JP2003120439A - Evaporation fuel processing device for internal combustion engine - Google Patents
Evaporation fuel processing device for internal combustion engineInfo
- Publication number
- JP2003120439A JP2003120439A JP2001313643A JP2001313643A JP2003120439A JP 2003120439 A JP2003120439 A JP 2003120439A JP 2001313643 A JP2001313643 A JP 2001313643A JP 2001313643 A JP2001313643 A JP 2001313643A JP 2003120439 A JP2003120439 A JP 2003120439A
- Authority
- JP
- Japan
- Prior art keywords
- internal combustion
- combustion engine
- purge
- control valve
- purge control
- 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.)
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- Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、内燃機関の蒸発燃
料処理装置の改良に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved fuel vapor treatment system for an internal combustion engine.
【０００２】[0002]
【従来の技術】従来の内燃機関に備えられた蒸発燃料処
理装置として、特開平８−７４６８２号公報や特開平９
−８８７３６号公報に記載のものがある。2. Description of the Related Art Japanese Patent Laid-Open No. 8-74682 and Japanese Patent Laid-Open No. 9-68682 are known examples of an evaporated fuel processing apparatus provided in a conventional internal combustion engine.
There is one described in JP-A-88736.
【０００３】特開平８−７４６８２号公報に記載の技術
は、予め定められたエンジン運転状態のときに、パージ
制御弁を開閉する所定周期を通常より短くするものであ
る。The technique disclosed in Japanese Unexamined Patent Publication No. 8-74682 is to shorten a predetermined cycle for opening and closing the purge control valve shorter than usual when the engine is in a predetermined operating state.
【０００４】また、特開平９−８８７３６号公報に記載
の技術は、パージ制御弁の開弁周期を、各気筒の同一行
程時期毎に出力させる基準信号の出力周期に、気筒数の
約数（１を除く）を約数として持たない整数を乗じた周
期に設定するもので、機関の低回転速度域では高回転速
度域に比較して基準信号出力周期に乗じられる整数の値
を小さくしてパージ制御弁の開弁周期を設定することが
開示される。Further, in the technique disclosed in Japanese Patent Laid-Open No. 9-88736, the purge control valve opening cycle is output as a reference signal for outputting the same stroke timing of each cylinder. (Excluding 1) is set as a cycle that is multiplied by an integer that does not have a divisor, and in the low rotation speed range of the engine, the integer value that is multiplied by the reference signal output cycle is made smaller than in the high rotation speed range. It is disclosed to set the valve opening cycle of the purge control valve.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、特開平
８−７４６８２号公報に記載の技術では、所定のエンジ
ン回転数以下の領域で周期を短くするため、分配された
パージガスの吸入空気量に占める割合が低い。つまりパ
ージガスによる空燃比変動が小さい領域についてもパー
ジ制御弁の開閉周期を短くすることになり、結果として
流量精度を悪化させる恐れがあるという問題が生じる。However, in the technique disclosed in Japanese Unexamined Patent Publication No. 8-74682, the ratio of the distributed purge gas to the intake air amount is shortened in order to shorten the cycle in a region below a predetermined engine speed. Is low. That is, the opening / closing cycle of the purge control valve is shortened even in a region where the air-fuel ratio fluctuation due to the purge gas is small, and as a result, there is a problem that the flow rate accuracy may be deteriorated.
【０００６】また、特開平９−８８７３６号公報に記載
の技術では、基準信号の出力周期の整数倍を駆動周期と
し、エンジン回転数に同期させているので、低回転、低
負荷時等のエンジン吸入空気量が少ない領域で空燃比変
動を抑制しようとした場合、エンジン負荷によらずある
一定エンジン回転数以下の領域で周期を長くすることに
なる。その結果、パージ制御弁の駆動周波数が小さくな
り、パージガスが１気筒に供給されてしまい、他の気筒
に比べて空燃比変動が大きくなる問題がある。Further, in the technique disclosed in Japanese Patent Laid-Open No. 9-88736, the driving cycle is set to an integral multiple of the output cycle of the reference signal and is synchronized with the engine speed, so that the engine is operated at low rotation speed and low load. When it is attempted to suppress the air-fuel ratio fluctuation in a region where the intake air amount is small, the cycle is lengthened in a region where the engine speed is equal to or lower than a certain value regardless of the engine load. As a result, the drive frequency of the purge control valve becomes small, the purge gas is supplied to one cylinder, and there is a problem that the air-fuel ratio fluctuation becomes larger than that in the other cylinders.
