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EP1068434A1 - Diagnosis of air containment for air-contained injection valves - Google Patents

Diagnosis of air containment for air-contained injection valves

Info

Publication number
EP1068434A1
EP1068434A1 EP99967897A EP99967897A EP1068434A1 EP 1068434 A1 EP1068434 A1 EP 1068434A1 EP 99967897 A EP99967897 A EP 99967897A EP 99967897 A EP99967897 A EP 99967897A EP 1068434 A1 EP1068434 A1 EP 1068434A1
Authority
EP
European Patent Office
Prior art keywords
air
injection valves
diagnosis
intake manifold
engine
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
EP99967897A
Other languages
German (de)
French (fr)
Other versions
EP1068434B1 (en
Inventor
Joerg Lange
Dieter-Andreas Dambach
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1068434A1 publication Critical patent/EP1068434A1/en
Application granted granted Critical
Publication of EP1068434B1 publication Critical patent/EP1068434B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/08—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by the fuel being carried by compressed air into main stream of combustion-air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D7/00—Other fuel-injection control
    • F02D7/02—Controlling fuel injection where fuel is injected by compressed air

Definitions

  • a diagnosis of the air enclosure is known for example from WO 96/04473 and from PCT / EP 95/02989. It is then known to switch off the air supply at idle warm engine, an observation of the amount of air flowing through the idle actuator and a balance of the amount of air before and after switching off. It is also known to switch off the air supply and to observe the measured lambda curve.
  • the object of the invention is to provide a diagnosis of the air enclosure with a simple and robust function that does not require any additional components.
  • Fig. 1 shows the technical environment of the invention.
  • Fig. 2 discloses a flow chart as an embodiment of the invention.
  • FIG. 1 in FIG. 1 represents an internal combustion engine with intake manifold 2, ice spray valve 3 with air enclosure 4 and air enclosure shutdown means 5, a throttle valve 6 with throttle valve position sensor 7, an intake manifold pressure sensor 8 and a control unit 9.
  • An intake manifold pressure sensor 8 is often installed in on-board diagnostic engine control systems, in particular in the case of pressure-controlled load detection, but also in systems with exhaust gas recirculation in order to diagnose the exhaust gas recirculation. This print-based
  • Exhaust gas recirculation diagnosis is generally carried out in a coasting phase of the engine, which is characterized in that the engine is pushed with the throttle valve closed, which can be detected by the sensor 7, and speeds above the idling speed and therefore builds up a strong negative pressure in the intake manifold. If the exhaust gas recirculation valve is then opened, exhaust gas flows from the exhaust system into the intake manifold, causing it to exhaust existing negative pressure is reduced somewhat. This pressure increase is measured by the pressure sensor and evaluated in the engine control.
  • the present invention is based on the same principle: in push mode (step 2 in FIG.
  • step 2 the air enclosure of the injection valves is switched off or on (step 3) and the change in the intake manifold pressure resulting from the change in the air supply is measured (steps 1, 4 and 5). If the intake manifold pressure changes sufficiently, it can be concluded that the air enclosure is functioning properly (steps 6 and 7).
  • the level of the pressure difference also allows conclusions to be drawn about the amount of air flowing through the air enclosure, and can therefore serve not only as a qualitative but also as a quantitative diagnosis.
  • the invention thus includes a method for on-board diagnosis of the air enclosure of injection valves for gasoline engines. Your advantages are: Pressure sensors are used, which are already available in many systems, i.e. no additional components are required.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

The invention relates to a method for diagnosing the air containment of air-contained injection valves of an Otto engine with an induction pipe pressure sensor. According to said method, the air containment of the air-contained injection valves is switched off or on when the engine is hot, in overrun and the change in the induction pipe pressure resulting from the change in the air supply to the induction pipe is determined and compared with a threshold value. A value which does not exceed the threshold value is considered a defect.

