JP3337410B2 - Evaporative fuel treatment system for internal combustion engine - Google Patents
Evaporative fuel treatment system for internal combustion engineInfo
- Publication number
- JP3337410B2 JP3337410B2 JP35083397A JP35083397A JP3337410B2 JP 3337410 B2 JP3337410 B2 JP 3337410B2 JP 35083397 A JP35083397 A JP 35083397A JP 35083397 A JP35083397 A JP 35083397A JP 3337410 B2 JP3337410 B2 JP 3337410B2
- Authority
- JP
- Japan
- Prior art keywords
- load
- purge
- opening
- auxiliary
- amount
- 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 - Fee Related
Links
Landscapes
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)
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
処理装置に関し、詳しくは、パージエアの輸送遅れ等に
よる空燃比変動を抑止するための技術に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an evaporative fuel processing apparatus for an internal combustion engine, and more particularly to a technique for suppressing an air-fuel ratio change due to a delay in purge air transportation.
【０００２】[0002]
【従来の技術】従来の内燃機関の蒸発燃料処理装置は、
燃料タンクにて発生する蒸発燃料を吸着捕集するキャニ
スタと、このキャニスタから機関の吸気系への蒸発燃料
のパージ通路に介装されて蒸発燃料のパージ量を制御す
るパージ制御弁とを備えて構成される。そして、前記パ
ージ制御弁を、例えば機関の吸入空気量に応じた開度に
制御してパージ率を一定に制御していた。2. Description of the Related Art A conventional evaporative fuel processing apparatus for an internal combustion engine is:
A canister that adsorbs and collects evaporative fuel generated in the fuel tank; and a purge control valve that is interposed in a purge passage for evaporative fuel from the canister to an intake system of the engine and controls a purge amount of the evaporative fuel. Be composed. Then, the purge control valve is controlled to an opening degree corresponding to, for example, the intake air amount of the engine to control the purge rate constant.
【０００３】また、エアコンやパワステなどの補機負荷
が投入されると、スロットル弁をバイパスして設けられ
た補助空気通路を開制御したり、電制スロットルシステ
ムではスロットル開度を増大変化させたりして、アイド
ル運転状態等の低回転，低負荷時に補機負荷の投入に見
合った機関出力トルクが得られるようにした空気量制御
が知られている。When an auxiliary load such as an air conditioner or a power steering is applied, an auxiliary air passage provided by bypassing a throttle valve is controlled to be opened. In an electronically controlled throttle system, a throttle opening is increased and changed. In addition, there is known an air amount control that can obtain an engine output torque commensurate with the input of an auxiliary load during low rotation and low load in an idling operation state or the like.
【０００４】[0004]
【発明が解決しようとする課題】ところで、吸入空気量
に応じてパージ制御弁の開度を制御する構成では、前記
空気量制御によって空気量が変化すると、それに対応し
て前記パージ制御弁の開度制御量を変化させることにな
るが、パージエアの輸送遅れがあり、また、一般にパー
ジの制御周期が遅いため、シリンダ吸入空気量の変化に
対してパージエアの変化に応答遅れを生じてパージ率が
変動し、これによって、燃焼混合気の空燃比が目標空燃
比からずれて燃焼安定性が悪化し、失火や回転変動を招
く可能性があった。特に、燃焼室内に直接燃料を噴射す
るガソリン機関であって、圧縮行程中の燃料噴射によっ
て成層燃焼を行わせる場合には、点火栓回りの混合気の
空燃比を精度良く制御することが要求されるが、前記パ
ージ率の変動によって点火栓回りの混合気の空燃比が変
動し、これによって、着火・燃焼性能が悪化して、失火
や回転変動などを引き起こす可能性があった。In the configuration in which the opening of the purge control valve is controlled in accordance with the intake air amount, when the air amount changes due to the air amount control, the opening of the purge control valve correspondingly changes. However, there is a delay in purge air transportation, and the purge control cycle is generally slow. As a result, the air-fuel ratio of the combustion air-fuel mixture deviates from the target air-fuel ratio, deteriorating the combustion stability, and possibly causing misfiring or rotation fluctuation. In particular, in the case of a gasoline engine that directly injects fuel into the combustion chamber and performs stratified combustion by fuel injection during the compression stroke, it is required to accurately control the air-fuel ratio of the air-fuel mixture around the spark plug. However, the air-fuel ratio of the air-fuel mixture around the spark plug fluctuates due to the fluctuation of the purge rate, thereby deteriorating the ignition / combustion performance and possibly causing misfiring or rotation fluctuation.
【０００５】例えば図５に示すように、補機負荷のＯＦ
Ｆ→ＯＮ時（投入時）には、空気量が増大変化し、これ
に対応してパージ制御弁の開度を増大させることになる
が、パージの制御周期が比較的長いため開度制御量の更
新が遅れ、更に、パージエアはインテークマニホールド
内に拡散した後にシリンダ内に吸引されるために輸送遅
れがあり、吸入空気量の増大変化に対してシリンダ内に
吸引されるパージエア量は遅れて増大変化することにな
る。従って、本来パージによってシリンダ内に供給され
るはずの燃料が不足することにより空燃比がリーン化
し、回転変動やヘジテーションを発生させることがあっ
たものである。[0005] For example, as shown in FIG.
When F → ON (at the time of injection), the air amount increases and changes, and the opening of the purge control valve is correspondingly increased. However, since the purge control cycle is relatively long, the opening control amount is increased. And the purge air diffuses into the intake manifold and is sucked into the cylinder after being diffused.Therefore, there is a delay in transport, and the amount of purge air sucked into the cylinder increases with a delay in response to an increase in the amount of intake air. Will change. Therefore, there is a case where the air-fuel ratio becomes lean due to a shortage of the fuel that should be supplied into the cylinder due to the purge, which causes rotation fluctuation and hesitation.
【０００６】一方、補機負荷のＯＮ→ＯＦＦ時には、空
気量の減少変化に対して、シリンダ内に吸引されるパー
ジエア量の減少が遅れることになり、これによって空燃
比がリッチ化し、回転変動や失火を招くことがあったも
のであり、特に、かかる空燃比のリッチ化による失火の
発生が問題となっていた。本発明は上記問題点に鑑みな
されたものであり、パージ中の補機負荷変化時に、パー
ジエアの応答遅れによって空燃比が変動することを抑止
できる蒸発燃料処理装置を提供することを目的とする。On the other hand, when the auxiliary load is changed from ON to OFF, the decrease in the amount of purge air sucked into the cylinder is delayed with respect to the decrease in the amount of air, thereby enriching the air-fuel ratio and causing rotation fluctuation and rotation fluctuation. Misfires were sometimes caused, and in particular, the occurrence of misfires due to the rich air-fuel ratio was a problem. SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide an evaporative fuel processing apparatus that can suppress a change in the air-fuel ratio due to a delay in the response of purge air when an auxiliary equipment load changes during purging.
【０００７】[0007]
【課題を解決するための手段】そのため請求項１記載の
発明は、図１に示すように構成される。図１において、
キャニスタは、燃料タンクにて発生する蒸発燃料を吸着
捕集し、パージ制御弁は、キャニスタから機関の吸気系
への蒸発燃料のパージ通路に介装されて蒸発燃料のパー
ジ量を制御する。The invention according to claim 1 is configured as shown in FIG. In FIG.
The canister adsorbs and collects the evaporative fuel generated in the fuel tank, and the purge control valve is interposed in a purge passage for the evaporative fuel from the canister to the intake system of the engine to control the amount of evaporative fuel purge.