【０００７】そこで本発明の目的は、エンジン運転領域
によらず、パージによる気筒別の空燃比変動を抑制し、
エンジンの燃焼安定性を向上させる蒸発燃料処理装置を
提供することである。Therefore, an object of the present invention is to suppress the air-fuel ratio variation for each cylinder due to the purge regardless of the engine operating range,
It is an object of the present invention to provide an evaporated fuel processing device that improves combustion stability of an engine.
【０００８】[0008]
【課題を解決するための手段】第１の発明は、燃料系か
ら発生する蒸発燃料を一時的に吸着させるキャニスタ
と、このキャニスタから離脱した蒸発燃料と空気とを混
合したパージ混合気を内燃機関の吸気系に供給するため
のパージ通路と、前記パージ通路に介装され、パージ混
合気の流量を制御するパージ制御弁と、前記パージ制御
弁の開弁周期を制御するコントローラとを備え、前記コ
ントローラは、前記パージ制御弁の開弁周期を、内燃機
関の各気筒の同一行程時期毎に出力される基準信号の出
力周期に、気筒数の約数（１を除く）を約数として有さ
ない一つの整数を乗じて算出し、この算出した開弁周期
に基づき前記パージ制御弁を制御する内燃機関の蒸発燃
料処理装置において、前記コントローラは、前記内燃機
関の運転状態に応じて、前記整数の値を変化させ、前記
パージ制御弁の開閉周期を制御する。A first aspect of the present invention is a canister for temporarily adsorbing vaporized fuel generated from a fuel system, and a purge mixture obtained by mixing vaporized fuel and air separated from the canister with an internal combustion engine. A purge control valve for controlling the flow rate of the purged air-fuel mixture, and a controller for controlling the opening period of the purge control valve. The controller has the opening cycle of the purge control valve as a divisor of the number of cylinders (excluding 1) in the output cycle of the reference signal output at each same stroke timing of each cylinder of the internal combustion engine. In the evaporative fuel processing apparatus for an internal combustion engine, which calculates the value by multiplying by one integer, and which controls the purge control valve based on the calculated valve opening period, the controller controls the operating state of the internal combustion engine. , By changing the value of the integer, controls the opening and closing period of the purge control valve.
【０００９】第２の発明は、第１の発明において、前記
コントローラは、前記内燃機関に供給される吸入空気量
に対するパージ混合気の割合が所定値以下になるように
前記パージ制御弁の開閉周期を制御する。In a second aspect based on the first aspect, the controller controls the opening / closing cycle of the purge control valve so that the ratio of the purge mixture to the amount of intake air supplied to the internal combustion engine becomes a predetermined value or less. To control.
【００１０】第３の発明は、第１または２の発明におい
て、前記コントローラは、前記内燃機関の運転状態が低
回転低負荷状態に変化したときに、前記整数をより小さ
な整数に変更して前記パージ制御弁の開閉周期を制御す
る。In a third aspect based on the first or second aspect, the controller changes the integer to a smaller integer when the operating state of the internal combustion engine changes to a low rotation low load state. Controls the open / close cycle of the purge control valve.
【００１１】[0011]
【発明の効果】第１の発明では、コントローラが、前記
パージ制御弁の開弁周期を、内燃機関の各気筒の同一行
程時期毎に出力される基準信号の出力周期に、気筒数の
約数（１を除く）を約数として有さない一つの整数を乗
じて算出し、この算出した開弁周期に基づき前記パージ
制御弁を制御するが、この整数を内燃機関の運転条件に
応じて変化させることにより、例えば、運転状態が低負
荷低回転に変化したときには整数を小さい整数に変える
ことにより、内燃機関の全運転領域において、パージに
よる気筒別の空燃比変動を抑制し、エンジンの燃焼安定
性を向上させる最適な開弁周期とすることができる。According to the first aspect of the present invention, the controller sets the opening cycle of the purge control valve to the output cycle of the reference signal output at each same stroke timing of each cylinder of the internal combustion engine to a divisor of the number of cylinders. It is calculated by multiplying by one integer that does not have (excluding 1) as a divisor, and the purge control valve is controlled based on this calculated valve opening period, but this integer changes according to the operating conditions of the internal combustion engine. By, for example, changing the integer to a small integer when the operating state changes to low load and low rotation, suppresses the cylinder-by-cylinder air-fuel ratio variation due to purge in the entire operating range of the internal combustion engine, and stabilizes combustion of the engine. It is possible to make the valve opening cycle optimal for improving the property.