Description

Diagnose der Luftumfassung bei luftumfaiSten EinspritzventilenAir containment diagnosis for the most air-filled injectors
Stand der TechnikState of the art
Amerikanische Behörden schreiben eine On-Board-Diagnose für PKW vor. Auch in Europa gibt es bereits Gesetzesentwürfe für eine On-Board-Diagnose, die künftig vorgeschrieben werden soll. Diagnostiziert werden müssen alle emissionsrelevante Komponenten und Systeme von Motorsteuerungen. Daher sind auch luftumfaßte Einspritzventile bei Ottomotoren zu überwachen. Dies geschieht bereits heute zum einen durch eine Endstufendiagnose der Einspritzventile, zum anderen durch die Beobachtung des Lambdareglers, der jede Abweichung der eingespritzten Kraftstoffmenge vom Sollwert durch eine Abweichung des Lambdawertes vom Sollwert registriert und auszuregeln versucht. Falls allerdings die Luftunterstützung der Einspritzventile fehlerhaft arbeitet und dadurch die Kraftstoffaufbereitung nicht mehr optimal ist, kann dies von herkömmlichen Diagnosefunktionen nicht registriert werden. Folge ist unter Umständen ein starker Anstieg der schädlichen Emissionen, insbesondere bei kaltem Motor.American authorities require on-board diagnostics for cars. In Europe, too, there are already draft laws for on-board diagnosis that will be mandatory in the future. All emission-relevant components and systems of engine controls must be diagnosed. For this reason, air-enclosed injection valves in gasoline engines must also be monitored. This is already done today on the one hand by means of final stage diagnosis of the injection valves, and on the other hand by observing the lambda controller, which registers and attempts to correct any deviation of the injected fuel quantity from the setpoint by a deviation of the lambda value from the setpoint. However, if the air support of the injection valves is working incorrectly and the fuel preparation is no longer optimal, this cannot be registered by conventional diagnostic functions. This can result in a sharp increase in harmful emissions, especially when the engine is cold.
Eine Diagnose der Luftumfassung ist beispielsweise aus der WO 96/04473 sowie aus der PCT/EP 95/02989 bekannt. Bekannt ist danach ein Abschalten der Luftzufuhr im Leerlauf bei warmem Motor, dabei eine Beobachtung der Luftmenge, die durch den Leerlaufsteller strömt und eine Bilanzierung der Luftmenge vor und nach dem Abstellen. Weiter bekannt ist ein Abschalten der Luftzufuhr und eine Beobachtung des gemessenen Lambdaverlaufs .A diagnosis of the air enclosure is known for example from WO 96/04473 and from PCT / EP 95/02989. It is then known to switch off the air supply at idle warm engine, an observation of the amount of air flowing through the idle actuator and a balance of the amount of air before and after switching off. It is also known to switch off the air supply and to observe the measured lambda curve.
Die Aufgabe der Erfindung besteht in der Angabe einer Diagnose der Luftumfassung mit einfacher und robuster Funktion, die keine zusätzlichen Komponenten erfordert.The object of the invention is to provide a diagnosis of the air enclosure with a simple and robust function that does not require any additional components.
Diese Aufgabe wird mit den Merkmalen des Anspruchs 1 gelöst . Im folgenden wird ein Ausführungsbeispiel der Erfindung mit Bezug auf die Figuren erläutert. Fig. 1 zeigt das technische Umfeld der Erfindung. Fig. 2 offenbart ein Flußdiagramm als Ausführeungsbeispiel der Erfindung.This object is achieved with the features of claim 1. In the following an embodiment of the invention is explained with reference to the figures. Fig. 1 shows the technical environment of the invention. Fig. 2 discloses a flow chart as an embodiment of the invention.
Die 1 in der Fig. 1 repräsentiert einen Verbrennungsmotor mit Saugrohr 2, Eispritzventil 3 mit Luftumfassung 4 und Luftumfassungsabschaltmitteln 5, einer Drosselklappe 6 mit Drosselklappenpositionssensor 7, einem Saugrohrdrucksensor 8 und einem Steuergerät 9.1 in FIG. 1 represents an internal combustion engine with intake manifold 2, ice spray valve 3 with air enclosure 4 and air enclosure shutdown means 5, a throttle valve 6 with throttle valve position sensor 7, an intake manifold pressure sensor 8 and a control unit 9.
