DE4225361A1 - Functional testing of secondary air admission into IC engine exhaust - involves measuring lambda value of exhaust gases by sensor supplying electronic control unit for secondary air pump and valve - Google Patents
Functional testing of secondary air admission into IC engine exhaust - involves measuring lambda value of exhaust gases by sensor supplying electronic control unit for secondary air pump and valveInfo
- Publication number
- DE4225361A1 DE4225361A1 DE4225361A DE4225361A DE4225361A1 DE 4225361 A1 DE4225361 A1 DE 4225361A1 DE 4225361 A DE4225361 A DE 4225361A DE 4225361 A DE4225361 A DE 4225361A DE 4225361 A1 DE4225361 A1 DE 4225361A1
- Authority
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- Germany
- Prior art keywords
- secondary air
- combustion engine
- internal combustion
- air supply
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 239000007789 gas Substances 0.000 title claims abstract description 20
- 238000012360 testing method Methods 0.000 title claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000011144 upstream manufacturing Methods 0.000 claims abstract 2
- 238000002485 combustion reaction Methods 0.000 claims description 22
- 239000000523 sample Substances 0.000 claims description 15
- 238000001784 detoxification Methods 0.000 claims description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 2
- 239000003546 flue gas Substances 0.000 claims description 2
- 238000011990 functional testing Methods 0.000 claims 3
- 239000002816 fuel additive Substances 0.000 claims 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 6
- 239000001301 oxygen Substances 0.000 abstract description 6
- 229910052760 oxygen Inorganic materials 0.000 abstract description 6
- 238000005202 decontamination Methods 0.000 abstract 1
- 230000003588 decontaminative effect Effects 0.000 abstract 1
- 238000012544 monitoring process Methods 0.000 abstract 1
- 239000003054 catalyst Substances 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 241001026509 Kata Species 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000012549 training Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/22—Control of additional air supply only, e.g. using by-passes or variable air pump drives
- F01N3/222—Control of additional air supply only, e.g. using by-passes or variable air pump drives using electric valves only
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/007—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring oxygen or air concentration downstream of the exhaust apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/22—Control of additional air supply only, e.g. using by-passes or variable air pump drives
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating, or supervising devices
- F02B77/085—Safety, indicating, or supervising devices with sensors measuring combustion processes, e.g. knocking, pressure, ionization, combustion flame
- F02B77/086—Sensor arrangements in the exhaust, e.g. for temperature, misfire, air/fuel ratio, oxygen sensors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
- F02D35/0015—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for using exhaust gas sensors
- F02D35/0023—Controlling air supply
- F02D35/0038—Controlling air supply by means of air pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D41/221—Safety or indicating devices for abnormal conditions relating to the failure of actuators or electrically driven elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
- F01N2550/14—Systems for adding secondary air into exhaust
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/04—Methods of control or diagnosing
- F01N2900/0422—Methods of control or diagnosing measuring the elapsed time
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Funktionsprü fung der Sekundärluftzuführung in das Abgassystem einer Brennkraftmaschine mit Abgasentgiftung, gemäß dem Ober begriff des Patentanspruches 1.The invention relates to a method for functional testing the secondary air supply into the exhaust system Internal combustion engine with exhaust gas detoxification, according to the Ober Concept of claim 1.
