CN101341324A - Control apparatus for an internal combustion engine and method for controlling the same - Google Patents
Control apparatus for an internal combustion engine and method for controlling the same Download PDFInfo
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- CN101341324A CN101341324A CNA2007800008124A CN200780000812A CN101341324A CN 101341324 A CN101341324 A CN 101341324A CN A2007800008124 A CNA2007800008124 A CN A2007800008124A CN 200780000812 A CN200780000812 A CN 200780000812A CN 101341324 A CN101341324 A CN 101341324A
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 159
- 238000000034 method Methods 0.000 title claims description 58
- 230000006835 compression Effects 0.000 claims abstract description 78
- 238000007906 compression Methods 0.000 claims abstract description 78
- 239000000446 fuel Substances 0.000 claims description 73
- 239000002826 coolant Substances 0.000 claims description 53
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 45
- 230000008569 process Effects 0.000 claims description 43
- 238000005086 pumping Methods 0.000 claims description 23
- 230000009467 reduction Effects 0.000 claims description 21
- 230000008859 change Effects 0.000 claims description 13
- 239000000110 cooling liquid Substances 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 7
- 238000011084 recovery Methods 0.000 claims description 6
- 238000010304 firing Methods 0.000 description 49
- 230000000630 rising effect Effects 0.000 description 18
- 230000007246 mechanism Effects 0.000 description 11
- 238000005474 detonation Methods 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 7
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- 230000004044 response Effects 0.000 description 6
- 230000002159 abnormal effect Effects 0.000 description 5
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 239000012141 concentrate Substances 0.000 description 4
- 239000000498 cooling water Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 150000001298 alcohols Chemical class 0.000 description 2
- 238000000889 atomisation Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
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- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
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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
- 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
- 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
- F01L1/36—Valve-gear or valve arrangements, e.g. lift-valve gear peculiar to machines or engines of specific type other than four-stroke cycle
-
- 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
- F02D13/0273—Multiple actuations of a valve within an engine 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
- 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
- F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
- F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
- F02D41/064—Introducing corrections for particular operating conditions for engine starting or warming up for starting at cold start
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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
- F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
- F02D41/068—Introducing corrections for particular operating conditions for engine starting or warming up for warming-up
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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
- F02D41/3011—Controlling fuel injection according to or using specific or several modes of combustion
- F02D41/3017—Controlling fuel injection according to or using specific or several modes of combustion characterised by the mode(s) being used
- F02D41/3058—Controlling fuel injection according to or using specific or several modes of combustion characterised by the mode(s) being used the engine working with a variable number of cycles
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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
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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
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
- F02D19/08—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed simultaneously using pluralities of fuels
- F02D19/082—Premixed fuels, i.e. emulsions or blends
- F02D19/084—Blends of gasoline and alcohols, e.g. E85
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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
-
- 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
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0611—Fuel type, fuel composition or fuel quality
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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
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
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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
-
- 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
- Y02T10/30—Use of alternative fuels, e.g. biofuels
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Electrical Control Of Ignition Timing (AREA)
Abstract
In a control apparatus for an internal combustion engine having a valve timing control means controlling the timing opening and closing of an intake valve disposed in an intake port communicating with a cylinder of the internal combustion engine, when the internal combustion engine is being started from a cold condition, multi-stroke operation is set, in which one combustion cycle of the internal combustion engine includes two or more intake and compression strokes, formed by a first intake stroke and the first compression stroke and a second intake stroke and compression stroke, followed by a combustion stroke and an exhaust stroke. The valve timing control means controls a lift of the intake valve during the first intake stroke and the first compression stroke to a low lift amount, which is smaller than the normal lift amount required for intake of a requested intake air amount, and controls the lift of the intake valve in a second intake and a second compression stroke to the normal lift amount.
Description
Technical field
[0001] the present invention relates to the method that is used for the control apparatus of internal-combustion engine and is used for controlling combustion engine.More particularly, it relates to opening and closing timing and the control apparatus that is used for internal-combustion engine of lift amount and the method that is used for controlling combustion engine of independent intake valve that can controlling combustion engine.
Background technique
[0002] publication number be JP-A-10-252511 Japanese Patent Application Publication a kind of system, it controls the opening and closing of intake valve and exhaust valve by the valve actuating mechanism that can adjust the opening and closing timing of intake valve in each cylinder that is located at internal-combustion engine and exhaust valve changeably.In this system, in the combustion stablized course of normal operation in internal-combustion engine, described internal-combustion engine is to comprise the four-journey burning cycle operation of intake stroke, compression stroke, expansion stroke and exhaust stroke.With this, control be performed in case in described intake stroke at the described intake valve of predetermined timing opening and closing, and control be performed in case in described exhaust stroke at the described exhaust valve of predetermined timing opening and closing.
[0003] yet, for example, under the situation that unburnt internal-combustion engine cold-starting might take place, have non-complete combustion of fuel and the unburned fuel of in described exhaust stroke, discharging from the described cylinder situation under remaining.Therefore, in said system, in described internal-combustion engine, just taking place under the unburnt situation, carrying out control subsequently in judgement.Especially, in the running of described internal-combustion engine, the unlatching of intake valve and exhaust valve is stopped to reach the scheduled time.As a result, in the time that described valve is stopped, described intake valve and described exhaust valve all are closed, and moving up and down of piston only repeats described compression stroke and described expansion stroke.Under this condition, between described compression stroke and described expansion stroke, light a fire at every turn.
[0004] like this, in the process that described compression stroke and outburst/expansion stroke so repeat, the unburned fuel in the cylinder is by perfect combustion.Subsequently, when confirming described unburned fuel perfect combustion, allow normal valve opening or closing operation and enabling once more.With this, might take place under the unburnt operational condition, described system can realize fuel combustion completely and suppress the discharge of unburned fuel.
[0005] in the time that internal-combustion engine is just started from the cryogenic conditions of described internal-combustion engine, for smooth combustion with improve starting characteristic, increases fuel injection amount to reach the dense condition of fuel by carrying out control.Yet, from improving the position of oil consumption rate and toxic emission, even wish in described cold-starting process, also further to enlarge the lean-limit of internal-combustion engine.About this point, when partial combustion took place, said system was carried out the compression and the expansion stroke that repeat under intake valve and all pent situation of exhaust valve, and each execution igniting is so that described unburned fuel perfect combustion.Promptly, according to described system, by repeating described compression stroke and outburst/expansion stroke, the fuel of filling described cylinder of closing is by perfect combustion, and when described internal-combustion engine during by cold-starting, fuel is irrelevant with the control for the air fuel ratio of lean side in operating process, also with to enlarge described lean-limit irrelevant.
