CN102102565A - Method and device for on-board error diagnosis in operation of internal combustion engine of motor vehicle - Google Patents

Method and device for on-board error diagnosis in operation of internal combustion engine of motor vehicle Download PDF

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Publication number
CN102102565A
CN102102565A CN2010105860260A CN201010586026A CN102102565A CN 102102565 A CN102102565 A CN 102102565A CN 2010105860260 A CN2010105860260 A CN 2010105860260A CN 201010586026 A CN201010586026 A CN 201010586026A CN 102102565 A CN102102565 A CN 102102565A
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value
reference value
discharging
current
explosive motor
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CN102102565B (en
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Y·雅各布
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Ford Global Technologies LLC
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Ford Global Technologies LLC
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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
    • F02D41/146—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 NOx content or concentration
    • 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
    • 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
    • F02D41/146—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 NOx content or concentration
    • F02D41/1461—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 NOx content or concentration of the exhaust gases emitted by the engine
    • 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
    • F02D41/146—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 NOx content or concentration
    • F02D41/1461—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 NOx content or concentration of the exhaust gases emitted by the engine
    • F02D41/1462—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 NOx content or concentration of the exhaust gases emitted by the engine with determination means using an estimation
    • 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
    • F02D41/1466—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being a soot concentration or content
    • F02D41/1467—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being a soot concentration or content with determination means using an estimation
    • 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
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M15/00—Testing of engines
    • G01M15/04—Testing internal-combustion engines
    • G01M15/10—Testing internal-combustion engines by monitoring exhaust gases or combustion flame
    • G01M15/102—Testing internal-combustion engines by monitoring exhaust gases or combustion flame by monitoring exhaust gases
    • 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
    • F01N2560/026—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
    • 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
    • F01N2900/04—Methods of control or diagnosing
    • F01N2900/0416—Methods of control or diagnosing using the state of a sensor, e.g. of an exhaust gas sensor
    • 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
    • F01N2900/0601—Parameters used for exhaust control or diagnosing being estimated
    • 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
    • F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
    • 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
    • F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
    • F01N2900/1402—Exhaust gas composition
    • 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
    • F01N2900/1606—Particle filter loading or soot amount
    • 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
    • F02D41/0002—Controlling intake air
    • 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 present invention relates to a method and a device for on-board error diagnosis in operation of an internal combustion engine of a motor vehicle. The method for on-board error diagnosis comprises the following steps: determining an exhaust reference value based on a theory of air path and fuel path; determining a current exhaust value under a current working condition; determining an index value which corresponds with an integration of the current exhaust value in a preset time interval and a quotient of the exhaust reference value at the time interval; and generating a failure signal based on the index value.

Description

In the explosive motor operation process, carry out the method and apparatus of " on the car " fault diagnosis
Technical field
The present invention relates in the explosive motor operation process, carry out the method and apparatus of " on the car " fault diagnosis.
Background technique
Rise since diesel particulate filter is applied to motor vehicle, the analysis of explosive motor carbon smoke exhaust is undertaken by the estimation that the soot of diesel particulate filter is loaded more and more.To causing the estimation of the unusual condition of diesel particulate filter overburdening in the explosive motor, be mainly used in the prediction of diesel particulate filter event of overload, and when the controlled regeneration of safety is no longer feasible, be used to avoid change owing to carbon soot particles blocks the diesel particulate filter that causes.Another adverse effect that particulate filter load increases is that back pressure raises above nominal value, and the fuel economy of explosive motor and performance all can be affected thus.
Therefore there is such demand, promptly obtains fault in the explosive motor running the information of the influence of explosive motor carbon smoke exhaust.
In addition, " on the car " of NOx discharging measured and opened a series of new feasible methods in the internal combustion engine exhaust gas system, is used for controlling and fault diagnosis in the explosive motor operation process.Though the current sensor that is to use carries out fault diagnosis, also there is feasible method about air path and fuel path recirculation adjusting.
A problem has just appearred this moment, promptly in " on the car " fault diagnosis framework, because with regard to the test run from same starting point to same destination is driven, different NOx discharged and different fuel consumptions when first driver can drive with another driver according to its driving habits generation, so the restriction for the NOx critical value is insignificant, for example, more there is the driving style of pathbreaker's spirit can produce higher NOx discharging and more fuel consumption.In contrast, drive the cycle for regular test run, NOx discharging and fuel consumption do not rely on driving style, and this is because of the definition according to test period, the acceptable variation between this dependence is confined between different test periods.
Till current, under the prior art situation, with regard to the NOx discharging, the application of " on the car " identification is not carried out deep research at the control of explosive motor operation both not at " on the car " fault diagnosis yet.