【００１２】第２の発明では、コントローラが、前記内
燃機関に供給される吸入空気量に対するパージ混合気の
割合が所定値以下になるようにパージ制御弁の開閉周期
を制御するので、内燃機関の全領域において、気筒別の
パージ混合気の割合を所定値以下とすることができる。In the second aspect of the present invention, the controller controls the opening / closing cycle of the purge control valve so that the ratio of the purged air-fuel mixture to the intake air amount supplied to the internal combustion engine becomes equal to or less than a predetermined value. In all the regions, the ratio of the purge mixture for each cylinder can be set to a predetermined value or less.
【００１３】第３の発明では、コントローラは、内燃機
関の運転状態が低回転低負荷状態に変化したときに、整
数をより小さな整数に変更してパージ制御弁の開閉周期
を制御するので、吸入空気量に対するパージ量の影響が
大きい低回転低負荷時においても安定した燃焼を維持で
きる。In the third aspect of the present invention, the controller controls the opening / closing cycle of the purge control valve by changing the integer to a smaller integer when the operating state of the internal combustion engine changes to the low rotation / low load state. Stable combustion can be maintained even at low rotation and low load where the influence of the purge amount on the air amount is large.
【００１４】[0014]
【発明の実施の形態】以下、本発明が適用される内燃機
関の一実施形態を添付図面に基づいて説明する。BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of an internal combustion engine to which the present invention is applied will be described below with reference to the accompanying drawings.
【００１５】図１は、本発明の内燃機関の概略構成図を
示す。内燃機関１のシリンダ内に供給される吸気は、ス
ロットル弁２によってその吸入量を制御され、吸気マニ
ホールド３を通過してシリンダ内に送られる。スロット
ル弁２の下流にはシリンダ内に所定量の燃料を噴霧する
燃料噴射弁４が設置され、燃料噴射弁４からの噴射され
る燃料の噴射量は、内燃機関１の運転状態に応じてコン
トローラ５によって制御される。FIG. 1 is a schematic block diagram of an internal combustion engine of the present invention. The amount of intake air supplied to the cylinder of the internal combustion engine 1 is controlled by the throttle valve 2, passes through the intake manifold 3, and is sent into the cylinder. A fuel injection valve 4 for spraying a predetermined amount of fuel is installed in the cylinder downstream of the throttle valve 2, and the injection amount of fuel injected from the fuel injection valve 4 is a controller depending on the operating state of the internal combustion engine 1. Controlled by 5.
【００１６】シリンダから排出される排気ガスは排気マ
ニホールド６から外部に排出される。Exhaust gas discharged from the cylinder is discharged from the exhaust manifold 6 to the outside.
【００１７】スロットル弁２の上流には吸入空気量Ｑを
検出するためのエアフローメータ７が、また排気マニホ
ールド６には、排気ガス中の空燃比を検出するための酸
素センサ８が設置され、さらには冷却水温度を検出する
水温センサ９とエンジン回転数Ｎｅを検出するための回
転数センサ１０が内燃機関１に設置される。An air flow meter 7 for detecting the intake air amount Q is installed upstream of the throttle valve 2, and an oxygen sensor 8 for detecting the air-fuel ratio in the exhaust gas is installed on the exhaust manifold 6. A water temperature sensor 9 for detecting the cooling water temperature and a rotation speed sensor 10 for detecting the engine rotation speed Ne are installed in the internal combustion engine 1.
【００１８】これらの各種センサの出力はコントローラ
５に送られ、コントローラ５は、これらの信号に基づい
て例えば、前述の燃料噴射量制御を行う。The outputs of these various sensors are sent to the controller 5, and the controller 5 controls the fuel injection amount based on these signals, for example.
