JPH0462015B2 - - Google Patents
Info
- Publication number
- JPH0462015B2 JPH0462015B2 JP58201262A JP20126283A JPH0462015B2 JP H0462015 B2 JPH0462015 B2 JP H0462015B2 JP 58201262 A JP58201262 A JP 58201262A JP 20126283 A JP20126283 A JP 20126283A JP H0462015 B2 JPH0462015 B2 JP H0462015B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- throttle valve
- detection
- detection element
- combustion engine
- 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.)
- Expired - Lifetime
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
- G01L23/24—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid specially adapted for measuring pressure in inlet or exhaust ducts of internal-combustion engines
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/0007—Fluidic connecting means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Measuring Fluid Pressure (AREA)
Description
【発明の詳細な説明】
本発明は、内燃機関のシリンダに吸入される直
前の空気（以下、燃焼用空気という）の圧力を検
出する方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for detecting the pressure of air (hereinafter referred to as combustion air) just before being sucked into a cylinder of an internal combustion engine.
背景技術 典型的な先行技術は、第１図に示されている。Background technology A typical prior art is shown in FIG.
内燃機関１には、燃焼用空気がエアクリーナ２
からスロツトルバルブ３およびサージタンク４を
介してインテツクマニホールド５から各気筒ごと
に供給される。内燃機関１からの排気ガスは、排
気マニホールド６から排気管７に排出される。各
気筒ごとに設けられた燃料噴射弁８は、制御回路
９によつて開閉制御される。この燃料噴射弁８の
開弁時間、つまり燃料供給量は、圧力検出素子１
０からの出力に依存する。 Combustion air is supplied to the internal combustion engine 1 through an air cleaner 2.
It is supplied to each cylinder from an intake manifold 5 via a throttle valve 3 and a surge tank 4. Exhaust gas from the internal combustion engine 1 is discharged from an exhaust manifold 6 to an exhaust pipe 7. The fuel injection valve 8 provided for each cylinder is controlled to open and close by a control circuit 9. The opening time of the fuel injection valve 8, that is, the amount of fuel supplied, is determined by the pressure detection element 1.
Depends on the output from 0.
サージタンク４の壁部には、第２図に示される
ように管継手１１を介して管１２が接続される。
この管１２は、圧力検出素子１０に連結され、管
１２したがつてサージタンク４内の圧力が検出さ
れる。この圧力検出素子１０は、サージタンク４
の壁面付近の静圧を検出する。したがつてスロツ
トル弁３を急変した場合、流入する燃焼用空気の
流量は大きく変化し、このとき圧力検出素子１０
によつて検出される出力は、無視することができ
ない時間遅れを生じた。 A pipe 12 is connected to the wall of the surge tank 4 via a pipe joint 11, as shown in FIG.
This pipe 12 is connected to a pressure detection element 10, and the pressure inside the surge tank 4 is therefore detected. This pressure detection element 10 is connected to the surge tank 4
Detects the static pressure near the wall of the Therefore, when the throttle valve 3 is suddenly changed, the flow rate of the inflowing combustion air changes greatly, and at this time, the pressure detection element 10
The output detected by has a non-negligible time delay.
第３図１に示されるように、時刻t1から時刻t2
に至るまでスロツトル弁３を全閉から全開状態に
急変させたときと想定する。このときにおける圧
力検出素子１０からの出力信号の波形は、第３図
２に示されている。時刻t1においてスロツトル弁
３を急速に開いたとき、スロツトル弁３を介して
流れ込んだ空気は、それまで密度の低かつたサー
ジタンク４内に拡散していくと同時に、高速度の
空気流のまま吸気マニホールド５側に流れ込む。
したがつてサージタンク４の壁面の圧力が上昇す
るには、スロツトル弁３が開かれた時刻t1からか
なりの遅れ時間W1を経た時刻t3となる。この遅
れ時間W1は、たとえば60〜70msec程度である。 As shown in FIG. 3, from time t1 to time t2
It is assumed that the throttle valve 3 is suddenly changed from fully closed to fully open. The waveform of the output signal from the pressure detection element 10 at this time is shown in FIG. 32. When the throttle valve 3 is rapidly opened at time t1, the air flowing through the throttle valve 3 diffuses into the surge tank 4, which had a low density until then, and at the same time remains a high-velocity air flow. It flows into the intake manifold 5 side.
