DE102019128121A1 - Motor vehicle, in particular a motor vehicle, and a method for operating such a motor vehicle - Google Patents

Abstract

The invention relates to a motor vehicle (1) with an internal combustion engine (2) by means of which the motor vehicle (2) can be driven, with at least one exhaust gas component (8) which has at least one exhaust gas duct (9) through which exhaust gas from the internal combustion engine (2) can flow , and with an application device (15), by means of which at least one signal characterizing an accident of the motor vehicle (1) can be determined and, depending on the signal, the exhaust gas component (8) can be acted upon directly with a cooling fluid for cooling the exhaust gas component (8), the Cooling fluid is designed as a cooling liquid flowing through a cooling circuit (16) of the motor vehicle (1), by means of which at least one component (2, 3) of the motor vehicle (1) different from the exhaust gas component (8) and arranged in the cooling circuit (16) is cooled is.

Description

The invention relates to a motor vehicle, in particular a motor vehicle, according to the preamble of claim 1. Furthermore, the invention relates to a method for operating a motor vehicle, in particular a motor vehicle, according to the preamble of claim 8.

The DE 10 2013 011 829 A1 discloses a motor vehicle with an internal combustion engine and with an air conditioning device operated by means of a refrigerant. Furthermore, the DE 10 2014 009 849 A1 a spray device for a motor vehicle as known. The spray device comprises at least one tank for receiving a fluid which is designed to bind fluoride ions. In addition, a spray element is provided with which at least one component of the motor vehicle can be at least partially exposed to the fluid from the tank. In addition, from the DE 10 2015 212 725 A1 a motor vehicle is known which has at least one high-temperature component and a refrigerant circuit with a refrigerant enclosed therein.

The object of the present invention is to create a motor vehicle and a method for operating such a motor vehicle so that a particularly high level of safety can be achieved.

According to the invention, this object is achieved by a motor vehicle with the features of claim 1 and by a method with the features of claim 8. Advantageous embodiments of the invention are the subject of the dependent claims.

A first aspect of the invention relates to a motor vehicle, preferably designed as a motor vehicle, in particular as a passenger vehicle, which comprises an internal combustion engine designed, for example, as a reciprocating piston engine and also referred to as a motor or internal combustion engine. By means of the internal combustion engine, the motor vehicle can be driven, in particular purely, by an internal combustion engine. The motor vehicle also has at least one exhaust gas component which has at least one exhaust gas duct through which exhaust gas from the internal combustion engine can flow. The exhaust gas from the internal combustion engine can thus be routed by means of the exhaust gas component, which is also referred to as an exhaust gas routing component.

The motor vehicle also has an application device by means of which at least one signal characterizing an accident in the motor vehicle, in particular an electrical or electronic signal, can be determined. This can in particular be understood to mean that the application device can provide and / or receive the signal. For example, the application device comprises at least one electronic computing device, by means of which the, in particular electrical, signal can be provided and / or received. For example, the signal is provided by a first component, such as a sensor, and received by a second component, wherein, for example, the first component and / or the second component can be a part or component of the application device, in particular the electronic computing device.

By means of the application device, a cooling fluid can be applied directly to the exhaust gas component as a function of the signal and thus as a function of the accident. This can in particular be understood to mean that the cooling fluid provided by the application device, in particular sprayed or squirted out, directly touches the exhaust gas component, in particular an inside and / or outside surface of the exhaust gas component, for example, and thus can contact so that the exhaust gas component, in particular the surface, at least partially acted upon directly with the cooling fluid, in particular wetted, can be. The surface is or comprises, for example, an outer circumferential lateral surface of the exhaust gas component facing away from the exhaust gas channel, also simply referred to as the channel, and thus, for example, facing the surroundings of the exhaust gas component, or the surface is or includes, for example, one facing the channel and in particular directly delimiting the channel and thus, for example, the Surrounding the exhaust gas component facing away, inner circumferential lateral surface of the exhaust gas component. By directly acting on the exhaust gas component with the cooling fluid, the exhaust gas component, in particular on the outside and / or inside, can be cooled by means of the cooling fluid. For example, the signal characterizes an accident-related application of force to the motor vehicle, wherein, for example, the accident-related application of force is detected by means of the aforementioned sensor. The sensor is, for example, an acceleration sensor, by means of which an acceleration is detected when force is applied to the motor vehicle as a result of an accident. The sensor provides the signal which, for example, characterizes the acceleration detected by means of the sensor and thus the force application due to the accident.

