US20090249771A1 - Exhaust Gas Purification System for a V Type 8-Cylinder Internal Combustion Engine - Google Patents

Exhaust Gas Purification System for a V Type 8-Cylinder Internal Combustion Engine Download PDF

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US20090249771A1
US20090249771A1 US12/227,708 US22770807A US2009249771A1 US 20090249771 A1 US20090249771 A1 US 20090249771A1 US 22770807 A US22770807 A US 22770807A US 2009249771 A1 US2009249771 A1 US 2009249771A1
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exhaust gas
fuel
exhaust
cylinder
period
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US12/227,708
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English (en)
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Yuji Kanto
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Toyota Motor Corp
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Toyota Motor Corp
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/011—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more purifying devices arranged in parallel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • 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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
    • F01N3/0842—Nitrogen oxides
    • 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
    • F01N3/105—General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
    • F01N3/106—Auxiliary oxidation catalysts
    • 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
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • 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
    • F01N13/10—Other arrangements or adaptations of exhaust conduits of exhaust manifolds
    • F01N13/107—More than one exhaust manifold or exhaust collector
    • 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
    • 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
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • F01N2610/146—Control thereof, e.g. control of injectors or injection valves
    • 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
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/08—Parameters used for exhaust control or diagnosing said parameters being related to the engine
    • 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
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • 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
    • F02B75/00—Other engines
    • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
    • F02B75/18—Multi-cylinder engines
    • F02B75/22—Multi-cylinder engines with cylinders in V, fan, or star arrangement
    • 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
    • F02D41/0275—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 NOx trap or adsorbent
    • 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
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/047—Taking into account fuel evaporation or wall wetting
    • 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
    • Y02T10/40—Engine management systems

Definitions

  • the present invention relates to an exhaust gas purification system for a V-type 8-cylinder internal combustion engine.
  • NOx storage reduction catalyst hereinafter referred to as a NOx catalyst
  • NOx catalyst deteriorates in performance as an amount of NOx occluded therein increases.
  • fuel is supplied to the NOx catalyst so that the NOx stored in the catalyst can be reduced and discharged (hereinafter referred to as “NOx reduction processing”).
  • SOx poisoning which deteriorates the performance of a NOx catalyst, is generated due to the SOx in an exhaust gas being stored into the NOx catalyst.
  • SOx poisoning recovery processing fuel might sometimes be supplied to the NOx catalyst.
  • Japanese patent application laid-open No. 2001-280125 proposes that a fuel addition valve is mounted in an exhaust port of a cylinder which is the nearest to an exhaust-collector ring in an exhaust manifold, and which is the farthest from an opening portion of an EGR tube, so that fuel is added in synchronization with the timing at which an exhaust valve of that cylinder is in an open state.
  • it is intended to supply fuel to the vicinity of an exhaust gas purification device while suppressing the fuel added from the fuel addition valve from being adhered to the exhaust manifold, and/or from flowing into the EGR tube.
  • Japanese patent application laid-open No. 2002-106332 proposes that in case where an amount of supply of a reducing agent to be used in one NOx reduction processing operation is calculated based on the load of an internal combustion engine, and the amount of the reducing agent thus calculated is to be added by dividing it in a plurality of times, a plurality of additions of the reducing agent are made to synchronize with the crank angle of the internal combustion engine, whereby they are performed at the time when an exhaust valve is opened. According to this, efficient additions of the reducing agent can be carried out while surely entraining the reducing agent in a stream of exhaust gas.
  • the object of the present invention is to provide a technique which, in an exhaust gas purification system for a V-type 8-cylinder internal combustion engine, is capable of suppressing the adhesion of fuel added from fuel addition valves to exhaust passages, and at the same time suppressing the fuel from slipping or passing through exhaust gas purification devices.
