JP2000110674A - Abnormality diagnostic device for evaporated gas purging system - Google Patents
Abnormality diagnostic device for evaporated gas purging systemInfo
- Publication number
- JP2000110674A JP2000110674A JP28281898A JP28281898A JP2000110674A JP 2000110674 A JP2000110674 A JP 2000110674A JP 28281898 A JP28281898 A JP 28281898A JP 28281898 A JP28281898 A JP 28281898A JP 2000110674 A JP2000110674 A JP 2000110674A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- evaporative gas
- tank
- purge system
- fuel
- 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
Links
Landscapes
- Testing Of Engines (AREA)
- 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、燃料タンク内の燃
料が蒸発して生じたエバポガス（燃料蒸発ガス）を内燃
機関の吸気管にパージ（放出）するエバポガスパージシ
ステムの異常診断を行うエバポガスパージシステムの異
常診断装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an evaporative gas purge system for diagnosing abnormalities of an evaporative gas purge system for purging (releasing) evaporative gas (fuel evaporative gas) generated by evaporating fuel in a fuel tank into an intake pipe of an internal combustion engine. The present invention relates to a system abnormality diagnosis device.
【０００２】[0002]
【従来の技術】従来より、エバポガスパージシステムに
おいては、燃料タンク内から発生するエバポガスが大気
中に漏れ出すことを防止するため、燃料タンク内のエバ
ポガスをエバポ通路を通してキャニスタ内に吸着すると
共に、このキャニスタ内に吸着されているエバポガスを
内燃機関の吸気管へパージするパージ通路の途中にパー
ジ制御弁を設け、内燃機関の運転状態に応じてパージ制
御弁の開閉を制御することによって、キャニスタから吸
気管へパージするエバポガスのパージ流量を制御するよ
うになっている。このエバポガスパージシステムから大
気中にエバポガスが漏れる異常が長期間放置されるのを
防止するために、エバポガスの漏れを早期に検出する必
要がある。2. Description of the Related Art Conventionally, in an evaporative gas purging system, in order to prevent evaporative gas generated in a fuel tank from leaking into the atmosphere, the evaporative gas in the fuel tank is adsorbed into a canister through an evaporative passage. A purge control valve is provided in the middle of a purge passage for purging evaporative gas adsorbed in the canister into an intake pipe of the internal combustion engine, and the opening and closing of the purge control valve is controlled in accordance with an operation state of the internal combustion engine. The purge flow rate of the evaporative gas to be purged to the pipe is controlled. It is necessary to detect the evaporative gas leakage early so as to prevent the evaporative gas purge system from leaking into the atmosphere abnormally for a long time.
【０００３】そこで、燃料タンク内の圧力（以下「タン
ク内圧力」という）を検出する圧力センサを設け、パー
ジ制御弁を開弁して吸気管から燃料タンク内に負圧を導
入した後、パージ制御弁を閉弁して、燃料タンクを含む
エバポガスパージ系を所定時間だけ密閉し、密閉期間開
始時のタンク内圧力と密閉期間終了時のタンク内圧力を
それぞれ圧力センサで検出し、後者から前者を差し引い
て、密閉期間内の圧力変化量を求め、この圧力変化量を
判定値と比較することでエバポガスパージ系のリーク
（漏れ）の有無を診断するようにしたものがある。この
場合、エバポガスパージ系にリークが無ければ、密閉期
間内の圧力変化量は、エバポガスの発生量に応じた値と
なり、判定値よりも小さくなるが、リークが発生してい
れば、負圧導入後の圧力変化量がリーク分だけ大きくな
り、判定値以上となる。Accordingly, a pressure sensor for detecting the pressure in the fuel tank (hereinafter referred to as "tank pressure") is provided, a purge control valve is opened, and a negative pressure is introduced from the intake pipe into the fuel tank. The control valve is closed, the evaporative gas purge system including the fuel tank is closed for a predetermined time, and the tank pressure at the start of the closed period and the tank pressure at the end of the closed period are respectively detected by the pressure sensors. Is subtracted to obtain the pressure change amount during the closed period, and the pressure change amount is compared with a determination value to diagnose the presence or absence of a leak (leak) in the evaporative gas purge system. In this case, if there is no leak in the evaporative gas purge system, the pressure change amount during the closed period becomes a value corresponding to the amount of evaporative gas generated and becomes smaller than the determination value. The subsequent pressure change amount increases by the amount of the leak, and becomes equal to or larger than the determination value.
【０００４】[0004]
【発明が解決しようとする課題】ところで、負圧導入後
にパージ制御弁を閉弁すると、エバポガスパージ系内へ
の負圧の導入は遮断されるが、その直前に導入されたパ
ージ制御弁付近の負圧が燃料タンク内に達してエバポガ
スパージ系全体の圧力が平均化されるまでの暫くの間
は、圧力センサで検出するタンク内圧力が下がり続ける
（図５参照）。このため、従来のように、密閉期間終了
時のタンク内圧力から密閉期間開始時のタンク内圧力を
差し引いて圧力変化量を測定すると、密閉期間内の圧力
変化量の測定値が実際よりも小さくなってしまい、その
分、異常診断精度が低下するという欠点がある。When the purge control valve is closed after the introduction of the negative pressure, the introduction of the negative pressure into the evaporative gas purge system is interrupted. For a while until the negative pressure reaches the inside of the fuel tank and the pressure of the entire evaporative gas purge system is averaged, the tank pressure detected by the pressure sensor continues to decrease (see FIG. 5). Therefore, when the pressure change is measured by subtracting the tank pressure at the start of the sealing period from the pressure at the end of the sealing period as in the related art, the measured value of the pressure change during the sealing period is smaller than the actual value. Therefore, there is a disadvantage that the accuracy of abnormality diagnosis is reduced accordingly.
【０００５】そこで、密閉期間中にタンク内圧力の変化
方向を判定し、圧力変化方向が低下方向から上昇方向に
逆転した時（つまりタンク内圧力が最低圧力になった
時）から圧力変化量の測定を開始し、所定時間経過後の
タンク内圧力から最低圧力を差し引くことで、圧力変化
量を測定して、その測定値に基づいて該エバポガスパー
ジ系のリークの有無を診断することが提案されている。Therefore, the direction of change of the pressure in the tank is determined during the closed period, and the amount of change in the pressure from the time when the pressure change direction reverses from the decreasing direction to the increasing direction (that is, when the pressure in the tank becomes the minimum pressure) is determined. It is proposed to start the measurement, subtract the minimum pressure from the pressure in the tank after a predetermined time has elapsed, measure the amount of pressure change, and diagnose whether there is a leak in the evaporative gas purge system based on the measured value. ing.
