CN103967567A - Method For Operating Oxygen Sensor Arrangement In Exhaust Gas System Of Internal Combustion Engine - Google Patents
Method For Operating Oxygen Sensor Arrangement In Exhaust Gas System Of Internal Combustion Engine Download PDFInfo
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- CN103967567A CN103967567A CN201410040094.5A CN201410040094A CN103967567A CN 103967567 A CN103967567 A CN 103967567A CN 201410040094 A CN201410040094 A CN 201410040094A CN 103967567 A CN103967567 A CN 103967567A
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- prober
- air inflow
- catalyst converter
- oxygen
- characteristic curve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- 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
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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
- F02D41/021—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
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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
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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
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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
- F02D41/1456—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 with sensor output signal being linear or quasi-linear with the concentration of oxygen
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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
- F02D41/1493—Details
- F02D41/1495—Detection of abnormalities in the air/fuel ratio feedback system
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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
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
- F02D41/2425—Particular ways of programming the data
- F02D41/2429—Methods of calibrating or learning
- F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
- F02D41/2454—Learning of the air-fuel ratio control
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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
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
- F02D41/2425—Particular ways of programming the data
- F02D41/2429—Methods of calibrating or learning
- F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
- F02D41/2474—Characteristics of sensors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/14—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics having more than one sensor of one kind
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- 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
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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
- 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
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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
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The method involves detecting the values for the diagnosis of active oxygen adjustment, where the former value represents the oxygen storage capacity of a catalyst (12), and the latter value represents the oxygen discharge capacity of the catalyst. A characteristic offset of an oxygen sensor (18) is calculated from the ratio of oxygen storage capacity to oxygen discharge capacity. An adaption of the characteristic offset takes place with a natural frequency control of the catalyst. Independent claims are included for the following: (1) a computer program for executing a method for operating an oxygen sensor arrangement; and (2) a computer program product for executing a method for operating an oxygen sensor arrangement.
Description
Technical field
The present invention relates to a kind of method for operation of combustion engine waste gas system air inflow detector assembly, described air inflow detector assembly has at least one first air inflow prober in catalyst converter upstream and at least one second air inflow prober in catalyst converter downstream.In addition the present invention relates to a kind of computer program and a kind ofly have for implementing the computer program of the program-code of the method.
Background technique
In Modern Internal-Combustion Engine, adopt air inflow prober, it determines the oxygen concentration in engine exhaust gas.In the exhaust steam passage of internal-combustion engine, be provided with one or more catalyst converters of processing again for waste gas.By λ regulating loop, so regulate the air of internal-combustion engine and fuel to supply, what make to reach waste gas processes optimum composition again for waste gas.λ is the ratio of air and fuel at this.λ=1 represents the stoichiometric ratio of air and fuel.When λ <1, people are referred to as rich fuel mix, and it has excess of fuel (air deficiency).When λ >1, people are referred to as poor fuel mixing, and it has excessive oxygen.In practice often with rich a little fuel mix operation of combustion engine.Rich fuel mix is hereinafter also referred to as rich combustion gas, and poor fuel is mixed also referred to as poor gas.
Known multi-form air inflow prober.In so-called two point form air inflow prober, it is also referred to as step type prober or can this holder prober, and characteristic curve o'clock has the decline of jump type in λ=1.Therefore this air inflow prober only allows rich waste gas when with excess of fuel operation of combustion engine and the differentiation between the poor waste gas when moving with excess air substantially.So-called broadband air inflow prober, it is also referred to as stable or linear air inflow prober, realized one around the wide scope of λ=1 in the measurement of λ value in waste gas.Therefore the use of broadband air inflow prober also allows the method for operation of mixing with poor fuel.
