Exhaust gas removal device

Abstract

An exhaust gas removal device (2) for removing exhaust gases from an exhaust gas line (8) of an internal combustion engine (3) has an exhaust gas sensor (4), which is designed to be introduced into the exhaust gas line (8) of the internal combustion engine (3), and a separation device (16), which is arranged, in the direction of flow of the exhaust gases, between the exhaust gas sensor (4) and an exhaust gas discharge tube (10) and is designed to separate condensate (18) contained in the exhaust gases.

Description

[0001] Description

[0002] title

[0003] The invention relates to an exhaust gas extraction device for extracting exhaust gases from an exhaust system of an internal combustion engine.

[0004] State of the art

[0005] In order to test the exhaust gases of an internal combustion engine with an exhaust gas testing device ("exhaust gas tester"), a partial flow of the exhaust gases flowing out of an exhaust system, in particular from an exhaust tailpipe, of the internal combustion engine is collected with an exhaust gas sampling device and fed to the exhaust gas tester through a hose connection.

[0006] Especially in diesel engines, exhaust gas testing also includes determining the concentration of soot particles in the exhaust gases. Deposits of soot particles in the hose connection connecting the exhaust gas sampling device to the exhaust gas analyzer can influence the measurement results, for example, if previously accumulated soot particles detach from the hose connection and enter the exhaust gas analyzer.

[0007] It is therefore an object of the invention to improve the reliability of the measurement results provided by an exhaust gas tester.

[0008] To achieve this object, the present invention comprises an exhaust gas sampling device for sampling exhaust gases from an exhaust system of an internal combustion engine, which device has an exhaust gas probe, an output pipe and a separation device.

[0009] The exhaust gas probe is designed to be inserted into the exhaust system of the internal combustion engine. The exhaust gas probe has an exhaust gas inflow channel designed to receive exhaust gases from the exhaust system. The exhaust gas probe is designed to be particularly heat-resistant. The outlet pipe of the exhaust gas sampling device is designed to connect to an exhaust gas sampling hose and includes an exhaust gas outflow channel designed to discharge the exhaust gases received by the exhaust gas probe into the exhaust gas sampling hose.

[0010] The separation device is arranged in the flow direction of the exhaust gases between the exhaust gas probe and the discharge pipe and is designed to separate condensate contained in the exhaust gases so that it does not enter the exhaust gas outlet channel.

[0011] Condensate that has accumulated in the exhaust system, especially in the muffler, of the combustion engine and enters the exhaust gas probe along with the exhaust gases is also retained in the separator, preventing it from entering the exhaust gas sampling hose. The separator acts as a "water trap" for this condensate.

[0012] An undesirable accumulation of soot particles in a hose connection is promoted by exhaust gas condensate that has condensed on the inner wall of the hose connection, since soot particles adhere particularly well to a moist inner wall.

[0013] According to the invention, the deposition of soot particles on the inner wall of the hose connection is reduced or prevented by separating condensate contained in the exhaust gases in the separation device provided upstream of the hose connection in the exhaust gas flow, so that the condensate does not enter the hose connection.

[0014] By separating the condensate from the exhaust stream upstream of the hose connection, the deposition of condensate on the inner wall of the hose connection can be significantly reduced. As a result, the inner wall of the hose connection remains essentially dry, preventing any, or at least significantly fewer, soot particles from accumulating on the inner wall.

[0015] In one embodiment, the exhaust gas probe is designed to be mechanically flexible, allowing it to be inserted into the exhaust system particularly easily and conveniently. In one embodiment, the separation device has a collecting container designed to hold the separated condensate.

[0016] The collection vessel extends essentially in a first direction, and the exhaust gas inflow channel opens into the collection vessel in a second direction, which is oriented transversely, in particular orthogonally, to the first direction. This enforces a change in the flow direction of the exhaust gases flowing into the collection vessel from the second direction to the first direction. This change in direction promotes and supports the separation of condensate contained in the exhaust gases from the exhaust gas flow.

