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
  • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
  • F01N3/005—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for draining or otherwise eliminating condensates or moisture accumulating in the apparatus
• • 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
  • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
• • 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
  • 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
  • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
  • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
  • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
  • B01D46/0084—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours provided with safety means
  • B01D46/0086—Filter condition indicators
• • 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
  • F01N2470/00—Structure or shape of gas passages, pipes or tubes
• • 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
  • F01N2470/00—Structure or shape of gas passages, pipes or tubes
  • F01N2470/02—Tubes being perforated
• • 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
  • F01N2470/00—Structure or shape of gas passages, pipes or tubes
  • F01N2470/08—Gas passages being formed between the walls of an outer shell and an inner chamber
• • 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
• • 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
  • F01N2560/14—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics having more than one sensor of one kind
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
  • Y02T10/00—Road transport of goods or passengers
  • Y02T10/10—Internal combustion engine [ICE] based vehicles
  • Y02T10/12—Improving ICE efficiencies

Definitions

• the present invention relates to an arrangement for measuring a differential pressure over a particulate filter assembly having a particulate filer inside a tube arranged in a flow path of exhaust gases from a combustion engine, the arrangement comprising a first pipe connected to said flow path at an inlet thereof to the particulate filter assembly at one end of the assembly, a second pipe connected to said flow path at an outlet thereof from the particulate filter assembly at one end of the assembly, and a pressure sensor to which the pipes are connected and which is configured to measure a difference of the pressures in the flow path at said inlet and said outlet.
• the invention relates to such arrangements for measuring a differential pressure over a particulate filter assembly arranged in a flow path of exhaust gases from a combustion engine for any type of use, such as industrial applications, in grinding machines and all types of motor vehicles, although the invention is particularly applicable to motor vehicles and especially wheeled utility vehicles, such as trucks or lorries and buses. This is the reason for mainly discussing the invention for this particular use without for that sake restricting it thereto.
• the reason for having an arrangement for measuring a differential pressure over a particulate filter assembly is that the particulate filter assembly will after a certain time of operation of the combustion engine be that filled with particles that it has to be regenerated by increasing the temperature of the exhaust gases and burning the particles collected in the particulate filter assembly. The value of said differential pressure will tell when such regeneration is to take place.
• connections of the first and second pipes to said flow path may be located too far from each other to facilitate a good drainage of condensate water, which may eventually cause the water to freeze and obstruct the pressure sensor function .
• This problem exists when said combustion engine may be used where a low temperature may prevail, especially when the combustion engine is arranged in a motor vehicle used in regions where a cold climate may occur.
• EP 1 598 533 A2 discloses an arrangement according to the introduction which has long pipes leading to a pressure sensor with an inherent risk of obstruction due to freezing water in case of using the combustion engine with particulate filter assembly in a cold environment. Thus, it should be aimed at obtaining a compact installation of the differential pressure sensor and the particulate filter assembly to be monitored thereby. However, if the particulate filter assembly is long this has a tendency to cause the pipes to have a small slope to keep the installation compact having a negative impact on the condensate water drainage behavior of the pipes.
• the object of the present invention is to provide an arrangement of the type defined in the introduction addressing the problems disclosed above.
• the pressure sensor is configured to be arranged at a location along the particulate filter assembly, both pipes are configured to project from the particulate filter assembly at this location, and the arrangement comprises at least one channel opening into the flow path at one end of the particulate filter assembly and extending on the outside of the particulate filter assembly tube to one of the pipes projecting from the particulate filter assembly at a distance from this one end while the channel is enclosed between the tube and a heat insulating member outside thereof.
• the pressure sensor is configured to be arranged at said location at a first of said ends of the particulate filter assembly, and said channel opens into said flow path at a second end of the particulate filter assembly opposite to the first end and this channel extends on the outside of the particulate filter assembly tube towards the first end to one of the pipes while being enclosed between said tube and the heat insulating member outside thereof.
• the pressure sensor is configured to be arranged at the inlet to the particulate filter assembly, and said channel extends from the outlet from the particulate filter assembly to said second pipe.
• said pipes are configured to project from the particulate filter assembly in a direction making an angle > 30° with a horizontal plane in a state of a normal position assumed by the particulate filter assembly.
• Such a direction of the extension of the pipes provides for good possibilities to efficiently drain condensate water contained in the pipes.
• “Normal position” is here for a particulate filter assembly arranged in a motor vehicle the position assumed thereby when the vehicle is resting on horizontal ground.
