FR2923886A1 - Valve e.g. three-way valve, for air supplying circuit of e.g. heat engine, in motor vehicle, has rotary unit moved inside body in manner to control passage of air via openings with rule defined according to angular position of rotary unit - Google Patents

Abstract

The valve (30) has a body (32) comprising an entirely open bottom surface (44), a side wall (42) and three inlet or outlet openings (36-40). The opening (36) is formed on the bottom surface. The other two openings (38, 40) are formed on the side wall. A rotary unit (34) is moved inside the body in a manner to control passage of air through the openings (38, 40) with a rule defined according to an angular position of the rotary unit in the body. The rotary unit has a rotation axis, in which the openings (38, 40) comprise an elongated shape along the rotation axis. An independent claim is also included for a method for controlling an engine using an air supplying circuit.

Description

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The invention relates to a valve for an air supply circuit for a motor vehicle engine, a circuit comprising such a valve and a method for controlling an engine using such a circuit. motor vehicle engine.

Air is understood to mean both supercharged air from a compressor or turbo compressor as a mixture of charge air and recirculated exhaust gas.

The invention relates more particularly to a valve 15 comprising at least one body and a rotary member.

The new regulations in terms of pollutant emission and the willingness of manufacturers to reduce the consumption of motor vehicle engines entail the need for a finer management of the so-called engine intake heat.

It is thus known to equip an air supply circuit of a motor vehicle engine with a branch 25 comprising a heat exchanger, more particularly a charge air cooler, and a bypass branch of this heat exchanger. Such circuits are generally provided with several actuators distributing the air in each branch. The number of actuators to be installed on the circuit as well as their complex technology entails a cost of manufacturing the large circuit and generates delicate management of the various actuators by the electronic control systems of the engine of the motor vehicle.

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The invention aims to improve the situation.

For this purpose, the invention proposes a valve comprising at least one body and a rotary member. According to the invention, the body comprises at least one bottom face, a side wall and at least three openings which are respectively called first, second and third openings. The first opening is located on the bottom face and the second and third openings are located on the side wall. The rotating member is movable within the body so as to control the passage of air through the second and third openings with a defined law depending on the angular position of the rotating member in the body.

A valve according to the invention is therefore a component comprising a single rotary member and a single motor. It is therefore of simplified design compared to the actuators of the prior art. This valve allows, in addition and in a single component, to be able to manage the opening / closing functions of the openings on the side wall and flow rate of the air passing through them.

The invention also proposes an air supply circuit of a motor vehicle engine and a method of controlling an engine using such a circuit.

Other advantages and characteristics of the invention will appear better on reading the description by way of illustration and without limitation of examples from the figures in the accompanying drawings in which:

Figure 1A schematically shows a circuit 35 for supplying air to a motor vehicle engine.

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Figure 1B schematically shows an air supply circuit of a motor vehicle engine according to another embodiment of Figure 1A.

FIG. 2A represents a side view of a valve according to the invention.

Figure 2B shows a perspective view of a valve according to the invention. Figure 3 shows a sectional view of the valve along the axis 3-3 shown in Figure 2A.

Figure 4 shows a perspective view of a rotational member of a valve according to the invention.

FIG. 5 represents a perspective view of a plug of the rotary member of FIG. 5.

Fig. 6 is a perspective view of a sealing segment of the rotary member of Fig. 5.

Figures 7 to 12 show a sectional view along the axis 4-4 of Figure 2A of a valve according to the invention at different stages of its use.

As illustrated in FIGS. 1A and 1B, the invention relates to an air supply circuit, for example outside air AE, or an intake air circuit 16 of a thermal engine 10. The engine comprises a intake manifold 1 and an exhaust manifold 2 and may be, for example, a motor vehicle engine. This circuit 16 comprises a compressor 18 and a heat exchanger 20. The heat exchanger 20 is here a supercharging air cooler. The heat exchanger is placed on a 10

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branch of the circuit said exchange branch 26. The circuit is connected to the intake manifold 1 of the engine.

The compressor 18 is driven by a turbine 22 disposed in an exhaust circuit from the exhaust manifold 2 of the engine and adapted to be driven by the exhaust gas from the engine.

