WO2011089694A1 - 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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- WO2011089694A1 WO2011089694A1 PCT/JP2010/050638 JP2010050638W WO2011089694A1 WO 2011089694 A1 WO2011089694 A1 WO 2011089694A1 JP 2010050638 W JP2010050638 W JP 2010050638W WO 2011089694 A1 WO2011089694 A1 WO 2011089694A1
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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
- F02D13/06—Cutting-out cylinders
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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
- F02D41/008—Controlling each cylinder individually
- F02D41/0087—Selective cylinder activation, i.e. partial cylinder 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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/047—Taking into account fuel evaporation or wall wetting
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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
- F02D41/12—Introducing corrections for particular operating conditions for deceleration
- F02D41/123—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off
- F02D41/126—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off transitional corrections at the end of the cut-off period
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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
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0005—Deactivating valves
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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
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/047—Camshafts
- F01L1/053—Camshafts overhead type
- F01L2001/0537—Double overhead camshafts [DOHC]
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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
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0005—Deactivating valves
- F01L2013/001—Deactivating cylinders
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/12—Other methods of operation
- F02B2075/125—Direct injection in the combustion chamber for spark ignition engines, i.e. not in pre-combustion chamber
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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
- F02D2041/0012—Controlling intake air for engines with variable valve actuation with selective deactivation of cylinders
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/04—Engine intake system parameters
- F02D2200/0406—Intake manifold pressure
- F02D2200/0408—Estimation of intake manifold pressure
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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
- F02D2200/08—Exhaust gas treatment apparatus parameters
- F02D2200/0802—Temperature of the exhaust gas treatment apparatus
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- the present invention relates to a control device for an internal combustion engine, and more particularly, to a control device for an internal combustion engine provided with a valve stop mechanism capable of maintaining at least an intake valve of an intake valve and an exhaust valve in a closed stop state.
- Patent Document 1 it is possible to switch between an all-cylinder operation that operates all cylinders and a cylinder-cylinder operation that stops driving some intake and exhaust valves of some cylinders and deactivates some cylinders.
- a control device for a closed cylinder engine is disclosed.
- this conventional control device the number of revolutions of the engine during the cylinder resting operation is counted, and when this count reaches a predetermined value, the operation is temporarily returned to the all cylinder operation.
- the exhaust emission at the time of returning to the all cylinder operation due to the oil increase in the idle cylinder is prevented by such control.
- the applicant has recognized the following documents including the above-mentioned documents as related to the present invention.
- the present invention has been made to solve the above-described problems, and enters the combustion chamber during valve stop control while preventing fresh air from flowing into the catalyst at the time of valve return accompanying return from fuel cut.
- An object of the present invention is to provide a control device for an internal combustion engine that can suppress the deterioration of exhaust emission caused by unburned fuel contained in the oil.
- a first invention is a control device for an internal combustion engine, A valve stop mechanism capable of changing an operation state of at least the intake valve of the intake valve and the exhaust valve between a valve operating state and a closed valve stop state; Fuel cut executing means for executing fuel cut when a predetermined execution condition is satisfied during operation of the internal combustion engine; Valve stop execution means for performing valve stop control for changing an operation state of at least the intake valve of the intake valve and the exhaust valve to the closed valve stop state when the fuel cut is performed; A fuel cut return request detecting means for detecting a return request from the fuel cut; When the return request from the fuel cut accompanied with the valve stop control is detected, when the valve stop control is executed for both the intake valve and the exhaust valve, the operating state of the exhaust valve is changed.
- Preceding fuel supply means for supplying fuel to the combustion chamber of A fuel supply amount for correcting the fuel supply amount by the preceding fuel supply means in accordance with the amount of unburned fuel contained in the oil that enters the combustion chamber from the crank chamber side during the fuel cut with the valve stop control.
- Correction means It is characterized by providing.
- the second invention is the first invention, wherein
- the fuel supply amount correction means includes estimation means for estimating the unburned fuel amount based on an integrated engine speed during the fuel cut with the valve stop control.
- the third invention is the first or second invention, wherein
- the valve stop execution means performs valve stop control to change the operation state of both the intake valve and the exhaust valve to the valve closing stop state when the fuel cut is executed
- Intake valve advance return execution means for changing the operating state of the intake valve to the valve operating state prior to the return of the exhaust valve to the valve operating state when a return request from the fuel cut is detected.
