• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a motor assembly (1) comprising a turbine (2) and an exhaust system discharging the engine gases and comprising a first duct (4) starting from a first manifold (5) and a second duct ( 6) discharging from a second collector (7), the turbine (2) having a casing (2c) surrounding it and an energy recovery wheel, the first conduit (4) opening into a main passage of relaxation housing the wheel. The second duct (6) opens into at least one branch portion (8) internal to the casing (2c) bypassing the main expansion passage, the main expansion passage and said at least one branch portion (8) joining at a outlet face (2b) of the housing (2c), the main expansion passage comprising, inside the turbine (2), an exhaust gas flow control valve therethrough.
    公开号:FR3037102A1
    申请号:FR1554986
    申请日:2015-06-02
    公开日:2016-12-09
    发明作者:Pagliari Diego Rafael Veiga；Arnaud Dupuis；David Roth
    申请人:Peugeot Citroen Automobiles SA；BorgWarner Inc；
    IPC主号:
    专利说明:

    [0001] The present invention relates to an engine assembly for a motor vehicle comprising an internal combustion engine, a turbocompressor and an exhaust system comprising two exhaust pipes of which the two extensions inside the turbine meet in the turbine.  An extension of one of the two exhaust ducts said exhaust duct through the turbine being in exchange for energy with a wheel of the turbine, a control valve being placed in this extension while an extension of the Another of the two ducts said discharge duct passes through the turbine but bypassing the wheel of the turbine.  The exhaust system of such a motor assembly is connected to an output of the turbocharged engine, also called supercharged engine, for an exhaust gas exhaust from combustion in the engine, the engine being advantageously but not only a four-stroke gasoline engine.  [0003] FIG. 1 shows a supercharged gasoline engine assembly according to the closest prior art described in particular in the document WO-A-2009/105463.  Such an engine assembly is known under the name VEMB, abbreviation of the English name of "Valve Event Modulated Boost", translated into French by supercharging controlled by motor distribution.  This type of engine assembly will be detailed after the general presentation of a conventional supercharged engine and an engine equipped with an exhaust gas recirculation line at the engine intake, also called EGR line.  Referring to Figure 1 for a portion of the elements illustrated in this figure, a thermal combustion engine comprises a cylinder block provided with at least one cylinder, preferably several cylinders and an air intake inlet or an air intake manifold for the gasoline air mixture in each cylinder and an exhaust gas outlet resulting from the combustion of the mixture in each cylinder.  The output of the engine is connected to an exhaust manifold 5 supplying an exhaust duct 4, 9 exhausting the exhaust gases to the outside.  The fact that two exhaust manifolds 5, 7 each with an associated exhaust duct 4, 6 are shown for the engine assembly in Figure 1 is not applicable to any turbocharged engine assembly, such an engine generally comprising only one manifold 5 and a single exhaust duct 4, 9 which passes through a turbine 2.  [0006] The turbocharged engine comprises a turbine 2 and a compressor 3.  The turbine 2 is disposed downstream of the exhaust manifold 5 in the exhaust pipe 4 while the compressor 3 is disposed upstream of the air intake manifold to the engine.  The turbine 2 comprises a turbine wheel recovering at least partially a kinetic energy created in the exhaust gas passing therethrough, the rotary member or wheel of the turbine being rotated by the exhaust gases leaving the exhaust manifold .  The turbine 2 drives the compressor 10 3 by being secured to it by an axis, the compressor 3 is traversed by fresh air for supplying air to the engine, air compressor 3 compresses.  At the outlet of the compressor 3, the air which is then called charge air is supplied by the air supply line to a charge air cooler 25 to cool the air leaving the compressor 3.  On this line is also positioned a throttle valve 26 regulating the flow of air into the air intake manifold of the engine forming the engine air inlet.  On the exhaust side of the engine assembly 1, at the outlet of the turbine 2, the exhaust gas exhausted from the engine enters the exhaust duct 9 of the motor vehicle after passing through the turbine 2 and The exhaust gas cleaning means 10 pass through them, for example one or more catalysts, in particular oxidation, reduction or three-way catalysts, whether or not associated with a particulate filter.  A selective catalytic reduction system or RCS system may also be provided in the exhaust duct 9.  [0009] It is also common to provide an engine assembly with a recirculation line for the exhaust gas to the engine air intake, also called EGR line, such a line being referenced 11 in FIG.  It is indeed known for spark ignition and compression ignition engines to recirculate the exhaust gases to the engine air intake to reduce nitrogen oxide emissions.  Such a system is also known by the Anglo-Saxon acronym EGR 30 for "Exhaust Gas Recirculation" which means Recirculation of Exhaust Gas.  An EGR line 11 has a stitching on the exhaust duct to withdraw a portion of the exhaust gas of the duct and a cooler 23 of the exhaust gas passing through this line 11, these gases then being very hot. .  The line 3037102 3 RGE 11 opens on the intake of air upstream of the compressor 3 it feeds.  A valve 24 called EGR valve equips the EGR line 11, advantageously downstream of the cooler 23 EGR, to open or close the flow of gas to the inlet.  