JP3538825B2 - EGR control device for internal combustion engine - Google Patents
EGR control device for internal combustion engineInfo
- Publication number
- JP3538825B2 JP3538825B2 JP25724196A JP25724196A JP3538825B2 JP 3538825 B2 JP3538825 B2 JP 3538825B2 JP 25724196 A JP25724196 A JP 25724196A JP 25724196 A JP25724196 A JP 25724196A JP 3538825 B2 JP3538825 B2 JP 3538825B2
- Authority
- JP
- Japan
- Prior art keywords
- target
- egr rate
- fuel injection
- injection timing
- correction
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Landscapes
- Exhaust-Gas Circulating Devices (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、内燃機関の排気環
流（ＥＧＲ（ｅｘｈａｕｓｔ ｇａｓ ｒｅｃｉｒｃｕ
ｌａｔｉｏｎ）制御、特にディーゼルエンジンのＥＧＲ
制御技術に関するものである。The present invention relates to an exhaust gas recirculation (EGR) of an internal combustion engine.
control, especially EGR of diesel engines
It concerns control technology.
【０００２】[0002]
【従来の技術】従来の内燃機関のＥＧＲ制御方法として
は、例えば特開昭６３−１２９１５７号公報に開示され
ているような技術が有る。ここに開示された技術は噴射
時期の誤差に応じてＥＧＲを補正するものである。2. Description of the Related Art As a conventional EGR control method for an internal combustion engine, there is a technique disclosed in, for example, Japanese Patent Application Laid-Open No. 63-129157. The technology disclosed herein corrects EGR according to an error in injection timing.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、前述の
ような従来のＥＧＲ制御方法にあっては、ＥＧＲを補正
する割合はどの運転条件でも一律である。実際には負荷
により補正するゲインは、負荷に対して排気の感度が異
なるため、変える必要が有るが、この公知例では対応し
切れず、運転条件によってはＥＧＲが少な過ぎ、またあ
る条件では多過ぎるということがあり、排気を最良にす
るということが困難であるということが解った。However, in the above-described conventional EGR control method, the rate of EGR correction is uniform under any operating conditions. Actually, it is necessary to change the gain to be corrected depending on the load because the sensitivity of the exhaust gas to the load is different. However, this known example cannot cope with the problem. It turned out that it was too hard to optimize the exhaust.
【０００４】本発明は、このような従来の問題点に着目
してなされたもので、噴射時期誤差が生じたときには、
その誤差量と負荷に応じてＥＧＲを補正するものであ
る。[0004] The present invention has been made in view of such a conventional problem.
The EGR is corrected according to the error amount and the load.
【０００５】[0005]
【課題を解決するための手段】本発明は上述の課題を解
決するために、エンジン回転数やアクセル開度、水温等
エンジン運転状態を検知する運転状態検知手段１と、前
記運転状態検知手段１の出力から基本となる燃料噴射量
を演算する燃料噴射量演算手段２と、前記運転状態検知
手段１と前記燃料噴射量演算手段２の出力から目標の燃
料噴射時期を設定する目標噴射時期設定手段３と、実際
の燃料噴射時期を検知する実噴射時期検知手段４と、前
記運転状態検知手段１と前記燃料噴射量演算手段２の出
力から基本の目標ＥＧＲ率を演算する基本目標ＥＧＲ率
演算手段５と、前記燃料噴射量演算手段２と前記目標噴
射時期設定手段３と前記実噴射時期検知手段４の出力か
ら目標のＥＧＲ率の補正量を演算する目標ＥＧＲ率補正
量演算手段６と、前記基本目標ＥＧＲ率演算手段５と前
記目標ＥＧＲ率補正量演算手段６の出力から目標のＥＧ
Ｒ率を設定する目標ＥＧＲ率設定手段７と、前記目標Ｅ
ＧＲ率設定手段の出力からＥＧＲを制御するＥＧＲ制御
手段８と、を有し、前記目標ＥＧＲ率補正量演算手段６
のＥＧＲ率補正量設定時に前記目標噴射時期設定手段３
と前記実噴射時期検知手段４の出力の差で補正するとと
もに、前記燃料噴射量演算手段２の出力で噴射量が大き
いほど大きく補正することを特徴とする。 SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an operating state detecting means 1 for detecting an engine operating state such as an engine speed, an accelerator opening, a water temperature, and the like. A fuel injection amount calculating means 2 for calculating a basic fuel injection amount from the output of the engine; a target injection timing setting means for setting a target fuel injection timing from outputs of the operating state detecting means 1 and the fuel injection amount calculating means 2 3, an actual injection timing detecting means 4 for detecting an actual fuel injection timing, and a basic target EGR rate calculating means for calculating a basic target EGR rate from outputs of the operating state detecting means 1 and the fuel injection amount calculating means 2. 5, a target EGR rate correction amount calculating means 6 for calculating a target EGR rate correction amount from outputs of the fuel injection amount calculating means 2, the target injection timing setting means 3, and the actual injection timing detecting means 4, Serial basic target EGR rate calculating means 5 with the target of EG from the output of the target EGR ratio correction amount calculating means 6
A target EGR rate setting means 7 for setting an R rate;
And EGR control means 8 for controlling the EGR from the output of GR ratio setting means, has, the target EGR ratio correction amount calculating means 6
The target injection timing setting means 3 when the EGR rate correction amount is set.
