WO2005100759A1

WO2005100759A1 - Cooling system for an internal combustion engine and internal combustion engine

Info

Publication number: WO2005100759A1
Application number: PCT/EP2005/051598
Authority: WO
Inventors: Max Paty
Original assignee: Deere & Company
Priority date: 2004-04-17
Filing date: 2005-04-12
Publication date: 2005-10-27
Also published as: DE102004018675A1

Abstract

Conventional cooling systems for internal combustion engines comprise a number of parallel or serial cooling circuits, which require a number of lines, connections and a significant installation volume. A cooling system (10, 10', 10'') for an internal combustion engine is disclosed, comprising several modules or components for cooling by means of a coolant (24, 24a) circulating in the cooling system (10, 10', 10'') and several partial cooling circuits (26, 26a, 26b, 26c, 26d) provided for the respective modules or components with regions (30) in which an energy transfer from the module or component to the coolant (24, 24a) occurs, whereby at least two different regions (30) provided for modules or components are arranged in a common unit (32). An internal combustion engine with such a cooling system (10, 10', 10'') is also disclosed.

Description

COOLING SYSTEM OF AN INTERNAL COMBUSTION ENGINE AND INTERNAL COMBUSTION ENGINE

The invention relates to a cooling system of an internal combustion engine, with a plurality of assemblies or parts to be cooled by coolant circulating in the cooling system, which has a plurality of cooling circuits associated with the respective assemblies or the respective component with areas in which an energy transfer from the assembly or the Component to the coolant and an internal combustion engine.

DE-A-199 55 302 shows an internal combustion engine with a coolant circuit which, in the flow direction behind a coolant pump, an engine cooling circuit through the internal combustion engine with a crankcase and a cylinder head, an exhaust gas circuit with an exhaust gas collector pipe and an exhaust gas turbocharger and a heat exchanger circuit with a charge air heat exchanger and a raw water - Has heat exchanger, which are arranged in parallel and which are brought together again before the coolant pump.

The problem on which the invention is based is seen in the fact that such an internal combustion engine or a cooling system for such an internal combustion engine has many individual assemblies and is therefore complex to construct or requires a large installation space.

According to the invention, this problem is solved by the teaching of claims 1 and 10, respectively, features being listed in the further claims, which further develop the solution in an advantageous manner.

In this way, a cooling system of an internal combustion engine is made available, which is of particularly compact design, since the areas in which an energy transfer takes place from an assembly of the internal combustion engine to be cooled to a coolant circulating in the cooling system are arranged in a common unit. If at least two of the cooling circuits are arranged in parallel, they can have a common inlet or a common outlet and can be supplied with coolant by only one coolant flow. Such an embodiment is particularly space-saving and, moreover, has a lower flow resistance than an arrangement of another type, which, for example, reduces the risk of cavitation. The coolant must be pumped against a lower differential pressure so that ^{: *} overall a lower drive power is required.

If at least two of the cooling circuits are supplied with coolant independently of one another, stronger or different cooling of assemblies can be achieved in this way.

The common unit can be realized, for example, by an arrangement in a common housing. However, the areas as such preferably form a unit or are designed in the manner of a housing. The unit can be arranged adjacent to the internal combustion engine or a cylinder head or an engine block of the internal combustion engine or can form part of the internal combustion engine, the cylinder head or the engine block.

The assembly or component can be, for example, the cylinder head and / or the engine block of the internal combustion engine and / or also a turbocharger, an exhaust gas energy recovery unit, an exhaust gas outlet or exhaust manifold and / or any other component or any other Act assembly of the internal combustion engine or any other component / group assigned to the internal combustion engine.

If at least one of the areas is arranged in such a way that an energy transfer to the coolant can take place in this area from two assemblies / parts, this further contributes to a compact design. For this purpose, the assemblies / parts can be provided adjacent to one another in such a way that the region is arranged between them, so that it adjoins both the one assembly or one component and the other assembly or the other component, so that an energy transfer can take place.

