DE102019006008A1 - 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, with an intake tract (14) through which air can flow. An air filter (13) for filtering the air flowing through the intake tract (14) is arranged in the intake tract (14). An exhaust gas tract (20) through which exhaust gas from the internal combustion engine (10) can flow is provided, in which at least one exhaust gas aftertreatment element (34, 36) through which the exhaust gas can flow is arranged for aftertreatment of the exhaust gas. An exhaust gas recirculation line (30) is provided, by means of which at least part of the exhaust gas flowing through the exhaust gas tract (20) can be returned from the exhaust gas tract (20) to the intake tract (14) and introduced into the intake tract (14). An air path (40) that can be supplied with air from the surroundings (38) of the internal combustion engine (10) and through which air from the surroundings (38) can flow is provided, in which the air filter (13), the exhaust gas recirculation line (30) and the Exhaust aftertreatment element (34, 36) are arranged.

Description

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

Such an internal combustion engine for a motor vehicle, in particular for a motor vehicle, is already the DE 10 2009 043 087 A1 as known. The internal combustion engine has an intake tract through which air can flow, by means of which, for example, cylinders of the internal combustion engine can be supplied with the air flowing through the intake tract. In addition, the internal combustion engine has an exhaust tract through which exhaust gas from the internal combustion engine can flow, the exhaust gas originating, for example, from the cylinders. At least one exhaust gas aftertreatment element, through which the exhaust gas can flow, for aftertreating the exhaust gas is arranged in the exhaust gas tract. The internal combustion engine also has an exhaust gas recirculation line, by means of which at least part of the exhaust gas flowing through the exhaust gas tract can be returned from the exhaust gas tract to the intake tract and introduced into the intake tract.

In addition, the DE 10 2017 217 838 A1 an internal combustion engine, with an exhaust system for discharging exhaust gas from the internal combustion engine. From the DE 10 2016 211 274 A1 a method for exhaust gas aftertreatment of an internal combustion engine is known. In addition, the DE 10 2010 044 102 A1 an exhaust system for an internal combustion engine.

The object of the present invention is to further develop an internal combustion engine of the type mentioned at the outset in such a way that particularly low-emission operation can be implemented.

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

In order to further develop an internal combustion engine of the type specified in the preamble of claim 1 in such a way that particularly low-emission operation of the internal combustion engine can be implemented, according to the invention, air from the surroundings of the internal combustion engine, in particular the motor vehicle, can be supplied with air from the surroundings and can therefore be flown through Air path provided. The air filter, by means of which the air flowing into or introduced into the air path can be filtered from the environment, is arranged in the air path. This means that the air path includes the air filter. In other words, the air filter is part of the air path. The air path also includes the exhaust gas recirculation line. In other words, the exhaust gas recirculation line is also arranged in the air path. In this case, the exhaust gas recirculation line is arranged downstream of the air filter in the flow direction of the air flowing through the air path, and the air from the surroundings that is filtered by means of the air filter can flow through it. This means that the air which flows into the air path flows through the air path and thereby initially flows through the air filter and is filtered by means of the air filter. As a result, the air flowing through the air path flows through the exhaust gas recirculation line, so that the exhaust gas recirculation line is or runs downstream of the air filter in the flow direction of the air flowing through the air path. For example, the exhaust gas recirculation line bypasses at least one cylinder or all cylinders of the internal combustion engine. This means that the air flowing through the exhaust gas recirculation line and the air path as a whole bypasses the or all cylinders of the internal combustion engine that can be supplied by means of the intake tract with the air flowing through the intake tract and thus does not flow through the cylinders or through any cylinder of the internal combustion engine. Overall, it can be seen that the exhaust gas recirculation line is part of the air path. The exhaust gas recirculation line thus has a double function. On the one hand, the exhaust gas recirculation line is used to return exhaust gas from the exhaust gas tract to the intake tract. On the other hand, the exhaust gas recirculation line is used - as will be explained in more detail below - to supply the exhaust gas aftertreatment element with air, in particular fresh air, from the environment.

