JPH0326862A - Self diagnosing device in fuel purging system for evaporated gas processor in fuel tank - Google Patents

Self diagnosing device in fuel purging system for evaporated gas processor in fuel tank

Info

Publication number
JPH0326862A
JPH0326862A JP16063589A JP16063589A JPH0326862A JP H0326862 A JPH0326862 A JP H0326862A JP 16063589 A JP16063589 A JP 16063589A JP 16063589 A JP16063589 A JP 16063589A JP H0326862 A JPH0326862 A JP H0326862A
Authority
JP
Japan
Prior art keywords
fuel
purge
pressure
purge line
intake passage
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.)
Granted
Application number
JP16063589A
Other languages
Japanese (ja)
Other versions
JP2900037B2 (en
Inventor
Chiaki Saito
斉藤 千晃
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nissan Motor Co Ltd
Original Assignee
Nissan Motor Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Priority to JP1160635A priority Critical patent/JP2900037B2/en
Publication of JPH0326862A publication Critical patent/JPH0326862A/en
Application granted granted Critical
Publication of JP2900037B2 publication Critical patent/JP2900037B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/08Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
    • F02M25/0809Judging failure of purge control system

Abstract

PURPOSE:To correctly and surely judge anomaly by judging the normalcy/ anomaly of a system on the basis of the booster pressure in an intake passage and the pressure in a purge line when a fuel purge region or the outside of the region is judged. CONSTITUTION:In a fuel purge region which is judged by a judging means B, a judging means A purges the fuel vapor which is adsorbed and caught into a canister into an intake passage, and in a no-fuel purge region, fuel purge is cut off. When fuel purge is executed or when fuel purge is suspended, the judging means A judges normalcy when the relation between the boost pressure inside an intake passage and the purge line pressure which are detected by the detecting means C and D is kept in a prescribed relation, while the judging means A judges anomaly when the prescribed relation is not kept. Thus, anomaly of the fuel purge system is judged correctly and surely, and reliability can be improved.

Description

【発明の詳細な説明】 く産業上の利用分野〉 本発明は、エンジンにおいて燃料タンク内に発生する燃
料ベーパ(以下、蒸発ガスと称する)を処理する装置に
おける燃料パージシステムの異常を検出するための自己
診断装置に関する。
[Detailed description of the invention] Industrial application field> The present invention is for detecting an abnormality in a fuel purge system in a device for processing fuel vapor (hereinafter referred to as evaporative gas) generated in a fuel tank of an engine. This invention relates to a self-diagnosis device.

く従来の技術〉 従来の燃料タンクの蒸発ガス処理装置における燃料パー
ジシステムとしては、例えば次のようなものがある(特
公昭53−19729号公報等参照). このものは、燃料タンク内の圧力が所定値以上の正圧に
なった時に、燃料タンク内の蒸発ガスをキャニスタに導
いて吸着捕集させ、該キャニスタに吸着された燃料をパ
ージラインを介して吸気通路に導入してエンジンに供給
するようにしている。
Prior Art> Examples of fuel purge systems in conventional fuel tank evaporative gas treatment devices include the following (see Japanese Patent Publication No. 53-19729, etc.). When the pressure inside the fuel tank reaches a positive pressure above a predetermined value, the evaporated gas inside the fuel tank is guided to a canister where it is adsorbed and collected, and the fuel adsorbed on the canister is passed through a purge line. It is introduced into the intake passage and supplied to the engine.

