WO2012081062A1 - 内燃機関の排気加熱装置およびその制御方法 - Google Patents
内燃機関の排気加熱装置およびその制御方法 Download PDFInfo
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- WO2012081062A1 WO2012081062A1 PCT/JP2010/007332 JP2010007332W WO2012081062A1 WO 2012081062 A1 WO2012081062 A1 WO 2012081062A1 JP 2010007332 W JP2010007332 W JP 2010007332W WO 2012081062 A1 WO2012081062 A1 WO 2012081062A1
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- exhaust
- passage
- valve
- internal combustion
- combustion engine
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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
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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
- F01N3/18—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
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
- F02B37/004—Engines characterised by provision of pumps driven at least for part of the time by exhaust with exhaust drives arranged in series
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
- F02B37/013—Engines characterised by provision of pumps driven at least for part of the time by exhaust with exhaust-driven pumps arranged in series
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
- F02B37/12—Control of the pumps
- F02B37/18—Control of the pumps by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
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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
- F01N2340/00—Dimensional characteristics of the exhaust system, e.g. length, diameter or volume of the apparatus; Spatial arrangements of exhaust apparatuses
- F01N2340/06—Dimensional characteristics of the exhaust system, e.g. length, diameter or volume of the apparatus; Spatial arrangements of exhaust apparatuses characterised by the arrangement of the exhaust apparatus relative to the turbine of a turbocharger
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/03—Adding substances to exhaust gases the substance being hydrocarbons, e.g. engine fuel
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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 device for increasing the temperature of exhaust gas in order to activate and maintain the exhaust purification device in an internal combustion engine provided with the exhaust purification device.
- Patent Document 1 and Patent Document 2 propose an internal combustion engine incorporating two superchargers having different characteristics in order to cope with a strong demand for improving fuel efficiency of an internal combustion engine incorporating such a supercharger.
- Each includes a first supercharger that functions mainly in the low rotation region of the internal combustion engine and a second supercharger that functions mainly in the other rotation regions, and these are connected in series to the intake and exhaust passages. Or arranged in parallel.
- Patent Document 3 proposes 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, thereby promoting activation of the exhaust gas purification device or maintaining an active state. Is.
- the exhaust heating device generally includes a fuel supply valve that supplies fuel into the exhaust passage, and an ignition device such as a glow plug that generates heated gas by heating and igniting the fuel.
- an ignition device such as a glow plug that generates heated gas by heating and igniting the fuel.
- a small oxidation catalyst is arranged in the exhaust passage downstream of the ignition device in order to increase the temperature of the heated gas. This oxidation catalyst has its own heat generation function and fuel reforming function to a low carbon component, but is different in configuration from the oxidation catalyst used as part of the exhaust purification device.
- the exhaust flow rate basically tends to increase.
- the exhaust temperature is greatly lowered due to heat radiation to the outside and the heat capacity of the exhaust turbine itself.
- the exhaust heating device can be operated only when the exhaust gas flow rate is small, such as when the vehicle is decelerated.
- An object of the present invention is to provide an exhaust heating apparatus capable of stably continuing the ignition of fuel in an internal combustion engine incorporating a two-stage exhaust turbine supercharger.
- the first aspect of the present invention is a first exhaust turbine supercharger and a second exhaust turbine supercharger that is arranged upstream of the exhaust passage and is mainly used in a low speed region of an internal combustion engine. And a first bypass passage that bypasses the exhaust turbine of the first exhaust turbine supercharger and bypasses the exhaust turbine of the second exhaust turbine supercharger.
- Exhaust heating device for heating exhaust gas led from the internal combustion engine to the exhaust gas purification device having a second bypass passage that performs and two on-off valves for independently opening and closing the first and second bypass passages
- the exhaust heating apparatus is configured such that the exhaust passage is located upstream of the junction of the exhaust passage and the second bypass passage and downstream of the exhaust turbine of the second exhaust turbine supercharger.
- Exhaust gas flowing through the exhaust passage is disposed in the exhaust passage downstream of the branch portion of the exhaust passage and the second bypass passage and upstream of the exhaust turbine of the second exhaust turbine supercharger.
- the valve which can adjust the flow volume of this is arranged.
- the opening of the valve is adjusted so that a part of the exhaust is from the second exhaust turbine supercharger. It is led to an exhaust heating device through an exhaust turbine.
- the heated gas generated by the operation of the exhaust heating device joins with the exhaust gas flowing through the second bypass passage at the joining portion of the exhaust passage and the second bypass passage, and flows into the exhaust gas purification device.