The exhaust gas aftertreatment element, which is arranged downstream of the exhaust gas recirculation line in the flow direction of the air flowing through the air path, is also arranged in the air path. The exhaust gas aftertreatment element can be supplied with the air flowing through the exhaust gas recirculation line from the environment by means of the exhaust gas recirculation line and the air flowing through the exhaust gas recirculation line can thereby flow through from the environment. The exhaust gas aftertreatment element is thus arranged both in the exhaust gas tract and in the air path. In addition, a fan is arranged in the air path, which fan is also arranged in the exhaust tract. The fan is arranged downstream of the exhaust gas aftertreatment element in the flow direction of the air flowing through the air path, so that the air from the environment can be conveyed into the air path and through the air path by means of the fan. The air that flows into the air path thus initially flows through the air filter and is filtered by the air filter. The air flowing through the air path then flows through the exhaust gas recirculation line and is guided to the exhaust gas aftertreatment element by means of the exhaust gas recirculation line. The air flowing through the air path then flows through the exhaust gas aftertreatment element, whereupon the air flowing through the air path flows to or through the fan. The fan can be a suction pump, a flow machine, in particular a turbine, or an air injection system.

In particular, the fan can function as a suction pump, by means of which a gas contained or absorbed in the exhaust gas, in particular exhaust gas from the internal combustion engine, can be conveyed out of the exhaust gas tract or sucked off. By sucking off the gas from the exhaust tract, also referred to as the exhaust system, by means of the suction pump, also referred to simply as a pump, a negative pressure is created in the exhaust tract. When the negative pressure is created, air from the environment is sucked into the air path and finally conveyed through the air path. Since the air path includes the air filter, the air that comes from the environment and finally flows through the exhaust gas aftertreatment element is so-called clean air. In particular, a mass flow can be generated by means of the fan. This mass flow is formed, for example, by the aforementioned gas, in particular exhaust gas, which is initially included in the exhaust gas, for example, and is conveyed or sucked out of the exhaust gas by means of the fan. For example, the gas or the mass flow is the air which is conveyed through the air path by means of the fan.

The fan preferably has a nozzle through which the air conveyed by means of the fan can flow. As a result, air can be conveyed through the air path particularly effectively and efficiently. The air from the environment flowing through the air path contains a particularly large amount of oxygen, by means of which the exhaust gas aftertreatment element can be temperature controlled particularly advantageously, i.e. in particular heated or kept warm, in particular also while the internal combustion engine is still in fired operation or while the engine is running is deactivated.

For example, the exhaust gas aftertreatment element is a particle filter or the exhaust gas aftertreatment element comprises a particle filter. By means of the particle filter, particles contained in the exhaust gas, in particular soot particles, can be filtered out of the exhaust gas. Because the exhaust gas aftertreatment element can be supplied with the air from the environment by means of the air path so that the air from the environment can flow through the exhaust gas aftertreatment element, for example, a burn-off or continued burning of soot contained in the particle filter can be caused, promoted or fanned. As a result, the particle filter can also be regenerated, for example, if the internal combustion engine continues to operate, i.e. if no combustion processes are taking place in the or all cylinders of the internal combustion engine or the internal combustion engine is deactivated.

The effect of the suction described above can be improved, for example, by using a Venturi nozzle. In other words, a Venturi nozzle is preferably arranged in the air path, via which the air from the environment can be sucked into the air path by means of the blower and can be conveyed through the air path. In particular, the Venturi nozzle is, for example, part of a jet pump, by means of which, for example, the air can be conveyed from the environment. Here, the air from the environment is, for example, what is known as a suction medium, which is sucked into the air path by means of a propellant medium and conveyed through the air path in that the propellant medium is conveyed by means of the fan. For example, the gas initially received in the exhaust tract or flowing through the exhaust tract, in particular exhaust gas, is used as the propellant medium. The propellant flows through the jet pump, which has the aforementioned Venturi nozzle, for example. In this way, a negative pressure is generated in a well-known manner, by means of which the suction medium is sucked into the jet pump and, for example, through the jet pump. In the jet pump, for example, the suction medium mixes with the propellant medium, whereupon the suction medium and the propellant medium, in particular together, flow through the exhaust gas aftertreatment element. In this way, the exhaust gas aftertreatment element can be particularly advantageously supplied with the air from the environment.

The exhaust gas aftertreatment element is also referred to as an exhaust aftertreatment unit and comprises, for example, a catalytic converter, in particular an oxidation catalytic converter, and / or a particle filter, in particular a diesel particulate filter (DPF), and / or an SCR catalytic converter and / or another exhaust gas aftertreatment component. By using the air path, a particularly low-emission operation of the internal combustion engine can be implemented, so that in particular the CO ₂ emissions of the Internal combustion engine can be kept low. In addition, the oil dilution can be reduced compared to conventional solutions. Furthermore, it is possible to realize the air path in a particularly space-saving and in particular almost space-neutral manner, so that particularly low-emission operation of the internal combustion engine can be implemented in a space-saving manner.

