WO2013102948A1 - 排気加熱装置 - Google Patents
排気加熱装置 Download PDFInfo
- Publication number
- WO2013102948A1 WO2013102948A1 PCT/JP2012/000013 JP2012000013W WO2013102948A1 WO 2013102948 A1 WO2013102948 A1 WO 2013102948A1 JP 2012000013 W JP2012000013 W JP 2012000013W WO 2013102948 A1 WO2013102948 A1 WO 2013102948A1
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- WIPO (PCT)
- Prior art keywords
- exhaust
- housing
- fuel
- wall surface
- communication port
- Prior art date
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Classifications
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- 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
- F01N3/103—Oxidation catalysts for HC and CO only
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- 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
- F01N3/023—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 using means for regenerating the filters, e.g. by burning trapped particles
- F01N3/025—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 using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
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- 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
- F01N3/023—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 using means for regenerating the filters, e.g. by burning trapped particles
- F01N3/025—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 using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
- F01N3/0253—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 using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust adding fuel to exhaust gases
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- 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
- F01N3/023—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 using means for regenerating the filters, e.g. by burning trapped particles
- F01N3/025—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 using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
- F01N3/0253—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 using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust adding fuel to exhaust gases
- F01N3/0256—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 using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust adding fuel to exhaust gases the fuel being ignited by electrical means
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- 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
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
- F01N3/2033—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using a fuel burner or introducing fuel into exhaust duct
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- 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
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
- F01N3/204—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using an exhaust gas igniter, e.g. a spark or glow plug, without introducing fuel into exhaust duct
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- 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
- F01N3/36—Arrangements for supply of additional fuel
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- 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
- F01N3/38—Arrangements for igniting
-
- 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
- F01N13/08—Other arrangements or adaptations of exhaust conduits
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- 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
- F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
- F01N2240/14—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a fuel burner
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- 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 exhaust heating apparatus that increases the temperature of exhaust gas in order to activate and maintain an active state of an exhaust gas purification apparatus in an internal combustion engine.
- Patent Document 1 and the like propose an internal combustion engine in which an exhaust heating device is incorporated in an exhaust passage upstream of the exhaust purification device.
- the exhaust gas heating device generates a heating gas in the exhaust gas, and supplies the generated heating gas to the exhaust gas purification device on the downstream side to promote activation of the exhaust gas purification device or maintain an active state.
- the exhaust heating device generally has an ignition means such as a glow plug for generating a heated gas by heating and igniting the fuel, and a fuel addition valve for injecting the fuel toward the ignition means. .
- Patent Document 1 a pipe body portion connected in an orthogonal state to the exhaust pipe is provided, and injected from a fuel addition valve into a combustion portion defined by the pipe body portion.
- a collision member for receiving the fuel is arranged.
- the heat generating part of the glow plug is located between the collision member and the fuel addition valve so as to promote the mixing of the exhaust gas flowing from the exhaust passage into the combustion part and the fuel injected from the fuel addition valve by the collision member. It has become.
- Cited Document 1 since the collision member reduces the flow velocity of the exhaust gas flowing from the exhaust passage into the combustion section and forms stagnation in the combustion region around the collision member, new exhaust gas from the exhaust passage is generated. It cannot efficiently flow into the combustion section.
- the pressure loss of the combustion portion increases due to the venturi effect, and it becomes more difficult to cause a portion of the exhaust gas flowing through the exhaust passage to flow into the combustion portion.
- the inflow of exhaust gas to the combustion section is not efficiently performed, it is difficult to efficiently flow the combustion gas generated in the combustion section to the exhaust passage, and improvement is desired.
- An object of the present invention is to provide an exhaust heating apparatus that can continuously ignite and burn fuel without causing a decrease in oxygen concentration and can efficiently discharge combustion gas to an exhaust passage. is there.
- An exhaust heating device is connected to an internal combustion engine and connected to an exhaust pipe defining an exhaust passage, through a housing defining a combustion chamber, and a communication port formed in the wall of the exhaust pipe.
- ignition means having a heat generating portion for igniting the fuel injected into the combustion chamber, the exhaust gas flowing through the exhaust passage
- An exhaust heating apparatus in which a part of the exhaust gas flows into the combustion chamber from the communication port, and the combustion gas generated here flows out again from the communication port to the exhaust passage. Is formed between the wall surface of the exhaust pipe adjacent to the communication port located upstream of the exhaust passage and the upstream side wall surface of the housing located upstream of the exhaust passage.
