EP2075450A1 - Exhaust gas recirculation device and vehicle - Google Patents

Exhaust gas recirculation device and vehicle Download PDF

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Publication number
EP2075450A1
EP2075450A1 EP08022430A EP08022430A EP2075450A1 EP 2075450 A1 EP2075450 A1 EP 2075450A1 EP 08022430 A EP08022430 A EP 08022430A EP 08022430 A EP08022430 A EP 08022430A EP 2075450 A1 EP2075450 A1 EP 2075450A1
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EP
European Patent Office
Prior art keywords
exhaust gas
engine
exhaust
extraction route
route
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Withdrawn
Application number
EP08022430A
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German (de)
English (en)
French (fr)
Inventor
Minoru Yamamoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yamaha Motor Co Ltd
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Yamaha Motor Co Ltd
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Filing date
Publication date
Application filed by Yamaha Motor Co Ltd filed Critical Yamaha Motor Co Ltd
Publication of EP2075450A1 publication Critical patent/EP2075450A1/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
    • F02M26/07—Mixed pressure loops, i.e. wherein recirculated exhaust gas is either taken out upstream of the turbine and reintroduced upstream of the compressor, or is taken out downstream of the turbine and reintroduced downstream of the compressor
    • 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
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
    • 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
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/41—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories characterised by the arrangement of the recirculation passage in relation to the engine, e.g. to cylinder heads, liners, spark plugs or manifolds; characterised by the arrangement of the recirculation passage in relation to specially adapted combustion chambers
    • 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
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
    • F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
    • 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
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
    • F02M26/06—Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream of the compressor

Definitions

  • the present invention relates to an exhaust gas recirculation device and a vehicle, and more particularly, to an exhaust gas recirculation device and a vehicle where exhaust gas from an engine is extracted and directed to the engine intake.
  • Exhaust gas recirculation (EGR) devices for extracting a portion of exhaust gas from the exhaust side of an engine of an automobile and directing it to the intake side of the engine are known.
  • the technique uses exhaust gas to suppress combustion of fuel within the engine and thus lower combustion temperatures, thereby reducing generation of nitrogen oxides (NOx).
  • NOx nitrogen oxides
  • Figure 14 shows a configuration of a conventional EGR device.
  • An intake manifold 111 is connected to the intake side of an engine 101, and an exhaust manifold 109 is connected to the exhaust side of the engine. A portion of exhaust gas prior to entering exhaust manifold 109 is directed, along an exhaust extraction route EGR1, through a flow rate regulation valve V1, an EGR cooler 301, and a pressure regulation valve V3 to intake manifold 111.
  • Coolant flows into EGR cooler 301 to lower the temperature of hot exhaust gas within exhaust extraction route EGR1.
  • Flow rate regulation valve V 1 controls the amount of exhaust gas extracted from the exhaust side.
  • Pressure regulation valve V3 serves as an intake throttle and prevents backward flow of exhaust gas in exhaust extraction route EGR1.
  • a portion of exhaust extraction route EGR1 is incorporated within the cylinder head.
  • Document 1 discloses an EGR device for extracting a portion of exhaust gas from the exhaust side and recirculating it to the intake side.
  • a water-cooling EGR cooler is mounted on the EGR pipe in its mid-flow.
  • An air-cooling EGR cooler is disposed downstream of the water-cooling EGR cooler.
  • the technique in Document 1 uses heat exchange with coolant in the water-cooling EGR cooler to cool exhaust gas to be recirculated toward the intake side down to under 200 degrees Celsius and then uses heat exchange with ambient air in the air-cooling EGR cooler to cool exhaust gas to under 100 degrees Celsius in order to lower the temperature of exhaust gas to below the temperature of coolant for cooling the engine (about 80 degrees Celsius).
  • Document 2 discloses a start-up control device for a diesel engine.
  • Document 3 discloses an exhaust gas reflux device for introducing exhaust gas which has not been cooled by an EGR cooler (hot EGR gas) into the engine intake during cold start or low load operation in order to promote combustion, thereby reducing generation of HC, white smoke or the like.