前記パージラインには、スロットル負圧に応じて開閉制
御されるダイヤフラム弁が介装されており、該ダイヤフ
ラム弁は予め定められた適切なパージ領域でエンジンへ
の燃料パージが行われるように制御される. 非パージ領域の一つとして、例えばアイドリング時やエ
ンジンキーオフ特等があり、この時にはダイヤフラム弁
を閉じ、パージ燃料量の供給を止めて燃料のオーバリッ
チ化を防止し、例えば始動性の悪化等が発生するのを防
止するようにしている. 〈発明が解決しようとする課題〉 しかしながら、上述のような従来の燃料パージシステム
にあっては、システムが正常に機能しているか否かを自
゜己診断する装置やプログラムが設けられていないため
、パージラインに詰まりが生じたり、パージラインを構
威する配管に亀裂等が生じて、パージが正常に行われな
い場合が発生する等のシステムの異常を掌握できず、装
置の信頼性に劣るという問題点があった. このため、従来では、パージラインを構威する配管を目
視する等してチェックするようにしているが、見落とし
等もあって、正確な異常判定を行えず、甚だ信頼性に劣
るものであった.そこで、本発明は以上のような従来の
問題点に鑑み、燃料パージシステムが正常に機能してい
るか否かを自己診断する装置を提供し、システムの異常
を確実正確に掌握可能とすることにより、装置の信頼性
の向上を図ることを目的とする.く課題を解決するため
の手段〉 このため、本発明の燃料タンクの蒸発ガス処理装置にお
ける燃料パージシステムの自己診断装置は、第1図に示
すように、燃料タンク内の蒸発ガスを吸着剤を充填した
蒸発ガス捕集用キャニスタに導いて吸着捕集させ、該キ
ャニスタに吸着された燃料を吸気通路の吸気絞り弁下流
にパージラインを介して導入させるようにした燃料タン
クの蒸発ガス処理装置における燃料パージシステムにお
いて、燃料パージの領域であるか否かを判別する手段と
、前記パージラインの圧力を検出する手段と、前記吸気
通路の前記パージ燃料導入部の下流側のブースト圧力を
検出若しくは演算する手段と、を設けると共に、これら
各検出手段から出力される検出信号により、燃料パージ
の領域若しくは該領域外であると判別された時の、前記
パージラインの圧力と前記ブースト圧力とに基づいてシ
ステムが正常であるか異常であるかを判定する判定手段
を設けた構威とする. 〈作用〉 かかる構或において、燃料パージ領域では、キャニスタ
内に吸着捕集された燃料がパージラインを介して吸気通
路に導入されエンジンに供給される. 一方、非燃料パージ領域では、キャニスタ内に吸着捕集
された燃料の供給が遮断される.ここで、燃料パージが
実行された場合或いは燃料パージが停止された場合に、
パージラインに詰まりゃ亀裂等が発生しておらずシステ
ムが正常であれば、ブースト圧力とパージライン圧力と
が所定の関係を保つ.逆に、パージラインに詰まりゃ亀
裂等が発生していてシステムが異常であれば、ブースト
圧力とパージライン圧力とが上記所定の関係を保たない
A diaphragm valve is installed in the purge line, and the diaphragm valve is controlled to open and close according to throttle negative pressure, and the diaphragm valve is controlled so that fuel is purged to the engine in a predetermined appropriate purge area. Ru. One of the non-purging areas is, for example, when the engine is idling or when the engine is keyed off. At this time, the diaphragm valve is closed and the supply of purge fuel is stopped to prevent fuel over-richness, which may cause, for example, poor startability. I am trying to prevent this from happening. <Problem to be solved by the invention> However, in the conventional fuel purge system as described above, there is no device or program for self-diagnosis to determine whether the system is functioning normally. , system abnormalities such as clogging in the purge line or cracks in the piping that constitutes the purge line, resulting in the purge not being performed properly, are not detected, and the reliability of the equipment is poor. There was a problem. For this reason, conventional methods have been to visually check the piping that constitutes the purge line, but this has led to oversights, and it has not been possible to accurately determine abnormalities, resulting in extremely low reliability. .. In view of the above-mentioned conventional problems, the present invention provides a device that self-diagnoses whether or not a fuel purge system is functioning normally, and makes it possible to reliably and accurately identify abnormalities in the system. The purpose is to improve the reliability of the equipment. Means for Solving the Problems> For this reason, the self-diagnosis device for the fuel purge system in the fuel tank evaporative gas treatment device of the present invention, as shown in FIG. In an evaporative gas treatment device for a fuel tank, the fuel is guided to a filled evaporative gas collecting canister and adsorbed and collected, and the fuel adsorbed in the canister is introduced into an intake passage downstream of an intake throttle valve via a purge line. In the fuel purge system, means for determining whether or not the area is a fuel purge area, means for detecting pressure in the purge line, and detecting or calculating boost pressure downstream of the purge fuel introduction part of the intake passage. and a means for detecting the fuel purge line based on the pressure of the purge line and the boost pressure when it is determined that the fuel purge area is in or outside the fuel purge area based on the detection signals output from each of the detection means. The system is designed to have a means of determining whether the system is normal or abnormal. <Operation> In this structure, in the fuel purge region, the fuel adsorbed and collected in the canister is introduced into the intake passage through the purge line and supplied to the engine. On the other hand, in the non-fuel purge area, the supply of fuel adsorbed and collected in the canister is cut off. Here, if fuel purge is executed or stopped,
If the purge line is clogged, there are no cracks, etc., and the system is normal, the boost pressure and purge line pressure will maintain a predetermined relationship. On the other hand, if the purge line is clogged, cracks, etc. have occurred and the system is abnormal, the boost pressure and purge line pressure will not maintain the above-described predetermined relationship.