  • exhaust passages that are provided for individual banks, respectively, in the V-type 8-cylinder internal combustion engine and extend collectively from individual cylinders in the individual banks, respectively, so as to pass therein an exhaust gas from said internal combustion engine;
  • exhaust gas purification devices that are arranged on said exhaust passages, respectively, and are each constructed to include a catalyst having an oxidation function;
  • the exhaust gas purification system for a V-type 8-cylinder internal combustion engine is characterized in that timing of the addition of fuel at which fuel is added from said fuel addition valves is switched over into a period in which instantaneous exhaust gas flow rates in said exhaust passages are different from each other, in accordance with an engine operating condition.
  • the present invention is constructed such that the timing of the addition of fuel at which fuel is added from the fuel addition valves is switched over into a period in which instantaneous exhaust gas flow rates in said exhaust passages are different from each other, in accordance with an engine operating condition. For example, in case where the possibility of the fuel added from the fuel addition valves adhering to the exhaust passages is high due to the engine operating condition, the timing of the addition of fuel is switched over into a period in which the instantaneous exhaust gas flow rates are high. In addition, in case where the possibility of the fuel added from the fuel addition valves slipping through the exhaust gas purification devices is high due to the engine operating condition, the timing of the addition of fuel is switched over into a period in which the instantaneous exhaust gas flow rates are low.
  • the instantaneous exhaust gas flow rates in the exhaust passages mean the flow rates of the exhaust gases in the exhaust passages in an extremely small or limited period of time in which the flow rates are changed due to the changes in the opened/closed state of the exhaust valves of cylinders.
  • the instantaneous exhaust gas flow rates in the exhaust passages are flow rates that change in accordance with the time elapsed in the period of one cycle of the V-type 8-cylinder internal combustion engine.
  • timing of the addition of fuel be switched over into a period in which the instantaneous exhaust gas flow rates in said exhaust passages become smaller, in accordance with an increasing amount of accumulation of a flow rate of exhaust gas discharged in a predetermined cycle period.
  • the amount of accumulation of a flow rate of exhaust gas discharged in a predetermined cycle period is an accumulated amount of a total flow rate of exhaust gas in the predetermined cycle period such as, for example, a crank angle interval or range of 720 degrees in which one cycle of each of all the cylinders in the V-type 8-cylinder internal combustion engine is completed, and it changes in accordance with an engine rotational speed, etc.
  • the engine rotational speed is low, the amount of accumulation becomes small, and the possibility of the fuel added from the fuel addition valves adhering to the exhaust passages becomes high.
  • the amount of accumulation becomes large, and the possibility of the fuel added from the fuel addition valves slipping through the exhaust gas purification devices becomes high.
  • fuel is added from the fuel addition valves at the time when the instantaneous exhaust gas flow rates in the exhaust passages are smaller, in accordance with the increasing amount of accumulation of the flow rate of exhaust gas discharged in the predetermined cycle period, whereby it is possible to suppress the fuel added from the fuel addition valves from adhering to the exhaust passages, and at the same time, it is also possible to suppress the fuel from slipping through the exhaust gas purification devices.
  • timing of the addition of fuel be switched over into a period in which the instantaneous exhaust gas flow rates in said exhaust passages become smaller, in accordance with the higher temperature of the exhaust gas.
  • fuel is added from the fuel addition valves at the time when the instantaneous exhaust gas flow rates in the exhaust passages are smaller, in accordance with the higher temperature of the exhaust gas, whereby it is possible to suppress the fuel added from the fuel addition valves from adhering to the exhaust passages, and at the same time, it is also possible to suppress the fuel from slipping through the exhaust gas purification devices.
