Classifications

• • 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
  • F01P7/00—Controlling of coolant flow
  • F01P7/14—Controlling of coolant flow the coolant being liquid
  • F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
  • F01P7/165—Controlling of coolant flow the coolant being liquid by thermostatic control characterised by systems with two or more loops
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
  • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
  • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
  • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
  • F28D1/0408—Multi-circuit heat exchangers, e.g. integrating different heat exchange sections in the same unit or heat exchangers for more than two fluids
  • F28D1/0426—Multi-circuit heat exchangers, e.g. integrating different heat exchange sections in the same unit or heat exchangers for more than two fluids with units having particular arrangement relative to the large body of fluid, e.g. with interleaved units or with adjacent heat exchange units in common air flow or with units extending at an angle to each other or with units arranged around a central element
  • F28D1/0443—Combination of units extending one beside or one above the other
• • 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
  • F01P2060/02—Intercooler

Definitions

• the present invention relates to a thermal management device for a motor vehicle equipped with a heat engine, in particular a supercharged internal combustion engine.
• a heat engine in particular a supercharged internal combustion engine.
• various technological developments have been proposed by manufacturers in the field of combustion, supercharging, and exhaust gas treatments. These developments require the search for new thermal management devices to evacuate an increasing amount of heat from the engine, especially at high speed and high load, and to cool the engine air supercharging, some of the gases of the engine.
• exhaust systems before their reintroduction into the combustion chamber referred to as recirculated exhaust gas or EGR (Exhaust Gas Recirculation) gas, and, if applicable, the air-conditioning air conditioning condenser of the passenger compartment and the electrotechnical components for hybrid vehicles.
• EGR exhaust Gas Recirculation
• the thermal management devices conventionally comprise a conventional cooling main circuit of the heat engine, equipped with a main pump and a high temperature main radiator, and a secondary low temperature cooling circuit, equipped with a secondary pump and a secondary radiator operating at low temperature to evacuate all the calories from the charge air and EGR gas.
• the temperature of the coolant must be weaker and weaker to meet ever more stringent pollutant emission standards. Furthermore, there is an increase in the EGR gas rate, it can remain high even for high speeds and loads of the engine, which increases the amount of heat to be removed by the secondary circuit.
• the secondary radiator can not evacuate a large amount of heat given the small temperature difference between the coolant and the ambient air, it is very difficult to keep the coolant at low temperature in the secondary circuit. Increasing the size of the secondary radiator would have a negative impact on the high temperature radiator since it would decrease the overall air velocity on the cooling case and increase the air temperature upstream of the high temperature radiator. In order to be able to evacuate the calories from the main circuit, it would then be necessary to increase the size of the main radiator, which already has a very large front surface.
• patent document FR 2 832 187 For the cooling of the secondary circuit, it has been proposed in patent document FR 2 832 187 to use the main radiator.
• This patent document notably describes interconnection means between the main circuit and the secondary circuit, formed by two 3-way valves and a 4-way valve, which make it possible to integrate the main radiator in the low temperature loop.
• this patent document proposes to cut the main radiator into two sections. One of the two sections may be used to assist the coolant cooling of the low-power secondary circuit of the engine, and this radiator section will be returned to the high-power main circuit of the engine.
• the switchover of this section of a cooling loop to the other loop is done through interconnection means formed either of two valves with 4 channels implanted cnaque side of the main radiator, or a single valve with 6 channels.
• the object of the present invention is to provide a thermal management device overcoming the aforementioned drawbacks, which allow efficient cooling of the secondary circuit at low temperature, while remaining simple design.
• the subject of the present invention is a thermal management device for a motor vehicle equipped with a heat engine, in particular a supercharged internal combustion engine, comprising a main circuit for cooling at high temperature, comprising a high temperature loop.
• a secondary low temperature cooling circuit including a low temperature loop equipped with a secondary low temperature radiator and means for circulating a cooling liquid at low temperature, and interconnection means connecting the main circuit and the secondary circuit, said interconnection means for integrating the two sections of the main radiator to the main circuit or to integrating the first section with the main circuit and the second section with the secondary circuit, characterized in that - the first inlet and the second inlet of the first section of the main radiator are respectively connected to a first main radiator pipe and a second radiator pipe principal of the high temperature loop, the first input of the second section being connected to the low temperature loop, upstream of the secondary radiator, and connected to the first input of the first section by means of fluid communication means; interconnection comprising a
• the present invention provides a simple design thermal management device and compact with a single four-way valve system allowing in particular to use a part or all of the main radiator for cooling the liquid of the secondary loop at speed and load moderates of the engine.