- the angle formed by is set to an obtuse angle.
- the exhaust gas flowing through the exhaust passage along the wall surface of the exhaust pipe is guided from the communication port to the upstream side wall surface of the housing extending along the wall surface of the exhaust pipe, and flows into the combustion chamber.
- the exhaust gas flowing into the combustion chamber forms a new air-fuel mixture with the fuel injected from the fuel addition valve, is ignited by being heated by the heat generating portion of the ignition means, and burns.
- the generated combustion gas is pushed out along the downstream side wall surface of the housing by the exhaust gas newly flowing into the combustion chamber, and is led from the communication hole to the wall surface of the exhaust pipe extending along the downstream side wall surface of the housing. It flows into the exhaust passage again.
- the housing further defines a fuel injection chamber that is further recessed from a portion of the upstream side wall surface of the housing away from the communication port and communicates with the combustion chamber, and the fuel addition valve defines the fuel injection chamber.
- the fuel may be injected into the combustion chamber.
- the heat generating part of the ignition means close to the downstream side wall surface of the housing.
- the exhaust gas purification device may be connected to an exhaust pipe positioned downstream of the exhaust passage from the housing.
- the exhaust gas heater extends along the downstream side wall surface of the housing.
- the exhaust gas heater can be efficiently discharged from the combustion chamber to the exhaust passage again.
- exhaust stagnation in the combustion chamber is unlikely to occur, and a decrease in oxygen concentration in the combustion chamber can be avoided, and misfire of the ignited fuel is suppressed and combustion gas is efficiently transferred to the exhaust passage. Can be sent out.
- the posture of the fuel addition valve is set so that the fuel injected from the fuel addition valve collides with the downstream side wall surface of the housing and bounces back to the exhaust passage side, the fuel injected from the fuel addition valve stays in the combustion chamber Or it does not remain, and this can be more reliably guided to the exhaust passage.
- the downstream side wall surface of the housing is heated and heated by the heat generating portion, so that vaporization of the fuel attached thereto can be promoted, Combustion efficiency can be increased.
- the heated exhaust gas can be led to the exhaust purification device to efficiently activate and maintain the active state. it can.
- FIG. 1 is a conceptual diagram of an engine system in an embodiment in which the present invention is applied to a vehicle mounted on a compression ignition type multi-cylinder internal combustion engine.
- FIG. 2 is a control block diagram of the main part in the embodiment shown in FIG.
- FIG. 3 is an enlarged cross-sectional view of a main part of the exhaust heating apparatus in the embodiment shown in FIG.
- FIG. 4 is a cross-sectional view similar to FIG. 3 in another embodiment of the exhaust heating apparatus according to the present invention.
- Embodiments in which the exhaust heating method according to the present invention is applied to a compression ignition type multi-cylinder internal combustion engine will be described in detail with reference to FIGS.
- the present invention is not limited to such an embodiment, and the configuration can be freely changed according to required characteristics.
- the present invention is also effective for a spark ignition type internal combustion engine in which gasoline, alcohol, LNG (liquefied natural gas) or the like is used as fuel and is ignited by a spark plug.
- FIG. 1 The main part of the engine system in the present embodiment is schematically shown in FIG. 1, and the control block of the main part is schematically shown in FIG.
- a general exhaust turbo supercharger, an EGR device, and the like are omitted as auxiliary equipment of the engine 10. It should be noted that some of the various sensors required for smooth operation of the engine 10 are omitted for convenience.
- the engine 10 in this embodiment is a compression ignition type multi-cylinder internal combustion engine that spontaneously ignites by directly injecting light oil as fuel into the combustion chamber 10a in a compressed state from the fuel injection valve 11.
- a single cylinder internal combustion engine may be used due to the characteristics of the present invention.
- the cylinder head 12 formed with the intake port 12a and the exhaust port 12b facing the combustion chamber 10a has a valve operating mechanism (not shown) including an intake valve 13a for opening and closing the intake port 12a and an exhaust valve 13b for opening and closing the exhaust port 12b. It has been incorporated.
- the previous fuel injection valve 11 facing the center of the upper end of the combustion chamber 10a is also assembled to the cylinder head 12 so as to be sandwiched between the intake valve 13a and the exhaust valve 13b.
- the amount of depression of the accelerator pedal 14 is detected by the accelerator opening sensor 16, and the detection information is output to the ECU 15.
