WO2009133281A1 - System and method for diagnosing the operational condition of an exhaust gas inlet device for automobile internal combustion engine - Google Patents

System and method for diagnosing the operational condition of an exhaust gas inlet device for automobile internal combustion engine Download PDF

Info

Publication number
WO2009133281A1
WO2009133281A1 PCT/FR2009/000385 FR2009000385W WO2009133281A1 WO 2009133281 A1 WO2009133281 A1 WO 2009133281A1 FR 2009000385 W FR2009000385 W FR 2009000385W WO 2009133281 A1 WO2009133281 A1 WO 2009133281A1
Authority
WO
WIPO (PCT)
Prior art keywords
recirculation
mass
valve
particles
control unit
Prior art date
Application number
PCT/FR2009/000385
Other languages
French (fr)
Inventor
Charlotte Lynch
Original Assignee
Renault S.A.S
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Renault S.A.S filed Critical Renault S.A.S
Priority to EP09738315A priority Critical patent/EP2262997A1/en
Publication of WO2009133281A1 publication Critical patent/WO2009133281A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D21/00—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas
    • F02D21/06—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air
    • F02D21/08—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine
    • 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
    • F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
    • F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
    • F02D11/10—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type
    • F02D11/107—Safety-related aspects
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D23/00—Controlling engines characterised by their being supercharged
    • 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
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/0047—Controlling exhaust gas recirculation [EGR]
    • F02D41/005—Controlling exhaust gas recirculation [EGR] according to engine operating conditions
    • 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
    • F02D41/1445—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 related to the exhaust flow
    • 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
    • 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
    • F02D41/221—Safety or indicating devices for abnormal conditions relating to the failure of actuators or electrically driven elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
    • F02B29/04—Cooling of air intake supply
    • F02B29/0406—Layout of the intake air cooling or coolant circuit
    • 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
    • F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
    • 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
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/0047—Controlling exhaust gas recirculation [EGR]
    • F02D41/0065—Specific aspects of external EGR control
    • F02D41/0072—Estimating, calculating or determining the EGR rate, amount or flow
    • 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
    • F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
    • F02D41/029—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a particulate filter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
    • F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
    • F02M26/06—Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream of the compressor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23—Layout, e.g. schematics
    • F02M26/25—Layout, e.g. schematics with coolers having bypasses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/45—Sensors specially adapted for EGR systems
    • F02M26/46—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition
    • F02M26/47—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition the characteristics being temperatures, pressures or flow rates
    • 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
    • Y02T10/12—Improving ICE efficiencies
    • 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