Therefore, the pressure on the wall surface of the surge tank 4 does not rise until time t3, after a considerable delay time W1 from time t1 when the throttle valve 3 is opened. This delay time W1 is, for example, about 60 to 70 msec.
目 的
本発明の目的は、スロツトル弁３の開度の変化
による吸気状態の変化を良好な応答性で検出する
ことができる方法を提供することである。Purpose An object of the present invention is to provide a method that can detect changes in intake conditions due to changes in the opening degree of the throttle valve 3 with good responsiveness.
発明の構成
本発明は、内燃機関の吸入空気の圧力を検出す
る方法において、吸気管壁近傍までその両端が開
設された開口部を有し、該開口部をこの吸入空気
の流れの上流に向けた検出部を、スロツトル弁の
下流側で該スツトル弁の近傍において、円筒状に
形成された吸気管の直径線上に、かつ前記スロツ
トル弁の回転軸に対して交差するように設け、こ
の検出部で前記吸入空気の動圧成分の一部、ある
いは全部を静圧に変換し、この検出部の圧力を圧
力検出素子によつて検出することを特徴とする内
燃機関の吸入空気圧力検出方法である。Structure of the Invention The present invention provides a method for detecting the pressure of intake air of an internal combustion engine, which includes an opening with both ends opened near the intake pipe wall, and the opening is directed upstream of the flow of the intake air. A detection section is provided on the downstream side of the throttle valve in the vicinity of the throttle valve, on the diameter line of the cylindrical intake pipe and intersecting the rotation axis of the throttle valve. A method for detecting intake air pressure in an internal combustion engine, characterized in that part or all of the dynamic pressure component of the intake air is converted into static pressure, and the pressure of this detection section is detected by a pressure detection element. .
実施例
第４図は、本発明の一実施例のブロツク図であ
る。内燃機関１の燃焼用空気は、エアクリーナ２
からスロツトル弁３によつて流量制御され、管路
１３からサージタンク４および吸気マニホールド
５を介して各気筒ごとに供給される。各気筒ごと
には、燃料噴射弁８が設けられており、その開弁
時間は制御回路９によつて制御される。内燃機関
１からの排ガスは、排気マニホールド６から管路
７を介して放出される。制御回路９にはまた、イ
グナイタ１４が接続されている。排気ガスの酸素
濃度は、酸素検出素子１５によつて検出される。
本発明に従えば、管路１３における燃焼用空気の
吸気状態が圧力検出素子１６によつて検出され
る。Embodiment FIG. 4 is a block diagram of an embodiment of the present invention. Combustion air for the internal combustion engine 1 is supplied to the air cleaner 2.
The flow rate is controlled by the throttle valve 3, and the air is supplied to each cylinder from the conduit 13 via the surge tank 4 and the intake manifold 5. A fuel injection valve 8 is provided for each cylinder, and its opening time is controlled by a control circuit 9. Exhaust gas from the internal combustion engine 1 is discharged from an exhaust manifold 6 via a conduit 7. An igniter 14 is also connected to the control circuit 9. The oxygen concentration of the exhaust gas is detected by the oxygen detection element 15.
According to the present invention, the intake state of combustion air in the pipe line 13 is detected by the pressure detection element 16.