In On-Board-Diagnose-Motorsteuerungssystemen ist häufig ein Saugrohrdrucksensor 8 eingebaut, insbesondere bei druckgeführter Lasterfassung, aber auch bei Systemen mit Abgasrückführung, um die Abgasrückführung zu diagnostizieren. Diese druckbasierteAn intake manifold pressure sensor 8 is often installed in on-board diagnostic engine control systems, in particular in the case of pressure-controlled load detection, but also in systems with exhaust gas recirculation in order to diagnose the exhaust gas recirculation. This print-based
Abgasrückführungsdiagnose erfolgt im allgemeinen in einer Schiebebetriebsphase des Motors, die dadurch gekennzeichnet ist, daß der Motor bei geschlossener Drosselklappe, die durch den Sensor 7 detektiert werden kann, und Drehzahlen oberhalb der Leerlaufdrehzahl geschoben wird und daher einen starken Unterdruck im Saugrohr aufbaut . Wird dann das Abgasrückführventil geöffnet, so strömt aus der Auspuffanläge Abgas in das Saugrohr ein, wodurch der dort vorhandene Unterdruck etwas abgebaut wird. Diese Druckerhöhung wird durch den Drucksensor gemessen und in der Motorsteuerung ausgewertet. Auf dem selben Prinzip basiert die vorliegende Erfindung: Im Schiebebetrieb (Schritt 2 in Fig. 2) wird die Luftumfassung der Einspritzventile ab- bzw. angeschaltet (Schritt 3) und die aus der Änderung der Luftzufuhr resultierende Änderung des Saugrohrdrucks gemessen (Schritte 1, 4 und 5) . Falls sich der Saugrohrdruck ausreichend stark ändert, kann auf eine einwandfreie Funktion der Luftumfassung geschlossen werden (Schritte 6 und 7) . Die Höhe des Druckunterschiedes läßt auch Rückschlüsse auf die durch die Luftumfassung strömende Luftmenge zu, kann also nicht nur als qualitative, sondern auch als quantitative Diagnose dienen.Exhaust gas recirculation diagnosis is generally carried out in a coasting phase of the engine, which is characterized in that the engine is pushed with the throttle valve closed, which can be detected by the sensor 7, and speeds above the idling speed and therefore builds up a strong negative pressure in the intake manifold. If the exhaust gas recirculation valve is then opened, exhaust gas flows from the exhaust system into the intake manifold, causing it to exhaust existing negative pressure is reduced somewhat. This pressure increase is measured by the pressure sensor and evaluated in the engine control. The present invention is based on the same principle: in push mode (step 2 in FIG. 2), the air enclosure of the injection valves is switched off or on (step 3) and the change in the intake manifold pressure resulting from the change in the air supply is measured (steps 1, 4 and 5). If the intake manifold pressure changes sufficiently, it can be concluded that the air enclosure is functioning properly (steps 6 and 7). The level of the pressure difference also allows conclusions to be drawn about the amount of air flowing through the air enclosure, and can therefore serve not only as a qualitative but also as a quantitative diagnosis.
Die Erfindung beinhaltet damit ein Verfahren zur On-Board- Diagnose der Luftumfassung von Einspritzventilen für Ottomotoren. Ihre Vorteile sind: Es wird auf Drucksensoren zurückgegriffen, welche in vielen Systemen bereits vorhanden sind, d.h. es sind keine zusätzlichen Komponenten nötig.The invention thus includes a method for on-board diagnosis of the air enclosure of injection valves for gasoline engines. Your advantages are: Pressure sensors are used, which are already available in many systems, i.e. no additional components are required.
Weiterhin ist die Funktion einfach und robust. Quantitative Aussagen über den Luftmassenstrom durch die Luftumfassung werden möglich. Furthermore, the function is simple and robust. Quantitative statements about the air mass flow through the air enclosure are possible.

