WO1996011331A1 - Systeme d'echappement - Google Patents

Systeme d'echappement Download PDF

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Publication number
WO1996011331A1
WO1996011331A1 PCT/NL1995/000342 NL9500342W WO9611331A1 WO 1996011331 A1 WO1996011331 A1 WO 1996011331A1 NL 9500342 W NL9500342 W NL 9500342W WO 9611331 A1 WO9611331 A1 WO 9611331A1
Authority
WO
WIPO (PCT)
Prior art keywords
air
auxiliary device
discharge
control unit
engine
Prior art date
Application number
PCT/NL1995/000342
Other languages
English (en)
Inventor
Bernard Hendrik Schel
Original Assignee
Bsm Exhaust Systems
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 Bsm Exhaust Systems filed Critical Bsm Exhaust Systems
Priority to AU37109/95A priority Critical patent/AU3710995A/en
Publication of WO1996011331A1 publication Critical patent/WO1996011331A1/fr

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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
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/22—Control of additional air supply only, e.g. using by-passes or variable air pump drives

Definitions

  • a lambda probe as measuring element in the exhaust of a combustion engine with fuel injection is known.
  • the control signal coming from the lambda probe is used by a central electronic control unit to always provide the ignition and injection systems of the engine with an optimal amount of fuel in relation to the con ⁇ sumption and composition of the exhaust gases.
  • the invention provides an auxiliary device intended for addition to a combustion engine with at least one carburettor, for example a motorcycle engine, which engine comprises: an engine block with at least one cylinder, into which a mixture of fuel and air is supplied via one or the carburettor; and a discharge pipe added to the or each cylinder for discharging combustion gases, to which discharge pipe or converging discharge pipes connects an outlet which comprises in the flow direction: an inlet pipe, a cata ⁇ lytic converter, a silencer and a discharge tail pipe; which auxiliary device comprises: a lambda probe for placing in the inlet; an air feed conduit for connecting to the or each discharge pipe; an air supply device with an air inlet, an air discharge connected to the or each air feed conduit and an air flow rate adjustment unit which is connected between the air inlet and the air discharge and is adjustable by means of an adjusting signal supplied via an input connection; and an electronic control unit, of which an input is connected to the lambda probe and the output is connected to the input connection of the air
  • the control takes place such that, if the air- fuel mixture is too rich, the air supply device will supply air to the discharge pipe or pipes, which form the intake zone of the exhaust. Due to this supply of extra air the value of lambda will be adjusted back to the value "1". In general the air supply device will admit more or less air into the exhaust system, depending on whether the mixture is rich or less rich.
  • the lambda probe which is placed in the transition zone between the discharge pipe and the catalytic converter, generates a signal corresponding therewith.
  • the electronic control unit is the active component in the hereby created control circuit.
  • a comparison between the known injection engine with lambda control and an engine with an auxiliary device according to the invention shows that the known system optimizes the amount of fuel in advance, while the auxiliary device according to the invention is adapted to adjust afterwards the amount of extra air supplied to the exhaust system.
  • the air supply system can be based on allowing through more or less of an air flow created by suction.
  • the auxiliary device according to the invention can display the feature that the air flow rate adjustment comprises a valve with adjustable passage.
  • the air flow rate adjustment unit is preferably embodied such that the air flow is not turbulent or only slightly so.
  • the auxiliary device can have the characteristic that the valve is a butterfly valve controlled by an actuator, for example a stepping motor.
  • an actuator for example a stepping motor.
  • use is made of actively generating an air flow.
  • Such an embodiment can have the feature that a fan is arranged between the air inlet and the or each air discharge. It will be apparent that such an embodiment can be combined with a valve with adjustable passage.
  • a valve with adjustable passage can be omitted. Air is effectively prevented from flowing back with an embodiment which has the feature that a non ⁇ return valve is arranged between the air inlet and the or each air discharge.
  • the auxiliary device can have the feature that the electronic con ⁇ trol unit comprises a second input to receive a vacuum signal coming from the engine such that the flow of the air generated by the air supply device is set at zero when the fuel supply is deactivated.
  • a preferred embodiment has the feature that the electronic control unit is programmable.
  • the electronic control unit is an intelligent type.
  • the embodiment can particularly be such that the electronic control unit is programmable on the basis of "fuzzy logic".
  • fuzzy logic Such an algorithm gives a considerably improved flexibility.
  • the algorithm defines a number of operating situations, wherein the manner in which the control must respond in these operating situations is also determined.
  • the rule can be incorporated for instance that when the average lambda value indicates that the mixture is too rich, while the current lambda value gives the same indication, the flow rate of the extra air flow must increase rapidly, for example by opening the valve to the maximum or causing an optional fan to rotate at full power in order to supplement the deficit of air.
  • the amount of air is already slightly reduced, for instance by turning the butterfly valve through a pre-selected angle, so that for example 7/8 of the total passage remains available, hereby anticipating an overshoot.