【００１９】内燃機関１には、蒸発燃料処理装置が備え
られている。この蒸発燃料処理装置は、燃料タンク１１
内で蒸発した蒸発燃料であるベーパを吸着するキャニス
タ１２と、吸着した蒸発燃料と空気を混合したパージ混
合気をスロットル弁２下流の吸気マニホールド３に供給
するパージ通路１３と、吸気マニホールド３へのパージ
混合気の供給量を制御するための電磁駆動式のパージ制
御弁（以下、ＰＣ／Ｖという。）１４とからなる。ＰＣ
／Ｖ１４の開閉はコントローラ５によって制御されてお
り、コントローラ５から出力される制御信号に基づいて
周期的に開弁時間（パルス幅）を制御することで、内燃
機関１に供給するパージ混合気流量を制御する。The internal combustion engine 1 is equipped with an evaporated fuel processing device. This evaporative fuel processing device is provided with a fuel tank
A canister 12 that adsorbs vapor, which is vaporized fuel that has evaporated inside, a purge passage 13 that supplies a purge mixture that is a mixture of adsorbed vaporized fuel and air, to the intake manifold 3 downstream of the throttle valve 2, and to the intake manifold 3. An electromagnetically driven purge control valve (hereinafter referred to as PC / V) 14 for controlling the supply amount of the purged air-fuel mixture. PC
The opening / closing of / V14 is controlled by the controller 5, and the purge mixture flow rate supplied to the internal combustion engine 1 is controlled by periodically controlling the valve opening time (pulse width) based on the control signal output from the controller 5. To control.
【００２０】詳しく説明すると、コントローラ５は、内
燃機関の各気筒に分配されたパージ混合気の吸入空気量
に占める割合ＱＰＡを算出し、この割合が所定値ＱＰＡ
Ｔ以下になるようにＰＣ／Ｖ１４の開閉駆動周期を制御
する。More specifically, the controller 5 calculates the ratio QPA of the purged air-fuel mixture distributed to each cylinder of the internal combustion engine to the intake air amount, and this ratio is a predetermined value QPA.
The opening / closing drive cycle of the PC / V 14 is controlled so as to be T or less.
【００２１】コントローラ５が行うＰＣ／Ｖ１４の制御
内容を説明するフローチャートが図２である。FIG. 2 is a flow chart for explaining the control contents of the PC / V 14 performed by the controller 5.
【００２２】なお、内燃機関１は４気筒エンジンであ
り、ＰＣ／Ｖ１４の駆動周期は、エンジンの各気筒の同
一行程時期毎に出力される基準信号の出力周期にエンジ
ン気筒数の１を除く約数を約数として持たない整数を乗
じた周期とする。具体的には４気筒の場合には、ＰＣ／
Ｖ１４の駆動周期は、基準信号に３、５、７、１１、１
３等の整数を乗じた周期ＲＥＦＴとなるが、簡単のため
ＲＥＦＴ＝３、５、７の場合を例として説明する。The internal combustion engine 1 is a four-cylinder engine, and the drive cycle of the PC / V 14 is approximately the same as the number of engine cylinders except the number of engine cylinders in the output cycle of the reference signal output at each same stroke time of each cylinder of the engine. It is a period multiplied by an integer that does not have a number as a divisor. Specifically, in the case of 4 cylinders, PC /
The drive cycle of V14 is 3, 5, 7, 11, 1 for the reference signal.
The cycle is REFT multiplied by an integer such as 3. However, for simplicity, the case of REFT = 3, 5, and 7 will be described as an example.
【００２３】まず、ステップ１で吸入空気量Ｑとエンジ
ン回転数Ｎｅとエンジンの冷却水温Ｔｗを入力し、ステ
ップ２でパージ混合気処理条件かどうかを判定する。処
理条件を満たさない場合には制御を終了する。処理条件
を満たす場合には、続くステップ３で目標パージ率Ｐ
Ｒ、ＰＣ／Ｖ１４の開弁比率ＤＵＴＹを算出する。次に
ステップ４で、パージ混合気の吸入空気量に占める割合
ＱＰＡが高い値を示す、大きな整数ＲＥＦＴ＝７を乗じ
る場合のＱＰＡを算出し、エンジン燃焼安定性が確保で
きるパージ混合気が吸入空気量に占める割合の上限値で
ある所定値ＱＰＡＴと比較し、ＱＰＡＴ以下のときには
ステップ５に進み、ＲＥＦＴとして７を設定し、ステッ
プ９に進む。ＱＰＡＴを超えるときにはステップ６に進
み、ＲＥＦＴ＝５の場合でのＱＰＡを算出し、ＱＰＡＴ
と比較する。ＱＰＡＴ以下のときにはステップ７に進
み、ＲＥＦＴとして５を設定し、ステップ９に進む。Ｑ
ＰＡＴを超えるときにはステップ８に進み、ステップ８
でＲＥＦＴとして３を設定し、ステップ９に進む。ステ
ップ９では設定されたＲＥＦＴに基づいてＰＣ／Ｖ１４
の開弁時間Ｔを算出し、ステップ１０でＰＣ／Ｖ１４を
算出された開弁時間Ｔで制御を行い、終了する。First, in step 1, the intake air amount Q, the engine speed Ne and the engine cooling water temperature Tw are input, and in step 2, it is determined whether or not the purge mixture processing condition is satisfied. If the processing conditions are not satisfied, the control ends. If the processing conditions are satisfied, the target purge rate P
The valve opening ratio DUTY of R and PC / V14 is calculated. Next, at step 4, the QPA when the ratio QPA of the intake air amount of the purged mixture shows a high value and is multiplied by a large integer REFT = 7 is calculated, and the purged mixture that can secure the engine combustion stability is the intake air. The value is compared with a predetermined value QPAT, which is the upper limit of the proportion of the quantity, and when it is less than or equal to QPAT, the process proceeds to step 5, the REFT is set to 7, and the process proceeds to step 9. When it exceeds QPAT, the process proceeds to step 6, where QPA when REFT = 5 is calculated, and QPAT is calculated.
