DE102017008336A1 - Internal combustion engine for a motor vehicle, in particular for a motor vehicle - Google Patents

Abstract

The invention relates to an internal combustion engine (10) for a motor vehicle, having at least one combustion chamber (14) which can be supplied with combustion air, with at least one first metering device (80), by means of which a fuel for operating the internal combustion engine (10) can be introduced into the combustion chamber (14) is, with at least one second metering device (20), by means of which a different of the fuel cooling medium for cooling the combustion air can be introduced into this, and with a exhaust gas from the combustion chamber (14) can be flowed through exhaust system (18), wherein: - at least one third metering device (24), by means of which a reducing agent for Entsticken the exhaust gas is introduced into this; and - at least one heat source (58) common to the reducing agent and the cooling medium, by means of which both at least part of the reducing agent and at least part of the cooling medium can be heated and the heat source (58) has at least one sheathed conduit (62) in which both at least one length region (64) of a first line (32) through which the reducing agent can flow and at least one longitudinal region (66) of a second line (40) through which the cooling medium can flow are accommodated.

Description

The invention relates to an internal combustion engine for a motor vehicle, in particular for a motor vehicle, according to the respective preamble of claim 1.

Such an internal combustion engine for a motor vehicle, in particular for a motor vehicle, for example, already from the WO 02/29235 A1 known. In this case, the internal combustion engine has at least one combustion chamber which can be supplied with combustion air and which is designed, for example, as a cylinder. Furthermore, the internal combustion engine has at least one first metering device, by means of which a particular liquid fuel for operating the internal combustion engine can be introduced into the combustion chamber. In particular, the fuel is used to perform a fired operation of the internal combustion engine. For this purpose, the fuel is burned, for example, with the combustion air in the combustion chamber.

In addition, at least one second metering device is provided, by means of which a different from the fuel and, for example, liquid cooling medium for cooling the combustion air into the combustion air can be introduced. Furthermore, the internal combustion engine has an exhaust system, which can be flowed through by exhaust gas from the combustion chamber. The fuel and the combustion air form, for example, in the combustion chamber, a fuel-air mixture, which is burned. This combustion of the fuel-air mixture results in said exhaust gas, which can flow out of the combustion chamber and into the exhaust system and can flow through the exhaust system.

Object of the present invention is to develop an internal combustion engine of the type mentioned in such a way that in a particularly advantageous manner, a particularly low-emission operation of the internal combustion engine can be realized.

This object is achieved by an internal combustion engine having the features of patent claim 1. Advantageous embodiments with expedient developments of the invention are specified in the remaining claims.

In order to develop an internal combustion engine specified in the preamble of claim 1 type such that a particularly low-emission operation of the internal combustion engine is realized in a particularly advantageous manner, a third metering device is provided by which a particular liquid reducing agent for Entsticken the exhaust gas in the exhaust gas can be introduced , By de-staking the exhaust gas is meant that with the aid of the reducing agent introduced into the exhaust gas, at least part of nitrogen oxides (NO _x ) possibly contained in the exhaust gas is removed from the exhaust gas. For this purpose, the exhaust gas and the reducing agent introduced into the exhaust gas flow through, for example, at least one SCR catalytic converter of the exhaust system, wherein the SCR catalytic converter is designed to support or effect a selective catalytic reduction (SCR - Selective Catalytic Reduction). In the context of selective catalytic reduction (SCR), nitrogen oxides contained in the exhaust gas react with the reducing agent, in particular with ammonia from the reducing agent, to form nitrogen and water, whereby the nitrogen oxide emissions can be kept to a particularly low level. As the reducing agent, for example, a urea solution, especially an aqueous urea solution, is used.