従って、前記判定手段により、・燃料パージが実行され
た時或いは燃料パージが停止された時に、ブースト圧力
とパージライン圧力の関係が所定の関係を保つ場合に正
常と判定され、ブースト圧力とパージライン圧力の関係
が所定の関係を保たない場合に異常と判定される. く実施例〉 以下、本発明の実施例を図面に基づいて説明する. 第2図において、燃料タンクlとチェックバルブ2を介
装した連通路3を介して連通されるキャニスタ4の本体
4a内部には、上下にスクリーン5.6が配設され、こ
れらスクリーン5、6で挟まれた空間部に活性炭等の蒸
気ガス吸着剤7が充填されている.又、零体4a底部に
は、フレッシュエアの導入口8が形威され、該導入口8
から導入されたフレッシュエアは前記スクリーン6の下
側に配設されたフィルタ9と該スクリーン6を介して前
記空間部に導入される. このキャニスタ4と吸気絞り弁10下流の吸気通路11
aとはパージラインl2を介して連通され、キャニスタ
4に吸着捕集された燃料はこのパージライン12と吸気
通路11aとを介して図示しないエンジンに供給される
ようになっている.そして、上記パージライン12には
、スロットル負圧により開閉制御されて該ライン12を
開閉するダイヤフラム弁l3が介装されている.このダ
イヤフラム弁l3の本体13aは、キャニスタ4の本体
4aの上部に一体化戒形されている。この零体13a内
は該零体13a内に配設されたダイヤフラム13bを介
して2室A, Bに仕切られている。一方の室A内部に
は、ダイヤフラム13bを常時は弁閉状熊に付勢するス
プリング13cが備えられている. この室A内部はスロットル負圧導入通路14を介して吸
気絞り弁4の直上流の吸気通路1lbに連通される.こ
のスロットル負圧導入通路l4にはオン・オフされて開
閉動作されるソレノイド弁15が介装されている. 前記パージライン12を構或する配管12aの一端部は
吸気絞り弁4下流の吸気通路11aに連通され、他端部
はダイヤフラム弁本体13a壁に貫通支持されて他方の
室Bに開放され、その開放部はダイヤフラム13bに対
する弁シート部l6として機能するようになっている。
Therefore, the determination means determines that the relationship between the boost pressure and the purge line pressure is normal when the relationship between the boost pressure and the purge line pressure maintains a predetermined relationship when the fuel purge is executed or when the fuel purge is stopped; An abnormality is determined if the pressure relationship does not maintain the specified relationship. Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings. In FIG. 2, inside the main body 4a of the canister 4, which communicates with the fuel tank 1 through a communication passage 3 with a check valve 2 interposed therein, screens 5.6 are disposed above and below, and these screens 5, 6 The space between the two is filled with a vapor gas adsorbent 7 such as activated carbon. In addition, a fresh air inlet 8 is formed at the bottom of the zero body 4a, and the inlet 8
The fresh air introduced from the screen 6 is introduced into the space through the screen 6 and the filter 9 disposed below the screen 6. This canister 4 and the intake passage 11 downstream of the intake throttle valve 10
a is communicated with the canister 4 via a purge line 12, and the fuel adsorbed and collected in the canister 4 is supplied to an engine (not shown) via this purge line 12 and an intake passage 11a. A diaphragm valve l3 that opens and closes the line 12 is interposed in the purge line 12 and is controlled to open and close by the throttle negative pressure. The main body 13a of this diaphragm valve l3 is integrally formed on the upper part of the main body 4a of the canister 4. The interior of this zero body 13a is partitioned into two chambers A and B via a diaphragm 13b disposed within the zero body 13a. Inside one of the chambers A, a spring 13c is provided which normally biases the diaphragm 13b into a closed state. The inside of this chamber A is communicated with an intake passage 1lb immediately upstream of the intake throttle valve 4 via a throttle negative pressure introduction passage 14. A solenoid valve 15 that is turned on and off to open and close is installed in this throttle negative pressure introduction passage l4. One end of the piping 12a constituting the purge line 12 is communicated with the intake passage 11a downstream of the intake throttle valve 4, and the other end is supported through the wall of the diaphragm valve body 13a and is open to the other chamber B. The open portion functions as a valve seat portion l6 for the diaphragm 13b.