  • EGR cooler hot EGR gas
  • Document 4 discloses an exhaust gas recirculation device for an engine where a heat exchanger for cooling exhaust gas is disposed along a portion of a passageway that directs exhaust gas back into the intake air.
  • the main objects of EGR are to reduce NOx in exhaust gas and to reduce fuel consumption. To achieve these objects, EGR is more effective if cooled exhaust gas is used.
  • the technique in Document 2 has the following problem: Though the air remaining in the engine room and the intake system is hot, it is not hot enough to enable ignition without high pressures inside the cylinder(s), bringing little advantage.
  • the technique in Document 3 allows hot exhaust gas to be introduced directly into the intake during engine start-up, without directing it through an EGR cooler.
  • exhaust gas that has been cooled by the EGR cooler can be introduced into the intake.
  • exhaust gas can be extracted at only one location, i.e. immediately after it is exhausted from the cylinder(s). Exhaust gas at this location is so hot that a large cooler is needed to sufficiently cool it down.
  • exhaust gas can be extracted at one location (the exhaust manifold) immediately after it is exhausted from the cylinder(s), again requiring a large cooler to sufficiently cool the exhaust gas.
  • the present invention was made to solve the above problems.
  • the object of the present invention is to provide an exhaust gas recirculation device and a vehicle where exhaust gas that has been efficiently cooled can be utilized.
  • an exhaust gas recirculation device includes an exhaust extraction route for extracting exhaust gas from an engine and directing it to an intake of the engine, where the exhaust extraction route includes a route for cooling exhaust gas from the engine by directing it through a frame of a vehicle or through a pipe attached to a frame.
  • extracted exhaust gas can be passed through a frame of the vehicle or through a pipe attached to a frame.
  • the exhaust gas from the engine can be cooled either at the frame of the vehicle or at the pipe attached to the frame, so that an exhaust gas recirculation device capable of directing to the engine intake exhaust gas that has been efficiently cooled can be provided.
  • the exhaust extraction route is a low temperature exhaust extraction route for extracting exhaust gas after it has exited a turbocharger and directing it to the engine intake
  • the exhaust gas recirculation device further includes: a high temperature exhaust extraction route for extracting exhaust gas from the engine before it enters the turbocharger and directing it to the engine intake; and a control means for controlling, based on operation conditions of the engine, a flow of exhaust gas to be directed to the engine intake by means of the high temperature exhaust extraction route and the low temperature exhaust extraction route.
  • exhaust gas can be extracted from the engine at different locations for the high temperature exhaust extraction route and the low temperature exhaust extraction route. This allows relatively hot exhaust gas and relatively cold exhaust gas to be directed to the engine intake. Further, the low temperature exhaust extraction route can be used for extracting exhaust gas after it has exited the turbocharger, thereby allowing exhaust gas that has been efficiently cooled to be utilized at the engine intake.
  • the low temperature exhaust extraction route directs exhaust gas from the engine to an upstream of a compressor of the turbocharger
  • the high temperature exhaust extraction route directs exhaust gas from the engine to a downstream of the compressor of the turbocharger
  • exhaust gas at a relatively low pressure after it has exited the turbocharger can be directed to the upstream of the compressor of the turbocharger which is at a low pressure. Further, exhaust gas at a high pressure extracted before it enters the turbocharger can be directed to the downstream of the compressor which is at a high pressure.
  • the exhaust gas recirculation device further includes: a high temperature exhaust extraction route for extracting exhaust gas from the engine before it enters a muffler and directing it to the engine intake, while the low temperature exhaust extraction route is for extracting exhaust gas from the engine downstream of an extraction location of the high temperature exhaust extraction route and directing it to the engine intake; and a control means for controlling, based on operation conditions of the engine, a flow of exhaust gas to be directed to the engine intake by means of the high temperature exhaust extraction route and the low temperature exhaust extraction route.
  • a high temperature exhaust extraction route for extracting exhaust gas from the engine before it enters a muffler and directing it to the engine intake
  • the low temperature exhaust extraction route is for extracting exhaust gas from the engine downstream of an extraction location of the high temperature exhaust extraction route and directing it to the engine intake
  • a control means for controlling, based on operation conditions of the engine, a flow of exhaust gas to be directed to the engine intake by means of the high temperature exhaust extraction route and the low temperature exhaust extraction route.
