KR20240086578A - Exhaust gas purification device of an internal combustion engine - Google Patents

Abstract

Disclosed is an exhaust gas purification device (10) for an internal combustion engine, the exhaust gas purification device (10) having an exhaust pipe (11), the exhaust pipe (11) being adjacent to each other in at least one cylinder bank of the internal combustion engine. The longitudinal direction of the exhaust pipe extends along the arranged cylinders, and has a catalytic converter (15) disposed within the exhaust pipe (11), wherein the catalytic converter (15) connects the exhaust pipe (11) to a first exhaust pipe portion (16). ) and a second exhaust pipe portion 17, wherein the exhaust pipe portions 16 and 17 each extend in their longitudinal direction along the cylinders of the at least one cylinder bank, and the exhaust pipe 11 includes the at least one cylinder bank. coupled to the cylinders of said at least one cylinder bank to introduce exhaust gases from the cylinders of said cylinder bank into the first exhaust pipe portion (16) of said exhaust pipe (11), wherein the unpurified exhaust gases are connected to said exhaust pipe (11). ), is guided transversely in the longitudinal direction of the exhaust pipe 11 through the catalytic converter 15 into the second exhaust pipe section 17 of the exhaust pipe 11, As purified exhaust gases it can exit from the second exhaust pipe section 17 of the exhaust pipe 11 and be directed towards at least one other assembly of the internal combustion engine.

Description

EXHAUST GAS PURIFICATION DEVICE OF AN INTERNAL COMBUSTION ENGINE}

The present invention relates to an exhaust gas purification device for an internal combustion engine.

Internal combustion engines known from the art include cylinders in which fuel is burned. The cylinders of an internal combustion engine are arranged in a row adjacent to each other to form at least one cylinder bank. In the case of an internal combustion engine with a V-shaped structure, two cylinder banks are provided, and in each cylinder bank, a plurality of cylinders are arranged adjacent to each other. Additionally, internal combustion engines known from the art include exhaust gas purification devices. The exhaust gas purification device serves to purify the exhaust gases leaving the cylinders. Typically, at least one turbine of the corresponding exhaust gas turbocharger is arranged downstream of the exhaust gas purification device.

In internal combustion engines known from the art, exhaust gas purification devices require a lot of installation space. This is a disadvantage.

There is a need for an exhaust gas purification system that can preferably be installed within the existing dimensions (installation space) of the engine and thus does not require any additional space in the vicinity of the engine and, moreover, has a lightweight structure.

The object of the present invention is to provide a corresponding exhaust gas purification device for an internal combustion engine.

This object is solved through an exhaust gas purification device for an internal combustion engine according to claim 1.

The exhaust gas purification device according to the present invention includes an exhaust pipe, the exhaust pipe extending in the longitudinal direction along the cylinders of at least one cylinder bank of an internal combustion engine arranged adjacent to each other. In addition, the exhaust gas purification device according to the present invention includes a catalytic converter disposed inside the exhaust pipe and dividing the exhaust pipe into a first exhaust pipe portion and a second exhaust pipe portion, each of the exhaust pipe portions having a longitudinal direction corresponding to at least one cylinder bank. extends along the cylinder of The exhaust pipe is coupled to the cylinders of at least one cylinder bank in such a way as to introduce exhaust gases from the cylinders of the at least one cylinder bank into the first exhaust pipe portion of the exhaust pipe. The unpurified exhaust gases are guided starting from the first exhaust pipe portion of the exhaust pipe, transversely in the longitudinal direction of the exhaust pipe, through the catalytic converter, into the second exhaust pipe portion of the exhaust pipe, and are discharged as purified exhaust gases from the second exhaust pipe portion of the exhaust pipe. and may be guided in the direction of at least one other assembly of an internal combustion engine.