[0017] In one embodiment, an exhaust gas extraction channel is formed in the collecting container, which is provided for extracting the exhaust gases from the collecting container. The exhaust gas extraction channel extends, in particular, substantially along the first direction and has an exhaust gas extraction opening that is spaced along the first direction from the point where the exhaust gas inflow channel opens into the collecting container.

[0018] An exhaust gas extraction duct designed in this way forces an additional change in the flow direction of the exhaust gases flowing into the collection vessel before they can leave the collection vessel through the exhaust gas extraction duct. This additional change in direction results in additional separation of condensate contained in the exhaust gases.

[0019] In one embodiment, the exhaust gas outflow channel opens into the exhaust gas extraction channel in a third direction which is oriented transversely, in particular orthogonally, to the first direction.

[0020] In one embodiment, the exhaust gas outflow channel extends in a common plane with the exhaust gas inflow channel. The exhaust gas outflow channel can, in particular, extend parallel to or in a common line with the exhaust gas inflow channel.

[0021] Such a design of the separator device allows for easy integration into an exhaust gas extraction device. In this way, the separator device can be particularly well integrated into a handle of an exhaust gas extraction device.

[0022] In one embodiment, the collection vessel is at least partially transparent. This allows the flow of exhaust gases through the collection vessel and the accumulation of separated condensate at the bottom of the collection vessel to be easily monitored from the outside. In particular, a condition can be detected in which so much condensate has accumulated in the collection vessel that the separated condensate must be removed from the collection vessel.

[0023] In one embodiment, the collecting container is designed to be removable. The collecting container can also be designed with a draining device.

[0024] By dismantling the collection tank and / or opening a drain device, separated condensate can be easily and reliably removed from the collection tank.

[0025] In one embodiment, at least one air supply opening is formed in the discharge pipe, which is in fluid communication with the exhaust gas outflow channel. Such an air supply opening makes it possible to supply an additional gas, in particular air, to the exhaust gases flowing through the exhaust gas outflow channel in order to dilute the exhaust gases flowing through the exhaust gas outflow channel.

[0026] By diluting the exhaust gases, the particle concentration in the exhaust gases can be reduced. This can improve the accuracy of the measurement results by reducing the influence of contamination on the measurement results.

[0027] In one embodiment, the exhaust gas sampling device comprises an exhaust gas sampling hose configured with a first flow channel and a second flow channel. One of the two flow channels is fluidly connected to the exhaust gas outflow channel. The other of the two flow channels is fluidly connected to the at least one air supply opening. Such an exhaust gas sampling hose makes it possible, with a single hose, to both sample the exhaust gases from the exhaust gas sampling device and supply them to the exhaust gas tester, as well as to supply air to the exhaust gas sampling device to dilute the exhaust gases.

[0028] In one embodiment, the first flow channel is formed within the second flow channel, so that the first flow channel is surrounded by the second flow channel. This enables a particularly compact design of the exhaust gas extraction hose.

[0029] In alternative embodiments, the two flow channels are arranged side by side. The first and second flow channels can also be formed in two separate tubes.

[0030] In one embodiment, the exhaust gas sampling device has a handle, and the separating device is integrated into the handle of the exhaust gas sampling device. Integrating the separating device into a handle of the exhaust gas sampling device enables a particularly compact design of the exhaust gas sampling device.

[0031] In one embodiment, the exhaust gas sampling device comprises a fastening device, in particular a clamping device, which allows the exhaust gas sampling device to be fastened to an exhaust system of an internal combustion engine. Such a fastening device can simplify the operation of the exhaust gas sampling device and improve the reliability of the measurement. In particular, the fastening device can reliably prevent the exhaust gas sampling device from accidentally slipping out of the exhaust system.

[0032] Short description of the characters

[0033] Figure 1 shows a schematic side view of a conventional exhaust gas sampling device for sampling exhaust gases from an exhaust system of an internal combustion engine.