- the fuel supply amount correction means adjusts the intake manifold negative pressure when the intake valve is returned to the valve operating state according to the intake manifold negative pressure immediately before the start of the fuel cut and the execution time of the fuel cut.
- the fuel supply amount correction means corrects the fuel supply amount supplied by the preceding fuel supply means based on the intake manifold negative pressure estimated by the negative pressure estimation means.
- the valve stop execution means performs valve stop control to change the operation state of both the intake valve and the exhaust valve to the valve closing stop state when the fuel cut is executed
- the control device for the internal combustion engine is in an exhaust filling state in which the exhaust gas is filled in the combustion chamber when the operation state of the intake valve and the exhaust valve is changed to the closed valve stop state by the valve stop execution unit.
- a charging state determination unit that determines whether each of the combustion chambers is in a fresh air filling state in which fresh air is filled or not,
- the preceding fuel supply means supplies fuel to the combustion chamber only before returning the operating state of the exhaust valve to the valve operating state only for the cylinder determined to be in the fresh air filling state. It is characterized by.
- any one of the first to fourth inventions Further comprising catalyst temperature acquisition means for acquiring the temperature of the catalyst disposed in the exhaust passage of the internal combustion engine; When the temperature of the catalyst at the time of fuel supply of the fuel supply amount is higher than a predetermined value, the preceding fuel supply means has a fuel supply amount of The fuel supply amount is corrected so that the air-fuel ratio at the time of combustion with fuel becomes rich.
- the amount of unburned fuel accumulated in the combustion chamber during the fuel cut accompanied by the valve stop control is supplied by the preceding fuel supply means before the valve is returned in response to the return request from the fuel cut.
- the amount of fuel supplied by the preceding fuel supply means is corrected according to the amount of unburned fuel contained in the oil that enters the combustion chamber. Therefore, according to the present invention, it is possible to prevent deterioration of exhaust emission at the time of valve return caused by oil rising while preventing fresh air from flowing into the catalyst at the time of valve return accompanying the return from the fuel cut. Can do.
- the second invention it is possible to obtain an appropriate fuel injection amount in consideration of the amount of unburned fuel contained in the oil that enters the combustion chamber, so that combustion at the time of valve return can be stabilized. Further, since the correction of the fuel injection amount in consideration of the unburned fuel amount is a decrease correction, it is possible to achieve both reduction of exhaust emission when the valve is returned and reduction of the fuel injection amount.
- the fuel supply amount can be corrected after grasping the amount of air sucked into the combustion chamber based on the intake manifold negative pressure when the intake valve is returned. Combustion can be stabilized. Further, it is possible to achieve both reduction of exhaust emission when the valve is returned and reduction of the fuel injection amount.
- the fifth aspect of the invention it is possible to realize control that prioritizes suppression of catalyst deterioration when the temperature of the catalyst is high and prioritizes reduction of exhaust emission when the temperature of the catalyst is low.
- Embodiment 1 of this invention It is a figure for demonstrating the structure of the internal combustion engine of Embodiment 1 of this invention. It is a flowchart of the control routine performed in Embodiment 1 of the present invention. It is a figure showing the relationship between the amount of in-cylinder HC and the integrated engine speed during fuel cut. It is a figure showing the relationship between the intake manifold negative pressure and the execution time of fuel cut.
- FIG. 1 is a diagram for explaining a configuration of an internal combustion engine 10 according to a first embodiment of the present invention.
- the system of this embodiment includes a spark ignition type internal combustion engine (gasoline engine) 10.
- the internal combustion engine 10 is, for example, an in-line four-cylinder engine having four cylinders # 1 to # 4.
- a piston 12 In the cylinder of the internal combustion engine 10, a piston 12 is provided. In the cylinder of the internal combustion engine 10, a combustion chamber 14 is formed on the top side of the piston 12, and a crank chamber 16 is formed on the lower side of the piston 12. An intake passage 18 and an exhaust passage 20 communicate with the combustion chamber 14.
- an air flow meter 22 that outputs a signal corresponding to the flow rate of air sucked into the intake passage 18 is provided.
- a throttle valve 24 is provided downstream of the air flow meter 22.
- the throttle valve 24 is an electronically controlled throttle valve that can control the throttle opening independently of the accelerator opening.
