JPH0672591B2 - Notting control device - Google Patents
Notting control deviceInfo
- Publication number
- JPH0672591B2 JPH0672591B2 JP59141949A JP14194984A JPH0672591B2 JP H0672591 B2 JPH0672591 B2 JP H0672591B2 JP 59141949 A JP59141949 A JP 59141949A JP 14194984 A JP14194984 A JP 14194984A JP H0672591 B2 JPH0672591 B2 JP H0672591B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- knocking
- wave rectified
- output
- 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.)
- Expired - Lifetime
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)
- Measuring Fluid Pressure (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Testing Of Engines (AREA)
- Electrical Control Of Ignition Timing (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Analogue/Digital Conversion (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、内燃機関などのノッキングを検出し点火時期
を制御するノッキング制御装置に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a knocking control device that detects knocking of an internal combustion engine and controls ignition timing.
従来例の構成とその問題点 第１図は従来のノッキング制御装置を示している。以下
にこの従来例の構成について第１図とともに説明する。
第１図において、１はノッキングセンサ、２はコンデン
サ、３はバッファ、４、５、６は抵抗、７は増幅器、８
は抵抗、９は半波整流回路であり、この半波整流回路９
はコンデンサ10、抵抗11、12、13、ダイオード14、15、
増幅器16で構成される。17は比較器、18は平均化回路で
あり、この平均化回路18は抵抗19及びコンデンサ20で構
成される。21はD/A変換器、22はA/D変換器、23〜25は出
力レベル変換用のバッファ、26はマイクロコンピュー
（以下CPUと称す）である。また、27、28は抵抗、29は
増巾器、30はコンデンサ、31は増幅器、32はパワートラ
ンジスタ、33は点火コイル、34は点火プラグ、35は角度
検出器、36はバッファである。Configuration of Conventional Example and Problems Thereof FIG. 1 shows a conventional knocking control device. The structure of this conventional example will be described below with reference to FIG.
In FIG. 1, 1 is a knocking sensor, 2 is a capacitor, 3 is a buffer, 4, 5, 6 are resistors, 7 is an amplifier, 8
Is a resistor and 9 is a half-wave rectifier circuit.
Is a capacitor 10, resistors 11, 12, 13, diodes 14, 15,
It is composed of an amplifier 16. Reference numeral 17 is a comparator, 18 is an averaging circuit, and this averaging circuit 18 is composed of a resistor 19 and a capacitor 20. 21 is a D / A converter, 22 is an A / D converter, 23 to 25 are buffers for output level conversion, and 26 is a micro computer (hereinafter referred to as CPU). Further, 27 and 28 are resistors, 29 is an amplifier, 30 is a capacitor, 31 is an amplifier, 32 is a power transistor, 33 is an ignition coil, 34 is an ignition plug, 35 is an angle detector, and 36 is a buffer.
次に上記従来例の動作について説明する。第１図におい
て、ノッキングセンサ２の出力はバッファ３でインピー
ダンス変換され、一方は比較器17に入り、他方は半波整
流増巾器19で増巾及び半波整流される。この半波整流出
力は平均化回路18で平均化され、A/D変換器22でA/D変換
され、CPU26に入力される。CPU26はこのAD変換値をある
定数で修飾してD/A変換器21に出力し、基準信号を作
る。比較器17は、ノッキングセンサ出力と前記D/A変換
器21からの基準信号を比較し、基準信号よりノッキング
センサ信号が大きいときパルスを出力し、ノッキング有
と判定した出力をCPU26へ入力する。CPU26は、角度位置
検出器31の点火タイミング信号とノッキング判定出力よ
り、点火タイミング出力信号を出力し、パワートランジ
スタ32を駆動して点火プラグ34に点火信号を与える。と
ころでノッキングセンサ信号を信号処理するバッファ
３、半波整流増巾器９、比較器17及びD/A変換器21やA/D
変換器22の電源電圧はバッテリの電圧や信号及び回路の
ダイナミックレンジなどから８〜9Vに選定されるのが一
般的である。また回路の中点電位は電源電圧の一般に1/
2近傍に選ばれ、電源電圧を8Vとすると、中点電位は4V
となる。センサ信号はバッファ３でインピーダンス変換
され中点電位を中心として信号がふれ、中点電位より高
いレベルの信号が半波整流され平均化される。これらの
信号レベルは電源電圧8Vの全域にわたるため、センサ信
号の処理結果を5Vで動作しているCPU26に直接つなぐこ
とができない。第２図は上記従来例の各部の波形を示し
ている。第２図において、ａは点火タイミング信号、ｂ
はセンサ信号でバッファ３の出力波形と基準信号、Ｃは
半波整流増巾器の出力と平均化回路18の出力である。Next, the operation of the above conventional example will be described. In FIG. 1, the output of the knocking sensor 2 is impedance-converted by the buffer 3, one of which enters the comparator 17 and the other of which is amplified and half-wave rectified by the half-wave rectifying and amplifying device 19. The half-wave rectified output is averaged by the averaging circuit 18, A / D converted by the A / D converter 22, and input to the CPU 26. The CPU 26 modifies this AD conversion value with a certain constant and outputs it to the D / A converter 21 to create a reference signal. The comparator 17 compares the knocking sensor output with the reference signal from the D / A converter 21, outputs a pulse when the knocking sensor signal is larger than the reference signal, and inputs the output determined to have knocking to the CPU 26. The CPU 26 outputs an ignition timing output signal from the ignition timing signal and the knocking determination output of the angular position detector 31, drives the power transistor 32, and gives an ignition signal to the ignition plug 34. By the way, the buffer 3 for processing the knocking sensor signal, the half-wave rectifier and amplifier 9, the comparator 17, the D / A converter 21, and the A / D.