[0034] Figure 2 shows a longitudinal sectional view of a first embodiment of an exhaust gas sampling device according to the invention. Figure 3 shows a longitudinal sectional view of a second embodiment of an exhaust gas sampling device according to the invention.

[0035] Character description

[0036] Figure 1 shows a schematic side view of a conventional exhaust gas sampling device 1 for sampling exhaust gases from an exhaust system 8 of an internal combustion engine 3.

[0037] The exhaust gas sampling device 1 comprises an exhaust gas probe 4, which is designed to be introduced into the exhaust system 8 of the internal combustion engine 3. Within the exhaust gas probe 4, an exhaust gas inflow channel (not visible in Figure 1) is formed, which is intended to receive exhaust gases from the exhaust system 8.

[0038] A handle 26 is formed at an end of the exhaust gas probe 4 facing away from the exhaust line 8. An exhaust gas sampling hose 14 is attached to the end of the handle 26 opposite the exhaust gas probe 4, through which the exhaust gases, after being collected by the exhaust gas probe 4 and flowing through the handle 26, can be fed to an exhaust gas tester (not shown in Figure 1).

[0039] The exhaust gas sampling device 1 also has a fastening device 24 which enables the exhaust gas sampling device 1 to be fastened to the exhaust line 8 of the internal combustion engine 3.

[0040] Figure 2 shows a longitudinal sectional view of a first embodiment of an exhaust gas extraction device 2 according to the invention for extracting exhaust gases from the exhaust system 8 of an internal combustion engine 3.

[0041] The exhaust gas sampling device 2 shown in Figure 2 also has a fastening device 24, which enables the exhaust gas sampling device 1 to be fastened to the exhaust system 8 of the internal combustion engine 3. The fastening device 24 can be designed, in particular, as a clamping device.

[0042] The exhaust gas sampling device 2 also includes a heat-resistant exhaust gas probe 4, which is designed to be inserted into the exhaust system 8 of the internal combustion engine 3. An exhaust gas inflow channel 6 is formed within the exhaust gas probe 4 and is intended to receive exhaust gases from the exhaust system 8. The exhaust gas probe 4 can, in particular, be designed to be mechanically flexible in order to be easily inserted into the exhaust system 8.

[0043] The exhaust gas sampling device 2 also comprises an output pipe 10 which is designed to be connected to an exhaust gas sampling hose 14 and which has an exhaust gas outflow channel 12 which is intended to discharge the exhaust gases received by the exhaust gas probe 4 into the exhaust gas sampling hose 14.

[0044] The exhaust gas extraction hose 14 can be made of Viton, Silokon or Teflon, for example.

[0045] In the flow direction of the exhaust gases between the exhaust gas probe 4 and the discharge pipe 10 there is a separation device 16 according to the invention which is designed to separate condensate 18 contained in the exhaust gases so that the condensate 18 does not reach the exhaust gas outflow channel 12 and from there into the exhaust gas extraction hose 14.

[0046] The separation device 16 comprises a collecting container 17 for separating and receiving the condensate 18. The collecting container 17 can be substantially cylindrical about an axis A.

[0047] The outer diameter D of the collecting container can be between 30 mm and 50 mm, in particular between 35 mm and 40 mm.

[0048] In the embodiment shown in Figure 2, the collecting container 17 is formed with a bottom that is curved outward, similar to the bottom of a test tube. However, the bottom of the collecting container 17 can also be flat.

[0049] The axis A of the cylindrically shaped collecting container 17 extends in a first direction Ri. In the orientation of the exhaust gas sampling device 2 shown in Figure 2, the axis A and the first direction Ri extend vertically. The exhaust gas inflow channel 6 of the exhaust gas probe 4 opens into the collecting container 17 in a second direction 2, which is oriented transversely, in particular orthogonally, to the first direction Ri.