• said pipes are configured to project form the particulate filter assembly in a direction making an angle of 85°-95°, substantially 90° or 90° with a horizontal plane in a state of a normal position assumed by the particulate filter assembly.
• a direction of the extension of the pipes is advantageous for the reasons just mentioned, and this is especially the case when combined with another embodiment of the invention in which the pipes are configured to be arranged to project from the particulate filter assembly tube upwards while making said angle with a horizontal plane in a state of a normal position assumed by said particulate filter assembly.
• a normal position will be defined as the position assumed when the vehicle is standing on horizontal ground .
• said pipes are configured to project from the particulate filter assembly substantially in parallel with each other or in parallel with each other.
• said channel has an elongated cross section with a width having an arc-like extension circumferentially with respect to the particulate filter assembly tube and exceeding the height thereof which extends radially with respect to a center axis of the particulate filter assembly tube.
• the arrangement is configured to measure a differential pressure over a particulate filter assembly arranged in a flow path of exhaust gases from a combustion engine of a motor vehicle, which constitutes a particularly preferred use of an arrangement according to the present invention, in particular when the motor vehicle is to be used in cold environments.
• the invention also relates to the use of an arrangement for measuring a differential pressure over a particulate filter assembly in a motor vehicle, a vehicle particulate filter assembly as well as a motor vehicle proved with such an arrangement according to the appended patent claims directed thereto.
• Fig. 1 illustrates very schematically a combustion engine having an exhaust gas system provided with a particulate filter assembly to which an arrangement for measuring the differential pressure over this particulate filter assembly is to be arranged
• Fig. 2 is a partially sectioned view of a part of a particulate filter assembly provided with an arrangement according to a first embodiment of the invention
• Fig 3 is a cross-section view of the embodiment shown in Fig 2 at Ill-Ill with the pressure sensor symbolized in Fig 2 omitted
• Fig. 4 is a view similar to that of Fig. 2 showing an arrangement according to a second embodiment of the invention.
• Fig. 1 is a very simplified view showing how an arrangement for measuring differential pressure over a particulate filter assembly 1 having a particulate filter 20 inside a tube arranged in a flow path 2 of exhaust gases from a combustion engine 3 in a motor vehicle
• This arrangement has a first pipe 5 connected to said flow path at an inlet 6 thereof to the particulate filter assembly, a second pipe 7 connected to the flow path at an outlet 8 thereof from the particulate filter assembly and a pressure sensor 9 to which the pipes 5, 7 are connected and which is configured to measure a difference of the pressures in the flow path at said inlet 6 and outlet 8.
• Figs. 2 and 3 illustrate the design of an arrangement of the type shown in Fig. 1 according to a first embodiment of the invention, in which the pressure sensor 9 is arranged at a location at a first end 10 of the particulate filter assembly at the inlet 6 thereto.
• the first 5 and second 7 pipes are short pipes, but may also be considerably longer than shown, such as twice, extending vertically from the particulate filter assembly to the pressure sensor and accordingly both arranged at said first end 10 of the particulate filter assembly.
• a channel 1 1 opens into the flow path at the outlet 8 from the particulate filter assembly at a second end 14 thereof and extends on the outside of the particulate filter assembly tube to the second pipe 7 while being enclosed between the particulate filter assembly tube 12 and a heat insulating member 13 outside thereof.
• This channel 1 1 has an elongated cross-section with a width having an arc-like extension circumferentially with respect to the particulate filter assembly tube and exceeding the height thereof which extends radially with respect to the center axis of the particulate filter assembly tube.
• the difference of the pressures at the inlet 6 and the outlet 8 of the particulate filter assembly may by this be determined by the connection of the two pipes 5, 7 to the pressure sensor 9, and the limited length of these pipes and the vertical extension thereof will result in a good drainage of condensate water and a very low risk of freezing of such water therein.
• Any condensate water inside the channel will efficiently be evaporated by the high temperatures prevailing therein thanks to the enclosure thereof between the particulate filter assembly conducting hot exhaust gases and said heat insulating member.
• Condensate water produced in the pipes will be drained or evaporated before freezing after turning the combustion engine off thanks to the slowly decreasing temperature of the porous media 20 inside the particulate filter assembly after turning off the engine.
• FIG. 4 shows the application of an arrangement according to a second embodiment of the invention on a particulate filter assembly, and this arrangement differs from the embodiment shown in Fig. 2 only by having the two pipes and the pressure sensor located at the second end 14 of the particulate filter assembly resulting in a channel 1 1 connecting the first pipe 5 to the inlet 6 of the flow path to the particulate filter assembly.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Analytical Chemistry (AREA)
• Processes For Solid Components From Exhaust (AREA)
• Measuring Fluid Pressure (AREA)
• Filtering Of Dispersed Particles In Gases (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=69949726

Family Applications (1)

Country Status (4)

Cited By (1)

Citations (3)

• 2018
  • 2018-09-28 SE SE1851163A patent/SE544698C2/en unknown
• 2019
  • 2019-09-24 BR BR112021005256-9A patent/BR112021005256A2/pt unknown
  • 2019-09-24 DE DE112019004151.7T patent/DE112019004151T5/de active Pending
  • 2019-09-24 WO PCT/SE2019/050912 patent/WO2020067974A1/en active Application Filing

Patent Citations (3)

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