Exhaust system of an internal combustion engine of a motor vehicle

Abstract

Exhaust system(1) of an internal combustion engine of a motor vehicle • with at least one exhaust pipe (2) which carries exhaust gas from the internal combustion engine to the environment of the motor vehicle, • with at least one pressure tap pipe (4) which is pressurised to the exhaust pipe (2), wherein a condensate separator (5) is provided for collecting condensate dripping from the pressure tap pipe (4) into the exhaust pipe (2), the condensate separator (5) comprises a collection container (6) which is arranged below an outlet area of ​​the pressure tap pipe (4) in the exhaust pipe (2), and the condensate separator (5) has a nozzle (7) connected to the collection container (6) with a flange (21) for fixing the condensate separator (5) in an opening of the exhaust pipe (2), and the nozzle (7) has a recess (17) for receiving the pressure tap pipe (4), wherein the pressure tap pipe (4) is pressurised to the nozzle (7) of the condensate separator (5), characterized in that the nozzle (7) has a surrounding recess (17). threaded section (18) haswherein the pressure tap tube (4) arranged in the recess (17) is connected pressure-tight to the nozzle (7) of the condensate separator (5) by means of a cutting ring (19) and a union nut (20) screwed onto the threaded section (18).

Description

[0001] The invention relates to an exhaust system for an internal combustion engine of a motor vehicle, comprising at least one exhaust pipe that carries exhaust gas from the engine to the vehicle's surroundings and at least one pressure tap pipe that is pressurized to the exhaust pipe. A condensate separator is provided for collecting condensate dripping from the pressure tap pipe into the exhaust pipe. The condensate separator includes a collection container located below the outlet of the pressure tap pipe in the exhaust pipe, and a nozzle connected to the collection container with a flange for fixing the condensate separator in an opening of the exhaust pipe. The nozzle has a recess for receiving the pressure tap pipe, which is pressure-tightly connected to the nozzle of the condensate separator.

[0002] From DE 10 2010 035 705 A1, an exhaust system for an internal combustion engine of a motor vehicle is already known, in which at least one pressure tap pipe is connected to an exhaust pipe. In this system, a pressure tap pipe is connected to the exhaust pipe and to a pressure sensor for determining the differential pressure both upstream and downstream of a particulate filter, in the direction of exhaust gas flow.

[0003] During operation of the vehicle or internal combustion engine, exhaust gas condensate can form in the pressure tap pipe, which drips into the exhaust pipe and is carried downstream by the exhaust flow. For this reason, such pressure tap pipes are typically connected to the exhaust pipe downstream of heated ceramic exhaust gas sensors, such as particle or NOx sensors or lambda sensors. This prevents contact and subsequent damage to the heated ceramic components of the exhaust gas sensors by the entrained condensate droplets.

[0004] However, positioning the pressure tap pipe downstream of the exhaust gas sensors and the required arrangement of decoupling elements that connect the exhaust system to the vehicle sometimes result in long pipe and hose lengths for the pressure tap pipes.

[0005] From DE 10 2013 214 564 A1 it is already known to protect a sensor element of an exhaust gas sensor arranged in the exhaust pipe by a protective tube consisting of an inner tube and an outer tube, wherein the protective tube prevents the ingress of exhaust gas condensate formed or carried along in the exhaust gas and thus prevents contact of the sensor element with the exhaust gas condensate.

[0006] Furthermore, DE 10 2013 010 015 A1 discloses a pressure sensor which is arranged in an exhaust pipe and has a piezoelectric OFW sensor element (surface wave sensor element). Due to the use of suitable piezoelectric material, the sensor element is insensitive to moisture and exhaust gas condensate.

[0007] US Patent 3,143,130 A describes a condensate trap for high-pressure steam systems, specifically designed to protect a pressure measuring instrument (e.g., a manometer or pressure sensor) from superheated steam. The trap consists of a short stainless steel housing with two telescoping tubes that create a coiled flow path for the steam. Condensation of the steam within this structure prevents the direct flow of superheated steam into the connected measuring instrument. The design also allows for easy disassembly for cleaning or maintenance.