Summary of the invention
[0006] the purpose of this invention is to provide a kind of method that is used for the control apparatus of internal-combustion engine and is used for controlling combustion engine, just when cold-starting is started, also can realize the expansion of described lean-limit even described internal-combustion engine is modified when described internal-combustion engine.
[0007] first scheme of the present invention is the control apparatus that is used for internal-combustion engine, it has: be used to change the timing of opening and closing of intake valve and the variable valve actuation device of lift amount, described intake valve is arranged in the suction port that communicates with the cylinder of described internal-combustion engine; The valve timing control gear, it is used for controlling by described variable valve actuation device the described timing and the lift amount of the described opening and closing of described intake valve; The cold-starting decision maker, it is used to judge whether described internal-combustion engine just starts from cold-starting; And multiple-pass operation setting device, it is used for judging that when described cold-starting decision maker described internal-combustion engine is just when cold-starting is started, the multiple-pass operation is set, a burning cycle at internal-combustion engine described in the described multiple-pass operation comprises two above air inlets and compression stroke, wherein said multiple-pass operation is that combustion stroke and exhaust stroke are formed by first intake stroke and first compression stroke and second intake stroke and second compression stroke subsequently.In this scheme, in described first intake stroke and the described first compression stroke process, described valve timing control gear is controlled to be low lift amount with the lift of described intake valve, described low lift amount is less than the required normal lift amount of the air inlet that is used for the requirement air inflow, and in described second intake stroke and described second compression stroke, described valve timing control gear is controlled to be described normal lift amount with the described lift of described intake valve.
[0008] according to described first scheme, by carrying out twice above air inlet and compression stroke, and make the described lift amount in described first intake stroke little, just may when flowing into the firing chamber, air inlet improve described intake temperature.Therefore, even when the temperature in the described internal-combustion engine is low, in the cold-starting process, also may improve described combustion chamber temperature and smooth combustion quickly.
[0009] in alternative plan, described low lift amount can be the lift amount of pumping loss biggest place in described first intake stroke and the described first compression stroke process.
[0010] according to described alternative plan, when in described first intake stroke and described first compression stroke, carrying out air inlet, can more effectively improve the temperature of described air inlet, this not only makes combustion characteristic be improved, and makes described internal-combustion engine warming-up more early.
[0011] the 3rd embodiment is first or the control apparatus of alternative plan, it can further have igniting correct timing controller, it is used for coming the control ignition timing by the spark plug that is arranged on described cylinder, wherein forbids igniting at igniting correct timing controller described in described first intake stroke and the described first compression stroke process.
[0012] according to third party's case, except in described first intake stroke and the described first compression stroke process, effectively improving the intake temperature, can also make it possible to produce the moment that requires load required according to requiring air inflow to carry out air inlet in described second intake stroke and described second compression stroke.
[0013] cubic case be first to third party's case any one control apparatus, wherein in a burning cycle process, described multiple-pass operation setting device can make described first intake stroke and described first compression stroke rerun repeatedly, carries out described second intake stroke and described second compression stroke subsequently.
[0014] according to cubic case, intake temperature is improved more reliably and might be made described internal-combustion engine warming-up in the stage more early.
[0015] the 5th scheme is any one a control apparatus in first to fourth scheme, and it can further have the multiple-pass operation and stop decision maker, and it is used to judge whether the multiple-pass operation will be terminated; And four-journey operation setting device, judge that the multiple-pass operation will be terminated if it is used for described multiple-pass operation, a burning cycle of the burning of described internal-combustion engine is set to comprise the four-journey operation of intake stroke, compression stroke, expansion stroke and exhaust stroke.
[0016] when described internal-combustion engine is low temperature, above-mentioned multiple-pass operates in that to improve on the combustion characteristic be favourable.Yet because diminish in the lift amount of intake valve described in described first intake stroke and described first compression stroke, so intake resistance becomes greatly, the moment loss is big.Therefore, behind flameholding, can be transformed into normal four-journey operation.About this point, according to the 6th to the 9th following scheme, can judge the timing of this conversion reliably, when judging that described multiple-pass operation will be terminated, the four-journey operation be can be transformed into, normal intake stroke, compression stroke, expansion stroke and exhaust stroke carried out therein.
[0017] the 6th scheme is the control apparatus of the 5th scheme, it can further have temperature-detecting device, it is used for detecting the temperature of described cylinder, if the temperature in the wherein described cylinder reaches the threshold value temperature cylinder, then described multiple-pass operation stops decision maker and judges that the multiple-pass operation will be terminated.
[0018] the 7th scheme is the control apparatus of the 5th scheme, it may further include temperature detector, it is used to detect the temperature of the cooling liquid of described internal-combustion engine, if wherein the described temperature of described cooling liquid reaches the threshold value coolant temperature, then described multiple-pass operation stops decision maker and judges that the multiple-pass operation will be terminated.
[0019] all directions case is the control apparatus of the 5th scheme, it can further have requirement LOAD FOR device, it is used to calculate the load that requires on the described internal-combustion engine, if the load that requires that wherein calculates meets or exceeds threshold engine load, then described multiple-pass operation stops decision maker and judges that the multiple-pass operation will be terminated.
[0020] the 9th scheme is the control apparatus of the 5th scheme, it can further have the temperature cylinder prediction unit, before it is used for described first intake stroke in a burning cycle and described first compression stroke and begins, prediction is the temperature in the cylinder after carrying out described second intake stroke and described second compression stroke, if wherein the temperature in Yu Ce the described cylinder reaches threshold value prediction temperature cylinder, then described multiple-pass operation stops decision maker and judges that the multiple-pass operation will be terminated.
[0021] under the situation of above-mentioned multiple-pass operation, if repeat air inlet and compression stroke, intake temperature will excessively raise.When intake temperature excessively raises, also can predict the cause that this is an abnormal combustion.About this point, according to described the 9th scheme, the described temperature in the described cylinder is predicted, and judges whether be transformed into the operation of six strokes from the multiple-pass operation based on described predicted temperature.Therefore, even under the situation of carrying out the multiple-pass operation, can prevent more reliably that also air inlet from rising to too high temperature.
[0022] same, in the fuel of internal-combustion engine, comprise because the volatility of fuel depends on the concentration of alcohol fuel in the fuel difference being arranged under the situation of alcohol, combustion characteristic also will change.That is, even for the identical operations condition, from the starting to the time that reaches smooth combustion also with difference.
[0023] the tenth scheme is any one a control apparatus in the 6th to the 9th scheme, wherein said internal-combustion engine can use the fuel that comprises alcohol to act as a fuel, and described control apparatus can be provided with any in described threshold value temperature cylinder, described threshold value coolant temperature, described threshold engine load and the described threshold value prediction engine temperature according to the concentration of the alcohol fuel in the fuel.
