DE102014116274A1 - Exhaust system for an internal combustion engine - Google Patents

Abstract

The present invention relates to an exhaust system (30) for an internal combustion engine (14), in particular for an internal combustion engine (14) of a motor vehicle (10), comprising an exhaust pipe (32) which forms an exhaust system of the exhaust system (30) and which has a catalytic converter (30). 34) and an exhaust gas probe (36), wherein the exhaust gas probe (36) downstream of the catalyst (34) in an exhaust gas flow direction (38), at least two exhaust pipes (42, 44) with different exhaust gas outlet openings of the internal combustion engine (14) and the exhaust pipe (32) are connected to feed exhaust gases of the internal combustion engine (14) directly to the exhaust pipe (32), the exhaust pipes (42, 44) each having an exhaust gas probe (46, 48) which are respectively associated with the exhaust gas outlet.

Description

The present invention relates to an exhaust system for an internal combustion engine, in particular for an internal combustion engine of a motor vehicle, comprising an exhaust pipe forming an exhaust line of the exhaust system and having a catalyst and an exhaust gas probe, wherein the exhaust gas downstream of the catalyst in an exhaust gas flow direction, and at least two exhaust pipes, which are connected to different exhaust gas outlet openings of the internal combustion engine and with the exhaust pipe to supply exhaust gases of the internal combustion engine directly to the exhaust pipe.

The invention further relates to an internal combustion engine for a motor vehicle with a plurality of cylinders, which are connected to an exhaust system to remove exhaust gas from the cylinders.

In the field of internal combustion engines, it is well known to catalyze exhaust gas by means of catalysts and to detect the composition of the exhaust gas by means of lambda probes, so as to check the combustion of the internal combustion engine and the exhaust gas conversion of the catalyst and possibly to regulate.

In the field of motor vehicle drive technology, it is known in internal combustion engines with multiple cylinder banks each cylinder bank each assign an exhaust system and detect the exhaust gases in the exhaust strands both before the catalyst and behind the catalyst and to regulate the internal combustion engine or the respective catalyst. The disadvantage here is that the use of two separate catalysts for each of the drive trains is technically complex and increases both the cost and the weight of the motor vehicle.

It is also known to reduce costs and weight, the exhaust gases of several cylinder banks in an exhaust system or an exhaust pipe and to arrange in this single exhaust pipe both two lambda probes and a catalyst to reduce costs and weight. The disadvantage here is that the combustion of the cylinder banks can not be detected and controlled separately, so that both the exhaust emission and the running quality of the internal combustion engine can not be optimally adjusted.

It is also known in the exhaust system to arrange turbines to use the exhaust pressure as a drive for a turbocharger and to optimize the exhaust emission in both the separate exhaust pipes of the individual cylinder banks and in the combined exhaust gas each to arrange a catalyst, as for example. In the DE 10 2009 020 120 B3 is shown. The disadvantage here is that the weight and cost are increased by the double design of the turbines and catalysts in the individual exhaust pipes and the arrangement of the front lambda probes after turbocharger turbines direct and timely control of the cylinder banks is not possible.

It is therefore an object of the present invention to provide an exhaust system for an internal combustion engine, in which an optimal control of the internal combustion engine is technically possible with little effort.

This object is achieved in the case of the abovementioned exhaust system in that the exhaust pipes each have an exhaust gas probe, which are each associated with the exhaust gas outlet openings.

This object is further achieved in the aforementioned internal combustion engine by an exhaust system according to the present invention.

For the purposes of the present invention, the direct supply of the exhaust gases of the internal combustion engine is to be understood as meaning that the exhaust gases are conducted unfiltered or uncatalyzed out of the exhaust gas outlet openings into the exhaust gas pipe.

Characterized in that the exhaust gases of the internal combustion engine are supplied directly to the exhaust pipe and disposed in the exhaust pipe of the catalyst, the exhaust gas can be catalyzed by a single catalyst and characterized in that the exhaust gas probes are respectively assigned in the exhaust pipes to the exhaust gas outlet of the internal combustion engine, is a fast and precise control of the internal combustion engine possible, so that on the one hand the technical complexity and the weight and the cost of the exhaust system can be reduced and at the same time a precise control of the internal combustion engine is possible.

The object of the invention is thus completely solved.

In a preferred embodiment, an exhaust gas turbine is arranged in the exhaust pipe.

As a result, the exhaust gas pressure in the exhaust pipe can be used, wherein at the same time only an exhaust gas turbine can be used by the arrangement in the individual exhaust pipe, so that the technical complexity is reduced overall.

It is particularly preferred if the exhaust gas turbine in the exhaust gas flow direction upstream of the catalyst in the exhaust pipe.

