EP2786001A1 - Procédé et dispositif de commande d'un régulateur de carburant - Google Patents

Procédé et dispositif de commande d'un régulateur de carburant

Info

Publication number
EP2786001A1
EP2786001A1 EP12794925.3A EP12794925A EP2786001A1 EP 2786001 A1 EP2786001 A1 EP 2786001A1 EP 12794925 A EP12794925 A EP 12794925A EP 2786001 A1 EP2786001 A1 EP 2786001A1
Authority
EP
European Patent Office
Prior art keywords
lambda
value
exhaust
controller
probe
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
EP12794925.3A
Other languages
German (de)
English (en)
Other versions
EP2786001B1 (fr
Inventor
Hermann Hahn
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.)
Volkswagen AG
Original Assignee
Volkswagen AG
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 Volkswagen AG filed Critical Volkswagen AG
Publication of EP2786001A1 publication Critical patent/EP2786001A1/fr
Application granted granted Critical
Publication of EP2786001B1 publication Critical patent/EP2786001B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • F02D41/1477—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the regulation circuit or part of it,(e.g. comparator, PI regulator, output)
    • F02D41/1483—Proportional component
    • 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
    • F02D41/1454—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 an oxygen content or concentration or the air-fuel ratio
    • 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
    • F02D41/1486—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor with correction for particular operating conditions
    • F02D41/1488—Inhibiting the regulation
    • F02D41/1489—Replacing of the control value by a constant
    • 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
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • F02D2041/1413—Controller structures or design
    • F02D2041/1422—Variable gain or coefficients