In order to be able to realize a particularly high level of safety for the motor vehicle, it is provided according to the invention that the cooling fluid is used as a cooling circuit of the motor vehicle through which cooling liquid flowing through is formed, by means of which at least one component of the motor vehicle that is different from the exhaust gas component and is provided in addition to the exhaust gas component and is arranged in the cooling circuit can be cooled. In other words, the motor vehicle comprises the cooling circuit and the at least one component which is arranged in the cooling circuit. The cooling liquid can flow through the cooling circuit and thus the component. The component can be cooled, for example, by a heat transfer from the component to the cooling fluid flowing through the component. Since the cooling fluid is designed as a cooling liquid, the component can be cooled particularly effectively. In addition, the exhaust gas component can be effectively and efficiently cooled by means of the cooling liquid, so that an excessively high temperature of the exhaust gas component can be avoided, for example in the event of an accident in the motor vehicle. In this way, for example, effects resulting from an accident in the motor vehicle and caused by an excessively high temperature of the exhaust gas component, such as, for example, inflammation or inflammation, can be avoided or the probability of such effects can be kept particularly low.

For example, the motor vehicle has an air conditioning system which is designed as a compression refrigeration machine. The air conditioning system has, for example, a refrigerant circuit that is different from the cooling circuit and is provided in addition to the cooling circuit, through which a refrigerant that is different from the cooling liquid and is additionally provided for this can flow. For example, the interior of the motor vehicle can be supplied with cooled air by means of the air conditioning system.

Furthermore, it is conceivable that the motor vehicle has at least one medium which is, for example, different from the cooling fluid and is additionally provided, which is, for example, the aforementioned refrigerant. The medium has, for example, an ignition or ignition temperature above which, or when it is reached, the medium is or is ignited or ignited. It is preferably provided that the exhaust gas component is cooled by means of the cooling liquid in such a way that the cooling effected by means of the cooling liquid generates or sets a lower temperature of the exhaust gas component than the ignition temperature. The ignition temperature is also referred to as the flame temperature or flash point.

The exhaust gas component is, for example, a cylinder head, an engine block or another component that conducts exhaust gas. In particular, it is conceivable that the exhaust gas component is arranged in an engine compartment of the motor vehicle, in the engine compartment of which the internal combustion engine is also arranged. In the event of an accident, for example, at least a part of the engine compartment, in particular at least a predominant part of the engine compartment or the entire engine compartment, is flooded with the cooling liquid by means of the application device. As a result, the cooling liquid comes into direct contact with the exhaust gas component, so that the exhaust gas component is cooled by contact cooling, in particular by evaporation of the cooling liquid. In other words, because the cooling liquid comes into direct contact with the exhaust gas component, the cooling liquid evaporates, for example due to a high temperature of the exhaust gas component, whereby the exhaust gas component is effectively and efficiently cooled. Furthermore, it is conceivable that the exhaust gas components or their interior, for example the channel, is flooded with the cooling fluid by means of the application device, whereby the exhaust gas component can be effectively cooled. The feature that the inner circumferential lateral surface directly delimits the channel is to be understood in particular that the exhaust gas flowing through the channel touches or can touch the inner circumferential lateral surface directly.

Overall, it can be seen that the exhaust gas component, in particular the inner circumferential lateral surface and / or the outer circumferential lateral surface, can be effectively cooled by means of the cooling liquid, so that, for example, flammable media flowing out from possibly damaged media lines cannot ignite on the hot exhaust gas component. As a result, a particularly high level of safety can be achieved in a particularly simple and inexpensive manner, in particular in addition or as an alternative to a structural, spatial separation of a line for guiding the medium and the exhaust gas component, extinguishing devices, pyrotechnic devices for displacing the outflowing medium and / or guiding devices for the discharge of the medium. According to the invention, the cooling liquid has a double function. On the one hand, the cooling liquid is used, in particular in normal operation of the motor vehicle, in order to cool the component during normal operation. On the other hand, the cooling liquid is used, for example, in or as a result of an accident in the motor vehicle to cool the exhaust gas component directly and in a targeted manner in order to avoid undesirable effects resulting from the accident or to be able to keep the probability of such effects particularly low.

The loading device, also referred to simply as a device, is, for example, in Cylinder head or provided or arranged in the engine block. The loading device is preferably designed to allow the cooling liquid to flow into the engine compartment in the event of an accident.