[0024] according to described the tenth scheme, the decision content of described threshold value temperature cylinder, described threshold value coolant temperature, described threshold engine load or described threshold value prediction engine temperature, the concentration of alcohol fuel in judging whether according to fuel and when the multiple-pass operation is transformed into the four-journey operation with for referencial use.Therefore can carry out described conversion reliably according to the fuel that uses judges.
[0025] the 11 scheme is any one a control apparatus in first to the tenth scheme, wherein said internal-combustion engine can have first cylinder block and second cylinder block, and wherein said control apparatus can only be operated the cylinder that belongs to described first cylinder block, and can comprise reduction cylinder operation setting device, its cylinder that is used for belonging to described second cylinder block is set to reduce cylinder operation, is stopped at cylinder described in the described reduction cylinder operation; And whole cylinder operation setting devices, its cylinder that is used for all belonging to the cylinder of described first cylinder block and belonging to described second cylinder block is set to whole cylinder operation, all cylinder is operated in described whole cylinder operation, wherein when described motor is converted to whole cylinder operation from reducing cylinder operation, described cold-starting decision maker judges whether the recovery of the operation of the described cylinder that belongs to described second cylinder block is cold-starting, and when described cold-starting decision maker judge the described cylinder that belongs to described second cylinder block operation revert to described cold-starting the time, the described operation setting that described multiple-pass operation setting device will belong to the cylinder of described second cylinder block is that multiple-pass is operated.
[0026] according to described the 11 scheme, when when so-called reduction cylinder operation turns back to whole cylinder operation, even the cylinder that is stopped in reduction cylinder operation process will also can be used above-mentioned multiple-pass operation under the situation of low temperature recovery operation.Therefore can make the flameholding in the cylinder that is stopped quickly, and can turn back to whole cylinder operation from the reduction cylinder operation quickly.
[0027] the 12 scheme is any one a control apparatus in the first to the 11 scheme, wherein said variable valve actuation device can have the inlet valve cam of the described opening and closing that drive described intake valve, with the motor of the described inlet valve cam of rotation driving, wherein said valve timing control gear can drive by the described rotation of using the described inlet valve cam of described motor control control described valve timing.
[0028], because can use motor to control the valve timing of intake valve, can reliably described intake valve be controlled at the lift amount of setting, and can in above-mentioned six strokes operation, realize control reliably lift amount according to described the 12 scheme.
Description of drawings
[0029] from the reference Figure of description to the following description of preferred embodiment, the aforesaid and further target of the present invention, feature and advantage will become clearer, wherein same reference numerals is used for representing components identical, and wherein:
Fig. 1 is the schematic representation of having described according to the structure of the system of first embodiment of the present invention;
Fig. 2 has described the figure that concerns between the lift amount of intake valve and the pumping loss;
Fig. 3 A and Fig. 3 B have described the opening and closing timing of intake valve and exhaust valve and the figure of lift amount;
Fig. 4 is the flow chart of having described by the control program of the execution of the system in first embodiment according to the present invention;
Fig. 5 has described the plotted curve that concerns between coolant temperature in the present invention's second embodiment and the threshold engine load;
Fig. 6 is the flow chart of having described by the control program of the execution of the system in second embodiment of the present invention;
Fig. 7 is the flow chart of having described by the control program of the execution of the system in the 3rd embodiment of the present invention;
Fig. 8 is the plotted curve that concerns between alcohol concentration in the fuel of having described in the present invention's the 4th embodiment and the coolant temperature;
Fig. 9 is the flow chart of having described by the control program of the execution of the system in the 4th embodiment of the present invention; And
Figure 10 is the flow chart of having described by the control program of the execution of the system in the 5th embodiment of the present invention.
Embodiment
[0030] with reference to the accompanying drawings, describe the specific embodiment of the present invention in detail.In described accompanying drawing, identical with foregoing element or corresponding element is assigned with identical reference character and its description and also is simplified or omits.
[0031] Fig. 1 is the organigram that has shown first embodiment of the present invention.System among Fig. 1 has internal-combustion engine 10.Internal-combustion engine 10 has cylinder 12.Although only there is the cross section of a cylinder 12 to be presented among Fig. 1, in fact internal-combustion engine 10 has a plurality of cylinders 12.Piston 14 is arranged on cylinder 12 inside.Piston 14 is connected to bent axle 18 via connecting rod 16.The rotating speed of response bent axle and the speed probe 20 that produces output be arranged on bent axle 18 near.The cooling-water temperature transmitter 22 that detection is used for the coolant temperature of internal-combustion engine is arranged on internal-combustion engine.Firing chamber 24 is arranged on the top of piston 14.Response firing chamber 24 temperature inside and the temperature transducer 26 (temperature-detecting device) that produces output is arranged in the firing chamber 24.Spark plug 28 is inserted into and its head is exposed in the firing chamber 24.
[0032] internal-combustion engine 10 has suction port 30 and the relief opening 32 that is communicated with firing chamber 24.Be contained in the sparger 34 in the suction port 30.Suction port 30 is connected on the gas-entered passageway 36.Air flow meter 38 is arranged in the gas-entered passageway 36.
[0033] suction port 30 of each cylinder 12 of internal-combustion engine 10 has the intake valve 40 of opening and closing suction port 30.Air inlet door-hinge 42 is fixed on the intake valve 40.Valve tappet 44 is installed to the top of air inlet door-hinge 42.The propelling force of valve spring 46 affacts on the air inlet door-hinge 42, and then intake valve 40 advances on the valve-closing direction by described propelling force.Inlet valve cam 50 is arranged at the top of valve tappet 44.Each cylinder 12 inlet valve cam 50 per two be connected on the same camshaft (not shown), and be connected in the variable valve timing mechanism 52 via camshaft or analog.Cam-position sensor 54 be installed in inlet valve cam camshaft near.Cam-position sensor 54 is in response to the corner of inlet valve cam 50 and rotating speed and produce output.
[0034] internal-combustion engine 10 has the exhaust valve 60 of opening and closing relief opening 32 on the relief opening 32 of each cylinder 12.Exhaust valve 60 has and intake valve 40 identical construction.That is, exhaust valve 60 has the exhaust door-hinge 62 that is fixed to exhaust valve 60, is installed in the valve tappet 64 at exhaust door-hinge 62 tops, and is mounted to the valve spring 66 that promotes exhaust door-hinge 62 on the valve-closing direction.Exhaust cam 70 is arranged on the top of valve tappet 64.Each cylinder 12 exhaust cam 70 per two be connected on the same camshaft (not shown), and be connected to variable valve timing mechanism 72 via camshaft or analog.Cam-position sensor 74 be installed in exhaust cam 70 camshaft near.Cam-position sensor 74 is in response to the corner of exhaust cam 70 and rotating speed and produce output.