Definitions

  • the present invention generally relates to the operation of an internal combustion engine of a motor vehicle.
  • the invention relates to a system for diagnosing the operation of an internal combustion engine 10 for recirculating a part of the exhaust gases from the combustion.
  • One of these strategies is to recirculate some of the exhaust gases from combustion using a
  • EGR exhaust gas recirculation
  • Another strategy making it possible to reduce the emission of polluting particles consists in implanting a particulate filter in the exhaust line making it possible to retain the particles carried by the exhaust gases. As and when using the engine, the particles accumulate in the filter and eventually result in significant back-pressure to the engine exhaust, which significantly reduces its performance. This can also cause a breakage of a turbocharger of the engine, even the beginning of fire.
  • the filter In order to restore the performance of the engine, the filter is regenerated by combustion of the particles that have accumulated therein.
  • This combustion operation is made possible by an increase in the internal temperature of the particulate filter.
  • it is generally carried out a delayed injection of fuel into the combustion chambers of the engine or a fuel injection in the exhaust line upstream of a catalytic device.
  • the fuel thus injected does not burn in the combustion chambers of the engine, but, for example, in the catalytic device also provided in the exhaust line which creates an exotherm, thereby increasing the temperature of the gases then passing through the particulate filter.
  • the regeneration of the particulate filter can be done periodically during regeneration phases as soon as the quantity of particles in the filter becomes too great.
  • a particulate filter therefore operates periodically, in two phases. During a first phase, it stores particles emitted by the engine, and during a second phase, the stored particles are burned in order to regenerate the filter. There are different systems for determining the amount of particles present in the filter so as to know when a regeneration has to be controlled.
  • systems use the differential pressure at the terminals of the particulate filter and the internal volume flow rate.
  • this method is relatively unreliable insofar as the particles emitted by diesel engines are composed in part of non-combustible particles. These fractions, called residues, come mainly from the engine lubrication oil burned during its operation. These residues clog the pores of the particulate filter and thus participate in the pressure difference across the filter. Under these conditions, part of the mass of soot determined by such systems is in fact non-combustible.
  • a particle level measurement sensor in the exhaust line downstream of said filter.
  • the system of this document makes it possible to obtain a good determination of the quantity of particles present in the particulate filter in order to monitor its efficiency and to avoid a large counterpressure to the exhaust, which considerably reduces the engine performance.
  • this system does not control the operation of the low pressure recirculation line and the associated valve.
  • soot particles may not be trapped inside it and be readmitted to the intake of the engine through the recirculation line.
  • the present invention aims to remedy these disadvantages.
  • the present invention aims to enable monitoring of the operating state of the means provided for the admission of engine gas.
  • the present invention proposes a system for diagnosing the operating state of a gas intake device for an internal combustion engine of a motor vehicle, the device comprising an intake pipe for fresh air and a pipe exhaust gas recirculation system provided with at least one recirculation valve.
  • the recirculation line is connected to the intake pipe and to the exhaust line equipped with a particulate filter.
  • the system comprises means for determining the mass of particles present in the exhaust line downstream of the particulate filter and upstream of the recirculation line, and a control unit capable of controlling the valve of recirculation from the determined mass of particles and the percentage of opening of said valve.
  • the determination means comprise a sensor for measuring the amount of particles present in the exhaust gases mounted between the particulate filter and the recirculation line, and a means for detecting the volume flow rate of the gases of exhaust at said filter.
  • control unit comprises means for determining the mass of particles present at a heat exchanger mounted on the recirculation pipe for cooling the recycled exhaust gas.
  • the control unit may also include means for comparing said mass with a threshold value for detecting malfunction of the heat exchanger.
  • the recirculation line comprises a first recirculation valve mounted between the exhaust line and the heat exchanger, and a second recirculation valve mounted between said heat exchanger and the fresh air intake duct.
  • the control unit may be able to control the second recirculation valve from the determined mass of particles and the opening percentages of the first and second recirculation valves.
  • control unit comprises means for determining the mass of particles present at a compressor of the device.
  • the control unit may include means for comparing the mass of particles present at the compressor with a threshold value for detecting the malfunction of said compressor.
  • the device comprises a gas inlet pipe provided with an intake valve.
  • the control unit may be able to control the intake valve from among others the determined mass of particles and the opening percentages of the valve or recirculation valves and said intake valve.
  • the control unit preferably comprises means for determining the mass of particles present in the gas intake duct.
  • the control unit may also include means for comparing the mass of particles present in the gas intake pipe with a threshold value for detecting the malfunction of said intake pipe.
  • the invention also relates to a method for diagnosing the operating state of a gas intake device for a motor vehicle internal combustion engine, the device comprising an intake duct for fresh air and a recirculation duct for a motor vehicle. exhaust gas provided with at least one recirculation valve, said recirculation line being connected to the intake pipe and to an exhaust line equipped with a particulate filter.
  • the mass of particles present in the exhaust line downstream of the particulate filter and upstream of the recirculation line is determined, and the recirculation valve is piloted from the determined mass of particles and the percentage opening said valve.
  • FIG. 1 schematically represents an internal combustion engine equipped with a diagnostic system according to the present invention
  • FIG. 2 schematically illustrates the different operating steps of the system of FIG. 1.
  • FIG. 1 schematically shows the general structure of an internal combustion engine 10 for a motor vehicle, which here comprises four cylinders 12 in line.
  • the engine 10 comprises an intake manifold 14 for supplying gas to the cylinders 12 and an exhaust manifold 16 in communication with said cylinders, which is itself connected to an exhaust line 18.
  • the exhaust line 18 comprises a turbine 20 mounted on a shaft 22 common to a compressor 24 disposed in a pipe intake port 26 connected to the manifold 14.
  • the exhaust gas conveyed inside the connecting line 18 passes through the turbine 20 which drives the compressor 24 so as to increase the pressure of the air admitted into the cylinders 12
  • the engine 10 also comprises an intake duct 28 for fresh air which is connected to the duct 26, upstream of the compressor 24.
  • the intake duct 28 with fresh air is provided with an air filter 30.
  • the engine 10 further comprises means for the partial injection or recirculation of the exhaust gas at the intake (EGR).
  • EGR exhaust gas at the intake
  • a recirculation pipe 32 is stitched on the exhaust line 18 downstream of the turbine 20 and connected to the inlet pipe 26.
  • a first recirculation valve 34 is disposed between the exhaust line 18 and the recirculation conduit 32 to control the amount of exhaust gas passed through said conduit.
  • the recirculation valve 34 is a three-way valve.
  • a second recirculation valve 36 is also provided on the recirculation line 32, downstream of the first recirculation valve 34, for controlling the amount of exhaust gas which is then re-injected into the inlet pipe 26 for feeding. intake manifold 14. This is called low pressure reinjection.
  • the recirculation line 32 also comprises a heat exchanger 38 through which the recycled exhaust gas and a heat-transfer fluid pass through so as to obtain a cooling of the exhaust gases before they are introduced inside the intake duct.
  • the coolant passing through the heat exchanger 38 is the one used for the engine cooling.
  • the heat exchanger 38 is located between the recirculation valves 34, 36.
  • the engine 10 comprises a recirculation line 40 stitched on the exhaust manifold 16 and opening at the intake duct 26 immediately upstream of the collector. 14.
  • the recirculation line 40 comprises a recirculation valve 42 so as to control the amount of exhaust gas reinjected inside the intake pipe 26.
  • On the recirculation line 40 is tapped a bypass pipe 44 provided with a heat exchanger 46 traversed by the heat transfer fluid passing through the heat exchanger 38 and by the recirculated exhaust gas.
  • a bypass valve 48 is associated with the pipe 44 so as to allow or not the cooling of the recirculated exhaust gas.
  • the engine 10 is further provided with a heat exchanger 50 mounted on the intake duct 26 between the compressor 24 and the intake manifold 14, and an intake valve 27 mounted on said duct downstream of the engine. heat exchanger 50 to control the amount of mixture consisting of recirculated exhaust gas and fresh air directed to the intake manifold 14.
  • the heat exchanger 50 is traversed by the heat transfer fluid passing through the heat exchangers 38 46 and the gas mixture conveyed in the pipe 26.
  • the heat exchanger 50 allows the inlet gases to be cooled before they enter the intake manifold 14.
  • the heat exchanger 50 is constituted by the charge air cooler of the engine.
  • a catalyst 52 of oxidation and a particulate filter 54 forming a catalytic particle filter In the exhaust line 18 are mounted from upstream to downstream a catalyst 52 of oxidation and a particulate filter 54 forming a catalytic particle filter.
  • the oxidation catalyst 52 is mounted directly downstream of the turbine 20 and the particulate filter 54 upstream of the tapping of the recirculation pipe 32.
  • An electronic control unit 60 ensures the operation of the motor 10 and receives for this purpose a certain amount of information.
  • Pressure and temperature sensors are for example mounted on the pipes 26, 28 and 32, in the collector intake 14, and on the exhaust line 18 between the turbine 20 and the catalyst 52 oxidation.
  • a sensor 62 for measuring the level of particles present in the exhaust gas placed immediately. downstream of the particulate filter 54 and upstream of the recirculation valve 34. More specifically, the sensor 62 continuously delivers information relating to the volume concentration of particles in the exhaust gas. Of course, alternatively, it is possible to provide another type of sensor to measure the amount of particles present downstream of the particulate filter 54.
  • the sensor 62 is connected to the central unit 60 via a connection 64.
  • a flow meter 66 upstream of the particulate filter 54 and downstream of the catalyst 52 oxidation to calculate the volume flow rate of gas upstream of said filter.
  • the flowmeter 66 is connected to the control unit 60 via a connection 68.
  • an estimation device which would include a mathematical model of the operation of the filter.
  • particle 54 which would be able to determine the volume flow upstream of the particulate filter according to data on the parameters entering the control unit 60. These data can for example include the fresh air supply flow of the engine, the flow rate of recycled gases within lines 32 and 40, and engine operating data 10.
  • the control unit 60 may in particular control the position of the recirculation valves 34 and 36, the discharge valve 27, the recirculation valve 42 and the bypass valve 48, respectively by connections 70 to 78.
  • the control unit 60 includes, stored in memory, all the material and logistical means for performing a diagnosis of the operating state of the particulate filter 54 and the engine gas intake means in particular from the measurements made. by the sensor 62, by calculating from these measurements, the masses of particles present in different parts of the engine in order to detect possible malfunctions.
  • step 80 the values measured by the sensor 62 of the particle concentration in the exhaust gas are acquired. Then, during the following step 82, the mass M of particles present between the particulate filter 54 and the tapping of the recirculation pipe 32 is calculated. To do this, the following relationship is used:
  • C sensor represents the particle volume concentration in g / m 3 measured by the sensor 62
  • Q vo i represents the volume flow rate of the exhaust gases in m 3 / s measured by the sensor 66.
  • the mass of particles present directly downstream of the particulate filter 54 is thus integrated by time integration.
  • M represents the mass of particles in grams calculated during the previous step 82, V the vehicle speed in km / h, and
  • T the time considered in hours.
  • the mass obtained is compared with a threshold value S for detecting the malfunction of the particulate filter 54.
  • the threshold value S is set by the anti-pollution standards in force. As an indication, the threshold value S may be equal to 10 mg / km.
  • the mass Mi of particles at the inlet of the heat exchanger 38 is determined during a step 90 in order to evaluate its level of fouling.
  • This mass Mi of particles is calculated from the measurements made by the sensor 60 and from the opening percentage of the recirculation valve 34. From the concentration of particles in the exhaust gas present directly downstream of the filter. 54 and the position of the recirculation valve 34, the mass flow rate of particles at the level of the heat exchanger 38 is initially determined. By integrating this mass flow rate as a function of the time considered, the mass E is obtained. particles at said exchanger.
  • the value of the mass Mi is compared with a threshold value S i for detecting the malfunction of the heat exchanger 38. If it is detected during this step 92, the mass E of particles is greater than or equal to the threshold value it S i, it is considered, in the following step 94, that the heat exchanger 38 has reached a limit level of fouling and that the recirculation valve 34 must be closed . The process then resumes from step 80.
  • the threshold value Si may be equal to 50 mg.
  • the mass of particles M 2 at the compressor 24 is calculated during step 96.
  • the mass M 2 of particles is determined from the measurements of the sensor 60 and the opening percentages of the recirculation valves 34 and 36.
  • step 98 This is followed by a comparison test of this mass M 2 with a threshold S 2 of compressor malfunction detection, in the next step 98. If it is detected during this step that the mass M 2 is greater than this detection threshold S 2 , it is considered, in the following step 100, that the compressor 24 has reached a limit level of fouling and that the recirculation valve 36 must be closed to avoid any risk of breakage . The process then resumes from step 80.
  • the threshold value S 2 may be equal to 10 mg.
  • this mass M 3 of particles is calculated from the measurements of the sensor 60 and the opening percentages of the recirculation valves 34, 36 and the inlet valve 27.
  • a test is made by comparing the mass of particles M 3 with a threshold S 3 for detecting malfunction of the intake duct 26, during step 104. If it is detected, during this step, that the mass M 3 of particles is greater than or equal to this threshold, it is considered in the following step 106 that the inlet pipe 26 has reached a critical level of fouling and that the inlet valve 27 must be closed. On the other hand, if the value of the mass M 3 of particles is lower than this threshold S 3 for detecting a malfunction, the method then resumes from step 80.
  • the threshold value S 3 may be equal to 25 mg.
  • this closure is carried out progressively in order to descend below the thresholds S i, S 2 or S 3 of malfunction detection considered. , by successive iterations.
  • the invention from the information of the sensor 60 located downstream of the particulate filter, it is possible to perform a diagnosis of the level of fouling of the heat exchanger 38, the compressor 24 and the intake duct 26. and, more generally, means provided for the gas inlet of the cylinders of the internal combustion engine. This provides a more reliable engine.
  • this diagnosis can be performed independently of the monitoring of the operating state of the particulate filter.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Processes For Solid Components From Exhaust (AREA)

Abstract

The invention relates to an operational-condition diagnosing system for the gas inlet device of an automobile internal combustion engine that comprises a fresh air inlet duct (28) and an exhaust gas recirculation duct (32) provided with at least one recirculation valve (34, 36), said recirculation duct being connected to an inlet duct and to an exhaust duct provided with a particle filter (54). The system includes means (62, 66) for determining the mass of the particles present in the exhaust line downstream from the particle filter and upstream from the recirculation duct (32), and a control unit (60) adapted for driving the recirculation valve on the basis of the determined particle mass and of the opening percentage of said valve.