  • exhaust gas can be extracted from the engine at different locations for the high temperature exhaust extraction route and the low temperature exhaust extraction route.
  • This allows relatively hot exhaust gas and relatively cold exhaust gas to be directed to the engine intake.
  • the low temperature exhaust extraction route can be used for directing to the engine intake exhaust gas that has been cooled by passing through a frame of the vehicle or through a pipe attached to a frame, thereby allowing exhaust gas that has been efficiently cooled to be utilized at the engine intake.
  • the low temperature exhaust extraction route is an exhaust extraction route for extracting exhaust gas that has passed at least through the muffler and directing it to the engine intake.
  • exhaust gas that has been efficiently cooled can be utilized at the engine intake.
  • the exhaust gas recirculation device further includes a mixing exhaust extraction route for mixing exhaust gas passing through the high temperature exhaust extraction route with exhaust gas passing through the low temperature exhaust extraction route, where the control means controls, based on operation conditions of the engine, a flow of exhaust gas in the mixing exhaust extraction route.
  • a vehicle includes an engine and the exhaust gas recirculation device according to any of the above connected with the engine.
  • a vehicle can be provided where exhaust gas that has been efficiently cooled can be utilized at the engine intake.
  • An engine including an exhaust gas recirculation device includes at least 2 (two) exhaust extraction routes.
  • the exhaust extraction location on exhaust extraction route EGR1 is a portion thereof where exhaust gas is still hot (hot portion), for example immediately after the exhaust valve.
  • the exhaust extraction location on exhaust extraction route EGR2 is a portion of the exhaust piping where exhaust gas is already cold (cold portion). Switching can be made between the exhaust extraction routes for use based on operation conditions of the engine.
  • Hot exhaust gas extracted through exhaust extraction route EGR1 is used during engine start-up, for example.
  • Cold exhaust gas extracted through exhaust extraction route EGR2 is used during high load period, for example.
  • the exhaust extraction location in the hot portion can be anywhere between the exhaust port and the turbocharger, while the exhaust extraction location in the cold portion can be anywhere downstream of the turbocharger.
  • the exhaust extraction location in the hot portion can be, at the latest, a location before exhaust gas enters the muffler, while the exhaust extraction location in the cold portion can be, at the earliest, a location after exhaust gas has gone through the muffler (near the exit of the muffler).
  • exhaust extraction route EGR2 can be a route in which extracted exhaust gas is cooled by flowing through the frame of the vehicle or through a pipe attached to the frame before being directed to the engine intake.
  • Figure 1 shows a configuration of an exhaust gas recirculation device for a two-wheeled motor vehicle (a saddle type vehicle) according to a first embodiment of the present invention.
  • the exhaust gas recirculation device includes: an engine 101 (represented by a four-cylinder diesel engine in this implementation); an air cleaner 107 for cleaning intake air; a compressor 103b contained in a turbocharger 103 for compressing intake air; an intercooler 105 for cooling compressed air; an intake manifold 111 for directing cooled air to the cylinders of the engine; an exhaust manifold 109 for gathering exhaust gas from the cylinders of engine 101; a turbine 103a contained in turbocharger 103 for rotating compressor 103b by means of exhaust gas; an exhaust pipe 113 for directing exhaust gas from turbine 103a; a muffler 115 for muffling the sound of exhaust gas; a body frame 121 of the two-wheeled motor vehicle for cooling a portion of exhaust gas from muffler 115; and an EGR cooler 123 for cooling exhaust gas that has undergone heat dissipation at frame 121.
  • an engine 101 represented by a four-cylinder diesel engine in this implementation
  • an air cleaner 107 for cleaning
  • Exhaust extraction route EGR1 is a route in which exhaust gas immediately after exiting exhaust manifold 109 (or immediately after exiting engine 101) is mixed with air that has exited intercooler 105 and will enter intake manifold 111.
  • Exhaust extraction route EGR2 is a route in which exhaust gas from exhaust manifold 109 is cooled in turbine 103a, exhaust pipe 113, muffler 115, frame 121 and EGR cooler 123 and is mixed with air that has exited air cleaner 107.