[0035] thus the variable valve timing mechanism 52 that is used for intake valve 40 sides utilizes motor with the rotating speed of control camshaft with shake the rotation of control inlet valve cam 50 and shake.As a result, the phase place of intake valve 40, operation angle and lift amount can change independently for each cylinder 12.Thereby the variable valve timing mechanism 72 that is used for exhaust valve 70 utilizes motor or analog with the rotation of control camshaft with shake the rotation of control exhaust cam 70 and shake.As a result, the phase place of exhaust valve 70, operation angle and lift amount can change independently for each cylinder 12.
[0036] by changing the phase place of intake valve and exhaust valve 40,60, can change the timing of the opening and closing of intake valve and exhaust valve 40,60.By changing operation angle, can change the period of the opening and closing of intake valve and exhaust valve 40,60.By changing lift amount, when intake valve and exhaust valve 40,60 unlatchings, can change the size of the passage that between valve and suction port and delivery outlet 30,32, forms.Can carry out this control to each intake valve 40 and the exhaust valve 60 of each independent cylinder 12.Because in order to the rotation of control camshaft and the mechanism of shaking with phase place, operation angle and the lift amount of control intake valve 40 or exhaust valve 60 is not novel especially, so will not describe in detail at this.
[0037] internal-combustion engine 10 has as the ECU (electronic control unit) 80 that is used for the control gear of internal-combustion engine.ECU 80 obtains to be used for the required information of control of internal-combustion engine 10 from the sensor as speed probe 20, cooling-water temperature transmitter 22, temperature transducer 26, Air flow meter 38 and cam- position sensor 54,74, and controls spark plug 28, sparger 34 and variable valve timing mechanism 52,72 based on the information that obtains.
[0038] for example, internal-combustion engine 10 also not by the situation of the cold-starting of warming-up under, the temperature of the various parts of internal-combustion engine 10 is low.Therefore, intake temperature is low when motor 10 cold-startings.Thereby be difficult to make fuel atomization, and mix this situation when taking place in that gas and fuel are low, be difficult to obtain stable burning.Therefore, when cold-starting, carry out control usually to improve fuel injection amount.Yet, if carried out this control, the air-fuel ratio in the cold-starting process, and the amount of the unburned fuel of discharging increases.Therefore, in order to enlarge lean-limit and to improve oil consumption rate and exhaust emission characteristics, wishing to carry out in short time interval increases the control of fuel injection amount or avoids controlling in the cold-starting process.For this reason, in cold-starting, wish that the initial stage intake temperature after internal-combustion engine 10 startings increases, promote atomizing and smooth combustion.
[0039] if the intake resistance in the intake stroke of internal-combustion engine 10 increases, frictional heat when being admitted in the cylinder 12, takes place in air inlet.Therefore, by making the intake resistance in the intake stroke, promptly pumping loss becomes big, can raise by the increase frictional heat and send into the temperature of the gas in the cylinder 12.
[0040] Fig. 2 has described the figure that concerns between the lift amount of intake valve 40 and the pumping loss.In Fig. 2, the lift amount of transverse axis representative intake valve 40, and the longitudinal axis is represented pumping loss.Solid line among Fig. 2 (i) has shown that internal-combustion engine 10 is in than the situation in the lower rotary speed area of solid line shown in (ii).As shown in Figure 2, along with the lift of intake valve 40 is that zero situation rises from lift amount, pumping loss also increases, and becomes maximum when certain lift amount (low lift amount).Along with lift amount becomes greater than described low lift amount, pumping loss reduces gradually.Pumping loss is that the described low lift amount of biggest place depends on the rotating speed of motor and difference, and as the solid line among Fig. 2 (i) with (ii), along with engine speed increases, described low lift amount trends towards increasing.
When [0041] frictional heat that produces when air inlet flows into cylinder was high more, the pumping loss in intake stroke was big more.Therefore, be set to described low lift amount and make the pumping loss maximum by lift amount, the temperature of the air inlet that when carrying out cold-starting, can raise quickly.
[0042] on the contrary, the lift amount of intake valve 40 is set to make the air of requirement to enter the required lift amount (normal lift amount) of reliable air inlet of cylinder 12.About this point,,, be necessary to introduce required air quantity, and be necessary that being controlled to be normal lift amount by the lift amount with intake valve 40 carries out air inlet in order to produce the required moment of starting even when the internal-combustion engine cold-starting.Therefore, if remain in order to improve temperature under the control of hanging down lift amount aforesaid, after having finished intake stroke, carry out compression stroke and outburst/expansion stroke, then can think and in fact be reduced the deficiency of air of filling cylinder 12 so burn.
System in [0043] first embodiment, for rising and the sufficient air inflow that when carrying out cold-starting, obtains intake temperature simultaneously, in a burning cycle of internal-combustion engine 10, after twice repeated admission stroke and the compression stroke, carry out combustion stroke and exhaust stroke.Fig. 3 A and Fig. 3 B have described the timing and the lift amount of the opening and closing of intake valve in the internal-combustion engine 10 and exhaust valve, and Fig. 3 A has shown the operation when cold-starting, and Fig. 3 B has shown the operation after the flameholding.
[0044] as shown in Fig. 3 A, when intake temperature in the cold-starting process is low, a burning cycle is made up of the six strokes operation that comprises first intake stroke, first compression stroke, second intake stroke, second compression stroke, expansion stroke and exhaust stroke, with predetermined timing once igniting takes place in second compression stroke.In this embodiment, this operational condition of internal-combustion engine 10 will be called as " operation of six strokes ".In six stroke operating process, in initial intake stroke (first intake stroke), for the intake temperature that raises under the pumping loss maximum, the lift amount of intake valve 40 is controlled as low lift amount.Relation between low lift amount and the pumping loss depends on the timing of opening and closing of intake valve and operation angle and different.Therefore, the low lift amount that is arranged on this point is: make the maximized lift amount of pumping loss under the timing and the operation angle of opening and closing is set to suitable timing and angle with respect to other operational condition condition.Intake temperature is owing to the frictional heat that produces in the first intake stroke process raises.Although the rotating speed of the motor that depends on the gas temperature of introducing and carve at that time, temperature raises also different, and temperature for example is about 50 ℃ to 60 ℃.Carry out after the air inlet under the condition of this lift amount, intake valve 40 is closed, and enters first compression stroke.
