WO2002095197A1 - Dispositif d'echappement comportant des moyens pour purifier les gaz d'echappement d'un moteur diesel - Google Patents
Dispositif d'echappement comportant des moyens pour purifier les gaz d'echappement d'un moteur diesel Download PDFInfo
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- WO2002095197A1 WO2002095197A1 PCT/JP2002/004974 JP0204974W WO02095197A1 WO 2002095197 A1 WO2002095197 A1 WO 2002095197A1 JP 0204974 W JP0204974 W JP 0204974W WO 02095197 A1 WO02095197 A1 WO 02095197A1
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- exhaust
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- engine
- exhaust gas
- intake
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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
- 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
- F01N13/02—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate silencers in series
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
- F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric 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
- F01N3/02—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
- F01N3/0231—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 special exhaust apparatus upstream of the filter for producing nitrogen dioxide, e.g. for continuous filter regeneration systems [CRT]
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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
- F01N3/0235—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 exhaust gas throttling 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
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
- F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/0261—Controlling the valve overlap
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/0273—Multiple actuations of a valve within an engine cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
- F02D41/029—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a particulate filter
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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
- F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
- F01N2260/14—Exhaust treating devices having provisions not otherwise provided for for modifying or adapting flow area or back-pressure
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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
- F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
- F01N2430/10—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics by modifying inlet or exhaust valve timing
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
- F02D2041/001—Controlling intake air for engines with variable valve actuation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
- F02D2041/0022—Controlling intake air for diesel engines by throttle control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/04—Engine intake system parameters
- F02D2200/0404—Throttle position
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1446—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being exhaust temperatures
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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 gas purifying apparatus for removing particulates in exhaust gas of a diesel engine.
- PM Patty Cattle Urate
- DPF Diesel Particulate Filter
- the collected PM accumulates on the DPF installed in the vehicle equipped with the diesel engine as the engine is repeatedly operated, and it is necessary to regenerate the DPF by burning the collected PM. .
- As a means for this regeneration there is a method in which PM is burned by heating with an electric heater or a wrench, etc. According to this method, multiple DPFs are arranged in parallel in the exhaust passage to alternately collect and burn. The system to be performed.
- the oxidation catalyst ' is disposed in the exhaust passage upstream of the DPF, by oxidizing N 0 in the exhaust gas to N_ ⁇ 2 by the oxidation catalyst, the N 0 2
- a method of continuously burning while collecting PM that is, a so-called continuous regeneration type DPF has also been studied, and is disclosed in, for example, Japanese Patent No. 3012249.
- an N.X storage / reduction catalyst described in Japanese Patent No. 2604002 is supported on the DPF to store and reduce N0X.
- a method of continuously burning collected PM using the generated active oxygen is also known.
- these continuous regenerative DPFs burn PM in a low temperature range of 250 ° to 400 ° C (it fluctuates somewhat depending on the catalyst material), so special heaters such as electric heaters and burners are used. It is not necessary to provide a simple heating means, It has the advantage that it can be implemented.
- PM can be burned in the so-called catalyst active temperature range which can be easily achieved by the engine exhaust gas temperature, but it does not fall into this temperature range depending on the operating state of the engine. Operating conditions can occur. In particular, when the engine load is low, the exhaust gas temperature may not rise and reach 250 ° C. In addition, when the engine load is high, the exhaust gas temperature may exceed the active temperature range, and continuous combustion of PM cannot be performed. was there.
- the exhaust gas temperature does not enter the active temperature region of the catalyst, and unless the PM collected by the DPF is burned, the PM is not burned to the DPF and is accumulated as collected.
- the PM changes the operating state of the engine and enters the active temperature region of the catalyst, the PM is burned by the above-described action.
- the combustion temperature of the PM reaches 2000 ° C., which causes a problem such as melting of the filter body.