Thereby, the exhaust pressure can be fully utilized, whereby the efficiency of the exhaust gas turbine can be improved.

It is further preferred if the exhaust gas turbine forms part of a turbocharger.

Thereby, the exhaust pressure can be effectively used to increase the boost pressure of the internal combustion engine.

It is further preferred if the exhaust gas lines are designed to supply the exhaust gas of the internal combustion engine uncatalyzed from the exhaust gas outlet openings to the exhaust gas pipe.

As a result, the technical complexity and the weight of the exhaust system can be reduced, as can be dispensed with additional catalysts in the exhaust pipes.

It is further preferred if the exhaust system has only one catalyst, which is arranged in the exhaust pipe and the exhaust gas of the internal combustion engine is supplied.

As a result, the technical complexity and the weight of the exhaust system can be further reduced since only one catalyst is used to catalyze the exhaust gas.

It is furthermore preferred if the exhaust gas lines are assigned to exhaust gas outlet openings of different cylinder banks of the internal combustion engine.

As a result, the different cylinder banks can be controlled directly and promptly on the basis of the exhaust gas measurements of the exhaust gas probes in the exhaust gas lines, whereby a particularly precise control of the internal combustion engine is possible.

Overall, the technical complexity and the weight of the motor vehicle can be reduced in general by the exhaust system according to the invention, since the exhaust gases are preferably supplied from different cylinder banks directly through the exhaust pipes to the exhaust pipe and catalyzed there by means of the catalyst, the exhaust probes are the exhaust gas outlet directly associated , so that a direct and rapid exhaust gas measurement and a corresponding direct and quick control of the internal combustion engine is possible.

It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention.

Embodiments of the invention are illustrated in the drawings and are explained in more detail in the following description. Show it:

1 a schematic view of a motor vehicle with an internal combustion engine and an exhaust system for discharging exhaust gases; and

2 a schematic view of an exhaust system for an internal combustion engine with two separate cylinder banks.

In 1 a motor vehicle is shown schematically and generally with 10 designated. The car 10 has a drive train 12 on with an internal combustion engine 14 for providing drive power to driven wheels 16R . 16L of the motor vehicle 10 drive.

The internal combustion engine 14 is via a propshaft 18 with a gear 20 connected, the transmission 20 via an output shaft 22 and a differential 24 with the driven wheels 16R . 16L connected to one on the output shaft 22 provided torque t to the driven wheels 16R . 16L transferred to.

The internal combustion engine 14 has two cylinder banks in this particular embodiment 26 . 28 on, which are separately controllable and collectively the cardan shaft 18 drive. The internal combustion engine 14 has an exhaust system 30 on that in 1 is shown schematically and via an exhaust gas of the internal combustion engine 14 from the motor vehicle 10 can be dissipated.

The exhaust system 30 has an exhaust pipe 32 on, the exhaust system of the exhaust system 30 forms and the exhaust gas to a rear portion of the motor vehicle 10 leads to deliver it there to the environment. In the exhaust pipe is an exhaust gas catalyst 34 arranged, which catalyzes or converts the exhaust gas. In the exhaust pipe 32 is also an exhaust gas probe 36 arranged, which is designed as a lambda probe and detects a composition of the exhaust gas. The exhaust gas probe 36 is the catalyst 34 in an exhaust gas flow direction 38 downstream to capture the catalyzed exhaust gas.

In the exhaust pipe 32 is also an exhaust gas turbine 40 arranged by the exhaust pressure in the exhaust pipe 32 is driven and part a turbocharger of the internal combustion engine 14 forms.

The exhaust system 30 also has two exhaust pipes 42 . 44 on, with different exhaust ports of the internal combustion engine 14 and the exhaust pipe 32 are connected to the exhaust gas of the internal combustion engine directly to the exhaust pipe 32 supply. The exhaust pipes 42 . 44 are corresponding to the cylinder banks 26 . 28 connected to the exhaust of the respective cylinder banks 26 . 28 dissipate and supply the exhaust pipe directly and uncatalyzed or unfiltered.

In the exhaust pipes 42 . 44 is in each case an exhaust gas probe 46 . 48 arranged, the exhaust gas outlet of the respective cylinder banks 26 . 28 are assigned to compositions of the exhaust gas directly to the exhaust gas outlet openings of the cylinder banks 26 . 28 capture.

By the arrangement of the exhaust probes 46 . 48 acting as lambda probes 46 . 48 are formed in the vicinity of the exhaust gas outlet openings of the cylinder banks 26 . 28 , the exhaust of the cylinder banks 26 . 28 be detected directly and early, so that a fast lambda control of the cylinder banks 26 . 28 is possible. By doing that the cylinder banks 26 . 28 one exhaust gas probe each 46 . 48 is assigned, is an independent lambda control of the individual cylinder banks 26 . 28 possible.