Furthermore, according to the invention, at least one heat source common to the reducing agent and the cooling medium is provided, by means of which both at least part of the reducing agent and at least part of the cooling medium can be heated. In other words, the heat source can be used to heat both the reducing agent and the cooling medium, so that a particularly advantageous availability of the cooling medium and the reducing agent, which are collectively referred to as fluids, can be realized. In this way, for example, both the cooling medium and the reducing agent can be used even at low temperatures in order to keep the fuel consumption and emissions, in particular the nitrogen oxide emissions, of the internal combustion engine particularly low. Since the fluid common to the fluids is used for heating the fluids, the number of parts, the weight, the space requirement and the costs of the internal combustion engine can furthermore be kept particularly low.

According to the invention, the heat source has at least one sheath line, in which both at least one longitudinal region of a first line through which the reducing agent can flow and at least one longitudinal region of a second line through which the coolant can flow are received or run.

In an embodiment of the invention, the heat source has an electric heater and / or a line through which the fuel can flow, in particular a return line, so that the fluids can be heated electrically and / or by means of the liquid, in particular liquid.

In order to further develop an internal combustion engine that a particularly low-emission operation of the internal combustion engine can be realized in a particularly advantageous manner, at least a third metering device is provided according to the invention, by means of which a reducing agent for Entsticken the exhaust gas can be introduced into this. In addition, according to the invention, at least one cooling line through which the cooling medium can flow is provided, via which at least part of the third metering device is to be cooled by means of the cooling medium flowing through the cooling line. The third metering device is cooled, for example, such that a heat transfer from the third metering device via the cooling line to the cooling medium, whereby the cooling medium is heated, for example. In this way, a particularly advantageous availability of both the cooling medium and the reducing agent can be ensured, so that a particularly fuel-efficient low-emission operation of the internal combustion engine can be realized.

The invention is based in particular on the idea of tempering the third metering device and, for example, to use already existing components or means and / or synergies between the third metering device and already existing components or means, so that the third metering device can be tempered particularly advantageously. The second metering device is a system for fluid injection because the cooling medium is a fluid. The cooling medium is, for example, water or has at least water, wherein by means of the metering device, the cooling medium, for example, directly into the combustion chamber and / or arranged at a location upstream of the combustion chamber in the combustion air, in particular injected, can be. For example, the second metering device is combined with the third metering device in order to temper the second and third metering devices advantageously, in particular to heat them. Furthermore, it is possible, for example, to provide a control unit common to the second metering device or the third metering device in order to control the second metering device and the third metering device by means of the same control device and thus to be able to control or control them. In this control unit, for example, one of the third metering device and the second metering device common software structure is provided, since, for example, both by the introduction of the reducing agent in the exhaust gas and by introducing the cooling medium into the combustion air, the emissions of the internal combustion engine can be favorably influenced. In particular, it is also possible to take over ready-developed SCR components with only minor changes, in particular if water is used as the cooling medium or if the cooling medium has at least water. By a clever combination of the third metering device with the second metering device synergies between the second metering device and the third metering device can be used to temper the second metering device and the third metering advantageously advantageous, that is cool and / or can heat.

Furthermore, it is conceivable that the heat source has, for example, at least one coolant line through which a coolant can flow, so that, for example, the reducing agent and the cooling medium can be heated via the coolant line by means of the coolant, that a heat transfer from the coolant via the coolant line to the reducing agent and the cooling medium takes place. The coolant is for example a liquid and is used to cool the internal combustion engine. For this purpose, for example, the coolant flows through at least one, for example, the combustion chamber forming or limiting housing part, so that a heat transfer from the housing part to the coolant takes place. As a result, the coolant is heated, so that then by means of the heated coolant, the reducing agent and the cooling medium can be heated.

The line formed by the fuel, for example, as a return line, is in particular a part of a return line, via which excess fuel is discharged from the internal combustion engine or from the first metering device and, for example, fed back to a tank for storing the fuel. The fuel is preferably a liquid fuel such as gasoline or preferably diesel.

Alternatively or additionally, it is conceivable that the heat source common to the second metering device and the third metering device has at least one retarder fluid line through which a retarder fluid, in particular a retarder fluid, can flow. The retarder fluid is used to operate a retarder for braking the motor vehicle. By this deceleration of the vehicle, the retarder fluid is heated, for example. As a result, heat transfer from the retarder fluid to the reducing agent and to the cooling medium via the retarder fluid line may occur, thereby heating the fluids.