Description

SYSTEME ET PROCEDE DE DIAGNOSTIC DE L1ETAT DE FONCTIONNEMENT D'UN DISPOSITIF D'ADMISSION EN GAZ D'ECHAPPEMENT POUR MOTEUR A COMBUSTIONSYSTEM AND METHOD FOR DIAGNOSIS OF STATE 1 OPERATING DEVICE FOR ADMISSION TO EXHAUST GASES COMBUSTION ENGINE
INTERNE DE VEHICULE AUTOMOBILEINTERNAL OF MOTOR VEHICLE
5 La présente invention concerne de manière générale le fonctionnement d'un moteur à combustion interne de véhicule automobile.The present invention generally relates to the operation of an internal combustion engine of a motor vehicle.
Plus particulièrement, l'invention concerne un système de diagnostic du fonctionnement d'un moteur à combustion interne 10 permettant une recirculation d'une partie des gaz d'échappement issus de la combustion.More particularly, the invention relates to a system for diagnosing the operation of an internal combustion engine 10 for recirculating a part of the exhaust gases from the combustion.
On cherche à l'heure actuelle à diminuer au maximum les émissions polluantes des moteurs à combustion interne de véhicules automobiles, qu'ils soient du type à allumage commandé ou du type 15 Diesel. Les restrictions d'émission de polluants à l'échappement des moteurs nécessitent le développement de stratégies de dépollution de plus en plus efficaces.At the present time, it is sought to minimize the pollutant emissions of internal combustion engines of motor vehicles, whether of the spark ignition type or of the Diesel type. Pollutant emission restrictions on engines require the development of more and more effective abatement strategies.
L'une de ces stratégies consiste à faire recirculer une partie des gaz d'échappement issus de la combustion au moyen d'une conduite deOne of these strategies is to recirculate some of the exhaust gases from combustion using a
20 recirculation partielle des gaz d'échappement (EGR) qui est piquée sur la ligne d'échappement du moteur. On parle alors de recirculation basse pression.20 partial exhaust gas recirculation (EGR) which is stitched on the exhaust line of the engine. This is called low pressure recirculation.
Une telle réintroduction des gaz d'échappement à l'admission du moteur permet en effet de diminuer la température de combustion à 25 l' intérieur des cylindres et donc de réduire l'émission de particules d'oxyde d'azote NOx particulièrement nocives.Such a reintroduction of the exhaust gas at the engine inlet makes it possible to reduce the combustion temperature inside the cylinders and thus to reduce the emission of particularly harmful NO x oxide particles.
Une autre stratégie permettant la diminution de l'émission de particules polluantes consiste à implanter un filtre à particules dans la ligne d'échappement permettant de retenir les particules véhiculées par 0 les gaz d'échappement. Au fur et à mesure de l'utilisation du moteur, les particules s'accumulent dans le filtre et finissent par entraîner une contre-pression importante à l'échappement du moteur, ce qui diminue considérablement ses performances. Cela peut également engendrer une casse d' un turbocompresseur du moteur, voire des débuts d' incendie.Another strategy making it possible to reduce the emission of polluting particles consists in implanting a particulate filter in the exhaust line making it possible to retain the particles carried by the exhaust gases. As and when using the engine, the particles accumulate in the filter and eventually result in significant back-pressure to the engine exhaust, which significantly reduces its performance. This can also cause a breakage of a turbocharger of the engine, even the beginning of fire.
Afin de rétablir les performances du moteur, on pratique une régénération du filtre par combustion des particules qui s'y sont accumulées. Cette opération de combustion est rendue possible par une élévation de la température interne du filtre à particules. Pour ce faire, on procède généralement à une injection retardée de carburant dans les chambres de combustion du moteur ou une injection de carburant dans la ligne d'échappement en amont d' un dispositif catalytique. Le carburant ainsi injecté ne brûle pas dans les chambres de combustion du moteur, mais, par exemple, dans le dispositif catalytique également prévu dans la ligne d'échappement qui crée un exotherme, augmentant ainsi la température des gaz traversant ensuite le filtre à particules.In order to restore the performance of the engine, the filter is regenerated by combustion of the particles that have accumulated therein. This combustion operation is made possible by an increase in the internal temperature of the particulate filter. To do this, it is generally carried out a delayed injection of fuel into the combustion chambers of the engine or a fuel injection in the exhaust line upstream of a catalytic device. The fuel thus injected does not burn in the combustion chambers of the engine, but, for example, in the catalytic device also provided in the exhaust line which creates an exotherm, thereby increasing the temperature of the gases then passing through the particulate filter.
La régénération du filtre à particules peut être faite périodiquement au cours de phases de régénération dès que la quantité de particules dans le filtre devient trop importante. Un filtre à particules fonctionne donc de manière périodique, en deux phases. Lors d' une première phase, il stocke des particules émises par le moteur, et lors d'une seconde phase, les particules stockées sont brûlées afin de régénérer le filtre. II existe différents systèmes de détermination de la quantité de particules présentes dans le filtre de manière à savoir lorsqu' une régénération doit être commandée.The regeneration of the particulate filter can be done periodically during regeneration phases as soon as the quantity of particles in the filter becomes too great. A particulate filter therefore operates periodically, in two phases. During a first phase, it stores particles emitted by the engine, and during a second phase, the stored particles are burned in order to regenerate the filter. There are different systems for determining the amount of particles present in the filter so as to know when a regeneration has to be controlled.
Des systèmes utilisent à cet égard la pression différentiel le aux bornes du filtre à particules et le débit volumique interne. Toutefois, cette méthode est relativement peu fiable dans la mesure où les particules émises par les moteurs Diesel sont composées en partie de particules non combustibles. Ces fractions, appelées résidus, proviennent en majeure partie de l'huile de lubrification du moteur brûlée lors de son fonctionnement. Ces résidus colmatent les pores du filtre à particules et participent donc à la différence de pression aux bornes du filtre. Dans ces conditions, une partie de la masse de suies déterminée par de tels systèmes est en fait non combustible. Afin de déterminer la quantité de particules présentes dans le filtre à particules, il est également possible de monter un capteur de mesure du taux de particules dans la ligne d'échappement en aval dudit filtre. Pour plus de détail, on pourra par exemple se référer au système décrit dans le document JP 2005-325812. Le système de ce document permet d'obtenir une bonne détermination de la quantité de particules présentes dans le filtre à particules afin de surveiller son efficacité et d'éviter une contre- pression importante à l'échappement réduisant considérablement les performances du moteur. Toutefois^ ce système ne permet pas de contrôler le fonctionnement de la conduite de recirculation basse pression et de la vanne associée. Or, dans certaines conditions de fonctionnement du filtre, des particules de suies peuvent ne pas être piégées à l'intérieur de celui-ci et être réadmises à l'admission du moteur par la conduite de recirculation.In this respect, systems use the differential pressure at the terminals of the particulate filter and the internal volume flow rate. However, this method is relatively unreliable insofar as the particles emitted by diesel engines are composed in part of non-combustible particles. These fractions, called residues, come mainly from the engine lubrication oil burned during its operation. These residues clog the pores of the particulate filter and thus participate in the pressure difference across the filter. Under these conditions, part of the mass of soot determined by such systems is in fact non-combustible. In order to determine the amount of particles present in the particulate filter, it is also possible to mount a particle level measurement sensor in the exhaust line downstream of said filter. For more detail, it may for example refer to the system described in JP 2005-325812. The system of this document makes it possible to obtain a good determination of the quantity of particles present in the particulate filter in order to monitor its efficiency and to avoid a large counterpressure to the exhaust, which considerably reduces the engine performance. However, this system does not control the operation of the low pressure recirculation line and the associated valve. However, in certain operating conditions of the filter, soot particles may not be trapped inside it and be readmitted to the intake of the engine through the recirculation line.
Selon la quantité de particules de suies recirculées, il peut se produire un encrassement de la vanne de recirculation, voire du turbocompresseur et du collecteur d'admission, réduisant les performances du moteur et augmentant la consommation en carburant. La présente invention vise à remédier à ces inconvénients. D'une manière générale, la présente invention vise à permettre une surveillance de l'état de fonctionnement des moyens prévus pour l'admission en gaz du moteur. A cet effet, la présente invention propose un système de diagnostic de l'état de fonctionnement d' un dispositif d'admission en gaz pour moteur à combustion interne de véhicule automobile, le dispositif comprenant une conduite d'admission en air frais et une conduite de recirculation de gaz d'échappement pourvue d'au moins une vanne de recirculation. La conduite de recirculation est reliée à la conduite d'admission et à la ligne d'échappement équipée d'un filtre à particules.Depending on the amount of soot particles recirculated, clogging of the recirculation valve, or turbocharger and intake manifold can occur, reducing engine performance and increasing fuel consumption. The present invention aims to remedy these disadvantages. In general, the present invention aims to enable monitoring of the operating state of the means provided for the admission of engine gas. For this purpose, the present invention proposes a system for diagnosing the operating state of a gas intake device for an internal combustion engine of a motor vehicle, the device comprising an intake pipe for fresh air and a pipe exhaust gas recirculation system provided with at least one recirculation valve. The recirculation line is connected to the intake pipe and to the exhaust line equipped with a particulate filter.