【０００６】しかし、悪路走行時や急ハンドル操作時
等、燃料タンク内の燃料の揺れが大きくなるときには、
圧力センサで検出するタンク内圧力が燃料タンク内の燃
料の揺れによって変動するため、その影響で、密閉期間
中の最低圧力を誤検出してしまう。このため、密閉期間
内の最低圧力を検出して圧力変化量を測定する方法で
も、最低圧力の誤検出により圧力変化量の測定精度が低
下してしまい、やはり、異常診断精度が低下するという
欠点がある。However, when the fuel in the fuel tank is greatly shaken, for example, when driving on a rough road or operating a sharp steering wheel,
Since the pressure in the tank detected by the pressure sensor fluctuates due to the fluctuation of the fuel in the fuel tank, the minimum pressure during the sealing period is erroneously detected due to the influence. For this reason, even in the method of measuring the pressure change amount by detecting the minimum pressure in the closed period, the accuracy of measuring the pressure change amount is reduced due to erroneous detection of the minimum pressure, and also the abnormality diagnosis accuracy is reduced. There is.
【０００７】本発明はこのような事情を考慮してなされ
たものであり、従ってその目的は、エバポガスパージ系
の異常診断時に、燃料タンク内の燃料の揺れによって生
じるエバポガスパージ系の圧力変動の影響を受けずに圧
力変化量を精度良く測定することができて、エバポガス
パージ系の異常を精度良く診断することができるエバポ
ガスパージシステムの異常診断装置を提供することにあ
る。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and therefore has as its object the effect of pressure fluctuations in the evaporative gas purge system caused by fuel fluctuations in the fuel tank when an abnormality is diagnosed in the evaporative gas purge system. It is an object of the present invention to provide an abnormality diagnosis apparatus for an evaporative gas purge system that can accurately measure a pressure change amount without receiving the abnormality and can accurately diagnose an abnormality of an evaporative gas purge system.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するため
に、本発明の請求項１のエバポガスパージシステムの異
常診断装置は、負圧導入制御手段により、パージ制御弁
を開弁してエバポガスパージ系に吸気管から負圧を導入
し、該パージ制御弁を閉弁して該エバポガスパージ系を
密閉し、この密閉期間中に該エバポガスパージ系内の圧
力を検出し、該圧力が最低圧力になってから所定圧力だ
け上昇した時点から所定期間内の圧力変化量を測定し
て、その測定値に基づいて該エバポガスパージ系の異常
診断を異常診断手段により行う。According to a first aspect of the present invention, there is provided an abnormality diagnosis apparatus for an evaporative gas purge system, comprising: opening a purge control valve by negative pressure introduction control means; A negative pressure is introduced into the system from the intake pipe, the purge control valve is closed to close the evaporative gas purge system, and the pressure in the evaporative gas purge system is detected during the closed period, and the pressure is reduced to the minimum pressure. Then, the amount of pressure change within a predetermined period from the time when the pressure has increased by a predetermined pressure is measured, and abnormality diagnosis of the evaporative gas purge system is performed by abnormality diagnosis means based on the measured value.
【０００９】このようにすれば、悪路走行時や急ハンド
ル操作時等、燃料タンク内の燃料の揺れが大きくなった
ときに、エバポガスパージ系内の圧力が瞬間的に上昇し
たとしても、その圧力上昇幅が所定圧力に達する前（圧
力変化量を測定するための所定期間が開始する前）にエ
バポガスパージ系内の圧力が再び低下し始めるため、最
低圧力の誤検出を未然に防止できる。この結果、悪路走
行時や急ハンドル操作時等でも、密閉期間中に最低圧力
になってから所定圧力だけ上昇した時点を正確に検出で
きて、その時点から所定期間内の圧力変化量を精度良く
測定することができ、エバポガスパージ系の異常診断を
精度良く行うことができる。With this configuration, even when the pressure in the evaporative gas purge system increases instantaneously when the fuel in the fuel tank is greatly shaken, for example, when driving on a rough road or when operating a sharp steering wheel, it is possible to prevent the fuel pressure from increasing. Before the pressure rise width reaches the predetermined pressure (before the predetermined period for measuring the pressure change starts), the pressure in the evaporative gas purge system starts to decrease again, so that erroneous detection of the minimum pressure can be prevented. As a result, even when driving on a rough road or operating a sharp steering wheel, it is possible to accurately detect the point in time when the pressure has risen by a predetermined pressure after reaching the minimum pressure during the sealing period, and to accurately determine the amount of pressure change within a predetermined period from that time. Measurement can be performed well, and abnormality diagnosis of the evaporative gas purge system can be performed accurately.
【００１０】この場合、請求項２のように、負圧導入終
了時から前記所定期間開始時までの圧力変化量と、負圧
導入終了時から前記所定期間終了時までの圧力変化量と
を測定し、後者から前者を差し引くことで前記所定期間
内の圧力変化量を算出するようにしても良い。このよう
にすれば、負圧導入終了時の圧力を基準にして所定期間
内の圧力変化量を精度良く検出することができる。In this case, the pressure change from the end of the introduction of the negative pressure to the start of the predetermined period and the pressure change from the end of the introduction of the negative pressure to the end of the predetermined period are measured. Then, the pressure change amount within the predetermined period may be calculated by subtracting the former from the latter. In this way, it is possible to accurately detect the amount of pressure change within a predetermined period based on the pressure at the end of the introduction of the negative pressure.
【００１１】[0011]
【発明の実施の形態】［実施形態（１）］以下、本発明
の実施形態（１）を図１乃至図５に基づいて説明する。
まず、図１に基づいてシステム全体の概略構成を説明す
る。内燃機関であるエンジン１１の吸気管１２の上流側
にはエアクリーナ１３が設けられ、このエアクリーナ１
３を通過した空気がスロットルバルブ１４を通してサー
ジタンク１５に流入し、吸気マニホールド１６からエン
ジン１１の各気筒に吸入される。各気筒の吸気マニホー
ルド１６には、燃料噴射弁１７が設けられている。各燃
料噴射弁１７には、燃料タンク１８内の燃料が燃料ポン
プ（図示せず）により燃料配管（図示せず）を介して送
られてくる。[Embodiment (1)] An embodiment (1) of the present invention will be described below with reference to FIGS.
First, a schematic configuration of the entire system will be described with reference to FIG. An air cleaner 13 is provided upstream of an intake pipe 12 of an engine 11 which is an internal combustion engine.