• the device according to the invention has a high caloric evacuation capacity of the integrated components on the secondary circuit for cooling at low temperature, in particular the EGR / liquid gas radiator, the charge air / liquid radiator, the air conditioning condenser, and / or electrotechnical components in the case of a hybrid vehicle.
• the thermal management device according to the invention makes it possible to meet the cooling needs of the EGR gases, in particular for high EGR gas rates, and the cooling requirements of the supercharged air for a high thermal power, as in the case of a double supercharging.
• the valve system is able to put the first channel in communication with the second and third ways for cooling the heat engine using the secondary radiator, in a mode of operation in degraded mode.
• the device according to the invention thus makes it possible to meet the cooling needs of the high-power engine, with maximum cooling of the heat engine.
• valve system is able to connect the first channel and the third channel to cool the internal combustion engine and any members mounted on the high temperature loop, such as the turbocharger bearing, during the hot shutdown of the engine, in a cooling mode operation of the engine.
• the main circuit comprises a main thermostat on the first main radiator pipe to cut, in a closed position, and allow, in an open position, the flow of fluid towards the main radiator.
• the cooling device advantageously comprises a bypass line connecting the first main radiator pipe, upstream of the main thermostat, to a heat recovery thermostat, mounted on the connecting pipe from the first inlet of the second section to the low loop.
• said thermostat placing in communication the second section with the low temperature loop in an open position, for said operation in degraded mode and in normal mode with reinforced and very reinforced cooling, or the bypass line with the low temperature loop in a closed position, for the recovery of calories in a cold start mode operation and / or heating mode of the passenger compartment when the engine stops, operation in which the valve system communicates the first channel and the third channel .
• the device according to the invention thus enables the recovery of calories from the secondary circuit, in particular radiators RAS and EGR to accelerate the rise in temperature of the engine during the start fro ⁇ d of the engine, and the recovery of calories stored in the engine and the coolant for maintaining the heating of the passenger compartment when stopping the engine, as for example, on hybrid vehicles incorporating the Stop and Start function (stopping the engine during a prolonged stop in traffic jam or during a long stop where the driver would remain in the vehicle and would require heating).
• the low temperature loop comprises a bypass line of the low temperature radiator connected upstream of the secondary radiator to a heat recovery thermostat.
• said valve system comprises four controlled two-way valves: a first valve connecting the first and third channels, a second valve connecting the second and third channels, a third valve connecting the first and second channels and a fourth valve; valve connecting the third and fourth lanes.
• the main radiator is formed of a single exchanger with a first and a second header, the first and second sections being defined by a bulkhead and a honeycomb partition respectively positioned in the first and the second manifold, said honeycomb partition constituting said fluid communication means.
• the lower portions of the first and second manifolds comprise respectively the second and the first inlet of the second section.
• the upper portions of the first and second manifolds respectively comprise the second and the first inlet of the first section, or the first box comprises a second bulkhead defining an upper portion and an intermediate portion respectively provided with the first and second inlet of the first section, to form a first section with two passes.
• the main radiator is formed ⁇ e two separate exchangers each forming a section of the main radiator, each exchanger comprising two manifolds, each header comprises a section inlet, the manifolds provided with the first inputs are for example connected by a tube forming the fluidic communication means.
• the low temperature loop advantageously incorporates a charge / liquid air radiator, called RAS radiator, and a recirculated / liquid exhaust gas radiator, called EGR radiator.
• the EGR radiator and / or the radiator RAS comprise upstream downstream with respect to the gaseous flows passing through them, at least one high temperature part, connected to the main circuit, and a low temperature part connected to the secondary circuit. for cooling at two temperature levels of said gas flows.
• the use of such radiators at two temperature levels allows effective cooling of the charge air and / or EGR gases, especially in case of high EGR gas recirculation rate, and / or in case of extension of the zone (engine torque regime) for recirculating gases at high speeds and heavy loads. They also allow operation in cold start mode in the absence of bypass line associated with a heat recovery thermostat.
