WO2025203207A1 - Procédé de diagnostic de détérioration de catalyseur et dispositif de diagnostic de détérioration de catalyseur pour moteur à combustion interne ayant un turbocompresseur d'échappement - Google Patents

Procédé de diagnostic de détérioration de catalyseur et dispositif de diagnostic de détérioration de catalyseur pour moteur à combustion interne ayant un turbocompresseur d'échappement

Info

Publication number
WO2025203207A1
WO2025203207A1 PCT/JP2024/011823 JP2024011823W WO2025203207A1 WO 2025203207 A1 WO2025203207 A1 WO 2025203207A1 JP 2024011823 W JP2024011823 W JP 2024011823W WO 2025203207 A1 WO2025203207 A1 WO 2025203207A1
Authority
WO
WIPO (PCT)
Prior art keywords
exhaust
downstream
signal
deterioration diagnosis
purification catalyst
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.)
Pending
Application number
PCT/JP2024/011823
Other languages
English (en)
Japanese (ja)
Inventor
康文 黒田
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.)
Nissan Motor Co Ltd
Original Assignee
Nissan Motor Co Ltd
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 Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Priority to PCT/JP2024/011823 priority Critical patent/WO2025203207A1/fr
Publication of WO2025203207A1 publication Critical patent/WO2025203207A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus
    • 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
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12—Control of the pumps
    • F02B37/18—Control of the pumps by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
    • 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 exhaust turbocharger's exhaust turbine is located downstream of the internal combustion engine's cylinders, and an exhaust purification catalyst is located downstream of this exhaust turbine.
  • An upstream exhaust sensor is located upstream of the exhaust purification catalyst to detect signals related to the components of the exhaust flowing into the exhaust purification catalyst, while a downstream exhaust sensor is located immediately downstream of the exhaust purification catalyst to detect signals related to the components of the exhaust after passing through the exhaust purification catalyst.
  • a control device installed in the internal combustion engine compares the waveforms of the signals from the upstream exhaust sensor and the downstream exhaust sensor to diagnose deterioration of the exhaust purification catalyst.
  • the present invention was made with an eye on these issues, and one of its objectives is to provide a catalyst deterioration diagnosis method and device for an internal combustion engine that makes it possible to diagnose the deterioration of an exhaust purification catalyst without having to install an exhaust sensor immediately downstream of the exhaust purification catalyst.
  • the present invention relates to a catalyst deterioration diagnosis method for an internal combustion engine that includes an exhaust purification catalyst arranged in an upstream exhaust pipe connecting the cylinders of the internal combustion engine having an exhaust turbocharger to the exhaust turbine of the exhaust turbocharger; a bypass passage that releases a portion of the exhaust gas that has passed through the exhaust purification catalyst to the downstream exhaust pipe; a wastegate valve that adjusts the flow rate of the portion of the exhaust gas that passes through the bypass passage; a first exhaust sensor arranged in the upstream exhaust pipe upstream of the exhaust purification catalyst; a second exhaust sensor arranged in the downstream exhaust pipe downstream of the junction of the downstream exhaust pipe and the bypass passage; and a control device that has a deterioration diagnosis unit that performs deterioration diagnosis of the exhaust purification catalyst using a first signal and a second signal.
  • deterioration diagnosis of the exhaust purification catalyst is performed based on a comparison of the waveform of the first signal with the waveform of the second signal.
  • exhaust gas that passes through the exhaust purification catalyst is directed to the second exhaust sensor, which is located downstream of the confluence.
  • deterioration of the exhaust purification catalyst can be diagnosed using the second exhaust sensor, even if an exhaust sensor is not installed immediately downstream of the exhaust purification catalyst.
  • 1 is a diagram illustrating the configuration of an internal combustion engine according to an embodiment of the present invention
  • 2 is a flowchart illustrating a method for diagnosing catalyst deterioration in an internal combustion engine according to an embodiment.
  • the internal combustion engine of the present invention is applied as an internal combustion engine used in a series hybrid vehicle.
  • the internal combustion engine of the present invention is not limited to internal combustion engines used in series hybrid vehicles, but may also be used in other hybrid vehicles, such as parallel hybrid vehicles, or other vehicles with internal combustion engines.
  • the engine body 1 has an intake passage 4 through which air drawn into each cylinder 2 flows (only the passage upstream of the compressor 5 is shown in Figure 1), and an exhaust passage 6 through which exhaust gas discharged from each cylinder 2 flows.
  • the exhaust passage 6 has an upstream exhaust pipe 8 that connects each cylinder 2 of the engine body 1 of the internal combustion engine to the exhaust turbine 7 of the exhaust turbocharger 3, and a downstream exhaust pipe 9 that is connected downstream of the exhaust turbine 7 and through which exhaust gas that has passed through the exhaust turbine 7 flows.