Selon une caractéristique générale, le système comprend des moyens de détermination de la masse de particules présentes dans la ligne d'échappement en aval du filtre à particules et en amont de la conduite de recirculation, et une unité de contrôle apte à piloter la vanne de recirculation à partir de la masse de particules déterminée et du pourcentage d'ouverture de la dite vanne.According to a general characteristic, the system comprises means for determining the mass of particles present in the exhaust line downstream of the particulate filter and upstream of the recirculation line, and a control unit capable of controlling the valve of recirculation from the determined mass of particles and the percentage of opening of said valve.
Dans un mode de réalisation, les moyens de détermination comportent un capteur de mesure du taux de particules présentes dans les gaz d'échappement monté entre le filtre à particules et la conduite de recirculation, et un moyen de détection du débit volumique des gaz d'échappement au niveau dudit filtre.In one embodiment, the determination means comprise a sensor for measuring the amount of particles present in the exhaust gases mounted between the particulate filter and the recirculation line, and a means for detecting the volume flow rate of the gases of exhaust at said filter.
Avantageusement, l'unité de contrôle comprend des moyens de détermination de la masse de particules présentes au niveau d'un échangeur de chaleur monté sur la conduite de recirculation pour refroidir les gaz d'échappement recyclés. L' unité de contrôle peut également comprendre un moyen de comparaison de ladite masse avec une valeur seuil de détection de dysfonctionnement de l'échangeur de chaleur.Advantageously, the control unit comprises means for determining the mass of particles present at a heat exchanger mounted on the recirculation pipe for cooling the recycled exhaust gas. The control unit may also include means for comparing said mass with a threshold value for detecting malfunction of the heat exchanger.
De préférence, la conduite de recirculation comprend une première vanne de recirculation montée entre la ligne d'échappement et l'échangeur de chaleur, et une seconde vanne de recirculation montée entre ledit échangeur de chaleur et la conduite d'admission en air frais.Preferably, the recirculation line comprises a first recirculation valve mounted between the exhaust line and the heat exchanger, and a second recirculation valve mounted between said heat exchanger and the fresh air intake duct.
L'unité de contrôle peut être apte à piloter la seconde vanne de recirculation à partir de la masse de particules déterminée et des pourcentages d'ouverture des première et seconde vannes de recirculation.The control unit may be able to control the second recirculation valve from the determined mass of particles and the opening percentages of the first and second recirculation valves.
Dans un mode de réalisation, l'unité de contrôle comprend des moyens de détermination de la masse de particules présentes au niveau d'un compresseur du dispositif. L'unité de contrôle peut comprendre un moyen de comparaison de la masse de particules présentes au niveau du compresseur avec une valeur seuil de détection de dysfonctionnement dudit compresseur.In one embodiment, the control unit comprises means for determining the mass of particles present at a compressor of the device. The control unit may include means for comparing the mass of particles present at the compressor with a threshold value for detecting the malfunction of said compressor.
Dans un mode de réalisation, le dispositif comporte une conduite d'admission en gaz pourvue d'une vanne d'admission. L'unité de contrôle peut être apte à piloter la vanne d'admission à partir en autres de la masse de particules déterminée et des pourcentages d'ouverture de la vanne ou des vannes de recirculation et de ladite vanne d'admission. L'unité de contrôle comprend de préférence des moyens de détermination de la masse de particules présentes dans la conduite d'admission en gaz. L'unité de contrôle peut également comprendre un moyen de comparaison de la masse de particules présentes dans la conduite d'admission en gaz avec une valeur seuil de détection de dysfonctionnement de ladite conduite d'admission. L' invention concerne également un procédé de diagnostic de l'état de fonctionnement d' un dispositif d'admission en gaz pour moteur à combustion interne de véhicule automobile, le dispositif comportant une conduite d'admission en air frais et une conduite de recirculation de gaz d'échappement pourvue d'au moins une vanne de recirculation, ladite conduite de recirculation étant reliée à la conduite d'admission et à une ligne d'échappement équipée d'un filtre à particules.In one embodiment, the device comprises a gas inlet pipe provided with an intake valve. The control unit may be able to control the intake valve from among others the determined mass of particles and the opening percentages of the valve or recirculation valves and said intake valve. The control unit preferably comprises means for determining the mass of particles present in the gas intake duct. The control unit may also include means for comparing the mass of particles present in the gas intake pipe with a threshold value for detecting the malfunction of said intake pipe. The invention also relates to a method for diagnosing the operating state of a gas intake device for a motor vehicle internal combustion engine, the device comprising an intake duct for fresh air and a recirculation duct for a motor vehicle. exhaust gas provided with at least one recirculation valve, said recirculation line being connected to the intake pipe and to an exhaust line equipped with a particulate filter.
Selon le procédé, on détermine la masse de particules présentes dans la ligne d'échappement en aval du filtre à particules et en amont de la conduite de recirculation, et on pilote la vanne de recirculation à partir de la masse de particules déterminée et du pourcentage d'ouverture de ladite vanne.According to the method, the mass of particles present in the exhaust line downstream of the particulate filter and upstream of the recirculation line is determined, and the recirculation valve is piloted from the determined mass of particles and the percentage opening said valve.
La présente invention sera mieux comprise à l'étude d'un mode de réalisation pris à titre d'exemple nullement limitatif et il lustré par les dessins annexés, sur lesquels :The present invention will be better understood from the study of an embodiment taken by way of nonlimiting example and glossed by the accompanying drawings, in which:
- la figure 1 représente schématiquement un moteur à combustion interne équipé d' un système de diagnostic selon la présente invention, et - la figure 2 illustre schématiquement les différentes étapes de fonctionnement du système de la figure 1.FIG. 1 schematically represents an internal combustion engine equipped with a diagnostic system according to the present invention, and FIG. 2 schematically illustrates the different operating steps of the system of FIG. 1.
Sur la figure 1 , on a représenté de manière schématique la structure générale d'un moteur 10 à combustion interne pour véhicule automobile qui comporte ici quatre cylindres 12 en ligne. Le moteur 10 comprend un collecteur d'admission 14 pour alimenter en gaz les cylindres 12 et un collecteur d'échappement 16 en communication avec lesdits cylindres, qui est lui-même relié à une ligne d'échappement 18.FIG. 1 schematically shows the general structure of an internal combustion engine 10 for a motor vehicle, which here comprises four cylinders 12 in line. The engine 10 comprises an intake manifold 14 for supplying gas to the cylinders 12 and an exhaust manifold 16 in communication with said cylinders, which is itself connected to an exhaust line 18.
La ligne d'échappement 18 comporte une turbine 20 montée sur un arbre 22 commun à un compresseur 24 disposé dans une conduite d'admission 26 reliée au collecteur 14. Les gaz d'échappement véhiculés à l'intérieur de la ligne d'ëcnappement 18 traversent la turbine 20 qui entraîne le compresseur 24 de façon à augmenter la pression de l'air admis dans les cylindres 12. Le moteur 10 comporte également une conduite d'admission 28 en air frais qui se raccorde sur la conduite 26, en amont du compresseur 24. La conduite d'admission 28 en air frais est pourvue d'un filtre à air 30.The exhaust line 18 comprises a turbine 20 mounted on a shaft 22 common to a compressor 24 disposed in a pipe intake port 26 connected to the manifold 14. The exhaust gas conveyed inside the connecting line 18 passes through the turbine 20 which drives the compressor 24 so as to increase the pressure of the air admitted into the cylinders 12 The engine 10 also comprises an intake duct 28 for fresh air which is connected to the duct 26, upstream of the compressor 24. The intake duct 28 with fresh air is provided with an air filter 30.
Le moteur 10 comprend encore des moyens pour la réinjection ou recirculation partielle des gaz d'échappement à l'admission (EGR). A cet effet, une conduite de recirculation 32 est piquée sur la ligne d'échappement 18 en aval de la turbine 20 et reliée à la conduite 26 d'admission. Une première vanne de recirculation 34 est disposée entre la ligne d'échappement 18 et la conduite de recircuiation 32 pour commander la quantité de gaz d'échappement traversés dans ladite conduite. La vanne de recirculation 34 est une vanne trois voies. Une seconde vanne de recirculation 36 est également prévue sur la conduite de recirculation 32, en aval de la première vanne de recirculation 34, pour commander la quantité de gaz d'échappement qui sont réinjectés ensuite dans la conduite d'admission 26 en vue de l'alimentation du . collecteur d'admission 14. On parle alors de réinjection basse pression.The engine 10 further comprises means for the partial injection or recirculation of the exhaust gas at the intake (EGR). For this purpose, a recirculation pipe 32 is stitched on the exhaust line 18 downstream of the turbine 20 and connected to the inlet pipe 26. A first recirculation valve 34 is disposed between the exhaust line 18 and the recirculation conduit 32 to control the amount of exhaust gas passed through said conduit. The recirculation valve 34 is a three-way valve. A second recirculation valve 36 is also provided on the recirculation line 32, downstream of the first recirculation valve 34, for controlling the amount of exhaust gas which is then re-injected into the inlet pipe 26 for feeding. intake manifold 14. This is called low pressure reinjection.