[0008] GB 2 535 623 A further details a pressure measuring device for detecting gas pressure at a pressure tap, particularly in a gas turbine engine. The device comprises a pressure sensor that generates a pressure measurement signal and a gas line connecting the sensor to the pressure tap. A condenser is located on the gas line and has condensation surfaces on which moisture from the gas stream condenses. The temperature at the condenser is lower than at the pressure tap, thus reducing the moisture content of the gas before it enters the sensor. An optional condensate separator may be included to drain the condensed water. The pressure sensor may be heated to further reduce the moisture content.

[0009] Furthermore, US Patent 2012 / 0073381A1 describes a pressure sensor package comprising a pressure sensor chip in a housing with a cover and a pressure inlet tube. Inside the pressure inlet tube, a groove is provided along the wall surface of the bore. This groove can extend from the tube's inlet opening to near the pressure sensor chip and can have various cross-sectional shapes (e.g., U-, V-, or triangular). The groove serves to drain condensate droplets along the tube wall via capillary action. The housing with the groove is manufactured using a special shaping process during injection molding.

[0010] From DE 10 2014 019 641 A1, an exhaust system for an internal combustion engine is further disclosed. It comprises an exhaust gas cleaning device, an exhaust gas pipe with an exhaust gas sensor arranged downstream of the exhaust gas cleaning device, and an exhaust gas recirculation pipe that connects to the exhaust gas pipe at a terminal point. A shield is provided between the exhaust gas sensor and the terminal point to prevent the exhaust gas recirculation from affecting the sensor. The shield can be designed as a shielding plate in the form of a perforated or solid sheet and can divide the exhaust gas pipe into two flow zones.

[0011] Furthermore, DE 10 2017 109 626 A1 discloses an exhaust system for internal combustion engines in which a differential pressure line connects sections of the exhaust duct upstream and / or downstream of a particulate filter to a differential pressure sensor, and a reservoir projecting into the exhaust duct is arranged at the end of the differential pressure line facing the exhaust duct. The reservoir serves to collect condensate formed in the differential pressure line and is heated by the flowing exhaust gas, so that the collected liquid evaporates before exiting the exhaust duct and is introduced as vapor. To establish the fluidic connection and to prevent droplet formation, openings or slots are provided on the reservoir, arranged in such a way that liquid does not drip uncontrollably into the exhaust duct.Furthermore, the publication describes embodiments of the reservoir as a sheet metal part with a tear-off edge, possible fastening options on the exhaust duct or on the differential pressure line, as well as the positioning of a NOx sensor downstream of the particulate filter and associated installation distances.

[0012] Against this background, the invention is based on the objective of designing an exhaust system of an internal combustion engine of a motor vehicle in such a way that the positioning of an exhaust gas sensor in the exhaust pipe is possible independently of the positioning of a pressure tap pipe and thereby prevents damage or destruction of the sensor element of the exhaust gas sensor by exhaust gas condensate.

[0013] This problem is solved with an exhaust system according to the features of claim 1. The dependent claims relate to particularly advantageous further developments of the invention.

[0014] According to the invention, an exhaust system for an internal combustion engine of a motor vehicle is provided, which includes a condensate separator for collecting condensate dripping from the pressure tap pipe into the exhaust pipe. The condensate separator prevents condensate droplets from being carried downstream by the exhaust flow. This minimizes the risk of damage or destruction to exhaust gas sensors located downstream of the pressure tap pipes by exhaust gas condensate. This ensures that a usable signal from the pressure sensor is available at all times. The position of the exhaust gas sensors can be independent of the position of the pressure tap pipes and can therefore be chosen more freely according to their respective requirements. The use of the condensate separator also makes it possible to position the pressure tap pipe directly downstream of the particulate filter.This allows for a reduction in the length of the pressure tap pipe, saving installation space. The reduced pipe / hose lengths mean fewer mounting points are required, thus lowering material costs and manufacturing time. The condensate separator can be used with both gasoline and diesel engines. Possible installation positions for the condensate separator and its associated pressure tap pipe are downstream of the catalytic converter, particulate filter, SCR catalyst, or NOx storage catalyst, within pipes and funnels.

[0015] Furthermore, according to the invention, the condensate separator comprises a collection container which is arranged below the outlet of the pressure tap pipe in the exhaust pipe. Condensate forming in the pressure tap pipe drips by gravity into the collection container located in the exhaust pipe and is collected there. The hot exhaust gas heats the collection container, and the collected condensate is quickly heated and evaporates. The condensate droplets dripping from the pressure tap pipe during operation of the internal combustion engine are then vaporized or atomized upon contact with the heated wall surfaces of the collection container.