  • said V-type 8-cylinder internal combustion engine be a V-type 8-cylinder internal combustion engine in which combustion can be continuously performed in predetermined two cylinders of the same bank in a crank angle interval of 90 degrees, and in which no combustion can be performed in any of the cylinders of the same bank in a crank angle interval of 180 degrees, and it is preferable that in accordance with the operating condition, said timing of the addition of fuel be switched over into one of the following periods, i.e., a period in which exhaust valves in two cylinders of the same bank in case where combustion is performed continuously in the crank angle interval of 90 degrees are both in their open state, a latter half period in which an exhaust valve in a predetermined one cylinder in case where no combustion is performed in a crank angle interval of 90 degrees before and after combustion is performed in the predetermined one cylinder of the same bank is in its open state, a former half period in which an exhaust valve in a predetermined one cylinder in case where no combustion is performed in a crank angle interval of 90 degrees before and after combustion
  • said V-type 8-cylinder internal combustion engine be a V-type 8-cylinder internal combustion engine in which combustion can be continuously performed in predetermined two cylinders of the same bank in a crank angle interval of 90 degrees, and in which no combustion can be performed in any of the cylinders of the same bank in a crank angle interval of 180 degrees, and it is preferable that when said amount of accumulation is equal to or smaller than a first predetermined amount of accumulation, said timing of the addition of fuel be switched to a period in which exhaust valves in two cylinders of the same bank in case where combustion is continuously performed in a crank angle interval of 90 degrees are both in their open state, and that when said amount of accumulation is equal to or more than a second predetermined amount of accumulation which is more than said first predetermined amount of accumulation, said timing of the addition of fuel be switched to a period in which exhaust valves in all the cylinders of the same bank in case where no combustion is performed in any cylinder in a crank angle interval of 180 degrees are in their closed state, and that when said amount of accumulation is
  • the timing of the addition of fuel can be divided in accordance with the instantaneous exhaust gas flow rates in the exhaust passages, so that fuel is added from the fuel addition valves at the time when the instantaneous exhaust gas flow rates in the exhaust passages are smaller, in accordance with the increasing amount of accumulation of the flow rate of exhaust gas discharged in the predetermined cycle period. Therefore, it is possible to suppress the fuel added from the fuel addition valves from adhering to the exhaust passages, and at the same time, it is also possible to suppress the fuel from slipping through the exhaust gas purification devices.
  • said timing of the addition of fuel be switched to a latter half period in which the exhaust valve in said predetermined one cylinder is in its open state, and it is preferable that when said amount of accumulation is more than the third predetermined amount of accumulation which is between the first predetermined amount of accumulation and the second predetermined amount of accumulation, and is less than the second predetermined amount of accumulation, said timing of the addition of fuel be switched to a former half period in which the exhaust valve in said predetermined one cylinder is in its open state.
  • the timing of the addition of fuel can be divided more finely in accordance with the instantaneous exhaust gas flow rates in the exhaust passages, so that fuel can be added from the fuel addition valves at the time when the instantaneous exhaust gas flow rates in the exhaust passages are smaller, in accordance with the increasing amount of accumulation of the flow rate of exhaust gas discharged in the predetermined cycle period. Therefore, it is possible to suppress the fuel added from the fuel addition valves from adhering to the exhaust passages, and at the same time, it is also possible to suppress the fuel from slipping through the exhaust gas purification devices.
  • FIG. 1 is a view showing the schematic construction of an internal combustion engine with its exhaust system to which an exhaust gas purification system is applied.
  • FIG. 2 is a view showing a valve-opening pattern of exhaust valves in individual cylinders of the internal combustion engine.
  • FIG. 3 is a view showing the change in the instantaneous flow rate of an exhaust gas.
  • FIG. 4 is a view showing a map for deciding fuel addition timing according to a first embodiment of the present invention.
  • FIG. 5 is a view showing a map for deciding fuel addition timing according to a second embodiment of the present invention.
  • FIG. 6 is a view showing the change in the instantaneous flow rate of an exhaust gas.
  • FIG. 1 illustrates the schematic construction of an internal combustion engine with its exhaust system according to an embodiment of the present invention.
  • An internal combustion engine 1 illustrated in FIG. 1 is a V-type 8-cylinder four-cycle diesel engine.