The outside air AE at atmospheric pressure is thus compressed by the compressor 18, cooled by the charge air cooler 20 via the so-called exchange branch 26 before entering the heat engine through the collector. admission 1. Charge air or supercharged air is the outside air that has passed through the compressor.

The intake circuit 16 further comprises a bypass or said bypass branch 12 which allows a passage of the charge air directly to the intake manifold 1, that is to say without passing through the heat exchanger. heat 20.

The circuit also comprises a distribution means 24 which makes it possible to distribute the supercharged air in the bypass 12 and / or the heat exchanger 20.

In the embodiment of Figure 1A, the distribution means 24 is placed upstream of the heat exchanger 20 in the direction of circulation of the supercharged air. In this embodiment, the distribution means 24 comprises at least one inlet for the supercharged air from the compressor 18 and two outlets, each connected respectively to the bypass branch 12 and to the exchange branch 26. A Another embodiment shown in FIG. 1B proposes that the distribution means 24 be placed downstream of this heat exchanger 20 in the direction of circulation of the supercharged air. In such a case, the distribution means 24 makes it possible to distribute the supercharged air coming from the bypass and / or the exchange branch 26 into the intake manifold 1. In other words, in this example, the means of distribution 24 comprises at least two inputs each connected respectively to the bypass branch 12 and the exchange branch 26 and an output connected to the intake manifold 1. An advantage of such an embodiment is that the air the inlet which passes through the distribution means 24 is already cooled, at least when it comes from the exchange branch 26. It should be noted that such advantage is obtained with any type of distribution means and not only with the one that will be described later.

Figure 2B shows a perspective view of a valve 30 according to the invention. This valve 30 may be used instead of the distribution means 24 of the air supply circuits of a motor vehicle engine as described above.

The valve 30 comprises a body 32 and a rotatable member 34 which will be described later.

The body 32 has a bottom face 44, for example completely open, and a side wall 42 which define a housing, here cylindrical, for the rotary member 34. The side wall shape 42 is, in the example shown adapted to the shape of the rotary member 34.

The body 32 also has at least three openings. In the example shown here, the valve body 32 is provided with

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three openings which are respectively called first 36, second 38 and third 40 openings.

The second 38 and third 40 openings are, in this example, provided on the side wall 42 of the body 32. The first opening 36 is provided on the bottom face 44 of the body 32.

According to a particular embodiment, when the valve is used in a circuit as illustrated in FIG. 1A, the first opening 36 is able to be connected to a compressor of the air supply circuit on which the valve 30 is mounted . In other words, the first opening 36 corresponds to the air inlet channel in the valve 30.

The second opening 38 is, in turn, able to be connected to a so-called bypass branch. In other words, the second opening 38 corresponds to a first air outlet of the valve 30. The third opening 40 is, for its part, adapted to be connected to a so-called exchange branch. In other words, the third opening 40 corresponds to another or second air outlet channel of the valve 30. The valve 30 is here a so-called three-way valve comprising an inlet or first opening 36 and two outlets or second and third openings 38 and 40.

According to another particular embodiment and when the valve is used in a circuit as illustrated in FIG. 1B, the third opening 40 is able to be connected to a so-called exchange branch of a supply circuit. air on which the valve 30 is mounted. In other words, the third opening 40 corresponds to the first air inlet channel in the valve 30.20

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The second opening 38 is, in turn, able to be connected to a so-called bypass branch. In other words, the second opening 38 corresponds to the second air inlet channel of the valve 30.

The first opening 36 is, for its part, able to be connected to an intake manifold. In other words, the first opening 36 corresponds to an air outlet path of the valve 30.

The valve 30 is, here, a so-called three-way valve comprising two inlets or second and third openings 38 and 40, and an outlet or first opening 36.

The valve 30 will now be described, more particularly, according to the embodiment in which the valve is used in a circuit as illustrated in FIG. 1A. The same valve could be used in a circuit as illustrated in Figure 1B by adapting the inputs / outputs.

