US20130305707A1 - Control apparatus for supercharger-equipped internal combustion engine - Google Patents

Control apparatus for supercharger-equipped internal combustion engine Download PDF

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Publication number
US20130305707A1
US20130305707A1 US13/881,084 US201113881084A US2013305707A1 US 20130305707 A1 US20130305707 A1 US 20130305707A1 US 201113881084 A US201113881084 A US 201113881084A US 2013305707 A1 US2013305707 A1 US 2013305707A1
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Prior art keywords
blow
amount
exhaust
valve
determination value
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Abandoned
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US13/881,084
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English (en)
Inventor
Noboru Takagi
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Toyota Motor Corp
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Toyota Motor Corp
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Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA reassignment TOYOTA JIDOSHA KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TAKAGI, NOBORU
Publication of US20130305707A1 publication Critical patent/US20130305707A1/en
Abandoned legal-status Critical Current

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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
    • F02B37/183—Arrangements of bypass valves or actuators therefor
    • 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
    • F02B25/00—Engines characterised by using fresh charge for scavenging cylinders
    • F02B25/14—Engines characterised by using fresh charge for scavenging cylinders using reverse-flow scavenging, e.g. with both outlet and inlet ports arranged near bottom of piston stroke
    • F02B25/145—Engines characterised by using fresh charge for scavenging cylinders using reverse-flow scavenging, e.g. with both outlet and inlet ports arranged near bottom of piston stroke with intake and exhaust valves exclusively in the cylinder head
    • 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
    • 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
    • F02D13/0203—Variable control of intake and exhaust valves
    • F02D13/0215—Variable control of intake and exhaust valves changing the valve timing only
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D23/00—Controlling engines characterised by their being supercharged
    • 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
    • F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
    • 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
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/0047—Controlling exhaust gas recirculation [EGR]
    • F02D41/0065—Specific aspects of external EGR control
    • 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
    • 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
    • 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
    • F02D41/18—Circuit arrangements for generating control signals by measuring intake air flow
    • 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 a control apparatus for a supercharged internal combustion engine, and more particular to a control apparatus for a supercharged internal combustion engine that is suitable for controlling the internal combustion engine that includes a variable valve operating mechanism capable of changing a valve overlap period and a waste gate valve.
  • Patent Document 1 discloses a control apparatus for an internal combustion engine.
  • This conventional control apparatus estimates a blow-through amount of fresh air that blows through a combustion chamber from an intake passage to an exhaust passage, on the basis of the concentration of oxygen in the exhaust passage detected by an air fuel ratio sensor. On that basis, a valve overlap period is controlled in accordance with this amount of blow-through of the fresh air.
  • Patent Document 1 Japanese Laid-open Patent Application Publication No. 2007-263083
  • Patent Document 2 Japanese Laid-open Patent Application Publication No. 2008-175201
  • Patent Document 3 Japanese Laid-open Patent Application Publication No. 2010-163915
  • Patent Document 4 Japanese Laid-open Patent Application Publication No. 2008-297930
  • blow-through amount of fresh air that blows through the combustion chamber from the intake passage to the exhaust passage becomes too large, there is a concern that a catalyst disposed in the exhaust passage may be overheated.
  • the blow-through amount of the fresh air is large, shortening the valve overlap period allows the blow-through amount to be reduced.
  • an operating region is present in which reducing the blow-through amount to a desirable amount is difficult only by adjusting the valve overlap period. In such an operating region, it is not possible to adequately reduce the blow-through amount only by shortening the valve overlap period, and as a result, there is a concern that the overheat of the catalyst may be produced.
  • the present invention has been made to solve the problem as described above, and has its object to provide a control apparatus for a supercharged internal combustion engine, which can favorably achieve a good balance between prevention of overheat of a catalyst disposed an exhaust passage and suppression of turbo lag, in a case in which a blow-through of fresh air that blows through a combustion chamber from an intake passage to an exhaust passage is generated.