- the ECU 15 is based on information from the accelerator opening sensor 16 and various sensors to be described later, an operation state determination unit 15a for determining the operation state of the vehicle, a fuel injection setting unit 15b, and a fuel injection valve drive unit 15c.
- the fuel injection setting unit 15b sets the fuel injection amount and the injection timing from the fuel injection valve 11 based on the determination result in the operation state determination unit 15a.
- the fuel injection valve drive unit 15c controls the operation of the fuel injection valve 11 so that the amount of fuel set by the fuel injection setting unit 15b is injected from the fuel injection valve 11 at the set time.
- a surge tank 18 is formed in the middle of the intake pipe 17 connected to the cylinder head 12 so as to communicate with the intake port 12a and defining the intake passage 17a together with the intake port 12a.
- a throttle valve 20 for adjusting the opening degree of the intake passage 17 a is incorporated in the intake pipe 17 upstream of the surge tank 18 via a throttle actuator 19.
- An air flow meter 21 that detects the flow rate of the intake air flowing through the intake passage 17a and outputs it to the ECU 15 is attached to the intake pipe 17 upstream of the throttle valve 20.
- the previous ECU 15 further includes a throttle opening setting unit 15d and a throttle valve driving unit 15e.
- the throttle opening setting unit 15d sets the opening of the throttle valve 20 based on the determination result of the previous operation state determination unit 15a in addition to the depression amount of the accelerator pedal 14.
- the throttle valve drive unit 15e controls the operation of the throttle actuator 19 so that the throttle valve 20 has the opening set by the throttle opening setting unit 15d.
- a crank angle sensor 25 that detects the rotational phase of the crankshaft 24c to which the piston 24a is connected via the connecting rod 24b, that is, the crank angle, and outputs it to the ECU 15 is attached to the cylinder block 24 in which the piston 24a reciprocates. It has been. Based on the information from the crank angle sensor 25, the driving state determination unit 15a of the ECU 15 grasps the traveling speed of the vehicle in addition to the rotational phase of the crankshaft 24c and the engine speed in real time.
- the exhaust pipe 23 connected to the cylinder head 12 so as to communicate with the exhaust port 12b defines an exhaust passage 23a together with the exhaust port 12b.
- An exhaust purification device 26 for detoxifying harmful substances generated by combustion of the air-fuel mixture in the combustion chamber 10a is provided in the middle of the exhaust pipe 23 upstream of the silencer (not shown) attached to the downstream end side. It is attached.
- Exhaust purification apparatus 26 of this embodiment includes at least the oxidation catalyst 26a, it is also possible to incorporate the like In addition to this DPF (D iesel P articulate F ilter ) and the NO X storage catalyst.
- the oxidation catalyst 26a is mainly for oxidizing unburned gas contained in the exhaust gas, that is, for burning.
- the intake air supplied from the intake passage 17a into the combustion chamber 10a forms an air-fuel mixture with the fuel injected from the fuel injection valve 11 into the combustion chamber 10a. Then, the piston 24a spontaneously ignites and burns in the vicinity of the compression top dead center of the piston 24a, and the exhaust generated thereby is discharged from the exhaust pipe 23 into the atmosphere through the exhaust purification device 26.
- the exhaust heating device 22 in this embodiment includes a housing 27, a fuel addition valve 28, and a glow plug 29.
- the housing 27 is connected to the engine 10 and is connected in the middle of the exhaust pipe 23 defining the exhaust passage 23 a to define the combustion chamber 30.
- the housing 27 in the present embodiment further defines a fuel injection chamber 31 that is recessed from the portion of the upstream side wall surface 27 U of the housing 27 away from the communication port 23 b formed in the wall of the exhaust pipe 23 and communicates with the combustion chamber 30. To do.
- the fuel injection chamber 31 is recessed from the combustion chamber 30 in the direction along the upstream side of the exhaust passage 23a (left side in FIG. 3), and the nozzle of the fuel addition valve 28 faces this.
- the basic structure of the fuel addition valve 28 is the same as that of the normal fuel injection valve 11. By controlling the energization time, an arbitrary amount of fuel can be supplied from the fuel injection chamber 31 to the combustion chamber 30 at arbitrary time intervals. It can be sprayed in the form of pulses.
- the fuel addition valve 28 injects fuel from the fuel injection chamber 31 into the combustion chamber 30 that communicates with the exhaust passage 23 a through a communication port 23 b formed in the wall of the exhaust pipe 23.
