EP1336742A2 - Méthode pour stimuler une boucle de régulation lambda - Google Patents

Méthode pour stimuler une boucle de régulation lambda Download PDF

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Publication number
EP1336742A2
EP1336742A2 EP03002339A EP03002339A EP1336742A2 EP 1336742 A2 EP1336742 A2 EP 1336742A2 EP 03002339 A EP03002339 A EP 03002339A EP 03002339 A EP03002339 A EP 03002339A EP 1336742 A2 EP1336742 A2 EP 1336742A2
Authority
EP
European Patent Office
Prior art keywords
amplitude
frequency
operating temperature
lambda
values
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
EP03002339A
Other languages
German (de)
English (en)
Other versions
EP1336742B1 (fr
EP1336742A3 (fr
Inventor
Dietmar Ellmer
Thorsten Lauer
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of EP1336742A2 publication Critical patent/EP1336742A2/fr
Publication of EP1336742A3 publication Critical patent/EP1336742A3/fr
Application granted granted Critical
Publication of EP1336742B1 publication Critical patent/EP1336742B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F02D41/1493—Details
    • F02D41/1495—Detection of abnormalities in the air/fuel ratio feedback system
    • 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
    • F02D41/1408—Dithering techniques
    • 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

Definitions

  • the invention relates to a method for positive excitation Lambda control with which an error in a lambda probe is detected becomes.
  • a Diagnosed Lambda probe located upstream of a catalyst.
  • the lambda probe to be diagnosed has a constant characteristic in its output signal.
  • the lambda probe becomes a periodic lambda setpoint Forced excitation with a given frequency and amplitude superimposed.
  • a model of the lambda control loop forms its line behavior, with one of the model parameters represents the sensor delay time. From the amplifications of the amplitudes, which are for the model and system for forced excitation result, the model values, especially the model value adapted for the sensor delay time.
  • the lambda sensor is recognized as defective if the value for the change in the model parameter has a predetermined threshold exceeds. This means that if you are too strong Adaptation of the sensor delay time is a malfunction of the Lambda sensor is recognized. This way it can be continuous the functioning of the lambda probe in the lambda control circuit be checked.
  • the stoichiometric setpoint for the air ratio is subjected to a positive excitation.
  • the deviation from the stoichiometric setpoint alternately have a lean and fat shift.
  • the oxygen storage of the catalyst is filled, O 2 is stored, while the catalyst is emptied again during the fat shift.
  • This filling and emptying process depends on the setpoint shift (amplitude of the forced excitation) and the duration of the shift. It is known to carry out the forced stimulation in a time-based approach with the same amplitude and the same duration for fat and lean stimulation.
  • the invention has for its object a method for Forced excitation of a lambda probe in an internal combustion engine provide that is not detrimental to exhaust emissions affects and a good exhaust gas conversion over wide operating areas ensures.
  • the values for amplitude are selected and frequency of the forced excitation depending on an operating temperature the internal combustion engine.
  • This solution of the invention The task is based on the knowledge that the known forced excitation for some operating conditions to a leads to poor conversion of the exhaust gases.
  • By amplitude and frequency of the forced excitation adapted to the operating temperature are, according to the invention, also in low load and Idling range and increased exhaust emission values after a cold start avoided.
  • the values for amplitude preferably depend and / or frequency of the forced excitation from the operating temperature of the cooling water. So far it is common for the Amplitude and frequency of the forced excitation relate to a cooling water temperature from 85 ° C.
  • the values for amplitude and / or frequency can also be dependent the temperature of the cylinder head and / or the oil temperature be determined for the forced excitation. Prefers In addition to the operating temperature, the air mass and the speed of predetermined temperature values is taken into account.
  • the one from the internal combustion engine 10 leaked air is in through an exhaust tract 14 in a three-way catalyst 16 passed.
  • a first oxygen probe 18 is provided for catalytic converter 16, whose output signal steadily depends on the air ratio lambda in the Exhaust gas flow depends.
  • the oxygen sensors are also called Called lambda sensors.
  • a second lambda probe 20 is arranged which measures the catalyst efficiency checked and as a linear probe or one so-called jump probe can be formed.
  • the signals from the lambda probes 18 and 20 are sent to a lambda control device 22 forwarded from the two delivered signals on the efficiency of the catalyst 16 and thus concludes the conversion of the exhaust gases.
  • the lambda control device determines a desired lambda value as a manipulated variable and passes this on to the engine control 24. Furthermore, the lambda control device can be a model for the behavior of the control system.
  • the model includes, as a model parameter, the sensor delay time. As known from DE 195 16 239 C2, has the transfer function the lambda control system behaves like series connection two first order delay elements and a dead time link. To make as little change as possible to maintain the exhaust emission during the forced excitation Frequency and amplitude depending on speed and load as well the operating temperature of the internal combustion engine.
  • the lambda setpoint fluctuates with the known forced excitation around the mean 26 at which stoichiometric combustion he follows.
  • the forced excitation can be in a fat part 28 and a lean part 30 can be divided.
  • the amplitudes 32 and 34 of each suggestion are the same size. Own as well the lean and the fat half-wave 28 and 30 respectively same duration 36 or 38.
  • the lambda setpoint is set at 0.998 to reduce the risk of NOx breakthroughs.
  • the forced excitation according to the invention has a lean half-wave 40 with a duration t lean 42 and an amplitude A lean 44.
  • a fat half-wave 46 follows the lean half-wave 40.
  • the bold half-wave 46 has a duration t bold 48 and an amplitude A bold 50.
  • the four parameters characterizing the forced excitation: t lean , A lean , t rich , A rich can be selected independently of one another.
  • a first characteristic map 52 determines the values for a first frequency and a first amplitude as a function of speed and load.
  • the frequency is defined as an inverse period, the period being the time period of a defined exhaust gas sequence of lean and rich exhaust gas packages, which is repeated regularly under steady-state operating conditions (ie with the same amount of exhaust gas per time and the same exhaust gas composition).
  • Lean / rich amplitude is understood to mean the lambda values of individual exhaust gas packets of the exhaust gas packet sequence.
  • the map 52 determines the frequency and amplitude for a first temperature T 1 .
  • the map 54 determines the values for a second frequency and a second amplitude depending on the speed and load.
  • the tuples of frequency and amplitude are forwarded to a calculation unit 56.
  • the calculation unit 56 determines the tuple of nominal values for frequency and amplitude 60 by means of a linear or a non-linear interpolation.
  • the calculation method shown in FIG. 4 can also be carried out by a three-dimensional map can be replaced.
  • the method according to the invention shows particular advantages operating temperature-dependent forced excitation also related in a so-called electronic thermal management, at which the operating temperature of the engine with the aim of a low fuel consumption and good exhaust gas values is varied.
  • thermal management works through a targeted adaptation of the forced control to the operating temperature supported.
  • the limit with which to change the model parameter selected in a preferred embodiment also depends on the operating temperature.
  • the Limit value of the speed and the load of the internal combustion engine depend.
  • a square wave or a sinusoidal vibration can be used. Is also it is possible to use excitation with a sawtooth To provide vibration or another excitation pattern.
  • the sawtooth-shaped vibration is by amplitude, frequency and Marked rise time.
  • the rise time can also be the inventive method depending on the operating temperature to get voted.

