WO2014068670A1 - 内燃機関の制御装置 - Google Patents
内燃機関の制御装置 Download PDFInfo
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- WO2014068670A1 WO2014068670A1 PCT/JP2012/078026 JP2012078026W WO2014068670A1 WO 2014068670 A1 WO2014068670 A1 WO 2014068670A1 JP 2012078026 W JP2012078026 W JP 2012078026W WO 2014068670 A1 WO2014068670 A1 WO 2014068670A1
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- valve
- intake
- exhaust
- opening period
- valve opening
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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
- F02D13/0207—Variable control of intake and exhaust valves 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
- F02D13/0203—Variable control of intake and exhaust valves
- F02D13/0207—Variable control of intake and exhaust valves changing valve lift or valve lift and timing
- F02D13/0211—Variable control of intake and exhaust valves 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
- 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
- F02D13/0219—Variable control of intake and exhaust valves changing the valve timing only by shifting the phase, i.e. the opening periods of the valves are constant
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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
- 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
- F02D41/08—Introducing corrections for particular operating conditions for idling
- F02D41/086—Introducing corrections for particular operating conditions for idling taking into account the temperature of the engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/0261—Controlling the valve overlap
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/0269—Controlling the valves to perform a Miller-Atkinson cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- 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
- F02D2013/0292—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation in the start-up phase, e.g. for warming-up cold engine or catalyst
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/021—Engine temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/01—Internal exhaust gas recirculation, i.e. wherein the residual exhaust gases are trapped in the cylinder or pushed back from the intake or the exhaust manifold into the combustion chamber without the use of additional passages
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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
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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 device for an internal combustion engine.
- variable valve mechanism for an internal combustion engine
- a mechanism capable of changing the valve opening period and valve timing is known.
- the device described in Patent Document 1 includes a variable valve mechanism that changes the valve opening period of the intake valve and a variable valve mechanism that changes the valve timing of the exhaust valve.
- the device described in Patent Document 1 suppresses an increase in the valve overlap amount by advancing the valve timing of the exhaust valve and advancing the valve closing timing when increasing the valve opening period of the intake valve. I am doing so.
- An object of the present invention is to provide a control device for an internal combustion engine that can suppress a decrease in energy efficiency of an engine while suppressing an increase in valve overlap amount when an opening period of an intake valve is increased.
- a control device for an internal combustion engine that solves the above problems includes a first variable valve mechanism that changes a valve opening period of an intake valve, a second variable valve mechanism that changes a valve open period of an exhaust valve, And a control unit that controls driving of the second variable valve mechanism.
- the control unit executes a process of increasing the valve opening period of the intake valve and decreasing the valve opening period of the exhaust valve.
- the valve opening period of the intake valve is increased and the valve opening period of the exhaust valve is decreased. If the valve opening period of the exhaust valve is reduced in this way, the valve closing timing of the exhaust valve is advanced and the valve opening timing of the exhaust valve is retarded. Therefore, the valve closing timing of the exhaust valve can be advanced without advancing the valve opening timing of the exhaust valve. Accordingly, it is possible to suppress a decrease in the energy efficiency of the engine while suppressing an increase in the valve overlap amount when increasing the valve opening period of the intake valve.
- control unit executes the above processing at the time of idle operation where the temperature of the internal combustion engine is higher than a reference value.
- control unit performs the above-described processing before the fuel injection is stopped due to the engine stop request.
- the load caused by the reaction force of the valve spring that urges the valve in the valve closing direction acts on the variable valve mechanism.
- Such a load tends to increase as the valve opening period is longer or as the engine speed is lower. Therefore, if the above processing is executed to increase the valve opening period of the intake valve when the engine speed is the lowest, that is, when the engine operation is stopped, a large load is applied to the variable valve mechanism.
- the processing is executed before the fuel injection is stopped by the engine stop request, that is, during the engine operation from when the engine stop is requested until the operation of the internal combustion engine is stopped.
- the engine stop request includes, for example, an operation of turning off an ignition switch for stopping the engine operation. Further, in an internal combustion engine in which automatic stop and automatic start are performed, examples of the engine stop request include establishment of an automatic stop condition.
- the internal combustion engine may be configured to be automatically stopped and automatically started, and the engine stop request may be an automatic stop request.
