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
  • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
  • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
  • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
  • F01N3/28—Construction of catalytic reactors
  • F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
• • 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
  • F01N13/009—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 having two or more separate purifying devices arranged in series
• • 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
  • F01N13/009—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 having two or more separate purifying devices arranged in series
  • F01N13/0093—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 having two or more separate purifying devices arranged in series the purifying devices are of the same type
• • 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
  • F01N13/011—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 having two or more purifying devices arranged in parallel
• • 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
  • F01N3/033—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 in combination with other devices
  • F01N3/035—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 in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
• • 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
  • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
  • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
  • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
  • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
  • F01N3/2053—By-passing catalytic reactors, e.g. to prevent overheating
• • 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
  • F01N2410/00—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device
• • 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
  • F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas 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

Definitions

• the invention relates to an exhaust system for use with an engine system and, in particular, relates to an exhaust system for a dual fuel engine system.
• EU regulations require engine emissions to meet particular standards in terms of the types and quantities of gases emitted.
• Engine emissions depend on may factors including the type and amount of fuel injected into the engine for combustion, and post combustion gas treatment.
• an exhaust system for an engine system comprising a pipe system having at least one input port for receiving exhaust gases from the engine system and at least one output port for venting exhaust gases from the exhaust system
• the pipe system includes at least two exhaust routes for flow of gases from the one or more input ports to the one or more output ports
• a diverter valve operable in response to a control input to control the flow of exhaust gases through the pipe system through one or more of the exhaust routes
• the diverter valve comprising at least two butterfly valve members, each butterfly valve member controlling the flow of exhaust gases via one of said exhaust routes, each member having an input face and an output face, at least one input face comprising input disrupting means for disrupting the flow of exhaust gases emitted from the engine system.
• input face and output face used to describe the butterfly valve members, refer to the orientation of the faces of the butterfly valve member when that member is in the closed position.
• input face which face has been described as the input face
• output face which face has been described as an output face.
• a diverter valve provides an effective arrangement for enabling the efficiency and effectiveness of a particular exhaust gas management system to be assessed. This is because the diverter valve enables the flow of exhaust gases from an engine to be directed along one of at least two exhaust routes. It is therefore possible to compare the efficiency and effectiveness of at least two exhaust arrangements using the same engine. This enables a more accurate and consistent comparison of the two arrangements to be made. For example, it is possible to compare an exhaust arrangement including a catalyst treatment system with an exhaust arrangement excluding a catalyst, or to directly compare the efficiency of different catalysts.
• the provision of the diverter valve in the pipe system also enables effective measurements to be made by diverting the exhaust gases to a sensor chamber without affecting the flow of exhaust gases through the exhaust system.
• the input disrupting means creates disruption in the flow of exhaust gases, and thus disrupts laminar exhaust gas flow. Further, the disruption of laminar flow allows the exhaust gases to expand which results in a more even distribution of exhaust gases.
• the disruption means may cause either turbulence in the exhaust gases, or may induce a swirling motion in the exhaust gases.
• a turbulent flow is generally regarded as being fluid flow in which the particle motion of the fluid at any point varies rapidly in magnitude and direction. This results in irregular eddy motion.