  • valve V1 is provided in mid-flow of exhaust extraction route EGR1 for regulating the flow rate of exhaust gas in exhaust extraction route EGR1
  • a valve V2 is provided in mid-flow of exhaust extraction route EGR2 for regulating the flow rate of exhaust gas in exhaust extraction route EGR2.
  • a throttle S is provided immediately prior to the meeting of exhaust extraction route EGR1 and the pipe extending from the exit of intercooler 105 for regulating the amount of air to be directed to the engine and preventing backward flow of exhaust gas from exhaust extraction route EGR1 toward intercooler 105.
  • Figure 2 is a side view of a two-wheeled motor vehicle incorporating the exhaust gas recirculation device of Figure 1 .
  • EGR cooler 123 is attached to a cowl located above a front wheel 151.
  • EGR cooler 123 is desirably mounted on the front part of the body, for example in front of the front fork.
  • muffler 115 is mounted above back wheel 153.
  • Exhaust extraction route EGR1 is provided as a route for mixing exhaust gas immediately after exiting engine 101 with intake air for engine 101.
  • Frame 121 forming a portion of exhaust extraction route EGR2, serves as the body frame of the two-wheeled motor vehicle, too.
  • a route 125 is provided in the middle of frame 121 for draining water and soot. It is used for letting water or soot free-fall from the lowest point of the frame in mid-flow of the EGR.
  • room small chamber
  • frame 121 for retaining exhaust gas for a while.
  • the flow of air when entering the small chamber, slows down.
  • condensed water and soot are accumulated in the small chamber.
  • the water and soot are drained to the outside through a hole of a small diameter communicating the small chamber with the outside and through route 125.
  • This mechanism for draining condensed water and soot is similar to a drain attached to an engine silencer in terms of its structure.
  • Figure 3 is a side view of a frame 121.
  • the implementation shown uses a hollow frame 121.
  • the dashed line in the figure indicates a partition inside the frame. Arrows indicate routes for exhaust gas.
  • Frame 121 includes: an exhaust gas inlet 121a for introducing exhaust gas from muffler 115 into the frame; an exhaust gas outlet 121 b for directing exhaust gas to EGR cooler 123; an exhaust gas inlet 121c for introducing exhaust gas from EGR cooler 123 into the frame; and an exhaust gas outlet 121d for directing exhaust gas to the engine.
  • the frame is desirably made up of an SUS (Stainless Steel) pipe(s) in order to prevent corrosion.
  • Frames made of various materials or made using various manufacture methods, such as an iron frame or an aluminum frame, can be used as the route for exhaust gas as long as they are hollow and have corrosion control treatment applied to the inner wall of the exhaust gas passageway.
  • a portion of a frame may have a hollow passageway, which can be used as the route for exhaust gas, and heat dissipation can occur through the frame.
  • an exhaust gas passageway made of an SUS (Stainless Steel) pipe(s) can be fixed to the frame, the passageway being in contact with the frame, to provide a route integrated into the frame for exhaust gas.
  • This implementation also ensures a heat dissipation area and allows exhaust gas to be cooled more efficiently than an implementation in which a pipe alone forms the route for exhaust gas. Further, fixing a pipe integrally to the frame improves the strength of the frame.
  • Figure 4 is a block diagram of a control circuit for the exhaust gas recirculation device of Figure 1 .
  • an engine control unit 201 for controlling the electrical system of the vehicle; an engine revolution sensor 203 for measuring the number of engine revolutions; an accelerator opening sensor 205 for detecting the degree of opening of the accelerator; a coolant temperature sensor 207 for detecting the temperature of the coolant; an oil temperature sensor 209 for detecting the temperature of oil; and an intake air temperature sensor 211 for detecting the temperature of intake air.
  • output of either coolant temperature sensor 207 or oil temperature sensor 209 may be used for controlling the exhaust gas recirculation device.
  • Engine control unit 201 can be used for controlling valve V1 that regulates the flow rate of exhaust gas in exhaust extraction route EGR1, valve V2 that regulates the flow rate of exhaust gas in exhaust extraction route EGR2, and throttle S that prevents backward flow of exhaust gas, as described above.
  • Figure 5 is a flow chart showing a control process performed by the exhaust gas recirculation device during engine start-up.