- the cylinder head provided in the internal combustion engine 10 is provided with an in-cylinder fuel injection valve 26 for directly injecting fuel into the combustion chamber 14 (in-cylinder).
- a spark plug 28 is attached to the cylinder head of the internal combustion engine 10 so as to protrude from the top of the combustion chamber 14 into the combustion chamber 14.
- the intake port and the exhaust port are respectively provided with an intake valve 30 and an exhaust valve 32 for bringing the combustion chamber 14 and the intake passage 18 or the combustion chamber 14 and the exhaust passage 20 into a conductive state or a cut-off state.
- the intake valve 30 and the exhaust valve 32 are driven by an intake variable valve operating device 34 and an exhaust variable valve operating device 36, respectively.
- the intake variable valve operating device 34 has a valve stop mechanism capable of changing the operation state of the intake valve 30 in units of cylinders between the valve operating state and the valve closed stop state.
- the exhaust variable valve operating device 36 is The valve stop mechanism can change the operation state of the exhaust valve 32 in units of cylinders between the valve operation state and the valve closed stop state.
- valve stop control the control for switching the operation state of the intake valve 30 and the exhaust valve 32 from the valve operation state to the valve closing stop state.
- valve stop mechanism may be realized by using an electromagnetically driven valve, or transmits the acting force of the cam to the valve.
- movement of a rocker arm may be implement
- a catalyst 38 for purifying exhaust gas is disposed in the exhaust passage 20.
- the system shown in FIG. 1 includes an ECU (Electronic Control Unit) 40.
- the ECU 40 inputs the internal combustion engine 10 such as a crank angle sensor 42 for detecting the engine speed and an intake pressure sensor 44 for detecting the intake pressure (intake manifold pressure).
- Various sensors for detecting the driving state are connected.
- the various actuators described above are connected to the output of the ECU 40.
- the ECU 40 can control the operating state of the internal combustion engine 10 based on the sensor outputs.
- fuel is supplied to the combustion chamber 14 before returning the operating state of the exhaust valve 32 to the valve operating state when a return request from the fuel cut accompanied with the valve stop control is detected. More specifically, when the return request is detected, first, the intake valve 30 is first opened to introduce fresh air into the combustion chamber 14, and the minimum combustible injection amount (combustible minimum injection amount) is set. The fuel was injected into the combustion chamber 14. In addition, the exhaust valve 32 is returned after combustion at the minimum combustible injection amount.
- the above-described minimum combustible injection amount is determined based on the amount of unburned fuel contained in the oil that enters the combustion chamber 14 side from the crank chamber 16 side during fuel cut with valve stop control of the intake and exhaust valves 30 and 32. (Hereinafter, it may be referred to as “in-cylinder HC amount”).
- the in-cylinder HC amount contained in the oil entering the combustion chamber 14 is estimated based on the accumulated engine speed during fuel cut with valve stop control. Furthermore, in this embodiment, the intake manifold negative pressure at the time of return of the intake valve is estimated according to the intake manifold negative pressure immediately before the start of the fuel cut and the execution time of the fuel cut, and then the estimated intake valve return The minimum combustible injection amount is corrected based on the intake manifold negative pressure at the time.
- each of the cylinders in which the intake and exhaust valves 30 and 32 are closed when the fuel cut is performed is in an exhaust filling state in which the combustion chamber 14 is filled with exhaust gas, Alternatively, whether or not the combustion chamber 14 is filled with fresh air is determined for each cylinder. And only with respect to the cylinder determined to be in the fresh air filling state, before the operation state of the exhaust valve 32 is returned to the valve operating state, the combustion with the fuel with the minimum combustible injection amount is executed.
- the catalyst 38 when the temperature of the catalyst 38 is higher than the predetermined value A when the operating state of the exhaust valve 32 is returned to the valve operating state (when the fuel with the minimum combustible injection amount is supplied), the catalyst Compared to the case where the temperature of 38 is equal to or lower than the predetermined value A, the variable minimum injection amount is further corrected so that the air-fuel ratio at the time of combustion after the initial explosion with the fuel having the minimum combustible injection amount becomes rich. I made it.
- FIG. 2 is a flowchart showing a control routine executed by the ECU 40 in order to realize the above function. Note that the routine shown in FIG. 2 is started when a fuel cut execution request is detected.