[0016] A further feature that enhances the invention is characterized by the fact that the collection container has at least one opening connecting the interior of the container and the interior of the exhaust pipe. This creates a pressure connection, which is essential for pressure measurement. Furthermore, the opening allows the evaporated or atomized condensate to escape from the collection container and be released into the vehicle's environment along with the exhaust gas flow. Due to the evaporation or atomization, there is no risk of damage to exhaust gas sensors located downstream of the condensate separator.

[0017] The aforementioned effects are further enhanced by the fact that the collection container has several openings evenly distributed around its circumference. This allows the exhaust gas flow to enter and exit the interior of the container, and also enables the evaporated or atomized condensate to be drained away.

[0018] A further advantageous embodiment of the invention is achieved by having a tubular collection container with a closed bottom tray, wherein the at least one opening is arranged in a wall section of the collection container facing away from the bottom tray. The bottom tray forms a contact surface for the condensate and, once a certain temperature is reached, ensures that the condensate droplets evaporate or atomize. If the bottom tray does not reach the temperature required for evaporation or atomization, it forms a collection space for the condensate dripping into the collection container. This is particularly the case when the bottom tray cools down slowly after the internal combustion engine is switched off, or when the bottom tray has not yet reached the predetermined temperature after the internal combustion engine has been started.

[0019] According to the invention, simple and reliable assembly and fixing of the collection container in the exhaust pipe is achieved by the condensate separator having a nozzle connected to the collection container with a flange for fixing the condensate separator in an opening of the exhaust pipe. The collection container is welded to a mounting section, the nozzle, and the nozzle in the area of ​​the flange to an edge section of the exhaust pipe that defines the opening.

[0020] The connection of the pressure tap pipe to the exhaust pipe is preferably made via the condensate separator. According to the invention, the condensate separator's nozzle has a recess for receiving the pressure tap pipe, and the pressure tap pipe is connected to the condensate separator's nozzle in a pressure-tight manner. The nozzle, according to the invention, has a threaded section surrounding the recess, and the pressure tap pipe, located in the recess, is connected to the condensate separator's nozzle in a pressure-tight manner by means of a cutting ring and a union nut screwed onto the threaded section. Such a cutting ring connection provides a simple and pressure-tight connection between the exhaust pipe and the pressure tap pipe via the condensate separator, and the cutting ring connection allows for axial tolerance compensation.

[0021] A further feature clarifying an embodiment of the invention is that the nozzle comprises a pipe section arranged coaxially to the pressure tap pipe, wherein the pipe section and the pressure tap pipe have an identical inner diameter. The pipe section, open at both ends, forms an extension of the pressure tap pipe, which is connected to the nozzle in a pressure-tight manner. This ensures that an end section of the pipe section has a defined position and arrangement relative to the wall surfaces or the bottom of the collection container, independent of axial tolerances of the pressure tap pipe.

[0022] It proves advantageous for the pipe section to have a shorter axial extent than the collection tank, creating a space between the bottom of the tank and one of the pipe section's end sections facing the tank. This ensures that a predetermined volume of exhaust gas condensate can be collected in the bottom of the tank, such that the liquid level of the condensate remains below the end of the pipe section. When the end of the pipe section is below the liquid level, there is no pressure connection between the tank interior or the exhaust pipe and the pressure tap pipe, and therefore no usable signal from the pressure sensor can be provided.

[0023] In the event that the liquid level of the condensate volume collected in the base tray reaches the end of the pipe section, or that the pipe section is blocked by ice in winter temperatures, at least one wall surface of the pipe section facing away from the base tray is provided with a perforation. This ensures a pressure connection between the interior of the tank or the exhaust pipe and the pressure tap pipe even if the end of the pipe section is blocked, and allows a usable signal from the pressure sensor to be provided.

[0024] In this context, it proves particularly advantageous that the wall surface of the pipe section has several perforations, which are evenly distributed around the circumference of the pipe section.

[0025] In one embodiment of the invention, a sleeve with at least one outwardly directed projection is fixed to the pipe section of the nozzle, wherein a fastening area of ​​the sleeve and the projection form an obtuse angle, and the projection forms a circumferential guide surface for condensate inclined towards the at least one opening. This directs condensate forming in the pressure tap pipe, which flows along the openings in the wall surface of the pipe section and exits from them, back towards the openings and flows through them into the interior of the pipe section. In the fastening area, the sleeve is fixed to the pipe section of the nozzle by a material-locking or form-fit connection.

