EP0231828A1 - Procédé et dispositif de régénération d'un filtre à suie pour moteurs diesel - Google Patents

Procédé et dispositif de régénération d'un filtre à suie pour moteurs diesel Download PDF

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Publication number
EP0231828A1
EP0231828A1 EP87100911A EP87100911A EP0231828A1 EP 0231828 A1 EP0231828 A1 EP 0231828A1 EP 87100911 A EP87100911 A EP 87100911A EP 87100911 A EP87100911 A EP 87100911A EP 0231828 A1 EP0231828 A1 EP 0231828A1
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EP
European Patent Office
Prior art keywords
diesel
soot filter
pressure
outlet channel
outlet
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
EP87100911A
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German (de)
English (en)
Other versions
EP0231828B1 (fr
Inventor
Konstantin N. Prof.Dr.-Ing. Pattas
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Individual
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Individual
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Publication date
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Publication of EP0231828A1 publication Critical patent/EP0231828A1/fr
Application granted granted Critical
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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
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/0235—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using exhaust gas throttling means
    • 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
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • 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
    • F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
    • F01N2430/06—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics by varying fuel-air ratio, e.g. by enriching fuel-air mixture
    • 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
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition

Definitions

  • the invention relates to a method and a device for the regeneration of a diesel soot filter which is installed in the outlet duct of a diesel engine, the exhaust gas in that section of the outlet duct which contains the diesel soot filter being compressed by controlled throttling of the outlet duct to such an extent that the Regeneration temperature limit is reached or exceeded.
  • Diesel soot filters with a porous wall, in particular made of a monolithic ceramic material, have been developed for filtering the solids, such as soot, contained in the exhaust gas of a diesel engine.
  • the soot separated in the diesel soot filter is ignited and burned in the presence of residual oxygen contained in the exhaust gas. This regenerates the diesel soot filter.
  • the engine When driving around town (e.g. European driving cycle ECE-15) of diesel cars, trucks or buses, the engine is mainly operated in the partial load range.
  • the temperature in the outlet channel remains below the regeneration temperature limit, so that the deposited soot is not burned and the diesel soot filter is not regenerated.
  • a burner has been installed in the outlet channel in front of the soot filter to regenerate the soot filter. Sufficiently high temperatures are reached with a burner; however, the temperatures become so high that the diesel particulate filter can easily be damaged or destroyed. In addition, such burners have to work against the pressure in the outlet channel, which has not yet been satisfactorily resolved.
  • the invention has for its object to provide a method and an apparatus which enables a timely and sufficient regeneration of the soot filter without the risk of its premature destruction due to local melting of the filter material.
  • a method of the type described in the introduction according to the invention provides that the amount of fuel metered to the diesel engine is reduced during throttling.
  • the amount of fuel is preferably controlled reduced depending on the pressure in the outlet channel. With increasing pressure in the exhaust port due to the throttling, correspondingly less fuel is metered in, so that the risk of excessive soot formation when the engine is operating at full load is avoided.
  • a sufficient and regular regeneration of the soot filter can be achieved by increasing the pressure in the outlet channel. It is particularly advantageous if the throttling is controlled automatically as a function of the pressure in the outlet channel, in particular upstream from the diesel soot filter, because when the exhaust gas flow is throttled before the diesel soot filter, it is in the range of lower pressure and therefore less stress during operation.
  • a device for the regeneration of a diesel soot filter which is installed in the outlet channel of a diesel engine, a throttle device being installed in the outlet channel, is characterized according to the invention by a control device for influencing the amount of fuel metered to the engine during operation of the throttle device.
  • control device comprises a movable wall which can be acted upon by the pressure in the outlet line and which is coupled to a control rod of a fuel injection pump, the movable wall expediently on one side from the pressure in the outlet line and on the other side is acted upon by a prestressed compression spring.
