DE102012016673A1 - Hybrid drive device for motor car, has burner including air/fuel mixture chamber that leads to fuel supply spacer and air supply pipe, where set of opening locations of spacer and pipe into chamber are arranged in cylinder head of engine - Google Patents

Abstract

The device (1) has a combustion engine (2) and an exhaust system (8) including a catalyst converter (12) for cleaning exhaust gas from the engine. The system is attached to the engine and with a heating device (16) for heating catalyst. The heating device comprises a burner (17) with an air/fuel mixture chamber (18) that leads to a fuel supply spacer (20) and an air supply pipe (21). A set of opening locations (22, 23) of the spacer and the pipe into the chamber is arranged in a cylinder head (9) of the engine.

Description

The invention relates to a drive device with an internal combustion engine, with an exhaust system connected to the internal combustion engine having a catalyst for purifying exhaust gas of the internal combustion engine, and with a heating device for heating the catalyst, wherein the heater has a burner with a mixture forming chamber into which a Open the fuel supply line and an air supply line.

A drive device of the type mentioned above is used for example for driving a motor vehicle. The drive device may be part of a hybrid drive device which, in addition to the drive device, has at least one further drive device which, for example, has an electrical machine, in particular only the electric machine. It may be provided that the drive device and the further drive device generate a torque directed to the driving of the motor vehicle at least temporarily together. For this purpose, the drive device and the further drive device are operatively connected to one another, for example by means of a gear. In addition to the internal combustion engine, the drive device has the exhaust system and the heating device. The exhaust system serves to divert the exhaust gas generated by the internal combustion engine in the direction of an external environment of the drive device. In order to meet applicable emission regulations, it is necessary to at least partially clean the exhaust gas before it enters the outside environment. For this purpose, the exhaust system to the catalyst. The exhaust gas of the internal combustion engine is passed through the catalyst during the passage through the exhaust system, in which a catalytically favorable reaction, in particular a reduction, takes place. After passing through the catalyst, the exhaust gas from the exhaust system can be supplied to the outside environment.

The catalyst must usually have at least a certain operating temperature, so that the reaction proceeds and the purification of the exhaust gas can be carried out. The heating of the catalyst is usually carried out by the exhaust gas flowing through it, which has a high temperature after the internal combustion engine. However, in particular in the case of low external environments and / or a cold start of the drive device, the time span which elapses until the operating temperature is reached by the catalytic converter can be comparatively long. In this period of time, the reaction can not proceed or only with low efficiency, so that the purification of the exhaust gas is not reliable or not complete. This problem is particularly pronounced in the hybrid drive device, because here the internal combustion engine is not constantly in operation. This meant that during periods in which only the further drive means is operated for providing a torque, while the drive means and thus the internal combustion engine is deactivated, the catalyst is not heated by the exhaust gas. Accordingly, its temperature decreases. If it falls below the operating temperature, the resulting exhaust gas can not be reliably cleaned when the drive device or the internal combustion engine is activated again. Accordingly, the heater is also operated during such sections to maintain the catalyst at or above its operating temperature.

For this reason, in particular in the case of internal combustion engines designed as diesel internal combustion engines, the heating device is provided, by means of which the catalyst can be heated directly or at least indirectly. In the former case, it may be provided to heat the catalyst directly, for example by means of a heating coil, wherein the heating coil is arranged in particular on the catalyst or a catalytically active element of the catalyst. In the latter case, in particular, the exhaust gas of the internal combustion engine is heated again upstream of the catalyst, and therefore brought to a higher temperature. The exhaust gas heated in this way subsequently flows through the catalyst and heats it more strongly than would be possible with unheated exhaust gas. For example, the burner is used for such indirect heating of the catalyst. This is preferably operated with liquid and / or gaseous fuel, which is supplied through the fuel supply line of the mixture forming chamber. In addition, the air supply line opens into the mixture formation chamber. Accordingly, the mixture-forming chamber may be supplied with both air and fuel and subsequently combusted to heat the catalyst. In this way, the catalyst can be brought very quickly to the desired operating temperature, so that a purification of the exhaust gas with high efficiency is feasible.

