FR3049312A1 - DEVICE AND COOLING SYSTEM FOR GAS SUPPLYING A COMBUSTION ENGINE - Google Patents

Abstract

The invention relates to a compact cooling device (DIS) for supply gas of a combustion engine of a vehicle, using a coolant, characterized in that it comprises: a compartment (CP1) housing a zone heat exchange between said coolant and a cooling chamber of a pipe supplying supercharging air to said combustion engine, - a compartment (CP2) housing a heat exchange zone between said heat transfer fluid and a cooling chamber. cooling of an exhaust gas recirculation pipe.

Description

Device and cooling circuit for feed gas of a combustion engine

The present invention relates generally to the field of the automobile, and more specifically relates to a cooling device for feed gas of a combustion engine.

In certain vehicles with a combustion engine, in particular with a diesel engine, it is necessary to use heat exchangers to cool the charge air at the outlet of the turbocharger before it enters the engine, as well as to cool the exhaust gases. recycled. These heat exchangers are located on a front or rear side or on one side of the cylinder head of the engine in the engine compartment, and generate a large footprint thereof. Indeed, each exchanger must be dimensioned so as to effectively cool the charge air or the exhaust gas, and requires, depending on the technology chosen for cooling, a supply of air or water, provided by pipes. passing from the rear part to the front part of the engine compartment.

There is therefore a need for compactness of the cooling systems in the engine compartment.

One of the aims of the invention is to overcome at least some of the disadvantages of the prior art by providing a compact cooling device and a cooling circuit for feed gas of a combustion engine, which make it possible to reduce the number and size of pipes in the engine compartment. To this end, the invention proposes a compact cooling device for a supply gas of a combustion engine of a vehicle, using a heat transfer fluid, characterized in that it comprises: a compartment housing an exchange zone thermal between said coolant and a cooling chamber of a pipe supplying supercharging air to said engine, a compartment housing a heat exchange zone between said coolant and a cooling chamber of a recirculation pipe exhaust gas.

Thanks to the invention, the supercharging and exhaust gases are cooled by a single device, using the same cooling technology, which allows a more compact cooling system requiring fewer pipes in the engine compartment.

According to an advantageous characteristic of said device, said compartments are integral with a housing having an inlet and at least one outlet of said heat transfer fluid adapted to be connected to a circulation circuit of said heat transfer fluid, said housing further comprising a downstream temperature probe said heat exchange zones.

Thus, depending on the outlet temperature of said device, said coolant is for example used to promote the rise in temperature of the engine, or to reduce the power consumption of unit heaters activated for the thermal comfort of the passenger compartment.

According to another advantageous characteristic of said device, it further comprises a compartment housing a heat exchange zone between said heat transfer fluid and an oil circulation circuit of said combustion engine.

Thus, the compact cooling device according to the invention also makes it possible to cool the oil of said combustion engine. The invention also relates to a cooling circuit comprising: a compact cooling device according to the invention. a circulation circuit of said heat transfer fluid adapted to circulate said heat transfer fluid from said at least one outlet of said housing to a radiator of said vehicle, then said radiator to the cylinder head of said combustion engine, said cylinder head being connected to said input of said housing of said device .

Advantageously, said circulation circuit is also able to circulate said coolant at the outlet of said cooling device to at least one heater.

Finally, advantageously, said cooling circuit further comprises a bypass circuit bypassing said radiator, as well as a valve adapted to direct said heat transfer fluid into the bypass circuit and then into said circulation circuit without passing through said radiator, when the temperature at the outlet of said housing is below a predetermined temperature threshold.

The cooling circuit according to the invention has advantages similar to those of the compact device according to the invention. Other characteristics and advantages will appear on reading a preferred embodiment described with reference to the figures in which: FIG. 1 represents a compact cooling device according to the invention; FIG. 2 represents a sectional view of the compact cooling device according to the invention; and FIG. 3 represents a cooling circuit according to the invention.

According to a preferred embodiment of the invention shown in FIG. 1, the compact cooling device DIS of a combustion engine vehicle according to the invention comprises: a compartment CP1 in which the supercharging air coming from a turbocharger is cooled before being fed into the combustion engine; the compartment CP1 therefore comprises an air inlet adapted to be connected to an air inlet pipe, and an air outlet adapted to be connected to an air supply pipe for the combustion engine; a compartment CP2 in which the exhaust gases to be recycled from an EGR system ("Exhaust Gas Recirculation") are cooled before being fed into the combustion engine; the compartment CP2 therefore comprises an inlet nozzle allowing the arrival of exhaust gas to be recycled and an outlet nozzle adapted to be connected to an EGR supply pipe for the combustion engine; - A BES water inlet and outlet housing comprising a temperature sensor ST connected by a data connection not shown, to a computer managing the cooling system of the vehicle components.

It should be noted that the cooling device DIS at least makes it possible to size the air-air heat exchanger dedicated to cooling the supercharging system of the vehicle with a smaller volume than in the prior art, if it is not to remove it entirely. .

The cooling device DIS is for example fixed on the front face or on the rear face, or on the cylinder head side of the combustion engine. In this preferred embodiment, the compartment CP1, the water inlet and outlet box BES and the compartment CP2 are stacked vertically one above the other in a compact manner, which allows a saving of space in the room. engine compartment. Indeed, this DIS device allows to cool by the same heat transfer fluid, which is in this embodiment of water, both the charge air and the exhaust gas to be recycled. It therefore only requires one EE water inlet and one SE water outlet at the BES water inlet and outlet box. In this embodiment of the invention, the EE water inlet is located on the cylinder head side of the combustion engine.