Compare with. When it is less than or equal to QPAT, the process proceeds to step 7, the REFT is set to 5, and the process proceeds to step 9. Q
When the PAT is exceeded, proceed to Step 8 and Step 8
Then, 3 is set as REFT, and the process proceeds to step 9. In step 9, PC / V14 based on the set REFT
The valve opening time T is calculated, and the PC / V 14 is controlled by the calculated valve opening time T in step 10, and the process ends.
【００２４】次にパージ混合気の吸入空気量に占める割
合ＱＰＡの算出について説明する。Next, the calculation of the ratio QPA of the purge mixture to the intake air amount will be described.
【００２５】パージ混合気が分配される内燃機関１の気
筒数ＤＮは、ＤＵＴＹとＲＥＦＴから下式で表される。The number of cylinders DN of the internal combustion engine 1 to which the purged air-fuel mixture is distributed is expressed by the following equation from DUTY and REFT.
【００２６】[0026]
【数１】
また、ＰＣ／Ｖ１４の１開弁タイミング当たりのパージ
流量ＱＰ１は、目標パージ率ＰＲは気筒数が４気筒の場
合には、次式で与えられる。[Equation 1] Further, the purge flow rate QP1 per one valve opening timing of the PC / V 14 is given by the following equation when the target purge rate PR is four cylinders.
【００２７】[0027]
【数２】
１気筒当たりのパージ流量ＱＰ２は、ＱＰ１をＤＮで除
したものと定義すると、[Equation 2] If the purge flow rate QP2 per cylinder is defined as QP1 divided by DN,
【００２８】[0028]
【数３】 で示される。[Equation 3] Indicated by.
【００２９】４気筒内燃機関の１気筒当たりの吸入空気
量ＱＡ２は、The intake air amount QA2 per cylinder of a four-cylinder internal combustion engine is
【００３０】[0030]
【数４】 であり、ＱＰＡは次式で示される。[Equation 4] And QPA is expressed by the following equation.
【００３１】[0031]
【数５】
したがって、ＱＰＡは、式（３）から式（５）から次式
となる。[Equation 5] Therefore, the QPA becomes the following equation from the equation (3) to the equation (5).
【００３２】[0032]
【数６】
したがって、ＱＰＡが所定値ＱＰＡＴ以下となるよう
に、つまり下式が成立するようにＰＣ／Ｖ１４の駆動周
期ＲＥＦＴを選定する（図２に示したフローチャートの
ステップ４からステップ８の制御を示す）。[Equation 6] Therefore, the drive cycle REFT of the PC / V 14 is selected so that QPA becomes equal to or less than the predetermined value QPAT, that is, the following expression is satisfied (the control of steps 4 to 8 of the flowchart shown in FIG. 2 is shown).
【００３３】[0033]
【数７】
図３は、本発明によるＰＣ／Ｖ１４の駆動周期ＲＥＦＴ
を説明するタイミングチャートである。[Equation 7] FIG. 3 shows the drive cycle REFT of the PC / V 14 according to the present invention.
3 is a timing chart for explaining the above.
【００３４】図３（ａ）と（ｂ）は、内燃機関が低負荷
低回転で運転した場合を示している。FIGS. 3A and 3B show the case where the internal combustion engine is operated at low load and low rotation.