The second 38 and third 40 openings here are elongated and more particularly of oblong shape. In this embodiment, the second 38 and third 40 openings have an elongate shape along an axis of rotation of the rotary member 34.

In other words, the second 38 and third 40 openings are longer than wide and have two sides that are parallel to the axis of rotation of the rotary member. The two parallel sides are connected together at their upper and lower ends by two half cylinders. The term "upper and lower ends" means the ends of the two openings which are respectively 25

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closest to a valve cover and the first opening 36.

Each of the openings 36, 38 and 40 has a clean passage section. One embodiment of the invention proposes that one of the passage sections is smaller than the other two.

In the illustrated embodiment, the second opening 38 has a passage section smaller than the passage section of the third opening 40.

The second 38 and third 40 openings are disposed on the side wall 42 here adjoining each other.

In other words, the second 38 and third 40 openings are located contiguously on the side wall 42.

In other words, the second 38 and third 40 openings are placed relative to one another so as to leave very little material of the valve body between them.

The fact that the second and third openings 38 and 40 are very close to one another allows a rapid adjustment of the position of the rotary member 34 and thus redirects the flow of air entering the valve 30 towards the valve. one and / or the other of the two outputs sensitively and quickly 30 according to the needs of the motor vehicle. It will thus be possible to obtain fine dosages of the air passing through the outlets 38 and 40.

In other words, there will be a minimum angular displacement of the rotational member 34 between a position called total closure of the third opening 40 and total opening of

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the second opening 38 and a position called total closure of the second opening 38 and total opening of the third opening 40. This short angular displacement allows a fast response time of the valve 30.

The zone thus arranged between the two outlets 38 and 40 makes it possible in particular to ensure, thanks to the interaction with the rotary member, an absence of leakage between the opening or openings closed by the rotary member 34 and the rest of the body of the valve 32.

Here, the two openings 38 and 40 are placed substantially perpendicular to each other.

The body may comprise at least one tubulure extending one of the openings.

In the embodiment of FIGS. 2A and 2B, the body 32 comprises a pipe extending each of the openings 36, 38 and 40.

The rotary member 34 is movable inside the body 32 so as to control the passage of air through the second and third openings 38 and 40 with a law defined as a function of the angular position of the rotary member. 34 in the body 32.

In other words, the rotary member 34 is able to occupy alternately and / or successively at least one of the following positions: - total closure of said second 38 and third 40 openings, - total closure of said third opening 40 and closure / partial opening of said second opening 38 so as to regulate the

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flow of the air passing through said second opening 38, total closure of said third opening 40 and total opening of said second opening 38, partial opening / closing of said second 38 and third openings so as to distribute the flow of the air passing through said second 38 and third 40 openings, total closure of the second opening 38 and total opening of the third opening 40 total closure of the second opening 38 and partial opening / closing of the third opening 40 so as to regulate the flow rate of the air through the third opening 40.

In the embodiment illustrated in FIGS. 2A, 2B and 3, the rotatable member 34 is rotatably mounted about an axis perpendicular to the bottom face 44. The rotary member 20 is driven by motorization means, for example an electric motor.

There can also be provided safety means for the valve to be put into a position in which the second 38 and third 40 openings are both partially closed or partially open. These means may in particular be made in the form of return spring.

In the case where the valve has openings on the side wall of the body with different passage sections of size, the rotary member is able to extend so as to at least close or cover the passage section of the opening the biggest. 10 15 35

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FIG. 3 represents a sectional view of the valve 30 along the axis 3-3 shown in FIG. 2. The valve 30 comprises a cover 50 closing the housing for the rotary member 34. The cover 50 has an orifice 52 for the passage of a drive rod 54 of the rotary member 34. The lid is fixed on the valve body 32 by screws not shown.

The rotary member 34 comprises two grooves 80-1 and 80-2 called circular. In the embodiment shown here, the circular grooves 80-1 and 80-2 are both located on the so-called lateral wall of the rotary member 34.

The circular groove 80-1 is arranged on the so-called upper part of the rotary member 34, in other words on the part of the rotary member 34 close to the cover 50.

