EP1298304A2 - Procédé de régulation du rapport air-carburant pour moteur à combustion - Google Patents

Procédé de régulation du rapport air-carburant pour moteur à combustion Download PDF

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Publication number
EP1298304A2
EP1298304A2 EP02016473A EP02016473A EP1298304A2 EP 1298304 A2 EP1298304 A2 EP 1298304A2 EP 02016473 A EP02016473 A EP 02016473A EP 02016473 A EP02016473 A EP 02016473A EP 1298304 A2 EP1298304 A2 EP 1298304A2
Authority
EP
European Patent Office
Prior art keywords
catalyst
oxygen
exhaust gas
combustion engine
excess
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.)
Withdrawn
Application number
EP02016473A
Other languages
German (de)
English (en)
Other versions
EP1298304A3 (fr
Inventor
Eberhard Schnaibel
Andreas Blumenstock
Klaus Hirschmann
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 EP1298304A2 publication Critical patent/EP1298304A2/fr
Publication of EP1298304A3 publication Critical patent/EP1298304A3/fr
Withdrawn legal-status Critical Current

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    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1439—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the position of the sensor
    • F02D41/1441—Plural sensors
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D2041/147—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being a hydrogen content or concentration of the exhaust gases
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D2041/1472—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being a humidity or water content of the exhaust gases