La conduite de recirculation 32 comporte également un échangeur de chaleur 38 traversé par les gaz d'échappement recyclés et par un fluide caloporteur de manière à obtenir un refroidissement des gaz d'échappement avant leur introduction à l'intérieur de la conduite d'admission 26. Avantageusement, le fluide caloporteur traversant l'échangeur de chaleur 38 est celui utilisé pour le refroidissement du moteur. L'échangeur de chaleur 38 est situé entre les vannes de reciré'ulation 34, 36.The recirculation line 32 also comprises a heat exchanger 38 through which the recycled exhaust gas and a heat-transfer fluid pass through so as to obtain a cooling of the exhaust gases before they are introduced inside the intake duct. Advantageously, the coolant passing through the heat exchanger 38 is the one used for the engine cooling. The heat exchanger 38 is located between the recirculation valves 34, 36.
De manière à réaliser également une réinjection haute pression des gaz d'échappement, le moteur 10 comprend une conduite de recirculation 40 piquée sur le collecteur d'échappement 16 et débouchant au niveau de la conduite d'admission 26 immédiatement en amont du collecteur d'admission 14. La conduite de recirculation 40 comporte une vanne de recirculation 42 de manière à commander la quantité de gaz d'échappement réinjectés à l' intérieur de la conduite d'admission 26. Sur la conduite de recirculation 40 est piquée une conduite de dérivation 44 pourvue d' un échangeur de chaleur 46 traversé par le fluide caloporteur traversant l ' échangeur de chaleur 38 et par les gaz d'échappement recirculés. Une vanne de dérivation 48 est associée à la conduite 44 de manière à permettre ou non le refroidissement des gaz d'échappement recirculés.In order to also perform a high-pressure reinjection of the exhaust gas, the engine 10 comprises a recirculation line 40 stitched on the exhaust manifold 16 and opening at the intake duct 26 immediately upstream of the collector. 14. The recirculation line 40 comprises a recirculation valve 42 so as to control the amount of exhaust gas reinjected inside the intake pipe 26. On the recirculation line 40 is tapped a bypass pipe 44 provided with a heat exchanger 46 traversed by the heat transfer fluid passing through the heat exchanger 38 and by the recirculated exhaust gas. A bypass valve 48 is associated with the pipe 44 so as to allow or not the cooling of the recirculated exhaust gas.
Le moteur 10 est pourvu encore d'un échangeur de chaleur 50 monté sur la conduite d'admission 26 entre le compresseur 24 et le collecteur d'admission 14, et d'une vanne d'admission 27 montée sur ladite conduite en aval de l'échangeur de chaleur 50 pour commander la quantité de mélange constitué de gaz d'échappement recirculés et d'air frais dirigé vers le collecteur d'admission 14. L'échangeur de chaleur 50 est traversé par le fluide caloporteur traversant les échangeurs de chaleur 38, 46 et par le mélange de gaz véhiculé dans la conduite 26. L'échangeur de chaleur 50 permet de refroidir les gaz d'admission avant leur entrée au niveau du collecteur d'admission 14.The engine 10 is further provided with a heat exchanger 50 mounted on the intake duct 26 between the compressor 24 and the intake manifold 14, and an intake valve 27 mounted on said duct downstream of the engine. heat exchanger 50 to control the amount of mixture consisting of recirculated exhaust gas and fresh air directed to the intake manifold 14. The heat exchanger 50 is traversed by the heat transfer fluid passing through the heat exchangers 38 46 and the gas mixture conveyed in the pipe 26. The heat exchanger 50 allows the inlet gases to be cooled before they enter the intake manifold 14.
L'échangeur de chaleur 50 est constitué par le refroidisseur d'air de suralimentation du moteur.The heat exchanger 50 is constituted by the charge air cooler of the engine.
Dans la ligne d'échappement 18 sont montés d'amont en aval un catalyseur 52 d'oxydation et un filtre à particules 54 formant un filtre à particules catalytique. Le catalyseur 52 d'oxydation est monté directement en aval de la turbine 20 et le filtre à particules 54 en amont du piquage de la conduite de recirculation 32.In the exhaust line 18 are mounted from upstream to downstream a catalyst 52 of oxidation and a particulate filter 54 forming a catalytic particle filter. The oxidation catalyst 52 is mounted directly downstream of the turbine 20 and the particulate filter 54 upstream of the tapping of the recirculation pipe 32.
Une unité de contrôle 60 électronique assure le fonctionnement du moteur 10 et reçoit à cet effet un certain nombre d'informations.An electronic control unit 60 ensures the operation of the motor 10 and receives for this purpose a certain amount of information.
Différents capteurs (non représentés) sont placés à cet égard dans les conduites et leurs signaux sont amenés sur l'unité de contrôle 60. Des capteurs de pression et de température sont par exemple montés sur les conduites 26, 28 et 32, dans le collecteur d'admission 14, et sur la ligne d'échappement 18 entre la turbine 20 et le catalyseur 52 d'oxydation.Different sensors (not shown) are placed in this respect in the pipes and their signals are fed to the control unit 60. Pressure and temperature sensors are for example mounted on the pipes 26, 28 and 32, in the collector intake 14, and on the exhaust line 18 between the turbine 20 and the catalyst 52 oxidation.
Pour le contrôle de fonctionnement du filtre à particules 54 et le diagnostic de l'état des moyens permettant l'admission en gaz du moteur 10, il est prévu un capteur 62 de mesure du taux de particules présentes dans les gaz d'échappement placé immédiatement en aval du filtre à particules 54 et en amont de la vanne de recirculation 34. Plus précisément, le capteur 62 délivre en continu une information relative à la concentration volumique en particules .dans les gaz d'échappement. Bien entendu, en variante, il est possible de prévoir un autre type de capteur pour mesurer Ia quantité de particules présentes en aval du filtre à particules 54. Le capteur 62 est raccordé à l'unité centrale 60 par l'intermédiaire d'une connexion 64.For the control of the operation of the particulate filter 54 and the diagnosis of the state of the means allowing the admission of gas to the engine 10, there is provided a sensor 62 for measuring the level of particles present in the exhaust gas placed immediately. downstream of the particulate filter 54 and upstream of the recirculation valve 34. More specifically, the sensor 62 continuously delivers information relating to the volume concentration of particles in the exhaust gas. Of course, alternatively, it is possible to provide another type of sensor to measure the amount of particles present downstream of the particulate filter 54. The sensor 62 is connected to the central unit 60 via a connection 64.
Dans cev but, il est également prévu un débitmètre 66 monté en amont du filtre à particules 54 et en aval du catalyseur 52 d'oxydation pour calculer le débit volumique des gaz en amont dudit filtre. Le débitmètre 66 est raccordé à l'unité de contrôle 60 par l'intermédiaire d'une connexion 68. En variante, il pourrait être envisageable de remplacer le débitmètre par un dispositif d'estimation qui comprendrait un modèle mathématique du fonctionnement du filtre à particules 54 qui serait capable de déterminer le débit volumique en amont du filtre à particules en fonction de données sur les paramètres entrant dans l'unité de contrôle 60. Ces données peuvent par exemple comprendre le débit d'alimentation en air frais du moteur, le débit des gaz recyclés à l'intérieur des conduites 32 et 40, et des données de fonctionnement du moteur 10.In this v purpose, there is also provided a flow meter 66 upstream of the particulate filter 54 and downstream of the catalyst 52 oxidation to calculate the volume flow rate of gas upstream of said filter. The flowmeter 66 is connected to the control unit 60 via a connection 68. Alternatively, it could be possible to replace the flowmeter with an estimation device which would include a mathematical model of the operation of the filter. particle 54 which would be able to determine the volume flow upstream of the particulate filter according to data on the parameters entering the control unit 60. These data can for example include the fresh air supply flow of the engine, the flow rate of recycled gases within lines 32 and 40, and engine operating data 10.
L'unité de contrôle 60 peut notamment commander la position des vannes de recirculation 34 et 36, de la vanne d'amission 27, de la vanne de recirculation 42 et de Ia vanne de dérivation 48, respectivement par des connexions 70 à 78.The control unit 60 may in particular control the position of the recirculation valves 34 and 36, the discharge valve 27, the recirculation valve 42 and the bypass valve 48, respectively by connections 70 to 78.
L'unité de contrôle 60 comprend, stockés en mémoire, tous les moyens matériels et logistiques permettant de procéder au diagnostic de l' état de fonctionnement du filtre à particules 54 et des moyens d'admission en gaz du moteur notamment à partir des mesures faites par le capteur 62, en calculant à partir de ces mesures, les masses de particules présentes dans différentes parties du moteur en vue de détecter d'éventuels dysfonctionnements.The control unit 60 includes, stored in memory, all the material and logistical means for performing a diagnosis of the operating state of the particulate filter 54 and the engine gas intake means in particular from the measurements made. by the sensor 62, by calculating from these measurements, the masses of particles present in different parts of the engine in order to detect possible malfunctions.
On va décrire, en référence à la figure 2, les principales étapes du procédé de diagnostic mis en œuvre au sein de l ' unité de contrôle 60.With reference to FIG. 2, the main steps of the diagnostic method implemented within the control unit 60 will be described.
Dans un premier temps, lors de l 'étape 80, on acquiert les valeurs mesurées par le capteur 62 de la concentration en particules au sein des gaz d' échappement. Ensuite, lors de l'étape 82 suivante, on calcule la masse M de particules présentes entre le filtre à particules 54 et le piquage de la conduite de recirculation 32. Pour ce faire, on utilise la relation suivante :In a first step, during step 80, the values measured by the sensor 62 of the particle concentration in the exhaust gas are acquired. Then, during the following step 82, the mass M of particles present between the particulate filter 54 and the tapping of the recirculation pipe 32 is calculated. To do this, the following relationship is used:
M = / [Ccapteur X Qvol] -dt dans laquelle : Ccapteur représente la concentration volumique en particules en g/m3 mesurée par le capteur 62, etM = / [Qvol X sensor] -dt in which: C sensor represents the particle volume concentration in g / m 3 measured by the sensor 62, and