The cooling system preferably includes at least one coolant pump and is connected to a ^'such to the coolant in the cooling system or cooling circuits to enable circulation to the energy-containing and heated coolant from the field, transported and lower coolant-energy potential or replace cooler coolant. After being removed, the coolant can be fed to a heat exchanger, for example in the manner of an air-cooled or otherwise cooled cooling device, in order to make it ready for use again and to feed it to the area again.

If an internal combustion engine has such a cooling system, it can be made particularly compact and thus saves installation space. In addition, due to the arrangement of the areas in a common unit, a reduced number of connections in the manner of lines, hoses or connection pieces, as well as assigned brackets, flanges etc. is necessary, which favors an inexpensive construction and reduces the number of possible leakage points and thus the Operational security is increased.

Such an internal combustion engine can be adapted to different fields of application, for example on land as well as on water. In marine applications in particular, it is important, for example due to safety aspects, that the exhaust gas outlet or manifold, turbocharger or housing of turbocharger turbines are adequately cooled, since very high temperatures are reached in these areas at full load. Marine applications also point out often the peculiarity of the use of cooling by sea water.

Such an internal combustion engine can be used both in an at least substantially stationary use, for example in a generator or power plant, etc., or in a mobile manner, for example in a vehicle or ship, etc. In particular, such an internal combustion engine is in cramped operating conditions, such as occur on ships, submarines or on construction or industrial machines or on agricultural machines, such as harvesting machines or agricultural tractors, due to the large number of additional units and the additional installation space required , beneficial.

An internal combustion engine according to the invention can be operated, for example, with liquid gas or any other suitable fuel; in particular, however, it is a diesel or gasoline engine.

The drawing shows three exemplary embodiments of the invention described in more detail below. It shows:

1 is a schematic representation of a cooling system with a cooling circuit,

• Fig. 2 is a schematic representation of a second cooling system with separate cooling circuits and

Fig. 3 shows another cooling system, adapted to cooling by raw water, for example in the manner of sea water.

Reference is first made to FIG. 1, which shows a schematic illustration of a cooling system 10 of an internal combustion engine, which is represented in the present illustration by its components. According to the first exemplary embodiment, the internal combustion engine has an engine block 12, a cylinder head 14, an exhaust manifold or an exhaust gas outlet 16, a turbocharger 18, an exhaust gas recirculation 20 and a charge air supply 22. In addition, the internal combustion engine can have additional components which, for reasons of simplicity, are not addressed in the present application, but are sufficiently known to the person skilled in the art, or one or more of the components mentioned can be omitted. For example, the internal combustion engine can also do so act as an uncharged internal combustion engine, which has no turbocharger.

The cooling system 10 serves at least to cool the engine block 12, the cylinder head 14, the exhaust gas outlet 16, the turbocharger 18, the exhaust gas recirculation 20 and the charge air supply 22 of the internal combustion engine.

For this purpose, the cooling system 10 has a coolant pump 23, which circulates a coolant 24 in a cooling circuit 26, which contains the components, ie the engine block 12, the cylinder head 14, the exhaust gas outlet 16, the turbocharger 18, the exhaust gas recirculation 20 and the charge air supply 22 with the coolant 24 supplied to cool them, and the heated coolant 24 leads to a heat exchanger 28, in which the excess heat or energy dissipated by the coolant 24 from the components is removed or given off to another medium or the environment , In addition, lines, pipes, connecting and / or connecting pieces are provided which are suitable for guiding the coolant 24 from the coolant pump 22 to the components, further to the heat exchanger 28 and back to the coolant pump 23. The heat exchanger 28 according to the present exemplary embodiment is designed in the manner of a known air-cooled heat exchanger, as is generally known and customary, for example, on vehicles. The coolant 24 is conducted by the cooling circuit 26 through or past the respective components in such a way that energy or heat is transferred from the latter to the coolant 24 in order to remove excess or dissipated heat / energy from the component by means of the coolant 24. The components have one or more region (s) 30 in which an energy transfer from the assembly or the component to the coolant 24 can take place. This area 30 or these areas 30 can be made in a known manner, for example through a wall of a cooling channel that extends through or past the component / assembly, or also from partial areas of such a hole in a housing or in are otherwise formed, which is suitable for guiding the coolant 24 through a component / assembly or through two or more components / assemblies or along one or more component / s / assembly (s).

