JPH02122317U - - Google Patents
Info
- Publication number
- JPH02122317U JPH02122317U JP3092989U JP3092989U JPH02122317U JP H02122317 U JPH02122317 U JP H02122317U JP 3092989 U JP3092989 U JP 3092989U JP 3092989 U JP3092989 U JP 3092989U JP H02122317 U JPH02122317 U JP H02122317U
- Authority
- JP
- Japan
- Prior art keywords
- hot
- bridge circuit
- reference voltage
- wire
- hot wire
- 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.)
- Granted
Links
- 238000002485 combustion reaction Methods 0.000 claims 2
- 230000005855 radiation Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
Landscapes
- Measuring Volume Flow (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Description
第１図は本考案に係る熱線式流量計の一実施例
を示す回路図、第２図は従来の熱線式流量計を示
す回路図、第３図は熱線の劣化状態における吸入
空気流量の検出変化を示す線図である。
１……ブリツジ回路、２，１１……演算増幅器
、３，４……トランジスタ、１０……定電圧回路
、Ｒｈ……熱線抵抗（検出用）、Ｔｈ……温度補
償抵抗、Ｒ１〜Ｒ３，Ｒ１１〜Ｒ１５……固定抵
抗、Ｒｈｒｅｆ……基準電圧用熱線抵抗。
Fig. 1 is a circuit diagram showing an embodiment of a hot wire flowmeter according to the present invention, Fig. 2 is a circuit diagram showing a conventional hot wire flowmeter, and Fig. 3 is a detection of intake air flow rate when the hot wire is in a deteriorated state. It is a line diagram showing a change. 1... Bridge circuit, 2, 11... Operational amplifier, 3, 4... Transistor, 10... Constant voltage circuit, Rh... Hot wire resistance (for detection), Th... Temperature compensation resistor, R1 to R3, R11 ~R15...Fixed resistance, Rhref...Hot wire resistance for reference voltage.
Claims (1)
に配置してなるブリツジ回路を組むと共に、該ブ
リツジ回路への供給電流を該ブリツジ回路の非平
衡電圧に基づいて制御し、吸入空気流量に応じて
前記ブリツジ回路から出力される電圧と、基準電
圧とを比較することにより吸入空気流量を検出す
るよう構成された内燃機関用熱線式流量計におて
、前記熱線抵抗と略同等の放熱特性である基準電
圧用熱線抵抗を前記熱線抵抗に近接して吸気通路
内に配設し、該基準電圧用熱線抵抗の抵抗値変化
に応じて前記基準電圧を可変設定するよう構成し
たことを特徴とする内燃機関用熱線式流量計。 A bridge circuit is constructed by arranging a hot wire resistor on one side in the intake passage of the engine, and the current supplied to the bridge circuit is controlled based on the unbalanced voltage of the bridge circuit to control the intake air flow rate. In a hot-wire flowmeter for an internal combustion engine configured to detect the intake air flow rate by comparing the voltage output from the bridge circuit with a reference voltage, the hot-wire flowmeter has heat radiation characteristics substantially equivalent to the hot-wire resistance. A reference voltage hot wire resistor is disposed in the intake passage adjacent to the hot wire resistor, and the reference voltage is variably set in accordance with a change in the resistance value of the reference voltage hot wire resistor. A hot wire flowmeter for internal combustion engines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3092989U JPH0633376Y2 (en) | 1989-03-20 | 1989-03-20 | Hot wire flow meter for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3092989U JPH0633376Y2 (en) | 1989-03-20 | 1989-03-20 | Hot wire flow meter for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02122317U true JPH02122317U (en) | 1990-10-05 |
| JPH0633376Y2 JPH0633376Y2 (en) | 1994-08-31 |
Family
ID=31256410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3092989U Expired - Lifetime JPH0633376Y2 (en) | 1989-03-20 | 1989-03-20 | Hot wire flow meter for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0633376Y2 (en) |
-
1989
- 1989-03-20 JP JP3092989U patent/JPH0633376Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0633376Y2 (en) | 1994-08-31 |
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