  • the upstream exhaust pipe 8 has exhaust ports 10 that communicate with each cylinder 2, an exhaust manifold 11 that communicates with the exhaust ports 10, and piping 12 that communicates with the exhaust manifold 11.
  • the piping 12 is connected to the exhaust manifold 11 and the exhaust turbine 7.
  • a catalytic converter (exhaust purification catalyst) 13 consisting of a three-way catalyst is disposed in the pipe 12 of the upstream exhaust pipe 8, which purifies the exhaust gas passing through the pipe 12.
  • the part of the pipe 12 downstream of the catalytic converter 13 is connected to one end of a bypass passage 14, which bypasses the exhaust turbine 7 and is connected to the downstream exhaust pipe 9 located downstream of the exhaust turbine 7.
  • the bypass passage 14 allows a portion of the exhaust gas that has passed through the catalytic converter 13 to escape to the downstream exhaust pipe 9.
  • a first exhaust sensor 16 is disposed in the upstream exhaust pipe 8 upstream of the catalytic converter 13 and downstream of the exhaust manifold 11, to detect a first signal related to the components of the exhaust flowing into the catalytic converter 13.
  • the first exhaust sensor 16 is an air-fuel ratio sensor that detects the air-fuel ratio of the exhaust flowing into the catalytic converter 13, or an O2 (oxygen) sensor that detects the amount of oxygen in the exhaust flowing into the catalytic converter 13.
  • the first signal detected by the first exhaust sensor 16 is input to a control device (not shown).
  • a gasoline particulate filter (GPF) (not shown) is located in the downstream exhaust pipe 9 downstream of the second exhaust sensor 17 to remove particulate matter (PM) from the exhaust.
  • GPF gasoline particulate filter
  • the possibility of deterioration of the catalytic converter 13 is determined based on a comparison between the waveform of the air-fuel ratio acquired by the first exhaust sensor 16 and the waveform of the air-fuel ratio acquired by the second exhaust sensor 17, which is the air-fuel ratio waveform for the exhaust flowing from the catalytic converter 13 through the downstream exhaust pipe 9 via the piping 12 and the exhaust turbine 7.
  • the air-fuel ratio acquired by the second exhaust sensor 17 corresponds to both the exhaust gas flowing through the downstream exhaust pipe 9 via the pipe 12 and bypass passage 14 and the exhaust gas flowing from the catalytic converter 13 through the pipe 12 and exhaust turbine 7 to the downstream exhaust pipe 9, with the air-fuel ratio associated with the latter exhaust gas accounting for the majority of the air-fuel ratio.
  • the air-fuel ratio waveform acquired by the second exhaust sensor 17 has a waveform with a smaller amplitude than the amplitude of the air-fuel ratio waveform detected by the first exhaust sensor 16, it is determined that there is a possibility of deterioration of the catalytic converter 13. If there is a possibility of deterioration of the catalytic converter 13, a waveform with a smaller amplitude will be acquired downstream of the catalytic converter 13.
  • this air-fuel ratio is much smaller than the air-fuel ratio of the large amount of exhaust that is quickly guided through a relatively short flow path including the downstream exhaust pipe 9 via the piping 12 and the bypass passage 14. Furthermore, in the second-stage deterioration diagnosis, the exhaust is quickly guided to the second exhaust sensor 17 side through this relatively short flow path, so the air-fuel ratio waveform of the exhaust that has passed through the catalytic converter 13 is less likely to be rounded, thereby improving the diagnostic accuracy compared to the first-stage deterioration diagnosis.
  • the air-fuel ratio waveform acquired by the second exhaust sensor 17 has a waveform with a smaller amplitude than the amplitude of the air-fuel ratio waveform detected by the first exhaust sensor 16, it is determined that the catalytic converter 13 has deteriorated.
  • step S2 the second exhaust sensor 17 acquires a second signal relating to the air-fuel ratio of the exhaust downstream of the catalytic converter 13 and downstream of the junction A between the downstream exhaust pipe 9 and the bypass passage 14.
  • step S4 determines that the waveform has the above-mentioned small amplitude, it is assumed that there is a possibility of deterioration of the catalytic converter 13, and the process moves to the second stage of deterioration diagnosis shown in step S5, and in step S6, the opening of the wastegate valve 15 is increased.
  • a catalytic converter 13 is arranged in the upstream exhaust pipe 8 connecting the cylinder 2 of the internal combustion engine and the exhaust turbine 7 of the exhaust turbocharger 3, i.e., the catalytic converter 13 is arranged downstream of the cylinder 2, and the exhaust turbine 7 of the exhaust turbocharger 3 is arranged downstream of this catalytic converter 13.
  • a bypass passage 14 is provided to release a portion of the exhaust gas that has passed through the catalytic converter 13 to the downstream exhaust pipe 9, and a wastegate valve 15 is also provided in this bypass passage 14.
  • a first exhaust sensor 16 and a second exhaust sensor 17 are provided so that they can be used to diagnose deterioration of the catalytic converter 13.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Supercharger (AREA)