[0045] after above-mentioned steps, do not carry out igniting and just enter second intake stroke.When this took place, the lift amount of intake valve 40 was controlled as the normal lift amount that requires gas flow required.Normal lift amount depends on that the timing and the operation angle of opening and closing of intake valve 40 is also different.Therefore, under the situation that lift amount, opening and closing timing and operation angle suitably are provided with, normal lift amount is set to introduce the lift amount that requires gas flow required.Valve timing is set by this way, and piston 14 is lowered and carries out air inlet in second intake stroke.With this, can obtain required air inflow.Piston 14 begins to rise and second compression stroke begins, and lights a fire in optimum timing in second stroke.After this, carry out expansion stroke and exhaust stroke.
[0046] in six strokes operations, exhaust valve 60 with the mode identical from normal intake stroke to expansion stroke, from first intake stroke to the second compression stroke process and in the compression stroke process, close.That is, in six strokes operations, carry out control, thus in the zone that exhaust stroke begins in due course between, exhaust valve 60 opens earlier and then cuts out.
[0047] two air inlet and compression stroke cause that intake temperature raises, and can introduce required air inflow.Therefore, the required air that can obtain to burn promotes fuel and Air mixing simultaneously, and can improve the combustion condition in the cold-starting process.Similarly, the temperature rising by air inlet can make internal-combustion engine warming-up and smooth combustion quickly.Because burning has been stablized in the rising of the intake temperature when cold-starting, thus the increase of fuel injection amount can be suppressed, thus enlarge lean-limit.
[0048] the following setting table of storage in ECU 80: set up the setting table of the relation between the timing of the opening and closing of the low lift amount of pumping loss biggest place and engine speed and intake valve 40, and set up in lift amount, require the setting table of the relation between the timing of opening and closing of air inflow and intake valve 40.Low lift amount under the situation of six strokes operation and normal lift amount are set up according to these setting tables, and ECU 80 via variable valve timing mechanism 52, carries out the control to intake valve 40 according to low lift amount of setting and normal lift amount.
[0049] after internal-combustion engine 10 is by warming-up and flameholding, is transformed into the operation (four-journey operation) of a burning cycle that forms by normal four-journey.That is, carry out intake stroke so that the lift amount of intake valve 40 is controlled as normal lift amount in response to the air inflow that requires.After this, intake valve 40 is closed, and after carrying out compression stroke, in suitably timing execution igniting, after this carries out expansion stroke and exhaust stroke immediately.Similar with the situation of normal control, the appropriate time of exhaust valve 60 in the exhaust stroke of four-journey opened earlier and then closed to carry out exhaust.
[0050] ECU 80 stores and has set up normal lift amount, requires the timing of opening and closing of air inflow and intake valve 40 and the setting table of the relation between the operation angle.Under the situation of carrying out the four-journey operation, utilize described setting table to calculate normal lift amount, and in response to the normal lift amount that calculates, ECU 80 control intake valve 40 via variable valve timing mechanism 52.
[0051] when preferential rising intake temperature, it for example is effective under the situation of cold-starting process that six strokes operate in.Yet, control under the situation of described low lift amount in the execution of pumping loss biggest place, because carried out twice air inlet, so the moment loss increases.If internal-combustion engine 10 is stable by warming-up and burning, be transformed into the four-journey operation immediately.Therefore, judging that in the system of first embodiment burning is stable, is the four-journey operation from six stroke operational transition then.
[0052] especially, when the temperature in the firing chamber 24 fully raises, can judge that the burning in the internal-combustion engine 10 is stable.Therefore, detect temperature in the firing chamber 24 from the output that is installed in the temperature transducer 26 in the firing chamber 24, and if detected temperature enough high, judge that so burning is stable.ECU 80 stores the threshold value temperature cylinder, and this temperature is to be used for judging that internal-combustion engine 10 is by the minimum temperature in the warming-up and the stable firing chamber 24 of burning.If detected temperature reaches the threshold value temperature cylinder at least, the burnings in the ECU 80 judgement internal-combustion engines 10 have been stablized and have been transformed into the four-journey operation from the operation of six strokes.
[0053] Fig. 4 is for describing the flow chart of the control program of being carried out by the ECU in first embodiment of the present invention 80.The program of carrying out when the flow chart shown in Fig. 4 is internal-combustion engine 10 each startings.In the flow process shown in Fig. 4, at first detect the coolant temperature (step S100) in the internal-combustion engine 10.Coolant temperature is judged in output based on cooling-water temperature transmitter 22.Then, judge the cold-starting (step S102) that whether has required internal-combustion engine 10.Whether required cold-starting, whether the temperature that is based on the cooling liquid of for example being judged when requiring the starting of internal-combustion engine 10 in step S100 is lower than prespecified range is judged.
[0054] if required cold-starting, detects about the required information of current operational condition (S104) in step S102 judgement.For example, detect information according to the output of different sensors such as the temperature in engine speed, accelerator operation amount and the firing chamber 24.Then, calculation requirement air inflow (S106).Output based on the accelerator operation sensor comes the calculation requirement air inflow according to the load of being judged that requires.
[0055] then, whether the temperature T 24 in the judgement firing chamber 24 is more than or equal to threshold value temperature cylinder T0 (step S108).If at step S108, the temperature T 24 in the firing chamber 24 judges then that more than or equal to threshold value temperature cylinder T0 internal-combustion engine 10 is unstable by warming-up and burning, therefore carries out six strokes operations (step 110).
[0056] especially, utilize the setting table that is stored among the ECU 80, judge the low lift amount of pumping loss biggest place under the present engine rotating speed, and judge the lift amount of the intake valve 40 that is used for first intake stroke.Utilization is stored in the setting table among the ECU 80, according to the normal lift amount of being judged in step S106 that requires air inflow to judge to be used for second intake stroke.According to detected current operational condition in step S104, judge the operation angle and the phase place of the intake valve 40 when engine start.According to valve timing,, carry out control for intake valve 40 by variable valve timing mechanism 52 such as lift amount that calculates or the like.In this case, carry out first intake stroke, first compression stroke, second intake stroke and second compression stroke, after this carry out compression stroke and exhaust stroke.Carry out control so that the suitable time in the second compression stroke process is lighted a fire.In this period, carry out control so that from first intake stroke to the second compression stroke and the expansion stroke process, close exhaust valve 60, and in exhaust stroke, open exhaust valve 60 to carry out exhaust at normal valve timing place.
