EP2077387A1 - Method for cooling a recirculated exhaust gas flow of an internal combustion engine - Google Patents

Abstract

The method involves diverting recirculated exhaust gas flow from an exhaust gas mass flow by return pipes (7a, 7b), and conducting the recirculated exhaust gas flow over a discharge opening of a cylinder of an internal combustion engine. An exhaust gas pipe is connected to a discharge opening, and the exhaust gas pipe of the cylinder within a cylinder head by forming an exhaust manifold at a common exhaust gas pipe. The exhaust manifold is completely integrated in the cylinder head. The recirculated exhaust gas flow within the cylinder head is diverted by the return pipes.

Description

The invention relates to a method for cooling a recirculating exhaust gas mass flow, which is diverted by means of a return line of an exhaust gas mass flow, which is discharged from at least one outlet of at least one provided in a cylinder head cylinder of an internal combustion engine, wherein the recirculated exhaust gas mass flow fed after leaving the cylinder head of a cooling device and is cooled.

In order to comply with the future limit values for pollutant emissions, state-of-the-art internal combustion engines are equipped with different and optionally several exhaust aftertreatment systems.

In addition, however, further action is required. The focus is on the reduction of nitrogen oxide emissions, which are particularly relevant for diesel engines. Since the formation of nitrogen oxides requires not only an excess of air but also high temperatures, a concept for reducing nitrogen oxide emissions is to develop combustion processes with lower combustion temperatures.

wobei m_AGR die Masse an zurückgeführtem Abgas und m_Frischiuft die zugeführte und gegebenenfalls komprimierte Frischluft bzw. Ladeluft bezeichnet.In this case, the exhaust gas recirculation ie the return of combustion gases from the exhaust pipe into the intake pipe or from the exhaust gas side to the intake side targeted, in which the nitrogen oxide emissions can be significantly reduced with increasing exhaust gas recirculation rate. The exhaust gas recirculation rate x _{EGR is} determined as follows: $${\mathrm{x}}_{\mathrm{AGR}}={\mathrm{m}}_{\mathrm{AGR}}/\left({\mathrm{m}}_{\mathrm{AGR}}+{\mathrm{m}}_{\mathrm{fresh\; air}}\right)$$

where m _{AGR denotes} the mass of _recirculated exhaust gas and m _Frischiuft the supplied and optionally compressed fresh air or charge air.

Exhaust gas recirculation is also suitable for reducing emissions of unburned hydrocarbons in the partial load range.

In order to achieve a significant reduction in nitrogen oxide emissions, high exhaust gas recirculation rates are required, which can be on the order of x _AGR ≈ 50% to 70%.

The line for returning the exhaust gas d. H. the return line is usually branched off from the entire exhaust line, namely downstream or upstream of an exhaust aftertreatment system provided in the entire exhaust line, or downstream or upstream of a turbine of an exhaust gas turbocharger.

But concepts are also known from the prior art, in which the return line branches off from the exhaust manifold or a single exhaust pipe within the cylinder head, so that the Abgriffsstelle is integrated for exhaust gas recirculation in the cylinder head. A cylinder head with such exhaust gas recirculation is for example the subject of GB 2 370 073 A ,

According to the prior art, an additional cooler or a cooling device is provided in the return line through which passes the return line and with which the recirculated exhaust gas is cooled.

By means of the cooling device, the temperature is lowered in the hot recirculating exhaust gas mass flow and thus increases the density of the exhaust gases. By increasing the density, the volume is reduced, resulting in a decrease in flow losses.

The temperature of the cylinder fresh charge, which occurs in the mixture of fresh air sucked with the recirculated exhaust gases, is consequently also lowered, which is why the cooling device contributes to a better filling of the combustion chambers or the cylinder with fresh mixture.

In addition, the thermal load of a downstream of the cooling device provided in the return line valve for controlling the return rate (EGR valve) and / or a seal decreases, so lower quality requirements of the valve or the seal can be made.

While an uncooled exhaust gas mass flow in an individual case an EGR valve with integrated cooling, as for example in the EP 0 908 615 A2 The use of such an EGR valve may prove unnecessary when cooling the recirculating exhaust gas mass flow.

Optionally, the EGR valve can be made of less temperature-resistant and thus less expensive materials than if the recirculated exhaust gas mass flow would not be cooled.

