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WO2007011299A1 - Agencement et procédé pour la recirculation de gaz d’échappement dans un moteur à combustion - Google Patents

Agencement et procédé pour la recirculation de gaz d’échappement dans un moteur à combustion Download PDF

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Publication number
WO2007011299A1
WO2007011299A1 PCT/SE2006/050225 SE2006050225W WO2007011299A1 WO 2007011299 A1 WO2007011299 A1 WO 2007011299A1 SE 2006050225 W SE2006050225 W SE 2006050225W WO 2007011299 A1 WO2007011299 A1 WO 2007011299A1
Authority
WO
WIPO (PCT)
Prior art keywords
line
combustion engine
return line
valve means
egr cooler
Prior art date
Application number
PCT/SE2006/050225
Other languages
English (en)
Inventor
Kim KYLSTRÖM
Original Assignee
Scania Cv Ab (Publ)
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 Scania Cv Ab (Publ) filed Critical Scania Cv Ab (Publ)
Priority to DE112006001858T priority Critical patent/DE112006001858T5/de
Priority to JP2008522740A priority patent/JP2009501875A/ja
Publication of WO2007011299A1 publication Critical patent/WO2007011299A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/52—Systems for actuating EGR valves
    • F02M26/59—Systems for actuating EGR valves using positive pressure actuators; Check valves therefor
    • F02M26/60—Systems for actuating EGR valves using positive pressure actuators; Check valves therefor in response to air intake pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/12—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems characterised by means for attaching parts of an EGR system to each other or to engine parts
    • 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
    • F02B47/00—Methods of operating engines involving adding non-fuel substances or anti-knock agents to combustion air, fuel, or fuel-air mixtures of engines
    • F02B47/04—Methods of operating engines involving adding non-fuel substances or anti-knock agents to combustion air, fuel, or fuel-air mixtures of engines the substances being other than water or steam only
    • F02B47/08—Methods of operating engines involving adding non-fuel substances or anti-knock agents to combustion air, fuel, or fuel-air mixtures of engines the substances being other than water or steam only the substances including exhaust gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23—Layout, e.g. schematics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/36—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with means for adding fluids other than exhaust gas to the recirculation passage; with reformers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/45—Sensors specially adapted for EGR systems
    • F02M26/46—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition
    • F02M26/47—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition the characteristics being temperatures, pressures or flow rates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/50—Arrangements or methods for preventing or reducing deposits, corrosion or wear caused by impurities
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/52—Systems for actuating EGR valves
    • F02M26/53—Systems for actuating EGR valves using electric actuators, e.g. solenoids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G1/00—Non-rotary, e.g. reciprocated, appliances
    • F28G1/16—Non-rotary, e.g. reciprocated, appliances using jets of fluid for removing debris
    • F28G1/163—Non-rotary, e.g. reciprocated, appliances using jets of fluid for removing debris from internal surfaces of heat exchange conduits
    • 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
    • F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
    • F02B29/04—Cooling of air intake supply
    • F02B29/0406—Layout of the intake air cooling or coolant circuit
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
    • F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor

