WO2012056527A1 - 車載内燃機関の制御装置 - Google Patents
車載内燃機関の制御装置 Download PDFInfo
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- WO2012056527A1 WO2012056527A1 PCT/JP2010/069063 JP2010069063W WO2012056527A1 WO 2012056527 A1 WO2012056527 A1 WO 2012056527A1 JP 2010069063 W JP2010069063 W JP 2010069063W WO 2012056527 A1 WO2012056527 A1 WO 2012056527A1
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- WIPO (PCT)
- Prior art keywords
- internal combustion
- engine
- valve timing
- combustion engine
- valve
- Prior art date
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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
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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
- 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
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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
- F02D13/0203—Variable control of intake and exhaust valves
- F02D13/0215—Variable control of intake and exhaust valves changing the valve timing only
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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
- F02D13/0223—Variable control of the intake valves only
- F02D13/0226—Variable control of the intake valves only changing valve lift or valve lift and timing
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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
- F02D13/0223—Variable control of the intake valves only
- F02D13/0226—Variable control of the intake valves only changing valve lift or valve lift and timing
- F02D13/023—Variable control of the intake valves only changing valve lift or valve lift and timing the change of valve timing is caused by the change in valve lift, i.e. both valve lift and timing are functionally related
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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
- F02D41/30—Controlling fuel injection
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N11/00—Starting of engines by means of electric motors
- F02N11/08—Circuits or control means specially adapted for starting of engines
- F02N11/0814—Circuits or control means specially adapted for starting of engines comprising means for controlling automatic idle-start-stop
- F02N11/0818—Conditions for starting or stopping the engine or for deactivating the idle-start-stop mode
- F02N11/0825—Conditions for starting or stopping the engine or for deactivating the idle-start-stop mode related to prevention of engine restart failure, e.g. disabling automatic stop at low battery state
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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
- F01L2800/00—Methods of operation using a variable valve timing mechanism
- F01L2800/01—Starting
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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
- F01L2800/00—Methods of operation using a variable valve timing mechanism
- F01L2800/03—Stopping; Stalling
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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
- F01L2800/00—Methods of operation using a variable valve timing mechanism
- F01L2800/11—Fault detection, diagnosis
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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
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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
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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
- Y02T10/40—Engine management systems
Definitions
- the present invention relates to a control apparatus that performs intermittent operation of an on-vehicle internal combustion engine by performing automatic stop / restart control of engine operation.
- variable valve mechanism that makes the valve characteristics of an engine valve (suction / exhaust valve) variable has been put into practical use.
- a valve timing variable mechanism that varies the valve timing of the engine valve, a working angle variable mechanism that varies the operating angle of the engine valve, and the like are known.
- Patent Document 1 a device described in Patent Document 1 has been proposed as a control device for an in-vehicle internal combustion engine that is provided with a variable working angle mechanism and is mounted on a hybrid vehicle.
- the engine operation is restarted in a state where the operating angle of the engine valve is larger than the minimum operating angle of the variable range. I am doing so.
- the operating angle variable mechanism fails in a state where the operating angle of the engine valve becomes the minimum operating angle, a start failure of the in-vehicle internal combustion engine occurs. Therefore, in the control device described in the same document, when the operating angle variable mechanism fails with the operating angle of the engine valve being the minimum operating angle, the engine operation is automatically stopped in order to avoid a situation where the engine cannot be restarted. I try to ban it.
- the valve overlap of the intake / exhaust valve increases and the internal EGR amount increases. Therefore, if the variable valve timing mechanism or the variable operating angle mechanism breaks down while the valve overlap is increased, the internal EGR amount becomes excessive when the engine operation is restarted, causing misfire and worsening the emission.
- variable valve mechanism when a failure occurs in the variable valve mechanism, depending on the content of the failure, even if the engine operation can be restarted, the engine vibration accompanying the start increases, giving the driver a sense of discomfort, Misfires can cause emissions to deteriorate.
- the present invention has been made in view of such circumstances, and the problem to be solved is that the engine vibration at the time of restart increases due to a failure of the variable valve mechanism, which gives the driver a sense of incongruity.
- Another object of the present invention is to provide a control device for an on-vehicle internal combustion engine that can suitably avoid at least one of occurrence of misfire and deterioration of emission.
- the present invention is applied to an in-vehicle internal combustion engine having an intake side valve timing variable mechanism that varies the valve timing of the intake valve, and performs the automatic stop / restart of engine operation to perform the in-vehicle
- an intake side valve timing variable mechanism has failed at an operating position that is more advanced than a most retarded position where the valve timing of the intake valve is the most retarded of the variable range.
- An automatic stop prohibiting unit for prohibiting automatic stop of engine operation is provided.
- the valve timing of the intake valve is If the intake side valve timing variable mechanism breaks down at the operating position that is more advanced than the most retarded position that is the most retarded angle in the variable range, engine vibration accompanying restart increases and may cause the driver to feel uncomfortable. is there. Further, when the valve timing of the intake valve is advanced, the valve overlap with the exhaust valve becomes large and the internal EGR increases, and as a result, misfire may occur and the emission may deteriorate.
- the automatic stop prohibiting section prohibits the automatic stop of the engine operation. Therefore, according to the present invention described above, due to a failure of the variable valve mechanism, the engine vibration at the time of restarting becomes large, giving the driver a sense of incongruity, or causing misfire and worsening the emission. At least one of the above can be suitably avoided.