In the exhaust gas purification device according to the invention, the exhaust pipe extends along the cylinders of at least one cylinder bank. In this exhaust pipe, a catalytic converter is accommodated, which divides the exhaust pipe into a first exhaust pipe section for unpurified exhaust gases and a second exhaust pipe section for purified exhaust gases. In the case of one cylinder bank or two cylinder banks, a single exhaust pipe is provided in which a catalytic converter is arranged to receive, purify and discharge exhaust gases leaving the cylinder in the direction of at least one other assembly of the internal combustion engine. The two exhaust pipe sections of the exhaust pipe, which are separated from each other by the catalytic converter, extend in their longitudinal direction along the cylinders of the corresponding cylinder bank. The catalytic converter accommodated in the exhaust pipe causes exhaust gas to flow horizontally in the longitudinal direction of the exhaust pipe. The exhaust gas purification device according to the invention requires a small installation space and can be integrated into the engine compartment. Additionally, the exhaust gas purification device according to the present invention has low weight.

Preferably, the exhaust pipe has two exhaust pipe portions extending along all cylinders of a single cylinder bank or two cylinder banks, and a first exhaust pipe portion of the exhaust pipe is coupled to all cylinders of one cylinder bank or two cylinder banks. do. This embodiment is particularly advantageous for providing an exhaust gas purification device with low weight and small installation space requirements. Alternatively, according to the invention, a plurality of exhaust gas purification devices can be installed on an internal combustion engine, preferably with two cylinder banks, for example one exhaust gas purification device per cylinder bank. Can be installed.

Preferably, the exhaust gas purification device allows exhaust gases to be directed directly and in an unpurified state from the first exhaust pipe portion in the direction of at least one other assembly of the internal combustion engine in the exhaust pipe, bypassing the catalytic converter. It includes at least one bypass unit. In particular, the bypass portion is formed at an end of the exhaust pipe which allows exhaust gases coming from the exhaust pipe to be directed in the direction of at least one other assembly of the internal combustion engine. In particular, the bypass section can be blocked and opened via a controllable closing device. By means of the bypass section and the controllable closing device that serves to block and open this bypass section, the control of the flow of exhaust gases can be reliably matched to the different operating points and load changes of the internal combustion engine. Thereby, the engine dynamics of an internal combustion engine including an exhaust gas purification device can be adjusted or improved.

Preferably, flow guiding elements that guide the flow of exhaust gases of the cylinders of the cylinder bank when entering the first exhaust pipe portion of the exhaust pipe are arranged in the coupling area of the exhaust pipe and the cylinders of the cylinder bank. By means of flow guiding elements, the introduction of exhaust gases from the cylinders into the first exhaust section of the exhaust pipe, and the distribution of the exhaust gases in the first exhaust section, can be improved to provide a good flow through the catalytic converter.

Preferably, the catalytic converter in question is assigned at least one preferably lattice-like guide element. By means of the guide elements, the control of the flow of exhaust gases in the area of the catalytic converter can be improved.

Other advantageous improvements of the invention result from the dependent claims and the detailed description below. Preferred embodiments of the present invention will be described in more detail with reference to the drawings without being limited thereto.
1 is a perspective view of one embodiment of an exhaust gas purification device for an internal combustion engine.
FIG. 2 is a first cross-sectional view through the exhaust gas purification device of FIG. 1.
Figure 3 is a second cross-sectional view of a portion through the exhaust gas purification device of Figure 1;
Figure 4 is a detailed view of Figure 2.
Figure 5 shows an alternative to the detail of Figure 3.
Figure 6 shows the detail of Figure 3 in a first state.
Figure 7 shows the detail of Figure 6 in a second state.
Figure 8 shows the detail of Figure 6 in a third state.
Figure 9 is a third cross-sectional view of a portion through the exhaust gas purification device of Figure 1;
Figure 10 shows an alternative to the detail of Figure 6 in a first state.
Figure 11 shows the detail of Figure 10 in a second state.

Figure 1 shows a perspective view of an exhaust gas purification device 10 for an internal combustion engine. The exhaust gas purification device 10 in Figure 1 is shown for an internal combustion engine with two cylinder banks.