• FIG. 1 shows a schematic view of a thermal management device for a motor vehicle equipped with a supercharged internal combustion engine according to a first embodiment of one invention
• Figure 2 shows an embodiment of the four-way valve system
• - Figures 3A and 3B illustrate two embodiments of the insertion of the honeycomb partition in the main radiator;
• FIG. 4A and 4B show two schematic views of a main radiator for the device of Figure 1 according to two embodiments;
• Figures 5 to 12 show schematic views of the thermal management device of Figure 1 illustrating different modes of operation;
• FIG. 13 represents a schematic view of a thermal management device according to a second embodiment;
• FIG. 14 represents a schematic view of a thermal management device according to a variant of the second embodiment of FIG. 13.
• the thermal management device according to the invention comprises two cooling circuits.
• a first high-temperature cooling circuit called primary or high temperature 1
• a second low-temperature cooling circuit said to be secondary or low-temperature 3 at a relatively low temperature level, of the order of 50 to 60 0 C
• a 4-way valve system designated by reference 4, for making communications between] c main circuit and the secondary circuit.
• the main circuit conventionally comprises, in series on a secondary or high temperature loop 11, the internal combustion heat engine 9, a main radiator or high temperature radiator 2, and a main pump 13, for example a mechanical pump driven by the engine, for the circulation in the circuit of a high temperature coolant, said liquid HT.
• the high temperature loop comprises a motor duct 111 on which the motor 9 and the main pump 13 are mounted, a first main radiator duct 112 and a second main radiator duct 113 connecting the main radiator to the motor duct 111, respectively downstream and upstream of the engine with respect to the direction of circulation of the HT liquid at the engine.
• the main circuit comprises an expansion tank 14 for filling and pressure regulation of the circuit, a heating radiator of the passenger compartment or heater 15, and a turbocharger bearing 16, each of them being mounted in a bridge between the first and the second main radiator pipe.
• This main circuit can integrate other members of the propulsion engine group to cool conventionally at high temperature, including water / oil lubrication of the engine and automatic gearbox.
• the secondary circuit 3 comprises a secondary low temperature loop 31 which comprises a pipe secondary radiator 311 on which are mounted a secondary radiator or low-temperature radiator 32, and a secondary pump 33, for example electric, for the circulation of the coolant coolant low temperature, said liquid BT.
• the secondary loop incorporates a cooler a ⁇ .r supercharger / liquid 34, said RAS exchanger, and a gas cooler EGR / liquid 35, said EGR exchanger, these two exchangers being for example connected in parallel on the low temperature loop downstream of the secondary radiator, as shown in FIG. 1.
• a first three-way heat recovery thermostat 36 for example of the double-acting wax type, is interposed on the secondary radiator pipe by two of its channels, upstream of the secondary radiator, a bypass line 37 connecting the third channel of the heat recovery thermostat with the secondary radiator pipe downstream of the secondary radiator. Below a BT fluid setpoint temperature, the heat recovery thermostatto is in a closed position in which the BT fluid bypasses the low temperature radiator through the bypass line. Above this set temperature, the heat recovery thermostat is in an open position in which the fluid BT passes through the low temperature radiator.
• the main radiator 2 consists of a single exchanger cut into a first heat exchange section 21 and a second heat exchange section 22.
• the first section comprises a first inlet 21a for its connection to the first radiator pipe main 112 and a second input 21b for its connection to the second main radiator pipe.
• the second section includes a first input 22a for its connection to the low temperature plug and a second input 22b for its connection. to one of the channels of the valve system, as described below.
• the main radiator comprises tubes equipped with cooling fins, a first manifold 23 and a second manifold 24 located at the ends of the tubes.
• the first manifold is separated into an upper part 23a, an intermediate part 23b and a lower part 23c, by a first and a second separating bulkhead, respectively 25 and 26.
• the second box is separated into an upper part 24a and a lower part 24b, by a honeycomb partition 27 disposed at the same level as the second partition wall 26.
• the first and second sections are thus delimited by the second partition 26 and the honeycomb partition 27, the part upper 23a and the intermediate portion 23b of the first box respectively comprising the first inlet 21a and the second inlet 21b of the first section, to form a first section with two passes, the lower part 23c of the first header and the lower part 24b of the second manifold respectively comprising the second input 22b and the first input 22a of the second th section.