第５図は、第４図に示された実施例の電気的構
成を示すブロツク図である。酸素検出素子１５、
圧力検出素子１６および内燃機関パラメータを検
出する検出素子１７からの信号は、制御回路９に
含まれているインタフエイス１９からマイクロプ
ロセツサ２０に与えられる。マイクロプロセツサ
２０には、リードオンリメモリ２１およびランダ
ムアクセスメモリ２２が接続されており、予め定
めたプログラム動作を行なう。マイクロプロセツ
サ２０からの出力は、インタフエイス２３からラ
イン２４を介して燃料噴射弁８に与えられるとと
もに、ライン２５を介してイグナイタ１４に与え
られる。検出素子１７は、たとえば内燃機関１の
クランク軸の回転数を検出し、あるいは冷却水の
温度を検出し、あるいはまたその他の検出を行な
う機能を有してもよい。制御回路９は、このよう
な各種の検出素子１５，１６，１７からの出力に
基づいて、燃料噴射弁８の開弁時刻および閉弁時
間ならびにイグナイタ１４による点火時期などを
制御する。 FIG. 5 is a block diagram showing the electrical configuration of the embodiment shown in FIG. 4. oxygen detection element 15,
Signals from the pressure detection element 16 and the detection element 17 for detecting internal combustion engine parameters are provided to the microprocessor 20 from an interface 19 included in the control circuit 9. A read-only memory 21 and a random access memory 22 are connected to the microprocessor 20, and performs predetermined program operations. The output from the microprocessor 20 is applied from the interface 23 to the fuel injection valve 8 via a line 24 and to the igniter 14 via a line 25. The detection element 17 may have the function of detecting, for example, the rotational speed of the crankshaft of the internal combustion engine 1, the temperature of the cooling water, or other detection functions. The control circuit 9 controls the opening time and closing time of the fuel injection valve 8, the ignition timing of the igniter 14, etc. based on the outputs from the various detection elements 15, 16, and 17.
第６図は管路１３付近の断面図である。管路１
３には検出管２７が内挿されており、その検出管
２７は第７図に示されている。 FIG. 6 is a sectional view of the vicinity of the conduit 13. Conduit 1
3 has a detection tube 27 inserted therein, and the detection tube 27 is shown in FIG.
第８図は第６図の切断面線−から見た断面
図であり、第９図は検出管２７付近の平面図であ
る。管路１３は、直円筒状に形成されており、検
出管２７は第１０図で明らかに示されるように、
スロツトル弁３の回転軸３ａと交差、好ましくは
垂直に交差する管路１３の一直径線上に軸線を有
する。この検出管２７には、燃焼用空気の流れの
上流側、すなわちスロツトル弁３側（第６図およ
び第７図の左方）に開口した検出孔２８を有す
る。検出孔２８は、管路１３の管軸に関して線対
称に形成される。検出管２７は、管路２９を介し
て圧力検出素子１６に連結される。 8 is a sectional view taken along the cutting plane line - in FIG. 6, and FIG. 9 is a plan view of the vicinity of the detection tube 27. The conduit 13 is formed into a right cylindrical shape, and the detection tube 27 is clearly shown in FIG.
It has an axis on one diameter line of the pipe line 13 that intersects, preferably perpendicularly, the rotation axis 3a of the throttle valve 3. This detection tube 27 has a detection hole 28 that opens on the upstream side of the flow of combustion air, that is, on the throttle valve 3 side (left side in FIGS. 6 and 7). The detection hole 28 is formed symmetrically with respect to the pipe axis of the pipe line 13. The detection tube 27 is connected to the pressure detection element 16 via a conduit 29.
第１０図は第６図の切断面線Ｘ−Ｘから見た簡
略化した断面図である。スロツトル弁３を部分的
にあるいは全開した状態では、燃焼用空気は参照
符３０で示されるように流れる。その燃焼用空気
の流れの一部は、検出孔２８から、検出管２７の
検出孔２８の反対側の部分３１に衝突する。これ
により動圧も変換され、更に検出管２７の圧力
は、圧力検出素子１６によつて検出される。 FIG. 10 is a simplified cross-sectional view taken along the section line XX in FIG. 6. When the throttle valve 3 is partially or fully open, combustion air flows as indicated by the reference numeral 30. A portion of the combustion air flow impinges from the detection hole 28 on a portion 31 of the detection tube 27 on the opposite side of the detection hole 28 . As a result, the dynamic pressure is also converted, and the pressure in the detection tube 27 is further detected by the pressure detection element 16.
スロツトル弁３を全閉状態から全開状態に第１
１図１の時刻t1〜t2に亘つて変化させたとき、圧
力検出素子１６から得られる信号波形は第１１図
２で示される。スロツトル弁３を開き始めた時刻
t1から短い遅れ時間W2を時刻t4において圧力検
出素子１６からの大きな信号レベルが得られる。
遅れ時間W2は、例えば30〜40msecである。比較
のために前述の第３図２で示された先行技術にお
ける圧力検出素子１０から得られる信号波形ｌ１
は大きな遅れ時間W1を有する。本発明によれば、
この遅れ時間W1からW2に短縮されることにな
る。従つてスロツトル弁３を急に開いた場合、圧
力検出素子１６からの信号レベルが早く増大する
ことによつて、制御回路９はすみやかに燃料噴射
弁８の開弁時間を長くし、これによつて燃料噴射
量を多くする。 The first step is to change the throttle valve 3 from the fully closed state to the fully open state.