  • the throttle device itself preferably has a valve with a valve opening which can be controlled by a valve closing body and with an actuating membrane which is acted upon by the pressure in the outlet line and which is connected to the valve closing body and acts on the low pressure side against a compression spring.
  • the throttling can be controlled manually or automatically depending on the pressure drop in the diesel particulate filter.
  • the throttling can be switched off in both cases by fully pressing the accelerator pedal ("kick-down"), so that the full power of the diesel engine is available if required.
  • the throttle device can also be formed by a throttle valve which has a control bore.
  • the exhaust gas is compressed automatically or at selected times in the section of the exhaust duct which contains the diesel soot filter.
  • temperature and pressure are increased to such an extent in this section that ignition and combustion of the soot deposited in the diesel soot filter or of the solids in the exhaust gas takes place with certainty.
  • overloading of the soot filter is avoided when the machine is operating at full load with the outlet duct throttled.
  • the desired regeneration under all operating conditions of the diesel engine i.e. H. always ensured, even when idling and at partial load.
  • the invention allows the regeneration of the diesel soot filter to be carried out in selectable time periods which are only a fraction, e.g. B. 1/100 of the total operating time of the engine. This impairment of M otor compassiones itself can turn practically regeneration.
  • the regeneration of the diesel soot filter can take place, for example, when the vehicle is idling or when a stationary diesel engine is idling or when the diesel engine is in motion or under load. It is possible, by appropriate D of the throttle device imenions réelle the full power of the engine for regenerating the soot filter Diesel provide also at zero load.
  • the exhaust gas temperature that can be achieved in this way exceeds the lower limit of the regeneration temperature range. The lower this lower limit is, the faster the desired regeneration is achieved.
  • an injection pump 12 belongs to a diesel engine 11.
  • a soot filter 10 is switched on in the outlet duct 13 for the exhaust gases of the diesel engine 11.
  • a throttle device 14 is installed in the outlet channel in order to raise the pressure in the outlet channel upstream of the soot filter 10 to a value at which the soot separated in the soot filter 10 ignites and burns.
  • the injection pump 12 is associated with a control device 16, which has a movable wall or membrane 15, which on one side of the pressure in the outlet channel 13 between the diesel engine 11 and throttle device 14 and on the other side of a prestressed compression spring 18 with a defined, z . B. is applied to progressive spring behavior.
  • the membrane is connected in the middle to a control rod 19, which controls the full-load stop in the injection pump 12.
  • an enlargement of the operating range under the torque curve 30 in comparison to FIG. 2 can also be achieved if the control device 16 is not acted upon by the pressure in the outlet channel 13 but rather the metered fuel quantity when the throttle device 14 takes effect by a predetermined amount, e.g. B. a constant amount is reduced.
  • a predetermined amount e.g. B. a constant amount is reduced.
  • optimal conditions result when the diaphragm 15 of the control device 16 is acted upon by the pressure in the outlet channel 13 via the return line 17 according to FIG.
  • the throttle device 14 comprises a valve with a valve closing body 35 on a valve rod 36 which passes through a valve opening 37 in a partition 38 in the outlet channel 13.
  • the section downstream of the partition 38 the outlet duct is designated by reference numeral 13 '.
  • the valve rod 36 is connected to a membrane 40 which is acted upon on its upper side by the pressure in the upstream section of the outlet channel 13 via a line 41, while a prestressed compression spring 42 acts on the other side of the membrane 40.
  • the valve closing body 35 With increasing pressure in the outlet channel 13, the valve closing body 35 thus opens the valve opening 37, thus weakening the throttling action of the throttle device 14.
  • a modified throttle device is shown in FIG. 5.
  • a throttle valve 45 with a control bore 47 is arranged in the outlet channel 13.
  • a bypass line 48 connects the sections of the outlet channel 13 upstream and downstream of the throttle valve 45.
  • this bypass line is a valve turned on, the principle how the valve in F ig. 4 is constructed, but is operated in the opposite direction.
  • the parts of this valve are designated by the same reference numerals as in Fig. 4. With increasing pressure in the section of the outlet duct 13 upstream of the throttle valve 45, this valve also opens.
  • the throttle device 14 can also be arranged downstream of the soot filter 10 in the outlet channel 13, the soot filter 10 then being exposed to a higher pressure.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Processes For Solid Components From Exhaust (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
EP87100911A 1986-01-24 1987-01-23 Procédé et dispositif de régénération d'un filtre à suie pour moteurs diesel Expired - Lifetime EP0231828B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3602038 1986-01-24
DE3602038A DE3602038C1 (de) 1986-01-24 1986-01-24 Verfahren und Vorrichtung zur Regenerierung eines Dieselrussfilters

Publications (2)

