JPH07260534A - Air flow measuring device - Google Patents

Air flow measuring device

Info

Publication number
JPH07260534A
JPH07260534A JP4677294A JP4677294A JPH07260534A JP H07260534 A JPH07260534 A JP H07260534A JP 4677294 A JP4677294 A JP 4677294A JP 4677294 A JP4677294 A JP 4677294A JP H07260534 A JPH07260534 A JP H07260534A
Authority
JP
Japan
Prior art keywords
intake
signal
air flow
pressure
temperature
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
Application number
JP4677294A
Other languages
Japanese (ja)
Inventor
Tadao Suzuki
忠雄 鈴木
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP4677294A priority Critical patent/JPH07260534A/en
Publication of JPH07260534A publication Critical patent/JPH07260534A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To reduce various influences caused by intake pipe structure, engine contraflow and pressure-temperature change by providing means for respectively detecting intake air temperature and intake air pressure in an intake pipe, in the same device. CONSTITUTION:A pressure signal P from a pressure sensor, and a temperature signal T from an intake air temperature sensor are respectively outputted through a connector. The signals P, T are supplied to an arithmetic circuit to compute air density rho and outputted through the connector. The signal P, signal T and density rho from an air flow measuring device are respectively inputted to a control unit 10, and the position signals of the top dead center-(TDC) and bottom dead center(BDC) of a piston 14 in a cylinder 13 are also inputted to the unit 10 from each cylinder. The mass air flow cylinder by cylinder is computed from these input signals, and the opening time Tp of an injector 12 is set in such a way as to obtain an optimum air-fuel ratio to the mass air flow.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、内燃機関に供給される
吸入空気流量を検出する空気流量測定装置に関し、特
に、空気密度を検出して各エンジン気筒容量から質量流
量を計測できる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 an air flow rate measuring device for detecting a flow rate of intake air supplied to an internal combustion engine, and more particularly to an air flow rate measuring device capable of measuring a mass flow rate from each engine cylinder capacity by detecting an air density. Regarding the device.

【0002】[0002]

【従来の技術】特願平4−8993 号公報に記載のように、
発熱抵抗体式エアフローセンサと圧力センサを一体化し
た空気流量測定装置はある。内燃機関に供給される吸入
空気流量は、吸気管内の一部に設置した発熱抵抗体によ
り検出し、併設した圧力センサは、前記発熱抵抗体の汚
損劣化に対する自己診断に使用する空気流量測定装置が
ある。
2. Description of the Related Art As described in Japanese Patent Application No. 4-8993,
There is an air flow rate measuring device that integrates a heating resistor type air flow sensor and a pressure sensor. The intake air flow rate supplied to the internal combustion engine is detected by a heating resistor installed in a part of the intake pipe, and the attached pressure sensor is an air flow rate measuring device used for self-diagnosis against stain deterioration of the heating resistor. is there.

【0003】[0003]

【発明が解決しようとする課題】前記した従来技術で
は、まず、発熱抵抗体が吸気管内の一部の流速により内
燃機関に供給される吸入空気流量を決定しているため、
発熱抵抗体上流側の吸気管構造により出力誤差を生じる
こと。更に、発熱抵抗体は、正,逆流検出が不可能であ
りエンジン逆流の影響を受け出力誤差を生じるという課
題があった。また、高地での外気圧力変化,温度変化に
対しても出力誤差を生じる課題があった。併設した圧力
センサは、前記発熱抵抗体の汚損劣化に対する自己診断
に使用するため、前記した課題に対し有効な手段ではな
かった。
In the above-mentioned prior art, first, the heating resistor determines the flow rate of intake air supplied to the internal combustion engine by the flow velocity of a part of the intake pipe.
An output error should occur due to the structure of the intake pipe on the upstream side of the heating resistor. Further, the heating resistor has a problem that it is impossible to detect forward and reverse flows, and an output error occurs due to the influence of engine reverse flow. In addition, there is a problem that an output error occurs even when the outside air pressure changes and the temperature changes at high altitudes. Since the pressure sensor provided together is used for self-diagnosis with respect to stain deterioration of the heating resistor, it is not an effective means for the above-mentioned problems.

