EP2466088A1 - Exhaust system - Google Patents
Exhaust system Download PDFInfo
- Publication number
- EP2466088A1 EP2466088A1 EP10015613A EP10015613A EP2466088A1 EP 2466088 A1 EP2466088 A1 EP 2466088A1 EP 10015613 A EP10015613 A EP 10015613A EP 10015613 A EP10015613 A EP 10015613A EP 2466088 A1 EP2466088 A1 EP 2466088A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bleed
- passage
- exhaust
- conduit
- exhaust system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/008—Mounting or arrangement of exhaust sensors in or on exhaust apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/45—Sensors specially adapted for EGR systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/08—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a pressure sensor
Definitions
- the present disclosure relates generally to an exhaust system.
- EGR exhaust gas recirculation
- Exhaust gas is inherently dirty and potentially aggressive as it contains many constituents, including water, that together and potentially with other additional chemicals (such as for example urea) can form deposits in the systems thereby reducing or halting proper operation of the various components and/or systems.
- the current disclosure is aimed at alleviating some of such problems.
- the present disclosure details an exhaust system for a combustion engine comprising an exhaust passage having a first conduit port, a first sensing portion configured to determine a parameter related to a pressure of exhaust gas in the exhaust passage, the first sensing portion being remote from the exhaust passage. Furthermore, a first conduit extends between the first sensing portion and the first conduit port for fluidly connecting the first sensing portion with the exhaust passage and a first bleed passage extends between the first conduit and a first bleed connection for fluidly connecting the first bleed passage with another portion of the exhaust system enabling a substantially continuous flow of exhaust gas through at least a portion of the first conduit.
- Figs. 1 to 6 are schematic illustrations of exemplary embodiments of a sensing arrangement 10 for an exhaust system 12 of a combustion engine 14 such as for example an internal combustion engine.
- An exhaust passage 16 may be fluidly connected to the combustion engine 14 to conduct exhaust gasses.
- the exhaust passage 16 may for example be an exhaust gas recirculation (EGR) passage to conduct exhaust gasses from an exhaust portion of the combustion engine 14 to an intake portion of the combustion engine 14.
- EGR exhaust gas recirculation
- the exhaust passage 16 may additionally or alternatively be conducting exhaust gas from or to an aftertreatment arrangement and/or to the environment.
- the sensing arrangement 10 may include a first sensing portion 20a. In another embodiment the sensing arrangement may include at least a first sensing portion 20a and a second sensing portion 20b.
- the sensing arrangement 10 may be configured to determine parameters relating to an exhaust gas pressure.
- the first and second sensing portions 20a and 20b may for example be individual pressure sensors such as absolute pressure sensors. Alternatively, the first and second sensing portions 20a and 20b may actually be portions of a single sensor such as a ⁇ p ("delta-pressure") sensor.
- First sensing portion 20a may be remote from the exhaust passage 16 and may be fluidly connected to the exhaust passage 16 via a first conduit 22.
- the fluid connection of the first conduit 22 with the exhaust passage 16 will from hereon be referred to as first conduit port 23.
- second sensing portion 20b may be remote from the exhaust passage 16 and may be fluidly connected to the exhaust passage 16 via a second conduit 24.
- the fluid connection of the second conduit 24 with the exhaust passage 16 will from hereon be referred to as second conduit port 25.
- a first bleed passage 26 may extend from the first conduit 22 to a portion of the exhaust system 12 to fluidly connect them together.
- the fluid connection of the first bleed passage 26 with the portion of the exhaust system 12 it fluidly connects to will from hereon be referred to as the first bleed connection 27.
- the first bleed passage 26 may extend from the first conduit 22 to the exhaust passage 16 and the first bleed connection 27 is then the fluid connection between the first bleed passage 26 and the exhaust passage 16.
- a second bleed passage 28 may extend from the second conduit 24 to a portion of the exhaust system 12 to fluidly connect them together.