- valve stop control is executed to change the operation states of the intake valve 30 and the exhaust valve 32 in all cylinders to the closed valve stop state (step 100). Further, in this step 100, each cylinder in which the intake and exhaust valves 30 and 32 are closed is in an exhaust filling state in which the exhaust gas is filled in the combustion chamber 14, or a new one is introduced into the combustion chamber 14. It is determined for each cylinder whether it is in a fresh air filling state filled with air, and the determination result is stored. The valve stop control is started in all cylinders immediately upon receiving a fuel cut execution request.
- each cylinder is a fresh air filled cylinder or an exhaust filled cylinder. For example, a cylinder that is in a closed valve stop state at the end of the intake stroke is determined to be in a fresh air filling state, and a cylinder that is in a closed valve stop state at the end of the expansion stroke is determined to be in an exhaust normal state. Is done.
- step 102 it is determined whether or not there is a fuel cut stop request (return request from fuel cut) (step 104).
- step 106 the execution time of the current fuel cut by the counter and the counting of the accumulated engine speed during the fuel cut are each stopped (step 106).
- step 108 a process of returning the operating state of the intake valve 30 of each cylinder to the valve operating state is executed (step 108).
- FIG. 3 is a graph showing the relationship between the in-cylinder HC amount and the accumulated engine speed during fuel cut.
- the amount of oil that is swept into the combustion chamber 14 during execution of fuel cut with valve stop control (the amount of oil rise) increases in the combustion chamber 14 as the integrated engine speed increases during fuel cut. Increased because the extended period becomes longer. Accordingly, as shown in FIG. 3, the in-cylinder HC amount contained in the oil scooped up in the combustion chamber 14 also increases in accordance with the integrated engine speed during fuel cut.
- the ECU 40 stores the relationship as shown in FIG. 3 in a map, and in this step 110, referring to such a map, the in-cylinder HC amount is determined based on the integrated engine speed during fuel cut. Calculated.
- FIG. 4 is a graph showing the relationship between intake manifold negative pressure and fuel cut execution time. As shown in FIG. 4, the intake manifold negative pressure approaches the atmospheric pressure as the fuel cut execution time accompanied by the valve stop control becomes longer.
- the ECU 40 has a map in which the intake manifold negative pressure when the intake valve 30 is returned is determined based on the relationship between the intake manifold negative pressure just before the start of the fuel cut and the fuel cut execution time. (Not shown) is stored.
- the intake manifold negative pressure when the intake valve is restored is calculated with reference to such a map (step 112).
- a minimum injection amount combustible in a state where fresh air is introduced in accordance with the return of the intake valve 30 of each cylinder in step 108 (hereinafter referred to as “minimum combustible injection amount”) is calculated (step). 114).
- step 114 based on the in-cylinder HC amount calculated in steps 110 and 112 and the intake manifold negative pressure when the intake valve is restored, the in-cylinder HC amount is placed in the combustion chamber 14 during fuel cut.
- the combustible minimum injection amount is calculated so that the air-fuel ratio of the gas burned under the condition where the air is accumulated becomes the stoichiometric air-fuel ratio (or the air-fuel ratio leaner than the stoichiometric air-fuel ratio). More specifically, the combustible minimum injection amount is calculated as a value that is reduced more as the in-cylinder HC amount accumulated in the combustion chamber 14 during the fuel cut is larger.
- the said combustible minimum injection amount is correct
- the minimum combustible injection amount is corrected so that the air-fuel ratio at the time of combustion when the air is sucked into the combustion chamber 14 becomes the stoichiometric air-fuel ratio (or an air-fuel ratio leaner than the stoichiometric air-fuel ratio).
- a map (not shown) that defines the estimated value in relation to the intake manifold negative pressure and the like when the intake valve is restored. Can be calculated.
- the predetermined value A in this step 116 is a value set in advance as a threshold for determining whether or not the deterioration of the catalyst 38 is a concern due to the inflow of fresh air into the catalyst 38.
- the temperature of the catalyst 38 can be estimated based on, for example, the operation history of the internal combustion engine 10, or may be acquired by a temperature sensor.
- step 116 If it is determined in step 116 that the temperature of the catalyst 38 is equal to or lower than the predetermined value A, that is, if it can be determined that there is no concern about deterioration of the catalyst 38, further correction of the minimum combustible injection amount is performed. Is not executed. On the other hand, if it is determined in step 116 that the temperature of the catalyst 38 is higher than the predetermined value A, that is, if it can be determined that the catalyst 38 is in a state of concern, the minimum combustible injection amount is used.