The advantage of such a heater is the very high energy density, a variable mounting position and a simple design. On the other hand, the fuel for the heater or the burner must be transported to the hot exhaust system or through them. Accordingly, the fuel in the fuel supply line heats up before being introduced into the mixture forming chamber. This can sometimes lead to vapor bubble formation, which can cause a malfunction of the heater. For the same reason or due Fuel aging can also cause misfire of the burner. Furthermore, a fuse of the heater against pollution and external force is difficult, especially if it is installed in an underbody of the motor vehicle, because there is already a fuel-carrying lines for supplying the engine with fuel and also the ground clearance, ie the distance of the subfloor of a background of the motor vehicle is limited. It is also disadvantageous to arrange the burner in the area of the underbody of the motor vehicle, because the subsurface located under the motor vehicle can be negatively influenced by the high temperatures generated by the burner.

It is therefore an object of the invention to provide a drive device which does not have the disadvantages mentioned in the introduction, but in particular always enables reliable operation and avoids a negative influence on the external environment of the motor vehicle, in particular its background, even with long periods of inactivity of the motor vehicle.

This is achieved according to the invention with a drive device having the features of claim 1. It is provided that at least one of the discharge points of the fuel supply line and the air supply line is arranged in the mixture forming chamber in a cylinder head of the internal combustion engine. It is therefore first primary objective of the drive device according to the invention, at least one of the supply lines to be arranged such that they or the guided in her fluid is not excessively charged with heat. For this reason, at least a portion of the mixture formation chamber, particularly the entire mixture formation chamber, is arranged in the cylinder head such that at least one of the supply lines connected to the mixture formation chamber does not heat up to cause the above-mentioned problems. Due to the arrangement of the mixture forming chamber, the at least one of the mouth points of the fuel supply line and the air supply line can also be correspondingly present in the cylinder head, that is, enclosed by this. Consequently, at least the section of the respective line extending in the region of the mixture-forming chamber is preferably also arranged in the cylinder head and accordingly protected against temperature. This is especially true when the cylinder head is cooled, so has a cooling device that limits its temperature to a certain maximum temperature upwards. It is of course particularly preferred if at least the fuel supply line or its discharge point is arranged in the cylinder head. Alternatively or additionally, however, this can also be provided for the air supply line or its discharge point.

In an advantageous embodiment of the invention, it is provided that in the flow direction of the mixture forming chamber, a combustion chamber adjoins, which is arranged outside of the cylinder head. The burner is composed at least of the mixture formation chamber and the combustion chamber, which are arranged one behind the other in the flow direction of the fuel or the fuel-air mixture. While the mixture formation chamber is preferably arranged at least partially in the cylinder head so that the at least one point of discharge can also be arranged therein, the combustion chamber should be completely outside the cylinder head. In the mixture formation chamber, above all, the mixing of the fuel introduced through the fuel supply line with the air introduced through the air supply line takes place. The resulting fuel-air mixture flows from the mixture formation chamber into the combustion chamber and is preferably ignited only there or only ignites there. The actual combustion is therefore preferably provided exclusively in the combustion chamber or in these adjoining areas. Due to the arrangement of the combustion chamber outside of the cylinder head this is now not acted upon by the heat generated during combustion. Accordingly, by means of the cylinder head or its cooling device, the reliable cooling of the mixture formation chamber or the at least one discharge point can be ensured.

In one embodiment of the invention, provision may be made for a flame holder to be arranged fluidically between the mixture-forming space and the combustion chamber. The flame holder ensures the positioning and stabilization of combustion. In particular, the flame holder is designed such that a skip of the flame from the combustion chamber is prevented in the mixture formation chamber. The flame holder is thus present for example as a grid structure or the like, which separates the mixture-forming space and the combustion chamber in the flow direction from each other.

A development of the invention provides that in the cylinder head a fuel supply line and / or an air supply line for supplying a cylinder of the internal combustion engine with fuel or air is provided, wherein the fuel supply line is connected to the fuel supply line and / or the air supply line to the air supply line. Thus, the fuel supply line leads to an introduction device for the fuel in the at least one cylinder, preferably to the introduction devices of all cylinders of the internal combustion engine. The same applies to the air supply line. The introduction device usually has at least one introduction valve or the like, with which the respective fluid, ie either the fuel or the air, can be introduced into the cylinder in a targeted manner. It is now provided that the burner of the heater is operated with the same fuel as the internal combustion engine. In such an embodiment, the fuel supply of the internal combustion engine can be used to supply the burner.