- the fluid connection of the second bleed passage 28 with the portion of the exhaust system 12 it fluidly connects to will from hereon be referred to as the second bleed connection 29.
- the second bleed passage 28 may extend from the second conduit 24 to the exhaust passage 16 and the second bleed connection 29 is then the fluid connection between the second bleed passage 28 and the exhaust passage 16.
- first and/or second bleed passages 26 and 28 may have cross-sectional diameters, or orifices with such a cross-sectional diameter, which are small compared to the exhaust passage 16 such that the flow through the first and/or second bleed passages 26 and 28 may be little or even insignificant compared to the flow flowing through the exhaust passage 16.
- the exhaust passage 16 may have a restriction 18 therein, dividing the exhaust passage 16 in an upstream portion 16a and a downstream portion 16b.
- the restriction 18 may be a restrictor having a fixed cross-sectional opening such as for example a fixed venturi.
- the restriction 18 may have a variable cross-sectional opening therethrough such as for example a valve arrangement including a moveable valve member.
- first bleed connection 27 and/or the second bleed connection 29 in the exhaust system may be chosen as suitable.
- first bleed connection 27 may be located on upstream portion 16a, on downstream portion 16b, on a portion of the exhaust passage 16 upstream of the first conduit port 23 or on a portion of the exhaust passage 16 downstream of the first conduit port 23.
- the second bleed connection 29 may be located on upstream portion 16a, on downstream portion 16b, on a portion of the exhaust passage 16 upstream of the second conduit port 25 or on a portion of the exhaust passage 16 downstream of the second conduit port 25.
- Figs. 3 and 4 show exemplary embodiments in which an additional restricting element 30 may be present in the exhaust passage.
- the restricting element 30 may be anything that provides resistance to the gas flow and may for example include a components such as a turbocharger or a valve, but may also be a just a bend or narrowing in the conduit for example.
- the characteristic of the restricting element 30 is that the gas flow therethrough is restricted such that there is a gas pressure differential across the restricting element 30.
- the first bleed connection 27 may be located in a portion of the exhaust passage 16 upstream of the restricting element 30 whilst the first conduit port 23 is located in a portion of the exhaust passage 16 downstream of the restricting element 30.
- the second bleed connection 29 may be located in a portion of the exhaust system upstream of the restriction 18 whilst the second conduit port 25 is located in a portion of the exhaust passage 16 downstream of the restriction 18. It is to be understood that the restricting element 30 may be omitted.
- the first bleed connection 27 may be located in a portion of the exhaust passage 16 downstream of the restriction 18 whilst the first conduit port 23 maybe located in a portion of the exhaust passage 16 upstream of the restriction 18.
- the second bleed connection 29 may be located in a portion of the exhaust system downstream of the restricting element 30 whilst the second conduit port 25 may be located in a portion of the exhaust passage 16 upstream of the restricting element 30. It is to be understood that the restricting element 30 may be omitted.
- first and second bleed connections 27 and 29 may actually be fluidly connected together such that the first and the second bleed passages 26 and 28 are merged.
- any of the first conduit port 23, the second conduit port 25, the fist bleed connection 27 and the second bleed connection 29 may be located as suitable.
- the system will be described as being operational as an EGR loop with the exhaust passage 16 being fluidly connectable to an intake portion of the engine.
- exhaust gas produced by combustion engine 14 may flow through the exhaust passage 16 and through restriction 18, which in this case may be regarded as an EGR valve.
- the restriction 18 may be controlled to regulate the amount of EGR and may even be closed fully.
- the exhaust system 12 being a portion of an EGR loop it may be desirable to determine various gas pressure related parameters upstream and downstream of the restriction 18 to aid in determining or estimating the EGR mass flow.
