Component of an exhaust system

Abstract

Component of an exhaust system comprising a tubular housing (7) for conveying exhaust gases from an internal combustion engine, - comprising a first pressure inlet pipe (3) extending from the outside into the tubular housing, the opening of which is directed towards an exhaust gas flow (2) in such a way that a back pressure can be built up in the pressure inlet pipe (3) by the exhaust gas flow (2), - comprising a second pressure inlet pipe (4) extending from the outside into the tubular housing, the opening of which is oriented towards the exhaust gas flow in such a way that a lower pressure than the dynamic pressure of the first pressure inlet pipe (3) can be built up in it, wherein the first and second pressure inlet pipes (3,4) have connections outside the tubular housing which can be connected to a control unit of a vehicle.

Description

[0001] The invention relates to a component of an exhaust system of an internal combustion engine comprising a tubular housing. Overview of the invention

[0002] A particulate filter, often used in combustion engines, is designed to remove soot particles or other fine dust from the exhaust gases or the air. Measuring points upstream and downstream of the particulate filter play a crucial role in monitoring the filter condition and the system's efficiency.

[0003] The particulate filter consists of a porous material (e.g. ceramic or metal mesh) that captures particles as gases flow through it.

[0004] One or more pressure sensors and sometimes temperature sensors are usually used to measure the pressure at measuring points before and after the filter.

[0005] This determines the differential pressure between the inlet and outlet sides.

[0006] Temperature sensors help assess operating conditions, e.g., during regeneration.

[0007] The exhaust gases flow through the particulate filter.

[0008] Particles such as soot remain trapped in the filter while the purified gases escape.

[0009] Before the filter, the first measuring point measures the pressure and, if applicable, the temperature of the unfiltered exhaust gases.

[0010] After the filter, the second measuring point measures the pressure and, if applicable, the temperature of the cleaned exhaust gases.

[0011] The differential pressure is the pressure difference between the inlet and outlet of the filter.

[0012] A low differential pressure indicates that the filter is clean. A high differential pressure signals that the filter is clogged and needs to be cleaned (regenerated).

[0013] If the differential pressure is high, the control unit triggers a regeneration in which the particles (e.g. soot) accumulated in the filter are burned.

[0014] Regeneration can be triggered automatically (by high exhaust gas temperatures) or manually.

[0015] The object of the invention is to provide an alternative sensor arrangement or measuring points or a system that replaces the particulate filter without the control unit having to be replaced or reporting an error. Overview of the invention

[0016] The problem is solved by an invention according to the claims.

[0017] The invention comprises a component of an exhaust system comprising a tubular housing for conducting exhaust gases from an internal combustion engine. Typically, this component is a pipe or an extended pipe that is arranged in the exhaust system, often as a replacement for the particulate filter, with the corresponding transitions, possibly also clamps and sleeves.

[0018] The tubular housing comprises a first pressure inlet tube that extends from the outside into the tubular housing. The first pressure inlet tube has a first opening located inside the tubular housing. This first opening is directed against an exhaust gas flow such that a back pressure can be built up in the pressure inlet tube by the exhaust gas flow. The second opening of the first pressure inlet tube is located outside the tubular housing and is connected to a control unit.

[0019] The invention further comprises a second pressure inlet pipe extending from the outside into the tubular housing, the opening of which in the tubular housing is oriented toward the exhaust gas flow in such a way that a lower pressure is built up therein than the back pressure of the first pressure inlet pipe. As with the first pressure inlet pipe, the second outlet is arranged outside the tubular housing and is connected to a control unit.

[0020] The first pressure inlet pipe has an opening directed against the direction of the exhaust gas flow in the tubular housing so that a portion of the exhaust gas flow presses into the opening of the first pressure inlet pipe.

[0021] Preferably, an axis runs through the center of the opening of the first pressure inlet pipe parallel to the exhaust gas flow so that the maximum pressure can be built up.