The air that has passed through 3 flows into the surge tank 15 through the throttle valve 14, and is drawn into each cylinder of the engine 11 from the intake manifold 16. A fuel injection valve 17 is provided in the intake manifold 16 of each cylinder. The fuel in the fuel tank 18 is supplied to each fuel injection valve 17 via a fuel pipe (not shown) by a fuel pump (not shown).
【００１２】次に、エバポガスパージシステム２０の構
成を説明する。燃料タンク１８には、エバポ通路２１を
介してキャニスタ２２が接続されている。このキャニス
タ２２内には、エバポガス（燃料蒸発ガス）を吸着する
活性炭等の吸着体（図示せず）が収容されている。ま
た、キャニスタ２２の底面部の大気連通孔には、大気に
連通する大気連通管２３が設けられ、この大気連通管２
３には大気開閉弁２４が取り付けられている。Next, the configuration of the evaporation gas purge system 20 will be described. A canister 22 is connected to the fuel tank 18 via an evaporation passage 21. The canister 22 contains an adsorbent (not shown) such as activated carbon that adsorbs evaporative gas (fuel evaporative gas). An atmosphere communication pipe 23 communicating with the atmosphere is provided in the atmosphere communication hole at the bottom of the canister 22.
An atmospheric on-off valve 24 is attached to 3.
【００１３】この大気開閉弁２４は、常開型の電磁弁に
より構成され、通電がオフされている状態では、開弁状
態に保持されて、キャニスタ２２の大気連通管２３が大
気に開放された状態に保たれる。この大気開閉弁２４
は、通電すると、閉弁し、大気連通管２３が閉塞された
状態になる。The atmosphere opening / closing valve 24 is constituted by a normally-open solenoid valve. When the power is turned off, the atmosphere opening / closing valve 24 is kept open and the atmosphere communication pipe 23 of the canister 22 is opened to the atmosphere. Kept in state. This atmosphere on-off valve 24
When energized, the valve is closed and the atmosphere communication pipe 23 is closed.
【００１４】一方、キャニスタ２２と吸気管１２のサー
ジタンク１５との間には、キャニスタ２２内の吸着体に
吸着されているエバポガスを吸気管１２にパージ（放
出）するためのパージ通路２５が設けられ、このパージ
通路２５の途中に、パージ流量を調整するパージ制御弁
２６が設けられている。このパージ制御弁２６は、常閉
型の電磁弁により構成され、通電をデューティ制御する
ことで、キャニスタ２２から吸気管１２へのエバポガス
のパージ流量を制御するようになっている。On the other hand, between the canister 22 and the surge tank 15 of the intake pipe 12, a purge passage 25 for purging (releasing) the evaporative gas adsorbed by the adsorbent in the canister 22 to the intake pipe 12 is provided. A purge control valve 26 for adjusting a purge flow rate is provided in the middle of the purge passage 25. The purge control valve 26 is constituted by a normally closed solenoid valve, and controls the purge flow rate of the evaporative gas from the canister 22 to the intake pipe 12 by duty control of energization.
【００１５】また、燃料タンク１８には、その内圧を検
出する圧力センサ２７が設けられている。燃料タンク１
８内からパージ制御弁２６までのエバポガスパージ系が
密閉されている時には、燃料タンク１８の内圧とエバポ
ガスパージ系の他の部位の内圧が一致するため、圧力セ
ンサ２７により燃料タンク１８の内圧を検出すること
で、エバポガスパージ系の圧力を検出することができ
る。The fuel tank 18 is provided with a pressure sensor 27 for detecting its internal pressure. Fuel tank 1
When the evaporative gas purge system from the inside 8 to the purge control valve 26 is closed, the internal pressure of the fuel tank 18 and the internal pressure of other parts of the evaporative gas purge system match, so the internal pressure of the fuel tank 18 is detected by the pressure sensor 27. Thus, the pressure of the evaporation gas purge system can be detected.
【００１６】この圧力センサ２７の出力信号は、エンジ
ン制御回路２８に読み込まれる。このエンジン制御回路
２８は、マイクロコンピュータを主体として構成され、
そのＲＯＭ（記憶媒体）に記憶された燃料噴射制御プロ
グラム、点火制御プログラム及びパージ制御プログラム
を実行することで、燃料噴射制御、点火制御及びパージ
制御を行う。更に、エンジン制御回路２８は、ＲＯＭに
記憶された図２乃至図４に示すエバポガスパージ系異常
診断用のプログラムを実行することで、エバポガスパー
ジ系のリークの有無を診断し、エバポガスパージ系のリ
ークを検出した時には、警告ランプ２９を点灯して運転
者に警告する。The output signal of the pressure sensor 27 is read into an engine control circuit 28. The engine control circuit 28 is mainly composed of a microcomputer,
The fuel injection control, the ignition control, and the purge control are performed by executing the fuel injection control program, the ignition control program, and the purge control program stored in the ROM (storage medium). Further, the engine control circuit 28 executes a program for diagnosing an abnormality in the evaporative gas purge system shown in FIGS. 2 to 4 stored in the ROM, thereby diagnosing the presence or absence of a leak in the evaporative gas purge system. Is detected, the warning lamp 29 is turned on to warn the driver.
【００１７】ここで、このエバポガスパージ系異常診断
用のプログラムによって行う診断手順を図５のタイムチ
ャートに基づいて概略的に説明する。異常診断実行条件
が成立したときに、キャニスタ２２の大気開閉弁２４を
閉弁した後、パージ制御弁２６を開弁してエバポガスパ
ージ系内に吸気管１２から負圧を導入し、圧力センサ２
７で検出した燃料タンク１８内の圧力（タンク内圧力）
が所定の負圧（例えば−１５ｍｍＨｇ）まで低下した時
点で、パージ制御弁２６を閉弁してエバポガスパージ系
を密閉する。これにより、エバポガスパージ系内への負
圧の導入は遮断されるが、その直前に導入されたパージ
制御弁２６付近の負圧が燃料タンク１８内に達してエバ
ポガスパージ系全体の圧力が平均化されるまでの暫くの
間は、圧力センサ２７で検出する燃料タンク１８内の圧
力（タンク内圧力）が下がり続ける。Here, a diagnosis procedure performed by the evaporative gas purge system abnormality diagnosis program will be schematically described with reference to a time chart of FIG. When the condition for executing the abnormality diagnosis is satisfied, after closing the atmospheric on-off valve 24 of the canister 22, the purge control valve 26 is opened to introduce a negative pressure from the intake pipe 12 into the evaporative gas purge system, and the pressure sensor 2
Pressure in fuel tank 18 detected in 7 (pressure in tank)
When the pressure drops to a predetermined negative pressure (for example, −15 mmHg), the purge control valve 26 is closed to close the evaporative gas purge system. As a result, the introduction of the negative pressure into the evaporative gas purge system is shut off, but the negative pressure near the purge control valve 26 introduced immediately before reaches the inside of the fuel tank 18 so that the pressure of the entire evaporative gas purge system is averaged. For a while, the pressure in the fuel tank 18 (in-tank pressure) detected by the pressure sensor 27 continues to decrease.