It has been shown to be particularly advantageous if the internal combustion engine has at least one combustion chamber. During fired operation of the internal combustion engine, combustion processes take place in the combustion chamber, in the course of which respective fuel-air mixtures are burned. It has been shown to be particularly advantageous if the application device is designed to introduce the cooling liquid in the liquid state into the combustion chamber and, via the combustion chamber, in the liquid state into the exhaust gas duct for cooling the inside or the circumference of the exhaust gas component as a function of the signal, see above that the liquid cooling liquid touches the exhaust gas component on the inner circumference, that is to say the aforementioned, inner circumferential lateral surface of the exhaust gas component, and can thus cool effectively. For this purpose, the loading device is arranged, for example, at least partially in the cylinder head which, for example, forms a combustion chamber roof that partially delimits the combustion chamber. Furthermore, it is conceivable that the loading device is arranged at least partially in the engine block, which is designed as a dome housing, for example, and which, for example, forms a cylinder partially delimiting the combustion chamber. A piston is received in the cylinder such that it can move in translation, the piston partially delimiting the combustion chamber. As a result of the internal cooling of the exhaust gas component, its temperature can be lowered in a particularly advantageous manner and, in particular, brought below the flash point of the medium. Since the cooling liquid is preferably introduced in the liquid state into the exhaust gas component, in particular in the duct, via the combustion chamber, the combustion chamber, for example, is flooded with the cooling liquid, in particular in the liquid state. The application device preferably has a, in particular pyrotechnic or electrical or electrically controlled valve, via which the cooling liquid can be applied to the exhaust gas component, in particular the cooling liquid in the liquid state into the combustion chamber or via the combustion chamber into the exhaust gas component, in particular into the duct . In particular, the valve can be used to set a quantity of the cooling liquid with which the exhaust gas component is to be or is being acted upon directly. In a closed state of the valve, for example, the valve prevents the exhaust gas component from being exposed to the cooling liquid. In an open state of the valve, for example, the exhaust gas component, in particular the inner circumferential lateral surface and / or the outer circumferential lateral surface, is acted upon directly by the cooling liquid via the valve and is thereby cooled.

A particularly high level of security can be achieved in particular in that the cooling liquid, in particular predominantly or exclusively, comprises water. As a result, the exhaust gas component, in particular on the inside and / or on the outside, can be strongly cooled.

A particularly high level of safety can be achieved in a particularly simple manner, in particular, in that the component to be cooled by means of the cooling liquid is the internal combustion engine, in particular the engine block and / or cylinder head.

Another embodiment is characterized in that at least one cooler through which the cooling liquid can flow and which is different from the component and is provided in addition to the component is arranged in the cooling circuit, by means of which the cooling liquid is to be cooled. As a result, a temperature of the cooling liquid itself can be kept particularly low, so that the exhaust gas component can be cooled particularly effectively and efficiently.

For example, air can flow around the cooler, so that, for example, the cooling liquid can be cooled via the cooler in that heat is or can be transferred from the cooling liquid flowing through the cooler via the cooler to the air flowing around the cooler.

In a particularly advantageous embodiment of the invention, the loading device has at least one loading element, which has at least one outflow opening through which the cooling liquid can flow, via which the exhaust gas component, in particular the inner circumferential lateral surface and / or the outer circumferential lateral surface, can be acted upon directly with the cooling liquid, at least a part of the exhaust gas component, in particular the inner circumferential or outer circumferential lateral surface, is covered by the outflow opening. This means, for example, that the cooling liquid can be sprayed or squirted out of the impingement element through the outflow opening and thus via the outflow opening. Since the exhaust gas component is covered by the outflow opening, the cooling fluid flowing through the outflow opening hits the exhaust gas component directly after flowing through the outflow opening, without another, in addition to the impingement element and the To touch exhaust component provided component of the motor vehicle. As a result, the exhaust gas component can be cooled particularly effectively.

Finally, it has been shown to be particularly advantageous if the exhaust gas component is an exhaust manifold also referred to as an exhaust manifold or manifold. This embodiment is based in particular on the knowledge that the exhaust manifold usually and in particular during the fired operation of the internal combustion engine has a very high temperature. A particularly high level of safety can be achieved by cooling the exhaust manifold.