For any type of RGE line 11, the recirculation of the exhaust gases to the air intake of the heat engine makes it possible to improve the thermodynamic efficiency of the engine because of the reduction in heat transfer by reintroduction. of gas recirculated through line EGR 11 into the intake manifold.  Such recirculation may also allow a decrease in enrichment related to the exhaust temperature and a decrease in pump losses when the engine is associated with a turbocharger.  With regard to the reduction of losses by pumping, this has not been entirely satisfactory and the pumping phenomena still persist in the turbine 2.  It has been proposed to use a relief valve inside the turbine.  It was then proposed an exhaust system for a motor-driven supercharger engine with two exhaust pipes as shown in FIG.  The thermal combustion engine forming part of the set 1 said supercharging controlled by engine distribution has at least one cylinder, in Figure 1 three cylinders.  Each engine cylinder is provided with an intake valve and two exhaust valves.  These exhaust valves are selectively associated with a first or second exit passage in a cylinder and selectively open and close their associated passage.  It is the same for the intake valve associated with an inlet passage in each cylinder.  The two outlet passages of each cylinder which are closed and opened sequentially by their associated exhaust valve open on a different exhaust manifold 5, 7, each supplying a dedicated exhaust duct 4, 6, the two ducts 4, 6 exhaust does not follow the same course as it will be detailed below.  The first exhaust passage of each cylinder is connected to the first manifold 5 and the second exhaust passage is connected to the second manifold 7.  A motor assembly 1 said supercharging controlled by engine distribution therefore comprises a first duct 4 said exhaust turbine 2 leaving a first exhaust manifold 5 and a second duct 6 said discharge from a The exhaust manifolds 7, 7 each being respectively connected to one of the two series of first or second exhaust passages provided with their exhaust valves provided for each cylinder.  The first duct 4 leads to an inlet face of the turbine 2 of the turbocharger being extended by a main expansion passage inside the turbine 2 housing a turbine wheel for recovering the kinetic energy. contained in the exhaust gas passing through it.  The second duct 6 bypasses the turbine 2 without penetrating but joins further downstream of the turbine 2 a third duct 9 connected to an outlet face of the turbine 2 for the exhaust gas evacuation of the main expansion passage 10 having has been in exchange for energy with the turbine wheel, so that there is only one exhaust duct 9 passing through the pollution control elements 10 placed at the end of the exhaust system.  It follows that, in such a motor-controlled supercharging engine assembly according to the state of the art, the second duct 6 has no penetrating extension in the turbine 2.  The function of the first duct 4, said turbine exhaust duct, is to allow a first flow of exhaust gas to pass through the turbine 2 and its rotary energy recovery member in the form of a wheel to provide power to the compressor 3.  The function of the second duct 6, said discharge duct and fed by a second exhaust manifold 7, different and independent of the first exhaust manifold 5 of the first duct 4, is to allow a second independent exhaust flow. and different from the first flow to bypass the turbine 2 and in particular its wheel and thus discharge the turbine 2 of the total flow of exhaust gas by decreasing the flow of exhaust gas therethrough by subtraction of the second flow to the total flow.  This makes it possible to discharge and / or control the power of the turbine, as would in a conventional operating condition for regulating the motor load a discharge valve, a previously known element of the state of the art for an engine. turbocharged.  This makes it possible in particular to avoid the pumping phenomenon of the engine consisting essentially of a return of the hot gases to the intake air inlet.  For a conventional turbocharged engine, a discharge valve which may be internal or external to the turbine serves to limit the pressure of the exhaust gas on the turbine wheel of the turbocharger by opening a bypass of the exhaust gas to that they no longer pass through the turbine and its wheel.  A limitation of the speed of the wheel 3037102 5 of the turbine is thus obtained, which also limits the rotational speed of the wheel provided in the compressor being integral with the wheel of the turbine, where also a limitation of the compression of the intake air.  [0020] A relief valve associated with a turbine for regulating the flow of exhaust gas therethrough is no longer necessary with a motor-controlled supercharging engine assembly having two exhaust ducts each starting from a respective exhaust manifold.  [0021] Thus, such an engine assembly makes it possible to improve the efficiency of the engine cycle by reducing the engine pumping during the exhaust phase of a four-stroke cycle, which has a favorable impact on fuel consumption. engine.  Better control of the energy recovered by the turbine is therefore performed, which implies better management of the engine load.  The disadvantage of such an engine assembly is the length of the second duct 6, said discharge duct, which complicates the integration of the exhaust system of such an assembly on the exhaust front of the engine. space available being very small on this facade.  