- the exhaust heating apparatus is configured to ignite and burn the fuel supply valve for supplying fuel to the exhaust passage and the fuel supplied from the fuel supply valve to the exhaust passage. It may have an ignition means. In this case, an oxidation catalyst can be disposed in the middle of the exhaust passage between the ignition means and the exhaust purification device. Further, when the fuel is ignited using the ignition means, the valve is configured such that the flow rate of the exhaust gas passing through the exhaust turbine of the second exhaust turbine supercharger is smaller than the flow rate of the exhaust gas flowing through the second bypass passage. Moreover, it is preferable to adjust the opening degree.
- an exhaust heating apparatus control method according to the first aspect of the present invention described above, the step of determining whether or not the exhaust purification apparatus is activated, and the detection of the rotational speed of the internal combustion engine.
- the opening degree of the valve in the closed state is adjusted.
- the exhaust gas heating device is operated while the exhaust gas of a predetermined flow rate is also guided to the exhaust turbine of the second exhaust turbine supercharger.
- the heated gas thereby joins the exhaust gas flowing through the second bypass passage at the junction of the exhaust passage and the second bypass passage, and flows into the exhaust purification device.
- the valve when it is determined that the exhaust gas purification device is not activated, the valve is driven so that the set opening degree is reached, and the second exhaust turbine type overpressure is controlled.
- the step of guiding the exhaust gas of a predetermined flow rate to the exhaust turbine of the feeder and operating the exhaust heating device may include a step of driving the second on-off valve so that the second bypass passage is fully opened.
- the exhaust heating device can be stably operated by adjusting the opening of the valve.
- the heated gas can be efficiently mixed with the exhaust flowing through the second bypass passage at the junction with the exhaust passage.
- the heating gas can be heated more efficiently.
- the opening of the valve is adjusted so that the flow rate of the exhaust gas passing through the exhaust turbine of the second exhaust turbine supercharger is smaller than the flow rate of the exhaust gas flowing through the second bypass passage, and the fuel is discharged using the ignition means. When ignited, stable heated gas can be generated more reliably.
- FIG. 1 is a conceptual diagram of an embodiment of an exhaust heating apparatus for an internal combustion engine according to the present invention.
- FIG. 2 is a control block diagram of the main part in the embodiment shown in FIG.
- FIG. 3 is a graph showing the relationship between the engine speed and the turbine speed.
- FIG. 4 is a flowchart showing a control procedure of the exhaust gas heating device in the embodiment shown in FIG.
- Embodiments in which the present invention is applied to a compression ignition internal combustion engine in which a series type two-stage exhaust turbine supercharger is incorporated 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.
- the main part of the engine system in the present embodiment is schematically shown in FIG. 1 and its control block is shown in FIG. 2, but the valve operating mechanism for intake and exhaust, the EGR device, and the like are omitted for convenience.
- the engine 10 in the present embodiment is a compression ignition type multi-cylinder (four cylinders in the illustrated example) internal combustion that spontaneously ignites by directly injecting light oil as fuel into the combustion chamber 12 in a compressed state from the fuel injection valve 11. Is an institution. However, a single cylinder internal combustion engine may be used due to the characteristics of the present invention.
- the amount of depression of the accelerator pedal 13 is detected by an accelerator opening sensor 15, and the detection information is output to the ECU 14 and used for setting the injection amount of fuel from the fuel injection valve 11.
- the intake pipe 17 connected to the engine 10 via the intake manifold 16 defines an intake passage 18 together with the intake manifold 16, and a branch portion with the intake bypass pipe 20 that defines the intake bypass passage 19 on the upstream side and the downstream side thereof. 20d and merging portion 20c. That is, both ends of the intake bypass pipe 20 are connected to the intake pipe 17 by the upstream branching portion 20d and the downstream junction 20c of the intake passage 18.
- the portion of the intake pipe 17 located between the branch portion 20d and the merge portion 20c and the intake bypass pipe 20 are arranged in parallel.
- the intake passage 18 upstream of the branching portion 20d is referred to as a first intake passage 18f for convenience.
- a portion defined by the intake pipe 17 between the branch portion 20d and the merge portion 20c is referred to as a second intake passage 18s for convenience.
- An air flow meter 21 and an intake air temperature sensor 22 are attached to the intake pipe 17 further upstream than the branching portion 20d, and information on the intake air flow rate and the intake air temperature detected by these is output to the ECU 14.
