EP2191125B1 - Procede de diagnostic du volet de derivation de l'echangeur dans un systeme de recirculation des gaz d'echappement - Google Patents

Procede de diagnostic du volet de derivation de l'echangeur dans un systeme de recirculation des gaz d'echappement Download PDF

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Publication number
EP2191125B1
EP2191125B1 EP08837336.0A EP08837336A EP2191125B1 EP 2191125 B1 EP2191125 B1 EP 2191125B1 EP 08837336 A EP08837336 A EP 08837336A EP 2191125 B1 EP2191125 B1 EP 2191125B1
Authority
EP
European Patent Office
Prior art keywords
egr
exchanger
temperature
mode
tsegr
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP08837336.0A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2191125A2 (fr
Inventor
Julien Allard
Clement Petit
Ronan Le Bras
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Renault SAS
Original Assignee
Renault SAS
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Application filed by Renault SAS filed Critical Renault SAS
Publication of EP2191125A2 publication Critical patent/EP2191125A2/fr
Application granted granted Critical
Publication of EP2191125B1 publication Critical patent/EP2191125B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • 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
    • F02M26/13—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
    • F02M26/33—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 controlling the temperature of the recirculated gases
    • 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
    • F02M26/49—Detecting, diagnosing or indicating an abnormal function of the EGR system
    • 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
    • F02D41/0025—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
    • F02D2041/0067—Determining the EGR temperature
    • 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
    • F02D41/0055—Special engine operating conditions, e.g. for regeneration of exhaust gas treatment apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—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
    • 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

