JPH0666167A - Intake air flow detecting device for internal combustion engine equipped with supercharger - Google Patents
Intake air flow detecting device for internal combustion engine equipped with superchargerInfo
- Publication number
- JPH0666167A JPH0666167A JP4217998A JP21799892A JPH0666167A JP H0666167 A JPH0666167 A JP H0666167A JP 4217998 A JP4217998 A JP 4217998A JP 21799892 A JP21799892 A JP 21799892A JP H0666167 A JPH0666167 A JP H0666167A
- Authority
- JP
- Japan
- Prior art keywords
- supercharging
- flow rate
- supercharger
- air flow
- superchargers
- 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
Landscapes
- Supercharger (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は過給機付内燃機関の吸入
空気流量検出装置に関し、詳しくは、過給機による過給
圧変化による吸入空気流量の検出エラーを高精度に補正
し得る装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake air flow rate detecting device for an internal combustion engine with a supercharger, and more particularly to a device capable of highly accurately correcting an intake air flow rate detection error due to a change in supercharging pressure by the supercharger. Regarding
【０００２】[0002]
【従来の技術】従来から、内燃機関への燃料供給量を電
子制御する装置において、機関の吸入空気流量を検出す
るエアフローメータを設け、このエアフローメータで検
出された吸入空気流量と機関回転速度とに基づいて燃料
供給量を演算する構成のものが知られている（特開昭５
８−１５００４０号公報，特開昭５９−４９３３４号公
報等参照）。2. Description of the Related Art Conventionally, in a device for electronically controlling the fuel supply amount to an internal combustion engine, an air flow meter for detecting the intake air flow rate of the engine is provided, and the intake air flow rate and the engine rotation speed detected by the air flow meter are There is known a configuration in which the fuel supply amount is calculated based on
8-150040, JP-A-59-49334, etc.).
【０００３】[0003]
【発明が解決しようとする課題】ところで、過給機を備
えた機関では、スロットル弁上流の過給圧の変化によっ
て、過給機からスロットル弁までの過給室に充填される
空気量が変化するため、過渡運転時には前記変化分だけ
エアフローメータによる検出流量に誤差を生じることに
なる。In an engine equipped with a supercharger, the amount of air filled in the supercharging chamber from the supercharger to the throttle valve changes due to changes in the supercharging pressure upstream of the throttle valve. Therefore, during transient operation, the flow rate detected by the air flow meter has an error due to the change.
【０００４】そこで、前記過給室内の充填空気量の変化
分を検出し、該検出結果に基づいてエアフローメータに
よって検出された吸入空気流量を補正することで、過渡
時の空燃比制御精度を確保するようにしている。ここ
で、図２に示すように、２つの過給機５，６を同一吸気
系に対して並列に設け、一方の過給機のみで過給させる
か、又は、両方の過給機で同時に過給を行わせるかを機
関運転条件に応じて切り換える過給システムがある。か
かる過給システムの場合、２つの過給機を同時に作動さ
せる場合と、一方の過給機のみを作動させる場合とで
は、前記過給室の容積が異なるため、一定の容積に基づ
いて前記充填空気量を求める構成であると、補正精度が
過給機の作動状態によって悪化してしまうという問題が
あった。Therefore, by detecting the amount of change in the filling air amount in the supercharging chamber and correcting the intake air flow rate detected by the air flow meter based on the detection result, the accuracy of the air-fuel ratio control at the time of transition is ensured. I am trying to do it. Here, as shown in FIG. 2, two superchargers 5 and 6 are provided in parallel with respect to the same intake system and supercharged by only one supercharger, or both superchargers simultaneously. There is a supercharging system that switches whether to perform supercharging according to engine operating conditions. In the case of such a supercharging system, since the volume of the supercharging chamber is different between the case where two superchargers are operated simultaneously and the case where only one supercharger is operated, the filling is performed based on a constant volume. With the configuration for obtaining the air amount, there is a problem that the correction accuracy is deteriorated depending on the operating state of the supercharger.
【０００５】本発明は上記問題点に鑑みなされたもので
あり、２つの過給機を備える内燃機関において、２つの
過給機が選択的に作動されても、過給室に充填される空
気量を高精度に求めて、機関吸入空気流量の検出値を高
精度に補正できるようにすることを目的とする。The present invention has been made in view of the above problems, and in an internal combustion engine having two superchargers, even if the two superchargers are selectively operated, the air charged in the supercharge chamber is filled with air. It is an object of the present invention to obtain the amount with high precision and correct the detected value of the engine intake air flow rate with high precision.