The heat source is thus one of the second metering device and the third metering device different energy source, which is used to the fluids (reducing agent and cooling medium) to its advantageous operating temperature bring or maintain at this operating temperature. Preferably, at least one component which is present in any case is used as the heat source in order to be able to keep the space requirement, the costs, the number of parts and the weight of the internal combustion engine particularly low.

The second metering device comprises, for example, a metering module, which is arranged close to the engine. In this case, for example, in particular depending on the material properties, the cooling medium can be used to cool the dosing module close to the engine. As a result, excessive temperatures of the metering can be avoided, so that the metering module can be used particularly advantageous. Furthermore, it is conceivable that the second metering device has at least one injector for introducing the cooling medium into the combustion air. In this case, for example, the third metering device has at least one second injector for introducing the reducing agent into the exhaust gas. Preferably, the injectors are configured identical, in particular with the difference that the second injector has a heat sink, while the first injector does not have the heat sink. Furthermore, it is conceivable, for example, that in particular when the cooling medium is water or water, to use the same tank technology and / or line technology for the second metering device and for the third metering device, whereby the number of different components and thus the cost of the internal combustion engine can be kept very low.

Finally, it has proven to be advantageous that at least one cooling medium tank is provided for receiving and storing the cooling medium, wherein it is preferably provided to supply a windshield cleaning system of the motor vehicle with the cooling medium from the cooling medium tank. This means that the cooling medium tank is used both for supplying the second metering device and for supplying the window cleaning system with the cooling medium, so that the number of parts and thus the space requirement and the cost of the internal combustion engine can be kept particularly low. By means of the windscreen cleaning system, for example, the cooling medium can be sprayed onto at least one pane, in particular on a windshield and / or a rear window, of the motor vehicle, in order thereby to clean the pane.

The invention is also based on the finding that emissions are increasingly regarded as a disadvantage of internal combustion engines, be it in certification or in other respects. A variety of techniques for emission reduction in internal combustion engines is known. One way to reduce emissions is, for example, to use an inert fluid during a combustion taking place in the combustion chamber to lower peak temperatures in the combustion chamber and thus to limit, for example, thermal nitrogen oxides according to Zeldovich. For this purpose, the exhaust gas recirculation with exhaust gas cooler is a common example, so that for example recirculated exhaust gas is used as the aforementioned inert fluid. Another possibility is to use the previously described cooling medium, which comprises, for example, at least water, as the said inert fluid. By introducing, in particular direct injection, the cooling medium, in particular water, in the combustion chamber, a particularly high specific power of the internal combustion engine can be realized, at the same time the formation of nitrogen oxides can be kept particularly low.

• - Rechenleistung des Steuergeräts
• - Ein-/Ausgänge in einer Kontrolleinheit, insbesondere des Steuergeräts
• - Softwareumfänge
• - Fluidvorratsbehälter, mit Füllstandsüberwachung, wenn nötig mit Fördereinheit und/oder Qualitätssensor
• - Fluidleitung
• - Fluiddoser
• - Sensorik zur Dosierungsregelung, insbesondere als Closed-Loop-Regelung

One aspect is, for example, to use an existing SCR system for exhaust aftertreatment as a basis to additionally realize a particularly advantageous introduction or metering of the cooling medium. In this case, the SCR system comprises, for example, a tank unit for receiving and storing the reducing agent, at least one heatable media line through which the reducing agent can flow, at least one tempered metering module, which is for example the third injector and / or the aforementioned control device as electronic SCR system. Control and / or regulating unit. In the context of the invention, for example, the SCR system is extended by the following amounts:

• - Computing power of the controller
• - Inputs / outputs in a control unit, in particular of the control unit
• - Software scopes
• - Fluid reservoir, with level monitoring, if necessary with delivery unit and / or quality sensor
• - Fluid line
• - Fluid doser
• - Sensors for dosing control, especially as a closed-loop control

The integrated into an engine control unit or external control and / or control unit for the cooling medium can be used for example for exhaust aftertreatment and a metering of the cooling medium or vice versa. If, for example, water is used as the cooling medium, a combination of fluid lines can also be used to simplify the overall system. An electric heater and a wiring with attachment points in the vehicle can then be shared, for example become. For this purpose, the lines of the SCR system and the second metering device can be performed in parallel with an electric heater and heated together by a common insulation shell such as the aforementioned sheathed cable and fastened in the motor vehicle.