A second aspect of the invention relates to a method for operating a motor vehicle preferably designed as a motor vehicle, in particular as a passenger vehicle. In the case of the method, the motor vehicle has an internal combustion engine by means of which the motor vehicle can be or is driven. In the method, the motor vehicle also has at least one exhaust gas component which has at least one exhaust gas duct through which exhaust gas from the internal combustion engine can flow and which is also simply referred to as a duct.

In the method, the motor vehicle further comprises an application device, by means of which at least one signal characterizing an accident of the motor vehicle is determined and a cooling fluid is directly applied to the exhaust gas component as a function of the signal, whereby the exhaust gas component is cooled in a targeted manner. For example, by means of the application device, depending on the signal, an outer peripheral surface of the exhaust component facing away from the channel and, for example, facing the surroundings of the exhaust gas component, is specifically and directly applied to the cooling fluid, so that the cooling fluid directly contacts and in particular wets the outer peripheral surface. Alternatively or additionally, for example by means of the application device, depending on the signal, an inner peripheral surface of the exhaust gas component facing the channel and, for example, directly delimiting the channel, is applied directly and specifically to the cooling fluid, so that, for example, the cooling fluid directly contacts the inner peripheral surface and thus, for example, wets it .

The feature that the exhaust gas component is specifically acted upon with the cooling fluid and thereby specifically cooled is to be understood in particular that the application of the exhaust gas component with the cooling fluid and the resulting cooling of the exhaust gas component is carried out, in particular effected, in a targeted manner, that is to say is desired by, for example, at least one, in particular electrically operable, actuator, in particular by the actuation device, being controlled in a targeted manner. In other words, the targeted application and cooling is to be understood as meaning that the application and cooling is actively effected and does not result accidentally or arbitrarily from the accident or accident of the motor vehicle or, for example, from an arbitrary or accidental leakage.

In order to be able to realize a particularly high level of safety of the motor vehicle, it is provided in the method according to the invention that a cooling liquid is used as the cooling fluid, which flows through a cooling circuit of the motor vehicle before it is applied to the lateral surface and thereby at least one of the exhaust gas components and which is arranged in the cooling circuit and thus through which the cooling liquid flows or can flow through component of the motor vehicle cools. Advantages and advantageous configurations of the first aspect of the invention are to be regarded as advantages and advantageous configurations of the second aspect of the invention and vice versa.

For example, the signal characterizes the beginning of an actual accident in the motor vehicle or an actual accident in the motor vehicle, so that, for example, the cooling liquid is applied to the exhaust gas component by means of the application device at or at least shortly after the start of the actual accident. It is also conceivable that the signal characterizes a probability with which an accident in the motor vehicle will occur in the near future.

For example, the probability is determined by means of the electronic computing device. In other words, it is conceivable that the signal characterizes an accident classified as unavoidable, in particular by the electronic computing device, which has not yet started, has not yet taken place or is not yet running, for example when the cooling fluid begins to be applied to the exhaust gas component , but will only occur in the near future with a high probability. It is thus conceivable that the cooling fluid is applied directly to the exhaust gas component by means of the application device before an accident or the accident begins or actually occurs. This enables a particularly high level of security to be achieved.

Further details of the invention emerge from the following description of a preferred embodiment and the accompanying drawing.

The single FIGURE shows a schematic top view of a motor vehicle according to the invention, designed as a motor vehicle, in particular a passenger vehicle.

The single figure shows a motor vehicle in a schematic plan view 1 , which is preferably designed as a motor vehicle, in particular as a passenger vehicle. The car 1 has an internal combustion engine 2 by means of which the motor vehicle, in particular pure, can be driven by an internal combustion engine. The internal combustion engine 2 has an engine block 3 on, which is designed for example as a crankcase. The engine block 3 forms or limits a cylinder 4th , in each of which a piston, not shown in the figure, is received in a translationally movable manner. The pistons are articulated via respective connecting rods with an output shaft designed, for example, as a crankshaft 5 the internal combustion engine 2 coupled so that the translational movements of the pistons in the cylinders 4th into a rotational movement of the output shaft 5 can be converted. The internal combustion engine 2 also has a cylinder head, which cannot be seen in the figure, which is separate from the engine block 3 trained and with the engine block 3 connected is. Per cylinder 4th the cylinder head has a combustion chamber roof. The respective cylinder 4th , the respective, in the respective cylinder 4th translationally movably received piston and the respective, the respective cylinder 4th assigned combustion chamber roof delimit a respective combustion chamber 6th the internal combustion engine 2 each partially. During fired operation of the internal combustion engine 2 run in the combustion chambers 6th Combustion processes, in the context of which respective fuel-air mixtures are ignited and burned. This results in exhaust gas from the internal combustion engine 2 .

