JPH0454180B2 - - Google Patents
Info
- Publication number
- JPH0454180B2 JPH0454180B2 JP57132169A JP13216982A JPH0454180B2 JP H0454180 B2 JPH0454180 B2 JP H0454180B2 JP 57132169 A JP57132169 A JP 57132169A JP 13216982 A JP13216982 A JP 13216982A JP H0454180 B2 JPH0454180 B2 JP H0454180B2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- output
- multivibrator
- circuit
- comparator
- 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
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
- G01P3/4802—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage by using electronic circuits in general
- G01P3/4807—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage by using electronic circuits in general by using circuits for the detection of the pulses delivered by the ignition system of an internal combustion engine
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、自動車エンジンのタコメータ、エン
ジン制御用等の信号を得るための回転数検出器に
関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a tachometer for an automobile engine, a rotation speed detector for obtaining signals for engine control, and the like.
（従来の技術）
第１図は従来の回転数検出器の回路構成図で、
１はバツテリであり、点火コイル２の一次側でポ
イント３が開いた時発生する100〜200Vのインパ
ルス〔第２図ａで示す波形〕を整流し、トランジ
スタQ1がONする基準電圧V1より高い入力がある
と、単安定マルチバイブレータ回路４がトリガさ
れて、第２図ｂに示すような回転数に応じたパル
ス出力を得ていた。(Prior art) Figure 1 is a circuit diagram of a conventional rotation speed detector.
1 is a battery, which rectifies the 100 to 200 V impulse (waveform shown in Figure 2 a) generated when point 3 opens on the primary side of the ignition coil 2, and converts it from the reference voltage V 1 that turns on the transistor Q 1 . When there is a high input, the monostable multivibrator circuit 4 is triggered to obtain a pulse output depending on the rotational speed as shown in FIG. 2b.
（発明が解決しようとする問題点）
しかしながら、このような従来の回転数検出器
においては、インパルスの電圧自体が種々の条件
で大幅に変動し、ノイズとの区別がつきにくく、
誤動作を生ずるという問題があつた。(Problems to be Solved by the Invention) However, in such conventional rotation speed detectors, the impulse voltage itself fluctuates significantly under various conditions, making it difficult to distinguish it from noise.
There was a problem with malfunctions.
本発明は、点火コイルから得られる信号に含ま
れるノイズにより単安定マルチバイブレータが再
トリガされないようにして、正確に回転数の検出
を行うことを目的とするものである。 An object of the present invention is to accurately detect the rotational speed while preventing the monostable multivibrator from being retriggered due to noise contained in the signal obtained from the ignition coil.
（問題点を解決するための手段）
本発明は、
内燃機関の点火コイルの一次電圧を入力とし、
この電圧を整流、積分する整流器、抵抗、コンデ
ンサと、積分された電圧を定電圧化する定電圧素
子と、この電圧を検出する電圧比較器と、この出
力によつてセツトされる双安定マルチバイブレー
タと、この出力によつてトリガされる単安定マル
チバイブレータと、この単安定マルチバイブレー
タの出力と電圧比較器の出力の否定論理和によつ
て双安定マルチバイブレータをリセツトするよう
に接続されたノア回路と、単安定マルチバイブレ
ータの出力と双安定マルチバイブレータの出力を
入力とし、その出力端より出力パルスを得る論理
積回路から成り、積分された電圧が電圧比較器の
基準電圧より高い間は、単安定マルチバイブレー
タが再トリガされないことを特徴とするものであ
る。(Means for Solving the Problems) The present invention uses the primary voltage of the ignition coil of an internal combustion engine as input,
A rectifier, a resistor, and a capacitor that rectify and integrate this voltage, a constant voltage element that makes the integrated voltage a constant voltage, a voltage comparator that detects this voltage, and a bistable multivibrator that is set by this output. , a monostable multivibrator triggered by this output, and a NOR circuit connected to reset the bistable multivibrator by the NOR of the output of this monostable multivibrator and the output of the voltage comparator. It consists of an AND circuit that takes the output of a monostable multivibrator and the output of a bistable multivibrator as input, and obtains an output pulse from its output terminal.As long as the integrated voltage is higher than the reference voltage of the voltage comparator, the The stable multivibrator is characterized in that it is not retriggered.
