CN107917005A - Method and control device for regulating the oxygen charge of a three-way catalyst - Google Patents

Method and control device for regulating the oxygen charge of a three-way catalyst Download PDF

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Publication number
CN107917005A
CN107917005A CN201710934463.9A CN201710934463A CN107917005A CN 107917005 A CN107917005 A CN 107917005A CN 201710934463 A CN201710934463 A CN 201710934463A CN 107917005 A CN107917005 A CN 107917005A
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oxygen
exhaust gas
catalyzing unit
ternary catalyzing
filling
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CN107917005B (en
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M.法伊
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Robert Bosch GmbH
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Robert Bosch GmbH
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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
    • F02D41/1444—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
    • 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
    • F01N3/101—Three-way catalysts
    • 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
    • F01N3/20—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 specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • 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
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • 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
    • 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
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • F02D41/0295—Control according to the amount of oxygen that is stored on the exhaust gas treating apparatus
    • 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
    • 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
    • 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
    • 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
    • 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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
    • F01N2560/025—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting O2, e.g. lambda sensors
    • 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
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
    • F01N2900/1624—Catalyst oxygen storage capacity
    • 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
    • F02D2041/1433—Introducing closed-loop corrections characterised by the control or regulation method using a model or simulation of the system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/08—Exhaust gas treatment apparatus parameters
    • F02D2200/0814—Oxygen storage amount
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/08—Exhaust gas treatment apparatus parameters
    • F02D2200/0816—Oxygen storage capacity

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  • 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)
  • Materials Engineering (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

The invention relates to a method for regulating the oxygen charge of a three-way catalyst in an exhaust gas channel of an internal combustion engine, wherein the oxygen content of the exhaust gas upstream of the three-way catalyst is determined using a first skip lambda sensor, wherein tolerance effects and aging effects, which lead to a deviation of the actual sensor characteristic from a reference sensor characteristic, are taken into account and corrected, wherein the oxygen charge of the three-way catalyst is modeled. And also to a control device for carrying out said method. According to the invention, the oxygen intake into the three-way catalytic converter and/or the oxygen exhaust from the three-way catalytic converter is determined from the corrected output signal of the first jump lambda sensor, and the oxygen filling of the three-way catalytic converter is modeled. By modeling the filling of the three-way catalyst, its filling level can be set such that it can also be operated in its optimum conversion capacity range during the dynamically occurring lean or rich phase due to its oxygen storage capacity.

Description

Method and control device for the oxygen-filling for adjusting ternary catalyzing unit
Background technology
The present invention relates to a kind of oxygen for being used to adjust the ternary catalyzing unit in internal combustion engine, guiding exhaust gas exhaust steam passage The method of gas-filling, wherein, the oxygen content of the exhaust gas before the ternary catalyzing unit utilizes the first jump-λ （Lambda）Sensor is determined, wherein, tolerance effect and aging effect are taken into account and are corrected, the tolerance effect and Aging effect causes offset of the actual sensor characteristic relative to benchmark-sensor characteristic, and wherein, it is described The oxygen filling of ternary catalyzing unit is modeled.
In addition, it is used to adjust the three-element catalytic in internal combustion engine, guiding exhaust gas exhaust steam passage the present invention relates to a kind of The control device of oxygen-filling of device, wherein, in order to determine the oxygen content of the exhaust gas before the ternary catalyzing unit, First jump-exhaust gas oxygensensor is set, wherein, the variation in the output signal of first jump-exhaust gas oxygensensor is known Not and it is corrected, wherein, offset caused by the offset of the sensor characteristic, λ=1 point and temperature is corrected, Wherein, first jump-exhaust gas oxygensensor relative to exhaust gas constituents cross sensitivity（Querempfindlichkeit）Examined Consider, and wherein, the model that the oxygen for modeling the ternary catalyzing unit fills is arranged in the control device.
In air-fuel-mixture imperfect combustion in internal combustion engine, except nitrogen（N2）, carbon dioxide（CO2）With Water（H2O）, a large amount of combustion products are discharged, in the combustion product, hydrocarbon（HC）, carbon monoxide（CO）With nitrogen oxygen Compound（NOX）Legally limited., can be only sharp suitable for the exhaust gas limiting value of motor vehicle according to the current prior art It is observed with catalytic exhaust post processing.By using ternary catalyzing unit in the exhaust steam passage of internal combustion engine, what is be previously mentioned is harmful Material composition can be converted into nitrogen, carbon dioxide and water.
