FR2890699A1 - HEAT EXCHANGE MODULE FOR CONTROLLING THE GAS TEMPERATURE ADMITTED IN A VEHICLE ENGINE OF A VEHICLE WITH V-CYLINDER BENCHES - Google Patents

Abstract

The heat exchange module of the invention comprises an inlet chamber (10) for charge air and an inlet chamber (12) for recirculated exhaust gas. The inlet chambers (10, 12) are in the form of two adjacent substantially parallel ducts adapted to be housed between the banks (4) of cylinders (6). On each side of each inlet chamber (10, 12), the module (8) comprises a charge air cooler (14) and a recirculated exhaust gas cooler (16), and a common outlet chamber (18) to which the coolers (14, 16) are connected. The outlet chambers (18) are formed in the form of ducts substantially parallel to the ducts of the inlet chambers (10, 12) and are designed to supply the cylinders of a respective engine bed. A thermal engine with V-shaped cylinder banks comprising such a heat exchange module. Application to motor vehicles.

Description

2890699 1

  The invention relates to heat exchangers for cooling or heating the gases admitted to the combustion chambers of a vehicle engine with V-cylinder banks. a motor vehicle engine.

  It relates more particularly to a heat exchange module for temperature regulation of a mixture of intake air and recirculated exhaust gas admitted into a thermal engine with two banks of V cylinders, comprising a combustion chamber. inlet for charge air and an inlet chamber for recirculated gases.

  Turbo-compressed engines, in particular diesel or gasoline engines, are powered by pressurized air called charge air from a turbo-compressor powered by the engine exhaust gas.

  It is necessary to cool this air before admission to the engine. For this purpose, it is conventionally used for a cooler called a charge air cooler or, more generally, a supply air cooler.

  Furthermore, it is known to recirculate a portion of the exhaust gas to the intake of the engine so that they are more completely burned. However, since these gases are at a very high maximum temperature (400 ° C. to 900 ° C.), it is known to cool them by circulating them in another exchanger supplied with a cooling liquid. There are various architectures for such heat exchange modules, but they generally occupy a lot of space, which hinders the design of the vehicle.

  This problem arises in particular for thermal engines with V-cylinder banks because of their large size, especially in a direction transverse to the axis of the banks of cylinders, ie the axis of rotation of the engine.

  The invention aims to improve the situation.

  For this purpose, it proposes a heat exchange module for the temperature regulation of a mixture of intake air and recirculated exhaust gas admitted into a thermal engine with two banks of V cylinders, comprising a inlet chamber for charge air and an inlet chamber for recirculated gases. According to the invention, the inlet chambers are made in the form of two adjacent substantially parallel ducts adapted to be housed between the banks of cylinders, and on either side of the inlet chamber for air of the supercharger and of the inlet chamber for recirculated gases, the module comprises respectively a charge air cooler and a recirculated gas cooler, as well as a common outlet chamber to which said coolers are connected, said cooling chamber being output being made in the form of a duct substantially parallel to the ducts of the inlet chambers, the outlet chambers being each provided for supplying the cylinders of a respective bank of the engine with a mixture of supercharged air and recirculated gas.

  Such a heat exchange module, placed between the banks of cylinders, saves an extremely important place that can then be dedicated to security elements, aesthetic design, or to integrate other functional components in the engine compartment.

  Advantageously, the cooling path of the charge air and recirculated gases is substantially transverse to a longitudinal direction of said conduits.

  In one embodiment, the inlet chamber for the charge air and the inlet chamber for the recirculated gases are made with a single conduit having a partition separating the two chambers.

  In another embodiment, the charge air cooler and the recirculated gas cooler are embodied as a heat exchange bundle separated into two zones by a partition.

  These embodiments make it possible to produce a compact and inexpensive heat exchange module.

  In an alternative embodiment, the charge air cooler and the recirculated gas cooler are constructed as two separate heat exchange bundles.

  The heat exchange module may comprise means for adjusting the charge air flow rate, as well as supercharging air distribution means, and two bypass bypass connecting the supercharging air distribution means to the chambers. Release.

  The supercharging air distribution means may comprise two distribution valves, each connected by one of said bypass bypass to an outlet chamber.

  The module may comprise recirculated gas flow control means, as well as recirculated gas distribution means, and two bypass bypass connecting the recirculated gas distribution means to the outlet chambers.

  The recirculated gas distribution means may comprise two distribution valves, each connected by one of said bypass bypass to an outlet chamber. In one embodiment, the recirculated gas flow control means and the recirculated gas distribution means are made in the form of a single valve.

