FR2857417A1 - INTAKE CIRCUIT FOR SUPERCURRENT PARTICLE FILTER ENGINE - Google Patents

Abstract

The invention proposes an intake circuit comprising a distribution housing (30) which comprises a first input (E1) connected to said output of a motor boosting device, a first output (S1) connected to a control duct. intake of the engine, a second output (S2) connected to the supercharged air cooling circuit, and a second input (E2) connected to this cooling circuit, and a controlled member (V) which is mounted movably inside. the housing (30) between a first position communicating the first input (E1) with the first output (S1) and the second input (E2) with the second output (S2), and a second position communicating the first input (E1) with the second output (S2) and the second input (E2) with the first output (S1).

Description

"Intake circuit for supercharged engine with particle filter

  The present invention relates to an intake circuit of a supercharged engine more particularly adapted to the regeneration of a particulate filter.

  The invention relates more particularly to a gas intake circuit, in particular air, in a motor vehicle combustion engine of the type comprising at least one intake duct in a cylinder of the engine and at least one duct of exhaust gas out of the cylinder which is connected to an inlet of a supercharger whose output is connected to said intake duct via a distribution housing.

  For some rotational speeds of an internal combustion engine, it is found that it is more difficult to introduce a larger intake air mass in the cylinders.

  Consequently, for a given richness of the air-fuel mixture and for a given temperature of the air introduced into a cylinder, it is difficult to improve the engine performance.

  It must also be possible to ensure regularly and under optimal conditions the regeneration of the particulate filter.

  The particulate filter requires, during certain operating phases of the engine to divert all or part of the air of the supply circuit so as to increase the temperature of the air admitted into the cylinder. This results in obtaining an increase in the temperature of the exhaust gas which is necessary for efficient regeneration of the particulate filter.

  Moreover, by its reciprocating movement, the piston creates fluctuations or pulsations of pressure in the intake line.

  This results in disturbances which are at the origin of pulsating phenomena which are manifested by overpressures or depressions, the aim being to generate an overpressure in the cylinder at the beginning and at the end of the opening of one or more valves. intake cylinder.

  These pulsations make it possible to increase the air mass enclosed in the cylinder and, consequently, to improve the performance of the engine.

  These overpressures are obtained for certain rotational speeds of the engine by optimizing: - the laws of lifting (s) of the valves; the length of the duct or ducts which extend between a determined valve and a so-called reflection cavity or volume; the volume of the reflection cavity and the section jump at the connection with this cavity; etc. The cavity or reflection volume may advantageously be constituted by the supercharging air cooling circuit comprising in particular a heat exchanger or air cooler.

  The aim of the invention is to propose a design which makes it possible to simply realize the two possibilities of having a capacity or volume of reflection and of being able to short-circuit it, with simple, inexpensive and compact means.

  For this purpose, the invention proposes a circuit of the type mentioned above, characterized in that the distribution box comprises a first input connected to said output of the supercharging device, a first output connected to said intake duct, a second connected output to another circuit, and a second input connected to this other circuit, and at least one controlled member which is mounted movably inside the housing between: - at least a first position putting in communication, on the one hand, the first entrance with the first exit and, secondly, the second entrance with the second exit; and at least a second position communicating, on the one hand, the first input with the second output and, on the other hand, the second input with the first output.

  The reflection cavity advantageously belongs to a cooling circuit of the supercharging gases, or to several circuits in series or in parallel.

  The supercharging device is in particular a turbocharger.

  The invention also aims to optimize the space in the vehicle by combining the reflection volume and the flaps or movable flaps.

  Overall, in the regeneration phase of the particulate filter, the cooling circuit of the charge air is short-circuited by interrupting the communication between the second output and the second input.

  In so-called engine performance phase at full load, it promotes the flow through the charge air cooling circuit and using the housing as volume or reflectivity, establishing the communication between the second output and the second. Entrance.