For ternary catalyzing unit, for HC, CO and NOX, simultaneously high conversion ratio is only around stoichiometry Operating point（λ=1）, narrow λ scopes（So-called catalyst converter window）In be implemented.Only there is balance herein, it is described flat Weighing apparatus is for HC and the oxygen demand of the oxidation of CO and by NOXReduction produce oxygen supply between balance.In order to Catalyst converter is run in catalyst converter window, typically, λ adjusters are used in current engine control system, and the λ is adjusted Signal of the device based on the exhaust gas oxygensensor before the ternary catalyzing unit and after the ternary catalyzing unit.It is being catalyzed to adjust λ before device, the oxygen content of the exhaust gas before catalyst converter are measured using the exhaust gas oxygensensor.According to this measured value, the tune Save amount of fuel of the device correction from Proctor Central.Adjusted in order to more accurate, additionally, the exhaust gas utilization after catalyst converter is in addition Exhaust gas oxygensensor be analyzed.This signal is used for guide adjustment, and the guide adjustment is superimposed on the λ before the catalyst converter In adjusting.In general, jump-exhaust gas oxygensensor is used as the exhaust gas oxygensensor after catalyst converter, the jump-exhaust gas oxygensensor has in λ=1 Very precipitous characteristic curve, also, therefore can highly precisely show λ=1.
Current adjusted design has the disadvantage in that：They can be compared with by the signal of jump-exhaust gas oxygensensor after catalyst converter Leaving for catalyst converter window is identified lately.For signal, the described ternary catalyzing unit based on the exhaust gas oxygensensor after catalyst converter The alternative solution of adjusting is to adjust oxygen-fill level of the catalyst converter.In currently used catalyst converter, cerium oxide （Ceroxid）On catalyst converter, porous carrier material, contained according to oxygen（Sauerstoffvorkommen）, it is described Carrier material can exist in different oxidation stages.The oxygen of oxygen storage material occurs in the thin operation of engine Change, and this is reduced again in dense operation.In this way, the oxygen excess or oxygen in exhaust-gas mixture lack according to oxygen Storage volume and catalyst converter, current oxygen-filling can be compensated fully or partly, this causes with regard to non-ization Learn conversion performance catalyst converter, significantly improving for the exhaust gas composition of metering.Therefore, to the oxygen of ternary catalyzing unit-fill The adjusting of note causes the clean-up performance of lifting.
Oxygen-filling or oxygen-fill level due to the ternary catalyzing unit can not be measured, so this tittle It is modeled.Modeling for the fill level, measurements of the exhaust gas λ in the wide scope near λ=1 before catalyst converter are It is required.Therefore, broadband-sensor is typically used before catalyst converter.
Known one kind, which is used to run, from document DE102013017260B3 has internal combustion engine and catalyst converter（3）Driving dress Put（1）Method, the catalyst converter is used to clean the exhaust gas of the internal combustion engine, wherein, the first exhaust gas oxygensensor（5）It is arranged on institute State catalyst converter（3）Upstream and the second exhaust gas oxygensensor（6）It is arranged on the catalyst converter（3）Downstream, the first λ sensing Device provides the first λ signals, and second exhaust gas oxygensensor provides the 2nd λ signals, and wherein, λ guide adjustments are by the first λ Signal and λ fine setting adjustings（Lambdatrimmregelung）It is performed by the 2nd λ signals, the λ fine settings adjust quilt It is superimposed to the λ guide adjustments.Here, it is provided with, adjuster（7）With the modeling catalyst converter（3）Observer（8）It is used for λ fine setting is adjusted, wherein, rated value and by the observer（8）Acquired model error is supplied as input quantity To the extremely adjuster（7）, also, by the adjuster（7）Acquired controlled quentity controlled variable is supplied to described as input quantity Observer（8）.In addition, the present invention relates to a kind of driving device（1）.
Document DE102006061684A1 discloses a kind of oxygen filling water for being used to adjust engine exhaust gas cleaning equipment Flat method, wherein, set along exhaust gas flow direction before waste gas cleaning equipment using the first exhaust gas analyzer probe and in exhaust gas cleaning It is standby to be formed afterwards using the second exhaust gas analyzer probe measurement exhaust gas, wherein it is determined that the oxygen introduction volume into the waste gas cleaning equipment （Sauerstoff-Eintrag）, and amount of oxygen is added into or is incorporated into, and wherein, in previously given limiting value Between to before waste gas cleaning equipment exhaust gas composition be modulated（modulieren）.It is arranged according to the present invention, it is clear to exhaust gas Clean equipment（16）The modulation of preceding exhaust gas composition is so performed so that is tied when amount of oxygen reaches predetermined higher extreme value The thin adjusting of beam exhaust gas composition, also, terminate dense adjusting when amount of oxygen reaches predetermined low extreme value.