【0004】[0004]

【課題を解決するための手段】前記した従来技術の課題
に対し、本発明は、外気圧力変化,温度変化に対しての
パラメータである空気密度を検出する機能を持った空気
流量測定装置である。本空気流量測定装置は、圧力変化
を検知する圧力センサと吸入空気温度変化を検知する吸
気温センサを一体構成し、各々の信号により空気密度を
計測するものである。
In contrast to the above-mentioned problems of the prior art, the present invention is an air flow rate measuring device having a function of detecting the air density which is a parameter with respect to changes in outside air pressure and changes in temperature. . The present air flow rate measuring device integrally includes a pressure sensor that detects a pressure change and an intake air temperature sensor that detects a change in intake air temperature, and measures the air density by each signal.

【0005】[0005]

【作用】空気密度は、単純には、温度が高くなると、大
きくなり、また、圧力が大きくなると大きくなる傾向に
ある。これらの関係は、古くから知られている。従っ
て、圧力変化と温度変化の双方の検知センサを備えてい
れば、その信号より空気密度の検出は、可能である。空
気の質量は、前記した空気密度と体積の積により求める
ことができる。体積の計測は、実際の各気筒のエンジン
シリンダー内のピストンの上,下死点の位置を検出する
ことにより求めることができる。本発明は、この作用を
応用したものである。
The air density tends to increase as the temperature increases, and also increases as the pressure increases. These relationships have long been known. Therefore, if a sensor for detecting both pressure change and temperature change is provided, the air density can be detected from the signal. The mass of air can be obtained by the product of the air density and the volume described above. The volume can be measured by detecting the actual positions of the top and bottom dead centers of the pistons in the engine cylinders of the respective cylinders. The present invention applies this action.

【0006】[0006]

【実施例】以下、図1〜図4により本発明の実施例を説
明する。図1は本発明の一構造を示したものである。内
燃機関の吸気管1には、空気2が吸入されている。前記
した吸気管1の一部に圧力ポート4と感温抵抗体6が設
置されており、各々圧力センサ5,吸気温センサ7を構
成している。更に、これらの圧力センサ5,吸気温セン
サ7は、電気的に、演算回路8に接続されている。そし
て、更に、コネクタ9を有するハウジング内に収納され
て空気流量測定装置3を構成する。図2はブロック構成
図を示したものである。圧力センサ5からは圧力信号P
が、吸気温センサ7からは温度信号Tがそれぞれコネク
タ9を介して出力される。また、圧力センサ5からの圧
力信号P,吸気温センサ7からの温度信号Tは演算回路
8に供給され、前記演算回路8で空気密度ρを算出し、
コネクタ9を介して出力する構成になっている。図3は
本発明による空気流量測定装置3を用いたエンジン制御
の一例を示したものである。前記した空気流量測定装置
3からの圧力信号P,温度信号T,空気密度信号ρは各
々コントロールユニット10に入力される。また各気筒
からシリンダ13内のピストン14の上死点(TD
C),下死点(BDC)の位置信号が前記コントロールユ
ニット10に入力される。これら入力信号により各気筒
毎の質量空気流量が算出され、この質量空気流量に対し
最適空燃比に成るようインジェクタ12の開度時間Tp
が設定される。図4は圧力センサ5及び吸気温センサ7
で検出した電気信号により空気比重量(密度)を換算す
るテーブルである。演算回路8のメモリに本テーブルを
あらかじめ記憶することにより、空気比重量(密度)の
検出が可能となる。本発明品の採用により高精度にエン
ジン吸入空気量を検出できる。
Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 shows one structure of the present invention. Air 2 is drawn into an intake pipe 1 of the internal combustion engine. A pressure port 4 and a temperature-sensitive resistor 6 are installed in a part of the intake pipe 1 described above, and constitute a pressure sensor 5 and an intake temperature sensor 7, respectively. Further, the pressure sensor 5 and the intake air temperature sensor 7 are electrically connected to the arithmetic circuit 8. Further, the air flow rate measuring device 3 is configured by being housed in a housing having the connector 9. FIG. 2 shows a block diagram. Pressure signal P from the pressure sensor 5
However, the temperature signal T is output from the intake air temperature sensor 7 via the connector 9, respectively. The pressure signal P from the pressure sensor 5 and the temperature signal T from the intake air temperature sensor 7 are supplied to the arithmetic circuit 8, and the arithmetic circuit 8 calculates the air density ρ,
It is configured to output via the connector 9. FIG. 3 shows an example of engine control using the air flow rate measuring device 3 according to the present invention. The pressure signal P, the temperature signal T, and the air density signal ρ from the above-described air flow rate measuring device 3 are input to the control unit 10, respectively. In addition, the top dead center (TD) of the piston 14 in the cylinder 13 from each cylinder
C), the position signal of the bottom dead center (BDC) is input to the control unit 10. The mass air flow rate for each cylinder is calculated from these input signals, and the opening time Tp of the injector 12 is adjusted so as to obtain the optimum air-fuel ratio for this mass air flow rate.
Is set. FIG. 4 shows a pressure sensor 5 and an intake air temperature sensor 7.
It is a table for converting the air specific weight (density) by the electric signal detected in. By storing this table in the memory of the arithmetic circuit 8 in advance, it is possible to detect the air specific weight (density). By adopting the product of the present invention, the engine intake air amount can be detected with high accuracy.