- the temperature of the catalyst 38 is not more than the predetermined value A (that is, when the minimum combustible injection amount is calculated so as to obtain the theoretical air-fuel ratio). Further correction of the combustible minimum injection amount is executed so as to be richer than (step 118).
- step 120 fuel injection and ignition using the minimum combustible injection amount calculated as described above are executed only in the cylinder determined to be in the fresh air filling state in step 100 (step 120). Note that the fuel injection and ignition in this step 120 are not executed for the cylinder determined to be in the exhaust filling state.
- Step 122 a process of returning the operation state of the exhaust valve 32 of each cylinder to the valve operating state is executed.
- the intake valve 30 is opened first and fresh air is introduced into the combustion chamber 14.
- the minimum combustible amount of fuel is injected into the combustion chamber 14.
- a process for returning the exhaust valve 32 after the combustion at the combustible minimum injection amount is executed. Further, the minimum combustible injection amount is corrected in accordance with the in-cylinder HC amount contained in the oil that enters the combustion chamber 14 from the crank chamber 16 side during fuel cut with valve stop control of the intake and exhaust valves 30 and 32.
- the in-cylinder HC accumulated in the combustion chamber 14 during the fuel cut is burned together with the fuel having the minimum combustible injection amount, and the valve return of the intake and exhaust valves 30 and 32 can be completed.
- the valve return of the intake and exhaust valves 30 and 32 can be completed.
- the in-cylinder HC amount contained in the oil entering the combustion chamber 14 is estimated based on the integrated engine speed during fuel cut with valve stop control. As a result, an appropriate fuel injection amount in consideration of the in-cylinder HC amount can be obtained, so that combustion at the time of valve return can be stabilized. Further, since the correction of the fuel injection amount in consideration of the in-cylinder HC amount is a decrease correction, it is possible to achieve both a reduction in exhaust emission and a reduction in the fuel injection amount when the valve is returned.
- the intake manifold negative pressure at the time of return of the intake valve is estimated according to the intake manifold negative pressure immediately before the start of the fuel cut and the execution time of the fuel cut, and then the estimated intake air
- the combustible minimum injection amount is corrected based on the manifold negative pressure.
- combustion with the fuel having the minimum combustible injection amount is executed before returning the exhaust valve 32 only to the cylinder determined to be in the fresh air filling state.
- combustion with the fuel having the minimum combustible injection amount is executed before returning the exhaust valve 32 only to the cylinder determined to be in the fresh air filling state.
- the temperature of the catalyst 38 when the exhaust valve 32 is returned is higher than the predetermined value A
- the temperature of the catalyst 38 is higher than that when the temperature is lower than the predetermined value A.
- the variable minimum injection amount is further corrected so that the air-fuel ratio at the time of combustion after the initial explosion with the fuel having the minimum combustible injection amount becomes rich.
- Embodiment 1 when the return request
- the method of supplying fuel to the combustion chamber before returning the operating state of the exhaust valve to the valve operating state is It is not limited.
- the in-cylinder fuel injection valve 26 injects the minimum injection amount so that the vicinity of the spark plug 28 becomes a combustible atmosphere. May be. Then, after performing stratified combustion under a lean air-fuel ratio in the vicinity of the spark plug 28 with such a minimum injection amount, the intake valve 30 and the exhaust valve 32 may be returned to the valve operating state.
- the in-cylinder HC amount contained in the oil entering the combustion chamber 14 is estimated based on the integrated engine speed during fuel cut with valve stop control. .
- the present invention is not limited to this.
- the amount of unburned fuel contained in the oil entering the combustion chamber 14 is estimated based on the execution time of fuel cut with valve stop control. May be.
- the valve stop control is executed for both the intake valve 30 and the exhaust valve 32. It is not limited to this. That is, when the valve stop control is executed only for the intake valve 30, the gas goes back and forth between the combustion chamber 14 and the exhaust manifold, and the return of the intake valve 30 is performed from that state. Then, the flow of gas from the intake side to the exhaust side through the combustion chamber 14 is resumed. Further, even when the valve stop control is executed only on the intake valve 30 as described above, the inside of the combustion chamber 14 is in a negative pressure state in the intake stroke and the expansion stroke, and the unburned fuel contained in the oil is removed from the crank chamber. It enters from the 16 side to the combustion chamber 14 side. Therefore, when the fuel cut execution request is detected, the control of the present invention is applied to the configuration in which only the operation state of the intake valve is changed to the closed valve stop state and the valve stop control is executed. Also good.