Document DE010339063Al has described a kind of for utilizing catalyst converter and the oxygen for being arranged in the catalyst converter downstream The sensor method that mixture is adjusted in internal combustion engine, the catalyst converter are disposed in the exhaust gas apparatus of the internal combustion engine, have There is oxygen storage capability, wherein, the model of the oxygen storage capability is set, and the model is according to input-λ value and catalysis The value of the oxygen filling of catalyst converter described in device-parameter value calculation.It is provided with：Depending on the oxygen filling and by the oxygen Sensor obtains, dense disconnection at the catalyst converter or thin disconnection（Fett- oder Magerdurchbruch）'s Depending on the value calculated, mixture is replaced and is activated.In DE010339063Al, to oxygen-fill level of the catalyst converter Modeling be set, without using before the catalyst converter it is jump-exhaust gas oxygensensor, correction output signal.
Document DE102014211941Al has been described for assessing λ signals（lam_2）Method, the λ signals sense by λ Device（18）There is provided using the characteristic curve for shape of jumping, the exhaust gas oxygensensor is disposed in catalyst converter（14）After downstream, the catalysis Device is disposed in internal combustion engine（10）Exhaust steam passage（12）In.It is arranged according to the present invention, the λ signals（lam_2）It is differentiated, The signal of the differential（36）Absolute value be formed, the signal of the differential（36）Amount signal（40）The quilt on the duration Integration, integral result（44）With integration-threshold value（I_SW）Compare, also, when more than threshold value, the combustion of air-fuel-mixture Material share is enhanced, and the air-fuel-mixture is supplied to the internal combustion engine（10）.In document E102014211941A1 In, jump sensor is disposed in after catalyst converter, and the signal of the jump sensor is assessed with being modified.
A kind of known method for identifying variation, the variation are from document DE102012211687Al Voltage-λ-characteristic curve of jump-exhaust gas oxygensensor at least in the exhaust steam passage of internal combustion engine is arranged in is relative to the jump-λ Variation in the benchmark of sensor-voltage-λ-characteristic scope, wherein, the jump-exhaust gas oxygensensor is to be used to set The component in the adjusting path of the air/fuel mixture conveyed to internal combustion engine is put, wherein, the voltage-λ-characteristic curve is opposite Be corrected in the benchmark in the case of λ=1-voltage-λ-characteristic characteristic curve deviation, wherein, from the benchmark- It is on voltage-λ-characteristic curve, with λ and voltage to be detected to be detected value to be detected to setting out, towards λ=1 carry out to The change of the component of the air/fuel mixture of the internal combustion engine conveying, and wherein, from the air/fuel mixture Component until reaching the change of λ=1 in be inferred to actual λ value.It is arranged according to the present invention, in first method step really The fixed time delay for adjusting path, in second method step, from value to be detected, carry out the air/combustion Expect mixture component until λ=1 change, by the component change using it is described adjusting path time delay progress To correct, the actual λ value of described value centering determines in the change being corrected of the component from the air/fuel mixture, And voltage-λ-characteristic the variation is identified from the deviation of the actual λ value and λ value to be detected.
Document DE102014210442A1 has described a kind of be used in deviation benchmark-voltage-λ-indicatrix（35）Shi Tong Cross adaptation and carry out exhaust passage of the correction arrangement in internal combustion engine（17）In jump-exhaust gas oxygensensor（15、18）Voltage-λ-feature it is bent Line（36）Method.It is arranged according to the present invention, implement the adaptation when internal combustion engine is not run, wherein, heated in conveying Jump-the exhaust gas oxygensensor is checked in the case of power（15、18）, nominal value depending on temperature.
The task of the present invention is a kind of method is provided, the method utilizes jump before ternary catalyzing unit, cost advantages The output signal of jump-exhaust gas oxygensensor realizes adjusting oxygen-fill level, based on model of ternary catalyzing unit.
In addition, the task of the present invention is a kind of control device is provided, the control device is adapted for carrying out the method.
