EP0279710A1 - Auspuffanlage für einen Sechszylinder-V-Motor - Google Patents

Auspuffanlage für einen Sechszylinder-V-Motor Download PDF

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Publication number
EP0279710A1
EP0279710A1 EP88400042A EP88400042A EP0279710A1 EP 0279710 A1 EP0279710 A1 EP 0279710A1 EP 88400042 A EP88400042 A EP 88400042A EP 88400042 A EP88400042 A EP 88400042A EP 0279710 A1 EP0279710 A1 EP 0279710A1
Authority
EP
European Patent Office
Prior art keywords
branch
exhaust
branches
engine
pipe
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
EP88400042A
Other languages
English (en)
French (fr)
Other versions
EP0279710B1 (de
Inventor
Jean Gratadour
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.)
Automobiles Peugeot SA
Automobiles Citroen SA
Original Assignee
Automobiles Peugeot SA
Automobiles Citroen SA
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 Automobiles Peugeot SA, Automobiles Citroen SA filed Critical Automobiles Peugeot SA
Publication of EP0279710A1 publication Critical patent/EP0279710A1/de
Application granted granted Critical
Publication of EP0279710B1 publication Critical patent/EP0279710B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • 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
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
    • F02B75/18—Multi-cylinder engines
    • F02B75/22—Multi-cylinder engines with cylinders in V, fan, or star arrangement