Therefore, in at least one embodiment of the drive device, the fuel supply line leading to the burner is connected to the fuel supply line of the internal combustion engine. Additionally or alternatively, this may also be provided for the air supply line, which is therefore shot on the one hand to the mixture formation chamber and on the other hand to the air supply line. The cylinder head therefore particularly preferably has only one fuel connection and / or only one air connection. From the first, the fuel supply line extends to the at least one cylinder, preferably to all cylinders, wherein fluidically opens the fuel supply line between the fuel port and the at least one cylinder in the fuel supply line. Accordingly, the air supply line starts from the air connection, which leads up to the at least one cylinder. Here too, in an analogous manner, flow-wise, between the air connection and the at least one cylinder, an opening of the air supply line into the air supply line is provided.

In an advantageous embodiment of the invention it is provided that the fuel supply line is assigned a fuel delivery device, in particular a high-pressure fuel delivery device, wherein the fuel supply line is connected upstream of the fuel delivery device to the fuel supply line. The fuel delivery device serves to convey the fuel in the direction of the at least one cylinder. The fuel delivery device is designed, for example, as a high-pressure fuel delivery device. This means that, upstream of it, there is a low-pressure fuel delivery device, with which initially a pre-delivery of the fuel is carried out. With the help of the low-pressure fuel conveyor, the fuel is supplied to the cylinder head and thus the fuel supply line. In the fuel supply line is now the high-pressure fuel conveyor, which brings the fuel to a higher pressure than was previously done with the help of the low-pressure fuel conveyor. However, because the burner is usually operated at a relatively low fuel pressure, it is intended to be connected to or open into the fuel supply line upstream of the fuel delivery device. The fuel supply line is thus fluidly connected between the low pressure fuel conveyor and the high pressure fuel conveyor to the fuel supply line.

However, it may be provided that the fuel supply line is associated with a further fuel delivery device, which additionally serves to convey the fuel in the direction of the mixture formation chamber. Overall, therefore, for example, three fuel conveyors may be provided, namely the low-pressure fuel conveyor and the high-pressure fuel conveyor and the further fuel conveyor, the two latter are fluidically connected in parallel to each other to the low-pressure fuel conveyor. Accordingly, both the at least one cylinder and the burner can be charged with fuel at the respectively desired fuel pressure.

In a further embodiment of the invention can be provided that the fuel supply line is assigned a switching valve for adjusting the introduced into the mixture formation space fuel mass flow. The switching valve is preferably located directly on the mixture formation space or at least partially extends into it. In the last embodiment, the switching valve is for example part of an injection device with which the fuel can be injected into the mixture formation space and thus swirled. By this turbulence mixing of the fuel with the air, so the formation of the fuel-air mixture is significantly improved. The switching valve can now be designed, for example, as a solenoid valve. It may be provided for pure switching or alternatively for stepless adjustment of the fuel mass flow.

A development of the invention provides that the cylinder head has a cooling device with at least one cooling element, wherein the cooling element is arranged adjacent to the mixture formation space. The cooling element is, for example, a coolant line or a coolant space. The cooling element thus absorbs coolant, which is conveyed through the cooling element for dissipating the heat from the cylinder head. The cooling element is now arranged such that heat can be selectively removed from the mixture forming space, so that the burner is at least partially cooled. The cooling element is connected to a coolant supply of the cylinder head, which preferably also serves to supply coolant to at least one further cooling element, which is associated with the at least one cylinder. For example, the cooling element is part of a water jacket, which is assigned to the cylinder head. It is particularly advantageous if the cooling element at least partially surrounds the mixture-forming space, for example completely enclosing it in at least one dimension. For example, the mixture formation chamber is cylindrical or cuboid. The cooling element can now encompass the lateral surface of the mixture-forming chamber in the peripheral direction-for example, based on a main flow direction of the fuel-air mixture-at least regionally, in particular completely. In this way, a particularly efficient cooling of the burner or the at least one discharge point is achieved.

Additionally or alternatively, it can be provided that the cylinder head, in particular the at least one cylinder, is flow-connected to an exhaust pipe of the exhaust system via an exhaust manifold and the exhaust manifold has a flame channel which is connected to the mixture formation chamber and forms at least a portion of the combustion chamber. The cylinder head thus has the manifold or exhaust manifold. The exhaust manifold usually serves to combine the exhaust gas discharged from a plurality of cylinders of the internal combustion engine and the collected introduction of the exhaust gas into the exhaust pipe. The exhaust manifold thus has a plurality of exhaust passages, which are connected to the cylinders of the internal combustion engine, in particular to these respective associated exhaust valves. The exhaust ducts open downstream (relative to a main flow direction of the exhaust gas) together into the exhaust pipe of the exhaust system. As a result, for example, they are subsequently fed to the catalyst.