And the difference between the output of the actual injection timing detection means 4 and
In addition, the output of the fuel injection amount calculating means 2 increases the injection amount.
It is characterized in that the correction is made as large as possible.
【０００６】[0006]
【０００７】[0007]
【０００８】また、本発明は、前記のＥＧＲ制御装置に
於て、下記の式で目標ＥＧＲ率を補正することを特徴と
する。
Ｋｅｇｒｉｔ＝（１−Ｒｅｇｄ）×ＫＥＩＴ＃×Ｑｆ／
ＱＦＢ＃
Ｋｅｇｒｉｔ：ＥＧＲ率補正係数
Ｒｅｇｄ ：噴射時期誤差に対する補正割合
ＫＥＩＴ＃ ：基準噴射量ＱＦＢ＃に於ける補正ゲイン
（定数）
Ｑｆ ：燃料噴射量
ＱＦＢ＃ ：基準噴射量（定数）Further, the present invention is characterized in that the above EGR control device corrects the target EGR rate by the following equation. Kegrit = (1-Regd) × KEIT # × Qf /
QFB # Kegrit: EGR rate correction coefficient Regd: Correction ratio for injection timing error KEIT #: Correction gain (constant) in reference injection amount QFB # Qf: Fuel injection amount QFB #: Reference injection amount (constant)
【０００９】[0009]
【発明の実施の形態】以下、本発明の実施の形態を図面
に基づいて詳細に説明する。図１は、本発明の構成をブ
ロック図で示したものである。まず構成を説明すると、
エンジン回転数やアクセル開度、水温等エンジン運転状
態を検知する運転状態検知手段１と、前記運転状態検知
手段１の出力から基本となる燃料噴射量を演算する燃料
噴射量演算手段２と、前記運転状態検知手段１と前記燃
料噴射量演算手段２の出力から目標の燃料噴射時期を設
定する目標噴射時期設定手段３と、実際の燃料噴射時期
を検知する実噴射時期検知手段４と、前記運転状態検知
手段１と前記燃料噴射量演算手段２の出力から基本の目
標ＥＧＲ率を演算する基本目標ＥＧＲ率演算手段５と、
前記燃料噴射量演算手段２と前記目標噴射時期設定手段
３と前記実噴射時期検知手段４の出力から目標のＥＧＲ
率の補正量を演算する目標ＥＧＲ率補正量演算手段６
と、前記基本目標ＥＧＲ率演算手段５と前記目標ＥＧＲ
率補正量演算手段６の出力から目標のＥＧＲ率を設定す
る目標ＥＧＲ率設定手段７と、前記目標ＥＧＲ率設定手
段７の出力からＥＧＲを制御するＥＧＲ制御手段８、か
らなる構成としている。Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the present invention. First, the configuration will be described.
