JPH0799102B2 - Mixed fuel supply system for internal combustion engine - Google Patents
Mixed fuel supply system for internal combustion engineInfo
- Publication number
- JPH0799102B2 JPH0799102B2 JP24918389A JP24918389A JPH0799102B2 JP H0799102 B2 JPH0799102 B2 JP H0799102B2 JP 24918389 A JP24918389 A JP 24918389A JP 24918389 A JP24918389 A JP 24918389A JP H0799102 B2 JPH0799102 B2 JP H0799102B2
- Authority
- JP
- Japan
- Prior art keywords
- supply amount
- fuel
- basic
- maximum
- fuel supply
- 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
Landscapes
- Output Control And Ontrol Of Special Type Engine (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Description
【発明の詳細な説明】 〈産業上の利用分野〉 本発明は、メタノール等のアルコールがガソリンに混入
される混合燃料を機関に混合する燃料供給装置に関す
る。TECHNICAL FIELD The present invention relates to a fuel supply device for mixing an engine with a mixed fuel in which alcohol such as methanol is mixed in gasoline.
〈従来の技術〉 この種の混合燃料供給装置の従来例として、以下のよう
なものがある。<Prior Art> The following is a conventional example of this type of mixed fuel supply device.
すなわち、エアフローメータにより検出された吸入空気
流量Ｑと機関回転速度Ｎとから基本噴射量TP＝Ｋ×Q/N
（Ｋは定数）を演算する。そして、前記基本噴射量T
Pと、主として水温に応じた各種増量補正係数COEFと、
酸素センサの検出値に基づく空燃比フィードバック補正
係数αと、アルコール濃度センサの検出値に基づくアル
コール濃度補正係数KMETと、バッテリ電圧の電圧補正分
TSと、から燃料噴射量Ti＝TP×COEF×KMET×α＋TSを演
算する。そして、例えば、機関の1/2回転毎に点火信号
等に同期して燃料噴射弁に対し前記燃料噴射量Tiに対応
するパルス幅の噴射パルス信号を出力し機関に燃料を供
給する。That is, the basic injection amount T P = K × Q / N from the intake air flow rate Q detected by the air flow meter and the engine rotation speed N.
(K is a constant) is calculated. Then, the basic injection amount T
P and various increase correction factors COEF mainly according to the water temperature,
The air-fuel ratio feedback correction coefficient α based on the detection value of the oxygen sensor, the alcohol concentration correction coefficient K MET based on the detection value of the alcohol concentration sensor, and the voltage correction amount of the battery voltage.
From T S , the fuel injection amount T i = T P × COEF × K MET × α + T S is calculated. Then, for example, an injection pulse signal having a pulse width corresponding to the fuel injection amount T i is output to the fuel injection valve in synchronization with an ignition signal or the like every 1/2 revolution of the engine to supply fuel to the engine.
ところで、高負荷運転領域での吸気吹返しによる検出エ
ラーを防止したり、加速運転後期のエアフローメータの
オーバシュート分をカットするために、機関回転速度に
対応する最大基本噴射量TPMAXを設定し、前記演算され
た基本噴射量TPが前記TPMAXを上回ったときに前記TPMAX
を選択し、このTPMAXに基づいて燃料噴射量Tiを演算す
るようになっている。By the way, in order to prevent detection errors due to intake air blowback in the high load operation region and to cut off the overshoot of the air flow meter in the latter stage of acceleration operation, set the maximum basic injection amount T PMAX corresponding to the engine speed. , When the calculated basic injection amount T P exceeds the T PMAX , the T PMAX
Is selected, and the fuel injection amount T i is calculated based on this T PMAX .
〈発明が解決しようとする課題〉 しかしながら、このような従来の混合燃料供給装置にお
いては、前記最大基本噴射量TPMAXを機関回転速度に依
存させて変化させるようにしているので、以下の不具合
があった。<Problems to be Solved by the Invention> However, in such a conventional mixed fuel supply device, since the maximum basic injection amount T PMAX is changed depending on the engine speed, the following problems occur. there were.