1. The signal waveform obtained from the pressure detection element 16 when the pressure is changed over time t1 to t2 in FIG. 1 is shown in FIG. Time when throttle valve 3 started opening
A large signal level is obtained from the pressure detection element 16 at time t4 after a short delay time W2 from t1.
The delay time W2 is, for example, 30 to 40 msec. For comparison, the signal waveform l1 obtained from the pressure sensing element 10 in the prior art shown in FIG.
has a large delay time W1. According to the invention,
This delay time W1 is reduced to W2. Therefore, when the throttle valve 3 is suddenly opened, the signal level from the pressure detection element 16 increases quickly, so the control circuit 9 promptly increases the opening time of the fuel injection valve 8, thereby increasing the valve opening time of the fuel injection valve 8. Therefore, increase the amount of fuel injection.
圧力検出素子１６によつて検出される圧力は、
管路１３を流れる燃焼用空気の動圧成分が含まれ
ている。したがつて圧力検出素子１６によつて検
出される圧力と必要な燃料噴射量との間には、完
全なリニアな関係は成立しない。マイクロプロセ
ツサ２０では、このような検出圧力に対応した必
要燃料噴射量を演算によつて容易に算出すること
ができる。 The pressure detected by the pressure detection element 16 is
The dynamic pressure component of the combustion air flowing through the pipe 13 is included. Therefore, a perfectly linear relationship does not hold between the pressure detected by the pressure detection element 16 and the required fuel injection amount. The microprocessor 20 can easily calculate the required fuel injection amount corresponding to such detected pressure by calculation.
検出管２７は、スロツトル弁３とサージタンク
４とを接続する管路１３のいずれの位置に設けら
れていてもよい。 The detection tube 27 may be provided at any position in the conduit 13 that connects the throttle valve 3 and the surge tank 4.
以上のように本発明によれば、燃焼用空気の流
れの上流に開口した検出管を燃焼用空気の通路の
流動する位置に設け、流れの動圧成分も検出した
ので、スロツトル弁の開度の変化に追随して良好
な応答速度で吸気状態を検出することが可能にな
る。また、燃焼用空気の変化が最も早く起こるス
ロツトル弁の直後に検出管２７を設ければ応答性
もよく、流れが安定しているため、検出圧力に含
まれる動圧成分も安定したものとなつている。 As described above, according to the present invention, the detection tube opened upstream of the flow of combustion air is provided at the position where the combustion air flows, and the dynamic pressure component of the flow is also detected. It becomes possible to detect the intake state with a good response speed by following the changes in the intake air. In addition, if the detection tube 27 is installed immediately after the throttle valve where the combustion air changes most quickly, the response will be good and the flow will be stable, so the dynamic pressure component included in the detected pressure will also be stable. ing.
さらにまた、検出管２７をスロツトル弁３の回
転軸３ａと交差するように配置するので、スロツ
トル弁３の低開度域において、スロツトル弁３の
先端部３ｂと管路１３の内周面との〓間から流込
み、管壁付近を通過する燃焼用空気も、検出孔２
８に衝突し易く、確実に補捉することができ、前
記低開度域における検出精度を向上することがで
きる。 Furthermore, since the detection tube 27 is arranged so as to intersect with the rotation axis 3a of the throttle valve 3, the tip end 3b of the throttle valve 3 and the inner circumferential surface of the conduit 13 are in contact with each other in the low opening range of the throttle valve 3. 〓Combustion air that flows in from the gap and passes near the pipe wall also flows through the detection hole 2.
8, which can be reliably captured, and the detection accuracy in the low opening range can be improved.
