JP2002295292A - Device for controlling fuel injection and apparatus for measuring fluid flow - Google Patents
Device for controlling fuel injection and apparatus for measuring fluid flowInfo
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- JP2002295292A JP2002295292A JP2001101319A JP2001101319A JP2002295292A JP 2002295292 A JP2002295292 A JP 2002295292A JP 2001101319 A JP2001101319 A JP 2001101319A JP 2001101319 A JP2001101319 A JP 2001101319A JP 2002295292 A JP2002295292 A JP 2002295292A
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- Prior art keywords
- flow rate
- flow
- fluid
- output
- sub
- Prior art date
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F5/00—Measuring a proportion of the volume flow
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は燃料噴射制御装置お
よび流体流量測定装置に関し、特に内燃機関の吸気系、
例えば自動車用エンジンの吸入空気量を空気の質量とし
て直接検出可能な検出素子に、発熱抵抗体や熱線等の抵
抗温度特性を利用して測定する燃料噴射制御装置および
空気流量測定装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel injection control device and a fluid flow measurement device, and more particularly, to an intake system of an internal combustion engine,
For example, the present invention relates to a fuel injection control device and an air flow measurement device that measure a detection element capable of directly detecting an intake air amount of an automobile engine as a mass of air using resistance temperature characteristics of a heating resistor, a heating wire, and the like.
【０００２】[0002]
【従来の技術】従来、流量を測定する流量測定装置とし
て、自動車等の内燃機関（以下、「内燃機関」をエンジ
ンという）の吸気流量を測定する熱式流量計が知られて
いる。従来の熱式流量計は、吸気流量を高精度に測定す
るものであり、吸気流れ方向を検出するものではなかっ
た。2. Description of the Related Art Conventionally, as a flow rate measuring device for measuring a flow rate, a thermal flow meter for measuring an intake flow rate of an internal combustion engine (hereinafter, referred to as an "internal combustion engine") of an automobile or the like is known. The conventional thermal flow meter measures the intake flow rate with high accuracy, and does not detect the intake flow direction.
【０００３】４気筒以下のエンジンにおいて低回転且つ
高負荷のとき吸気脈動が大きくなり、吸気弁と排気弁と
の開弁期間が重なると、ピストン上昇時に吸気弁から吸
気が逆流することがある。吸気流れの順方向および逆方
向に関わらず吸気流量だけを検出する従来の熱式流量計
では、吸気が逆流したときも吸気流量として検出するの
で、燃焼室に吸入される吸気流量を正しく検出できな
い。ここで、流体流れの順方向とは本来流体が流れるべ
き方向を表し、逆方向とは順方向の逆方向を表してい
る。[0003] In an engine of four cylinders or less, intake pulsation increases when the engine speed is low and the load is high, and if the opening periods of the intake valve and the exhaust valve overlap, the intake air may flow backward from the intake valve when the piston rises. With a conventional thermal flow meter that detects only the intake flow rate regardless of the forward and reverse directions of the intake flow, it detects the intake flow even when the intake air flows backward, so the intake flow rate sucked into the combustion chamber cannot be detected correctly. . Here, the forward direction of the fluid flow indicates the direction in which the fluid should originally flow, and the reverse direction indicates the reverse direction of the forward direction.
【０００４】流れ方向を考慮して流体流量を検出するた
めに、特開２０００−１９３５０５号公報に開示されて
いる流量計に用いられる熱式流量センサは、流体温度検
出体と、発熱抵抗体と、流量検出体とを備え、発熱抵抗
体が吸気温度検出体より一定温度高い基準温度に設定さ
れており、流量検出体は、吸気流れの方向に対して発熱
抵抗体の上流側または下流側の一方にのみ配設されてい
る。In order to detect a fluid flow rate in consideration of a flow direction, a thermal type flow sensor used in a flow meter disclosed in Japanese Patent Application Laid-Open No. 2000-193505 includes a fluid temperature detector, a heating resistor, And a flow rate detector, wherein the heating resistor is set at a reference temperature that is higher than the intake temperature detector by a certain temperature, and the flow rate detector is located upstream or downstream of the heating resistor with respect to the direction of intake air flow. Only one is installed.
【０００５】上記公報に開示の発熱抵抗体は吸気流れ方
向に対し直交するように複数回折れ曲がり吸気流れ方向
に所定幅を有しているので、発熱抵抗体の吸気流れ方向
に温度分布が生じる。したがって、吸気流れにより発熱
抵抗体の上流側が冷却され上流部の温度が基準温度より
低下すると、発熱抵抗体の温度を基準温度に保持するた
めに吸気流れ下流部の温度が基準温度より上昇する。吸
気流れが逆転すると、発熱抵抗体の温度分布も逆転す
る。したがって、流量検出体の温度により吸気流量およ
び吸気流れ方向を検出することができる。The heating resistor disclosed in the above publication is bent a plurality of times so as to be orthogonal to the direction of intake air flow and has a predetermined width in the direction of intake air flow, so that a temperature distribution occurs in the direction of intake air flow of the heating resistor. Therefore, when the upstream side of the heating resistor is cooled by the intake air flow and the temperature of the upstream portion falls below the reference temperature, the temperature of the downstream portion of the intake air flow rises above the reference temperature in order to maintain the temperature of the heating resistor at the reference temperature. When the intake air flow reverses, the temperature distribution of the heating resistor also reverses. Therefore, the intake flow rate and the intake flow direction can be detected from the temperature of the flow rate detector.
【０００６】[0006]
【発明が解決しようとする課題】しかし、前記熱式流量
センサはセンサ自身の熱容量に起因する応答遅れがあ
る。また、空気流量と前記熱式流量計の出力の間には非
線形の対応関係がある。空気流量が脈動している場合こ
の応答遅れや非線形性の影響を受けた熱式流量センサの
出力をそのまま積分し平均値を求めると、真の吸気平均
値より小さい値となる。However, the thermal type flow sensor has a response delay due to the heat capacity of the sensor itself. There is a non-linear correspondence between the air flow rate and the output of the thermal flow meter. When the air flow rate is pulsating, if the output of the thermal flow sensor affected by the response delay and the nonlinearity is integrated as it is and the average value is obtained, the average value will be smaller than the true intake air average value.