- the engine operation is automatically stopped and then automatically started. Often times are short. Therefore, after the automatic stop, there is a high possibility that the engine is automatically started before the engine temperature sufficiently decreases. Therefore, when the engine is started after the engine operation is automatically stopped, the above-described abnormal combustion is more likely to occur than when the engine is manually stopped.
- the valve opening period of the intake valve is increased, so that abnormal combustion may occur in an internal combustion engine that may increase the possibility of abnormal combustion. Can be suppressed appropriately.
- control unit increases the valve opening period of the exhaust valve after the fuel injection is stopped more than the valve opening period of the exhaust valve decreased by the above processing.
- the opening period of the exhaust valve at the time of starting the engine becomes longer compared to the case where the opening period of the exhaust valve that is reduced before stopping the fuel injection is maintained even after the fuel injection is stopped. . Therefore, the exhaust resistance at the time of starting the engine is reduced, and the startability of the engine is improved.
- the whole block diagram of one Embodiment of the control apparatus of an internal combustion engine The graph which shows the valve timing of the intake valve changed by the intake valve timing variable mechanism.
- Explanatory drawing which shows the valve overlap amount of an intake valve and an exhaust valve.
- the flowchart which shows the procedure of the setting process of a valve opening period The flowchart which shows the process sequence when setting a valve opening period in the modification of the embodiment.
- the combustion chamber 2 and the intake passage 3 are connected and disconnected by opening and closing the intake valve 9.
- the intake valve 9 is urged in the valve closing direction by a valve spring 16i.
- the intake valve 9 opens and closes in synchronization with the rotation of the intake camshaft 11 to which the rotation of the crankshaft 7 is transmitted.
- the combustion chamber 2 and the exhaust passage 8 are communicated and blocked by the opening / closing operation of the exhaust valve 10.
- the exhaust valve 10 is urged in the valve closing direction by a valve spring 16e.
- the exhaust valve 10 opens and closes in synchronization with the rotation of the exhaust camshaft 12 to which the rotation of the crankshaft 7 is transmitted.
- the intake valve timing variable mechanism 13i changes the intake valve timing INVT, which is the valve timing of the intake valve 9, by adjusting the relative rotational phase of the intake camshaft 11 with respect to the crankshaft 7.
- the intake valve timing varying mechanism 13 i maintains the intake valve opening period INCAM, which is the valve opening period of the intake valve 9, in an intake valve opening timing, which is the valve opening timing of the intake valve 9.
- Both IVO and the intake valve closing timing IVC, which is the closing timing of the intake valve 9, are advanced or retarded.
- the intake valve timing INVT has a reference value “0 ° CA” when the valve timing of the intake valve 9 is retarded to the maximum.
- the intake valve timing INVT is a value representing the advance amount from the maximum retard timing with respect to the valve timing of the intake valve 9.
- the intake valve timing INVT is set to “0 ° CA”, that is, the maximum retard timing.
- the intake lift amount variable mechanism 14 i is a mechanism that changes the intake lift amount INVL that is the maximum lift amount of the intake valve 9 and the intake valve opening period INCAM in synchronization with each other, and the intake lift amount INVL is As the value increases, the intake valve opening period INCAM also increases. As shown in FIG. 3, when the intake valve opening period INCAM is increased by the intake lift amount varying mechanism 14i, the intake valve opening timing IVO of the intake valve 9 is advanced and the intake valve closing timing IVC is retarded. Is done.
- the internal combustion engine 1 is also provided with a variable exhaust valve mechanism that changes the valve characteristics of the exhaust valve 10. More specifically, the internal combustion engine 1 is driven by the exhaust valve timing variable mechanism 13e that changes the valve timing of the exhaust valve 10 and the exhaust valve actuator 15e to change the maximum lift amount and the valve opening period of the exhaust valve 10. And an exhaust lift variable mechanism 14e.
- the exhaust lift variable mechanism 14e constitutes a second variable valve mechanism.
- the exhaust valve timing variable mechanism 13e changes the exhaust valve timing EXVT, which is the valve timing of the exhaust valve 10, by adjusting the relative rotational phase of the exhaust camshaft 12 with respect to the crankshaft 7.
- a control device 26 As a control unit.
- the control device 26 inputs and outputs signals to / from a CPU that executes arithmetic processing, a ROM that stores programs and data necessary for control, a RAM that temporarily stores CPU calculation results, and the outside. It has a port and so on.