- variable valve mechanism causes the intake valve closing timing to be reduced when the intake valve timing variable mechanism is located at the most retarded position. This is particularly noticeable in an in-vehicle internal combustion engine that is retarded to the middle stage and reduces the actual compression ratio of the in-vehicle internal combustion engine at the time of restart. Therefore, the present invention is particularly effective when applied to an in-vehicle internal combustion engine having such an intake side valve timing variable mechanism.
- the intake side valve timing variable mechanism fails, if the operation amount of the intake side valve timing variable mechanism from the most retarded position to the operating position where the failure occurred is sufficiently small, the engine automatically restarts without any problem. It can be performed. Therefore, even if a failure occurs in the intake valve timing variable mechanism, if the operation amount of the intake valve timing variable mechanism from the most retarded position to the operation position where the failure occurs is equal to or less than the prescribed determination value If the automatic stop prohibition part is configured to allow automatic stop of engine operation, the frequency of automatic stop of engine operation is minimized while suppressing engine vibration and misfire during automatic engine restart. Can be fastened.
- the occurrence of misfire due to excessive internal EGR when the engine is started depends on the valve overlap amount of the intake and exhaust valves. Therefore, even if the intake-side valve timing variable mechanism fails at a position where the valve timing of the intake valve has advanced to some extent, if the valve timing of the exhaust valve is sufficiently advanced, the occurrence of misfire can be stopped. Even if the valve timing advance amount of the intake valve at the time of failure is small, misfire may occur if the valve timing of the exhaust valve is on the retard side. Therefore, in an in-vehicle internal combustion engine that further includes an exhaust side valve timing variable mechanism that changes the valve timing of the exhaust valve in addition to the intake side valve timing variable mechanism, it is desirable to configure the automatic stop prohibiting section as follows.
- the automatic stop prohibiting unit may be configured to prohibit the stop and to variably set the determination value according to the valve timing of the exhaust valve at that time. In such a case, the frequency at which the engine operation is automatically stopped can be kept to the minimum necessary while suppressing the occurrence of misfire during automatic engine restart.
- valve timing of the exhaust valve is advanced to reduce the valve overlap of the intake and exhaust valves, thereby reducing the internal EGR.
- the exhaust side valve timing variable mechanism fails at the operating position that is retarded from the most advanced position where the valve timing of the exhaust valve is the most advanced angle of the variable range, the internal EGR cannot be reduced sufficiently. A misfire may occur, leading to worse emissions.
- the present invention is applied to an in-vehicle internal combustion engine having an exhaust side valve timing variable mechanism that makes the valve timing of an exhaust valve variable, and automatic stop / restart of engine operation is performed.
- the control device that performs the intermittent operation of the on-vehicle internal combustion engine, the exhaust valve timing variable at the operating position that is retarded from the most advanced position where the valve timing of the exhaust valve is the most advanced angle of the variable range.
- an automatic stop prohibiting unit that prohibits automatic stop of engine operation is provided.
- the valve timing of the exhaust valve is advanced to reduce the valve overlap of the intake / exhaust valve, thereby reducing the internal EGR amount and reducing misfire during restart. It may be suppressed.
- the internal EGR amount can be sufficiently reduced if the exhaust side valve timing variable mechanism breaks down at the operation position retarded from the most advanced position where the valve timing of the exhaust valve is the most advanced angle of the variable range. Without a fire, the emission will be worsened.
- the automatic stop prohibiting unit prohibits the automatic stop of the engine operation. Therefore, according to the present invention, it is possible to suitably avoid the occurrence of misfire due to the failure of the variable valve mechanism and the deterioration of emissions.
- the exhaust valve from the most advanced position where the valve timing of the exhaust valve is the most advanced angle of the variable range to the operating position where the failure occurred If the operation amount of the timing variable mechanism is sufficiently small, automatic engine restart can be performed without any trouble. Therefore, even if a failure occurs in the exhaust side valve timing variable mechanism, if the operation amount of the exhaust side valve timing variable mechanism from the most advanced position to the operating position where the failure occurs is less than the prescribed judgment value If the automatic stop prohibiting part is configured to allow automatic stop of engine operation, it is possible to suppress the occurrence of misfire at the time of automatic engine restart and to keep the frequency of automatic stop of engine operation to the minimum necessary. become able to.
- the present invention is applied to an on-vehicle internal combustion engine having a variable working angle mechanism that varies a working angle of an engine valve, and performs automatic stop / restart of engine operation.
- the control device for intermittent operation of the in-vehicle internal combustion engine when the operating angle variable mechanism is normal, the engine valve is automatically restarted with the operating angle of the engine valve set to the minimum operating angle in the variable range, and the engine valve
- an automatic stop prohibiting unit that prohibits automatic stop of engine operation is provided.
- the working angle may be reduced to reduce the valve overlap of the intake and exhaust valves, thereby reducing internal EGR and suppressing misfire during restart.
- the operating angle variable mechanism fails at an operating position where the operating angle of the engine valve is larger than the minimum operating angle of the variable range, the internal EGR cannot be reduced sufficiently and a misfire occurs, resulting in an emission. Will be worsened.