  • a first aspect of the present invention is a control apparatus for a supercharged internal combustion engine, comprising:
  • a turbo supercharger which includes, in an exhaust passage, a turbine that is operated by exhaust energy
  • a waste gate valve which is capable of switching an opening and closing of the exhaust bypass passage
  • variable valve operating mechanism which is capable of changing a valve overlap period during which an opening period of an exhaust valve overlaps with an opening period of an intake valve
  • blow-through amount obtaining means for obtaining a blow-through amount of fresh air that blows through a combustion chamber from an intake passage to the exhaust passage;
  • overlap period shortening means for shortening the valve overlap period so that the blow-through amount becomes equal to or smaller than a predetermined blow-through determination value when the blow-through amount is larger than the blow-through determination value;
  • blow-through amount determination means for determining whether or not the blow-through amount is still larger than the blow-through determination value after the valve overlap period has been shortened by the overlap period shortening means
  • WGV control means for opening the waste gate valve when the blow-through amount is determined by the blow-through amount determination means to be still larger than the blow-through determination value.
  • a second aspect of the present invention is the control apparatus for a supercharged internal combustion engine according to the first aspect of the present invention, further comprising an air fuel ratio sensor which is disposed in the exhaust passage to detect an air fuel ratio of exhaust gas,
  • blow-through amount obtaining means is means for obtaining the blow-through amount based on an output value of the air fuel ratio sensor.
  • the present invention when the blow-through amount of fresh air is larger than the blow-through determination value, it becomes possible to decrease the blow-through amount to the blow-through determination value or less, while suppressing the control amount of the opening degree of the waste gate valve to the minimum necessary. Therefore, the present invention can favorably achieve a good balance between prevention of overheat of a catalyst disposed an exhaust passage by controlling the blow-through amount and suppression of turbo lag, in a case in which the blow-through amount is larger than the blow-through amount.
  • the second aspect of the present invention can favorably achieve a good balance between the prevention of overheat of the catalyst by controlling the blow-through amount and the suppression of turbo lag, by use of the configuration by which the aforementioned blow-through amount is obtained on the basis of the output value of the air fuel ratio sensor.
  • FIG. 1 is a schematic diagram for illustrating a system configuration of an internal combustion engine according to a first embodiment of the present invention
  • FIG. 2 is a diagram for explaining a blow-through of fresh air that blows through a combustion chamber from an intake passage to an exhaust passage;
  • FIG. 3 is a flowchart of a routine that is executed in the first embodiment of the present invention.
  • FIG. 1 is a schematic diagram for illustrating a system configuration of an internal combustion engine 10 according to a first embodiment of the present invention.
  • the system of the present embodiment includes, as one example, a spark ignition type internal combustion engine (gasoline engine) 10 .
  • a combustion chamber 12 is formed in each cylinder of the internal combustion engine 10 .
  • An intake passage 14 and an exhaust passage 16 are in communication with the combustion chamber 12 .
  • An air cleaner 18 is disposed at a position near an inlet of the intake passage 14 .
  • An air flow meter 20 is disposed near a downstream position of the air cleaner 18 to output a signal according to a flow rate of air drawn into the intake passage 14 .
  • a compressor 22 a of a turbo supercharger 22 is disposed downstream of the air flow meter 20 .
  • the compressor 22 a is integrally connected, via a turbine shaft 22 c, to a turbine 22 b disposed at the exhaust passage 16 .
  • each cylinder of the internal combustion engine 10 includes a fuel injection valve 30 for injecting fuel into an intake port, and an ignition plug 32 for igniting a mixture gas.
  • an air fuel ratio sensor 34 for detecting an air fuel ratio (oxygen concentration) of exhaust gas is disposed on the upstream side of the turbine 22 c in the exhaust passage 16 .
  • an exhaust bypass passage 36 which is configured to branch off the exhaust passage 16 at an upstream side portion of the turbine 22 b and merge with the exhaust passage 16 at a downstream side portion of the turbine 22 .
  • a waste gate valve (WGV) 38 is provided for opening and closing the exhaust bypass passage 36 .
  • the WGV 38 is herein assumed to be configured to be able to be adjusted to an arbitrary opening degree by means of a pressure-regulated or electrically-operated type actuator (not shown).
  • a catalyst 40 for purifying the exhaust gas is disposed in the exhaust passage 16 on the further downstream side of its portion that is connected with the exhaust bypass passage 36 on the downstream side of the turbine 22 b.
  • An intake valve 42 and an exhaust valve 44 are provided at the intake port and an exhaust port, respectively.
  • the intake valve 42 establishes continuity or discontinuity between the combustion chamber 12 and the intake passage 14
  • the exhaust valve 44 establishes continuity or discontinuity between the combustion chamber 12 and the exhaust passage 16 .
