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
  • F01N13/009—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 having two or more separate purifying devices arranged in series
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
  • B60H1/00—Heating, cooling or ventilating [HVAC] devices
  • B60H1/02—Heating, cooling or ventilating [HVAC] devices the heat being derived from the propulsion plant
  • B60H1/025—Heating, cooling or ventilating [HVAC] devices the heat being derived from the propulsion plant from both the cooling liquid and the exhaust gases of the propulsion plant
• • 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
  • F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy
  • F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy the devices using heat
• • 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
  • F02B29/0437—Liquid cooled heat exchangers
• • 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
• • 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
  • F02M26/06—Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream of the compressor
• • 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
  • F02M26/28—Layout, e.g. schematics with liquid-cooled heat exchangers
• • 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
  • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
  • F01N2240/36—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being an exhaust flap
• • 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
  • F01N3/033—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 in combination with other devices
  • F01N3/035—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 in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
  • F01P2060/00—Cooling circuits using auxiliaries
  • F01P2060/08—Cabin heater
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
  • F01P2060/00—Cooling circuits using auxiliaries
  • F01P2060/16—Outlet manifold
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
  • F01P2060/00—Cooling circuits using auxiliaries
  • F01P2060/18—Heater
• • 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
  • F02D—CONTROLLING COMBUSTION ENGINES
  • F02D41/00—Electrical control of supply of combustible mixture or its constituents
  • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
  • F02D41/0047—Controlling exhaust gas recirculation [EGR]
  • F02D41/0065—Specific aspects of external EGR control
• • 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
  • F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system
  • F02M26/15—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system in relation to engine exhaust purifying apparatus
• • 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
  • F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system
  • F02M26/16—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system with EGR valves located at or near the connection to the exhaust system
• • 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
  • F02M26/25—Layout, e.g. schematics with coolers having bypasses
• • 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
  • F02M26/42—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories having two or more EGR passages; EGR systems specially adapted for engines having two or more cylinders
  • F02M26/44—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories having two or more EGR passages; EGR systems specially adapted for engines having two or more cylinders in which a main EGR passage is branched into multiple passages
• • 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
  • F02M26/65—Constructional details of EGR valves
  • F02M26/71—Multi-way valves
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
  • Y02T10/00—Road transport of goods or passengers
  • Y02T10/10—Internal combustion engine [ICE] based vehicles
  • Y02T10/12—Improving ICE efficiencies

