EP2196641A1 - Installation d'échappement pour un moteur à combustion interne - Google Patents

Installation d'échappement pour un moteur à combustion interne Download PDF

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Publication number
EP2196641A1
EP2196641A1 EP09450235A EP09450235A EP2196641A1 EP 2196641 A1 EP2196641 A1 EP 2196641A1 EP 09450235 A EP09450235 A EP 09450235A EP 09450235 A EP09450235 A EP 09450235A EP 2196641 A1 EP2196641 A1 EP 2196641A1
Authority
EP
European Patent Office
Prior art keywords
exhaust
exhaust gas
reflection chamber
pipe
diffuser
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.)
Granted
Application number
EP09450235A
Other languages
German (de)
English (en)
Other versions
EP2196641B1 (fr
Inventor
Roland Dr. Kirchberger
Mario Dr. Hirz
Gernot Dipl.-Ing. Koller
Franz Dipl.-Ing. Winkler
Matjaz Dr. Korman
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.)
Forschungsgesellschaft fur Verbrennungskraftmasch
Bayerische Motoren Werke AG
Original Assignee
Forschungsgesellschaft fur Verbrennungskraftmaschi Nen und Thermodynamik Mbh
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 Forschungsgesellschaft fur Verbrennungskraftmaschi Nen und Thermodynamik Mbh filed Critical Forschungsgesellschaft fur Verbrennungskraftmaschi Nen und Thermodynamik Mbh
Publication of EP2196641A1 publication Critical patent/EP2196641A1/fr
Application granted granted Critical
Publication of EP2196641B1 publication Critical patent/EP2196641B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
    • F01N1/026—Annular resonance chambers arranged concentrically to an exhaust passage and communicating with it, e.g. via at least one opening in the exhaust passage
    • 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
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/06—Silencing apparatus characterised by method of silencing by using interference effect
    • 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
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/14—Silencing apparatus characterised by method of silencing by adding air to exhaust gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • 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
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/16—Chambers with particular shapes, e.g. spherical