The circular groove 80-2 is, for its part, said lower part of the rotary member 34 on the part of the rotary member 34 near the bottom 44.

These circular grooves 80-1 and 80-2 are intended to accommodate seals or sealing segments (not shown in this figure).

The rotary member has a convex shape in its upper part which makes it possible to deflect the flow of air entering the valve to redirect it towards the selected outlet (s).

Figure 4 shows a perspective view of a rotary member of a valve according to the invention. Here, the rotary member 34 comprises a plug 70 and a sealing segment 72. arranged on the so-called face of

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The sealing segment 72 is here mounted on the plug 70. More specifically, the sealing segment 72 is introduced into grooves of the plug 70.

As shown in Figures 4 and 5, the plug 70 is made in the form of a cylinder of revolution.

In other words, the plug 70 has a so-called upper wall 74, a so-called lower wall 76 and a so-called perimeter wall 78. The upper wall 74 is connected to the perimeter wall 78.

The lower wall 76 comprises, in the embodiment shown, a recess or an opening 75. Here, the recess is made in the form of a circle whose diameter is substantially equal to the diameter of the circle of the generatrix curve of the cylinder. of revolution. In other words, in this embodiment, the bottom wall 76 is reduced to the perimeter of the cylinder.

Upper and lower walls 76 extend in planes which are generally parallel to bottom face 44 of valve body 32.

The upper wall 74 is provided with the driving rod 54 of the rotary member 34.

The perimeter wall 78 extends about 270 °. In other words, the perimeter wall 78 has a recess said recess of the plug which extends substantially 90 ° or in other words, the perimeter wall 78 is in the form of an arc.

The recess of the plug is adapted to come opposite the openings present on the lateral wall 42 of the body of

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valve 32, here it is the second 38 and third 40 openings.

The recess of the plug 70 is here oblong.

In other words, the recess of the plug has two sides, called large sides, parallel to the axis of rotation of the rotary member which are connected at their upper and lower ends by two half-cylinders. The term "upper and lower ends" means the ends which are respectively closest to the upper wall 74 and the lower wall 76.

The passage section of the recess of the plug corresponds to the largest passage section of one of the openings 15 located on the side wall 42.

Other forms for the recess of the bushel may be provided.

Here, the passage section of the recess of the plug corresponds to the passage section of the third opening 40.

In this embodiment, the perimeter wall 78 substantially matches the shape of the contour of the body 32 and more precisely that of the side wall 42.

The perimeter wall 78 has at least one of its ends a circular groove on the whole of its perimeter.

In this embodiment, the perimeter wall 78 has two grooves 80-1 and 80-2 respectively 80-1 and 80-2 respectively. These two grooves are here present on their entire perimeter. 14

The grooves 80-1 and 80-2 are circular and are intended to accommodate at least a portion of the sealing segment 72.

The perimeter wall 78 has a first side called shutter 60 and a second directional side 62.

The first sealing side 60 is the side of the rotary member 34 and more precisely the side of the plug 70 located closest to the side wall 42, once the rotatable member 34 mounted in the body 32.

The first sealing side 60 has the circular grooves 80-1 and 80-2.

In this embodiment, the first sealing side 60 also has so-called longitudinal grooves 82 capable of accommodating arms of the sealing segment 72. These grooves extend in the same direction as that of the perpendicular axis of rotation of the rotatable member 34 which is perpendicular to the bottom face 44.

In the embodiment shown, the plug 70 has two grooves 82 (only one of which is fully visible in FIGS. 4 and 5). The longitudinal grooves 82 are located near the recess of the plug 70 and are disposed on either side of the latter. The longitudinal grooves 82 are, here, parallel to the two long sides of the recess. The perimeter wall 78 also has a second directional side 62 corresponding to the innermost side of the valve body 32. This is the side of the rotary member 34 which is in contact with the air flowing through the valve 30.

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In this example, the shutter side 60 and the directional side 62 both have an arcuate profile.

The directional side 62 further comprises airflow deflection means made here in the form of roundings located at the upper end of the perimeter wall 78 in contact with the upper wall 74 of the plug 70.

It is the deflection means which gives the convex shape to the rotary member 34 as visible in FIG.