[0022] In one possible embodiment, the second pressure inlet pipe has an opening pointing in the direction of the exhaust gas flow in the tubular housing, so that substantially no or less pressure is generated in the second pressure inlet pipe, since the exhaust gases do not flow directly or only partially into the second pressure inlet pipe.

[0023] In a preferred embodiment, the axis runs through the center of the opening of the second pressure inlet pipe parallel to the exhaust gas flow.

[0024] In one possible embodiment, the size of the opening of the first and / or second pressure inlet pipe, the orientation of the opening of the first and / or second pressure inlet pipe relative to the exhaust gas flow, and / or the positioning of the pressure inlet pipe within the tubular housing are coordinated such that the differential pressure is recognized as permissible by the control unit. The diameters of the pressure inlet pipes can be varied. Funnel-shaped pressure inlet pipes are also conceivable. Bends or angles in the pressure inlet pipes are also possible, or alternatively, actuators that reduce the passage in the pressure inlet pipes are used.

[0025] It is possible for the first or second pressure inlet pipe within the housing to have a bend ranging from 0 to 90 degrees, allowing it to be directed against or with the exhaust flow. This allows different differential pressures to be created to suit the control unit.

[0026] In one possible embodiment, the position and / or orientation of the first or second pressure inlet tube in the tubular housing can be adjusted and fixed to achieve different differential pressures. This can be achieved by screwing the pressure inlet tube to the housing using nuts and locknuts. Alternatively, adjustment devices can be used to change the opening or flow rate of the pressure inlet tube.

[0027] In a preferred embodiment, the control unit is a control unit for a particle filter.

[0028] In one possible embodiment, a catalyst, filter and / or a metal substrate through which the exhaust gas flow extends is arranged in the tubular housing between the first and second pressure inlet pipes.

[0029] In one possible embodiment, the housing has the external shape and connections of a particulate filter, so that it can be used as a replacement component.

[0030] This prevents the control unit from issuing an error message after removing the OEM particulate filter, preventing the vehicle from functioning properly (e.g., for testing purposes or racetrack use).

[0031] This can be remedied by equipping the pressure sensing points with a pressure inlet pipe aligned with the exhaust stream. The shape of the pipe can vary and is adapted to the specific system.

[0032] An element that increases back pressure (sports catalyst, another particulate filter, or something else) can be located between the measuring points. Measuring points 1 and 2 can be located individually or together within the back pressure-increasing element (through holes, etc.). However, it can also be a continuous pipe or a similar empty hollow body.

[0033] The pressure query points are connected (like the original particulate filter) to the vehicle manufacturer's control unit and supply it with measurable values, which are then within the range of the OEM particulate filter.

[0034] Reprogramming the software or making other changes is no longer necessary. Character description Fig. 1 shows an exhaust system with a control unit arranged with two pressure inlet pipes before and after the particulate filter; Fig. 2 shows an exhaust system with a control unit arranged with two pressure inlet pipes before and after a through pipe; Fig. 3 shows different arrangements and shapes of the pressure inlet pipes; Fig. Figure 4 shows the arrangement of the pressure inlet tube within the substrate inside the particulate filter. Description of the characters

[0035] The Fig. 1 branches off an exhaust system 1 with an exhaust gas flow 2, which is represented by arrows. In the exhaust gas flow, a pressure inlet pipe 3 serves as measuring point 1 and a pressure inlet pipe 4 serves as measuring point 2. Both pressure inlet pipes are connected to a control unit 5 of the vehicle manufacturer. A metal substrate 6 or a ceramic is arranged in the tubular housing of the particulate filter. Alternatively, as in Fig. 2 a continuous pipe 7 can be used.

[0036] The pressure query points are designed with a pressure inlet pipe 3 and 4 which are arranged in the exhaust gas flow 2 and are differently aligned.

[0037] The shape and orientation of the pipe can vary and is adapted to the respective system ( Fig. 3).