- first and second conduits 22 and 24 may enable the first and second sensing portions 20a and 20b to be located remotely from the exhaust passage 16. Gas flowing through the exhaust passage 16 will act on the remote first and second sensing portions 20a and 20b. As without the first and/or second bleed passages 26, 28 the first and second conduits 22 and 24 are basically dead ends, the flow of gas may stagnate to an extent in the first and second conduits 22 and 24.
- first bleed passage 26 extending between the first conduit 22 and a first bleed connection 27 for fluidly connecting the first bleed passage 26 with another portion of the exhaust system 12 enables a substantially continuous flow of exhaust gas through at least a portion of the first conduit 22.
- second bleed passage 28 extending between the second conduit 24 and a second bleed connection 29 for fluidly connecting the second bleed passage 28 with another portion of the exhaust system 12 enables a substantially continuous flow of exhaust gas through at least a portion of the second conduit 24.
- first and second conduits 22 and 24 By changing the flow characteristics through at least portions of the first and second conduits 22 and 24, build up of deposits or the forming of condensation in the first and second conduits 22 and 24 and especially near the first and second conduit ports 23 and 25 may be reduced.
- existing pressure differentials upstream and downstream of the first and second conduit ports 23 and 25 predominant flow directions can be achieved. For example, by fluidly connecting the first bleed passage 26 to a portion of the exhaust system 12 where a relatively higher exhaust gas pressure exists than in the first conduit 22, any gas flow will then predominantly take place from the first bleed connection 27, through the first bleed passage 26, through at least a portion of the first conduit 22 and subsequently through the first conduit port 23.
- first conduit 22 and the first bleed passage 26 may be located relatively close to the first conduit port 23, e.g. within 50 or even within 25 millimeters from the first conduit port 23. This of course applies equally to the second conduit 24, the second conduit port 25 and the second bleed passage 28.
- At least one of the fluid connections between the first conduit 22 and the first bleed passage 26, and between the second conduit 24 and the second bleed passage 28 may be located adjacent the associated sensing portion 20a and 20b respectively.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust-Gas Circulating Devices (AREA)
Abstract
An exhaust system (12) for a combustion engine (14) comprising an exhaust passage (16) having a first conduit port (23) and a first sensing portion (20a) configured to determine a parameter related to a pressure of exhaust gas in the exhaust passage, the first sensing portion (20a) being remote from the exhaust passage (16). A first conduit (22) extends between the first sensing portion (20a) and the first conduit port (23) for fluidly connecting the first sensing portion (20a) with the exhaust passage (16). A first bleed passage (26) extends between the first conduit (22) and a first bleed connection (27) for fluidly connecting the first bleed passage (26) with another portion of the exhaust system (12) enabling a substantially continuous flow of exhaust gas through at least a portion of the first conduit (22).
Description
- The present disclosure relates generally to an exhaust system.
- Exhaust gas systems for power units such as internal combustion engines nowadays tend to be of increasingly complex arrangements involving multiple sub-systems and components for emission control such as exhaust gas recirculation (EGR) arrangements and aftertreatment arrangements. Exhaust gas is inherently dirty and potentially aggressive as it contains many constituents, including water, that together and potentially with other additional chemicals (such as for example urea) can form deposits in the systems thereby reducing or halting proper operation of the various components and/or systems. The current disclosure is aimed at alleviating some of such problems.
- The present disclosure details an exhaust system for a combustion engine comprising an exhaust passage having a first conduit port, a first sensing portion configured to determine a parameter related to a pressure of exhaust gas in the exhaust passage, the first sensing portion being remote from the exhaust passage. Furthermore, a first conduit extends between the first sensing portion and the first conduit port for fluidly connecting the first sensing portion with the exhaust passage and a first bleed passage extends between the first conduit and a first bleed connection for fluidly connecting the first bleed passage with another portion of the exhaust system enabling a substantially continuous flow of exhaust gas through at least a portion of the first conduit.
-
- Fig. la is a schematic illustration of an exemplary exhaust system embodiment having at least one sensing portion according to the present disclosure.