【００３５】なお、制御条件としては、４気筒内燃機関
であって、Ｎｅ＝１０００ｒｐｍ、ブースト圧＝−５０
０ｍｍＨｇ、Ｑ＝２００Ｌ／ｍｉｎ、ＰＲ＝１％（パー
ジ流量２Ｌ／ｍｉｎ）、ＰＣ／Ｖの全開時の流量は５０
Ｌ／ｍｉｎとする。The control conditions are a four-cylinder internal combustion engine, Ne = 1000 rpm, boost pressure = -50.
0 mmHg, Q = 200 L / min, PR = 1% (Purge flow rate 2 L / min), PC / V fully open flow rate is 50
L / min.
【００３６】まず図３（ａ）に示したタイミングチャー
トは、ＲＥＦ＝７のときのタイミングチャートであり、
今、Ｎｅ＝１０００ｒｐｍであるから、１ＲＥＦは３０
ｍｓｅｃで、１ＲＥＦ当たりのＱａは０．１Ｌである。
したがって、７ＲＥＦ当たりでは、Ｑａは０．７Ｌとな
り、パージ流量は、パージ率１％から０．００７Ｌであ
る。ＰＣ／Ｖ１４の全開時の流量は５０Ｌ／ｍｉｎであ
るから、７ＲＥＦ当たりでは、０．１７５Ｌとなり、開
弁比率ＤＵＴＹ＝４％である。したがって、ＰＣ／Ｖ１
４の開弁時間は、３０×７×０．０４＝８．４ｍｓｅｃ
となる。よってパージガスは１気筒にしか供給されず、
分配されたパージガスの供給空気量に占める割合ＱＰＡ
は（パージ流量＝０．００７Ｌ）／（Ｑａ＝０．１Ｌ）
から７％となる。First, the timing chart shown in FIG. 3A is a timing chart when REF = 7.
Since Ne = 1000 rpm, 1REF is 30
In msec, Qa per REF is 0.1L.
Therefore, Qa is 0.7 L per 7 REF, and the purge flow rate is from the purge rate of 1% to 0.007 L. Since the flow rate of the PC / V 14 when fully opened is 50 L / min, it becomes 0.175 L per 7 REF, and the valve opening ratio DUTY = 4%. Therefore, PC / V1
The valve opening time of No. 4 is 30 × 7 × 0.04 = 8.4 msec.
Becomes Therefore, the purge gas is supplied to only one cylinder,
Ratio of distributed purge gas to supply air amount QPA
Is (Purge flow rate = 0.007L) / (Qa = 0.1L)
To 7%.
【００３７】図３（ｂ）は、図３（ａ）に対してＲＥＦ
＝３の場合を示しており、ＲＥＦ＝７と同様にして、Ｑ
ＰＡは３％となり、ＲＥＦ＝７の場合よりもＱＰＡの値
が小さくなることがわかる。このように低回転低負荷時
にはＲＥＦを小さな値とすることでＰＱＡ値を小さく抑
制し、安定した燃焼を確保できる。FIG. 3 (b) shows REF with respect to FIG. 3 (a).
= 3, the same as REF = 7, Q
It is understood that PA is 3%, and the value of QPA is smaller than that when REF = 7. As described above, when the rotation speed is low and the load is low, the PQA value is suppressed to be small by setting the REF to a small value, and stable combustion can be secured.
【００３８】図３（ｃ）は、高回転高負荷の場合を示し
ており、条件としては、４気筒内燃機関であって、Ｎｅ
＝５０００ｒｐｍ、ブースト圧＝−１００ｍｍＨｇ、Ｑ
＝５０００Ｌ／ｍｉｎ、ＰＲ＝１％（パージ流量５０Ｌ
／ｍｉｎ）、ＰＣ／Ｖ１４の全開時の流量は２５Ｌ／ｍ
ｉｎ、ＲＥＦ＝７とする。結果としてＱＰＡ＝０．５％
となり、低回転低負荷の場合より、ＱＰＡ値が小さくな
る。FIG. 3 (c) shows the case of high rotation and high load, and the condition is a four cylinder internal combustion engine, Ne
= 5000 rpm, boost pressure = -100 mmHg, Q
= 5000 L / min, PR = 1% (Purge flow rate 50 L
/ Min), the flow rate when the PC / V14 is fully opened is 25 L / m
in, REF = 7. As a result, QPA = 0.5%
Therefore, the QPA value becomes smaller than in the case of low rotation and low load.