The air inflow detector assembly often adopting in I. C. engine exhaust road is included in the broadband air inflow prober of catalyst converter upstream and at the step type prober in catalyst converter downstream.The prober that catalyst converter upstream arranges obtains the oxygen concentration of the waste gas that leaves internal-combustion engine.Based on this measured value, in a regulating loop, regulate the fuel mix for burning.Because prober relates to the part that waste gas is relevant, the correct function of monitoring detector more accurately.The institute that particularly must be presented at the prober that catalyst converter upstream arranges is wrong, and it can cause waste gas to worsen.This relates to more and more, because always stricter in the legal provisions aspect this.At this, must identify very rapidly and correspondingly adjust subsequently mistake.
US-legislation requirement especially, identification and correspondingly adjust the mistake that waste gas is relevant in the adjustment cycle limiting, thus a waste gas subsequently in test period waste gas value be located at effective OBD(onboard diagnostic system) under waste gas boundary value.
One of predetermined error image is the characteristic curve deviation at the broadband air inflow prober of catalyst converter upstream setting.Broadband air inflow prober deviation diagnosis shows the prober offset error of proofreading and correct waste gas.The result of diagnosing by deviation be system matches to error, system keeps waste gas neutral in addition thus.The prober offset error that identification if possible exists in the scope of diagnosis.In the scope of coupling, can adjust this error, namely with enough precision study, thus tuning detector deviation.
In this difficulty, this diagnosis and coupling must be implemented very rapidly.Conventionally be only difficult at present can only one realize diagnosis and coupling in adjusting test period.This is no longer being accepted chronically in the future under the background of more and more stricter rules.By at present available measure, can for example in air inflow prober characteristic curve deviation, only with very large cost and in the situation that being everlasting loss robustness, realize this requirement.
In addition, following legislation of diagnostic function is required always more often to need on purpose to intervene on one's own initiative in the duty of engine, for example the air inflow in the dynamic diagnosis of air inflow prober regulates.Such diagnosis must confirm in a test period, wherein in the program control of diagnosis, produces goal conflict.The time mainly for this reason needing is problematic.
Summary of the invention
Relatively, task as basis of the present invention is, provide a kind of for moving the method for air inflow detector assembly, particularly a kind of for diagnosing and mate the method for the characteristic curve offset error of air inflow prober, the method is considered aspect the time in implementing diagnosis and coupling.The method should particularly shorten the time needing for deviation diagnosis.Win in this way the time, to can for example implement other diagnosis of the member that waste gas is relevant, thereby particularly can meet legal provisions.
This task solves for moving the method for air inflow detector assembly by a kind of, if the method is by known to claim 1.The preferred design of the method results from dependent claims.
Provide according to method of the present invention for operation of combustion engine waste gas system air inflow detector assembly.At this, be provided with at least one first air inflow prober in catalyst converter upstream and at least one second air inflow prober in catalyst converter downstream.Described the second air inflow prober is step type prober or can this holds in the palm prober.About the first air inflow prober of catalyst converter upstream, implement the diagnosis of characteristic curve deviation.Carry out if desired coupling or the correction of characteristic curve offset error.In order diagnosing, according to the present invention, when the air inflow activating regulates, to obtain and represent the oxygen storage capacity of described catalyst converter or an amount of ability (OSC) and represent that the oxygen of described catalyst converter emits another amount of capacity or ability (RSC).The ratio of emitting ability by oxygen storage capacity and the oxygen of catalyst converter is calculated the characteristic curve deviation of described the first air inflow prober.The method allows the very large shortening of Diagnostic Time with respect to conventional diagnostic method.Recognition detector offset error very rapidly.Therefore the special advantage that the method has is, provide the significantly more time for mating step or other diagnosis, thereby it is possible for example about legislation, requiring to keep the waste gas boundary value of requirement in the mode of significantly optimizing.If detect prober deviation by means of obtaining of OSC and RSC, can or regulate by the known coupling of activation self and adjust the remainder error existing so, thereby system can be adjusted to waste gas neutrality very rapidly about the prober deviation of the prober in catalyst converter upstream.