- Fig. lb is a schematic illustration of a variant of the embodiment of Fig. la.
-
Fig. 2a is an schematic illustration of an expanded variant of the embodiment ofFig. 1 a. -
Fig. 2b is a schematic illustration of a variant of the embodiment ofFig. 2a . -
Fig. 3 is a schematic illustration of an exemplary exhaust system embodiment having at least two sensing portions according to the present disclosure. -
Fig. 4 is a schematic illustration of a variant ofFig. 3 . -
Fig. 5 is a schematic illustration of an exemplary exhaust system embodiment having at least two sensing portions with a single bleed line. -
Fig. 6 is a is a schematic illustration of an exemplary exhaust system embodiment having two sensing portions as part of the same sensor. -
Figs. 1 to 6 are schematic illustrations of exemplary embodiments of asensing arrangement 10 for anexhaust system 12 of acombustion engine 14 such as for example an internal combustion engine. Anexhaust passage 16 may be fluidly connected to thecombustion engine 14 to conduct exhaust gasses. In one embodiment theexhaust passage 16 may for example be an exhaust gas recirculation (EGR) passage to conduct exhaust gasses from an exhaust portion of thecombustion engine 14 to an intake portion of thecombustion engine 14. In one embodiment theexhaust passage 16 may additionally or alternatively be conducting exhaust gas from or to an aftertreatment arrangement and/or to the environment. - In one embodiment the
sensing arrangement 10 may include afirst sensing portion 20a. In another embodiment the sensing arrangement may include at least afirst sensing portion 20a and asecond sensing portion 20b. Thesensing arrangement 10 may be configured to determine parameters relating to an exhaust gas pressure. The first and second sensingportions portions -
First sensing portion 20a may be remote from theexhaust passage 16 and may be fluidly connected to theexhaust passage 16 via afirst conduit 22. The fluid connection of thefirst conduit 22 with theexhaust passage 16 will from hereon be referred to asfirst conduit port 23. Similarly, second sensingportion 20b may be remote from theexhaust passage 16 and may be fluidly connected to theexhaust passage 16 via asecond conduit 24. The fluid connection of thesecond conduit 24 with theexhaust passage 16 will from hereon be referred to assecond conduit port 25. - A first bleed
passage 26 may extend from thefirst conduit 22 to a portion of theexhaust system 12 to fluidly connect them together. The fluid connection of the firstbleed passage 26 with the portion of theexhaust system 12 it fluidly connects to will from hereon be referred to as the firstbleed connection 27. In one embodiment the firstbleed passage 26 may extend from thefirst conduit 22 to theexhaust passage 16 and the first bleedconnection 27 is then the fluid connection between the first bleedpassage 26 and theexhaust passage 16. - Similarly, a second
bleed passage 28 may extend from thesecond conduit 24 to a portion of theexhaust system 12 to fluidly connect them together. The fluid connection of the second bleedpassage 28 with the portion of theexhaust system 12 it fluidly connects to will from hereon be referred to as the secondbleed connection 29. In one embodiment the secondbleed passage 28 may extend from thesecond conduit 24 to theexhaust passage 16 and the second bleedconnection 29 is then the fluid connection between the secondbleed passage 28 and theexhaust passage 16. - It is to be understood that the first and/or second
bleed passages exhaust passage 16 such that the flow through the first and/or secondbleed passages exhaust passage 16. - The
exhaust passage 16 may have arestriction 18 therein, dividing theexhaust passage 16 in anupstream portion 16a and adownstream portion 16b. In one embodiment therestriction 18 may be a restrictor having a fixed cross-sectional opening such as for example a fixed venturi. In another embodiment therestriction 18 may have a variable cross-sectional opening therethrough such as for example a valve arrangement including a moveable valve member. - The location of the first bleed