  • step S101 When the ignition key is turned to ON in step S101, it is determined whether the coolant temperature or oil temperature is not higher than 30 degrees Celsius in step S103.
  • valve V1 on exhaust extraction route EGR1 is fully opened and valve V2 on exhaust extraction route EGR2 is fully closed in step S105.
  • valve V1 on exhaust extraction route EGR1 is fully closed and valve V2 on exhaust extraction route EGR2 is fully opened in step S 117.
  • step S107 When the starter switch is turned on in step S107, the starter of the engine is rotated in step S109, thereby starting crank rotation.
  • step S111 the process waits until the number of revolutions of the crank reaches a target value or becomes larger; in step S113, fuel injection is initiated, thereby starting combustion in the cylinder(s).
  • step S115 the amount of fuel injection, the time period for fuel injection, the number of fuel injections, and the fuel injection pressure are changed based on sensor detection values or the like. Further, the number of engine revolutions, the degree of opening of the accelerator, the coolant temperature or oil temperature, and the intake air temperature are detected and, based on the combination of the detection values, the degree of opening of valve V1 on exhaust extraction route EGR1 and that of valve V2 on exhaust extraction route EGR2 are changed in order to switch between various modes of introduction of exhaust gas into the engine.
  • Figure 6 illustrates controls in step S 115 of Figure 5 .
  • the figure shows how engine control unit 201 regulates the degree of opening of valves V 1 and V2 based on the degree of opening of the accelerator and the number of engine revolutions in the following conditions: (a) the coolant temperature or oil temperature is lower than 20 degrees Celsius (cold state); (b) the coolant temperature or oil temperature is 20 degrees Celsius or higher than 20 degrees Celsius and lower than 60 degrees Celsius; and (c) the coolant temperature or oil temperature is 60 degrees Celsius or higher (warm-up state).
  • the following controls are performed:
  • valve V1 is fully closed and valve V2 is opened so that only exhaust gas in exhaust extraction route EGR2 is directed to the engine.
  • exhaust gas in exhaust extraction route EGR 1 and exhaust gas in exhaust extraction route EGR2 are directed to the engine, it is desirable to adjust the blend ratio of exhaust gas from exhaust extraction route EGR 1 to exhaust gas from exhaust extraction route EGR 2 in such a way that the amount of exhaust gas from exhaust extraction route EGR2 increases as the number of engine revolutions increases, or that the amount of exhaust gas from exhaust extraction route EGR 2 increases as the degree of opening of the accelerator increases.
  • This is intended to adjust the amount of gas from each of the exhaust extraction routes to be mixed in such a way that the intake air temperature in the engine after the mixing is equal to a target intake air temperature.
  • Such adjustments can be performed so that the temperature during fuel combustion lies at 1500-1800 (K), thereby reducing harmful exhaust gas (CO, NOx) or smoke.
  • Figure 7 shows a configuration of an exhaust gas recirculation device for a two-wheeled motor vehicle according to a second embodiment of the present invention.
  • the exhaust gas recirculation device is different from that of the first embodiment in that another exhaust extraction route EGR3 is provided for mixing exhaust gas immediately after exiting exhaust manifold 109 (immediately after exiting engine 101) with exhaust gas in exhaust extraction route EGR2.
  • a valve V3 is provided in mid-flow of exhaust extraction route EGR3 for regulating the flow rate of exhaust gas in exhaust extraction route EGR3. It is used for mixing hot EGR gas in exhaust extraction route EGR3 with gas in exhaust extraction route EGR2 to adjust the temperature of the mixture, before it is introduced into the intake.
  • Figure 8 is a block diagram of a control circuit of the exhaust gas recirculation device of Figure 7 .
  • engine control unit 201 in the exhaust gas recirculation device further controls valve V3 for regulating the flow rate of exhaust gas in exhaust extraction route EGR3, described above.
  • Figure 9 illustrates a control method for the valves of the exhaust gas recirculation device according to the second embodiment.