  • a number of rules are thus formulated, wherein the microprocessor forming part of the electronic control unit determines in each case which of the rules is appli ⁇ cable. This rule then determines which adjusting signal is sent to the air supply device.
  • the auxiliary device according to the invention is preferably characterized by a housing in which the air supply device and the electronic control unit are ar ⁇ ranged.
  • This embodiment has a number of advantages. There is a reduced danger of electronic malfunction because the electronic unit is arranged in an environment which is not susceptible to malfunction. There are fewer external electrical connections.
  • the system according to the invention comprises fewer individual components, i.e. the integrated auxiliary device with electronics, the lambda sensor and a vacuum switch. Finally, it may be stated that the integrated unit has a more attractive appear- ance.
  • Figure 1 shows a graphic view of the activity of a commercially available lambda probe
  • Figure 2 shows a schematic view of an engine with an auxiliary device according to the invention
  • FIG. 2 shows schematically the combination of a combustion engine 1 with an auxiliary device according to the invention.
  • the engine 1 is of the type with four cylinders. These receive combustible mixture from a carburettor 3 via an inlet manifold 2.
  • An air feed is designated schematically with the reference numeral 4, while the fuel supply is designated with the reference numeral 5.
  • An arrow 6 indicates schematically that the user of the engine 1 can adjust the activity of the engine by means of a throttle or accelerator pedal.
  • a discharge pipe 7 for the combustion gases is added to each cylinder. These discharge pipes come together in the intake zone of an exhaust.
  • This comprises an inlet pipe 8 which transports the combustion gases further to a three-way catalytic converter 9, from where the combustion gases are further transported through a silencer 10 to a discharge tail pipe 11 to be discharged.
  • the inlet pipe 8 carries a lambda probe 12 the active part 13 of which protrudes into the interior of the inlet pipe 8 so that it can measure the oxygen ions in the combustion gases flowing past.
  • the lambda probe generates a lambda signal via a line 14 to an electronic control unit 15. Via a line 16 this electronic control unit 15 also receives a vacuum signal which comes from a vacuum switch (not drawn) present in engine l.
  • the unit 15 controls an electrically adjustable air supply device 17 via a line 18.
  • the device 17 receives ambient air 19 which is filtered through an air filter 20 and, in a manner to be described below and under the control of the control unit 15, is passed to a greater or lesser degree to four air feed conduits 21 which receive air at a determined flow rate from the device 17 via air discharges 22.
  • the pipes 21 debouch into the respective discharge pipes 7.
  • the air flowing through pipes 21 is added to the combustion gases which flow through these discharge pipes 7.
  • the auxiliary device 13, 12, 14, 15, 18, 17, 22, 21 forms with the exhaust 7, 8, 10, 11 connected to the available engine 1 a closed control circuit.
  • the electronic control unit is programmed such that it continuously controls the air supply device such that the lambda value measured by the lambda probe 12 is continuously maintained at the nominal value "1".
  • the three-way catalytic converter 9 can function optimally in the manner shown in figure 1 in order to break down the share of NO, HC and CO in the gases sup ⁇ plied to the catalytic converter 9.
  • the vacuum signal supplied to the control unit 15 via the line 16 is generated in the case the fuel control 6 is released by a user. This effectively prevents explo ⁇ sions in the exhaust system.
  • the electronic control unit 15 comprises a microprocessor which is programmed on the basis of fuzzy logic.
  • FIG. 3 shows the structure of the air supply device 17.
  • This comprises a housing 23, the wall of which drawn on the underside comprises the air filter 20.
  • the air allowed therethrough is admitted via pipes 24 into respective non-return valves 25.
  • These each comprise plates 28 which are mutually loaded by a draw spring 26 and pivotable around centre lines 27 and which in the position shown here co-act substantially sealingly with side elements 29. Through-flowing air can press the plates 28 aside as according to arrows 30, whereby the non-return valve 25 opens. Under the influence of the draw spring 26 the plates 28 are urged back to their rest position shown in figure 3.
  • the non-return valves 25 also close in the case of a pressure pulse supplied to the device 17 via the air discharges 22. This prevents the combustion gases coming from discharge pipes 7 flowing through the device 17 in the direction opposite to the nominal direction.
  • an adjustment plate 33 is ar ⁇ ranged between two partitions 31, 32. This is supported by the output shaft 34 of a stepping motor 35 which is controlled by the electronic control unit 15 accommodated in the housing 23. This stepping motor determines the angular position of the adjustment plate 33 and thereby the effective passage of the device 17.
  • Throttle plates 37 adjustable by means of external operating means 36 are arranged in the pipes 24. A rough pre-adjustment of the effective passage can take place herewith.
  • Figure 4 shows the effectiveness of the auxiliary device according to the invention.
  • This figure shows a graph in which the number of grammes of emission per kilometre for a particular type of motorcycle is set out vertically, while a comparison per component, CO, HC, NO ⁇ , HC + N0 ⁇ respectively is made between a standard engine without catalytic converter and auxiliary device, an engine with catalytic converter 200, an engine with catalytic converter 200 and an auxiliary device according to the invention and an engine with catalytic converter 400 and an auxiliary device according to the invention. It will be apparent from this comparison that the auxil- iary device according to the invention makes a very good contribution to cleaning combustion gases prior to emis ⁇ sion.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