This being done, it is obtained after joining the second duct 6 with the third exhaust duct 9 evacuating the exhaust gas from the turbine 2 a higher temperature of the exhaust gas than that of the exhaust gas 20 passing only through the turbine 2, the flow of exhaust gas passing through the second duct 6 losing significantly less degrees of temperature than the flow of gas passing through the turbine through the main passage of the detent housing the energy recovery wheel of the turbine 2.  This can be combined with other advantages, in particular with regard to the discharge and / or the control of the power of the turbine, as would in a conventional operating condition of regulation of the motor load a valve of discharge, previously known element of the state of the art for a conventional turbocharged engine.  This makes it possible in particular to avoid the pumping phenomenon of the engine consisting essentially of a return of the hot gases to the intake air inlet.  [0025] However, the temperature gain in the depollution elements is not large enough to avoid a long heating period of the exhaust gas depollution elements located downstream of the turbine.  The document EP-B-1 097 298 describes a motor assembly with an exhaust system essentially incorporating all the characteristics previously mentioned for a motor-controlled supercharging engine assembly.  In this document, at least one regulating valve is provided on the first conduit, the valve being able to be arranged upstream of the turbine or downstream of the turbine but still outside the turbine.  However, such an arrangement of the valve outside the turbine creates heat losses of the exhaust gas in the first conduit while increasing the size of the exhaust system especially as the second conduit is 10 forced to bypass the turbine to join the first conduit.  It also follows a loss of heat of the exhaust gases in the second duct due to the length thereof, which is detrimental to obtaining the hottest exhaust gases possible in the system exit zone. exhaust zone, this output zone incorporating the exhaust system depollution elements.  [0028] Therefore, the problem underlying the invention is to improve a motor assembly said supercharged engine controlled by two exhaust pipes allowing to have, as required under certain operating conditions of the engine. engine, the highest possible gas temperature in the exhaust system downstream of the turbine, this by not increasing the size of the exhaust system and minimizing heat losses in the system.  To achieve this objective, there is provided according to the invention an engine assembly comprising an internal combustion engine with at least one cylinder, a turbocharger comprising a turbine and a compressor, and an exhaust system connected to an output of the engine for an exhaust gas exhaust from the combustion in the engine, the exhaust system comprising a first conduit said exhaust by the turbine leaving a first exhaust manifold and a second conduit called discharge starting from a second exhaust manifold, the turbine being provided with a housing having a main expansion passage in which is housed a turbine wheel and the first conduit 30 opening into the main relief passage through an inlet face of the casing, characterized in that the second duct opens through the inlet face of the casing into at least a portion of internal bypass to the casing bypassing the primary passage the main expansion channel and said at least one branch portion joining an outlet side of the casing, the main relief passage comprising, to the interior of the turbine, a flow control valve exhaust gas flowing through it.  The technical effect is to obtain a regulation of the temperature of the gases in the exhaust system downstream of the turbine by a simple and inexpensive means that is a control valve.  In the particular and non-limiting case of improving the heating time of pollution control elements located downstream of the turbine in the exhaust system, as the flow rate is reduced by the control valve in the first duct passing through the turbine wheel, the proportion of exhaust gas expanded in the wheel is lower and the gases passing through the pollution control elements after the junction of the first and second conduits have not mostly been relaxed and therefore keep a high temperature.  This is particularly valid for operating conditions of the engine assembly at low engine speed and low engine load corresponding to a plenum pressure required by a motor control lower than the atmospheric pressure.  It can, however, be easily proceeded to a new opening of the control valve in the first conduit and a quick return to an operation in which a large part of the exhaust gas passes through the turbine and its rotary member.  This can be done by a motor control already present in the motor vehicle, motor control which centralizes all the operating parameters of the motor assembly to control closing or opening of the control valve accordingly.  [0032] Preventing the exhaust gas from passing through the turbine via the turbine wheel into the main expansion passage extending the first duct will considerably reduce the thermal losses of the exhaust gases in the turbine.  At least a small amount of exhaust gas or even no portion of exhaust gas will then pass through the main passage inside the wheel while being in contact with a large heat exchange surface represented by the internal surface of the wheel. turbine wheel, resulting in decreased exhaust gas temperature loss.  With a closed or partially closed control valve, at least a major part of the exhaust gas after the joining of the extensions in the turbine of the first and second ducts will not have undergone any expansion phenomenon in the turbine wheel with decrease temperature and pressure.  