  • the internal combustion engine 1 is constructed to be provided with two banks including a first bank 2 and a second bank 3 .
  • the first bank 2 is provided with 1st, 3rd, 5th, and 7th cylinders
  • the second bank 3 is provided with 2nd, 4th, 6th, and 8th cylinders.
  • a first exhaust manifold 5 connected to the individual cylinders 4 of the first bank 2 is connected to the first bank 2 .
  • a second exhaust manifold 6 connected to the individual cylinders 4 of the second bank 3 is connected to the second bank 3 .
  • the first and second exhaust manifolds 5 , 6 each have branch pipe portions connected to the individual cylinders 4 , respectively, and a collector ring portion that serves to collect or merge exhaust gases introduced from the branch pipe portions and flow them to a downstream side.
  • An exhaust pipe 7 is connected to a downstream side of the collector ring portion of the first exhaust manifold 5 .
  • an exhaust pipe 8 is connected to a downstream side of the collector ring portion of the second exhaust manifold 6 .
  • the exhaust pipes 7 , 8 are connected at their terminal ends to an unillustrated muffler.
  • the collector ring portions of the first and second exhaust manifolds 5 , 6 and the exhaust pipes 7 , 8 correspond to exhaust passages of the present invention.
  • an exhaust gas purification device 9 that purifies particulate matter and NOx in the exhaust gas therein.
  • an exhaust gas purification device 10 that purifies particulate matter and NOx in the exhaust gas therein.
  • the exhaust gas purification devices 9 , 10 each have a NOx storage reduction catalyst with an oxidation function carried or supported on a filter of a wall flow type composed of a porous substrate.
  • the exhaust gas purification devices 9 , 10 correspond to an exhaust gas purification device of the present invention.
  • the exhaust gas purification devices 9 , 10 are not limited to the above-mentioned construction, but may instead be constructed, for example, to have a filter with no NOx storage reduction catalyst carried thereon, and a NOx storage reduction catalyst that is arranged in series with and at an upstream side of the filter.
  • a fuel addition valve 11 for adding fuel into the exhaust pipe 7 is disposed on the exhaust pipe 7 at an upstream side of the exhaust gas purification device 9 .
  • a fuel addition valve 12 for adding fuel into the exhaust pipe 8 is disposed on the exhaust pipe 8 at an upstream side of the exhaust gas purification device 10 .
  • the fuel addition valves 11 , 12 serve to add fuel in a process for recovering the performance of the exhaust gas purification devices 9 , 10 such as NOx reduction processing, SOx poisoning recovery processing, PM regeneration processing, and the like of the exhaust gas purification devices 9 , 10 .
  • An electronic control unit (ECU) 13 for controlling the internal combustion engine 1 is provided in conjunction with the internal combustion engine 1 of the above construction.
  • the ECU 13 controls the operating state or the like of the internal combustion engine 1 in accordance with the operating condition of the internal combustion engine 1 and driver's requirements, and, in addition to this, also controls the process of recovering the performance of the exhaust gas purification devices 9 , 10 .
  • Sensors such as a crank position sensor 14 and the like related to controlling the operating state of the internal combustion engine 1 are connected to the ECU 13 through electric wiring, so that output signals from these sensors can be input to the ECU 13 .
  • unillustrated fuel injection valves and the like in the internal combustion engine 1 are also connected to the ECU 13 through electrical wiring, and in addition, the fuel addition valves 11 , 12 are connected to the ECU 13 through electrical wiring, so that these components or elements can be controlled by the ECU 13 .
  • the ECU 13 includes a CPU, a ROM, a RAM and the like.
  • the ROM stores programs for performing a variety of kinds of control on the internal combustion engine 1 , maps storing relevant data, ant so on. Routines for the SOx poisoning recovery processing and the PM regeneration processing in addition to a routine for the NOx reduction processing to reduce the NOx stored in the exhaust gas purification devices 9 , 10 are some of the programs stored in ROM of the ECU 13 .