【０００７】このような測定値のずれを補正するため
に、主通路である空気通路に副空気通路を設け、副空気
通路に配置した熱式流量センサにより副空気通路を流れ
る空気流量を測定し、副空気通路を流れる空気流量に基
づいて空気通路を流れる空気流量を測定する流量測定装
置が知られている。この副空気通路により補正する従来
の方法では、順方向と逆方向で補正量は基本的に同じで
あるが、前記熱式流量センサのように発熱抵抗体の上流
側に設けた流量検出体により流量を検出するものにおい
ては空気流量と熱式流量センサの出力との関係の非線形
性度合いが順方向流れと逆方向流れとで異なる。したが
って、順方向および逆方向の副空気通路による補正を両
立する事ができず、逆流を含んだ脈動流の平均値を高精
度に計測することができないことがあるという問題があ
る。In order to correct such a deviation of the measured values, a sub air passage is provided in the air passage which is the main passage, and the flow rate of air flowing through the sub air passage is measured by a thermal flow sensor disposed in the sub air passage. There is known a flow measurement device that measures an air flow rate flowing through an air passage based on an air flow rate flowing through a sub air passage. In the conventional method of correcting with the auxiliary air passage, the correction amount is basically the same in the forward direction and the reverse direction. However, the correction amount is determined by the flow rate detector provided on the upstream side of the heating resistor like the thermal type flow sensor. In the flow rate detector, the degree of nonlinearity of the relationship between the air flow rate and the output of the thermal flow rate sensor differs between the forward flow and the reverse flow. Therefore, there is a problem that the correction by the forward and backward auxiliary air passages cannot be compatible, and the average value of the pulsating flow including the backward flow cannot be measured with high accuracy.
【０００８】本発明の目的は、副空気通路を有する上記
従来の空気量測定装置における問題に鑑み、流体の順方
向流れと逆方向流れのいずれであっても、高精度に流体
の流量を検出可能な燃料噴射制御装置および流体流量測
定装置を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to accurately detect the flow rate of a fluid regardless of whether it is a forward flow or a reverse flow of the fluid, in view of the problem in the above-described conventional air flow measuring device having a sub air passage. It is an object of the present invention to provide a possible fuel injection control device and a fluid flow measuring device.
【０００９】[0009]
【課題を解決するための手段】上記課題を解決するため
に、請求項１から７のいずれかに記載の手段を採用する
ことができる。この手段によると、熱式流量センサの順
方向と逆方向で異なる脈動時誤差の差分を逆方向のテー
ブル値に補正を加えることにより逆流を含んだ脈動流の
流量平均値を高精度に計測することができる燃料噴射制
御装置が提供される。Means for Solving the Problems In order to solve the above problems, means according to any one of claims 1 to 7 can be employed. According to this means, the average of the flow rate of the pulsating flow including the backflow is measured with high accuracy by correcting the difference between the pulsation errors different in the forward direction and the reverse direction of the thermal flow sensor to the table value in the reverse direction. Is provided.
【００１０】また、上記課題を解決するために、請求項
８から１４のいずれかに記載の手段を採用することがで
きる。この手段によると、熱式流量センサの順方向と逆
方向で異なる脈動時誤差の差分を逆方向のテーブル値を
変更することにより逆流を含んだ脈動流の流量平均値を
高精度に計測することができる流体流量測定装置が提供
される。Further, in order to solve the above-mentioned problem, the means described in any one of claims 8 to 14 can be adopted. According to this means, the average of the flow rate average value of the pulsating flow including the backflow can be measured with high accuracy by changing the difference of the pulsation error different in the forward direction and the reverse direction of the thermal flow sensor by changing the table value in the reverse direction. Is provided.
【００１１】さらに、上記課題を解決するために、請求
項１５から１８のいずれかに記載の手段を採用すること
もできる。この手段によると、順方向流れと逆方向流れ
で脈動時の補正効果量が異なる副流体通路を備えること
により、逆流を含んだ脈動流の流量平均値を高精度に計
測することができる流体流量測定装置が提供される。Further, in order to solve the above-mentioned problem, a means according to any one of claims 15 to 18 can be adopted. According to this means, by providing a sub-fluid passage having a different correction effect amount at the time of pulsation between the forward flow and the backward flow, the fluid flow rate at which the average flow rate of the pulsating flow including the backward flow can be measured with high accuracy A measuring device is provided.
【００１２】[0012]
【発明の実施の形態】以下、本発明の実施の形態を図面
によって説明する。 （第１の実施の形態）図１は本発明の第１の実施の形態
による燃料噴射制御装置の構成を示すブロック図であ
る。図において、燃料噴射制御装置１０は発熱抵抗体式
空気流量計（流体流量測定装置）１１と、その空気流量
計１１の出力値である、例えば電圧値に基づいて噴射燃
料の量を制御するエンジンコントロールユニット１２
と、エンジンコントロールユニット１２により決定され
た燃料噴射量の燃料を噴射する燃料噴射弁１３とを備え
ている。Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIG. 1 is a block diagram showing a configuration of a fuel injection control device according to a first embodiment of the present invention. In the figure, a fuel injection control device 10 includes a heating resistor type air flow meter (fluid flow measurement device) 11 and an engine control for controlling the amount of injected fuel based on an output value of the air flow meter 11, for example, a voltage value. Unit 12
And a fuel injection valve 13 for injecting the fuel of the fuel injection amount determined by the engine control unit 12.
【００１３】エンジンコントロールユニット１２は、空
気流量計１１の出力電圧を空気の流量に変換する際に用
いられる空気流量変換テーブル１２１と、変換されて得
られた空気流量に基づいて噴射燃料の量を演算する噴射
燃料演算装置１２２とを備えている。流量−出力静特性
は、図示のように、順流域も逆流域も非線形であるが、
その非線形の度合いが、順方向流れと逆方向流れとで異
なっている。この非線形の度合いの相違を補償するため
に、本実施の形態では、空気流量を算出する空気流量変
換テーブル１２１を用いて空気流量計１１の出力電圧を
流体流量値に変換する場合に、テーブル値として、順方
向出力域では図に実線で示す流量−出力静特性を用い、
逆方向出力域では図に一点鎖線で示すように、流量−出
力静特性に補正を加えたものを使用している。具体的に
は、逆方向出力域（逆流）では同じ出力電圧に対して補
正後の流量の絶対値が、補正のない出力ー流量特性によ
る流量の絶対値より大きくなるように、流量−出力静特
性を補正している。The engine control unit 12 converts an output voltage of the air flow meter 11 into an air flow rate. The air flow rate conversion table 121 is used for converting the output voltage of the air flow meter 11 into an air flow rate. And an injection fuel calculating device 122 for calculating. As shown in the figure, the flow-output static characteristics are non-linear in both the forward flow region and the reverse flow region.
The degree of the nonlinearity is different between the forward flow and the backward flow. In order to compensate for the difference in the degree of nonlinearity, in the present embodiment, when the output voltage of the air flow meter 11 is converted into the fluid flow value using the air flow rate conversion table 121 for calculating the air flow rate, the table value In the forward output area, the flow rate-output static characteristic shown by the solid line in the figure is used,
In the reverse output range, as shown by the dashed line in the figure, a flow rate-output static characteristic corrected is used. Specifically, in the reverse output area (backflow), the flow-output static value is set so that the absolute value of the flow rate after the correction for the same output voltage is larger than the absolute value of the flow rate based on the output-flow rate characteristic without correction. The characteristics are corrected.