Advantageously, the exhaust system comprises a third duct outside the turbine and connected to the outlet face of the turbine casing for exhaust gas discharge out of the turbine.  Advantageously, the control valve is provided with an actuator moving it between at least one first position of closure of the main expansion passage with a zero flow in the main expansion passage and a second fully open position of the relaxing main passage with maximum flow in the main relaxing passage.  [0035] Advantageously, the actuator moves the regulating valve in intermediate opening positions corresponding to different flow rates in the main expansion passage according to the degree of opening corresponding to each respective intermediate position.  Advantageously, the control valve is in the form of a mobile disk 15 in translation or in rotation by the actuator.  Advantageously, the control valve is disposed on at least one outlet end of the main expansion passage at the outlet face of the turbine.  Advantageously, the exhaust system comprises, downstream of the turbine, pollution control elements of the exhaust gas passing therethrough.  The invention also relates to a heating up process of the pollution control elements in such an engine assembly, wherein, the pollution control elements requiring to be heated in order to acquire a predetermined minimum temperature to ensure the treatment of The control valve of the main relief passage maintains the flow of exhaust gas in the main flash passage at a zero or reduced value as long as said minimum temperature is not reached.  Advantageously, a suspensive condition for maintaining the flow of exhaust gas passing through the first duct at a zero or reduced value is that the air intake pressure of the engine is greater than the atmospheric pressure.  The invention also relates to a motor vehicle comprising the engine assembly described above.  Other features, objects and advantages of the present invention will appear on reading the detailed description which follows and with reference to the appended drawings given by way of non-limiting examples and in which: FIG. 1 is a schematic representation of a turbocharged engine-controlled supercharging engine assembly comprising an exhaust system exhaust system according to the closest state of the art; FIG. 2 is a schematic representation of an engine assembly comprising an exhaust system with two exhaust ducts according to the present invention, the turbine being traversed by the two ducts, - Figure 3 is a schematic representation of a longitudinal section of a turbocharger, the turbine of the compressor forming part of the exhaust system of the engine unit according to the present invention and FIG. 4 is a diagrammatic representation in perspective of another embodiment of a turbine provided with a casing, this turbine forming part of the exhaust system of the turbine. FIG. motor assembly according to the present invention by integrating a regulating valve, - Figures 5 and 5a are schematic representations of a view of the outlet face 20 of a turbine provided with a control valve according to Figure 4 , the control valve being shown respectively in the closed position and in the open position in these figures, this turbine forming part of the exhaust system of the engine assembly according to the present invention; - Figure 6 is a diagrammatic representation in perspective of another embodiment of a turbine provided with a casing, this turbine forming part of the exhaust system of the motor assembly according to the present invention and integrating a regulating valve; FIGS. 7 and 7a are diagrammatic representations of a view of the exit face of a turbine provided with a control valve according to FIG. 6, the control valve being shown respectively in the closed position and in the open position; in these figures, this turbine forming part of the exhaust system according to the present invention.  It is to be borne in mind that the figures are given by way of examples and are not limiting of the invention.  They constitute schematic representations of principle intended to facilitate the understanding of the invention and are not necessarily at the scale of practical applications.  In particular, the dimensions of the various elements illustrated are not representative of reality.  Figure 1 has already been described in the introductory part of this patent application.  In what follows the words downstream and upstream are to be taken in the direction of the flow of the exhaust gases out of the engine or again to the engine inlet for the recirculation line, an element in the exhaust system downstream of the engine being further away from the engine than another element upstream of the element.  The so-called engine assembly includes the same engine as its auxiliaries for the intake of air into the engine and for exhausting the gases out of the engine, a turbocharger also forming part of the engine assembly, the turbine being included in the exhaust system of the engine assembly.  Referring to all the figures except Figure 1 and in particular to Figure 2, there is shown a motor assembly of the present invention which incorporates some of the characteristics of a motor assembly of the most recent state of the art. close.  The engine assembly 1 comprises an internal combustion engine with at least one cylinder and a turbocharger comprising a turbine 2 and a compressor 3.  The turbine 2 comprises a wheel recovering at least partially the kinetic energy of the gases passing through it and transmits this energy to the compressor 3.  For this purpose, the turbocharger is provided with an axis connecting the wheel of the turbine 2 to a wheel located in the compressor 3, this member ensuring the compression of the air passing through the compressor 3.  