The car 1 has an exhaust tract 7th on which of the exhaust gas from the combustion chambers 6th is permeable. This includes the exhaust tract 7th at least one of the exhaust gas from the combustion chambers 6th Through-flow exhaust gas component, which in the present case is an exhaust manifold also referred to as a manifold or exhaust manifold 8th is trained. By means of the exhaust manifold 8th for example, the exhaust gas from the cylinders 4th merged, for example the exhaust manifold 8th is at least substantially directly connected to the cylinder head. As a result, the exhaust manifold 8th very high temperature during fired operation.

From the figure it can be seen that the exhaust manifold 8th (Exhaust gas component) at least one exhaust gas duct, also simply referred to as a duct 9 has, which of the exhaust gas of the internal combustion engine 2 is permeable. The exhaust duct 9 is directly through a jacket surface on the inner circumference 10 of the exhaust manifold 8th limited. The exhaust manifold 8th also has a to the exhaust duct 9 and thus the lateral surface on the inner circumference 10 turned away from an environment 11 of the exhaust manifold 8th facing, outer circumferential lateral surface 12th on. The internal combustion engine 2 and the exhaust manifold 8th are in an engine room of the automobile 1 arranged.

Via the output shaft 5 can the internal combustion engine 2 Provide torques by means of which at least two vehicle wheels 13th of the motor vehicle 1 , in particular via an axle drive 14th , can be driven. This allows the motor vehicle 1 overall by means of the internal combustion engine 2 are driven. The car 1 also has a loading device 15th on, by means of which at least one accident of the motor vehicle 1 characterizing, electrical signal can be determined or is determined. By means of the loading device 15th is or becomes the exhaust manifold as a function of the determined signal 8th directly with a cooling fluid for cooling the exhaust manifold 8th acted upon or acted upon.

The car 1 also has a cooling circuit 16 and a cooling liquid, also referred to as cooling water, wherein the cooling circuit 16 can be flowed through by the cooling liquid. The cooling liquid comprises at least partially, in particular predominantly or exclusively, water. There are in the cooling circuit 16 one from the exhaust manifold 8th different, in addition to the exhaust manifold 8th intended component in the form of the internal combustion engine 2 , especially the engine block 3 , and one from the exhaust manifold 8th and from the internal combustion engine 2 different, additionally provided coolers 17th arranged so that the internal combustion engine 2 , especially the engine block 3 , and the cooler 17th can be flowed through by the cooling liquid. In particular while the motor vehicle is in motion 1 becomes the cooler 17th of the airflow and thus of the air forming the airflow, in particular on the outer circumference side. As a result, heat can be transferred from the cooler 17th flowing through coolant over the radiator 17th to the the cooler 17th air flowing through, whereby the cooling liquid is cooled.

To now have a particularly high level of safety for the motor vehicle 1 being able to realize is called that aforementioned cooling fluid uses the cooling liquid. This allows the exhaust manifold 8th be cooled particularly effectively and efficiently. Among the feature that the exhaust manifold 8th by means of the loading device 15th is or is acted upon directly by the cooling liquid, it is to be understood in particular that the cooling liquid, which by means of the application device 15th from the cooling circuit 16 is removed to thereby remove the exhaust gas component (exhaust manifold 8th ) to apply the coolant directly, the exhaust gas component 8th touched directly. The exhaust manifold points out 8th a high temperature, the coolant evaporates, so that a contact cooling of the exhaust manifold 8th is created.

In the embodiment shown in the figure, the loading device is 15th designed to cool the exhaust manifold on the inside or on the circumference 8th depending on the signal, the cooling liquid in the liquid state in at least one of the combustion chambers 6th and via the at least one combustion chamber 6th in the exhaust duct 9 to be introduced, so that the initially liquid cooling liquid the inner circumferential lateral surface 10 touch it directly and then cool it effectively and efficiently. This means that in the event of an accident, the at least one combustion chamber 6th by means of the loading device 15th is flooded with the cooling liquid, so that the cooling liquid is in the liquid state via the at least one combustion chamber 6th in the exhaust duct 9 arrives and thus the inner circumferential lateral surface 10 can touch it directly and subsequently cool.