Oxygen storage capacity OSC and oxygen are emitted the identical physical descriptor that ability RSC has described catalyst converter, and it is measured in a different manner.The capacity of oxygen storage capacity or catalyst converter has the fixed proportion of emitting ability or capacity with oxygen thus.This ratio particularly depends on the ageing state of catalyst temperature, catalyst converter type and catalyst converter.If the difference between OSC and RSC is confirmable under definite catalyst converter under definite state, this can be owing to the deviation of the air inflow prober arranging in catalyst converter upstream so.Can infer the characteristic curve deviation of the prober arranging in the upstream of catalyzer and calculate this deviation by the difference between OSC and RSC in the sense of the present invention thus.Can be by detect reliably only relative large prober deviation according to method of the present invention based on OSC and RSC and for example catalyst temperature and the aging relation of catalyst converter.1% to 2% deviation can cause surpassing waste gas boundary value at this, thereby meticulous coupling so is subsequently necessary.
According to a preferred design proposal of method of the present invention, measure described oxygen storage capacity OSC, its method is first to carry out by move the pretreatment of catalyst converter described in described internal-combustion engine with rich fuel mixture.Carry out subsequently the operation with lean fuel mixture.Integration by Oxygen Flow when moving described internal-combustion engine with lean mixture can obtain OSC until be placed on the jump (rich to poor) of the second air inflow prober of described catalyst converter.
Preferably so measure described oxygen and emit ability RSC, carry out by move the pretreatment of catalyst converter described in described internal-combustion engine with lean fuel mixture, and carry out subsequently the operation with rich fuel mixture.Integration by rich gas stream when moving described internal-combustion engine with rich mixture can obtain RSC until be placed on the jump (poor to rich) of the second air inflow prober of described catalyst converter.
According to a preferred implementing form of method of the present invention, with self known natural frequency of described catalyst converter regulate implement described characteristic curve deviation have if desired a coupling to be performed.Particularly by European patent EP 1336728B1, become known for implementing the applicable method that natural frequency regulates.Preferably the natural frequency adjusting for described catalyst converter alternately moves described internal-combustion engine with rich and lean fuel mixture.During retrievable jumps of difference of the second prober arranging in the downstream of catalyst converter, this jump is caused by the switching between poor and rich fuel mixture, is transformed into the method for operation of distinguishing other.The oxygen input (OSC) that forms the measurement of catalyst converter is emitted the poor of (RSC) with the oxygen of measuring.This difference is as integral function and as for moving the input variable of regulating loop of catalyst converter.By this natural frequency, regulate and can carry out by very favorable mode the offset correction of the first air inflow prober.Therefore this natural frequency adjusting can with completely special advantage and according to Combination of Methods of the present invention, wherein characteristic curve offset error be detectable.By this combination, caused diagnosis and the matching process of the very quick and robust that the deviation of the air inflow prober arranging for the upstream at catalyst converter is diagnosed.
Likely, described natural frequency is adjusted under a kind of running state and can after in short-term, is moved to end or is not activated, and it is measurable in described running state, in tolerance that can be predetermined, there is no characteristic curve deviation according to diagnostic procedure of the present invention.This can be favourable in the whole catalysis system of---giving this catalyst converter at the upstream and downstream air inflow prober of attaching troops to a unit---because particularly there is an only catalyst converter according to catalyst converter to be arranged on repeatedly switching between rich and poor operation may not be waste gas neutrality.Therefore can advantageously, the in the situation that of there is no detectable error in a system, not be enabled in the switching between poor and richness or after in short-term, finish this switching or only needing the correction that in situation, enforcement is offset.If oxygen input does not have or indistinctively with oxygen output bias, can turn-off at once so natural frequency and regulate.Can be intended for especially the error boundary of characteristic curve offset error or error and infer threshold value, for example 1% or for example 2%.If be located on the border that this can be predetermined according to the detectable offset error of the present invention, carry out so the coupling of characteristic curve deviation, particularly according to described natural frequency, regulate.On the other hand, according to method of the present invention, be applicable in an advantageous manner the meticulous coupling of characteristic curve deviation.In free from error system, coupling fluctuates very rapidly and can be in this coupling of result afterwards that fluctuates.Therefore particularly preferably be, always start meticulous coupling.