【０００６】[0006]
【課題を解決するための手段】そのため本発明にかかる
過給機付内燃機関の吸入空気流量検出装置は、機関の同
一吸気系に対して２つの過給機を備え、前記２つの過給
機の一方のみによる過給と、両方の過給機による同時過
給とを機関運転条件に応じて選択的に実行させ、過給さ
れた空気をスロットル弁によって調整して機関に吸引さ
せる過給機付内燃機関の吸入空気流量検出装置であっ
て、図１に示すように構成される。Therefore, an intake air flow rate detecting device for an internal combustion engine with a supercharger according to the present invention is provided with two superchargers for the same intake system of the engine, and the two superchargers are provided. A supercharger that selectively performs supercharging by only one of them and simultaneous supercharging by both superchargers according to engine operating conditions, and adjusts the supercharged air by a throttle valve to suck it into the engine. FIG. 1 is an intake air flow rate detecting device for an internal combustion engine with an internal combustion engine.
【０００７】図１において、流量検出手段は、前記２つ
の過給機の上流側で機関の吸入空気流量を検出し、過給
圧検出手段は、前記２つの過給機による過給圧を検出す
る。そして、流量補正手段は、過給圧検出手段で検出さ
れた過給圧と過給された空気が充填されるスロットル弁
上流側の過給室の容積とに基づいて、前記流量検出手段
で検出された吸入空気流量を補正設定する。In FIG. 1, the flow rate detecting means detects the intake air flow rate of the engine on the upstream side of the two superchargers, and the supercharging pressure detecting means detects the supercharging pressure by the two superchargers. To do. The flow rate correcting means detects the supercharging pressure detected by the supercharging pressure detecting means and the volume of the supercharging chamber on the upstream side of the throttle valve filled with the supercharged air by the flow rate detecting means. The corrected intake air flow rate is set.
【０００８】ここで、過給状態判別手段は、前記２つの
過給機の一方のみによる過給と、両方の過給機による同
時過給とのいずれが実行されているかを判別し、容積切
り換え設定手段は、過給状態判別手段による判別に応じ
て前記流量補正手段で用いる過給室の容積を切り換え設
定する。Here, the supercharging state judging means judges whether supercharging by only one of the two superchargers or simultaneous supercharging by both superchargers is being executed, and the volume is switched. The setting means switches and sets the volume of the supercharging chamber used in the flow rate correcting means according to the determination by the supercharging state determining means.
【０００９】[0009]
【作用】かかる構成によると、過給圧と過給室の容積と
に基づいて、流量検出手段で検出された吸入空気流量
が、前記過給室の充填空気量に応じて補正されるが、２
つの過給機を同時に作動させている状態であるか、又
は、一方の過給機のみを作動させている状態であるかに
よって前記過給室の容積が異なるので、前記過給機の作
動状態を判別して、実際の過給室容積の変化に対応させ
て充填空気量分の補正が精度良く行えるようにした。According to this structure, the intake air flow rate detected by the flow rate detecting means is corrected based on the supercharging pressure and the volume of the supercharging chamber according to the filling air amount of the supercharging chamber. Two
Since the volume of the supercharging chamber differs depending on whether two superchargers are operating at the same time or only one supercharger is operating, the operating state of the supercharger Is determined, and the correction of the filling air amount can be accurately performed according to the actual change of the supercharging chamber volume.
【００１０】[0010]
【実施例】以下に本発明の一実施例を説明する。図２
は、本実施例の過給機付内燃機関における吸気系を示す
図である。ここで、エアクリーナ１を通過した空気は、
流量検出手段としてのエアフローメータ２で計量された
後、２つに分岐延設される吸気ダクト３ａ，３ｂを通過
し、前記吸気ダクト３ａ，３ｂの下流側合流部に介装さ
れ図示しないアクセルペダルと連動するスロットル弁４
を通過して、図示しない吸気マニホールドを介して各気
筒内に吸引されるようになっており、前記スロットル弁
４によって吸入空気流量が調整されるようになってい
る。EXAMPLE An example of the present invention will be described below. Figure 2
FIG. 3 is a diagram showing an intake system in an internal combustion engine with a supercharger of the present embodiment. Here, the air that has passed through the air cleaner 1 is
After being measured by an air flow meter 2 serving as a flow rate detecting means, it passes through two intake ducts 3a and 3b branched and extended, and is interposed at a downstream merging portion of the intake ducts 3a and 3b, and an accelerator pedal (not shown) is provided. Throttle valve 4 that works with
And is sucked into each cylinder via an intake manifold (not shown), and the intake air flow rate is adjusted by the throttle valve 4.