- the ECU 14 corrects the fuel injection amount from the fuel injection valve 11 based on the detection information from the air flow meter 21 and the intake air temperature sensor 22.
- an intercooler 23 that cools intake air in order to increase the filling density of intake air flowing through the intake passage 18, and a throttle valve 24 that adjusts the opening of the intake passage 18.
- the throttle valve 24 has an accelerator so that the opening of the intake passage 18 is corrected by the ECU 14 in accordance with the driving state of the vehicle with respect to the opening of the accelerator pedal 13 whose amount of depression is adjusted by the driver.
- the pedal 13 is electrically connected.
- an intake bypass valve 25 for opening and closing the intake bypass passage 19 is provided in the middle of the intake bypass pipe 20, an intake bypass valve 25 for opening and closing the intake bypass passage 19 is provided.
- a bypass valve drive motor 26 is connected to the intake bypass valve 25, and the ECU 14 controls the operation of the bypass valve drive motor 26 in accordance with the driving state of the vehicle, and switches the opening / closing operation of the intake bypass valve 25.
- the exhaust pipe 28 that defines the exhaust passage 27 has a branch portion 30d and a merge portion 30c with the first exhaust bypass pipe 30 that defines the first exhaust bypass passage 29 on the upstream side and the downstream side thereof. That is, both ends of the first exhaust bypass pipe 30 are connected to the exhaust pipe 28 by the upstream branching portion 30d and the downstream joining portion 30c of the exhaust passage 27.
- a portion of the exhaust passage 27 located between the upstream branch portion 30d and the downstream junction portion 30c of the exhaust passage 27 hereinafter, this portion is referred to as a first exhaust passage 27f for convenience).
- the first exhaust bypass passage 29 is arranged in parallel.
- the first exhaust bypass pipe 30 is provided with a first exhaust bypass valve 31 for opening and closing the first exhaust bypass passage 29, and the opening and closing operation thereof is controlled by the ECU 14 based on the driving state of the vehicle. ing.
- the first exhaust bypass valve 31 in the present embodiment is connected to the previous bypass valve drive motor 26 together with the intake bypass valve 25.
- the first exhaust bypass passage is interlocked with the opening / closing operation of the intake bypass valve 25 almost in reverse. 29 is opened and closed.
- the exhaust pipe 28 located further upstream than the branch portion 30d with the first exhaust bypass pipe 30 is connected to the second exhaust bypass pipe 33 that defines the second exhaust bypass passage 32 on the upstream side and the downstream side thereof. It further has a branch part 33d and a junction part 33c. That is, both ends of the second exhaust bypass pipe 33 are connected to the exhaust pipe 28 by the upstream branching portion 33d and the downstream joining portion 33c of the exhaust passage 27.
- the portion of the exhaust passage 27 located between the upstream branching portion 33d and the downstream junction portion 33c of the exhaust passage 27 (hereinafter referred to as the second exhaust passage 27s for convenience),
- the second exhaust bypass passage 32 is arranged in parallel.
- the second exhaust bypass pipe 33 is provided with a second exhaust bypass valve 34 for opening and closing the second exhaust bypass passage 32, and the opening and closing operation thereof is controlled by the ECU 14 based on the driving state of the vehicle.
- the second bypass valve drive motor 35 is connected to the second exhaust bypass valve 34, and the opening / closing operation of the second exhaust bypass valve 34 is controlled via the second bypass valve drive motor 35.
- the first supercharger 36 is disposed across the first intake passage 18f and the first exhaust passage 26f, the compressor 36a is located in the first intake passage 18f, and the exhaust turbine 36b is the first one. 1 exhaust passage 27f. Accordingly, the first exhaust bypass passage 29 that branches from the first exhaust passage 27f at the branch portion 30d is in a state where it bypasses the exhaust turbine 36b of the first supercharger 36 and is first at the junction 30c downstream thereof.
- the exhaust passage 27f joins the exhaust passage 27 together with the exhaust passage 27f.
- the second supercharger 37 mainly used in the low rotation region of the engine 10 than the first supercharger 36 straddles the second intake passage 18s and the second exhaust passage 26s. It is arranged.
- the compressor 37 a of the second supercharger 37 is located in the second intake passage 18 s, and the exhaust turbine 37 b is located in the second exhaust passage 27 s defined by the second exhaust bypass pipe 33. Accordingly, the second exhaust bypass passage 32 branched from the second exhaust passage 27s at the branch portion 33d is secondly connected at the downstream junction portion 33c while bypassing the exhaust turbine 37b of the second supercharger 37. Together with the exhaust passage 27s, the exhaust passage 27 joins the upstream side of the branch portion 30d.