According to the invention, at least two different areas 30 assigned to the named components or assemblies, in which an energy transfer from the assembly or the component to the coolant 24 can take place, are arranged in a common unit 32. This unit 32 can be designed, for example, in the manner of a housing which, for example, is adjacent to the internal combustion engine or is also provided separately or independently or adjacent to the internal combustion engine. The unit 32 can be formed by a unitary or multi-part cast body or cast part, in which / in which the regions 30 and / or the components, also in sections, are integrated.

According to the exemplary embodiment shown in FIG. 1, the areas assigned to the exhaust gas outlet 16, the turbocharger 18 and the charge air supply 22 are combined in a common unit 32. In addition, the exhaust gas outlet 16 and the turbocharger 18 are arranged such that at least in one of the areas 32 there is an energy / heat transfer from both the exhaust gas outlet 16 and the turbocharger 18 to the coolant 24 can be done. For this purpose, the area can be designed, for example, in the manner of a common cooling channel or a cooling line adjacent to both components.

Furthermore, it can be seen from the first exemplary embodiment that the exhaust gas outlet 12, the turbocharger 18 and the exhaust gas recirculation or the regions 30 thereof in the cooling circuit, in contrast to the other components or their regions 30, which are arranged in series in the cooling circuit 26 are arranged in parallel. For this purpose, the cooling circuit 26 divides in front of the exhaust gas outlet 16 / the turbocharger 18 into two parallel lines 34, which unite again after the coolant 24 has flowed through the exhaust gas outlet 16 / the turbocharger 18 and the exhaust gas recirculation 20.

Reference is now made to FIG. 2, in which a second exemplary embodiment of a cooling system according to the invention is shown. This second cooling system 10 ^? differs from the cooling system 10 shown in FIG. 1 in that it comprises a first cooling circuit 26a and a second cooling circuit 26b. The remaining components or assemblies correspond to the components / assemblies of the first exemplary embodiment shown in FIG. 1, which is why the reference numbers of the first exemplary embodiment are used accordingly.

Such a design of the cooling system 10 'with independent cooling circuits 26a and 26b can be provided in particular if an increased cooling capacity is required for one or more of the components / assemblies.

According to the present exemplary embodiment, the charge air supply 22 is cooled by means of the second coolant circuit 26b. However, any other component / assembly or two or more components / assemblies could also be cooled by the second coolant circuit 26b. The two cooling circuits 26a and 26b could be arranged in parallel such that the coolant through a common coolant pump 23 is circulated in the cooling circuits 26a and 26b. However, the embodiment shown in FIG. 2 has two coolant pumps 23a and 23b, the coolant pump 23a being arranged in the first cooling circuit 26a and the coolant pump 23b in the second coolant circuit 26b. A corresponding arrangement is also possible with reference to the heat exchanger 28, wherein according to the present embodiment a first heat exchanger 28a is provided in the first cooling circuit 26a and a second heat exchanger 28b is provided in the second cooling circuit ^J 26b. Both heat exchangers 28a and 28b are air-cooled in a conventional manner and can be arranged separately or in combination, for example, in a common housing or with a common fan, etc.

Reference is now made to FIG. 3, which shows a further exemplary embodiment. As before, reference numerals corresponding to the two exemplary embodiments described above are used in FIG.

FIG. 3 shows a cooling system 10 ″ which, like the cooling system 10 ′ according to FIG. 2, has two cooling circuits 26c and 26d which are independent of one another. The cooling system 10 ″ shown here is moreover adapted to the fact that the second cooling circuit 26d is suitable for the fact that its coolant 24a is caused by raw water or in particular by sea or Sea water is formed and that the first cooling circuit 26c is cooled by the second cooling circuit 26d.

The second cooling circuit 26d has a coolant pump 23c, which is therefore designed in the manner of a sea or sea water pump, which draws raw water, for example sea or sea water, as is customary in particular from ships, directly from the environment and in the second Cooling circuit 26d circulates. The first cooling circuit 26c has a heat exchanger 28c, which is designed such that it transfers heat or energy from the first cooling circuit 26c or from a coolant 24 circulating in the first cooling circuit 26c to the second cooling circuit or its coolant 24a and excess energy or heat can be removed by the coolant 24a of the second cooling circuit 26d.