In another preferred form of implementation, the coupling of characteristic curve deviation, the form particularly regulating with described natural frequency also can be carried out under other running statees, are particularly eliminating error storage and/or are interrupting (power supply trouble) afterwards at power voltage supply.
According to method of the present invention, in special mode, be applicable to the air inflow detector assembly according to so-called double detector scheme, wherein at the upstream and downstream of the first catalyst converter volume, be respectively equipped with a prober and catalyst converter volume that can be monitored in abutting connection with another in the second prober downstream.For example can be at this by the step type prober in the broadband air inflow prober in catalyst converter upstream and catalyst converter downstream or by another step type combinations of detectors in the step type prober of catalyst converter upstream and catalyst converter downstream.In this second design proposal, generally need stable air inflow to regulate.At this, by the first step type prober, by characteristic curve, derive λ signal, it is illustrated in the exhaust gas constituents on the first prober continuously.Naturally for this reason need to be about the different characteristic expensive coupling of temperature etc., to obtain the convictive λ signal of tool.Yet the λ signal of therefore being derived by step type detector signal can be for continuous adjusting.In addition, according to being also applicable to, according to the detector assembly of so-called 3 detector scheme, to be wherein provided with another prober in the downstream of the second catalyst converter volume on Method And Principle of the present invention.
The present invention finally comprises a kind of computer program, carries out the institute of described method in steps on arithmetic unit or control gear when carrying out; Also comprise a kind of computer program, it comprises program-code, and described program-code is stored on machine-readable carrier and for implementing described method.By be embodied as the advantage that computer program has according to method of the present invention, be, this program also can easily be applied on the Motor Vehicle of existence, so as can to utilize for the air inflow prober of the upstream of the catalyst converter through regulating according to the advantage of diagnostic method of the present invention.
Other feature and advantage of the present invention result from each embodiment's following description by reference to the accompanying drawings.In this each feature, can distinguish individually or realize in combination with one another.
Accompanying drawing explanation
Accompanying drawing is illustrated in the schematic diagram from air inflow detector assembly in the waste gas system of the internal-combustion engine of prior art, so that explanation is according to method of the present invention.
Embodiment
View specification illustrated in the accompanying drawings according to self the known sensor device in engine exhaust gas system of 2 detector scheme.Such sensor device is applicable to implement according to method of the present invention, and the air inflow prober wherein arranging in the upstream of catalyst converter in particularly advantageous mode is possible about diagnosis and the coupling of its characteristic curve deviation.
Waste gas at internal-combustion engine 10 is in 11, to be provided with the first catalyst converter volume 12 and the second catalyst converter volume 13, and they are provided for reduces the toxic emission comprising in waste gas.The burning that is mixed for of fuel and air is provided to internal-combustion engine 10.The air quantity providing is provided by air-quantity measuring device 14.Survey data is transferred to electric control device 15.This control gear 15 thus and if desired calculates fuel metering signal by the other operation characteristic variable of combustion process, by this fuel metering SC sigmal control fuel metering mechanism 16, one or more injection valves for example, they are arranged in the pumping tube 17 of internal-combustion engine 10.Mixture forms and can as in this view, in pumping tube 17 or alternatively, directly in the firing chamber of internal-combustion engine 10, realize.Waste gas from combustion process is directed to catalyst converter volume 12 and 13 by flue gas leading 11.The air inflow prober (exhaust gas probe) 18 arranging in the upstream of the first catalyst converter volume 12 obtains the oxygen concentration in the waste gas of combustion process.Another air inflow prober 19 is arranged on the downstream of the first catalyst converter volume 12.At this, relate to step type prober.The air inflow prober 18 arranging in the upstream of catalyst converter 12 is preferably broadband air inflow prober.Yet exhaust gas probe 18 can be also step type prober.Two exhaust gas probes 18 and 19 signal offer electric control device 15 and affect fuel metering by adjustment process.The first regulating loop is formed by the adjusting section with internal-combustion engine 10, exhaust gas probe 18, electric control device 15He fuel metering mechanism 16.The lack of fuel being recorded by exhaust gas probe 18 causes the change of injection pulse width large by the corresponding processing of the adjusting algorithm with in electric control device 15, by this injection pulse width, controls fuel metering mechanism 16.Give this regulating loop another regulating loop that superposes, the signal of the step type prober 19 that the downstream of this another regulating loop based at catalyst converter 12 arranges.Except thering is such system of two (or a plurality of) catalyst converter volumes and two probers, according to method of the present invention, for example also can be used in addition having the device of a catalyst converter volume only or according to the device of 3 detector scheme.