  • the amount of accumulation an accumulated amount of the flow rate of the exhaust gas discharged in the period of one cycle of the internal combustion engine 1 (hereinafter referred to as the amount of accumulation) is not sufficient, the fuel added from the fuel addition valves 11 , 12 might not sometimes be entrained in the exhaust gas to be adhered to the exhaust pipes 7 , 8 .
  • the amount of accumulation is excessive, the fuel added from the fuel addition valves 11 , 12 might sometimes be entrained in the exhaust gas to an excessive extent, so it might slip or pass through the exhaust gas purification devices 9 , 10 .
  • the accumulated amount of the flow rate of the exhaust gas discharged in the period of one cycle of the internal combustion engine 1 is an accumulated amount of a total flow rate of the exhaust gas in an angular range of 720 degrees CA in which one cycle of each of all the cylinders in the V-type 8-cylinder diesel engine is completed, and it changes in accordance with the rotational speed of the engine, etc.
  • the amount of accumulation decreases when the engine rotational speed is low, whereas the amount of accumulation increases when the engine rotational speed is high.
  • the order of combustion of the cylinders in each bank is set, from the point of view of vibration prevention or the like, in such a manner that combustion does not occur at the same time in both banks. Therefore, the combustion of the cylinders in one bank occurs at unequal intervals.
  • FIG. 2 there is exemplified a valve-opening pattern of exhaust valves in the individual cylinders in the respective banks of a V-type 8-cylinder diesel engine such as the internal combustion engine 1 .
  • the axis of abscissa represents the crank angle, and an exhaust valve of a cylinder indicated in each grid is opened at a crank angle at the left end of that grid.
  • the width of each grid is 90 degrees CA, and this does not mean that the valve opening period of the exhaust valve of each cylinder is 90 degrees CA, but only indicates the valve-opening start time of the exhaust valve of each cylinder.
  • the valve opening period of each exhaust valve is such that the exhaust valve of a cylinder shown in a grid is opened at a crank angle at the left end of that grid, and the exhaust valve of that cylinder is closed at a point within the following third grid.
  • the valve opening period of the exhaust valve is 180 degrees CA or more.
  • combustion in the first bank 2 is performed in order of 1st, 7th, 3rd, and 5th cylinders
  • combustion in the second bank 3 is performed in order of 2nd, 4th, 6th, and 8th cylinders. Therefore, the order of the exhaust strokes is similar to the order of the combustion strokes.
  • valve-opening pattern of the exhaust valves is as shown in FIG. 2 , so in this embodiment, the instantaneous flow rates of the exhaust gases in the exhaust pipes 7 , 8 in the period of one cycle of the internal combustion engine 1 (hereinafter referred to as instantaneous exhaust gas flow rates) change.
  • the instantaneous exhaust gas flow rates mean the flow rates of the exhaust gases in the exhaust pipes 7 , 8 in an extremely small or limited period of time in which the flow rates are changed due to the changes in the opened/closed state of the exhaust valves of the cylinders.
  • the instantaneous exhaust gas flow rates in the exhaust pipes 7 , 8 are flow rates that change in accordance with the time elapsed in the period of one cycle of the V-type 8-cylinder diesel engine.
  • FIG. 3( a ) shows the change in the instantaneous exhaust gas flow rate in the exhaust pipe 7
  • FIG. 3( b ) shows the change in the instantaneous exhaust gas flow rate in the exhaust pipe 8 .
  • FIG. 3( a ) shows the change in the instantaneous exhaust gas flow rate in the exhaust pipe 7
  • FIG. 3( b ) shows the change in the instantaneous exhaust gas flow rate in the exhaust pipe 8 .