【０００８】一方、補機負荷検出手段は補機負荷を検出
し、開度制御量補正手段は、所定の運転条件において前
記補機負荷検出手段で検出される補機負荷が変化したと
きに、前記パージ制御弁の開度制御量を、前記補機負荷
が変化してから所定時間においてより低開度側に補正す
る。かかる構成によると、エアコン用コンプレッサーや
パワステ用ポンプなどの機関駆動される補機の負荷が変
化すると、該補機負荷変化をトリガーとしてパージ制御
弁の開度制御量（例えば制御デューティ）を所定時間に
おいてより低開度側に補正する。 On the other hand, the auxiliary equipment load detecting means detects the auxiliary equipment load, and the opening degree control amount correcting means detects when the auxiliary equipment load detected by the auxiliary equipment load detecting means changes under a predetermined operating condition. The opening degree control amount of the purge control valve is
Is corrected to a lower opening side for a predetermined time after the
You. With this configuration, when the load of an engine-driven accessory such as a compressor for an air conditioner or a power steering pump changes, the change in the load of the purge control valve (for example, the control duty) is triggered by the change in the load of the accessory for a predetermined time. To
Correction to a lower opening side.
【０００９】[0009]
【００１０】[0010]
【００１１】[0011]
【００１２】[0012]
【００１３】特に、補機負荷のＯＮ→ＯＦＦ時に空燃比
がリッチ化するときに、所定時間だけ開度制御量をより
低開度側に補正してパージエア量を減少させることで、
前記リッチ化が抑止される。尚、前記低開度側への補正
には、全閉相当値への補正が含まれる。請求項２記載の
発明では、前記開度制御量補正手段が、前記所定時間経
過後から前記開度制御量を徐々に通常値に復帰させる構
成とした。In particular, when the air-fuel ratio is enriched when the auxiliary load is changed from ON to OFF, the opening control amount is corrected to a lower opening side for a predetermined time to reduce the purge air amount,
The enrichment is suppressed. It should be noted that the correction to the low opening side includes a correction to a fully closed value. In the invention described in claim 2 , the opening control amount correction means is configured to gradually return the opening control amount to a normal value after the predetermined time has elapsed.
【００１４】かかる構成によると、所定時間だけ低開度
側に補正すると、その後に、例えばそのときの吸入空気
量に対応する開度制御値である通常値にまで徐々に復帰
させ、急激なパージエア量の増大による空燃比変動を抑
止する。請求項３記載の発明では、前記開度制御量補正
手段が、補機負荷が増大変化したときに、前記開度制御
量をステップ的により高開度側に補正し、その後徐々に
通常値に復帰させる構成とした。According to this configuration, after the correction is made to the low opening side for a predetermined time, thereafter, it is gradually returned to, for example, the normal value which is the opening control value corresponding to the intake air amount at that time, and the sudden purge air Suppress fluctuations in the air-fuel ratio due to an increase in the amount. In the invention according to claim 3 , the opening control amount correction means corrects the opening control amount in a stepwise manner to a higher opening side when the accessory load increases and thereafter gradually returns to the normal value. It was configured to return.
【００１５】かかる構成によると、空燃比のリーン化が
生じる補機負荷の増大変化時に、パージ制御弁の開度を
増大補正して、パージエア量の増大を図る。そして、そ
の後、徐々に通常値（例えば吸入空気量に応じた値）に
復帰させる。請求項４記載の発明では、前記開度制御量
補正手段が、補機負荷が減少変化したときに、前記開度
制御量をステップ的により低開度側に補正し、その後徐
々に通常値に復帰させる構成とした。With this configuration, when the auxiliary load increases due to the leaning of the air-fuel ratio, the opening of the purge control valve is corrected to increase to increase the purge air amount. After that, it is gradually returned to a normal value (for example, a value corresponding to the intake air amount). In the invention according to claim 4 , the opening degree control amount correction means corrects the opening degree control amount to a lower opening side stepwise when the auxiliary load decreases, and thereafter gradually returns to the normal value. It was configured to return.
【００１６】かかる構成によると、空燃比のリッチ化が
生じる補機負荷の減少変化時に、パージ制御弁の開度を
減少補正して、パージエア量の減少を図る。そして、そ
の後、徐々に通常値（例えば吸入空気量に応じた値）に
復帰させる。請求項５記載の発明では、前記内燃機関
が、機関の燃焼室内に直接燃料を噴射する燃料噴射弁を
備えると共に、機関運転条件に応じ、燃焼方式を、少な
くとも、吸気行程にて燃料を噴射して行わせる均質燃焼
と、圧縮行程にて燃料を噴射して行わせる成層燃焼とに
切換制御する燃焼方式切換制御手段を備える構成とし
た。 かかる構成によると、均質燃焼と成層燃焼とが運転
条件に応じて切り換えられ、成層燃焼時には、点火栓回
りに集中的に層状の混合気を形成し、超リーン空燃比で
の燃焼を可能にする。 請求項６記載の発明では、前記補
機負荷検出手段が、補機負荷の有無を検出する構成であ
り、前記開度制御量補正手段が、補機負荷の有無の切り
換わりを補機負荷の変化として判断する構成とした。 か
かる構成によると、例えばエアコンスイッチのＯＮ・Ｏ
ＦＦに基づいて、補機負荷の変化を判断することにな
る。 請求項７記載の発明では、補機負荷の投入の有無に
応じてステップ的に機関の吸入空気量を変化させる空気
量制御手段を備え、前記補機負荷検出手段が、機関の吸
入空気量のステップ的な変化量に基づいて、補機負荷の
有無を検出する構成とした。 かかる構成によると、補機
負荷の投入の有無に応じて機関の吸入空気量を変化させ
るから、この空気量の変化が発生したか否かによって、
間接的に補機負荷の投入の有無を検出する。請求項８記
載の発明では、機関の吸入空気量に応じて前記開度制御
量の基本値を演算する基本開度演算手段を備え、前記開
度制御量補正手段が、前記基本値を補正するため補正係
数を設定して、前記開度制御量を補正する構成とした。With this configuration, when the load of the auxiliary equipment is reduced and the air-fuel ratio is enriched, the opening of the purge control valve is corrected to be reduced, thereby reducing the purge air amount. After that, it is gradually returned to a normal value (for example, a value corresponding to the intake air amount). In the invention described in claim 5, the internal combustion engine
Has a fuel injection valve that injects fuel directly into the combustion chamber of the engine.
And the combustion method should be reduced according to the engine operating conditions.
At least, homogeneous combustion is performed by injecting fuel during the intake stroke.
And stratified combustion in which fuel is injected during the compression stroke.
It is equipped with a combustion mode switching control means for switching control.
Was. According to this configuration, the homogeneous combustion and the stratified combustion operate.
It is switched according to the conditions.
Intensively to form a stratified air-fuel mixture, with super lean air-fuel ratio
Enables combustion. In the invention according to claim 6, the supplement
The machine load detecting means detects the presence or absence of an auxiliary machine load.
Thus, the opening degree control amount correction means determines whether or not there is an auxiliary load.
The switching is determined as a change in the auxiliary equipment load. Or
According to such a configuration, for example, ON / O of the air conditioner switch
Based on the FF, it is necessary to determine the change in the auxiliary equipment load.
You. According to the seventh aspect of the present invention, whether or not the auxiliary equipment load is turned on is determined.
Air that changes the intake air amount of the engine stepwise according to
Quantity control means, and the auxiliary equipment load detection means has an engine intake
Based on the stepwise change in the amount of incoming air,
It was configured to detect the presence or absence. According to such a configuration, the auxiliary machine
Change the intake air amount of the engine according to whether or not a load is applied.