[0057] returns step S104,, the temperature T in the firing chamber 24 24 is compared with threshold value temperature cylinder T0 at step S108 calculating the information (step S104 and S106) that in step S104, detects after requiring air inflow about current operational condition.If do not determine temperature T 24 more than or equal to threshold value temperature cylinder T0 at step S108, then carry out six strokes operations (step S110), and the processing of execution in step S104 to S108.The processing that promptly always repeats six strokes operations (step S110) and step S104 to S108 is up to judging that in step S108 combustion chamber temperature T24 has reached threshold value temperature cylinder T0.
[0058] yet, do not required cold-starting if determine at step S102, if and the temperature T 24 in step S108 judges firing chamber 24 judges then that more than or equal to threshold value temperature cylinder T0 firing chamber 24 interior temperature T 24 have reached internal-combustion engine and have been assumed to be by the temperature T 0 of warming-up.Therefore, carry out normal four-journey operation (step S112).Especially, utilize the setting table that is stored among the ECU 80, according to requiring air inflow that the normal lift amount of intake valve 40 is set.Opening and closing timing and the operation angle that precondition is provided with exhaust valve 60 and intake valve 40 of working as according to internal-combustion engine.Under this condition, carry out normal intake stroke, compression stroke, expansion stroke and exhaust stroke, and control so that between compression stroke and expansion stroke, carry out igniting.Then, processing finishes.
[0059] as above, according to first embodiment, when carrying out cold-starting, carrying out control makes after the low lift amount of pumping loss biggest place is carried out first intake stroke and first compression stroke, carry out second intake stroke and second compression stroke, after this carry out expansion stroke and exhaust stroke.Therefore, can be under the low situation of intake temperature, such as rising intake temperature when carrying out cold-starting, thereby can either improve combustion condition, make internal-combustion engine warming-up and make flameholding as early as possible.
[0060] in first embodiment, directly detect the temperature T 24 in the firing chamber 24, and whether reach threshold temperature T0 based on this temperature T 24, judge and whether between operation of six strokes and four-journey operation, change.Yet the present invention is not limited to carry out by this way the judgement of changing between operation of six strokes and four-journey operation.If when finishing cold-starting, can judge that flameholding also can carry out aforementioned judgement with certain precision.Therefore, for example can be used for the temperature of the cooling liquid of internal-combustion engine 10, and whether be greater than or equal to the judgement of the threshold value coolant temperature of internal-combustion engine 10 when being assumed that warming-up, make the judgement of whether changing based on coolant temperature by detection.Can the threshold value coolant temperature be set based on the temperature value that experiment determines, and based on this value, consider which kind of degree the operation of six strokes should proceed to, wherein said value is by tentatively judging and representing that internal-combustion engine 10 is by warming-up.
[0061] first embodiment of the present invention has required the situation of cold-starting to be described to being judged to be.Yet, the invention is not restricted to this mode, and can under other situation of intake temperature that can preferentially raise effectively, carry out the operation of six strokes.Therefore, for example, even judging that internal-combustion engine 10 can not carry out the operation of six strokes under the situation of warming-up yet.Similarly, also can only carry out the operation of six strokes under a kind of so-called fast idle (fast idling) condition, internal-combustion engine 10 is to be higher than the rotating speed operation of normal idling speed, such as in the catalyst warmup process or in the cold-starting process under this condition.
Low lift amount in first intake stroke of [0062] six stroke operation has been described the situation of the lift amount that is used for described pumping loss biggest place.Yet in the present invention, low lift amount is not limited to this mode, but can be set to the little lift amount of pumping loss greater than the lift amount that is provided with according to requiring air inflow usually.Carry out two intake strokes even Here it is with the lift amount identical with normal lift amount, but the reason that intake temperature is raise a little.
[0063] first embodiment is described for a kind of situation, in this case according to requiring air inflow to be arranged on lift amount in second intake stroke in the six stroke operating process and the lift amount in the four-journey operation, and carry out comprise this lift amount valve timing control with the control air inflow.Yet, the invention is not restricted to this mode, but electronically controlled closure can be set in gas-entered passageway 36, and can control air inflow by the aperture of closure.In this case, the lift of the intake valve in first intake stroke can be controlled as low lift amount, and the normal lift amount in second intake stroke and the four-journey operation can be set to be used in the maximum lift under the inlet valve cam 50 rotations situation once, rather than the lift amount that is provided with according to requiring air inflow.
[0064] similarly, first embodiment is described as being used for a kind of situation, in this case, in the cold-starting process of internal-combustion engine, carry out first burning cycle with the six strokes operation that comprises first intake stroke, first compression stroke, second intake stroke, second compression stroke, expansion stroke and exhaust stroke.Yet, the invention is not restricted to this mode, but can carry out the multiple-pass operation, it comprises the repeatedly repetition of first intake stroke and first compression stroke, and carries out second intake stroke, second compression stroke, expansion stroke and exhaust stroke subsequently.In this case, the pumping loss in the first intake stroke process increases, thereby makes intake temperature raise effectively in a burning cycle.
[0065] first embodiment is described as being used for a kind of situation, in this case, the device of valve timing that is used to change intake valve 40 is for being connected to per two inlet valve cams 50 in the device on the same camshaft, the rotation of camshaft and shake by variable valve timing mechanism 52 and control, and the valve timing that comprises phase place, lift amount and the operation angle of intake valve 40 are independently controlled for each cylinder 12.Yet, the invention is not restricted to the method for this control intake valve 40.In the present invention, be used for changing intake valve 40 valve timing device can for can be in the intake stroke of a burning cycle process opening and closing valve at least twice, but also change the different structure of the lift of intake valve.Especially, for example,, can control the lift and the opening and closing timing of intake valve 40 independently for each intake valve 40 by using Electromagnetically driven valve.In the same manner, the device that is used to change the valve timing of exhaust valve 60 is not limited to the device described about first embodiment, but, can in exhaust stroke, control the different structure of the timing of opening and closing at appropriate time according to the condition that six strokes are operated (or multiple-pass operation).
[0066] be petrolic situation although first embodiment is described as being used for internal-combustion engine 10, be not limited to this mode, internal-combustion engine 10 also can be, diesel engine for example.Although the fuel that sprays by door that is exemplified as that provides sprays example, motor can be for using the internal-combustion engine of cylinder injection.
[0067] for example, in first embodiment, can implement " cold-starting decision maker " by execution in step S102, can implement " multiple-pass operation setting device ", " valve timing control gear ", reach " igniting correct timing controller " by step S110, can implement " the multiple-pass operation stops decision maker " by execution in step S108, can implement " four-journey operation setting device " by execution in step S112, and implement " temperature-detecting device " and " coolant temperature detection device " by execution in step S104.