ここで、前記ダイヤフラム弁13は、吸気絞り弁10直
上流の吸気通路1lbが所定値以上の負圧(スロットル
負圧)となると開かれ、エンジンのアイドリング時並び
にエンジンの回転停止時等に、前記吸気通路1lbが所
定値未満の負圧(スロットル負圧)或いは大気圧となる
と閉じられて、適正な燃料パージ領域で燃料のパージを
行うようになっている. そして、前記ソレノイド弁15はこのダイヤフラム弁l
3の開閉に対応して開閉されるように制御される.この
制御はコントロールユニット17によって行う. 即ち、コントロールユニット17には、例えばエンジン
回転数と吸気絞り弁10下流のブースト圧力とによって
定められた燃料パージ領域と非燃料パージ領域のマップ
が備えられており、このマップに基づくコン}fff−
ルユニットl7からの指令により、ソレノイド弁15が
開閉制御されるようになっている. 上記のソレノイド弁15が、燃料パージの領域であるか
否かを判別する手段を構或する.ここで、吸気絞り弁1
0下流のブースト圧力を検出する手段としてのブースト
圧力計18と、パージラインl2を構戒する配管12a
内の圧力を検出する手段としてのパージライン圧力計1
9とが設けられている. 上記コントロールユニット17には、これらブースト圧
力計18とパージライン圧力計19とから夫々出力され
るブースト圧力信号とパージライン圧力信号とが入力さ
れている. そして、コントロールユニットl7は、上記ソレノイド
弁l5のオン・オフ信号と、ブースト圧力計18とパー
ジライン圧力計19とから夫々出力されるブースト圧力
信号とパージライン圧力信号とにより、燃料パージの領
域若しくは非パージ領域であると判別された時の、前記
ブースト圧力とパージライン圧力とに基づいてシステム
が正常であるか異常であるかを判定する判定手段を備え
ている. 次に、係る構或の作用について説明する。
Here, the diaphragm valve 13 is opened when the intake passage 1lb immediately upstream of the intake throttle valve 10 reaches a negative pressure (throttle negative pressure) of a predetermined value or more, and when the engine is idling or when the engine rotation is stopped, etc. When the intake passage 1lb reaches a negative pressure (throttle negative pressure) below a predetermined value or atmospheric pressure, it is closed, and the fuel is purged in an appropriate fuel purge area. The solenoid valve 15 is a diaphragm valve l.
It is controlled to open and close in response to the opening and closing of 3. This control is performed by a control unit 17. That is, the control unit 17 is equipped with a map of a fuel purge region and a non-fuel purge region determined by, for example, the engine speed and the boost pressure downstream of the intake throttle valve 10, and the control unit 17 is equipped with a map of a fuel purge region and a non-fuel purge region determined by, for example, the engine speed and the boost pressure downstream of the intake throttle valve 10.
The opening and closing of the solenoid valve 15 is controlled by commands from the unit 17. The solenoid valve 15 described above constitutes means for determining whether or not the area is a fuel purge area. Here, intake throttle valve 1
A boost pressure gauge 18 as a means for detecting the boost pressure downstream of 0, and a pipe 12a that monitors the purge line l2.
Purge line pressure gauge 1 as a means of detecting the internal pressure
9 is provided. The control unit 17 receives a boost pressure signal and a purge line pressure signal output from the boost pressure gauge 18 and the purge line pressure gauge 19, respectively. The control unit 17 controls the fuel purge area or the purge line pressure signal based on the on/off signal of the solenoid valve 15, and the boost pressure signal and purge line pressure signal output from the boost pressure gauge 18 and the purge line pressure gauge 19, respectively. A determining means is provided for determining whether the system is normal or abnormal based on the boost pressure and purge line pressure when it is determined that the system is in a non-purge area. Next, the operation of this structure will be explained.