An operating state detecting means 1 for detecting an engine operating state such as an engine speed, an accelerator opening, and a water temperature; a fuel injection amount calculating means 2 for calculating a basic fuel injection amount from an output of the operating state detecting means 1; Target injection timing setting means 3 for setting a target fuel injection timing from the outputs of the operating state detecting means 1 and the fuel injection amount calculating means 2, actual injection timing detecting means 4 for detecting the actual fuel injection timing, Basic target EGR rate calculating means 5 for calculating a basic target EGR rate from outputs of the state detecting means 1 and the fuel injection amount calculating means 2;
From the output of the fuel injection amount calculating means 2, the target injection timing setting means 3, and the actual injection timing detecting means 4, the target EGR
Target EGR rate correction amount calculating means 6 for calculating the correction amount of the rate
The basic target EGR rate calculating means 5 and the target EGR
A target EGR rate setting means 7 for setting a target EGR rate from an output of the rate correction amount calculating means 6 and an EGR control means 8 for controlling EGR from an output of the target EGR rate setting means 7 are provided.
【００１０】次に、上記構成のＥＧＲ制御装置の作用を
説明する。図２〜１７に、本発明の実施の形態のフロー
とそれに必要なテーブル、マップを示す。本発明である
目標ＥＧＲ率を噴射量誤差及び負荷で補正を変更するも
のについては図１１，図１５，図１６を用いて後から述
べる。Next, the operation of the EGR control device having the above configuration will be described. 2 to 17 show a flow of the embodiment of the present invention and tables and maps necessary for the flow. The correction of the target EGR rate by the injection amount error and the load according to the present invention will be described later with reference to FIGS.
【００１１】図２は、燃料噴射量を演算するフローであ
り、エンジンの回転に同期したタイミングで処理を行な
う。まず、ステップＳ１（以下Ｓ１のように略する）で
エンジン回転数Ｎｅを読み込み、Ｓ２でアクセル開度Ｃ
ｌを読み込む。Ｓ３でＮｅとＣｌから図３に示すような
マップから燃料噴射量を設定しＭｑｄｒｖとする。Ｓ４
で水温増量等の補正を行ない、燃料噴射量Ｑｓｏｌとし
て処理を終了する。FIG. 2 is a flowchart for calculating the fuel injection amount, and the processing is performed at a timing synchronized with the rotation of the engine. First, in step S1 (hereinafter abbreviated as S1), the engine speed Ne is read, and in S2, the accelerator opening C is read.
Read l. In S3, the fuel injection amount is set from Ne and Cl from a map as shown in FIG. 3 and is set to Mqdrv. S4
To correct the water temperature increase, etc., and terminate the processing with the fuel injection amount Qsol.
【００１２】図４は、燃料噴射時期を設定するフローで
ある。Ｓ１１でエンジン回転数Ｎｅ，Ｑｓｏｌを読み込
み、Ｓ１２で例えば図５に示すような噴射時期マップか
ら基本燃料噴射時期Ｍｉｔを演算する。Ｓ１３でＭｉｔ
に対し各種補正を行なって最終的な目標噴射時期Ｉｔｓ
ｏｌを設定して処理を終了する。FIG. 4 is a flowchart for setting the fuel injection timing. In S11, the engine speeds Ne and Qsol are read, and in S12, a basic fuel injection timing Mit is calculated from an injection timing map as shown in FIG. 5, for example. Mit in S13
To the final target injection timing Its
ol is set and the process is terminated.
【００１３】図６は、目標のＥＧＲ弁の開口面積を演算
するフローである。はじめに、目標のＥＧＲ量を演算す
る（Ｓ２１）。この方法については図７を用いて後で説
明する。Ｓ２２で吸気圧Ｐｍ、Ｓ２３で排気圧Ｐｅｘｈ
を読み込む。これらの圧力はエアフローメータの出力等
からの予測をしてもよいし専用のデバイスを設けてその
出力から得てもよい。Ｓ２４で図示するような式でＥＧ
Ｒ流速相当値Ｃｑｅを演算し、Ｓ２５で要求ＥＧＲ量Ｔ
ｑｅｋとＣｑｅを用い、図示するような式で開口面積Ａ
ｅｖを演算して、処理を終了する。なお、Ｓ２４，Ｓ２
５の式はベルヌーイの式を用いた理論式である。FIG. 6 is a flowchart for calculating the target opening area of the EGR valve. First, a target EGR amount is calculated (S21). This method will be described later with reference to FIG. S22: intake pressure Pm, S23: exhaust pressure Pexh
Read. These pressures may be predicted from the output of the air flow meter or the like, or may be obtained from the output by providing a dedicated device. EG is calculated by the equation as shown in S24.