- An exhaust purification device 38 for detoxifying harmful substances generated by combustion of the air-fuel mixture in the combustion chamber 12 is provided in the exhaust pipe 28 located downstream of the junction 30 c with the first exhaust bypass pipe 30. Are connected.
- Exhaust purification apparatus of the present embodiment 38 is from the upstream side of the exhaust passage 27 and the oxidation catalyst 39 in this order and comprises a three-way catalyst and NO X catalyst, conveniently an oxidation catalyst disposed on the most upstream end 39 Only illustrated. Temperature (hereinafter, this catalyst temperature and described) in this oxidation catalyst 39 catalyst temperature sensor 40 that outputs this by detecting T n the ECU14 is incorporated.
- the second exhaust passage 27s In the middle of the second exhaust passage 27s upstream of the exhaust turbine 37b of the second supercharger 37 and downstream of the branch portion 33d with the second exhaust bypass pipe 33, the second exhaust passage 27s is provided.
- a flow rate adjustment valve 41 that can adjust the flow rate of the flowing exhaust gas is provided. Further, the flow rate adjustment valve 41 is connected to a valve opening degree sensor 42 for detecting the opening degree, and the detection information is output to the ECU 14.
- An adjustment valve drive motor 43 whose operation is controlled by the ECU 14 is also connected to the flow rate adjustment valve 41, and its opening degree is adjusted based on the operating state of the vehicle and detection information from the valve opening degree sensor 42.
- the opening / closing operation of the second exhaust bypass valve 34 by the second bypass valve drive motor 35 is basically driven in reverse to the opening / closing operation of the flow rate adjustment valve 41. More specifically, the second exhaust bypass valve 34 is held in a fully closed state only when the flow rate adjustment valve 41 is in a fully open state. On the other hand, when the exhaust gas is guided to the second exhaust bypass passage 27s, the opening degree of the second exhaust bypass valve 34 and the flow rate adjustment valve 41 is controlled so that the required supercharging pressure is achieved.
- An exhaust heating device 44 is incorporated in the middle of the second exhaust passage 27s downstream of the exhaust turbine 37b of the second supercharger 37 and upstream of the junction 33c with the second exhaust bypass pipe 33. Yes.
- the exhaust gas heating device 44 is for generating a heated gas and supplying it to the exhaust gas purification device 38 disposed on the downstream side to maintain its activation and active state.
- the exhaust heating device 44 in this embodiment includes a fuel supply valve 45, a glow plug 46 as an ignition means in the present invention, and an auxiliary oxidation catalyst 47 in order from the upstream side.
- the fuel supply valve 45 is for supplying fuel into the second exhaust passage 27s, and the ECU 14 supplies the supply timing and supply amount based on the presence / absence of the activated state of the exhaust purification device 38 and the operating state of the vehicle. Is to be controlled.
- the fuel supply operation from the fuel supply valve 45 into the second exhaust passage 27s is performed when the exhaust purification device 38 is in an inactive state. Accordingly, the exhaust heating device 44 is operated as necessary even in an operation state in which exhaust does not need to be guided to the second exhaust passage 27s, that is, an operation state in which the second supercharger 37 is not required to function. . Further, even in an operation state in which exhaust is guided to the second exhaust passage 27s and the second supercharger 37 is functioning, the exhaust heating device 44 is operated as necessary.
- the glow plug 46 is for igniting the fuel supplied from the fuel supply valve 45 into the second exhaust passage 27s when it does not spontaneously ignite.
- the glow plug 46 is connected to a DC power source (not shown) for supplying power to the glow plug 46 and a booster circuit, and its surface temperature is controlled by the ECU 14.
- a ceramic heater or the like instead of the glow plug 46 as the ignition means of the present invention.
- the auxiliary oxidation catalyst 47 is arranged in the middle of the exhaust passage 27 between the glow plug 46 and the exhaust purification device 38.
- the auxiliary oxidation catalyst 47 is disposed in the second exhaust passage 27s on the upstream side of the merging portion 33c, but may be disposed on the exhaust passage 27 on the downstream side of the merging portion 33c. is there.
- the auxiliary oxidation catalyst 47 has a cross-sectional area smaller than the cross-sectional area of the second exhaust passage 27 s, and thus allows a part of the exhaust gas to pass without passing through the auxiliary oxidation catalyst 47.