[0050] In the orientation of the exhaust gas extraction device 2 shown in Figure 2, the second direction R2 extends horizontally orthogonal to the first direction Ri. This forces a change in the flow direction of the exhaust gases flowing into the collecting container 17 from the second direction R2 to the first direction Ri. This change in direction promotes and supports the separation of condensate contained in the exhaust gases from the exhaust gas flow.

[0051] The collecting tank 17 can be at least partially transparent. This allows the exhaust gas flow through the collecting tank 17 and the accumulation of separated condensate 18 at the bottom of the collecting tank 17 to be monitored from the outside.

[0052] In particular, without opening the collecting container 17, it can be determined when separated condensate 18 must be removed from the collecting container 17.

[0053] The collecting container 17 can be detachable from the separating device 16 and / or can be provided with a condensate drain device 19. This allows the condensate 18 separated in the separating device 16, which accumulates in the collecting container 17, to be easily removed from the collecting container 17.

[0054] An exhaust gas extraction channel 20 is formed in the collecting container 17, which is provided for extracting the exhaust gases from the collecting container 17 after the condensate 18 has been separated from the exhaust gases.

[0055] The exhaust gas extraction channel 20 extends substantially along the first direction Ri, in particular in the vertical direction, parallel to or along the axis A of the collecting container 17.

[0056] The exhaust gas extraction channel 20 ends at a distance ai above the bottom of the collecting container 17 and at a distance a2 below the opening of the exhaust gas inflow channel 6 into the collecting container 17. The distance ai can be selected in the range between 50 mm and 70 mm, in particular in the range between 55 mm and 65 mm, for example 60 mm.

[0057] The distance a2 can be selected in the range between 30 mm and 50 mm, in particular in the range between 35 mm and 45 mm, for example 40 mm.

[0058] At a lower end of the exhaust gas extraction channel 20, which faces the bottom of the collecting container 17, an exhaust gas extraction opening 22 is formed, which allows exhaust gases to flow from the collecting container 17 into the exhaust gas extraction channel 20.

[0059] Since the exhaust gas extraction opening 22 is formed at a distance a2 below the mouth of the exhaust gas inflow channel 6 into the collecting container 17, the exhaust gases flowing from the exhaust gas inflow channel 6 into the collecting container 17 must change their flow direction at least twice before they can flow through the exhaust gas extraction opening 22 into the exhaust gas extraction channel 20.

[0060] In particular, the flow direction of the exhaust gases must first change from direction 2 to direction Ri when the exhaust gases flow from the exhaust gas inflow channel 6 into the collecting tank 17. The flow direction of the exhaust gases must then change again by 180° so that the exhaust gases can flow from the collecting tank 17 into the exhaust gas extraction channel 20.

[0061] These multiple changes in flow direction cause the condensate 18 to be separated from the exhaust gas flow and to collect at the bottom of the collecting container 17, as shown in Figure 2.

[0062] At an end of the exhaust gas extraction channel 20 facing away from the exhaust gas extraction opening 22, which is shown at the top in Figure 2, the exhaust gas outflow channel 12 of the discharge pipe 10 opens into the exhaust gas extraction channel 20.

[0063] The exhaust gas extraction hose 14 is attached to the outlet pipe 10, so that the exhaust gases entering the exhaust gas extraction channel 20 through the exhaust gas extraction opening 22 flow through the exhaust gas outlet channel 12 into the exhaust gas extraction hose 14. The exhaust gases are fed to the exhaust gas tester 30 through the exhaust gas extraction hose 14.

[0064] Because condensate 18 contained in the exhaust gases is separated in the separation device 16 before the exhaust gases flow into the exhaust gas extraction hose 14, the amount of moisture that enters the exhaust gas extraction hose 14 is significantly reduced.

[0065] This significantly reduces the risk of condensate depositing on the inner wall of the exhaust gas sampling hose 14. Since soot particles contained in the exhaust gases adhere particularly well to moist walls of the exhaust gas sampling hose 14, the reduction of condensate in the exhaust gas sampling hose 14 also significantly reduces the deposition of soot particles in the exhaust gas sampling hose 14, which could falsify the measurement results.