connection 27 and/or the second bleedconnection 29 in the exhaust system may be chosen as suitable. For example the first bleedconnection 27 may be located onupstream portion 16a, ondownstream portion 16b, on a portion of theexhaust passage 16 upstream of thefirst conduit port 23 or on a portion of theexhaust passage 16 downstream of thefirst conduit port 23. The second bleedconnection 29 may be located onupstream portion 16a, ondownstream portion 16b, on a portion of theexhaust passage 16 upstream of thesecond conduit port 25 or on a portion of theexhaust passage 16 downstream of thesecond conduit port 25. -
Figs. 3 and 4 show exemplary embodiments in which an additional restrictingelement 30 may be present in the exhaust passage. The restrictingelement 30 may be anything that provides resistance to the gas flow and may for example include a components such as a turbocharger or a valve, but may also be a just a bend or narrowing in the conduit for example. The characteristic of the restrictingelement 30 is that the gas flow therethrough is restricted such that there is a gas pressure differential across the restrictingelement 30. - As best seen in
Fig. 3 in one embodiment the firstbleed connection 27 may be located in a portion of theexhaust passage 16 upstream of the restrictingelement 30 whilst thefirst conduit port 23 is located in a portion of theexhaust passage 16 downstream of the restrictingelement 30. The second bleedconnection 29 may be located in a portion of the exhaust system upstream of therestriction 18 whilst thesecond conduit port 25 is located in a portion of theexhaust passage 16 downstream of therestriction 18. It is to be understood that the restrictingelement 30 may be omitted. - As best seen in
Fig. 4 , in one embodiment the firstbleed connection 27 may be located in a portion of theexhaust passage 16 downstream of therestriction 18 whilst thefirst conduit port 23 maybe located in a portion of theexhaust passage 16 upstream of therestriction 18. The second bleedconnection 29 may be located in a portion of the exhaust system downstream of the restrictingelement 30 whilst thesecond conduit port 25 may be located in a portion of theexhaust passage 16 upstream of the restrictingelement 30. It is to be understood that the restrictingelement 30 may be omitted. - As best seen in
Figs. 5 and 6 , the first and secondbleed connections bleed passages - It is to be understood that the aforementioned embodiments are exemplary only and not intended to be limiting. Individually, or as part of a combination, any of the
first conduit port 23, thesecond conduit port 25, the fist bleedconnection 27 and the second bleedconnection 29 may be located as suitable. For example, it may be desirable to have exhaust gas flow predominantly from the first bleedpassage 26 to the first bleedconnection 27 or vice versa. Similarly, it may be desirable to have exhaust gas flow predominantly from the second bleedpassage 28 to the second bleedconnection 29 or vice versa. - For exemplary purposes only the system will be described as being operational as an EGR loop with the
exhaust passage 16 being fluidly connectable to an intake portion of the engine. During operation of the EGR loop exhaust gas produced bycombustion engine 14 may flow through theexhaust passage 16 and throughrestriction 18, which in this case may be regarded as an EGR valve. Therestriction 18 may be controlled to regulate the amount of EGR and may even be closed fully. In the example of theexhaust system 12 being a portion of an EGR loop it may be desirable to determine various gas pressure related parameters upstream and downstream of therestriction 18 to aid in determining or estimating the EGR mass flow. However, it may be undesirable or just not practical to have the first and/orsecond sensing portions exhaust passage 16 and therefore the first andsecond conduits second sensing portions exhaust passage 16. Gas flowing through theexhaust passage 16 will act on the remote first andsecond sensing portions second bleed passages second conduits second conduits first bleed passage 26 extending between thefirst conduit 22 and afirst bleed connection 27 for fluidly connecting thefirst bleed passage 26 with another portion of theexhaust system 12 enables a substantially continuous flow of exhaust gas through at least a portion of thefirst conduit 22. Similarly, providing asecond bleed passage 28 extending between thesecond conduit 24 and asecond bleed connection 29 for fluidly connecting thesecond bleed passage 28 with another portion of theexhaust system 12 enables a substantially continuous flow of exhaust gas through at least a portion of thesecond conduit 24. - By changing the flow characteristics through at least portions of the first and