• the 4-way valve system comprises a first channel 41 connected by a connecting pipe 114 to the second main radiator pipe 113, a second channel 42 connected by a connecting pipe 115 to the second inlet 22b of the second section of the main radiator, a third channel 43 connected to the secondary radiator duct 311 downstream of the secondary pump and the RAS and EGR exchangers, and a fourth channel connected to the low temperature radiator pipe upstream of the secondary pump, the radiator system; valve being thus interposed on the low temperature loop through its third and fourth lanes.
• the first inlet 22a is connected by a connecting line 38 to the low temperature loop, upstream of the secondary pump with respect to the direction of fluid flow, between the secondary pump and the valve system.
• the main circuit further comprises a bypass line 18 connecting the first main radiator pipe, upstream of the main thermostat 17, to the low temperature loop via a second three-way heat recovery thermostat 5.
• This second thermostat is mounted in series by two of its channels on the connecting pipe 38, the bypass line being connected to its third channel. Below a set temperature, this heat recovery thermostat is in a so-called closed position in which the bypass line is in communication with the low temperature loop. Above this setpoint temperature, this thermostat is in an open position in which the second section is in communication with the low temperature loop.
• the valve system makes it possible to establish the following five communication modes between the 4 channels: - communication between the channels 41 and 43, to couple the main circuit and the secondary circuit, with the main thermostat 17 and the second thermostat of recovery of heat 5 in the closed position, the first heat recovery thermostat 36 being in the open or closed position;
• this valve system consists for example of four 2-way valves: a first valve 45 connecting the channels 41 and 43, a second valve 46 connecting the channels 42 and 43, a third valve 47 connecting the 41 and 42, and a fourth valve 48 connecting the channels 43 and 44.
• the honeycomb partition 27 may consist of a perforated body of vertical through holes, or an assembly of small crosspieces. Referring to Figure 3A, the honeycomb partition 27 is interposed between the ends of two consecutive tubes 28a, 28b of the main radiator, its thickness e being less than or equal to the spacing between the two consecutive tubes.
• the honeycomb partition ensures a fluid connection between the two sections of the main radiator, at the level of the second header, while avoiding or limiting the mixing between the fluid HT of the first section and the fluid BT of the second section when the latter are dedicated respectively to the main circuit and the secondary circuit.
• the honeycomb partition allows a small flow of fluid from the circuit secondary to the main circuit due to the expansion of the fluid during the rise phase of the secondary circuit, the flow of fluid passed through the honeycomb becoming zero thereafter by the conservation of the mass of fluid contained in the two circuits.
• This honeycomb partition saves an expansion tank in the low temperature loop, allowing the evacuation of the expanded water volume to the first section of the main radiator which is in communication with the expansion tank 14 of the main circuit.
• the honeycomb partition therefore plays the role of an expansion vessel.
• the honeycomb partition makes it possible to pass the fluid from the upper part to the lower part of the second. box to feed the second part of the radiator.
• the honeycomb partition allows the fluid to pass from the top to the bottom of the second box to allow fluid to pass into the first section.
• the honeycomb partition 270 is advantageously inserted into the second box so as to plug an intermediate tube 28c, and thus separate the two adjacent tubes 28a and 28b respectively belonging to the first section and the second section, in order to limit thermal exchanges between them.
• the thickness e of the honeycomb partition can then be increased for a better reduction of turbulence when the sections are dedicated to different circuits.
• the main radiator comprises a first section with a single pass ( Figure 4A), its first input being moved on the second manifold, and the first partition 25 above is removed.
• the radiator 102 with two sections 121 and 122 then comprises a first box 123 separated in two by a bulkhead 126, and a second box 124 separated as previously in two by a honeycomb partition 127 the upper portions 124a and 123b of the second box and the first box, respectively, respectively comprise the first input 121a and the second input 121b of the first section, the lower portions 123c and 124b of the first box and the second box respectively. respectively comprise the second input 122b and the first input 122a of the second section.
• the main radiator 202 then comprises a first exchanger forming the first section 221, which comprises a first box 223b provided with the second input 221b and a second box 224a provided with the first input 221a, and a second exchanger forming the second section 222 which comprises a first box 223c provided with the second input 222b and a second box 224b provided with the first input 222a, the second boxes 224a and 224b of the two heat exchangers being in fluid communication via a connection pipe 227.
