JPS62461B2 - - Google Patents
Info
- Publication number
- JPS62461B2 JPS62461B2 JP13512082A JP13512082A JPS62461B2 JP S62461 B2 JPS62461 B2 JP S62461B2 JP 13512082 A JP13512082 A JP 13512082A JP 13512082 A JP13512082 A JP 13512082A JP S62461 B2 JPS62461 B2 JP S62461B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- input
- signal
- voltage
- output
- 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
Links
- 238000002485 combustion reaction Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
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、点火系をもつ内燃機関において、点
火コイルの一次側に発生するインパルスを利用し
て内燃機関の回転数を検出するタコメータの入力
回路に関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an input circuit for a tachometer that detects the rotational speed of an internal combustion engine using an impulse generated on the primary side of an ignition coil in an internal combustion engine having an ignition system. .
従来例の構成とその問題点
従来、この種のタコメータ入力回路は、例えば
第１図に示すごとく、点火コイルＬの一次側に発
生するインパルスをダイオード１で整流した後、
微分回路２で微分し、その微分出力をトランジス
タ３のベースに入力し、微分出力が所定値以上の
間だけ出力端子４に出力信号が生じるように構成
されている。Conventional configuration and problems thereof Conventionally, this type of tachometer input circuit, for example as shown in FIG.
The differential circuit 2 performs differentiation, and the differential output is input to the base of a transistor 3, so that an output signal is generated at an output terminal 4 only while the differential output is equal to or greater than a predetermined value.
ところで、点火コイルの電流を切つた直後に発
生するインパルスは、種々の条件で大幅な変動を
する。このため、第１図のように従来の回路では
余裕を持たせた入力判定レベルの設定をしなけれ
ばならないが、そうするとノイズと信号の判定が
難しくなり、また、ポイント式イグナイタとフル
トラ式イグナイタとでは発生する波形が大幅に異
なるので回路定数をそれぞれ設定しなければなら
ず、共通化ができない等の欠点があつた。 Incidentally, the impulse generated immediately after the current in the ignition coil is cut off varies considerably depending on various conditions. For this reason, as shown in Figure 1, in conventional circuits, it is necessary to set the input judgment level with a margin, but this makes it difficult to distinguish between noise and signals. However, since the generated waveforms are significantly different, circuit constants must be set for each, which has the disadvantage of not being able to be standardized.
発明の目的
本発明の目的は、上記のような従来のタコメー
タ入力回路が有していた欠点を解消し、点火コイ
ルの一次側に発生したインパルスを確実にとら
え、波形整形してタコメータへの入力信号が得ら
れるようにしたタコメータ入力回路を提供するこ
とである。Purpose of the Invention The purpose of the present invention is to eliminate the drawbacks of the conventional tachometer input circuit as described above, to reliably capture the impulse generated on the primary side of the ignition coil, shape the waveform, and input it to the tachometer. It is an object of the present invention to provide a tachometer input circuit from which a signal can be obtained.
発明の構成
本発明のタコメータ入力回路は、点火コイルの
一次側に発生するインパルスを入力信号とし、こ
の入力信号を分割し分割した信号を出力信号とし
て出力端に導く電圧分割回路と、該入力信号を積
分する積分回路と、該積分回路の積分電圧が所定
値を越えた時から該積分電圧が放電してしまうま
での間、前記出力端の出力信号をカツトするスイ
ツチング回路とで構成したことを特徴としたもの
である。Composition of the Invention The tachometer input circuit of the present invention includes a voltage dividing circuit that takes an impulse generated on the primary side of an ignition coil as an input signal, divides this input signal, and guides the divided signal to an output terminal as an output signal, and the input signal and a switching circuit that cuts the output signal at the output end from when the integrated voltage of the integrating circuit exceeds a predetermined value until the integrated voltage is discharged. This is a characteristic feature.