  According to other characteristics of the invention: in said first position of the movable member, the first input is isolated from the second output and the first output is isolated from the second input, and in said second position of the device mobile, the first input is isolated from the first output and the second input is isolated from the second output; the housing comprises a single chamber to which the first input, the first output, the second input, and the second output are connected, and the said movable member is a single distribution flap which divides the said single chamber into two parts of variable configuration and which is movably mounted between said first and second positions; in said first position of the movable member, the first input is connected to the second output and the first output is connected to the second input, and in the second position of the mobile device, the first input is isolated from the first input; exit and the second entrance is isolated from the second exit; the housing comprises a main fixed partition which divides it into a first chamber, to which are connected the first input and the second output, and a second chamber, to which are connected the second input and the first output, and the fixed partition. comprises a main orifice whose opening is controlled by a shutter-controlled main shutter which is movably mounted between said first and second positions; the circuit comprises a first controlled secondary shutter of the second output; the circuit comprises a second controlled secondary shutter of the second input; the housing comprises: a first secondary partition which divides the first chamber into a first sub-chamber to which the first entrance is connected and into a second sub-chamber to which the second exit is connected, and which comprises a first secondary orifice of which the opening is controlled by a first shutter controlled secondary shutter; 25. and a second secondary partition which divides the second chamber into a first sub-chamber to which is connected the first outlet and into a second sub-chamber to which is connected the second inlet, and which comprises a second secondary orifice of which the second opening is controlled by a second shutter controlled secondary shutter; and said main orifice, the opening of which is controlled by the shutter-controlled main shutter, is arranged in the partition separating said first sub-chambers.

  Other characteristics and advantages of the invention will appear on reading the detailed description which follows for the understanding of which reference will be made to the appended drawings in which: FIG. 1 is a schematic view which illustrates an engine with its circuit intake device comprising a distribution box according to the invention; FIG. 2 is a diagrammatic view which illustrates in section a first embodiment of the distribution box according to the invention which is shown with its single movable distribution flap in its first functional position - FIG. 3 is a view similar to FIG. that of the previous figure with the distribution flap in its second functional position; is - Figure 4 illustrates a second embodiment of a distribution housing according to the invention which comprises a fixed partition which divides it into two chambers, and a single main shutter; FIG. 5 is a view similar to the previous one which illustrates a first variant of the second embodiment with a first secondary shutter of the second outlet of the housing; Figure 6 is a view similar to the previous one which illustrates a second variant of the second embodiment with a second secondary shutter of the second inlet of the housing; FIG. 7 is a view similar to that of FIGS. 4 to 6 which illustrates a third variant of the second embodiment with a first secondary shutter of the second outlet of the housing and a second secondary shutter of the second housing entrance; - Figure 8 is a view similar to that of Figure 4 which illustrates a third variant of the second embodiment of the housing divided into four sub-chambers and which comprises a main shutter and two shutter secondary shutters.

  FIG. 1 shows a circuit 10 for admitting gases into a combustion engine 12 of a motor vehicle which is, for example, a spark ignition internal combustion engine or a diesel in which the gases admitted to the cylinders 16 are combustion air or for example an air-fuel mixture.

  In known manner, the circuit 10 comprises a distributor 14 for the admission of gases into the cylinders 16 and an exhaust manifold 18, each cylinder 16 comprising, in known manner, one or more intake valves and one or several exhaust valves (not shown).

  The exhaust manifold 18 is connected by a conduit 20 to the turbine 22 of a turbocharger 24 for supercharging the pressure of all or part of the gases admitted into the cylinders 16.

  The turbocharger 24, of known general structure, comprises a compressor 26 whose compressed gas outlet is connected, via a conduit 28, to the first input first input El of a controlled distribution housing 30.

  The housing 30 has a first output SI which is connected via a duct 32 to the inlet of the inlet distributor 14.