【0007】[0007]

【発明の効果】本発明の採用により吸気管構造の影響,
エンジン逆流による影響,圧力,温度の影響が低減でき
る効果がある。
Effects of the intake pipe structure due to the adoption of the present invention,
This has the effect of reducing the effects of engine backflow, pressure, and temperature.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の一実施例を示す空気流量測定装置の断
面構造図である。
FIG. 1 is a cross-sectional structural view of an air flow rate measuring device showing an embodiment of the present invention.

【図2】内部回路のブロックダイヤグラムである。FIG. 2 is a block diagram of an internal circuit.

【図3】本発明を使用したシステム制御図である。FIG. 3 is a system control diagram using the present invention.

【図4】温度,圧力に対応した比重量(密度)の関係図
である。
FIG. 4 is a relationship diagram of specific weight (density) corresponding to temperature and pressure.

【符号の説明】[Explanation of symbols]

1…吸気管、2…空気、3…空気流量測定装置、4…圧
力ポート、5…圧力センサ、6…感温抵抗体、7…吸気
温センサ、8…演算回路、9…コネクタ、10…コント
ロールユニット、11…スロットルバルブ、12…イン
ジェクタ、13…シリンダ、14…ピストン。
1 ... Intake pipe, 2 ... Air, 3 ... Air flow rate measuring device, 4 ... Pressure port, 5 ... Pressure sensor, 6 ... Temperature sensitive resistor, 7 ... Intake temperature sensor, 8 ... Arithmetic circuit, 9 ... Connector, 10 ... Control unit, 11 ... Throttle valve, 12 ... Injector, 13 ... Cylinder, 14 ... Piston.

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 FI 技術表示箇所 F02D 45/00 360 F ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Office reference number FI technical display location F02D 45/00 360 F

Claims (5)