• a swirling motion is one in which the particle motion is substantially helical, and will have either a clockwise or counter-clockwise sense.
• the diverter valve causes a more even distribution of exhaust gases over the exposed face of the catalyst.
• the input disrupting means comprises one or more blades formed on the at least one input face.
• the diverter comprises walls associated with each butterfly member, the walls associated with at least one of the butterfly members being convex.
• the convex walls form a venturi, and in combination with the disruptive means further improves the even distribution of exhaust gases across the face of a catalyst positioned in one of the exhaust routes, thereby improving the efficiency of the catalytic conversion.
• At least one output face comprises outputdisrapting means for creating turbulence in exhaust gases.
• the output disrupting means comprises one or more blades formed on the at least one output face.
• a diverter valve comprising at least two butterfly valve members, each member having a first face, and an opposite face, at least one of the first faces comprising disrupting means for disrupting the flow of fluids passing through the valve.
• an engine system including an engine, and an exhaust system comprising a pipe system having at least one input port for receiving exhaust gases from the engine system and at least one output port for venting exhaust gases from the exhaust system wherein the pipe system includes at least two exhaust routes for flow of gases from the one or more input ports to the one or more output ports, and further includes a diverter valve operable in response to a control input to control the flow of exhaust gases through the pipe system through one or more of the exhaust routes, the diverter valve comprising at least two butterfly valve members, each butterfly valve member controlling the flow of exhaust gases via one of said exhaust routes, each member having an input face and an output face, at least one input face comprising input disrupting means for disrupting the flow of exhaust gases emitted from the engine system.
• Figure 1 is a schematic illustration of an exhaust system according to an embodiment of the invention
• FIG. 2 is a schematic illustration of an exhaust system according to another embodiment of the invention.
• Figure 3 is a schematic illustration of an exhaust system according to a yet further embodiment of the invention.
• Figures 4a-4d show a diverter valve of the exhaust systems of Figures 1-3.
• FIGS 5, 6a and 6b illustrate a diverter valve forming part of the invention.
• the exhaust system 10 includes a pipe system 12 connected to the exhaust of an engine 14.
• the pipe system 12 includes two input ports 15,16 for receiving exhaust gases from the engine 14.
• the pipe system also includes an output port 18 for venting exhaust gases from the exhaust system 10.
• One of the input ports 15 of the pipe system 12 is defined by one end of a catalyst treatment system 20.
• the catalyst treatment system 20 includes a pre-catalyst 22 and a main catalyst 24 connected in series.
• the catalyst treatment system 20 defines a first exhaust route A through the pipe system 12 for exhaust gases from the engine 14, and is connected at its other end to an input pipe 26 of a diverter valve 28.
• the other of the input ports 16 of the pipe system 12 is defined by one end of a bypass pipe 30.
• the bypass pipe 30 defines a second exhaust route B through the pipe system 12 for exhaust gases from the engine 14, and is connected at its other end to a second input pipe 32 of the diverter valve 28.
• the two input pipes 26,32 of the diverter valve 28 merge into a single output pipe 34.
• Each of the input pipes 26,32 includes a butterfly valve member 36 defined by a circular disc 38 ( Figures 4a and 4b) pivotally mounted within the respective pipe 26,32 such that it is movable between an open position 0 P and a closed position 0 ⁇
• Each of the circular discs 38 corresponds in diameter to the internal diameter of the respective pipe 26,32 such that when the butterfly valve member 36 is moved to its closed position O c , it blocks the flow of gas through the pipe.
• the butterfly valve members 36 are pivotally mounted on a common spindle 40 at an angle of 90° to each other. This ensures that when one of the valve members 36 is in its open position 0 P , the other of the valve members 36 is in its closed position O c , thereby ensuring that one of the valve members 36 is always open. Failure of the engine system, through blockage of the flow of exhaust gases through the exhaust system 10, is thereby prevented.
• the spindle 40 is rotatably mounted in the body 42 of the diverter valve 28 defined by the input and output pipes 26,32,34, and is connected to a solenoid 44 mounted on the body 42 (see Figures 4c and 4d) to control rotation of the spindle 40 in the body 42.
• the solenoid 44 is preferably controlled by a switch (not shown) such as, for example, an electronic switch.
• the switch may be operated directly, or it may include a receiver (not shown) to receive signals from a transmitter and permit control of the switch, and therefore the solenoid 44, from a remote location.