（作用）
電圧比較器の出力と単安定マルチバイブレータ
の出力が共に“Ｌ”にならなければ双安定マルチ
バイブレータがリセツトされないようになつてい
るので、整流器、抵抗、コンデンサ、定電圧素子
によつて積分、波形成形された電圧が、電圧比較
器のしきい値レベルより高い間は単安定マルチバ
イブレータは再トリガされることはなく、インパ
ルスの電圧自体が種々の条件で変動しても、ノイ
ズとの区別がつかないことがなく、誤動作するこ
とがない。(Function) Since the bistable multivibrator is not reset unless the output of the voltage comparator and the output of the monostable multivibrator both become "L", the rectifier, resistor, capacitor, and constant voltage element As long as the integrated, waveformed voltage is above the threshold level of the voltage comparator, the monostable multivibrator will not be retriggered, and even if the impulse voltage itself varies under various conditions, noise and There is no possibility of indistinguishability and no malfunction.
（実施例）
第３図は本発明による回転数検出器の実施例を
示す図で、１０はバツテリ、１１は点火コイル、
１２はポイントである。まず、ポイント１２が開
いた時、点火コイル１１から発生した電圧波形
〔第４図ａ〕は、ダイオードD1によつて整流さ
せ、抵抗R1、コンデンサC1からなる積分回路に
よつて積分され、第４図ｂの如き波形が得られ
る。そして、定電圧素子として動作するツイナー
ダイオードZD1は、コンデンサC1の充電電圧がツ
エナー電圧以上に高くならないようにし、ポイン
ト１２が閉じた後のコンデンサC1の放電時間を
短くし、高速回転時に次の入力信号と重なつてし
まうことを防いでいるもので、このツエナーダイ
オードZD1の働きを第５図に示す。第５図ａは低
速回転時、同図ｂは高速回転時を示し、実線がツ
エナーダイオードZD1のない時のコンデンサC1の
端子電圧、点線はツエナーダイオードZD1を設け
た時の端子電圧波形である。次に、抵抗R1、コ
ンデンサC1により積分された電圧は、電圧比較
器（以下コンパレータと記す）１３によつて、基
準電圧V1と比較され、コンパレータの出力が
“Ｈ”になると、双安定マルチバイブレータ
（Ｆ・Ｆ）１４がセツトされる。また、同図中の
Q1，C2，R3及びコンパレータ１５は、単安定マ
ルチバイブレータを構成しており、（Ｆ・Ｆ）１
４がセツトされるとTrQ1がOFFになり、コンデ
ンサC2が抵抗R3を通して充電される。そして、
コンデンサC2の電圧は、コンパレータ１５の反
転入力に加えられて基準電圧V2と比較され、基
準電圧V2より高くなるとコンパレータ１５の出
力は“Ｌ”になる。こうして、（Ｆ・Ｆ）１４が
セツトされてから、コンパレータ１５が“Ｌ”に
なるまでの時間幅が単安定マルチバイブレータ出
力として論理積回路（以下AND回路と記す）１
６から出力される〔第４図ｄ〕。次に、ポイント
１２が閉じ、コンデンサC1が放電され、コンパ
レータ１３，１５の出力が共に“Ｌ”になると、
（Ｆ・Ｆ）１４はノア回路（以下NOR回路と記
す）１７の出力によつてリセツトされ、次の入力
を受け付けられる状態となる。この結果、AND
回路１６の出力には回転数に応じた一定幅のパル
ス出力が得られる。(Embodiment) FIG. 3 is a diagram showing an embodiment of the rotation speed detector according to the present invention, in which 10 is a battery, 11 is an ignition coil,
12 is a point. First, when point 12 is opened, the voltage waveform [Fig. 4a] generated from the ignition coil 11 is rectified by the diode D 1 and integrated by the integrating circuit consisting of the resistor R 1 and the capacitor C 1 . , a waveform as shown in FIG. 4b is obtained. And the zener diode ZD 1 , which operates as a constant voltage element, prevents the charging voltage of the capacitor C 1 from becoming higher than the zener voltage, shortens the discharging time of the capacitor C 1 after point 12 closes, and allows high speed rotation. This zener diode ZD 1 prevents it from sometimes overlapping with the next input signal, and the function of this Zener diode ZD 1 is shown in Figure 5. Figure 5a shows the low-speed rotation, and Figure 5b shows the high-speed rotation.The solid line is the terminal voltage of capacitor C1 without the Zener diode ZD1 , and the dotted line is the terminal voltage waveform when the Zener diode ZD1 is installed. It is. Next, the voltage integrated by the resistor R 1 and the capacitor C 1 is compared with the reference voltage V 1 by a voltage comparator (hereinafter referred to as a comparator) 13, and when the output of the comparator becomes “H”, the voltage is A stable multivibrator (F.F) 14 is set. Also, in the same figure
Q 1 , C 2 , R 3 and comparator 15 constitute a monostable multivibrator, and (F・F)1
When 4 is set, TrQ 1 is turned off and capacitor C 2 is charged through resistor R 3 . and,
The voltage of the capacitor C2 is applied to the inverting input of the comparator 15 and compared with the reference voltage V2 , and when it becomes higher than the reference voltage V2 , the output of the comparator 15 becomes "L". In this way, the time width from when (F・F) 14 is set until the comparator 15 becomes "L" is the output of the AND circuit (hereinafter referred to as AND circuit) 1 as a monostable multivibrator output.