Um eine sofort einsetzende verbesserte Abgasentgiftung im Kaltstartbereich der Brennkraftmaschine zu erzielen und bei Verwendung beispielsweise eines Dreiwege-Kata lysators dessen schnelles Anspringen sicherzustellen, ist es bekannt, in das Abgassystem Sekundärluft einzu führen und die Brennkraftmaschine kurzfristig mit über stöchiometrischem Brennstoff-Luft-Verhältnis (= fett) zu betreiben. Dabei ist es durch den japanischen Patentab stract 3-15619 (A) bekannt, die Sekundärluftzuführung zu überprüfen, indem der Temperaturanstieg des Katalysators gemessen und mit einem Sollwert verglichen wird. Ein derartiges Verfahren ist aber aufwendig und erfordert zusätzliche Mittel, wie genaue Temperatursensoren etc.For immediate, improved exhaust gas detoxification to achieve in the cold start area of the internal combustion engine and when using, for example, a three-way kata lysators to ensure its quick start, it is known to introduce secondary air into the exhaust system lead and the internal combustion engine at short notice with stoichiometric fuel-air ratio (= rich) too operate. It is through the Japanese patent stract 3-15619 (A) known to close the secondary air supply check by the temperature rise of the catalyst measured and compared with a target value. A such a method is complex and required additional means such as accurate temperature sensors etc.
Aufgabe der Erfindung ist es, ein gattungsgemäßes Ver fahren aufzuzeigen, welches mit einfachen Mitteln eine genauere Überprüfung der Sekundärluftzuführung ermög licht.The object of the invention is a generic Ver drive to show which one with simple means allows a more precise check of the secondary air supply light.
Diese Aufgabe wird erfindungsgemäß mit den kennzeichnen den Merkmalen des Patentanspruches 1 gelöst. Weitere vorteilhafte Weiterbildung des Verfahrens sind den wei teren Patentansprüchen entnehmbar. According to the invention, this object is characterized by the solved the features of claim 1. Further advantageous further development of the method are the white tere patent claims.
Bei dem erfindungsgemäßen Verfahren wird während der Se kundärluftzuführung das Ist-Signal oder ein Integrator signal der Abgassonde, insbesondere einer Lambdasonde, erfaßt und mit einem abgespeicherten Sollwert verglichen und bei einer vorgegebenen Differenz ein Fehlersignal erzeugt. Da die Lambdasonde aufgrund ihrer maschinenna hen Anordnung im Abgassystem und ggf. einer separaten Beheizung nach bereits wenigen Sekunden betriebsbereit ist, kann dieses Signal bzw. deren abgeleitetes Signal für die Zeit der Sekundärluftzuführung herangezogen werden, um ggf. eine Anomalie in der Sekundärluftzufüh rung aufzuzeigen. Dabei kann in einem Speicher eines elektronischen Steuergerätes, z. B. unmittelbar in dem Steuergerät für die Lambdaregelung, ein Sollwert oder ein Kennfeld mit mehreren Sollwerten abgelegt und ein Ist-Sollwertvergleich durchgeführt werden.In the method according to the invention, during the Se the actual signal or an integrator signal from the exhaust gas probe, in particular a lambda probe, recorded and compared with a stored setpoint and an error signal at a predetermined difference generated. Because the lambda sensor due to its machinenna hen arrangement in the exhaust system and possibly a separate one Heating ready for operation after just a few seconds this signal or its derived signal used for the time of the secondary air supply an anomaly in the secondary air supply point out. In this case, a electronic control unit, e.g. B. directly in the Control unit for the lambda control, a setpoint or a map with several setpoints stored and on Actual setpoint comparison.
In Weiterbildung des Verfahrens kann über die gesamte Prüfzeit der Signalpegel erfaßt und der Quotient aus dem Zeitintervall eines definierten Signalwertes gegenüber der Gesamtprüfzeit errechnet und mit abgespeicherten Werten verglichen werden.In further training of the method can be done over the entire Test time of the signal level recorded and the quotient from the Time interval of a defined signal value the total test time is calculated and saved Values are compared.
Ferner ist es vorteilhaft, insbesondere bei Brennkraft maschinen in Kraftfahrzeugen, definierte Lastzustände auszublenden (z. B. Schubphasen), in denen kein relevan tes Sondensignal ansteht. Ferner kann die Gesamtprüfzeit beginnen mit der Betriebsbereitschaft der Abgassonde, die nach wenigen Sekunden erreicht ist, und enden mit der Abschaltung der Sekundärluftzuführung.It is also advantageous, particularly in the case of internal combustion machines in motor vehicles, defined load conditions to hide (e.g. overrun phases) in which no relevant tes probe signal is present. Furthermore, the total test time begin with the operational readiness of the flue gas probe, which is reached after a few seconds and end with the shutdown of the secondary air supply.