The present invention allows diagnosis and the coupling in the possible characteristic curve offset error of the air inflow prober 18 of the upstream of the first catalyst converter 12 setting in very favorable mode.The oxygen storage capacity OSC that obtains on the one hand catalyst converter 12 for the diagnosis of the characteristic curve offset error if possible existing obtains on the other hand the oxygen of catalyst converter 12 and emits ability.Because OSC and RSC relate to the identical physical descriptor of catalyst converter, it is only measured by different modes, so can infer the characteristic curve deviation at air inflow prober 18 by the difference between two measurable values.This deviation can be calculated and can be correspondingly corrected subsequently.
In order to measure the oxygen storage capacity OSC of catalyst converter 12, first with rich fuel mix, implement the pretreatment of catalyst converter, that is to say with excess of fuel operation of combustion engine.With poor fuel mixed running internal-combustion engine and to catalyst converter, fill oxygen subsequently.The step type prober 19 in catalyst converter 12 downstreams subsequently generates corresponding signal.By the integration of Oxygen Flow until prober 19 from richness, jump to and poorly can derive oxygen storage capacity OSC.
In order to measure oxygen, emit ability RSC, first with poor fuel, mix the pretreatment of implementing catalyst converter, that is to say with excessive oxygen operation of combustion engine.Subsequently with rich fuel mix operation of combustion engine and to catalyst converter releasing oxygen.The step type prober 19 in catalyst converter 12 downstreams subsequently generates corresponding signal.By the integration of rich gas flow until prober 19 from the poor richness that jumps to, can derive oxygen and emit ability RSC.
By the difference if possible existing, can be calculated the deviation of air inflow prober 18 between OSC and RSC.For example can be by OSC and RSC according to following formula estimated performance curve deviation delta
lSU:
This realizes under following prerequisite:
OSC
real=F×RSC
real
Based on catalyst temperature, catalyst converter is aging and the dynamic measurement tolerance of prober is emitted ability to the oxygen storage capacity of catalyst converter 12 and oxygen big or small produces a tolerance range while acting on the characteristic curve deviation of calculating air inflow prober 18.Therefore can find reliably the relatively large error in characteristic curve deviation by the method.Yet the method is providing great advantage aspect diagnosis speed.
The correction subsequently of characteristic curve offset error or coupling can realize by conventional method.The meticulous coupling for example with traditional integral part monitoring is possible.Such coupling is naturally slower.Have special advantage ground, the natural frequency of therefore implementing catalyst converter 12 regulates the coupling for offset error.
A part for the characteristic curve deviation of air inflow prober 18 can be used for proofreading and correct by RSC/OSC balanced adjustment and by matching value.Advantageously, described natural frequency regulates the coupling for the characteristic curve deviation of air inflow prober 18.This coupling regulating by natural frequency can finish after RSC/OSC balance, so this natural frequency regulates the task of having realized meticulous coupling.But natural frequency regulates also can be independent of the task of coupling completely that the characteristic curve deviation of air inflow prober 18 was implemented and realized subsequently to RSC/OSC balance.