Publication Number Publication Date
EP0231828A1 true EP0231828A1 (fr) 1987-08-12
EP0231828B1 EP0231828B1 (fr) 1990-05-30

Family

ID=6292495

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87100911A Expired - Lifetime EP0231828B1 (fr) 1986-01-24 1987-01-23 Procédé et dispositif de régénération d'un filtre à suie pour moteurs diesel

Country Status (2)

Country Link
EP (1) EP0231828B1 (fr)
DE (2) DE3602038C1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3806219A1 (de) * 1988-02-26 1989-09-07 Pattas Konstantin N Russfiltersystem
DE3832790A1 (de) * 1988-09-27 1990-03-29 Pattas Konstantin N Verfahren und einrichtung zum regenerieren eines russfilters
GB2251653A (en) * 1990-12-22 1992-07-15 Daimler Benz Ag Fuel injection pump control responsive to altitude and engine exhaust pressure.
FR2808049A1 (fr) * 2000-04-21 2001-10-26 Toyota Motor Co Ltd Epurateur de gaz d'echappement pour moteur a combustion interne

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3538109C1 (de) * 1985-10-26 1987-02-26 Man Technologie Gmbh Dieselmotor mit Russfilter
DE3643315A1 (de) * 1986-12-18 1988-06-30 Kloeckner Humboldt Deutz Ag Verfahren und vorrichtung zum abbrennen des in einem russfilter einer luftverdichtenden brennkraftmaschine angesammelten russes
JPH01127016A (ja) * 1987-11-12 1989-05-19 Ngk Insulators Ltd セラミックハニカムフィルターの燃焼再生方法
DE3818158A1 (de) * 1988-05-28 1989-12-07 Man Nutzfahrzeuge Ag Verfahren und vorrichtung zum beseitigen von in einem abgasfilter einer brennkraftmaschine abgeschiedenem russ
DE19701684A1 (de) * 1997-01-20 1998-07-23 Deutz Ag Partikelfilter

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1135294A (fr) * 1954-06-05 1957-04-26 Dispositif pour l'utilisation de la pression dynamique régnant devant le papillon de freinage disposé dans le conduit d'échappement, applicable aux moteurs à combustion interne munis d'un frein au moteur
GB2010971A (en) * 1977-12-22 1979-07-04 Daimler Benz Ag Key-Operated Starting and Switching-Off Systems for Motor Vehicle Internal Combustion Engines
DE2930969A1 (de) * 1979-07-31 1981-02-26 Daimler Benz Ag Russfilter im abstroemweg der abgase einer brennkraftmaschine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1135294A (fr) * 1954-06-05 1957-04-26 Dispositif pour l'utilisation de la pression dynamique régnant devant le papillon de freinage disposé dans le conduit d'échappement, applicable aux moteurs à combustion interne munis d'un frein au moteur
GB2010971A (en) * 1977-12-22 1979-07-04 Daimler Benz Ag Key-Operated Starting and Switching-Off Systems for Motor Vehicle Internal Combustion Engines
DE2930969A1 (de) * 1979-07-31 1981-02-26 Daimler Benz Ag Russfilter im abstroemweg der abgase einer brennkraftmaschine

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3806219A1 (de) * 1988-02-26 1989-09-07 Pattas Konstantin N Russfiltersystem
DE3832790A1 (de) * 1988-09-27 1990-03-29 Pattas Konstantin N Verfahren und einrichtung zum regenerieren eines russfilters
US5067973A (en) * 1988-09-27 1991-11-26 Pattas Konstatin N Method of and an apparatus for regenerating a diesel particulate exhaust filter
GB2251653A (en) * 1990-12-22 1992-07-15 Daimler Benz Ag Fuel injection pump control responsive to altitude and engine exhaust pressure.
GB2251653B (en) * 1990-12-22 1994-09-21 Daimler Benz Ag An arrangement for controlling the quantity of fuel injected into an internal combustion engine
FR2808049A1 (fr) * 2000-04-21 2001-10-26 Toyota Motor Co Ltd Epurateur de gaz d'echappement pour moteur a combustion interne

Also Published As

Publication number Publication date
DE3602038C1 (de) 1987-01-02
EP0231828B1 (fr) 1990-05-30
DE3762983D1 (de) 1990-07-05

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