• the secondary loop integrates the condenser of an air conditioning circuit and / or one or more other exchangers for the low temperature cooling of other components, in particular for the cooling of the charge air for the engines to double supercharging, and for cooling the machine electrical and power electronics on a hybrid vehicle, these exchangers being for example disposed between the channel 43 of the valve system and the RAS exchangers and EGR connected in parallel.
• the two heat exchangers RAS and EGR are arranged in series on the low temperature loop, the RAS exchanger being disposed upstream of the EGR exchanger with respect to the direction of circulation of low temperature fluid leaving the secondary radiator.
• the two exchangers are for example arranged between the secondary radiator and the channel 43 of the valve system.
• the heat exchanger RAS is disposed between the secondary radiator and the channel 43, and the EGR exchanger is disposed between the channel 44 and the secondary radiator, for example between the connection point of the connecting pipe 38 on the secondary radiator. the secondary loop and the secondary pump.
• Figure 5 illustrates operation in cold start mode, with heat recovery of the RAS and EGR exchangers.
• the main thermostat 17, and the heat recovery thermostats 36 and 5 are in the closed position to cut the fluid passage in the first section and the second section of the main radiator and in the secondary radiator, so that the fluid is not cooled by the ambient air, and the valve system communicates the track 41 and the track 42 to connect the secondary radiator duct downstream of the EGR and RAS exchangers to the second radiator duct 114, and thus to coax the two loops.
• the fluid is heated by the heat exchangers RAS and EGR, and any other components mounted on the low temperature loop, enters the main circuit via the valve system to heat the engine and the cabin, and returns to the low temperature loop. via the bypass line 18.
• the circulation of fluid in the two loops is provided by the main pump, the secondary electric pump can optionally be turned on.
• FIG. 6 illustrates a cold start mode operation similar to the previous one, with in addition cooling by the low temperature radiator.
• the fluid of the low temperature loop can reach a temperature level which exceeds the maximum set temperature for the cooling of the heat exchangers RAS and EGR, the first heat recovery thermostat 36 goes into the open position for that the fluid is cooled in the low temperature radiator before entering the RAS and EGR exchangers.
• Figure 7 illustrates operation in normal mode at moderate speed and load, with enhanced cooling of the secondary circuit.
• the engine When the engine is running at moderate speed and load, it can be cooled by the first section of the main radiator.
• the second section of this radiator is used to reinforce the cooling of the BT fluid of the low temperature loop.
• the valve system 4 communicates the channels 43 and 42 to integrate the second section of the main radiator with the low temperature loop.
• the BT fluid first passes through the second section of the main radiator goes to the connection line 115, through the secondary pump via the connecting pipe 31 with the thermostat 5 in the open position, then by the low-temperature radiator before passing through the RAS exchanger and the exchanger ECR.
• the two loops are independent, the main thermostat 17 can be opened or closed to allow the passage or not the fl ⁇ ide HT in two passes in the first section of the main radiator.
• Figure 8 illustrates a normal mode operation at moderate speed and load with a very reinforced cooling of the secondary circuit, the main thermostat in the closed position.
• the valve system is controlled to establish the communication between the channels 41 and 43 and between the channels. 43 and 42 and thus pass the liquid BT low temperature loop both in the second section and in the second pass of the first section defined at the intermediate portion 23b of the first manifold.
• the fluid BT passes through the second section of the main radiator via the connecting pipe 115, and the first section via the connecting pipe 114 and the second radiator pipe 113 connected to the second inlet 21b.
• the fluid then flows through the secondary pump via the connection line with the thermostat b in the open position, and through the low temperature radiator before passing through the RAS and EGR exchangers.
• FIGS. 4A and 4B the entire exchange surface of the first section of the radiators is used for the low temperature loop.
• Figure 9 illustrates normal mode operation at high speed and load.
• the valve system 4 communicates between the channels 41 and 42, and between the channels 43 and 44, the two circuits are independent.
• the main thermostat With the main thermostat in the open position, the fluid HT enters the first section of the main radiator through the first inlet 21a.
• the fluid arriving in the second box spring from the first section through its second inlet 21b, the other portion passes through the second section via the honeycomb partition to emerge through the second inlet 22b.
• FIG. 10 illustrates a degraded mode operation for the RAS and EGR exchangers, with maximum cooling of the heat engine assisted by the low temperature radiator.