The exhaust gas recirculation line is also referred to as an EGR section or is an EGR section by means of or along which exhaust gas can be recirculated from the exhaust gas tract into the intake tract and introduced into the intake tract. In particular, the exhaust gas recirculation line is a high pressure exhaust gas recirculation line and thus part of a high pressure exhaust gas recirculation device, by means of which high pressure exhaust gas recirculation (HP-EGR) can be carried out. The exhaust gas recirculation line is fluidly connected to the exhaust tract at a first connection point and fluidly connected to the intake tract at a second connection point, so that at least part of the exhaust gas can be branched off from the exhaust gas tract at the first connection point and introduced into the exhaust gas tract by means of the exhaust gas recirculation line. The exhaust gas branched off from the exhaust tract and introduced into the intake tract is routed to the intake tract and in particular to the second connection point by means of the exhaust gas recirculation line and can flow out of the exhaust gas recirculation line at the second connection point and flow into the intake tract.

For example, at least one turbine of an exhaust gas turbocharger is arranged in the exhaust gas tract. In particular, when the exhaust gas recirculation line is part of a high pressure exhaust gas recirculation device, the first connection point is arranged upstream of the turbine, in particular upstream of all turbines arranged in the exhaust tract, for example in the flow direction of the exhaust gas flowing through the exhaust gas tract.

Further advantages, features and details of the invention emerge from the following description of a preferred exemplary embodiment and with reference to the drawing. The features and combinations of features mentioned above in the description as well as the features and combinations of features mentioned below in the description of the figures and / or shown alone in the single figure can be used not only in the specified combination, but also in other combinations or on their own, without the frame to leave the invention.

The single figure of the drawing shows a schematic representation of an internal combustion engine according to the invention for a motor vehicle.

The single FIGURE shows, in a schematic representation, an internal combustion engine, also referred to as an internal combustion engine 10 for a motor vehicle designed, for example, as a motor vehicle, in particular as a passenger vehicle. This means that the motor vehicle in its fully manufactured state is the internal combustion engine 10 and by means of the internal combustion engine 10 is drivable. The internal combustion engine 10 has a housing element designed, for example, as a crankcase 12th which is also referred to as an engine block and at least one or more cylinders of the internal combustion engine, which cannot be seen in the figure 10 form. During fired operation of the internal combustion engine 10 combustion processes take place in the cylinders. As part of the respective combustion process, a fuel-air mixture is burned, resulting in exhaust gas from the internal combustion engine 10 results.

The internal combustion engine 10 an intake tract through which air can flow 14th by means of which the or all cylinders of the internal combustion engine 10 can be supplied with the air flowing through the intake tract. The internal combustion engine 10 also has, for example, an exhaust gas turbocharger 16 on, which one in the intake tract 14th comprises arranged compressor. By means of the compressor, the intake tract 14th Air flowing through are compressed. The compressed air is also known as charge air. It is in the intake tract 14th a so-called charge air distributor 18th arranged, by means of which the charge air is divided or distributed to the cylinders. In the intake tract 14th is an air filter 13th arranged, by means of which the intake tract 14th is to be filtered or is filtered through air flowing through.

The internal combustion engine 10 also has an exhaust tract 20th on which of the exhaust gas of the internal combustion engine 10 , that is, the exhaust gas from the cylinders can flow through. The exhaust tract shows this 20th an exhaust pipe through which the exhaust gas can flow 22nd on. It is also in the exhaust tract 20th a manifold also known as an exhaust manifold or exhaust manifold 24 arranged, which in the flow direction of the exhaust tract 20th exhaust gas flowing through upstream of the exhaust pipe 22nd is arranged. The exhaust gas turbocharger 16 has one in the exhaust tract 20th arranged turbine 26th on, by means of which the compressor can be driven. The turbine 26th is from the exhaust tract 20th Drivable exhaust gas flowing through.

The internal combustion engine 10 also has an exhaust gas recirculation device 28 on which at least one exhaust gas recirculation line 30th includes. The exhaust gas recirculation line 30th is at a first connection point, also known as a branch point V1 fluidically with the exhaust tract 20th and at a second connection point, also known as the discharge point V2 fluidically with the intake tract 14th connected. This allows by means of the exhaust gas recirculation line 30th at least part of the exhaust tract 20th exhaust gas flowing through from the exhaust tract 20th branched off and into the exhaust gas recirculation line 30th be initiated. The branched off and into the exhaust gas recirculation line 30th Introduced exhaust gas can use the exhaust gas recirculation line 30th flow through and is by means of the exhaust gas recirculation line 30th to the intake tract 14th returned and especially at the junction V2 in the intake tract 14th initiated. This includes, for example, the exhaust gas recirculation device 28 A valve element, not shown in the figure, which is in the exhaust gas recirculation line 30th is arranged and designed as an exhaust gas recirculation valve. By means of the valve element, for example, a quantity of the exhaust gas recirculation line 30th flowing through and thus recirculated exhaust gas can be adjusted.