  • this figure also shows how engine control unit 201 regulates the degree of opening of valves V1, V2 and V3 based on the degree of opening of the accelerator and the number of engine revolutions in the following conditions: (a) the coolant temperature or oil temperature is lower than 20 degrees Celsius (cold state); (b) the coolant temperature or oil temperature is 20 degrees Celsius or higher than 20 degrees Celsius and lower than 60 degrees Celsius; and (c) the coolant temperature or oil temperature is 60 degrees Celsius or higher (warm-up state).
  • the following controls are performed:
  • valves V1 and V3 are fully closed and valve V2 is opened so that only exhaust gas in exhaust extraction route EGR2 is directed to the engine.
  • exhaust gas in exhaust extraction route EGR2 and exhaust gas in exhaust extraction route EGR3 are directed to the engine, it is desirable to adjust the blend ratio of exhaust gas from exhaust extraction route EGR2 to exhaust gas from exhaust extraction route EGR3 in such a way that the amount of exhaust gas from exhaust extraction route EGR2 increases as the number of engine revolutions increases, or that the amount of exhaust gas from exhaust extraction route EGR2 increases as the degree of opening of the accelerator increases.
  • this is intended to adjust the amount of gas from each of the exhaust extraction routes to be mixed in such a way that the intake air temperature in the engine after the mixing is equal to a target intake air temperature.
  • Such adjustments can be performed so that the temperature during fuel combustion lies at 1500-1800 (K), thereby reducing harmful exhaust gas (CO, NOx) or smoke.
  • Figure 10 is a side view of a two-wheeled motor vehicle incorporating the exhaust gas recirculation device of Figure 1 according to a third embodiment.
  • the figure shows an exhaust gas recirculation device incorporated in an off-road two-wheeled motor vehicle.
  • EGR cooler 123 is attached to the front part of the body frame. Further, muffler 115 is mounted above back wheel 153.
  • Exhaust extraction route EGR1 is provided as a route for mixing exhaust gas immediately after exiting engine 101 with intake air for engine 101.
  • Frame 121 forming a portion of exhaust extraction route EGR2, serves as the frame of the two-wheeled motor vehicle, too.
  • a route 125 is provided in the middle of frame 121 for draining water and soot.
  • Figure 11 is a side view of a frame 121.
  • the implementation shown uses a hollow frame 121.
  • the route for exhaust gas is indicated by arrows.
  • Frame 121 includes: an exhaust gas inlet 121a for introducing exhaust gas from muffler 115 into the frame; and an exhaust gas outlet 121 b for directing exhaust gas to EGR cooler 123.
  • an exhaust gas passageway made of an SUS (Stainless Steel) pipe(s) can be fixed to the frame, the passageway being in contact with the frame, to provide a route for exhaust gas integrated into the frame.
  • Figure 12 is a side view of a two-wheeled motor vehicle incorporating the exhaust gas recirculation device of Figure 1 according to a fourth embodiment.
  • the present implementation shows an exhaust gas recirculation device incorporated into a naked two-wheeled motor vehicle.
  • EGR cooler 123 is attached to the front part of the body frame. Further, muffler 115 is mounted close to the side of back wheel 153.
  • Exhaust extraction route EGR1 is provided as a route for mixing exhaust gas immediately after exiting engine 101 with intake air for engine 101.
  • Frame 121 forming a portion of exhaust extraction route EGR2, serves as the frame of the two-wheeled motor vehicle, too.
  • a route 125 is provided in the middle of frame 121 for draining water and soot.
  • Figure 13 is a side view of a frame 121.
  • the implementation shown uses a hollow frame 121.
  • the route for exhaust gas is indicated by arrows.
  • Frame 121 includes: an exhaust gas inlet 121a for introducing exhaust gas from exhaust pipe 113 disposed upstream of muffler 115 into the frame; and an exhaust gas outlet 121b for directing exhaust gas to EGR cooler 123.
  • an exhaust gas passageway made of an SUS (Stainless Steel) pipe(s) can be fixed to the frame, the passageway being in contact with the frame, to provide a route for exhaust gas integrated into the frame.
  • hot exhaust gas immediately after the exhaust valve can be used for EGR when the temperature of intake air for the engine is to be increased during start-up, during warm-up operation or the like.
  • increase in temperature in the cylinder(s) can be promoted to ensure stable engine start-up.
  • the temperature of exhaust gas used for EGR should be as low as possible in order to reduce NOx and fuel consumption.