- the internal combustion engine 1 is provided with various sensors for detecting the engine operating state and the like.
- the accelerator operation amount sensor 28 detects an operation amount of the accelerator pedal 27 (accelerator operation amount ACCP).
- the throttle sensor 29 detects the opening degree (throttle opening degree TA) of the throttle valve 20 provided in the intake passage 3.
- the water temperature sensor 30 detects the temperature of the cooling water of the internal combustion engine 1 (cooling water temperature THW).
- the oil temperature sensor 31 detects the temperature of the lubricating oil of the internal combustion engine 1 (oil temperature THO).
- the intake air temperature sensor 32 detects the temperature of intake air (intake air temperature THA).
- the air flow meter 33 detects the amount of air (intake air amount GA) sucked into the combustion chamber 2 through the intake passage 3.
- the crank position sensor 34 detects the rotation angle of the crankshaft 7 necessary for calculating the engine speed NE.
- the intake cam position sensor 35 i detects the rotation phase of the intake cam shaft 11.
- the intake drive amount sensor 36i detects the drive amount of the intake valve actuator 15i necessary for detecting the intake lift amount INVL and the intake valve opening period INCAM.
- the exhaust cam position sensor 35e detects the rotational phase of the exhaust camshaft 12.
- the exhaust drive amount sensor 36e detects the drive amount of the exhaust valve actuator 15e necessary for detecting the exhaust lift amount EXVL and the exhaust valve opening period EXCAM.
- An ignition switch (hereinafter referred to as an IG switch) 37 detects the presence or absence of an engine start request or an engine stop request by inputting the operation state to the control device 26. That is, when the IG switch 37 is turned on, the control device 26 determines that there is an engine start request, and when the IG switch 37 is turned off, the control device 26 determines that there is an engine stop request.
- abnormal combustion such as knocking or pre-ignition may occur.
- such abnormal combustion increases the valve opening period of the intake valve 9 to retard the intake valve closing timing IVC. More specifically, the intake valve closing timing IVC is delayed from the intake bottom dead center. If the actual compression ratio is lowered by making the angle, the temperature of the intake air compressed in the cylinder is lowered, and the occurrence thereof can be suppressed.
- control device 26 suppresses the occurrence of abnormal combustion and deterioration of startability by setting the valve characteristics before the engine stop to the state shown in FIG. , Reducing the decline in engine energy efficiency.
- the exhaust valve closing timing EVC can be advanced without advancing the exhaust valve opening timing EVO. Therefore, an increase in the valve overlap amount VOL when the valve opening period of the intake valve 9 is increased is suppressed by the advance angle of the exhaust valve closing timing EVC, thereby suppressing deterioration in startability due to the internal EGR amount. . Further, the delay of the exhaust valve opening timing EVO suppresses the state in which the exhaust valve 10 opens during the expansion stroke, thereby suppressing the reduction in the energy efficiency of the engine.
- valve opening period setting process is executed by the control device 26 at predetermined intervals.
- the control device 26 determines whether or not an automatic stop condition is satisfied (S100).
- the automatic stop condition for example, the following condition is set.
- the accelerator operation amount ACCP is “0”, and the operation state of the internal combustion engine 1 is an idle operation state.
- the control device 26 determines that the automatic stop condition is satisfied when all of the automatic stop conditions are satisfied. When the automatic stop condition is satisfied, the control device 26 determines that there is an automatic stop request.
- step S100 when the automatic stop condition is not satisfied (S100: NO), the control device 26 once ends this process.
- step S100 determines whether the temperature of the internal combustion engine 1 is higher than the reference value and the intake air temperature THA is higher than the determination temperature. It is determined whether or not (S110). In this step S110, whether or not there is a possibility of abnormal combustion during a normally set valve opening period (a first intake period INCAM1 and a first exhaust period EXCAM1 described later) is determined based on the engine temperature and the intake air temperature THA. Judgment.
- the reference value can set an engine temperature at which abnormal combustion such as knocking or pre-ignition may occur.
- the engine temperature is correlated with the coolant temperature THW and the oil temperature THO.