【００１４】補正を加える領域は、逆流領域に限定され
ず、順方向領域であっても、図１に一点鎖線で示すよう
に、アイドル回転時の空気流量（最低空気流量ｑ0)以下
の領域で補正を加えてもよい。図２は流量測定装置内の
熱式センサの流量−出力静特性を説明するグラフであ
る。図において、縦軸は空気通路内に配置された副空気
通路内に配設された発熱抵抗体式空気流量測定装置の中
のセンサの出力電圧であり、横軸は空気通路内に流すべ
き空気の流量を示す。上記の補正が有効である理由を図
２のグラフにより説明する。The region to be corrected is not limited to the backflow region. Even in the forward direction region, as shown by the dashed line in FIG. 1, the region below the air flow rate during idling (minimum air flow rate q 0 ). May be added. FIG. 2 is a graph illustrating the flow-output static characteristics of the thermal sensor in the flow measurement device. In the figure, the vertical axis represents the output voltage of the sensor in the heating resistor type air flow measuring device disposed in the sub air passage disposed in the air passage, and the horizontal axis represents the air flowing through the air passage. Shows the flow rate. The reason why the above correction is effective will be described with reference to the graph of FIG.
【００１５】まず、流量が０より多い順流域において空
気の脈動があると、曲線２１で示す空気流量の変化が発
生する。センサに応答遅れがない場合、曲線２２で示す
完全応答の波形でセンサが応答するはずである。そして
この場合はセンサ指示空気流量の平均値Ｍ０は実際の空
気流量の曲線２１の平均値に一致する。ところが、実際
にはセンサに応答遅れがあり、且つ、流量−出力静特性
が非線形であるので、曲線２３で示すように振幅が完全
応答の波形に比べて小さくなる。この結果、流量−出力
静特性が非線形の領域ではセンサ指示の値を流量換算し
た波形は曲線２４で示すように曲線２１に比べて振幅が
小さくなり、センサ指示空気流量の平均値Ｍ１は実際の
平均値Ｍ０より少なくなって、リーン誤差を発生する。First, if there is a pulsation of air in the forward flow region where the flow rate is greater than 0, a change in the air flow rate shown by a curve 21 occurs. If the sensor does not have a response delay, the sensor should respond with a full response waveform as shown by curve 22. In this case, the average value M0 of the sensor-indicated air flow rate matches the average value of the curve 21 of the actual air flow rate. However, since the sensor actually has a response delay and the flow rate-output static characteristic is non-linear, the amplitude is smaller than the waveform of the complete response as shown by the curve 23. As a result, in the region where the flow-output static characteristic is non-linear, the waveform obtained by converting the value of the sensor indication into the flow rate becomes smaller than the curve 21 as shown by the curve 24, and the average value M1 of the sensor-indicated air flow rate becomes the actual value. It becomes less than the average value M0, and a lean error occurs.
【００１６】一方、流量が０より少ない逆流域において
空気の脈動があると、曲線２５で示す空気流量の変化が
発生する。センサに応答遅れがない場合、曲線２６で示
す完全応答の波形でセンサが応答するはずである。そし
てこの場合はセンサ指示空気流量の平均値Ｍ２は実際の
空気流量の曲線２５の平均値に一致する。ところが、実
際にはセンサに応答遅れがあり、且つ、流量−出力静特
性が非線形であるので、曲線２７で示すように振幅が完
全応答の波形に比べて小さくなる。この結果、流量−出
力静特性が非線形の領域ではセンサ指示流量は曲線２８
で示すように曲線２５に比べて振幅が小さくなり、セン
サ指示空気流量の平均値Ｍ３は実際の平均値Ｍ２より多
くなって、リッチ誤差を発生する。On the other hand, if there is a pulsation of the air in the reverse flow region where the flow rate is less than 0, a change in the air flow rate shown by a curve 25 occurs. If the sensor does not have a response delay, the sensor should respond with a full response waveform as shown by curve 26. In this case, the average value M2 of the sensor-indicated air flow rate coincides with the average value of the actual air flow rate curve 25. However, since the sensor actually has a response delay and the flow-output static characteristic is non-linear, the amplitude becomes smaller than the waveform of the complete response as shown by the curve 27. As a result, in the region where the flow-output static characteristic is non-linear, the sensor-indicated flow becomes the curve 28.
As shown by, the amplitude becomes smaller than the curve 25, and the average value M3 of the sensor-instructed air flow rate becomes larger than the actual average value M2, and a rich error occurs.
【００１７】これらのリーン誤差及びリッチ誤差が空気
流量測定装置に副空気通路を設けることにより零になる
補正をするが、図２に示すように、空気流量とセンサ出
力電圧との関係の非線形の度合いは、順方向流れと逆方
向流れとで異なるので、同じ吸気脈動振幅に対しては逆
流域の方が流量の誤差が大きくなる。そこで本発明のこ
の実施の形態においては、図１に示したように、順方向
出力域では流量−出力静特性を用い、逆方向出力域では
流量−出力静特性に補正を加えたテーブルを使用するこ
とにした。The lean error and the rich error are corrected to be zero by providing a sub air passage in the air flow measuring device. However, as shown in FIG. 2, a non-linear relationship between the air flow and the sensor output voltage is obtained. Since the degree differs between the forward flow and the reverse flow, the error in the flow rate is larger in the reverse flow region for the same intake pulsation amplitude. Therefore, in this embodiment of the present invention, as shown in FIG. 1, a flow rate-output static characteristic is used in the forward output area, and a table obtained by correcting the flow rate-output static characteristic in the reverse output area is used. I decided to do it.
【００１８】図３は図１に示した空気流量変換テーブル
を使用した場合の流量換算誤差−エンジン回転数の関係
を示すグラフである。図示のように、本発明の上記第１
の実施の形態によれば流量換算誤差はエンジン回転数に
よらずにほぼ一定であり、従来と比較して誤差が大幅に
少なくなっている。FIG. 3 is a graph showing the relationship between the flow rate conversion error and the engine speed when the air flow rate conversion table shown in FIG. 1 is used. As shown in FIG.
According to the embodiment, the flow rate conversion error is substantially constant irrespective of the engine speed, and the error is significantly reduced as compared with the conventional case.
【００１９】図４の（Ａ）は本発明の第１の実施の形態
による空気流量計１１内の流量検出部を示す平面図、
（Ｂ）は図４の（Ａ）をｂ−ｂ線で切った断面図であ
る。図において、流量検出部４０の半導体基板４１はシ
リコン等で形成されている。流量検出体４２および発熱
抵抗体４３と対応する半導体基板４１の位置に空洞４１
ａが形成されており、空洞４１ａを含む半導体基板４１
上を絶縁膜４４が覆っている。空洞４１ａは図４の
（Ｂ）に示す半導体基板４１の下面側から絶縁膜４４と
の境界面まで異方向性エッチングにより形成されてい
る。吸気温検出体４５および４６、流量検出体４２、発
熱抵抗体４３は吸気流れの順方向に対し、上流側からこ
の順で絶縁膜４４上に形成されている。発熱抵抗体４３
はブリッジ回路により吸気温検出体４５より一定温度高
い基準温度に設定されている。吸気温検出体４５は、発
熱抵抗体４３の熱が温度検出に影響を及ぼさないように
発熱抵抗体４３から離脱した位置に配設されている。流
量検出体４２は抵抗体であり、吸気流れの順方向に対し
発熱抵抗体４３の上流側に配設されている。FIG. 4A is a plan view showing a flow detecting unit in the air flow meter 11 according to the first embodiment of the present invention.