【００１８】そこで、密閉期間中にタンク内圧力の変化
方向を判定して、最低圧力Ｐmin を検出し、この最低圧
力Ｐmin から所定圧力ΔＰ０だけ上昇した時点を検出す
る。ここで、所定圧力ΔＰ０は、悪路走行時や急ハンド
ル操作時等、燃料タンク１８内の燃料の揺れが大きくな
ったときに発生するタンク内圧力の上昇量よりも大きい
値、例えば２ｍｍＨｇに設定されている。そして、最低
圧力Ｐmin から所定圧力ΔＰ０だけ上昇した時点から所
定時間（例えば１５ｓｅｃ）の測定区間内の圧力変化量
ΔＰを測定して、この圧力変化量ΔＰを判定値と比較す
ることでエバポガスパージ系の異常診断を行う。この後
は、大気開閉弁２４を開弁して、通常のパージ制御に復
帰する。Therefore, the direction of change of the pressure in the tank is determined during the closed period, the minimum pressure Pmin is detected, and the point of time when the minimum pressure Pmin is increased by a predetermined pressure ΔP0 is detected. Here, the predetermined pressure ΔP0 is set to a value larger than the amount of increase in the pressure in the tank that occurs when the fuel in the fuel tank 18 fluctuates greatly, such as when driving on a rough road or when operating a sharp steering wheel, for example, 2 mmHg. Have been. The evaporative gas purge system is measured by measuring the pressure change ΔP in a measurement section for a predetermined time (for example, 15 sec) from the time when the predetermined pressure ΔP0 has risen from the minimum pressure Pmin, and comparing the pressure change ΔP with a determination value. Diagnose abnormalities. Thereafter, the atmospheric on-off valve 24 is opened to return to the normal purge control.
【００１９】以上説明したエバポガスパージ系の異常診
断は、図２乃至図４に示すプログラムによって次のよう
に実施される。図２に示すタンク内圧検出プログラム
は、所定時間毎に起動される。本プログラムが起動され
ると、まずステップ１０１で、圧力センサ２７の出力を
Ａ／Ｄ変換してタンク内圧力Ｐ(i) を読み込む。この
後、ステップ１０２で、タンク内圧力Ｐ(i) を次式によ
りなまし処理して、本プログラムを終了する。 Ｐ(i) ＝Ｐ(i) ×１／４＋Ｐ(i-1) ×３／４ ここで、Ｐ(i) は今回値、Ｐ(i-1) は前回値である。
尚、上式は、１／４なまし処理であるが、例えば、１／
３なまし処理、１／５なまし処理、１／６なまし処理
等、なまし係数を適宜変更しても良いことは言うまでも
ない。The abnormality diagnosis of the evaporative gas purge system described above is carried out as follows by the programs shown in FIGS. The tank internal pressure detection program shown in FIG. 2 is started every predetermined time. When the program is started, first, in step 101, the output of the pressure sensor 27 is A / D converted to read the tank pressure P (i). Thereafter, in step 102, the tank internal pressure P (i) is smoothed by the following equation, and the program ends. P (i) = P (i) × １ ／ + P (i−1) × 3/4 Here, P (i) is the current value, and P (i−1) is the previous value.
Note that the above equation is a 1/4 smoothing process.
It goes without saying that the averaging coefficient such as 3 averaging, 1/5 averaging, 1/6 averaging, etc. may be changed as appropriate.
【００２０】一方、図３及び図４に示す異常診断プログ
ラムは、所定時間毎（例えば１６ｍｓｅｃ毎）に起動さ
れ、特許請求の範囲でいう異常診断手段としての役割を
果たす。本プログラムが起動されると、まずステップ２
０１で、異常診断実行条件が成立しているか否かを判定
する。この異常診断実行条件はエンジン運転状態が安定
しているときに成立し、例えば吸入空気量、吸気温、始
動後の経過時間、空燃比フィードバック中であるか否か
等によって判定する。もし、異常診断実行条件が成立し
ていなければ、以降の処理を行うことなく、本プログラ
ムを終了する。On the other hand, the abnormality diagnosis program shown in FIGS. 3 and 4 is started every predetermined time (for example, every 16 msec) and plays a role as abnormality diagnosis means in the claims. When this program is started, first step 2
At 01, it is determined whether or not the abnormality diagnosis execution condition is satisfied. This abnormality diagnosis execution condition is satisfied when the engine operation state is stable, and is determined based on, for example, the intake air amount, the intake air temperature, the elapsed time after starting, and whether or not the air-fuel ratio feedback is being performed. If the abnormality diagnosis execution condition is not satisfied, the program ends without performing the subsequent processing.
【００２１】これに対し、異常診断実行条件が成立して
いる場合には、ステップ２０２に進み、キャニスタ２２
の大気開閉弁２４を開弁し、次のステップ２０２で、測
定区間フラグＸが０であるか否か（つまり圧力変化量Δ
Ｐの測定区間の前か否か）を判定する。この測定区間フ
ラグＸは、イグニッションスイッチのオン直後（電源投
入直後）の初期化処理によってＸ＝０にリセットされ
る。On the other hand, if the abnormality diagnosis execution condition is satisfied, the routine proceeds to step 202, where the canister 22
At step 202, it is determined whether or not the measurement section flag X is 0 (that is, the pressure change amount Δ
Before the P measurement interval). The measurement section flag X is reset to X = 0 by an initialization process immediately after the ignition switch is turned on (immediately after the power is turned on).
【００２２】測定区間フラグＸ＝０の場合には、ステッ
プ２０４に進み、タンク内圧力Ｐが−１５ｍｍＨｇ以下
であるか否かを判定する。この際、タンク内圧力Ｐは、
図２のステップ１０２で求めたなまし値Ｐ(i) が用いら
れる（以降の処理でもタンク内圧力Ｐはなまし値Ｐ(i)
が用いられる）。もし、タンク内圧力Ｐが−１５ｍｍＨ
ｇよりも高ければ、ステップ２０５に進み、パージ制御
弁２６のデューティを例えば２０％に設定することで、
パージ制御弁２６を開弁して、エバポガスパージ系内に
吸気管１２から負圧を導入し、次のステップ２０６で、
現在の圧力Ｐを圧力記憶値Ｐ０としてＲＡＭに記憶し、
本プログラムを終了する。If the measurement section flag X = 0, the routine proceeds to step 204, where it is determined whether or not the tank pressure P is equal to or lower than -15 mmHg. At this time, the tank pressure P is
The smoothing value P (i) obtained in step 102 of FIG. 2 is used (the tank pressure P is also the smoothing value P (i) in the subsequent processing).