  • the instantaneous exhaust gas flow rates shown by solid lines represent the instantaneous exhaust gas flow rates of the individual cylinders
  • the instantaneous exhaust gas flow rates shown by broken lines represent total instantaneous exhaust gas flow rates in a period of time in which the exhaust valves of two cylinders of the same bank are in their open state (i.e., overlapped state).
  • combustion in the other cylinders is not performed at an interval of 90 degrees CA or more.
  • the instantaneous flow rate of the exhaust gas discharged from that one cylinder becomes the instantaneous exhaust gas flow rate in the exhaust pipe 7 or 8 .
  • the instantaneous flow rate of the exhaust gas discharged from the one cylinder differs between in a former or first half period in which the exhaust valve of the one cylinder is in its open state, and in a latter or second half period in which the exhaust valve of the one cylinder is in its open state. That is, as shown in FIG. 3 , the instantaneous exhaust gas flow rate in the latter half period (period B) in which the exhaust valve is in its open state is larger than that in the former half period (period C) in which the exhaust valve is in its open state.
  • the instantaneous exhaust gas flow rates being the second largest in the exhaust pipes 7 , 8 , are formed in the latter half period (period B) in which the exhaust valve in one cylinder is in its open state.
  • the instantaneous exhaust gas flow rates being the third largest in the exhaust pipes 7 , 8 are formed in the former half period (period C) in which the exhaust valve in one cylinder is in its open state.
  • the instantaneous exhaust gas flow rates in the exhaust pipes 7 , 8 change during the period of one cycle of the internal combustion engine 1 . Therefore, in this embodiment, in view of the above-mentioned change in the instantaneous exhaust gas flow rates, in order to suppress the fuel added from the fuel addition valves 11 , 12 from adhering to the exhaust pipes 7 , 8 as well as suppress the fuel from slipping or passing through the exhaust gas purification devices 9 , 10 , the timing of the addition of fuel is switched over in accordance with the above-mentioned amount of accumulation, so that the instantaneous exhaust gas flow rates in the exhaust pipes 7 , 8 are different.
  • the amount of accumulation is made a parameter of the engine operating condition for switching over the timing of the addition of fuel.
  • the timing of the addition of fuel is switched into one of the above-mentioned four periods (period A through period D) so that the addition of fuel can be performed at a time at which the instantaneous exhaust gas flow rates become optimal for the amount of accumulation.
  • FIG. 4 is a map in which the amount of accumulation is represented on the axis of abscissa.
  • the amount of accumulation becomes the smallest.
  • the addition of fuel is carried out at the time when the exhaust valves in two cylinders for which the instantaneous exhaust gas flow rates in the exhaust pipes 7 , 8 in the period A are the largest are both in their open state.
  • the amount of accumulation becomes the second smallest.
  • the addition of fuel is carried out in the latter half period in which the exhaust valve in one cylinder for which the instantaneous exhaust gas flow rates in the exhaust pipes 7 , 8 in the period B are the second largest is in its open state.
  • the amount of accumulation becomes the third smallest.
  • the addition of fuel is carried out in the former half period in which the exhaust valve in one cylinder for which the instantaneous exhaust gas flow rates in the exhaust pipes 7 , 8 in the period C are the third largest is in its open state.
  • the amount of accumulation becomes the largest.
  • the addition of fuel is carried out at the time when the exhaust valves in all the cylinders of one of the banks for which the instantaneous exhaust gas flow rates in the exhaust pipes 7 , 8 in the period D are the smallest are in their closed state.
  • the amount of accumulation at a boundary that divides the timing of the addition of fuel into the period A and the period B is a first predetermined amount of accumulation of the present invention
  • the amount of accumulation at a boundary that divides the timing of the addition of fuel into the period C and the period D is a second predetermined amount of accumulation of the present invention
  • the amount of accumulation at a boundary that divides the timing of the addition of fuel into the period B and the period C is a third predetermined amount of accumulation of the present invention.