This shaft can be lubricated, cooled by water and / or oil and installed on bearings with or without bearings.  This axis may also be equipped with electrical assistance, either directly on the axis, or with the help of gears, for example a transmission or a gearbox.  The exhaust system is connected to an output of the engine for an exhaust gas exhaust from the combustion in the engine and comprises a first duct 4 said exhaust turbine 2 from a first collector 5 exhaust and a second duct 6 said discharge from a second exhaust manifold 7 30.  The first and second collectors 5, 7 are connected to the output of the internal combustion engine to ensure the ducting of the exhaust gases through the first and second ducts 4, 6.  The engine cylinder or each engine cylinder may have two output passages at its outlet closed by a respective exhaust valve, but this is not required.  The two exhaust manifolds 5, 7 can be close to each other to be connected to the turbine 2, for example by a same exhaust manifold connection flange with a flange provided on a 2c turbine casing 2, the housing 2c being particularly visible in Figures 3 and 6.  The exhaust manifolds 5, 7 may be cooled by a cooling liquid, in particular water, the liquid circulating in a cooling circuit being common or not common to the two collectors 5, 7.  The cooling circuit (s) may also be used for cooling the interior of the turbine 2.  Downstream of the turbine 2, in known manner, it is provided on a third exhaust duct 9 external to the turbine with depollution elements 10 which should be carried and maintained at a minimum operating temperature .  With particular regard to FIGS. 2, 3, 4 and 6, the turbine 2 of the turbocharger 15 is integrated in a casing 2c having at least one inlet face 2a for the exhaust gases of the first and second ducts 4, 6 entering the turbine 2 and an outlet face 2b for the exhaust gases leaving the turbine 2.  The turbine 2 has a main expansion passage 4 'in which is housed a turbine wheel and the first conduit 4 opens into the main relief passage 4' by the inlet face 2a of the housing 2c.  The main relaxation passage 4 'is particularly visible in Figures 3, 4, 6.  Thus, in accordance with the present invention, the second duct 6 opens through the inlet face 2a of the casing 2c in at least one branch portion 8 internal to the casing 2c bypassing the main relief passage 4 ', the main passage 4 'and said at least one branch portion 8 joining an outlet face 2b of the housing 2c, the main expansion passage 4' comprising, inside the turbine 2, a control valve 13 of the flow of exhaust gas passing through it.  Thus, a bypass portion 8 extending the second duct 6 is integrated in the turbine 2 but is not in exchange for kinetic energy with the wheel of the turbine 2, which provides a discharge effect of the turbine 2 more efficient than the discharge effect obtained with a relief valve.  Finally, the higher the flow rate in the second duct 6 with respect to the flow rate in the first duct 4, and the more the exhaust gases leaving the turbine 2 will be hot, which makes it possible to reduce the temperature rise time of the depollution elements 10 located downstream of the turbine.  The regulation valve 13 advantageously makes it possible to reduce and / or close the flow rate in the main expansion passage 4 'extending the first exhaust duct 4 in the turbine 2 and thus to increase the temperature of the gas after joining extensions in the turbine of the first and second conduits 4, 6 that are 5 respectively the main channel of relaxation 4 'and said at least one branch portion.  Crossing the turbine 2 by the extension 4 ', 8 respectively of the two ducts 4, 6 exhaust also provides better thermal insulation of the second conduit 6 in the state of the art.  The shortening of the second duct 6 obtained by passing through the turbine 2 contributes to reducing the temperature loss of the gases passing through the second duct 6.  A secondary advantage of the exhaust system of the engine assembly 1 according to the present invention, because a branch portion 8 extending the second duct 6 is integrated in the turbine 2, is to reduce the size of the exhaust system and reduce the expenditure material for the second conduit 6, the junction of the extension of the first and second conduits 4, 6 being in the turbine 2 and not after the turbine 2, resulting in a shortening of the length of the second duct 6 which does not have to have a length allowing it to bypass the turbine 2.  The main relief passage 4 'and said at least one branch portion 8 respectively extending the first and second conduits 4, 6 can lead to the same level of the turbine 2 to the outlet face 2b of the housing 2c.  The exhaust system may comprise a third duct 9 outside the turbine 2 and connected to the outlet face 2b of the turbine casing 2c for evacuation of the exhaust gases out of the turbine 2.  In the embodiment shown in the figures except in Figure 1, the turbine 2 thus comprises an inlet face 2a for the exhaust gases of the first and second conduits 4, 6 penetrating by their extensions 4 ', 8 in the turbine 2 and an outlet face 2b externally connected to the third conduit 9 external to the turbine 2.  According to a feature of the present invention, the main relief passage 4 'inside the turbine 2 is provided with a regulation valve 13.  This regulating valve 13 can advantageously be located near the outlet face 2b of the turbine 2 by selectively closing or opening an outlet end 4b of the main relief passage 4 ', thus being on the main passage of expansion 4 'after the wheel of the turbine 2.  