Definitions

• the invention relates to a motor vehicle cabin heating system and / or engine components such as engine oil or gearbox, combined with a motorization equipped with solutions for reducing NOx emissions to the engine. exhaust, by EGR (Exhaust Gas Recirculation) low pressure and possibly high pressure.
• EGR exhaust Gas Recirculation
• the invention also relates to a motor vehicle as such equipped with such a system. Finally, it also relates to a method for regulating the heating of the passenger compartment of a motor vehicle.
• FIG. 1 illustrates such a solution, which comprises a motor 1 fed with air through an inlet 2, a compressor 3, an exchanger 4 and then a motor inlet 5.
• a first solution known under the name Anglo-Saxon EGR (Exhaust Gas Recirculation) high pressure, consists of a recirculation 12 of the exhaust gas at the output of the engine, passing through a heat exchanger 13 before joining the
• a second solution known under the name of low pressure EGR, consists of a recirculation 1 1 of a portion of the exhaust gas recovered to the vehicle exit, after their passage through different treatment devices such as a catalyst 21, an oxidation catalyst, a particulate filter 22, for their readmission to the inlet of the compressor 3.
• An exhaust valve 7 makes it possible to adjust the amount of low pressure gas recirculation st.
• the operation of high and low pressure EGR solutions is usually combined and optimized according to the operating conditions of the engine. For example, the recirculation of high pressure gases cooled or uncooled with that of the low gases pressure avoids the increase of HC and CO emissions during a warm-up phase.
• low pressure EGR sometimes leads to overproduction of hydrocarbon, which can be compensated for by high pressure EGR.
• the high pressure EGR cooler 13 can be bypassed because it is harmful.
• the EGR is generally cut off when the engine is cold because its use under these conditions causes an accumulation of particles in the filter.
• the new engines have reached a level of efficiency such that the transfer of heat from the combustion chambers and from the friction zones of the mechanical elements to each other towards the coolant has become very low.
• This loss of heat dissipation and therefore thermal power prevents thermal comfort in the passenger compartment in a reasonable time, particularly in low outdoor temperature conditions (about 30 minutes after starting the engine in a very cold environment, for example - 18 ° C). It also leads to over-consumption of the vehicle in the start-up and engine warm-up phase.
• Patent Application FR 2 854 103 discloses an automotive cabin heating system solution comprising a motor coolant circuit, having a heater and an exhaust-coolant exchanger, positioned at the outlet of the exhaust line.
• a valve makes it possible to define, as required, the quantity of useful exhaust gas at the level of the exhaust gas-liquid exchanger, the remainder of the gases being directed towards a bypass. With such a system, a portion of the heat of the exhaust gas is used to heat the coolant whose heat is then used for heating the cabin via the heater. This solution improves the temperature rise of the cabin during the start-up phase.
• the object of the invention is to provide a heating system of the passenger compartment of a vehicle and / or components of the engine for a vehicle equipped with a low-pressure EGR pollution device, obviating the drawbacks mentioned above .
• the invention proposes a cooling liquid heating system combined with a low pressure EGR anti-pollution system allowing optimal performance of the two systems in all situations, especially in the vehicle start-up phase, without increasing its consumption. .
• the invention is based on a heating system for a motor vehicle comprising a motor, an exhaust line for the exhaust gas and a possible recirculation path of the low-pressure exhaust gas at the inlet of the compressor of the intake line. gases to the engine, this recirculation being controlled by a recirculation valve, characterized in that the system comprises a heat exchanger on the recirculation path, adapted to recover the heat of the exhaust gas.
• the heating system for a motor vehicle may include a first two-way valve to the exit of the line exhaust system to control the low-pressure exhaust gas recirculation rate and a second two-way valve on the recirculation path to refine the exhaust gas recirculation rate.
• the heating system for a motor vehicle comprises a pipe in parallel with the heat exchanger, making it possible to orient all or part of the exhaust gases downstream of the heat exchanger towards the exit of the heat exchanger. exhaust line.
• the heating system for a motor vehicle may include a first two-way valve to the outlet of the exhaust line to control the recirculation rate of the low-pressure exhaust gas to the recirculation channel, a second valve two channels on the recirculation path to the compressor inlet to refine the exhaust gas recirculation rate and a third two-way valve positioned downstream of the heat exchanger on the pipe to guide or not a a certain amount of gas leaving the exchanger directly to the outlet of the exhaust.
• the motor vehicle heating system may include a first three-way valve to the exit of the exhaust line to control the recirculation rate of the low pressure exhaust gas to the recirculation channel and a second valve three. downstream of the heat exchanger on the recirculation path at the intersection of the pipe and the return path to the engine inlet in order to or not to direct a certain amount of gas at the outlet of the exchanger directly to the exhaust outlet.
• the heat exchanger can be connected in parallel with exhaust gas aftertreatment systems such as a particulate filter.
• the heat exchanger may be an exhaust-liquid exchanger for heating the coolant and the heating system further comprises a heater adapted to heat the air entering the passenger compartment of the motor vehicle and / or a liquid-oil exchanger for heating the engine oil and / or the gearbox.
• the heating system may also include a coolant temperature sensor at the engine outlet and a cabin air temperature sensor.
• the heating system for a motor vehicle described above may comprise means able to shift the injection of a portion of the fuel into the engine in order to increase the enthalpy of the exhaust gases.
• the previous heating system may include a high pressure EGR.
• the invention also relates to a motor vehicle comprising a heating system as described above.
• the invention also relates to a method for regulating the temperature of the passenger compartment of a motor vehicle, characterized in that it comprises an initial step of temperature rise in which the water temperature at the outlet of the engine is relatively low and the temperature of the passenger compartment has not yet reached the desired temperature, in which a first valve directs the low pressure exhaust gas to a heat exchanger for heating the cabin by recovering heat from the low pressure exhaust gas and wherein at least a second valve orients at least partially the exhaust of the gas exiting the heat exchanger directly outward exit of the exhaust line.
• This method of regulating the temperature of the passenger compartment of a motor vehicle may comprise a phase in which a part of the exhaust gas downstream of the heat exchanger is directly oriented outwards at the exit of the line of the vehicle. exhaust while the other part is oriented towards the engine intake to reduce the emission of gaseous pollutants.
