Exhaust-gas module for an internal combustion engine

Abstract

An exhaust-gas module A for an internal combustion engine, which exhaust-gas module has a base housing having a first side wall, at least one second side wall, an inlet for connection to the internal combustion engine and at least one outlet, wherein the inlet is arranged in the first side wall, and having multiple exhaust-gas purification components which are arranged in the base housing, wherein at least one SCR and/or one DOC are/is provided, wherein the at least one outlet is arranged in the second side wall and serves for the connection of an exhaust tailpipe of the internal combustion engine and/or alternatively for the coupling of an attachment housing, wherein the rest of the base housing, with the exception of the second side wall, is formed without outlets, wherein a connection contour with a circumferential contour U1 which has a basic shape G1 is provided for the connection of the attachment housing, wherein the connection contour delimits the second side wall at the edge, wherein at least one of the exhaust-gas purification components DPF, NH3, LNT, HOH is present in the base housing, and/or wherein at least one auxiliary component such as a mixer, an injector or a burner is present in the base housing.

Claims

1. An exhaust-gas module A for an internal combustion engine, comprising: a base housing having a first side wall, at least one second side wall, an inlet for connection to the internal combustion engine and at least one outlet, wherein the inlet is arranged in the first side wall, and having exhaust-gas purification components which are arranged in the base housing, wherein the exhaust-gas purification components include at least one SCR and/or one DOC, wherein the at least one outlet is arranged in the second side wall and serves for the connection of an exhaust tailpipe of the internal combustion engine or alternatively for the coupling of an attachment housing, wherein the rest of the base housing, with the exception of the second side wall, is formed without outlets, wherein a connection contour with a circumferential contour U1 which has a basic shape G1 is provided for the connection of the attachment housing, wherein the connection contour delimits the second side wall at an outer edge of the second side wall, wherein the exhaust-gas purification components further include at least one DPF, ammonia trapping catalyst, LNT or hydrolysis catalyst, and/or wherein at least one auxiliary component is comprised in the base housing, and wherein the second side wall encloses the exhaust-gas purification components such that the base housing has a closed module design.

2. The exhaust-gas module A according to claim 1, wherein the base housing with the side walls forms an integral housing wall, in which all exhaust-gas purification components and the at least one auxiliary component are contained.

3. The exhaust-gas module A according to claim 2, wherein an exhaust tailpipe of the internal combustion engine is connected to the outlet.

4. The exhaust-gas module A according to claim 1, wherein an exhaust tailpipe of the internal combustion engine is connected to the outlet.

5. An exhaust-gas after-treatment unit consisting of an exhaust-gas module A according to claim 1 and an exhaust-gas module B, comprising: an attachment housing having a first housing wall, at least one second housing wall, an outlet and an inlet for connection to a base housing, and comprising an end face with a fastening contour for connection to the base housing, wherein the inlet is placed at the end face and the outlet is arranged in the second housing wall and serves to connect an exhaust tailpipe of the internal combustion engine, wherein the fastening contour has a circumferential contour U2 with a basic shape G2, wherein the fastening contour at least partly delimits the first housing wall at an edge, and at least one acoustic component is contained in the attachment housing for reducing noise emission of an exhaust gas, wherein the attachment housing is free of exhaust-gas purification components which bring about a chemical after-treatment of the exhaust gas, wherein the outlet of the base housing can be coupled to the inlet of the attachment housing and the fastening contour can be connected to the connection contour, wherein the basic shape G1 and the basic shape G2 are identical or at least geometrically similar, and the second side wall of the exhaust-gas module A and the first housing wall of the exhaust-gas module B can be placed in proximity to each other, and wherein a diameter of the outlet of module A equals a diameter of the outlet of module B.

6. The exhaust-gas after-treatment unit according to claim 5, wherein a connection collar with a contour K geometrically similar to the basic shape G1, G2 is provided, which can be connected to the fastening contour and/or to the connection contour.