Each cylinder bank contains 10 cylinders arranged in a row. The number of cylinders per cylinder bank to which the exhaust gas purification device 10 in FIG. 1 will be applied is merely exemplary.

The exhaust gas purification device 10 of FIG. 1 according to the present invention includes an exhaust pipe 11. This exhaust pipe 11 extends in its longitudinal direction along cylinders arranged adjacent to each other in one or more cylinder banks of an internal combustion engine.

In the exemplary embodiment of FIG. 1 , the exhaust pipe 11 is assembled from a plurality of pipe segments 11a, in each case arranged adjacent to each other, the pipe segments 11a being length compensation elements, examples herein They are connected to each other by a bellows-like compensator (12). Compensator 12 serves, for example, to compensate for thermally induced length changes.

The exhaust pipe (11) is closed at the first end (13). At the opposite second end 14 , exhaust gases can be discharged from the exhaust pipe 11 in the direction of at least one other assembly of the internal combustion engine, for example in the direction of a turbine of an exhaust gas turbocharger.

Within the exhaust pipe 11, a plurality of catalytic converters 15 are disposed. Figure 2 shows a longitudinal section taken through the exhaust gas purification device 10 of Figure 2, showing a plurality of such catalytic converters 15, which divide the interior of the exhaust pipe 11. And, accordingly, the exhaust pipe 11 is divided into a first exhaust pipe portion 16 and a second exhaust pipe portion 17. The exhaust pipe parts 16, 17 of the exhaust pipe 11 extend in their longitudinal direction parallel to each other along the cylinders of the two cylinder banks.

The exhaust pipe 11 is coupled to the cylinders of the cylinder bank, ie from each cylinder of the cylinder bank, in such a way that exhaust gases can be introduced into the first exhaust pipe portion 16 of the corresponding exhaust pipe 11 . Accordingly, in the exemplary embodiment of FIGS. 1 and 2 each exhaust pipe segment 11a is provided to interact with two cylinders of each of two cylinder banks. And, each exhaust pipe segment 11a respectively forms an inlet opening 18 for such four cylinders, and exhaust gas flows from each cylinder of the corresponding cylinder bank through each inlet opening 18 to the exhaust pipe 11. ), that is, it can be introduced into the first exhaust pipe portion 16 of the corresponding exhaust pipe 11. If there is only one cylinder bank, the exhaust pipe 11 is coupled via the inlet opening 18 to the cylinders of that one cylinder bank. Inlet openings that are not needed then result in a saving of components.

The unpurified exhaust gas starts from the first exhaust pipe portion 16 of the exhaust pipe 11 and passes through the catalytic converter 15 transversely in the longitudinal direction of the exhaust pipe 11, i.e. through the second exhaust pipe portion 17. direction, and the purified exhaust gas can accumulate in the second exhaust pipe portion 17. The purified exhaust gases can exit from the second exhaust pipe section 17 of the exhaust pipe 11 , ie from the second end 14 of the exhaust pipe 11 and be directed in the direction of at least one further assembly of the internal combustion engine. Additionally, the first end 13 may be implemented similarly to the end 14 so that exhaust gas can be supplied to another assembly through the first end 13.

The exhaust pipe 11 consists of two exhaust pipe sections 16, 17 extending along all the cylinders of one cylinder bank or two cylinder banks, or one exhaust pipe 11 or a plurality of exhaust pipes along one cylinder bank ( 11) is extended. The first exhaust pipe portion 16 of the exhaust pipe 11 is coupled to all cylinders of one cylinder bank or two cylinder banks, i.e. via an inlet opening 18, through which the cylinders are fed. Exhaust gases may flow into the first exhaust pipe portion 16 of the exhaust pipe 11 . The exhaust gases entering the first exhaust pipe section 16 through the inlet opening 18 of the pipe segment 11a of the exhaust pipe 11 diffuse within the first exhaust pipe section 16 and flow through the catalytic converter, It accumulates as purified exhaust gas in the second exhaust pipe section 17 in the direction from the second exhaust pipe section 17 to the second end 14 and, if the first end 13 is likewise implemented, to the first end ( It is guided in the direction of 13) and sent to at least one other assembly of the internal combustion engine.

