JPS60135615U

JPS60135615U - Karman airflow sensor signal processing circuit

Info

Publication number: JPS60135615U
Application number: JP2321084U
Authority: JP
Inventors: 啓二青木; 正記光安; 弘一加納; 紀臣三好; 鶴岡　享彦
Original assignee: トヨタ自動車株式会社; 富士電機株式会社
Priority date: 1984-02-21
Filing date: 1984-02-21
Publication date: 1985-09-09
Also published as: JPH0212574Y2

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) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は、自動車用エンジンに配設された、従来のカル
マンエアフローセンサの構成を示す縦断面図、第２図は
、第１図の■−■線に沿う拡大横５断面図、第３図は、
本考案に係るカルマンエアフローセンサの信号処理回路
の実施例の構成を示すブ爾ツク線図、第４図は、前記実
施例で用いられている平均値検出回路の具体的回路構成
を示す回路図、第５図は、同じく発光量制御回路の具体
的回路構成を示す回路図である。２０・・・カルマンエアフローセンサボディ、２２・・
・カルマン渦発生体、２４・・・振動板、２６・・・信
号処理回路、２８・・・発光素子、３０・・・受光素子
、３２・・・比較回路、４０・・・平均値検出回路、４
２・・・発光量制御回路、Ｄｌ・・・発光ダイオード、
ＴＲ１・・・フォトトランジスタ。第１図第２図Fig. 1 is a vertical sectional view showing the configuration of a conventional Karman air flow sensor installed in an automobile engine, Fig. 2 is an enlarged horizontal 5 sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 The diagram is
A block diagram showing the configuration of an embodiment of the signal processing circuit of the Karman air flow sensor according to the present invention, and FIG. 4 is a circuit diagram showing the specific circuit configuration of the average value detection circuit used in the embodiment. , FIG. 5 is a circuit diagram showing a specific circuit configuration of the light emission amount control circuit. 20...Karman air flow sensor body, 22...
- Karman vortex generator, 24... Vibration plate, 26... Signal processing circuit, 28... Light emitting element, 30... Light receiving element, 32... Comparison circuit, 40... Average value detection circuit , 4
2... Light emission amount control circuit, Dl... Light emitting diode,
TR1...Phototransistor. Figure 1 Figure 2

Claims

[Scope of utility model registration request]

(1) A Karman vortex generator disposed in the measurement flow path, and a vibrating body that is periodically displaced by pressure fluctuations or flow velocity fluctuations that alternately occur near both side surfaces of the Karman vortex generator; A light emitting element that irradiates light to the vibrating body, a light receiving element that converts periodic changes in the amount of reflected or transmitted light due to displacement of the vibrating body into an analog signal, and comparing the output of the light receiving element with a threshold level, A signal processing circuit for a Karman air flow sensor comprising a comparison circuit for converting into a digital signal proportional to the air flow rate, comprising: a light emission amount detection means for detecting the amount of light emitted from the light emitting element; and a light emission amount detection means for detecting the amount of light emitted from the light emitting element; A signal processing circuit for a Karman air flow sensor, comprising: a light emission amount control circuit that performs feedback control of the amount of current applied to an element;

(2) A signal processing circuit for a Karman air flow sensor according to claim 1, wherein the light emission amount detection means is an average value detection circuit that detects an average value of an analog signal output from the light receiving element.