【００３９】図３（ｄ）は、低回転高負荷の場合を示し
ており、条件としては、４気筒内燃機関であって、Ｎｅ
＝１０００ｒｐｍ、ブースト圧＝−１００ｍｍＨｇ、Ｑ
＝１０００Ｌ／ｍｉｎ、ＰＲ＝１％（パージ流量１０Ｌ
／ｍｉｎ）、ＰＣ／Ｖ１４の全開時の流量は２５Ｌ／ｍ
ｉｎ、ＲＥＦ＝７とする。結果としてＱＰＡ＝平均２．
５％となり、低回転低負荷の場合より、ＱＰＡ値が小さ
くなる。FIG. 3 (d) shows the case of low rotation and high load, and the condition is a four-cylinder internal combustion engine, Ne
= 1000 rpm, boost pressure = -100 mmHg, Q
= 1000 L / min, PR = 1% (Purge flow rate 10 L
/ Min), the flow rate when the PC / V14 is fully opened is 25 L / m
in, REF = 7. As a result QPA = average 2.
It becomes 5%, and the QPA value becomes smaller than in the case of low rotation and low load.
【００４０】さらに、図３（ｅ）は、高回転低負荷の場
合を示しており、条件としては、４気筒内燃機関であっ
て、Ｎｅ＝５０００ｒｐｍ、ブースト圧＝−５００ｍｍ
Ｈｇ、Ｑ＝１０００Ｌ／ｍｉｎ、ＰＲ＝１％（パージ流
量１０Ｌ／ｍｉｎ）、ＰＣ／Ｖ１４の全開時の流量は５
０Ｌ／ｍｉｎ、ＲＥＦ＝７とする。結果としてＱＰＡ＝
平均４．７％となり、低回転低負荷の場合より、ＱＰＡ
値が小さくなる。Further, FIG. 3 (e) shows the case of high rotation and low load, and the conditions are a four-cylinder internal combustion engine, Ne = 5000 rpm, boost pressure = -500 mm.
Hg, Q = 1000 L / min, PR = 1% (purge flow rate 10 L / min), flow rate of PC / V14 when fully opened is 5
0L / min and REF = 7. As a result QPA =
The average is 4.7%, which is better than the case of low rotation and low load.
The value becomes smaller.
【００４１】このように本発明においては、パージ制御
弁の開弁周期を、内燃機関の各気筒の同一行程時期毎に
出力される基準信号の出力周期に、気筒数の約数（１を
除く）を約数として有さない一つの整数を乗じて算出
し、この算出した開弁周期に基づき前記パージ制御弁を
制御する内燃機関において、内燃機関の運転状態に応じ
て、前記整数の値を変化させ、内燃機関１に供給される
吸入空気量に対するパージ混合気の割合が所定値以下に
なるようにパージ制御弁１４の開閉周期を制御するの
で、内燃機関４の全運転領域において、パージによる気
筒別の空燃比変動を抑制し、エンジン燃焼安定性を向上
することができる。As described above, in the present invention, the purge control valve opening cycle is set to the output cycle of the reference signal output at each identical stroke timing of each cylinder of the internal combustion engine, and the divisor (excluding 1) of the number of cylinders is excluded. ) As a divisor is calculated by multiplying it by an integer, and in the internal combustion engine that controls the purge control valve based on the calculated valve opening period, the value of the integer is calculated according to the operating state of the internal combustion engine. Since the opening / closing cycle of the purge control valve 14 is controlled so that the ratio of the purged air-fuel mixture to the intake air amount supplied to the internal combustion engine 1 is changed to a predetermined value or less, the purge operation is performed in the entire operating region of the internal combustion engine 4. It is possible to suppress variation in air-fuel ratio for each cylinder and improve engine combustion stability.
【００４２】本発明は、上記した実施形態に限定される
ものではなく、本発明の技術的思想の範囲内でさまざま
な変更がなしうることは明白である。The present invention is not limited to the above-mentioned embodiments, and it is obvious that various modifications can be made within the scope of the technical idea of the present invention.
【図１】本発明の蒸発燃料処理装置の構成図である。FIG. 1 is a configuration diagram of an evaporated fuel processing device of the present invention.
【図２】同じくコントローラが実施するパージ制御弁の
制御内容を説明するフローチャートである。FIG. 2 is a flowchart illustrating the control contents of the purge control valve, which is also executed by the controller.
【図３】同じくパージ制御弁の駆動タイミングを説明す
る図である。FIG. 3 is a diagram for explaining the drive timing of the purge control valve.