[0026] A further embodiment of the invention provides that the sleeve has a second outwardly directed projection in a section facing the base tray, wherein the mounting area of ​​the sleeve and the second projection also form an obtuse angle. This second projection forms an impact surface for condensate droplets, which are catapulted away from the base tray of the collection container at very high temperatures.

[0027] In this case, it also proves advantageous to arrange a woven insert in the space between the bottom tray and the end section of the pipe facing the bottom tray. This folded wire mesh or knitted wire fabric, preferably made of stainless steel, is constructed similarly to a catalyst insert and forms a large impact surface, so that the condensate droplets are atomized or evaporated even at very high temperatures in the bottom tray.

[0028] A further advantageous feature of the invention is that a guide element is arranged on an inner surface of the collection container such that the fabric insert is fixed between the guide element and the base tray. This ensures a defined positioning of the insert within the base tray.

[0029] Furthermore, a slit-shaped opening is provided between an inwardly inclined end section of the guide element and the pipe section of the nozzle. The inwardly inclined section acts as an impact surface for accelerated condensate droplets, and the slit-shaped opening ensures that the evaporated or atomized condensate is discharged towards the perforations in the wall surface of the collection container.

[0030] Furthermore, it proves advantageous for the condensate separator to be positioned in the exhaust pipe such that its central axis forms an angle between 30° and 90° with respect to a horizontal plane defined by the vehicle's longitudinal axis (x-axis) and transverse axis (y-axis). At an angle of up to 30°, it is ensured that the liquid level of any condensate volume contained in the collection tank remains below the openings in the tank's wall, preventing condensate from escaping through these openings. At an installation angle of 90°, the collection tank has a maximum capacity, and at 30°, a minimum capacity.

[0031] A condensate separator for the exhaust system of a motor vehicle exhibits at least some of the aforementioned characteristics.

[0032] The invention allows for numerous embodiments. To further illustrate its basic principle, one of these is shown in the drawing and described below.

[0033] This shows in Fig. 1 a perspective view of a section of an exhaust system of an internal combustion engine of a motor vehicle with an exhaust pipe, a pressure tap pipe and a condensate separator; Fig. 2 a side view of the in Fig. 1 exhaust system shown; Fig. 3 a sectional view of the in Fig. 1 exhaust system shown; Fig. 4 a perspective and enlarged view of the condensate separator made of Fig. 1; Fig. 5. The condensate separator in a cutaway view; Fig. 6. A condensate separator collection container in a cutaway view; Fig. 7 a condensate separator nozzle in a sectional view; Fig. 8 a sleeve of the condensate separator in a cutaway view; Fig. 9 a second embodiment of a condensate separator in a perspective view; Fig. 10 a section of an exhaust system with a condensate separator arranged in a first installation position; Fig. 11 a section of an exhaust system with a condensate separator arranged in a second installation position.

[0034] The Fig. Figures 1 to 3 show different views of a section of the exhaust system 1 of an internal combustion engine (not shown) of a motor vehicle. The exhaust system 1 has an exhaust pipe 2, which carries exhaust gas from the internal combustion engine to the environment of the motor vehicle. The flow direction 3 of the exhaust gas in the exhaust pipe 2 is shown in Fig. Figure 1 is shown with a directional arrow. A pressure tap pipe 4 is also shown, which is pressure-coupled to the exhaust pipe 2. The pressure tap pipe 4 shown in the figures, which is located, for example, downstream of a particulate filter of the exhaust system 1, and another pressure tap pipe 4 (not shown) located upstream of the particulate filter, are connected to at least one pressure sensor for measuring a relative or differential pressure at the particulate filter.

[0035] A condensate separator 5 is arranged at the opening of the pressure tap pipe 4 into the exhaust pipe 2 to collect exhaust gas condensate dripping from the pressure tap pipe 4 into the exhaust pipe 2. This allows exhaust gas sensors, which are usually located upstream of the pressure tap pipe 4, to be positioned downstream of the pressure tap pipe 4. By collecting the condensate droplets, damage or destruction of the downstream exhaust gas sensors, which have a ceramic component, is prevented.