The exhaust gas purification device 10 includes a bypass unit 19. A bypass section 19 is formed at the second end 14 of the exhaust pipe through which exhaust gases are guided in the direction of at least one other assembly of the internal combustion engine. Additionally, an additional bypass portion is additionally attached to the other end, allowing exhaust gases to be extracted for other assemblies also from the first end.

The bypass section 19 is formed for directing the exhaust gases in an unpurified state directly from the first exhaust pipe section 16, bypassing the catalytic converter 15, in the direction of at least one other assembly of the internal combustion engine. . A controllable closing device 20 is assigned to the bypass section 19 .

6, 7 and 8 show such closure device 20 in various states, where in the state of FIG. 6 the closure device 20 completely blocks the bypass section 19, and in FIG. 7 it is in a bypass state. The closure device 20 partially opens the bypass section 19 in FIG. 8 .

In the state of Figure 6, the exhaust gases are not allowed to flow through the bypass section 19, but all the exhaust gases come from the second exhaust pipe portion 17 and are discharged from the exhaust pipe 10, i.e. at least one exhaust gas of the internal combustion engine. It must flow from the first exhaust section 16 through the catalytic converter 15 to be discharged in the direction of other assemblies. In the situation in FIG. 7 , all exhaust gases can come out of the first exhaust pipe section 16 and be directed directly towards at least one other assembly of the internal combustion engine. Therefore, in the state of FIG. 7, exhaust gas does not flow through the catalytic converter 15. In the state of FIG. 8 , the exhaust gases pass partly through the catalytic converter 15 on the one hand, such that they are supplied to at least one other assembly of the internal combustion engine as partly purified exhaust gases and partly as unpurified exhaust gases. , on the other hand, may partially bypass the catalytic converter 15 and flow through the bypass section 19.

The closure device 20 is configured to adjust the exhaust gas control at the operating point or load point of the internal combustion engine including the exhaust gas purification device, via the actuator 21 of FIGS. 6, 7 and 8. Can be moved between states.

The closing device 20 shown in FIGS. 6 , 7 and 8 is designed as a flap that can be pivoted about an axis 21 , which is connected to one of the catalytic converters 15 , i.e. It faces the catalytic converter 15 located directly in the area of the second end 14 . Additionally, the closure device shown in FIGS. 6 , 7 and 8 can also be arranged at the first end 13 .

10 and 11 also show an alternative embodiment of the closure device 20 , which can be pivoted about an axis 21 , which is located in the area of the end 14 of the exhaust pipe 11 It is provided at the end of the closure device (20) away from the catalytic converter (15) arranged in.

In the state of FIG. 10 , the closing device 20 completely closes the bypass section 19 , while in FIG. 11 the closing device 20 completely opens the bypass section 19 . Accordingly, the state in Figure 10 corresponds to the state in Figure 6, and the state in Figure 11 corresponds to the state in Figure 7.

According to a further advantageous development of the invention, it is provided that each catalytic converter 15 is assigned at least one guide element 22 for exhaust gas control. Accordingly, Figure 5 shows that each catalytic converter 15 has both an inlet end as well as an outlet end, i.e. the end assigned to the first exhaust pipe section 16 and the end assigned to the second exhaust pipe section 17. It shows that the guide elements 22 for exhaust gas control are respectively allocated. This guide element 22 according to FIG. 5 controls the flow of exhaust gases in the area of the catalytic converter, i.e. the inlet flow of the catalytic converter 15 from the first exhaust pipe section 16 and the second exhaust pipe from the catalytic converters. In order to improve the outflow into the part 17, it is implemented as a grid-like guide element.