Therefore, depending on whether or not this air amount change has occurred,
Indirectly detects the presence or absence of auxiliary load. In the invention of claim 8, further comprising a basic opening calculation means for calculating a basic value of the opening control amount according to the intake air amount of the engine, the opening control amount correction means for correcting the basic value Therefore, a configuration is adopted in which a correction coefficient is set to correct the opening control amount.
【００１７】かかる構成によると、開度制御量は通常吸
入空気量に応じて決定されるが、補機負荷に伴う空燃比
変化が予測されるときには、該空燃比変化を抑制する方
向に前記基本値を補正係数で補正する。請求項９記載の
発明では、前記開度制御量補正手段が、前記パージ制御
弁の開度制御量を補正する所定の運転条件を、低回転，
低負荷領域とする構成とした。According to this configuration, the opening control amount is normally determined according to the intake air amount. However, when a change in the air-fuel ratio due to the load of the auxiliary equipment is predicted, the basic control amount is set in a direction to suppress the change in the air-fuel ratio. Correct the value with the correction coefficient. According to the ninth aspect of the present invention, the opening degree control amount correction means sets a predetermined operating condition for correcting the opening degree control amount of the purge control valve to low rotation, low rotation,
The configuration is such that the load area is low.
【００１８】かかる構成によると、パージエアの遅れが
特に大きく影響する低回転，低負荷時（アイドルを含
む）の補機負荷変化時に開度制御量が補正される。According to this configuration, the opening control amount is corrected when the load of the auxiliary equipment changes at low rotation speed and low load (including idle) where the delay of the purge air has a particularly large effect.
【００１９】[0019]
【発明の効果】請求項１記載の発明によると、補機負荷
の変化に伴ってパージ制御弁の開度を減少補正すること
で、特に、補機負荷のＯＮ→ＯＦＦ時であってパージエ
アが遅れて供給されることによる空燃比のリッチ化が発
生するときに、前記リッチ化の原因となるパージエア量
を減らすことができ、以て、前記リッチ化を抑制して、
リッチ化による回転変動や失火の発生を防止できるとい
う効果がある。 According to the first aspect of the present invention, the auxiliary equipment load
To reduce the opening of the purge control valve in accordance with changes in
In particular, when the auxiliary load is ON → OFF and the purge
Air-fuel ratio enrichment caused by delayed supply
The amount of purge air that causes the enrichment when producing
Can be reduced, thereby suppressing the enrichment,
It can prevent rotation fluctuation and misfire caused by enrichment
Has the effect.
【００２０】[0020]
【００２１】請求項２記載の発明によると、リッチ化抑
止のためにパージ制御弁の開度を減少補正している状態
から、開度を通常値にまで徐々に復帰させて、開度を復
帰させるときの空燃比変動を抑止できるという効果があ
る。請求項３記載の発明によると、補機負荷の増大変化
により空燃比がリーン化するときに、パージ制御弁の増
大補正により前記リーン化を抑止でき、以て、リーン化
による回転変動やヘジテーションの発生を回避できると
いう効果がある。According to the second aspect of the invention, the opening is gradually returned to the normal value from the state in which the opening of the purge control valve is corrected to decrease in order to suppress the enrichment, and the opening is returned. There is an effect that the air-fuel ratio fluctuation at the time of the control can be suppressed. According to the third aspect of the present invention, when the air-fuel ratio becomes lean due to an increase in the load of auxiliary equipment, the leaning can be suppressed by increasing the correction of the purge control valve, so that rotation fluctuation and hesitation due to leaning can be suppressed. There is an effect that generation can be avoided.
【００２２】請求項４記載の発明によると、補機負荷の
減少変化により空燃比がリッチ化するときに、パージ制
御弁の減少補正により前記リッチ化を抑止でき、以て、
リッチ化による回転変動や失火の発生を回避できるとい
う効果がある。請求項５記載の発明によると、圧縮行程
中の燃料噴射によって成層燃焼を行わせる場合には、点
火栓回りの混合気の空燃比を精度良く制御するため、パ
ージ率の変動によって点火栓回りの混合気の空燃比の変
動を抑制でき、以て、失火や回転変動の発生を回避でき
るという効果がある。 請求項６記載の発明によると、補
機負荷の変化を、エアコンスイッチ等のＯＮ・ＯＦＦに
基づき簡便に検出できるという効果がある。 請求項７記
載の発明によると、補機負荷の変化を、吸入空気量の変
化から間接的に検出できるという効果がある。請求項８
記載の発明によると、パージ率を一定に制御しつつ、補
機負荷の変化時には、空燃比変化を抑制することができ
るという効果がある。According to the fourth aspect of the present invention, when the air-fuel ratio becomes rich due to a decrease in the load of the auxiliary equipment, the enrichment can be suppressed by correcting the decrease of the purge control valve.
There is an effect that rotation fluctuation and misfire due to enrichment can be avoided. According to the invention described in claim 5, the compression stroke
When stratified combustion is performed by fuel injection during
In order to accurately control the air-fuel ratio of the air-fuel mixture around the
Of the air-fuel ratio of the air-fuel mixture around the spark plug
Movements, thereby preventing misfires and rotation fluctuations.
There is an effect that. According to the invention described in claim 6,
Change of machine load to ON / OFF of air conditioner switch etc.
There is an effect that detection can be easily performed based on the above. Claim 7
According to the above-mentioned invention, the change in the auxiliary equipment load is
This has the effect that it can be indirectly detected from the conversion. Claim 8
According to the invention described above, there is an effect that it is possible to suppress the change in the air-fuel ratio when the load of the auxiliary equipment changes while controlling the purge rate to be constant.
【００２３】請求項９記載の発明によると、補機負荷の
変化による空燃比変動が特に大きくなるアイドル等の低
回転，低負荷時に、パージ制御弁の開度補正により前記
空燃比変動を効果的に抑制できるという効果がある。According to the ninth aspect of the present invention, the air-fuel ratio fluctuation can be effectively reduced by correcting the opening of the purge control valve at a low rotation speed and a low load such as idling where the air-fuel ratio fluctuation due to the change of the auxiliary equipment load becomes particularly large. The effect is that it can be suppressed.
【００２４】[0024]
【発明の実施の形態】以下に本発明の実施の形態を説明
する。図２は実施の形態を示す内燃機関のシステム図で
ある。この図２において、車両に搭載される内燃機関１
の各気筒の燃焼室には、エアクリーナ２から吸気通路３
により、電制スロットル弁４の制御を受けて、空気が吸
入される。Embodiments of the present invention will be described below. FIG. 2 is a system diagram of the internal combustion engine showing the embodiment. In FIG. 2, an internal combustion engine 1 mounted on a vehicle
The combustion chamber of each cylinder is provided with an intake passage 3 from an air cleaner 2.
Thus, air is sucked under the control of the electronically controlled throttle valve 4.