- the automatic stop prohibiting section prohibits the automatic stop of the engine operation. Therefore, according to the present invention, it is possible to suitably avoid the occurrence of misfire due to the failure of the variable valve mechanism and the deterioration of emissions.
- the operating amount of the variable operating angle mechanism from the operating position where the operating angle of the engine valve is the minimum operating angle of the variable range to the operating position where the failure occurred If is sufficiently small, automatic engine restart can be performed without hindrance. Therefore, even if a failure occurs in the variable operating angle mechanism, the operating amount of the variable operating angle mechanism from the operating position where the operating angle of the engine valve is the minimum operating angle in the variable range to the operating position where the failure occurred If the automatic stop prohibiting part is configured to allow automatic stop of engine operation, the engine operation is automatically stopped while suppressing the occurrence of misfire during automatic engine restart. Frequency can be kept to the minimum necessary.
- the vehicle-mounted internal combustion engine 15 and the motor 13 are provided with two drive sources, and the vehicle-mounted internal combustion engine 15 is mechanically directly connected to the vehicle shaft (drive shaft) 14. It is applied to a hybrid vehicle having the above-described configuration.
- the on-vehicle internal combustion engine to which the control device of the present embodiment is applied includes an intake side valve timing variable mechanism 2 that makes the valve timing of the intake valve 11 variable, and an exhaust side valve timing that makes the valve timing of the exhaust valve 12 variable.
- the variable mechanism 3 and the two mechanisms are provided as a variable valve mechanism.
- the control device for the on-vehicle internal combustion engine 15 of the present embodiment is configured around an on-board electronic control unit 1.
- the electronic control unit 1 includes a central processing unit (CPU) that performs various arithmetic processes related to vehicle control, and a read-only memory (ROM) that stores control programs and data.
- the electronic control unit 1 also includes a random access memory (RAM) that temporarily stores CPU calculation results, sensor detection results, and the like, and an input / output port (I / O) that functions as an interface that mediates input / output of signals to / from the outside. O).
- a drive circuit for various actuators provided in the vehicle is connected to the output port of the electronic control unit 1.
- an intake side valve timing variable mechanism 2 that makes the valve timing of the intake valve 11 variable
- an exhaust side valve timing variable mechanism 3 that makes the valve timing of the exhaust valve 12 variable
- an injector 4 that injects and supplies fuel
- a drive circuit for the spark plug 5 for igniting the fuel supplied to the electronic control unit 1 is connected to the output port of the electronic control unit 1.
- various sensors provided in each part of the vehicle are connected to the input port of the electronic control unit 1.
- a vehicle speed sensor 6 that detects the vehicle speed
- an NE sensor 7 that detects the engine rotation speed
- an accelerator operation amount sensor 8 that detects an accelerator operation amount (for example, an accelerator pedal depression amount)
- an intake air that detects the valve timing of the intake valve 11
- a side VT sensor 9 and an exhaust side VT sensor 10 that detects the valve timing of the exhaust valve 12 are connected to the input port of the electronic control unit 1.
- the electronic control unit 1 drives the intake side valve timing variable mechanism 2 and the exhaust side valve timing variable mechanism 3 in accordance with the engine operating state to thereby control the intake valve 11 and the exhaust valve. Twelve variable controls are implemented.
- FIG. 2 shows how the valve lift curves of the intake valve 11 and the exhaust valve 12 change according to such variable valve timing.
- valve lift curves of the intake valve 11 and the exhaust valve 12 at the time of starting the engine are shown by solid lines.
- the intake side valve timing variable mechanism 2 at the time of engine start is positioned at the operating position where the valve timing of the intake valve 11 is the most retarded angle of the variable range, that is, the most retarded position.
- the closing timing of the intake valve 11 is delayed until the middle of the compression stroke.
- the engine compression at the time of starting the engine is suppressed by performing decompression and lowering the actual compression ratio by the delay of the closing timing of the intake valve 11.
- the exhaust-side valve timing variable mechanism 3 at the time of starting the engine is positioned at the operating position where the valve timing of the exhaust valve 12 is the most advanced angle of the variable range, that is, the most advanced angle position.
- the valve overlap of the intake / exhaust valves is set to 0, thereby reducing the internal EGR and suppressing the occurrence of misfire when starting the engine.
- the electronic control unit 1 changes the driving force distribution of the in-vehicle internal combustion engine 15 and the motor 13 according to the traveling state of the vehicle.
- the motor travels when the vehicle starts, and the engine travels during steady operation of the vehicle. Therefore, in this vehicle, intermittent operation of the engine operation is performed when the vehicle is stopped or during traveling, that is, the automatic stop and the automatic restart of the in-vehicle internal combustion engine 15 are repeated.
- the operation position of the intake side valve timing variable mechanism 2 at the time of starting the engine cannot be set to the most retarded position due to failure of the intake side valve timing variable mechanism 2 due to sticking or the like, sufficient decompression cannot be performed, The engine vibration at the start of the engine increases. Further, when the operating position of the exhaust side valve timing variable mechanism 3 at the time of starting the engine cannot be set to the most advanced position due to a failure of the exhaust side valve timing variable mechanism 3 due to sticking or the like, the internal EGR increases and the engine starts. Sometimes misfire occurs.