As can be best seen from FIG. 9 , a flow guiding element 23 is formed in the area of the coupling of the exhaust pipe 11 with the cylinders, i.e. adjacent to each inlet opening 18 of the exhaust pipe 11 , the flow guiding element 23 being formed therein. The element 23 serves to control the flow of exhaust gases flowing from the corresponding cylinder through the corresponding inlet opening 18 into the first exhaust pipe section 16 of the exhaust pipe 11. Accordingly, the exhaust gases from the cylinders flow through the inlet opening 18 into the first exhaust pipe section 16 before the exhaust gases flow through the catalytic converter 15 in the direction of the second exhaust pipe section 17. 1 It is ensured that it spreads evenly within the area of the exhaust pipe section 16. Accordingly, flow through the catalytic converter 15 and ultimately exhaust purification can be improved.

10: Exhaust gas purification device
11: exhaust pipe
11a: pipe segment
12: Compensator
13: end
14: end
15: Catalytic converter
16: Exhaust pipe part
17: Exhaust pipe part
18: inlet opening
19: Bypass unit
20: closure device
21: axis
22: Guide element
23: Flow guidance element

Claims (9)

As an exhaust gas purification device (10) for an internal combustion engine,
an exhaust pipe (11), the exhaust pipe (11) extending in the longitudinal direction along cylinders arranged adjacent to each other of at least one cylinder bank of the internal combustion engine; and
A catalytic converter (15) disposed within the exhaust pipe (11), wherein the catalytic converter (15) divides the exhaust pipe (11) into a first exhaust pipe portion (16) and a second exhaust pipe portion (17), (16, 17) each extending in its longitudinal direction along the cylinders of said at least one cylinder bank.
wherein the exhaust pipe (11) is connected to the cylinders of the at least one cylinder bank to introduce exhaust gases from the cylinders of the at least one cylinder bank into the first exhaust pipe portion (16) of the exhaust pipe (11). Coupled,
The unpurified exhaust gas starts from the first exhaust pipe portion 16 of the exhaust pipe 11, passes through the catalytic converter 15 transversely in the longitudinal direction of the exhaust pipe 11, and passes through the first exhaust pipe portion 16 of the exhaust pipe 11. 2 exhaust pipe section (17), wherein the purified exhaust gases can exit the second exhaust pipe section (17) of the exhaust pipe (11) and be directed in the direction of at least one other assembly of the internal combustion engine. Gas purification device. According to paragraph 1,
The exhaust pipe (11) has two exhaust pipe portions (16, 17) extending along all cylinders of a single cylinder bank or two cylinder banks, and the first exhaust pipe portion (16) of the exhaust pipe (11) has the An exhaust gas purification device, characterized in that it is coupled to one cylinder bank or all cylinders of said two cylinder banks. According to claim 1 or 2,
It further comprises at least one bypass section (19), through which the exhaust gases bypass the catalytic converter (15) and are directed to the at least one other assembly of the internal combustion engine. 1 An exhaust gas purification device, characterized in that it can be guided in an unpurified state directly from the exhaust pipe section (16). According to paragraph 3,
The exhaust gas purification device is characterized in that the bypass portion (19) is formed at the end (14) of the exhaust pipe (11). According to clause 4,
The bypass portion 19 is formed at the ends 13, 14 of the exhaust pipe 11, allowing exhaust gases to come out of the exhaust pipe 11 and be guided in the direction of at least one other assembly of the internal combustion engine. An exhaust gas purification device, characterized in that According to clause 4 or 5,
Characterized in that it further comprises a controllable closing device (20) assigned to the bypass section (19) and provided to block and open the bypass section (19). According to clause 6,
A bypass purification device, characterized in that the closing device (20) is configured to completely block, completely open, and partially block and open the bypass section (19). According to any one of claims 1 to 7,
Exhaust gas purification device, characterized in that each catalytic converter (15) is assigned at least one preferably grid-shaped guide element (22). According to any one of claims 1 to 8,
A flow control element (23) is disposed in the area of the coupling of the exhaust pipe (11) with the cylinders of each cylinder bank, wherein the flow control element (23) when entering the first exhaust pipe section (16) of the exhaust pipe (11) An exhaust gas purification device, characterized in that it controls the flow of exhaust gas in the cylinders of the corresponding cylinder bank.

Images