- the flow rate of the exhaust gas that passes through the auxiliary oxidation catalyst 47 is lower than the flow rate of the exhaust gas that does not pass through the auxiliary oxidation catalyst 47, and the temperature of the exhaust gas that passes through the auxiliary oxidation catalyst 47 can be further increased.
- the auxiliary oxidation catalyst 47 is at a sufficiently high temperature, that is, in an activated state, the glow plug 46 can be turned off, and the air-fuel mixture can be directly combusted in the auxiliary oxidation catalyst 47.
- the auxiliary oxidation catalyst 47 is not activated, such as when the engine 10 is cold-started, it is necessary to energize the glow plug 46.
- auxiliary oxidation catalyst 47 when the auxiliary oxidation catalyst 47 reaches a high temperature, hydrocarbons having a large number of carbon atoms in the unburned mixture are decomposed and reformed into highly reactive hydrocarbons having a small number of carbon atoms.
- the auxiliary oxidation catalyst 47 functions as a rapid heating element that generates heat rapidly on the one hand, and also functions as a fuel reforming catalyst that generates reformed fuel on the other hand.
- an auxiliary temperature sensor 48 that detects the temperature of the auxiliary oxidation catalyst 47 (hereinafter referred to as auxiliary catalyst temperature) T Sn and outputs the detected temperature to the ECU 14 is provided.
- the ECU 14 determines whether or not the glow plug 46 is energized based on detection information from the auxiliary temperature sensor 48.
- the vaporization promoting member has a function of accelerating fuel atomization, that is, vaporization by scattering the fuel injected from the fuel supply valve 45 and colliding it.
- the characteristics of the first and second superchargers 36 and 37 in this embodiment are shown in FIG.
- Relatively inertial mass of the large first supercharger 36 describes the engine rotational speed, i.e. the engine speed per unit time N n is the predetermined rotational speed N R (hereinafter to as boost condition judgment rotation speed ) Almost no supercharging capacity in the area below.
- the engine rotational speed N n supercharging state judgment rotation speed N R above area is an area where the first supercharger 36 exerts supercharging capacity.
- the second supercharger 37 having a relatively small inertial mass exhibits a supercharging capability from a low engine speed region where the first supercharger 36 does not function.
- ECU 14 when the engine speed N n is less than boost condition judgment rotation speed N R, actuating the second supercharger 37 without operating the first supercharger 36.
- the first exhaust bypass valve 31 and the flow rate adjustment valve 41 are basically maintained in a substantially fully opened state, and the intake bypass valve 25 and the second exhaust bypass valve 34 are maintained in a fully closed state.
- the engine rotational speed N n is in the case of more than boost condition judgment rotation speed N R actuates the first supercharger 36 without operating the second supercharger 37.
- the first exhaust bypass valve 31 and the flow rate adjustment valve 41 are held in a fully closed state, and the intake bypass valve 25 and the second exhaust bypass valve 34 are basically held in a substantially fully opened state.
- the crank angle phase of the engine 10 is detected by the crank angle sensor 49, and the detected information is output to the ECU 14.
- the ECU 14 determines the engine speed N based on the information from the crank angle sensor 49. n is calculated.
- the second exhaust bypass valve 41 is configured such that the flow rate adjustment valve 41 is slightly throttled from the fully open state or slightly opened from the fully closed state and the amount of exhaust to be supplied to the second exhaust passage 27s is guided. 34 is controlled. As a result, the fuel injected from the fuel supply valve 45 into the second exhaust passage 27s is ignited by the glow plug 46 and becomes a heated gas without misfiring at the junction 33c with the second exhaust bypass pipe 33. The exhaust gas flowing from the second exhaust bypass passage 32 is mixed. Then, activation of the exhaust purification device 38 is promoted.
- the ECU 14 controls the operation of the intake bypass valve 25, the first and second exhaust bypass valves 31, 34, the flow rate adjustment valve 41, the exhaust heating device 44, that is, the fuel supply valve 45 and the glow plug 46. Control for these is performed as follows according to a preset program based on the driving state of the vehicle and detection signals from the auxiliary temperature sensor 48 and the catalyst temperature sensor 40. That is, based on the detection signal from the catalyst temperature sensor 40, the temperature of the temperature T n of the oxidation catalyst 39 is indicative of their activation (hereinafter referred to as the activation index temperature this) of less than T R, the exhaust gas purification It is determined that the device 38 is not activated, and the exhaust heating device 44 is activated.