6 [Fig. 4 d]. Next, point 12 closes, capacitor C1 is discharged, and the outputs of comparators 13 and 15 both become "L".
(F.F) 14 is reset by the output of the NOR circuit (hereinafter referred to as NOR circuit) 17, and becomes ready to accept the next input. As a result, AND
As the output of the circuit 16, a pulse output having a constant width depending on the rotation speed is obtained.
（発明の効果）
本発明によれば、点火コイルの一次側に発生す
る電圧を長い時定数回路で積分し定電圧化し、単
安定マルチバイブレータの出力パルス幅より長い
パルス幅のパルスに成形するとともに、NOR回
路１７によつて、電圧比較器１３の出力と単安定
マルチバイブレータ１５の出力が共に“Ｌ”にな
らなければ双安定マルチバイブレータ１４がリセ
ツトされないようになつているので、整流器D1、
抵抗R1，R2、コンデンサC1、定電圧素子ZD1に
よつて積分、波形成形された電圧が、電圧比較器
１３のしきい値レベルより高い間（整流器、抵
抗、コンデンサ、定電圧素子の特性の選択によつ
て選定できる）は単安定マルチバイブレータは再
トリガされることはなく、インパルスの電圧自体
が種々の条件で変動しても、ノイズとの区別がつ
かないことがなく、誤動作することがないから、
正確な回転数が検出できる。(Effects of the Invention) According to the present invention, the voltage generated on the primary side of the ignition coil is integrated by a long time constant circuit to make it a constant voltage, and is shaped into a pulse with a pulse width longer than the output pulse width of a monostable multivibrator. , NOR circuit 17 prevents the bistable multivibrator 14 from being reset unless both the output of the voltage comparator 13 and the output of the monostable multivibrator 15 become "L", so that the rectifier D 1 ,
While the voltage integrated and waveform-shaped by the resistors R 1 , R 2 , capacitor C 1 , and constant voltage element ZD 1 is higher than the threshold level of the voltage comparator 13 (rectifier, resistor, capacitor, constant voltage element A monostable multivibrator (which can be selected by selecting the characteristics of Because there's nothing to do,
Accurate rotation speed can be detected.
第１図は従来の回転数検出器の回路構成図、第
２図はその波形図、第３図は本発明による回転数
検出器の実施例の回路構成図、第４図は各部にお
ける電圧波形図、第５図はツエナーダイオードの
機能を示す波形図である。
１０……バツテリ、１１……点火コイル、１２
……ポイント、１３，１５……電圧比較器（コン
パレータ）、１４……双安定マルチバイブレータ
（Ｆ・Ｆ）、１６……論理積回路（AND回路）、１
７……ノア回路（NOR回路）。
Fig. 1 is a circuit diagram of a conventional rotation speed detector, Fig. 2 is a waveform diagram thereof, Fig. 3 is a circuit diagram of an embodiment of the rotation speed detector according to the present invention, and Fig. 4 is a voltage waveform at each part. FIG. 5 is a waveform diagram showing the function of a Zener diode. 10... Battery, 11... Ignition coil, 12
... Point, 13, 15 ... Voltage comparator (comparator), 14 ... Bistable multivibrator (FF), 16 ... AND circuit (AND circuit), 1
7...NOR circuit (NOR circuit).