【００１１】また、前記吸気ダクト３ａ，３ｂには、そ
れぞれ過給機５，６が介装されている。この過給機５，
６は、排気のエネルギによって排気タービンを回転駆動
させることにより、前記排気タービンと軸結されたコン
プレッサ５ａ，６ａを回転駆動して、吸入空気を過給す
る排気ターボチャージャである。但し、機関の出力軸に
よってコンプレッサを機械的に駆動する過給機であって
も良い。Further, superchargers 5 and 6 are provided in the intake ducts 3a and 3b, respectively. This supercharger 5,
Reference numeral 6 denotes an exhaust turbocharger that rotationally drives the exhaust turbine by the energy of the exhaust gas to rotationally drive the compressors 5a and 6a axially connected to the exhaust turbine to supercharge intake air. However, it may be a supercharger in which the compressor is mechanically driven by the output shaft of the engine.
【００１２】前記過給機５が介装される側の吸気ダクト
３ａには、過給機５の下流側に吸気制御弁７が介装され
ており、また、この吸気制御弁７の上下流間の差圧ΔＰ
を検出する差圧センサ８が設けられている。更に、過給
機５をバイパスするバイパス通路９が設けられており、
このバイパス通路９の途中にはバイパス制御弁10が介装
されている。An intake control valve 7 is installed downstream of the supercharger 5 in the intake duct 3a on the side where the supercharger 5 is installed. Differential pressure between ΔP
A differential pressure sensor 8 for detecting Further, a bypass passage 9 that bypasses the supercharger 5 is provided,
A bypass control valve 10 is provided in the middle of the bypass passage 9.
【００１３】前記吸気制御弁７及びバイパス制御弁10
は、コントロールユニット12によって開閉駆動制御され
るようになっており、初期設定として、前記吸気制御弁
７を閉じると共に、前記バイパス制御弁10を開き、過給
機５によって過給された空気を、バイパス通路９を介し
て過給機５上流側の吸気ダクト３ａに戻して、過給機５
による機関吸入空気の過給を行わせず、過給機５を空回
りさせる。従って、かかる初期設定状態では、過給機６
のみによって吸入空気の過給が行われる。The intake control valve 7 and the bypass control valve 10
Is controlled to be opened and closed by a control unit 12, and as an initial setting, the intake control valve 7 is closed, the bypass control valve 10 is opened, and the air supercharged by the supercharger 5 is Return to the intake duct 3a on the upstream side of the supercharger 5 via the bypass passage 9,
The supercharger 5 is idled without supercharging the engine intake air. Therefore, in the initial setting state, the supercharger 6
The intake air is supercharged only by the intake air.
【００１４】一方、かかる初期設定状態において、機関
が高負荷運転され、前記差圧センサ８で検出される差圧
が所定値以下となると、前記吸気制御弁７を開くと共
に、前記バイパス制御弁10を閉じることによって、過給
機６と共に過給機５によっても吸入空気の過給を行わせ
るようになっている。このように、機関運転条件によっ
て、過給機６のみによる過給と、２つの過給機５，６両
方を用いた同時過給とを選択的に実行させるようになっ
ており、本実施例では、過給機６のみの過給をシングル
過給、２つの過給機５，６を両方用いた同時過給をツイ
ン過給と称する。On the other hand, when the engine is operated under a high load and the differential pressure detected by the differential pressure sensor 8 becomes a predetermined value or less in the initial setting state, the intake control valve 7 is opened and the bypass control valve 10 is opened. The intake air is supercharged not only by the supercharger 6 but also by the supercharger 5 by closing. As described above, depending on the engine operating conditions, supercharging by only the supercharger 6 and simultaneous supercharging by using both the two superchargers 5, 6 are selectively executed. In the above, supercharging of only the supercharger 6 is referred to as single supercharging, and simultaneous supercharging using both of the superchargers 5 and 6 is referred to as twin supercharging.
【００１５】また、前記エアフローメータ２で検出され
る機関吸入空気流量Ｑは、電子制御燃料噴射装置を構成
する前記コントロールユニット12に出力され、ここで吸
入空気流量Ｑと機関回転速度Ｎｅとに基づいて基本燃料
噴射量Ｔｐが演算され、該基本燃料噴射量Ｔｐに基づい
て図示しない電磁式燃料噴射弁を開駆動制御するように
なっている。The engine intake air flow rate Q detected by the air flow meter 2 is output to the control unit 12 constituting an electronically controlled fuel injection device, where the intake air flow rate Q and the engine speed Ne are used. Then, the basic fuel injection amount Tp is calculated, and based on the basic fuel injection amount Tp, the open drive control of the electromagnetic fuel injection valve (not shown) is performed.