- the catalyst temperature T when n is greater than its activation index temperature T R the exhaust purification device 38 stops the operation of the exhaust heat system 44 is determined to be activated. Further, if the temperature T Sn of the auxiliary oxidation catalyst 47 is lower than the temperature that becomes an activation index (hereinafter referred to as the activation index temperature) TSR , it is determined that the auxiliary oxidation catalyst 47 is not activated. Then, the glow plug 46 is energized. Conversely, when the auxiliary catalyst temperature T Sn is equal to or higher than the activation index temperature T SR, it is determined that the auxiliary oxidation catalyst 47 is activated, and the energization to the glow plug 46 is stopped.
- the activation index temperature the temperature that becomes an activation index
- the engine speed N n may operate the exhaust heating device 44 in the boost state judgment rotation speed N R above state, held in the flow control valve 41 is slightly opened in a fully closed state Good. That is, the intake bypass valve 25 and the second exhaust bypass valve 34 can be kept fully open and the first exhaust bypass valve 31 can be kept fully closed. In this way, part of the exhaust gas is guided to the second exhaust passage 27s, enabling fuel to be ignited and preventing its misfire (for example, the characteristic is as indicated by arrow A in FIG. 3).
- the opening degree of the flow rate adjusting valve 41 is adjusted so that the fuel supplied from the fuel supply valve 45 of the exhaust heating device 44 to the second exhaust passage 27s does not misfire. That is, the flow rate of the exhaust led to the second exhaust passage 27s is made smaller than the flow rate of the exhaust flowing through the second exhaust bypass passage 32. More specifically, the opening degree of the flow rate adjustment valve 41 is adjusted so that the exhaust gas having a flow rate at which the flame generated by the ignition of the fuel in the second exhaust passage 27s does not misfire flows through the second exhaust passage 27s. It is set by the ECU 14 via the valve drive motor 43. As a result, exhaust at a predetermined flow rate that does not cause misfire can be caused to flow through the second exhaust passage 27 s, and the heated gas obtained by the exhaust heating device 44 can be guided to the exhaust purification device 38.
- the control procedure of the exhaust heating device 44 is shown in the flowchart of FIG. That is, it is determined whether the temperature T n of the oxidation catalyst 39 detected by the catalyst temperature sensor 40 in step S11 is less than its activation index temperature T R.
- the catalyst temperature T n is the activation index temperature T R above, that is, when the oxidation catalyst 39 has determined that there is no need to operate the exhaust heating device 44 because it is in an active state, without any of the S11
- the determination process at the step is repeated.
- step S12 it is determined whether or not the temperature T Sn of the auxiliary oxidation catalyst 47 detected by the auxiliary temperature sensor 48 is lower than the activation index temperature T SR .
- step S13 it is determined whether a flag for energizing the glow plug 46 is set. Initially, since this flag is not set, the process proceeds to step S14 to set the flag and energize the glow plug 46 in step S15. Then, the intake bypass valve 25, the first step of S15, the set based on the opening and closing state of the second exhaust bypass valve 31, 34 and flow control valve 41 to the engine speed N n.
- the intake bypass valve 25 when the engine speed N n is the boost condition determination than the rotational speed N R, the intake bypass valve 25, whereas the second exhaust bypass valve 34 is in the fully closed state, the first exhaust bypass valve 31, The flow rate adjustment valve 41 is held in a fully open state. Therefore, when the fuel supplied to the second exhaust passage 27s is ignited by the glow plug 46, the opening degree of the flow rate adjustment valve 41 and the second exhaust bypass valve 34 is controlled so that the flow rate is such that it does not misfire. Is done. More specifically, the flow rate adjustment valve 41 is throttled from the fully open state, and the opening degree of the second exhaust bypass valve 34 is controlled so that a necessary amount of exhaust is guided to the second exhaust passage 27s.
- the flow rate of the exhaust gas flowing through the second exhaust passage 27s is reduced, and the remaining exhaust gas is guided to the first exhaust bypass passage 32.
- the intake bypass valve 25 whereas the second exhaust bypass valve 34 is in the fully open state, the first exhaust bypass valve 31 and flow rate
- the adjustment valve 41 is held in a fully closed state. Therefore, the flow rate adjustment valve 41 is slightly opened from the fully closed state so that the fuel supplied to the second exhaust passage 27s is ignited, and part of the exhaust gas is also guided to the second exhaust passage 27s.