The power supply voltage of the converter 22 is generally selected to be 8 to 9 V in view of the voltage of the battery, the signal and the dynamic range of the circuit. The midpoint potential of the circuit is generally 1 /
2 is selected and the power supply voltage is 8V, the midpoint potential is 4V
Becomes The sensor signal is impedance-converted by the buffer 3 and the signal fluctuates around the midpoint potential, and a signal having a level higher than the midpoint potential is half-wave rectified and averaged. Since these signal levels extend over the entire power supply voltage of 8V, the processing result of the sensor signal cannot be directly connected to the CPU 26 operating at 5V. FIG. 2 shows the waveform of each part of the above conventional example. In FIG. 2, a is an ignition timing signal, b
Is a sensor signal, which is the output waveform of the buffer 3 and the reference signal, and C is the output of the half-wave rectifier and the averaging circuit 18.
この様に、上記従来例において、ノッキングセンサ信号
のアナログ信号処理部は信号の扱いやすさや増巾器など
のダイナミックレンジから、一般に電源電圧は８〜9Vに
選ばれる（第１図では8V）。またCPU26などデジタル信
号処理部の電源電圧は5Vが一般的である。従って、アナ
ログ信号処理部とデジタル信号処理部間にはレベル変換
が必要となる。たとえば第１図においては、比較器17及
びA/D変換器22の出力を8Vから5Vへ、またCPU26からD/A
変換器21の出力を5Vから8Vへ変換するためのバッファ2
3、24、25が必要であった。As described above, in the above conventional example, the analog signal processing unit for the knocking sensor signal is generally selected to have a power supply voltage of 8 to 9V (8V in FIG. 1) in view of the ease of handling the signal and the dynamic range of the amplifier. The power supply voltage of the digital signal processing unit such as the CPU 26 is generally 5V. Therefore, level conversion is required between the analog signal processing section and the digital signal processing section. For example, in FIG. 1, the output of the comparator 17 and the A / D converter 22 is changed from 8V to 5V, and the output from the CPU 26 is changed to D / A.
Buffer 2 to convert the output of converter 21 from 5V to 8V
3, 24, 25 were needed.
発明の目的 本発明は、上記従来の欠点を除去するものであり、電源
電圧の異なるアナログ処理部とデジタル処理との間のレ
ベルコンバータを不要とし、回路構成を簡単にすること
を目的とするものである。An object of the present invention is to eliminate the above-mentioned conventional drawbacks, and an object of the present invention is to simplify the circuit configuration by eliminating the need for a level converter between an analog processing unit and a digital processing unit having different power supply voltages. Is.
発明の構成 本発明は、上記目的を達成するために、センサ信号のノ
ッキング判定を中点電位より低い信号レベルで処理する
ために、CPUなど5V電源で動作しているデジタル信号処
理部と直接結合することができ、回路を簡素化できる効
果を得るものである。In order to achieve the above object, the present invention is directly coupled with a digital signal processing unit operating on a 5V power supply such as a CPU in order to process knocking determination of a sensor signal at a signal level lower than a midpoint potential. Therefore, the effect of simplifying the circuit can be obtained.
実施例の説明 以下に本発明の一実施例の構成について、図面とともに
説明する。Description of Embodiments A configuration of an embodiment of the present invention will be described below with reference to the drawings.