【００２５】そして、燃焼室内に燃料（ガソリン）を直
接噴射するように、電磁式の燃料噴射弁（インジェク
タ）５が設けられている。燃料噴射弁５は、コントロー
ルユニット２０から機関回転に同期して吸気行程又は圧
縮行程にて出力される噴射パルス信号によりソレノイド
に通電されて開弁し、所定圧力に調圧された燃料を噴射
するようになっている。そして、噴射された燃料は、吸
気行程噴射の場合は燃焼室内に拡散して均質な混合気を
形成し、また圧縮行程噴射の場合は点火栓６回りに集中
的に層状の混合気を形成し、コントロールユニット２０
からの点火信号に基づき、点火栓６により点火されて、
燃焼（均質燃焼又は成層燃焼）する。尚、燃焼方式は、
空燃比制御との組合わせで、均質ストイキ燃焼、均質リ
ーン燃焼（空燃比２０〜３０）、成層リーン燃焼（空燃
比４０程度）に運転条件に応じて分けられる（燃焼方式
切換制御手段）。An electromagnetic fuel injector (injector) 5 is provided so as to directly inject fuel (gasoline) into the combustion chamber. The fuel injection valve 5 is energized by a solenoid in response to an injection pulse signal output in an intake stroke or a compression stroke from the control unit 20 in synchronization with engine rotation, opens the valve, and injects fuel adjusted to a predetermined pressure. It has become. The injected fuel diffuses into the combustion chamber in the case of the intake stroke injection to form a homogeneous mixture, and in the case of the compression stroke injection, forms a stratified mixture around the ignition plug 6. , Control unit 20
Is ignited by the ignition plug 6 based on the ignition signal from
Combustion (homogeneous combustion or stratified combustion). The combustion method is
In combination with air-fuel ratio control, it is divided into homogeneous stoichiometric combustion, homogeneous lean combustion (air-fuel ratio of 20 to 30), and stratified lean combustion (air-fuel ratio of about 40) according to operating conditions (combustion method switching control means).
【００２６】機関１からの排気は排気通路７より排出さ
れ、排気通路７には排気浄化用の触媒８が介装されてい
る。また、燃料タンク９から発生する蒸発燃料を処理す
べく、蒸発燃料処理装置としてのキャニスタ１０が設け
られている。キャニスタ１０は、密閉容器内に活性炭な
どの吸着剤１１を充填したもので、燃料タンク９からの
蒸発燃料導入管１２が接続されている。従って、機関１
の停止中などに燃料タンク９にて発生した蒸発燃料は、
蒸発燃料導入管１２を通って、キャニスタ１０に導か
れ、ここに吸着捕集される。Exhaust gas from the engine 1 is exhausted from an exhaust passage 7, and an exhaust purification catalyst 8 is interposed in the exhaust passage 7. Further, a canister 10 is provided as an evaporative fuel processing device for processing the evaporative fuel generated from the fuel tank 9. The canister 10 is a sealed container filled with an adsorbent 11 such as activated carbon, and is connected to an evaporative fuel introduction pipe 12 from the fuel tank 9. Therefore, engine 1
Evaporated fuel generated in the fuel tank 9 during the stop of
The evaporative fuel is introduced into the canister 10 through the fuel introduction pipe 12 and is adsorbed and collected there.
【００２７】また、キャニスタ１０には、新気導入口１
３が形成されると共に、パージ通路１４が導出されてい
る。パージ通路１４はパージ制御弁１５を介して吸気通
路３のスロットル弁４下流（吸気マニホールド）に接続
されている。パージ制御弁１５は、コントロールユニッ
ト２０から機関１の運転中に所定の条件で出力される信
号により開弁するようになっている。従って、機関１が
始動されて、パージ許可条件が成立すると、パージ制御
弁１５が開き、機関１の吸入負圧がキャニスタ１０に作
用する結果、新気導入口１３から導入される空気によっ
てキャニスタ１０の吸着剤１１に吸着されていた蒸発燃
料が脱離（パージ）され、この脱離した蒸発燃料を含む
パージエアがパージ通路１４を通って吸気通路３のスロ
ットル弁４下流に吸入され、この後、機関１の燃焼室内
で燃焼処理される。The canister 10 has a fresh air inlet 1.
3, and a purge passage 14 is led out. The purge passage 14 is connected to the intake passage 3 downstream of the throttle valve 4 (intake manifold) via a purge control valve 15. The purge control valve 15 is opened by a signal output under predetermined conditions from the control unit 20 during operation of the engine 1. Accordingly, when the engine 1 is started and the purge permission condition is satisfied, the purge control valve 15 is opened, and the suction negative pressure of the engine 1 acts on the canister 10. As a result, the canister 10 is blown by the air introduced from the fresh air inlet 13. The evaporated fuel adsorbed by the adsorbent 11 is desorbed (purged), and purge air containing the desorbed evaporative fuel is sucked into the intake passage 3 downstream of the throttle valve 4 through the purge passage 14, and thereafter, The combustion is performed in the combustion chamber of the engine 1.
【００２８】コントロールユニット２０は、ＣＰＵ、Ｒ
ＯＭ、ＲＡＭ、Ａ／Ｄ変換器及び入出力インターフェイ
ス等を含んで構成されるマイコンを備え、各種センサか
らの入力信号を受け、これに基づいて演算処理して、燃
料噴射弁５、点火栓６及びパージ制御弁１５などの作動
を制御する。前記各種センサとしては、機関１のクラン
ク軸又はカム軸回転を検出するクランク角センサ２１，
２２が設けられている。これらのクランク角センサ２
１，２２は、気筒数をｎとすると、クランク角７２０°
／ｎ毎に、予め定めたクランク角位置（例えば圧縮上死
点前１１０°）で基準パルス信号ＲＥＦを出力すると共
に、１〜２°毎に単位パルス信号ＰＯＳを出力するもの
で、基準パルス信号ＲＥＦの周期などから機関回転数Ｎ
ｅを算出可能である。The control unit 20 includes a CPU, an R
A microcomputer including an OM, a RAM, an A / D converter, an input / output interface, and the like is provided. The microcomputer receives input signals from various sensors, performs arithmetic processing based on the input signals, And the operation of the purge control valve 15 and the like. The various sensors include a crank angle sensor 21 for detecting rotation of a crankshaft or a camshaft of the engine 1,
22 are provided. These crank angle sensors 2
1, 22 are 720 ° crank angle, where n is the number of cylinders.
/ N, outputs a reference pulse signal REF at a predetermined crank angle position (for example, 110 ° before compression top dead center) and outputs a unit pulse signal POS every 1 to 2 °. From the REF cycle etc., the engine speed N
e can be calculated.
【００２９】この他、吸気通路３のスロットル弁４上流
で吸入空気流量Ｑａを検出するエアフローメータ２３、
アクセルペダルの踏込み量（アクセル開度）ＡＰＳを検
出するアクセルセンサ２４、スロットル弁４の開度ＴＶ
Ｏを検出するスロットルセンサ２５（スロットル弁４の
全閉位置でＯＮとなるアイドルスイッチを含む）、機関
１の冷却水温Ｔｗを検出する水温センサ２６、排気通路
７にて排気空燃比のリッチ・リーンに応じた信号を出力
するＯ2 センサ２７、車速ＶＳＰを検出する車速センサ
２８などが設けられている。In addition, an air flow meter 23 for detecting the intake air flow rate Qa upstream of the throttle valve 4 in the intake passage 3,
An accelerator sensor 24 for detecting an accelerator pedal depression amount (accelerator opening) APS, an opening TV of the throttle valve 4
A throttle sensor 25 for detecting O (including an idle switch that is turned on when the throttle valve 4 is fully closed), a water temperature sensor 26 for detecting the cooling water temperature Tw of the engine 1, and a rich / lean exhaust air-fuel ratio in the exhaust passage 7. An O 2 sensor 27 that outputs a signal corresponding to the vehicle speed, a vehicle speed sensor 28 that detects a vehicle speed VSP, and the like are provided.