[0036] Based on the Fig. Sections 3 to 8 below explain in more detail the construction of the condensate separator 5 and also the connection of the condensate separator 5 with the exhaust pipe 2 and the pressure tap pipe 4.

[0037] As in the Fig. 4 and Fig. As can be seen in Figure 5, the condensate separator 5 comprises a collection container 6, a nozzle 7, and a sleeve 8. The condensate separator 5 is positioned in an opening of the exhaust pipe 2 and fixed to the exhaust pipe 2 by a welded connection. The condensate separator 5 is pressure-tightly connected to the pressure tap pipe 4 via a compression fitting 9.

[0038] The in Fig. The tubular collection container 6 shown in Figure 6 has a closed base surface 10, which, together with an adjacent wall section 11, forms a closed base tray 12. In a wall section 13 of the collection container 6 facing away from the base surface 10, which adjoins the wall section 11 of the base tray 12, several openings 14 are arranged. These openings, when a condensate separator 5 is installed in the exhaust pipe 2, connect an interior space 15 of the collection container 6 and an interior space 16 of the exhaust pipe 2 under pressure (see Figure 6). Fig. 3 and Fig. 4) The openings 14 are evenly distributed around the circumference of the collection container 6. The collection container 6 of the condensate separator 5 is installed directly below the outlet of the pressure tap pipe 4 in the interior 16 of the exhaust pipe 2.

[0039] The in Fig. The nozzle 7 of the condensate separator 5, as illustrated in Figure 7, includes a central recess 17 which extends over the entire axial length of the nozzle 7 and also forms a receptacle for the pressure tap tube 4. To create a pressure-tight connection between the nozzle 7 and the pressure tap tube 4 by means of the compression fitting 9, the nozzle 7 has a threaded section 18 with an external thread. The compression fitting 9 comprises a cutting ring 19 and a union nut 20, which is screwed onto the threaded section 17 and has an internal thread (see Figure 7). Fig. 4) Furthermore, the nozzle 7 has a flange 21 for fixing the nozzle 7 or the condensate separator 5 in the opening of the exhaust pipe 2. The flange 21 is welded to an edge region of the exhaust pipe 2 surrounding the opening. For fixing the collection container 6, the nozzle 7 has a mounting area 22 with an outer diameter matched to the inner diameter of the collection container 6. Fixing is preferably achieved by a weld in an overlap area. The nozzle 7 also includes a pipe section 23 open at both ends, which is arranged coaxially with the pressure tap pipe 4 and forms an extension of the pressure tap pipe 4. The pipe section 23 and the pressure tap pipe 4 have an identical inner diameter. As shown in the Fig. 4 and Fig. As can be seen in Figure 5, the pipe section 23 has a smaller axial extent than the collection container 6, so that a free space 25 is formed between the bottom tray 12 and one of the end areas 24 facing it, of the pipe section 23.

[0040] In a region facing the flange 21, the pipe section 23 has several openings 26, which are evenly distributed around the circumference of the pipe section 23. These openings 26 ensure a pressure connection between the interior 15 of the collection tank 6 and the interior 27 of the pipe section 23 or the pressure tap pipe 4 in the event that the end region 24 of the pipe section 23, facing away from the flange 21, is blocked, for example by frozen condensate.

[0041] The in Fig. The sleeve 8 shown in Figure 8 has a tubular mounting area 28 for fixing it to the pipe section 23 of the nozzle 7 and an outwardly directed projection 29. The mounting area 28 and the projection 29 form an obtuse angle 30. The sleeve 8 is arranged on the pipe section 23 and relative to the openings 26 in the pipe section 23 such that the projection 29 forms a circumferential guide surface inclined towards the openings 26 for the return flow of condensate that has escaped from the openings 26 (see Figure 8). Fig. 4 and Fig. 5) The function of the condensate separator 5, located in an opening of the exhaust pipe 2 and described above, will now be briefly described. After the internal combustion engine is started, the collection container 6 located in the exhaust pipe 2 is gradually heated by the hot exhaust gas flow. Condensate forming in the pressure tap pipe 4 drips through the pipe section 23 of the nozzle 7 into the collection container 6 and contacts the heated base surface 10 of the drip tray 12. When the temperature of the base surface 10 is below the evaporation temperature of the condensate, it is collected in the drip tray 12. When the temperature of the base surface 10 or the drip tray 12 reaches the evaporation temperature, the collected condensate and any further condensate droplets dripping from the pressure exhaust pipe 4 evaporate.The evaporated condensate then leaves the collection container 6 through the openings 14 of the collection container 6, which also form a pressure connection between the interior spaces 15, 16 of the collection container 6 and the exhaust pipe 2.