- the fuel injected from the fuel addition valve 28 collides with the downstream side wall 27 D of the housing 27, as bounce to the exhaust passage 23a side through the communication opening 23b, the fuel addition valve for downstream wall 27 D of the housing 27 28 postures are set.
- the fuel addition valve 28 is attached to the housing 27 via a bracket (not shown) so that the set posture is maintained.
- the amount of fuel per one time supplied from the fuel addition valve 28 to the exhaust passage 23a is based on the operating state of the vehicle including the intake air amount and air-fuel ratio detected by the air flow meter 21, and the fuel addition setting unit of the ECU 15 It is set by 15f.
- the fuel addition valve drive unit 15g of the ECU 15 controls the operation of the fuel addition valve 28 so that the amount of fuel set by the fuel addition setting unit 15f is injected from the fuel addition valve 28 at a set cycle.
- the glow plug 29 as the ignition means in the present invention is connected to an on-vehicle power supply (not shown) via a glow plug drive unit 15h of the ECU 15 as an on / off switch. Therefore, switching between energization and non-energization for the glow plug 29 is controlled by the glow plug drive unit 15h of the ECU 15 in accordance with a preset program.
- the glow plug 29 has a heat generating portion 29 a for igniting the fuel injected into the combustion chamber 30.
- the heat generating portion 29 a is disposed close to the downstream side wall surface 27 ⁇ / b> D of the housing 27 so as to be located at the center of the injection region of the fuel injected from the fuel addition valve 28.
- the angle between the upstream-side wall surface 27 U of the housing 27 located on the upstream side of the exhaust passage 23a theta 1 is set to an obtuse angle.
- the upstream-side wall surface 27 U of the housing 27, the distance from the center axis O of the exhaust pipe 23 to the upstream side wall surface 27 U of the housing 27 is inclined to become farther toward the downstream side of the exhaust passage 23a, the angle of inclination It is set to an acute angle.
- a downstream side wall 27 D of the housing 27 located downstream of the exhaust passage 23a also the angle ⁇ 2 is set at an obtuse angle.
- the downstream-side wall surface 27 D of the housing 27, the distance from the center axis O of the exhaust pipe 23 to the downstream side wall 27 D of the housing 27 is inclined so as to approach toward the downstream side of the exhaust passage 23a, and the inclination angle Is set to an acute angle.
- the exhaust heating process is performed. Is executed. That is, the fuel injection from the fuel addition valve 28 described above is performed, and the exhaust gas flowing through the exhaust passage 23a is heated. Therefore, when the engine 10 is in a fuel cut state, fuel is injected from the fuel addition valve 28 into the combustion chamber 30 via the fuel injection chamber 31 as necessary, thereby increasing the temperature of the exhaust flowing through the exhaust passage 23a. The active state of the oxidation catalyst 26a of the exhaust purification device 26 is maintained.
- the exhaust gas flowing through the exhaust passage 23 a along the wall surface of the exhaust pipe 23 is guided from the communication port 23 b to the upstream side wall surface 27 U of the housing 27 extending along the wall surface of the exhaust pipe 23.
- the exhaust gas flowing into the combustion chamber 30 forms a new air-fuel mixture with the fuel injected from the fuel addition valve 28, is heated by the heat generating portion 29a of the glow plug 29, ignites, and burns.
- the resulting combustion gas is pushed along the downstream wall surface 27 D of the housing 27 by the exhaust gas flowing into the new combustion chamber 30, extends along the communicating hole 23b on the downstream side wall 27 D of the housing 27 exhaust It is guided to the wall surface of the pipe 23 and flows into the exhaust passage 23a again.
- a part of the exhaust always flows into the combustion chamber 30 and flows out together with the combustion gas to the exhaust passage 23a, so that the ignition of the fuel is stabilized and the combustion rate is improved, resulting in high combustion diffusion performance. It can be demonstrated.
- the position of the housing 27 attached to the exhaust pipe 23 may be more preferably controlled by arranging the position of the housing 27 in the curved pipe portion instead of the straight pipe portion of the exhaust pipe 23 as in the above-described embodiment.
- FIG. 4 shows the cross-sectional shape of the main part of another embodiment of the exhaust heating apparatus 22 according to the present invention.
- the same reference numerals are given to elements having the same functions as those of the previous embodiment, and they are duplicated. Description is omitted.
- the exhaust pipe 23 includes a first bent tube portion 23c which is curved at a first radius of curvature r 1, in the opposite direction to the first bend portion 23c at a second radius of curvature r 2 It has the 2nd curved pipe part 23d which curves, and the switching part 23e of these 1st and 2nd curved pipe parts 23c and 23d.