[0068] below with reference to Fig. 5 and Fig. 6 second embodiment of the present invention is described.The description of second embodiment will concentrate on the exclusive characteristic of second embodiment, and the description of the part identical with first embodiment will be simplified or omit.System in second embodiment have with first embodiment in system's identical construction.In the system in second embodiment, except be used for judging from the operation of six strokes be transformed into the method for timing of four-journey operation different with the first embodiment method, to carry out control as identical mode in first embodiment.
[0069] especially, in the system of second embodiment, make the judgement of operating the conversion of four-journey operation from six strokes according to engine load.Fig. 5 is whether the relation of having described between coolant temperature and the threshold engine load is transformed into the plotted curve that four-journey is operated from the operation of six strokes to judge.In Fig. 5, transverse axis is represented coolant temperature and the longitudinal axis is represented threshold engine load.As above, in six strokes operations, intake stroke has carried out twice, and in twice intake stroke, in first intake stroke to be set to carrying out air inlet in the lift amount of the lift amount of pumping loss biggest place.Therefore, compare with the situation of normal four-journey operation, the moment of generation is little.Therefore, under the big situation of load change, be difficult to produce moment according to the load of six strokes operation.Therefore, no matter whether internal-combustion engine 10 warming-up is requiring load to be higher than under the situation of specified load,, carry out operating the conversion of four-journey operation from six strokes for according to requiring load to produce moment.That is, the rising that requires load of the internal-combustion engine 10 on the solid line (i) (threshold engine load (i)) is first conditions of operating the conversion of four-journey operation from six strokes in Fig. 5.
[0070] in the operation of six strokes, the increase of intake temperature makes the easier burning of fuel.If engine load becomes under this condition greatly, unusual burning causes detonation easily.Similarly, if this abnormal combustion takes place, can suppose that the warming-up of internal-combustion engine 10 proceeds to a certain degree.Therefore, in second embodiment,, only when engine load is in the scope that does not cause detonation, allow the operation of six strokes for preferential inhibition detonation.As the solid line among Fig. 5 (ii) shown in, consider the generation of detonation and the limiting value that requires load that is provided with, littler than the limiting value when the temperature of the cooling liquid that is used for internal-combustion engine 10 is high, and hour become higher when coolant temperature.Consider the inhibition of detonation, the solid line in Fig. 5 (ii) rising on (threshold engine load (ii)) is a second condition of operating the conversion of four-journey operation from six strokes.
[0071] by foregoing, in second embodiment, when cold-starting, carry out six strokes operations, and if satisfy following first or second condition just be transformed into the four-journey operation.First condition is (requiring load) 〉=(threshold engine load (i)), and second condition is (requiring load) 〉=(threshold engine load (ii)).
[0072] promptly, when coolant temperature with when requiring in the zone of load thick line (I) below, carry out the operation of six strokes and continue, and the value of solid line (I) is for being transformed into the threshold engine load that four-journey is operated from the operation of six strokes.Threshold engine load is coolant temperature lower threshold value engine load (i) and the smaller of threshold engine load in (ii) at that time.Based on relation as shown in Figure 5, ECU 80 stores the setting table of having set up the relation between coolant temperature and the threshold engine load.Based on detected coolant temperature, use described setting to show the calculated threshold engine load.
[0073] Fig. 6 is the flow chart of having described by the control program of 80 execution of the ECU in second embodiment of the present invention.Except behind the step S104 of Fig. 4, execution in step S202, and after the step S106 execution in step S204, and execution in step S204 and S206 replace outside the step S108, the program of Fig. 6 is the same with the program of Fig. 4.
[0074] especially, judge internal-combustion engine just from cryogenic conditions at step S102 place, i.e. cold-starting starting detects the information (step S104) about operational condition then.In this case, come detection of engine rotating speed, accelerator operation amount according to output from different sensors, and the coolant temperature coolant temperature that has replaced firing chamber 24.Then, calculation engine load (S202).Come calculation engine load based on the information relevant with the operational condition of detected internal-combustion engine 10 in step S104.Then, calculation requirement air inflow (step S106), and calculated threshold engine load (step S204).According to the coolant temperature of in step S104, calculating, utilize the setting table (with reference to figure 5) that is stored among the ECU 80 to come the decision threshold engine load.
[0075] then, judge that whether current load is more than or equal to threshold engine load (step S206).That is, compare load that calculates at step S202 and the load that calculates at step S204, and judge that whether engine load is more than or equal to threshold engine load.If judge engine load more than or equal to threshold engine load, then carry out six strokes and operate (step S110) at step S206.Promptly, carry out control so that when low lift amount, carry out first intake stroke and carry out first compression stroke and when normal lift amount, carry out second intake stroke, execution second compression stroke with intake valve 40 with intake valve 40, and carry out igniting, carry out expansion stroke and exhaust stroke subsequently.Repeating step S104, S202, S106, S204, S206 and S110 are up to judging that in step 206 engine load is more than or equal to threshold engine load.
[0076] yet, if do not judge internal-combustion engine just from cold-starting starting at step S102, if perhaps judge that in step 206 engine load more than or equal to threshold engine load, is provided with four-journey operation (step S112), and this processing finishes.
[0077] as mentioned above, in second embodiment, be provided for being transformed into the threshold engine load of four-journey operation, and power operation be transformed into the four-journey operation from the operation of six strokes according to set threshold engine load from the operation of six strokes according to coolant temperature.Therefore, if require engine load big and internal-combustion engine can not produce corresponding to the output torque that requires load with the operation of six strokes,, can avoid operation of six strokes and execution four-journey to operate if perhaps estimate to take place detonation owing to abnormal combustion.Similarly, continuing the operation of six strokes is met up to above-mentioned first or second condition.Therefore, if intake temperature is low when the internal-combustion engine cold-starting, the temperature of the air inlet that can raise is reliably also improved combustion condition.
[0078] second embodiment is described as being used for a kind of situation, and conversion load is set to consider first condition that requires engine load and the smaller who considers in the second condition that detonation takes place in this case.Yet in the present invention, threshold engine load does not need to consider simultaneously the two, but can consider any in first condition and the second condition and be provided with.
[0079] in second embodiment, can implement " requiring the LOAD FOR device " by execution in step S202, and pass through execution in step S206, can implement " the multiple-pass operation stops decision maker ".
[0080] below with reference to Fig. 7 the 3rd embodiment of the present invention is described.Following explanation will only concentrate on the characteristic in the 3rd embodiment, will be simplified or omit with the explanation of the first embodiment same section.System in the 3rd embodiment has the structure with system's same type of first embodiment.In the system in the 3rd embodiment, be transformed into the operation of six strokes from the four-journey operation except the temperature in the forecast combustion chamber 24 and based on predicted temperature, its with first embodiment in identical mode carry out control.