- the continuous regeneration type DPF performs regeneration continuously when exhaust gas flows while collecting PM. Therefore, it is important to keep the exhaust gas temperature in the above-mentioned catalyst active temperature range, because if the DPF is continuously regenerated continuously during engine operation, the temperature will not reach the temperature that would cause erosion. .
- Japanese Patent Application No. 2000-1855897 discloses that an intake throttle valve and a variable turbocharger as air amount adjusting means are provided, and the intake throttle valve is throttled.
- the exhaust gas temperature is controlled by reducing the intake air amount and controlling the variable air conditioner to increase the intake air amount.
- Japanese Patent Application No. 2001-792926 discloses that the so-called EGR passage that communicates from the exhaust passage of the engine to the intake passage and the EGR valve that controls the passage area of the EG passage provides exhaust gas. Controls the flow rate of EGR gas that is recirculated from the recirculation (EGR) passage to the suction passage, and further restricts the amount of intake air by the intake shutter in the intake passage and the exhaust shutter in the exhaust passage. This controls the exhaust gas temperature.
- EGR recirculation
- the diesel engine is a well-known combustion system using compression self-ignition.
- the intake air is compressed based on the cylinder bore diameter and the compression ratio of the cylinder defined by the piston stroke, and fuel is injected into the cylinder heated by compression to raise the temperature of the fuel itself. Self-ignites while evaporating.
- the above-described method of reducing the amount of intake air impedes the temperature rise of the intake air due to compression and creates conditions that make it difficult for self-ignition to occur.
- incomplete combustion in the cylinder is induced, and new problems such as emission of unburned H C (hide ⁇ carbon) occur.
- Fig. 9 is a graph showing the effect of reducing the intake shutter.
- the vertical axis shows the exhaust temperature C) and HC (X100 ppm), and the horizontal axis shows the intake air volume [kg / h].
- the amount of intake air is limited by gradually reducing the intake shutter.
- the solid line in the graph shows the so-called conventional change in exhaust temperature and the measurement of HC contained in exhaust gas when only the intake shutter is operated.
- the measurement data of Figure 9, with 3 Li jitter one diesel engine of 4-cylinder, operating state engine speed (N e) 1 0 0 0 r pms fuel injection amount (Q) of 1 0 mm 3 /
- the exhaust temperature was detected as the exhaust manifold outlet temperature.
- the present invention has been made in view of the above points, and its main technical problem is that in a diesel engine exhaust purification device equipped with a continuously regenerating type DPF, an operation state in which the exhaust gas temperature is low without deteriorating combustion. Even in this case, the exhaust gas temperature is raised to continuously promote the combustion of PM in the continuously regenerating DPF, so that the PM is prevented from accumulating in the DPF. Disclosure of the invention
- a diesel exhaust purifying apparatus including a continuous regeneration type diesel-powered particulate filter disposed in an exhaust passage of an engine.
- An intake shutter located in the intake passage of the engine
- Exhaust temperature range detection means for detecting an exhaust temperature range of the engine
- control means for controlling the opening degree of the intake shutter to be narrowed
- An exhaust valve operating mechanism having an exhaust introducing mechanism for opening an exhaust valve of the engine for a short period of time during an intake stroke, and an exhaust gas purifying apparatus for a diesel engine.
- an exhaust gas purifying apparatus for a diesel engine including a continuous regeneration diesel particulate filter disposed in an exhaust passage of the engine,
- An intake shutter located in the intake passage of the engine
- An exhaust introduction mechanism that opens the exhaust passage to the cylinder during the intake stroke
- Exhaust temperature range detection means for detecting an exhaust temperature range of the engine; If the exhaust gas temperature range of the engine detected by the exhaust gas temperature range detecting means is lower than a predetermined temperature range, the opening degree of the intake shutter is reduced and the exhaust gas introducing device ⁇ i is operated. And an exhaust gas purifying apparatus for a diesel engine.
