JPH01125866U - - Google Patents
Info
- Publication number
- JPH01125866U JPH01125866U JP2174888U JP2174888U JPH01125866U JP H01125866 U JPH01125866 U JP H01125866U JP 2174888 U JP2174888 U JP 2174888U JP 2174888 U JP2174888 U JP 2174888U JP H01125866 U JPH01125866 U JP H01125866U
- Authority
- JP
- Japan
- Prior art keywords
- threshold level
- signal
- outputs
- input signal
- frequency
- 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
Links
- 238000001514 detection method Methods 0.000 claims 1
- 230000000630 rising effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 7
- 239000013256 coordination polymer Substances 0.000 description 1
Landscapes
- Ignition Installations For Internal Combustion Engines (AREA)
Description
第１図は本考案の一実施例を示す回路図、第２
図は第１図示の回路における信号波形図、第３図
は第１の従来例を示す回路図、第４図は第３図示
の回路における信号波形図、第５図は第２の従来
例を示す回路図、第６図は第５図示の回路におけ
る信号波形図である。
ＭＣ……マイコン、ＣＰ……コンパレータ、Ｒ
１，〜Ｒ６……抵抗、Ｄ１〜Ｄ４……ダイオード
。
Figure 1 is a circuit diagram showing one embodiment of the present invention;
The figure is a signal waveform diagram in the circuit shown in Figure 1, Figure 3 is a circuit diagram showing the first conventional example, Figure 4 is a signal waveform diagram in the circuit shown in Figure 3, and Figure 5 is a diagram showing the second conventional example. The circuit diagram shown in FIG. 6 is a signal waveform diagram in the circuit shown in FIG. MC...Microcomputer, CP...Comparator, R
1 , ~ R6 ...resistor, D1 ~ D4 ...diode.
Claims (1)
信号を入力し、その入力信号のゼロクロス点近傍
を立上がり又は立下がりとするパルス信号を出力
する電磁ピツクアツプ式センサの信号処理回路で
あつて、前記入力信号をスレツシユホルドレベル
と比較して比較結果に応じたレベルの信号を出力
するコンパレータと、ゼロ電位近傍の略一定の第
１スレツシユホルドレベルを発生する第１スレツ
シユホルドレベル発生回路と、該第１スレツシユ
ホルドレベルよりも一定値だけ大きな第２スレツ
シユホルドレベルを発生させる第２スレツシユホ
ルドレベル発生回路と、前記入力信号の周波数を
計測する周波数検出手段と、該周波数検出手段で
検出した入力信号の周波数が所定値以上であると
きに第１のスレツシユホルドレベルから第２スレ
ツシユホルドレベルに選択的に切換えて前記コン
パレータに出力するスレツシユホルドレベル切換
え手段と、を含んで構成されることを特徴とする
電磁ピツクアツプ式センサの信号処理回路。 A signal processing circuit for an electromagnetic pick-up sensor which inputs one cycle of an alternating current signal from an electromagnetic pick-up sensor and outputs a pulse signal whose rising or falling edge is near the zero-crossing point of the input signal. a comparator that compares the voltage with a threshold level and outputs a signal with a level corresponding to the comparison result; a first threshold level generation circuit that generates a substantially constant first threshold level near zero potential; a second threshold level generation circuit that generates a second threshold level that is larger than the first threshold level by a certain value; a frequency detection means that measures the frequency of the input signal; Threshold level switching means selectively switches from a first threshold level to a second threshold level and outputs it to the comparator when the frequency of the input signal is equal to or higher than a predetermined value. A signal processing circuit for an electromagnetic pick-up type sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2174888U JPH01125866U (en) | 1988-02-23 | 1988-02-23 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2174888U JPH01125866U (en) | 1988-02-23 | 1988-02-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01125866U true JPH01125866U (en) | 1989-08-28 |
Family
ID=31239251
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2174888U Pending JPH01125866U (en) | 1988-02-23 | 1988-02-23 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01125866U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5337246A (en) * | 1977-09-07 | 1978-04-06 | Automob Antipollut & Saf Res Center | Signal circuit for contactless ignition apparatus |
| JPS5413839A (en) * | 1977-07-05 | 1979-02-01 | Toshiba Corp | Input detection circuit of ignition system |
-
1988
- 1988-02-23 JP JP2174888U patent/JPH01125866U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5413839A (en) * | 1977-07-05 | 1979-02-01 | Toshiba Corp | Input detection circuit of ignition system |
| JPS5337246A (en) * | 1977-09-07 | 1978-04-06 | Automob Antipollut & Saf Res Center | Signal circuit for contactless ignition apparatus |
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