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)
EP20030002339 2002-02-18 2003-02-03 Méthode pour stimuler une boucle de régulation lambda Expired - Lifetime EP1336742B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10206675 2002-02-18
DE2002106675 DE10206675C1 (de) 2002-02-18 2002-02-18 Verfahren zur Zwangsanregung bei einer Lambdaregelug

Publications (3)

Publication Number Publication Date
EP1336742A2 true EP1336742A2 (fr) 2003-08-20
EP1336742A3 EP1336742A3 (fr) 2006-03-15
EP1336742B1 EP1336742B1 (fr) 2006-12-20

Family

ID=7713850

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20030002339 Expired - Lifetime EP1336742B1 (fr) 2002-02-18 2003-02-03 Méthode pour stimuler une boucle de régulation lambda

Country Status (2)

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EP (1) EP1336742B1 (fr)
DE (2) DE10206675C1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7275364B2 (en) 2003-03-26 2007-10-02 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Exhaust emission control device of internal combustion engine
DE10358900A1 (de) * 2003-12-16 2005-07-21 Volkswagen Ag Verfahren zum Betreiben einer Brennkraftmaschine mit kontinuierlicher Lambda-Regelung
DE102004038481B3 (de) * 2004-08-07 2005-07-07 Audi Ag Verfahren zur Regelung des einer Brennkraftmaschine zugeführten Luft/Kraftstoffverhältnisses
US7793489B2 (en) * 2005-06-03 2010-09-14 Gm Global Technology Operations, Inc. Fuel control for robust detection of catalytic converter oxygen storage capacity
DE102021120527A1 (de) 2021-08-06 2023-02-09 Ford Global Technologies, Llc Verfahren zum Steuern einer gasbetriebenen Brennkraftmaschine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4344892C2 (de) 1992-12-29 1998-04-23 Honda Motor Co Ltd Luft-Kraftstoff-Verhältnissteuereinrichtung für eine Brennkraftmaschine
DE19844994A1 (de) 1998-09-30 2000-04-06 Siemens Ag Verfahren zur Diagnose einer stetigen Lambdasonde

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5325664A (en) * 1991-10-18 1994-07-05 Honda Giken Kogyo Kabushiki Kaisha System for determining deterioration of catalysts of internal combustion engines
DE19744410C2 (de) * 1997-10-08 2001-06-21 Ford Global Tech Inc Verfahren zur Überwachung der Laufruheregelung eines Verbrennungsmotors

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4344892C2 (de) 1992-12-29 1998-04-23 Honda Motor Co Ltd Luft-Kraftstoff-Verhältnissteuereinrichtung für eine Brennkraftmaschine
DE19844994A1 (de) 1998-09-30 2000-04-06 Siemens Ag Verfahren zur Diagnose einer stetigen Lambdasonde

Also Published As

Publication number Publication date
DE10206675C1 (de) 2003-05-22
EP1336742B1 (fr) 2006-12-20
DE50306001D1 (de) 2007-02-01
EP1336742A3 (fr) 2006-03-15

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