These means of deflecting the air flow have the function of improving the direction of the air flow entering the valve 30 to the outlet (s) and this with a minimum of pressure drop.

The deflection means may be present all along the perimeter wall 78, in other words over the entire arc forming the perimeter wall 78.

FIG. 6 is a perspective view of a sealing segment 72 of the rotary member 34 of FIG. 4. The function of the sealing segment 72 is to prevent any passage of air between the aperture (s). closed by the rotary member 34 and the rest of the valve body 32.

In this embodiment, the sealing segment 72 has at least two open rings 88 and 90 respectively called upper and lower.

The two open rings 88 and 90 are interconnected by connecting arms 92, here two in number. 35

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The two open rings are intended to be introduced, for example by clipping, respectively in the circular grooves 80-1 and 80-2 of the perimeter wall 78 of the plug 70. The open ends two rings 88 and 90 are located at the recess of the bushel 70.

The connecting arms 92 are themselves intended to be introduced, for example by clipping, at least partly in the longitudinal grooves 82 of the plug 70.

Here, the plug 70 is not in direct contact with the body of the valve 32. Indeed, when it is the sealing segment 72 which is in contact with the valve body 32 and not the plug 70, this has the advantage of allowing to limit the maneuvering forces of the rotary member.

Figures 7 to 12 show a sectional view of a valve 20 according to the invention at different stages of its use. They illustrate a method of controlling a motor using a valve according to the present invention.

In this embodiment, the valve 30 is installed in an air supply circuit and the first opening or inlet 36 is connected to a compressor, the second opening or first outlet 38 is connected to a so-called bypass branch of a heat exchanger and the third opening or second outlet 40 is connected by a so-called exchange arm 30 where there is a heat exchanger.

In the embodiment of the valve shown in FIGS. 7 to 12, two sealing segments 100 are arranged in grooves at the ends of the rotary member 34.

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FIG. 7 represents a mode of operation in which the first 38 and second 40 outputs are completely closed. In other words, the closure wall 60 of the rotary member is placed vis-à-vis the first 38 and second 40 outputs so as to completely close. No air flow can then exit the valve 30. The rotational member 34 is put in this position during, for example, stopping the engine.

FIG. 8 represents a mode of operation in which the third opening or second outlet 40 is completely closed and in which the second opening or first outlet 38 is partially opened.

In other words, the closure wall 60 of the rotary member 34 is placed vis-à-vis the opening 40 so as to completely close. The recess present on the perimeter wall is, meanwhile, placed partially vis-à-vis the second opening 38 so that the latter is partially disengaged. The air can then only go towards the bypass branch of the supply circuit.

In this position, the air enters the valve 30 through the first opening or inlet 36 and is directed by the rotary member 34 to the second opening or outlet 38. Thus, all of the air entering the valve is sent to the bypass branch and does not go into the trading branch. In this mode of operation, the air will not be cooled by the heat exchanger located on the exchange branch.

The partial closure of the second opening or first outlet 38 regulates the flow rate of the air passing therethrough.

In other words, the partial closure of the first outlet 38 makes it possible to determine the flow rate of the air exiting through the latter.

The rotary member 34 is placed in this position, for example, during the regeneration phase of a particle filter of the motor vehicle.

FIG. 9 represents a mode of operation in which the third opening or second outlet 40 is completely closed and in which the second opening or first outlet 38 is completely opened. In other words, the closure wall 60 of the rotary member 34 is placed vis-à-vis the opening 40 so as to completely close. The recess present on the perimeter wall is, in turn, placed opposite the second opening 38 so that the latter is completely disengaged. The air can then only go towards the bypass branch of the supply circuit.

In this position, the air enters the valve 30 through the first opening or inlet 36 and is directed by the rotary member 34 to the second opening or outlet 38. Thus, all of the air entering the valve is sent to the bypass branch and does not go into the 25 exchange branch. In this mode of operation, the air will not be cooled by the heat exchanger located on the exchange branch.

The rotational member 34 is set in this position, for example, during the cold start phase of the engine.