In Weiterbildung des Verfahrens kann ferner auch bei betriebswarmer Brennkraftmaschine sporadisch und kurz zeitig die Sekundärluftzuführung eingeschaltet und eine Überprüfung des Abgassondensignals durchgeführt werden. In further development of the method can also be used for warm internal combustion engine sporadically and briefly the secondary air supply switched on and one Check the exhaust gas probe signal.
Damit kann beispielsweise die Dichtheit des Systems, insbesondere die Funktion des in der Sekundärluftzufüh rung angeordneten Steuerventiles überprüft werden. Durch die auf die plötzliche Änderung in der Abgaszusammenset zung bzw. Sauerstoffzuführung in das Abgassystem auftre tende Signalabweichung des Abgassondensignals kann auch die ordnungsgemäße Funktion der Sekundärluftzuführung zuverlässig geschlossen werden. Bevorzugt sollte diese Überprüfung bei einem stationären Betrieb der Brenn kraftmaschine erfolgen, insbesondere im Leerlaufbetrieb. Hier können Signalabweichungen an der Abgassonde beson ders genau erfaßt werden.For example, the tightness of the system, especially the function of the secondary air supply tion arranged control valve can be checked. By which is due to the sudden change in the exhaust gas composition or oxygen supply into the exhaust system Tending signal deviation of the exhaust gas probe signal can also the proper functioning of the secondary air supply be closed reliably. This should be preferred Check in a stationary operation of the Brenn engine take place, especially in idle mode. Signal deviations at the exhaust gas probe can be particularly important here which are precisely recorded.
Ein Ausführungsbeispiel der Erfindung ist im folgenden mit weiteren Einzelheiten näher erläutert. Die schemati sche Zeichnung zeigt inAn embodiment of the invention is as follows explained in more detail with further details. The schemati The drawing shows in
Fig. 1 ein Blockschaltbild einer Hubkolben-Brenn kraftmaschine mit Abgasentgiftung über einen Katalysator und mit einer Zuführein richtung für Sekundärluft, die über eine in das Abgassystem eingeschaltete Lambda sonde und ein Steuergerät überwacht ist; Fig. 1 is a block diagram of a reciprocating internal combustion engine with exhaust gas detoxification via a catalyst and with a feed device for secondary air, which is monitored by a switched-on lambda probe and a control unit;
Fig. 2 den Prüfablauf der Vorrichtung gemäß Fig. 1 anhand eines vereinfacht dargestellten Lambdasignales; und FIG. 2 shows the test sequence of the device according to FIG. 1 on the basis of a simplified Lambda signal; and
Fig. 3 einen weiteren Prüfablauf bei betriebswar mer Brennkraftmaschine zur Systemdicht heits-Überprüfung. Fig. 3 shows another test sequence in Betriebsswar mer internal combustion engine for system tightness check.
In der Fig. 1 ist mit 10 eine Vierzylinder-Hubkolben- Brennkraftmaschine bezeichnet, deren Brennstoff-Luft- Zuführung über einen Ansaugverteiler 12 und eine nicht dargestellte Brennstoffeinspritzung erfolgt, während das Abgas über einen Abgaskrümmer 14, ein Abgasvorrohr 16, einen Dreiwegekatalysator 18 und eine im übrigen nicht weiter dargestellte Abgasanlage mit einem Abgasrohr 20 abgeführt wird.In Fig. 1, 10 denotes a four-cylinder reciprocating internal combustion engine, the fuel-air supply via an intake manifold 12 and a fuel injection, not shown, while the exhaust gas through an exhaust manifold 14 , an exhaust pipe 16 , a three-way catalyst 18 and one exhaust system, not shown, is discharged with an exhaust pipe 20 .