An R flow velocity equivalent value Cqe is calculated, and in S25, the required EGR amount T
Using qek and Cqe, the opening area A
ev is calculated, and the process ends. Note that S24 and S2
Equation 5 is a theoretical equation using Bernoulli's equation.
【００１４】図７は、目標のＥＧＲ量を演算するフロー
であり、エンジン回転又はそれ相当に同期したタイミン
グで演算する。まず、Ｓ３１でコレクタ入口の一吸気当
りの吸入新気量Ｑａｃｎを演算する。この方法について
は図５を用いて後で説明する。Ｓ３２では目標のＥＧＲ
率Ｍｅｇｒを演算する。この方法については図９を用い
て後で説明する。Ｓ３３で図示するような式で一吸気当
りの目標のＥＧＲ量Ｍｑｅｃを演算する。Ｓ３４で中間
変数Ｒｑｅｃを図示するような式で演算する。Ｓ３５で
進み処理の補正ゲインＧＫＱＥＣ及びＲｑｅｃ，Ｍｑｅ
ｃを用いて、図示するような式で進み補正処理を行な
い、その結果をＴｑｅｃとする。この式は通常の進み処
理を簡易化したものである。Ｓ３６でＳ３５で求められ
たＴｑｅｃは一吸気当りの要求ＥＧＲ量に対し単位時間
当りの要求量に変換してＴｑｅｋとして処理を終了す
る。FIG. 7 is a flowchart for calculating the target EGR amount, which is calculated at a timing synchronized with the engine rotation or equivalent. First, in S31, a new intake air amount Qacn per intake air of the collector inlet is calculated. This method will be described later with reference to FIG. In S32, the target EGR
Calculate the rate Megr. This method will be described later with reference to FIG. In step S33, a target EGR amount Mqec per intake air is calculated by an equation as shown in the figure. In S34, the intermediate variable Rqec is calculated by an equation as shown. In S35, the correction gains GKQEC and Rqec, Mqe of the advance processing
Using c, an advance correction process is performed by an equation as shown in the figure, and the result is set as Tqec. This equation simplifies the normal advance processing. In step S36, the Tqec obtained in step S35 is converted into the required amount per unit time with respect to the required EGR amount per intake air, and the process ends as Tqek.
【００１５】図８は、コレクタ入口の一吸気当りの吸入
新気量の演算フローであり、エンジン回転に同期したタ
イミングで演算する。まず、エンジン回転数Ｎｅを読み
込み（Ｓ４１）、Ｓ４２で図示するような式で吸入空気
量Ｑａｓ０から一吸気当りの新気量Ｑａｃ０を演算す
る。吸入空気量Ｑａｓ０については図９，図１０を用い
て後で説明する。Ｓ４３で所定回前Ｌに演算されたＱａ
ｃ０をＱａｃｎとして処理を終了する。この所定回前の
Ｑａｓ０をコレクタ入口の値とするのは、吸入空気量検
知手段の測定位置からコレクタ入口までの輸送遅れが存
在するためである。図９は、吸入空気量Ｑａｓ０を演算
するフローであり、４ｍｓｅｃ毎等の時間同期で演算さ
れる。Ｓ５１でエアフローメータ等の吸入空気量を検知
する手段の出力電圧を読み込み、Ｓ５２で図１０に示す
ような検知手段を特性テーブル（電圧−吸気量変換テー
ブル）を用いて変換し、Ｓ５３で平均化処理を行なって
Ｑａｓ０として、処理を終了する。FIG. 8 is a flow chart for calculating a fresh intake air amount per intake air at the collector inlet, which is calculated at a timing synchronized with the engine rotation. First, the engine speed Ne is read (S41), and a new air amount Qac0 per intake air is calculated from the intake air amount Qas0 by an equation as shown in S42. The intake air amount Qas0 will be described later with reference to FIGS. Qa calculated L before predetermined time in S43
The process ends with c0 as Qacn. The reason why Qas0 before this predetermined time is used as the value at the collector inlet is that there is a transport delay from the measurement position of the intake air amount detecting means to the collector inlet. FIG. 9 is a flowchart for calculating the intake air amount Qas0, which is calculated in time synchronization such as every 4 msec. In step S51, the output voltage of the means for detecting the amount of intake air, such as an air flow meter, is read. In step S52, the detecting means shown in FIG. The process is performed, and the process ends as Qas0.