Definitions

  • the present invention relates to an arrangement and a method for recirculation of exhaust gases of a supercharged combustion engine according to the preambles of claims 1 and .
  • EGR exhaust gas recirculation
  • the return line for exhaust gases comprises inter alia an EGR valve which is settable to provide a desired amount of EGR.
  • An electrical control unit is adapted to controlling the EGR valve on the basis, inter alia, of information concerning the load of the combustion engine.
  • the exhaust gases are mixed with air which is at a relatively high pressure.
  • the EGR valve closes to increase the flow of fresh air to the engine so that the required engine load can be reached quickly without any increase in soot emissions.
  • a rapid reduction in engine load also requires closure of the EGR valve.
  • the EGR valve closes to maintain the charge pressure of the air as long as possible so that it can be used for any possible subsequent rapid increase in engine load.
  • the return line also comprises an EGR cooler adapted to cooling the exhaust gases in the return line before they mix with the air in an inlet line to the engine, hi course of time, soot deposits from the exhaust gases inevitably build up on the inside surfaces of the EGR cooler, thereby impairing the heat transfer capacity of the EGR cooler and at the same time increasing the resistance to the flow of exhaust gases through the EGR cooler. Insufficient cooling of the exhaust gases leads inter alia to impaired engine performance.
  • WO 2004/067945 refers to an arrangement for recirculation of exhaust gases of a supercharged combustion engine, which arrangement can in certain situations provide a backflow of air through an EGR cooler to clean the latter from soot deposits.
  • the object of the present invention is to provide an arrangement and a method of the kind mentioned in the introduction whereby the inside surfaces of the cooler are kept substantially free from soot deposits from the exhaust gases in an effective and simple manner.
  • valve means arranged in the inlet line it is possible to lead the compressed air from the inlet line to the return line and on through the EGR cooler. As the air flow in the inlet line is considerably greater than the normal exhaust flow through the return line, the result is an air flow of such magnitude and with such force through the EGR cooler that the latter' s inside surfaces are effectively cleaned from soot deposits.
  • the valve means is preferably placed in such a position as to lead the whole air flow in the inlet line to the return line, resulting in maximum air flow and optimum cleaning of the return line and the EGR cooler.
  • the return line comprises an EGR valve adapted to controlling the flow of exhaust gases from the exhaust line to the return line, and the connection point of said line to the return line is situated downstream from the EGR valve but upstream from the EGR cooler with respect to the intended direction of exhaust gas flow in the return line. It is therefore possible with the EGR valve in a closed position to guide the air flow in the return line in such a direction that the whole air flow passes through the EGR cooler.
  • the control unit is adapted to placing the valve means in the cleaning position during operating states of the combustion engine where the EGR valve is closed. Since no exhaust gases are led into the return line when the EGR valve is closed, it is advantageous to switch to cleaning the EGR cooler in such situations.
  • the EGR valve is normally closed at times when the load of the combustion engine is increasing rapidly or decreasing rapidly. During normal operation of a vehicle, rapid increases and decreases in the load of the combustion engine occur relatively frequently. There are therefore plenty of opportunities for cleaning the EGR cooler without affecting the exhaust gas recirculation process.
  • the arrangement comprises a sensor adapted to detecting a parameter related to the degree of deposits in the EGR cooler and informing the control unit about the value of said parameter.
  • a sensor may be a pressure sensor by which it is possible to determine the pressure drop of the exhaust gases in the EGR cooler.
  • the pressure drop of the exhaust gases in the EGR cooler is a parameter which increases with the degree of soot deposits in the EGR cooler.
  • An alternative sensor may be a flowmeter which measures the exhaust flow through the EGR cooler.
  • the exhaust flow is a parameter which decreases with the degree of soot deposits in the EGR cooler.
  • control unit is adapted to placing the valve means in a cleaning position in situations where it receives values pertaining to said parameter which indicate that the degree of deposits in the EGR cooler exceeds a maximum acceptable value.
  • control unit may initiate a cleaning process of the EGR cooler at specified intervals of time during the operation of the combustion engine.
  • control unit is adapted to receiving information concerning the speed of the combustion engine and the control unit is adapted to placing the valve means in said cleaning position and the EGR valve in an open position if the speed of the combustion engine exceeds a maximum acceptable speed value. Placing the valve means and the EGR valve in the aforesaid positions results in insufficient air being led to the combustion engine's cylinders for the fuel to ignite. The combustion engine is subjected to an emergency stop and the risk of damage which might be caused by overspeed of the engine is eliminated. A further function of the valve means is thus effected.
  • the inlet line comprises a compressor which compresses the air in the inlet line
  • the valve means is situated downstream from the compressor with respect to the direction of air flow in the inlet line.
  • the inlet line comprises a charge air cooler and the valve means is situated upstream from the charge air cooler with respect to the direction of air flow in the inlet line. Compressed air is thus led at high velocity through the EGR cooler. Warm compressed air cleans the EGR cooler more effectively than compressed air which has been cooled in the charge air cooler.
  • Fig. 1 depicts an arrangement for recirculation of exhaust gases of a supercharged combustion engine according to a first embodiment
  • Fig. 2 depicts the arrangement in Fig. 1 during cleaning of an EGR cooler
  • Fig. 3 depicts the arrangement in Fig. 1 during an emergency stop of the combustion engine
  • Fig. 4 depicts an arrangement for recirculation of exhaust gases of a supercharged combustion engine according to a second embodiment
  • Fig. 5 depicts a flowchart of a method according to the present invention.