In the exhaust tract 20th is also an exhaust aftertreatment device 32 arranged, which at least two exhaust aftertreatment elements 34 and 36 having. The exhaust aftertreatment elements 34 and 36 are in the direction of flow of the exhaust tract 20th The exhaust gas flowing through is arranged one after the other or one behind the other, the exhaust gas aftertreatment element 34 downstream of the exhaust aftertreatment element 36 is arranged. Both exhaust aftertreatment elements 34 , 36 are in the direction of flow of the exhaust tract 20th exhaust gas flowing through downstream of the manifold 24 and downstream of the turbine 26th arranged.

This is about a particularly low-emission operation of the internal combustion engine 10 To be able to realize is one with air from an environment 38 the internal combustion engine 10 , in particular of the motor vehicle, can be supplied and thus from the air from the environment 38 permeable air path 40 intended. In the air path 40 is the air filter 13th arranged, by means of which the in the air path 40 air introduced or flowing in from the environment 38 is to be filtered or is being filtered. Also is in the air path 40 the exhaust gas recirculation line 30th arranged, which in the flow direction of the air path 40 air flowing through downstream of the air filter 13th arranged and thereby by the means of the air filter 13th filtered air from the environment 38 is permeable. Furthermore are in the air path 40 those in the exhaust tract 20th , especially in the exhaust pipe 22nd , arranged exhaust aftertreatment elements 34 and 36 arranged. Here are the exhaust aftertreatment elements 34 and 36 in the direction of flow of the air path 40 air flowing through downstream of the exhaust gas recirculation line 30th arranged. This is done in particular in such a way that the connection point V1 in the direction of flow of the exhaust tract 20th exhaust gas flowing through or in the direction of flow of the air path 40 air flowing through upstream of the exhaust gas aftertreatment elements 34 and 36 , especially upstream of the turbine 26th , is arranged. For example, the air from the environment 38 first the air filter 13th flow through and then at the junction V2 from the intake tract 14th flow out and into the exhaust gas recirculation line 30th pour in. The ones in the exhaust gas recirculation line 30th inflowing air from the environment 38 is by means of the exhaust gas recirculation line 30th to the exhaust tract 20th out and can in particular at the junction V1 from the exhaust gas recirculation line 30th flow out and into the exhaust tract 20th pour in. The air then flows out of the exhaust gas recirculation line 30th through the turbine 26th and in particular through the exhaust aftertreatment elements 34 and 36 . Overall, it can be seen that the exhaust gas aftertreatment elements 34 and 36 by means of the exhaust gas recirculation line 30th with which the exhaust gas recirculation line 30th air flowing through it from the environment 38 can be supplied and thereby from the exhaust gas recirculation line 30th air flowing through it from the environment 38 are permeable.

In the air path 40 is also a blower 42 arranged, which is also in the exhaust tract 20th is arranged. The blower 42 is in the direction of flow of the exhaust tract 20th exhaust gas flowing through downstream of exhaust gas aftertreatment elements 34 and 36 in the exhaust tract 20th arranged. Also is the blower 42 in the direction of flow of the air path 40 air flowing through downstream of the exhaust gas aftertreatment elements 34 and 36 arranged. Thus, it flows in the air path 40 air flowing through - after it has passed the exhaust aftertreatment elements 34 and 36 has flowed through - to the blower 42 . By means of the fan 42 is or will be the air from the environment 38 in the air path 40 conveyable in or conveyed in and through the air path 40 conveyable through or conveyed through. The blower 42 is, for example, a turbomachine or a turbine. Alternatively or additionally, the fan 42 for example a nozzle on which the air path 40 can flow through air flowing through. This allows air to flow through the air path particularly effectively and efficiently 40 be promoted through it.