Summary of the invention
The objective of the invention is to, a kind of method and device that carries out " on the car " fault diagnosis in the explosive motor operation process is provided, they are at carbon smoke exhaust and/or NO xThe discharging aspect has realized " on the car " fault diagnosis reliably, and realizes suitable control in case of necessity.
This purpose is achieved by the method according to this invention, and device according to the present invention is achieved.
The method of carrying out " on the car " fault diagnosis in the explosive motor operation process may further comprise the steps:
Based on the theory setting of air path and fuel path, determine the discharging reference value;
Determine the current discharge value under the current working;
Determine index value, wherein this index value is corresponding to the current discharge value merchant of the integration at interval and the integration of discharging reference value on this time lag at the fixed time; And
Generate trouble signal based on this index value.
The present invention is especially based on the discharging reference value is calculated this theory, carbon smoke exhaust or NO that this discharging reference value can be an explosive motor xThe discharging reference value of discharging, this represents the theoretical value of emission level to a certain extent, wherein discharges reference value and is used for " car " fault diagnosis, also is used for emission control in case of necessity.
According to the present invention, the function that is provided with as the theory of air path and fuel path, (unit is mg/m to the reference value of carbon smoke exhaust 3) calculate, so just can be with respect to the influence of dynamics of vehicle (being instantaneous correction) to the steady state calibration value.
According to an embodiment, based on the reference value (F of the fraction in the exhaust Exh, ref) definite discharging reference value.In addition, also can be based on the value (F of fraction in the exhaust Exh, ref) determine the current discharge value under the current working.
For given operating mode, the soot concentration that produces in combustion process depends primarily on the fraction (F in the exhaust Exh).For the reference value of carbon smoke exhaust,, be used for the theory setting of air path and fuel path with calculating the reference value of fraction in the exhaust.Owing to be imbued with offensiveness or have the driving style of pathbreaker's spirit can cause more significant theoretical value correction (promptly because the high-pass filtering meeting of instantaneous correction causes bigger deviation), and cause bigger deviation (relating in particular to air path) between theoretical setting and the measured numerical value, therefore tackle driving behavior in this case and take in.
According to an embodiment, trouble signal is depended in the emission control of explosive motor.
According to another embodiment, trouble signal is depended in the correction of the theory setting of air path and/or fuel path.
According to an embodiment, first codomain at trouble signal is revised the theory setting of air path, and at second codomain of trouble signal the theory setting of fuel path is revised, wherein second codomain meets the more large deviation of current discharging with respect to the discharging reference value than first codomain.
According to a further aspect in the invention, carry out the method for " on the car " fault diagnosis in the explosive motor operation process, it is characterized in that, described method comprises that the theory based on air path and fuel path is provided with definite discharging reference value; Determine the current discharge value under the current working; Determine index value, wherein this index value is corresponding to described current the discharge value integration at interval and the merchant of the integration of described discharging reference value on this time lag at the fixed time; And based on described index value generation trouble signal, wherein control the theory setting of coordinating need to determine whether correction air path and/or fuel path based on air and fuel path, when having bigger carbon smoke exhaust deviation, theory setting to fuel path is revised, when having the deviation of less relatively carbon smoke exhaust, the theory setting of air path is revised.
In addition, the invention still further relates to a kind of device that carries out " on the car " fault diagnosis in the explosive motor operation process, this device is designed to implement according to the described method of aforesaid right requirement.The preferred embodiment of this equipment is with reference to the foregoing description relevant with this method.
Other embodiments' of the present invention more details are referring to specification and each dependent claims.
Description of drawings
Hereinafter according to the preferred embodiment the present invention is carried out more detailed explanation with reference to the accompanying drawings.
Fig. 1 illustrates according to an embodiment using the schematic representation of carrying out the method that is used for fault diagnosis under the carbon smoke exhaust situation;
Fig. 2 is the schematic representation that illustrates the method that is used for controlling carbon smoke exhaust according to the present invention;
Fig. 3 illustrates according to an embodiment using the schematic representation of carrying out the method that is used for fault diagnosis under the NOx emission behaviour;
Fig. 4 is the schematic representation that illustrates the method that is used for controlling the NOx discharging according to the present invention.
Embodiment
At first see figures.1.and.2 below, it shows according to the present invention a kind of of method who carries out fault diagnosis or control explosive motor under the situation of using carbon smoke exhaust may mode of execution.
According to Fig. 1, the function that is provided with as the theory of air path and/or fuel path basically, (unit is mg/m to carbon smoke exhaust 3) reference value calculate.
Shown in signal among Fig. 1, for given operating mode, the soot concentration that produces in combustion process depends primarily on the fraction (F in the exhaust Exh).Correspondingly, in order to determine the reference value of carbon smoke exhaust, need to calculate the reference value (F of fraction in the exhaust Exh, ref), to be used for the theory setting of air path and fuel path.