【００１６】ところで、上記のように過給機５，６によ
る過給が行われる機関では、過給圧の変化によってスロ
ットル弁４の上流側の過給室に充填される空気量が変化
するが、エアフローメータ２は、前記充填空気の変化分
も検出するために、真の吸入空気流量を検出できなくな
る。そこで、本実施例では、図３のフローチャートに示
すように、前記充填空気量の変化を検出してエアフロー
メータ２による検出流量を補正するようにしてある。
尚、前記充填空気量の検出のために、吸気ダクト３ｂの
過給機６下流側で過給圧ＰTCを検出する過給圧検出手段
としての過給圧センサ11が設けられている。In the engine which is supercharged by the superchargers 5 and 6 as described above, the amount of air filled in the supercharging chamber upstream of the throttle valve 4 changes due to the change in supercharging pressure. Since the air flow meter 2 also detects the amount of change in the filled air, it cannot detect the true intake air flow rate. Therefore, in the present embodiment, as shown in the flow chart of FIG. 3, the change in the filling air amount is detected and the flow rate detected by the air flow meter 2 is corrected.
A supercharging pressure sensor 11 as supercharging pressure detecting means for detecting the supercharging pressure P TC is provided on the downstream side of the supercharger 6 of the intake duct 3b in order to detect the filling air amount.
【００１７】尚、本実施例において、流量補正手段，容
積切り換え設定手段，過給状態判別手段としての機能
は、前記図３のフローチャートに示すように、コントロ
ールユニット12がソフトウェア的に備えている。図３の
フローチャートにおいて、まず、ステップ１（図中では
Ｓ１としてある。以下同様）では、燃料噴射制御のため
のデータとして機関回転速度Ｎｅ，吸入空気流量Ｑ，冷
却水温度Ｔｗなどの検出値を入力すると共に、エアフロ
ーメータ２の検出値を補正するためのデータとして前記
差圧センサ８の検出値ΔＰ及び過給圧センサ11の検出値
ＰTCを入力する。In the present embodiment, the control unit 12 is provided with software functions as a flow rate correction means, a volume switching setting means, and a supercharging state determination means, as shown in the flow chart of FIG. In the flowchart of FIG. 3, first, in step 1 (denoted as S1 in the figure; the same applies hereinafter), detected values such as the engine speed Ne, the intake air flow rate Q, and the cooling water temperature Tw are used as data for fuel injection control. In addition to the input, the detection value ΔP of the differential pressure sensor 8 and the detection value P TC of the supercharging pressure sensor 11 are input as data for correcting the detection value of the air flow meter 2.
【００１８】次のステップ２では、シングル過給又はツ
イン過給のいずれの過給状態であるかを判別する。かか
る判別においては、前記差圧センサ８の検出値ΔＰを判
別情報として用いるが、この他、吸入空気流量Ｑ及び機
関回転速度Ｎｅの情報を用いるようにしても良い。シン
グル過給状態であると判別されたときには、ステップ３
へ進み、過給圧Ｐ TCの微分値ΔＰTCと、スロットル弁上
流側で過給空気が充填される過給室の容積Ｖとに基づい
て、前記過給室内の充填空気量の変化分ＱTC１を求め
る。In the next step 2, single supercharging or
It is determined which of the supercharging state of the supercharging is in. Scarecrow
In the determination, the detection value ΔP of the differential pressure sensor 8 is determined.
In addition to this, it is used as separate information.
You may make it use the information of the object rotation speed Ne. Shin
If it is determined that the vehicle is in a supercharged state, step 3
Go to, boost pressure P TCDifferential value of ΔPTCAnd above the throttle valve
Based on the volume V of the supercharging chamber filled with supercharging air on the flow side
And the change amount Q of the filling air amount in the supercharging chamberTCSeeking 1
It
【００１９】前記シングル過給においては、吸気制御弁
７が閉じられているから、前記過給室は、過給機６から
スロットル弁４までの部分に、吸気制御弁７からスロッ
トル弁４までの部分を加えた部分であり、前記容積Ｖは
この部分の容積を示す値である。過給圧ＰTCの増大変化
時（加速時）には、充填空気量も増大するから、かかる
増大分だけエアフローメータ２が余分に吸入空気流量Ｑ
を検出することになる。逆に、過給圧ＰTCの減少変化時
（減速時）には、充填空気量は減少するから、かかる減
少分だけエアフローメータ２が少なめに吸入空気流量を
検出することになる。In the single supercharging, since the intake control valve 7 is closed, the supercharging chamber extends from the supercharger 6 to the throttle valve 4 and from the intake control valve 7 to the throttle valve 4. The volume V is a value indicating the volume of this portion. When the supercharging pressure P TC increases and changes (at the time of acceleration), the filling air amount also increases. Therefore, the air flow meter 2 additionally receives the intake air flow rate Q due to the increase.