Claims (1)
し、この電圧を整流、積分する整流器、抵抗、コ
ンデンサと、積分された電圧を定電圧化する定電
圧素子と、この電圧を検出する電圧比較器と、こ
の出力によつてセツトされる双安定マルチバイブ
レータと、この出力によつてトリガされる単安定
マルチバイブレータと、この単安定マルチバイブ
レータの出力と電圧比較器の出力の否定論理和に
よつて双安定マルチバイブレータをリセツトする
ように接続されたノア回路と、単安定マルチバイ
ブレータの出力と双安定マルチバイブレータの出
力を入力とし、その出力端より出力パルスを得る
論理積回路から成り、積分された電圧が電圧比較
器の基準電圧より高い間は、単安定マルチバイブ
レータが再トリガされないことを特徴とする回転
数検出器。1 A rectifier, a resistor, and a capacitor that input the primary voltage of the ignition coil of the internal combustion engine and rectify and integrate this voltage, a constant voltage element that makes the integrated voltage a constant voltage, and a voltage comparator that detects this voltage. , a bistable multivibrator set by this output, a monostable multivibrator triggered by this output, and a bistable multivibrator set by this output, and a bistable multivibrator set by the NOR of the output of this monostable multivibrator and the output of the voltage comparator. It consists of a NOR circuit connected to reset the stable multivibrator, and an AND circuit that takes the output of the monostable multivibrator and the output of the bistable multivibrator as input, and obtains an output pulse from the output terminal, and calculates the integrated voltage. A rotation speed detector characterized in that the monostable multivibrator is not retriggered while is higher than the reference voltage of the voltage comparator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57132169A JPS5923256A (en) | 1982-07-30 | 1982-07-30 | Revolution number detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57132169A JPS5923256A (en) | 1982-07-30 | 1982-07-30 | Revolution number detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5923256A JPS5923256A (en) | 1984-02-06 |
| JPH0454180B2 true JPH0454180B2 (en) | 1992-08-28 |
Family
ID=15074974
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57132169A Granted JPS5923256A (en) | 1982-07-30 | 1982-07-30 | Revolution number detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5923256A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6122945A (en) * | 1984-07-10 | 1986-01-31 | 東洋リノリユ−ム株式会社 | Ceramic-like decorative material |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS541672A (en) * | 1977-06-06 | 1979-01-08 | Nec Corp | Tachometer device |
| JPS58195873U (en) * | 1982-06-21 | 1983-12-26 | カルソニックカンセイ株式会社 | tachometer circuit |
-
1982
- 1982-07-30 JP JP57132169A patent/JPS5923256A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5923256A (en) | 1984-02-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4169232A (en) | Signal conditioning circuit for magnetic sensing means | |
| US4409937A (en) | Spark timing control device for an internal combustion engine | |
| EP0047394A1 (en) | Engine knock control apparatus | |
| EP0516687B1 (en) | Signal conditioning circuit | |
| JPH0454180B2 (en) | ||
| JPS5965225A (en) | Knocking detecting device for internal combustion engine | |
| JPH061214B2 (en) | Detection device for notching combustion of internal combustion engine | |
| JPS6232352B2 (en) | ||
| JP4695806B2 (en) | Inductive rotational speed sensor input circuit | |
| JPS60119372A (en) | Electronic advance ignition system | |
| JPS60198374A (en) | Ignition timing control equipment for internal- combustion engine | |
| US4610232A (en) | Ignition timing control apparatus for internal combustion engine | |
| US4250450A (en) | Detection of engine speed in response to ignition operation | |
| JPS5830135Y2 (en) | Closing angle detection device for internal combustion engine ignition system | |
| JP3820998B2 (en) | Rotation detector | |
| JPS6242146B2 (en) | ||
| JPS6122141B2 (en) | ||
| JPS5914767Y2 (en) | Rotation speed detection device | |
| JPH0336146B2 (en) | ||
| US4487059A (en) | Circuit for producing pulses indicative of speed from a rotary generator without timing shift | |
| JPH0230931Y2 (en) | ||
| JPS5819855B2 (en) | Non-contact ignition device | |
| JPS608466A (en) | Ignition apparatus of internal combustion engine | |
| JPS62461B2 (en) | ||
| JPH028146B2 (en) |