Definitions

  • the invention relates to an exhaust system for an internal combustion engine having at least one cylinder, the exhaust pipe has a merging into a sealed end reflection chamber diffuser and is connected between the diffuser and the cylinder to a at least one exhaust catalyst receiving exhaust gas outlet line.
  • the connected via a diffuser to the exhaust pipe, closed end reflection chamber also allows a gas-dynamic reaction to the exhaust gases to improve the purging and charging behavior of the two-stroke internal combustion engine by a corresponding vibration excitation of the exhaust gases.
  • the vibration behavior of the exhaust gases can not support the purging and the gas exchange to the extent expected.
  • the invention is therefore based on the object, an exhaust system of the type described in such a way that advantageous to the rinsing process and the charge exchange influence can be taken to improve performance and reduce pollutant emissions, both in two-stroke as well four-stroke internal combustion engines.
  • the invention solves this task in that the exhaust gas outlet line is in fluid communication with the exhaust gas line via a partition provided with passages for the exhaust gas.
  • the invention is based on the finding that the unavoidable irregularities in the exhaust gas duct in the region of the connection of the exhaust gas outlet line to the exhaust pipe coming from the cylinder have a great effect on the gas-dynamic behavior of the exhaust gases and consequently affect the vibration behavior of the exhaust gas column between the cylinder and the reflection chamber , These impairments can be largely avoided in a surprising manner, if between the exhaust gas outlet line and the exhaust pipe a flow guide in the exhaust pipe supporting partition wall is provided with passages through which the exhaust stream can flow out of the exhaust system via the catalytic converter.
  • the partition can be designed differently and used for example in the form of a grid, particularly favorable construction conditions arise when the wall of the exhaust pipe forms the partition, which must then be provided with corresponding passage openings.
  • Good mixing ratios can be ensured, in particular, by virtue of the passage openings in the dividing wall consisting of longitudinal slots running in the axial direction of the exhaust pipe or round holes arranged one behind the other in the axial direction of the exhaust pipe.
  • the stratification is additionally broken in the deflection of the exhaust stream.
  • the turbulent energy in the exhaust gas flow is increased, so that can be expected with a sufficiently high exhaust gas temperature for a good response of the catalytic converter.
  • the improved by the inventive partition wall between the Abgasieitung and the exhaust gas outlet line gas-dynamic behavior and the associated penetration into the charge cycle makes it useful to adjust the vibration behavior of the exhaust column between the reflection chamber and the cylinder to different engine loads.
  • the reflection chamber in its effective length depending on the engine speed, the engine load and / or the exhaust gas temperature can be made adjustable.
  • the requirement for a simple construction of such an adjustment requirement of a low exhaust gas temperature in the region of the reflection chamber is indeed fulfilled, but the hot exhaust gases are discharged through the exhaust gas outlet pipe in front of the closed end reflection chamber.
  • the z. B. can be wound in a worm shape or housed in frame parts of a vehicle.
  • the reflection chamber is provided in the region of its closed end with a closable by a check valve suction port for fresh air.
  • fresh air can be sucked into the reflection chamber via the suction opening, with the advantage that the reflection chamber with the upstream diffuser is flushed with fresh air, which counteracts the formation of condensate and makes deposits difficult.
  • the introduced fresh air causes additional cooling of the reflection chamber, wherein the fresh air is increasingly heated on its way to the exhaust gas outlet line and thus accordingly preheated mixed with the derived through the partition hot exhaust gas stream.
  • the illustrated exhaust system has an exhaust pipe 1 which can be flanged to an exhaust port of the cylinder of a two-stroke engine or a four-stroke engine and which is connected via an exhaust manifold to a diffuser 3 passing into a reflection chamber 2.
  • the partition wall 9 can be formed by the wall of the exhaust pipe 1, as in the embodiments of the FIGS. 2 and 3 is shown. But it is also possible to close the opening between the exhaust pipe 1 and the exhaust gas outlet line 5 with a grid, through which the exhaust gases are discharged to the exhaust catalyst 4.
  • the partition wall 9 has indeed the task to preserve the gas-dynamic behavior of the exhaust column in the exhaust pipe 1 between the cylinder and the end closed reflection chamber 2 against disturbing flow influences in the region of the connection of the exhaust gas outlet line 5 by the flow conditions in the wall region of the exhaust pipe 1 via the connection opening the exhaust gas outlet line 5 away as possible to be maintained. Despite the necessary passages 8 in the partition wall 9, this is achieved in a surprising manner, so that the gas-dynamic behavior of the exhaust column in the exhaust pipe 1 can be advantageously used for flushing and loading the cylinder.
  • the resonance behavior of the exhaust gas column in the exhaust gas line 1 can be adapted to different operating modes of the internal combustion engine.
  • the reflection chamber 2 with a suitable Stelltrieb be provided, which can be controlled in dependence on the engine speed, the engine load and / or the exhaust gas temperature.
  • the passage openings 8 are formed in the partition wall 9 between the exhaust pipe 1 and the exhaust gas outlet pipe 5 as longitudinal slots which extend in the axial direction of the exhaust pipe 1.
  • This alignment of the slot-shaped passage openings 8 brings a good mixing of the deflected into the exhaust gas outlet pipe 5 exhaust gas flow with it.
  • Due to the cyclical rinsing and gas exchange processes in the cylinder the exhaust gases flowing out of the cylinder into the exhaust gas line 1 have a stratification with different concentrations of the exhaust gas constituents, which imposes high requirements with regard to the storage capacity on the exhaust gas catalytic converter 4. With a uniform concentration of the exhaust components over the entire exhaust gas flow therefore advantageous conditions can be ensured for the operation of the catalytic converter 4.
  • a comparable mixing of the exhaust gas flow is also achieved with passage openings 8 in the partition wall 9, which are arranged according to the embodiment 3 in the axial direction of the exhaust pipe 1 extending rows.
  • fresh air can be supplied to the exhaust stream. Due to the pronounced gas-dynamic behavior of the exhaust gas column in the region of the exhaust pipe 1, this fresh air can be sucked in via the closed end of the reflection chamber 2, which for this purpose forms a suction opening 12 provided with a check valve 11. During the negative pressure phase, fresh air is thus sucked in via the check valve 11 into the reflection chamber 2 and gradually shifted to the exhaust gas outlet line 5 in order to be admixed with the exhaust gases discharged via the exhaust gas outlet line 5.
  • An advantage of such a fresh air supply to the exhaust gases is that the reflection chamber 2 is flushed with the aid of fresh air, which complicates the application of deposits in this area of the exhaust pipe 1.
  • the reflection chamber 2 is additionally cooled by the fresh air, whereby the temperature load of these parts of the exhaust system is further reduced.
  • the heat absorbed by the fresh air during the cooling of the reflection chamber 2 and of the diffuser 3 in turn prevents cooling of the exhaust gases, which is unfavorable for the catalyst operation, by the added fresh air, so that particularly advantageous conditions are established for the fresh air supply.
  • the exhaust gas outlet line 5 may have a replaceable portion 13 accommodating the exhaust gas catalyst 4.
  • This interchangeable section offers the possibility of preselecting the distance of the catalytic converter 4 from the connection of the exhaust gas outlet line 5 to the exhaust pipe 1 as a function of the particular internal combustion engine used to ensure advantageous temperature conditions due to the preselected distance for the operation and the response of the catalytic converter 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
  • Exhaust Gas After Treatment (AREA)
EP09450235A 2008-12-12 2009-12-14 Installation d'échappement pour un moteur à combustion interne Active EP2196641B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT0193208A AT507634B1 (de) 2008-12-12 2008-12-12 Auspuffanlage für eine verbrennungskraftmaschine