Im Verbindungsbereich zwischen dem Abgaskrümmer 14 und dem Abgasvorrohr 16 ist eine Lambdasonde 22 als Abgas sonde bekannter Bauart vorgesehen, über die der Sauer stoffgehalt im Abgas der Brennkraftmaschine erfaßbar und damit die Brennstoffzumessung im Regelverfahren beein flußbar ist. Das Signal der Lambdasonde 22 wird dabei über eine Leitung 24 einem Steuergerät 26 für die Lamb daregelung zugeführt.In the connection area between the exhaust manifold 14 and the exhaust pipe 16 , a lambda probe 22 is provided as an exhaust gas probe of a known type, via which the oxygen content in the exhaust gas of the internal combustion engine can be detected and thus the fuel metering can be influenced in the control method. The signal from the lambda probe 22 is fed via a line 24 to a control unit 26 for the lambda control.
Über das elektronische Steuergerät 26 wird ferner die Sekundärluftzuführung zur Brennkraftmaschine 10 gesteu ert, wobei über eine Leitung 28 eine elektrisch ange triebene Sekundärluftpumpe 30 und über eine Leitung 32 ein Steuerventil 34 ansteuerbar ist. Das Steuerventil 34 sitzt in einer Zuführleitung 36, über die sauerstoffhal tiges Gas bzw. Luft in die Abgaskanäle der Brennkraftma schine 10 einblasbar ist.Via the electronic control unit 26 , the secondary air supply to the internal combustion engine 10 is also controlled, an electrically driven secondary air pump 30 being controlled via a line 28 and a control valve 34 being controllable via a line 32 . The control valve 34 is seated in a feed line 36 , via which oxygen-containing gas or air can be blown into the exhaust gas channels of the internal combustion engine 10 .
Wird die Brennkraftmaschine 10 im kalten Zustand gestar tet, was über ein Temperatursignal T1 dem Steuergerät 26 mitgeteilt wird, so wird die Sekundärluftpumpe 30 akti viert und das Steuerventil 34 geöffnet, so daß der mit überstöchiometrischem Brennstoff-Luft-Gemisch versorgten Brennkraftmaschine Luft bzw. Sauerstoff in das Abgassy stem eingeblasen wird. Nach einer kurzen Laufzeit von z. B. 20 Sekunden hat sich durch das heiße Abgas in Ver bindung mit der Nachreaktion durch die Sekundärluftein blasung die Abgassonde 22 auf eine Temperatur erwärmt, in der sie betriebsbereit ist.If the internal combustion engine 10 is started in the cold state, which is communicated to the control unit 26 via a temperature signal T1, the secondary air pump 30 is activated and the control valve 34 is opened, so that the internal combustion engine is supplied with air or oxygen with a stoichiometric fuel-air mixture is blown into the exhaust system. After a short term of z. B. 20 seconds, the exhaust gas probe 22 has warmed to a temperature at which it is ready for operation by the hot exhaust gas in connection with the after-reaction by the secondary air blowing.
Wie in Fig. 2 das Ablaufschema über der Zeit t (Linie I) zeigt, wird nach dem Motorstart an der Marke SLPein die Sekundärluftpumpe 30 und das Steuergerät 34 aktiviert, und zwar über die gesamte Sekundärluftzuführung von z. B. 90 Sekunden (bis SLPaus).As shown in Fig. 2, the flow chart of time t (curve I) shows, after engine start at the mark SLP, a secondary air pump 30 and the controller 34 is activated, specifically, for the entire secondary air feeding. B. 90 seconds (until SLP off ).
Mit der Betriebsbereitschaft der Lambdasonde 22 (z. B. nach 20 Sekunden) wird deren Signal fett (erhöht) oder mager erfaßt (Linien II und III) und für die Funktions überprüfung der Sekundärluftzuführung ausgewertet.With the operational readiness of the lambda probe 22 (e.g. after 20 seconds), its signal is detected as rich (increased) or lean (lines II and III) and evaluated for the function check of the secondary air supply.