- the failure of the variable valve timing mechanism includes the sticking of a movable member inside the mechanism and the engagement of a sleeve of an oil control valve that controls the drive hydraulic pressure of the variable mechanism.
- the intake side valve timing variable mechanism 2 is broken at the operation position on the advance side of the most retarded angle position where the valve timing of the intake valve 11 is the most retarded angle of the variable range.
- automatic stop of engine operation is prohibited, and intermittent operation of the in-vehicle internal combustion engine 15 is prohibited.
- the exhaust side valve timing variable mechanism 3 is malfunctioning at the operation position that is retarded from the most advanced position where the valve timing of the exhaust valve 12 is the most advanced angle of the variable range.
- the automatic stop of the engine operation is prohibited, and the intermittent operation of the in-vehicle internal combustion engine 15 is prohibited.
- FIG. 3 shows a flowchart of an intermittent operation execution determination routine applied to this embodiment. The processing of this routine is repeatedly executed periodically by the electronic control unit 1 while the vehicle is traveling.
- step S100 the electronic control unit 1 advances the advance angle failure of the intake side valve timing variable mechanism 2 (intake VT) or retards the exhaust side valve timing variable mechanism 3 (exhaust VT). Check if a failure has occurred.
- the advance angle failure here refers to a failure of the intake side valve timing variable mechanism 2 at the operation position on the advance side with respect to the most retarded position.
- the retard failure indicates a failure of the exhaust side valve timing variable mechanism 3 at the operation position that is retarded from the most advanced angle position.
- the electronic control unit 1 If no failure has occurred (S100: NO), the electronic control unit 1 permits the automatic stop of the in-vehicle internal combustion engine 15, that is, the intermittent operation of the in-vehicle internal combustion engine 15 in step S101. The processing of this routine is terminated. If any failure has occurred (S100: YES), the electronic control unit 1 prohibits the automatic stop of the in-vehicle internal combustion engine 15, that is, the intermittent operation of the in-vehicle internal combustion engine 15 in step S102. This routine ends.
- the electronic control unit 1 has a configuration corresponding to the automatic stop unit in the present invention. According to the control apparatus for the in-vehicle internal combustion engine 15 of the present embodiment described above, the following effects can be obtained.
- the control device for the in-vehicle internal combustion engine 15 is applied to the in-vehicle internal combustion engine 15 including the intake side valve timing variable mechanism 2 that makes the valve timing of the intake valve 11 variable to automatically stop the engine operation. / Restarting is performed so that the in-vehicle internal combustion engine 15 is intermittently operated.
- the intake side valve timing variable mechanism 2 is malfunctioning at the operation position on the advance side of the most retarded position where the valve timing of the intake valve 11 is the most retarded angle of the variable range.
- the electronic control unit 1 prohibits automatic stop of engine operation.
- the in-vehicle internal combustion engine 15 that restarts the engine operation in a state where the valve timing of the intake valve 11 is set to the most retarded angle in order to suppress engine vibration at the time of restarting, the in-vehicle internal combustion engine 15 is moved to the operation position on the advance side of the most retarded position. If the intake side valve timing variable mechanism 2 breaks down, the engine vibration accompanying the restart may increase, and the driver may feel uncomfortable. Further, when the valve timing of the intake valve 11 is advanced, the valve overlap with the exhaust valve 12 becomes large and the internal EGR increases, and as a result, misfire may occur and the emission may deteriorate.
- the electronic control unit 1 prohibits the automatic stop of the engine operation. Therefore, according to the control apparatus for the in-vehicle internal combustion engine 15 of the present embodiment, the engine vibration at the time of restart increases due to the failure of the intake side valve timing variable mechanism 2 which is a variable valve mechanism, and the driver It is possible to suitably avoid at least one of giving a sense of incongruity to the above, or causing emission of fire due to misfire.
- the control device for the in-vehicle internal combustion engine 15 is applied to the in-vehicle internal combustion engine 15 including the exhaust side valve timing variable mechanism 3 that makes the valve timing of the exhaust valve 12 variable to automatically stop the engine operation. / Restarting is performed so that the in-vehicle internal combustion engine 15 is intermittently operated.
- the exhaust side valve timing variable mechanism 3 is malfunctioning at the operation position that is retarded from the most advanced position where the valve timing of the exhaust valve 12 is the most advanced angle of the variable range.
- the electronic control unit 1 prohibits automatic stop of engine operation.
- the valve timing of the exhaust valve 12 is advanced to reduce the valve overlap of the intake and exhaust valves.
- the amount of EGR may be reduced to suppress misfire during restart.
- the exhaust side valve timing variable mechanism 3 breaks down at the operating position retarded from the most advanced angle position, the internal EGR amount cannot be reduced sufficiently, resulting in misfire, leading to deterioration of emissions. It will end up.
- the electronic control unit 1 prohibits automatic stop of engine operation. Therefore, according to the present embodiment, it is possible to suitably avoid the occurrence of misfire due to a failure of the exhaust side valve timing variable mechanism 3 that is a variable valve mechanism and the deterioration of emissions.
- the operation amount of the intake side valve timing variable mechanism 2 from the most retarded position to the operating position where the failure occurs is If it is less than the prescribed judgment value ⁇ , automatic stop of engine operation is allowed. Further, in the present embodiment, even when a failure occurs in the exhaust side valve timing variable mechanism 3, the operation amount of the exhaust side valve timing variable mechanism 3 from the most advanced position to the operating position where the failure occurs is defined. In this case, the automatic stop of the engine operation is permitted.
