイオン電流
検出信号を上記バイアス電圧より所定量シフトした第１
の基準値と比較する第１の比較手段と、この第１の比較
手段の出力と第２の基準値を比較する第２の比較手段と
を備えたので、高速回転時や高負荷時でも確実にイオン
電流を検出できる内燃機関の燃焼検出装置が得られる効
果がある。According to the second invention, a positive voltage is applied to a spark plug in a cylinder of an internal combustion engine, a negative ion current due to combustion is detected, and a negative ion current detection signal is output. bias means for shifting the negative polarity ion current detection signal by a predetermined bias voltage;
The second comparison means compares the output of the first comparison means with the second reference value, so it is reliable even during high speed rotation or high load. This has the effect of providing a combustion detection device for an internal combustion engine that can detect ion current.
【図１】この発明の一実施例を示す構成図である。FIG. 1 is a configuration diagram showing an embodiment of the present invention.
【図２】図１の動作説明に供するための波形図である。FIG. 2 is a waveform diagram for explaining the operation of FIG. 1;
【図３】この発明の他の実施例を示す構成図である。FIG. 3 is a configuration diagram showing another embodiment of the invention.
【図４】図３の動作説明に供するための波形図である。FIG. 4 is a waveform diagram for explaining the operation of FIG. 3;
【図５】従来の内燃機関の燃焼検出装置を示す構成図で
ある。FIG. 5 is a configuration diagram showing a conventional combustion detection device for an internal combustion engine.
【図６】図５の動作説明に供するための波形図である。FIG. 6 is a waveform diagram for explaining the operation of FIG. 5;
４ 点火プラグ
５ イオン電流検出用ダイオード６Ａ、６Ｂ
イオン電流検出装置７、１１ 比較器
９、１３ 反転回路
１２バイアス回路4 Spark plug 5 Ion current detection diode 6A, 6B
Ion current detection device 7, 11 Comparator 9, 13 Inversion circuit 12 Bias circuit
Claims (2)
の電圧を印加し、燃焼による負極性のイオン電流を検出
し、その負極性のイオン電流検出信号を出力するイオン
電流検出手段と、上記イオン電流検出信号を正極性の信
号にに変換する変換手段と、この変換された信号を所定
の比較電圧により波形整形を行う波形整形手段とを備え
たことを特徴とする内燃機関の燃焼検出装置。1. An ion current detection means for applying a positive voltage to a spark plug of a cylinder of an internal combustion engine, detecting a negative ion current due to combustion, and outputting a negative ion current detection signal; A combustion detection device for an internal combustion engine, comprising a conversion means for converting an ion current detection signal into a positive polarity signal, and a waveform shaping means for shaping the waveform of the converted signal using a predetermined comparison voltage. .
の電圧を印加し、燃焼による負極性のイオン電流を検出
し、その負極性のイオン電流検出信号を出力するイオン
電流検出手段と、上記負極性のイオン電流検出信号を所
定のバイアス電圧だけシフトするバイアス手段と、この
シフトされた負極性のイオン電流検出信号を上記バイア
ス電圧より所定量シフトした第１の基準値と比較する第
１の比較手段と、この第１の比較手段の出力と第２の基
準値を比較する第２の比較手段とを備えたことを特徴と
する内燃機関の燃焼検出装置。2. An ion current detection means for applying a positive voltage to a spark plug of a cylinder of an internal combustion engine, detecting a negative ion current due to combustion, and outputting a negative ion current detection signal; a bias means for shifting a negative polarity ion current detection signal by a predetermined bias voltage; and a first bias means for comparing the shifted negative polarity ion current detection signal with a first reference value shifted by a predetermined amount from the bias voltage. A combustion detection device for an internal combustion engine, comprising a comparison means and a second comparison means for comparing the output of the first comparison means with a second reference value.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3023647A JP2726766B2 (en) | 1991-02-19 | 1991-02-19 | Internal combustion engine combustion detection device |
| KR1019920001968A KR940010732B1 (en) | 1991-02-15 | 1992-02-11 | Combustion detecting apparatus for internal combustion engine |
| US07/833,796 US5230240A (en) | 1991-02-15 | 1992-02-12 | Combustion detecting apparatus for internal combustion engine |
| DE4204484A DE4204484C2 (en) | 1991-02-15 | 1992-02-14 | Combustion detector device for an internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3023647A JP2726766B2 (en) | 1991-02-19 | 1991-02-19 | Internal combustion engine combustion detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04265474A true JPH04265474A (en) | 1992-09-21 |
| JP2726766B2 JP2726766B2 (en) | 1998-03-11 |
Family
ID=12116344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3023647A Expired - Fee Related JP2726766B2 (en) | 1991-02-15 | 1991-02-19 | Internal combustion engine combustion detection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2726766B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19502402A1 (en) * | 1994-01-28 | 1995-08-10 | Mitsubishi Electric Corp | Ignition misfiring detection circuit for IC engine |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51104142A (en) * | 1975-03-12 | 1976-09-14 | Mitsubishi Motors Corp | TENKAPURAGUORYOSURUNAINENKIKANNO SHITSUKAKENSHUTSUHO |
| JPH04136485A (en) * | 1990-09-28 | 1992-05-11 | Hitachi Ltd | Detection of combustion state and device therefor in internal combustion engine |
-
1991
- 1991-02-19 JP JP3023647A patent/JP2726766B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51104142A (en) * | 1975-03-12 | 1976-09-14 | Mitsubishi Motors Corp | TENKAPURAGUORYOSURUNAINENKIKANNO SHITSUKAKENSHUTSUHO |
| JPH04136485A (en) * | 1990-09-28 | 1992-05-11 | Hitachi Ltd | Detection of combustion state and device therefor in internal combustion engine |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19502402A1 (en) * | 1994-01-28 | 1995-08-10 | Mitsubishi Electric Corp | Ignition misfiring detection circuit for IC engine |
| DE19502402C2 (en) * | 1994-01-28 | 1998-02-26 | Mitsubishi Electric Corp | Misfire sampling circuit for an internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2726766B2 (en) | 1998-03-11 |
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