JPS60141545U

JPS60141545U - O↓2 sensor - signal detection circuit

Info

Publication number: JPS60141545U
Application number: JP2895584U
Authority: JP
Inventors: 大江　秀美
Original assignee: 日本電気ホームエレクトロニクス株式会社
Priority date: 1984-02-29
Filing date: 1984-02-29
Publication date: 1985-09-19

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は０２センサ一信号検出回路の一例を示す回路図
、第２図ａ、　ｂは第１図に示す回路の各部動作波形図
、第３図は本考案による０２センサ一信号検出回路の一
実施例を示す回路図、第４図ａ′〜ｄは第３図に示す回
路の各部動作波形図である。１・・・０゜センサー、２・・・ケーブル、６・・・高
電界信号除去回路、８・・・バッファアンプ回路、９，
１５・・・コンパレータ、１５・・・マイクロコンピュ
ータ、２０・・・アンドゲート（一致検出回路）。Fig. 1 is a circuit diagram showing an example of the 02 sensor signal detection circuit, Fig. 2 a and b are operation waveform diagrams of each part of the circuit shown in Fig. 1, and Fig. 3 is a circuit diagram showing an example of the 02 sensor signal detection circuit according to the present invention. A circuit diagram showing one embodiment, FIGS. 4a' to 4d are operation waveform diagrams of various parts of the circuit shown in FIG. 3. 1...0° sensor, 2...cable, 6...high electric field signal removal circuit, 8...buffer amplifier circuit, 9,
15... Comparator, 15... Microcomputer, 20... AND gate (coincidence detection circuit).

Claims

[Scope of utility model registration request]

Detects 0° concentration contained in engine exhaust gas 0
a high-input, low-output impedance buffer amplifier circuit that receives the output signal of the 02 sensor as input, and a first comparator that generates an output when the output signal of the buffer amplifier circuit exceeds a set value that is less than the maximum output level of the 02 sensor. , a second comparator that generates an output only when the output signal of the buffer amplifier circuit is less than or equal to a set value slightly exceeding the maximum output level of the 0° sensor;
and a coincidence detection circuit that outputs only the 02 sensor signal by determining the coincidence of the Ryokawa force signals generated from the comparators of the 0□ sensor signal detection circuit.