Will be detected. On the contrary, when the supercharging pressure P TC decreases (decelerates), the filling air amount decreases, so the air flow meter 2 slightly detects the intake air flow rate by the decrease amount.
【００２０】そこで、次のステップ４では、エアフロー
メータ２で検出される吸入空気流量Ｑ（ＡＦ／Ｍ Ｑ）
から前記充填空気量の変化分ＱTC１を減算し、これを最
終的な吸入空気流量のデータＦＱにセットする。一方、
ステップ２でツイン過給状態であると判別されたときに
は、ステップ５へ進み、同様に過給室の充填空気量の変
化分ＱTC２を演算する。但し、この場合は、吸気制御弁
７が開かれることによって過給空気が充填される過給室
の容積が吸気制御弁７から過給機５までの容積分αだけ
増大する。そこで、過給圧ＰTCの微分値ΔＰTCに、前記
シングル過給時の容積として用いたＶに前記増大容積分
αを加算した容積を乗算して、ツイン過給における過給
室の充填空気量の変化分Ｑ TC２を演算する。Therefore, in the next step 4, the air flow is
Intake air flow rate Q (AF / M Q) detected by meter 2
To the change amount Q of the filling air amountTCSubtract 1 and add
The final intake air flow rate data FQ is set. on the other hand,
When it is determined in step 2 that the twin supercharged state is in effect
Goes to step 5, and similarly changes the charging air amount in the supercharging chamber.
Amount QTCCalculate 2. However, in this case, the intake control valve
Supercharging chamber filled with supercharged air by opening 7
Is the volume α from the intake control valve 7 to the supercharger 5
Increase. Therefore, the boost pressure PTCDifferential value of ΔPTCIn the above
The above-mentioned increased volume is added to V used as the volume at the time of single supercharging.
Multiply the volume by adding α to obtain supercharging in twin supercharging
Change in the amount of air filled in the chamber Q TCCalculate 2.
【００２１】そして、次のステップ６では、前記変化分
ＱTC２を用いて、前記ステップ４と同様にしてエアフロ
ーメータ２による検出値を補正する。このように、ツイ
ン過給であるかシングル過給であるかによって過給室容
積を切り換え設定し、過給室内の充填空気量の変化を演
算し、エアフローメータ２の検出値を補正すると、ステ
ップ７では、前記充填空気量に基づいて補正された吸入
空気流量ＦＱに基づいて燃料噴射量を演算する。そし
て、次のステップ８では、前記演算された燃料噴射量に
基づいて燃料噴射弁を駆動制御することで、機関の吸入
空気量に見合った燃料を噴射供給する。Then, in the next step 6, the detected value by the air flow meter 2 is corrected using the variation Q TC 2 in the same manner as in step 4. In this way, the volume of the supercharging chamber is switched and set depending on whether twin supercharging or single supercharging is performed, the change in the filling air amount in the supercharging chamber is calculated, and the detected value of the air flow meter 2 is corrected. In step 7, the fuel injection amount is calculated based on the intake air flow rate FQ corrected based on the filling air amount. Then, in the next step 8, the fuel injection valve is driven and controlled based on the calculated fuel injection amount, so that fuel corresponding to the intake air amount of the engine is injected and supplied.
【００２２】ここで、前記吸入空気流量ＦＱは、過給圧
の変化による充填空気量の変化分を補正されているか
ら、過渡運転時であっても実際の吸入空気量に精度良く
対応した燃料噴射制御を実現できる。然も、前記充填空
気量の変化分を求めるに当たって、シングル過給状態で
あるか、ツイン過給状態であるかを判別し、かかる過給
状態（過給機の作動状態）の違いによる過給室容積の変
化に応じて充填空気量を求めるから、過給機の作動状態
によって充填空気量の検出精度が悪化することがなく、
真の充填空気量の変化分に見合った補正を施すことがで
きる。Here, since the intake air flow rate FQ is corrected for the amount of change in the charging air amount due to the change in supercharging pressure, the fuel that accurately corresponds to the actual intake air amount even during the transient operation. Injection control can be realized. However, when determining the amount of change in the filled air amount, it is determined whether the turbocharger is in the single supercharging state or the twin supercharging state, and the supercharging depending on the difference in the supercharging state (the operating state of the supercharger). Since the filling air amount is calculated according to the change in the chamber volume, the detection accuracy of the filling air amount does not deteriorate due to the operating state of the supercharger.