• the exhaust route A,B taken by exhaust gases from the engine 14, through the pipe system 12, is determined by the relative orientation of the butterfly valve members 36 in the diverter valve 28.
• the output pipe 34 of the diverter valve 28 is connected to an input pipe 45 of a continuously regenerating trap 46, which in turn is connected to an exhaust outlet pipe 48 defining the output port 18 of the pipe system 12.
• the continuously regenerating trap 46 separates non-compliant emission particulates from exhaust gases passing therethrough.
• An exhaust gas sensor 50a,50b is preferably provided in the bypass pipe 30 and in the catalyst treatment system 20, downstream of the main catalyst 24, to identify and measure the quantities of one or more gases in the exhaust gases.
• the type of sensor 50a,50b installed in the bypass pipe 30 and the catalyst treatment system 20 is determined by the fuel used in the engine 14 connected to the exhaust system 10.
• the sensor 50a,50b is preferably a methane sensor to determine the quantity of methane contained in the exhaust gases.
• a sensor 50a,50b in each of the exhaust routes A,B provides means for analyzing exhaust gases passing through each of the routes, and thereby permits comparative measurements to be made. It therefore enables the efficiency and effectiveness of the catalyst treatment system 20 to be compared with that of a simple bypass pipe 30 having no catalyst.
• the diverter valve 28 will permit comparison of the two routes under different engine loading conditions simply by operating the solenoid 44 to vary the exhaust route A,B through the pipe system 12 which is taken by exhaust gases emitted by the engine 14.
• the exhaust gas outlet pipe 48 preferably includes an exhaust gas sensor 52.
• the particular type of sensor 52 installed in the exhaust gas outlet pipe 48 is determined by the fuel used in the engine 14 connected to the exhaust system 10.
• the sensor 52 is preferably a methane sensor to determine the quantity of methane contained in the exhaust gases.
• the sensors 50a,50b,52 provided in the exhaust system 10 may include transmitters which permit the sensors 50a,50b,52 to transmit measurements to a central control unit (not shown).
• the control unit may then use the measurements to control the diverter valve 28 and/or control the fuel injection in the engine 14.
• the diverter valve 28 may be reversed and positioned between the engine 14 and the exhaust routes A,B.
• the exhaust of engine 14 is connected to pipe 34 of the diverter valve 28
• the catalyst treatment system 20 is connected to pipe 26
• the bypass pipe 30 is connected to pipe 32.
• Both the catalyst treatment system 20 and the bypass pipe 30 are connected at their other ends to the input pipe 45 of the continuous regenerating trap 46.
• the relative positions of the butterfly valve members 36 in the diverter valve 28 determine which exhaust route A,B is taken by exhaust gases emitted by the engine 14.
• An exhaust system 60 according to another embodiment of the invention is shown in Figure 2. The same reference numerals are used to identify parts similar to those described with reference to Figure 1.
• the exhaust system 60 includes a pipe system 12 connected to the exhaust of an engine 14.
• the pipe system 12 includes a single input port 115 for receiving exhaust gases from the engine 14.
• the pipe system 12 also includes an output port 18 for venting exhaust gases from the exhaust system 60.
• the input port 115 of the pipe system 12 is defined by an input pipe 34 of the diverter valve 28.
• the input pipe 34 of the diverter valve 28 splits to form two output pipes 26,32.
• One of the output pipes 26 is connected to one end of a catalyst treatment system 120 including a pre-catalyst 122 and a main catalyst 124 connected in series.
• the catalyst treatment system 120 defines a first exhaust route A through the pipe system 12 for exhaust gases from the engine 14, and is connected at its other end to an input pipe 45 of a continuous regenerating trap 46.
• the other output pipe 32 is connected to one end of another catalyst treatment system 220 including a pre-catalyst 222 and a main catalyst 224 connected in series.
• the second catalyst treatment system 220 defines a second exhaust route B through the pipe system 12 for exhaust gases from the engine 14, and is connected at its other end to the input pipe 45 of the continuous regenerating trap 46.
• the continuous regenerating trap 46 is connected to an exhaust outlet pipe 48 defining the output port 18 of the exhaust system 60.
• each of output pipes 26,32 of the diverter valve 28 includes a butterfly valve member 36 movable between an open position 0 P and a closed position Oc ( Figures 4a and 4b).
• the exhaust route A,B taken by exhaust gases from the engine 14, through the pipe system 12, is determined by the relative orientation of the butterfly valve members 36 in the diverter valve 28. For example, when the butterfly valve member 36 in the first output pipe 26 is in its open position Op, exhaust gases from the engine 14 pass through the first catalyst treatment system 120. Similarly, when the butterfly valve member 36 in the second output pipe 32 is in its open position Op, exhaust gases from the engine 14 pass through the second catalyst treatment system 220.