【００１６】図１１は、目標ＥＧＲ率Ｍｅｇｒを演算す
るフローで、エンジン回転に同期したタイミングで演算
する。はじめに、エンジン回転数Ｎｅ、燃料噴射量Ｑｓ
ｏｌ、機関冷却水温Ｔｗ、目標噴射時期Ｉｔｓｏｌ、実
噴射時期Ｉｔｉｓｔを読み込む（Ｓ６１）。実噴射時期
Ｉｔｉｓｔは噴射ノズルに設けた針弁リフトセンサの出
力などを用いて、そのリフト開始時点または開始時点と
終了時点の平均値等を検知して得られるものである。FIG. 11 is a flowchart for calculating the target EGR rate Megr, which is calculated at a timing synchronized with the engine rotation. First, the engine speed Ne and the fuel injection amount Qs
ol, the engine cooling water temperature Tw, the target injection timing Itsol, and the actual injection timing Itist (S61). The actual injection timing Itist is obtained by detecting the lift start time or the average value of the start time and end time using the output of a needle valve lift sensor provided in the injection nozzle.
【００１７】Ｓ６２でＮｅとＱｓｏｌから図１２に示す
ようなマップを検索し、基本目標ＥＧＲ率Ｍｅｇｒｂを
演算する。Ｓ６３でＴｗから例えば図１３に示すよう
な、機関水温に対して目標のＥＧＲ率を補正する係数テ
ーブルを検索してＫｅｇｒ＿ｔｗとする。Ｓ６４で噴射
時期誤差補正係数Ｋｅｇｒｉｔを演算する。演算方法は
図１５，図１６を用いて後から説明する。Ｓ６５で図示
するような式で目標ＥＧＲ率Ｍｅｇｒを演算する。Ｓ６
６でエンジンの状態が完爆状態か否かを判定する。この
方法は図１４を用いて後で説明する。Ｓ６６で完爆と判
定されたらそのまま終了し、完爆でないと判定されたと
きには目標ＥＧＲ率Ｍｅｇｒを０として（Ｓ６７）処理
を終了する。In S62, a map as shown in FIG. 12 is searched from Ne and Qsol, and a basic target EGR rate Megrb is calculated. In S63, a coefficient table for correcting the target EGR rate with respect to the engine coolant temperature, for example, as shown in FIG. 13, is retrieved from Tw and is set as Kegr_tw. In S64, an injection timing error correction coefficient Kegrit is calculated. The calculation method will be described later with reference to FIGS. In step S65, the target EGR rate Megr is calculated by an equation as shown in the figure. S6
At 6, it is determined whether or not the state of the engine is a complete explosion state. This method will be described later with reference to FIG. If it is determined in S66 that the explosion is complete, the process ends as it is. If it is determined that the explosion is not complete, the target EGR rate Megr is set to 0 (S67) and the process ends.
【００１８】図１４は、エンジンの完爆を判定するフロ
ーで、１０ｍｓｅｃ等時間に同期したタイミングで演算
される。まず、エンジン回転数Ｎｅを読み込み（Ｓ７
１）、Ｓ７２で完爆判定スライスレベルＮＲＰＭＫと比
較し、Ｎｅの方が大のときにはＳ７３へ進む。Ｓ７３で
回転による完爆判定後のカウンタＴｍｒｋｂと所定時間
ＴＭＲＫＢＰと比較し、大ならＳ７４へ進み、完爆とし
て処理を終了する。Ｓ７２でＮｅが小のときにはＳ７６
へ進み、Ｔｍｒｋｂをクリアし、完爆でないとして処理
を終了する。Ｓ７３でＴｍｒｋｂが小のときにはＳ７５
へ進み、ＴｍｒｋｂをインクリメントしてＳ７７へ進
み、完爆でないとして処理を終了する。当処理ではエン
ジン回転数が所定以上（例えば４００回転以上）とな
り、所定時間経過したときに完爆と判定するという処理
を行なっている。FIG. 14 shows a flow for judging a complete explosion of the engine, which is calculated at a timing synchronized with an equal time of 10 msec. First, the engine speed Ne is read (S7).