  • the intake valve 42 and the exhaust valve 44 are driven by an intake variable valve operating mechanism 46 and an exhaust variable valve operating mechanism 48 , respectively.
  • a variable valve timing (VVT) mechanism is used that continuously makes the opening and closing timing of the intake valve 42 variable by changing a rotation phase of an intake camshaft with respect to a rotation phase of a crankshaft
  • the exhaust variable valve operating mechanism 48 also is a mechanism that has the same configuration as that.
  • an intake cam angle sensor 50 and an exhaust cam angle sensor 52 are disposed for detecting rotational angles of the camshafts, that is, an intake cam angle and an exhaust cam angle, respectively.
  • the system shown in FIG. 1 includes an ECU (Electronic Control Unit) 54 .
  • An input section of the ECU 54 is connected with various types of sensors for detecting the operating state of the internal combustion engine 10 , such as a crank angle sensor 56 for detecting an engine speed, as well as the air flow meter 20 , the intake pressure sensor 28 and the air fuel ratio sensor 34 that are described above.
  • an output section of the ECU 54 is connected with various types of actuators for controlling the operating state of the internal combustion engine 10 , such as the throttle valve 26 , the fuel injection valve 30 , the ignition plug 32 , the WGV 38 and the variable valve operating mechanisms 46 and 48 that are described above.
  • the ECU 54 can control the operating state of the internal combustion engine 10 by actuating each actuator according to the output of the aforementioned each sensor and predetermined programs.
  • FIG. 2 is a diagram for explaining a blow-through of fresh air that blows through the combustion chamber 12 from the intake passage 14 to the exhaust passage 16 .
  • a valve overlap period during which the opening period of the exhaust valve 44 and the opening period of the intake valve 42 are overlapped with each other (hereinafter, simply referred to as the “valve overlap period”) can be changed by adjusting at least one of the advance amount of the opening and closing timing of the intake valve 42 and the retard amount of the opening and closing timing of the exhaust valve 44 .
  • a fresh air blow-through amount Gsca is calculated by use of the output value of the air fuel ratio sensor 34 during operation of the internal combustion engine 10 , and further, when the blow-through amount Gsca calculated is larger than a predetermined blow-through determination value Gjudge, the valve overlap period is shortened so that the blow-through amount Gsca becomes smaller than or equal to the blow-through determination value Gjudge. On that basis, if the blow-through amount Gsca has not yet become smaller than or equal to the blow-through determination value Gjudge in spite of the shortening of the valve overlap period, the WGV 38 is opened.
  • FIG. 3 is a flowchart showing a control routine executed by the ECU 54 to implement the control according to the first embodiment of the present invention.
  • step 100 it is determined whether or not a blow-through occurrence condition of fresh air is established.
  • the ECU 54 stores a map (not shown) that defines an operating region in which the blow-through occurrence condition under which the blow-through of fresh air is generated during setting of the valve overlap period is established, through the use of the operating region (region based on a load factor and an engine speed) of the internal combustion engine 10 .
  • step 100 it is determined with reference to such a map whether or not the current operating region is an operating region in which the blow-through occurrence condition is established.
  • determination as to whether or not the blow-through occurrence condition is established is not limited to the one using the aforementioned method, and if, for example, an exhaust pressure sensor for detecting the exhaust pressure P2 is included in addition to the intake pressure sensor 28 for detecting the intake pressure P1, may be the one performed by comparing values of those sensors.
  • the fresh air blow-through amount Gsca is calculated on the basis of the output value of the air fuel ratio sensor 34 (step 102 ).
  • the blow-through amount Gsca is calculated in accordance with the following expression.
  • Gsca Sabyf/Iabyf ⁇ Ga
  • Sabyf denotes an air fuel ratio of exhaust gas obtained by use of the air fuel ratio sensor 34
  • Iabyf denotes a target air fuel ratio calculated on the basis of the intake air amount and the fuel injection amount
  • Ga denotes an intake air amount obtained by use of the air flow meter 20 .
  • step 104 it is determined whether or not the valve overlap period has been shortened. Specifically, in present step 104 , it is determined whether or not there is a situation in which the valve overlap period has been shortened to a predetermined value or less by means of the processing of step 108 described later, during establishment of the aforementioned blow-through occurrence condition.
  • step 106 it is determined whether or not the fresh air blow-through amount Gsca is larger than a predetermined determination value Gjudge (step 106 ).