- step S110 the control device 26 determines that the temperature of the internal combustion engine 1 is higher than a reference value when each of the coolant temperature THW and the oil temperature THO is equal to or higher than a predetermined determination temperature. . Even when the engine temperature is high, abnormal combustion is unlikely to occur if the intake air temperature is low. Therefore, in step S110, in addition to the high temperature determination of the engine temperature based on the coolant temperature THW and the oil temperature THO, abnormal combustion may occur when the intake air temperature THA is higher than a predetermined determination temperature. In addition, the determination accuracy is increased for the possibility of abnormal combustion.
- the first intake period INCAM1 is set to a valve opening period suitable for starting the engine. For example, a valve opening period in which a sufficient amount of intake air can be introduced into the combustion chamber when the engine is started can be set. .
- the first exhaust period EXCAM1 is also set to a valve opening period suitable for engine start. For example, when the first intake period INCAM1 is set, the valve overlap amount at engine start is minimized. A valve opening period that can be set can be set.
- the control device 26 executes ignition and fuel injection stop by the automatic stop request to actually automatically stop the internal combustion engine 1 (S130). . And the control apparatus 26 once complete
- step S110 it is determined that each of the cooling water temperature THW and the oil temperature THO is higher than a predetermined determination temperature, and the temperature of the internal combustion engine 1 is higher than a reference value, and the intake air temperature THA is higher than the determination temperature.
- the control device 26 sets the intake valve opening period INCAM to the second intake period INCAM2 that is longer than the first intake period INCAM1 through the drive control of the intake lift amount variable mechanism 14i, and the exhaust lift amount variable mechanism 14e.
- the exhaust valve opening period EXCAM is set to a second exhaust period EXCAM2 shorter than the first exhaust period EXCAM1 (S140).
- the second intake period INCAM2 is set so that the actual compression ratio is lower than when the intake valve opening period INCAM is set to the first intake period INCAM1.
- the second timing is such that the closing timing of the intake valve 9 is delayed more than the intake bottom dead center.
- the value of the intake period INCAM2 is set.
- the value of the second intake period INCAM2 is set to a value larger than the value of the first intake period INCAM1.
- the second exhaust period EXCAM2 is set so that the increase in the valve overlap amount when the intake valve opening period INCAM is set to the second intake period INCAM2 can be suppressed. That is, the second intake period INCAM2 is a valve opening period longer than the first intake period INCAM1. If the intake valve opening period INCAM is increased as described above, the intake valve opening timing IVO of the intake valve 9 is advanced and the intake valve closing timing IVC is retarded. Accordingly, when the intake valve opening period INCAM is set to the second intake period INCAM2, the intake valve opening timing IVO is advanced as compared with the case where the intake valve opening period INCAM is set to the first intake period INCAM1. The overlap amount VOL increases.
- the second exhaust period EXCAM2 is set so that such an increase in the valve overlap amount can be suppressed.
- the value of the second exhaust period EXCAM2 is set so that the exhaust valve closing timing EVC is further advanced.
- the exhaust valve opening period EXCAM is increased by the variable exhaust lift amount mechanism 14e, the exhaust valve opening timing EVO is advanced and the exhaust valve closing timing EVC is retarded. Therefore, in order to advance the exhaust valve closing timing EVC, the value of the second exhaust period EXCAM2 is set to a value smaller than the value of the first exhaust period EXCAM1.
- the control device 26 executes ignition and fuel injection stop by the automatic stop request to actually automatically stop the internal combustion engine 1 (S150). .
- control device 26 sets the exhaust valve opening period EXCAM to the first exhaust period EXCAM1 through drive control of the exhaust lift variable mechanism 14e (S160).
- the exhaust valve opening period EXCAM is changed from the second exhaust period EXCAM2 to the first exhaust period EXCAM1. And the control apparatus 26 once complete
- the control device 26 opens the intake air in preparation for restart after the engine stops.
- the valve period INCAM is set to the second intake period INCAM2. That is, the control device 26 increases the intake valve opening period INCAM to be longer than the first intake period INCAM1 set at the normal time.
- valve opening period of the intake valve 9 is increased in this way, the closing timing of the intake valve 9 is retarded, so that the actual compression ratio at the time of restart can be lowered, thereby causing abnormal combustion at the time of engine start. Occurrence is suppressed.
- the control device 26 sets the exhaust valve opening period EXCAM to the second exhaust period EXCAM2 when the valve opening period of the intake valve 9 is increased. That is, the control device 26 reduces the exhaust valve opening period EXCAM to be shorter than the first exhaust period EXCAM1 set at the normal time. Therefore, as described above with reference to FIG. 7, it is possible to suppress the deterioration of the startability due to the increase in the valve overlap amount.