- the operation amount of the intake side valve timing variable mechanism 2 from the most retarded position to the operation position where the failure has occurred is obtained from the advance amount of the valve timing of the intake valve 11 at the time of the failure.
- the advance amount indicates the change amount of the valve timing based on the valve timing of the intake valve 11 at the most retarded position in the variable range.
- the operation amount of the exhaust side valve timing variable mechanism 3 from the most advanced position to the operation position where the failure has occurred is obtained from the retard amount of the valve timing of the exhaust valve 12 at the time of failure.
- the amount of retardation indicates the amount of change in valve timing based on the valve timing of the intake valve 11 at the most advanced position of the variable range.
- FIG. 4 shows a flowchart of an intermittent operation execution determination routine applied to the present embodiment. The processing of this routine is repeatedly executed periodically by the electronic control unit 1 while the vehicle is traveling.
- step S200 the electronic control unit 1 has a failure in the intake side valve timing variable mechanism 2 (intake VVT) and the valve timing advance amount (intake VT advance) of the intake valve 11 is reached. It is determined whether or not (angular amount) exceeds a determination value ⁇ . Further, in step S201, the electronic control unit 1 has a failure in the exhaust side valve timing variable mechanism 3 (exhaust VVT), and the valve timing retardation amount (exhaust VT retardation amount) of the exhaust valve 12 has the determination value ⁇ . Determine if it has exceeded.
- step S200 or S201 the electronic control unit 1 automatically stops the in-vehicle internal combustion engine 15 in step S202, that is, the in-vehicle internal combustion engine 15 After this intermittent operation is permitted, the processing of this routine is terminated.
- step S200 or S201 S200: YES or S201: YES
- the electronic control unit 1 automatically stops the in-vehicle internal combustion engine 15, that is, intermittent operation of the in-vehicle internal combustion engine 15, in step S203. Is prohibited, and the processing of this routine is terminated.
- the following effects can be further achieved.
- (3) In the present embodiment, even when a failure occurs in the intake side valve timing variable mechanism 2, the failure occurs from the most retarded position where the valve timing of the intake valve 11 is the most retarded angle of the variable range. If the operation amount of the intake side valve timing variable mechanism 2 up to the generated operation position is equal to or less than a predetermined determination value ⁇ , automatic stop of engine operation is allowed. Further, in the present embodiment, even when a failure occurs in the exhaust side valve timing variable mechanism 3, the failure has occurred from the most advanced position where the valve timing of the exhaust valve 12 is the most advanced angle of the variable range.
- the determination value ⁇ used for determining whether or not to automatically stop the engine operation is variably set according to the valve timing of the exhaust valve 12 at that time. Specifically, a smaller value is set as the determination value ⁇ as the amount of retardation of the valve timing of the exhaust valve 12 increases.
- FIG. 5 shows a flowchart of an intermittent operation execution determination routine applied to the present embodiment. The processing of this routine is repeatedly executed periodically by the electronic control unit 1 while the vehicle is traveling.
- the electronic control unit 1 When this routine is started, the electronic control unit 1 first checks in step S300 whether or not a failure has occurred in the intake side valve timing variable mechanism 2 (intake VT). If no failure has occurred (S300: NO), the electronic control unit 1 permits the automatic stop of the in-vehicle internal combustion engine 15, that is, the intermittent operation of the in-vehicle internal combustion engine 15 in step S301. The routine processing ends.
- the electronic control unit 1 calculates a determination value ⁇ from the valve timing retardation amount (exhaust VT retardation amount) of the exhaust valve 12 at that time in step S302.
- the determination value ⁇ is set to a smaller value as the exhaust VT retardation amount is larger.
- step S303 the electronic control unit 1 determines whether or not the valve timing advance amount (intake VT advance amount) of the failed intake valve 11 exceeds the determination value ⁇ .
- the electronic control unit 1 determines whether or not the valve timing advance amount (intake VT advance amount) of the failed intake valve 11 exceeds the determination value ⁇ .
- the intake VT advance amount is equal to or smaller than the determination value ⁇ (S303: NO)
- the electronic control unit 1 permits automatic stop of the in-vehicle internal combustion engine 15, that is, intermittent operation of the in-vehicle internal combustion engine 15 in step S301. After that, the processing of this routine is finished.
- the electronic control unit 1 prohibits the automatic stop of the in-vehicle internal combustion engine 15, that is, the intermittent operation of the in-vehicle internal combustion engine 15, in step S304. After that, the processing of this routine is finished.
- the intake side valve timing variable mechanism 2 has a failure, and the operation amount of the intake side valve timing variable mechanism 2 from the most retarded position to the operating position where the failure has occurred is defined as a prescribed determination.
- the determination value ⁇ is variably set according to the valve timing of the exhaust valve 12 at that time. Therefore, it is possible to keep the frequency at which the engine operation is automatically stopped to a necessary minimum while suppressing the occurrence of misfire during automatic engine restart.
- variable valve mechanism As a variable valve mechanism that is applied to the in-vehicle internal combustion engine 15, there is known a variable operating angle mechanism that makes the operating angle of the engine valve variable, for example, in the manner shown in FIG. FIG. 6 shows the transition of the intake valve 11 working angle when the working angle of the intake valve 11 is variable.