For the natural frequency of preferably implementing regulates, alternately with rich fuel mix and poor fuel mixed running internal-combustion engine 10.In the corresponding jump causing of the air inflow prober 19 in catalyst converter 12 downstreams correspondingly rich and poor between switching.Oxygen is also alternately filled and empty to catalyst converter 12.The difference that the input of oxygen in catalyst converter 12 and oxygen are emitted richness and poor between transfer period between form.By this difference of integral function, use the input variable of the regulating loop that acts on catalyst converter 12.In the situation that the input of the characteristic curve offset error oxygen of air inflow prober 18 is emitted mutually different from oxygen.By integral function, realize variation thus, thus coupling fluctuation to a certain extent.Therefore the deviation of air inflow prober 18 is always less and mated or proofread and correct thus.The other details that natural frequency regulates can particularly be learnt by European patent document EP1336728B1.Can be completely widely with reference to the document.
Generally speaking, directly by rich/poor input, calculated the characteristic curve deviation if possible existing of air inflow prober 18.After only switching on a small quantity, can determine the accurate characteristic curve deviation of air inflow prober 18.According to this process of size of the storage capacity of air inflow adjusting, catalyst converter and exhaust mass stream, continue several seconds to a few minutes.The deviation of this reservation can particularly be regulated and adjust at short notice by means of natural frequency by described mode.
The method than conventional coupling more fast and more accurate.First observe by conventional methods the adjusting deviation under error condition and carry out subsequently the adjusting intervention in the adjusting of catalyst converter.Although the accurate correction of error is possible conventionally thus, the endurance is very long.According to method of the present invention, in contrast allow to proofread and correct fast.
According to method of the present invention, by the diagnosis that relatively realizes offset error of emitting at the input of catalyst converter oxygen and oxygen.Obtain that oxygen input (OSC) and oxygen are emitted (RSC) in any case measuring phases existence conventionally, because this measured value is also for other diagnosis, for example, for broadband air inflow prober dynamic diagnosis, catalyst converter diagnosis or step type prober dynamic diagnosis.In this for not implementing additional measurement according to method of the present invention.In any case the additional analysing and processing of the survey data of only obtaining is necessary.According to the present invention, can be equilibrated at and under error condition, derive rapidly error and infer and for example intervene rapidly natural frequency and regulate by RSC/OSC, so that Rapid matching deviation.
In having the scheme of a catalyst converter only, waste gas is not implemented in the repeatedly switching between poor and richness neutrally conventionally, thereby in this case advantageously, only in needs situation, by natural frequency, regulate and implement coupling, while only that is to say particularly the relevant deviation of waste gas at air inflow prober, this deviation is detectable according to the present invention.For whether existing the analysis of the deviation that waste gas is relevant can be scheduled to a definite value, particularly error supposition threshold value, before starting, another coupling must surpass this error supposition threshold value.
According to method of the present invention, allow the identification very fast of characteristic curve offset error and effective correction of error.If the last adjusting of error needs certain time interval, so very rapidly by this error counteracting and correspondingly show, thereby the advantage generally speaking providing with respect to conventional method according to method of the present invention is mainly aspect the time saving when diagnosis.Special advantage according to method of the present invention is in addition, for example the little offset error of 2-3%---its not trigger error infer---can for example, than regulate (the differential part that after, catalyst converter regulates) coupling more quickly with conventional catalyst converter.
If there is event, eliminate error storage or interrupt voltage power supply, can equally advantageously implement according to method of the present invention for diagnosing and mate the characteristic curve deviation of air inflow prober 18.In this case meaningfully, by natural frequency, regulate the activation that starts fast speed deviation coupling.Can mate very rapidly and proofread and correct the characteristic curve deviation that may exist at the air inflow prober of catalyst converter upstream in this way.Rich and poor between switch in natural frequency adjustment process in there is the system of muonic catalysis device volume in waste gas neutral be enforceable.And exhaust gases is relatively little in the situation that of a catalyst converter capacity only.As required rich and poor between switching can after in short-term, finish, for example, after the fluctuation of mating.