Abstract

Selon la présente invention, un moteur à combustion interne ayant un turbocompresseur d'échappement (3) comprend : un convertisseur catalytique (13) disposé dans un tuyau d'échappement côté amont (8) reliant un cylindre (2) et une turbine d'échappement (7) du turbocompresseur d'échappement (3) ; un passage de dérivation (14) pour libérer une partie d'un gaz d'échappement s'écoulant à travers le convertisseur catalytique (13) vers un tuyau d'échappement côté aval (9) ; une vanne à passage direct de décharge (15) pour régler le débit du gaz d'échappement s'écoulant à travers le passage de dérivation (14) ; un premier capteur d'échappement (16) disposé en amont du convertisseur catalytique (13) dans le tuyau d'échappement côté amont (8) ; et un deuxième capteur d'échappement (17) disposé en aval d'une partie de confluence (A) entre le tuyau d'échappement côté aval (9) et le passage de dérivation (14) dans le tuyau d'échappement côté aval (9). Un dispositif de commande diagnostique la détérioration du convertisseur catalytique (13) sur la base d'une comparaison entre un premier signal provenant du premier capteur d'échappement (16) et un deuxième signal provenant du deuxième capteur d'échappement (17).
PCT/JP2024/011823 2024-03-26 2024-03-26 Procédé de diagnostic de détérioration de catalyseur et dispositif de diagnostic de détérioration de catalyseur pour moteur à combustion interne ayant un turbocompresseur d'échappement Pending WO2025203207A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2024/011823 WO2025203207A1 (fr) 2024-03-26 2024-03-26 Procédé de diagnostic de détérioration de catalyseur et dispositif de diagnostic de détérioration de catalyseur pour moteur à combustion interne ayant un turbocompresseur d'échappement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2024/011823 WO2025203207A1 (fr) 2024-03-26 2024-03-26 Procédé de diagnostic de détérioration de catalyseur et dispositif de diagnostic de détérioration de catalyseur pour moteur à combustion interne ayant un turbocompresseur d'échappement

Publications (1)

Publication Number Publication Date
WO2025203207A1 true WO2025203207A1 (fr) 2025-10-02

Family

ID=97219889

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2024/011823 Pending WO2025203207A1 (fr) 2024-03-26 2024-03-26 Procédé de diagnostic de détérioration de catalyseur et dispositif de diagnostic de détérioration de catalyseur pour moteur à combustion interne ayant un turbocompresseur d'échappement

Country Status (1)

Country Link
WO (1) WO2025203207A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000328930A (ja) * 1999-05-20 2000-11-28 Fuji Heavy Ind Ltd エンジンの触媒劣化診断装置
JP2005201169A (ja) * 2004-01-16 2005-07-28 Honda Motor Co Ltd 内燃機関の制御装置
JP2013155699A (ja) * 2012-01-31 2013-08-15 Daihatsu Motor Co Ltd 排気浄化装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000328930A (ja) * 1999-05-20 2000-11-28 Fuji Heavy Ind Ltd エンジンの触媒劣化診断装置
JP2005201169A (ja) * 2004-01-16 2005-07-28 Honda Motor Co Ltd 内燃機関の制御装置
JP2013155699A (ja) * 2012-01-31 2013-08-15 Daihatsu Motor Co Ltd 排気浄化装置

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