The exhaust manifold now additionally has the flame channel, which is fluidically connected to the mixture formation chamber. It forms, for example, at least one area of the combustion chamber. Particularly preferably, the flame channel is fluidically separated from the exhaust ducts of the exhaust manifold, so it is parallel to these. Only via a downstream of the exhaust manifold located region of the exhaust pipe may be present a flow connection between the exhaust ducts and the flame channel. However, this flow connection is only indirect. Due to the at least regional arrangement of the combustion chamber in the exhaust manifold, the combustion of the fuel introduced into the burner takes place mainly in the exhaust manifold. This is due to the direct application of the hot exhaust gas of the engine anyway from a highly heat-resistant or heat-resistant material. Accordingly, further cooling measures downstream of the mixture formation space can be avoided in this way.

In a preferred embodiment of the invention it is provided that the combustion chamber and / or the flame channel are at least partially disposed in a housing of a supercharger, in particular an exhaust gas turbocharger. The combustion chamber, the flame channel or both should therefore pass through the housing of the supercharger or at least partially present in it. It may be provided analogous to the above statements with respect to the exhaust manifold, that the combustion of the introduced into the burner fuel takes place mainly in the housing of the supercharger. The housing of the charger is usually made of a highly heat-resistant or heat-resistant material, because it is also arranged in the region of the internal combustion engine and in the case of the exhaust gas turbocharger with hot exhaust gas of the internal combustion engine is applied.

In an alternative embodiment, however, it can also be provided that the flame channel are guided around the loader or its housing fluidically. Additionally, the flame channel may be arranged to be substantially thermally isolated from the loader.

In a further embodiment of the invention it is provided that the flame channel opens into the exhaust pipe upstream of the catalyst and / or downstream of the supercharger. In order to supply the catalyst with the thermal energy generated by means of the burner, the flame channel preferably opens into the exhaust gas line upstream of the catalytic converter. If the supercharger, in particular the exhaust-gas turbocharger, is provided, then-according to the above statements-it can be provided that the confluence of the flame-channel into the exhaust-gas line is present only downstream of the supercharger. Preferably, therefore, the thermal energy generated by the burner is guided around the loader, so that with her the exhaust gas taken in the exhaust gas turbocharger enthalpy can be at least partially compensated again. Accordingly, the catalyst can be heated much faster.

It can be provided that the catalyst has a catalytically active support body and the flame channel opens directly upstream or in the region of the support body in the catalyst. The support body is made for example Ceramics and is obtained in particular by extrusion from a ceramic mass. Subsequently, for example, a catalytically active material is applied to this support body. The support body is arranged in a catalyst housing, which is flowed through during operation of the internal combustion engine of the exhaust gas, so that the support body is overflowed and / or flows through. Preferably, the support body has a very large effective surface on which the catalytically active coating is present. Accordingly, a high degree of conversion of the pollutants contained in the exhaust gas is achieved.

The catalyst housing is connected to the exhaust pipe of the exhaust system upstream of the exhaust manifold. In addition, the catalyst may be downstream of the supercharger. In order to achieve an immediate loading of the support body with the heat generated in the burner, the flame channel should be immediately upstream of the support body in the catalyst or the exhaust pipe tired. The junction should be arranged such that the support body is not only selectively applied to the thermal energy. Rather, preferably a full-surface admission should be present. Of course, the introduction of the thermal energy can also be provided in the region of the support body, so that the flame channel - viewed in the flow direction of the exhaust gas - upstream of one end of the support body, but downstream of a beginning of the support body opens into the catalyst. The flame channel or its junction is preferably oriented such that the fluid flowing through it is directed directly onto the support body.