Is used). If the tank pressure P is -15mmH
If it is higher than g, the routine proceeds to step 205, where the duty of the purge control valve 26 is set to, for example, 20%.
The purge control valve 26 is opened to introduce a negative pressure from the intake pipe 12 into the evaporative gas purge system.
The current pressure P is stored in the RAM as a pressure storage value P0,
Exit this program.
【００２３】以上の処理により、測定区間フラグＸ＝０
の期間中は、タンク内圧力Ｐが−１５ｍｍＨｇ以下にな
るまで、パージ制御弁２６を開弁状態に維持して、エバ
ポガスパージ系内に負圧を導入し続け、圧力記憶値Ｐ０
を現在の圧力Ｐで順次更新していく。そして、負圧導入
終了直前に更新された圧力記憶値Ｐ０が以降の処理で負
圧導入終了時のタンク内圧力Ｐ０として用いられる。By the above processing, the measurement section flag X = 0
During the period of, the purge control valve 26 is maintained in the open state until the tank pressure P becomes equal to or lower than −15 mmHg, and the negative pressure is continuously introduced into the evaporative gas purge system.
Are sequentially updated with the current pressure P. Then, the stored pressure value P0 updated immediately before the end of the introduction of the negative pressure is used as the tank pressure P0 at the end of the introduction of the negative pressure in the subsequent processing.
【００２４】その後、タンク内圧力Ｐが−１５ｍｍＨｇ
以下になった時点で、ステップ２０７に進み、パージ制
御弁２６のデューティを０％に切り換えて、パージ制御
弁２６を閉弁し、エバポガスパージ系を密閉して負圧導
入を終了する。上記ステップ２０２〜２０７の処理が特
許請求の範囲でいう負圧導入制御手段として機能する。
その後、ステップ２０８で、負圧導入終了から例えば３
０ｓｅｃ経過したか否かを判定し、まだ、３０ｓｅｃ経
過していなければ、ステップ２０９に進み、現在のタン
ク内圧力Ｐが例えば１ｓｅｃ前のタンク内圧力Ｐold よ
りも所定圧力ΔＰ０（例えば２ｍｍＨｇ）以上上昇した
か否かを判定し、所定圧力ΔＰ０以上上昇していなけれ
ば、そのまま本プログラムを終了する。After that, the tank pressure P becomes -15 mmHg.
At this point, the routine proceeds to step 207, where the duty of the purge control valve 26 is switched to 0%, the purge control valve 26 is closed, the evaporative gas purge system is closed, and the introduction of the negative pressure is terminated. The processing of steps 202 to 207 functions as a negative pressure introduction control means described in the claims.
Thereafter, in step 208, for example, 3
It is determined whether 0 sec has elapsed or not, and if 30 sec has not yet elapsed, the process proceeds to step 209, where the current tank pressure P rises, for example, by a predetermined pressure ΔP0 (for example, 2 mmHg) more than the tank pressure Pold one second before. It is determined whether or not the operation has been performed, and if the pressure has not increased by the predetermined pressure ΔP0 or more, the present program is terminated as it is.
【００２５】もし、現在のタンク内圧力Ｐが１ｓｅｃ前
のタンク内圧力Ｐold よりも所定圧力ΔＰ０以上上昇し
ていれば、１ｓｅｃ前のタンク内圧力Ｐold を最低圧力
Ｐmin と判断し、ステップ２１０に進み、負圧導入終了
時から測定区間開始時までの圧力変化量（以下「第１の
圧力変化量」という）ΔＰ１を現在のタンク内圧力Ｐか
ら負圧導入終了時のタンク内圧力Ｐ０を差し引いて求め
る。この後、ステップ２１１で、測定区間フラグＸを
「１」にセットして圧力変化量ΔＰの測定区間（所定期
間）を開始する。これにより、最低圧力Ｐmin から所定
圧力ΔＰ０だけ上昇した時点から圧力変化量ΔＰの測定
区間が開始される。If the current tank pressure P is higher than the tank pressure Pold one second before by a predetermined pressure ΔP0 or more, it is determined that the tank pressure Pold one second before is the minimum pressure Pmin, and the routine proceeds to step 210. The pressure change amount ΔP1 from the end of negative pressure introduction to the start of the measurement section (hereinafter referred to as “first pressure change amount”) ΔP1 is obtained by subtracting the tank pressure P0 at the end of negative pressure introduction from the current tank pressure P. Ask. Thereafter, in step 211, the measurement section flag X is set to "1" to start the measurement section (predetermined period) of the pressure change amount ΔP. Thus, the measurement section of the pressure change amount ΔP is started from the time when the predetermined pressure ΔP0 has risen from the minimum pressure Pmin.
【００２６】尚、負圧導入終了から３０ｓｅｃ経過する
までに、最低圧力Ｐmin が検出されない場合（Ｐ−Ｐol
d ≧ΔＰ０とならない場合）には、異常診断時間が長く
なり過ぎて好ましくないため、ステップ２１２に進み、
キャニスタ２２の大気開閉弁２４を開弁して異常診断を
終了し、通常のパージ制御に復帰する。When the minimum pressure Pmin is not detected by 30 seconds after the end of the introduction of the negative pressure (P-Pol
If d ≧ ΔP0), the abnormality diagnosis time becomes too long, which is not preferable.
The atmospheric opening / closing valve 24 of the canister 22 is opened to terminate the abnormality diagnosis and return to the normal purge control.
【００２７】一方、測定区間開始後は、図４のステップ
２１３に進み、測定区間開始から所定時間（例えば１５
ｓｅｃ）が経過したか否かを判定し、所定時間が経過し
ていなければ、以降の処理を行わずに、本プログラムを
終了する。On the other hand, after the start of the measurement section, the process proceeds to step 213 in FIG.
It is determined whether or not (sec) has elapsed. If the predetermined time has not elapsed, the program is terminated without performing the subsequent processing.