1) In S72, the slice level is compared with the complete explosion determination slice level NRPMK. If Ne is larger, the process proceeds to S73. In S73, the counter Tmrkb after the complete explosion determination by rotation is compared with the predetermined time TRMKBP. If it is larger, the process proceeds to S74, and the process is terminated as a complete explosion. If Ne is small in S72, S76
Then, Tmrkb is cleared, and it is determined that the explosion is not complete, and the process ends. If Tmrkb is small in S73, S75
The program proceeds to S77, where Tmrkb is incremented, and the procedure proceeds to S77. In this process, a process is performed in which the engine speed is equal to or higher than a predetermined value (for example, 400 rotations or more), and when a predetermined time has elapsed, it is determined that a complete explosion has occurred.
【００１９】図１５は、噴射時期誤差補正係数Ｋｅｇｒ
ｉｔを演算するフローである。まず、Ｓ８１で実噴射時
期Ｉｔｉｓｔと目標噴射時期Ｉｔｓｏｌとの差Ｄｉｔを
演算する。Ｓ８２で噴射時期誤差に対する補正割合Ｒｅ
ｇｄを、例えば図１６に示すようなテーブルから検索し
て設定する。Ｓ８３でＲｅｇｄ、燃料噴射量Ｑｓｏｌか
ら、図示するような式で目標ＥＧＲ率噴射時期誤差補正
係数Ｋｅｇｒｉｔを演算する。Ｓ８４でＫｅｇｒｉｔを
０から１までの値に制限して処理を終了する。この制限
は、噴射量が増えて補正ゲインが増加しても基本目標値
を越えないようにするためである。FIG. 15 shows an injection timing error correction coefficient Kegr.
It is a flow for calculating it. First, in S81, a difference Dit between the actual injection timing Itist and the target injection timing Itsol is calculated. In S82, the correction ratio Re for the injection timing error
gd is retrieved and set from, for example, a table as shown in FIG. In step S83, a target EGR rate injection timing error correction coefficient Kegrit is calculated from Regd and the fuel injection amount Qsol by an equation as shown in the figure. In step S84, Kegrit is limited to a value from 0 to 1, and the process ends. This restriction is to prevent the correction target gain from exceeding the basic target value even when the injection amount increases and the correction gain increases.
【００２０】[0020]
【発明の効果】以上説明してきたように、噴射時期の目
標値と実際値のずれに対してＥＧＲを補正する際、噴射
量等負荷によりその補正割合を変化させることにより、
負荷に対する補正感度が変えられるため、噴射時期誤差
量に対して忠実に要求のＥＧＲを供給することが可能と
なる。また、本発明は、要求ＥＧＲ量のレンジ、及びＥ
ＧＲや噴射時期に対して排気エミッションの感度が高い
システムに対して特に有効である。As described above, when the EGR is corrected for the difference between the target value and the actual value of the injection timing, the correction ratio is changed by the load such as the injection amount.
Since the correction sensitivity to the load can be changed, the required EGR can be supplied faithfully with respect to the injection timing error amount. Further, the present invention provides a range of the required EGR amount,
This is particularly effective for a system in which the sensitivity of exhaust emission to GR or injection timing is high.
【図１】本発明のブロック構成図である。FIG. 1 is a block diagram of the present invention.
【図２】燃料噴射量演算フローである。FIG. 2 is a fuel injection amount calculation flow.
【図３】基本燃料噴射量マップである。FIG. 3 is a basic fuel injection amount map.
【図４】目標噴射時期設定フローである。FIG. 4 is a flowchart for setting a target injection timing.
【図５】噴射時期マップ例である。FIG. 5 is an example of an injection timing map.
【図６】目標ＥＧＲ弁開口面積演算フローである。FIG. 6 is a flowchart for calculating a target EGR valve opening area.