In the cooling device used in the prior art is arranged adjacent to the cylinder head heat exchanger, in which the recirculated exhaust gas is introduced via return line and forwarded from which the cooled recirculated exhaust gas in turn by means of return line in the inlet region or on the intake side of the internal combustion engine becomes.

This procedure for cooling the recirculated exhaust gas mass flow has several disadvantages. On the one hand, an additional component, namely the cooling device, must be provided, which increases the mounting requirement and the manufacturing costs. In particular, the need to move return lines to the cooling device now and then away from the cooling device, make such cooling devices consuming.

On the other hand, the length of the return line increases considerably in that the return line to the cooling device now and then has to be led away from the cooling device. With the length, the volume of the return line increases, whereby the response of the exhaust gas recirculation worsened. The latter adversely affects the transient operation of the internal combustion engine.

Against the background of the above, it is the object of the present invention to provide a method for cooling a recirculating exhaust gas mass flow according to the preamble of claim 1, with which the known from the prior art disadvantages are overcome.

This object is achieved by a method for cooling a recirculating exhaust gas mass flow, which by means of a return line of an exhaust gas mass flow is branched off, which is discharged from at least one outlet of at least one provided in a cylinder head cylinder of an internal combustion engine, wherein the recirculating exhaust gas mass flow is fed and cooled after leaving the cylinder head of a cooling device, and which is characterized in that a unit of the internal combustion engine is used as a cooling device , which already has at least one additional task in the context of the operation of the internal combustion engine.

According to the invention, an already existing component is used for the cooling of the exhaust gas flow to be recirculated d. H. a component which is provided anyway, even if the intention to cool the recirculated exhaust gas, would not exist, because this component - without prejudice to the cooling of the exhaust gas recirculation - in the operation of the internal combustion engine is used or necessary.

As a component or aggregate for cooling the recirculating exhaust gas flow d in the present invention. H. Thus, according to the method according to the invention, each component or each group of components is used, the one or more already - in addition to the object of the exhaust gas cooling according to the invention - at least one further function d. H. Task with regard to the operation of the internal combustion engine.

In this respect, according to the invention no additional and serving exclusively as a cooling device unit is used, but used an existing and already required for the operation of the internal combustion engine component for cooling or as a cooling device.

In contrast to the prior art, no additional monofunctional component is provided for cooling the recirculating exhaust gas flow, so that the number of components due to the cooling of the exhaust gas recirculation (EGR) does not increase, which simplifies the assembly and reduces the manufacturing cost.

Furthermore, the inventive method allows a compact design of the entire drive unit and thus the densest possible packaging in the engine compartment, which is considered to be advantageous. As a result of the procedure according to the invention, the length of the return line is also shortened as a rule, in particular if a component is used as the cooling device, which component is immediately adjacent to the cylinder head Exhaust manifold or the Abgriffsstelle the exhaust gas recirculation or the return line is arranged.

With the reduction of the line length and the volume of the return line decreases, which is why the response of the exhaust gas recirculation improves. An internal combustion engine, in which the exhaust gas to be recirculated is cooled using the method according to the invention, thus has an exhaust gas recirculation with improved response and thus a fundamentally improved transient operating behavior.

With the method according to the invention, the object underlying the invention is thus achieved, namely to show a method for cooling a recirculated exhaust gas mass flow, with which the disadvantages known from the prior art are overcome.

Further advantageous embodiments of the method are discussed in connection with the subclaims.

Advantageous embodiments of the method in which the recirculated exhaust gas mass flow is fed by means of return line again to the cylinder head, wherein the cylinder head is used as a cooling device.

The cylinder head is within the meaning of the present invention, an aggregate of the internal combustion engine, which already has at least one additional task in the context of the operation of the internal combustion engine.

Together with the cylindrical tubes provided in the cylinder block and the pistons guided in the cylinder tubes, the cylinder head forms the combustion chambers of the internal combustion engine.

The cylinder head is often used to hold the valve train. In order to control the charge cycle, an internal combustion engine requires control means and actuators to operate these controls. As part of the change of charge, the expulsion of the combustion gases via the outlet openings and the filling of the combustion chamber that is done Sucking the fresh mixture or the fresh air through the inlet openings. To control the charge cycle four-stroke engines almost exclusively lift valves are used as control members that perform an oscillating lifting movement during operation of the internal combustion engine and thus release the inlet and outlet ports and close. The required for the movement of the valves valve actuating mechanism including the valves themselves is referred to as a valve train.