[0042] If the temperature of the collection container 6 exceeds the evaporation temperature of the condensate, the condensate droplets will no longer evaporate upon contact with the base surface 10 or the drip tray 12, but will instead be atomized into minute liquid particles. These atomized liquid particles can then also enter the collection container through openings 14.

[0043] After the internal combustion engine is switched off, the collection container 6 cools down slowly. With the internal combustion engine switched off and the vehicle parked, condensate still dripping from the pressurized exhaust pipe 4 is collected in the area of ​​the bottom tray 12 of the condensate separator 5. In winter temperatures, this condensate can freeze, which can then seal the end section 24 of the pipe section 23. When the end section 24 of the pipe section 23 is sealed, the openings 26 in the pipe section 23 provide the pressure connection between the pressure tap pipe 4 and the exhaust pipe 2. Condensate that flows along the inner walls of the pipe section 23 and exits through the openings 26 is guided back towards the openings 26 by the inclined projections 29 of the sleeve 8 and flows back into the pipe section 23.

[0044] Fig. Figure 9 shows a second embodiment of the condensate separator 5. This differs by a different design of the sleeve 8, an additional insert 31 made of fabric in the free space 25 of the bottom tray 12 and an additional guide element 32.

[0045] As can be clearly seen, the sleeve 8 has a smaller mounting area 28 and a second projection 33 in a section facing the base tray 12. This projection 33 also faces outwards and forms an obtuse angle with the mounting area 28. The upper projection 29 of the sleeve 8, facing the flange 21, abuts a shoulder 34 of the nozzle 7, the nozzle 7 having a web 35 in this area for supporting and securing the sleeve 8. To ensure the pressure connection through the openings 26 in the pipe section 23, openings are provided in the upper area of ​​the sleeve 8 facing the flange, though these are not visible in the figure.

[0046] When the floor surface 10 is very hot, condensate droplets that strike it are catapulted away without evaporating or atomizing. To prevent this effect, the insert 31 made of fabric is provided. The insert 31, made of wire mesh or wire knitting, increases the surface area, forms an impact surface, and prevents direct contact between the condensate droplets and the very hot floor surface. The previously mentioned guide element 32 is arranged on an inner surface of the collection container 6, fixes the insert 31 in the area of ​​the base tray 12, and, with its inwardly directed projection 36, simultaneously forms another impact surface for the condensate droplets or liquid particles moving or accelerating in the collection container 6.A slit-shaped opening 37 between an end area of ​​the display 36 and the pipe section 23 ensures that evaporated or atomized condensate from the area of ​​the bottom tray 12 can flow towards the opening 14 in the collection container 6.

[0047] The optimal installation position of the condensate separator 5 is in Fig. Figure 10 shows the following. Here, a central axis 38 of the condensate separator 5 is arranged at an angle 39 of 90° to a horizontal plane 40 spanned by the vehicle's longitudinal axis (x-axis) and transverse axis (y-axis). In this installation position, the collection tank 6 has a maximum collection volume for condensate.

[0048] Fig. Figure 11 shows an installation position of the condensate separator 5 with a minimum installation angle. The angle 39 between the central axis 38 of the condensate separator 5 and the horizontal plane 40 is 30°. In this installation position, the collection tank 6 has a minimum collection volume for condensate. At an angle 39 smaller than 30°, the condensate collected in the collection tank 6 would leak out of the openings 14 in the collection tank 6.

[0049] The dashed line 41 in the Fig. 4 and Fig. Figure 9 shows the arrangement of the liquid level at a minimum installation angle of the condensate separator 5. At this installation angle, the liquid level is parallel to the horizontal plane 40. Depending on the axial arrangement of the openings 14 in the collection container 6, the minimum collection volume of the collection container 6 also changes. Reference symbol list 1 Exhaust system 2 exhaust pipe 3 Flow direction 4 Pressure tap tube 5 condensate separators 6 collection containers 7 nozzles 8 Sleeve 9 Cutting ring screw connection 10 floor area 11 Wall section 12 Base tray 13 Wall section 14 Breakthrough 15 Interior (container) 16 Interior (exhaust pipe) 17 recess 18 thread section 19 cutting ring 20 Union nuts 21 Flange 22 Mounting area 23 Pipe section 24 End range 25 free space 26 Breakthrough 27 Interior (pipe section) 28 Mounting area 29th Exhibition 30 angles 31 deployment 32 guide element 33rd Exhibition Paragraph 34 35 Bridge 36 Exhibition 37 slit-shaped opening 38 Central axis 39 angles 40 Horizontal plane 41 dashed line