  • the timing of the addition of fuel has been switched over into a period in which the instantaneous exhaust gas flow rates are different from each other, in accordance with this amount of accumulation.
  • the timing of the addition of fuel is switched over into a period in which the instantaneous exhaust gas flow rates are different from each other, in accordance with this exhaust gas temperature, too.
  • the timing of the addition of fuel is switched into a period in which the instantaneous exhaust gas flow rates are different, in accordance with the amount of accumulation and the exhaust gas temperature.
  • the timing of the addition of fuel is switched into one of the above-mentioned four periods (period A through period D) so that the addition of fuel can be performed at a time at which the instantaneous exhaust gas flow rates become optimal for the amount of accumulation and the temperature of the exhaust gas.
  • FIG. 5 is a map in which the amount of accumulation is represented on the axis of abscissa, and the temperature of the exhaust gas is represented by the axis of ordinate.
  • the amount of accumulation becomes the smallest, and at the same time, when the engine load is equal to or less than a medium load, the temperature of the exhaust gas becomes low.
  • the addition of fuel is carried out at the time when the exhaust valves in two cylinders for which the instantaneous exhaust gas flow rates in the exhaust pipes 7 , 8 in the period A are the largest are both in their open state.
  • the amount of accumulation becomes the smallest, and at the same time, when the engine load is equal to or higher than the medium load, the temperature of the exhaust gas becomes high.
  • the addition of fuel is carried out in the latter half period in which the exhaust valve in one cylinder for which the instantaneous exhaust gas flow rates in the exhaust pipes 7 , 8 in the period B are the second largest is in its open state.
  • the amount of accumulation becomes the second smallest, and at the same time, when the engine load is in a low load range, the temperature of the exhaust gas becomes low.
  • the addition of fuel is carried out at the time when the exhaust valves in two cylinders for which the instantaneous exhaust gas flow rates in the exhaust pipes 7 , 8 in the period A are the largest are both in their open state.
  • the amount of accumulation becomes the second smallest, and at the same time, when the engine load is in a medium-high load range, the temperature of the exhaust gas becomes high.
  • the addition of fuel is carried out in the latter half period in which the exhaust valve in one cylinder for which the instantaneous exhaust gas flow rates in the exhaust pipes 7 , 8 in the period B are the second largest is in its open state.
  • the amount of accumulation becomes the third smallest, and at the same time, when the engine load is in the low load range, the temperature of the exhaust gas becomes low.
  • the addition of fuel is carried out in the latter half period in which the exhaust valve in one cylinder for which the instantaneous exhaust gas flow rates in the exhaust pipes 7 , 8 in the period B are the second largest is in its open state.
  • the amount of accumulation becomes the third smallest, and at the same time, when the engine load is in the medium-high load range, the temperature of the exhaust gas becomes high.
  • the addition of fuel is carried out in the former half period in which the exhaust valve in one cylinder for which the instantaneous exhaust gas flow rates in the exhaust pipes 7 , 8 in the period C are the third largest is in its open state.
  • the amount of accumulation becomes the largest, and at the same time, when the engine load is in the low load range, the temperature of the exhaust gas becomes low.
  • the addition of fuel is carried out in the former half period in which the exhaust valve in one cylinder for which the instantaneous exhaust gas flow rates in the exhaust pipes 7 , 8 in the period C are the third largest is in its open state.
  • the amount of accumulation becomes the largest, and at the same time, when the engine load is in the medium-high load range, the temperature of the exhaust gas becomes high.
  • the addition of fuel is carried out at the time when the exhaust valves in all the cylinders of one of the banks for which the instantaneous exhaust gas flow rates in the exhaust pipes 7 , 8 in the period D are the smallest are in their closed state.
  • an upper limit and a lower limit for the instantaneous exhaust gas flow rates at the time of the addition of fuel may further be set.
  • the timing of the addition of fuel is switched over in only a period A 1 within the period A, in only a period B 1 within the period B, in only a period C 1 within the period C, and in the period D, as shown in FIG. 6 .