Fig. 10 shows an operating mode in which the second and third openings or first and second outlets 38 and 40 are partially closed so as to distribute the flow of air passing therethrough.

In other words, the closure wall 60 of the rotary member is placed opposite the openings or outlets 38 and 40 so as to partially seal them. In other words, the rotary member 34 partially covers the two outlets 38 and 40. In this case, the recess present on the peripheral wall is partially placed opposite the outlets 38 and 40 so that these are partially cleared.

The partial closure of the two outputs 38 and 40 of the valve makes it possible to distribute the flow of the air leaving the valve in each outlet. In other words, the partial closing of the two outlets 38 and 40 makes it possible to proportion the flow rate of the outgoing air in each outlet. Thus, the air entering the valve through the inlet 36 is distributed between the two outlets 38 and 40 as required.

In other words, the air leaving the valve 30 is sent both into the bypass branch and into the exchange branch of the supply circuit. The rotary member 34 is put in this position during, for example, during the so-called thermal regulation phase or said mode of urban and / or extra-urban operation of the engine and / or when the vehicle is traveling in winter conditions.

FIG. 11 represents a mode of operation in which the second opening or first outlet 38 is completely closed. In other words, the closure wall 60 of the rotary member is placed opposite the opening 38 so as to to completely close it. The recess present on the perimeter wall is, meanwhile, placed vis-à-vis the third opening or second outlet 40 so that the latter is fully disengaged.

The air can not then move towards the bypass branch of the supply circuit. In this position, the air enters the valve 30 through the first opening or inlet 36 and is directed by the rotary member 34 to the third opening or outlet 40.

Thus, all of the air entering the valve is sent to the exchange branch of the circuit and does not pass into the bypass branch. In this mode of operation, all of the air will be cooled by the heat exchanger located on the exchange branch.

The rotary member 34 is put in this position, for example, when the engine is running at full load and / or when the vehicle is traveling in summer conditions.

FIG. 12 represents a mode of operation in which the second opening or first outlet 38 and partially the third opening or second outlet 40 are closed completely.

In other words, the closure wall 60 of the rotary member is placed opposite the second opening or first outlet 38 so as to completely and partially close it vis-à-vis the third opening or second 40. Still in other words, the rotary member 34 completely covers the first outlet 38 in its entirety and in part the second outlet 40.

The partial closure of the second outlet 40 makes it possible to regulate the flow rate of the air passing through it. In other words, the partial closure of the second outlet 40 makes it possible to determine the flow rate of the air leaving the valve 30 through this outlet.

All of the air entering the valve is sent to the exchange branch and does not pass into the bypass branch. The rotary member 34 is placed in this position, for example, when it is desired to regulate the flow rate of the air passing through the heat exchanger and / or the regeneration phase of a particle filter of the motor vehicle . The invention is not limited to the embodiments described above, only as examples, but encompasses all the variants that may be considered by those skilled in the art within the scope of the claims below. The variants described above can be taken separately or in combination with each other.

Claims (23)