In the air path, for example, a rear silencer is also arranged, which is also in the exhaust tract 20th is arranged. In the direction of flow of the air path 40 the air flowing through is the rear silencer downstream of the fan 42 arranged. In the direction of flow of the exhaust tract 20th The exhaust gas flowing through is the rear silencer downstream of the fan 42 arranged. In addition, it is preferably provided, for example, that the air path 40 in or to the environment 38 flows out. This allows the air path 40 air flowing through after turning the blower 42 happened from the air path 40 flow out and back to or into the environment 38 stream. Because the junction V1 upstream of the turbine 26th is arranged, can by means of the exhaust gas recirculation device 28 high-pressure exhaust gas recirculation (HP-EGR) can be carried out.

At least one of the exhaust aftertreatment elements 34 and 36 has, for example, a particle filter by means of which soot can be filtered out of the exhaust gas. Because the respective exhaust gas aftertreatment element 34 respectively 36 with the air from the environment 38 can be supplied, being airborne from the environment 38 a particularly large amount of oxygen is contained, the particle filter can be regenerated particularly advantageously, in particular also when the internal combustion engine 10 is deactivated or when the fired operation of the internal combustion engine 10 is omitted. In particular, the soot contained in the particle filter can be activated and / or the soot contained in the particle filter can continue to burn. In other words, it is possible to promote or fan the burn-off or the continued burning of the soot in the particle filter, in particular also when the internal combustion engine is being operated 10 is omitted.

List of reference symbols

10

Internal combustion engine

12th

Housing element

13th

Air filter

14th

Intake tract

16

Exhaust gas turbocharger

18th

Charge air distributor

20th

Exhaust tract

22nd

Exhaust pipe

24

Elbow

26th

turbine

28

Exhaust gas recirculation device

30th

Exhaust gas recirculation line

32

Exhaust aftertreatment device

34

Exhaust aftertreatment element

36

Exhaust aftertreatment element

38

Surroundings

40

Air path

42

fan

V1

Junction

V2

Junction

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 102009043087 A1 [0002]
• DE 102017217838 A1 [0003]
• DE 102016211274 A1 [0003]
• DE 102010044102 A1 [0003]

Claims (6)

Internal combustion engine (10) for a motor vehicle, with an intake tract (14) through which air can flow, with an air filter (13) arranged in the intake tract (14) for filtering the air flowing through the intake tract (14), with an exhaust gas from the internal combustion engine (10) ) through-flow exhaust gas tract (20), in which at least one exhaust gas aftertreatment element (34, 36) through which the exhaust gas can flow is arranged for aftertreatment of the exhaust gas, and with an exhaust gas recirculation line (30), by means of which at least part of the exhaust gas flowing through the exhaust gas tract (20) from the exhaust gas tract (20) can be returned to the intake tract (14) and can be introduced into the intake tract (14), characterized by an air supply from an environment (38) of the internal combustion engine (10) and thereby air from the environment (38) through which the air path (40) can flow and in which are arranged: the air filter (13), by means of which the air introduced into the air path (40) from the environment (38 ) is to be filtered, - the exhaust gas recirculation line (30) which is arranged downstream of the air filter (! 3) in the flow direction of the air flowing through the air path (40) and through which the air from the surroundings (38) filtered by means of the air filter (13) can flow, - the in the flow direction of the air flowing through the air path (40) downstream of the exhaust gas recirculation line (30) arranged exhaust gas aftertreatment element (34, 36) which can be supplied by means of the exhaust gas recirculation line (30) with the air flowing through the exhaust gas recirculation line (30) from the environment (38) and thereby by the air from the surroundings (38) flowing through the exhaust gas recirculation line (30) can flow through it, and - a fan (42) arranged in the exhaust gas tract (20) with respect to the direction of flow of the air flowing through the air path (40) downstream of the exhaust gas aftertreatment element (34, 36) , by means of which the air from the environment (38) can be conveyed into the air path (40) and can be conveyed through the air path (40). Internal combustion engine (10) after Claim 1 , characterized in that a valve element is arranged in the exhaust gas recirculation line (30), by means of which an amount of air flowing through the air path (40) and / or an amount of the exhaust gas to be recirculated can be set. Internal combustion engine (10) after Claim 1 or 2 , characterized in that the fan (42) has a nozzle through which the air flowing through the air path (40) can flow. Internal combustion engine (10) according to one of the preceding claims, characterized by a Venturi nozzle, via which the air from the environment (38) can be sucked in by means of the fan (42) and thereby sucked into the air path (40) and through the air path (40) is conveyed through. Internal combustion engine (10) according to one of the preceding claims, characterized in that the air path (40) opens into the surroundings (38) downstream of the fan (42). Internal combustion engine (10) according to one of the preceding claims, characterized in that the exhaust gas aftertreatment element (34, 36) has a particle filter.

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