7. The exhaust-gas after-treatment unit according to claim 5, wherein exhaust-gas module A is connected to exhaust-gas module B, wherein the second side wall is designed in mirror symmetry with the outlet of the exhaust-gas module A and the second housing wall in mirror symmetry with the inlet of the exhaust-gas module B in regard to a parting plane E subtended between the second side wall and the second housing wall.

8. The exhaust-gas after-treatment unit according to claim 5, wherein exhaust-gas module A is connected to exhaust-gas module B, wherein the exhaust-gas module B is secured solely to the exhaust-gas module A and the exhaust-gas module A is fixed via support means to a motor vehicle, wherein the exhaust-gas module B is free of support means serving for a fastening to the motor vehicle.

9. The exhaust-gas module according to claim 1, wherein an exhaust tailpipe is provided, which is between 10 mm and 800 mm in length.

10. The exhaust-gas module according to claim 9, wherein the exhaust tailpipe is between 200 mm and 600 mm in length.

11. The exhaust-gas module according to claim 1, wherein an exhaust tailpipe is provided with cross section not rotationally symmetrical, having an effective flow cross section between 3850 mm.sup.2 and 17,680 mm.sup.2.

12. A system consisting of an exhaust-gas module according to claim 1, with an exhaust pipe system connected to the inlet of the base housing and/or a manifold for connection to a cylinder head of the internal combustion engine.

13. An exhaust-gas module B for an internal combustion engine, comprising: an attachment housing having a first housing wall, at least one second housing wall, an outlet and an inlet for connection to a base housing, and comprising an end face with a fastening contour for connection to the base housing, wherein the inlet is placed at the end face and the outlet is arranged in the second housing wall and serves to connect an exhaust tailpipe of the internal combustion engine, wherein the fastening contour has a circumferential contour U2 with a basic shape G2, wherein the fastening contour at least partly delimits the first housing wall at an outer edge of the first housing wall, and at least one acoustic component is contained in the attachment housing for reducing noise emission of an exhaust gas, wherein the attachment housing is free of exhaust-gas purification components which bring about a chemical after-treatment of the exhaust gas, wherein the end face encloses the at least one acoustic component such that the attachment housing has a closed module design.

14. The exhaust-gas module B according to claim 13, wherein a thermoelectric generator is contained in the attachment housing as an additional component.

15. The exhaust-gas module B according to claim 13, wherein at least one Helmholtz resonator and/or one Lambda/4 resonator and/or one reflection chamber and/or one exhaust flap are provided in the attachment housing as the at least one acoustic component.

16. The exhaust-gas module B according to claim 13, wherein the attachment housing with the housing walls forms an integral housing wall in which all acoustic components are contained.

17. The exhaust-gas module B according to claim 16, wherein the integral housing wall encompasses a volume between 1 liter and 200 liters.

18. An exhaust-gas module A for an internal combustion engine, comprising: a base housing having a first side wall, at least one second side wall, an inlet for connection to the internal combustion engine and at least one outlet, wherein the inlet is arranged in the first side wall, and having exhaust-gas purification components which are arranged in the base housing, wherein the exhaust-gas purification components include at least one SCR and/or one DOC, wherein the at least one outlet is arranged in the second side wall and serves for the connection of an exhaust tailpipe of the internal combustion engine or alternatively for the coupling of an attachment housing, wherein the rest of the base housing, with the exception of the second side wall, is formed without outlets, wherein a connection contour with a circumferential contour U1 which has a basic shape G1 is provided for the connection of the attachment housing, wherein the connection contour delimits the second side wall at an outer edge of the second side wall, wherein the exhaust-gas purification components further include at least one DPF, ammonia trapping catalyst, LNT or hydrolysis catalyst, and/or wherein at least one auxiliary component is comprised in the base housing, wherein the outlet is designed as a branch pipe, and wherein the second side wall encloses the exhaust-gas purification components such that the base housing has a closed module design.