- the control means reduces the opening degree of the intake shutter as the temperature range becomes lower. It is desirable to control it.
- An exhaust shutter is provided in the exhaust passage to narrow the exhaust passage, and the control means is configured to open the exhaust shutter when the exhaust temperature detected by the exhaust temperature region detecting means is in a low temperature range. It is desirable to control so as to narrow down.
- the opening degree of the exhaust shutter is controlled stepwise so as to decrease as the temperature region decreases.
- FIG. 1 is a block diagram of a configuration of a diesel engine exhaust gas purification apparatus configured according to the present invention.
- FIG. 2 is a diagram showing an embodiment of an exhaust gas introduction mechanism according to the present invention.
- FIG. 3 is a diagram showing lift curves of an intake valve and an exhaust valve in the configuration of FIG.
- FIG. 4 is a view showing another embodiment of the exhaust gas introducing mechanism according to the present invention.
- FIG. 5 is an exhaust gas temperature range map according to the present invention.
- FIG. 6 is a control map for each exhaust gas temperature range in the present invention.
- FIG. 7 is an opening control map of the intake and exhaust shutters according to the present invention.
- FIG. 8 is a control flowchart of control means in the present invention.
- Fig. 9 is a graph showing the effects of the intake shutter, exhaust two-stage cam, and exhaust shutter.
- the engine shown in Fig. 1 consists of a cylinder block and a cylinder head.
- the main body 2 is provided with an intake manifold 3 forming part of an intake passage and an exhaust manifold 4 forming part of an exhaust passage.
- the intake manifold 3 is connected to an intake pipe 5 constituting a part of an intake passage, and an air cleaner 6 for purifying intake air is arranged at the most upstream portion of the intake pipe 5. .
- the intake air purified by the air cleaner 6 passes through the intake pipe 5 and is supplied to the cylinder 1 as shown in FIG.
- An exhaust pipe 7 forming a part of an exhaust passage is connected to the exhaust manifold 4, and the exhaust gas generated in the cylinder 1 is exhausted through the exhaust manifold 4 and the exhaust pipe 7.
- the exhaust pipe 5 is provided with an intake shutter 9, and the exhaust pipe 7 is provided with an exhaust shutter 11.
- Each of the intake shutter 9 and the exhaust shutter 11 includes an air actuator connected to an air tank (not shown), and the control means 10 controls the actuator.
- the exhaust pipe 7 of the diesel engine shown in the figure includes a continuously regenerating diesel particulate filter (continuously regenerating DPF) 1 and an N 0 X catalyst, which consist of an oxidation catalyst 121 and a DPF 122 in this order from the upstream side. 14 are arranged.
- the oxidation catalyst 122 is formed, for example, by coating activated alumina or the like on the surface of a honeycomb-shaped carrier or a carrier made of heat-resistant steel to form a wet coat layer, and forming a white coat layer on the coat layer. What carries a catalytically active component composed of a noble metal such as gold, palladium or rhodium is used.
- the oxidation catalyst 1 2 1, together with to produce N_ ⁇ 2 by oxidizing N_ ⁇ in the exhaust gas, is oxidized to produce H 2 0 and C 0 2 of HC and CO in the exhaust gas.
- the DPF 122 is a so-called wall-flow type honeycomb filter in which a large number of cells are formed in parallel with, for example, porous cored light or silicon carbide, and the inlets and outlets of the cells are alternately closed.
- a fibrous filter made by winding ceramic fibers in multiple layers around a stainless steel perforated tube is used to trap PM in exhaust gas.
- the NO x catalyst 1 4 the configuration and components can be used similar as the above oxidation catalyst 1 2 1, is based on changing the N_ ⁇ _X such N 0 in the exhaust gas to N 2 and H 2 0.
- Such continuous regeneration type DPF 1 2 may flow into the N 0 in the exhaust gas by the oxidation catalyst 1 2 1 is oxidized to N 0 2, the DPF 1 2 2 which is disposed downstream of the oxidation catalyst 1 2 1 burning the PM collected by the N 0 2 to.