【００２８】その後、所定時間が経過した時点で、測定
区間終了と判断して、ステップ２１４に進み、負圧導入
終了時から測定区間終了時までの圧力変化量（以下「第
２の圧力変化量」という）ΔＰ２を現在のタンク内圧力
Ｐから負圧導入終了時のタンク内圧力Ｐ０を差し引いて
求め、次のステップ２１５で、測定区間内の圧力変化量
ΔＰを第２の圧力変化量ΔＰ２から第１の圧力変化量Δ
Ｐ１を差し引いて求める。この後、ステップ２１６で、
測定区間内の圧力変化量ΔＰを判定値と比較して、エバ
ポガスパージ系のリークの有無を診断する。この際、圧
力変化量ΔＰは燃料タンク１８内の燃料残量に応じて若
干変化するため、判定値は、燃料タンク１８内の燃料残
量に応じてマップ等により設定することが好ましいが、
簡易的に固定値としても良い。Thereafter, when a predetermined time has elapsed, it is determined that the measurement section has ended, and the routine proceeds to step 214, where the pressure change amount from the end of the introduction of the negative pressure to the end of the measurement section (hereinafter referred to as the "second pressure change amount"). ) Is obtained by subtracting the tank pressure P0 at the end of the introduction of the negative pressure from the current tank pressure P, and in the next step 215, the pressure change amount ΔP in the measurement section is calculated from the second pressure change amount ΔP2. First pressure change amount Δ
Calculate by subtracting P1. Thereafter, in step 216,
The pressure change amount ΔP in the measurement section is compared with a determination value to determine whether or not there is a leak in the evaporative gas purge system. At this time, since the pressure change amount ΔP slightly changes according to the remaining fuel amount in the fuel tank 18, the determination value is preferably set by a map or the like according to the remaining fuel amount in the fuel tank 18,
A fixed value may be used simply.
【００２９】もし、測定区間内の圧力変化量ΔＰが判定
値以下であれば、ステップ２１８に進み、正常（リーク
無し）と判定するが、圧力変化量ΔＰが判定値よりも大
きければ、ステップ３１７に進み、異常（リーク有り）
と判定し、警告ランプ２９を点灯すると共に、異常コー
ドや異常時の運転状態を不揮発性メモリ（図示せず）に
記憶する。この後、ステップ２１９で、キャニスタ２２
の大気開閉弁２４を開弁して異常診断を終了し、通常の
パージ制御に復帰する。If the pressure change .DELTA.P in the measurement section is equal to or smaller than the determination value, the process proceeds to step 218, where it is determined that the pressure change is normal (no leak). If the pressure change .DELTA.P is larger than the determination value, step 317 is performed. To abnormal (leakage)
Is determined, the warning lamp 29 is turned on, and the abnormality code and the operating state at the time of abnormality are stored in a non-volatile memory (not shown). Thereafter, in step 219, the canister 22
Is opened to open the air opening / closing valve 24 to terminate the abnormality diagnosis and return to the normal purge control.
【００３０】ところで、負圧導入後のエバポガスパージ
系の密閉期間中は、タンク内圧力Ｐが最低圧力Ｐmin ま
で低下し続けるが、その間に、悪路走行や急ハンドル操
作等により燃料タンク１８内の燃料の揺れが大きくなる
と、図５に点線で示すようにタンク内圧力Ｐが瞬間的に
上昇することがある。このため、従来の異常診断方法で
は、燃料タンク１８内の燃料の揺れによる瞬間的な圧力
上昇により、最低圧力Ｐmin を誤検出してしまうことが
ある。Incidentally, while the evaporative gas purge system is closed after the introduction of the negative pressure, the pressure P in the tank continues to decrease to the minimum pressure Pmin. When the fluctuation of the fuel increases, the pressure P in the tank may increase instantaneously as shown by a dotted line in FIG. For this reason, in the conventional abnormality diagnosis method, the minimum pressure Pmin may be erroneously detected due to an instantaneous pressure increase due to the fluctuation of the fuel in the fuel tank 18.
【００３１】これに対し、本実施形態（１）では、タン
ク内圧力Ｐが最低圧力Ｐmin になってから所定圧力ΔＰ
０（例えば２ｍｍＨｇ）だけ上昇した時点から所定時間
内の圧力変化量ΔＰを測定して、この圧力変化量ΔＰを
判定値と比較することでエバポガスパージ系の異常診断
を行うようにしたので、悪路走行時や急ハンドル操作時
等に燃料タンク１８内の燃料の揺れによってタンク内圧
力Ｐが瞬間的に上昇したとしても、その圧力上昇幅が所
定圧力ΔＰ０に達する前（測定区間の開始前）にタンク
内圧力Ｐが再び低下し始めるため、最低圧力Ｐmin の誤
検出を未然に防止できる。この結果、悪路走行時や急ハ
ンドル操作時等でも、密閉期間中に最低圧力Ｐmin にな
ってから所定圧力ΔＰ０だけ上昇した時点、つまり測定
区間の開始タイミングを正確に判定することができて、
測定期間内の圧力変化量ΔＰを精度良く測定することが
でき、エバポガスパージ系の異常診断を精度良く行うこ
とができる。On the other hand, in this embodiment (1), after the tank pressure P has reached the minimum pressure Pmin, the predetermined pressure ΔP
Since the pressure change amount ΔP within a predetermined time from the time when the pressure rises by 0 (for example, 2 mmHg) is measured, and the pressure change amount ΔP is compared with a determination value, abnormality diagnosis of the evaporative gas purge system is performed. Even if the pressure P in the tank increases instantaneously due to the fluctuation of the fuel in the fuel tank 18 when the vehicle is traveling on a road or operating a sharp steering wheel, before the pressure increase reaches a predetermined pressure ΔP0 (before the start of the measurement section). Since the pressure P in the tank starts to decrease again, erroneous detection of the minimum pressure Pmin can be prevented. As a result, even when driving on a rough road or when operating a sharp steering wheel, it is possible to accurately determine the time when the pressure has increased by a predetermined pressure ΔP0 after the minimum pressure Pmin has been reached during the sealing period, that is, the start timing of the measurement section,
The pressure change amount ΔP during the measurement period can be accurately measured, and the abnormality diagnosis of the evaporative gas purge system can be accurately performed.
【００３２】特に、本実施形態（１）では、圧力センサ
２７で検出したタンク内圧力Ｐをなまし処理するように
したので、燃料タンク１８内の燃料の揺れによるタンク
内圧力Ｐの瞬間的な変動をなまし処理により１ｍｍＨｇ
程度に抑えることができる。このため、悪路走行時や急
ハンドル操作時等でも、燃料タンク１８内の燃料の揺れ
によるタンク内圧力Ｐの上昇量が確実に所定圧力ΔＰ０
（例えば２ｍｍＨｇ）よりも小さくなり、最低圧力Ｐmi
n の誤検出を確実に防止できる。しかも、燃料タンク１
８内の燃料の揺れによるタンク内圧力Ｐの上昇量が小さ
くなれば、その分、所定圧力ΔＰ０を小さい圧力に設定
することができて、測定区間を早期に開始することがで
き、異常診断に要する時間を短くすることができる。In particular, in the present embodiment (1), the tank pressure P detected by the pressure sensor 27 is smoothed, so that the tank pressure P caused by the fluctuation of the fuel in the fuel tank 18 is instantaneous. 1 mmHg
It can be suppressed to the extent. For this reason, even when the vehicle is running on a rough road or operating a sharp steering wheel, the amount of increase in the tank pressure P due to the sway of the fuel in the fuel tank 18 is reliably increased to the predetermined pressure ΔP0.