• An exhaust gas sensor 150 is preferably provided downstream of the main catalysts 124,224 to identify and measure the quantities of one or more gases in the exhaust gases.
• the sensor 150 may include a single sensor located in the input pipe 45 of the continuous regenerating trap 46. Alternatively, the sensor 150 may include a separate sensor in each of the first and second catalyst treatment systems 120,220.
• the type of sensor 150 is determined by the fuel used in the engine 14 connected to the exhaust system 60.
• the sensor 150 is preferably a methane sensor to determine the quantity of methane contained in the exhaust gases.
• a sensor 150 provides means for analyzing exhaust gases passing through each of the routes A,B, and thereby permits comparative measurements to be made. It therefore enables the efficiency and effectiveness of the first catalyst treatment system 120 to be compared with that of the second catalyst treatment system 220.
• diverter valve 28 will make it possible to increase the lifetime of the exhaust system 60 by enabling the provision of two catalyst treatment systems 120, 220 which can be switched between.
• the butterfly valve member controlling the flow of exhaust gases through the route in which that catalyst treatment system is located may be closed, thus diverting all exhaust gases through the other of the two exhaust routes to ensure that all gases are treated by the other catalyst treatment system.
• the exliaust gas outlet pipe 48 preferably includes an exhaust gas sensor 152.
• the particular type of sensor 152 installed in the exhaust gas outlet pipe 48 is determined by the fuel used in the engine 14 connected to the exhaust system 60.
• the sensor 152 is preferably a methane sensor to determine the quantity of methane contained in the exhaust gases.
• the sensors 150,152 provided in the exhaust system 10 may include transmitters which permit the sensors 150,152 to transmit measurements to a central control unit 62.
• the control unit 62 may then use the measurements to control the diverter valve 28 and/or control the fuel injection in the engine 14.
• the control unit 62 is preferably linked to a remote control computer 64 so that performance of the exhaust system 60 may be monitored from a remote location.
• information from engine sensors may be passed to a diesel control module 66 and information from gas sensors may be passed to a gas control module 68.
• the diesel and gas control modules 66,68 may communicate with each other and control the diesel and gas injectors on the basis of the combined information.
• the exhaust system may comprise a single control module for controlling both the diesel and the gas injector.
• Information from the diesel and gas control modules 66,68 may also be passed to a cab display module 70 within the vehicle together with information acquired from other components in the vehicle. This enables the vehicle operator to monitor the performance of the engine. This vehicle and/or engine information may also be passed to the control unit 62 to assist it in controlling the diverter valve 28. It may also, in turn, be passed to the remote control computer 64.
• the exhaust system 80 includes a pipe system 12 connected to the exhaust of an engine 14.
• the pipe system 12 includes a single input port 115 for receiving exhaust gases from the engine 14.
• the pipe system 12 also includes an output port 18 for venting exhaust gases from the exhaust system 80.
• the input port 115 of the pipe system 12 is defined by one end of a catalyst treatment system 320 including a pre-catalyst 322 and a main catalyst 324 connected in series.
• the catalyst treatment system 320 is connected at its other end to an input pipe 34 of the diverter valve 28.
• the input pipe 34 of the diverter valve 28 splits to form two output pipes 26,32.
• One of the output pipes 26 is connected to an input pipe 82 of a chamber 84.
• Input pipe 82 and chamber 84 define a first exhaust route A through the pipe system 12 for exhaust gases from the engine 14.
• the chamber 84 includes an open valve (not shown) which allows the controlled release of exhaust gases directed to the chamber 84, and thereby defines an output port 18a of the exhaust system 80.
• the chamber 84 also includes a methane sensor 86.
• the other output pipe 32 is connected to an exhaust outlet pipe 88.
• the exhaust outlet pipe 88 defines a second exhaust route B through the pipe system 12 for exhaust gases from the engine 14, and defines an output port 18b of the exhaust system 80.
• each of output pipes 26,32 of the diverter valve 28 includes a butterfly valve member 36 movable between an open position Op and a closed position Oc ( Figures 4a and 4b).
• the exhaust route A,B taken by exhaust gases from the engine 14, through the pipe system 12, is determined by the relative orientation of the butterfly valve members 36 in the diverter valve 28. For example, when the butterfly valve member 36 in the first output pipe 26 is in its open position O P , exhaust gases from the engine 14 are passed via input pipe 82 into chamber 84. Similarly, when the butterfly valve member 36 in the second output pipe 32 is in its open position Op, exhaust gases from the engine 14 are passed to the exhaust outlet pipe 88.