燃料パージ領域では、ソレノイド弁l5は前述したマッ
プに基づくコントロールユニット17からの指令により
、開放制御される一方、吸気通路1lb内圧力が所定値
以上の負圧(スロットル負圧)となることで、この負圧
が通路l4を介してダイヤフラム弁l3の本体13a内
に作用し、ダイヤフラム13bをスプリング13cの弾
性力に抗して図の上方に移動変形させる.従って、ダイ
ヤフラム13bが弁シート部l6から離れ、パージライ
ン12が開通する.この結果、キャニスタ4内に吸着捕
集された燃料がパージラインl2を介して吸気通路11
aに導入されエンジンに供給される. 一方、非燃料パージ領域では、ソレノイド弁l5は前述
したマップに基づくコントロールユニット17からの指
令により閉塞制御される一方、吸気通路1lb内圧力が
所定値未満の負圧(スロットル負圧)或いは大気圧とな
ることで、ダイヤフラム13bがスプリング13cの弾
性力により図の下方に移動変形し、弁シート部l6に圧
着してパージラインl2を閉じる.この結果、キャニス
タ4内に吸着捕集された燃料の供給が遮断される.ここ
で、燃料パージが実行された場合或いは燃料パージが停
止された場合に、パージラインl2に詰まりゃ亀裂等が
発生しておらずシステムが正常であれば、ブースト圧力
とパージライン圧力とが所定の関係を保つ.逆に、パー
ジラインl2に詰まりゃ亀裂等が発生していてシステム
が異常であれば、ブースト圧力とパージライン圧力とが
上記所定の関係を保たない. 従って、前記コントロールユニットl2に備えた判定手
段により、燃料パージが実行された時或いは燃料パージ
が停止された時に、ブースト圧力とパージライン圧力の
関係が所定の関係を保つ場合に正常と判定され、ブース
ト圧力とパージライン圧力の関係が所定の関係を保たな
い場合に異常と判定される. これを第3図に示す判定ルーチンのフローチャートに基
づいて説明する. 図において、ステップ(以下、図と同様にSと称する)
lでは、ソレノイド弁l5がOFFか、OFFからON
になったかを判別し、OFFであればS2に進む. ここで、ソレノイド弁l5がOFF即ち、非パージ領域
でダイヤフラム弁l3が閉じられている時には、パージ
ライン圧力PPとブースト圧力P貫との関係は、PPζ
P.となるのが正常な状態である.しかし、例えばパー
ジライン圧力計l9と吸気通路11a間のパージライン
12に穴が開いている場合には、IP.l>IP,I>
O (大気圧)〔P,は大気圧に近い]となる.又、パ
ージライン圧力計19とキャニスタ4のパージラインl
2に穴が開いている場合若しくはパージライン圧計19
と吸気通路11a間のパージライン12に詰まりが生じ
ている場合には、IPII>IPPξ0(大気圧)〔P
,は殆ど大気圧〕となる.従って、S2では、P P 
’i P Hか否かを判定し、P,ζP,であれば、S
3に進んで正常判定を行い、P,一Pmでなければ、S
4に進んで異常判定を行う. 一方、SlでOFFからONになったことが判定される
と、S5に進む. ここで、ソレノイド弁l5がOFFからONになた時、
即ち、パージ領域でダイヤフラム弁l3が開かれている
時には、パージライン圧力PPとブースト圧力P.との
関係は、Pp’iP1からPa  l>IPP  I>
0 (大気圧)〔P,は大気圧に近い〕に変化するのが
正常な状態である.しかし、例えばパージライン圧力計
とキャニスタ4間のパージラインl2に詰まりが生じて
いる場合には、PP!=iP.から変化しない.又、パ
ージライン圧力計19と吸気通路11a間のパージライ
ンl2に穴が開いている場合には、P,ζP.からlp
s  l)IPP  l#0 (大気圧)(p,は殆ど
大気圧〕となる. 従って、S5では、P7ξP3がlPsl>IP,I>
Oに変化したか否かを判定し、lpg>IP,l>Oに
変化すれば、S3に進んで正常判定を行い、IPI  
l>IPP  l>Oに変化してければ、S4に進んで
異常判定を行う。
In the fuel purge region, the solenoid valve l5 is controlled to open according to a command from the control unit 17 based on the above-mentioned map, while the pressure inside the intake passage 1lb becomes negative pressure (throttle negative pressure) above a predetermined value. This negative pressure acts in the main body 13a of the diaphragm valve l3 through the passage l4, and moves and deforms the diaphragm 13b upward in the figure against the elastic force of the spring 13c. Therefore, the diaphragm 13b separates from the valve seat portion l6, and the purge line 12 opens. As a result, the fuel adsorbed and collected in the canister 4 is transferred to the intake passage 11 via the purge line l2.
a and is supplied to the engine. On the other hand, in the non-fuel purge region, the solenoid valve l5 is controlled to be closed by a command from the control unit 17 based on the above-mentioned map, while the pressure inside the intake passage 1lb is negative pressure (throttle negative pressure) less than a predetermined value or atmospheric pressure. As a result, the diaphragm 13b is moved and deformed downward in the figure by the elastic force of the spring 13c, and is pressed against the valve seat portion l6 to close the purge line l2. As a result, the supply of the fuel adsorbed and collected in the canister 4 is cut off. Here, when the fuel purge is executed or when the fuel purge is stopped, if the purge line l2 is clogged, there are no cracks, etc., and the system is normal, the boost pressure and purge line pressure will be at the predetermined level. Maintain the relationship. On the other hand, if the purge line 12 is clogged, cracks or the like have occurred, and the system is abnormal, the boost pressure and purge line pressure will not maintain the above-mentioned predetermined relationship. Therefore, the determination means provided in the control unit 12 determines that the condition is normal if the relationship between the boost pressure and the purge line pressure maintains a predetermined relationship when the fuel purge is executed or when the fuel purge is stopped. An abnormality is determined when the relationship between boost pressure and purge line pressure does not maintain the specified relationship. This will be explained based on the flowchart of the determination routine shown in FIG. In the figure, a step (hereinafter referred to as S as in the figure)
In l, solenoid valve l5 is OFF or turned from OFF to ON.
If it is OFF, proceed to S2. Here, when the solenoid valve l5 is OFF, that is, when the diaphragm valve l3 is closed in the non-purge area, the relationship between the purge line pressure PP and the boost pressure P is PPζ
P. This is the normal state. However, if there is a hole in the purge line 12 between the purge line pressure gauge 19 and the intake passage 11a, for example, the IP. l>IP,I>
O (atmospheric pressure) [P, is close to atmospheric pressure]. In addition, the purge line pressure gauge 19 and the purge line l of the canister 4
If there is a hole in 2 or purge line pressure gauge 19
If the purge line 12 between the intake passage 11a and the
, is almost atmospheric pressure]. Therefore, in S2, P P
'i P H or not, and if P, ζP, then S
Proceed to step 3 to determine normality, and if it is not P, 1Pm, S
Proceed to step 4 to determine the abnormality. On the other hand, if it is determined that Sl has changed from OFF to ON, the process advances to S5. Here, when the solenoid valve l5 turns from OFF to ON,
That is, when the diaphragm valve l3 is opened in the purge area, the purge line pressure PP and the boost pressure P. The relationship is from Pp'iP1 to Pal>IPP I>
The normal state is for the pressure to change to 0 (atmospheric pressure) [P, is close to atmospheric pressure]. However, if the purge line l2 between the purge line pressure gauge and the canister 4 is clogged, for example, PP! =iP. It does not change from . Furthermore, if there is a hole in the purge line l2 between the purge line pressure gauge 19 and the intake passage 11a, P, ζP. from lp
s l) IPP l#0 (atmospheric pressure) (p, is almost atmospheric pressure). Therefore, in S5, P7ξP3 is lPsl>IP,I>
It is determined whether or not it has changed to O, and if it has changed to lpg>IP, l>O, the process proceeds to S3, where a normal judgment is made and the IPI
If l>IPP l>O, the process advances to S4 and an abnormality determination is performed.