【００３０】更に、エアコンスイッチ，パワステスイッ
チ，ライトスイッチ，ラジエーターファンスイッチなど
である補機負荷スイッチ２９（補機負荷検出手段）から
のＯＮ・ＯＦＦ信号も、コントロールユニット２０に入
力されるようになっており、コントロールユニット２０
は、アイドル運転時等の低回転，低負荷領域で、補機負
荷スイッチ２９のＯＮ・ＯＦＦに基づき、補機負荷の投
入（ＯＮ）状態では、空気量を所定量だけ増大させて補
機負荷に対応し得る機関出力トルクを得るべく、前記電
制スロットル弁４の開度を制御する。Further, ON / OFF signals from an auxiliary load switch 29 (auxiliary load detecting means) such as an air conditioner switch, a power steering switch, a light switch, and a radiator fan switch are also input to the control unit 20. Control unit 20
In the low-rotation, low-load region such as during idling, the auxiliary load is increased by a predetermined amount when the auxiliary load is turned on (ON) based on the ON / OFF of the auxiliary load switch 29. The opening of the electronically controlled throttle valve 4 is controlled so as to obtain an engine output torque corresponding to the following.
【００３１】尚、スロットル弁４をバイパスする補助空
気通路に補助空気量制御弁を備え、前記補機負荷スイッ
チ２９のＯＮ・ＯＦＦに連動して、前記補助空気量制御
弁を開閉させる構成であっても良い。そして、前記コン
トロールユニット２０は、図３のフローチャートに示す
ようにして前記キャニスタ１０のパージを制御する。
尚、本実施の形態において、開度制御量補正手段として
の機能は、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20がソフトウェア的に備えている。An auxiliary air amount control valve is provided in an auxiliary air passage that bypasses the throttle valve 4, and the auxiliary air amount control valve is opened and closed in conjunction with ON / OFF of the auxiliary load switch 29. May be. The control unit 20 controls the purging of the canister 10 as shown in the flowchart of FIG.
In the present embodiment, the function as the opening control amount correction means is provided by software in the control unit 20, as shown in the flowchart of FIG.
【００３２】まず、Ｓ１では、吸入空気流量，スロット
ル開度，補機負荷スイッチのＯＮ・ＯＦＦなどの各種条
件を読み込む。Ｓ２では、補機負荷の状態を示すフラグ
＃ＦＳＬを判別する。前記フラグ＃ＦＳＬは初期状態で
は０がセットされ、補機負荷の変化が検出されると１又
は２がセットされる構成としてある。First, in S1, various conditions such as the intake air flow rate, throttle opening, and ON / OFF of an auxiliary load switch are read. In S2, a flag #FSL indicating the state of the auxiliary equipment load is determined. The flag #FSL is set to 0 in an initial state, and is set to 1 or 2 when a change in accessory load is detected.
【００３３】前記フラグ＃ＦＳＬに０がセットされてい
ると判断されたときには、Ｓ３へ進み、エアコン用コン
プレッサー，パワステ用ポンプ（図示省略）などの補機
負荷の有無を、前記補機負荷スイッチ２９のＯＮ・ＯＦ
Ｆに基づいて判断する。尚、スロットル弁４を迂回する
バイパス通路に設けた補助空気量制御弁を前記補機負荷
スイッチ２９に連動して開閉制御する構成（空気量制御
手段）を備える場合には、前記補機負荷スイッチ２９の
ＯＮ・ＯＦＦに基づいて補機負荷の有無を判断する代わ
りに、スロットル開度（及び／又はアクセル開度）一定
のときの吸入空気量が所定値以上にステップ的に変化し
たことをもって、補機負荷の有無の切り換えを判断する
ことが可能である。When it is determined that 0 is set in the flag #FSL, the program proceeds to S3, in which the presence or absence of an auxiliary load such as an air conditioner compressor or a power steering pump (not shown) is determined by the auxiliary load switch 29. ON ・ OF
Judge based on F. When the auxiliary air amount control valve provided in the bypass passage bypassing the throttle valve 4 is controlled to open and close in conjunction with the auxiliary load switch 29 (air amount control means), the auxiliary load switch Instead of judging the presence / absence of accessory load based on ON / OFF of 29, the fact that the intake air amount at a constant throttle opening (and / or accelerator opening) changes stepwise beyond a predetermined value, It is possible to determine whether to switch the presence or absence of the accessory load.
【００３４】Ｓ４では、補機負荷の変化があったか否
か、即ち、補機負荷スイッチ２９のＯＮ→ＯＦＦ又はＯ
ＦＦ→ＯＮ切り換え、又は、空気量のステップ的変化が
あったか否かを判別する。そして、補機負荷の変化が認
められたときには、Ｓ５へ進み、前記補記負荷の変化
が、補機負荷の有り（ＯＮ）→無し（ＯＦＦ）切り換え
であるか否かを判別する。At S4, it is determined whether or not the auxiliary load has changed, that is, whether the auxiliary load switch 29 has been turned ON → OFF or O.
It is determined whether or not FF → ON switching or a step change in the air amount has occurred. When a change in the auxiliary load is recognized, the process proceeds to S5, and it is determined whether or not the change in the supplementary load is a change from the presence (ON) to the absence (OFF) of the auxiliary load.
【００３５】補機負荷のＯＮ→ＯＦＦ切り換え時である
ときには、Ｓ６へ進み、前記フラグ＃ＦＳＬに１をセッ
トする。次のＳ７では、補機負荷のＯＮ→ＯＦＦ切り換
え時からの経過時間ｔに応じて、予め前記パージ制御弁
１５の制御デューティ（開度制御量）を補正するための
補正係数ｋ１を記憶したテーブルを参照し、その時の経
過時間ｔに対応する補正係数ｋ１を検索する。尚、本実
施の形態では、開度制御量としてのデューティの増大方
向が、パージ制御弁１５の開度増大方向に一致するもの
とする。If it is time to switch the auxiliary load from ON to OFF, the process proceeds to S6, where 1 is set to the flag #FSL. In the next step S7, a table storing a correction coefficient k1 for correcting the control duty (opening control amount) of the purge control valve 15 in advance in accordance with the elapsed time t from when the auxiliary load is switched from ON to OFF. To find a correction coefficient k1 corresponding to the elapsed time t at that time. In the present embodiment, it is assumed that the increasing direction of the duty as the opening control amount coincides with the increasing direction of the opening of the purge control valve 15.
【００３６】ここで、前記補正係数ｋ１は、補機負荷の
ＯＮ→ＯＦＦ切り換え時点において０に設定される一
方、その後徐々に1.0 に近づいて実質的に補正が行われ
ない状態に変化するようにしてあり、これにより、切り
換え時点においてはステップ的に開度をより低開度側
（全閉）に補正し、その後徐々に通常値に復帰するよう
になっている。Here, the correction coefficient k1 is set to 0 at the time when the auxiliary load is switched from ON to OFF, and thereafter gradually approaches 1.0 to change to a state in which substantially no correction is performed. Accordingly, at the time of switching, the opening is corrected stepwise to a lower opening side (fully closed), and thereafter gradually returns to the normal value.
【００３７】尚、補正係数ｋ１の初期値を０としたが、
1.0 未満で０を越える値を初期値としても良い。Ｓ８で
は、前記フラグ＃ＦＳＬのクリア条件の判別及びクリア
処理を行う。具体的には、前記補正係数ｋ１が最終的な
目標値（例えば1.0 ）にまで変化したとき、又は、補正
係数ｋ１による補正開始からの経過時間ｔが目標時間に
達したときに、クリア条件が成立したものと判断し、前
記フラグ＃ＦＳＬを０リセットする。Although the initial value of the correction coefficient k1 is set to 0,
A value less than 1.0 and greater than 0 may be set as the initial value. In step S8, the condition for clearing the flag #FSL is determined and a clearing process is performed. Specifically, when the correction coefficient k1 has changed to a final target value (for example, 1.0), or when the elapsed time t from the start of correction by the correction coefficient k1 has reached the target time, the clear condition is satisfied. It is determined that the condition is satisfied, and the flag #FSL is reset to 0.