  • Figs. 1-3 depict an arrangement for recirculating part of the exhaust gases of a supercharged combustion engine 1, which may be a diesel engine or an Otto engine. Such recirculation is usually called EGR (exhaust gas recirculation).
  • the combustion engine 1 is with advantage intended to power a heavy vehicle. Exhaust gases from the cylinders of the combustion engine 1 are led via an exhaust manifold 2 to an exhaust line 3.
  • the exhaust gases in the exhaust line 3, which are at above atmospheric pressure, are led through a turbine 4.
  • the turbine 4 is thus provided with driving power which is transmitted via a connection to a compressor 5.
  • the compressor 5 thereupon compresses air which is led to the combustion engine 1 via an inlet line 6.
  • the inlet line 6 comprises a charge air cooler 7 for cooling the compressed air before it is led, via a manifold 8, to the respective cylinders of the combustion engine 1.
  • a return line 9 is intended to recirculate part of the exhaust gases from the exhaust line 3.
  • the return line 9 comprises an EGR valve in the form of a first settable damper S 1 by which the exhaust flow in the return line 9 can, when necessary, be shut off. To some extent the first damper S 1 can also be used for controlling the amount of exhaust gases which is led through the return line 9.
  • An electrical control unit 10 is adapted to placing the first damper S 1 in a desired position during operation of the combustion engine 1.
  • the control unit 10 may be a computer unit which is provided with software stored on a data carrier 10a.
  • the return line 9 comprises an EGR cooler 11 for cooling the recirculating exhaust gases and an EGR mixer 12 which mixes the recirculating exhaust gases with the compressed air in the inlet line 6.
  • the exhaust gases led through the return line 9 contain soot particles which while, passing through the EGR cooler 11, may well settle on the heat transfer surfaces of the EGR cooler 11, resulting in the formation of soot deposits.
  • Soot deposits on the heat transfer surfaces of the EGR cooler 11 impair the cooler's ability to cool the exhaust gases. Insufficient cooling of the exhaust gases leads inter alia to impairment of the engine's performance. Soot deposits also obstruct the exhaust gas flow passages through the EGR cooler 11, thereby reducing the exhaust gas flow through the return line 9, which may lead to an increased discharge of emissions from the combustion engine 1.
  • a valve means in the form of a second damper S 2 is arranged in the inlet line 6 at a position between the compressor 5 and the charge air cooler 7.
  • a line 13 extends between the second damper S 2 and a connection point to the return line 9.
  • the connection point to the return line 9 is situated between the first damper S 1 and the EGR cooler 11.
  • the electrical control unit 10 is adapted to receiving operation-related information 14 concerning the combustion engine 1 to make it possible to control the first damper S 1 and the second damper s 2 .
  • the control unit 10 substantially continuously receives operation-related information 14 concerning the combustion engine 1. On the basis of information about, for example, the fuel supply to the combustion engine 1, the control unit 10 can determine the load of the combustion engine. When the combustion engine 1 is running at substantially constant load, the control unit 10 holds the first damper S 1 in an open position, resulting in a suitable amount of exhaust gases from the exhaust line 3 being led through the return line 9 and mixing with the compressed air in the inlet line 6. m certain operating situations, however, the control unit 10 closes the first damper S 1 , e.g. during rapid changes in the load of the combustion engine.
  • the control unit 10 closes the first damper S 1 during rapid load increase in order to increase the proportion of fresh air led via the inlet line 6 to the combustion engine 1. Load increase is thereby achieved quickly without increasing the amount of emissions.
  • the control unit 10 closes the first damper S 1 during a rapid load decrease in order to maintain as long as possible the charge pressure of the air, which may be used for a subsequent rapid increase in the engine's load. Rapid load reduction occurs inter alia during a gearchange process in the vehicle when a driver of the vehicle releases the accelerator pedal.
  • Fig. 1 depicts the arrangement at a time when the control unit 10 receives operation- related information 14 which indicates that the combustion engine is running at substantially constant load.
  • the control unit 10 has placed the first damper si in an open position so that exhaust gases are returned from the exhaust line 3 to the inlet line 6 via the return line 9.
  • the control unit 10 has placed the second damper s 2 in a normal position so that all the compressed air compressed by the compressor 5 in the inlet line 6 is guided by the second damper S 2 to the charge air cooler 7 before the air mixes with the returned exhaust gases in the EGR mixer 12.
  • Fig. 2 depicts the arrangement 1 at a time when the control unit 10 has received operation-related information 14 which indicates a rapid load reduction.
  • a driver of the vehicle may here have released the accelerator pedal in order to engage a different gear in the combustion engine's gearbox.
  • the control unit 10 stops the recirculation of exhaust gases through the return line 9 by placing the first damper S 1 in a closed position.
  • the control unit 10 will now have the possibility of placing the second damper S 2 in a cleaning position so that compressed air from the compressor 5 is led to the return line 9. In the cleaning position, the compressed air is led through the line 13 before it reaches the return line 9 at a position between the first damper Si and the EGR cooler 7.
  • the control unit 10 has the possibility of placing the second damper s 2 in a cleaning position each time the first damper S 1 is placed in a closed position.
  • the control unit 10 may be adapted to placing the second damper s 2 in a cleaning position at predetermined intervals, e.g.
  • control unit 10 may place the second damper s 2 in a cleaning position every tenth time the first damper S 1 is placed in the closed position.
  • the control unit 10 may also be adapted to placing the second damper S 2 in a cleaning position at specified intervals of time in order to clean the EGR cooler 11.
  • the control unit 10 may place the second damper S 2 in the cleaning position on the next occasion when the first damper S 1 is closed.
  • the control unit 10 may close the first damper S 1 directly and place the second damper s 2 in a cleaning position when such an interval of time has passed, irrespective of the combustion engine's load.
  • Fig. 3 depicts the arrangement at a time when the control unit 10 has received information 14 concerning the speed n of the combustion engine 1 which indicates that the combustion engine 1 is racing.