- step S17 fuel is injected from the fuel supply valve 45 into the second exhaust passage 27s.
- the fuel is ignited in the second exhaust passage 27 s through which the exhaust gas slightly flows, and the resulting heated gas is further heated by the auxiliary oxidation catalyst 47.
- the exhaust gas flowing from here is mixed at the junction 33c with the first exhaust bypass passage 32 and guided to the exhaust gas purification device 38, whereby the temperature of the exhaust gas purification device 38 is increased.
- the catalyst temperature T n detected by the catalyst temperature sensor 40 in S18 in step is equal to or its activation index temperature T R above.
- the catalyst temperature T n is less than the activation index temperature T R, that is, when the oxidation catalyst 39 is determined that it is necessary to continue the operation of the exhaust heating device 44 because it is in an inactive state, the step S12 Return and repeat the previous process.
- the catalyst temperature T n is the activation index temperature T R above, that is, when the oxidation catalyst 39 is determined that it is necessary to stop the operation of the exhaust heating device 44 so becomes activated, proceeds to step S19, To do.
- step S19 it is determined whether or not the flag is set. If it is determined that the flag is set, the energization of the glow plug 46 is stopped in step S20, and then the step S21 is performed. Reset the flag.
- step S22 the valve opening control in step S16 is terminated, and the process returns to the determination step in S11 again.
- the intake bypass valve 25 and first, second exhaust bypass valve 31, 34 and flow rate The open / close state of the regulating valve 41 is controlled.
- step S13 if the flag is set in the previous step S13, that is, if it is determined that the glow plug 46 is energized, the process proceeds to step S16 and the operation of the exhaust heating device 44 is continued.
- step S12 it is determined that it is not necessary to energize the glow plug 46 because the auxiliary catalyst temperature T Sn is equal to or higher than the activation index temperature T SR , that is, the auxiliary oxidation catalyst 47 is in an active state. If so, the process proceeds to step S23.
- step S23 it is determined whether or not a flag is set. If it is determined that the flag is set, that is, energization of the glow plug 46 is performed, the process proceeds to S24 to stop energization of the glow plug 46, and then the flag is reset in step S21. Thereafter, the process proceeds to step S16 and the operation of the exhaust heating device 44 is continued. On the other hand, if it is determined that the flag is not set in step S23, that is, the glow plug 46 is in a non-energized state, the process proceeds to step S16 and the operation of the exhaust heating device 44 is continued. .
- the exhaust heating device 44 can be operated in an arbitrary operation state.
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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 After Treatment (AREA)
- Supercharger (AREA)
Abstract
Description
11 燃料噴射弁
12 燃焼室
13 アクセルペダル
14 ECU
15 アクセル開度センサー
16 吸気マニホールド
17 吸気管
18 吸気通路
18f 第1の吸気通路
18s 第2の吸気通路
19 吸気バイパス通路
20 吸気バイパス管
20d 分岐部
20c 合流部
21 エアーフローメーター
22 吸気温センサー