  These embodiments make it possible to precisely control the supercharging air flow rate and its outlet temperature of the heat exchange module.

  The module may also include a heating resistor disposed in each output chamber, which allows better control of the engine start cycle.

  The invention also relates to a thermal engine with two banks of V cylinders, which comprises a heat exchange module as described above housed between the banks of cylinders, the outlet chambers each supplying the cylinders of a cylinder. respective bench by a mixture of supercharged air and recirculated gas.

  Other advantages and characteristics of the invention will emerge more clearly on reading the description of examples given by way of non-limiting illustration, taken from the drawings in which: FIG. 1 shows a partly broken-away perspective view of an engine thermal cylinder with V-shaped cylinders comprising a heat exchange module according to the invention; FIG. 2 shows a substantially front and partially cutaway perspective view of a variant of FIG. 1; and Figure 3 shows a schematic view of another variant of the invention.

  FIG. 1 is a partially broken away perspective view of a heat engine 2 with two banks 4 of V-shaped cylinders 6. By "V", it is meant that the banks 4 extend in a longitudinal direction of the engine and form an angle with each other, giving a general V shape for the engine. It may be, for example, a type V6 or V8 engine.

  A heat exchange module 8 according to the invention is housed between the branches of the V, that is to say between the benches 4. This heat exchange module 8 comprises an inlet chamber for the supercharging air 10, an inlet chamber for recirculated gases 12, two pairs of coolers 14 and 16 on either side of the inlet chambers 10 and 12, and two outlet chambers 18 between each pair of chillers and the walls of each bench 4.

  The inlet chamber 10 for the supercharging air is here produced in the form of a duct which extends along the longitudinal direction of the engine 2, substantially centered on the middle of the branches of the V, this is say substantially parallel to the axis of rotation (not shown) of the engine 2.

  This duct is defined longitudinally by an upper wall 20 and a lower wall 22, and laterally on each side by the respective faces of the coolers 14.

  The wall 20 is a trapezoidal section section with its large base removed. The wall 22 is a flat plate parallel to the portion of the wall 20 corresponding to the small base of its section.

  In the embodiment described, the inlet chamber for recirculated gases 12 is in the form of a duct parallel to and adjacent to that which forms the inlet chamber for charge air 10.

  This duct is defined longitudinally by the wall 22 and a wall 24 which is parallel to the wall 22, and laterally on each side by the respective faces of the coolers 16. In the example described here, a wall 26 separates the inlet chamber 12 for recirculated gases in two chambers respectively 12a and 12b. The inlet chamber 10 of the charge air can also be separated into two chambers 10a, 10b by said partition 26.

  In the example described, the wall 22 thus plays a role of partition. In fact, in a duct defined by the wall 20, the wall 24 and the side walls of the coolers 14 and 16, this partition makes it possible to define two adjacent and parallel ducts extending in the longitudinal direction to form the inlet chambers 10 and 12.

  The coolers 14 and 16 are in the example described here made in the form of a single heat exchange beam 28, separated in two by a partition 30 at the level of the partition 22.

  The beam 28 may be made conventionally by stacking plates or fins or other ways known to those skilled in the art. The partition 30 makes it possible to define two separate paths for the cooling fluids passing through the cooler 14 on the one hand and the cooler 16 on the other hand, in order to separately cool the charge air coming from the inlet chamber for cooling. the supercharging air 10 on the one hand, and the recirculated gases from the inlet chamber for recirculated gases 12 on the other hand.

  The outlet chamber 18 is in the form of a duct which extends along the banks 4 in the longitudinal direction. This duct is delimited longitudinally by an extension 32 of the wall 20 and an extension 34 of the wall 24 and laterally by the faces of the coolers 14 and 16 on the one hand and the inlet manifold walls 36 for the cylinders 6 of somewhere else. The tubes 36 allow the admission of a mixture made in each outlet chamber 18 of charge air and cooled recirculated gas.

  When the engine 2 is running, charge air is delivered through a valve 38 to the inlet chamber 10 for charge air.

  The valve 38 is adapted to regulate the charge air flow through the module 8 and to control the outlet temperature of this charge air. For this, a portion of this air is directly deflected in the outlet chambers 18 via bypass bypass which do not appear in this figure.

  A valve similar to valve 38 is present for the recirculated gases, and operates with similar bypass bypasses, but this valve and these taps do not appear in the drawings.