Dabei werden definierte Lastzustände, wie z. B. Schub phasen (keine Brennstoffzuführung) oder hohe Motordreh zahlen (Überprüfung zu ungenau) gemäß Linie IV ausge blendet, also nicht bewertet.Defined load conditions, such as B. Thrust phase (no fuel supply) or high engine speed pay (verification too imprecise) according to line IV blinds, so not rated.
Die restlichen eine überstöchiometrische Brennstoff- Luft-Zumischung zur Brennkraftmaschine anzeigenden Signale (- fett; es könnten theoretisch aber auch die mager-Signale erfaßt werden) der Lambdasonde 22 werden in einem Zähler (Linie V) des elektronischen Steuerge rätes 26 addiert und der Quotient mit der Gesamtprüfzeit (abzüglich der ausgeblendeten Lastbereiche) ermittelt und mit einem im Steuergerät 26 in einem Festwertspei cher abgelegten Sollwert verglichen. Es versteht sich, daß anstelle eines Sollwertes auch mehrere Sollwerte ähnlich einem Kennfeld und zugeordnet verschiedenen Lastkollektiven der Brennkraftmaschine abgelegt sein können. The remaining signals indicating an over-stoichiometric fuel-air admixture to the internal combustion engine (- bold; theoretically, however, the lean signals could also be detected) of the lambda probe 22 are added in a counter (line V) of the electronic control unit 26 and the quotient is added the total test time (minus the hidden load ranges) determined and compared with a setpoint stored in the control unit 26 in a fixed value memory. It goes without saying that, instead of one setpoint, a plurality of setpoints can also be stored, similar to a map and assigned different load spectra of the internal combustion engine.
Weicht der über die Lambdasignale oder ein davon abge leitetes Integratorsignal ermittelte Istwert in defi nierter Weise von dem Sollwert ab, so wird über das Steuergerät 26 (vergleiche Fig. 1) ein Fehlersignal über eine Leitung 38 an eine Warnlampe 40 ausgegeben. Das Fehlersignal kann auch in einem Fehlerspeicher kurzzei tig oder dauerhaft abgelegt und bei einer Funktionsüber prüfung (on-board-Diagnose) ausgelesen werden.If the actual value determined via the lambda signals or an integrator signal derived therefrom differs from the target value in a defined manner, then an error signal is output via a line 38 to a warning lamp 40 via the control unit 26 (cf. FIG. 1). The error signal can also be stored temporarily or permanently in an error memory and read out during a function check (on-board diagnosis).
Die Fig. 3 zeigt ein weiteres Ablaufschema über der Zeit t (Linie VI) bei dem bei betriebswarmer Brennkraftma schine im Leerlauf (Leerlaufdrehzahl z. B. 800 Min-1) kurzzeitig die Sekundärluftpumpe 30 eingeschaltet (Linie VII), das Steuerventil 34 jedoch nicht aktiviert wird, also geschlossen ist. Die Linie VIII zeigt in ausgezoge nen Linien einen Verlauf des Integratorsignales 42, mit ansteigendem Mittelwert aufgrund des Lambdasignales "ma ger", der nach Abschalten der Sekundärluftpumpe 30 wieder abfällt auf den bei Leerlauf anstehenden normalen Mittelwert 44. Fig. 3 shows a further flow diagram over time t (line VI) in which the secondary air pump 30 is briefly switched on (line VII), but the control valve 34 is not, when the internal combustion engine is warm when idling (idling speed, for example 800 min-1) is activated, i.e. is closed. The line VIII shows in solid lines a course of the integrator signal 42 , with an increasing mean value due to the lambda signal "ma ger", which drops again after the secondary air pump 30 is switched off to the normal mean value 44 pending when idling.