実施例の説明
第２図は本発明によるタコメータ入力回路の一
実施例を示したものである。図において５は点火
コイルＬの一次側に発生したインパルスを整流
し、回路の入力信号とするダイオード、６および
７は電圧比較器、８は抵抗R1，R2から成る電圧
分割回路、９は抵抗R3，R4およびコンデンサC1
から成る積分回路、１０は電圧比較器７の出力電
圧でON−OFFするトランジスタを示す。電圧比
較器６のプラス入力側にはダイオード５で整流さ
れた入力信号の電圧が電圧分割回路８により分割
されて入力され、また電圧比較器７のプラス入力
側にはダイオード５からの入力信号が積分回路９
により積分されて入力される。したがつて、電圧
比較器７のプラス入力は積分回路９で積分される
時間だけ基準電圧Vaに達する時間が遅れる。基
準電圧Vaに達するとトランジスタ１０がONし、
電圧比較器６の出力をシヨートしてしまうので、
この後電圧比較器６にいかなる信号が入ろうとも
マスキングされてしまう。第３図は第２図におけ
るａ，ｂ，ｃ各部の点の電圧波形を示したもので
ある。また、第４図はさらに分り易くするため入
力に方形波が入つた場合のａ，ｂ，ｃ各部の点の
電圧波形を示したもので、これらの図からも明ら
かなように、この回路は立ち上がり時間の差の時
間ｔだけ入力を受けつける動作をするものであ
る。DESCRIPTION OF THE EMBODIMENTS FIG. 2 shows an embodiment of the tachometer input circuit according to the present invention. In the figure, 5 is a diode that rectifies the impulse generated on the primary side of the ignition coil L and uses it as an input signal to the circuit, 6 and 7 are voltage comparators, 8 is a voltage divider circuit consisting of resistors R 1 and R 2, and 9 is a voltage divider circuit consisting of resistors R 1 and R 2 . Resistors R 3 , R 4 and capacitor C 1
10 indicates a transistor that is turned on and off depending on the output voltage of the voltage comparator 7. The voltage of the input signal rectified by the diode 5 is divided by the voltage divider circuit 8 and input to the positive input side of the voltage comparator 6, and the input signal from the diode 5 is input to the positive input side of the voltage comparator 7. Integrating circuit 9
is integrated and input. Therefore, the time for the positive input of the voltage comparator 7 to reach the reference voltage Va is delayed by the time required for integration by the integrating circuit 9. When the reference voltage Va is reached, the transistor 10 turns on,
Since the output of voltage comparator 6 is shot,
After this, whatever signal enters the voltage comparator 6 will be masked. FIG. 3 shows voltage waveforms at points a, b, and c in FIG. 2. In addition, to make it easier to understand, Figure 4 shows the voltage waveforms at points a, b, and c when a square wave is input to the input.As is clear from these figures, this circuit is It operates to accept input for a time t, which is the difference in rise time.
なお、第２図に示した実施例ではそれぞれの入
力回路に電圧比較器を用いているが、第５図に示
すように二つの電圧比較器を省略して構成するこ
とも可能である。 In the embodiment shown in FIG. 2, a voltage comparator is used in each input circuit, but it is also possible to omit the two voltage comparators as shown in FIG.
発明の効果
本発明のタコメータ入力回路は、時定数のズレ
た二つの入力回路を設置し、立ち上がり時間の差
の時間だけ入力を受けつけるようにしたのでノイ
ズとは無関係になり、また、イグナイタからのイ
ンパルスの波形に大幅な変動があつても確実に動
作し、したがつて、ポイント式、フルトラ式いず
れのイグナイタでも対応できるので共通化が可能
となる。Effects of the Invention The tachometer input circuit of the present invention has two input circuits with different time constants, and receives input only for the difference in rise time, so it is independent of noise and has no relation to noise from the igniter. It operates reliably even if there are large fluctuations in the impulse waveform, and can therefore be used with either point-type or full-travel type igniters, making it possible to use them in common.
第１図は従来例を示す図、第２図は本発明の一
実施例を示す図、第３図は第２図の回路の各部に
おける電圧波形図、第４図は入力信号を方形波と
した場合の同電圧波形図、第５図は本発明の他の
実施例を示す図である。
１，５……ダイオード、２……微分回路、３，
１０……トランジスタ、４，１１……出力端子、
６，７……電圧比較器、８……電圧分割回路、９
……積分回路、Ｌ……点火コイル。
FIG. 1 is a diagram showing a conventional example, FIG. 2 is a diagram showing an embodiment of the present invention, FIG. 3 is a voltage waveform diagram at each part of the circuit in FIG. 2, and FIG. 4 is a diagram showing an input signal as a square wave. FIG. 5 is a diagram showing another embodiment of the present invention. 1, 5...Diode, 2...Differential circuit, 3,
10...transistor, 4,11...output terminal,
6, 7... Voltage comparator, 8... Voltage division circuit, 9
...Integrator circuit, L...Ignition coil.
Claims (1)
に発生するインパルスを入力信号とするタコメー
タ入力回路において、該入力信号を分割し分割し
た信号を出力信号として出力端に導く電圧分割回
路と、該入力信号を積分する積分回路と、該積分
回路の積分電圧が所定値を越えた時から放電して
しまうまでの間、前記出力端の出力信号をカツト
するスイツチング回路とからなることを特徴とす
るタコメータ入力回路。1. In a tachometer input circuit whose input signal is an impulse generated on the primary side of an ignition coil of an internal combustion engine having an ignition system, a voltage dividing circuit divides the input signal and leads the divided signal to an output terminal as an output signal; It is characterized by comprising an integrating circuit that integrates an input signal, and a switching circuit that cuts off the output signal of the output end from when the integrated voltage of the integrating circuit exceeds a predetermined value until it is discharged. Tachometer input circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57135120A JPS5926067A (en) | 1982-08-04 | 1982-08-04 | Tachometer input circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57135120A JPS5926067A (en) | 1982-08-04 | 1982-08-04 | Tachometer input circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5926067A JPS5926067A (en) | 1984-02-10 |
| JPS62461B2 true JPS62461B2 (en) | 1987-01-08 |
Family
ID=15144284
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57135120A Granted JPS5926067A (en) | 1982-08-04 | 1982-08-04 | Tachometer input circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5926067A (en) |
-
1982
- 1982-08-04 JP JP57135120A patent/JPS5926067A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5926067A (en) | 1984-02-10 |
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