• FIG. 1 represents a motorization solution of the prior art
• FIG. 2 represents the concept of the invention by a first embodiment of the invention
• Figure 3 shows a second embodiment of the invention
• FIG. 4 represents a variant of the second embodiment of the invention.
• FIG. 2 illustrates an implementation of the invention in which the same elements as in FIG. 1 of the prior art bear the same references.
• This solution provides for the use of a heat exchanger 19 positioned on the recirculation channel 1 1 of the exhaust gases of the low pressure EGR system, downstream of the particulate filter 22.
• This heat exchanger 19 is therefore positioned in parallel with the various after-treatment devices such as the catalyst 21 and the particulate filter 22 of the exhaust line 6.
• the two-way valve 7 serves to control the exhaust gas recirculation rate of the low-pressure EGR system.
• a second two-way valve 18 downstream of the heat exchanger 19 makes it possible to refine the recirculation rate.
• the function of the heat exchanger 19 is to cool the recirculation gases and to heat the vehicle coolant.
• This system is used in particular during the temperature rise of the engine when the vehicle is started to accelerate the rise in temperature of the coolant, the heat of which can be transmitted to the passenger compartment of the vehicle via a heater not shown and transmitted to the engine and gearbox oil via the coolant (ie with a "short loop") to reduce engine consumption during this cold start phase.
• FIG. 3 illustrates another embodiment of the invention in which a pipe 20 is further mounted downstream of the heat exchanger 19 to be able to return recirculation gases 1 1 to the outlet 16 of the line of exhaust, at the silencer not shown, if necessary.
• a two-way valve 17 called "return" is further positioned downstream of the heat exchanger 19 on the pipe 20. Its function is to orient or not a certain amount of gas at the outlet of the exchanger 19 directly to the exhaust outlet 16.
• FIG. 4 illustrates an alternative embodiment of the preceding embodiment in which two three-way valves 7 ', 18' are used to fulfill the functions of the three two-way valves 7, 17, 18 of the embodiment illustrated in FIG. 3
• the first valve 7 ' has the function of determining the rate of recirculation gas on the recirculation channel 1 1, in the context of the low-pressure EGR, while the second so-called “distribution" valve 18 'makes it possible to share the gases downstream of the heat exchanger 19 at the end of the recirculation circuit 1 1 between a return to the turbocharger 3 of the engine or an exhaust end of the exhaust line 16.
• This embodiment has the advantage of reducing the overall size of the solution, to simplify the exhaust gas circuits, to facilitate the steering of the whole and to reduce its cost.
• this device comprises a coolant temperature sensor at the output of the engine and an air temperature sensor of the passenger compartment, to allow automation of the regulation of the temperature of the passenger compartment.
• the heat recovered by the coolant through the exchanger 19 can also be used in a water-oil exchanger to increase the temperature rise of the gearbox oil, mechanical or no, and / or the engine oil, through a cooling circuit called "short loop" comprising an electric pump.
• This solution can thus have the advantage of reducing friction by improving the temperature rise of the oil, and consequently reducing the consumption during the temperature rise phase.
• a temperature rise phase when the engine is started in low temperature conditions, the engine outlet water temperature has not yet reached a threshold temperature, for example 60 degrees Celsius, the temperature of the engine cabin has not yet reached a desired temperature, 21 degrees Celsius for example: the valve 7 at least partially closes the outflow of gases to the outside and forces to the exchanger 19 by EGR low pressure recirculation 1 1 , while the valves 17, 18 or 18 'will induce an orientation of all or part of the gas directly to the exhaust 16, and not to the engine intake.
• a threshold temperature for example 60 degrees Celsius
• the temperature of the engine cabin has not yet reached a desired temperature, 21 degrees Celsius for example: the valve 7 at least partially closes the outflow of gases to the outside and forces to the exchanger 19 by EGR low pressure recirculation 1 1 , while the valves 17, 18 or 18 'will induce an orientation of all or part of the gas directly to the exhaust 16, and not to the engine intake.
• the hot exhaust gases will make it possible to heat the cooling liquid and / or the engine oil and / or the gearbox by the intermediate of the heat exchanger 19, respectively to accelerate the heating of the passenger compartment and / or reduce the consumption of the engine;
• the EGR system for reducing pollutants at the exhaust outlet can operate in parallel in an optimized manner. For example, in case of low outside temperatures for which its use is not always required because it causes a high production of particles accumulating in the particulate filter, it can be cut. In such a case, the heat of the hot exhaust gas can still be recovered without the EGR system being implemented, directing the gas directly to the outlet 16 after passing through the heat exchanger 19.
• the EGR system When the engine is warm, the EGR system will be able to operate in the usual way, the valves 7, 17, 18 or 18 'making it possible to fix the rate of gas recirculating towards the engine by the low pressure EGR system while the high pressure EGR valve 8 likewise determines the recirculation rate of the high pressure EGR.
• a dual EGR system recirculates both the low pressure circuit and the high pressure circuit, the return valve 17 and the valve 18 or the distribution valve 18 'allows (tent) a recirculation of a portion of the low pressure exhaust gas to the intake for the engine need in accordance with the normal operation of the EGR system and another part directly to the exhaust 16, the heat exchanger 19 however benefiting from heat exchange optimized for accelerated temperature rise of the coolant.
• the solution described above is adapted to a spark ignition engine or compression ignition, for circulating exhaust gas from the downstream of the particulate filter or a three-way catalyst or oxidation to the inlet turbocharger for supercharged engines, or engine intake for atmospheric engines. It is suitable for engines with exhaust front or rear, or arranged transversely too.

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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)
• Thermal Sciences (AREA)
• Exhaust-Gas Circulating Devices (AREA)

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Publications (1)

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ID=38516120

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Country Status (3)

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Citations (1)

Family Cites Families (4)

• 2007
  • 2007-02-27 FR FR0701400A patent/FR2913057B1/fr not_active Expired - Fee Related
• 2008
  • 2008-02-26 WO PCT/FR2008/050320 patent/WO2008125762A1/fr active Application Filing
  • 2008-02-26 EP EP08775651A patent/EP2125403A1/de not_active Withdrawn

Patent Citations (1)

Non-Patent Citations (1)

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