Claims

Patentansprüche claims
1. Verfahren zur Diagnose der Luftumfassung bei luftumfaßten Einspritzventilen eines Ottomotors mit Saugrohrdrucksensor, Dadurch gekennzeichnet, daß die Luftumfassung der Einspritzventile bei warmem Motor im Schiebebetrieb ab- bzw. angeschaltet wird und die aus der Änderung der Luftzufuhr zum Saugrohr resultierende Änderung des Saugrohrdrucks erfaßt und mit einem Schwellenwert verglichen wird wobei ein NichtÜberschreiten des Schwellenwertes als Fehler gewertet wird.1. Method for diagnosing the air enclosure in air-enclosed injection valves of a gasoline engine with intake manifold pressure sensor, characterized in that the air enclosure of the injection valves is switched off or on when the engine is warm in push mode and the change in the intake manifold pressure resulting from the change in the air supply to the intake manifold is detected and with a threshold value is compared, a failure to exceed the threshold value being evaluated as an error.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß ergänzend aus der Höhe des Druckunterschiedes Rückschlüsse auf die durch die Luftumfassung strömende Luftmenge geschlossen wird. 2. The method according to claim 1, characterized in that additional conclusions are drawn from the amount of pressure difference on the amount of air flowing through the air enclosure.
EP99967897A 1998-12-30 1999-12-23 Diagnosis of air containment for air-contained injection valves Expired - Lifetime EP1068434B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19860535 1998-12-30
DE19860535A DE19860535A1 (en) 1998-12-30 1998-12-30 Air containment diagnosis for air-contained injectors
PCT/DE1999/004082 WO2000040846A1 (en) 1998-12-30 1999-12-23 Diagnosis of air containment for air-contained injection valves

Publications (2)

Publication Number Publication Date
EP1068434A1 true EP1068434A1 (en) 2001-01-17
EP1068434B1 EP1068434B1 (en) 2004-04-21

Family

ID=7892993

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99967897A Expired - Lifetime EP1068434B1 (en) 1998-12-30 1999-12-23 Diagnosis of air containment for air-contained injection valves

Country Status (4)

Country Link
EP (1) EP1068434B1 (en)
JP (1) JP2002534632A (en)
DE (2) DE19860535A1 (en)
WO (1) WO2000040846A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10223899A1 (en) * 2002-05-29 2003-12-18 Bayerische Motoren Werke Ag Method for checking an air supply system in an internal combustion engine

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06207544A (en) * 1991-09-24 1994-07-26 Nippondenso Co Ltd Fuel injecting device
JPH0599055A (en) * 1991-10-09 1993-04-20 Japan Electron Control Syst Co Ltd Controller for internal combustion engine with assist air supply device
JPH05263734A (en) * 1992-03-17 1993-10-12 Nissan Motor Co Ltd Diagnostic device for assist air device
JP2747397B2 (en) * 1992-08-12 1998-05-06 三菱電機株式会社 Fuel injection device for internal combustion engine
JPH06346825A (en) * 1993-06-08 1994-12-20 Nippondenso Co Ltd Abnormality detection device for assist air control device of internal combustion engine
FR2723149B1 (en) 1994-08-01 1996-09-13 Siemens Automotive Sa METHOD FOR MONITORING THE PROPER OPERATION OF THE AIR SUPPORT OF A FUEL INJECTOR FOR AN INTERNAL COMBUSTION ENGINE AND CORRESPONDING DEVICE

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0040846A1 *

Also Published As

Publication number Publication date
JP2002534632A (en) 2002-10-15
DE59909243D1 (en) 2004-05-27
WO2000040846A1 (en) 2000-07-13
DE19860535A1 (en) 2000-07-06
EP1068434B1 (en) 2004-04-21

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