19. The exhaust-gas module B according to claim 17, wherein the integral housing wall encompasses a volume between 50 liters and 80 liters.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Further benefits and details of the invention are explained in the patent claims and in the specification and represented in the Figures. There are shown:

(2) FIG. 1 a schematic of an exhaust system consisting of base housing and attachment housing in disassembled state of both housings;

(3) FIG. 2 a cross sectional representation of the respective housing;

(4) FIG. 3 the two housings in the assembled state;

(5) FIG. 4 a schematic of a motor vehicle with both exhaust-gas modules.

DETAILED DESCRIPTION OF THE INVENTION

(6) FIG. 1 shows two exhaust-gas modules A, B, which are designed in mirror symmetry in regard to a parting plane E with respect to their connection position of the outlet 1.2 and inlet 2.1, on the one hand, and with respect to a connection contour 1.3 or a fastening contour 2.3, on the other hand.

(7) The exhaust-gas module A comprises a base housing 1 with several outer walls, a circumferential first side wall 1.5, a second side wall 1.6 and an additional side wall 1.9. Within the second side wall 1.6, which is bounded by the connection contour 1.3, there is provided an outlet or exhaust-gas channel 1.2, from which the exhaust gas emerges from the module A. In departure from this, an inlet or inlet branch 1.1 is provided in the first side wall 1.5, through which exhaust gas is introduced from an internal combustion engine 9.1 per FIG. 4 into the exhaust-gas module A. The second side wall 1.6 is bounded by the connection contour 1.3, on which a connection collar 2.4 can be arranged, for example. A circumferential contour U1 of the second side wall 1.6 or the connection contour 1.3 in this sample embodiment has a substantially quadratic basic shape G1.

(8) The second exhaust-gas module B serves for the optional placement on or flanging to the exhaust-gas module A. The exhaust-gas module B comprises, in corresponding manner, an attachment housing 2 with several outer walls, a circumferential first housing wall 2.5 and at least one second housing wall 2.6 which can be placed opposite the attachment housing A. In the region of an end face 2.8 situated opposite the second housing wall 2.6 there is provided an inlet 2.1, which can be brought into a flow-through connection with the outlet 1.2 of the exhaust-gas module A when the two exhaust-gas modules A, B are assembled together. In the sample embodiment, the exhaust-gas module B is bounded at the end face 2.8 by an additional housing wall 2.7. But this is not absolutely essential, since the exhaust-gas module B is closed in the region of the end face 2.8 by the connected exhaust-gas module A.

(9) Both the base housing 1 with the side walls 1.5, 1.6, 1.9 and the attachment housing 2 with the housing walls 2.5, 2.6 form an integral housing wall 5.1, 5.2, in which all exhaust-gas purification components 3 and all acoustic components 4 are contained. Whereas in the case of the base housing 1 the integral housing wall 5.1 is also formed by the side wall 1.6, the attachment housing 2 can be designed with no housing wall in the region of the end face 2.8.

(10) The exhaust-gas module B likewise has a fastening contour 2.3 in corresponding manner, which likewise has a circumferential contour U2 with rectangular basic shape G2. Both exhaust-gas modules A, B can be brought to bear or connected mutually via the two connection or fastening contours 1.3, 2.3, so that the outlet 1.2 stands in a flow-through connection with the inlet 2.1. Thanks to the connection or fastening contours 1.3, 2.3, a connection is produced between the two exhaust-gas modules A, B. This can be done by direct welding of the two housings 1, 2 or, as shown in FIG. 3, by the use of a connection collar 2.4, joining the two modules A, B. The connection or fastening contours 1.3, 2.3 can also be designed as a support flange.

(11) The first side wall 1.5 and the first housing wall 2.5 need not be circumferential. Supplemental side walls or housing walls can also be provided.