【００３８】Ｓ９では、前記補正係数ｋ１を、最終的な
補正係数ｋにセットする。前記フラグ＃ＦＳＬに１がセ
ットされてから０リセットされるまでの間は、Ｓ２から
Ｓ１０へ進んで経過時間ｔをカウントアップさせた後Ｓ
７へ進み、補機負荷のＯＮ→ＯＦＦ切り換え時からの経
過時間ｔに応じて補正係数ｋ１が逐次更新される。In S9, the correction coefficient k1 is set to the final correction coefficient k. From the time when the flag #FSL is set to 1 until the flag #FSL is reset to 0, the process proceeds from S2 to S10 and the elapsed time t is counted up.
The process proceeds to step S7, and the correction coefficient k1 is sequentially updated according to the elapsed time t from the time when the auxiliary load is switched from ON to OFF.
【００３９】前述のように、補正係数ｋ１は、補機負荷
のＯＮ→ＯＦＦ切り換え時にステップ的に開度制御量
（デューティ）をより低開度側（全閉）に修正した後、
徐々に通常値に戻るように設定されるから、空気量の減
少変化に対してシリンダ内に吸引されるパージエア量の
減少が遅れる補機負荷のＯＮ→ＯＦＦ切り換え時に、遅
れてシリンダ内に供給されるパージエア量を減らし、以
て、空燃比のリッチ化を抑制する。従って、特に高精度
な空燃比制御が要求される成層燃焼時においても、点火
栓回りの空燃比制御精度を確保でき、以て、高い燃焼安
定性が得られる。As described above, the correction coefficient k1 is obtained by correcting the opening control amount (duty) stepwise to a lower opening side (fully closed) when the auxiliary load is switched from ON to OFF.
Since it is set to gradually return to the normal value, when the auxiliary load is switched from ON to OFF where the decrease in the amount of purge air sucked into the cylinder is delayed with respect to the decrease in the amount of air, the supply to the cylinder is delayed. The amount of purge air is reduced, thereby suppressing the enrichment of the air-fuel ratio. Therefore, even in the case of stratified charge combustion, in which high-precision air-fuel ratio control is particularly required, air-fuel ratio control accuracy around the spark plug can be ensured, and high combustion stability can be obtained.
【００４０】一方、Ｓ５で補機負荷の変化方向が、ＯＮ
→ＯＦＦでなくＯＦＦ→ＯＮであると判断されたときに
は、Ｓ５からＳ１１へ進む。Ｓ１１では、前記フラグ＃
ＦＳＬに２をセットし、次のＳ１２では、補機負荷のＯ
ＦＦ→ＯＮ切り換え時からの経過時間ｔに応じて、予め
前記パージ制御弁１５の制御デューティ（開度制御量）
を補正するための補正係数ｋ２を記憶したテーブルを参
照し、その時の経過時間ｔに対応する補正係数ｋ２を検
索する。On the other hand, in S5, the change direction of the auxiliary load becomes ON.
When it is determined that OFF → ON instead of → OFF, the process proceeds from S5 to S11. In S11, the flag #
FSL is set to 2, and in the next S12, the auxiliary equipment load O
The control duty (opening control amount) of the purge control valve 15 is determined in advance according to the elapsed time t from the time of switching from FF to ON.
The correction coefficient k2 corresponding to the elapsed time t at that time is searched for with reference to the table storing the correction coefficient k2 for correcting.
【００４１】ここで、前記補正係数ｋ２は、補機負荷の
ＯＦＦ→ＯＮ切り換え時点において1.0 よりも大きな値
に設定される一方、その後徐々に1.0 に近づいて実質的
に補正が行われない状態に変化するようにしてあり、こ
れにより、切り換え時点においてはステップ的に開度を
より高開度側に補正し、その後徐々に通常値に復帰する
ようになっている。Here, the correction coefficient k2 is set to a value larger than 1.0 at the time when the auxiliary load is switched from OFF to ON, and thereafter gradually approaches 1.0, so that the correction is substantially not performed. At the time of switching, the opening is corrected stepwise to a higher opening, and thereafter gradually returns to the normal value.
【００４２】次のＳ１３では、前記Ｓ８と同様にして、
前記フラグ＃ＦＳＬのクリア条件の判別及びクリア処理
を行う。そして、Ｓ１４では、前記補正係数ｋ２を、最
終的な補正係数ｋにセットする。前記フラグ＃ＦＳＬに
２がセットされてから０リセットされるまでの間は、Ｓ
２からＳ１５へ進んで経過時間ｔをカウントアップさせ
た後Ｓ１２へ進み、補機負荷のＯＦＦ→ＯＮ切り換え時
からの経過時間ｔに応じて補正係数ｋ２が逐次更新され
る。In the next S13, similarly to the above S8,
The clear condition of the flag #FSL is determined and the clear processing is performed. Then, in S14, the correction coefficient k2 is set to the final correction coefficient k. During the period from when the flag #FSL is set to 2 until it is reset to 0, S
The process proceeds from S2 to S15, where the elapsed time t is counted up, and then proceeds to S12, where the correction coefficient k2 is sequentially updated according to the elapsed time t from when the auxiliary load is switched from OFF to ON.
【００４３】前述のように、補正係数ｋ２は、補機負荷
のＯＦＦ→ＯＮ切り換え時にステップ的に開度制御量
（デューティ）をより高開度側に修正した後、徐々に通
常値に戻るように設定されるから、空気量の増大変化に
対してシリンダ内に吸引されるパージエア量の増大が遅
れる補機負荷のＯＦＦ→ＯＮ切り換え時に、シリンダ内
に供給されるパージエア量を増やし、以て、空燃比のリ
ーン化を抑制する。As described above, the correction coefficient k2 gradually returns to the normal value after correcting the opening control amount (duty) to a higher opening side in a stepwise manner when the auxiliary load is switched from OFF to ON. When the auxiliary load is switched from OFF to ON, where the increase in the amount of purge air sucked into the cylinder is delayed with respect to the increase in the amount of air, the amount of purge air supplied into the cylinder is increased. Suppress lean air-fuel ratio.
【００４４】上記のようにして補正係数ｋを決定する
と、Ｓ１７へ進み、吸入空気流量Ｑａに定数ＰＲＡＴＥ
を乗算して求めれる開度制御量（デューティ）の基本値
に（基本開度演算手段）、前記補正係数ｋを乗算して補
正し、開度制御量（デューティ）を決定する。補機負荷
の変化時でないときには、Ｓ４からＳ１６へ進んで、前
記補正係数ｋに1.0 をセットさせてからＳ１７へ進むこ
とにより、補正係数ｋによる補正が実質的に行われずに
基本値に従ってパージ制御弁１５が制御されるようにす
る。When the correction coefficient k is determined as described above, the process proceeds to S17, where the constant PRATE is added to the intake air flow rate Qa.
The basic value of the opening control amount (duty) obtained by multiplying by (basic opening calculating means) is corrected by multiplying by the correction coefficient k to determine the opening control amount (duty). When the load of the auxiliary equipment is not being changed, the process proceeds from S4 to S16, in which the correction coefficient k is set to 1.0 and then to S17, whereby the purge control is performed in accordance with the basic value without substantially performing the correction by the correction coefficient k. Valve 15 is controlled.