It is possible to make a correction corresponding to the change amount of the true filling air amount.
【００２３】ところで、前記過給圧ＰTCの脈動影響を回
避すべく、センサ検出値を加重平均した値ＰTCAVを前記
充填空気量の検出に用いるときに、過給圧変動が急激と
なるシングル過給とツイン過給との間の切り換え時に
は、通常時よりも加重重みを軽くして、実際の過給圧変
化に応答良く追従できるようにすると良い。図４のフロ
ーチャートは、前記過給圧ＰTCの加重平均処理を示すも
のであり、まず、ステップ11では、過給状態がシングル
過給とツイン過給との間で切り換えられる状態であるか
否かを判別する。By the way, in order to avoid the pulsation effect of the supercharging pressure P TC , when the value P TCAV obtained by weighted averaging the sensor detection values is used for the detection of the filling air amount, the supercharging pressure fluctuates rapidly. At the time of switching between the supercharging and the twin supercharging, it is preferable that the weighting weight be lighter than in the normal state so that the actual supercharging pressure change can be followed with good response. The flowchart of FIG. 4 shows the weighted average processing of the supercharging pressure P TC . First, at step 11, whether or not the supercharging state is switched between single supercharging and twin supercharging is determined. Determine whether.
【００２４】そして、過給状態の切り換え時であるとき
には、ステップ12へ進み、実際の切り換え制御が行われ
てからの経過時間が所定時間内であるか否かを判別す
る。ここで、切り換え制御直後であると判別されたとき
には、ステップ13へ進み、切り換えの方向がツイン過給
→シングル過給、シングル過給→ツイン過給のいずれで
あるかを判別する。Then, when it is time to switch the supercharging state, the routine proceeds to step 12, where it is judged whether or not the elapsed time after the actual switching control is performed is within a predetermined time. If it is determined that the switching control has just been performed, the process proceeds to step 13, and it is determined whether the switching direction is twin supercharging → single supercharging or single supercharging → twin supercharging.
【００２５】そして、ツイン過給→シングル過給、シン
グル過給→ツイン過給のいずれであるかによって、ステ
ップ14又はステップ15に進み、それぞれ異なる重み付け
定数ＫＳ，ＴＳに基づいて、以下のようにして過給圧Ｐ
TCの加重平均値ＰTCAVを演算する。 ＰTCAV←（ＰTC＋２KS-1・ＰTCAV-1）／２KS ＰTCAV←（ＰTC＋２TS-1・ＰTCAV-1）／２TS 前記重み付け定数ＫＳ，ＴＳは、ＫＳ＜ＴＳとしてあ
り、これにより、過給圧の変化がより急激なシングル過
給→ツイン過給切り換え時に、過給圧変化に応答良く追
従させることができるようにしてある。Then, depending on whether twin supercharging → single supercharging or single supercharging → twin supercharging, the routine proceeds to step 14 or step 15, and based on different weighting constants KS and TS, the following is performed. Boost pressure P
Calculate the weighted average value P TCAV of TC . P TCAV ← (P TC +2 KS-1 · P TCAV-1 ) / 2 KS P TCAV ← (P TC +2 TS-1 · P TCAV-1 ) / 2 TS The weighting constants KS and TS are KS <TS. By doing so, it is possible to follow the change in supercharging pressure with good response when switching from single supercharging to twin supercharging in which the change in supercharging pressure is more rapid.
【００２６】一方、切り換えから所定時間以上経過して
いる非切り換え時においては、ステップ16へ進み、重み
付け定数ＫＸを用いて以下のように加重平均させる。 ＰTCAV←（ＰTC＋２KX-1・ＰTCAV-1）／２KX 上記重み付け定数ＫＸは、前記重み付け定数ＫＳ，ＴＳ
のいずれよりも大きな値に設定してあり、これにより、
比較的過給圧変化の少ないときに、過給圧の脈動影響を
良好に回避できる。On the other hand, at the time of non-switching after a lapse of a predetermined time after switching, the routine proceeds to step 16, where the weighted constant KX is used to perform weighted averaging as follows. P TCAV ← (P TC +2 KX-1 · P TCAV-1 ) / 2 KX The weighting constant KX is the weighting constant KS, TS.
Is set to a value greater than
When the change in the boost pressure is relatively small, the pulsating effect of the boost pressure can be favorably avoided.