[0038] An element that increases the dynamic pressure, such as a metal substrate, can be located between the measuring points ( Fig. 1), alternatively it can be a sports catalyst or another particulate filter 6. The measuring points 1 and 2 can be located individually or together within the back pressure increasing element in which the pressure inlet pipe is guided, for example, through bores, as in Fig. 4 shown.

[0039] However, it can also be a continuous tube 7 or a similar empty hollow body as in Fig. 2 shown.

[0040] The pressure inlet pipes 3 and 4 are connected (like the original particulate filter) to the control unit 5 of the vehicle manufacturer and supply it with measurable values, which are then in the range of the OEM particulate filter.

[0041] The Fig. Figure 3 shows the different arrangement and design of a pressure inlet pipe 3 or 4. This can be bent at a 90-degree angle. It can be kinked at an approximately 45-degree angle, or it can protrude straight into the housing without any angle.

[0042] Reprogramming the software or making other changes is no longer necessary. List of reference symbols 1 exhaust system 2 Exhaust gas flow 3 Pressure inlet pipe measuring point 1 4 Pressure inlet pipe measuring point 2 5 Control unit of the vehicle manufacturer 6 Metal substrate 7 continuous pipe

Claims

[1] Component of an exhaust system comprising a tubular housing (7) for passing exhaust gases of an internal combustion engine, - comprising a first pressure inlet pipe (3) which extends from the outside into the tubular housing, the opening of which is directed towards an exhaust gas flow (2) in such a way that a back pressure can be built up in the pressure inlet pipe (3) by the exhaust gas flow (2), - comprising a second pressure inlet pipe (4) which extends from the outside into the tubular housing, the opening of which is aligned with the exhaust gas flow in such a way that a lower pressure than the back pressure of the first pressure inlet pipe (3) can be built up in it, wherein the first and second pressure inlet pipes (3, 4) have connections outside the tubular housing which can be connected to a control unit of a vehicle. [2] The component of an exhaust system according to the preceding claim, characterized bythat the first pressure inlet pipe (3) has an opening which is directed against the direction of the exhaust gas flow in the tubular housing, so that a part of the exhaust gas flow (2) presses into the opening of the first pressure inlet pipe. [3] The component of an exhaust system according to the preceding claim, characterized by that an axis through the center of the opening of the first pressure inlet pipe (3) runs parallel to the exhaust gas flow. [4] The component of an exhaust system according to any one of the preceding claims, characterized by that the second pressure inlet pipe (4) has an opening which points in the direction of the exhaust gas flow (2) in the tubular housing, so that substantially no or a lower pressure is generated in the second pressure inlet pipe (4). [5] The component of an exhaust system according to the preceding claim, characterized bythat the axis through the center of the opening of the second pressure inlet pipe (4) runs parallel to the exhaust gas flow. [6] The component of an exhaust system according to any one of the preceding claims, characterized by that the size of the opening of the first and / or second pressure inlet pipe (3,4), the orientation of the opening of the first and / or second pressure inlet pipe (3,4) in relation to the exhaust gas flow (4), and / or the positioning of the pressure inlet pipe within the tubular housing are coordinated with one another in such a way that the differential pressure is recognized as permissible for the control unit. [7] The component of an exhaust system according to any one of the preceding claims, characterized by that the first / or second (3,4) pressure inlet pipe within the housing has a bend which is in the range of 0 to 90 degrees in order to be directed against the exhaust gas flow or with the exhaust gas flow. [8] The component of an exhaust system according to any one of the preceding claims, characterized by that the control unit (5) is a control unit for a particle filter. [9] The component of an exhaust system according to any one of the preceding claims, characterized by that in the tubular housing between the first and second pressure inlet pipes a catalyst, filter and / or a metal substrate (6) is arranged through which the exhaust gas flow extends. [10] The component of an exhaust system according to any one of the preceding claims, characterized by that the housing has the external shape and connections of a particulate filter so that it can be used as a replacement component. [11] The component of an exhaust system according to any one of the preceding claims, characterized bythat the position and / or orientation of the first or second pressure inlet pipe in the tubular housing is adjustable and fixable in order to set different differential pressures.

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