Theory at fuel path is provided with under the situation of non-dynamic change, mainly based on the reference value (F of fraction in the exhaust Exh, ref) calculate the reference value of carbon smoke exhaust, and the reference value of fraction does not mainly get by not calculating based on the MAF under the air path control situation of model and MAP reference value in the exhaust.Explosive motor discharging in being provided with at the theory of air path and fuel path is afterwards estimated the reference value of carbon smoke exhaust.
For the purpose of " on the car " fault diagnosis, according to Fig. 1, the current carbon smoke exhaust that calculates is carried out integration at interval at the fixed time, and divided by the reference value of this carbon smoke exhaust integration at interval at the fixed time.The selection in the used here time lag is crucial for the time range of the pre-calibration mass fraction that is used for next service cycle in the diesel particulate filter, to guarantee accurate fault diagnosis.
The index value that calculates thus will compare (the critical index value of OBD with the critical index value of the OBD that is used for fault diagnosis, OBD=" diagnoses on the car "), wherein the critical index value of this OBD is corresponding to the merchant of OBD critical value (unit is for restraining per service cycle) with the integration of carbon smoke exhaust reference value (unit is for restraining per service cycle).Exceed the situation of the critical index value of OBD for numerical value, will show fault message and export trouble signal by fault diagnosis.
According to Fig. 2, the deviation between the reference value of soot mark and the currency of carbon smoke exhaust is used to generate trouble signal.This trouble signal will be used in air and fuel path structure by hereinafter described:
The control of air and fuel path coordinates need to determine whether the theory setting of correction air path and/or fuel path, so that the deviation between the calculated value of the reference value of carbon smoke exhaust and carbon smoke exhaust is placed within the acceptable tolerance range.
According to the operating range of explosive motor, the theory setting of fuel path is revised at bigger carbon smoke exhaust deviation (that is, under the fast dynamic situation of needs).Under the less relatively situation of the deviation of carbon smoke exhaust, and follow under the good situation between current theoretical setting of reference value and air path, the theory setting of air path is revised.
Alternatively, in closed circuit (" closed loop ") feedback control of air path, can directly use the soot trouble signal, with the adjusting of control air path.When operation occurred on another operation point of NOx soot fair curve, the feasibility of using this method to control was restricted owing to being associated with the NOx discharge value, and the tolerance range of this NOx discharge value is come given by the OBD critical value of NOx discharging.
In view of the above, if " on the car " of carbon smoke exhaust control and/or monitoring are expectation or necessary, the model of exhaust aftertreatment parts also can be included in interior to be used to estimate carbon smoke exhaust arbitrarily, these parts can influence the soot content of (and on monitoring position) in the outlet pipe, any diesel particulate filter catalyst element for example, its can be stored in the carbon soot particles on the suction port on the inlet of diesel particulate filter and be transformed.Similarly, can use the model of current carbon smoke exhaust, be used for carbon smoke exhaust being assessed, yet be the algorithm for estimating of measuring and/or being fit to according to direct " on the car " in this case at monitoring position.This can be corresponding to and algorithm for estimating that be employed relevant with the reference value of carbon smoke exhaust, yet need be applied for the basis and to it with the current measured value (MAF, MAP, exhaust Lambda value, air inlet Lambda value) of air path and fuel path herein.
The discharging reference value that also can be used for the NOx discharging with reference to the said method of shown in Figure 1 being used for " car " fault diagnosis similarly.Below, at first illustrate according to the present invention that with reference to Fig. 3 and Fig. 4 a kind of of method who carries out fault diagnosis and control explosive motor under the situation of using the NOx discharging may mode of execution.
At this, calculate the reference value of NOx discharging based on following steps: estimate the discharging of unburned NOx, utilize the thermodynamic model on the simplification rank of exhaust aftertreatment parts, and the NOx discharging of estimating the downstream.
According to shown in Figure 3, at given operating mode, according to the fraction (F in the exhaust Exh) determine the NOx concentration that in combustion process, produces.Correspondingly, need calculate the reference value (F of fraction in the exhaust at the theory setting of air and fuel path Exh, ref), thereby the reference value of definite NOx concentration.
Explosive motor discharging in being provided with at the theory of air path and fuel path is afterwards estimated the reference value of carbon smoke exhaust.Theory at fuel path is provided with under the situation of non-dynamic change, mainly based on the reference value (F of fraction in the exhaust Exh, ref) calculate the reference value of NOx concentration, and the reference value of fraction does not mainly get by not calculating based on the MAF under the air path control situation of model and MAP reference value in the exhaust.Explosive motor discharging in being provided with at the theory of air path and fuel path is afterwards estimated the reference value of NOx concentration.