It is the task of the valve train to open the intake and exhaust ports of the combustion chamber in time or close, with a quick release of the largest possible flow cross sections is sought to keep the throttle losses in the incoming and outflowing gas flows low and the best possible filling of the Combustion chamber with fresh mixture or an effective d. H. To ensure complete removal of the exhaust gases. Therefore, according to the prior art, increasingly two or more inlet or outlet openings are provided, but at least one inlet opening and at least one outlet opening.

The inlet ducts leading to the inlet openings and the outlet ducts or exhaust ducts adjoining the outlet openings are at least partially integrated in the cylinder head according to the prior art. The exhaust pipes of the cylinders are usually combined to form an overall exhaust gas line. The merging of the exhaust pipes to the entire exhaust line is referred to in general and in the context of the present invention as exhaust manifold or manifold. The exhaust manifold may be partially or fully integrated in the cylinder head.

Downstream of the manifold, the exhaust gases are optionally supplied to the turbine of an exhaust gas turbocharger and / or one or more exhaust aftertreatment systems.

Advantageous embodiments of the method, in which the cylinder head with a coolant jacket d. H. a liquid cooling is equipped.

In principle, it is possible to carry out the cooling of the cylinder head in the form of air cooling or liquid cooling. Due to the significantly higher heat capacity of liquids compared to air can with the liquid cooling much larger amounts of heat are dissipated, which is why the thermally highly loaded cylinder head is preferably equipped with a liquid cooling.

The liquid cooling requires the equipment of the cylinder head with a coolant jacket d. H. the arrangement of the coolant through the cylinder head leading coolant channels, which causes a complex structure of the cylinder head construction. The heat is emitted inside the cylinder head to the coolant, usually mixed with additives added water. The coolant is conveyed by means of a pump arranged in the cooling circuit, so that it circulates in the coolant jacket. The heat given off to the coolant is removed in this way from the interior of the cylinder head and removed from the coolant in a heat exchanger again.

According to the embodiment in question, the exhaust gas mass flow to be recirculated is fed again by means of return line to the cylinder head, wherein the exhaust gas mass flow is cooled in the cylinder head. In this case, the exhaust gas releases heat to the cylinder head, in particular to the liquid cooling integrated in the cylinder head, so that the cylinder head is used or used as a cooling device. The heat given off by the exhaust gas to the coolant is then released into the environment in the heat exchanger provided outside the cylinder head.

An additional exhaust gas cooler d. H. an additional heat exchanger for cooling the exhaust gas is therefore not required.

Embodiments in which the coolant jacket integrated in the cylinder head at least partially surrounds the return line are advantageous. In this way, the recirculated exhaust gas is cooled particularly effectively.

Embodiments of the method in which the exhaust gas mass flow to be recirculated is fed by means of a return line to a component adjacent to the cylinder head are advantageous, the adjacent component being used as a cooling device.

To the cylinder head a plurality of components that is to aggregates, which perform a required for the operation of the internal combustion engine task.

As a component adjacent to the cylinder head, within the scope of the present invention, any component is considered which adjoins the cylinder head without spacing or indirectly, for example separated only by a gasket. connects, is connected to the cylinder head and the already - in addition to the recording of the return line according to the invention - at least one further function d. H. Task with regard to the operation of the internal combustion engine.

In this respect, an already existing and already required for the operation of the internal combustion engine component for cooling the recirculating exhaust gas mass flow is used again.

Embodiments of the method in which a component which has liquid cooling is used as the adjacent component are advantageous. As has already been explained above, substantially greater amounts of heat can be dissipated with liquid cooling than with air cooling, in which heat is removed by means of an air flow guided over the surface of the component. The more heat is removed from the exhaust gas, the stronger the temperature in the recirculating exhaust gas flow can be reduced, which is why the temperature of the cylinder fresh charge can be lowered significantly or can be influenced in a wider temperature range.

Advantageously, the walls of the adjacent component forming the liquid cooling system are formed as large as possible in order to increase the heat transfer by convection, which can be done for example by the arrangement of cooling fins or cooling knobs. The cooling ribs or cooling knobs can be arranged or formed both on the coolant side and on the exhaust side. In particular, cooling fins on the exhaust side are advantageous.

The same applies analogously to the walls of the integrated in the cylinder head coolant jacket, if the cylinder head is used as a cooling device or in general.

Embodiments of the method in which the liquid cooling of the adjacent component is connected to the coolant jacket, ie the liquid cooling of the cylinder head, are advantageous. According to this variant of the method form the two Liquid cooling a common coolant circuit, so that basically only one pump for conveying the coolant and only one heat exchanger must be provided for dissipating the heat to the environment.