Publications (2)

Publication Number Publication Date
EP2196641A1 true EP2196641A1 (fr) 2010-06-16
EP2196641B1 EP2196641B1 (fr) 2012-01-04

Family

ID=41683321

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09450235A Active EP2196641B1 (fr) 2008-12-12 2009-12-14 Installation d'échappement pour un moteur à combustion interne

Country Status (2)

Country Link
EP (1) EP2196641B1 (fr)
AT (2) AT507634B1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3354874A1 (fr) * 2017-01-25 2018-08-01 BRP-Rotax GmbH & Co. KG Ensemble d'échappement, système d'échappement et moteur d'un véhicule
US11255248B2 (en) 2017-08-15 2022-02-22 Arctic Cat Inc. Snowmobile having a parallel-path exhaust system for two-stroke engine

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202011000535U1 (de) * 2011-03-09 2012-06-12 Makita Corporation Zweitaktmotor mit einem Schalldämpfer
US8844672B2 (en) 2011-03-09 2014-09-30 Makita Corporation Two-stroke engine comprising a muffler
CA3014123A1 (fr) 2017-08-15 2019-02-15 Arctic Cat Inc. Systeme d'huile sous pression alimente par un moteur deux-temps

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2138510A (en) * 1930-02-10 1938-11-29 Carl F Rauen Muffler
US2739661A (en) * 1952-07-25 1956-03-27 Walker Mfg Company Of Wisconsi Muffler
US4449608A (en) * 1980-10-20 1984-05-22 Kawasaki Jukogyo Kabushiki Kaisha Exhaust device for 2-cycle engine
JPS60142009A (ja) * 1983-12-28 1985-07-27 Ishikawajima Shibaura Kikai Kk ２サイクルエンジンの排気装置
AT404391B (de) 1989-11-10 1998-11-25 Pischinger Rudolf Dipl Ing Dr Auspuffanlage für eine zweitakt-brennkraftmaschine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2138510A (en) * 1930-02-10 1938-11-29 Carl F Rauen Muffler
US2739661A (en) * 1952-07-25 1956-03-27 Walker Mfg Company Of Wisconsi Muffler
US4449608A (en) * 1980-10-20 1984-05-22 Kawasaki Jukogyo Kabushiki Kaisha Exhaust device for 2-cycle engine
JPS60142009A (ja) * 1983-12-28 1985-07-27 Ishikawajima Shibaura Kikai Kk ２サイクルエンジンの排気装置
AT404391B (de) 1989-11-10 1998-11-25 Pischinger Rudolf Dipl Ing Dr Auspuffanlage für eine zweitakt-brennkraftmaschine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3354874A1 (fr) * 2017-01-25 2018-08-01 BRP-Rotax GmbH & Co. KG Ensemble d'échappement, système d'échappement et moteur d'un véhicule
US20180215446A1 (en) * 2017-01-25 2018-08-02 Brp-Rotax Gmbh & Co. Kg Exhaust assembly, exhaust system, and power pack for a vehicle
US10800490B2 (en) * 2017-01-25 2020-10-13 Brp-Rotax Gmbh & Co. Kg Exhaust assembly, exhaust system, and power pack for a vehicle
US11255248B2 (en) 2017-08-15 2022-02-22 Arctic Cat Inc. Snowmobile having a parallel-path exhaust system for two-stroke engine

Also Published As

Publication number Publication date
ATE540202T1 (de) 2012-01-15
AT507634B1 (de) 2011-01-15
EP2196641B1 (fr) 2012-01-04
AT507634A1 (de) 2010-06-15

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