Qvoi représente le débit volumique des gaz d'échappement en m3/s mesuré par le capteur 66. Lors de cette étape, on obtient donc par intégration dans le temps la masse de particules présentes directement en aval du filtre à particules 54.Q vo i represents the volume flow rate of the exhaust gases in m 3 / s measured by the sensor 66. In this step, the mass of particles present directly downstream of the particulate filter 54 is thus integrated by time integration.
Puis, lors de l'étape 84 suivante, on calcule la valeur de la masse m de particules par kilomètre en aval dudit filtre à particules. Pour ce faire, on utilise la relation suivante : m = M/(V x T) dans laquelle :Then, during the next step 84, the value of the mass m of particles per kilometer downstream of said particulate filter is calculated. To do this, we use the following relation: m = M / (V x T) in which:
M représente la masse de particules en grammes calculée lors de l'étape 82 précédente, V la vitesse du véhicule en km/h, etM represents the mass of particles in grams calculated during the previous step 82, V the vehicle speed in km / h, and
T le temps considéré en heure.T the time considered in hours.
Au cours de l'étape 86 suivante, on compare la masse m ains i obtenue avec une valeur seuil S de détection de dysfonctionnement du filtre à particules 54. La valeur seuil S est fixée par les normes anti- pollution en vigueur. A titre indicatif, la valeur seuil S peut être égale à 10 mg/km.In the following step 86, the mass obtained is compared with a threshold value S for detecting the malfunction of the particulate filter 54. The threshold value S is set by the anti-pollution standards in force. As an indication, the threshold value S may be equal to 10 mg / km.
Ainsi, s'il est détecté, lors de cette étape 86, que la masse m de particules par kilomètre en aval du filtre à particules 54 est supérieure ou égale à la valeur seuil S, il est considéré, lors de l'étape 88 suivante, que le filtre à particules 54 est endommagé. Au contraire, si ladite masse est inférieure à cette valeur de seuil S, le filtre à particules 54 peut continuer à fonctionner et le procédé reprend à partir de l'étape 80. Indépendamment des étapes 84 à 88, à partir de l'étape 82, on détermine, au cours d'une étape 90, la masse Mi de particules à l'entrée de l 'échangeur de chaleur 38 afin d'évaluer son niveau d'encrassement. On calcule cette masse Mi de particules à partir des mesures réalisées par le capteur 60 et du pourcentage d'ouverture de la vanne de recirculation 34. A partir de la concentration en particules au sein des gaz d'échappement présents directement en aval du filtre à particules 54 et de la position de la vanne de recirculation 34, on détermine dans un premier temps le débit massique de particules au niveau de l'échangeur de chaleur 38. En intégrant ce débit massique en fonction du temps considéré, on obtient la masse Mi de particules au niveau dudit échangeur.Thus, if it is detected, during this step 86, that the mass m of particles per kilometer downstream of the particulate filter 54 is greater than or equal to the threshold value S, it is considered, in the following step 88 that the particulate filter 54 is damaged. On the contrary, if said mass is lower than this threshold value S, the particle filter 54 can continue to operate and the process resumes from step 80. Independently of steps 84 to 88, from step 82, the mass Mi of particles at the inlet of the heat exchanger 38 is determined during a step 90 in order to evaluate its level of fouling. This mass Mi of particles is calculated from the measurements made by the sensor 60 and from the opening percentage of the recirculation valve 34. From the concentration of particles in the exhaust gas present directly downstream of the filter. 54 and the position of the recirculation valve 34, the mass flow rate of particles at the level of the heat exchanger 38 is initially determined. By integrating this mass flow rate as a function of the time considered, the mass E is obtained. particles at said exchanger.
Au cours de l'étape 92 suivante, on compare la valeur de la masse Mi avec une valeur seuil S i de détection de dysfonctionnement de l'échangeur de chaleur 38. S' il est détecté lors de cette étape 92, que la masse Mi de particules est supérieure ou égale à la valeur seu il S i , on considère, lors de l'étape 94 suivante, que l'échangeur de chaleur 38 a atteint un niveau d'encrassement limite et que la vanne de recirculation 34 doit être fermée. Le procédé reprend alors à partir de l'étape 80. A titre indicatif, la valeur seuil Si peut être égale à 50 mg.In the following step 92, the value of the mass Mi is compared with a threshold value S i for detecting the malfunction of the heat exchanger 38. If it is detected during this step 92, the mass E of particles is greater than or equal to the threshold value it S i, it is considered, in the following step 94, that the heat exchanger 38 has reached a limit level of fouling and that the recirculation valve 34 must be closed . The process then resumes from step 80. By way of indication, the threshold value Si may be equal to 50 mg.
Au contraire, si la valeur de la masse Mi est inférieure à cette valeur de seuil S i de détection, on calcule lors de l'étape 96, la masse de particules M2 au niveau du compresseur 24. De manière analogue au calcul de la masse Mi , la masse M2 de particules est déterminée à partir des mesures du capteur 60 et des pourcentages d'ouverture des vannes de recirculation 34 et 36.On the other hand, if the value of the mass Mi is smaller than this detection threshold value S i, the mass of particles M 2 at the compressor 24 is calculated during step 96. In a similar way to the calculation of the mass Mi, the mass M 2 of particles is determined from the measurements of the sensor 60 and the opening percentages of the recirculation valves 34 and 36.
On procède alors à un test par comparaison de cette masse M2 avec un seuil S2 de détection de dysfonctionnement du compresseur, lors de l'étape 98 suivante. S' il est détecté, lors de cette étape, que la masse M2 est supérieure à ce seuil S2 de détection, on considère, lors de rétape 100 suivante, que le compresseur 24 a atteint un niveau d'encrassement limite et que la vanne de recirculation 36 doit être fermée pour éviter tout risque de casse. Le procédé reprend alors à partir de l'étape 80. A titre indicatif, la valeur seuil S2 peut être égale à 10 mg.This is followed by a comparison test of this mass M 2 with a threshold S 2 of compressor malfunction detection, in the next step 98. If it is detected during this step that the mass M 2 is greater than this detection threshold S 2 , it is considered, in the following step 100, that the compressor 24 has reached a limit level of fouling and that the recirculation valve 36 must be closed to avoid any risk of breakage . The process then resumes from step 80. By way of indication, the threshold value S 2 may be equal to 10 mg.
Au contraire, si la masse M2 est inférieure à ce seuil S2 de détection, on calcule, lors de l'étape 102 suivante, la masse M3 de particules au niveau de la conduite d'admission 26, directement en amont du collecteur d' admission 14. De façon analogue aux calculs deOn the contrary, if the mass M 2 is below this detection threshold S 2 , the mass M 3 of particles at the level of the inlet duct 26 is calculated, in the following step 102, directly upstream of the collector 14. In a similar way to the calculations of
Mi et M2, on calcule cette masse M3 de particujes à partir des mesures du capteur 60 et des pourcentages d'ouverture des vannes de recirculation 34, 36 et de la vanne d'admission 27.Mi and M 2 , this mass M 3 of particles is calculated from the measurements of the sensor 60 and the opening percentages of the recirculation valves 34, 36 and the inlet valve 27.
On procède ensuite à un test par comparaison de la masse de particules M3 avec un seuil S3 de détection de dysfonctionnement de la conduite d'admission 26, lors de l'étape 104. S'il est détecté, lors de cette étape, que la masse M3 de particules est supérieure ou égale à ce seuil, on considère, lors de l'étape 106 suivante que la conduite d'admission 26 a atteint un niveau d'encrassement critique et que la vanne d' admission 27 doit être fermée. Au contraire, si la valeur de la masse M3 de particules est inférieure à ce seuil S3 de détection de dysfonctionnement, le procédé reprend alors à partir de l 'étape 80. A titre indicatif, la valeur seuil S3 peut être égale à 25 mg.Next, a test is made by comparing the mass of particles M 3 with a threshold S 3 for detecting malfunction of the intake duct 26, during step 104. If it is detected, during this step, that the mass M 3 of particles is greater than or equal to this threshold, it is considered in the following step 106 that the inlet pipe 26 has reached a critical level of fouling and that the inlet valve 27 must be closed. On the other hand, if the value of the mass M 3 of particles is lower than this threshold S 3 for detecting a malfunction, the method then resumes from step 80. By way of indication, the threshold value S 3 may be equal to 25 mg.
Bien entendu, lors de la commande de fermeture des vannes de recirculation 34, 36 ou d' admission 27, cette fermeture s'effectue de manière progressive afin de redescendre en dessous des seuils S i , S2 ou S3 de détection de dysfonctionnement considérés, par itérations successives. Grâce à l' invention, à partir des informations du capteur 60 situé en aval du filtre à particules, on peut effectuer un diagnostic du niveau d'encrassement de l'échangeur de chaleur 38, du compresseur 24 et de la conduite d'admission 26, et, de manière plus générale, des moyens prévus pour l'admission en gaz des cylindres du moteur à combustion interne. On dispose ainsi d' un moteur plus fiable. En outre, ce diagnostic peut être effectué indépendamment de la surveillance de l'état de fonctionnement du filtre à particules. Of course, during the closing command of the recirculation valves 34, 36 or admission 27, this closure is carried out progressively in order to descend below the thresholds S i, S 2 or S 3 of malfunction detection considered. , by successive iterations. Thanks to the invention, from the information of the sensor 60 located downstream of the particulate filter, it is possible to perform a diagnosis of the level of fouling of the heat exchanger 38, the compressor 24 and the intake duct 26. and, more generally, means provided for the gas inlet of the cylinders of the internal combustion engine. This provides a more reliable engine. In addition, this diagnosis can be performed independently of the monitoring of the operating state of the particulate filter.