Definitions

  • the invention relates to a method for operating an internal combustion engine, wherein an exhaust gas generated by the internal combustion engine is guided over a arranged in an exhaust passage 3-way catalyst.
  • Processes for lambda control in internal combustion engines can be used to reduce the emissions of harmful exhaust gases into the environment.
  • at least one catalyst can be arranged in the exhaust system of the internal combustion engine.
  • a lambda probe can be arranged in the exhaust system of the internal combustion engine.
  • the mixture is operated in stoichiometric operation with a fixed modulation amplitude and frequency alternately slightly rich or slightly lean to increase the cleaning effect of a downstream catalyst.
  • Catalysts according to the current state of the art thus achieve their maximum exhaust gas purification efficiency, if they are applied on average with a lambda value which is slightly less than 1, see Figure 3.
  • the scheme must therefore be able to adjust predetermined shifts in the mean lambda setpoint, for example, by preset delta lambda values or by interventions of a possible trim control behind the catalyst.
  • Gap probes which generate a signal according to the Nernst principle provide a signal, as illustrated by way of example in FIG.
  • this may be, for example, a voltage threshold of about 450mV.
  • FIG. 4 shows in the upper part the course of the probe signal versus time, with the x-axis being set to a threshold value of the jump probe for the stoichiometric point (for example 450 mV).
  • the lower part of FIG. 4 shows a profile of the controller intervention over time.
  • the internal combustion engine is consequently in a rich operating mode and above the x-axes in a lean operating mode.
  • the changeover of the controller if a defined switching point is reached, for example, the 450mV threshold of
  • Probe signal as is the case at the times t1, t3 and t4. It can also be seen how at the time t1, the controller is stopped, and only at time t2, the switching takes place. The same is the case at the time t4, at which the controller is stopped until the time t5.
  • An average lambda deviation in the catalytic converter is only correct if oxygen entry and discharge into the
  • Catalyst are the same on average. This is not only due to the lambda value of the
  • an exhaust gas generated by the internal combustion engine is passed over a 3-way catalyst arranged in the exhaust passage.
  • An O2 sensor detects a variable characteristic of an exhaust lambda in front of the 3-way catalytic converter and forwards it to an engine control unit with integrated controller.
  • a mean exhaust lambda A m is set and the average exhaust lambda A m with a predetermined periodic setpoint variation alternately in the direction of a lean lambda value and a
  • a controller deviation AR between a current controller actual value R1 and a current controller setpoint is formed and a new controller setpoint R2 by adding the 2-fold controller deviation AR to the current controller actual value R1 determined.
  • the average exhaust gas lambda A m in the range from 0.98 to 0.998 and the new controller setpoint value R2 is determined in the transition in the direction of lean lambda value.
  • the invention is based on the finding that an adjustment of the average exhaust lambda A m to a value slightly below 1 takes into account much better dynamic deviations in lambda, if the shift of the average exhaust lambda A m not over the specification of a dead time, but as an offset over the controller is set directly.
  • the current controller actual value R1 at a time t1 at which the lambda probe, in particular jump lambda probe, a threshold value A s crosses toward the lean mode of operation recorded.
  • the remaining lambda deviation AA to the current lambda desired value is detected, that is, the correlating controller deviation AR determined.
  • the latter value is multiplied by 2 and added to the current controller actual value R1 to provide a new controller reference value R2.
  • a control intervention in the direction of lean can take place if, for example, a mean exhaust lambda A m of> 1 is to be specified in trim control downstream of the 3-way catalytic converter.
  • a mean lambda of the setpoint variation of a cycle then results as the sum over the lean and rich modulation half-wave.
  • By shifting 2 * ⁇ at each lean half-wave, on average, exactly the desired deviation from the stoichiometric point for the mean exhaust lambda A m will be established.
  • Preset lambda shifts, control adjustments (for example trim control based on an additional probe behind the catalytic converter) or deviations of the control system can be used
  • the new controller setpoint R2 is determined during the transition in the direction of the rich lambda value.
  • control device for controlling an operation of an internal combustion engine, which is set up for carrying out the method according to the invention.
  • the controller may include a computer-readable control algorithm for performing the method.
  • the control unit is an integral part of the engine control unit.
  • Figure 1 shows a schematic structure of an internal combustion engine with a
  • FIG. 2 shows a characteristic curve of a jump lambda probe
  • FIG. 5 shows a profile of the exhaust lambda and regulator intervention after
  • a method according to the invention for achieving a lambda lambda modulation slightly below ⁇ 1 average exhaust lambda A m .
  • FIG. 1 shows schematically the structure of an internal combustion engine 10 with a downstream exhaust system.
  • the internal combustion engine 10 may be a spark ignition engine (gasoline engine). With regard to their fuel supply, they can have a direct injection fuel supply, so working with internal mixture formation, or have a pilot fuel injection and thus work with external mixture formation.
  • the internal combustion engine 10 can be operated homogeneously, wherein in the entire combustion chamber of a cylinder, there is a homogeneous air-fuel mixture at the ignition point, or in an inhomogeneous mode (stratified charge mode), in which at the time of ignition a comparatively rich air-fuel mixture, especially in the area of a spark plug, is present, which is surrounded by a very lean mixture in the remaining combustion chamber.