  • the order or sequence of the instantaneous exhaust gas flow rates in each of the periods (A 1 , B 1 , C 1 , D) is made clear, so it is possible to suppress the fuel added from the fuel addition valves 11 , 12 from adhering to the exhaust pipes 7 , 8 in a more suitable manner, and at the same time, it is also possible to suppress the fuel from slipping through the exhaust gas purification devices 9 , 10 in a more suitable manner.
  • an exhaust gas purification system for a V-type 8-cylinder internal combustion engine it is possible to suppress the adhesion of fuel added from a fuel addition valve to an exhaust passages, and at the same time suppress the fuel from slipping or passing through an exhaust gas purification device.
  • Japanese patent application laid-open No. 2001-280125 discloses that a fuel addition valve is mounted in an exhaust port of a cylinder which is the nearest to an exhaust-collector ring in an exhaust manifold, and which is the farthest from an opening portion of an EGR tube, so that fuel is added in synchronization with the timing at which an exhaust valve of that cylinder is in an open state.
  • Japanese patent application laid-open No. 2002-106332 discloses that in case where an amount of supply of a reducing agent to be used in one NOx reduction processing operation is calculated based on the load of an internal combustion engine, and the amount of the reducing agent thus calculated is to be added by dividing it in a plurality of times, a plurality of additions of the reducing agent are made to synchronize with the crank angle of the internal combustion engine, whereby they are performed at the time when an exhaust valve is opened.

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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)
  • Materials Engineering (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
US12/227,708 2006-05-25 2007-05-24 Exhaust Gas Purification System for a V Type 8-Cylinder Internal Combustion Engine Abandoned US20090249771A1 (en)

Applications Claiming Priority (3)

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JP2006-145308 2006-05-25
JP2006145308A JP2007315277A (ja) 2006-05-25 2006-05-25 Ｖ型８気筒内燃機関の排気浄化システム
PCT/JP2007/061037 WO2007139170A1 (ja) 2006-05-25 2007-05-24 Ｖ型８気筒内燃機関の排気浄化システム

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JP5304402B2 (ja) * 2009-04-08 2013-10-02 トヨタ自動車株式会社 内燃機関の制御装置
SE534475C2 (sv) * 2010-01-18 2011-09-06 Scania Cv Ab Förfarande och anordning för att förhindra bränsleansamling i ett avgassystem hos ett motorfordon

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US20050028515A1 (en) * 2003-07-16 2005-02-10 Toyota Jidosha Kabushiki Kaisha Exhaust control apparatus of internal combustion engine and exhaust gas flow amount estimating method
US20050252200A1 (en) * 2004-05-12 2005-11-17 Mitsubishi Denki Kabushiki Kaisha Fuel injection control device of internal combustion engine
US20050274106A1 (en) * 2004-06-14 2005-12-15 Toyota Jidosha Kabushiki Kaisha Exhaust gas control apparatus and exhaust gas control method for internal combustion engine
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JP3508691B2 (ja) 2000-03-31 2004-03-22 トヨタ自動車株式会社 内燃機関の排気浄化装置
JP3508744B2 (ja) 2000-07-24 2004-03-22 トヨタ自動車株式会社 内燃機関の排気浄化装置
JP3912167B2 (ja) * 2002-04-16 2007-05-09 トヨタ自動車株式会社 排気ガス浄化装置及び排気ガス浄化方法
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US20050252200A1 (en) * 2004-05-12 2005-11-17 Mitsubishi Denki Kabushiki Kaisha Fuel injection control device of internal combustion engine
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KR20090027665A (ko) 2009-03-17
JP2007315277A (ja) 2007-12-06
EP2031203A4 (en) 2010-02-03
EP2031203A1 (en) 2009-03-04
WO2007139170A1 (ja) 2007-12-06

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