Dieser Verlauf ergibt sich, wenn das Steuerventil 34 in der Sekundärluftzuführung undicht ist, also dem Abgas der Brennkraftmaschine zusätzlicher Sauerstoff zugeführt wird, der das Signal der Lambdasonde 22 nach "mager" (= Luftüberschuß in der Brennstoff-Luft-Zumischung) ver fälscht. Bei funktionsfähigem und dichtem Steuerventil 34 würde das Lambdasignal entsprechend dem Mittelwert 44 unverändert anstehen. Die gezeigte Abweichung kann über das Steuergerät 26 durch Vergleich mit einem abgespei cherten Sollwert erfaßt und ebenfalls ein Fehlersignal ausgelöst werden.This curve results when the control valve 34 is leaking in the secondary air supply, that is, additional oxygen is supplied to the exhaust gas of the internal combustion engine, which falsifies the signal from the lambda sensor 22 after "lean" (= excess air in the fuel-air admixture). With a functional and tight control valve 34 , the lambda signal would remain unchanged in accordance with the mean value 44 . The deviation shown can be detected by the control unit 26 by comparison with a stored setpoint and an error signal can also be triggered.
Claims (7)
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DE4225361A DE4225361A1 (en) | 1992-07-31 | 1992-07-31 | Functional testing of secondary air admission into IC engine exhaust - involves measuring lambda value of exhaust gases by sensor supplying electronic control unit for secondary air pump and valve |
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Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0659986A1 (en) * | 1993-12-21 | 1995-06-28 | Robert Bosch Gmbh | Method to monitor a secondary air system relating to the exhaust gas system of a motor vehicle |
DE4435196C1 (en) * | 1994-09-30 | 1995-10-12 | Siemens Ag | Burner system efficiency checking method for vehicle exhaust catalytic converter warm=up |
FR2726031A1 (en) * | 1994-10-21 | 1996-04-26 | Renault | Control process for post-combustion air pump for internal combustion engine |
FR2726860A1 (en) * | 1994-11-10 | 1996-05-15 | Renault | METHOD FOR CONTROLLING THE FUEL SUPPLY OF AN INTERNAL COMBUSTION ENGINE |
WO1998044246A1 (en) * | 1997-03-27 | 1998-10-08 | Siemens Aktiengesellschaft | Method for monitoring the secondary mass air flow of exhaust gas cleaning equipment |
DE19735318A1 (en) * | 1997-08-14 | 1999-02-18 | Bayerische Motoren Werke Ag | Method and device for checking the functionality of a secondary air pump in an internal combustion engine |
DE19734670C1 (en) * | 1997-08-11 | 1999-05-27 | Daimler Chrysler Ag | Exchanging test for lambda sensors |
DE19833148A1 (en) * | 1998-07-23 | 2000-01-27 | Daimler Chrysler Ag | Procedure for functional testing of adjusting element subject to pressure in IC engine which opens and closes bypass channel bridging across turbine of exhaust turbocharger |
EP0805914B1 (en) * | 1995-10-26 | 2000-02-09 | Siemens Aktiengesellschaft | Process for regulating the fuel-oxygen ratio of exhaust gas upstream of a catalytic converter |
DE102012209114A1 (en) * | 2012-05-30 | 2013-12-05 | Continental Automotive Gmbh | Method for operating internal combustion engine in motor cars, involves determining secondary air diagnosis value based on difference signal that is determined based on difference of pumping and Nernst voltage signals |
CN107740717A (en) * | 2017-09-20 | 2018-02-27 | 中国第汽车股份有限公司 | Secondary air valve on-line monitoring system |
DE102012113108B4 (en) | 2012-07-20 | 2023-09-21 | Hyundai Motor Company | VEHICLE HAVING A SYSTEM AND METHOD FOR DIAGNOSING SECONDARY AIR INFLATION DEVICE |