Regardless of its position on the main expansion passage 4 'extending the first conduit 4, the control valve 13 may be provided with an actuator 15 moving it between at least a first closed position of the main passage 4 'expansion valve with a zero flow in the main expansion channel 4' and a second full open position of the main expansion channel 4 'with a maximum flow in the main expansion channel 4'.  The zero flow in the main expansion channel 4 'may correspond to a heating demand of the pollution control elements 10 while the maximum flow rate in the main expansion channel 4' may correspond to a maximum power demand 10 to the compressor 3 turbocharger.  The actuator 15 can also move the control valve 13 in intermediate positions of opening corresponding to different flow rates in the main channel of relaxation 4 'according to the degree of opening corresponding to each respective intermediate position.  [0063] Advantageously, the control valve 13 may be in the form of a mobile disc in translation or in rotation by the actuator 15.  A rotating disk as a regulating valve 13 is shown in particular in Figures 5, 5a, 7 and 7a.  Referring to all the figures except Figure 1, the branch portion 8 extending the second duct 6 may have an outlet end 8b and the main passage 4 of relaxation 4 first lead 4 may have an outlet end 4b, the two output ends 4b, 8b opening near the outlet face 2b of the turbine 2, that is to say upstream of this outlet face 2b in the turbine 2.  The third duct 9, external to the turbine 2, leaves the outlet face 2b for exhaust gas discharge from the turbine 2.  Conventionally, the third duct 9 further comprises downstream of the outlet face 2b of the casing 2c of the turbine 2 of the decontamination elements 10 of the exhaust gas passing therethrough, these depollution elements 10 having been mentioned previously.  It should be considered that there may exist simultaneously several bypass portions 8 extending the second duct 6 said discharge and a bypass portion 8 may have several outlet ends 8b.  FIGS. 3, 3a, 4, 5 and 5a show a single outlet end 8b for a branch portion 8 while FIGS. 6, 7a and 7b show several outlet ends 8b for one or more branch portions 8.  The main expansion channel 4 'extending the first duct 4 may also have an outlet end 4b at the place where the main relief passage 4' and the branch portion or portions 8 meet.  The outlet end 4b of the main relief passage 4 'may have a larger section than the section of the or an outlet end 8b of the at least one branch portion 8, but this is not required.  The outlet end 4b of the main relief passage 4 'is advantageously of circular section, which is however not limiting.  For example, the at least one branch portion 8 may comprise at least two output ends 8b.  This is illustrated in particular in Figures 6, 7 and 7a.  Multiple outlet ends 8b for the branch portion 8 extending the second discharge duct 6 may be in a plane parallel to or coincident with that of the outlet face 2b of the turbine 2.  In a first embodiment of the nonlimiting invention, the two or more output ends 8b of a bypass portion 8 may be adjacent to each other in the turbine 2, which is not shown in the figures.  Alternatively, in a second embodiment of the invention which is also non-limiting, the two exit ends 8b of the at least one branch portion 8 may be uniformly distributed on an outlet disk disposed around the outlet end 4b of the The main detent passage 4 'then lies in the center of the disc, which is shown in Figures 6, 7a and 7b.  The two or more outlet ends 8b of said at least one bypass portion 8 may open radially or axially with respect to the outlet end 4b of the first duct 4.  A radial outlet with a uniform distribution makes it possible to optimize the configuration of the casing 2c and the associated turbine 2 as well as an optimization of the turbulences in the outlet face 2b of the casing 2c of the turbine 2.  In this embodiment, the two or more output ends 8b of the at least one branch portion 8 may be at least three in number, all opening radially or axially or a portion of the outlet ends 8b opening radially with a complementary portion of the other output ends 8b 8b opening axially.  This is shown in Figures 6, 7 and 7a.  With a second duct 6 said discharge extended in the turbine 2 by one or more bypass portions 8, themselves having one or more exit ends 8b and a main passage of relaxation 4 'extending the first duct 4 said In the case of a turbine exhaust pipe provided with an outlet end 4b, the section of the outlet ends 8b, 4b can take several different forms, for example: a round shape such as, for example, in a conventional system of turbocharger, 5 - an optimized form for the optimization of the turbine assembly 2 and its associated casing 2c and the turbulence optimization in the outlet face 2b of the turbine 2, for example a crescent shape, in a half-moon , an oval, square, rectangular, triangular shape, etc.  In one embodiment of the invention, the output of the engine may comprise 10 per cylinder, at least one cylinder equipping the engine and advantageously three, first and second output passages closed by a respective exhaust valve, a series of first output passages of the cylinders supplying, via the first outlet manifold 5, the first exhaust duct 4 by turbine and a series of second outlet passages, via the second outlet manifold 7, supplying the second leads 6 says discharge.  Thus, it is possible to obtain multiple regulations of the exhaust gas streams.  Under specific operating conditions of the engine assembly 1, it is advantageous to close or reduce the flow of exhaust gas in the main expansion passage 4 'of the turbine 2.  