  • Engine racing may be regarded as occurring when the engine's speed n exceeds a maximum acceptable engine speed n max .
  • the control unit 10 receives information which indicates that the engine's speed n exceeds the maximum acceptable engine speed n max , the control unit 10 places the first damper Si in an open position and the second damper S 2 in a cleaning position, thereby guiding the compressed air in the inlet line 6 to the return line 9 via the second damper s 2 .
  • the air is led mainly towards the exhaust line 3, resulting in so little air being led to the combustion engine 1 that combustion in the combustion engine's cylinders becomes impossible.
  • the combustion engine 1 is thus subjected to an emergency stop and damage due to overspeed can be avoided.
  • Fig. 4 depicts an arrangement equipped with a pressure sensor 15 arranged in the return line 9 downstream from the EGR cooler 11.
  • the pressure sensor 15 detects the pressure of the exhaust gases after they have left the EGR cooler 11.
  • the pressure sensor 15 is adapted to sending to the control unit 10 a signal concerning measured pressure values.
  • the control unit 10 is supposed to have knowledge of the exhaust gas pressure in the exhaust line 3 or the like so that the pressure drop of the exhaust gases through the EGR cooler 11 can be determined.
  • the pressure drop of the exhaust gases is related to the degree of soot deposits in the flow ducts of the EGR cooler 11.
  • the control unit 10 may compare estimated values for the pressure drop of the exhaust gases, when they have passed through the EGR cooler 11, with a reference value.
  • control unit 10 may place the second damper s 2 in the cleaning position during a subsequent operating situation where the first damper S 1 is closed, resulting in an abundant air flow at high velocity through the return line 9 and the EGR cooler 11, thereby effectively cleaning the inside surfaces of the EGR cooler 11 from soot deposits.
  • Fig. 5 depicts a flowchart of the function of the arrangement as above.
  • the process starts at 16.
  • the control unit 10 receives information 14 concerning the combustion engine's speed n.
  • the control unit 10 compares whether the speed n is below or equal to a maximum acceptable speed n max .
  • the control unit opens the first damper S 1 if it is not already open and places the second damper s 2 in the cleaning position, resulting in an emergency stop of the combustion engine 1 so that overspeed of the combustion engine 1 is avoided. Thereafter the process starts again at 16.
  • the process continues at 19, where the control unit 10 receives information 14 and decides whether exhaust gases have to be returned through the return line 9 or not. If the combustion engine 1 receives information 14 which indicates substantially constant load of the combustion engine, the control unit 10 will find that there is nothing to prevent recirculation of exhaust gases through the return line 9. In this situation, at 20, the control unit 10 places the first damper Si in an open position and the second damper s 2 in a normal position. If the control unit 10 at the same time receives information from, for example, the pressure sensor 15 which indicates that the EGR cooler 11 needs cleaning, this may be left until a subsequent more convenient opportunity, since obstruction of an EGR cooler 11 is usually not so acute as to need remedying immediately. Thereafter the process starts again at 16.
  • control unit 10 receives information 14 which indicates a rapid load increase or load decrease of the combustion engine 1, it will find that the recirculation of exhaust gases through the return line 9 has to be stopped.
  • the control unit 10 will then, at 21, place the first damper S 1 in a closed position. Thereafter the control unit 10 will decide, at 22, whether the EGR cooler 11 needs cleaning.
  • the control unit 10 may make such a decision on the basis of information from the pressure sensor 15 or knowledge of when the latest cleaning was carried out. If no cleaning is needed, the control unit 10 will, at 23, continue to hold the second damper s 2 in a normal position. Thereafter the process starts again at 16.
  • the control unit 10 finds that cleaning of the EGR cooler 11 is needed, the second damper s 2 will be placed in a cleaning position, at 24, resulting in a large air flow at high velocity through the EGR cooler 11 so that the latter' s inside surfaces are cleaned from soot deposits.
  • Such regular cleaning of the EGR cooler makes it possible to maintain good performance over a long operating period without needing to carry out service operations in order to clean or replace it.
  • All the process steps, and any desired subsequences of steps, described above can of course be controlled by a computer programme which is directly loadable to the internal memory of a computer and comprises suitable software for controlling the necessary steps when the programme is run on the computer, hi addition, even if the embodiment of the invention described with reference to the drawings is software- controlled by means of a computer and processes performed by a computer, the invention also extends to a computer programme, particularly such a computer programme which is stored on a data carrier adapted to implementing the invention.
  • the programme may be in the form of source code, object code, a code at a level between source and object code, e.g. in partly compiled form, or in whatever other form may be advantageous for use in implementing the method according to the invention.
  • the data carrier may be any desired entity or device capable of storing the programme.
  • the data carrier may comprise a storage medium such as ROM (Read Only Memory), PROM (Programmable read-only memory), EPROM (Erasable PROM), Flash or EEPROM (Electrically EPROM).
  • the data carrier may take the form of a transferable carrier, such as an electrical or optical signal which can be transferred via an electrical or optical cable or by radio or in some other way.
  • the data carrier may take the form of such a cable, device or equipment.
  • the data carrier may be an integrated circuit in which the programme is stored, whereby the integrated circuit is adapted to performing, or being used in the performance of, relevant processes.
  • the invention is in no way limited to the embodiment referred to in the drawings but may be varied freely within the scopes of the claims. The invention is applicable to substantially all types of combustion engines where air is supplied at above atmospheric pressure to the combustion engine.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Analytical Chemistry (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Abstract