(12) For purposes of fastening, the exhaust-gas after-treatment unit consisting of exhaust-gas module A with the attached exhaust-gas module B is secured via support means 1.7, 1.8, as shown in FIG. 3, to a motor vehicle 9 or a motor vehicle frame, not otherwise depicted. It is to be noted that only the exhaust-gas module A is fastened to the motor vehicle 9 via the support means 1.7, 1.8, while the exhaust-gas module B is fastened via the connection and fastening contour 1.3, 2.3 or the alternatively used connection collar 2.4 to the exhaust-gas module A. Ultimately, only just the exhaust tailpipe 8.1 is attached to the outlet 2.2 of the exhaust-gas module B. If the exhaust-gas after-treatment unit only consists of the exhaust-gas module A alone, this is likewise fastened via the support means 1.7, 1.8 to the motor vehicle. The exhaust tailpipe 8.1 is then attached to the outlet 1.2 of the exhaust-gas module A.

(13) As can be seen in FIG. 2, the exhaust-gas module A comprises several exhaust-gas purification components 3 such as a SCR 3.1, a DOC 3.2, a DPF 3.3, a NH3 3.4, a LNT 3.5 a HOH 3.6 and/or auxiliary components 3.7 for these, through which the exhaust gas flows, starting from the inlet 1.1, and leaving the exhaust gas housing A at the outlet 1.2.

(14) When the exhaust-gas module B is absent, the exhaust gas or the exhaust gas flow exits from the exhaust gas system with no further exhaust gas treatment. However, an exhaust tailpipe 8.1 not shown here should still be mounted at the outlet 1.2.

(15) When using the exhaust-gas module B, whose inlet 2.1 is connected to the outlet 2.2 of the exhaust-gas module A, the exhaust gas or the exhaust gas flow after exiting from the exhaust-gas module A moves through various acoustic after-treatment components 4, such as a reflection chamber 4.1, a Helmholtz resonator 4.2, a Lambda/4 resonator 4.3 and/or an exhaust flap 4.4, all of which are arranged in the exhaust-gas module B. Alternatively and/or in addition to this, a thermoelectric generator 6 or a thermodynamic unit 7 can also be arranged in the exhaust-gas module B. The exhaust-gas purification components 3 are placed exclusively in the exhaust-gas module A, while the acoustic components 4 not having any active chemical cleaning action are arranged in the exhaust-gas module B. The exhaust-gas module B is connected to the exhaust-gas module A via the connection collar 2.4 shown in FIG. 2 with the contour K, which corresponds to the basic shape G1 or G2, and thus also to the circumferential contour U1, U2.

(16) FIG. 4 shows the exhaust-gas after-treatment unit integrated in a vehicle 9 with an internal combustion engine 9.1 and with a cylinder head 9.3, to which a manifold 9.2 is attached with an exhaust pipe system 8 connected to it. The two exhaust-gas modules A, B are integrated in the exhaust pipe system 8, which discharge the exhaust gas through the exhaust tailpipe 8.1.

LIST OF REFERENCE SYMBOLS

(17) 1 Base housing 1.1 Inlet, inlet branch 1.2 Outlet, exhaust-gas channel 1.3 Connection contour, support flange 1.5 First side wall 1.6 Second side wall 1.7 Support means 1.8 Support means 1.9 Additional side wall 2 Attachment housing 2.1 Inlet 2.2 Outlet 2.3 Fastening contour 2.4 Connection collar 2.5 First housing wall 2.6 Second housing wall 2.7 Additional housing wall 2.8 End face 3 Exhaust-gas purification component 3.1 SCR 3.2 DOC 3.3 DPF 3.4 NH3 3.5 LNT 3.6 HOH 3.7 Auxiliary component 4 Acoustic Component 4.1 Reflection chamber 4.2 Helm holtz resonator 4.3 Lambda/4 resonator 4.4 Exhaust flap 5.1 Housing wall 5.2 Housing wall 6 Thermoelectric generator 7 Thermodynamic unit 8 Exhaust pipe system 8.1 Exhaust tailpipe 9 Motor vehicle 9.1 Internal combustion engine 9.2 Manifold 9.3 Cylinder head A Exhaust-gas module B Exhaust-gas module E Plane, mirror plane G1 Basic shape of 1.3 G2 Basic shape of 2.3 K Contour U1 Circumferential contour of 1.3 U2 Circumferential contour of 2