  • exhaust gas that has been sufficiently cooled by passing through the exhaust pipe and the like can be introduced into EGR.
  • two EGR routes can be combined to achieve an exhaust gas temperature equal to a target temperature before exhaust gas is introduced into the intake.
  • the amount of smoke emission can be reduced.
  • Exhaust gas from the engine can be cooled using at least one of the following: the turbocharger, the muffler, the frame of the vehicle, and a pipe attached to the frame. In this way, exhaust gas can be efficiently cooled.
  • the body frame as a portion of the EGR route(s), the number of components of the EGR piping can be reduced.
  • exhaust gas that has passed through the muffler can be directed through the body frame to cause heat dissipation with ambient air so that exhaust gas that has been significantly cooled at the muffler can be further cooled.
  • room can be provided at the lowest point to accumulate soot and condensed water, and accumulated matters can be drained naturally through a communicating hole to the outside, thereby ensuring clearance of the passageway.
  • hot EGR gas can be introduced into the engine intake for some time period immediately after engine start-up, thereby reducing smoke.
  • fuel may not be injected and only air may be compressed, and air that has been compressed and become hot may be directed through an EGR route and introduced back into the cylinder.
  • fuel injection may be initiated when the number of revolutions of the crank is at a predetermined level or higher. This will ensure more stable startability since the temperature within the cylinder(s) is high at the time of initiation of injection.
  • the EGR cooler is desirably disposed in the front part of the body or in a place near the engine that receives the wind generated while the vehicle is running, i.e. a location where the wind generated while the vehicle is running can be utilized for cooling.
  • exhaust gas extracted immediately after the exhaust valve is desirably introduced into a section immediately prior to the intake valve (a high pressure section).
  • exhaust gas that has been extracted from the muffler or the like is desirably introduced into a section upstream of the compressor (a low pressure section). This is intended to make the pressure at one end of an EGR route close to that of its other end, thereby facilitating adjustment of pressures.
  • a small chamber disposed in mid-flow of an exhaust gas passageway including a body frame
  • a small chamber may be replaced by a filter structure with a labyrinthine configuration for gathering soot and condensed water.
  • a portion in mid-flow of the passageway may be in a T-shape where water and soot can be trapped in the lower portion.
  • the present invention can be employed for both an engine with a turbocharger and an engine without a turbocharger.
  • the engine may be a diesel or gasoline engine.
  • the present invention can be employed for two-wheeled motor vehicles and saddle type vehicles such as motor-assisted bicycles.
  • the present invention may be carried out in any saddle type vehicle, such as two-wheeled, three-wheeled or four-wheeled vehicles (or vehicles with more wheels), or vehicles that can be moved using a crawler mechanism.
  • the present invention may be employed in automobiles and other vehicles with an engine.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
EP08022430A 2007-12-26 2008-12-23 Exhaust gas recirculation device and vehicle Withdrawn EP2075450A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007334784A JP5283898B2 (ja) 2007-12-26 2007-12-26 排気ガス再循環装置および車両

Publications (1)

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EP2075450A1 true EP2075450A1 (en) 2009-07-01