- the fuel cut accompanied with the valve stop control for all cylinders has been described as an example.
- the present invention is not limited to this, and can also be applied to the partial cylinder deactivation operation with valve stop control for some cylinders.
- the spark ignition type internal combustion engine (gasoline engine) 10 is taken as an example.
- the internal combustion engine that is the subject of the present invention is not limited to this, and may be, for example, a compression ignition type internal combustion engine such as a diesel engine.
- the in-cylinder fuel injection valve 26 that directly injects fuel into the combustion chamber 14 when used to detect the return request from the fuel cut with the valve stop control, the exhaust gas is discharged.
- the fuel is supplied to the combustion chamber 14 before the operation state of the valve 32 is returned to the valve operation state.
- the fuel injection valve in the present invention is not limited to one that directly injects fuel into the combustion chamber 14. That is, the fuel injection valve (not shown) may be provided in the intake port, and the fuel injected into the intake port using the fuel injection valve may be supplied into the combustion chamber 14.
- the valve stop mechanism provided in the intake variable valve operating device 34 and the exhaust variable valve operating device 36 corresponds to the “valve stop mechanism” in the first invention, and the ECU 40
- the fuel injection by the in-cylinder fuel injection valve 26 is stopped so that the “fuel cut execution means” executes the processing of the above step 100 to thereby execute the “valve” in the first invention.
- the “stop execution means” executes the processing of step 104 above
- the “fuel cut return request detection means” in the first invention executes the processing of step 120 above.
- the “fuel supply means” executes the processing of steps 110 to 118 described above, whereby “fuel supply amount correction "It has been realized, respectively.
- the “intake valve advance return executing means” in the third aspect of the invention executes the process of step 112 of “negative pressure” in the third aspect of the invention.
- Each “estimating means” is realized.
- the ECU 40 executes the processing of step 100, thereby realizing the “filling state determining means” according to the fourth aspect of the present invention.