In particular, it is conceivable that the first line and the second line are arranged coaxially with each other, so that, for example, the first line extends at least partially within the second line or vice versa. This is a further possibility for arranging the lines for a common installation and fastening. It is advantageous here, for example, if the first line, in particular with electrical heating, runs in the second line, so that the second line surrounds at least a part of the first line, so that then, for example, the cooling medium can be used as cooling fluid, so that also preferably at a higher temperature for emission reduction is effective and should be in use.

In such a coaxial arrangement, for example, the central position of the inner conduit, which is formed for example as a tube, be stabilized by connections to the outer, acting as a sheath line. Advantageously, this stabilizers are used, which are simultaneously designed as a heating element for heating at least one of the lines, in particular for heating both lines. In another version, the stabilizers are additionally designed as flow elements in order to favorably influence the flow of the outer medium. This can also be carried out actively, so that when desired strong heat transfer in the outer medium increasingly turbulent flow conditions are set.

At temperatures that could cause freezing of the reducing agent, the electric heater is switched on. As a result, for example, first the first line is heated and then additionally the cooling medium. The cooling medium thus also serves as a temperature protection to the outside. If the cooling medium has higher requirements for the operating temperature than the reducing agent, then the arrangement can also be chosen so that the second line inside and the first line is arranged outside and / or that the heater is mounted on the inner line and so on more the external medium works.

Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments and from the drawing. The features and feature combinations mentioned above in the description as well as the features and feature combinations mentioned below in the description of the figures and / or in the figures alone can be used not only in the respectively specified combination but also in other combinations or in isolation, without the scope of To leave invention.

• 1 eine schematische Darstellung einer erfindungsgemäßen Verbrennungskraftmaschine;
• 2 eine schematische Querschnittsansicht zweier Leitungen der Verbrennungskraftmaschine gemäß einer ersten Ausführungsform;
• 3 eine schematische Querschnittsansicht der Leitungen gemäß einer zweiten Ausführungsform;
• 4 eine schematische Darstellung einer Verbrennungskraftmaschine; und
• 5 eine schematische Darstellung einer Verbrennungskraftmaschine.

The drawing shows in:

• 1 a schematic representation of an internal combustion engine according to the invention;
• 2 a schematic cross-sectional view of two lines of the internal combustion engine according to a first embodiment;
• 3 a schematic cross-sectional view of the lines according to a second embodiment;
• 4 a schematic representation of an internal combustion engine; and
• 5 a schematic representation of an internal combustion engine.

In the figures, the same or functionally identical elements are provided with the same reference numerals.

1 shows a schematic representation of an internal combustion engine 10 for a motor vehicle, in particular for a motor vehicle such as a passenger car. The internal combustion engine 10 has a housing part designed, for example, as a cylinder housing, in particular as a cylinder crankcase 12 on, through which several combustion chambers present in the form of cylinders 14 are limited. In this case, the internal combustion engine has at least one first metering device, not shown in the figures, by means of which a particularly liquid fuel for operating the internal combustion engine 10 in the respective cylinder 14 can be introduced. In particular, the fuel, for example, directly into the respective cylinder 14 be injected. For this purpose, for example, includes the first metering device per cylinder 14 exactly one fuel injector, by means of which the fuel for performing a fired operation of the internal combustion engine 10 directly into the respective cylinder 14 can be injected.