Embodiments of the method are advantageous, for example, in which a coolant housing which serves to supply coolant to the coolant jacket of the cylinder head and / or to discharge coolant from the coolant jacket of the cylinder head is used as adjoining component. A coolant housing, with which coolant is guided into and out of the cylinder head, is inherently an adjoining component whose fluid cooling is connected to the liquid cooling of the cylinder head.

Particularly advantageous embodiments of the method, in which a water outlet housing is used as the coolant housing.

Advantageous embodiments of the method in which the recirculated exhaust gas mass flow is diverted within the cylinder head by means of return line.

According to this variant of the method, the tapping point for exhaust gas recirculation is integrated into the cylinder head. The integrated into the cylinder head tapping point allows the one-piece design of manifold and return line d. H. the avoidance of training and thus the sealing of a non-positive connection point between the manifold and return line. Furthermore, the integration of the tapping point leads to a reduction in the number of components and to a more compact design. The latter also supports the effort to achieve as dense as possible a packaging of the drive unit in the engine compartment. In addition, the integration of the tap point in the cylinder head usually leads to a shortening of the return line with the already mentioned above advantages.

A cylinder head with a built-in cylinder head tapping point for exhaust gas recirculation describes, for example, the GB 2 370 073 A , The return line branches off from a partial exhaust gas line of a cylinder with two outlet openings.

The outlet channels or exhaust pipes, which adjoin the outlet openings are at least partially integrated in the cylinder head according to the prior art. The exhaust pipes of the outlet openings of a single cylinder are, for example - as in the GB 2 370 073 A disclosed - merged within the cylinder head to a cylinder associated with the partial exhaust gas line, these partial exhaust gas lines are then merged outside the cylinder into a single overall exhaust gas line.

The exhaust manifold can also be fully integrated into the cylinder head. Such a cylinder head, in which connects to each outlet opening an exhaust pipe and merge the exhaust pipes of the cylinder within the cylinder head to an overall exhaust line, characterized by a very compact design, the total distance of the exhaust pipes of the exhaust manifold is reduced. The use of such a cylinder head also leads to fewer components and consequently to a reduction in costs, in particular the assembly and deployment costs.

Such a cylinder head is preferably equipped with a powerful cooling, since the thermal load is much higher than in a conventional cylinder head, which is equipped with an at least partially external manifold. The powerful cooling offers advantages in the cooling of the recirculating exhaust gas mass flow, in particular when the cylinder head is used as a cooling device.

However, embodiments of the method in which the recirculated exhaust gas mass flow is diverted outside the cylinder head by means of a return line are also advantageous.

If the exhaust branched off downstream of the exhaust manifold, the Abgriffsstelle exhaust gas recirculation is usually outside of the cylinder head. The return line must be connected to the entire exhaust line, for example by means of a flange connection. The joint is on the one hand a potential leakage point for the unwanted escape of exhaust gases, which implies high demands on the seal. On the other hand, this connection is thermally highly loaded by the hot exhaust gases, so that high demands are placed on the execution of the connection.

Embodiments of the method in which an EGR valve provided in the return line and which serves to control the return rate are arranged downstream of the cooling device in the return line are advantageous.

A downstream provided EGR valve is thermally less heavily loaded, so that optionally can be dispensed with cooling of the EGR valve or less temperature-resistant and thus cheaper materials can be used to produce the valve.

The use of the method according to the invention is advantageous, in particular, in a supercharged internal combustion engine, since exhaust gas recirculation and charging are frequently used in combination and a supercharged internal combustion engine is subject to a higher thermal load, because the exhaust gas temperatures are comparatively high, so that the use of a cooling device for cooling the recirculated exhaust gas is particularly advantageous and recommended.

In addition, the dimensioning d. H. Determining the length of the exhaust ducts in supercharged internal combustion engines with respect to the combustion process of lesser importance than uncharged internal combustion engines, so that in turbocharged internal combustion engines, the generally short length of a - at least partially - integrated in the cylinder head manifold has no negative impact on the performance of the internal combustion engine.

In this respect, the inventive method is particularly advantageous in a supercharged internal combustion engine, which is equipped with a cylinder head having a fully integrated exhaust manifold.