- the housing 27 is provided on the outer peripheral side of the first curved pipe portion 23c (in other words, the inner peripheral side of the second curved pipe portion 23d) in the switching portion 23e. That is, the exhaust gas passing through the exhaust passage 23a defined by the first curved pipe portion 23c is set so as to easily flow into the combustion chamber 30 from the communication port 23b due to inertia. At the same time, the gas flowing out from the combustion chamber 30 to the exhaust passage 23a through the communication port 23b crosses the second curved pipe portion 23d so as to collide with the inner wall on the outer peripheral side.
- the length L of the communication port 23b along the flow direction of the exhaust gas flowing through the exhaust passage 23a is set to be longer than the height H from the central axis O of the exhaust pipe 23 to the wall surface of the housing 27 farthest. Yes. This makes it easier for a part of the exhaust gas to flow into the combustion chamber 30.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Materials Engineering (AREA)
- Exhaust Gas After Treatment (AREA)
- Exhaust Silencers (AREA)
- Processes For Solid Components From Exhaust (AREA)
Abstract
Description
10a 燃焼室
11 燃料噴射弁
12 シリンダーヘッド
12a 吸気ポート
12b 排気ポート
13a 吸気弁
13b 排気弁
14 アクセルペダル
15 ECU
15a 運転状態判定部
15b 燃料噴射設定部
15c 燃料噴射弁駆動部
15d スロットル開度設定部
15e スロットル弁駆動部
15f 燃料添加設定部
15g 燃料添加弁駆動部
15h グロープラグ駆動部
16 アクセル開度センサー
17 吸気管
17a 吸気通路
18 サージタンク
19 スロットルアクチュエーター
20 スロットル弁
21 エアーフローメーター
22 排気加熱装置
23 排気管
23a 排気通路
23b 連通口
23c 第1の曲管部
23d 第2の曲管部
23e 切り換わり部
24 シリンダーブロック
24a ピストン
24b 連接棒
24c クランク軸
25 クランク角センサー
26 排気浄化装置
26a 酸化触媒
27 ハウジング
27U 上流側壁面
27D 下流側壁面
28 燃料添加弁
29 グロープラグ
30 燃焼チャンバー
31 燃料噴射室
θ1 排気管の壁面とハウジングの上流側壁面とのなす角
θ2 排気管の壁面とハウジングの下流側壁面とのなす角
O 排気管の中心軸線
r1 第1の曲管部の曲率半径
r2 第2の曲管部の曲率半径
L 排気の流動方向に沿った連通口の長さ
H 排気管の中心軸線から最も遠いハウジングの壁面までの高さ
Claims (5)
- 内燃機関に接続すると共に排気通路を画成する排気管の途中に連結され、燃焼チャンバーを画成するハウジングと、
前記排気管の壁に形成された連通口を介して前記排気通路に連通する前記燃焼チャンバーに燃料を噴射する燃料添加弁と、
前記燃焼チャンバーに噴射された燃料を着火させるための発熱部を有する着火手段と
を具え、前記排気通路を流れる排気の一部を前記連通口から前記燃焼チャンバーへと流入させ、ここで生成する燃焼ガスと共にこれを再び前記連通口から前記排気通路へと流出させるようにした排気加熱装置であって、
前記連通口よりも前記排気通路の上流側に位置して前記連通口に隣接する前記排気管の壁面と、前記排気通路の上流側に位置する前記ハウジングの上流側壁面とのなす角が鈍角に設定され、
前記連通口よりも前記排気通路の下流側に位置して前記連通口に隣接する前記排気管の壁面と、前記排気通路の下流側に位置する前記ハウジングの下流側壁面とのなす角が鈍角に設定されていることを特徴とする排気加熱装置。 - 前記ハウジングは、前記連通口から離れた前記ハウジングの上流側壁面の部分からさらに凹んで前記燃焼チャンバーに連通する燃料噴射室をさらに画成し、前記燃料添加弁は、この燃料噴射室を介して前記燃焼チャンバーに燃料を噴射することを特徴とする請求項1に記載の排気加熱装置。
- 前記燃料添加弁から噴射された燃料が前記ハウジングの下流側壁面に衝突し、前記連通口を通って前記排気通路側へと跳ね返るように、前記ハウジングの下流側壁面に対する前記燃料添加弁の姿勢が設定されていることを特徴とする請求項1に記載の排気加熱装置。
- 前記着火手段の発熱部が前記ハウジングの下流側壁面に近接して配されていることを特徴とする請求項1に記載の排気加熱装置。
- 前記ハウジングよりも排気通路の下流側に位置する前記排気管に排気浄化装置が連結されていることを特徴とする請求項1に記載の排気加熱装置。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012524972A JP5472465B2 (ja) | 2012-01-04 | 2012-01-04 | 排気加熱装置 |
EP12738010.3A EP2801712B1 (en) | 2012-01-04 | 2012-01-04 | Exhaust-heating device |
CN201280000631.2A CN103299041B (zh) | 2012-01-04 | 2012-01-04 | 排气加热装置 |