すなわち、アルコール濃度が高いほど燃料蒸発が大きく
なって吸入効率が低下して吸入空気流量が低下するの
で、前記基本噴射量も低下する。また、アルコール濃度
による気化潜熱の相違によって吸気の冷却度が相違し、
これによっても吸入効率が変化する。このため、前記最
大基本噴射量TPMAXを機関回転速度のみに依存させる
と、加速運転時或いは高負荷運転時に最適な空燃比を確
保できず運転性が悪化するという不具合がある。That is, as the alcohol concentration increases, the fuel evaporation increases, the intake efficiency decreases, and the intake air flow rate decreases, so the basic injection amount also decreases. In addition, the degree of cooling of intake air differs due to the difference in latent heat of vaporization due to alcohol concentration,
This also changes the inhalation efficiency. Therefore, if the maximum basic injection amount T PMAX is made to depend only on the engine rotation speed, there is a problem that the optimum air-fuel ratio cannot be secured during acceleration operation or high load operation, and the drivability deteriorates.
〈課題を解決するための手段〉 このため、本発明は第１図に示すように二種の燃料を混
合した混合燃料を機関に供給するものであって、機関の
運転状態に基づいて基本供給量を設定する基本供給量設
定手段Ａと、前記混合燃料中における一方の燃料濃度を
検出する濃度検出手段Ｂと、検出された燃料濃度に基づ
いて前記基本供給量の最大を規制する最大基本供給量を
設定する最大基本供給量設定手段Ｃと、前記設定された
基本供給量が前記最大基本供給量以上のときに前記最大
基本供給量を選択し、それ以外のときには前記基本供給
量を選択する選択手段Ｄと、選択された基本供給量若し
くは最大基本供給量に応じて燃料供給量を設定する燃料
供給量設定手段Ｅと、設定された燃料供給量に基づいて
燃料供給手段Ｆを、駆動制御する駆動制御手段Ｇと、を
備えるようにした。<Means for Solving the Problems> Therefore, according to the present invention, as shown in FIG. 1, a mixed fuel in which two kinds of fuels are mixed is supplied to the engine, and the basic supply is performed based on the operating state of the engine. Basic supply amount setting means A for setting the amount, concentration detecting means B for detecting one fuel concentration in the mixed fuel, and maximum basic supply for limiting the maximum of the basic supply amount based on the detected fuel concentration. A maximum basic supply amount setting means C for setting the amount, and selects the maximum basic supply amount when the set basic supply amount is equal to or more than the maximum basic supply amount, and selects the basic supply amount otherwise. Drive control of the selection unit D, the fuel supply amount setting unit E that sets the fuel supply amount according to the selected basic supply amount or the maximum basic supply amount, and the fuel supply unit F based on the set fuel supply amount Drive control Means G and are provided.
〈作用〉 このようにして、燃料濃度に応じて最大基本供給量を変
化させて設定することにより、燃料濃度が変化しても最
適な空燃比を確保できるようにした。<Operation> In this way, by changing and setting the maximum basic supply amount according to the fuel concentration, the optimum air-fuel ratio can be secured even if the fuel concentration changes.
〈実施例〉 以下に、本発明の一実施例を第２図及び第３図に基づい
て説明する。<Embodiment> An embodiment of the present invention will be described below with reference to FIGS. 2 and 3.
第２図において、マイクロコンピュータ等からなる制御
装置１にはエアフローメータ２からの吸入空気流量Ｑ検
査信号と、回転速度センサ３からの回転速度Ｎ検出信号
と、水温センサ４からの水温検出信号と、濃度検出手段
としてのアルコール濃度センサ５からのアルコール濃度
検出信号と、酸素センサ６からの排気中の酸素濃度検出
信号と、が入力されている。In FIG. 2, the control device 1 including a microcomputer includes an intake air flow rate Q inspection signal from the air flow meter 2, a rotation speed N detection signal from the rotation speed sensor 3, and a water temperature detection signal from the water temperature sensor 4. The alcohol concentration detection signal from the alcohol concentration sensor 5 as the concentration detection means and the oxygen concentration detection signal in the exhaust gas from the oxygen sensor 6 are input.
制御装置１は第３図のフローチャートに従って作動し、
燃料供給手段としての燃料噴射弁７に駆動回路８を介し
て噴射パルス信号を出力することによりアルコール燃料
を機関に供給するようになっている。The control device 1 operates according to the flowchart of FIG.
An alcohol fuel is supplied to the engine by outputting an injection pulse signal to a fuel injection valve 7 as a fuel supply means via a drive circuit 8.
ここでは、制御装置１が基本供給量設定手段と最大基本
供給量設定手段と選択手段と燃料供給量設定手段とを構
成する。また、制御装置１と駆動回路８とが駆動制御手
段を構成する。Here, the control device 1 constitutes a basic supply amount setting means, a maximum basic supply amount setting means, a selecting means, and a fuel supply amount setting means. Further, the control device 1 and the drive circuit 8 constitute drive control means.