The content of the invention
Task of the invention, to be related to the method is solved, and passes through the correction from first jump-exhaust gas oxygensensor Export and determine to enter oxygen-introduction volume in the ternary catalyzing unit and/or oxygen-row from the ternary catalyzing unit in signal Output, also, by therefrom modeling the oxygen-filling of the ternary catalyzing unit.The institute of first jump-exhaust gas oxygensensor State output signal the correction in terms of tolerance effect and aging effect show it is in wide λ scopes, in the sensor signal Relation between the λ value of the exhaust gas, clear and definite, the tolerance effect and the aging effect cause real sensor Characteristic curve relative to benchmark-sensor characteristic of jump-exhaust gas oxygensensor of not-aging offset, it is described not-aging Jump-exhaust gas oxygensensor has the jump-λ characteristic curves according to data page.Therefore, jump-exhaust gas oxygensensor of cost advantages can be by Enter oxygen-introduction volume in the ternary catalyzing unit and oxygen-discharge rate from the ternary catalyzing unit for balancing, and And oxygen-the filling in the ternary catalyzing unit or the oxygen-fill level can be modeled by these values.Especially Its ground, it is not necessary to consider to be arranged in the output signal of jump-exhaust gas oxygensensor after the ternary catalyzing unit, only when it is thin-disconnect or Person is dense-and disconnect and occurring and when the conversion capability of the ternary catalyzing unit has been significantly reduced, the output signal ability Enough display reactions.The correction to the tolerance effect and aging effect exists either alone or in combination according to known method Carried out in following step：
- adaptation the sensor characteristic, constant offset
The offset of the λ=1 point of-compensation sensor characteristic
Offset caused by the temperature of-compensation sensor characteristic
- consider the cross sensitivity of current exhaust gas composition and the Abgassensor relative to different exhaust gas constituents.
The sensor characteristic, suitable correction can be performed by following manner：For alignment tolerances Effect and aging effect, the variation in the output signal of first jump-exhaust gas oxygensensor are identified and are corrected, Offset is corrected caused by the offset of λ=1 point of the sensor characteristic and temperature, also, the first jump-λ is passed Sensor is considered relative to the cross sensitivity of exhaust gas constituents.
A kind of preferable scheme of the method is provided with：The oxygen filling of the ternary catalyzing unit is so adjusted Section so that avoid leave can be previously given filling-window.Filling-the window is so selected so that just described For the input of dense or thin exhaust gas during the dynamic change of the service condition of internal combustion engine, due to the three-element catalytic For the oxygen-storage capacity of device there are buffer, on the one hand the buffer can absorb oxygen in thin condition, and And on the other hand can release oxygen in dense exhaust gas so that exhaust gas cleaning in the ternary catalyzing unit in λ=1 into OK.Using current oxygen-fill level of known, the described ternary catalyzing unit from the model, the exhaust gas forms energy It is enough to be adjusted ahead of time so that always to have enough buffers for using.
It is provided with a kind of scheme of the method：The ternary catalyzing unit is divided into two or more regions, right Oxygen-filling is modeled respectively in the region.Thus, filling-process and emptying-process can be built with the accuracy of higher Mould.Advantageously, the fill level in single region is standardized to regional, current oxygen storage capability.It is described each The fill level in region（If necessary, after weighting）It is scaled average fill level.Using weighting, it is contemplated that , the fill level in the less scope in the exit of the ternary catalyzing unit is for after the ternary catalyzing unit , instantaneous exhaust gas composition be conclusive.Described in this less scope in the exit of the catalyst converter The development of fill level, the development of the fill level and the fill level in volume before it is with decisive significance 's.This average fill level is adjusted to rated value, the rated value by after thin and it is dense after disconnection （Durchbruch）Possibility minimize, also, so cause minimum discharge capacity.
Set in another scheme of the method：The catalyst converter model of the ternary catalyzing unit is by the second jump-λ The output signal of sensor is calibrated, and second jump-exhaust gas oxygensensor is disposed in after the ternary catalyzing unit.Described Two jumps-exhaust gas oxygensensor is shown, when the ternary catalyzing unit is completely filled with oxygen or is drained completely.This is utilized, so as to Made oxygen-fill level of modeling consistent with actual oxygen-fill level according to thin-stage or dense-stage, also, To be adapted to the catalyst converter model if necessary.
Task of the invention, to be related to control device is solved by following manner：In the control device, from described The correction of first jump-exhaust gas oxygensensor output signal in set enter the ternary catalyzing unit in oxygen-introduction volume and/ Or the balance of oxygen-discharge rate from the ternary catalyzing unit, also, the oxygen to the ternary catalyzing unit is therefrom set Gas-filling determines.