- the valve overlap amount of the intake and exhaust valves is reduced by automatically restarting the engine operation with the working angle of the engine valve set to the minimum working angle within the variable range. It may be reduced to suppress the occurrence of misfire by suppressing the internal EGR.
- the operating angle variable mechanism fails at the operating position where the operating angle of the engine valve is larger than the minimum operating angle, the operating angle of the engine valve at the time of automatic engine restart is larger than the original. Thus, the internal EGR becomes excessive, and misfire may occur.
- the operating angle variable mechanism when the operating angle variable mechanism is malfunctioning at an operating position where the operating angle of the engine valve is larger than the minimum operating angle, automatic stop of engine operation is prohibited. Yes.
- the operating angle from the operating position where the operating angle of the engine valve is the minimum operating angle of the variable range to the operating position where the failure occurred. If the amount of operation of the variable mechanism is less than the prescribed judgment value, automatic stop of engine operation is allowed.
- FIG. 7 shows a flowchart of an intermittent operation execution determination routine applied to the present embodiment. The processing of this routine is repeatedly executed periodically by the electronic control unit 1 while the vehicle is traveling.
- the electronic control unit 1 first determines in step S400 whether or not a failure has occurred in the operating angle variable mechanism and the operating angle at that time exceeds a predetermined determination value ⁇ . To do. When a negative determination is made here (S400: NO), the electronic control unit 1 permits the automatic stop of the in-vehicle internal combustion engine 15, that is, the intermittent operation of the in-vehicle internal combustion engine 15 in step S401, and then performs the present routine. Terminate the process. In addition, when a failure occurs in the operating angle variable mechanism and the operating angle at that time exceeds the prescribed determination value ⁇ (S400: YES), the electronic control unit 1 automatically performs the automatic operation of the on-vehicle internal combustion engine 15 in step S402. After stopping the stop, that is, intermittent operation of the in-vehicle internal combustion engine 15, is prohibited.
- the control device for the on-vehicle internal combustion engine 15 is applied to the on-vehicle internal combustion engine 15 including a working angle variable mechanism that makes the working angle of the engine valve variable, and automatically stops / restarts engine operation.
- the vehicle-mounted internal combustion engine 15 is intermittently operated.
- the electronic control unit 1 automatically restarts the engine operation with the operating angle of the engine valve set to the minimum operating angle in the variable range, and the engine valve
- the operating angle variable mechanism is malfunctioning at the operating position where the operating angle is larger than the minimum operating angle, the automatic stop of the engine operation is prohibited.
- the working angle is reduced to reduce the valve overlap of the intake and exhaust valves, thereby reducing internal EGR and suppressing misfire during restart. is there.
- the operating angle variable mechanism fails at an operating position where the operating angle of the engine valve is larger than the minimum operating angle, the internal EGR cannot be sufficiently reduced, and misfire occurs, leading to worsening of emissions. It comes to be.
- the electronic control unit 1 prohibits automatic stop of engine operation. Therefore, according to the present embodiment, it is possible to preferably avoid the occurrence of misfire due to the failure of the variable operating angle mechanism, which is a variable valve mechanism, and the deterioration of emissions.
- the operating position from the operating position where the operating angle of the engine valve is the minimum operating angle of the variable range to the operating position where the failure occurred If the operating amount of the variable operating angle mechanism is equal to or less than a predetermined determination value, automatic stop of engine operation is permitted. However, if it is desired to reliably suppress the occurrence of misfire during automatic engine restart due to a failure of the variable operating angle mechanism, an operating position other than the operating position where the operating angle of the engine valve is the minimum operating angle of the variable range is used. When the operating angle variable mechanism breaks down, it is preferable to prohibit automatic stop of engine operation.
- the determination value ⁇ is obtained according to the valve timing retardation amount of the exhaust valve 12, and when the valve timing advance amount of the intake valve 11 exceeds the determination value ⁇ , the engine operation is automatically performed.
- the same determination can be made based on the valve overlap amount of the intake and exhaust valves. That is, when a failure occurs in the intake side valve timing variable mechanism 2, whether or not the automatic stop of the engine operation is prohibited is determined depending on whether or not the valve overlap amount at that time exceeds a predetermined determination value.
- variable valve timing mechanism is provided on both the intake side and the exhaust side, and the automatic stop of the engine operation is prohibited according to the content of any failure.
- the present invention can also be applied to an in-vehicle internal combustion engine that includes a variable valve timing mechanism on either the intake side or the exhaust side.
- control device of the present invention is applied to a vehicle-mounted internal combustion engine mounted on a hybrid vehicle including two drive sources, that is, the vehicle-mounted internal combustion engine and a motor.
- the same can be applied to an in-vehicle internal combustion engine mounted on a vehicle other than the above.
- economy running control that automatically stops engine operation when the vehicle is stopped, such as when waiting for a signal
- automatic stop and automatic restart of the engine operation are repeatedly performed. Therefore, even in such an in-vehicle internal combustion engine, depending on the content of the failure of the variable valve mechanism, engine vibration that cannot be ignored during automatic engine restart or misfire occurs.