second conduits second conduits second conduit ports second conduit ports first bleed passage 26 to a portion of theexhaust system 12 where a relatively higher exhaust gas pressure exists than in thefirst conduit 22, any gas flow will then predominantly take place from thefirst bleed connection 27, through thefirst bleed passage 26, through at least a portion of thefirst conduit 22 and subsequently through thefirst conduit port 23. Of course the reverse order applies when the exhaust gas pressure in thefirst conduit 22 is relatively higher than the exhaust gas pressure at thefirst bleed connection 27. It may for example be preferred to have the flow directed in such a manner to move any deposits away from thefirst sensing portion 20a rather than towards it. Of course this equally applies to the portion of the system including thesecond sensing portion 20b, thesecond bleed connection 29 and its associatedsecond bleed passage 28. - In situations where fouling and/or condensation issues tend to mainly concentrate near the
first conduit port 23, the fluid connection betweenfirst conduit 22 and thefirst bleed passage 26 may be located relatively close to thefirst conduit port 23, e.g. within 50 or even within 25 millimeters from thefirst conduit port 23. This of course applies equally to thesecond conduit 24, thesecond conduit port 25 and thesecond bleed passage 28. - In one embodiment at least one of the fluid connections between the
first conduit 22 and thefirst bleed passage 26, and between thesecond conduit 24 and thesecond bleed passage 28 may be located adjacent the associatedsensing portion - It will be apparent to those skilled in the art that various modifications and variations can be made in the disclosed linkage arrangement. Other embodiments will be apparent to those skilled in the art from consideration of the specification and practice of the disclosed embodiments herein. It is intended that the specification and examples be considered as exemplary only, with a true scope of the disclosure being indicated by the following claims.
Claims (15)
- An exhaust system (12) for a combustion engine (14) comprising:an exhaust passage (16) having a first conduit port (23);a first sensing portion (20a) configured to determine a parameter related to a pressure of exhaust gas in the exhaust passage, the first sensing portion (20a) being remote from the exhaust passage (16);a first conduit (22) extending between the first sensing portion (20a) and the first conduit port (23) for fluidly connecting the first sensing portion (20a) with the exhaust passage (16);a first bleed passage (26) extending between the first conduit (22) and a first bleed connection (27) for fluidly connecting the first bleed passage (26) with another portion of the exhaust system (12) enabling a substantially continuous flow of exhaust gas through at least a portion of the first conduit (22).
- An exhaust system (12) according to claim 1, further including
a restriction (18) in the exhaust passage (16);
a second conduit port (25) in the exhaust passage (16);
a second sensing portion (20b) configured to determine a parameter related to a pressure of exhaust gas in the exhaust passage (16), the second sensing portion (20b) being remote from the exhaust passage (16);
a second conduit (24) extending between the second sensing portion (20b) and the second conduit port (25) for fluidly connecting the second sensing portion (20b) with the exhaust passage (16);
a second bleed passage (28) extending between the second conduit (24) and a second bleed connection (29) for fluidly connecting the second bleed passage (28) with another portion of the exhaust system (12) enabling a substantially continuous flow of exhaust gas through at least a portion of the second conduit (24) wherein the first conduit port (23) is located in a portion of the exhaust passage ( 16a) upstream of the restriction (18) and the second conduit port (25) is located in a portion of the exhaust passage (16b) downstream of the restriction (18). - An exhaust system (12) according to claim 2 wherein said first and second sensing portions (20a, 20b) are portions of a single Δp sensor.
- An exhaust system (12) according to claim 2 wherein the first sensing portion (20a) is a first pressure sensor and the second sensing portion (20b) is a second pressure sensor.