FIG. 5B is a cross-sectional view of FIG. 4A taken along line bb. In the figure, the semiconductor substrate 41 of the flow detecting unit 40 is formed of silicon or the like. A cavity 41 is provided at the position of the semiconductor substrate 41 corresponding to the flow detector 42 and the heating resistor 43.
a is formed, and the semiconductor substrate 41 includes a cavity 41a.
An insulating film 44 covers the upper part. The cavity 41a is formed from the lower surface side of the semiconductor substrate 41 shown in FIG. The intake air temperature detectors 45 and 46, the flow detector 42, and the heating resistor 43 are formed on the insulating film 44 in this order from the upstream side in the forward direction of the intake air flow. Heating resistor 43
Is set to a reference temperature higher by a certain temperature than the intake air temperature detector 45 by a bridge circuit. The intake air temperature detector 45 is disposed at a position separated from the heating resistor 43 so that the heat of the heating resistor 43 does not affect the temperature detection. The flow rate detector 42 is a resistor, and is disposed upstream of the heating resistor 43 in the forward direction of the intake air flow.
【００２０】図４の（Ａ）に示すように、発熱抵抗体４
３は吸気流れ方向に対し直行するように複数回折れ曲が
っており、吸気流れ方向に所定幅を有している。端子４
７は吸気温検出体４５および４６、流量検出体４２およ
び発熱抵抗体４３と外部回路とを電気的に接続するため
のものである。吸気温検出体４５および４６、流量検出
体４２および発熱抵抗体４３は絶縁膜４８により覆われ
ている。As shown in FIG. 4A, the heating resistor 4
Numeral 3 is bent and bent a plurality of times so as to be perpendicular to the flow direction of the intake air, and has a predetermined width in the flow direction of the intake air. Terminal 4
Reference numeral 7 is for electrically connecting the intake air temperature detectors 45 and 46, the flow rate detector 42, and the heating resistor 43 to an external circuit. The intake air temperature detectors 45 and 46, the flow rate detector 42, and the heating resistor 43 are covered with an insulating film 48.
【００２１】図５は吸気流れ方向および吸気流量に対す
る流量検出体４２の検出温度の変化を示すグラフであ
る。流量検出体４２は吸気流れの順方向において発熱抵
抗体４３の吸気流れ上流部近傍に配置されるので、流量
検出体４２で検出する温度は発熱抵抗体４３の吸気流れ
上流部とほぼ等しい温度になる。つまり、流量検出体４
２の検出温度は、図５に示すように、吸気流れが順方向
のとき基準温度よりも低くなり、逆方向のとき基準温度
よりも高くなる。また流量検出体４２の検出温度と基準
温度との差が大きくなるほど、吸気流れ方向に関わらず
吸気流量が多いことを表している。FIG. 5 is a graph showing a change in the temperature detected by the flow rate detector 42 with respect to the flow direction and flow rate of the intake air. Since the flow rate detector 42 is disposed near the intake flow upstream of the heating resistor 43 in the forward direction of the intake flow, the temperature detected by the flow detector 42 is substantially equal to the temperature of the intake flow upstream of the heating resistor 43. Become. That is, the flow detector 4
5, the detected temperature becomes lower than the reference temperature when the intake air flow is in the forward direction, and becomes higher than the reference temperature when the intake air flow is in the reverse direction. Also, the larger the difference between the temperature detected by the flow rate detector 42 and the reference temperature, the greater the intake flow rate regardless of the intake flow direction.
【００２２】基準温度は吸気温検出体４５および４６の
検出温度、つまり吸気温度により変動するので、図５に
示す流量検出体４２の検出温度の変化を示すグラフも吸
気温により変動する。以上説明した第１の実施の形態に
おいては、空気流量計１１の出力をエンジンコントロー
ルユニット１２に入力し、エンジンコントロールユニッ
ト１２内のテーブルを補正することにより、補正された
空気流量値を得ているが、本発明はこれに限定されず、
空気流量計１１の内部に空気流量変換テーブルを備え、
その空気流量変換テーブルのテーブル値として、順方向
出力域では流量−出力静特性を用い、逆方向出力域は流
量−出力静特性に補正を加えたものを用いるようにして
もよい。 （第２の実施の形態）図６は本発明の第２の実施の形態
による発熱式空気流量測定装置の概略を示す部分断面図
である。同図において、空気流量測定装置６０は、回路
モジュール６１、流路部材６２および熱式流量センサ６
３を有する。流路部材６２は吸気管６４に設けた取付孔
６４ａに挿入され、主流路である空気流路６５に配設さ
れている。Since the reference temperature fluctuates according to the detected temperatures of the intake air temperature detectors 45 and 46, that is, the intake air temperature, the graph showing the change in the detected temperature of the flow rate detector 42 shown in FIG. In the first embodiment described above, the output of the air flow meter 11 is input to the engine control unit 12, and the corrected air flow value is obtained by correcting the table in the engine control unit 12. However, the present invention is not limited to this,
An air flow rate conversion table is provided inside the air flow meter 11,
As a table value of the air flow rate conversion table, a flow rate-output static characteristic may be used in the forward output area, and a corrected flow rate-output static characteristic may be used in the reverse output area. (Second Embodiment) FIG. 6 is a partial sectional view schematically showing a heating type air flow measuring device according to a second embodiment of the present invention. In the figure, an air flow measuring device 60 includes a circuit module 61, a flow path member 62, and a thermal flow sensor 6.
3 The flow path member 62 is inserted into a mounting hole 64a provided in the intake pipe 64, and is disposed in the air flow path 65 which is a main flow path.
【００２３】回路モジュール６１の制御回路は、流路部
材６２内に設置されている熱式流量センサ６３と電気的
に接続している。制御回路は、空気流量に応じて出力さ
れる熱式流量センサ６３の発熱抵抗体または感温抵抗体
の信号を空気流量に応じた流量信号に変換し、変換した
信号をワイヤハーネスを介しエンジンコントロールユニ
ット（ＥＣＵ）に送信する。The control circuit of the circuit module 61 is electrically connected to a thermal flow sensor 63 provided in the flow path member 62. The control circuit converts a signal of the heating resistor or the temperature-sensitive resistor of the thermal type flow sensor 63 output according to the air flow rate into a flow rate signal according to the air flow rate, and converts the converted signal into an engine control signal via the wire harness. Transmit to the unit (ECU).