Additionally or alternatively, it may be provided that the catalytic converter is connected to the exhaust gas line via an exhaust gas diffuser or has the exhaust gas diffuser connected to the exhaust gas line, wherein the flame channel opens into the exhaust gas diffuser, in particular a diffuser lateral surface of the exhaust gas diffuser. In the region of the support body, the catalyst has a larger cross section than the exhaust pipe. Accordingly, an expansion of the flow cross-section starting from the exhaust pipe to the support body must be provided. Either the exhaust gas diffuser is thus provided between the exhaust gas line and the catalytic converter or this is part of the catalytic converter and causes an expansion of the flow cross section in the direction of the supporting body. In order to effect a particularly direct loading of the catalyst or the support body with the thermal energy generated by means of the burner, this is to be introduced in the region of the exhaust gas diffuser. Accordingly, the flame channel opens into the exhaust diffuser. Particularly preferably, he passes through the diffuser outer surface. In order to achieve a particularly uniform distribution of the thermal energy, distributed over the circumference of the exhaust diffuser or the diffuser outer surface can be provided more orifice sites of the flame channel. These are particularly preferably on a common annular surface and / or are equally spaced in the circumferential direction. Preferably, at least three or at least four such mouth points are provided.

Finally, it can be provided in a particularly preferred embodiment of the invention that the exhaust manifold is formed integrally with the cylinder head. For example, the exhaust manifold is formed in the manufacture of the cylinder head with. In addition, the exhaust manifold and the cylinder head are particularly preferably of the same material, ie they consist of the same material. This makes it possible in a particularly simple manner to cool both the exhaust manifold and the cylinder head with a common cooling device, wherein at least one coolant line extends through both the exhaust manifold and through the cylinder head.

The invention will be explained in more detail with reference to the embodiments illustrated in the drawings, without any limitation of the invention. Showing:

1 a schematic representation of a drive device with an internal combustion engine, an exhaust system and a heater for heating a catalyst of the exhaust system, and

2 another embodiment of the 1 known drive device.

The 1 shows a schematic representation of a drive device 1 with an internal combustion engine 2 , which in the embodiment shown here has four cylinders 3 features. These cylinders 3 are each about at least one exhaust valve 4 (here: two exhaust valves each 4 ) with an exhaust manifold 5 or with exhaust ducts 6 the exhaust manifold 5 flow-connected. In the exhaust manifold 5 become the exhaust ducts 6 merged and subsequently lead together in an exhaust pipe 7 an exhaust system 8th the drive device 1 one. The exhaust valves 4 are in a cylinder head 9 the internal combustion engine 2 arranged, which particularly preferably together with the exhaust manifold 5 , therefore, so one piece and uniform material, is formed.

Downstream (with respect to a main flow direction of exhaust gas of the internal combustion engine 2 passing through the exhaust valves 4 from the cylinders 3 is applied) is a turbine 10 one exhaust gas turbocharger 11 in the exhaust pipe 7 intended. The turbine 10 is with a compressor of the exhaust gas turbocharger, not shown here 11 thus actively connected and thus serves its drive. So will the turbine 10 of exhaust gas of the internal combustion engine 2 flows over or flows through, so is in the turbine 10 First, enthalpy of the exhaust gas is converted into flow energy. This flow energy is subsequently at least partially removed and converted into kinetic energy, in particular rotational energy. This is used to drive the compressor. With the help of the compressor air, especially fresh air, compressed and subsequently the internal combustion engine 2 made available. In this way, the power density or the efficiency of the internal combustion engine 2 be increased significantly. Downstream of the turbine 10 the exhaust gas turbocharger 11 is a catalyst 12 to the exhaust pipe 7 connected. The catalyst 12 consists of at least a catalyst housing 13 , a catalytically active support body arranged therein 14 and one upstream of the support body 14 provided exhaust diffuser 15 , About the exhaust diffuser 15 is the supporting body 14 with the exhaust pipe 7 fluidly connected, wherein it serves in particular to the flow cross-section, starting from the exhaust pipe 7 up to the support body 14 dilate.

In the operation of the drive device 1 is for effective cleaning of the exhaust gas of the internal combustion engine 2 with the help of the catalyst 12 in particular to observe its temperature, which at least one operating temperature of the catalyst 12 should correspond. This is especially at low outside temperatures and / or at a cold start of the internal combustion engine 2 not guaranteed. Even if the drive device 1 Component of a hybrid drive device is, in which the internal combustion engine 2 at least temporarily out of service, the temperature of the catalyst 12 or the supporting body 14 less than the operating temperature, if no additional heating is done. Accordingly, the exhaust gas of the internal combustion engine 2 at least not be cleaned effectively until after the exhaust gas turbocharger 11 still contained in the exhaust gas thermal energy the catalyst 12 sufficiently far, so at least has heated up to the operating temperature.