尚、上述のフローチャートに基づく、パージシステムの
正常・異常判定の基準を、次の表にまとめる. このようにして、パージシステムが異常と判定された場
合には、例えば、ランプや警報装置等の報知手段により
運転者等に知らせるようにII或すると良い. 以上のIIIfcによると、ブースト圧力とパージライ
ン圧力とによりパージシステムの自己診断を行うように
したから、パージライン12に詰まりが生じたり、パー
ジラインを構或する配管に亀裂等が生じて、パージが正
常に行われない場合が発生する等のシステムの異常を確
実、正確に掌握できるようになり、装置の信頼性の向上
を図ることができ、システムの異常時の対策を速やかに
行うことができる。
The following table summarizes the criteria for determining whether the purge system is normal or abnormal based on the above flowchart. In this way, if it is determined that the purge system is abnormal, it is preferable to notify the driver etc. by means of notification such as a lamp or an alarm device. According to IIIfc above, since self-diagnosis of the purge system is performed based on boost pressure and purge line pressure, if the purge line 12 becomes clogged or cracks occur in the piping that makes up the purge line, the purge This makes it possible to reliably and accurately grasp system abnormalities such as cases in which system operations are not performed normally, improving the reliability of the equipment, and promptly taking measures in the event of system abnormalities. can.