For the purpose of " on the car " fault diagnosis, according to Fig. 3, the current NOx that calculates is emitted on carries out integration on the predetermined time interval, and divided by the reference value of this NOx discharging integration at interval at the fixed time.The selection in the used here time lag is crucial for the time range of the pre-calibration mass fraction that is used for next service cycle in the diesel particulate filter, to guarantee accurate fault diagnosis.
Exceed the situation of the critical index value of OBD for numerical value, will show fault message and export trouble signal by fault diagnosis.The index value that calculates thus will compare (the critical index value of OBD with the critical index value of the OBD that is used for fault diagnosis, OBD=" diagnoses on the car "), wherein the critical index value of this OBD is corresponding to the merchant of OBD critical value (unit is for restraining per service cycle) with the integration of NOx discharging reference value (unit is per service cycle of gram).Exceed the situation of the critical index value of OBD for numerical value, will show fault message and export trouble signal by fault diagnosis.
According to Fig. 4, the deviation between the currency of the reference value of NOx discharging and NOx discharging is used to generate trouble signal.This trouble signal will be used in air and fuel path mechanism by hereinafter described:
The control of air and fuel path coordinates need to determine whether the theory setting of correction air path and/or fuel path, so that the deviation between the calculated value that the reference value of NOx discharging and NOx are discharged places within the acceptable tolerance range.
According to the operating range of explosive motor, the theory setting of fuel path is revised at bigger NOx discharging deviation (that is, under the fast dynamic situation of needs).Under the less relatively situation of the deviation of NOx discharging, and follow under the good situation between current theoretical setting of reference value and air path, the theory setting of air path is revised.
Alternatively, in closed circuit (" closed loop ") feedback control of air path, can directly use the NOx trouble signal, with the setting of control air path.
In view of the above, if " on the car " control of NOx discharging and/or monitoring are expectation or necessary, the model of exhaust aftertreatment parts also can be included in interior to be used to estimate the NOx discharging arbitrarily, these parts can influence the NOx discharging of (and on monitoring position) in the outlet pipe, for example any diesel particulate filter catalyst element, its can discharge the NOx on the suction port on the inlet that be stored in diesel particulate filter and be transformed.Similarly, can use the model of current NOx discharging, be used at the monitoring position model that discharging is assessed to NOx, yet be the algorithm for estimating of measuring and/or being fit to according to direct " on the car " in this case.This can be corresponding to and algorithm for estimating that be employed relevant with the reference value of NOx discharging, yet need be basic herein with the current measured value (MAF, MAP, exhaust Lambda value, air inlet Lambda value) of air path and fuel path and it is applied.

Claims (10)

1. carry out the method for " on the car " fault diagnosis in the explosive motor operation process, it is characterized in that, described method comprises:
Theory based on air path and fuel path is provided with definite discharging reference value;
Determine the current discharge value under the current working;
Determine index value, wherein this index value is corresponding to described current the discharge value integration at interval and the merchant of the integration of described discharging reference value on this time lag at the fixed time; And
Generate trouble signal based on described index value.
2. the method for claim 1 is characterized in that, described discharging reference value is the reference value of the carbon smoke exhaust of described explosive motor.
3. the method for claim 1 is characterized in that, described discharging reference value is the NO of described explosive motor xThe reference value of discharging.
4. the method according to any one of the preceding claims is characterized in that, determines that described discharging reference value is based on the reference value (F of the fraction in the exhaust Exh, ref) carry out.
5. the method according to any one of the preceding claims is characterized in that, determines that described current discharge value is based on the value (F of the fraction in the exhaust under the current working Exh, ref) carry out.
6. the method according to any one of the preceding claims is characterized in that, described trouble signal is depended in the emission control of described explosive motor.
7. the method according to any one of the preceding claims is characterized in that, described trouble signal is depended in the described theoretical correction that is provided with of described air path and/or fuel path.
8. method as claimed in claim 7, it is characterized in that, first codomain at described trouble signal is revised described theoretical setting of described air path, and at second codomain of described trouble signal described theoretical setting of described fuel path revised, wherein said second codomain meets the more large deviation of current discharging with respect to the discharging reference value than described first codomain.
9. be used for the device of explosive motor running " car " fault diagnosis, it is characterized in that this device is designed to implement the method according to any one of the preceding claims.
10. carry out the method for " on the car " fault diagnosis in the explosive motor operation process, it is characterized in that, described method comprises:
Theory based on air path and fuel path is provided with definite discharging reference value;
Determine the current discharge value under the current working;
Determine index value, wherein this index value is corresponding to described current the discharge value integration at interval and the merchant of the integration of described discharging reference value on this time lag at the fixed time; And
Generate trouble signal based on described index value, wherein control the theory setting of coordinating need to determine whether correction air path and/or fuel path based on air and fuel path, when having bigger carbon smoke exhaust deviation, theory setting to fuel path is revised, when having the deviation of less relatively carbon smoke exhaust, the theory setting of air path is revised.
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