Hereinafter, the present invention is explained in more detail by the embodiment being shown in the drawings.Attached drawing is shown：
Fig. 1 shows technological accumulation and inheritance in the diagram, and the method can be used in the technological accumulation and inheritance；
The schematic diagram that Fig. 2 is adjusted according to the present invention.
Fig. 1 schematically shows technological accumulation and inheritance, and the method according to the invention can be used in the technological accumulation and inheritance.It is interior Combustion engine 10 obtains the combustion air conveyed by feeder 11, and the internal combustion engine is implemented as the gasoline engine of spark ignition type Machine.Here, the air quality of combustion air can be determined by the air-flow sensors 12 in feeder 11.Institute The air quality of conveying is used to determine fuel quantity to be batched for the λ value that can be controlled in advance.In addition, exhaust gas parameters（Especially It is exhaust mass stream and the exhaust mass therefrom derived）It is determined by the air quality.The exhaust gas of internal combustion engine 10 It is exported by exhaust steam passage 15, ternary catalyzing unit 16 is disposed in the exhaust steam passage.In addition, in exhaust steam passage 15, 17 quilt of the first jump-exhaust gas oxygensensor 14 before ternary catalyzing unit 16 and the second jump after ternary catalyzing unit 16-exhaust gas oxygensensor Arrangement, the signal of the jump-exhaust gas oxygensensor are transported to control device 20.In addition, the signal of air-flow sensors 12 is defeated Send to control device 20.On the basis of the signal of the air quality and jump-exhaust gas oxygensensor 14,17 so obtained, controlling In device 20, fuel mass is determined, and the fuel mass is supplied to internal combustion engine 10 by fuel-meter 13.For this reason, control Device 20 processed includes Proctor Central and regulating device, and the regulating device is used for the base in the signal of jump-exhaust gas oxygensensor 14,17 The composition of air-fuel-mixture is adjusted on plinth.
Fig. 2 shows the schematic diagram adjusted according to the present invention.The reference numeral used in Fig. 1 is in fig. 2 with same The numeral of sample is labeled.Internal combustion engine 10 is connected with ternary catalyzing unit 16 by exhaust steam passage 15 and is hereafter connected with the external world. Between internal combustion engine 10, the first jump-exhaust gas oxygensensor 14 is disposed in exhaust steam passage 15.After ternary catalyzing unit 16, second Jump-exhaust gas oxygensensor 17 is disposed in exhaust steam passage 15.Control to internal combustion engine 10 is summarised in control device 20. During the λ known is adjusted, in signal prepares device 29, the first jump-exhaust gas oxygensensor 14 output signal is on sensor characteristic , constant offset is corrected in control device 20.In addition, offset and the temperature of sensor characteristic, λ=1 point Caused offset is compensated.Finally, current exhaust gas composition and Abgassensor relative to different waste gas components transverse direction Sensitivity is considered.The signal so corrected is transported to λ adjusters 24, and the λ adjusters adjust air-fuel-mixture Composition, the air-fuel-mixture is transported to internal combustion engine 10.In guide adjustment device 21, the second jump-exhaust gas oxygensensor 17 output signal is evaluated, so to correct λ adjusters 24 so that average upper maintenance λ=1, desired λ value.
Fill level adjuster 30 within control device 20, according to the present invention adjusts the oxygen of ternary catalyzing unit 16 Gas-fill level.For this reason, signal preparation device 29 exports signal after the signal correction using guide adjustment device 21 in differential levels In be supplied to discharge model 27.In model 27 is discharged, the sensor signal of correction is converted into λ value either one or more A amount therefrom derived.Here, advantageously, λ value is converted into the concentration of one or more waste gas component.For example, λ value energy Enough it is converted into the value for oxygen and carbon monoxide the concentration before ternary catalyzing unit 16.Discharge the output of model 27 Value or the λ value directly corrected are supplied to catalyst converter model 25.In catalyst converter model 25, the filling water of ternary catalyzing unit 16 It is flat to be modeled.In particular, the balance of oxygen-introduction volume and oxygen-discharge rate is set, to model oxygen-fill level.Have Profit, the kinetics of exhaust gas part calculated by the discharge model is considered in modeling.It is in addition, favourable , ternary catalyzing unit 16 is divided into multiple regions, fill level is modeled respectively in this region.Thus, filling-process Can more realistically it be depicted with emptying-process.Advantageously, standardization is each for adjusting for catalyst converter-fill level The fill level in region.The fill level of regional（If necessary, after weighting）It is converted into being averaged for ternary catalyzing unit 16 Fill level.It can be considered using weighting, filling out in the relatively small scope in the exit of ternary catalyzing unit 16 It is conclusive that water-filling, which is put down for exhaust gas composition behind ternary catalyzing unit 16, instantaneous,.Filling out in this small scope The flat development of water-filling is by the influence on development of existing catalyst converter volume and the catalyst converter volume before it.Ternary catalyzing unit 16 , average fill level is filled level governor 30 and adjusts to such rated value so that after thin and it is dense after The possibility of disconnection be minimized in the exit of ternary catalyzing unit 16.Thus, the discharge of internal combustion engine 10 is minimized, described It is discharged into up to the external world.