次に、作用を第３図のフローチャートに従って説明す
る。Next, the operation will be described with reference to the flowchart of FIG.
S1では、エアフローメータ２、回転速度センサ３等から
の各種信号を読込む。At S1, various signals from the air flow meter 2, the rotation speed sensor 3, etc. are read.
S2では、エアフローメータ２により検出された吸入空気
流量Ｑと回転速度センサ３により検出された機関回転速
度Ｎとから基本供給量としての基本噴射量TP（KQ/N:Kは
定数）を演算する。In S2, a basic injection amount T P (KQ / N: K is a constant) as a basic supply amount is calculated from the intake air flow rate Q detected by the air flow meter 2 and the engine rotation speed N detected by the rotation speed sensor 3. To do.
S3では、検出された機関回転速度とアルコール濃度（メ
タノール濃度）とに基づいてマップから最大基本供給量
としての最大基本噴射量TPMAXを検索する。この最大基
本噴射量TPMAXはアルコール濃度が高いほど小さくなる
ように設定されている。In S3, the maximum basic injection amount T PMAX as the maximum basic supply amount is searched from the map based on the detected engine speed and alcohol concentration (methanol concentration). This maximum basic injection amount T PMAX is set to decrease as the alcohol concentration increases.
S4では、検索された最大基本噴射量TPMAXを、検出され
た冷却水温に応じて補正する。具体的には、冷却水温が
高くなるに従って最大基本噴射量TPMAXが小さくなるよ
うに補正する。尚、吸気温度に応じて最大基本噴射量T
PMAXを補正してもよい。In S4, the retrieved maximum basic injection amount T PMAX is corrected according to the detected cooling water temperature. Specifically, the maximum basic injection amount T PMAX is corrected to decrease as the cooling water temperature increases. In addition, the maximum basic injection amount T depending on the intake air temperature
You may correct PMAX .
S5では、S2にて演算された基本噴射量TPがS4にて補正さ
れた最大基本噴射量TPMAXを超えているか否かを判定
し、YESのときにはS6に進みNOのときにはS7に進む。In S5, it is determined whether the basic injection amount T P calculated in S2 exceeds the maximum basic injection amount T PMAX corrected in S4. If YES, the process proceeds to S6, and if NO, the process proceeds to S7.
S6ではS4にて補正された最大基本噴射量TPMAXを選択
し、S7ではS2にて演算された基本噴射量TPを選択する。In S6, the maximum basic injection amount T PMAX corrected in S4 is selected, and in S7, the basic injection amount T P calculated in S2 is selected.
S8では、選択された最大基本噴射量TPMAX若しくは基本
噴射量TPに基づいて燃料噴射量Tiを次式により演算す
る。In S8, the fuel injection amount T i is calculated by the following formula based on the selected maximum basic injection amount T PMAX or basic injection amount T P.
Ti＝TP（又はTPMAX）×COEF×α×TS COEFは水温等に基づく各種補正係数、αは酸素センサ６
の検出信号に基づく空燃比フィードバック補正係数、K
METはアルコール濃度センサ５の検出値に基づくアルコ
ール濃度補生係数、TSはバッテリ電圧による補正係数で
ある。T i = T P (or T PMAX ) × COEF × α × T S COEF is various correction factors based on water temperature, α is oxygen sensor 6
Air-fuel ratio feedback correction coefficient, K based on the detection signal of
MET is an alcohol concentration complementation coefficient based on the detection value of the alcohol concentration sensor 5, and T S is a correction coefficient based on the battery voltage.
以上説明したように、最大基本噴射量TPMAXをアルコー
ル濃度に応じて変化させて設定するようにしたので、ア
ルコール濃度に応じて吸入効率が変化してもこれに対応
した最大基本噴射量TPMAXを確保できるため、加速運転
後期或いは高負荷運転時の空燃比を最適に制御でき、も
って運転性を向上できる。また、最大基本噴射量TPMAX
を冷却水温（又は吸気温）に応じて補正するようにした
ので、空気密度変化に対応する最大基本噴射量TPMAXを
確保でき、さらに空燃比を最適に制御できる。As described above, since the maximum basic injection amount T PMAX is set by changing it according to the alcohol concentration, even if the suction efficiency changes according to the alcohol concentration, the maximum basic injection amount T PMAX corresponding to this Therefore, it is possible to optimally control the air-fuel ratio at the latter stage of acceleration operation or at the time of high load operation, thereby improving drivability. Also, the maximum basic injection amount T PMAX
Is corrected according to the cooling water temperature (or the intake air temperature), the maximum basic injection amount T PMAX corresponding to the change in the air density can be secured, and the air-fuel ratio can be optimally controlled.