Because of that the exhaust of the cylinder banks 26 . 28 directly and uncatalyzed or unfiltered the exhaust pipe 32 and thus the exhaust gas turbine 40 is supplied, an optimal use of the exhaust pressure is possible here. Further, the exhaust gas may pass through the single catalyst 34 be catalyzed, resulting in additional catalysts in the exhaust pipes 42 . 44 can be waived.

As a result, thereby the technical complexity of the exhaust system 30 and thus the cost and weight of the motor vehicle 10 be reduced, at the same time a fast lambda control by the special design and arrangement of the exhaust probes 46 . 48 is possible.

In 2 is a schematic view of the exhaust system 30 shown. The same elements are designated by the same reference numerals, in which case only the special features are explained.

The exhaust pipes 42 . 44 are directly with the Abgasauslassöffnungen the respective cylinder banks 26 . 28 connected to the exhaust of the respective cylinder banks 26 . 28 dissipate. In the exhaust pipes 42 . 44 are the exhaust probes 46 . 48 arranged, near the exhaust gas outlet openings of the cylinder banks 26 . 28 to allow a fast lambda control. The exhaust pipes 42 . 44 are merged and with the exhaust pipe 32 connected to the exhaust of the separate cylinder banks 26 . 28 in the single exhaust pipe, which is the exhaust system of the exhaust system 30 forms, feed.

In the single exhaust pipe 32 is the exhaust gas turbine 40 arranged, the exhaust gas turbine 40 the catalyst 34 in the exhaust gas flow direction 38 upstream, in order to use the exhaust gas pressure optimally. The catalyst 34 is the exhaust gas probe 36 in the exhaust gas flow direction 38 downstream to detect the exhaust gas composition of the catalyzed exhaust gas and to allow a corresponding lambda control or fine adjustment of the lambda control.

Overall, therefore, with little technical effort and low cost of materials exhaust system 30 be provided, which allows optimal lambda control by the special arrangement of the exhaust probes.

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

• DE 102009020120 B3 [0006]

Claims (9)

Exhaust system ( 30 ) for an internal combustion engine ( 14 ), in particular for an internal combustion engine ( 14 ) of a motor vehicle ( 10 ), comprising: - an exhaust pipe ( 32 ), which has an exhaust system of the exhaust system ( 30 ) and which is a catalyst ( 34 ) and an exhaust gas probe ( 36 ), wherein the exhaust gas probe ( 36 ) the catalyst ( 34 ) in an exhaust gas flow direction ( 38 ), - at least two exhaust pipes ( 42 . 44 ), which with different exhaust gas outlet openings of the internal combustion engine ( 14 ) and with the exhaust pipe ( 32 ) are connected to exhaust gases of the internal combustion engine ( 14 ) the exhaust pipe ( 32 ), characterized in that the exhaust pipes ( 42 . 44 ) each an exhaust gas probe ( 46 . 48 ), which are respectively associated with the exhaust gas outlet openings. Exhaust system according to claim 1, characterized in that in the exhaust pipe ( 32 ) an exhaust gas turbine ( 40 ) is arranged. Exhaust system according to claim 2, characterized in that the exhaust gas turbine ( 40 ) in the exhaust gas flow direction ( 38 ) the catalyst ( 34 ) is connected upstream. Exhaust system according to claim 2 or 3, characterized in that the exhaust gas turbine ( 40 ) forms part of a turbocharger. Exhaust system according to one of claims 1 to 4, characterized in that the exhaust pipes ( 42 . 44 ) are adapted to the exhaust gas of the internal combustion engine ( 14 ) uncatalyzed from the exhaust gas outlet openings the exhaust pipe ( 32 ). Exhaust system according to one of claims 1 to 5, characterized in that the exhaust system ( 30 ) only one catalyst ( 34 ), which in the exhaust pipe ( 32 ) is arranged and the exhaust gas of the internal combustion engine ( 14 ) is supplied. Exhaust system according to one of claims 1 to 6, characterized in that the exhaust pipes ( 42 . 44 ) Exhaust ports of different cylinder banks ( 26 . 28 ) of the internal combustion engine ( 14 ) assigned. Internal combustion engine for a motor vehicle, comprising a plurality of cylinders connected to an exhaust system ( 30 ) are connected according to one of claims 1 to 7, to remove exhaust gas from the cylinders. Internal combustion engine according to claim 8, characterized in that the internal combustion engine ( 14 ) a plurality of cylinder banks ( 26 . 28 ) and the exhaust pipes ( 42 . 44 ) of the exhaust system ( 30 ) with one of the cylinder banks ( 26 . 28 ) are connected.

Images