- the exhaust valve opening period EXCAM is set to the second exhaust period EXCAM2, and the valve opening period of the exhaust valve 10 is made shorter than the first exhaust period EXCAM1 set at the normal time, it is shown in FIG.
- the exhaust valve closing timing EVC is advanced, and the exhaust valve opening timing EVO is retarded. Therefore, the exhaust valve closing timing EVC can be advanced without advancing the exhaust valve opening timing EVO. Therefore, as described above with reference to FIG. 7, it is possible to suppress a decrease in the energy efficiency of the engine while suppressing an increase in the valve overlap amount when the valve opening period of the intake valve 9 is increased.
- the intake lift amount variable mechanism 14i when the valve characteristics such as the intake lift amount INVL and the intake valve opening period INCAM are changed by the intake lift amount variable mechanism 14i, it is caused by the reaction force of the valve spring 16i that urges the intake valve 9 in the valve closing direction.
- the load acts on the intake lift amount varying mechanism 14i.
- Such a load tends to increase as the intake lift amount INVL is larger, as the intake valve opening period INCAM is longer, or as the engine speed is lower. Therefore, the intake valve opening period INCAM is set to the second intake period INCAM2 when the engine speed is the lowest, that is, when the engine operation is stopped due to an automatic stop request, and the intake valve opening period is set to be higher than normal.
- the internal combustion engine 1 in which the automatic stop and the automatic start are performed automatically after the engine operation is automatically stopped In comparison with the case where the engine operation is manually stopped and then manually started again through the operation of the IG switch 37 or the like, the internal combustion engine 1 in which the automatic stop and the automatic start are performed automatically after the engine operation is automatically stopped.
- the time to start is often short. Therefore, after the automatic stop, there is a high possibility that the engine is automatically started before the engine temperature sufficiently decreases. Therefore, when the engine is started after the engine operation is automatically stopped, the above-described abnormal combustion is more likely to occur than when the engine is manually stopped.
- the control device 26 performs processing for setting the intake valve opening period INCAM to the second intake period INCAM2 when the automatic stop condition of the internal combustion engine 1 is satisfied, that is, when the engine is automatically stopped.
- the valve opening period of the intake valve 9 is increased from the normal time. Therefore, the occurrence of abnormal combustion can be appropriately suppressed in the internal combustion engine 1 where the possibility of occurrence of abnormal combustion may increase.
- control device 26 changes the exhaust valve opening period EXCAM from the second exhaust period EXCAM2 to the first exhaust period EXCAM1 by performing the process of step S160 shown in FIG. Therefore, the opening period of the exhaust valve 10 at the start of the engine is longer than when the exhaust valve opening period EXCAM, which has been reduced from the normal time before the stop of the fuel injection, is maintained even after the stop of the fuel injection. . Therefore, the exhaust resistance at the time of starting the engine is reduced, and the startability of the engine is improved.
- the control device 26 sets the intake valve opening period INCAM to the second intake period INCAM2, thereby increasing the valve opening period of the intake valve 9 more than the first intake period INCAM1, and the exhaust valve opening period EXCAM.
- the second exhaust period EXCAM2 a process of reducing the valve opening period of the exhaust valve 10 from the first exhaust period EXCAM1 is executed. Accordingly, it is possible to suppress a decrease in the energy efficiency of the engine while suppressing an increase in the valve overlap amount when the valve opening period of the intake valve 9 is increased.
- the control device 26 increases the valve opening period of the intake valve 9 as described above and the valve opening period of the exhaust valve 10 as described above during idle operation where the temperature of the internal combustion engine 1 is higher than the reference value. Execute the decrement processing. As a result, the occurrence of abnormal combustion at the start of the engine and the deterioration of the engine startability can be suppressed.
- the control device 26 increases the valve opening period of the intake valve 9 as described above and decreases the valve opening period of the exhaust valve 10 as described above before the fuel injection is stopped due to the engine stop request. Execute the process. Therefore, the load acting on the intake lift amount varying mechanism 14i can be reduced as compared with the case where similar processing is executed after the engine operation is stopped.
- the internal combustion engine 1 is an engine that is automatically stopped and automatically started, and the control device 26 opens the intake valve 9 before stopping fuel injection when there is an automatic stop request as the engine stop request.