Definitions

  • the invention relates to a method for controlling the Air / fuel ratio for an internal combustion engine with a catalyst and a so-called two-probe control with a first probe in front of the catalyst, which the Air / fuel ratio controls and with a second Exhaust gas probe behind the catalytic converter, which is the first exhaust gas probe sort of leads.
  • the object of the invention is to provide a Process to compensate for this effect.
  • Another measure provides that the second information is formed with the help of a hydrogen sensor.
  • the second piece of information becomes one Comparison of the results of different procedures for Assessment of the aging condition of the catalyst educated.
  • a preferred alternative provides that the method for Formation of the size for the state of aging on measurements of the Oxygen storage capacity of the catalyst below Use an oxygen-sensitive exhaust gas probe behind based on the catalyst.
  • Another measure provides that the procedures for Formation of the sizes for the state of aging differently sensitive to the appearance of hydrogen behind the React catalyst.
  • a further embodiment provides that the second Information signals the occurrence of hydrogen when the first method considers the catalyst to be old and the second method assessed the catalyst as new.
  • the invention is also directed to an electronic one Control device for performing the above Measures, step sequences and designs.
  • the invention is based on the knowledge that the cause the shift in the interaction between one age-dependent hydrogen production of the catalysts with a hydrogen cross sensitivity of oxygen-sensitive exhaust gas probes. Describes the concept of cross sensitivity a shift of Characteristic curve of the output signal of the exhaust gas probe over the Oxygen concentration when hydrogen occurs. At the The occurrence of hydrogen shifts the characteristic curve in Direction of increasing oxygen concentration. The Influence of hydrogen shifts the characteristic curve so that the probe in the presence of hydrogen indicates less oxygen than is actually available.
  • the controller coupled to the probe therefore closes lean fuel / air mixture. Therefore, it drops sharply Lambda-dependent nitrogen oxide conversion rate undesirably.
  • New catalysts have the property of hydrogen produce. This property leaves with increasing aging after, but is initially very pronounced.
  • Fig. 1 shows the technical environment in which the invention their effect unfolds.
  • Fig. 2 shows the course of the Concentration of various pollutants in the exhaust gas above the Air ratio lambda.
  • Figures 3 and 4 each show the Course of the signal of an oxygen-sensitive exhaust gas probe behind the catalyst at given Oxygen concentration upstream of the catalyst as it turns out when burning a mixture with the corresponding Sets lambda value in a preferred embodiment the invention.
  • FIG. 1 shows a control loop 1 with an internal combustion engine 2, a speed sensor 3, a fuel metering device 4 and a means 5 for detecting the amount of air sucked in ml, for example a hot film air mass meter, in one Intake pipe 6, an exhaust pipe 7 with one in front of one Catalytic converter 8 arranged exhaust gas probe 9, one behind the Catalytic converter arranged exhaust gas probe 12 and a control unit 10.
  • the number 11 denotes a hydrogen sensor which in an embodiment may be present. In one preferred embodiment can by a skillful Evaluation of the signal of the rear oxygen sensitive Exhaust gas probe 10 in certain operating states of the Internal combustion engine dispenses with the hydrogen sensor become.
  • Blocks 10.1 to 10.4 represent the function the injection time formation in the control unit 10
  • Block 10.1 a map memory
  • block 10.2 one multiplicative linkage
  • block 10.3 a primary Control algorithm
  • block 10.4 an additional acting Control algorithm
  • Block 10.5 represents one Setpoint / actual value comparison on which the supplementary Control algorithm based.
  • a preliminary Fuel metering signal rl, formed in block 10.1 as The function of air volume and speed is described in block 10.2 multiplicatively linked with a correction factor FR that the deviation of the mixture composition lambda from one Setpoint taken into account ..
  • the control factor is primarily derived from the Usonde_v signal front exhaust probe formed in the controller 10.3.
  • the signal of the the first exhaust gas probe already reacts due to its arrangement in the exhaust gas flow more quickly to changes in the Air / fuel ratio as the signal of the second Exhaust gas probe, since exhaust gases from the internal combustion engine up to the first Exhaust probe have to travel a shorter way than to to the second exhaust gas probe. This effect is due to the Oxygen storage capacity of the catalyst is increased. For a high response speed of the controller Mixture mismatches become the air / fuel ratio regulated primarily with the first exhaust gas probe.
  • Usonde_h of the second exhaust gas probe is general more precisely, since the one located in front of the second exhaust gas probe Catalyst the exhaust gas towards one Equilibrium setting of the exhaust gas components affected. It is also the signal of the second probe more resistant to aging, since the temperature load behind the Catalyst is smaller than at the installation location closer to the engine first exhaust gas probe.
  • the signal of the second exhaust gas probe is therefore used in addition to the correction of the scheme. For example, with the deviation of the signal second exhaust gas probe the setpoint for control with the first exhaust gas probe to be corrected.
  • the Corrective action is formed in block 10.4.
  • the probe arranged behind the catalytic converter compensates for age-related errors in the front probe as part of a superimposed control system. If, for example, the signal from the front probe indicates a mixture that is too rich due to aging, for example, lambda incorrectly equal to 0.95 with an actual lambda value of lambda equal to 1, the control reacts to this with an emaciation.
  • Fig. 2 shows the course of the concentration of various pollutants in the exhaust gas over the air ratio lambda.
  • the dashed curves represent the raw emissions of the internal combustion engine. They can be measured in front of the catalyst.
  • the solid lines represent the concentrations after the catalyst.
  • the undesirable strong increase in the NOx concentration in the range of lambda greater than one illustrates both the desired effect of the catalytic converter in the lambda control range and the undesirable possible effect of the hydrogen cross-sensitivity of the rear probe, which leads to a lambda shift to the right from the Control area can lead out.
  • One way of producing hydrogen on the farm of the internal combustion engine is to identify one Place hydrogen sensor behind the catalytic converter and evaluate its signal. A preferred alternative that no hydrogen sensor is required Looking at Figures 3 and 4 described.
  • the invention is based on the fact that different procedures to different degrees Lead production of hydrogen. With an aged Catalyst, in which only a comparatively small Production of hydrogen occurs, the different procedures to match results to lead. On the other hand, there are strong deviations between the Results, this indicates hydrogen production of the catalyst.
  • Figure 3 a shows the course of the air ratio lambda before Catalyst in connection with a coasting phase with Fuel cut.
  • the 1st phase still corresponds to that normal control operation: the air ratio lambda also oscillates low amplitude around the value one, more precisely around a value little less than one, around.
  • the 2nd phase corresponds to one Fuel cut-off in push mode. The The internal combustion engine is then flowed through with pure air.
  • the the associated lambda value is here for reasons of illustration finite size shown, but in principle infinitely large.
  • the catalyst is pushed to the limit Oxygen storage capacity filled with oxygen.
  • the 3rd phase takes place after the end of the push mode temporarily operating with a rich mixture because this is the Convertibility of the catalyst is positively influenced.
  • This enrichment corresponds to that used in FIG. 5 Concept of "cat clearing”. This term describes hence the intended breakdown of the stored in the catalyst Oxygen after a coasting phase with Excess oxygen. The enrichment can take place as long (Time period t) until the signal of the rear probe reaches the Enrichment reacts.
  • 3 b shows the corresponding signal USonde_h of the rear exhaust probe for a good catalyst once for the case with hydrogen production (line 1) and once for the case without hydrogen production (line 2).
  • the excess Fuel is compensated by the stored oxygen as long as until the oxygen storage of the catalyst is empty. at a new catalyst is the amount to be introduced fat mixture is much higher than that of an aged one Catalyst.
  • the time t shown in FIG. 3 is therefore proportional to the oxygen storage capacity, which in turn is a measure of the aging condition of the catalyst.
  • the relatively long time t shown corresponds to a good one Catalyst without hydrogen.
  • the introduction of a fat mixture increases the Hydrogen production.
  • the hydrogen produced shows hence an impact (fat shift) on the signal of the rear probe by the amount of hydrogen produced depends.
  • the fat shift here has the consequence that the Signal increases faster in the presence of hydrogen than in the absence of hydrogen.
  • the probe signal increases due to the strong catalyst Hydrogen production starts much faster than one old catalyst. This leads to a sharp shortening the time t during which the signal of the probe on the low level persists.
  • Figure 4 a shows the course of the air ratio Lambda before Catalyst in connection with a diagnosis (Aging condition determination) of the catalyst Acquisition and evaluation of the oxygen storage capacity of the Catalyst.
  • the 1st phase corresponds to the normal one again Control mode: The air ratio lambda oscillates with less Amplitude around the value one, more precisely around a value somewhat less than one, around.
  • the 2nd phase corresponds to one Enrichment of the fuel / air mixture to values lower as 1. Due to the resulting lack of oxygen in the The catalyst becomes exhaust gas if the duration of the second is sufficient Phase completely emptied of oxygen. In the 3rd phase occurs after the end of fuel enrichment Phase with excess air.
  • the Oxygen storage capacity at least one the integral of the Product of the sucked air volume ml and the deviation of the actual lambda value of the value 1 between a change in Oxygen content upstream of the catalyst and the associated one Reaction of the exhaust gas probe behind the catalytic converter evaluated values.
  • a first method can be a first Integral of the product of the aspirated air volume ml and Deviation of the actual lambda value from the value 1 for a Change in the oxygen content upstream of the catalyst Deliver change from excess oxygen to lack of oxygen and a second method can add a second integral a change in the oxygen content upstream of the catalyst when changing from lack of oxygen to excess oxygen deliver.
  • the second information signals an occurrence of Hydrogen when the first integral is an aged one
  • the catalyst signals and the second integral a new one Catalytic converter signals.
  • Fig. 5 shows a self-explanatory flow chart as Embodiment of the method according to the invention.
  • Step 5.1 corresponds to that with regard to FIG. 3 described method.
  • Step corresponds accordingly 5.2 to Fig. 4.
  • An example of the measure after step 5.3 is above with the correction of the setpoint for the front exhaust probe described.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
EP02016473A 2001-09-26 2002-07-23 Procédé de régulation du rapport air-carburant pour moteur à combustion Withdrawn EP1298304A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10147491 2001-09-26
DE2001147491 DE10147491A1 (de) 2001-09-26 2001-09-26 Verfahren zur Regelung des Kraftstoff/Luftverhältnisses für einen Verbrennungsmotor