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DE2215533A1 (en) * | 1972-03-30 | 1973-10-11 | Bosch Gmbh Robert | METHOD AND DEVICE FOR EXHAUST GAS DETOXIFICATION FROM INTERNAL COMBUSTION MACHINERY |
DE3138060C2 (en) * | 1980-09-25 | 1987-05-27 | Toyota Jidosha Kogyo K.K., Toyota, Aichi, Jp | |
DE3710221C2 (en) * | 1986-03-27 | 1990-07-19 | Honda Giken Kogyo K.K., Tokio/Tokyo, Jp | |
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Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0659986A1 (en) * | 1993-12-21 | 1995-06-28 | Robert Bosch Gmbh | Method to monitor a secondary air system relating to the exhaust gas system of a motor vehicle |
US5542292A (en) * | 1993-12-21 | 1996-08-06 | Robert Bosch Gmbh | Method and device for monitoring a secondary-air system of a motor vehicle |
DE4435196C1 (en) * | 1994-09-30 | 1995-10-12 | Siemens Ag | Burner system efficiency checking method for vehicle exhaust catalytic converter warm=up |
FR2726031A1 (en) * | 1994-10-21 | 1996-04-26 | Renault | Control process for post-combustion air pump for internal combustion engine |
FR2726860A1 (en) * | 1994-11-10 | 1996-05-15 | Renault | METHOD FOR CONTROLLING THE FUEL SUPPLY OF AN INTERNAL COMBUSTION ENGINE |
EP0711912A1 (en) * | 1994-11-10 | 1996-05-15 | Regie Nationale Des Usines Renault S.A. | Method to control the fuel supply of internal combustion engines |
EP0805914B1 (en) * | 1995-10-26 | 2000-02-09 | Siemens Aktiengesellschaft | Process for regulating the fuel-oxygen ratio of exhaust gas upstream of a catalytic converter |
WO1998044246A1 (en) * | 1997-03-27 | 1998-10-08 | Siemens Aktiengesellschaft | Method for monitoring the secondary mass air flow of exhaust gas cleaning equipment |
DE19734670C1 (en) * | 1997-08-11 | 1999-05-27 | Daimler Chrysler Ag | Exchanging test for lambda sensors |
US6167754B1 (en) | 1997-08-11 | 2001-01-02 | Daimler-Chrysler Ag | Method of checking lambda sensor connections in multicylinder internal combustion engines |
DE19735318A1 (en) * | 1997-08-14 | 1999-02-18 | Bayerische Motoren Werke Ag | Method and device for checking the functionality of a secondary air pump in an internal combustion engine |
US6131447A (en) * | 1997-08-14 | 2000-10-17 | Bayerische Motoren Werke Aktiengesellschaft | Process and arrangement for checking the operability of a secondary air pump in an internal-combustion engine |
DE19833148A1 (en) * | 1998-07-23 | 2000-01-27 | Daimler Chrysler Ag | Procedure for functional testing of adjusting element subject to pressure in IC engine which opens and closes bypass channel bridging across turbine of exhaust turbocharger |
US6272860B1 (en) | 1998-07-23 | 2001-08-14 | Daimlerchrysler Ag | Method and apparatus for checking the functioning of a pressure-operated actuating element in an internal combustion engine |
DE19833148B4 (en) * | 1998-07-23 | 2005-09-08 | Daimlerchrysler Ag | Method and device for functional testing of a pressurized actuator in an internal combustion engine |
DE102012209114A1 (en) * | 2012-05-30 | 2013-12-05 | Continental Automotive Gmbh | Method for operating internal combustion engine in motor cars, involves determining secondary air diagnosis value based on difference signal that is determined based on difference of pumping and Nernst voltage signals |
DE102012113108B4 (en) | 2012-07-20 | 2023-09-21 | Hyundai Motor Company | VEHICLE HAVING A SYSTEM AND METHOD FOR DIAGNOSING SECONDARY AIR INFLATION DEVICE |
CN107740717A (en) * | 2017-09-20 | 2018-02-27 | 中国第汽车股份有限公司 | Secondary air valve on-line monitoring system |
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