To speed up this process of heating, is the drive device 1 a heater 16 with a burner 17 assigned. This has a mixture formation chamber 18 and a combustion chamber 19 on. Into the mixture formation chamber 18 open a fuel supply line 20 and an air supply line 21 at the mouth points 22 and 23 one. In the case of the fuel supply line 20 this is done via a delivery device 24 with a switching valve or metering valve. There is also an ignition device 25 , For example, in the form of a glow plug provided. To minimize the heat input of the fuel supply line 20 and the air supply line 21 To achieve, it is now envisaged that at least one of the estuaries 22 and 23 , in the embodiment shown here both estuaries 22 and 23 in the cylinder head 9 the internal combustion engine 2 are arranged.

Particularly advantageous is the entire mixture formation chamber 18 in the cylinder head 9 recorded while the combustion chamber 19 outside the cylinder head 9 is present. The mixture formation chamber 18 and the combustion chamber 19 are now designed such that the introduction of the fuel through the fuel supply line 20 and introducing the air through the air supply line 21 into the mixture formation chamber 18 takes place, the actual combustion after ignition with the help of the ignition device 25 but preferably only in the combustion chamber 19 expires. Accordingly, the cylinder head 9 only slightly charged with temperature. In addition, however, is a holding element 26 provided, which the mixture formation chamber 18 and the combustion chamber 19 completely encompasses in the circumferential direction, so that it over the entire circumference between the mixture formation chamber 18 and the cylinder head 9 is present. The holding element 26 can extend over the entire longitudinal extent of the mixture formation chamber 18 and combustion chamber 19 extend. In the exemplary embodiment shown here, however, it only extends over a region of the mixture-forming chamber in the longitudinal direction 18 and the combustion chamber 19 , The holding element 26 is preferably made of a heat-resistant material.

In addition, at least one cooling element in the region of the mixture formation chamber 18 in the cylinder head 9 be provided to ensure adequate cooling of the cylinder head 9 also around the mixture formation chamber 18 to ensure around. Particularly preferably, such a cooling element, for example a coolant line or a coolant chamber, surrounds the mixture-forming chamber 18 in the circumferential direction at least partially, in particular completely. The through the fuel supply line 20 into the mixture formation chamber 18 introduced fuel and through the air supply line 21 supplied air are in the mixture formation chamber 18 mixed into a fuel-air mixture, which subsequently into the combustion chamber 19 enters and burns there. The combustion chamber 19 is at least partially by a flame channel 27 trained or is connected to this alternative.

On the combustion chamber 19 opposite side opens the flame channel 27 in the catalyst 12 one. The combustion chamber 19 has at its output via a nozzle 28 , So a reduced cross-section in the flow direction. As shown, the combustion chamber is located 19 and also at least a portion of the flame channel 27 in the exhaust manifold 5 in front. However, they run parallel to the exhaust ducts 6 , are therefore not directly connected fluidically to this. Also to the turbine 10 the exhaust gas turbocharger 1 is the flame channel 27 arranged in parallel. Only in the catalyst 12 becomes the means of the burner 17 generated thermal energy supplied to the exhaust gas. For this purpose, the flame channel passes through 27 for example, a diffuser shell surface 29 the exhaust diffuser 15 , Thus, the flame channel opens 27 downstream of the exhaust gas turbocharger 11 but downstream of the support body 14 , in the catalyst 12 or the exhaust pipe 7 one. Following the catalyst 12 the exhaust gas is, for example, in the direction of an exhaust of a motor vehicle, which the drive device 1 is allocated, discharged. Through this it passes into an external environment of the drive device 1 ,

The 2 shows a further embodiment of the drive device 1 in a schematic representation. Basically, reference is made to the above statements. However, it is not provided here, the thermal energy at the exhaust gas turbocharger 11 passing out. Rather, the exhaust gas turbocharger 11 arranged such that the combustion chamber 19 at least partially in his housing 30 is arranged. It is now provided that the thermal energy still in the housing of the exhaust gas turbocharger 11 but downstream of the turbine 10 , in the exhaust of the internal combustion engine 2 is introduced. Thus, through the exhaust pipe 7 already reheated exhaust gas to the catalyst 12 fed to its heating. Once again it can be seen that in the mixture formation chamber 18 only the mixing of fuel and air to the fuel-air mixture should take place. This is only subsequently in the combustion chamber 19 ignited and burned there.