(For example, 2 mmHg) and the minimum pressure Pmi
The erroneous detection of n can be reliably prevented. Moreover, the fuel tank 1
If the amount of increase in the pressure P in the tank due to the fluctuation of the fuel in the fuel tank 8 becomes small, the predetermined pressure ΔP0 can be set to a small pressure, and the measurement section can be started early, and the abnormality diagnosis can be performed. The required time can be shortened.
【００３３】尚、所定圧力ΔＰ０は２ｍｍＨｇに限定さ
れず、それよりも小さくても、大きくても良く、要は、
悪路走行や急ハンドル操作等により燃料タンク１８内の
燃料の揺れが大きくなったときに発生するタンク内圧力
Ｐの上昇量よりも大きい値に設定すれば良い。The predetermined pressure ΔP0 is not limited to 2 mmHg, but may be smaller or larger than that.
It may be set to a value larger than the amount of increase in the tank pressure P that occurs when the fuel in the fuel tank 18 shakes greatly due to rough road running, sudden steering operation, or the like.
【００３４】［実施形態（２）］上記実施形態（１）で
は、負圧導入終了時から測定区間開始時までの第１の圧
力変化量ΔＰ１と、負圧導入終了時から測定区間終了時
までの第２の圧力変化量ΔＰ２とを測定し、後者から前
者を差し引くことで測定区間内の圧力変化量ΔＰを算出
するようにしたが、図６及び図７に示す本発明の実施形
態（２）では、測定区間開始時の圧力Ｐ１と測定区間終
了時の圧力Ｐ２とをそれぞれ検出し、測定区間終了時の
圧力Ｐ２から測定区間開始時の圧力Ｐ１を差し引くこと
で、測定区間内の圧力変化量ΔＰを算出するようにして
いる。[Embodiment (2)] In the embodiment (1), the first pressure change amount ΔP1 from the end of the introduction of the negative pressure to the start of the measurement section, and from the end of the introduction of the negative pressure to the end of the measurement section. Is measured by subtracting the former from the latter, and calculating the pressure change ΔP in the measurement section. However, the second embodiment of the present invention (2) shown in FIGS. In), the pressure P1 at the start of the measurement section and the pressure P2 at the end of the measurement section are detected, respectively, and the pressure P1 at the start of the measurement section is subtracted from the pressure P2 at the end of the measurement section to obtain a pressure change in the measurement section. The amount ΔP is calculated.
【００３５】図６及び図７に示す異常診断プログラムで
は、負圧導入終了後に、タンク内圧力Ｐが１ｓｅｃ前の
タンク内圧力Ｐold よりも所定圧力ΔＰ０以上上昇した
時点で、測定区間開始と判断して、ステップ２０９から
ステップ２１０ａに進み、その時点のタンク内圧力Ｐを
測定区間開始時の圧力Ｐ１として記憶する。In the abnormality diagnosis program shown in FIGS. 6 and 7, after the introduction of the negative pressure, the measurement section is determined to be started when the tank pressure P exceeds the tank pressure Pold one second earlier by a predetermined pressure ΔP0 or more. Then, the process proceeds from step 209 to step 210a, in which the tank pressure P at that time is stored as the pressure P1 at the start of the measurement section.
【００３６】そして、測定区間開始から所定時間経過し
た時点で、測定区間終了と判断してステップ２１３から
ステップ２１５ａに進み、その時点のタンク内圧力Ｐ
（つまり測定区間終了時の圧力Ｐ２）から測定区間開始
時の圧力Ｐ１を差し引くことで、測定区間内の圧力変化
量ΔＰを算出し、次のステップ２１６で、測定区間内の
圧力変化量ΔＰを判定値と比較してエバポガスパージ系
の異常診断を行う。その他のステップの処理は、前記実
施形態（１）で説明した図３及び図４の各ステップと同
じであるので説明を省略する。以上説明した実施形態
（２）においても、前記実施形態（１）と同じ作用効果
を得ることができる。When a predetermined time has elapsed from the start of the measurement section, it is determined that the measurement section has ended, and the process proceeds from step 213 to step 215a.
By subtracting the pressure P1 at the start of the measurement section from the pressure P2 at the start of the measurement section (that is, the pressure P2 at the end of the measurement section), the pressure change amount ΔP in the measurement section is calculated. In the next step 216, the pressure change amount ΔP in the measurement section is calculated. An abnormality diagnosis of the evaporative gas purge system is performed in comparison with the determination value. The processing of the other steps is the same as that of each step of FIGS. 3 and 4 described in the embodiment (1), and thus the description is omitted. In the embodiment (2) described above, the same operation and effect as in the embodiment (1) can be obtained.
【００３７】尚、図１の構成では、エバポガスパージ系
の圧力を検出する手段として、燃料タンク２８の内圧を
検出する圧力センサ２７を設けたが、例えばエバポ通路
２１に圧力センサを設けても良く、要は、燃料タンク１
８からパージ制御弁２６までのいずれかの箇所の圧力を
検出するようにすれば良い。また、負圧導入終了時の負
圧は−１５ｍｍＨｇに限定されず、例えば−１０ｍｍＨ
ｇ、−２０ｍｍＨｇ等であっても良い。また、測定区間
も１５ｓｅｃに限定されず、これよりも短くても、長く
ても良い。In the configuration shown in FIG. 1, the pressure sensor 27 for detecting the internal pressure of the fuel tank 28 is provided as means for detecting the pressure of the evaporative gas purge system, but a pressure sensor may be provided in the evaporative passage 21 for example. In short, the fuel tank 1
The pressure at any point from 8 to the purge control valve 26 may be detected. Further, the negative pressure at the end of the introduction of the negative pressure is not limited to −15 mmHg.
g, -20 mmHg or the like. Also, the measurement section is not limited to 15 seconds, but may be shorter or longer.
【図１】実施形態（１）におけるシステム全体の概略構
成図FIG. 1 is a schematic configuration diagram of an entire system according to an embodiment (1).
【図２】タンク内圧力検出プログラムの処理の流れを示
すフローチャートFIG. 2 is a flowchart showing a processing flow of a tank pressure detection program.