【図７】目標ＥＧＲ量演算フローである。FIG. 7 is a flowchart for calculating a target EGR amount.
【図８】シリンダ吸入空気量演算フローである。FIG. 8 is a cylinder intake air amount calculation flow.
【図９】吸入空気量検知フローである。FIG. 9 is an intake air amount detection flow.
【図１０】電圧−流量変換テーブルである。FIG. 10 is a voltage-flow rate conversion table.
【図１１】目標ＥＧＲ率演算フローである。FIG. 11 is a flowchart for calculating a target EGR rate.
【図１２】目標ＥＧＲ率マップ（例）である。FIG. 12 is a target EGR rate map (example).
【図１３】目標ＥＧＲ率水温補正係数テーブル（例）で
ある。FIG. 13 is a target EGR rate water temperature correction coefficient table (example).
【図１４】完爆判定フローである。FIG. 14 is a complete explosion determination flow.
【図１５】噴射時期誤差ＥＧＲ率補正係数演算フローで
ある。FIG. 15 is a flowchart for calculating an injection timing error EGR rate correction coefficient.
【図１６】噴射時期誤差補正割合テーブル例である。FIG. 16 is an example of an injection timing error correction ratio table.
【図１７】ＥＧＲ弁の開口面積から制御装置へ送る信号
への変換を行なうテーブルの設定例を示す図である。FIG. 17 is a diagram showing a setting example of a table for converting an opening area of an EGR valve into a signal to be sent to a control device.
１ 運転状態検知手段 ２ 燃料噴射量演算手段 ３ 目標噴射時期設定手段 ４ 実噴射時期検知手段 ５ 基本目標ＥＧＲ率演算手段 ６ 目標ＥＧＲ率補正量演算手段 ７ 目標ＥＧＲ率設定手段 ８ ＥＧＲ制御手段 1 Operating state detection means 2 Fuel injection amount calculation means 3 Target injection timing setting means 4 Actual injection timing detection means 5 Basic target EGR rate calculation means 6 Target EGR rate correction amount calculation means 7 Target EGR rate setting means 8 EGR control means
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) F02M 25/07 550 F02M 25/07 570 F02D 21/08 301 F02D 41/02 385 F02D 41/40 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 7 , DB name) F02M 25/07 550 F02M 25/07 570 F02D 21/08 301 F02D 41/02 385 F02D 41/40
Claims (2)
エンジン運転状態を検知する運転状態検知手段と、 前記運転状態検知手段の出力から基本となる燃料噴射量
を演算する燃料噴射量演算手段と、 前記運転状態検知手段と前記燃料噴射量演算手段の出力
から目標の燃料噴射時期を設定する目標噴射時期設定手
段と、 実際の燃料噴射時期を検知する実噴射時期検知手段と、 前記運転状態検知手段と前記燃料噴射量演算手段の出力
から基本の目標ＥＧＲ率を演算する基本目標ＥＧＲ率演
算手段と、 前記燃料噴射量演算手段と前記目標噴射時期設定手段と
前記実噴射時期検知手段の出力から目標のＥＧＲ率の補
正量を演算する目標ＥＧＲ率補正量演算手段と、 前記基本目標ＥＧＲ率演算手段と前記目標ＥＧＲ率補正
量演算手段の出力から目標のＥＧＲ率を設定する目標Ｅ
ＧＲ率設定手段と、 前記目標ＥＧＲ率設定手段の出力からＥＧＲを制御する
ＥＧＲ制御手段と、を有し、 前記目標ＥＧＲ率補正量演算手段のＥＧＲ率補正量設定
時に前記目標噴射時期設定手段と前記実噴射時期検知手
段の出力の差で補正するとともに、前記燃料噴射量演算
手段の出力で噴射量が大きいほど大きく補正することを
特徴とする 内燃機関のＥＧＲ制御装置。1. An operating state detecting means for detecting an engine operating state such as an engine speed, an accelerator opening, a water temperature, and a fuel injection amount calculating means for calculating a basic fuel injection amount from an output of the operating state detecting means. A target injection timing setting unit for setting a target fuel injection timing from an output of the operating state detecting unit and the fuel injection amount calculating unit; an actual injection timing detecting unit for detecting an actual fuel injection timing; Means and a basic target EGR rate calculating means for calculating a basic target EGR rate from the output of the fuel injection amount calculating means; and an output from the fuel injection amount calculating means, the target injection timing setting means and the actual injection timing detecting means. A target EGR rate correction amount calculating means for calculating a correction amount of a target EGR rate; a target EGR rate correction amount calculating means for calculating a target EGR rate correction amount calculating means; Target E for setting EGR rate
Has a GR ratio setting means, and EGR control means for controlling the EGR from an output of the target EGR rate setting means, the, EGR rate correction amount setting of the target EGR ratio correction amount calculating means
Sometimes the target injection timing setting means and the actual injection timing detection means
Correction based on the difference between the output of the stages and the calculation of the fuel injection amount.
