JPH02144635U - - Google Patents
Info
- Publication number
- JPH02144635U JPH02144635U JP5345489U JP5345489U JPH02144635U JP H02144635 U JPH02144635 U JP H02144635U JP 5345489 U JP5345489 U JP 5345489U JP 5345489 U JP5345489 U JP 5345489U JP H02144635 U JPH02144635 U JP H02144635U
- Authority
- JP
- Japan
- Prior art keywords
- differential pressure
- detector
- air flow
- value
- measuring device
- 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 5
- 238000002485 combustion reaction Methods 0.000 claims 1
- 230000035945 sensitivity Effects 0.000 claims 1
- 238000011144 upstream manufacturing Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 1
Landscapes
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Measuring Volume Flow (AREA)
Description
第１図はこの考案による空気流量測定装置の一
実施例を示す説明図、第２図は第１図の空気流量
測定装置における各検出器による出力特性を示す
グラフ、第３図はこの考案による空気流量測定装
置の作動を説明するための処理フロー図、第４図
は差圧検出器の一例を示す回路図、第５図は従来
の空気流量測定装置を示す説明図、及び第６図は
空気流量測定装置の差圧と流量との関係を示すグ
ラフである。
４……スロツトルバルブ、５…スロツトル開度
検出器、６……第１検出器、７……第２検出器、
８……絶対圧検出器、９……温度検出器、１０…
…信号処理回路、１６……受圧部歪計、１７，１
８……出力端子、２１，２２……増幅器、ΔＰ…
…差圧、ΔＰＡ，ΔＰＢ……アナログ量、ΔＰＡ
Ｄ，ΔＰＢＤ……デイジタル量、ΔＰｔｈ……測
定可能限界差圧値、θ……スロツトル開度。
Fig. 1 is an explanatory diagram showing an embodiment of the air flow rate measuring device according to this invention, Fig. 2 is a graph showing the output characteristics of each detector in the air flow rate measuring device of Fig. 1, and Fig. 3 is according to this invention. 4 is a circuit diagram showing an example of a differential pressure detector, FIG. 5 is an explanatory diagram showing a conventional air flow rate measuring device, and FIG. 6 is a process flow diagram for explaining the operation of the air flow rate measuring device. It is a graph showing the relationship between differential pressure and flow rate of an air flow rate measuring device. 4... Throttle valve, 5... Throttle opening detector, 6... First detector, 7... Second detector,
8...Absolute pressure detector, 9...Temperature detector, 10...
... Signal processing circuit, 16 ... Pressure receiver strain meter, 17, 1
8...Output terminal, 21, 22...Amplifier, ΔP...
...Differential pressure, ΔPA, ΔPB...Analog amount, ΔPA
D, ΔPBD...digital quantity, ΔPth ...measurable limit differential pressure value, θ...throttle opening degree.
Claims (1)
空気流との差圧により吸入空気流量を求める内燃
機関の空気流量測定装置において、前記差圧を検
出する第１検出器及び該第１検出器より検出感度
が良く且つ差圧の測定可能な限界範囲を有する第
２検出器と、前記第１検出器の差圧検出値が前記
第２検出器の測定可能限界差圧値より大きい時に
は前記第１検出器の差圧検出値を且つ小さい時に
は前記第２検出器の差圧検出値を差圧出力信号と
して採用する比較演算手段と、を有する空気流量
測定装置。 (2) 前記各検出器は一つの差圧検出部に複数の
異なつた出力をする増幅器を組み合わせて構成し
た請求項１に記載の空気流量測定装置。[Claims for Utility Model Registration] (1) In an air flow rate measuring device for an internal combustion engine that determines the intake air flow rate based on the differential pressure between the air flow upstream and the downstream air flow of a throttle valve, a second detector which has better detection sensitivity than the first detector and has a measurable limit range of differential pressure; and a differential pressure detected value of the first detector can be measured by the second detector. an air flow rate measuring device comprising: comparison calculation means for employing the differential pressure detection value of the first detector as a differential pressure output signal when the differential pressure value is greater than the limit differential pressure value, and the differential pressure detection value of the second detector when the differential pressure detection value is smaller than the differential pressure limit value; . (2) The air flow measuring device according to claim 1, wherein each of the detectors is constructed by combining a single differential pressure detection section with a plurality of amplifiers that output different outputs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5345489U JPH02144635U (en) | 1989-05-11 | 1989-05-11 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5345489U JPH02144635U (en) | 1989-05-11 | 1989-05-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02144635U true JPH02144635U (en) | 1990-12-07 |
Family
ID=31574651
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5345489U Pending JPH02144635U (en) | 1989-05-11 | 1989-05-11 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02144635U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004079305A1 (en) * | 2003-03-03 | 2004-09-16 | Noritaka Matsuo | Engine suction air flow rate measuring device |
| WO2005005812A1 (en) * | 2003-07-10 | 2005-01-20 | Toyota Jidosha Kabushiki Kaisha | Suction air amount predicting device of internal combustion engine |
| JP2012036755A (en) * | 2010-08-04 | 2012-02-23 | Noritaka Matsuo | Engine intake air flow measuring device of engine |
-
1989
- 1989-05-11 JP JP5345489U patent/JPH02144635U/ja active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004079305A1 (en) * | 2003-03-03 | 2004-09-16 | Noritaka Matsuo | Engine suction air flow rate measuring device |
| JPWO2004079305A1 (en) * | 2003-03-03 | 2006-08-10 | 典孝 松尾 | Engine intake air flow rate measuring device |
| JP4565065B2 (en) * | 2003-03-03 | 2010-10-20 | 典孝 松尾 | Engine intake air flow rate measuring device |
| WO2005005812A1 (en) * | 2003-07-10 | 2005-01-20 | Toyota Jidosha Kabushiki Kaisha | Suction air amount predicting device of internal combustion engine |
| US7085643B2 (en) | 2003-07-10 | 2006-08-01 | Toyota Jidosha Kabushiki Kaisha | Device for estimating an amount of intake air of an internal combustion engine |
| JP2008151145A (en) * | 2003-07-10 | 2008-07-03 | Toyota Motor Corp | Suction air quantity predicting device for internal combustion engine |
| JP4577380B2 (en) * | 2003-07-10 | 2010-11-10 | トヨタ自動車株式会社 | Intake air amount estimation device for internal combustion engine |
| JP2012036755A (en) * | 2010-08-04 | 2012-02-23 | Noritaka Matsuo | Engine intake air flow measuring device of engine |
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