尚、機関回転速度に対応して設定された最大基本噴射量
TPMAXを、アルコール濃度に応じた補正係数と冷却水温
に応じた補正係数とにより補正させてもよい。The maximum basic injection amount set according to the engine speed
T PMAX may be corrected by a correction coefficient according to the alcohol concentration and a correction coefficient according to the cooling water temperature.
〈発明の効果〉 本発明は、以上説明したように、基本供給量の最大値を
規制する最大基本供給量を燃料濃度に応じて設定するよ
うにしたので、アルコール濃度によって吸入効率が変化
しても加速運転後期或いは高負荷運転時に最適な空燃比
を確保でき運転性を向上できる。<Effects of the Invention> As described above, according to the present invention, since the maximum basic supply amount that regulates the maximum value of the basic supply amount is set according to the fuel concentration, the intake efficiency changes depending on the alcohol concentration. Also, the optimum air-fuel ratio can be secured during the latter period of acceleration operation or during high load operation, and drivability can be improved.
第１図は本発明のクレーム対応図、第２図は本発明の一
実施例を示す構成図、第３図は同上のフローチャートで
ある。 １……制御装置、２……エアフローメータ、３……回転
速度センサ、４……水温センサ、５……アルコール濃度
センサ、７……燃料噴射弁、８……駆動回路FIG. 1 is a diagram corresponding to the claims of the present invention, FIG. 2 is a configuration diagram showing an embodiment of the present invention, and FIG. 3 is a flowchart of the same. 1 ... Control device, 2 ... Air flow meter, 3 ... Rotation speed sensor, 4 ... Water temperature sensor, 5 ... Alcohol concentration sensor, 7 ... Fuel injection valve, 8 ... Drive circuit
Claims (1)
給するものであって、機関の運転状態に基づいて基本供
給量を設定する基本供給量設定手段と、前記混合燃料中
における一方の燃料濃度を検出する濃度検出手段と、検
出された燃料濃度に基づいて前記基本供給量の最大を規
制する最大基本供給量を設定する最大基本供給量設定手
段と、前記設定された基本供給量が前記最大基本供給量
以上のときに前記最大基本供給量を選択し、それ以外の
ときには前記基本供給量を選択する選択手段と、選択さ
れた基本供給量若しくは最大基本供給量に基づいて燃料
供給量を設定する燃料供給量設定手段と、設定された燃
料供給量に基づいて燃料供給手段を駆動制御する駆動制
御手段と、を備えたことを特徴とする内燃機関の混合燃
料供給装置。1. A basic fuel supply amount setting means for supplying a mixed fuel, which is a mixture of two kinds of fuel, to an engine, and a basic fuel supply amount setting means for setting a basic fuel supply amount based on an operating state of the engine; Concentration detecting means for detecting the fuel concentration of, the maximum basic supply amount setting means for setting the maximum basic supply amount for limiting the maximum of the basic supply amount based on the detected fuel concentration, and the set basic supply amount Is greater than or equal to the maximum basic supply amount, select means for selecting the maximum basic supply amount, otherwise select the basic supply amount, and the fuel supply based on the selected basic supply amount or the maximum basic supply amount. A mixed fuel supply device for an internal combustion engine, comprising: a fuel supply amount setting means for setting an amount; and a drive control means for drivingly controlling the fuel supply means based on the set fuel supply amount.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24918389A JPH0799102B2 (en) | 1989-09-27 | 1989-09-27 | Mixed fuel supply system for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24918389A JPH0799102B2 (en) | 1989-09-27 | 1989-09-27 | Mixed fuel supply system for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03111635A JPH03111635A (en) | 1991-05-13 |
| JPH0799102B2 true JPH0799102B2 (en) | 1995-10-25 |
Family
ID=17189136
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24918389A Expired - Lifetime JPH0799102B2 (en) | 1989-09-27 | 1989-09-27 | Mixed fuel supply system for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0799102B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4654952B2 (en) * | 2006-03-17 | 2011-03-23 | トヨタ自動車株式会社 | Output control device for internal combustion engine |
| JP4315196B2 (en) | 2006-12-21 | 2009-08-19 | トヨタ自動車株式会社 | Control device for internal combustion engine |
-
1989
- 1989-09-27 JP JP24918389A patent/JPH0799102B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03111635A (en) | 1991-05-13 |
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