- the diesel engine shown is an engine speed (Ne) sensor 15 that detects the engine speed, an accelerator sensor 16 that detects the amount of accelerator pedal depression (accelerator opening: ACL), and an intake manifold.
- the intake air temperature sensor 17 is provided in the cylinder 3 and detects the temperature of the intake air drawn into the cylinder.
- the exhaust temperature sensor 8 is provided in the exhaust pipe 7 and detects the exhaust temperature.
- Control means 10 is provided for controlling the amount of fuel injected into the cylinder by a fuel injection device (not shown) based on the detection signal.
- the control means 10 includes a memory storing a fuel injection amount map (not shown) in which a combustion injection amount (not shown) is set using the engine rotation speed and the accelerator opening as parameters.
- the engine rotation speed detection sensor 15 and The basic fuel injection amount is determined based on the detection signal from the accelerator sensor 16. Then, the control means 10 corrects the basic fuel injection amount based on the detection value of the intake air temperature sensor 15 to determine the final fuel injection amount. It should be noted that the final fuel injection amount can be corrected as needed by referring to not only the intake air temperature but also various other parameters (such as atmospheric pressure and smoke limit injection amount).
- the diesel engine of this embodiment is provided with an exhaust introduction mechanism (so-called exhaust two-stage cam mechanism) that opens the exhaust passage of the cylinder during the intake stroke to the cylinder.
- FIG. 2 shows an intake valve 30 and an intake valve operating mechanism 31, and an exhaust valve 40 and an exhaust valve operating mechanism 41.
- the exhaust valve mechanism 42 that constitutes the exhaust valve operating mechanism 41 is a normal force filter that activates the exhaust valve 40 during the exhaust stroke, and the cam profile 4 21 and the rear side in the rotational direction.
- An exhaust introduction camp 1 o file 422 formed with a phase angle of about 90 ° is provided. As shown in FIG.
- the exhaust power mechanism 42 constructed as described above has an exhaust valve lift curve (1) by the cam profile 421, and an exhaust valve lift curve (1) during the intake stroke (the intake valve assembly by the intake valve operating mechanism 31).
- the exhaust valve 40 is operated with the exhaust valve lift curve (2) based on the exhaust introduction cam profile 4 22 in a short period of time (during the period when the foot force is high). Therefore
- the exhaust introduction cam profile 42 formed on the exhaust cam 42 serves as an exhaust introduction mechanism for introducing exhaust gas into the cylinder during the intake stroke. Function.
- the lift amount of the exhaust valve 40 by the exhaust introduction cam profile 422 may be about l to 3 mm.
- the exhaust cam constituting the exhaust valve operating mechanism 41 is provided.
- the exhaust introduction mechanism 50 in the embodiment shown in FIG. 4 includes an exhaust introduction valve 51 for opening the exhaust passage in the same cylinder to the cylinder during the intake stroke, and an exhaust introduction valve 50 for the exhaust cylinder. It consists of an electromagnetic solenoid 52 that operates. Exhaust introduction mechanism configured as above
- the embodiment shown in FIG. 1 includes an exhaust gas temperature range detecting means for detecting an exhaust gas temperature range of a diesel engine.
- the exhaust temperature range detection means is described below.
- the exhaust temperature of the engine is largely determined mainly by the fuel injection amount (load) supplied to the engine and the engine speed.
- the control means 10 of the exhaust gas purifying apparatus in the illustrated embodiment has an exhaust temperature range map in which an engine speed and an engine load are parameters in an internal memory (not shown) as shown in FIG. From the engine speed and the amount of fuel destruction (load), it detects where the current exhaust gas temperature is. The region shown here indicates a temperature region of the temperature of the exhaust gas discharged from the cylinder.