【００２４】流路部材６２は、外管６６、隔壁６７およ
び仕切壁６８を有している。隔壁６７は外管６６の底部
から回路モジュール６１に向かって延びている。バイパ
ス流路（副空気通路）６９は外管６６の内壁および隔壁
６７で画成され、空気流路６５の空気流れと直交する逆
Ｕ字形状に形成されている。バイパス流路６８の流入口
６９ａおよび流出口６９ｂは空気流路６５に位置してい
る。流入口６９ａは空気流路の上流側、流出口６９ｂは
空気流路６５の下流側に向け開口している。The flow path member 62 has an outer tube 66, a partition 67, and a partition wall 68. The partition wall 67 extends from the bottom of the outer tube 66 toward the circuit module 61. The bypass passage (sub air passage) 69 is defined by the inner wall of the outer tube 66 and the partition wall 67, and is formed in an inverted U-shape orthogonal to the air flow in the air passage 65. The inflow port 69a and the outflow port 69b of the bypass flow path 68 are located in the air flow path 65. The inflow port 69a opens to the upstream side of the air flow path, and the outflow port 69b opens to the downstream side of the air flow path 65.
【００２５】バイパス流路６９は、流入口６９ａから流
入した空気が空気流路７１の一方の径方向に流れる上流
流路７０と、上流流路７０の下流側に上流流路７０と平
行に設けられ上流流路７０と反対の径方向に空気が流れ
る下流流路７１とを有している。本発明の第２の実施の
形態により、熱式センサ６３が面している支流路７０ａ
を形成する外管６６の内壁に凸曲面を有し仕切壁６８に
向けて突出した抵抗部材として凸部７４が形成されてい
る。また熱式センサ６３が面していない支流路７０ｂを
形成する外管６６の内壁に、凸曲面を有し仕切壁６８に
向けて突出した抵抗部材として凸部７４が形成されてい
る。The bypass flow path 69 is provided with an upstream flow path 70 in which air flowing from the inflow port 69a flows in one radial direction of the air flow path 71, and a downstream side of the upstream flow path 70 in parallel with the upstream flow path 70. And a downstream flow path 71 through which air flows in a radial direction opposite to the upstream flow path 70. According to the second embodiment of the present invention, the branch channel 70a facing the thermal sensor 63
The convex portion 74 is formed as a resistance member which has a convex curved surface on the inner wall of the outer tube 66 forming the outer wall 66 and protrudes toward the partition wall 68. A convex portion 74 is formed as a resistance member having a convex curved surface and protruding toward the partition wall 68 on the inner wall of the outer tube 66 that forms the branch channel 70 b not facing the thermal sensor 63.
【００２６】図７は図６における流路部材６２の一部の
断面図である。同図において、仕切壁６８は空気流路６
５の上流流路７０の空気流れに沿って延び、上流流路３
５を二つの支流路７０ａ、７０ｂに仕切っている。仕切
壁６８の支流路７０ａ側に熱式流量センサ６３が取り付
けられている。本実施の形態により、支流部７０ａを形
成している外管６６の熱式流量センサ６４が面している
内壁に空気の抵抗部として凸部７３が形成されており、
熱式流量センサ６４が面していない支流路７０ｂを形成
する外管６６の内壁に凸部７４が形成されている。凸部
７３と凸部７４は、順方向流れと逆方向流れで脈動時の
補正効果量が異なるような形状となっている。即ち、支
流路７０ｂの通路抵抗は順方法流れ時のときよりも逆方
向流れ時の方が空気抵抗が大きくなるように凸部７４が
形成されている。FIG. 7 is a sectional view of a part of the flow path member 62 in FIG. In the figure, a partition wall 68 is provided in the air passage 6.
5 along the air flow in the upstream flow path 70 and the upstream flow path 3
5 is divided into two branch channels 70a and 70b. A thermal flow sensor 63 is attached to the partition wall 68 on the side of the branch passage 70a. According to the present embodiment, the convex portion 73 is formed as an air resistance portion on the inner wall of the outer pipe 66 forming the branch portion 70a facing the thermal flow rate sensor 64,
A convex portion 74 is formed on the inner wall of the outer pipe 66 that forms the branch channel 70b that does not face the thermal flow sensor 64. The convex portion 73 and the convex portion 74 are shaped such that the correction effect amount at the time of pulsation differs between the forward flow and the reverse flow. That is, the convex portion 74 is formed so that the passage resistance of the branch passage 70b is larger in the case of the reverse flow than in the case of the forward flow.
【００２７】凸部７３は、センサ部の流れを整流し、セ
ンサ出力を安定させる効果がある。図７は順方向の空気
の流れを模式的に示しており、図８は空気の逆方向の流
れを模式的に示している。図７および図８から分かるよ
うに、凸部７４の存在により、逆方向流れは順方向流れ
よりも流れにくくなっている。また、支流路７０ａの断
面積をＳ１、支流路７０ｂの断面積をＳ２とすると、Ｓ
１＞Ｓ２となっている。これにより、抵抗部材としての
凸部７３および７４は、その抵抗部材による通路抵抗比
が異なり、さらに通路抵抗比が順方向と逆方向で異なる
ものとなっている。The projection 73 has the effect of rectifying the flow of the sensor section and stabilizing the sensor output. FIG. 7 schematically illustrates the forward flow of air, and FIG. 8 schematically illustrates the reverse flow of air. As can be seen from FIGS. 7 and 8, the presence of the convex portion 74 makes the backward flow more difficult to flow than the forward flow. If the sectional area of the branch channel 70a is S1 and the sectional area of the branch channel 70b is S2, then S
1> S2. As a result, the convex portions 73 and 74 as resistance members have different passage resistance ratios due to the resistance members, and further have different passage resistance ratios in the forward and reverse directions.
【００２８】なお、図６の構成において外管６６の内壁
に設ける凸部７４を、通路抵抗が順方向と逆方向で同じ
ものを設ける場合は前述した第１の実施の形態における
発熱抵抗体式流量測定装置に適用できる。なお、副空気
通路の断面形状は図６および図７に示したものに限定さ
れず、様々な変形が可能である。例えば、凸部７３を設
けない場合、仕切壁６８の支流路７０ｂに面する側に抵
抗部としての凸部７４と同様な形状を形成する場合等、
通路抵抗比が順方向と逆方向で異なるものであればどの
ような形状でもよい。In the configuration shown in FIG. 6, when the convex portion 74 provided on the inner wall of the outer tube 66 has the same passage resistance in the forward direction and the reverse direction, the heating resistor type flow rate in the first embodiment described above is used. Applicable to measuring devices. The sectional shape of the sub air passage is not limited to those shown in FIGS. 6 and 7, and various modifications are possible. For example, when the convex portion 73 is not provided, when a shape similar to the convex portion 74 as a resistance portion is formed on the side of the partition wall 68 facing the branch channel 70b,
Any shape may be used as long as the passage resistance ratio is different between the forward direction and the reverse direction.