• the engine cooling can be very critical on some vehicles of strong motorization.
• the device makes it possible to use the low-temperature radiator for cooling the heat engine. This corresponds to a degraded mode for the exchanger RAS and I 'EGR, their cooling is no longer provided to protect the operation of the engine.
• the valve system 4 communicates between the channels 41 and 42, and between the channels 43 and 41, the thermostats 17, 5 and 36 are all in the open position.
• the fluid leaving the engine passes through the two sections of the main radiator as before, and a portion of the fluid arriving in the lower part of the second box passes through the connecting pipe 38 connected to the first inlet, to pass into the low temperature loop, where it is cooled by the low temperature radiator before joining at the connecting pipe 114 the fluid leaving the second section.
• the secondary pump can be activated to promote fluid circulation in the low temperature loop by drawing fluid through the second inlet of the second section.
• FIG. 11 illustrates a cooling mode operation of the engine and the turbocharger bearing after the engine has been shut down by the secondary pump 36.
• the combustion gases can overheat the engine locally and / or the very hot metal masses around the turbocharger bearing can overheat the bearing lubricating oil.
• the electric secondary pump is started just after the engine stop, and the valve system 4 communicates the channels 41 and 42 to circulate the liquid in the engine and the turbocharger.
• FIG. 12 illustrates a maintenance mode operation of the cabin heater.
• FIG. 13 represents a simplified embodiment of the device of FIG. which bypass 18 and the thermostat 5 are removed, the second inlet of the second section being simply connected to the low temperature loop through the connecting pipe 38.
• This device more economical and simpler, has the same functionality the device of Figure 1, with the exception of maintaining heating mode of the passenger compartment ( Figure 12) and two cold start modes ( Figures 5 and 6) above.
• FIG. 14 represents an alternative embodiment of the second embodiment in which the EGR and / or RAS exchangers are first cooled with the HT liquid of the high temperature loop, then with the liquid BT of the low temperature loop.
• the exchangers RAS 134 and EGR 135 are each separated into two parts for cooling its gas flow at two temperature levels.
• Each exchanger comprises a low temperature portion connected to the secondary circuit via an inlet 134a, 135a and an output 134b, 135b, and a high temperature portion connected to the main circuit via an input 134c, 135c and an output 134d, 135d.
• the RAS exchanger comprises an upstream inlet and a downstream outlet for its series connection to the intake air circuit of the engine, so that the supercharging air passes through the exchanger through the high temperature part and then the low temperature part.
• the EGR exchanger comprises an upstream inlet and a downstream outlet for the series connection of the RAS exchanger on the engine EGR gas circuit, so that the EGR gases pass through the high temperature part and then the low temperature part.
• the low temperature parts are connected in parallel to the low temperature loop by their input and output.
• the high temperature parts are connected in series on the main circuit, between the first and the second main radiator duct 112 and 113, so that the HT fluid leaving the engine passes into the high temperature part of the RAS exchanger and then into the of the EGR exchanger.
• the inlet 134c of the high temperature part of the heat exchanger RAS is connected by a pipe 116 to the first radiator pipe main 112, and its output 134d is connected by a pipe 117 to the inlet 135c of the high temperature portion of the EGR exchanger, the outlet 135d of the latter étanc connected to the second main radiator pipe 113 through a pipe 118.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Thermal Sciences (AREA)
• Combustion & Propulsion (AREA)
• Physics & Mathematics (AREA)
• Chemical & Material Sciences (AREA)
• Exhaust-Gas Circulating Devices (AREA)
• Motor Or Generator Cooling System (AREA)
• Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
• Air-Conditioning For Vehicles (AREA)
• Vehicle Body Suspensions (AREA)
• Electric Propulsion And Braking For Vehicles (AREA)

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• 2005
  • 2005-12-28 FR FR0513426A patent/FR2895450B1/fr not_active Expired - Fee Related
• 2006
  • 2006-10-19 EP EP06820321A patent/EP1966473B1/de not_active Not-in-force
  • 2006-10-19 AT AT06820321T patent/ATE427416T1/de not_active IP Right Cessation
  • 2006-10-19 DE DE602006006096T patent/DE602006006096D1/de active Active
  • 2006-10-19 WO PCT/FR2006/051065 patent/WO2007074249A1/fr active Application Filing

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