  The housing 30 also has a second outlet S2 which is connected via a duct 34 to the inlet of a circuit 36 for cooling the compressed air by the compressor 26.

  Within the meaning of the invention, the circuit 36 for cooling the compressed air constitutes the so-called reflection cavity.

  Finally, the housing 30 includes a second inlet E2 which is connected, via a duct 38, to the outlet of the circuit 36 for cooling the compressed air by the compressor 26.

  After passing, for all or part, the turbine 22, the exhaust gas is discharged through an exhaust circuit 40 in which is arranged at least one so-called "depollution" device 42 which is for example a particulate filter.

  In the first embodiment shown in Figures 2 and 3, the housing 30 is a cylindrical casing housing 44 which defines a single internal chamber C within which is pivotally mounted a single V distribution flap.

  The flap V extends in a diametrical plane and cooperates sealing material with the inner concave cylindrical face of the chamber C. The distribution flap is capable of occupying the first angular position illustrated in FIG. 2 in which it is in position. sealing abutment against two first angular stops 46 and in which the first input E1 is in communication with the first output SI through the first part or half (upper considering FIG. 2) of the chamber C, and in which the second input E2 is in communication with the second output S2 through the second or half (lower) portion of the chamber C. In this first position of the flap V corresponding to the regeneration phase of the particle filter 42, the reflection cavity 36 is short. circuit and the compressed air from the compressor 26 is not cooled.

  The distribution flap V is also capable of occupying the second angular position illustrated in FIG. 3 in which it is in sealing abutment against two second angular stops 48 and in which the first first input input E1 is in communication with the second output S2. through the first or half portion (left considering Figure 3) of the chamber C, and wherein the second input E2 is in communication with the first output S1 through the second half (right) of the chamber C. In this second position of the shutter V corresponding to a phase of use with high performance of the engine, the compressed air by the compressor 26 is cooled through the cooling circuit 36 of the compressed air before being introduced into the distributor admission 14.

  This embodiment has the advantage of using only one controlled mobile flap.

  In the second embodiment of FIG. 4, the envelope 44 is rectangular in shape and is divided by a fixed partition 50 into a first chamber C1 to which the first input E1 and the second output S2 are permanently connected, and a second chamber C2 to which the second input E2 and the first output S1 are permanently connected.

  The fixed partition 50 comprises a main orifice 52 which connects the two chambers C1 and C2 in which is mounted a controlled shutter which is here embodied in the form of a pivoting main shutter flap V which is capable of occupying the first position illustrated in Figure 3 in which the main port 52 is open.

  Thus, in this open position of the flap V corresponding to the regeneration phase of the particle filter 42, the first input E1 is connected to the first output S1 and the second input E2 is connected to the second output S2.

  The flap V is also capable of occupying a second position, not shown, closed in which it closes the orifice 52 of the partition 50.

  In this second position corresponding to a phase of use with high performance of the engine, the first input El is connected to the only second output S2, and the second input E2 is connected only to the first output IF. The compressed air by the compressor 26 is cooled through the cooling circuit 36 of the compressed air, before being introduced into the inlet distributor 14.

  This embodiment also has the advantage of calling only one controlled mobile flap.

  In the first variant shown in FIG. 5, compared with FIG. 4, the housing 30 comprises a first controlled secondary shutter V1 of the second outlet S2 which is shown in the closed position in FIG.

  It is thus possible, during the regeneration phase of the particle filter 42 illustrated in FIG. 5 in view of which the main flap V is open and the first secondary flap V1 is closed, to short circuit the cooling circuit 36. the air of supercharging.

  During the high performance operation phase (not shown) of the engine for which the main shutter V is closed and the first secondary shutter V1 is open, the housing 30 is in the same configuration as that of FIG. secondary component.

  The size of the housing is reduced and the two flaps V and V1 can be controlled by a single electric motor (not shown).