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EP08022430A Withdrawn EP2075450A1 (en) 2007-12-26 2008-12-23 Exhaust gas recirculation device and vehicle

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EP (1) EP2075450A1 (ja)
JP (1) JP5283898B2 (ja)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9309804B2 (en) * 2013-03-14 2016-04-12 Southwest Research Institute Dual path (low pressure loop and high pressure loop) EGR for improved air boosting efficiency
DE102015206891A1 (de) * 2015-04-16 2016-10-20 Bayerische Motoren Werke Aktiengesellschaft Abgasrückführungsbaugruppe mit Abgaskrümmer
WO2018163046A1 (en) * 2017-03-06 2018-09-13 Tvs Motor Company Limited An exhaust gas recirculation system
CN111075536A (zh) * 2018-10-18 2020-04-28 现代自动车株式会社 用于消声器的可变气门以及具有可变气门的双消声器
DE102009051027B4 (de) * 2009-10-28 2021-01-21 Audi Ag Antriebsaggregat mit einer Dieselbrennkraftmaschine und Abgasrückführung sowie Verfahren zum Betreiben eines solchen Antriebsaggregats

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009036743A1 (de) * 2009-08-08 2011-02-10 Daimler Ag Verbrennungskraftmaschine
JP5287929B2 (ja) * 2011-05-20 2013-09-11 株式会社デンソー 電子制御装置

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JPH07166973A (ja) 1993-12-13 1995-06-27 Yamaha Motor Co Ltd エンジンの排気ガス再循環装置
JPH11200955A (ja) 1998-01-06 1999-07-27 Mitsubishi Motors Corp 排気ガス還流装置
JP2000038964A (ja) * 1998-07-23 2000-02-08 Isuzu Motors Ltd Ｅｇｒクーラ
JP2002188526A (ja) 2000-12-20 2002-07-05 Hino Motors Ltd Ｅｇｒ装置
JP2003161209A (ja) * 2001-11-28 2003-06-06 Hino Motors Ltd Ｅｇｒクーラ
JP2006046199A (ja) 2004-08-05 2006-02-16 Toyota Motor Corp ディーゼルエンジンの始動制御装置及び方法
JP2007315174A (ja) * 2006-05-23 2007-12-06 Moo Town:Kk エンジンの排ガス再循環及び触媒後処理式排ガス浄化装置

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JPH08291772A (ja) * 1995-04-20 1996-11-05 Mazda Motor Corp エンジンのｅｇｒガス取出構造
JPH0911933A (ja) * 1995-06-30 1997-01-14 Nissan Diesel Motor Co Ltd サイドレールの構造
JPH11198664A (ja) * 1998-01-09 1999-07-27 Nissan Motor Co Ltd センタメンバ内排気系配管一体構造
JP2003083026A (ja) * 2001-09-07 2003-03-19 Honda Motor Co Ltd 内燃機関の排気浄化装置
JP4000987B2 (ja) * 2002-10-29 2007-10-31 三菱ふそうトラック・バス株式会社 圧縮着火式内燃機関
JP4720585B2 (ja) * 2006-04-04 2011-07-13 日産自動車株式会社 ターボ過給機付内燃機関の排気還流装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07166973A (ja) 1993-12-13 1995-06-27 Yamaha Motor Co Ltd エンジンの排気ガス再循環装置
JPH11200955A (ja) 1998-01-06 1999-07-27 Mitsubishi Motors Corp 排気ガス還流装置
JP2000038964A (ja) * 1998-07-23 2000-02-08 Isuzu Motors Ltd Ｅｇｒクーラ
JP2002188526A (ja) 2000-12-20 2002-07-05 Hino Motors Ltd Ｅｇｒ装置
JP2003161209A (ja) * 2001-11-28 2003-06-06 Hino Motors Ltd Ｅｇｒクーラ
JP2006046199A (ja) 2004-08-05 2006-02-16 Toyota Motor Corp ディーゼルエンジンの始動制御装置及び方法
JP2007315174A (ja) * 2006-05-23 2007-12-06 Moo Town:Kk エンジンの排ガス再循環及び触媒後処理式排ガス浄化装置

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009051027B4 (de) * 2009-10-28 2021-01-21 Audi Ag Antriebsaggregat mit einer Dieselbrennkraftmaschine und Abgasrückführung sowie Verfahren zum Betreiben eines solchen Antriebsaggregats
US9309804B2 (en) * 2013-03-14 2016-04-12 Southwest Research Institute Dual path (low pressure loop and high pressure loop) EGR for improved air boosting efficiency
DE102015206891A1 (de) * 2015-04-16 2016-10-20 Bayerische Motoren Werke Aktiengesellschaft Abgasrückführungsbaugruppe mit Abgaskrümmer
WO2018163046A1 (en) * 2017-03-06 2018-09-13 Tvs Motor Company Limited An exhaust gas recirculation system
CN111075536A (zh) * 2018-10-18 2020-04-28 现代自动车株式会社 用于消声器的可变气门以及具有可变气门的双消声器
CN111075536B (zh) * 2018-10-18 2022-04-15 现代自动车株式会社 用于消声器的可变气门以及具有可变气门的双消声器

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JP5283898B2 (ja) 2013-09-04

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