This is done by at least partially closing the control valve 13 according to the present invention.  It may be possible in addition to regulate the flow in the first duct 4, to regulate that of the second duct 6, which allows improved operation of the motor assembly.  [0075] It will now be stated of the first specific operating conditions of the engine assembly 1, for which it is advantageous to close or reduce the flow of exhaust gas through the regulating valve 13 in the main relief passage. 4 'extending the first conduit 4.  As previously mentioned, the exhaust system comprises, downstream of the turbine 2, elements 10 for cleaning up the exhaust gases passing through it, this in the third duct 9.  These depollution elements 10 need to be heated by passing through the hottest possible exhaust gases in order to acquire as quickly as possible a predetermined minimum temperature to ensure the treatment of depollution.  This is important especially during the period of time following the start of the motor vehicle.  It is advantageous to close or reduce the flow of exhaust gas in the main passage of relaxation 4 'extending the first conduit 4, this stream losing a lot of heat in the wheel of the turbine 2 and then being less hot that the flow of the second duct 6 having bypassed the turbine 2.  The invention therefore also relates to a heating up process of the pollution control elements 10 in the exhaust system of a motor assembly described above, in which the control valve 13 maintains the exhaust gas flow rate. in the main expansion channel 4 'internal to the turbine 2 to a zero or reduced value until said minimum temperature is reached.  In the method according to the present invention, there may be a suspensive condition for maintaining the flow of exhaust gas in the main expansion channel 4 'at a zero or reduced value which is that the air intake pressure the motor is greater than the atmospheric pressure.  This corresponds to a power demand of the motor unit 1.  [0080] In an accessory manner, as shown in FIG. 2, an EGR line may be connected by a tap 12 to one of the two ducts 4, 6 or to one of their respective extensions in the turbine 2.  In Figure 2, there is shown a tapping 12 of a line RGE 11 20 through the turbine 2 either with the main expansion channel or with at least one branch portion 8 or with both.  As previously mentioned, the turbine 2 may be equipped with a cooling circuit by a coolant in its interior, including water.  This circuit is not illustrated in the figures but by taking again the figures 2 to 7a for the references of the other elements, the cooling circuit can extend inside the casing 2c at least around the inlet face 2a. and around the wheel of the turbine 2.  The cooling liquid advantageously circulates on all the hot zones where a melting risk of the material of the casing 2c of the turbine 2 is identified.  The circulation of the coolant is generally in a single direction by realizing the whole of the tower 2c of the turbine 2, mainly in the area of an inlet flange of the turbine 2 and in the area around the wheel of the turbine 2.  Several preferred embodiments of the cooling circuit are possible.  Thus, when the first manifold 5 or the second exhaust manifold 7 comprises a cooling circuit, its cooling circuit can be connected to the cooling circuit of the turbine 2, with an inlet and an outlet of the cooling circuit of the turbine 2 can be on the inlet face 2a of the turbine 2.  In another mode, the cooling circuit of the turbine 2 is independent of that of each exhaust manifold 5, 7 and is clean to it.  It is also possible for the turbine to be directly connected to the exhaust manifolds 5, 7, the first and second ducts 4, 6 then being integrated in their respective manifolds 5, 7.  The invention is in no way limited to the described and illustrated embodiments which have been given by way of example only.
    权利要求:
    Claims (10)
    [0001]
    1. An engine assembly (1) comprising an internal combustion engine with at least one cylinder, a turbocharger comprising a turbine (2) and a compressor (3), and an exhaust system connected to an output of the engine for a evacuation of exhaust gas from the combustion in the engine, the exhaust system comprising a first duct (4) said exhaust by the turbine (2) from a first collector (5) exhaust and a second conduit (6) said discharge from a second exhaust manifold (7), the turbine (2) being provided with a housing (2c) having a main relief passage (4 ') in which is housed a turbine wheel and the first duct (4) opening into the main expansion passage (4 ') through an inlet face (2a) of the casing (2c), characterized in that the second duct (6) opens out from the face inlet (2a) of the housing (2c) in at least one branch portion (8) internal to the housing (2 c) bypassing the main relief passage (4 '), the main relief passage (4') and the said at least one branch portion (8) joining an outlet face (2b) of the housing (2c), the main expansion passage (4 ') comprising, inside the turbine (2), a control valve (13) of the flow of exhaust gas therethrough.
    [0002]
    2. The assembly of claim 1, wherein the exhaust system comprises a third conduit (9) outside the turbine (2) and connected to the outlet face (2b) of the turbine housing (2c) for evacuation exhaust gases out of the turbine (2).
    [0003]
    3. An assembly according to claim 1 or 2, wherein the control valve (13) is provided with an actuator (15) moving it between at least a first closed position of the main expansion passage (4 ') with a flow rate. zero in the main expansion channel (4 ') and a second full open position of the main expansion channel (4') with a maximum flow rate in the main expansion channel (4 ').