Definitions

  • the present invention relates to a method for diagnosing a failure of the EGR circuit of an engine, specifically the blocking of the bypass flap of the EGR exchanger.
  • the bypass flap is a key element of the exhaust gas recirculation system (designated by the acronym EGR - Exhaust Gas Recirculation according to the English terminology).
  • the proper functioning of the shutter thus makes it possible to guarantee the depollution of the current diesel engines.
  • the blocking of the shutter in bypass mode or in cooled mode has direct consequences on the pollution emitted at the output of the engine.
  • the risk associated with blocking the flap is also not related solely to pollution. Indeed, a failure of the shutter can have consequences on the reliability of the surrounding components (degradation due to a too high temperature of the EGR valve and its support) and the integrity of the engine control strategies that use it (such as example that the cleaning of the valve and the exchanger, or the priming of the catalyst).
  • a first method uses a temperature sensor located at the entrance of the intake manifold and can diagnose a blockage of the flap by measuring the temperature difference between the cool mode and bypass mode.
  • this method requires the actuation of the shutter to be able to perform the diagnosis.
  • it does not detect the position in which the shutter has blocked; however, the blocking in bypass or cooled mode does not have the same impact on pollution and we want to act differently in these two cases.
  • this process seems relatively imprecise because the temperature sensor located at the inlet of the inlet distributor is influenced by the fresh air admitted.
  • Another process described in the document JP 2003-247459 , implements a strategy based on the monitoring of the air flow before and after the activation of the bypass flap, the air intake flap and the EGR valve being completely open.
  • the advantage of this solution is that it simply uses the flowmeter located on the fresh air intake duct.
  • this strategy can generate a significant rate of false detections, due to the EGR environment (high temperature, fouling of the connectors) and the limited reactivity of the shutter control. Indeed, pressure wave phenomena delay the vacuum control of the bypass flap. In addition, it requires an intrusion into the operation of the engine, since it requires to open the air intake flap and the EGR valve.
  • the document US-2006/0042608 describes in particular a method for diagnosing the operation of an EGR circuit.
  • the document JP-2008144609 describes a method for diagnosing a failure of the EGR circuit of an internal combustion engine and more particularly of the flap regulating the distribution of the exhaust gases between the EGR exchanger and a bypass duct of the exchanger or bypass .
  • An object of the invention is therefore to define a simple and reliable, non-intrusive method for detecting any failure of the bypass flap and, where appropriate, the position in which it has blocked. This method must also make it possible to diagnose a total loss of the cooling function.
  • an engine compartment comprises an internal combustion engine 10, supplied with fresh air by an intake duct 11 and releasing its exhaust gas through an exhaust duct 12.
  • this engine compartment is also provided with a turbocharger 50 comprising a compressor 51 disposed on the intake duct 11 for compressing the air coming from the duct 53.
  • cooling means 40 and a shutter 30 are provided between the compressor 51 and the engine 10. The air which reaches the engine 10 is cold.
  • the turbine 52 of the turbocharger 50 is located at the end of the duct exhaust pipe 12 and is coupled to the compressor 51. The exhaust gas is then discharged from the engine compartment via a pipe 54.
  • the engine compartment further comprises an exhaust gas recirculation circuit (also called EGR circuit 20), the inlet 28 of which is connected to the exhaust duct 12 and whose outlet 29 is connected to the intake duct 11.
  • This EGR circuit 20 comprises an EGR cooler or exchanger 22 connected to the inlet 28 via an upstream pipe 25 and to the outlet 29 via a downstream pipe 27, enabling the exhaust gases to be cooled before being reinjected into the engine 10 .
  • a bypass pipe 24 connected, in its upstream part, to a solenoid valve 23 located upstream of the EGR exchanger 22, and in its downstream part, at the outlet of the exchanger 22.
  • the solenoid valve 23 comprises a flap 23a which, depending on its position, allows a desired quantity of exhaust gas to pass through the bypass duct 24.
  • An EGR valve 21 is further provided at the outlet of the circuit 20 so as to regulate the amount of exhaust gas reinjected into the engine 10.
  • the figure 2 represents an EGR exchanger 22 with an integrated bypass duct 24. If the flap 23a is closed, all the hot exhaust gases (solid arrow) pass into the EGR exchanger where they are cooled (hatched arrows): this is called “cooled mode”. If against the flap 23a is open, at least a portion of the exhaust gas pass into the bypass duct 24 and are not cooled: it is called “bypass mode”. It is therefore understood that the temperature TsEGR of the exhaust gas at the outlet of the exchanger 22 is higher in bypass mode (TsEGR2) than in cooled mode (TsEGR1).
  • the diagnostic strategy is based on measuring or estimating the temperature at the outlet of the EGR exchanger 22. This Depending on the case, the temperature may be measured upstream or downstream of the EGR valve 21.
  • the strategy is based on calculating the difference between the estimated TsEGR in bypass mode (denoted TsEGR est-byp ) and the measured TsEGR (denoted TsEGR mes ).
  • the filling efficiency is determined by means of the temperature Tcol and the pressure Pcol in the intake manifold; these values are given by sensors located in the intake manifold.
  • TsEGR est_byp ⁇ 3 ⁇ Tco + 1 - ⁇ 3 ⁇ Tavt ⁇ 1 - ⁇ 2 + ⁇ 2 ⁇ ⁇ 1 ⁇ Tco - Tavt + Tavt
  • TsEGR temperature sensors
  • the blocking causes of the flap 23a may be a mechanical seizure, the disconnection of the hose of the bypass solenoid valve 23 or a control problem.
  • DTC Diagnostic Trouble Code
  • OBD On Board Diagnosis
  • a degraded mode is activated, consisting in closing the EGR valve 21 in order to reduce the temperature at its terminals.
  • This strategy is implemented in the engine control unit (ECU).
  • the figure 5 illustrates the case of a functional component.
  • the curve C1 in the form of a slot corresponds to the state of the control of the bypass flap: the high value corresponds to the bypass mode, the low value corresponds to the cooled mode.
  • the curve C2 in the form of a slot corresponds to the diagnostic condition: the high values correspond to the diagnostic phases.
  • the EGR circuit is in bypass mode and the temperature difference ⁇ bm is lower than the detection threshold in bypass mode S bm : the flap is therefore considered to be functional.
  • the EGR circuit is in cooled mode, and the temperature difference ⁇ cm is greater than the detection threshold in cooled mode S cm : the flap is thus detected as functional.
  • Curves C1 and C2 are defined in the same way as in the figure 5 .
  • the EGR circuit is in bypass mode.
  • the temperature difference ⁇ bm remains higher than the detection threshold in bypass mode S bm during a duration Tbm: the shutter is thus considered as blocked in cooled mode.
  • Curves C1 and C2 are defined in the same way as in figures 5 and 6 .
  • the EGR circuit is in bypass mode. Since the temperature difference ⁇ bm is less than S bm , the flap is considered functional.
  • the use for the diagnosis of a temperature sensor at the outlet of the EGR exchanger improves the reliability of detection of the process.
  • this temperature sensor can advantageously be used, as needed, for other diagnostic purposes.
  • the method according to the invention makes it possible to detect a total loss of the cooling function; failures leading to this loss - for example, a water leak - are however rarer.
  • the method of the invention also has the advantage of not being intrusive, that is to say that it does not require actuating the bypass flap for check its functionality.
  • the implementation of this method does not cause additional pollution.
  • this strategy makes it possible to know the position in which the bypass pane is blocked: this information is necessary for the proper operation of the degraded mode (ie only if the pane is blocked in bypass mode), which represents an additional gain in terms of depollution.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Analytical Chemistry (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
EP08837336.0A 2007-09-20 2008-09-19 Procede de diagnostic du volet de derivation de l'echangeur dans un systeme de recirculation des gaz d'echappement Not-in-force EP2191125B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0757714A FR2921426B1 (fr) 2007-09-20 2007-09-20 Procede de diagnostic du volet de derivation de l'echangeur dans un systeme de recirculation des gaz d'echappement
PCT/FR2008/051689 WO2009047465A2 (fr) 2007-09-20 2008-09-19 Procede de diagnostic du volet de derivation de l'echangeur dans un systeme de recirculation des gaz d'echappement