- SYMBOLS 1 Electronic control unit (automatic stop prohibition part), 2 ... Intake side valve timing variable mechanism, 3 ... Exhaust side valve timing variable mechanism, 4 ... Injector, 5 ... Spark plug, 6 ... Vehicle speed sensor, 7 ... NE sensor, 8 Accelerator sensor, 9 ... Intake side VT sensor, 10 ... Exhaust side VT sensor, 11 ... Intake valve, 12 ... Exhaust valve, 13 ... Motor, 14 ... Vehicle shaft, 15 ... In-vehicle internal combustion engine.
Abstract
Description
以下、本発明の車載内燃機関の制御装置を具体化した第1の実施の形態を、図1~図3を参照して詳細に説明する。なお、本実施の形態は、図1に示すように、車載内燃機関15とモーター13との2つの駆動源を備え、かつ車載内燃機関15が車両軸(ドライブシャフト)14と機械的に直結された構成のハイブリッド車両に適用されるものとなっている。また本実施の形態の制御装置の適用される車載内燃機関は、吸気バルブ11のバルブタイミングを可変とする吸気側バルブタイミング可変機構2と、排気バルブ12のバルブタイミングを可変とする排気側バルブタイミング可変機構3との2つの機構を可変動弁機構として備えるものとなっている。
以上説明した本実施の形態の車載内燃機関15の制御装置によれば、次の効果を奏することができる。
第1の実施の形態では、最遅角位置以外の動作位置にて吸気側バルブタイミング可変機構2が故障したときには、車載内燃機関15の自動停止を禁止するようにしていた。また第1の実施の形態では、最進角位置以外の動作位置にて排気側バルブタイミング可変機構3が故障したときにも、車載内燃機関15の自動停止を禁止するようにしていた。もっとも、故障が発生した動作位置によっては、機関振動や失火を問題とならない程度に抑制して機関自動再始動を行えることがある。
(3)本実施の形態では、吸気側バルブタイミング可変機構2に故障が発生した場合であっても、吸気バルブ11のバルブタイミングをその可変範囲の最遅角とする最遅角位置から故障が発生した動作位置までの吸気側バルブタイミング可変機構2の動作量が規定の判定値α以下であれば、機関運転の自動停止を許容するようにしている。また本実施の形態では、排気側バルブタイミング可変機構3に故障が発生した場合であっても、排気バルブ12のバルブタイミングをその可変範囲の最進角とする最進角位置から故障が発生した動作位置までの排気側バルブタイミング可変機構3の動作量が規定の判定値β以下であるときにも、機関運転の自動停止を許容するようにしている。そのため、機関自動再始動時の機関振動や失火の発生を抑えつつも、機関運転の自動停止がなされる頻度を必要最小に留めることができるようになる。
上述したように、機関始動時における内部EGR過多による失火の発生は、吸排気バルブのバルブオーバーラップ量に依存する。そのため、吸気バルブ11のバルブタイミングがある程度進角した位置で吸気側バルブタイミング可変機構2が故障していても、排気バルブ12のバルブタイミングが十分進角されていれば、失火の発生を留めることができる。また故障したときの吸気バルブ11のバルブタイミングの進角量が小さくても、排気バルブ12のバルブタイミングが遅角側にあれば、失火が発生することもある。
(4)本実施の形態では、吸気側バルブタイミング可変機構2に故障が発生し、且つ最遅角位置から故障が発生した動作位置までの吸気側バルブタイミング可変機構2の動作量が規定の判定値γを超えるときに機関運転の自動停止を禁止するようにしている。その上、本実施の形態では、そのときの排気バルブ12のバルブタイミングに応じて判定値γの値を可変設定するようにしている。そのため、機関自動再始動時における失火の発生を抑えつつも、機関運転の自動停止がなされる頻度を必要最小に留めることができるようになる。
車載内燃機関15に適用される可変動弁機構として、例えば図6に示されるような態様で、機関バルブの作用角を可変とする作用角可変機構が知られている。なお、図6には、吸気バルブ11の作用角を可変とする場合の吸気バルブ11作用角の遷移が示されている。
(5)本実施の形態に係る車載内燃機関15の制御装置は、機関バルブの作用角を可変とする作用角可変機構を備える車載内燃機関15に適用されて、機関運転の自動停止/再始動を実施して前記車載内燃機関15の間欠運転を行っている。また本実施の形態では、電子制御ユニット1は、作用角可変機構の正常時には、機関バルブの作用角をその可変範囲の最小作用角とした状態で機関運転の自動再始動を行うとともに、機関バルブの作用角を最小作用角よりも大きい作用角とする動作位置で作用角可変機構が故障しているときには、機関運転の自動停止を禁止するようにしている。
・第4の実施の形態では、作用角可変機構に故障が発生した場合であっても、機関バルブの作用角をその可変範囲の最小作用角とする動作位置から故障の発生した動作位置までの作用角可変機構の動作量が規定の判定値以下であれば、機関運転の自動停止を許容するようにしていた。もっとも、作用角可変機構の故障に伴う機関自動再始動時の失火の発生を確実に抑えたいのであれば、機関バルブの作用角をその可変範囲の最小作用角とする動作位置以外の動作位置で作用角可変機構が故障したときには、機関運転の自動停止を禁止するようにすると良い。
Claims (10)
- 吸気バルブのバルブタイミングを可変とする吸気側バルブタイミング可変機構を備える車載内燃機関に適用されて、機関運転の自動停止/再始動を実施して前記車載内燃機関の間欠運転を行う制御装置において、