  FIG. 2 shows an engine comprising another embodiment of the heat module according to the invention in a still partially cut-away perspective view, but this time substantially along the longitudinal axis of the engine 2.

  In this variant, the wall 26 has been removed and the coolers 14 and 16 are here made in the form of contiguous separate beams.

  In addition, electrical heating resistors 40 have been added to each outlet chamber 18. In particular, they may be positive temperature coefficient resistors (so-called PTC resistors). The resistors 40 are used when starting the vehicle, when the charge air and / or the recirculated gases are not hot enough. They are then entirely derived directly in the outlet chamber 18 to be reheated.

  Figure 3 shows a substantially front schematic view of an alternative embodiment.

  In this variant, the valve 38 is made in the form of a valve 44 for regulating the charge air flow, connected to two valves 46 for distributing charge air.

  Each valve 46 is connected on the one hand to the inlet chamber 10 for charge air, and to an outlet chamber 18 by a bypass bypass 48.

  A similar arrangement is also adopted for the flow control and recirculating gas distribution means with a flow control valve 50, two distribution valves 52 and bypass bypass connections 54.

  The scope of the invention is not limited to the embodiments described above. It includes all the variants that the skilled person will consider and which are defined by the appended claims.

Claims (14)

claims   1. Heat exchange module for the temperature regulation of a mixture of intake air and recirculated exhaust gases admitted in a thermal engine with two banks of V cylinders, comprising an inlet chamber ( 10) for charge air and an inlet chamber (12) for recirculated gases, exchange module in which the inlet chambers (10, 12) are in the form of two adjacent substantially parallel ducts adapted to be accommodated between the banks (4) of cylinders (6), and on either side of the inlet chamber (10) for charge air and the inlet chamber (12) for recirculated gases, the module (8) comprises respectively a charge air cooler (14) and a recirculated gas cooler (16), as well as a common outlet chamber (18) to which said coolers are connected ( 14, 16), said outlet chamber (18) being in the form of a substantially is connected to the ducts of the inlet chambers (10, 12), the outlet chambers (18) being each provided for supplying the cylinders of a respective bank of the engine with a mixture of supercharged air and recirculated gases.   2. heat exchange module according to claim 1, characterized in that the cooling path of the charge air and recirculated gas is substantially transverse to a longitudinal direction of said ducts.   Heat exchange module according to one of Claims 1 and 2, characterized in that the inlet chamber (10) for the charge air and the inlet chamber (12) for the recirculated gases are performed with a single conduit having a partition (22) separating the two chambers (10,12).   4. Heat exchange module according to one of claims 1 to 3, characterized in that the charge air cooler (14) and the recirculated gas cooler (16) are designed as a bundle heat exchanger (28) separated into two zones by a partition (30).   5. Heat exchange module according to one of claims 1 to 3, characterized in that the charge air cooler (14) and the recirculated gas cooler (16) are made in the form of two beams of heat. 'separate heat exchange.   6. Heat exchange module according to one of claims 1 to 5, characterized in that it comprises means for adjusting the charge air flow (44).   7. heat exchange module according to one of claims 1 to 6, characterized in that it comprises supercharging air distribution means (46), and two derivations (48) bypass connecting the means of supercharging air distribution (46) at the outlet chambers (18).   8. heat exchange module according to claim 7, characterized in that the supercharging air distribution means comprise two distribution valves (46), each connected by one of said bypass bypass (48) to a chamber of output (18).   2890699 13 9. heat exchange module according to one of claims 1 to 8, characterized in that it comprises recirculated gas flow adjustment means (50).   10. Heat exchange module according to one of claims 1 to 9, characterized in that it comprises recirculated gas distribution means (52), and two bypass derivations (54) connecting the distribution means of recirculated gas (52) at the outlet chambers (18).   11. Heat exchange module according to claim 10, characterized in that the recirculated gas distribution means comprise two distribution valves (52), each connected by one of said bypass bypass (54) to an outlet chamber ( 18).   12. Heat exchange module according to claims 9 and 10, characterized in that the recirculated gas flow control means and the recirculated gas distribution means are formed as a single valve.   13. Heat exchange module according to one of the preceding claims, characterized in that it comprises a heating resistor (40) disposed in each outlet chamber (18).   14. Thermal engine with two banks of V cylinders, characterized in that it comprises a heat exchange module (8) according to one of claims 1 to 13 housed between the banks (4) of cylinders (6). , the outlet chambers (18) each supplying the cylinders (6) of a respective bench (4) with a mixture of supercharged air and recirculated gas. 10 15 20 25