La présente invention concerne un agencement et un procédé pour la recirculation de gaz d’échappement d’un moteur à combustion (1). L’agencement comprend un moyen de soupape (S2) agencé dans le conduit d’admission (6), un conduit (13) s’étendant depuis le moyen de soupape (S2) vers un point de raccordement (9a) vers le conduit de retour, lequel point de raccordement (9a) est situé en amont du refroidisseur de gaz d’échappement (11) par rapport à la direction voulue du flux de gaz d’échappement dans le conduit de retour (9), et une unité de commande (10) qui, dans certaines situations, est adaptée pour placer le moyen de soupape (S2) dans une position de nettoyage de manière à ce qu’au moins une partie de l’air comprimé dans le conduit d’admission (6) soit entraînée par l’intermédiaire du moyen de soupape (S2) et ledit conduit (13) vers le conduit de retour (9), moyennant quoi l’air est entraîné dans une direction telle qu’il s’écoule à travers le refroidisseur de gaz d’échappement (11).
PCT/SE2006/050225 2005-07-18 2006-06-28 Agencement et procédé pour la recirculation de gaz d’échappement dans un moteur à combustion WO2007011299A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE112006001858T DE112006001858T5 (de) 2005-07-18 2006-06-28 Anordnung und Verfahren zum Rückführen von Abgasen in einem aufgeladenen Verbrennungsmotor
JP2008522740A JP2009501875A (ja) 2005-07-18 2006-06-28 過給式燃焼機関の排気ガスを再循環させる装置および方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0501701A SE528881C2 (sv) 2005-07-18 2005-07-18 Arrangemang och förfarande för återcirkulation av avgaser hos en förbränningsmotor
SE0501701-7 2005-07-18