  • the internal combustion engine 10 can be operated with different air-fuel mixtures whose composition can be varied in particular in a range around the stoichiometric point around.
  • the exhaust system comprises an exhaust manifold, which merges the exhaust gas of the individual cylinders of the internal combustion engine 10 into an exhaust gas channel 16.
  • various exhaust gas purifying components may be present.
  • Essential within the scope of the present invention is a 3-way catalyst 20 arranged in the exhaust gas duct 16.
  • the 3-way catalyst 20 has a coating of catalytically active components, such as platinum, rhodium and / or palladium, on a porous catalyst support, for example, from Al 2 0 3 , are applied.
  • the coating further comprises a
  • Oxygen storage component such as cerium oxide (Ce0 2 ) and / or zirconium oxide (Zr0 2 ), which determines the oxygen storage capacity (OSC) of the 3-way catalyst 20.
  • OSC oxygen storage capacity
  • the 3-way catalyst 20 can reduce nitrogen oxides NO x to nitrogen N 2 and oxygen 0 2 .
  • stoichiometric or slightly lean operation will be unburned
  • the exhaust duct 16 may contain various sensors, in particular gas and temperature sensors. Shown here is a lambda probe 26, which is arranged at a position close to the engine in the exhaust gas channel 16.
  • the lambda probe 26 may be designed as a jump lambda probe and allows in a known manner the lambda control of the
  • various parameters of the internal combustion engine 10, in particular the engine speed and the engine load are read from the engine control unit 28.
  • the fuel supply as well as the air supply are regulated so that a desired fuel mass and a desired air mass are supplied to a desired air-fuel mixture (the exhaust gas).
  • Solllambda The air-fuel mixture is determined as a function of the operating point of the internal combustion engine 10, in particular the engine speed and the engine load from maps.
  • the internal combustion engine 10 is operated continuously with a mean exhaust lambda A m slightly below the stoichiometric composition, wherein the
  • Internal combustion engine 10 supplied air-fuel ratio with a predetermined oscillation frequency and a predetermined oscillation amplitude around this average lambda value periodically alternately in the direction of a lean lambda value and a
  • the oscillation frequency and the oscillation amplitude are further selected so that a minimum conversion rate of unburned hydrocarbons (HC) and / or carbon monoxide (CO) and / or nitrogen oxides (NO x ) is present at the 3-way catalytic coating 22, wherein the minimum conversion rate of statutory Limit values.
  • the oscillation frequency is determined as a function of a current operating point of the internal combustion engine 10, in particular as a function of the engine load and / or engine rotational speed.
  • the oscillation amplitude can also be determined as a function of the OSC.
  • a controller implemented in the engine control unit 28 thus regulates the operation of the engine
  • Internal combustion engine 10 to represent a desired exhaust target lambda.
  • Controllers automatically influence one or more physical variables to a predetermined level while reducing disturbing influences.
  • controllers within a control loop continuously compare the signal of the setpoint with the measured and returned actual value of the controlled variable and determine from the difference between the two variables
  • Control deviation (control difference) - a manipulated variable which influences the controlled system in such a way that the control deviation becomes a minimum. Because the individual control circuit elements have a time response, the controller must increase the value of the control deviation and at the same time compensate for the time behavior of the path so that the controlled variable reaches the desired value in the desired manner. Incorrectly set controllers make the control loop too slow, lead to a large system deviation or to undamped oscillations of the control system
  • a continuous controller with proportional, integral and optionally differential behavior (PI or PID)
  • P, PI, PD and PID proportional, integral and optionally differential behavior
  • a PID controller therefore consists of the proportions of the P-element, the I-element and the D-element
  • the P-element provides a contribution to the manipulated variable, which is proportional to the system deviation I-element acts by time integration of the control deviation on the manipulated variable with a weighting by the reset time.
  • the D-element is a differentiator, which is only used in conjunction with regulators with P and / or I behavior as a controller. He does not react to the level of the control deviation, but only to the rate of change.
  • Figure 5 According to the lambda modulation is carried out as shown in Figure 5 by way of example.
  • a trace of the probe signal versus time is shown, with the x-axis set at a threshold value of the jump probe for the stoichiometric point (for example, 450 mV).
  • the lower portion of Figure 5 is a course of
  • the controller value is multiplied by the amount of fuel supplied, ie it is directly correlated to the lambda value.
  • the controller actual value R1 is recorded according to the invention.
  • Controller deviation AR is now multiplied by 2 and added to controller actual value R1. This results in the target of the new controller setpoint R2. The controller then continues to run at the parameters intended for the new operating state, until the controller setpoint R2 has been reached. Likewise, at time t4 proceed.
  • Lambda modulation now results as the sum over the lean and rich modulation half-wave, ie in this example as a mean between the times t2 and t3.
  • An average of the average lambdas of successive cycles should then correspond to the desired mean exhaust gas lambda A m. Due to the shift of 2 * ⁇ in the case of one half-wave, on average exactly the desired deviation ⁇ results.
  • a m mean exhaust lambda