- a process of increasing the period as described above and decreasing the valve opening period of the exhaust valve 10 as described above is executed. Therefore, the occurrence of abnormal combustion can be appropriately suppressed in the internal combustion engine 1 where the possibility of occurrence of abnormal combustion may increase.
- the control device 26 increases the valve opening period of the exhaust valve 10 more than the valve opening period of the exhaust valve 10 decreased by the above processing. Therefore, the startability of the engine is improved as compared with the case where the opening period of the exhaust valve 10 reduced before the fuel injection is stopped is maintained even after the fuel injection is stopped.
- step S130 and step S150 shown in FIG. 8 ignition and fuel injection are stopped. However, ignition may be stopped after fuel injection is stopped. That is, the ignition and fuel injection stop timings may be varied.
- step S160 shown in Fig. 8 may be omitted. Even in this case, the effects described in the above (1) to (4) can be obtained.
- the series of processes shown in FIG. 8 was executed when there was an automatic engine stop request.
- the engine stop request includes, for example, a manual stop request by turning off the IG switch 37 in addition to the automatic stop request.
- a series of processes relating to the setting of the valve opening period described above may be executed when there is a manual stop request.
- the valve opening period setting process in this modification can be executed, for example, by changing a part of the setting process shown in FIG.
- step S100 shown in FIG. 8 is omitted.
- step S110 shown in FIG. 8 the process of step S200 and step S210 is performed as shown in FIG. That is, the control device 26 first determines whether or not the IG switch 37 is turned off (S200). When the IG switch 37 is not turned off (S200: NO), the control device 26 once ends this process.
- the control device 26 determines whether or not the current operation state is an idle operation (S210).
- the idle operation is not being performed (S210: NO)
- the IG switch 37 is turned off when the operation state is different from the idle operation, and there is a manual stop request when the operation state is different from the normal operation state. Therefore, in order to stop the engine operation promptly, the control device 26 stops the ignition and the fuel injection (S130), and once ends this process.
- control device 26 executes the processing after step S110 described above, similarly to the setting processing shown in FIG. Even in such a modification, effects other than the above (4) can be obtained.
- step S210 may be omitted, and if an affirmative determination is made in step S200, the process after step S110 may be performed next.
- valve opening period of the intake valve 9 when the valve opening period of the intake valve 9 is increased in order to suppress a decrease in the energy efficiency of the engine while suppressing an increase in the valve overlap amount when the valve opening period of the intake valve 9 is increased.
- the valve opening period of the exhaust valve 10 is reduced.
- the change of the valve opening period and the change of the valve timing may be performed together.
- the intake valve opening period INCAM may be increased, the exhaust valve opening period EXCAM may be decreased, and the exhaust valve timing EXVT may be advanced.
- the intake valve opening period INCAM may be increased, the intake valve timing INVT may be retarded, and the exhaust valve opening period EXCAM may be decreased.
- the intake valve opening period INCAM may be increased, the intake valve timing INVT may be retarded, the exhaust valve opening period EXCAM may be decreased, and the exhaust valve timing EXVT may be advanced.
- the intake valve opening period INCAM is set to the second intake period INCAM2, and the exhaust valve opening period EXCAM is set to the second exhaust period EXCAM2. I did it.
- the intake valve opening period INCAM after the engine is actually stopped or when the engine is started. May be set to the second intake period INCAM2, and the exhaust valve opening period EXCAM may be set to the second exhaust period EXCAM2.
- the intake lift amount variable mechanism 14i and the exhaust lift amount variable mechanism 14e are mechanisms that change the maximum lift amount and the valve opening period of the valve, but the internal combustion engine 1 has a variable valve mechanism that changes only the valve opening period. Even if it is provided, the present invention can be similarly applied.
- the present invention can be similarly applied to an internal combustion engine that does not include the intake valve timing variable mechanism 13i and the exhaust valve timing variable mechanism 13e.
- throttle valve 26 ... electronic control device, 27 ... accelerator pedal, 28 ... accelerator operation amount sensor, 29 ... throttle sensor, 30 ... water temperature sensor 31 ... Oil temperature sensor, 32 ... Intake air temperature sensor, 33 ... Air flow meter, 4 ... crank position sensor, 35i ... intake cam position sensor, 35e ... exhaust cam position sensor, 36i ... induction air quantity sensor, 36e ... exhaust driving amount sensor, 37 ... ignition switch (IG switch).