Publications (2)

Publication Number Publication Date
EP1298304A2 true EP1298304A2 (fr) 2003-04-02
EP1298304A3 EP1298304A3 (fr) 2006-01-18

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EP02016473A Withdrawn EP1298304A3 (fr) 2001-09-26 2002-07-23 Procédé de régulation du rapport air-carburant pour moteur à combustion

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JP (1) JP4223772B2 (fr)
DE (1) DE10147491A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006123564A1 (fr) * 2005-05-19 2006-11-23 Toyota Jidosha Kabushiki Kaisha Dispositif de purification des gaz d'echappement pour moteur a combustion interne
WO2007066209A1 (fr) * 2005-12-08 2007-06-14 Toyota Jidosha Kabushiki Kaisha Appareil et procede pour commander le rapport air-carburant dans un moteur a combustion interne
WO2007099429A1 (fr) * 2006-02-28 2007-09-07 Toyota Jidosha Kabushiki Kaisha Système de purification des gaz d'échappement pour un moteur à combustion interne et procédé de commande du système de purification des gaz d'échappement
US7502683B2 (en) * 2005-01-31 2009-03-10 Siemens Vdo Automotive Ag Device and method for determining an adjustable variable of an internal combustion engine regulator
US7597091B2 (en) 2005-12-08 2009-10-06 Toyota Jidosha Kabushiki Kaisha Air-fuel ratio control apparatus and method for an internal combustion engine