【００２７】上記のように、シングル過給，ツイン過給
の切り換え時であるか否か、及び、切り換えの方向に基
づいて重み付け定数を切り換えて加重平均させれば、実
際の過給圧の変化速度に対応した加重平均を施すことが
でき、過給圧変化に対する応答性を確保しつつ、脈動影
響を良好に回避でき、かかる加重平均値ＰTCAVを用いて
過給室内の充填空気量を精度良く求められる。As described above, if the weighting constants are switched and weighted averaged based on whether or not it is during switching between single supercharging and twin supercharging, and the direction of switching, the actual supercharging pressure changes. A weighted average corresponding to speed can be applied, responsiveness to changes in supercharging pressure can be secured, and pulsation effects can be satisfactorily avoided. Using the weighted average value P TCAV , the amount of air filled in the supercharging chamber can be accurately determined. It is often requested.
【００２８】尚、本実施例では、過給圧ＰTCの変化に過
給室容積を乗算して、充填空気量の変化分を簡便に求め
たが、充填空気量を求める方法を限定するものではな
く、過給圧ＰTCと過給室容積とを用いて充填空気量を求
める構成であれば良く、例えば過給圧ＰTCと過給室充填
空気の温度とから過給室内の密度を求め、この密度変化
と過給室容積とに基づいて充填空気量の変化を求めるよ
うにしても良い。In this embodiment, the change in the supercharging pressure P TC is multiplied by the supercharging chamber volume to easily obtain the change in the filled air amount, but the method for obtaining the filled air amount is limited. rather, may have a configuration for obtaining the charged air amount using the supercharging pressure P TC supercharging chamber volume, the density of the supercharging chamber, for example, from a boost pressure P TC and the temperature of the supercharging chamber filling air Then, the change in the filling air amount may be calculated based on the density change and the supercharging chamber volume.
【００２９】また、本実施例では、２つの過給機５，６
を、同一吸気系に対して並列に設けたが、２つの過給機
を直列に設け、機関運転条件によって両方又は一方のみ
を作動させる構成の機関であっても良い。Further, in this embodiment, two superchargers 5, 6 are used.
Are provided in parallel with respect to the same intake system, but two superchargers may be provided in series, and both or only one may be operated depending on engine operating conditions.
【００３０】[0030]
【発明の効果】以上説明したように本発明によると、２
つの過給機を選択的に作動させることによって過給室の
容積が変化する過給機付内燃機関において、前記過給室
の充填空気量の変化に応じた吸入空気流量の検出エラー
を、前記容積変化に対応して高精度に補正することがで
き、例えば吸入空気流量の検出値に基づいて燃料噴射量
を制御するシステムにあっては、過渡運転時の燃料制御
精度が向上するという効果がある。As described above, according to the present invention, 2
In an internal combustion engine with a supercharger in which the volume of the supercharging chamber changes by selectively operating one of the superchargers, the detection error of the intake air flow rate according to the change of the filling air amount of the supercharging chamber is It can be corrected with high accuracy according to the volume change. For example, in a system that controls the fuel injection amount based on the detected value of the intake air flow rate, the effect of improving the fuel control accuracy during transient operation is is there.
【図１】本発明の構成を示すブロック図。FIG. 1 is a block diagram showing a configuration of the present invention.
【図２】本発明の一実施例を示すシステム概略図。FIG. 2 is a system schematic diagram showing an embodiment of the present invention.
【図３】吸入空気流量の補正制御を示すフローチャー
ト。FIG. 3 is a flowchart showing correction control of an intake air flow rate.
【図４】過給圧の加重平均を示すフローチャート。FIG. 4 is a flowchart showing a weighted average of supercharging pressure.