【００２９】また、上記第１および第２の実施の形態で
は流体として空気を用いたが、本発明はこれに限定され
ず、任意の流体の流量検出にも適用可能である。In the first and second embodiments, air is used as the fluid. However, the present invention is not limited to this, and can be applied to detection of the flow rate of any fluid.
【図１】本発明の第１の実施の形態による燃料噴射制御
装置の構成を示すブロック図である。FIG. 1 is a block diagram illustrating a configuration of a fuel injection control device according to a first embodiment of the present invention.
【図２】流量測定装置内の熱式センサの流量−出力静特
性を説明するグラフである。FIG. 2 is a graph illustrating a flow-output static characteristic of a thermal sensor in a flow measurement device.
【図３】図１に示した空気流量変換テーブルを使用した
場合の流量換算誤差−エンジン回転数の関係を示すグラ
フである。FIG. 3 is a graph showing a relationship between a flow rate conversion error and an engine speed when the air flow rate conversion table shown in FIG. 1 is used.
【図４】Ａ）は本発明の第１の実施の形態による空気流
量計内の流量検出部を示す平面図、（Ｂ）は図４の
（Ａ）をＢ−Ｂ線で切った断面図である。FIG. 4A is a plan view showing a flow detection unit in the air flow meter according to the first embodiment of the present invention, and FIG. 4B is a cross-sectional view of FIG. 4A taken along line BB. It is.
【図５】本発明の第１の形態における吸気流れ方向およ
び吸気流量に対する流量検出体の検出温度の変化を示す
グラフである。FIG. 5 is a graph showing a change in detected temperature of a flow rate detector with respect to an intake air flow direction and an intake air flow rate according to the first embodiment of the present invention.
【図６】本発明の第２の実施の形態による発熱式空気流
量測定装置の概略を示す部分断面図である。FIG. 6 is a partial cross-sectional view schematically showing a heating type air flow measuring device according to a second embodiment of the present invention.
【図７】図６における流路部材の一部の断面図であって
空気の順方向の流れを模式的に示す図である。FIG. 7 is a cross-sectional view of a part of the flow path member in FIG. 6, schematically illustrating a forward flow of air.
【図８】図６における流路部材の一部の断面図であって
空気の逆方向の流れを模式的に示す図である。FIG. 8 is a cross-sectional view of a part of the flow path member in FIG. 6, schematically illustrating a flow of air in a reverse direction.
１０…燃料噴射制御装置 １１…発熱抵抗体式空気流量計（発熱抵抗体式流体流量
測定装置） ４２…流量検出体（流量検出抵抗体） ４３…発熱抵抗体 ６２…流体通路 ６９…バイパス流路（副空気流体通路） ７２、７３、７４…凸部 １２１…空気流量変換テーブルDESCRIPTION OF SYMBOLS 10 ... Fuel injection control apparatus 11 ... Heating resistor type air flow meter (heating resistor type fluid flow rate measuring device) 42 ... Flow rate detecting element (flow rate detecting resistor) 43 ... Heating resistor 62 ... Fluid passage 69 ... Bypass flow path (sub) (Air fluid passage) 72, 73, 74 ... convex part 121 ... air flow rate conversion table
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｇ０１Ｆ 1/684 Ｆ０２Ｄ 35/00 ３６６Ｆ 1/692 Ｇ０１Ｆ 1/68 １０１Ｂ 1/696 １０４Ａ 1/72 ２０１Ｚ Ｆターム(参考） 2F035 AA02 EA03 EA08 EA09 GA02 3G084 BA13 DA04 EA08 EB08 FA08 FA33 3G301 JA13 MA11 NB05 NC02 PA04Z PE01Z ──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) G01F 1/684 F02D 35/00 366F 1/692 G01F 1/68 101B 1/696 104A 1/72 201Z F term (Reference) 2F035 AA02 EA03 EA08 EA09 GA02 3G084 BA13 DA04 EA08 EB08 FA08 FA33 3G301 JA13 MA11 NB05 NC02 PA04Z PE01Z
Claims (18)
の曲がりを有する副流体通路と、前記副流体通路内に配
設された発熱抵抗体とを備え、流体流量および流体の流
れる方向を検出する発熱抵抗体式流体流量測定装置を含
む燃料噴射制御装置において、前記流体流量測定装置の
出力値を流体流量値に変換する場合に用いるテーブル値
として、順方向出力域では流量−出力静特性を用い、逆
方向出力域では流量−出力静特性に補正を加えたものを
用いることを特徴とする燃料噴射制御装置。An auxiliary fluid passage having at least one bend disposed in the fluid passage; and a heating resistor disposed in the sub fluid passage, and detecting a fluid flow rate and a direction in which the fluid flows. In a fuel injection control device including a heating resistor type fluid flow rate measuring device, as a table value used when converting the output value of the fluid flow rate measuring device into a fluid flow rate value, a flow rate-output static characteristic is used in a forward output range, A fuel injection control device using a flow rate-output static characteristic corrected in a reverse output range.
の曲がりを有する副流体通路と、前記副流体通路内に配
設された発熱抵抗体とを備え、流体流量および流体の流
れる方向を検出する発熱抵抗体式流体流量測定装置であ
って、センサ単体の流量−出力特性曲線の線形性が吸気
の順方向流れと逆方向流れとで異なるものを含む燃料噴
射制御装置において、前記流体流量測定装置の出力値を
流体流量値に変換する場合に用いるテーブル値として、
順方向出力域では流量−出力静特性を用い、逆方向出力
域では流量−出力静特性に補正を加えたものを用いるこ
とを特徴とする燃料噴射制御装置。2. A fuel cell system comprising: a sub-fluid passage having at least one bend disposed in the fluid passage; and a heating resistor disposed in the sub-fluid passage, and detecting a fluid flow rate and a direction in which the fluid flows. A heating resistor type fluid flow rate measuring device, wherein the linearity of the flow rate-output characteristic curve of the sensor alone is different between a forward flow and a reverse flow of intake air. As a table value used when converting an output value to a fluid flow value,
A fuel injection control device characterized by using a flow rate-output static characteristic in a forward output range and using a flow rate-output static characteristic corrected in a reverse output range.