Claims (11)
1. the method for operation of combustion engine (10) waste gas system air inflow detector assembly, described air inflow detector assembly has at least one at the first air inflow prober (18) of catalyst converter (12) upstream and at least one the second air inflow prober (19) in catalyst converter (12) downstream, described the second air inflow prober is step type prober, wherein carry out the diagnosis of characteristic curve deviation of described the first air inflow prober (18) and the coupling of carrying out if desired characteristic curve offset error, it is characterized in that, in order to diagnose, when the air inflow activating regulates, to obtain a value of the oxygen storage capacity OSC that represents described catalyst converter (12) and represent that the oxygen of described catalyst converter (12) emits another value of ability RSC, and by the ratio of OSC and RSC, calculated the characteristic curve deviation of described the first air inflow prober (18).
2. method according to claim 1, it is characterized in that, measure described oxygen storage capacity OSC, its method is to carry out the pretreatment of the described catalyst converter (12) when moving described internal-combustion engine (10) with rich fuel mixture, carries out subsequently with the operation of lean fuel mixture and carries out the integration of Oxygen Flow until be placed on the poor passage of the second air inflow prober (19) of described catalyst converter (12).
3. method according to claim 1 and 2, it is characterized in that, measure described oxygen and emit ability RSC, its method is to carry out the pretreatment of the described catalyst converter (12) when moving described internal-combustion engine (10) with lean fuel mixture, carries out subsequently with the operation of rich fuel mixture and carries out the integration of rich gas stream until be placed on the Futong road of the second air inflow prober (19) of described catalyst converter (12).
4. according to the method one of the claims Suo Shu, its particularly in, with the natural frequency of described catalyst converter (12), regulate the coupling that realizes described characteristic curve deviation.
5. method according to claim 4, it is characterized in that, natural frequency adjusting for described catalyst converter (12) alternately moves described internal-combustion engine (10) with rich and lean fuel mixture, wherein in the redirect causing accordingly of described the second air inflow prober (19), between poor and rich fuel mixture, switch, and the oxygen that formation is measured is inputted the difference of emitting with the oxygen of measuring and is used as integral function as the input variable of the regulating loop for described catalyst converter (12).
6. according to the method described in claim 4 or 5, it is characterized in that, described natural frequency is adjusted in and under a kind of running state, is not activated or is moved to end after in short-term, and it is measurable in described running state, there is no characteristic curve deviation in tolerance that can be predetermined.
7. according to the method one of the claims Suo Shu, it is characterized in that, since the size that can be scheduled to of described characteristic curve deviation particularly surpass 1% preferably 2% big or small time carry out the coupling of described characteristic curve deviation, particularly according to the natural frequency of claim 4, regulate.
8. according to the method one of the claims Suo Shu, it is characterized in that, at elimination error storage and/or after power voltage supply interrupts, implement the coupling of described characteristic curve deviation, particularly according to the natural frequency of claim 4, regulate.
9. according to the method one of the claims Suo Shu, it is characterized in that, described method is for according to the air inflow detector assembly of 2 detector scheme, particularly has in conjunction with the broadband air inflow prober (17) of step type prober (18) or has the step type prober regulating in conjunction with other step type prober and stable air inflow.
10. a computer program is carried out according to the institute of the method for one of claim 1 to 9 in steps when in arithmetic unit or the upper execution of control gear (15).
11. 1 kinds of computer programs, it comprises program-code, and described program-code is stored on machine-readable carrier, when described program is carried out on arithmetic unit or control gear (15), implements according to the method one of claim 1 to 9 Suo Shu.
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| DE201310201734 DE102013201734A1 (en) | 2013-02-04 | 2013-02-04 | Method for operating oxygen sensor arrangement in exhaust gas system of internal combustion engine, involves detecting values for diagnosis of active oxygen adjustment, where former value represents oxygen storage capacity of catalyst |
| DE102013201734.0 | 2013-02-04 |
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| CN103967567B (en) | 2018-03-30 |
| DE102013201734A1 (en) | 2014-08-07 |
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