claims 1. Valve for an air supply circuit of a motor vehicle engine comprising at least one body (32) and a rotatable member (34), characterized in that said body (32) comprises at least one bottom face (44), a side wall (42) and at least three openings (36, 38, 40), respectively called first (36), second (38) and third (40) openings, said first opening (36) being located on said bottom face (44) and said second (38) and third (40) openings being located on said side wall (42) and in that said rotatable member (34) is movable within said body (32) of said in order to control the passage of air through said second (38) and third (40) openings with a defined law depending on the angular position of said rotatable member (34) in the body (32). The valve of claim 1, wherein said second (38) and third (40) openings are contiguously located on said side wall (42). 3. Valve according to claim 1 or 2, wherein said rotary member (34) comprises an axis of rotation and wherein said second (38) and third (40) openings comprise an elongate shape along said axis of rotation. 4. Valve according to one of the preceding claims, wherein said rotary member (34) is adapted to occupy alternately and / or successively at least one of the following positions: total closure of said second (38) and third (40) openings, 22 23 - total closing of said third opening (40) and closing / partial opening of said second opening (38) so as to regulate the flow of air passing through said second opening (38), - total closure of said third opening (40) ) and total opening of said second opening (38), - partial opening / closing of said second (38) and third (40) openings so as to distribute the flow of air passing through said second (38) and third (40) openings , - total closing of the second opening (38) and total opening of the third opening (40) - total closure of the second opening (38) and partial opening / closing of the third opening (4) 0) so as to regulate the flow of air passing through the third opening (40). 5. Valve according to one of the preceding claims, wherein said rotary member (34) has a recess adapted to come opposite said second (38) and third (40) openings. 6. Valve according to one of the preceding claims, wherein each of said second and third openings (38, 40) each has a passage section and wherein one of said passage section is smaller than the other. 7. Valve according to the preceding claim, wherein said recess of said rotary member (34) comprises a passage section and wherein said passage section of said recess corresponds to the largest passage section of one of said openings (38; 40) on the side wall (42). 8. Valve according to one of the preceding claims, wherein said rotary member (34) comprises a plug (70), said plug (70) having at least one perimeter wall (78), the perimeter wall (78) comprising at least one of its ends a circular groove (80-1, 80-2) over its entire perimeter, said circular groove (80-1, 80-2) being intended to accommodate at least a portion of a sealing segment (72). 9. Valve according to the preceding claim, wherein said perimeter wall (78) extends over approximately 270 ° and comprises a first side called shutter (60) and a second said directional side (62). 10. Valve according to the preceding claim, wherein said first sealing side (60) having said longitudinal grooves (82) adapted to receive connecting arms (92) of a sealing segment (72), said grooves longitudinal members being disposed on either side of said recess of the rotary member (34). 11. Valve according to one of claims 9 or 10, wherein said directional side (62) further comprises deflection means of the air flow (86) located at the said upper end of said perimeter wall (78). ), said upper end being in contact with an upper wall (74), said upper wall (74) extending in a plane generally parallel to said bottom face (44) of the valve body (32). 12. Valve according to one of claims 8 to 11, wherein said rotary member (34) further comprises a sealing segment (72). 13. Valve according to the preceding claim, wherein the sealing segment (72) comprises two open rings (88, 90) connected by connecting arms (92), said two open rings being intended to be introduced into the circular grooves. (80) of the plug (70) and said connecting arms (92) being intended to be introduced at least in part into the longitudinal grooves (82) of the plug 70. 14. Valve according to one of claims 1 to 13, wherein said valve comprises a cover (50), said cover having an orifice (52) for the passage of a drive rod (54) of the rotary member (34). 15. Valve according to one of the preceding claims, wherein said body (32) comprises at least one tubulure extending one of said openings (36, 38, 40). 16. An air supply circuit of a motor vehicle engine comprising a valve according to one of the preceding claims. 17. Power supply circuit according to the preceding claim, wherein a first opening (36) is adapted to be connected to a compressor (18), a second opening (38) is adapted to be connected to said motor by a branch called bypass (12) and a third 26 opening (40) is adapted to be connected to said motor by a so-called exchange branch. 18. A supply circuit according to claim 16, wherein a first opening (36) is adapted to be connected to an intake manifold (1) of an engine, a second opening (38) is adapted to be connected to said motor by a so-called bypass branch (12) and a third opening (40) is adapted to be connected to said motor by a so-called exchange branch. 19. A method of controlling a motor using a circuit according to claim 17 or 18, characterized in that it completely closes said second (38) and third (40) openings when stopping said motor. 20. A control method according to one of claims 17 or 18, characterized in that completely closing said third opening (40) during the cold start phase of said engine. 21. Control method according to one of claims 17 or 18, characterized in that completely closing said third opening (40) and partially said second opening (38) so as to regulate the flow of air passing through said second opening (38) during the regeneration phase of a particle filter of said motor vehicle opening. 22. Control method according to one of claims 17 or 18, characterized in that partially closes said second (38) and third openings (40) so as to distribute the flow of air passing through said second (38) and third (40) openings during the so-called thermal regulation phase. 23. A control method according to one of claims 17 or 18, characterized in that completely closes the second opening (38) when said motor runs at full load.