With reference to FIG. 2, the compact cooling device DIS according to the invention is seen in section vertically, the section being made parallel to the flow axes of the feed gases of the combustion engine. The water inlet (EE) of the BES box and the water outlet SE of the BES water inlet and outlet box are connected to a circulation circuit CCI of water internal to the device DIS. This circulation circuit CCI allows the cooled water from a cooling circuit CR shown in FIG. 3, to cool the charge air via a zone ZE1 for heat exchange, and the exhaust gases to be recycled via a zone ZE2 heat exchange, before leaving the DIS device to possibly heat the combustion engine, before being cooled again in RAD radiator located at the front of the vehicle. The temperature sensor ST measuring the temperature T at the outlet of the device DIS is situated downstream of the internal circulation circuit CCI, just before the water outlet SE of the housing BES.

The water outlet SE allows the heat transfer fluid to supply calories to one or more air heaters located on the cooling circuit CR, and possibly supply a reduced turbo cooling device for the combustion engine, or yet another cooling device (for a gearbox for example). The DIS device optionally comprises a secondary water outlet SES intended to supply a heat exchanger for the engine oil.

The internal circulation circuit CCI forms a network of tight turns against a wall of the device DIS common to the cooling chambers of the charge air and the exhaust gas respectively present in the compartments CP1 and CP2. In a variant, the internal circuit CCI forms spirals or turns first in one of the cooling chambers and then in the other.

It should be noted that in an alternative embodiment of the invention, the circulation circuit CCI is internal to the cylinder head of the combustion engine.

In this case, the heat transfer fluid cools the charge air and the exhaust gases by contact between the cylinder head and the cooling chambers of the compartments CP1 and CP2. At its entry into the BES box the water then emerges directly through the exit SE without going through a network of turns or coils.

A cooling circuit CR according to the invention is shown in FIG. 3. It incorporates a DIS device according to the invention in a water circulation circuit CC, comprising a circulation pump, not shown, which allows the water to circulate. from the SE exit of the BES box to a radiator RAD of the vehicle, then from the radiator RAD to the cylinder head of the combustion engine, the cylinder head being connected to the input EE of the BES box of the device DIS. The water leaving the DIS device is directed to one or more CTP air heaters, and possibly to other cooling devices, before returning to the radiator RAD to be cooled via the air entering the vehicle.

A three-way V valve allows the water at the outlet of the CTP fan heater (s) to return directly to the GMPT combustion engine, passing through a bypass circuit CD which bypasses the radiator RAD, to allow the water to flow. Preheat the GMPT combustion engine.

The computer managing the cooling system of the bodies of the vehicle controls the valve V so as to pass the water in the bypass circuit CD when the combustion engine is cold, that is to say, in the starting phase, and that the temperature at the outlet of said device DIS is below a predetermined temperature threshold. When the engine no longer requires preheating, the computer controls the valve V so as to prevent the circulation of water in the circulation circuit CD, and to send the water outlet of the device DIS to the unit or heaters and then to the radiator RAD.

In this preferred embodiment of the invention, the coolant used by the compact cooling device according to the invention is water, but alternatively, other heat transfer fluids are of course usable. The compact cooling device is also implemented differently in other embodiments, for example its compartments are arranged horizontally below the water box and comprise an additional heat exchange zone able to cool an oil circuit. engine.

Claims (6)

A compact cooling device (DIS) for the supply gas of a combustion engine (GMPT) of a vehicle, using a heat transfer fluid, characterized in that it comprises: a compartment (CP1) housing a zone d heat exchange (ZE1) between said coolant and a cooling chamber of a pipe supplying supercharging air to said combustion engine (GMPT), a compartment (CP2) housing a heat exchange zone (ZE2) between said coolant and a cooling chamber of an exhaust gas recirculation pipe. 2. Device according to claim 1, characterized in that said compartments (CP1, CP2) are integral with a housing (BES) having an inlet (EE) and at least one outlet (SE) of said heat transfer fluid adapted to be connected to a circulation circuit (CC) of said heat transfer fluid, said housing (BES) further comprising a temperature sensor (ST) downstream of said heat exchange zones (ZE1, ZE2). 3. Device according to any one of claims 1 or 2, characterized in that it further comprises a compartment housing a heat exchange zone between said heat transfer fluid and an oil circulation circuit of said engine (GMPT ). 4. Cooling circuit (CR) comprising: a compact cooling device (DIS) according to claim 2, a circulation circuit (CC) of said heat transfer fluid able to circulate said heat transfer fluid from said at least one outlet (SE) of said housing (BES) to a radiator (RAD) of said vehicle, then said radiator (RAD) to the cylinder head of said engine, said cylinder head being connected to said input (EE) of said housing (BES) of said device (DIS). 5. Cooling circuit (CR) according to claim 4, wherein said circulation circuit (CC) is further adapted to circulate said heat transfer fluid at the outlet of said cooling device (DIS) to at least one fan heater (CTP). 6. Cooling circuit (CR) according to claim 5, characterized in that it further comprises a bypass circuit (CD) bypassing said radiator (RAD), and a valve (V) adapted to direct said heat transfer fluid in the bypass circuit (CD) then in said circulation circuit (CC) without passing through said radiator (RAD), when the temperature (T) at the outlet of said housing (BES) is below a predetermined temperature threshold.