[0066] The discharge pipe 10 with the exhaust gas outflow channel 12 extends in a third direction R3, which is oriented transversely, in particular orthogonally, to the first direction Ri. In the embodiment shown in Figure 2, the discharge pipe 10 is aligned in the same plane, in particular in a line, with the exhaust gas probe 4 and the exhaust gas inflow channel 6.

[0067] In other embodiments, which are not explicitly shown in the figures, the dispensing tube 10 can also be oriented in a different direction.

[0068] The separation device 16 can be formed in a handle 26 of the exhaust gas sampling device 2, as shown in Figure 1. By integrating the separation device 16 into the handle 26 of the exhaust gas sampling device 2, the exhaust gas sampling device 2 can be designed to be particularly compact.

[0069] The handle 26 can have a length between 80 mm and 120 mm, in particular a length L of 100 mm.

[0070] Figure 3 shows a longitudinal sectional view of a second embodiment of an exhaust gas sampling device 2 according to the invention for sampling exhaust gases from the exhaust system 8 of an internal combustion engine 3. The exhaust gas probe 4 with the exhaust gas inflow channel 6 and the separation device 16 of the second embodiment are identical to the exhaust gas inflow channel 6 and the separation device 16 according to the first embodiment shown in Figure 2. Identical elements are provided with the same reference numerals and will not be described again in detail. For these elements, reference is made to the description of Figure 2.

[0071] The exhaust gas sampling device 2 according to the second embodiment shown in Figure 3 differs from the exhaust gas sampling device 2 according to the first embodiment in that at least one air supply opening 28 is formed in the discharge pipe 10 of the exhaust gas sampling device 2 of the second embodiment, which is in fluid connection with the exhaust gas outflow channel 12.

[0072] Figure 3 shows four air supply openings 28. However, this number of air supply openings 28 is only an example. More or fewer than four air supply openings 28 can also be formed in the dispensing tube 10.

[0073] The at least one air supply opening 28 makes it possible to supply an additional gas, in particular air, to the exhaust gases flowing through the exhaust gas outlet channel 12. By supplying air, the exhaust gases flowing from the exhaust gas outlet channel 12 into the exhaust gas extraction hose 14 can be diluted.

[0074] By diluting the exhaust gases, the concentration of particles in the exhaust gases is reduced. This can reduce the influence of contamination caused by the particles in the exhaust gas tester 30 on the measurement results.

[0075] Since the dilution of the exhaust gases also influences the measurement results, the amount of air introduced into the exhaust gas outlet channel 12 through the at least one air supply opening 28 is controlled and / or measured and taken into account when determining the measurement results. In the embodiment shown in Figure 3, the exhaust gas extraction hose 14 is formed with two separate flow channels 14a, 14b.

[0076] An inner flow channel 14a, which is formed inside the exhaust gas sampling hose 14, is in fluid communication with the exhaust gas outflow channel 12 of the exhaust gas sampling device 2 and serves to supply the exhaust gases flowing out of the exhaust gas sampling device 2 to the exhaust gas tester 30.

[0077] An outer flow channel 14b of the exhaust gas extraction hose 14, which in the embodiment shown in Figure 3 is formed around the inner flow channel 14b, serves to supply air from the environment to the at least one air supply opening 28.

[0078] The air supply through the outer flow channel 14b can be controlled and / or measured by the exhaust gas tester 30. This allows the exhaust gas tester 30 to know the amount of air supplied through the outer flow channel 14b and thus also the resulting dilution of the exhaust gases in the exhaust gas outlet channel 12. The exhaust gas tester 30 can thus take the dilution of the exhaust gases into account when determining and evaluating the measurement results. In this way, measurement errors that would otherwise result from the dilution of the exhaust gases can be avoided.