第３図において、１はノッキングセンサ、２はコンデン
サ、３はバッファ、４、５、６は抵抗、７は増巾器、８
は抵抗、９は半波整流器であり、この半波整流器９はコ
ンデンサ10、抵抗11、12、13、ダイオード14、15、増巾
器16で構成される。18は平均化回路であり、この平均化
回路18は抵抗19、コンデンサ20で構成される。17は比較
器、21はD/A変換器、22はA/D変換器、26はCPU、27、28
は抵抗、29は増巾器、30はコンデンサ、31はバッファ、
32はパワートランジスタ、33は点火コイル、34は点火プ
ラグ、35は角度位置検出器、36はバッファ、37はダイオ
ードである。In FIG. 3, 1 is a knocking sensor, 2 is a capacitor, 3 is a buffer, 4, 5, 6 are resistors, 7 is an amplifier, and 8
Is a resistor, and 9 is a half-wave rectifier. This half-wave rectifier 9 is composed of a capacitor 10, resistors 11, 12, and 13, diodes 14 and 15, and an amplifier 16. 18 is an averaging circuit, and this averaging circuit 18 is composed of a resistor 19 and a capacitor 20. 17 is a comparator, 21 is a D / A converter, 22 is an A / D converter, 26 is a CPU, 27, 28
Is a resistor, 29 is an amplifier, 30 is a capacitor, 31 is a buffer,
32 is a power transistor, 33 is an ignition coil, 34 is a spark plug, 35 is an angular position detector, 36 is a buffer, and 37 is a diode.
第３図において、ノッキングセンサ１の信号はバッファ
３によりインピーダンス変換され、中点電位4Vを中心に
信号が出る。バッファ３の信号の１つは比較器17に入力
されるが、5Vに結線されたダイオード37により、5V＋VD
（VDはダイオード37の順方向電圧）によりクランプされ
るので5Vで動作する比較器17に直接結線できる。またバ
ッファ３出力のもう一方は、反転増巾器７により増巾さ
れ、半波整流器９により半波整流される。しかしながら
この半波整流器９の出力は、従来例と違いダイオード14
及び15の向きが逆のため第２図ｃの波形と異なり、中点
電位より低い信号が半波整流される。この出力を平均化
回路９で平均した出力は、中点電位以下のレベルである
から5Vで動作するA/D変換器22に直接入力できる。従っ
て、前記A/D変換器22出力をもとに、ノッキングを判定
する基準信号を発生するD/A変換器21も5Vで動作できる
ので、アナログ処理部とデジタル処理部が直接接続する
ことができる。In FIG. 3, the signal of the knocking sensor 1 is impedance-converted by the buffer 3 and a signal is output centering on the midpoint potential 4V. One of the signals of the buffer 3 is input to the comparator 17, but it is 5V + V D due to the diode 37 connected to 5V.
Since it is clamped by (V D is the forward voltage of the diode 37), it can be directly connected to the comparator 17 operating at 5V. The other output of the buffer 3 is amplified by the inverting amplifier 7 and half-wave rectified by the half-wave rectifier 9. However, the output of the half-wave rectifier 9 is different from that of the conventional example by the diode 14
Since the directions of 15 and 15 are opposite, the signal lower than the midpoint potential is half-wave rectified unlike the waveform of FIG. 2c. The output obtained by averaging this output by the averaging circuit 9 is at a level below the midpoint potential, and therefore can be directly input to the A / D converter 22 operating at 5V. Therefore, based on the output of the A / D converter 22, the D / A converter 21 that generates a reference signal for determining knocking can also operate at 5 V, so that the analog processing unit and the digital processing unit can be directly connected. it can.
第３図においては半波整流器９に反転増巾器を用いた
が、第４図の様に非反転増巾器９′を用いても同様の効
果が得られる。Although the inverting thickener 9 is used as the half-wave rectifier 9 in FIG. 3, the same effect can be obtained by using the non-inverting thickener 9'as shown in FIG.
第５図に上記実施例の各部の波形を示す。第５図かかわ
かる様に、ノッキングセンサ信号の判定及び処理は、中
点電位（例えば4V）以下で行なうのでCPUなど5Vで動作
するデジタル信号処理部と直接結線できる。FIG. 5 shows the waveform of each part of the above embodiment. As can be seen from FIG. 5, the determination and processing of the knocking sensor signal are performed at the midpoint potential (for example, 4V) or less, so that the signal can be directly connected to a digital signal processing unit operating at 5V such as a CPU.