【００４５】図４のフローチャートは、パージ制御の第
２の実施形態を示すものである。まず、Ｓ２１では、前
記Ｓ１と同様に各種条件の読み込みを行う。Ｓ２２で
は、前記Ｓ３と同様にして補機負荷の検出を行う。Ｓ２
３では、補機負荷の変化（ＯＮ→ＯＦＦとＯＦＦ→ＯＮ
とのいずれか）があったか否かを判別し、補機負荷の変
化がないときには、Ｓ２４で補正係数ｋを1.0 としてＳ
２６へ進む。FIG. 4 is a flow chart showing a second embodiment of the purge control. First, in S21, various conditions are read in the same manner as in S1. In S22, the auxiliary equipment load is detected in the same manner as in S3. S2
In 3, the change of the auxiliary equipment load (ON → OFF and OFF → ON
Is determined, and if there is no change in the auxiliary equipment load, the correction coefficient k is set to 1.0 in S24 and S
Proceed to 26.
【００４６】一方、Ｓ２３で補機負荷の変化が判別され
たときには、Ｓ２５へ進み、補機負荷の変化から所定時
間の間、補正係数ｋを０とする処理を行う。但し、補正
係数ｋを０とするのではなく、1.0 未満の値をセットす
る構成としても良い。そして、Ｓ２６では、吸入空気流
量Ｑａに定数ＰＲＡＴＥを乗算して求めれる開度制御量
（デューティ）の基本値に、前記補正係数ｋを乗算して
補正し、開度制御量（デューティ）を決定する。On the other hand, when it is determined in S23 that the change in the accessory load has occurred, the process proceeds to S25, in which the correction coefficient k is set to 0 for a predetermined time after the change in the accessory load. However, the correction coefficient k may be set to a value less than 1.0 instead of 0. In S26, the basic value of the opening control amount (duty) obtained by multiplying the intake air flow rate Qa by the constant PRATE is corrected by multiplying by the correction coefficient k to determine the opening control amount (duty). I do.
【００４７】これにより、特に、パージエアが遅れて供
給されることによって空燃比がリッチ化する補機負荷の
ＯＮ→ＯＦＦ時に、前記図３のフローチャートに示した
第１の実施形態と同様にして、機関の空気量の減少変化
に対して遅れて供給されるパージエア量を減少させて空
燃比のリッチ化を回避できる。ここで、第２の実施形態
は、上記のように、特に補機負荷のＯＮ→ＯＦＦ時に有
効であるから、補機負荷のＯＮ→ＯＦＦ時に限って補正
係数ｋに０をセットする処理を実行させても良いが、補
機負荷変化の方向を限定せずに補正係数ｋの設定を行わ
せることで、制御内容を簡略化できる。Thus, particularly when the auxiliary load is turned on and off when the air-fuel ratio becomes rich due to the delayed supply of the purge air, as in the first embodiment shown in the flowchart of FIG. It is possible to avoid the enrichment of the air-fuel ratio by reducing the amount of purge air supplied with a delay with respect to the decrease in the amount of air in the engine. Here, as described above, the second embodiment is effective especially when the auxiliary load is turned on → off, and therefore, executes the processing of setting the correction coefficient k to 0 only when the auxiliary load is turned on → off. However, the control content can be simplified by setting the correction coefficient k without limiting the direction of the auxiliary equipment load change.
【００４８】尚、前記補正係数ｋに所定時間の間０をセ
ットした後は、直ちに1.0 に戻しても良いが、徐々に1.
0 に戻るようにすることが好ましい。また、上記各実施
の形態では、開度制御量（デューティ）を補正係数ｋに
よる乗算補正によって補正する構成としたが、補正量の
加減算によって開度制御量（デューティ）を補正しても
良いことは明らかである。After the correction coefficient k is set to 0 for a predetermined time, the correction coefficient k may be returned to 1.0 immediately.
It is preferable to return to 0. In the above embodiments, the opening control amount (duty) is corrected by multiplication correction using the correction coefficient k. However, the opening control amount (duty) may be corrected by addition and subtraction of the correction amount. Is clear.
【図１】本発明にかかる蒸発燃料処理装置の基本構成を
示すブロック図。FIG. 1 is a block diagram showing a basic configuration of an evaporative fuel processing apparatus according to the present invention.
【図２】実施の形態における内燃機関のシステム構成
図。FIG. 2 is a system configuration diagram of an internal combustion engine in the embodiment.
【図３】パージ制御の第１実施形態を示すフローチャー
ト。FIG. 3 is a flowchart illustrating a first embodiment of purge control.
【図４】パージ制御の第２実施形態を示すフローチャー
ト。FIG. 4 is a flowchart showing a second embodiment of the purge control.
【図５】従来のパージ制御の問題点を示すタイムチャー
ト。FIG. 5 is a time chart showing a problem of the conventional purge control.
１ 内燃機関 ３ 吸気通路 ４ スロットル弁 ５ 燃料噴射弁 ６ 点火栓 ９ 燃料タンク 10 キャニスタ 14 パージ通路 15 パージ制御弁 20 コントロールユニット 29 補機負荷スイッチ DESCRIPTION OF SYMBOLS 1 Internal combustion engine 3 Intake passage 4 Throttle valve 5 Fuel injection valve 6 Spark plug 9 Fuel tank 10 Canister 14 Purge passage 15 Purge control valve 20 Control unit 29 Auxiliary equipment load switch
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ Ｆ０２Ｄ 45/00 ３６６ Ｆ０２Ｄ 45/00 ３６６Ｆ (72)発明者 古性 賢也 神奈川県横浜市神奈川区宝町２番地 日 産自動車株式会社内 (56)参考文献 特開 平９−68069（ＪＰ，Ａ) 特開 平４−194354（ＪＰ，Ａ) 特開 昭61−232337（ＪＰ，Ａ) 特開 平４−72453（ＪＰ，Ａ) 実開 昭63−158573（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) F02M 25/08 301 F02D 41/02 301 F02D 41/02 325 F02D 41/04 335 F02D 45/00 366 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification code FI F02D 45/00 366 F02D 45/00 366F (72) Inventor Kenya Nissan Motor Co., Ltd. 2 Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa (56) References JP-A-9-68069 (JP, A) JP-A-4-194354 (JP, A) JP-A-61-232337 (JP, A) JP-A-4-72453 (JP, A) 63-158573 (JP, U) (58) Fields investigated (Int. Cl. 7 , DB name) F02M 25/08 301 F02D 41/02 301 F02D 41/02 325 F02D 41/04 335 F02D 45 / 00 366
Claims (9)
集するキャニスタと、該キャニスタから機関の吸気系へ
の蒸発燃料のパージ通路に介装されて蒸発燃料のパージ
量を制御するパージ制御弁とを備えてなる内燃機関の蒸
発燃料処理装置において、 補機負荷を検出する補機負荷検出手段と、 所定の運転条件において前記補機負荷検出手段で検出さ
れる補機負荷が変化したときに、前記パージ制御弁の開
度制御量を、前記補機負荷が変化してから所定時間にお
いてより低開度側に補正する開度制御量補正手段と、 を設けたことを特徴とする内燃機関の蒸発燃料処理装
置。1. A canister for adsorbing and collecting evaporative fuel generated in a fuel tank, and a purge control interposed in a purge passage for evaporative fuel from the canister to an intake system of an engine to control a purge amount of the evaporative fuel. An evaporative fuel processing device for an internal combustion engine, comprising: a valve for detecting an auxiliary load; and an auxiliary load detected by the auxiliary load detector under a predetermined operating condition. Then, the purge control valve is opened.
Degree control amount within a predetermined time after the change of the auxiliary equipment load.