While the mixture formation chamber 18 completely in the cylinder head 9 is included, the combustion chamber is located 19 outside of this and is instead in the case 30 the exhaust gas turbocharger 11 arranged. To the fuel supply line 20 and the mixture formation chamber 18 To cool is a cooling element 31 provided that the mixture formation chamber 18 completely encompasses in the circumferential direction and particularly preferably to a cooling device or a water jacket of the internal combustion engine 2 or the cylinder head 9 connected.

With the embodiments of the drive device described above 1 becomes a reliable operation of the heater 16 or the burner 17 allows because it is in the fuel supply line 20 due to the arrangement in the preferably cooled cylinder head 9 can not lead to overheating of the fuel and thus to a blistering. Also, the total mass is through the burner 17 heated elements are reduced, so after disabling the heater 16 Their temperature can be reduced much faster than known from the prior art drive means 1 ,

LIST OF REFERENCE NUMBERS

1

driving means

2

Internal combustion engine

3

cylinder

4

outlet valve

5

exhaust manifold

6

exhaust duct

7

exhaust pipe

8th

exhaust system

9

cylinder head

10

turbine

11

turbocharger

12

catalyst

13

catalytic converter housing

14

supporting body

15

exhaust diffuser

16

heater

17

burner

18

Mixture formation chamber

19

combustion chamber

20

Fuel supply line

21

Air supply line

22

opening point

23

opening point

24

infuser

25

detonator

26

holding member

27

Flash channel

28

jet

29

Diffuser shell surface

30

casing

31

cooling element

Claims (10)

Drive device ( 1 ) with an internal combustion engine ( 2 ), with a to the internal combustion engine ( 2 ) connected exhaust system ( 8th ), which is a catalyst ( 12 ) for cleaning exhaust gas of the internal combustion engine ( 2 ), and with a heating device ( 16 ) for heating the catalyst ( 12 ), wherein the heating device ( 16 ) a burner ( 17 ) with a mixture formation chamber ( 18 ), which in a fuel supply line ( 20 ) and a Air supply line ( 21 ), characterized in that at least one of the mouths ( 22 . 23 ) of the fuel supply line ( 20 ) and the air supply line ( 21 ) into the mixture formation chamber ( 18 ) in a cylinder head ( 9 ) of the internal combustion engine ( 2 ) is arranged. Drive device according to claim 1, characterized in that in the flow direction of the mixture formation chamber ( 18 ) a combustion chamber ( 19 ), which outside the cylinder head ( 9 ) is arranged. Drive device according to one of the preceding claims, characterized in that in the cylinder head ( 9 ) a fuel supply line and / or an air supply line for supplying at least one cylinder ( 3 ) of the internal combustion engine ( 2 ) is provided with fuel or air, wherein the fuel supply line ( 20 ) to the fuel supply line and / or the air supply line ( 21 ) is connected to the air supply line. Drive device according to one of the preceding claims, characterized in that the fuel supply line is associated with a fuel delivery device, in particular a high-pressure fuel delivery device, wherein the fuel supply line ( 20 ) is connected to the fuel supply line upstream of the fuel delivery device. Drive device according to one of the preceding claims, characterized in that the fuel supply line ( 20 ) a switching valve for adjusting the mixture in the mixture ( 18 ) is assigned to introduced mass flow. Drive device according to one of the preceding claims, characterized in that the cylinder head ( 9 ) a cooling device with at least one cooling element ( 31 ), wherein the cooling element ( 31 ) adjacent to the mixture formation space ( 18 ) is arranged. Drive device according to one of the preceding claims, characterized in that the cylinder head ( 9 ), in particular the at least one cylinder ( 3 ), via an exhaust manifold ( 5 ) with an exhaust pipe ( 7 ) of the exhaust system ( 8th ) is fluidly connected and the exhaust manifold ( 5 ) a flame channel ( 27 ) which is connected to the mixture formation chamber ( 18 ) is connected, and the at least one portion of the combustion chamber ( 19 ) trains. Drive device according to one of the preceding claims, characterized in that the combustion chamber ( 19 ) and / or the flame channel ( 27 ) at least partially in a housing ( 30 ) of an exhaust gas turbocharger ( 11 ) are arranged. Drive device according to one of the preceding claims, characterized in that the flame channel ( 27 ) upstream of the catalyst ( 12 ) and / or downstream of the exhaust gas turbocharger ( 11 ) in the exhaust pipe ( 7 ). Drive device according to one of the preceding claims, characterized in that the exhaust manifold ( 5 ) in one piece with the cylinder head ( 9 ) is trained.

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