The respective cylinder 14 is also supplied with air in the form of combustion air, so that in the respective cylinder 14 a combustion air and the fuel comprehensive fuel-air mixture is formed. The fuel-air mixture is burned, resulting in exhaust gas of the internal combustion engine 10 results. It is in 1 particularly schematically an air flow through the combustion air intake 16 the internal combustion engine 10 shown, wherein the combustion air by means of the intake 16 to that and in particular in the cylinder 14 to be led. In addition, the internal combustion engine 10 one of the exhaust from the cylinders 14 flow-through exhaust system 18 on, by means of which the exhaust, for example, from the cylinders 14 is dissipated. In particular, in the exhaust system 18 at least one SCR catalyst (SCR - Selective Catalytic Reduction), which is not recognizable in the figures, by means of which a selective catalytic reduction for removing the exhaust gas can be effected or supported.

Furthermore, the internal combustion engine 10 at least one second metering device 20 on, by means of which a different from the fuel and in particular liquid cooling medium for cooling the combustion air into the combustion air can be introduced. For this purpose, the metering device comprises 20 for example, at least one metering unit, also referred to as an injector 22 , by means of which, for example, the at least water-containing or formed as water cooling medium introduced into the combustion air, in particular injected, can be. At the in 1 illustrated embodiment is the metering device 20 , in particular the dosing unit 22 , adapted to the cooling medium at an upstream of the cylinder 14 arranged location in the intake 16 and thus introduce into the combustion air, in particular to inject. Alternatively or additionally, it is conceivable that the metering device 20 , in particular the dosing unit 22 , is adapted to the particular liquid cooling medium directly into the respective cylinder 14 and thus in the respective cylinder 14 to introduce absorbed combustion air, in particular to inject. For this purpose, for example, the metering device 20 at least one first injector, which is also referred to as Kühlmediumsinjektor.

To now a particularly low-emission operation of the internal combustion engine 10 To be able to realize includes the internal combustion engine 10 at least a third metering device 24 , by means of which a particular liquid reducing agent for Entsticken the exhaust gas is introduced into the exhaust gas. For this purpose, the metering device comprises 24 for example, at least one metering unit, also referred to as an injector 26 , by means of which the reducing agent in the exhaust system 18 and thus in the exhaust gas introduced, in particular injectable, is. For this purpose the dosing unit comprises 26 For example, at least one second injector, which is also referred to as Reduktionsmittelinjektor. By means of the dosing unit 26 For example, the reducing agent may be at a downstream of the cylinder 14 arranged location in the exhaust system 18 and thus be introduced into the exhaust gas, wherein the reducing agent is preferably introduced into the exhaust gas upstream of the SCR catalyst.

The metering device 20 has a tank also referred to as cooling medium tank or water tank 28 for receiving and storing the cooling medium, wherein the tank 28 Also referred to as tank unit. Furthermore, the metering device 20 for example, the tank 28 assigned and in particular designed as an electric heater heating 30 on, by means of which in the tank 28 recorded cooling medium can be heated or heated. By means of at least one flow-through of the cooling medium and also referred to as a supply line line 32 can the cooling medium from or out of the tank 28 to the dosing unit 22 be directed. This is in the line 32 an example electric pump 34 arranged, by means of which the cooling medium from the tank 28 to the dosing unit 22 and doing so through the line 32 can be promoted.

The metering device 24 has a tank also referred to as a reducing agent tank or tank unit 36 for receiving and storing the reducing agent. The tank 36 is a particular electric heater 3.8 of the metering device 24 assigned, so that in the tank 36 absorbed reducing agent by means of heating 38 can be heated or heated. By means of a designated as a supply line line 40 the metering device 24 The reducing agent can be from or from the tank 36 to the metering device 26 be guided. This is in the line 40 an example electric pump 42 the metering device 24 arranged so that by means of the pump 42 the reducing agent from the tank 36 to the dosing unit 26 can be promoted. Further, for example, an electronic computing device in the form of a control device 44 provided, which is for example a vehicle control unit. In addition, for example, another electronic computing device in the form of a control device 46 provided, which is designed for example as a motor control unit. Furthermore, one is the metering devices 20 and 24 common control and / or regulating unit 48 provided, which has, for example, at least one microprocessor. By means of the metering devices 20 and 24 common control and / or regulating unit 48 can the dosing 20 and 24 , especially the pumps 34 and 42 and / or the metering units 22 and 26 operated, in particular controlled or regulated. This is for example the common control and / or regulating unit 48 over a wiring harness 50 with a plurality of sensors 52a-e connected, which provide respective, in particular electrical, signals.