For this purpose, areas 30 are provided in the first cooling circuit 26c, which enable energy or heat transfer from the first cooling circuit 26c or its coolant 24 to the second cooling circuit 26d or its coolant 24a. These areas 30 can be formed, for example, by a wall of the cooling circuit 26c, the wall being common to the cooling circuits 26c and 26d, for example, or a first wall of the cooling circuit 26c being adjacent to a wall of the cooling circuit 26d such that energy or heat transfer takes place can.

According to the present exemplary embodiment, the second cooling circuit 24d is designed in such a way that it has two strands 34a and 34b arranged in parallel, both of which are supplied with coolant 24a by the coolant pump 23c and whose coolant 24a, used coolant 24a of higher temperature or higher energy, is discharged together or in the present case is returned to the surrounding water via a common outlet.

Only the first strand 34a feeds the coolant 24a to the heat exchanger 28c for cooling or for removing energy from the first cooling circuit 26c. The second line 34b supplies coolant 24a to a charge air supply 22 in order to cool it or to transfer energy or heat from the charge air to the coolant 24a in corresponding areas 30, which can be formed, for example, by a wall of the cooling line 30 enable. According to the exemplary embodiment shown in FIG. 3, the regions 30 assigned to the exhaust gas outlet 16, the turbocharger 18, the exhaust gas recirculation 20 and the charge air supply 22 are arranged in a common unit or they form one. In addition, the heat exchanger 28c and thus the areas 30 which enable an energy transfer from the first cooling circuit 26c to the second cooling circuit 26d or their respective coolant 24, 24c, as well as the coolant pump 23c, which the coolant 24c in the form of raw water or the like second cooling circuit 24c conducts, integrated in the unit 32.

Claims

claims

1. Cooling system (10, 10 ', 10' ') of an internal combustion engine, with a plurality of assemblies or parts to be cooled by means of coolant (24, 24a) circulating in the cooling system (10, 10', 10 ''), which are several of the has areas (30) assigned to the respective assemblies or the respective component, in which energy is transferred from the assembly or the component to the coolant (24, 24a), characterized in that at least two areas (30) assigned to different assemblies or components ) are arranged in a common unit (32).

2. Cooling system according to claim 1, characterized in that at least two of the areas (30) are arranged in parallel and / or in series.

3. Cooling system according to claim 1 or 2, characterized in that at least two of the areas (30) are supplied independently of one another with coolant (24, 24a) or are arranged in mutually independent cooling circuits (26, 26a, 26b, 26c, 26d) ,

4. Cooling system according to claim 3, characterized in that at least one of the assemblies is formed by one of the cooling circuits (26, 26a, 26b, 26c, 26d).

5. Cooling system according to one or more of the preceding claims, characterized in that the unit (32) adjoins the internal combustion engine or forms part of the same.

6. Cooling system according to one or more of the preceding claims, characterized in that it is in the Assemblies or the component to a turbocharger (18) and / or an exhaust gas recirculation (20) and / or a cylinder head (14) and / or an engine block (12) and / or an exhaust gas outlet (16) and / or a charge air supply ( 22) acts.

7. Cooling system according to one or more of the preceding claims, characterized in that at least one of the regions (30) is arranged in such a way that an energy transfer from two modules / parts can take place.

8. Cooling system according to claim 7, characterized in that the assemblies / parts adjoin each other.

9. Cooling system according to one or more of the preceding claims, characterized by at least one coolant pump (23, 23a, 23b, 23c), which coolant (24, 24a) in the cooling system (10) or one or more of the cooling circuits (26, 26a , 26b, 26c, 26d).

10. Internal combustion engine with a cooling system (10, 10 ', 10' ') according to one or more of the preceding claims.

11. Internal combustion engine according to claim 9, adapted to use at least substantially on land or water.

12. Internal combustion engine according to one or more of claims 9 to 11, characterized in that it is provided substantially stationary or mobile, for example in a vehicle or ship.

13. Internal combustion engine according to one or more of claims 9 to 12, characterized in that the internal combustion engine is a diesel, gas or gasoline engine.