- the “catalyst temperature acquisition means” according to the fifth aspect of the present invention is realized by the ECU 40 executing the process of step 116.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Description
尚、出願人は、本発明に関連するものとして、上記の文献を含めて、以下に記載する文献を認識している。
吸気弁および排気弁のうちの少なくとも前記吸気弁の動作状態を弁稼動状態と閉弁停止状態との間で変更可能な弁停止機構と、
内燃機関の運転中に、所定の実行条件が成立した場合にフューエルカットを実行するフューエルカット実行手段と、
前記フューエルカットの実行時に、前記吸気弁および前記排気弁のうちの少なくとも前記吸気弁の動作状態を前記閉弁停止状態に変更する弁停止制御を行う弁停止実行手段と、
前記フューエルカットからの復帰要求を検知するフューエルカット復帰要求検知手段と、
前記弁停止制御を伴う前記フューエルカットからの復帰要求が検知された場合において、前記吸気弁および前記排気弁の双方に対して上記弁停止制御が実行される場合には前記排気弁の動作状態を前記弁稼動状態に復帰させる前に、または、前記吸気弁のみに対して上記弁停止制御が実行される場合には前記吸気弁の動作状態を前記弁稼動状態に復帰させる前に、前記内燃機関の燃焼室に燃料を供給する先行燃料供給手段と、
前記先行燃料供給手段による燃料供給量を、前記弁停止制御を伴う前記フューエルカット中に、クランク室側から前記燃焼室内に浸入するオイルに含まれる未燃燃料の量に応じて補正する燃料供給量補正手段と、
を備えることを特徴とする。
前記燃料供給量補正手段は、前記弁停止制御を伴う前記フューエルカット中の積算エンジン回転数に基づいて、前記未燃燃料量を推定する推定手段を含むことを特徴とする。
前記弁停止実行手段は、前記フューエルカットの実行時に、前記吸気弁および前記排気弁の双方の動作状態を前記閉弁停止状態に変更する弁停止制御を行うものであって、
前記フューエルカットからの復帰要求が検知された場合に、前記弁稼働状態への前記排気弁の復帰に先立って、前記吸気弁の動作状態を前記弁稼働状態に変更する吸気弁先行復帰実行手段を更に備え、
前記燃料供給量補正手段は、前記フューエルカットの実行開始直前の吸気マニホールド負圧と当該フューエルカットの実行時間とに応じて、前記弁稼動状態への前記吸気弁の復帰時の吸気マニホールド負圧を推定する負圧推定手段を含み、
前記燃料供給量補正手段は、前記負圧推定手段により推定された吸気マニホールド負圧に基づいて、前記先行燃料供給手段により供給される前記燃料供給量を補正することを特徴とする。
前記弁停止実行手段は、前記フューエルカットの実行時に、前記吸気弁および前記排気弁の双方の動作状態を前記閉弁停止状態に変更する弁停止制御を行うものであって、
前記内燃機関の制御装置は、前記弁停止実行手段により前記吸気弁および前記排気弁の動作状態が前記閉弁停止状態に変更された時に、前記燃焼室内に排気ガスが充填された排気充填状態であるか、或いは前記燃焼室内に新気が充填された新気充填状態であるかを気筒別に判定する充填状態判定手段を更に備え、
前記先行燃料供給手段は、前記新気充填状態であると判定された気筒に対してのみ、前記排気弁の動作状態を前記弁稼働状態に復帰させる前に、前記燃焼室に燃料を供給することを特徴とする。
前記内燃機関の排気通路に配置される触媒の温度を取得する触媒温度取得手段を更に備え、
前記先行燃料供給手段は、前記燃料供給量の燃料供給時の前記触媒の温度が所定値よりも高い場合には、当該触媒の温度が前記所定値以下である場合と比べ、前記燃料供給量の燃料での燃焼時の空燃比がリッチとなるように、当該燃料供給量を補正することを特徴とする。
14 燃焼室
16 クランク室
18 吸気通路
20 排気通路
26 筒内燃料噴射弁
28 点火プラグ
30 吸気弁
32 排気弁
34 吸気可変動弁装置
36 排気可変動弁装置
38 触媒
40 ECU(Electronic Control Unit)
42 クランク角センサ
44 吸気圧力センサ
[システム構成の説明]
図1は、本発明の実施の形態1の内燃機関10の構成を説明するための図である。本実施形態のシステムは、火花点火式の内燃機関(ガソリンエンジン)10を備えている。本実施形態では、内燃機関10は、一例として、#1~#4の4つの気筒を有する直列4気筒型エンジンであるものとする。
排気通路20に配置される触媒38が高温状態にある場合に、酸素濃度の高い新気が触媒38に供給されると、触媒38に劣化が生ずることが懸念される。上述した可変動弁装置34、36を備える本実施形態のシステムによれば、減速時等においてフューエルカットの実行要求が出された場合に、吸気弁30および排気弁32の動作状態をそれぞれ閉弁停止状態とすることで、フューエルカット中に触媒38に新気が流入するのを防止することができる。
また、ECU40が、上記ステップ108の処理を実行することにより前記第3の発明における「吸気弁先行復帰実行手段」が、上記ステップ112の処理を実行することにより前記第3の発明における「負圧推定手段」が、それぞれ実現されている。
また、ECU40が上記ステップ100の処理を実行することにより、前記第4の発明における「充填状態判定手段」が実現されている。
また、ECU40が上記ステップ116の処理を実行することにより、前記第5の発明における「触媒温度取得手段」が実現されている。