- An exhaust system (12) according to any of the preceding claims wherein the restriction (18) is a venturi.
- An exhaust system (12) according to any of claims 1 to 4, wherein the restriction (18) is an EGR valve.
- An exhaust system (12) according to any of claims 2 to 6, wherein the first and second bleed connections (27, 29) are fluidly connected to each other.
- An exhaust system (12) according to any of the preceding claims, wherein at least one of the first and second bleed connections (27, 29) is located in the exhaust system (12) such that exhaust gas tends to flow predominantly from the bleed passage (26, 28) to the associated bleed connection (27,29).
- An exhaust system (12) according to any of the preceding claims, wherein at least one of the first and second bleed connections (27, 29) is located in the exhaust system (12) such that exhaust gas tends to flow predominantly from the bleed connection (27, 29) to the associated bleed passage (26, 28).
- An exhaust system (12) according to any of claims 2 to 6 wherein both the first and second bleed connections (27, 29) are located in a portion of the exhaust passage ( 16a) upstream of the restriction (18).
- An exhaust system (12) according to any of claims2 to 6 wherein both the first and second bleed connections (27, 29) are located in a portion of the exhaust passage (16b) downstream of the restriction (18).
- An exhaust system (12) according to any of the preceding claims, wherein at least one of the fluid connections a) between the first conduit (22) and the first bleed passage (26) and b) between the second conduit (24) and the second bleed passage (28) is located within 50 millimeters from the first conduit port (23).
- An exhaust system (12) according to any of the preceding claims, wherein at least one of the fluid connections between a) between the first conduit (22) and the first bleed passage (26) and b) between the second conduit (24) and the second bleed passage (28) is located within 25 millimeters from the first conduit port (23).
- An exhaust system (12) according to any of claims 1 to 11, wherein at least one of the fluid connections a) between the first conduit (22) and the first bleed passage (26) and b) between the second conduit (24) and the second bleed passage (28) is located adjacent the associated sensing portion (20a, 20b)
- An exhaust system (12) according to any of the preceding claims wherein at least one of the first and second bleed passages (26, 28) includes a portion having a small cross-sectional diameter relative to the exhaust passage (16) such that any flow through the at least one of the first and second bleed passages (26, 28) is little or insignificant compared through the flow flowing through the exhaust passage (16).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP10015613A EP2466088A1 (en) | 2010-12-14 | 2010-12-14 | Exhaust system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP10015613A EP2466088A1 (en) | 2010-12-14 | 2010-12-14 | Exhaust system |
Publications (1)
Publication Number | Publication Date |
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EP2466088A1 true EP2466088A1 (en) | 2012-06-20 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP10015613A Withdrawn EP2466088A1 (en) | 2010-12-14 | 2010-12-14 | Exhaust system |
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Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20010054309A1 (en) * | 2000-06-27 | 2001-12-27 | Honda Giken Kogyo Kabushiki Kaisha | Exhaust gas characteristic detecting apparatus for internal combustion engine |
US20050005773A1 (en) * | 2003-07-11 | 2005-01-13 | Shutty John V. | Arrangement for mounting electrical components to an aftertreatment filter |
JP2006063801A (en) * | 2004-08-24 | 2006-03-09 | Mitsubishi Motors Corp | Exhaust emission control device for internal combustion engine |
-
2010
- 2010-12-14 EP EP10015613A patent/EP2466088A1/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20010054309A1 (en) * | 2000-06-27 | 2001-12-27 | Honda Giken Kogyo Kabushiki Kaisha | Exhaust gas characteristic detecting apparatus for internal combustion engine |
US20050005773A1 (en) * | 2003-07-11 | 2005-01-13 | Shutty John V. | Arrangement for mounting electrical components to an aftertreatment filter |
JP2006063801A (en) * | 2004-08-24 | 2006-03-09 | Mitsubishi Motors Corp | Exhaust emission control device for internal combustion engine |
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