発明の効果 本発明は上記の様な構成であり、８〜10Vの電源電圧で
アナログ処理されるセンサ信号を5Vの電源電圧のデジタ
ル回路ととくにレベルコンバータを介さずに直接結線で
きる利点を有する。EFFECTS OF THE INVENTION The present invention is configured as described above, and has an advantage that a sensor signal which is analog-processed with a power supply voltage of 8 to 10 V can be directly connected to a digital circuit having a power supply voltage of 5 V without using a level converter.
第１図は従来のノッキング制御装置の電気回路図、第２
図は同装置の各部の波形図、第３図は本発明の一実施例
におけるノッキング制御装置の電気回路図、第４図は本
発明の他の実施例の電気回路図、第５図は同装置の各部
の波形図である。 １……ノッキングセンサ、２……コンデンサ、３……バ
ッファ、４、５、６……抵抗、７……増巾器、８……抵
抗、９……半波整流器、９′……非反転増幅器、18……
平均化回路、17……比較器、21……D/A変換器、22……A
/D変換器、26……マイクロコンピュータCPU、32……パ
ワートランジスタ、35……角度位置検出器、37……ダイ
オード。FIG. 1 is an electric circuit diagram of a conventional knocking control device, and FIG.
FIG. 3 is a waveform diagram of each part of the device, FIG. 3 is an electric circuit diagram of a knocking control device in one embodiment of the present invention, FIG. 4 is an electric circuit diagram of another embodiment of the present invention, and FIG. It is a waveform diagram of each part of the device. 1 ... knocking sensor, 2 ... capacitor, 3 ... buffer, 4,5,6 ... resistor, 7 ... amplifier, 8 ... resistor, 9 ... half-wave rectifier, 9 '... non-inverting Amplifier, 18 ……
Averaging circuit, 17 …… Comparator, 21 …… D / A converter, 22 …… A
/ D converter, 26 …… Microcomputer CPU, 32 …… Power transistor, 35 …… Angle position detector, 37 …… Diode.
Claims (1)
ンダ内の圧力によって生じる振動を検出するノッキング
センサと、このノッキングセンサの信号よりノッキング
を判定するノッキング判定回路と、該ノッキング判定回
路の出力信号および内燃機関のクランク角度を検出する
角度位置検出器の出力信号から点火時期を制御する点火
時期制御回路とを具備し、上記ノッキング判定回路はノ
ッキングセンサ信号とこのノッキングセンサ信号を半波
整流した半波整流信号に基づいて生成される基準信号と
を比較する比較器を有し、上記比較器の入力のうちノッ
キングセンサ信号入力にはノッキングセンサ信号を点火
時期制御回路の電源電圧にクランプするダイオードが結
線され、上記半波整流信号は半波整流回路の中点電位よ
り低いレベル側の信号を出力として半波整流することを
特徴とするノッキング制御装置。1. A knocking sensor for detecting pressure in a cylinder of an internal combustion engine or vibration caused by pressure in the cylinder, a knocking determination circuit for determining knocking from a signal of the knocking sensor, and an output signal of the knocking determination circuit. And an ignition timing control circuit that controls the ignition timing from the output signal of the angular position detector that detects the crank angle of the internal combustion engine, and the knocking determination circuit is a half-wave rectified half-wave rectified knocking sensor signal. A comparator for comparing with a reference signal generated based on the wave rectified signal, and a diode for clamping the knocking sensor signal to the power supply voltage of the ignition timing control circuit is provided at the knocking sensor signal input of the comparator. The half-wave rectified signal is connected and the level of the half-wave rectified signal is lower than the midpoint potential of the half-wave rectified circuit. Knock control apparatus, characterized in that the half-wave rectifies the issue as an output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59141949A JPH0672591B2 (en) | 1984-07-09 | 1984-07-09 | Notting control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59141949A JPH0672591B2 (en) | 1984-07-09 | 1984-07-09 | Notting control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6123870A JPS6123870A (en) | 1986-02-01 |
| JPH0672591B2 true JPH0672591B2 (en) | 1994-09-14 |
Family
ID=15303876
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59141949A Expired - Lifetime JPH0672591B2 (en) | 1984-07-09 | 1984-07-09 | Notting control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0672591B2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3137016C2 (en) * | 1981-09-17 | 1985-01-03 | Robert Bosch Gmbh, 7000 Stuttgart | Device for detecting knocking of an internal combustion engine |
-
1984
- 1984-07-09 JP JP59141949A patent/JPH0672591B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6123870A (en) | 1986-02-01 |
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