  In the second variant shown in FIG. 6, compared with FIG. 4, the housing 30 comprises a second controlled secondary shutter V2 of the second inlet E2 which is shown in the closed position in FIG. 6.

  It is thus possible, during the regeneration phase of the particle filter 42 illustrated in FIG. 6 for which the main shutter V is open and the second secondary shutter V2 is closed, to short circuit the cooling circuit 36 of the air of supercharging.

  During the high performance operation phase (not shown) of the engine for which the main shutter V is open and the second secondary shutter V2 is open, the housing 30 is in the same configuration as that of FIG. secondary component.

  The size of the housing is reduced and the two flaps V and V2 can be controlled by a single electric motor (not shown).

  In the third variant shown in FIG. 7, compared with FIG. 4, the housing 30 comprises a first controlled secondary shutter V1 of the second outlet S2, which is shown in the closed position in FIG. 7, and comprises a second shutter V2 secondary controlled shutter of the second input E2 which is shown in the closed position in Figure 7.

  It is thus possible, during the regeneration phase of the particle filter 42 illustrated in FIG. 7 in view of which the main shutter V is open and the first and second secondary V1 and V2 shutters are closed, to short circuit 36 cooling the charge air.

  During the high performance operation phase (not shown) of the engine for which the main shutter V is open and the first and second secondary V1 and V2 shutters are closed, the housing 30 is in the same configuration as that of Figure 4 without secondary flap.

  The three flaps V, VI and V2 can be controlled by a single electric motor (not shown).

  Finally, in the third variant embodiment shown in FIG. 8, in addition to the fixed partition 50, the housing 30 includes a first horizontal partition 54 which divides the first chamber C1 into two upper sub-chambers CM to which the first entrance El is connected. and lower C "1 to which is connected the second output S2.

  The fixed partition 54 has a first secondary orifice 55 which connects the two sub-chambers C'1 and C "1 in which is mounted a controlled shutter which is here produced in the form of a first pivoting secondary shutter VI which is likely to occupy the first position illustrated in Figure 8 in which the orifice 55 is closed.

  The housing 30 also has a second horizontal partition 56 which divides the second chamber C2 into two upper sub-chambers C'2 to which is connected the first output S1 and lower C "2 to which is connected the second input E2.

  The fixed partition 56 comprises a second secondary orifice 57 which connects the two sub-chambers C'2 and C "2 in which is mounted a controlled shutter which is here made in the form 11 of a second pivoting secondary shutter V2 shutter which is likely to occupy the first position illustrated in Figure 8 in which the orifice 57 is closed.

  It is thus possible, during the regeneration phase of the particle filter 42 illustrated in FIG. 8 in view of which the main shutter V is open and the first and second secondary V1 and V2 shutters are closed, to short circuit the circuit 36 cooling the charge air. The air coming from the compressor 26 goes directly to the motor 12 via the input 1E, the zones C1, then C'2 and the output SI. The acoustic performance is provided by the C'2 zone thanks to its large volume and the section jump.

  During the phase (not shown) of high-performance use of the engine for which the main shutter V is open and the first and second VI and second V2 secondary shutters are open, the housing 30 is in the same configuration as that of the Figure 4 without secondary flap. The air arrives from the compressor 26 via the inlet E1 and passes through the zone C1, then goes through the zone C "1 and the outlet 2S to the inlet of the cooling circuit 36 via the shutter VI which is open. Next, the air cooled by the circuit 36 returns to the zone C "2 through the inlet 2E and passes through the flap V2 which is open, to finally cross the zone C'2 and the flow exits through the outlet 1S. Dispatcher direction 14.

  To ensure good filling performance, it is necessary that the volume of the C'2 zone is large, for example of the order of 3 liters and a section break exists between the C'2 zone and the duct 18 which leads to the intake manifold 14.

  The three flaps V, VI and V2 can be controlled by a single electric motor (not shown).