The use of the method according to the invention is advantageous in particular in internal combustion engines which are charged by means of turbocharging. In these internal combustion engines, the turbine of an exhaust gas turbocharger is arranged in the overall exhaust line, thereby increasing the exhaust pressure upstream of the turbine and thus the exhaust pressure in the manifold, which increases the pressure gradient between the exhaust side and suction side and supports the flow of exhaust gas in the return line, if assumed is that the return line upstream of the turbine branches off from the entire exhaust line or the manifold.

• Fig. 1 eine Ausführungsform des Zylinderkopfes in einer perspektivischen Darstellung mit Blick auf die Montagestirnseite,
• Fig. 2a ein an den Zylinderkopf angrenzendes Bauteil in einer perspektivischen Darstellung mit Blick auf die Montagestirnseite, und
• Fig. 2b das in Figur 2a dargestellte Bauteil in einer perspektivischen Darstellung mit Blick auf die der Montagestirnseite gegenüberliegende Seite des Bauteils.

In the following the invention with reference to an embodiment according to the Figures 1 to 2b described in more detail. Hereby shows:

• Fig. 1 an embodiment of the cylinder head in a perspective view with a view of the mounting end face,
• Fig. 2a a component adjacent to the cylinder head in a perspective view with a view of the mounting end face, and
• Fig. 2b this in FIG. 2a shown component in a perspective view with a view of the mounting end side opposite side of the component.

FIG. 1 shows an embodiment of the cylinder head 13 in a perspective view with a view of the mounting end face 14a, on which the cylinder head 13 with the in the FIGS. 2a, 2b is shown connected to the component or to this component to the cylinder head 13 connects.

The cylinder head 13 has two return lines 7a ', 7b' open to the assembly end face 14a for the exhaust gas to be recirculated. The return line 7a 'branches off inside the cylinder head 13 from the exhaust manifold for discharging the exhaust gases, and exits from the cylinder head 13 at the mounting face 14a to guide the exhaust mass flow to be recirculated to the adjoining component serving as the cooling device.

Thus, the recirculating exhaust gas mass flow after leaving the cylinder head 13 of a cooling device 15 is supplied and cooled.

The cylinder-head-side return lines 7a ', 7b' form part of the complete return lines 7a, 7b, which only in the assembled state from the combination of the cylinder head-side return lines 7a ', 7b' with the component-side return lines 7a 'corresponding to these return lines 7a', 7b '. , 7b "put together ie result (see also FIG. 2a ).

A first return line 7a, 7a 'runs upstream from an EGR valve which is attached to the adjacent component, whereas the second return line 7b, 7b' leads downstream from the EGR valve (see also FIGS FIGS. 2a and 2b ).

The exhaust gas flow branched off and returned from the exhaust manifold within the cylinder head 13 flows at the inlet A into the return line 7a, 7a 'and leaves this return line 7a, 7a' at the outlet B to pass the EGR valve. After flowing through the EGR valve, this exhaust gas stream enters the second return line 7b, 7b 'at the inlet C, flows through it and leaves the return line 7b, 7b' at the outlet D. In this case, the exhaust gas stream is cooled.

The cylinder head 13 is equipped with a liquid cooling 17a ', 17b' and has two cylinder-side coolant channels 17a ', 17b', which pierce the mounting end face 14a and pass into the adjacent component. The coolant channels 17a ', 17b' are used for discharging coolant from the coolant jacket of the cylinder head 13 and at the same time supplying coolant into the adjacent component.

Furthermore, a line 20 'for venting the crankcase is integrated into the cylinder head 13, which also pierces the mounting end face 14a and merges into the adjacent component.

FIG. 2a shows a component 16 adjacent to the cylinder head in a perspective view with a view of the mounting end face 14b. FIG. 2b shows this component 16 also in a perspective view, but with a view of the mounting end face 14b opposite side of the component 16th

That in the FIGS. 2a, 2b illustrated water outlet is a to the cylinder head according to FIG. 1 adjacent component 16, which adjoins in the mounted state without distance or indirectly via an intermediate seal to the cylinder head ie adjoins and is connected to the cylinder head by the mounting end face 14b of the Wasserauslaßgehäuses placed flush on the mounting end face of the cylinder head and bolted.

In addition to receiving the return line 7a, 7b for cooling the recirculating exhaust gas flow, the water outlet has the primary task to dissipate the coolant from the cylinder head d. H. To control or ensure the coolant outflow from the cylinder head.

In this respect, an aggregate or component 16 of the internal combustion engine is used as a cooling device 15 with the water outlet, which already has a further task in the context of the operation of the internal combustion engine.