US13/576,343 US20130167515A1 (en) | 2012-01-04 | 2012-01-04 | Exhaust heating apparatus |
PCT/JP2012/000013 WO2013102948A1 (ja) | 2012-01-04 | 2012-01-04 | 排気加熱装置 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2012/000013 WO2013102948A1 (ja) | 2012-01-04 | 2012-01-04 | 排気加熱装置 |
Publications (1)
Publication Number | Publication Date |
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WO2013102948A1 true WO2013102948A1 (ja) | 2013-07-11 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2012/000013 WO2013102948A1 (ja) | 2012-01-04 | 2012-01-04 | 排気加熱装置 |
Country Status (5)
Country | Link |
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US (1) | US20130167515A1 (ja) |
EP (1) | EP2801712B1 (ja) |
JP (1) | JP5472465B2 (ja) |
CN (1) | CN103299041B (ja) |
WO (1) | WO2013102948A1 (ja) |
Families Citing this family (2)
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DE102017217001A1 (de) * | 2017-09-26 | 2019-03-28 | Bayerische Motoren Werke Aktiengesellschaft | Abgasanlage für eine Brennkraftmaschine |
JP7327182B2 (ja) * | 2020-01-28 | 2023-08-16 | 株式会社豊田自動織機 | 排気浄化装置 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006112401A (ja) * | 2004-10-18 | 2006-04-27 | Denso Corp | 触媒昇温装置 |
JP2010249013A (ja) * | 2009-04-15 | 2010-11-04 | Ihi Corp | バーナ装置 |
JP2011099582A (ja) * | 2009-11-04 | 2011-05-19 | Ihi Corp | バーナ装置 |
JP2011106430A (ja) * | 2009-11-20 | 2011-06-02 | Toyota Motor Corp | 添加弁の設置構造 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1657758A (zh) * | 2004-02-16 | 2005-08-24 | 罗才德 | 汽车尾气处理器 |
JP5581604B2 (ja) * | 2009-04-15 | 2014-09-03 | 株式会社Ihi | バーナ装置 |
JP2011247208A (ja) * | 2010-05-28 | 2011-12-08 | Toyota Motor Corp | 内燃機関 |
-
2012
- 2012-01-04 WO PCT/JP2012/000013 patent/WO2013102948A1/ja active Application Filing
- 2012-01-04 JP JP2012524972A patent/JP5472465B2/ja not_active Expired - Fee Related
- 2012-01-04 US US13/576,343 patent/US20130167515A1/en not_active Abandoned
- 2012-01-04 CN CN201280000631.2A patent/CN103299041B/zh not_active Expired - Fee Related
- 2012-01-04 EP EP12738010.3A patent/EP2801712B1/en not_active Not-in-force
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006112401A (ja) * | 2004-10-18 | 2006-04-27 | Denso Corp | 触媒昇温装置 |
JP2010249013A (ja) * | 2009-04-15 | 2010-11-04 | Ihi Corp | バーナ装置 |
JP2011099582A (ja) * | 2009-11-04 | 2011-05-19 | Ihi Corp | バーナ装置 |
JP2011106430A (ja) * | 2009-11-20 | 2011-06-02 | Toyota Motor Corp | 添加弁の設置構造 |
Non-Patent Citations (1)
Title |
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See also references of EP2801712A4 * |
Also Published As
Publication number | Publication date |
---|---|
EP2801712B1 (en) | 2016-10-05 |
CN103299041B (zh) | 2015-12-02 |
CN103299041A (zh) | 2013-09-11 |
EP2801712A4 (en) | 2014-12-17 |
US20130167515A1 (en) | 2013-07-04 |
EP2801712A1 (en) | 2014-11-12 |
JP5472465B2 (ja) | 2014-04-16 |
JPWO2013102948A1 (ja) | 2015-05-11 |
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