【特許請求の範囲】[Claims] 【請求項1】内燃機関に供給される吸入空気流量を検出
する空気流量測定装置において、吸気管内の吸気圧力を
検出する手段と、吸気温度を検出する手段を同一装置内
に備えたことを特徴とする空気流量測定装置。
1. An air flow rate measuring device for detecting a flow rate of intake air supplied to an internal combustion engine, characterized in that means for detecting an intake pressure in an intake pipe and means for detecting an intake air temperature are provided in the same device. Air flow measuring device.
【請求項2】請求項1において、吸気管内の吸気圧力を
検出する手段、吸気温度を検出する手段からの信号によ
り比重量(密度)を出力することを特徴とする空気流量
測定装置。
2. An air flow measuring device according to claim 1, wherein the specific weight (density) is output by a signal from the means for detecting the intake pressure in the intake pipe and the means for detecting the intake temperature.
【請求項3】請求項2において、吸気管内の吸気圧力を
検出する手段から圧力信号を、吸気温度を検出する手段
からは温度信号をそれぞれ出力すると同時に、前記、圧
力信号,温度信号から比重量(密度)を演算回路により
算出して出力する機能を備えたことを特徴とする空気流
量測定装置。
3. A weight signal output from the means for detecting the intake pressure in the intake pipe and a temperature signal from the means for detecting the intake temperature, and at the same time, the specific weight is output from the pressure signal and the temperature signal. An air flow rate measuring device having a function of calculating and outputting (density) by an arithmetic circuit.
【請求項4】請求項1において、吸気管内の吸気圧力を
検出する手段として、圧力センサを、吸気温度を検出す
る手段として吸気温センサを同一装置内に備えたことを
特徴とする空気流量測定装置。
4. The air flow rate measurement according to claim 1, wherein a pressure sensor is provided as a means for detecting the intake pressure in the intake pipe, and an intake temperature sensor is provided as a means for detecting the intake temperature in the same device. apparatus.
【請求項5】請求項3において、圧力信号,温度信号,
比重量(密度)信号をそれぞれ燃料制御用コントロール
ユニットに入力し、更に、内燃機関のそれぞれのエンジ
ンシリンダーのピストンヘッドの上死点(TDC),下
死点(BDC)の位置信号を入力してこれら比重量(密
度)信号,上死点(TDC),下死点(BDC)からそ
れぞれのエンジンシリンダーの吸入空気の質量流量をリ
アルタイムに、算出することを特徴とする空気流量測定
装置。
5. The pressure signal, the temperature signal, and
The specific weight (density) signal is input to the fuel control unit, and the position signals of the top dead center (TDC) and the bottom dead center (BDC) of the piston head of each engine cylinder of the internal combustion engine are input. An air flow rate measurement device, which calculates the mass flow rate of intake air of each engine cylinder in real time from these specific weight (density) signals, top dead center (TDC), and bottom dead center (BDC).
JP4677294A 1994-03-17 1994-03-17 Air flow measuring device Pending JPH07260534A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4677294A JPH07260534A (en) 1994-03-17 1994-03-17 Air flow measuring device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4677294A JPH07260534A (en) 1994-03-17 1994-03-17 Air flow measuring device

Publications (1)

Publication Number Publication Date
JPH07260534A true JPH07260534A (en) 1995-10-13

Family

ID=12756626

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4677294A Pending JPH07260534A (en) 1994-03-17 1994-03-17 Air flow measuring device

Country Status (1)

Country Link
JP (1) JPH07260534A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004074661A1 (en) * 2003-02-20 2004-09-02 Mikuni Corporation Sensor module unit and throttle device with the same
JP2005283228A (en) * 2004-03-29 2005-10-13 Kimmon Mfg Co Ltd Gas meter
JP2008088937A (en) * 2006-10-04 2008-04-17 Mitsubishi Electric Corp Detector and engine control device
US7415346B2 (en) 2003-10-22 2008-08-19 Mikuni Corporation Air intake device, sensor unit, two-wheeled vehicle, and intake air temperature detection method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004074661A1 (en) * 2003-02-20 2004-09-02 Mikuni Corporation Sensor module unit and throttle device with the same
US7305966B2 (en) 2003-02-20 2007-12-11 Mikuni Corporation Sensor module unit and a throttle apparatus equipped with the sensor module unit
CN100392221C (en) * 2003-02-20 2008-06-04 株式会社三国 Sensor module unit and throttle device with the same
US7415346B2 (en) 2003-10-22 2008-08-19 Mikuni Corporation Air intake device, sensor unit, two-wheeled vehicle, and intake air temperature detection method
JP2005283228A (en) * 2004-03-29 2005-10-13 Kimmon Mfg Co Ltd Gas meter
JP2008088937A (en) * 2006-10-04 2008-04-17 Mitsubishi Electric Corp Detector and engine control device

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