The water outlet housing has two return lines 7a ", 7b" for the exhaust gas to be returned, which are open towards the assembly end face 14b. These housing-side return lines 7a ", 7b" form part of the complete return lines 7a, 7b, which are formed only in combination with the cylinder head-side return lines 7a ', 7b' (see also FIG FIG. 1 ). With regard to the flow path of the exhaust gas to be recirculated, reference is made to the statements already made above.

The water outlet housing has two housing-side coolant channels 17a ", 17b", which are open to the mounting end face 14b and connect to the cylinder head side coolant channels. Thus, the Wasserauslaßgehäuse with a liquid cooling 17a ", 17b" is equipped, which communicates with the liquid cooling of the cylinder head d. H. connected is.

An integrated in the water outlet housing line 20 "for venting the crankcase connects to the provided in the cylinder head vent line and pierces the mounting end face 14b.

As FIG. 2b can be removed, the water outlet on a recess 19 for receiving a thermostat. An attachment flange 18 provided on the housing serves to connect an EGR valve. At this time, the exhaust gas to be recirculated flows from the housing at the inlet 18a into the EGR valve, back through the valve, and back into the housing at the outlet 18b, where it is cooled again as it flows through the second return pipe 7b.

reference numeral

7a

Return line upstream of the EGR valve

7b

Return line downstream of the EGR valve

7a '

Cylinder-head-side return line upstream of the EGR valve

7b '

Cylinder head side return line downstream of the EGR valve

7a "

Component-side return line upstream of the EGR valve

7b "

Component-side return line downstream of the EGR valve

13

cylinder head

14a

Mounting front side of the cylinder head

14b

Mounting end face of the water outlet housing

15

cooler

16

adjacent component

17a '

Cylinder-head-side coolant channel, liquid cooling of the cylinder head

17b '

Cylinder-head-side coolant channel, liquid cooling of the cylinder head

17a "

component-side coolant channel, liquid cooling of the adjacent component

17b "

component-side coolant channel, liquid cooling of the adjacent component

18

mounting flange

18a

Inlet EGR valve

18b

Outlet EGR valve

19

recess

20 '

Cylinder-head-side pipe for venting the crankcase

20 "

Component-side line for venting the crankcase

A

Entry into the return line 7a

B

Exit from the return line 7a

C

Entry into the return line 7b

D

Exit from the return line 7b

Claims (10)

A method for cooling a recirculating exhaust gas mass flow, which is branched off by means of a return line (7a, 7b) of an exhaust gas mass flow, which is discharged from at least one outlet of at least one provided in a cylinder head (13) cylinder of an internal combustion engine, wherein the exhaust gas mass flow to be recirculated after leaving the cylinder head (13) is supplied to a cooling device (15) and cooled, characterized in that a unit of the internal combustion engine is used as a cooling device (15), which already has at least one further task in the context of operation of the internal combustion engine. A method according to claim 1, characterized in that the recirculating exhaust gas mass flow by means of return line (7a, 7b) is again supplied to the cylinder head (13), wherein the cylinder head (13) is used as a cooling device (15). A method according to claim 1 or 2, characterized in that the cylinder head (13) with a coolant jacket ie a liquid cooling (17a ', 17b') is provided. A method according to claim 1 or 2, characterized in that the recirculating exhaust gas mass flow means of return line (7a, 7b) to the cylinder head (13) adjacent component (16) is supplied, said adjacent component (16) is used as a cooling device (15) , A method according to claim 4, characterized in that as an adjacent component (16), a component (16) is used which has a liquid cooling (17a ", 17b"). A method according to claim 5, characterized in that the liquid cooling (17a ", 17b") of the adjacent component (16) with the liquid cooling (17a ', 17b') of the cylinder head (13) is connected. Method according to one of claims 4 to 6, characterized in that as an adjacent component (16) a coolant housing is used, which is the supply of coolant into the coolant jacket of the cylinder head (13) and / or the discharge of coolant from the coolant jacket of the cylinder head ( 13) is used. A method according to claim 7, characterized in that a water outlet housing is used as the coolant housing. Method according to one of the preceding claims, characterized in that the recirculating exhaust gas mass flow within the cylinder head (13) by means of return line (7a, 7b) is branched off. Method according to one of claims 1 to 8, characterized in that the recirculated exhaust gas mass flow outside of the cylinder head (13) is branched off by means of return line.

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