- IG switch ignition switch
Abstract
Description
Claims (5)
- 吸気バルブの開弁期間を変更する第1の可変動弁機構と、
排気バルブの開弁期間を変更する第2の可変動弁機構と、
前記第1の可変動弁機構及び前記第2の可変動弁機構の駆動を制御する制御部と、を備える内燃機関の制御装置であって、
前記制御部は、前記吸気バルブの開弁期間を増大させるとともに前記排気バルブの開弁期間を減少させる処理を実行する
内燃機関の制御装置。 - 前記制御部は、前記内燃機関の温度が基準値以上に高いアイドル運転時に前記処理を実行する
請求項1に記載の内燃機関の制御装置。 - 前記制御部は、機関停止要求によって燃料噴射が停止される前に前記処理を実行する
請求項1または2に記載の内燃機関の制御装置。 - 前記内燃機関は、自動停止及び自動始動が行われるように構成され、
前記機関停止要求は、前記自動停止の要求である
請求項3に記載の内燃機関の制御装置。 - 前記制御部は、前記燃料噴射が停止された後に、前記排気バルブの開弁期間を、前記処理により減少された前記排気バルブの開弁期間よりも増大させる
請求項3または4に記載の内燃機関の制御装置。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP12887827.9A EP2915981B1 (en) | 2012-10-30 | 2012-10-30 | Control apparatus for internal combustion engine |
PCT/JP2012/078026 WO2014068670A1 (ja) | 2012-10-30 | 2012-10-30 | 内燃機関の制御装置 |
CN201280076670.0A CN104755725B (zh) | 2012-10-30 | 2012-10-30 | 内燃机的控制装置 |
US14/433,175 US9739211B2 (en) | 2012-10-30 | 2012-10-30 | Control apparatus of internal combustion engine |
JP2014515738A JP5825432B2 (ja) | 2012-10-30 | 2012-10-30 | 内燃機関の制御装置 |
IN2973DEN2015 IN2015DN02973A (ja) | 2012-10-30 | 2015-04-09 |
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PCT/JP2012/078026 WO2014068670A1 (ja) | 2012-10-30 | 2012-10-30 | 内燃機関の制御装置 |
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WO2014068670A1 true WO2014068670A1 (ja) | 2014-05-08 |
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PCT/JP2012/078026 WO2014068670A1 (ja) | 2012-10-30 | 2012-10-30 | 内燃機関の制御装置 |
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US (1) | US9739211B2 (ja) |
EP (1) | EP2915981B1 (ja) |
JP (1) | JP5825432B2 (ja) |
CN (1) | CN104755725B (ja) |
IN (1) | IN2015DN02973A (ja) |
WO (1) | WO2014068670A1 (ja) |
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JP2017166351A (ja) * | 2016-03-14 | 2017-09-21 | マツダ株式会社 | エンジンの制御装置 |
WO2018216293A1 (ja) * | 2017-05-23 | 2018-11-29 | アイシン精機株式会社 | 内燃機関の制御装置 |
JP7397990B2 (ja) | 2020-07-03 | 2023-12-13 | 株式会社アイシン | 内燃機関の停止制御装置 |
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US10634067B2 (en) | 2015-12-11 | 2020-04-28 | Hyundai Motor Company | System and method for controlling valve timing of continuous variable valve duration engine |
US10920679B2 (en) | 2015-12-11 | 2021-02-16 | Hyundai Motor Company | Method for controlling of valve timing of continuous variable valve duration engine |
US10634066B2 (en) * | 2016-03-16 | 2020-04-28 | Hyundai Motor Company | System and method for controlling valve timing of continuous variable valve duration engine |
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Also Published As
Publication number | Publication date |
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IN2015DN02973A (ja) | 2015-09-18 |
CN104755725A (zh) | 2015-07-01 |
EP2915981B1 (en) | 2017-10-04 |
US20150247467A1 (en) | 2015-09-03 |
EP2915981A4 (en) | 2015-11-11 |
EP2915981A1 (en) | 2015-09-09 |
JPWO2014068670A1 (ja) | 2016-09-08 |
CN104755725B (zh) | 2018-01-16 |
JP5825432B2 (ja) | 2015-12-02 |
US9739211B2 (en) | 2017-08-22 |
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