Definitions

  • the invention relates to an exhaust device of a six-cylinder V-shaped engine arranged transversely at the front of a motor vehicle.
  • V6 engines that is to say engines comprising six cylinders in a V arrangement
  • these six cylinders are distributed in two rows of three cylinders, one of which is disposed at the front, with respect to the second row or back row.
  • the exhaust device of such a transverse V6 engine comprises a front branch constituted by a pipe connected to the pipes or to the exhaust manifold of the three cylinders of the front row and a rear branch formed by a pipe connected to the pipes or to the manifold. exhaust from the three rear row cylinders.
  • the front branch must pass under the engine either to be joined to the rear branch and constitute a single branch, or to travel over a certain length in parallel with the rear branch before constituting a single branch.
  • the front and rear branches and the single branch ensuring their junction are directed in the longitudinal direction of the vehicle and towards the rear and the single branch is connected to the exhaust line of the vehicle.
  • the front branch of the exhaust therefore has a length greater than the rear branch, which causes certain drawbacks with regard to the attenuation of certain harmonics of the acoustic excitation of the exhaust.
  • the acoustic excitation in the two branches has the same amplitude and the operation of the V6 engine is such that, for certain harmonics, the acoustic waves are in phase opposition in the two front and rear branches, so that the acoustic excitation is canceled at the entry of the single branch ensuring the junction of the front and rear branches.
  • the level of the 1.5 N harmonic becomes very high when the difference in length between the front and rear conduits exceeds 400 mm. Generally, this difference in length is close to 500mm in the usual arrangements of transverse V6 engines.
  • the object of the invention is therefore to propose an exhaust device for a six-cylinder V-shaped engine arranged transversely at the front of a motor vehicle, comprising a front branch which collects the gases from a first row of three cylinders located towards the front and a rear branch which collects the gases of a second row of three cylinders situated towards the rear with respect to the first row, the front and rear branches being constituted by pipes which join at their opposite end to the engine, in a single branch which is connected to the exhaust pipe of the vehicle, this exhaust device making it possible to attenuate the low frequency harmonics of the acoustic excitation of the exhaust and in particular the harmonic of frequency 1.5 N, without requiring, inside the engine compartment, a special arrangement of the pipes of the front and rear branches.
  • the front and rear branches of the exhaust have lengths which differ by at least 400 mm and the single branch is in communication with the input of a device to inter ferences located outside the engine compartment in the exhaust line and comprising at least two branches which constitute by their union a branch at the entry of the interference device and a branch at the outlet and which produce a separation of the gas flow d in at least two streams and a phase shift of the low frequency acoustic waves flowing in one of the branches relative to the waves flowing in the other branch, so that the waves corresponding to the 1.5 N harmonic are attenuated by interference at the output of the interference device.
  • FIG 1 we see a V6 engine placed transversely in the engine compartment of a vehicle occupying its front part.
  • This engine 1 comprises a front row 1a and a rear row 1b each comprising three cylinders, the cylinders of row 1a being arranged angularly and in this specific case at 90 ° relative to the cylinders of row 1b.
  • the three cylinders in row 1a have a common exhaust manifold 2a and the three cylinders in the rear row 1b, a common exhaust manifold 2b.
  • the engine exhaust device 1 comprises, inside the engine compartment, a front branch 3a connected to the manifold 2a and a rear branch 3b connected to the manifold 2b.
  • the branch 3a must pass under the engine 1 to join the branch 3b, at the rear of the engine, these two branches being directed in parallel towards the rear of the motor (arrows 4).
  • the length of the front leg 3a of the exhaust is much greater than the length of the branch 3b, these lengths respectively Li and L 2 corresponding for one to the length of the piping between the manifold 2a and the junction point 8 and, for the other, the length of the piping between the manifold 2b and the junction point 8.
  • the difference L i - L 2 is much greater than the limit from which the level of the 1.5 N harmonic becomes very high.
  • the interference device 12 comprises two branches 14 and 15 connected to the single branch 10 of the exhaust at a branch 16.
  • the two branches 14 and 15 meet at a junction point 18 upstream of the exhaust pipe 11 of the vehicle.
  • the branch 14 is constituted by a single pipe.
  • the branch 15 is constituted by the succession of a pipe 19, of a capacity 20 constituting a transverse silencer and of a second pipe 21.
  • the first pipe 19 makes it possible to join the branch 16 into which the single branch 10 opens, to the muffler 20.
  • the pipe 21 makes it possible to join the muffler 20 to the branch 18 upstream of the exhaust pipe 11.
  • This device 12 achieves on the one hand the separation of the gas flow originating from the single branch 10 into two flows circulating respectively in the branch 14 and in the branch 15.
  • This device 12 also constitutes an attenuator for the low frequency harmonics of the acoustic excitation in the exhaust device, the branch 15 constituting a phase shifter and the branch 14 ensuring only a small phase shift.
  • the silencer 20 is placed at a distance d1 from the branch 16 which corresponds substantially to the length of the pipe 19 of the branch 15 and at a distance d2 from the outlet branch 18 of the interference device which corresponds substantially to the length of piping 21.
  • the piping 14 has a long length corresponding to the length d1 + d2.
  • a device such as the device 12 constitutes a very energetic attenuator in a certain range of low frequencies and in particular for the harmonic of frequency 1.5 N of the motor.
  • a person skilled in the art knows how to determine the lengths of the branches 14 and 15, the lengths d1 and d2, the volume 20 and the diameters of the pipes of the branches 14 and 15 so that the acoustic flows at the outlet of the device 12 cancel each other out and that the gas flow can pass with a minimum pressure drop.
  • FIG 2 there is shown schematically a branch which may constitute the outlet branch of an interference device.
  • This branch comprises a first branch 22, a second branch 23 and a output branch 24.
  • dl , d2 and s be the Fresnel vectors representing, for the harmonic considered, the flows leaving the branches 22 and 23 and entering the output branch 24.
  • An interference device therefore assumes the existence of two branches between which a flow is separated to obtain two gaseous and acoustic flows which are then combined, at the outlet of branches of the interference device.
  • the presence of the silencer 20 and the arrangement of the pipes ensure a phase shift greater than ⁇ from a certain frequency f0.
  • the section and the length of the first branch 14 are chosen so that the acoustic flows leaving the two branches 14 and 15 are substantially equal in amplitude for a frequency f slightly greater than f0.
  • the branch 14 produces only a small phase shift.
  • the interference effect is maximum for the frequency f and extends over a certain frequency range around f.
  • the device is designed so that the frequency f corresponds to 1.5 N, N corresponding to the normal engine speed.
  • FIGS. 4a, 4b and 4c there are shown three types of interference devices capable of being used for the attenuation of the low frequency components, in the vicinity of the 1.5 N harmonic, in an exhaust device d 'a transverse V6 engine as shown in Figure 3.
  • the interference device comprises a first branch 24 which is a simple pipe and a second branch 25a, 25b or 25c on which is inserted a silencer 26a, 26b and 26c, respectively.
  • the silencer 26a is a simple cavity into which the end portions of an inlet pipe 27 and an outlet pipe 28 penetrate.
  • the silencer 26b is a capacity transversed by a pipe 29 comprising, in its part passing through the capacity 26b, orifices 30 carefully calibrated and arranged along the length and the circumference of the pipe 29.
  • the silencer 26c is a capacity shared in two chambers 26e and 26f by means of a wall 26d into which the ends of an inlet pipe 31 and an outlet pipe 32 respectively emerge and which are connected by an intermediate pipe 33.
  • the lengths of the branches 24 and 25 are large enough to allow the processing of acoustic waves at low frequency, that is to say having large wavelengths.
  • phase shift introduced by the asymmetry of the two branches of the device 12 must take a sufficient value so that an interference phenomenon is obtained which makes it possible to attenuate the 1.5 N harmonic, N corresponding to the normal regime of the engine in revolutions per minute.
  • the entire interference device will always be placed outside the engine compartment and associated with a part of the vehicle in which the space requirement of the interference device is not a critical element. .
  • the implementation of the invention supposes the separation of the flow of exhaust gases into at least two gas and acoustic flows, a different treatment of the two gas and acoustic flows in long branches introducing a phase shift of the low frequency waves. and a meeting of the two streams at a time when the phase shifts and amplitudes for the frequencies considered allow significant attenuation.
  • FIGS. 5A and 5B show two types of interference devices known for their use in attenuating the high frequencies corresponding to short wavelengths. These devices use short piping lengths and do not make it possible to produce a significant phase shift of the acoustic waves in both branches, for low frequencies, that is to say long wavelengths .
  • the interference device is preferably arranged just upstream of the vehicle exhaust but it is also possible to move this device more or less by using a connecting pipe of varying length.
  • the piping joining the interference device to the front and rear branches of the exhaust may itself have a variable length, depending on the characteristics of the front and rear branches of the exhaust and the interference device.
  • the front and rear branches can include devices such as catalysts which do not change anything with regard to the problem of the 1.5 N harmonic and its resolution by the device according to the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
EP19880400042 1987-02-12 1988-01-08 Auspuffanlage für einen Sechszylinder-V-Motor Expired - Lifetime EP0279710B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8701781A FR2610988B1 (fr) 1987-02-12 1987-02-12 Dispositif d'echappement d'un moteur a six cylindres en v
FR8701781 1987-02-12