  According to the different embodiments and variants, the control strategies of the controlled shutter (s) may depend on: - in open-loop operation, different operating parameters of the engine (speed, accelerator pedal position, pressures, temperatures, etc.) and detecting the angular position of the flap (s); - In closed loop operation, information representative of the position of the shutter.

Claims (10)

  1. Circuit (10) for admitting gases, in particular air, into a motor vehicle combustion engine (12) of the type comprising at least one inlet duct (32, 14) in a cylinder (16) of the engine and at least one gas exhaust duct (20) out of the cylinder which is connected to an inlet of a supercharging device (24) having an outlet (28) connected to said intake duct via a housing (30) for distribution, lo characterized in that the housing (30) distribution comprises a first input (El) connected to said output of the supercharging device (24, 26, 28), a first output (SI) connected to said intake duct (32, 14), a second output (S2) connected to another circuit (36), and a second input (E2) connected to this other circuit (36), and at least one controlled device ( V, VI, V2) which is mounted movably inside the housing (30) between: - at least a first position placing in communication, on the one hand, at first input (E1) with the first output (S1) and secondly at the second input (E2) with the second output (S2); and at least a second position putting in communication, on the one hand, the first input (El) with the second output (S2) and, on the other hand, the second input (E2) with the first output (SI) .   2. Intake circuit according to the preceding claim, characterized in that, in said first position of the movable member, the first input (El) is isolated from the second output (S2) and the first output (SI) is isolated of the second input (E2), and in that in said second position of the movable member, the first input (El) is isolated from the first output (SI) and the second input (E2) is isolated from the second output (S2).   3. Intake circuit according to the preceding claim, characterized in that the housing (30) comprises a single chamber to which are connected the first input (El), the first output (SI), the second input (E2), and the second output (S2), and in that said movable member is a single distribution flap (V) which divides said single chamber (C) into two parts and which is movably mounted between said first and second positions.   4. Intake circuit according to claim 1, characterized in that, in said first position of the movable member, the first inlet (El) is connected to the second outlet (S2) and the first outlet (SI) is connected at the second input (E2), and in that in said second position of the movable member, the first input (El) is isolated from the first output (SI) and the second input (E2) is isolated from the second output (S2).   An intake circuit according to Claim 4, characterized in that the housing (30) has a main fixed partition (50) which divides it into a first chamber (C1), to which the first input (E1) is connected and the second output (S2), and a second chamber (C2), to which the second input (E2) and the first output (S1) are connected, and in that the fixed partition comprises a main orifice (52) of which the opening is controlled by a shutter-controlled main shutter (V) which is movably mounted between said first and second positions.   6. Intake circuit according to any one of claims 4 or 5, characterized in that it comprises a first secondary flap (VI) controlled shutter of the second output (S2).   7. Intake circuit according to any one of claims 4 or 5, characterized in that it comprises a second secondary flap (V2) controlled shutter of the second input (E2).   8. Intake circuit according to claim 5, characterized in that the housing (30) comprises: - a first secondary partition (54) which divides the first chamber (C1) into a first sub-chamber (C'1) to to which is connected the first input (El) and a second sub-chamber (C "1) to which is connected the second output (S2), and which has a first secondary orifice (55) whose opening is controlled by a first closed secondary shutter (VI) and a second secondary partition (56) which divides the second chamber (C2) into a first sub-chamber (C'2) to which is connected the first output (SI) and in a second sub-chamber (C "2) to which is connected the second input (E2), and which comprises a second secondary orifice (57) whose opening is controlled by a second secondary flap (V2) controlled by shutter; and in that said main orifice (52) whose opening is controlled by the shutter-controlled main shutter (V) is arranged in the partition (50) separating said first sub-chambers (C'1, C'2) .   9. Intake circuit according to any one of the preceding claims, characterized in that said other circuit is a circuit (36) for cooling the supercharging gases.   Intake circuit according to one of the preceding claims, characterized in that the supercharging device (24) is a turbocharger (22, 26).