  • the determination value Gjudge in present step 106 is a value that is set in advance as a threshold value for judging whether or not the current blow-through amount Gsca is an amount by which the overheat of the catalyst 40 may be produced.
  • the valve overlap period is shortened by means of the variable valve operating mechanisms 46 and 48 so as to be shorter than or equal to a predetermined value (step 108 ).
  • the valve overlap period is determined in aforementioned step 104 to have been shortened, it is then determined whether or not the current blow-through amount Gsca is larger than the determination value Gjudge by the processing similar to that of aforementioned step 106 (step 110 ).
  • the current blow-through amount Gsca is determined in present step 110 to be larger than the determination value Gjudge, that is to say, it can be judged that the blow-through amount Gsca has not yet become smaller than or equal to the blow-through determination value Gjudge in spite of the shortening of the valve overlap period, the WGV 38 is opened to an opening degree necessary to decrease the boost pressure to a predetermined pressure or lower (step 112 ).
  • the processing of present step 112 can be performed as follows. More specifically, for example, a feedback control of the WGV opening degree is performed so as to achieve the value of the boost pressure (obtained by a map or the like) necessary for the blow-through amount Gsca to be smaller than or equal to the blow-through determination value Gjudge, on the basis of the intake pressure P 1 detected by the intake pressure sensor 28 .
  • the WGV 38 is opened in order to decrease the boost pressure.
  • a control to reduce the blow-through amount Gsca is performed in the order from the shortening of the valve overlap period to the adjustment of the WGV 38 . More specifically, opening the WGV 38 for the purpose of reducing the blow-through amount is prohibited until it is judged that shortening the valve overlap period does not allow the blow-through amount Gsca to be smaller than or equal to the blow-through determination value Gjudge.
  • the control amount of the opening degree of the WGV 38 that is necessary for the blow-through amount Gsca to be smaller than or equal to the blow-through determination value Gjudge becomes large.
  • turbo lag becomes large due to a decrease in the flow rate of exhaust gas passing through the turbine 22 b.
  • the blow-through amount Gsca is required to be suppressed by the WGV 38 , it becomes possible to suppress the control amount of the opening degree of the WGV 38 to the minimum necessary.
  • the system according to the present embodiment can favorably achieve a good balance between prevention of overheat of the catalyst 40 by suppressing the blow-through amount Gsca and suppression of turbo lag, while obtaining the scavenging effect, in a case in which the blow-through amount Gsca is larger than the blow-through determination value Gjudge.
  • the blow-through amount of fresh air is calculated by use of the output value of the air fuel ratio sensor 34 .
  • the blow-through amount obtaining means of the present invention is not limited to the one using the aforementioned method.
  • the valve overlap period is changed by means of the intake variable valve operating mechanism 46 that is capable of changing the opening and closing timing of the intake valve 42 and the exhaust variable valve operating mechanism 48 that is capable of changing the opening and closing timing of the exhaust valve 44 .
  • the variable valve operating mechanism of the present invention is not limited to the one having the aforementioned configuration. More specifically, a configuration may be adopted that adjusts the valve overlap period by regulating at least one of the closing timing of the exhaust valve and the opening timing of the intake valve.
  • the ECU 54 executes the aforementioned processing of step 102 , whereby the “blow-through amount obtaining means” according to the first aspect of the present invention is realized, the ECU 54 executes the aforementioned processing of step 108 when the aforementioned determination of step 106 is positive, whereby the “overlap period shortening means” according to the first aspect of the present invention is realized, the ECU 54 executes the aforementioned processing of step 110 when the aforementioned determination of step 104 is positive, whereby the “blow-through amount determination means” according to the first aspect of the present invention is realized, and the ECU 54 executes the aforementioned processing of step 112 when the aforementioned determination of step 110 is positive, whereby the “WGV control means” according to the first aspect of the present invention is realized.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
US13/881,084 2011-01-24 2011-01-24 Control apparatus for supercharger-equipped internal combustion engine Abandoned US20130305707A1 (en)

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EP (1) EP2669497B1 (zh)
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US9567886B2 (en) * 2014-12-02 2017-02-14 MAGNETI MARELLI S.p.A. Method to control the temperature of the exhaust gases of a supercharged internal combustion engine
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JP7067003B2 (ja) * 2017-09-25 2022-05-16 三菱自動車工業株式会社 エンジンの制御装置
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