    [0004]
    4. The assembly of claim 3, wherein the actuator (15) moves the control valve (13) in intermediate positions of opening corresponding to different flow rates in the main relief passage (4 ') according to the degree of opening corresponding to each respective intermediate position. 3037102 19
    [0005]
    5. An assembly according to any one of claims 3 or 4, wherein the control valve (13) is in the form of a disk movable in translation or rotation by the actuator (15).
    [0006]
    6. An assembly according to any one of claims 1 to 5, wherein the regulating valve (13) is disposed on at least one outlet end (4b) of the main expansion passage (4 ') at the exit face. (2b) of the turbine (2).
    [0007]
    7. An assembly according to any one of claims 1 to 6, wherein the exhaust system comprises, downstream of the turbine (2), pollution control elements (10) of the exhaust gas therethrough. 10
    [0008]
    A method of heating up the abatement elements (10) in an assembly according to claim 7, wherein the abatement elements (10) need to be heated in order to acquire a predetermined minimum temperature for the treatment of the control valve (13) of the main expansion passage (4 ') maintains the flow of exhaust gas in the main expansion passage (4') at a zero or reduced value as long as the said minimum temperature is not reached.
    [0009]
    9. The method of claim 8, wherein a suspensive condition for maintaining the flow of exhaust gas in the main vent (4 ') to a zero or reduced value is that the air intake pressure of the engine is Above atmospheric pressure.
    [0010]
    10. Motor vehicle, characterized in that it comprises the assembly according to one of claims 1 to 7.
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    同族专利:
    公开号 | 公开日
    US20180171845A1|2018-06-21|
    EP3303798A1|2018-04-11|
    WO2016193598A1|2016-12-08|
    FR3037102B1|2019-11-22|
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    DE102010029109A1|2010-05-19|2011-11-24|Robert Bosch Gmbh|Driving apparatus i.e. combustion engine, operating device for motor car, has waste gate valve comprising valve flap that releases bypass channel and closes inlet and exhaust passages of turbine simultaneously in respective position|
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    JP5528528B2|2012-11-22|2014-06-25|三菱電機株式会社|Control device and control method for internal combustion engine|US10787949B2|2018-12-31|2020-09-29|Ford Global Technologies, Llc|Systems and method for an exhaust port arrangement of a split exhaust system|
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    US10954867B2|2019-06-07|2021-03-23|Ford Global Technologies, Llc|Methods and systems for estimating a composition of flow through a scavenge exhaust gas recirculation system of a split exhaust engine system|
    US10900405B2|2019-06-07|2021-01-26|Ford Global Technologies, Llc|Methods and systems for estimating a flow of gases in a scavenge exhaust gas recirculation system of a split exhaust engine system|
    US10947932B2|2019-06-24|2021-03-16|Ford Global Technologies, Llc|Methods and systems for adjusting a flow of gases in a scavenge exhaust gas recirculation system of a split exhaust engine system|
    法律状态:
    2016-05-24| PLFP| Fee payment|Year of fee payment: 2 |
    2016-12-09| PLSC| Search report ready|Effective date: 20161209 |
    2017-05-23| PLFP| Fee payment|Year of fee payment: 3 |
    2018-05-25| PLFP| Fee payment|Year of fee payment: 4 |
    2018-06-29| CA| Change of address|Effective date: 20180312 |
    2018-06-29| CD| Change of name or company name|Owner name: PEUGEOT CITROEN AUTOMOBILES SA, FR Effective date: 20180312 Owner name: BORGWARNER INC., US Effective date: 20180312 |
    2019-05-22| PLFP| Fee payment|Year of fee payment: 5 |
    2020-05-20| PLFP| Fee payment|Year of fee payment: 6 |
    2021-05-19| PLFP| Fee payment|Year of fee payment: 7 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1554986A|FR3037102B1|2015-06-02|2015-06-02|TURBOCOMPRESSED ENGINE ASSEMBLY WITH TWO EXHAUST DUCTS AND CONTROL VALVE|
    FR1554986|2015-06-02|FR1554986A| FR3037102B1|2015-06-02|2015-06-02|TURBOCOMPRESSED ENGINE ASSEMBLY WITH TWO EXHAUST DUCTS AND CONTROL VALVE|
    US15/575,296| US20180171845A1|2015-06-02|2016-05-27|Turbocharged Engine Assembly With Two Exhaust Pipes And Regulating Valve|
    EP16733644.5A| EP3303798A1|2015-06-02|2016-05-27|Turbocharged engine assembly with two exhaust pipes and regulating valve|
    PCT/FR2016/051275| WO2016193598A1|2015-06-02|2016-05-27|Turbocharged engine assembly with two exhaust pipes and regulating valve|
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