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2418264B (en) * 2004-09-16 2009-03-04 Ford Global Tech Llc A method for recognising and using changes in the exhaust gasses emitted from an engine
DE102004050628B4 (de) * 2004-10-18 2008-05-15 Audi Ag Verfahren zur Überprüfung der Sauerstoffspeicherkapazität eines Oxidationskatalysators
JP4192905B2 (ja) 2005-03-04 2008-12-10 トヨタ自動車株式会社 内燃機関の排気浄化装置
JP4935547B2 (ja) 2007-07-09 2012-05-23 トヨタ自動車株式会社 内燃機関の異常判定装置
JP2007198251A (ja) * 2006-01-26 2007-08-09 Toyota Motor Corp 触媒劣化検出装置
DE102006011894B4 (de) * 2006-03-15 2021-01-21 Robert Bosch Gmbh Verfahren zur Korrektur eines von einem Lambdasensor bereitgestellten Signals
JP5761127B2 (ja) * 2012-06-06 2015-08-12 トヨタ自動車株式会社 触媒劣化診断装置
DE102012221549A1 (de) 2012-11-26 2014-05-28 Robert Bosch Gmbh Verfahren und Vorrichtung zur Bestimmung einer Zusammensetzung eines Gasgemischs
US9863922B2 (en) 2014-10-29 2018-01-09 GM Global Technology Operations LLC NOx sensor calibration and application in lean NOx trap aftertreat systems
JP6102908B2 (ja) * 2014-12-26 2017-03-29 トヨタ自動車株式会社 排気浄化装置の劣化診断装置
DE102018208729B4 (de) * 2018-06-04 2021-11-18 Audi Ag Verfahren zum Betreiben einer Antriebseinrichtung sowie entsprechende Antriebseinrichtung

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5307625A (en) 1991-07-30 1994-05-03 Robert Bosch Gmbh Method and arrangement for monitoring a lambda probe in an internal combustion engine

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DE4128997A1 (de) * 1991-08-31 1993-03-04 Abb Patent Gmbh Verfahren und vorrichtung zur regelung und pruefung
US5472580A (en) * 1994-06-09 1995-12-05 General Motors Corporation Catalytic converter diagnostic sensor
US6513321B2 (en) * 1999-12-28 2003-02-04 Honda Giken Kogyo Kabushiki Kaisha Exhaust gas purifying apparatus for internal combustion engine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5307625A (en) 1991-07-30 1994-05-03 Robert Bosch Gmbh Method and arrangement for monitoring a lambda probe in an internal combustion engine

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7502683B2 (en) * 2005-01-31 2009-03-10 Siemens Vdo Automotive Ag Device and method for determining an adjustable variable of an internal combustion engine regulator
WO2006123564A1 (fr) * 2005-05-19 2006-11-23 Toyota Jidosha Kabushiki Kaisha Dispositif de purification des gaz d'echappement pour moteur a combustion interne
WO2007066209A1 (fr) * 2005-12-08 2007-06-14 Toyota Jidosha Kabushiki Kaisha Appareil et procede pour commander le rapport air-carburant dans un moteur a combustion interne
US7597091B2 (en) 2005-12-08 2009-10-06 Toyota Jidosha Kabushiki Kaisha Air-fuel ratio control apparatus and method for an internal combustion engine
CN101326356B (zh) * 2005-12-08 2012-10-24 丰田自动车株式会社 用于内燃发动机的空燃比控制装置和方法
WO2007099429A1 (fr) * 2006-02-28 2007-09-07 Toyota Jidosha Kabushiki Kaisha Système de purification des gaz d'échappement pour un moteur à combustion interne et procédé de commande du système de purification des gaz d'échappement
US8161729B2 (en) 2006-02-28 2012-04-24 Toyota Jidosha Kabushiki Kaisha Exhaust purification system for internal combustion engine and control method of the exhaust purification system

Also Published As

Publication number Publication date
DE10147491A1 (de) 2003-04-24
JP4223772B2 (ja) 2009-02-12
JP2003120383A (ja) 2003-04-23
EP1298304A3 (fr) 2006-01-18

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