• the arrangement of the chamber 84 forms a "dwell chamber" which allows the exhaust gases to be held in the vicinity of the methane sensor 86 when the butterfly valve member 36 in the first output pipe 26 is in its open position 0 P , before the exhaust gases are released from the chamber 84. This allows the sensor 86 to sample more effectively.
• the provision of the diverter valve 28 in the exhaust system 80 shown in Figure 3 enables the efficiency and effectiveness of the catalyst treatment system 320 to be tested by directing the exhaust gases into chamber 84, when required.
• the methane sensor 86 preferably includes a transmitter which allows the methane sensor 88 to transmit measurements to a central control unit 62.
• the control unit 62 may then pass this information on to a remote control computer 64.
• control unit 62 may receive information from the diesel and gas control units 66,68 which in turn it may pass on to the remote control computer 64.
• the control unit 62 preferably includes a transmitter to control the diverter valve 28, thereby permitting remote control and monitoring of the environment within the exhaust system.
• the diverter valve 28 may be controlled, either electrically or remotely, to control the flow of exhaust gases through the pipe system 12 in the event that one of the exhaust routes A,B becomes blocked or malfunctional.
• the diverter valve 28 may also include a failsafe arrangement which is operable to control the flow of exhaust gases through the pipe system 12 in the event of a power failure in the diverter valve 28.
• the butterfly valve members 36 may be movable to ensure that the exhaust gases pass along a predetermined one of the exhaust routes A,B by way of default.
• the butterfly valve members 36 may be movable to ensure that in the event that one of the exhaust routes A,B is blocked, for example, in a power failure situation, the exhaust gases pass along the other of the exhaust routes A,B.
• FIGS 4a-4d show a particular arrangement for diverter valve, as described with reference to Figures 1-3. It will be appreciated that other forms of valve can also be used.
• the exhaust system of the invention provides an exhaust system in which different flow rates can be controlled, thus enabling comparative measurements to be obtained for different systems and for the efficiency of exhaust systems to be monitored without adversely affecting the flow of exhaust gases through the system.
• the diverter valve 28 comprises a butterfly valve of the type described hereinabove with reference to Figures 1 to 3 and Figures 4a to 4d.
• the two butterfly members 36 forming the diverter valve 28 each comprise blades
• each butterfly valve member 36 50 formed on both the input face 21, and the output face 23 of each butterfly valve member 36.
• One of the butterfly members 36 controls the flow of exhaust gases in a first exhaust route A
• the second butterfly member controls the flow of exhaust gases in a second exhaust route B.
• exhaust route A this results in a substantially complete mixing of exhaust gases which allows a fully representative sample to be collected and tested by a gas sensor 86.
• exhaust route B the disruption to flow caused by the blades 50 in the diverter valve member 36 results in a more even distribution of gases across the face 58 of catalyst 60 forming part of the catalyst system 54.
• the walls 62 of the diverter valve 28 in exhaust route A are convex. This produces a venturi effect which enhances swirl caused by the diverter valve 28, further increasing the evenness of distribution across the face 58 of catalyst 60.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Health & Medical Sciences (AREA)
• Toxicology (AREA)
• Exhaust-Gas Circulating Devices (AREA)
• Valve Device For Special Equipments (AREA)
• Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
• Exhaust Gas After Treatment (AREA)
• Exhaust Silencers (AREA)

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Applications Claiming Priority (2)

Publications (1)

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ID=9953866

Family Applications (1)

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Citations (8)

• 2003
  • 2003-02-28 GB GBGB0304629.9A patent/GB0304629D0/en not_active Ceased
• 2004
  • 2004-03-01 AT AT04715949T patent/ATE526494T1/de active
  • 2004-03-01 ES ES04715949T patent/ES2392829T3/es not_active Expired - Lifetime
  • 2004-03-01 EP EP04715949A patent/EP1601863B1/de not_active Expired - Lifetime
  • 2004-03-01 DK DK04715949.6T patent/DK1601863T3/da active
  • 2004-03-01 WO PCT/GB2004/000821 patent/WO2004076830A1/en active Application Filing
  • 2004-03-01 SI SI200431788T patent/SI1601863T1/sl unknown
  • 2004-03-01 PL PL04715949T patent/PL1601863T3/pl unknown
  • 2004-03-01 PT PT04715949T patent/PT1601863E/pt unknown

Patent Citations (8)

Non-Patent Citations (2)

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