- the boundaries of X and YZ shown in FIG. 5 are mainly set by referring to the test results regarding the exhaust gas temperature of the engine when defining the map and the active temperature region of the oxidation catalyst 12.
- the X region is a region higher than the activation temperature region of the oxidation catalyst 12
- the Y region is a region included in the activation temperature region of the oxidation catalyst 12
- the Z region is the activation temperature region of the oxidation catalyst 12.
- the area is lower than the area.
- this boundary line can be appropriately changed by the user depending on the operating characteristics of the diesel engine used and the characteristics of the catalyst used.
- the above-mentioned temperature regions do not necessarily have to be three, and may be further subdivided, or two regions can be defined.
- the control means 10 reads the engine speed signal (N e) and the accelerator opening signal (ACL) from the engine speed sensor 15 and the accelerator sensor 16 (step S 1), and reads a fuel injection amount map (not shown). The fuel injection amount is determined with reference to (Step S2).
- the control means 10 detects the fuel injection amount at this time as a load Q of the engine.
- the control means 10 performs the operation shown in FIG. 5 based on the engine load and the engine rotation speed detected as described above.
- the current exhaust temperature range is detected from the exhaust temperature range map (step S3).
- the control means 10 controls the intake shutter 9 and the exhaust shutter 11 according to the control map shown in FIG. 6 based on the current exhaust temperature range. Control.
- the control means 10 opens the intake shutter 9 and the exhaust shutter 11 fully according to the control map of FIG. Step S5). Then, the control means 10 executes the exhaust gas temperature lowering control (step S6).
- the exhaust gas temperature lowering control may be performed, for example, by controlling the cooling of exhaust gas by cooling water, or may be performed by separately providing a means for increasing the amount of intake air by a mechanical supercharger (spar charger). Note that the exhaust gas temperature lowering control is not the main configuration of the present invention, and therefore the description is omitted.
- the maps shown in (a) of FIG. 7 and (b) of FIG. 7 both divide the Z region of the map used for the exhaust temperature region detection means shown in FIG. The opening operation is set stepwise. "20% opening" means 80% closed with respect to the fully open position, and "5% opening” means 95% closed.
- the exhaust valve 40 is opened during the intake stroke by the action of the exhaust introduction cam profile 42 of the exhaust cam 42 constituting the exhaust introduction mechanism shown in FIG. Exhaust gas is introduced inside.
- the exhaust gas introduction mechanism 50 shown in FIG. 4 the electromagnetic solenoid 52 is driven during the intake stroke, the exhaust gas introduction valve 51 is opened, and exhaust gas is introduced into the cylinder. Is done.
- the high-temperature exhaust gas in the exhaust passage flows back into the cylinder during the intake stroke, so that the exhaust temperature is raised as a result. .
- the exhaust temperature range is detected based on the engine rotation speed and the load.
- the exhaust temperature range may be detected by the exhaust temperature sensor 8 provided directly on the exhaust pipe 7 of the engine.
- the oxidation catalyst and the DPF are described separately for the continuous regeneration type DPF, but the continuous regeneration type DPF is constructed integrally with the DPF directly supporting the material to be the oxidation catalyst.
- the present invention is similarly applicable to a continuously regenerating DPF in which an X storage reduction catalyst is supported on a DPF, or another continuous regenerating DPF that uses a catalyst that functions effectively and has a limited temperature range. Needless to say. Industrial applicability
- the exhaust purification device for a diesel engine based on the present invention when the exhaust gas temperature becomes lower than the active temperature region of the catalyst, the intake air amount is reduced by operating the intake shutter and the intake stroke is reduced.