When needed, catalyst converter model 25 can pass through calibrator 26 by the output signal of the second jump-exhaust gas oxygensensor 17 It is calibrated, second jump-exhaust gas oxygensensor 17 is disposed in after ternary catalyzing unit 16.Second jump-exhaust gas oxygensensor 17 it is defeated Go out signal to show, when ternary catalyzing unit 16 is completely filled with oxygen or is emptied completely oxygen.This can be employed, so as to dilute It is thin-or dense-stage after make modeling oxygen-fill level and reality oxygen-fill level it is consistent, also, needing When be adapted to catalyst converter model 25.Thus, the unfailing performance of catalyst converter model 25 accesses raising.
The fill level of ternary catalyzing unit 16 is transferred to fill level adjuster 22, the filling water by catalyst converter model 25 Flat regulator is adapted for the rated value of λ controllers 24 by summing stage 23 together with the output signal of guide adjustment device 21.

Claims (6)

1. for adjusting in internal combustion engine（10）, guiding exhaust gas exhaust steam passage（15）In ternary catalyzing unit（16）Oxygen- The method of filling, wherein, in the ternary catalyzing unit（16）The oxygen content of the exhaust gas before is passed using the first jump-λ Sensor（14）Determine, wherein, it is contemplated that and alignment tolerances effect and aging effect, the tolerance effect and aging effect cause Actual sensor characteristic relative to benchmark-sensor characteristic offset, and wherein, to the ternary catalyzing unit （16）The oxygen filling be modeled, it is characterised in that from first jump-exhaust gas oxygensensor（14）Correction output In signal, determine to enter the ternary catalyzing unit（16）In oxygen-introduction volume and/or from the ternary catalyzing unit（16）Oxygen Gas-discharge rate, also, therefrom to the ternary catalyzing unit（16）The oxygen-filling be modeled.
2. according to the method described in claim 1, it is characterized in that, for alignment tolerances effect and aging effect, identify and Correction is in first jump-exhaust gas oxygensensor（14）Output signal in variation, correct the sensor characteristic , offset caused by the offset of the point of λ=1 and temperature, also, consider the first jump-exhaust gas oxygensensor（14）Relative to useless The cross sensitivity of gas component.
3. according to claim 1 or claim 2, it is characterised in that so adjust the ternary catalyzing unit（16）Institute State oxygen-filling so that avoid leaving filling-window that can be previously given.
4. according to the method in any one of claims 1 to 3, it is characterised in that the ternary catalyzing unit（16）It is divided into two A or multiple regions, oxygen-filling is modeled for the region respectively.
5. method according to any one of claim 1 to 4, it is characterised in that the ternary catalyzing unit（16）Catalysis Device model（25）By the second jump-exhaust gas oxygensensor（17）Output signal calibrated, second jump-exhaust gas oxygensensor is by cloth Put in the ternary catalyzing unit（16）Afterwards.
6. for adjusting in internal combustion engine（10）, guiding exhaust gas exhaust steam passage（15）In ternary catalyzing unit（16）Oxygen- The control device of filling（20）, wherein, in order to determine in the ternary catalyzing unit（16）The oxygen content of the exhaust gas before, First jump-exhaust gas oxygensensor（14）It is set, wherein, tolerance effect and aging effect are taken into account and are corrected, the tolerance Effect and aging effect cause offset of the actual sensor characteristic relative to benchmark-sensor characteristic, and its In, for modeling the ternary catalyzing unit（16）Oxygen filling model be arranged in the control device, its feature exists In in the control device, into the ternary catalyzing unit（16）In it is oxygen-introduction volume and/or urged from the ternary Change device（16）Oxygen-discharge rate balance from first jump-exhaust gas oxygensensor（14）Correction output signal in set Put, also, therefrom to the ternary catalyzing unit（16）The definite of oxygen-filling be set.
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