Landscapes

  • 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)

Abstract

L'invention concerne un procédé pour faire fonctionner une machine à combustion interne (10). Dans ce procédé, un gaz d'échappement produit par la machine à combustion interne (10) passe sur un catalyseur 3 voies (20) disposé dans le conduit d'échappement (16). Une sonde lambda (26) détecte une grandeur caractéristique du lambda du gaz d'échappement en amont du catalyseur 3 voies (20) et la transmet à un appareil de commande de moteur (28) intégrant un régulateur. En prédéfinissant une valeur de consigne de lambda, le régulateur de l'appareil de commande de moteur (28) ajuste un lambda moyen (λm) du gaz d'échappement et, par une variation périodique de la valeur de consigne, oriente alternativement ce lambda moyen (λm) dans le sens d'un lambda pauvre et d'un lambda riche (modulation du lambda). Lors de la transition en direction du lambda pauvre ou en direction du lambda riche, à un temps (t1) où le signal de la sonde lambda (26) atteint une valeur seuil (λs) prédéfinie, on calcule un écart (ΔR) entre une valeur réelle actuelle (R1) et une valeur de consigne actuelle du régulateur et on détermine une nouvelle valeur de consigne (R2) du régulateur en additionnant le double de l'écart (ΔR) à la valeur réelle actuelle (R1) du régulateur.
EP12794925.3A 2011-11-29 2012-11-23 Procédé et appareil pour contrôler un contrôleur de carburant Active EP2786001B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201110087300 DE102011087300A1 (de) 2011-11-29 2011-11-29 Verfahren zum Betreiben einer Verbrennungskraftmaschine sowie zur Ausführung des Verfahrens eingerichtetes Steuergerät
PCT/EP2012/073473 WO2013079406A1 (fr) 2011-11-29 2012-11-23 Procédé et dispositif de commande d'un régulateur de carburant

Publications (2)

Publication Number Publication Date
EP2786001A1 true EP2786001A1 (fr) 2014-10-08
EP2786001B1 EP2786001B1 (fr) 2015-07-22

Family

ID=47278799

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12794925.3A Active EP2786001B1 (fr) 2011-11-29 2012-11-23 Procédé et appareil pour contrôler un contrôleur de carburant

Country Status (3)

Country Link
EP (1) EP2786001B1 (fr)
DE (1) DE102011087300A1 (fr)
WO (1) WO2013079406A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202015004385U1 (de) * 2015-06-20 2016-11-02 GM Global Technology Operations LLC (n. d. Gesetzen des Staates Delaware) Computerprogramm zum Betrieb eines Antriebssystems
DE102016219689A1 (de) * 2016-10-11 2018-04-12 Robert Bosch Gmbh Verfahren und Steuereinrichtung zur Regelung einer Sauerstoff-Beladung eines Dreiwege-Katalysators

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3259967B2 (ja) * 1990-06-01 2002-02-25 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング 燃料と空気の混合気を適応調節する方法
DE4125154C2 (de) * 1991-07-30 2001-02-22 Bosch Gmbh Robert Verfahren und Einrichtung zur Lambdasonden-Überwachung bei einer Brennkraftmaschine
DE19728926C1 (de) * 1997-07-07 1999-01-21 Bosch Gmbh Robert Verfahren und elektronische Steuereinrichtung zur Nachstartverschiebung der lambda-Regelung bei einem Verbrennungsmotor mit lambda-Regelung
DE10307010B3 (de) * 2003-02-19 2004-05-27 Siemens Ag Verfahren zur Einstellung einer definierten Sauerstoffbeladung mit binärer Lambdaregelung zur Durchführung der Abgaskatalysatordiagnose
DE102004050092B3 (de) * 2004-10-14 2006-04-13 Siemens Ag Verfahren zur Regelung des Lambda-Wertes einer Brennkraftmaschine
DE102006047188B4 (de) * 2006-10-05 2009-09-03 Continental Automotive Gmbh Verfahren und Vorrichtung zum Überwachen einer Abgassonde
JP4256898B2 (ja) * 2007-04-20 2009-04-22 三菱電機株式会社 内燃機関の空燃比制御装置

Non-Patent Citations (1)

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Title
See references of WO2013079406A1 *

Also Published As

Publication number Publication date
DE102011087300A1 (de) 2013-05-29
WO2013079406A8 (fr) 2013-10-31
EP2786001B1 (fr) 2015-07-22
WO2013079406A1 (fr) 2013-06-06

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