23 インタークーラー
24 スロットル弁
25 吸気バイパス弁
26 バイパス弁駆動モーター
27 排気通路
27f 第1排気通路
27s 第2排気通路
28 排気管
29 第1排気バイパス通路
30 第1排気バイパス管
30d 分岐部
30c 合流部
31 第1排気バイパス弁
32 第2排気バイパス通路
33 第2排気バイパス管
33d 分岐部
33c 合流部
34 第2排気バイパス弁
35 第2バイパス弁駆動モーター
36 第1の過給機
36a コンプレッサー
36b 排気タービン
37 第2の過給機
37a コンプレッサー
37b 排気タービン
38 排気浄化装置
39 酸化触媒
40 触媒温度センサー
41 流量調整弁
42 弁開度センサー
43 調整弁駆動モーター
44 排気加熱装置
45 燃料供給弁
46 グロープラグ
47 補助酸化触媒
48 補助温度センサー
49 クランク角センサー
Nn エンジン回転数
NR 過給状態判定回転数
Tn 触媒温度
TR 活性化指標温度
TSn 補助触媒温度
TSR 活性化指標温度
Claims (6)
- 第1の排気タービン式過給機およびこれよりも排気通路の上流側に配されて内燃機関の低回転領域にて主として用いられる第2の排気タービン式過給機が前記排気通路中に直列に組み込まれ、前記第1の排気タービン式過給機の排気タービンを迂回する第1のバイパス通路と、前記第2の排気タービン式過給機の排気タービンを迂回する第2のバイパス通路と、これら第1および第2のバイパス通路をそれぞれ独立に開閉するための2つの開閉弁とを有する内燃機関から排気浄化装置に導かれる排気を加熱するための排気加熱装置であって、この排気加熱装置は、
前記排気通路と前記第2のバイパス通路との合流部よりも上流かつ前記第2の排気タービン式過給機の排気タービンよりも下流に位置する前記排気通路に配され、
前記排気通路と前記第2のバイパス通路との分岐部よりも下流かつ前記第2の排気タービン式過給機の排気タービンよりも上流の前記排気通路には、この排気通路を流れる排気の流量を調整し得る弁が配されていることを特徴とする内燃機関の排気加熱装置。 - 排気加熱装置は、前記排気通路に燃料を供給するための燃料供給弁と、この燃料供給弁から前記排気通路に供給された燃料を着火させて燃焼させるための着火手段とを有することを特徴とする請求項1に記載の内燃機関の排気加熱装置。
- 前記着火手段と前記排気浄化装置との間の前記排気通路の途中に酸化触媒を配したことを特徴とする請求項2に記載の内燃機関の排気加熱装置。
- 前記着火手段を用いて燃料を着火させる場合、前記弁は、前記第2の排気タービン式過給機の排気タービンを通過する排気の流量が前記第2のバイパス通路を流れる排気の流量よりも少なくなるように、その開度が調整されることを特徴とする請求項2または請求項3に記載の内燃機関の排気加熱装置。
- 請求項1から請求項4の何れかに記載の排気加熱装置の制御方法であって、
排気浄化装置の活性化の有無を判定するステップと、
内燃機関の回転速度を検出するステップと、
検出された前記内燃機関の回転速度に基づいて前記弁の開度を設定するステップと、
前記排気浄化装置が活性化していないと判断した場合、設定された開度となるように前記弁を駆動して前記第2の排気タービン式過給機の排気タービンに所定流量の排気を導くと共に排気加熱装置を作動させるステップと
を具えたことを特徴とする排気加熱装置の制御方法。 - 前記排気浄化装置が活性化していないと判断した場合、設定された開度となるように前記弁を駆動して前記第2の排気タービン式過給機の排気タービンに所定流量の排気を導くと共に排気加熱装置を作動させるステップは、前記第2のバイパス通路が全開状態となるように、前記第2の開閉弁を駆動するステップを含むことを特徴とする請求項5に記載の排気加熱装置の制御方法。
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CN2010800706433A CN103270273A (zh) | 2010-12-17 | 2010-12-17 | 内燃机的排气加热装置及其控制方法 |
US13/991,319 US20130255230A1 (en) | 2010-12-17 | 2010-12-17 | Exhaust heating device for internal combustion engine and control method therefor |
JP2012548550A JPWO2012081062A1 (ja) | 2010-12-17 | 2010-12-17 | 内燃機関の排気加熱装置およびその制御方法 |
PCT/JP2010/007332 WO2012081062A1 (ja) | 2010-12-17 | 2010-12-17 | 内燃機関の排気加熱装置およびその制御方法 |
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Cited By (3)
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GB2507720A (en) * | 2012-09-28 | 2014-05-14 | T Baden Hardstaff Ltd | Exhaust heater upstream of oxidation catalyst |
KR20150143349A (ko) * | 2014-06-12 | 2015-12-23 | 게 옌바허 게엠베하 운트 콤파니 오게 | 내연기관의 작동방법 |
JP2018193952A (ja) * | 2017-05-19 | 2018-12-06 | トヨタ自動車株式会社 | 内燃機関の排気浄化システム |
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US20130186074A1 (en) * | 2010-07-07 | 2013-07-25 | Toyota Jidosha Kabushiki Kaisha | Internal combustion engine |
GB2532251A (en) * | 2014-11-13 | 2016-05-18 | Gm Global Tech Operations Llc | Internal combustion engine having a two stage turbocharger |
CN106930850B (zh) * | 2015-12-29 | 2020-07-03 | 长城汽车股份有限公司 | 双燃料发动机***及其控制方法、车辆 |
DE102016212249B4 (de) * | 2016-07-05 | 2024-05-02 | Ford Global Technologies, Llc | Zweistufig aufladbare direkteinspritzende Brennkraftmaschine mit Abgasnachbehandlung und Verfahren zum Betreiben einer derartigen Brennkraftmaschine |
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US20130255230A1 (en) | 2013-10-03 |
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