And an opening control amount correction means for correcting the opening degree to a lower opening side .
経過後から前記開度制御量を徐々に通常値に復帰させる
ことを特徴とする請求項１記載の内燃機関の蒸発燃料処
理装置。2. An evaporative fuel processing apparatus for an internal combustion engine according to claim 1, wherein said opening control amount correction means gradually returns said opening control amount to a normal value after said predetermined time has elapsed. .
集するキャニスタと、該キャニスタから機関の吸気系へ
の蒸発燃料のパージ通路に介装されて蒸発燃料のパージ
量を制御するパージ制御弁とを備えてなる内燃機関の蒸
発燃料処理装置において、 補機負荷を検出する補機負荷検出手段と、 所定の運転条件において前記補機負荷検出手段で検出さ
れる補機負荷が増大変化したときに、前記パージ制御弁
の開度制御量を、ステップ的により高開度側に補正し、
その後徐々に通常値に復帰させる開度制御量補正手段
と、 を設けたことを特徴とする内燃機関の蒸発燃料処理装
置。3. A canister for adsorbing and collecting evaporated fuel generated in a fuel tank, and a purge control interposed in a purge passage of the evaporated fuel from the canister to an intake system of the engine to control a purge amount of the evaporated fuel. In the evaporative fuel processing apparatus for an internal combustion engine comprising a valve, an auxiliary load detecting means for detecting an auxiliary load, and an auxiliary load detected by the auxiliary load detecting means under predetermined operating conditions are increased and changed. Sometimes, the purge control valve
The opening control amount is corrected to a higher opening side stepwise,
An evaporative fuel processing apparatus for an internal combustion engine, comprising: an opening degree control amount correction unit that gradually returns to a normal value thereafter .
集するキャニスタと、該キャニスタから機関の吸気系へ
の蒸発燃料のパージ通路に介装されて蒸発燃料のパージ
量を制御するパージ制御弁とを備えてなる内燃機関の蒸
発燃料処理装置において、 補機負荷を検出する補機負荷検出手段と、 所定の運転条件において前記補機負荷検出手段で検出さ
れる補機負荷が減少変 化したときに、前記パージ制御弁
の開度制御量を、ステップ的により低開度側に補正し、
その後徐々に通常値に復帰させる開度制御量補正手段
と、 を設けたことを特徴とする内燃機関の蒸発燃料処理装
置。4. A canister for adsorbing and collecting evaporated fuel generated in a fuel tank, and a purge control interposed in a purge passage of the evaporated fuel from the canister to an intake system of an engine to control a purge amount of the evaporated fuel. in the evaporative fuel processing system for an internal combustion engine comprising a valve, auxiliary and accessory load detecting means for detecting the load, accessory load decrease change detected by the auxiliary load detecting means in a predetermined operating condition The purge control valve
The opening control amount is corrected stepwise to a lower opening side,
An evaporative fuel processing apparatus for an internal combustion engine, comprising: an opening degree control amount correction unit that gradually returns to a normal value thereafter .
料を噴射する燃料噴射弁を備えると共に、機関運転条件
に応じ、燃焼方式を、少なくとも、吸気行程にて燃料を
噴射して行わせる均質燃焼と、圧縮行程にて燃料を噴射
して行わせる成層燃焼とに切換制御する燃焼方式切換制
御手段を備えたことを特徴とする請求項１〜４のいずれ
か１つに記載の内燃機関の蒸発燃料処理装置。5. The internal combustion engine includes a fuel injection valve for directly injecting fuel into a combustion chamber of the engine, and performs a combustion method by injecting fuel at least in an intake stroke according to engine operating conditions. The internal combustion engine according to any one of claims 1 to 4, further comprising a combustion mode switching control unit that performs switching control between homogeneous combustion and stratified combustion in which fuel is injected in a compression stroke. Evaporative fuel processing equipment.
を検出する構成であり、前記開度制御量補正手段が、補
機負荷の有無の切り換わりを補機負荷の変化として判断
することを特徴とする請求項１〜５のいずれか１つに記
載の内燃機関の蒸発燃料処理装置。6. An auxiliary equipment load detecting means for detecting the presence or absence of an auxiliary equipment load, wherein said opening control amount correcting means determines a change in the presence or absence of an auxiliary equipment load as a change in the auxiliary equipment load. The evaporative fuel treatment apparatus for an internal combustion engine according to any one of claims 1 to 5, wherein
に機関の吸入空気量を変化させる空気量制御手段を備
え、前記補機負荷検出手段が、機関の吸入空気量のステ
ップ的な変化量に基づいて、補機負荷の有無を検出する
構成であることを特徴とする請求項１〜５のいずれか１
つに記載の内燃機関の蒸発燃料処理装置。7. An air supply control means for changing the intake air amount of the engine in a stepwise manner according to whether or not an auxiliary equipment load is applied. 6. The configuration according to claim 1, wherein the presence / absence of an auxiliary equipment load is detected based on the amount of change.
An evaporative fuel processing apparatus for an internal combustion engine according to any one of the preceding claims.
の基本値を演算する基本開度演算手段を備え、前記開度
制御量補正手段が、前記基本値を補正するため補正係数
を設定して、前記開度制御量を補正することを特徴とす
る請求項１〜７のいずれか１つに記載の内燃機関の蒸発
燃料処理装置。8. A basic opening calculating means for calculating a basic value of the opening control amount according to an intake air amount of the engine, wherein the opening control amount correcting means corrects the basic value by a correction coefficient. The evaporative fuel processing apparatus for an internal combustion engine according to any one of claims 1 to 7, wherein the opening control amount is corrected by setting the following.
御弁の開度制御量を補正する所定の運転条件を、低回
転，低負荷領域とすることを特徴とする請求項１〜８の
いずれか１つに記載の内燃機関の蒸発燃料処理装置。9. The system according to claim 1, wherein said opening control amount correction means sets a predetermined operating condition for correcting the opening control amount of said purge control valve to a low rotation and low load range. An evaporative fuel processing apparatus for an internal combustion engine according to any one of the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35083397A JP3337410B2 (en) | 1997-12-19 | 1997-12-19 | Evaporative fuel treatment system for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35083397A JP3337410B2 (en) | 1997-12-19 | 1997-12-19 | Evaporative fuel treatment system for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11182360A JPH11182360A (en) | 1999-07-06 |
| JP3337410B2 true JP3337410B2 (en) | 2002-10-21 |
Family
ID=18413202
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35083397A Expired - Fee Related JP3337410B2 (en) | 1997-12-19 | 1997-12-19 | Evaporative fuel treatment system for internal combustion engine |
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| Country | Link |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6253744B1 (en) | 1999-03-19 | 2001-07-03 | Unisia Jecs Corporation | Method and apparatus for controlling fuel vapor, method and apparatus for diagnosing fuel vapor control apparatus, and method and apparatus for controlling air-fuel ratio |
| JP2000274295A (en) | 1999-03-19 | 2000-10-03 | Unisia Jecs Corp | Idle rotation controller for internal combustion engine |
| JP2007077869A (en) * | 2005-09-14 | 2007-03-29 | Toyota Motor Corp | Air fuel ratio control device for internal combustion engine |
| JP5482464B2 (en) * | 2010-05-31 | 2014-05-07 | スズキ株式会社 | Air-fuel ratio control device for internal combustion engine for outboard motor |
| JP2015155648A (en) * | 2012-05-09 | 2015-08-27 | 日産自動車株式会社 | Engine control device and engine control method |
-
1997
- 1997-12-19 JP JP35083397A patent/JP3337410B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
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| JPH11182360A (en) | 1999-07-06 |
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