The larger the injection quantity is, the greater the correction will be with the output of the means.
An EGR control device for an internal combustion engine.
て、 下記の式で目標ＥＧＲ率を補正することを特徴とする内
燃機関のＥＧＲ制御装置。 Ｋｅｇｒｉｔ＝（１−Ｒｅｇｄ）×ＫＥＩＴ＃×Ｑｆ／ＱＦＢ＃ Ｋｅｇｒｉｔ ：ＥＧＲ率補正係数 Ｒｅｇｄ ：噴射時期誤差に対する補正割合 ＫＥＩＴ＃ ：基準噴射量ＱＦＢ＃に於ける補正ゲイン（定数） Ｑｆ ：燃料噴射量 ＱＦＢ＃ ：基準噴射量（定数）2. An EGR control device for an internal combustion engine according to claim 1, wherein the target EGR rate is corrected by the following equation. Kegrit = (1−Regd) × KEIT # × Qf / QFB # Kegrit: EGR rate correction coefficient Regd: Correction ratio for injection timing error KEIT #: Correction gain (constant) in reference injection amount QFB # Qf: Fuel injection amount QFB #: Reference injection amount (constant)
Priority Applications (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25724196A JP3538825B2 (en) | 1996-09-30 | 1996-09-30 | EGR control device for internal combustion engine |
| DE19723210A DE19723210B4 (en) | 1996-06-03 | 1997-06-03 | Control apparatus for exhaust gas recirculation in internal combustion engine - calculates target EGR rate according to standard rate and required amount of adjustment which is determined according to standard injection volume, target and actual injection timing |
| DE19758641A DE19758641B4 (en) | 1996-06-03 | 1997-06-03 | Control apparatus for exhaust gas recirculation in internal combustion engine - calculates target EGR rate according to standard rate and required amount of adjustment which is determined according to standard injection volume, target and actual injection timing |
| GB9825391A GB2329040B (en) | 1996-06-03 | 1997-06-03 | Apparatus for estimating pressure in intake system and exhaust system of internal combustion engine |
| GB9711483A GB2313927B (en) | 1996-06-03 | 1997-06-03 | EGR control apparatus for internal combustion engine |
| US08/867,980 US6012431A (en) | 1996-06-03 | 1997-06-03 | Control apparatus for internal combustion engine and estimation apparatus for estimating pressure in intake and discharge system of internal combustion engine |
| US09/427,004 US6167342A (en) | 1996-06-03 | 1999-10-26 | Control apparatus for internal combustion engine and estimation apparatus for estimating pressure in intake and discharge system of internal combustion engine |
| US09/699,342 US6298299B1 (en) | 1996-06-03 | 2000-10-31 | Control apparatus for internal combustion engine and estimation apparatus for estimating pressure in intake and discharge system of internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25724196A JP3538825B2 (en) | 1996-09-30 | 1996-09-30 | EGR control device for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10103164A JPH10103164A (en) | 1998-04-21 |
| JP3538825B2 true JP3538825B2 (en) | 2004-06-14 |
Family
ID=17303655
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25724196A Expired - Lifetime JP3538825B2 (en) | 1996-06-03 | 1996-09-30 | EGR control device for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3538825B2 (en) |
-
1996
- 1996-09-30 JP JP25724196A patent/JP3538825B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10103164A (en) | 1998-04-21 |
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