【図３】実施形態（１）の異常診断プログラムの前半部
の処理の流れを示すフローチャートFIG. 3 is a flowchart showing the flow of processing in the first half of the abnormality diagnosis program according to the embodiment (1);
【図４】実施形態（１）の異常診断プログラムの後半部
の処理の流れを示すフローチャートFIG. 4 is a flowchart showing the flow of processing in the second half of the abnormality diagnosis program according to the embodiment (1).
【図５】異常診断実行時の大気開閉弁及びパージ制御弁
の開閉動作とエバポガスパージ系の圧力変化の一例を示
すタイムチャートFIG. 5 is a time chart showing an example of the opening / closing operation of the atmosphere opening / closing valve and the purge control valve and the change in pressure of the evaporative gas purge system when the abnormality diagnosis is performed.
【図６】実施形態（２）の異常診断プログラムの前半部
の処理の流れを示すフローチャートFIG. 6 is a flowchart showing the flow of processing in the first half of the abnormality diagnosis program according to the embodiment (2).
【図７】実施形態（２）の異常診断プログラムの後半部
の処理の流れを示すフローチャートFIG. 7 is a flowchart showing the flow of processing in the second half of the abnormality diagnosis program according to the embodiment (2).
１１…エンジン（内燃機関）、１２…吸気管、１５…サ
ージタンク、１８…燃料タンク、２０…エバポガスパー
ジシステム、２１…エバポ通路、２２…キャニスタ、２
３…大気連通管、２４…大気開閉弁、２５…パージ通
路、２６…パージ制御弁、２７…圧力センサ、２８…エ
ンジン制御回路（負圧導入制御手段，異常診断手段）、
２９…警告ランプ。DESCRIPTION OF SYMBOLS 11 ... Engine (internal combustion engine), 12 ... Intake pipe, 15 ... Surge tank, 18 ... Fuel tank, 20 ... Evaporation gas purge system, 21 ... Evaporation passage, 22 ... Canister, 2
3 ... atmosphere communication pipe, 24 ... atmosphere opening / closing valve, 25 ... purge passage, 26 ... purge control valve, 27 ... pressure sensor, 28 ... engine control circuit (negative pressure introduction control means, abnormality diagnosis means),
29 ... Warning lamp.
Claims (2)
する通路に、前記燃料タンク内の燃料が蒸発して生じた
エバポガスを吸着するキャニスタと、このキャニスタか
ら前記吸気管へのエバポガスのパージを制御するパージ
制御弁とを設けたエバポガスパージシステムにおいて、 前記パージ制御弁を開弁して前記燃料タンクを含むエバ
ポガスパージ系に前記吸気管から負圧を導入し、該パー
ジ制御弁を閉弁して該エバポガスパージ系を密閉する負
圧導入制御手段と、 負圧導入後の前記エバポガスパージ系の密閉期間中に該
エバポガスパージ系内の圧力を検出し、該圧力が最低圧
力になってから所定圧力だけ上昇した時点から所定期間
内の圧力変化量を測定して、その測定値に基づいて該エ
バポガスパージ系の異常診断を行う異常診断手段とを備
えていることを特徴とするエバポガスパージシステムの
異常診断装置。1. A canister for adsorbing evaporative gas generated by evaporating fuel in the fuel tank into a passage communicating the fuel tank with an intake pipe of an internal combustion engine, and purging the evaporative gas from the canister to the intake pipe. An evaporative gas purge system provided with a purge control valve for controlling a pressure of the fuel cell, wherein the purge control valve is opened to introduce a negative pressure from the intake pipe into an evaporative gas purge system including the fuel tank, and the purge control valve is closed. Negative pressure introduction control means for closing the evaporative gas purge system, and detecting the pressure in the evaporative gas purge system during the period of closing the evaporative gas purge system after the introduction of the negative pressure, and after the pressure becomes the minimum pressure, Abnormality diagnosing means for measuring an amount of pressure change within a predetermined period from a point in time when the pressure has increased by a predetermined pressure, and performing an abnormality diagnosis of the evaporative gas purge system based on the measured value. Abnormality diagnosis apparatus for fuel vapor purge system, wherein are e.
ら前記所定期間開始時までの圧力変化量と、負圧導入終
了時から前記所定期間終了時までの圧力変化量とを測定
し、後者から前者を差し引くことで前記所定期間内の圧
力変化量を算出することを特徴とする請求項１に記載の
エバポガスパージシステムの異常診断装置。2. The abnormality diagnosis means measures a pressure change amount from the end of negative pressure introduction to the start of the predetermined period, and a pressure change amount from end of negative pressure introduction to the end of the predetermined period, The abnormality diagnosis device for an evaporative gas purge system according to claim 1, wherein the pressure change amount within the predetermined period is calculated by subtracting the former from the latter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28281898A JP3449249B2 (en) | 1998-10-05 | 1998-10-05 | Abnormality diagnosis device for evaporative gas purge system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28281898A JP3449249B2 (en) | 1998-10-05 | 1998-10-05 | Abnormality diagnosis device for evaporative gas purge system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000110674A true JP2000110674A (en) | 2000-04-18 |
| JP3449249B2 JP3449249B2 (en) | 2003-09-22 |
Family
ID=17657493
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28281898A Expired - Lifetime JP3449249B2 (en) | 1998-10-05 | 1998-10-05 | Abnormality diagnosis device for evaporative gas purge system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3449249B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6701777B2 (en) | 2001-03-14 | 2004-03-09 | Honda Giken Kogyo Kabushiki Kaisha | Leak determining apparatus, leak determining method, and engine control unit for an evaporated fuel treatment system |
| KR100471204B1 (en) * | 2001-10-08 | 2005-03-07 | 현대자동차주식회사 | Evaporative gas leakage monitoring method |
| US10934963B2 (en) | 2019-02-08 | 2021-03-02 | Honda Motor Co., Ltd. | Abnormality assessment device of internal combustion engine |
-
1998
- 1998-10-05 JP JP28281898A patent/JP3449249B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6701777B2 (en) | 2001-03-14 | 2004-03-09 | Honda Giken Kogyo Kabushiki Kaisha | Leak determining apparatus, leak determining method, and engine control unit for an evaporated fuel treatment system |
| KR100471204B1 (en) * | 2001-10-08 | 2005-03-07 | 현대자동차주식회사 | Evaporative gas leakage monitoring method |
| US10934963B2 (en) | 2019-02-08 | 2021-03-02 | Honda Motor Co., Ltd. | Abnormality assessment device of internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3449249B2 (en) | 2003-09-22 |
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