As a result, the metering devices 20 and 24 operated by the common control and / or regulating unit in response to the signals, in particular controlled or regulated. The respective sensor 52a For example, is a level sensor for detecting a level of the cooling medium or the reducing agent in the tank 28 respectively 36 , The respective sensor 52b is formed, for example, as a temperature sensor for detecting a respective temperature of the cooling medium or the reducing agent. The respective sensor 52c is designed, for example, as a quality sensor for detecting a quality of the cooling medium or of the reducing agent. The respective sensor 52d is for example as a pump sensor for monitoring or checking the respective pump 34 respectively 42 formed, for example, the respective sensor 52e is formed as a pressure sensor for detecting a pressure of the cooling medium or the reducing agent.

Furthermore, the respective metering device comprises 20 respectively 24 a filter 54 respectively 56 , via which the cooling medium or the reducing agent from the tank 28 respectively 36 into the respective line 32 respectively 40 can be performed.

In order to realize a particularly low-emission operation in a particularly simple and, in particular, cost-effective manner, at least one common heat source is the reducing agent and the cooling medium 58 provided, by means of which both at least a portion of the reducing agent and at least a portion of the cooling medium can be heated. At the in 1 illustrated embodiment includes the heat source 58 for example, an electric heater 60 , by means of which both the cooling medium and the reducing agent can be heated. Furthermore, the heat source comprises at least one sheathed cable 62 in which both at least a length range 64 the line 32 as well as at least a length range 66 the line 40 are included. As a result, for example, a particularly efficient and effective heating of the length ranges 64 and 66 and thus the cooling medium and the reducing agent can be realized.

2 illustrates a first embodiment of the internal combustion engine 10 , In the first embodiment, the length ranges run 64 and 66 next to each other in the sheath line 62 , which in particular as a thermal insulation of the lines 32 and 40 acts. Furthermore, it is possible over the sheathed cable 62 the wires 32 and 40 to fix by means of at least one common fastening means and to lay accordingly.

3 shows a second embodiment in which the lines 32 and 40 or at least the length ranges 64 and 66 coaxial with each other. At least the length range is 64 within the length range 66 arranged or runs in the length range 66 so the length range 66 or the line 40 the length range 64 or the line 32 Surrounds the outer peripheral side. In addition, so-called stabilizers 68 provided which, for example, in the radial direction of the line 32 between this and the line 44 are arranged and, for example, the lines 32 and 40 Keep at a distance from each other. Here is, for example, the line 40 with the heater 60 Mistake.

As an alternative to the second embodiment, it is conceivable that the line 40 or the length range 66 in the pipe 32 or in the length range 64 runs, so then, for example, the heating 60 is arranged inside. At the in 3 illustrated second embodiment flows around the reducing agent, the conduit 32 outer circumference. Is the line 40 on the line 32 arranged, then flows around, for example, the cooling medium, the line 40 outer circumference.