- the intake air amount is reduced by operating the intake shutter and the intake stroke is reduced.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Processes For Solid Components From Exhaust (AREA)
- Exhaust Gas After Treatment (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02730692A EP1389674A4 (en) | 2001-05-24 | 2002-05-23 | EXHAUST GAS CLEANING FOR A DIESEL ENGINE |
US10/333,634 US6823661B2 (en) | 2001-05-24 | 2002-05-23 | Diesel engine exhaust purifying device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001-155895 | 2001-05-24 | ||
JP2001155895A JP2002349239A (ja) | 2001-05-24 | 2001-05-24 | ディーゼルエンジンの排気浄化装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002095197A1 true WO2002095197A1 (fr) | 2002-11-28 |
Family
ID=18999998
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2002/004974 WO2002095197A1 (fr) | 2001-05-24 | 2002-05-23 | Dispositif d'echappement comportant des moyens pour purifier les gaz d'echappement d'un moteur diesel |
Country Status (4)
Country | Link |
---|---|
US (1) | US6823661B2 (ja) |
EP (1) | EP1389674A4 (ja) |
JP (1) | JP2002349239A (ja) |
WO (1) | WO2002095197A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103809048A (zh) * | 2012-11-06 | 2014-05-21 | 上海航天设备制造总厂 | 电动气活门测试仪 |
Families Citing this family (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004176663A (ja) * | 2002-11-28 | 2004-06-24 | Honda Motor Co Ltd | 内燃機関の排気浄化装置 |
DE10352498A1 (de) * | 2003-11-11 | 2005-06-09 | Daimlerchrysler Ag | Verfahren zum Betreiben einer Brennkraftmaschine |
JP3992016B2 (ja) * | 2004-05-17 | 2007-10-17 | トヨタ自動車株式会社 | 予混合圧縮自着火式内燃機関の制御装置 |
DE102004031502B4 (de) | 2004-06-30 | 2013-12-05 | Daimler Ag | Verfahren zum Betreiben einer Brennkraftmaschine |
US7461504B2 (en) * | 2004-12-21 | 2008-12-09 | Detroit Diesel Corporation | Method and system for controlling temperatures of exhaust gases emitted from internal combustion engine to facilitate regeneration of a particulate filter |
CN101091038B (zh) * | 2005-02-28 | 2011-09-14 | 洋马株式会社 | 排气气体净化装置和具有该排气气体净化装置的内燃机以及微粒过滤器再生方法 |
DE102005036440A1 (de) * | 2005-08-03 | 2007-02-08 | Robert Bosch Gmbh | Verfahren und Vorrichtung zum Betreiben einer Brennkraftmaschine |
DE102005036438A1 (de) * | 2005-08-03 | 2007-02-08 | Robert Bosch Gmbh | Verfahren und Vorrichtung zum Betreiben einer Brennkraftmaschine |
JP4573303B2 (ja) * | 2006-01-10 | 2010-11-04 | Udトラックス株式会社 | ポンピングロス低減装置及び低減方法 |
US8322129B2 (en) * | 2006-02-16 | 2012-12-04 | Cummins, Inc. | Method for controlling turbine outlet temperatures in a diesel engine |
FR2897654A1 (fr) * | 2006-02-20 | 2007-08-24 | Renault Sas | Procede et dispositif de regeneration du filtre a particules d'un moteur a combustion interne. |
JP4893553B2 (ja) * | 2007-09-25 | 2012-03-07 | トヨタ自動車株式会社 | 内燃機関の制御装置 |
US20090173062A1 (en) * | 2008-01-04 | 2009-07-09 | Caterpillar Inc. | Engine system having valve actuated filter regeneration |
US20100050874A1 (en) * | 2008-08-29 | 2010-03-04 | Walter Cullen Lucas | Exhaust after treatment system and method |