２ エアフローメータ（流量検出手段） ３ａ，３ｂ 吸気ダクト ４ スロットル弁 ５，６ 過給機 ７ 吸気制御弁 ８ 差圧センサ ９ バイパス通路 10 バイパス制御弁 11 過給圧センサ（過給圧検出手段） 12 コントロールユニット 2 Air flow meter (flow rate detecting means) 3a, 3b Intake duct 4 Throttle valve 5, 6 Supercharger 7 Intake control valve 8 Differential pressure sensor 9 Bypass passage 10 Bypass control valve 11 Supercharging pressure sensor (supercharging pressure detecting means) 12 control unit
Claims (1)
備え、前記２つの過給機の一方のみによる過給と、両方
の過給機による同時過給とを機関運転条件に応じて選択
的に実行させ、過給された空気をスロットル弁によって
調整して機関に吸引させる過給機付内燃機関の吸入空気
流量検出装置であって、 前記２つの過給機の上流側で機関の吸入空気流量を検出
する流量検出手段と、 前記２つの過給機による過給圧を検出する過給圧検出手
段と、 該過給圧検出手段で検出された過給圧と過給された空気
が充填されるスロットル弁上流側の過給室の容積とに基
づいて、前記流量検出手段で検出された吸入空気流量を
補正設定する流量補正手段と、 前記２つの過給機の一方のみによる過給と、両方の過給
機による同時過給とのいずれが実行されているかを判別
する過給状態判別手段と、 該過給状態判別手段による判別に応じて前記流量補正手
段で用いる過給室の容積を切り換え設定する容積切り換
え設定手段と、 を含んで構成されたことを特徴とする過給機付内燃機関
の吸入空気流量検出装置。1. A supercharger comprising two superchargers for the same intake system of an engine, wherein supercharging by only one of the two superchargers and simultaneous supercharging by both superchargers are used as engine operating conditions. An intake air flow rate detection device for an internal combustion engine with a supercharger, which is selectively executed in accordance with the above, adjusts the supercharged air by a throttle valve, and sucks the air into the engine. Flow rate detecting means for detecting the intake air flow rate of the engine, supercharging pressure detecting means for detecting supercharging pressure by the two superchargers, and supercharging pressure and supercharging pressure detected by the supercharging pressure detecting means. Flow rate correction means for correcting and setting the intake air flow rate detected by the flow rate detection means based on the volume of the supercharging chamber on the upstream side of the throttle valve filled with air, and only one of the two superchargers Both supercharging by the supercharger and simultaneous supercharging by both turbochargers And a volume switching setting means for switching and setting the volume of the supercharging chamber used by the flow rate correcting means according to the determination by the supercharging state determining means. An intake air flow rate detection device for an internal combustion engine with a supercharger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4217998A JPH0666167A (en) | 1992-08-17 | 1992-08-17 | Intake air flow detecting device for internal combustion engine equipped with supercharger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4217998A JPH0666167A (en) | 1992-08-17 | 1992-08-17 | Intake air flow detecting device for internal combustion engine equipped with supercharger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0666167A true JPH0666167A (en) | 1994-03-08 |
Family
ID=16713026
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4217998A Pending JPH0666167A (en) | 1992-08-17 | 1992-08-17 | Intake air flow detecting device for internal combustion engine equipped with supercharger |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0666167A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3001018A1 (en) | 2014-09-26 | 2016-03-30 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Control device for internal combustion engine |
-
1992
- 1992-08-17 JP JP4217998A patent/JPH0666167A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3001018A1 (en) | 2014-09-26 | 2016-03-30 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Control device for internal combustion engine |
| US9828923B2 (en) | 2014-09-26 | 2017-11-28 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Control device for internal combustion engine |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7047740B2 (en) | Boost pressure estimation apparatus for internal combustion engine with supercharger | |
| US6318083B1 (en) | Intake air control device of an engine with a charger and method thereof | |
| JP4306703B2 (en) | Control device for an internal combustion engine with a supercharger | |
| JP4375369B2 (en) | Control device for an internal combustion engine with a supercharger | |
| US10006383B2 (en) | Control device and control method for an internal combustion engine with a supercharger | |
| CN110645110B (en) | Control device for internal combustion engine | |
| EP1245818B1 (en) | Air-fuel ratio control apparatus and method for internal combustion engine | |
| US7546760B2 (en) | Device for pressure-based load detection | |
| JP2005061243A (en) | Supercharging device for internal combustion engine | |
| JP2001073789A (en) | Supercharging pressure control system for internal combustion engine | |
| JP3846462B2 (en) | Bypass valve control device for electric supercharging mechanism | |
| JP3956458B2 (en) | Fuel injection control device for internal combustion engine | |
| JP3988691B2 (en) | Supercharger for internal combustion engine | |
| JPH0666167A (en) | Intake air flow detecting device for internal combustion engine equipped with supercharger | |
| JP2001193573A (en) | Control device for internal combustion engine | |
| JP2528385B2 (en) | Intake air amount detector for internal combustion engine with supercharger | |
| JP4428150B2 (en) | Engine intake control device | |
| JP3826887B2 (en) | Control device for electric supercharging mechanism | |
| JP3551706B2 (en) | Engine intake control device | |
| JP3651012B2 (en) | Fuel supply control device for an internal combustion engine with a supercharger | |
| JP2622625B2 (en) | Intake air flow rate detection device and fuel supply control device for internal combustion engine | |
| JP2000303895A (en) | Internal combustion engine | |
| JP2000130265A (en) | Egr device and engine controller | |
| JP3397584B2 (en) | Electric throttle type internal combustion engine | |
| JP2001152915A (en) | Intake control device for engine having supercharger |