尚、以上の実施例においては、例えば機関回転数と吸気
絞り弁4下流の負圧とによって定められた燃料パージ領
域と非燃料パージ領域のマップに基づくコントロールユ
ニットl2からの指令により、開閉制御されるソレノイ
ド弁10により、燃料パージの領域であるか否かを判別
する手段を構威するようにしたが、この手段としては実
施例のものに限定されず、例えば、ダイヤフラム弁8に
ダイヤフラム8bの動作を検出するセンサ等を設けて、
燃料パージの開始を検出するように横或しても良いし、
パージ通路6に、機関運転状態等に基づいてデエーティ
ー制御されて弁関度制御される比例ソレノイド弁を介装
し、この比例ソレノイド弁へのデューティー制御信号に
より、燃料パージの開始を検出するように構威しても良
い。尚、デューティー制御信号が0からO以外に変化し
た時が、燃料パージの開始である. 又、本実施例においては、吸気通路にブースト圧力計を
介装してブースト圧力を直接検出する方法を採用したが
、スロットルセンサによって、アクセル開度(α)若し
くはインジエクタ噴射時間(TP )を検出し、予め前
記コントロールユニットに用意しておいた、(α,N)
→(PI ,N)若しくは(TF.N)→(P.,N)
(Nは回転数〕の換算マップから、ブースト圧力P.を
求めるようにしても良い. 〈発明の効果〉 以上説明したように、本発明に係る燃料パージシステム
の自己診断装置によると、燃料パージの領域若しくは非
領域であると判別された時の、吸気通路内ブースト圧力
とパージライン内圧力とに基づいてシステムが正常であ
るか異常であるかを判定するようにしたから、システム
の異常を確実、正確にIt握することが可能となり、シ
ステムの信頼性の向上を図ることができる有用性大なる
ものである。
In the above embodiment, opening and closing are controlled by commands from the control unit 12 based on a map of the fuel purge area and non-fuel purge area determined by, for example, the engine speed and the negative pressure downstream of the intake throttle valve 4. The solenoid valve 10 is used as a means for determining whether or not the area is a fuel purge area, but this means is not limited to the one in the embodiment. By installing sensors etc. that detect movement,
It may be horizontal to detect the start of fuel purge,
The purge passage 6 is provided with a proportional solenoid valve that is duty-controlled and valve duty controlled based on the engine operating state, etc., and the start of fuel purge is detected by a duty control signal to the proportional solenoid valve. It's okay to organize. Note that when the duty control signal changes from 0 to a value other than O, fuel purge begins. Furthermore, in this embodiment, a method was adopted in which a boost pressure gauge was installed in the intake passage to directly detect the boost pressure, but a throttle sensor was used to detect the accelerator opening (α) or the injector injection time (TP). (α, N) prepared in advance in the control unit.
→(PI,N) or (TF.N)→(P.,N)
(N is the number of revolutions) The boost pressure P. Since it is determined whether the system is normal or abnormal based on the boost pressure in the intake passage and the pressure in the purge line when it is determined that the system is in the range or non-region, it is possible to detect system abnormalities. This makes it possible to grasp the IT reliably and accurately, and is extremely useful in improving the reliability of the system.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明に係る燃料タンクの蒸発ガス処理装置に
おける燃料パージシステムの自己診斯装置のクレーム対
応図、第2図は同上装置の一実施例を示す構戒図、第3
図は同上実施例の作用を説明するフローチャートである
。 1・・・燃料タンク   4・・・キャニスタ11a・
・・ 吸気通路  12・・・パージラインl5・・・
ソレノイド弁  l7・・・コントロールユニ・〉ト 
 18・・・ブースト圧力計  19・・・パージライ
ン圧力計
Fig. 1 is a complaint correspondence diagram of a self-diagnosis device for a fuel purge system in a fuel tank evaporative gas treatment device according to the present invention, Fig. 2 is a composition diagram showing an embodiment of the same device, and Fig. 3
The figure is a flowchart for explaining the operation of the above embodiment. 1... Fuel tank 4... Canister 11a.
...Intake passage 12...Purge line l5...
Solenoid valve l7...Control unit
18...Boost pressure gauge 19...Purge line pressure gauge

Claims (1)

【特許請求の範囲】[Claims] 燃料タンク内の蒸発ガスを吸着剤を充填した蒸発ガス捕
集用キャニスタに導いて吸着捕集させ、該キャニスタに
吸着された燃料を吸気通路の吸気絞り弁下流にパージラ
インを介して導入させるようにした燃料タンクの蒸発ガ
ス処理装置における燃料パージシステムにおいて、燃料
パージの領域であるか否かを判別する手段と、前記パー
ジラインの圧力を検出する手段と、前記吸気通路の前記
パージ燃料導入部の下流側のブースト圧力を検出若しく
は演算する手段と、を設けると共に、これら各検出手段
から出力される検出信号により、燃料パージの領域若し
くは該領域外であると判別された時の、前記パージライ
ンの圧力と前記ブースト圧力とに基づいてシステムが正
常であるか異常であるかを判定する判定手段を設けたこ
とを特徴とする燃料タンクの蒸発ガス処理装置における
燃料パージシステムの自己診断装置。
The evaporative gas in the fuel tank is guided to an evaporative gas collecting canister filled with an adsorbent, where it is adsorbed and collected, and the fuel adsorbed in the canister is introduced into the intake passage downstream of the intake throttle valve via a purge line. In the fuel purge system in the evaporative gas treatment device for a fuel tank, the fuel purge system includes means for determining whether or not the area is a fuel purge area, means for detecting the pressure of the purge line, and the purge fuel introduction part of the intake passage. means for detecting or calculating the boost pressure on the downstream side of the purge line, and when it is determined that the area is in the fuel purge area or outside the fuel purge area based on the detection signals output from each of these detection means. 1. A self-diagnosis device for a fuel purge system in a fuel tank evaporative gas treatment device, characterized in that a determining means is provided for determining whether the system is normal or abnormal based on the pressure of the fuel and the boost pressure.
JP1160635A 1989-06-26 1989-06-26 Self-diagnosis device of fuel purge system in evaporative gas treatment device of fuel tank Expired - Lifetime JP2900037B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1160635A JP2900037B2 (en) 1989-06-26 1989-06-26 Self-diagnosis device of fuel purge system in evaporative gas treatment device of fuel tank