JP5464059B2 (ja) * | 2010-06-04 | 2014-04-09 | マツダ株式会社 | エンジンの制御方法及び制御装置 |
JP5986736B2 (ja) * | 2011-11-16 | 2016-09-06 | 三菱重工業株式会社 | 内燃機関の排気浄化システム |
JP5862292B2 (ja) * | 2011-12-28 | 2016-02-16 | マツダ株式会社 | ディーゼルエンジンの制御装置 |
JP6020690B2 (ja) * | 2015-02-17 | 2016-11-02 | トヨタ自動車株式会社 | 内燃機関の制御装置 |
CN104806365A (zh) * | 2015-03-31 | 2015-07-29 | 凯龙高科技股份有限公司 | Dpf柴油机颗粒过滤系统进气节流再生温度控制方法 |
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JPH03108812U (ja) * | 1990-02-22 | 1991-11-08 | ||
JPH0481513A (ja) * | 1990-07-25 | 1992-03-16 | Nissan Diesel Motor Co Ltd | ディーゼルエンジンの排気浄化装置 |
JPH06129231A (ja) * | 1992-10-20 | 1994-05-10 | Kanesaka Gijutsu Kenkyusho:Kk | パティキュレート.トラップ内のパティキュレートの処理方法 |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
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JP3677954B2 (ja) * | 1997-07-23 | 2005-08-03 | 日産自動車株式会社 | 内燃機関の制御装置 |
AT2410U1 (de) * | 1997-09-16 | 1998-10-27 | Avl List Gmbh | Verfahren zur regeneration eines partikelfilters |
JP3331935B2 (ja) * | 1997-12-04 | 2002-10-07 | トヨタ自動車株式会社 | 圧縮着火式内燃機関 |
DE19926138A1 (de) * | 1999-06-09 | 2000-12-14 | Volkswagen Ag | Verfahren und Vorrichtung zum Reinigen des Abgases einer Brennkraftmaschine, insbesondere einer Diesel-Brennkraftmaschine |
DE19948156A1 (de) * | 1999-10-07 | 2001-04-12 | Volkswagen Ag | Verfahren und Vorrichtung zum Reinigen des Abgases einer Brennkraftmaschine |
JP3562415B2 (ja) * | 1999-12-24 | 2004-09-08 | トヨタ自動車株式会社 | 可変動弁機構を有する内燃機関 |
US6519933B2 (en) * | 2000-03-21 | 2003-02-18 | Toyota Jidosha Kabushiki Kaisha | Internal combustion engine having variable valve control system and NOx catalyst |
US6439210B1 (en) * | 2000-07-12 | 2002-08-27 | Caterpillar Inc. | Exhaust gas reprocessing/recirculation with variable valve timing |
US6394051B1 (en) * | 2000-09-01 | 2002-05-28 | Ford Global Technologies, Inc. | Spark ignition engine with negative valve-overlap |
-
2001
- 2001-05-24 JP JP2001155895A patent/JP2002349239A/ja active Pending
-
2002
- 2002-05-23 WO PCT/JP2002/004974 patent/WO2002095197A1/ja active Application Filing
- 2002-05-23 EP EP02730692A patent/EP1389674A4/en not_active Withdrawn
- 2002-05-23 US US10/333,634 patent/US6823661B2/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03108812U (ja) * | 1990-02-22 | 1991-11-08 | ||
JPH0481513A (ja) * | 1990-07-25 | 1992-03-16 | Nissan Diesel Motor Co Ltd | ディーゼルエンジンの排気浄化装置 |
JPH06129231A (ja) * | 1992-10-20 | 1994-05-10 | Kanesaka Gijutsu Kenkyusho:Kk | パティキュレート.トラップ内のパティキュレートの処理方法 |
Non-Patent Citations (1)
Title |
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See also references of EP1389674A4 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103809048A (zh) * | 2012-11-06 | 2014-05-21 | 上海航天设备制造总厂 | 电动气活门测试仪 |
Also Published As
Publication number | Publication date |
---|---|
EP1389674A1 (en) | 2004-02-18 |
US20030172644A1 (en) | 2003-09-18 |
US6823661B2 (en) | 2004-11-30 |
JP2002349239A (ja) | 2002-12-04 |
EP1389674A4 (en) | 2011-04-27 |
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