Claims

REVENDICATIONS
1-Système de diagnostic de l'état de fonctionnement d'un dispositif d'admission en gaz pour moteur à combustion interne de véhicule automobile, le dispositif comportant une conduite d'admission (28) en air. frais et une conduite de recirculation (32) de gaz d'échappement pourvue d'au moins une vanne de recirculation (34,1-System for diagnosing the operating state of a gas intake device for an internal combustion engine of a motor vehicle, the device comprising an intake duct (28) made of air. an exhaust gas recirculation line (32) provided with at least one recirculation valve (34,
36), ladite conduite de recirculation étant reliée à la conduite d'admission et à une ligne d'échappement équipée d'un filtre à particules (54), caractérisé en ce qu' il comprend des moyens de détermination (62, 66) de la masse de particules présentes dans la ligne, d'échappement en aval du filtre à particules et en amont de la conduite de recirculation (32), et une unité de contrôle (60) apte à piloter la vanne de recirculation à partir de la masse de particules déterminée et du pourcentage d'ouverture de ladite vanne, et indépendamment d'une surveillance de l'état de fonctionnement du filtre à particules.36), said recirculation pipe being connected to the intake pipe and to an exhaust line equipped with a particle filter (54), characterized in that it comprises means (62, 66) for determining the mass of particles present in the exhaust line downstream of the particulate filter and upstream of the recirculation line (32), and a control unit (60) able to control the recirculation valve from the mass of determined particles and the percentage of opening of said valve, and independently of a monitoring of the operating state of the particulate filter.
2-Système selon la revendication 1 , dans lequel les moyens de détermination comportent un capteur (62) de mesure du taux de particules présentes dans les gaz d'échappement monté entre le filtre à particules et la conduite de recirculation, et un moyen de détection2-System according to claim 1, wherein the determining means comprises a sensor (62) for measuring the amount of particles present in the exhaust gas mounted between the particulate filter and the recirculation line, and a detection means
(66) du débit vo lumique des gaz d'échappement au niveau dudit filtre.(66) the flow velocity of the exhaust gas at said filter.
3-Système selon la revendication 1 ou 2, comprenant un échangeur de chaleur (38) monté sur la conduite de recirculation pour refroidir les gaz d'échappement recyclés, l'unité de contrôle (60) comprenant des moyens de détermination de la masse de particules présentes au niveau de l'échangeur de chaleur.3-System according to claim 1 or 2, comprising a heat exchanger (38) mounted on the recirculation pipe for cooling the recycled exhaust gas, the control unit (60) comprising means for determining the mass of the particles present at the heat exchanger.
4-Système selon la revendication 3, dans lequel l'unité de contrôle (60) comprend un moyen de comparaison de la masse de particules présentes au niveau de l'échangeur de chaleur (38) avec une valeur seuil de détection de dysfonctionnement dudit échangeur de chaleur.4-System according to claim 3, wherein the control unit (60) comprises means for comparing the mass of particles present at the level of the heat exchanger (38) with a threshold value for detecting malfunction of said heat exchanger.
5-Système selon l'une quelconque des revendicatio ns précédentes, dans lequel la conduite de recirculation (32) comporte une première vanne de recirculation (34) montée entre la ligne d'échappement et un échangeur de chaleur (38), et une seconde vanne de recirculation (36) montée entre ledit échangeur de chaleur et la conduite d'admission en air frais.A system according to any one of the preceding claims, wherein the recirculation line (32) comprises a first recirculation valve (34) mounted between the exhaust line and a heat exchanger (38), and a second recirculation valve (36) mounted between said heat exchanger and the fresh air intake pipe.
6-Système selon la revendication 5, dans lequel l' unité de contrôle (60) est apte à piloter la seconde vanne de recirculation (36) à partir de la masse de particules déterminée et des pourcentages d'ouverture des première et seconde vannes de recirculation.6-System according to claim 5, wherein the control unit (60) is adapted to drive the second recirculation valve (36) from the determined mass of particles and the opening percentages of the first and second valves of recirculation.
7- Système selon la revendication 5 ou 6, dans lequel le dispositif comporte un compresseur (24), l'unité de contrôle comprenant des moyens de détermination de la masse de particules présentes au niveau dudit compresseur.7- System according to claim 5 or 6, wherein the device comprises a compressor (24), the control unit comprising means for determining the mass of particles present at said compressor.
8-Système selon la revendication 7, dans lequel l'unité de contrôle (60) comprend un moyen de comparaison de la masse de particules présentes au niveau du compresseur (24) avec une valeur seuil de détection de dysfonctionnement dudit compresseur.8-System according to claim 7, wherein the control unit (60) comprises means for comparing the mass of particles present at the compressor (24) with a threshold value for detecting the malfunction of said compressor.
9-Système selon Tune quelconque des revendications précédentes, dans lequel le dispositif comporte une conduite d'admission (26) en gaz pourvue d'une vanne d'admission (27), l' unité de contrôle étant apte à piloter la vanne d'admission à partir de la masse de particules déterminée et des pourcentages d'ouverture de la ou des vannes de recirculation et de ladite vanne d' admission.9-System according to any one of the preceding claims, wherein the device comprises a gas inlet pipe (26) provided with an inlet valve (27), the control unit being able to control the valve of admission from the determined mass of particles and percentages of opening of the recirculation valve (s) and of said inlet valve.
10-Système selon la revendication 9, dans lequel l 'unité de contrôle (60) comprend des moyens de détermination de la masse de particules présentes dans la conduite d'admission (26) en gaz. 1 1-Système selon la revendication 10, dans lequel l'unité de contrôle (60) comprend un moyen de comparaison de la masse de particules présentes dans la conduite d'admission (26) en gaz avec une valeur seuil de détection de dysfonctionnement de ladite conduite d'admission.10-System according to claim 9, wherein the control unit (60) comprises means for determining the mass of particles present in the gas intake duct (26). 1-System according to claim 10, wherein the control unit (60) comprises a means for comparing the mass of particles present in the gas intake duct (26) with a threshold value of detection of malfunction of said intake duct.
12-Procédé de diagnostic de l'état de fonctionnement d'un dispositif d'admission en gaz pour moteur à combustion interne de véhicule automobile, le dispositif comportant une conduite d'admission en air frais et une conduite de recirculation de gaz d'échappement pourvue d'au moins une vanne de recirculation, ladite conduite de recirculation étant reliée à la conduite d'admission et à une ligne d'échappement équipée d'un filtre à particules, caractérisé en ce qu'on détermine la masse de particules présentes dans la ligne d'échappement en aval du filtre à particules et en amont de la conduite de recirculation, et on pilote la vanne de recirculation à partir de la masse de particules déterminée et du pourcentage d'ouverture de ladite vanne, et indépendamment d'une surveillance de l'état de fonctionnement du filtre à particules. 12-Method for diagnosing the operating state of a gas intake device for an internal combustion engine of a motor vehicle, the device comprising a fresh air intake pipe and an exhaust gas recirculation pipe provided with at least one recirculation valve, said recirculation pipe being connected to the intake pipe and to an exhaust line equipped with a particle filter, characterized in that the mass of particles present in the the exhaust line downstream of the particulate filter and upstream of the recirculation line, and the recirculation valve is piloted from the determined mass of particles and the percentage of opening of said valve, and independently of a monitoring of the operating state of the particulate filter.
PCT/FR2009/000385 2008-04-01 2009-04-01 System and method for diagnosing the operational condition of an exhaust gas inlet device for automobile internal combustion engine WO2009133281A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP09738315A EP2262997A1 (en) 2008-04-01 2009-04-01 System and method for diagnosing the operational condition of an exhaust gas inlet device for automobile internal combustion engine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0852156 2008-04-01
FR0852156A FR2929332B1 (en) 2008-04-01 2008-04-01 SYSTEM AND METHOD FOR DIAGNOSING THE OPERATING STATE OF A GAS INTAKE DEVICE FOR AN INTERNAL COMBUSTION ENGINE OF A MOTOR VEHICLE.