Publications (2)

Publication Number Publication Date
EP0279710A1 true EP0279710A1 (de) 1988-08-24
EP0279710B1 EP0279710B1 (de) 1990-04-18

Family

ID=9347855

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880400042 Expired - Lifetime EP0279710B1 (de) 1987-02-12 1988-01-08 Auspuffanlage für einen Sechszylinder-V-Motor

Country Status (3)

Country Link
EP (1) EP0279710B1 (de)
DE (1) DE3860091D1 (de)
FR (1) FR2610988B1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5195607A (en) * 1989-11-21 1993-03-23 Mazda Motor Corporation Exhaust system for automotive engine
EP0540891A1 (de) * 1991-11-02 1993-05-12 Dr.Ing.h.c. F. Porsche Aktiengesellschaft Abgasanlage eines Kraftfahrzeug-Hubkolbenmotors
US5445241A (en) * 1991-03-25 1995-08-29 Mazda Motor Corporation Exhaust gas pipe assembly for an automotive engine
FR2855212A1 (fr) * 2003-05-23 2004-11-26 Renault Sa Dispositif d'echappement pour moteur a combustion interne et moteur ainsi equipe
WO2009031015A2 (en) * 2007-09-06 2009-03-12 Toyota Jidosha Kabushiki Kaisha Exhaust device for vehicle internal combustion engine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11549414B1 (en) * 2019-11-07 2023-01-10 Phillip M. Adams Sound attenuator apparatus and method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2849858A (en) * 1954-09-29 1958-09-02 Gen Motors Corp Exhaust system for engines
US3580357A (en) * 1970-05-22 1971-05-25 Gen Motors Corp Wave interference silencing system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60243317A (ja) * 1984-05-18 1985-12-03 Sankei Giken Kogyo Kk 内燃機関の排気管

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2849858A (en) * 1954-09-29 1958-09-02 Gen Motors Corp Exhaust system for engines
US3580357A (en) * 1970-05-22 1971-05-25 Gen Motors Corp Wave interference silencing system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 10, no. 114 (M-473)[2171], 26 avril 1986; & JP-A-60 243 317 (SANKEI GIKEN KOGYO K.K.) 03-12-1985 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5195607A (en) * 1989-11-21 1993-03-23 Mazda Motor Corporation Exhaust system for automotive engine
US5445241A (en) * 1991-03-25 1995-08-29 Mazda Motor Corporation Exhaust gas pipe assembly for an automotive engine
EP0540891A1 (de) * 1991-11-02 1993-05-12 Dr.Ing.h.c. F. Porsche Aktiengesellschaft Abgasanlage eines Kraftfahrzeug-Hubkolbenmotors
FR2855212A1 (fr) * 2003-05-23 2004-11-26 Renault Sa Dispositif d'echappement pour moteur a combustion interne et moteur ainsi equipe
WO2009031015A2 (en) * 2007-09-06 2009-03-12 Toyota Jidosha Kabushiki Kaisha Exhaust device for vehicle internal combustion engine
WO2009031015A3 (en) * 2007-09-06 2009-06-18 Toyota Motor Co Ltd Exhaust device for vehicle internal combustion engine
US8434588B2 (en) 2007-09-06 2013-05-07 Toyota Jidosha Kabushiki Kaisha Exhaust device for vehicle internal combustion engine

Also Published As

Publication number Publication date
FR2610988A1 (fr) 1988-08-19
FR2610988B1 (fr) 1989-06-23
DE3860091D1 (de) 1990-05-23
EP0279710B1 (de) 1990-04-18

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