１ 内燃機関 ２ スロットル弁 ３ 吸気マニホールド ４ 燃料噴射弁 ５ コントローラ ６ 排気マニホールド ７ エアフローメータ １３ パージ通路 １４ パージ制御弁 1 Internal combustion engine 2 Throttle valve 3 intake manifold 4 Fuel injection valve 5 controller 6 exhaust manifold 7 Air flow meter 13 Purge passage 14 Purge control valve
Claims (3)
着させるキャニスタと、 このキャニスタから離脱した蒸発燃料と空気とを混合し
たパージ混合気を内燃機関の吸気系に供給するためのパ
ージ通路と、 前記パージ通路に介装され、パージ混合気の流量を制御
するパージ制御弁と、前記パージ制御弁の開弁周期を制
御するコントローラとを備え、 前記コントローラは、前記パージ制御弁の開弁周期を、
内燃機関の各気筒の同一行程時期毎に出力される基準信
号の出力周期に、気筒数の約数（１を除く）を約数とし
て有さない一つの整数を乗じて算出し、この算出した開
弁周期に基づき前記パージ制御弁を制御する内燃機関の
蒸発燃料処理装置において、 前記コントローラは、前記内燃機関の運転状態に応じ
て、前記整数の値を変化させ、前記パージ制御弁の開閉
周期を制御することを特徴とする内燃機関の蒸発燃料処
理装置。Claim: What is claimed is: 1. A canister for temporarily adsorbing evaporated fuel generated from a fuel system, and a purge passage for supplying a purge mixture, which is a mixture of evaporated fuel and air separated from the canister, to an intake system of an internal combustion engine. A purge control valve that is interposed in the purge passage and that controls the flow rate of the purge mixture, and a controller that controls the valve opening period of the purge control valve, the controller opening the purge control valve. Cycle
Calculated by multiplying the output cycle of the reference signal output at each same stroke time of each cylinder of the internal combustion engine by one integer that does not have a divisor (excluding 1) of the number of cylinders as a divisor In an evaporative fuel processing system for an internal combustion engine that controls the purge control valve based on a valve opening cycle, the controller changes the integer value according to an operating state of the internal combustion engine to open and close the purge control valve. For controlling the evaporated fuel of an internal combustion engine.
される吸入空気量に対するパージ混合気の割合が所定値
以下になるように前記パージ制御弁の開閉周期を制御す
ることを特徴とする請求項１に記載の内燃機関の蒸発燃
料処理装置。2. The controller controls the opening / closing cycle of the purge control valve so that the ratio of the purged air-fuel mixture to the amount of intake air supplied to the internal combustion engine is below a predetermined value. 1. The evaporated fuel processing device for an internal combustion engine according to 1.
状態が低回転低負荷状態に変化したときに、前記整数を
より小さな整数に変更して前記パージ制御弁の開閉周期
を制御することを特徴とする請求項１または２に記載の
内燃機関の蒸発燃料処理装置。3. The controller controls the opening / closing cycle of the purge control valve by changing the integer to a smaller integer when the operating state of the internal combustion engine changes to a low rotation / low load state. The evaporated fuel processing apparatus for an internal combustion engine according to claim 1 or 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001313643A JP4045771B2 (en) | 2001-10-11 | 2001-10-11 | Evaporative fuel processing device for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001313643A JP4045771B2 (en) | 2001-10-11 | 2001-10-11 | Evaporative fuel processing device for internal combustion engine |
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| Publication Number | Publication Date |
|---|---|
| JP2003120439A true JP2003120439A (en) | 2003-04-23 |
| JP4045771B2 JP4045771B2 (en) | 2008-02-13 |
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ID=19132081
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001313643A Expired - Fee Related JP4045771B2 (en) | 2001-10-11 | 2001-10-11 | Evaporative fuel processing device for internal combustion engine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015135081A (en) * | 2014-01-17 | 2015-07-27 | 株式会社デンソー | Purge control device |
| WO2023095225A1 (en) * | 2021-11-25 | 2023-06-01 | 日産自動車株式会社 | Purge valve control method and control device of evaporated fuel processing device |
-
2001
- 2001-10-11 JP JP2001313643A patent/JP4045771B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015135081A (en) * | 2014-01-17 | 2015-07-27 | 株式会社デンソー | Purge control device |
| WO2023095225A1 (en) * | 2021-11-25 | 2023-06-01 | 日産自動車株式会社 | Purge valve control method and control device of evaporated fuel processing device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4045771B2 (en) | 2008-02-13 |
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