Claims (5)
- 吸気弁および排気弁のうちの少なくとも前記吸気弁の動作状態を弁稼動状態と閉弁停止状態との間で変更可能な弁停止機構と、
内燃機関の運転中に、所定の実行条件が成立した場合にフューエルカットを実行するフューエルカット実行手段と、
前記フューエルカットの実行時に、前記吸気弁および前記排気弁のうちの少なくとも前記吸気弁の動作状態を前記閉弁停止状態に変更する弁停止制御を行う弁停止実行手段と、
前記フューエルカットからの復帰要求を検知するフューエルカット復帰要求検知手段と、
前記弁停止制御を伴う前記フューエルカットからの復帰要求が検知された場合において、前記吸気弁および前記排気弁の双方に対して上記弁停止制御が実行される場合には前記排気弁の動作状態を前記弁稼動状態に復帰させる前に、または、前記吸気弁のみに対して上記弁停止制御が実行される場合には前記吸気弁の動作状態を前記弁稼動状態に復帰させる前に、前記内燃機関の燃焼室に燃料を供給する先行燃料供給手段と、
前記先行燃料供給手段による燃料供給量を、前記弁停止制御を伴う前記フューエルカット中に、クランク室側から前記燃焼室内に浸入するオイルに含まれる未燃燃料の量に応じて補正する燃料供給量補正手段と、
を備えることを特徴とする内燃機関の制御装置。 - 前記燃料供給量補正手段は、前記弁停止制御を伴う前記フューエルカット中の積算エンジン回転数に基づいて、前記未燃燃料量を推定する推定手段を含むことを特徴とする請求項1に記載の内燃機関の制御装置。
- 前記弁停止実行手段は、前記フューエルカットの実行時に、前記吸気弁および前記排気弁の双方の動作状態を前記閉弁停止状態に変更する弁停止制御を行うものであって、
前記フューエルカットからの復帰要求が検知された場合に、前記弁稼働状態への前記排気弁の復帰に先立って、前記吸気弁の動作状態を前記弁稼働状態に変更する吸気弁先行復帰実行手段を更に備え、
前記燃料供給量補正手段は、前記フューエルカットの実行開始直前の吸気マニホールド負圧と当該フューエルカットの実行時間とに応じて、前記弁稼動状態への前記吸気弁の復帰時の吸気マニホールド負圧を推定する負圧推定手段を含み、
前記燃料供給量補正手段は、前記負圧推定手段により推定された吸気マニホールド負圧に基づいて、前記先行燃料供給手段により供給される前記燃料供給量を補正することを特徴とする請求項1または2に記載の内燃機関の制御装置。 - 前記弁停止実行手段は、前記フューエルカットの実行時に、前記吸気弁および前記排気弁の双方の動作状態を前記閉弁停止状態に変更する弁停止制御を行うものであって、
前記内燃機関の制御装置は、前記弁停止実行手段により前記吸気弁および前記排気弁の動作状態が前記閉弁停止状態に変更された時に、前記燃焼室内に排気ガスが充填された排気充填状態であるか、或いは前記燃焼室内に新気が充填された新気充填状態であるかを気筒別に判定する充填状態判定手段を更に備え、
前記先行燃料供給手段は、前記新気充填状態であると判定された気筒に対してのみ、前記排気弁の動作状態を前記弁稼働状態に復帰させる前に、前記燃焼室に燃料を供給することを特徴とする請求項1乃至3の何れか1項記載の内燃機関の制御装置。 - 前記内燃機関の排気通路に配置される触媒の温度を取得する触媒温度取得手段を更に備え、
前記先行燃料供給手段は、前記燃料供給量の燃料供給時の前記触媒の温度が所定値よりも高い場合には、当該触媒の温度が前記所定値以下である場合と比べ、前記燃料供給量の燃料での燃焼時の空燃比がリッチとなるように、当該燃料供給量を補正することを特徴とする請求項1乃至4の何れか1項に記載の内燃機関の制御装置。
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CN103670732A (zh) * | 2012-09-10 | 2014-03-26 | 通用汽车环球科技运作有限责任公司 | 用于气缸起用和停用控制系统的进气端口压力预测 |
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EP3015683B1 (en) * | 2013-06-26 | 2017-10-11 | Toyota Jidosha Kabushiki Kaisha | Controller for variable valve mechanism |
CN107288771A (zh) * | 2016-03-30 | 2017-10-24 | 联合汽车电子有限公司 | 发动机喷油控制系统及方法 |
JP6477638B2 (ja) * | 2016-09-14 | 2019-03-06 | トヨタ自動車株式会社 | 熱、水素生成装置 |
JP6939472B2 (ja) * | 2017-11-27 | 2021-09-22 | トヨタ自動車株式会社 | 内燃機関の制御装置 |
JP2021076029A (ja) | 2019-11-05 | 2021-05-20 | 三菱重工エンジン&ターボチャージャ株式会社 | ガスエンジンの再着火処理装置、再着火方法およびプログラム |
US20230243315A1 (en) * | 2023-03-17 | 2023-08-03 | Michael J. Holihan | Method to mitigate reverse oil flow to the combustion chamber via hybrid cylinder cutout for internal combustion engines |
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