の曲がりを有する副流体通路と、前記副流体通路内に配
設された発熱抵抗体と、前記発熱抵抗体の上流または下
流のどちらか一方にのみ流量検出抵抗体とを備え、流体
流量および流体の流れる方向を検出する発熱抵抗体式流
体流量測定装置であって、センサ単体の流量−出力特性
曲線の線形性が吸気の順方向流れと逆方向流れとで異な
るものを含む燃料噴射制御装置において、前記流体流量
装置の出力値を流体流量値に変換する場合に用いるテー
ブル値として、順方向出力域では流量−出力静特性を用
い、逆方向出力域では流量−出力静特性に補正を加えた
ものを用いることを特徴とする燃料噴射制御装置。3. A sub-fluid passage having at least one bend disposed in the fluid passage, a heating resistor disposed in the sub-fluid passage, and either one of upstream and downstream of the heating resistor. And a heating resistor type fluid flow rate measuring device for detecting the fluid flow rate and the direction of flow of the fluid, wherein the linearity of the flow rate-output characteristic curve of the sensor alone is opposite to the forward flow of the intake air. In the fuel injection control device including one different from the directional flow, as a table value used when converting the output value of the fluid flow device into a fluid flow value, a flow-output static characteristic is used in a forward output range, and a reverse direction is used. A fuel injection control apparatus characterized in that a flow rate-output static characteristic obtained by adding a correction is used in an output range.
流量−出力静特性に所定の定数を乗算したものであるこ
とを特徴とする請求項１から３のいずれか一項記載の燃
料噴射制御装置。4. The fuel injection according to claim 1, wherein the table value in the reverse output range is obtained by multiplying the flow rate-output static characteristic by a predetermined constant. Control device.
の最低流体流量以下の領域のテーブルに加えられる補正
であることを特徴とする請求項１から４のいずれか一項
記載の燃料噴射制御装置。5. The fuel injection control according to claim 1, wherein the correction is a correction that is added to a table in a region where the forward intake flow rate of the engine is equal to or less than a minimum fluid flow rate. apparatus.
に応じて変更することを特徴とする請求項１から５のい
ずれか一項記載の燃料噴射制御装置。6. The fuel injection control device according to claim 1, wherein a correction amount of the correction is changed according to an engine speed.
数出力値であることを特徴とする請求項１から６のいず
れか一項記載の燃料噴射制御装置。7. The fuel injection control device according to claim 1, wherein the output value is a voltage output value or a frequency output value.
の曲がりを有する副流体通路と、前記副流体通路内に配
設された発熱抵抗体とを備え、流体流量および流体の流
れる方向を検出する発熱抵抗体式流体流量測定装置にお
いて、前記流体流量測定装置の出力値を流体流量値に変
換する場合に用いるテーブル値として、順方向出力域で
は流量−出力静特性を用い、逆方向出力域では流量−出
力静特性に補正を加えたものを用いることを特徴とする
流体流量測定装置。8. A sub-fluid passage having at least one bend disposed in the fluid passage, and a heating resistor disposed in the sub-fluid passage, and detecting a fluid flow rate and a flowing direction of the fluid. In the heating resistor type fluid flow rate measuring device, as a table value used when converting the output value of the fluid flow rate measuring device into a fluid flow rate value, a flow rate-output static characteristic is used in a forward output range, and a flow rate is measured in a reverse direction output range. -A fluid flow measuring device characterized by using a corrected output static characteristic.
の曲がりを有する副流体通路と、前記副流体通路内に配
設された発熱抵抗体とを備え、流体流量および流体の流
れる方向を検出する発熱抵抗体式流体流量測定装置であ
って、センサ単体の流量−出力特性曲線の線形性が吸気
の順方向流れと逆方向流れとで異なるものにおいて、前
記流体流量測定装置の出力値を流体流量値に変換する場
合に用いるテーブル値として、順方向出力域では流量−
出力静特性を用い、逆方向出力域では流量−出力静特性
に補正を加えたものを用いることを特徴とする流体流量
測定装置。9. A sub-fluid passage having at least one bend disposed in the fluid passage, and a heating resistor disposed in the sub-fluid passage, and detecting a fluid flow rate and a flowing direction of the fluid. In a heating resistor type fluid flow rate measuring device, wherein the linearity of a flow rate-output characteristic curve of a sensor alone is different between a forward flow and a reverse flow of intake air, the output value of the fluid flow measuring device is a fluid flow value. The table value used when converting to
A fluid flow rate measuring apparatus characterized by using a static output characteristic, and using a flow-output static characteristic corrected in a reverse output range.
つの曲がりを有する副流体通路と、前記副流体通路内に
配設された発熱抵抗体と、前記発熱抵抗体の上流または
下流のどちらか一方にのみ流量検出抵抗体とを備え、流
体流量および流体の流れる方向を検出する発熱抵抗体式
流体流量測定装置であって、センサ単体の流量−出力特
性曲線の線形性が吸気の順方向流れと逆方向流れとで異
なるものを含むものにおいて、前記流体流量装置の出力
値を流体流量値へ変換する場合に用いるテーブル値とし
て、順方向出力域では流量−出力静特性を用い、逆方向
出力域では流量−出力静特性に補正を加えたものを用い
ることを特徴とする流体流量測定装置。10. A sub-fluid passage having at least one bend disposed in the fluid passage, a heating resistor disposed in the sub-fluid passage, and either one of upstream and downstream of the heating resistor. And a heating resistor type fluid flow rate measuring device for detecting the fluid flow rate and the direction of flow of the fluid, wherein the linearity of the flow rate-output characteristic curve of the sensor alone is opposite to the forward flow of the intake air. In the one including the one different from the directional flow, as a table value used when converting the output value of the fluid flow device to the fluid flow value, the flow rate-output static characteristic is used in the forward output area, and the reverse output area is used in the reverse output area. A fluid flow rate measuring device using a flow rate-output static characteristic corrected.
記流量−出力静特性に所定の定数を乗算したものである
ことを特徴とする請求項７から９のいずれか一項記載の
流体流量測定装置。11. The fluid flow rate according to claim 7, wherein the table value of the reverse output range is obtained by multiplying the flow rate-output static characteristic by a predetermined constant. measuring device.
量の最低流体流量以下の領域のテーブルに加えられる補
正であることを特徴とする請求項８から１１のいずれか
一項記載の流体流量測定装置。12. The fluid flow measurement according to claim 8, wherein the correction is a correction that is added to a table in a region of a minimum fluid flow of a forward intake air flow of the engine or less. apparatus.
数に応じて変更することを特徴とする請求項８から１２
のいずれか一項記載の流体流量測定装置。13. The method according to claim 8, wherein the correction amount is changed according to the engine speed.
The fluid flow measurement device according to any one of claims 1 to 4.
波数出力値であることを特徴とする請求項８から１３の
いずれか一項記載の流体流量測定装置。14. The fluid flow measurement device according to claim 8, wherein the output value is a voltage output value or a frequency output value.
つの曲がりを有する副流体通路と、前記副流体通路内に
配設された発熱抵抗体とを備え、流体流量および流体の
流れる方向を検出する発熱抵抗体式流体流量測定装置に
おいて、前記副流体通路は、順方向流れと逆方向流れで
脈動時の補正効果量が異なる副流体通路であることを特
徴とする流体流量測定装置。15. A sub-fluid passage having at least one bend disposed in the fluid passage, and a heating resistor disposed in the sub-fluid passage, and detecting a fluid flow rate and a direction in which the fluid flows. In the heating resistor type fluid flow measuring device, the sub-fluid passage is a sub-fluid passage having a different correction effect amount at the time of pulsation between a forward flow and a backward flow.