Publications (2)

Publication Number Publication Date
EP2191125A2 EP2191125A2 (fr) 2010-06-02
EP2191125B1 true EP2191125B1 (fr) 2017-06-14

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP08837336.0A Not-in-force EP2191125B1 (fr) 2007-09-20 2008-09-19 Procede de diagnostic du volet de derivation de l'echangeur dans un systeme de recirculation des gaz d'echappement

Country Status (5)

Country Link
US (1) US20100307231A1 (ja)
EP (1) EP2191125B1 (ja)
JP (1) JP2010539390A (ja)
FR (1) FR2921426B1 (ja)
WO (1) WO2009047465A2 (ja)

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US8342015B2 (en) 2007-09-20 2013-01-01 Renault S.A.S. Method for diagnosing the exchanger bypass flap in an exhaust gas recirculation circuit
FR2938016B1 (fr) * 2008-10-30 2010-10-29 Renault Sas Procede d'estimation dynamique du debit d'air frais alimentant un moteur avec circuits egr haute et basse pression
JP5251844B2 (ja) * 2009-11-24 2013-07-31 トヨタ自動車株式会社 冷却装置の異常判定装置および冷却装置の異常判定方法
US9127606B2 (en) * 2010-10-20 2015-09-08 Ford Global Technologies, Llc System for determining EGR degradation
US9476387B2 (en) * 2011-05-13 2016-10-25 Ford Global Technologies, Llc System for determining EGR cooler degradation
SE537803C2 (sv) * 2011-09-30 2015-10-20 Scania Cv Ab EGR-kylare samt förbränningsmotor med en sådan EGR-kylare
US9670830B2 (en) * 2014-10-29 2017-06-06 GM Global Technology Operations LLC Method and apparatus for monitoring a coolant system for an exhaust gas recirculation system
KR101896326B1 (ko) * 2016-09-09 2018-09-07 현대자동차 주식회사 수냉식 이지알 쿨러
US20180128145A1 (en) * 2016-11-09 2018-05-10 Ford Global Technologies, Llc Method and system for an exhaust diverter valve
DE102017210714A1 (de) 2017-06-26 2018-12-27 Wafios Aktiengesellschaft Verfahren zur Herstellung eines Biegeteils und Biegemaschine zur Durchführung des Verfahrens
US11932080B2 (en) 2020-08-20 2024-03-19 Denso International America, Inc. Diagnostic and recirculation control systems and methods
US11760170B2 (en) 2020-08-20 2023-09-19 Denso International America, Inc. Olfaction sensor preservation systems and methods
US11881093B2 (en) 2020-08-20 2024-01-23 Denso International America, Inc. Systems and methods for identifying smoking in vehicles
US11828210B2 (en) 2020-08-20 2023-11-28 Denso International America, Inc. Diagnostic systems and methods of vehicles using olfaction
US11813926B2 (en) 2020-08-20 2023-11-14 Denso International America, Inc. Binding agent and olfaction sensor
US11636870B2 (en) 2020-08-20 2023-04-25 Denso International America, Inc. Smoking cessation systems and methods
US11760169B2 (en) 2020-08-20 2023-09-19 Denso International America, Inc. Particulate control systems and methods for olfaction sensors

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Also Published As

Publication number Publication date
JP2010539390A (ja) 2010-12-16
EP2191125A2 (fr) 2010-06-02
US20100307231A1 (en) 2010-12-09
FR2921426A1 (fr) 2009-03-27
WO2009047465A3 (fr) 2009-06-04
FR2921426B1 (fr) 2014-02-14
WO2009047465A2 (fr) 2009-04-16

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