前記吸気バルブのバルブタイミングをその可変範囲の最遅角とする最遅角位置よりも進角側の動作位置にて前記吸気側バルブタイミング可変機構が故障しているときには、機関運転の自動停止を禁止する自動停止禁止部を備える
ことを特徴とする車載内燃機関の制御装置。 - 前記吸気側バルブタイミング可変機構は、前記最遅角位置に位置することで、前記吸気バルブの閉弁時期を圧縮行程中期まで遅角する
請求項1に記載の車載内燃機関の制御装置。 - 前記自動停止禁止部は、前記吸気側バルブタイミング可変機構に故障が発生した場合であっても、前記最遅角位置から故障が発生した動作位置までの前記吸気側バルブタイミング可変機構の動作量が規定の判定値以下であれば、機関運転の自動停止を許容する
請求項1又は2に記載の車載内燃機関の制御装置。 - 前記車載内燃機関は、排気バルブのバルブタイミングを可変とする排気側バルブタイミング可変機構をさらに備えるものであり、
前記自動停止禁止部は、そのときの前記排気バルブのバルブタイミングに応じて前記判定値を可変とする
請求項3に記載の車載内燃機関の制御装置。 - 前記車載内燃機関は、排気バルブのバルブタイミングを可変とする排気側バルブタイミング可変機構をさらに備えるものであり、
前記自動停止禁止部は、前記排気バルブのバルブタイミングをその可変範囲の最進角とする最進角位置よりも遅角側の動作位置にて前記排気側バルブタイミング可変機構が故障しているときにも、機関運転の自動停止を禁止する
請求項1~4のいずれか1項に記載の車載内燃機関の制御装置。 - 排気バルブのバルブタイミングを可変とする排気側バルブタイミング可変機構を備える車載内燃機関に適用されて、機関運転の自動停止/再始動を実施して前記車載内燃機関の間欠運転を行う制御装置において、
前記排気バルブのバルブタイミングをその可変範囲の最進角とする最進角位置よりも遅角側の動作位置にて前記排気側バルブタイミング可変機構が故障しているときには、機関運転の自動停止を禁止する自動停止禁止部を備える
ことを特徴とする車載内燃機関の制御装置。 - 前記自動停止禁止部は、前記排気側バルブタイミング可変機構に故障が発生した場合であっても、前記最進角位置から故障が発生した動作位置までの前記排気側バルブタイミング可変機構の動作量が規定の判定値以下であれば、機関運転の自動停止を許容する
請求項6又は7に記載の車載内燃機関の制御装置。 - 機関バルブの作用角を可変とする作用角可変機構を備える車載内燃機関に適用されて、機関運転の自動停止/再始動を実施して前記車載内燃機関の間欠運転を行う制御装置において、
前記作用角可変機構の正常時には、前記機関バルブの作用角をその可変範囲の最小作用角とした状態で機関運転の自動再始動を行うとともに、
前記機関バルブの作用角を前記最小作用角よりも大きい作用角とする動作位置で前記作用角可変機構が故障しているときには、機関運転の自動停止を禁止する自動停止禁止部を備える
ことを特徴とする車載内燃機関の制御装置。 - 前記自動停止禁止部は、前記作用角可変機構に故障が発生した場合であっても、前記機関バルブの作用角をその可変範囲の最小作用角とする動作位置から故障の発生した動作位置までの前記作用角可変機構の動作量が規定の判定値以下であれば、機関運転の自動停止を許容する
請求項8に記載の車載内燃機関の制御装置。 - 前記車載内燃機関は、同車載内燃機関とモーターとの2つの駆動源を備えるハイブリッド車両に搭載されている
請求項1~9のいずれか1項に記載の車載内燃機関の制御装置。
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US13/880,174 US9657657B2 (en) | 2010-10-27 | 2010-10-27 | Control device for in-vehicle internal combustion engine |
DE112010005962.4T DE112010005962B4 (de) | 2010-10-27 | 2010-10-27 | Steuervorrichtung für eine fahrzeuggestützte Verbrennungskraftmaschine |
PCT/JP2010/069063 WO2012056527A1 (ja) | 2010-10-27 | 2010-10-27 | 車載内燃機関の制御装置 |
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JP2010031702A (ja) * | 2008-07-25 | 2010-02-12 | Toyota Motor Corp | エンジンの制御装置 |
JP2010048194A (ja) * | 2008-08-22 | 2010-03-04 | Nippon Soken Inc | 内燃機関の始動制御装置 |
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JP2015116967A (ja) * | 2013-12-19 | 2015-06-25 | トヨタ自動車株式会社 | ハイブリッド車両 |
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JP5429398B2 (ja) | 2014-02-26 |
DE112010005962B4 (de) | 2016-02-11 |
CN103189624A (zh) | 2013-07-03 |
JPWO2012056527A1 (ja) | 2014-03-20 |
US20130206105A1 (en) | 2013-08-15 |
DE112010005962T5 (de) | 2013-07-25 |
US9657657B2 (en) | 2017-05-23 |
CN103189624B (zh) | 2015-12-16 |
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