Dispositif auxiliaire destiné à s'ajouter à un moteur à combustion équipé d'au moins un carburateur, par exemple à un moteur de motocyclette. Ce moteur comporte un bloc moteur possédant au moins un cylindre alimenté en un mélange de carburant et d'air par l'intermédiaire du ou des carburateur(s); et un tuyau d'évacuation ajouté au(x) cylindre(s) afin d'évacuer les gaz de la combustion, le ou lesdits tuyau(x) d'évacuation (convergents) étant relié(s) à un passage de sortie comportant, dans le sens de l'écoulement, un tuyau d'entrée, un convertisseur catalytique, un silencieux et un tuyau arrière d'échappement. Ledit dispositif auxiliaire comporte une sonde lambda placée dans le passage d'entrée; une conduite d'amenée d'air reliée au(x) tuyau(x) d'évacuation; un dispositif d'alimentation en air muni d'un passage d'entrée d'air, d'un passage d'évacuation d'air relié à la ou les conduite(s) d'amenée d'air, et une unité de régulation du débit d'air intercalée entre le passage d'entrée d'air et le passage d'évacuation d'air, et réglée au moyen d'un signal de réglage injecté par l'intermédiaire d'une connexion d'entrée; et une unité de commande électronique dont une borne d'entrée est raccordée à la sonde lambda tandis que sa borne de sortie est reliée au raccord d'entrée du dispositif d'alimentation en air; cette unité de commande étant adaptée pour commander le dispositif d'alimentation en air de telle sorte que la valeur lambda demeure sensiblement égale à la valeur '1'.
PCT/NL1995/000342 1994-10-06 1995-10-06 Systeme d'echappement WO1996011331A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU37109/95A AU3710995A (en) 1994-10-06 1995-10-06 Exhaust system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL9401647 1994-10-06
NL9401647A NL9401647A (nl) 1994-10-06 1994-10-06 Uitlaatsysteem.

Publications (1)

Publication Number Publication Date
WO1996011331A1 true WO1996011331A1 (fr) 1996-04-18

Family

ID=19864743

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL1995/000342 WO1996011331A1 (fr) 1994-10-06 1995-10-06 Systeme d'echappement

Country Status (3)

Country Link
AU (1) AU3710995A (fr)
NL (1) NL9401647A (fr)
WO (1) WO1996011331A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0994245A2 (fr) * 1998-10-15 2000-04-19 Audi Ag Procédé et appareil pour la réduction de la charge des composants de système d'échappement des moteurs à combustion interne

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3643640A (en) * 1970-02-12 1972-02-22 Exxon Research Engineering Co Low-polluting internal combustion engine wherein exhaust gases are recycled in a controlled pattern
US4383408A (en) * 1979-08-17 1983-05-17 Toyota Jidosha Kogyo Kabushiki Kaisha Exhaust gas purifying method of an internal combustion engine
FR2696209A1 (fr) * 1992-09-25 1994-04-01 Renault Procédé et dispositif d'injection de gaz additionnels pour moteur à combustion interne.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3643640A (en) * 1970-02-12 1972-02-22 Exxon Research Engineering Co Low-polluting internal combustion engine wherein exhaust gases are recycled in a controlled pattern
US4383408A (en) * 1979-08-17 1983-05-17 Toyota Jidosha Kogyo Kabushiki Kaisha Exhaust gas purifying method of an internal combustion engine
FR2696209A1 (fr) * 1992-09-25 1994-04-01 Renault Procédé et dispositif d'injection de gaz additionnels pour moteur à combustion interne.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0994245A2 (fr) * 1998-10-15 2000-04-19 Audi Ag Procédé et appareil pour la réduction de la charge des composants de système d'échappement des moteurs à combustion interne
EP0994245A3 (fr) * 1998-10-15 2002-12-04 Audi Ag Procédé et appareil pour la réduction de la charge des composants de système d'échappement des moteurs à combustion interne

Also Published As

Publication number Publication date
AU3710995A (en) 1996-05-02
NL9401647A (nl) 1996-05-01

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