つの曲がりを有する副流体通路と、前記副流体通路内に
配設された発熱抵抗体とを備え、流体流量および流体の
流れる方向を検出する発熱抵抗体式流体流量測定装置で
あって、センサ単体の流量−出力特性曲線の線形性が吸
気流れ方向が順方向と逆方向とで異なるものにおいて、
前記副流体通路は、順方向流れと逆方向流れで脈動時の
補正効果量が異なる副流体通路であることを特徴とする
流体流量測定装置。16. A sub-fluid passage having at least one bend disposed in the fluid passage, and a heating resistor disposed in the sub-fluid passage, and detecting a fluid flow rate and a flowing direction of the fluid. In a heating resistor type fluid flow rate measuring device, the linearity of a flow rate-output characteristic curve of a sensor alone differs between a forward direction and a reverse direction in an intake flow direction,
The fluid flow measuring device, wherein the sub-fluid passage is a sub-fluid passage having a different correction effect amount at the time of pulsation between a forward flow and a reverse flow.
つの曲がりを有する副流体通路と、前記副流体通路内に
配設された発熱抵抗体と、発熱抵抗体の上流又は下流の
どちらか一方にのみ流量検出抵抗体とを備えた発熱抵抗
体式流体流量測定装置において、前記副流体通路は、順
方向流れと逆方向流れで脈動時の補正効果量が異なる副
流体通路であることを特徴とする流体流量測定装置。17. A sub-fluid passage having at least one bend disposed in the fluid passage, a heating resistor disposed in the sub-fluid passage, and one of an upstream and a downstream of the heating resistor. In the heating resistor type fluid flow rate measuring device having only the flow rate detecting resistor, the sub-fluid passage is a sub-fluid passage having a different correction effect amount at the time of pulsation between a forward flow and a reverse flow. Fluid flow measurement device.
流路に仕切る仕切り壁を有する流路部材と前記支流路の
一つに熱式流量センサを配置して、仕切り壁が仕切って
形成した二つの支流路の一方または両方の流路内壁に抵
抗部材を設け、前記抵抗部材は、その抵抗部材による通
路抵抗比が異なり、さらに通路抵抗比が順方向流れと逆
方向流れとで異なる抵抗部材であることを特徴とする請
求項１５から１７のいずれか一項記載の流体流量測定装
置。18. A flow member having a partition wall for partitioning a sub-fluid passage into a plurality of sub-flow passages in a sub-fluid passage, and a thermal flow sensor disposed in one of the sub-flow passages, and the partition wall is formed by partitioning. A resistance member is provided on one or both flow path inner walls of the two branch flow paths, and the resistance member has a different path resistance ratio due to the resistance member, and further has a different path resistance ratio between the forward flow and the reverse flow. The fluid flow measurement device according to any one of claims 15 to 17, wherein the device is a member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001101319A JP4483115B2 (en) | 2001-03-30 | 2001-03-30 | Fuel injection control device and fluid flow rate measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001101319A JP4483115B2 (en) | 2001-03-30 | 2001-03-30 | Fuel injection control device and fluid flow rate measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002295292A true JP2002295292A (en) | 2002-10-09 |
| JP4483115B2 JP4483115B2 (en) | 2010-06-16 |
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ID=18954654
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001101319A Expired - Lifetime JP4483115B2 (en) | 2001-03-30 | 2001-03-30 | Fuel injection control device and fluid flow rate measuring device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006051589A1 (en) * | 2004-11-11 | 2006-05-18 | Hitachi, Ltd. | Thermal flow rate measuring device |
| EP2282039A2 (en) | 2009-07-01 | 2011-02-09 | Hitachi Automotive Systems, Ltd. | Internal combustion engine control apparatus |
| JP2011106925A (en) * | 2009-11-16 | 2011-06-02 | Hitachi Automotive Systems Ltd | Gas flow measuring instrument of internal combustion engine |
| EP3130788A4 (en) * | 2014-04-11 | 2017-04-19 | Nissan Motor Co., Ltd | Apparatus and method for controlling internal combustion engine |
| JP2019100182A (en) * | 2017-11-28 | 2019-06-24 | トヨタ自動車株式会社 | Intake air volume measurement device |
| JP2019109190A (en) * | 2017-12-20 | 2019-07-04 | 三菱電機株式会社 | Flow rate detector |
| WO2020008786A1 (en) * | 2018-07-02 | 2020-01-09 | 日立オートモティブシステムズ株式会社 | Thermal flow rate measurement device |
-
2001
- 2001-03-30 JP JP2001101319A patent/JP4483115B2/en not_active Expired - Lifetime
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006051589A1 (en) * | 2004-11-11 | 2006-05-18 | Hitachi, Ltd. | Thermal flow rate measuring device |
| JPWO2006051589A1 (en) * | 2004-11-11 | 2008-05-29 | 株式会社日立製作所 | Thermal flow meter |
| US7613582B2 (en) | 2004-11-11 | 2009-11-03 | Hitachi, Ltd. | Thermal type flow rate measurement apparatus |
| JP4602973B2 (en) * | 2004-11-11 | 2010-12-22 | 日立オートモティブシステムズ株式会社 | Thermal flow meter |
| US8340926B2 (en) | 2009-07-01 | 2012-12-25 | Hitachi Automotive Systems, Ltd. | Internal combustion engine control apparatus |
| EP2282039A2 (en) | 2009-07-01 | 2011-02-09 | Hitachi Automotive Systems, Ltd. | Internal combustion engine control apparatus |
| JP2011106925A (en) * | 2009-11-16 | 2011-06-02 | Hitachi Automotive Systems Ltd | Gas flow measuring instrument of internal combustion engine |
| EP3130788A4 (en) * | 2014-04-11 | 2017-04-19 | Nissan Motor Co., Ltd | Apparatus and method for controlling internal combustion engine |
| JP2019100182A (en) * | 2017-11-28 | 2019-06-24 | トヨタ自動車株式会社 | Intake air volume measurement device |
| US11085392B2 (en) | 2017-11-28 | 2021-08-10 | Toyota Jidosha Kabushiki Kaisha | Intake air amount measuring device and method |
| JP2019109190A (en) * | 2017-12-20 | 2019-07-04 | 三菱電機株式会社 | Flow rate detector |
| WO2020008786A1 (en) * | 2018-07-02 | 2020-01-09 | 日立オートモティブシステムズ株式会社 | Thermal flow rate measurement device |
| JPWO2020008786A1 (en) * | 2018-07-02 | 2021-05-20 | 日立Astemo株式会社 | Thermal flow measuring device |
| JP7034285B2 (en) | 2018-07-02 | 2022-03-11 | 日立Astemo株式会社 | Thermal flow measuring device |
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