Publications (1)

Publication Number Publication Date
WO2009133281A1 true WO2009133281A1 (en) 2009-11-05

Family

ID=39865705

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FR2009/000385 WO2009133281A1 (en) 2008-04-01 2009-04-01 System and method for diagnosing the operational condition of an exhaust gas inlet device for automobile internal combustion engine

Country Status (3)

Country Link
EP (1) EP2262997A1 (en)
FR (1) FR2929332B1 (en)
WO (1) WO2009133281A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012015505A1 (en) * 2010-07-26 2012-02-02 International Engine Intellectual Property Company, Llc Aftertreatment burner air supply system
CN111458278A (en) * 2019-01-18 2020-07-28 上海沃尔沃汽车研发有限公司 Engine exhaust particle counting and measuring system and method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2968036B1 (en) * 2010-11-26 2016-08-05 Peugeot Citroen Automobiles Sa A METHOD OF CONTROLLING A VEHICLE ENGINE AND A VEHICLE ADAPTED TO CARRY OUT SAID METHOD

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006045689A1 (en) * 2005-09-28 2007-03-29 Ford Global Technologies, LLC, Dearborn System and method for operating an engine with an exhaust gas recirculation system
DE102006057528A1 (en) * 2005-12-06 2007-06-14 Ford Global Technologies, LLC, Dearborn Particulate sensor diagnostic performing apparatus for e.g. automobile, has electronic engine controller performing diagnostic of downstream sensor when quantities of particulate matter are dislodged from exhaust system walls
FR2910546A1 (en) * 2006-12-22 2008-06-27 Renault Sas Diesel engine controlling method for motor vehicle, involves correcting set points of operating parameters of diesel engine based on estimation of clogging state of exhaust gas recirculation heat exchanger

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7765792B2 (en) * 2005-10-21 2010-08-03 Honeywell International Inc. System for particulate matter sensor signal processing

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006045689A1 (en) * 2005-09-28 2007-03-29 Ford Global Technologies, LLC, Dearborn System and method for operating an engine with an exhaust gas recirculation system
DE102006057528A1 (en) * 2005-12-06 2007-06-14 Ford Global Technologies, LLC, Dearborn Particulate sensor diagnostic performing apparatus for e.g. automobile, has electronic engine controller performing diagnostic of downstream sensor when quantities of particulate matter are dislodged from exhaust system walls
FR2910546A1 (en) * 2006-12-22 2008-06-27 Renault Sas Diesel engine controlling method for motor vehicle, involves correcting set points of operating parameters of diesel engine based on estimation of clogging state of exhaust gas recirculation heat exchanger

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012015505A1 (en) * 2010-07-26 2012-02-02 International Engine Intellectual Property Company, Llc Aftertreatment burner air supply system
CN111458278A (en) * 2019-01-18 2020-07-28 上海沃尔沃汽车研发有限公司 Engine exhaust particle counting and measuring system and method

Also Published As

Publication number Publication date
FR2929332B1 (en) 2012-12-14
EP2262997A1 (en) 2010-12-22
FR2929332A1 (en) 2009-10-02

Similar Documents

Publication Publication Date Title
WO2013175091A1 (en) Internal combustion engine fitted with an exhaust gas recirculation (egr) system and associated method for controlling the recirculation of gases
EP2262997A1 (en) System and method for diagnosing the operational condition of an exhaust gas inlet device for automobile internal combustion engine
EP3387230B1 (en) Method for diagnosing a catalyst for selective reduction of nitrogen oxides of an engine and associated device
WO2006111675A1 (en) Method and device for diagnosing the operating condition of an internal combustion engine exhaust line
EP3077637B1 (en) Method for optimizing the detection of a defective catalytic converter
FR2938010A1 (en) METHOD FOR MONITORING A PARTICLE FILTER
FR2935437A1 (en) METHOD FOR DETERMINING THE LOADING INTO SUES OF A PARTICLE FILTER
JP4744529B2 (en) Device for estimating the amount of particulates present in automobile particulate filters
EP2992193B1 (en) Device and method for monitoring a treatment component for gaseous emissions of an exhaust system of an internal combustion engine
EP1650420B1 (en) System and method for regulation of the particulate filter regeneration of an internal combustion engine
FR2928967A1 (en) Exhaust gas post-treatment device i.e. particle filter, regenerating method for motor vehicle's diesel engine, involves verifying whether risk situation is raised, in case of detected risk, increasing of recirculation and reducing of intake
WO2006064145A1 (en) Device for controlling regeneration of a particulate filter for an internal combustion engine and corresponding method
FR2923537A1 (en) Pressure estimation system for diesel engine of motor vehicle, has calculation unit calculating pressure drop ratio of turbine from magnitude representing variation relative to temperature between inlet and outlet of turbine
FR2921122A3 (en) Intake gas temperature regulating system, has detecting unit detecting parameters representing operating state of gas treating device, and electronic control unit controlling increasing unit based on detected parameters at level of device
FR2990244A1 (en) METHOD FOR TREATING EXHAUST GAS OF A SUPERCHARGED ENGINE WITH EXHAUST GAS RECYCLING
EP2299094A1 (en) Method for controlling a supercharged diesel engine with low-pressure exhaust gas recirculation
FR2953559A1 (en) SYSTEM AND METHOD FOR ESTIMATING THE MASS OF PARTICLES STORED IN A PARTICLE FILTER OF A MOTOR VEHICLE
FR2915514A1 (en) Fuel particle mass estimating method for e.g. diesel engine, has comparison unit comparing mass of particles at starting of phase and mass of eliminated particles during phase to determine mass of particles remaining within filter
FR2906839A1 (en) SYSTEM AND METHOD FOR ESTIMATING THE QUANTITY OF PARTICLES SPILLED BY A PARTICLE FILTER
EP4112898A1 (en) Method for correcting a temperature value measured by a temperature sensor
FR2876737A1 (en) Particle filter`s regeneration phase controlling system for motor vehicle, has control system for interrupting regeneration phase of filter when temperature rise, detected in downstream of filter during phase, is lesser than threshold value
FR2879245A1 (en) Retained combustible particle, e.g. polluting soot, instantaneous mass determining device for motor vehicle, has interpolation unit to deduce mass based on comparison of measured temperature and temperature change at particle filter exit
FR2915515A1 (en) Particle mass estimating system for particle filter in oil engine of motor vehicle, has summer determining mass of particles remaining in filter based on mass obtained from determination unit and mass obtained from dynamic model
FR3013078A1 (en) METHOD FOR CONTROLLING THE OPERATION OF AN EXHAUST GAS RECIRCULATION VALVE, ESPECIALLY FOR INTERNAL COMBUSTION ENGINE WITH COMMAND IGNITION
WO2006042987A1 (en) System and method for regulating and regenerating a particulate filter of an internal combustion engine

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 09738315

Country of ref document: EP

Kind code of ref document: A1

REEP Request for entry into the european phase

Ref document number: 2009738315

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 2009738315

Country of ref document: EP

NENP Non-entry into the national phase

Ref country code: DE