To this end, the loading device 15th at least one loading element designed, for example, as an injector 18th on, by means of which the cooling liquid in the liquid state directly into the at least one combustion chamber 6th introduced, in particular sprayed or injected, is or can be. Here is the loading element 18th at least partially in the cylinder head or in the engine block 3 arranged or recorded.

The loading device 15th also includes an electronic computing device 19th , by means of which, for example, the signal is received and thus determined. The electronic computing device controls as a function of the signal 19th for example the loading element 18th on, whereby by means of the impingement element 18th the coolant from the cooling circuit 16 in the liquid state in the at least one combustion chamber 6th and through this into the exhaust duct 9 is introduced. Through the targeted cooling of the exhaust manifold as described 8th this can be cooled with regard to its temperature so that the temperature of the exhaust manifold caused by the cooling 8th less than a flash point of at least one medium of the motor vehicle that is different from the coolant and is additionally provided for this purpose 1 is. As a result, the medium cannot adhere to the exhaust manifold 8th ignite.

List of reference symbols

1

Motor vehicle

2

Internal combustion engine

3

Engine block

4th

cylinder

5

Output shaft

6th

Combustion chamber

7th

Exhaust tract

8th

Exhaust manifold

9

Exhaust duct

10

inner circumferential lateral surface

11

Surroundings

12th

outer circumferential lateral surface

13th

Vehicle wheel

14th

Axle drive

15th

Loading device

16

Cooling circuit

17th

cooler

18th

Loading element

19th

electronic computing device

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 102013011829 A1 [0002]
• DE 102014009849 A1 [0002]
• DE 102015212725 A1 [0002]

Claims (8)

Motor vehicle (1) with an internal combustion engine (2) by means of which the motor vehicle (2) can be driven, with at least one exhaust gas component (8) which has at least one exhaust gas duct (9) through which exhaust gas from the internal combustion engine (2) can flow, and with a Acting device (15), by means of which at least one signal characterizing an accident in the motor vehicle (1) can be determined and, depending on the signal, the exhaust gas component (8) can be acted upon directly with a cooling fluid for cooling the exhaust gas component (8), characterized in that the cooling fluid is designed as a cooling liquid flowing through a cooling circuit (16) of the motor vehicle (1), by means of which at least one component (2, 3) of the motor vehicle (1) different from the exhaust gas component (8) and located in the cooling circuit (16) is to be cooled . Motor vehicle (1) according to Claim 1 , characterized in that the internal combustion engine (2) has at least one combustion chamber (6), wherein the loading device (15) is designed to cool the inside of the exhaust gas component (8) as a function of the signal, the cooling liquid in the liquid state in the combustion chamber ( 6) and to be introduced into the exhaust gas duct (9) via the combustion chamber (6). Motor vehicle (1) according to Claim 1 or 2 , characterized in that the cooling liquid, in particular at least predominantly, comprises water. Motor vehicle (1) according to one of the preceding claims, characterized in that the component (2, 3) is the internal combustion engine (2). Motor vehicle (1) according to one of the preceding claims, characterized in that at least one cooler (17) through which the coolant can flow and which is different from the component (2, 3) and by means of which the coolant is to be cooled is arranged in the cooling circuit (16) . Motor vehicle (1) according to one of the preceding claims, characterized in that the loading device (15) has at least one loading element (18) which has at least one outflow opening through which the cooling liquid can flow and via which the cooling liquid can be applied directly to the exhaust gas component (8) , wherein at least a part of the exhaust gas component (8) is covered by the outflow opening. Motor vehicle (1) according to one of the preceding claims, characterized in that the exhaust gas component (8) is an exhaust manifold (8). Method for operating a motor vehicle (1) with an internal combustion engine (2), by means of which the motor vehicle (1) can be driven, with at least one exhaust gas component (8) which has at least one exhaust gas duct (9) through which exhaust gas from the internal combustion engine (2) can flow , and with an application device (15) by means of which at least one signal characterizing an accident in the motor vehicle (1) is determined and a cooling fluid is directly applied to the exhaust gas component (8) as a function of the signal, whereby the exhaust gas component (8) is cooled in a targeted manner is, characterized in that a cooling liquid is used as the cooling fluid, which flows through a cooling circuit (16) of the motor vehicle (1) before the exhaust gas component is applied and thereby at least one of the exhaust gas component (8) different and in the cooling circuit (16) arranged component (2, 3) of the motor vehicle (1) cools.

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