4 shows an internal combustion engine 10 , Furthermore, in 4 an example designed as a windshield of the vehicle disc 70 recognizable, which by means of a windscreen cleaning system 72 sprayed with a cleaning fluid and thus can be supplied. Here is the windscreen cleaning system 72 with the cooling medium, in particular from the tank 28 and thereby, for example, over the line 32 , supplying the cooling medium both for cooling the combustion air and for cleaning the disc 70 is used. This means that the water tank is advantageously used for cleaning the windows. For example, the coolant from the tank 28 promoted and, for example, at least a first part of the dosing unit 22 for emission reduction and / or at least a second part of the windscreen cleaning system 72 and thus led to the windscreen cleaning. In this case, for example, a tank which is also referred to as wash concentrate tank 74 provided for receiving and storing a washing concentrate. For example, the cooling medium used to clean the disc 70 is used, with washing concentrate from the tank 74 be offset, thereby providing efficient and effective cleaning of the disc 70 to be able to realize. For the washing concentrate from the tank 74 it is, for example, a cleaning agent and / or anti-freeze, which with the cooling medium from the tank 28 mixed and under high pressure, for example, preferably from three to nine bar finely atomized on the disc 70 is sprayed. This includes the windscreen cleaning system 72 for example, a line 76 , by means of which the cooling medium from the tank 28 , especially from the line 76 , to the disc 70 to be led. If the line 76 For cleaning the windscreen also heated, can in this case even on the antifreeze or the tank 74 be waived. Another advantage is that the space and the weight of the tank 74 for the tank 28 can be used so that disadvantages in packaging, weight and space can be avoided. Depending on the system design, the metering of the reducing agent or of the cooling medium can be carried out by means of a central injector by means of a plurality of injectors, in particular up to one injector per cylinder.

The injector for introducing the cooling medium is installed, for example, in a thermally less demanding environment, so that the injector for introducing the fluid medium without cooling or heat sink can be provided.

Finally shows 5 an internal combustion engine 10 in which, for example, the heat source 58 alternatively or additionally, a line through which the fuel can flow in the form of a return line 78 which, for example, in the sheathed cable 62 runs. In 5 is the first metering recognizable and with 80 designated. The metering device 80 includes a flow with a flow line 82 , which can be flowed through by the fuel. By means of the supply line 82 the fuel from a fuel tank is added to the in 5 With 84 directed fuel injectors passed. By means of the return line 78 will excess fuel, which is not using the injectors 84 in the cylinder 14 injected from the injectors 84 led back to the fuel tank. By means of the return line 78 and in particular by means of the return line 78 By flowing fuel, for example, the reducing agent and the cooling medium so tempered, in particular to be heated, that a heat transfer from which the return line 87 flowing fuel through the return line 78 on the lines 32 and 40 takes place on the cooling medium and on the reducing agent.

LIST OF REFERENCE NUMBERS

10

Internal combustion engine

12

housing part

14

cylinder

16

intake system

18

exhaust system

20

metering

22

dosing

24

metering

26

dosing

28

tank

30

heater

32

management

34

pump

36

tank

38

heater

40

management

42

pump

44

control unit

46

control unit

48

Control and / or regulating unit

50

harness

52a-e

sensor

54

filter

56

filter

58

heat source

60

heater

62

sheathed cable

64

length range

66

length range

68

stabilizer

70

disc

72

Windshield washing system

74

tank

76

management

78

Return line

80

metering

82

supply line

84

injectors

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been 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.

Cited patent literature

• WO0229235 A1 [0002]

Claims (2)

Internal combustion engine (10) for a motor vehicle, comprising at least one combustion chamber (14) which can be supplied with combustion air, with at least one first metering device (80), by means of which a fuel for operating the internal combustion engine (10) can be introduced into the combustion chamber (14), with at least a second metering device (20), by means of which a different of the fuel cooling medium for cooling the combustion air can be introduced into this, and with a exhaust gas from the combustion chamber (14) can be flowed through exhaust system (18), characterized by : - at least a third metering device ( 24), by means of which a reducing agent for Entsticken the exhaust gas can be introduced into this; and - at least one heat source (58) common to the reducing agent and the cooling medium, by means of which both at least part of the reducing agent and at least part of the cooling medium can be heated, and - the heat source (58) has at least one sheathed conduit (62) in which both at least one length region (64) of a first line (32) through which the reducing agent can flow and at least one longitudinal region (66) of a second line (40) through which the cooling medium can flow are accommodated. Internal combustion engine (10) after Claim 1 , characterized in that the heat source (58) comprises an electric heater (60) and / or a line through which the fuel can flow, in particular a return line (78).

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