Claims

[1] Exhaust system(1) of an internal combustion engine of a motor vehicle • with at least one exhaust pipe (2) which carries exhaust gas from the internal combustion engine to the environment of the motor vehicle, • with at least one pressure tap pipe (4) which is pressurised to the exhaust pipe (2), wherein a condensate separator (5) is provided for collecting condensate dripping from the pressure tap pipe (4) into the exhaust pipe (2), the condensate separator (5) comprises a collection container (6) which is arranged below an outlet area of ​​the pressure tap pipe (4) in the exhaust pipe (2), and the condensate separator (5) has a nozzle (7) connected to the collection container (6) with a flange (21) for fixing the condensate separator (5) in an opening of the exhaust pipe (2), and the nozzle (7) has a recess (17) for receiving the pressure tap pipe (4), wherein the pressure tap pipe (4) is pressurised to the nozzle (7) of the condensate separator (5). characterized by, that the nozzle (7) has a threaded section (18) surrounding the recess (17), wherein the pressure tap tube (4) arranged in the recess (17) is connected pressure-tight to the nozzle (7) of the condensate separator (5) by means of a cutting ring (19) and a union nut (20) screwed onto the threaded section (18). [2] Exhaust system (1) according to claim 1, characterized by , that the collection container (6) has at least one opening (14) which connects the interior (15) of the collection container (6) and the interior (16) of the exhaust pipe (2) in terms of pressure. [3] Exhaust system (1) according to claim 2, characterized by , that the collection container (6) is tubular in shape and has a closed bottom tray (12), wherein the at least one opening (14) is arranged in a wall section (13) of the collection container (6) facing away from the bottom tray (12). [4] Exhaust system (1) according to at least one of the preceding claims, characterized by , that the nozzle (7) comprises a pipe section (23) arranged coaxially to the pressure tap pipe (4), wherein the pipe section (23) and the pressure tap pipe (4) have an identical inner diameter. [5] Exhaust system (1) according to claims 3 and 4, characterized by , that the pipe section (23) has a smaller axial extent than the collection container (6), so that a free space (25) is formed between the bottom tray (12) and one of the end regions (24) of the pipe section (23) facing it. [6] Exhaust system (1) according to claims 3 and 4 or claim 5, characterized by , that a wall surface of the pipe section (23) in an area facing away from the bottom tray (12) has at least one opening (26). [7] Exhaust system (1) according to claim 6, characterized by, that a sleeve (8) with at least one outwardly directed projection (29) is fixed on the pipe section (23), wherein a fastening area (28) of the sleeve (8) and the projection (29) enclose an obtuse angle (30) and that the projection (29) forms a circumferential guide surface for condensate inclined in the direction of the opening (26). [8] Exhaust system (1) according to claim 7, characterized by , that the sleeve (8) has a second outwardly directed projection (33) in a section facing the bottom tray (12), wherein the fastening area (28) and the second projection (33) enclose an obtuse angle. [9] Exhaust system (1) according to claim 5, characterized by , that in the free space (25) between the bottom tray (12) and the end area (24) of the pipe section (23) facing the bottom tray (12) an insert (31) made of a woven or knitted fabric is arranged. [10] Exhaust system (1) according to claim 9, characterized by, that a guide element (32) is arranged on an inner surface of the collection container (6) such that • that the insert (31) is fixed between the guide element (32) and the base tray (12) and / or • that a slit-shaped opening (37) is formed between an inwardly inclined projection (36) of the guide element (32) and the pipe section (23) of the nozzle (7). [11] Exhaust system (1) according to at least one of the preceding claims, characterized by , that the condensate separator (5) is arranged in the exhaust pipe (2) such that a central axis (38) of the condensate separator (5) has an angle (39) between 30° and 90° with respect to a horizontal plane (40) spanned by a longitudinal axis (x-axis) of the vehicle and a transverse axis (y-axis) of the vehicle.

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