Publications (1)

Publication Number Publication Date
WO2007011299A1 true WO2007011299A1 (fr) 2007-01-25

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PCT/SE2006/050225 WO2007011299A1 (fr) 2005-07-18 2006-06-28 Agencement et procédé pour la recirculation de gaz d’échappement dans un moteur à combustion

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010107368A1 (fr) * 2009-03-18 2010-09-23 Scania Cv Ab Procédé et dispositif pour un système de recirculation des gaz d'échappement d'un moteur à combustion interne et véhicule associé
WO2010123411A1 (fr) * 2009-04-23 2010-10-28 Volvo Lastvagnar Ab Procédé et agencement de recirculation des gaz d'échappement d'un moteur à combustion
EP2357351A1 (fr) * 2010-02-01 2011-08-17 Deere & Company Système de recirculation des gaz d'échappement et système d'alimentation
CN102383973A (zh) * 2010-09-01 2012-03-21 通用汽车环球科技运作有限责任公司 调节流体动力流动特性以减轻机动车热交换器的污染
FR3010138A1 (fr) * 2013-08-27 2015-03-06 Peugeot Citroen Automobiles Sa Procede et circuit de decrassage d'une ligne du type a recirculation des gaz d'echappement dedie
CN107725222A (zh) * 2016-08-10 2018-02-23 现代自动车株式会社 通过吹气从egr去除杂质的方法、egr系统及包含该egr系统的车辆

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH703770A1 (de) * 2010-09-02 2012-03-15 Alstom Technology Ltd Verfahren zum spülen der abgasrezirkulationsleitungen einer gasturbine.
JP5754755B2 (ja) * 2011-02-11 2015-07-29 ボルボ ラストバグナー アーベー 給気冷却器及びｅｇｒシステムを備えたエンジン配置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2725045A1 (de) * 1977-06-03 1978-12-14 Motoren Turbinen Union Verfahren zur reinigung eines waermetauschers
WO2004067945A1 (fr) * 2003-01-31 2004-08-12 Scania Cv Ab (Publ) Agencement et procede de recirculation des gaz d'echappement d'un moteur a combustion

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3733707B2 (ja) * 1997-09-19 2006-01-11 いすゞ自動車株式会社 Ｅｇｒクーラー付きｅｇｒ装置
JP3719842B2 (ja) * 1998-03-17 2005-11-24 日産ディーゼル工業株式会社 Ｅｇｒ装置
JP3647250B2 (ja) * 1998-03-17 2005-05-11 日産ディーゼル工業株式会社 Ｅｇｒ装置
JP4035480B2 (ja) * 2003-06-02 2008-01-23 日産ディーゼル工業株式会社 Ｅｇｒクーラー

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2725045A1 (de) * 1977-06-03 1978-12-14 Motoren Turbinen Union Verfahren zur reinigung eines waermetauschers
WO2004067945A1 (fr) * 2003-01-31 2004-08-12 Scania Cv Ab (Publ) Agencement et procede de recirculation des gaz d'echappement d'un moteur a combustion

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010107368A1 (fr) * 2009-03-18 2010-09-23 Scania Cv Ab Procédé et dispositif pour un système de recirculation des gaz d'échappement d'un moteur à combustion interne et véhicule associé
WO2010123411A1 (fr) * 2009-04-23 2010-10-28 Volvo Lastvagnar Ab Procédé et agencement de recirculation des gaz d'échappement d'un moteur à combustion
EP2357351A1 (fr) * 2010-02-01 2011-08-17 Deere & Company Système de recirculation des gaz d'échappement et système d'alimentation
CN102383973A (zh) * 2010-09-01 2012-03-21 通用汽车环球科技运作有限责任公司 调节流体动力流动特性以减轻机动车热交换器的污染
FR3010138A1 (fr) * 2013-08-27 2015-03-06 Peugeot Citroen Automobiles Sa Procede et circuit de decrassage d'une ligne du type a recirculation des gaz d'echappement dedie
CN107725222A (zh) * 2016-08-10 2018-02-23 现代自动车株式会社 通过吹气从egr去除杂质的方法、egr系统及包含该egr系统的车辆

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DE112006001858T5 (de) 2008-06-05
SE0501701L (sv) 2007-01-19
SE528881C2 (sv) 2007-03-06

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