JPS6284712U - - Google Patents
Info
- Publication number
- JPS6284712U JPS6284712U JP17605685U JP17605685U JPS6284712U JP S6284712 U JPS6284712 U JP S6284712U JP 17605685 U JP17605685 U JP 17605685U JP 17605685 U JP17605685 U JP 17605685U JP S6284712 U JPS6284712 U JP S6284712U
- Authority
- JP
- Japan
- Prior art keywords
- hot wire
- resistor
- temperature compensation
- bridge circuit
- differential amplifier
- 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
- 239000000853 adhesive Substances 0.000 claims 1
- 230000001070 adhesive effect Effects 0.000 claims 1
- 238000002485 combustion reaction Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Measuring Volume Flow (AREA)
Description
第１図は本考案の一実施例を示す回路図、第２
図は従来例を示す回路図である。
Ｒｈ……熱線、Ｒｋ……温度補償抵抗、Ｒ１，
Ｒ２……固定抵抗、Ｒ３……基準抵抗、１……ブ
リツジ回路、２……差動増幅器、３……パワート
ランジスタ、４……焼切り用固定抵抗、５……ト
ランジスタ、６……バイパス用のトランジスタ。
Figure 1 is a circuit diagram showing one embodiment of the present invention, Figure 2 is a circuit diagram showing an embodiment of the present invention.
The figure is a circuit diagram showing a conventional example. Rh...heat wire, Rk...temperature compensation resistance, R1 ,
R2 ...Fixed resistance, R3 ...Reference resistor, 1...Bridge circuit, 2...Differential amplifier, 3...Power transistor, 4...Fixed resistance for burnout, 5...Transistor, 6... Bypass transistor.
Claims (1)
略同一雰囲気中に配した基準抵抗と、同じく熱線
と略同一雰囲気中に配した温度補償抵抗と固定抵
抗との直列回路と、固定抵抗とでブリツジ回路を
形成し、熱線及び基準抵抗側の分圧点と温度補償
抵抗を含む直列回路及び固定抵抗側の分圧点とを
差動増幅器に接続し、この差動増幅器によりブリ
ツジ回路への供給電流を制御しつつ、その供給電
流から吸入空気流量を測定するようにし、また、
適時的に発生する焼切り信号によりブリツジ回路
へ大電流を供給することによつて熱線への付着物
を焼切るようにした内燃機関における吸入空気流
量測定用の熱線流量計において、温度補償抵抗に
対し焼切り信号の発生時のみ導通するバイパス用
のトランジスタを並列に接続したことを特徴とす
る熱線流量計の付着部焼切り用回路。 A series circuit consisting of a hot wire installed in the intake passage of an engine, a reference resistor placed in approximately the same atmosphere as the hot wire, a temperature compensation resistor and a fixed resistor placed in approximately the same atmosphere as the hot wire, and a fixed resistor. form a bridge circuit, connect the voltage dividing point on the hot wire and reference resistor side, the series circuit including the temperature compensation resistor, and the voltage dividing point on the fixed resistor side to a differential amplifier, and use this differential amplifier to input the voltage to the bridge circuit. While controlling the supply current, the intake air flow rate is measured from the supply current, and
In a hot wire flow meter for measuring the intake air flow rate in an internal combustion engine, which burns off the deposits on the hot wire by supplying a large current to the bridge circuit in response to a timely burnout signal, a temperature compensation resistor is used. A circuit for burning out the adhesive part of a hot wire flowmeter, characterized in that a bypass transistor that is conductive only when a burning signal is generated is connected in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17605685U JPS6284712U (en) | 1985-11-18 | 1985-11-18 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17605685U JPS6284712U (en) | 1985-11-18 | 1985-11-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6284712U true JPS6284712U (en) | 1987-05-29 |
Family
ID=31115943
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17605685U Pending JPS6284712U (en) | 1985-11-18 | 1985-11-18 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6284712U (en) |
-
1985
- 1985-11-18 JP JP17605685U patent/JPS6284712U/ja active Pending
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