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1160635A JP2900037B2 (en) 1989-06-26 1989-06-26 Self-diagnosis device of fuel purge system in evaporative gas treatment device of fuel tank

Publications (2)

Publication Number Publication Date
JPH0326862A true JPH0326862A (en) 1991-02-05
JP2900037B2 JP2900037B2 (en) 1999-06-02

Family

ID=15719192

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
JP (1) JP2900037B2 (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5259355A (en) * 1991-04-08 1993-11-09 Nippondenso Co., Ltd. Gaseous fuel flow rate detecting system
US5259353A (en) * 1991-04-12 1993-11-09 Nippondenso Co., Ltd. Fuel evaporative emission amount detection system
US5284050A (en) * 1991-04-08 1994-02-08 Nippondenso Co., Ltd. Self-diagnosis apparatus in system for prevention of scattering of fuel evaporation gas
US5295472A (en) * 1992-01-06 1994-03-22 Toyota Jidosha Kabushiki Kaisha Apparatus for detecting malfunction in evaporated fuel purge system used in internal combustion engine
US5297527A (en) * 1991-12-28 1994-03-29 Suzuki Motor Corporation Diagnosing apparatus of evaporation fuel control system of vehicle
US5315980A (en) * 1992-01-17 1994-05-31 Toyota Jidosha Kabushiki Kaisha Malfunction detection apparatus for detecting malfunction in evaporative fuel purge system
US5317909A (en) * 1991-04-02 1994-06-07 Nippondenso Co., Ltd. Abnormality detecting apparatus for use in fuel transpiration prevention systems
US5333589A (en) * 1991-06-10 1994-08-02 Toyota Jidosha Kabushiki Kaisha Apparatus for detecting malfunction in evaporated fuel purge system
US5347971A (en) * 1992-06-08 1994-09-20 Nippondenso Co., Ltd. Apparatus for monitoring air leakage into fuel supply system for internal combustion engine
US5425344A (en) * 1992-01-21 1995-06-20 Toyota Jidosha Kabushiki Kaisha Diagnostic apparatus for evaporative fuel purge system
US5443051A (en) * 1993-02-26 1995-08-22 Toyota Jidosha Kabushiki Kaisha Apparatus for detecting a malfunction in an evaporated fuel purge system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0226754U (en) * 1988-08-10 1990-02-21

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0226754U (en) * 1988-08-10 1990-02-21

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5317909A (en) * 1991-04-02 1994-06-07 Nippondenso Co., Ltd. Abnormality detecting apparatus for use in fuel transpiration prevention systems
US5259355A (en) * 1991-04-08 1993-11-09 Nippondenso Co., Ltd. Gaseous fuel flow rate detecting system
US5284050A (en) * 1991-04-08 1994-02-08 Nippondenso Co., Ltd. Self-diagnosis apparatus in system for prevention of scattering of fuel evaporation gas
US5259353A (en) * 1991-04-12 1993-11-09 Nippondenso Co., Ltd. Fuel evaporative emission amount detection system
US5333589A (en) * 1991-06-10 1994-08-02 Toyota Jidosha Kabushiki Kaisha Apparatus for detecting malfunction in evaporated fuel purge system
US5297527A (en) * 1991-12-28 1994-03-29 Suzuki Motor Corporation Diagnosing apparatus of evaporation fuel control system of vehicle
US5295472A (en) * 1992-01-06 1994-03-22 Toyota Jidosha Kabushiki Kaisha Apparatus for detecting malfunction in evaporated fuel purge system used in internal combustion engine
US5315980A (en) * 1992-01-17 1994-05-31 Toyota Jidosha Kabushiki Kaisha Malfunction detection apparatus for detecting malfunction in evaporative fuel purge system
US5425344A (en) * 1992-01-21 1995-06-20 Toyota Jidosha Kabushiki Kaisha Diagnostic apparatus for evaporative fuel purge system
US5347971A (en) * 1992-06-08 1994-09-20 Nippondenso Co., Ltd. Apparatus for monitoring air leakage into fuel supply system for internal combustion engine
US5443051A (en) * 1993-02-26 1995-08-22 Toyota Jidosha Kabushiki Kaisha Apparatus for detecting a malfunction in an evaporated fuel purge system

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