[0079] The design of the exhaust gas extraction hose 14 shown in Figure 2 with an inner flow channel 14a and an outer flow channel 14b surrounding the inner flow channel 14a is only exemplary.

[0080] In further embodiments, which are not explicitly shown in the figures, the first and the second flow channel 14a, 14b can also be formed next to each other or in two separate tubes.

Claims

Exhaust gas extraction device (2) for extracting exhaust gases from an exhaust stream (8) of an internal combustion engine (3) comprising an exhaust gas probe (4) designed for insertion into the exhaust stream (8) of the internal combustion engine (3) and comprising an exhaust gas inlet channel (6) intended to receive exhaust gases from the exhaust stream (8); wherein the exhaust gas probe (4) is in particular designed to be flexible; an exhaust gas outlet pipe (10) designed for connection with an exhaust gas extraction hose (14) and comprising an exhaust gas outlet channel (12) intended to discharge the exhaust gases received by the exhaust gas probe (4) into the exhaust gas extraction hose (14); and a separator device (16) arranged in the direction of exhaust gas flow between the exhaust gas probe (4) and the exhaust gas outlet pipe (10) and designed to separate condensate (18) contained in the exhaust gases.Exhaust gas extraction device (2) according to claim 1, wherein the separator device (16) has a collection container (17) for receiving the separated condensate (18), the collection container (17) extending substantially in a first direction (Ri) and the exhaust gas inlet channel (6) opening into the collection container (17) in a second direction (R2), which is oriented transversely, in particular orthogonally, to the first direction (Ri). Exhaust gas extraction device (2) according to claim 2, wherein an exhaust gas extraction channel (20) is formed in the collection container (17) for extracting the exhaust gases from the collection container (17), the exhaust gas extraction channel (20) extending substantially along the first direction (Ri), and the exhaust gas extraction channel (20) having an exhaust gas extraction opening (22) extending along the first direction (Ri). a distance from an opening of the exhaust gas inlet channel (6) into the collection container (17). Exhaust gas extraction device (2) according to claim 3, wherein the exhaust gas outlet channel (12) opens into the exhaust gas extraction channel (20) in a third direction (3), which is oriented transversely, in particular orthogonally, to the first direction (Ri). Exhaust gas extraction device (2) according to claim 3 or 4, wherein the exhaust gas outlet channel (12) and the exhaust gas inlet channel (6) extend in a common plane, wherein the exhaust gas outlet channel (12) extends in particular in the same direction (R2, R3) as the exhaust gas inlet channel (6). Exhaust gas extraction device (2) according to one of claims 2 to 5, wherein the collection container (17) is at least partially transparent, demountable and / or equipped with a draining device (19) that makes it possible to remove separated condensate (18) from the collection container (17).Exhaust gas extraction device (2) according to one of the preceding claims, wherein at least one air supply opening (28) is formed in the exhaust gas discharge pipe (10), which is in fluid communication with the exhaust gas discharge channel (12). Exhaust gas extraction device (2) according to claim 7, wherein the exhaust gas extraction device (2) additionally comprises an exhaust gas extraction hose (14) having a first flow channel (14a) and a second flow channel (14b), wherein the first flow channel (14a) is in fluid communication with the exhaust gas discharge channel (12), and wherein the second flow channel (14b) is in fluid communication with the at least one air supply opening (28). Exhaust gas extraction device (2) according to claim 9, wherein the exhaust gas extraction device (2) additionally comprises an exhaust gas extraction hose (14), wherein a first flow channel (14a) is formed within the second flow channel (14b). Exhaust gas extraction device (2) according to any one of the preceding claims, wherein the exhaust gas extraction device (2) comprises a handle (26) and the separator device (16) is integrated into the handle (26) of the exhaust gas extraction device (2); and / or wherein the exhaust gas extraction device (2) has a fastening device (24), in particular a clamping device (24), which enables it to To attach an exhaust gas extraction device (2) to an exhaust gas stream (8) of an internal combustion engine (3).

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