第１図は先行技術の系統図、第２図は第１図の
セクシヨンの拡大断面図、第３図は第１図およ
び第２図に示された先行技術の特性を示すグラ
フ、第４図は本発明の一実施例の系統図、第５図
は第４図に示された実施例の電気的構成を示すブ
ロツク図、第６図は管路１３付近の断面図、第７
図は検出管２７の斜視図、第８図は第６図の切断
面線−から見た断面図、第９図は検出管２７
付近の水平断面図、第１０図は第６図の切断面線
Ｘ−Ｘから見た断面図、第１１図は上述の実施例
の特性を示すグラフである。
１……内燃機関、３……スロツトル弁、４……
サージタンク、５………吸気マニホールド、６…
…排気マニホールド、８……燃料噴射弁、９……
制御回路、１６……圧力検出素子、２７……検出
管、２８，３２，３４……検出孔。
Figure 1 is a systematic diagram of the prior art, Figure 2 is an enlarged sectional view of the section in Figure 1, Figure 3 is a graph showing the characteristics of the prior art shown in Figures 1 and 2, and Figure 4. is a system diagram of an embodiment of the present invention, FIG. 5 is a block diagram showing the electrical configuration of the embodiment shown in FIG. 4, FIG.
The figure is a perspective view of the detection tube 27, FIG. 8 is a sectional view taken from the cutting plane line - in FIG. 6, and FIG.
A horizontal sectional view of the vicinity, FIG. 10 is a sectional view taken along the section line XX in FIG. 6, and FIG. 11 is a graph showing the characteristics of the above-mentioned embodiment. 1... Internal combustion engine, 3... Throttle valve, 4...
Surge tank, 5...Intake manifold, 6...
...Exhaust manifold, 8...Fuel injection valve, 9...
Control circuit, 16...pressure detection element, 27...detection tube, 28, 32, 34...detection hole.
Claims (1)
おいて、吸気管壁近傍までその両端が開設された
開口部を有し、該開口部をこの吸入空気の流れの
上流に向けた検出部を、スロツトル弁の下流側で
該スロツトル弁の近傍において、円筒状に形成さ
れた吸気管の直径線上に、かつ前記スロツトル弁
の回転軸に対して交差するように設け、この検出
部で前記吸入空気の動圧成分の一部、あるいは全
部を静圧に変換し、この検出部の圧力を圧力検出
素子によつて検出することを特徴とする内燃機関
の吸入空気圧力検出方法。1. In a method for detecting the pressure of intake air of an internal combustion engine, a detection part having an opening at both ends extending to the vicinity of the intake pipe wall, and with the opening facing upstream of the flow of intake air, is connected to a throttle valve. The detector is provided near the throttle valve on the downstream side of the valve, on the diameter line of the cylindrical intake pipe and intersecting the rotational axis of the throttle valve. 1. A method for detecting intake air pressure in an internal combustion engine, characterized in that part or all of a pressure component is converted into static pressure, and the pressure in a detection section is detected by a pressure detection element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20126283A JPS6093328A (en) | 1983-10-26 | 1983-10-26 | Detection for pressure of intake air in internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20126283A JPS6093328A (en) | 1983-10-26 | 1983-10-26 | Detection for pressure of intake air in internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6093328A JPS6093328A (en) | 1985-05-25 |
| JPH0462015B2 true JPH0462015B2 (en) | 1992-10-02 |
Family
ID=16438025
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20126283A Granted JPS6093328A (en) | 1983-10-26 | 1983-10-26 | Detection for pressure of intake air in internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6093328A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19517676B4 (en) | 1995-05-13 | 2008-01-31 | Robert Bosch Gmbh | Pressure sensor for an internal combustion engine with an intake pipe |
| US6604424B1 (en) | 1999-06-16 | 2003-08-12 | Denso Corporation | Pressure detecting apparatus and installation structure of same |
| JP4792427B2 (en) | 2007-06-15 | 2011-10-12 | トヨタ自動車株式会社 | Piping waterproof connection structure |
| JP5557767B2 (en) * | 2011-02-09 | 2014-07-23 | 日立オートモティブシステムズ株式会社 | Sensor structure |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5936224B2 (en) * | 1977-10-20 | 1984-09-03 | ヤマハ発動機株式会社 | Engine exhaust pressure detector |
| JPS5726624U (en) * | 1980-07-21 | 1982-02-12 |
-
1983
- 1983-10-26 JP JP20126283A patent/JPS6093328A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6093328A (en) | 1985-05-25 |
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