[0081] especially, in the system in the 3rd embodiment, also when cold-starting, carry out the operation of six strokes.Can be based on detected air inflow in six stroke operating process, predicted temperature rising Δ T after the intake stroke of six strokes operation.Therefore, after second intake stroke in the operation of six strokes, the predicted temperature Tp in firing chamber 24 can be represented with Current Temperatures T24 in the firing chamber and temperature rising Δ T by the form of equation (1):
The chamber temperature Tp=chamber temperature T24+ Δ T of prediction ... (1)
[0082] before the operation of beginning six strokes,, when carrying out the operation of six strokes, reality also have intake temperature to have the situation of excessive rising to take place even the temperature in the firing chamber 24 is lower than threshold engine load.If light a fire in this case, because may cause abnormal combustion or detonation takes place, so preferably avoid this situation.Therefore, to notice as above that in the 3rd embodiment, prediction is the temperature Tp firing chamber 24 in after second intake stroke in the six strokes operations, and if predicted temperature Tp be at least threshold engine load T0, just be transformed into four-journey and operate.
[0083] Fig. 7 is the flow chart of having described by the control program of 80 execution of the ECU in the 3rd embodiment.Flow chart shown in Fig. 7 has the step S302 to S310 except after the step S110 in the flow chart shown in Fig. 4, and is identical with the program shown in Fig. 4.Especially, in first burning of judging cold-starting at step S102, if judge that at step S108 the Current Temperatures T24 in the firing chamber 24 is lower than threshold value temperature cylinder T0, then carry out six strokes operations (step S110), after this detect the information relevant once more, such as the temperature T in the firing chamber in first and second intake strokes 24 24 or air inflow or the like (step S302) with operational condition.
[0084] then, calculation requirement air inflow (step S304).After this, based on the air inflow in detected first and second intake strokes of step S302, accounting temperature rising Δ T (step S306).Temperature rising Δ T can judge from the setting table of having set up the relation between the rising of air inflow and temperature.Then, calculate the predicted temperature Tp (step S308) after second intake stroke in firing chamber 24.Calculate firing chamber predicted temperature Tp according to above-mentioned equation (1).
[0085] then, judge that whether firing chamber predicted temperature Tp is more than or equal to threshold value prediction temperature cylinder T0 (step S310).If judge firing chamber predicted temperature Tp more than or equal to threshold value temperature cylinder T0, carry out the operation of six strokes once more at step S110, and the processing of execution in step S302 to S310.That is, as long as do not judge that at step S310 firing chamber predicted temperature Tp more than or equal to threshold value prediction temperature cylinder T0, just carries out the operation of six strokes at step S110.Yet, if judge that at step S310 firing chamber predicted temperature Tp more than or equal to threshold value prediction temperature cylinder T0, is provided with four-journey operation and processing and finishes.
[0086] as mentioned above, according to the 3rd embodiment, when internal-combustion engine 10 is being cold-starting when starting from cryogenic conditions just, when carrying out the operation of six strokes, the chamber temperature of prediction after carrying out the operation of six strokes, and judge whether be transformed into the four-journey operation based on predicted temperature.The excessive temperature that therefore can suppress in the firing chamber 24 rises, and can prevent effectively because the detonation that abnormal combustion causes.
[0087] the 3rd embodiment is described as being used for a kind of situation, and in this case, the temperature in the firing chamber 24 are detected by temperature transducer 26, and rises from detected temperatures with by the temperature of air inflow prediction and to calculate predicted temperature.Yet the method that is used to calculate the predicted temperature Tp in the firing chamber 24 is not limited to this method, and can be to calculate by other method.For example, coolant temperature when the temperature initial value in the firing chamber 24 can be by starting is predicted, after this calculate temperature rising Δ T from the air inflow of the intake stroke (first intake stroke and second intake stroke) that is used for each burning cycle, and temperature rising Δ T can be added to one by one on the initial value of the temperature in the firing chamber 24 with the temperature in the forecast combustion chamber 24.Also have, for example, the combustion pressure sensor that detects firing pressure is set, and can comes the indoor temperature of forecast combustion from firing pressure and air inflow.In addition, directly detect the temperature in the firing chamber 24, and can be from the predetermined temperature next time of variable quantity.Alternatively, temperature transducer is arranged near the intake valve with direct detection intake temperature, and comes temperature in the forecast combustion chamber 24 based on intake temperature.
[0088] if the predicted temperature that the 3rd embodiment is described as being used in the firing chamber 24 meets or exceeds threshold value prediction temperature cylinder, just is transformed into the situation of four-journey operation.Yet, the invention is not restricted to this mode, and if the predicted temperatures in the firing chamber 24 be at least threshold value prediction temperature cylinder, lift amount can be increased prearranging quatity from low lift amount, low lift amount is changed gradually up to reaching normal lift amount, continues the operation of six strokes in this process.With this, when being transformed into the four-journey operation, moment variations can be suppressed be small quantity.When carrying out this control, threshold value prediction temperature cylinder can be set to be lower than normal value.In addition, the variable quantity that the amount of gradually changing of lift amount is not limited to fix in the six stroke operating process.
[0089] in the 3rd embodiment,, can implement " temperature prediction device in the cylinder " by execution in step S306 and S308, and pass through execution in step S310, can implement " the multiple-pass operation stops decision maker ".
[0090] below with reference to Fig. 8 and Fig. 9 the 4th embodiment of the present invention is described.The description of the 4th embodiment will only concentrate on the characteristic of the 4th embodiment, and the description of the part identical with first to the 3rd embodiment will be simplified or omit.Except be used as variable fuel vehicle (flexible fuel vehicle, FFV) outside, the system in the 4th embodiment have with first embodiment in the structure of system's same type.Especially, the system in the 4th embodiment uses the mixture of alcohols such as ethanol, methyl alcohol, bio-ethanol, biological methanol or these alcohols and gasoline to act as a fuel.Act as a fuel and use possibility no matter the ratio of the alcohol fuel in the employed fuel.
System in [0091] the 4th embodiment carries out the operation of six strokes when cold-starting.The control of carrying out by the system of the 4th embodiment, except when whether judge when the operation of six strokes is transformed into the four-journey operation, outside the threshold value temperature cylinder that is provided with according to the alcohol concentration in the fuel, threshold value coolant temperature, threshold engine load or the threshold value prediction temperature cylinder, its with first embodiment in identical.Fig. 8 has been for having described in the 4th embodiment of the present invention, is used for being transformed into the plotted curve that concerns between the alcohol concentration of fuel of four-journey operation and the threshold value coolant temperature.
[0092] ratio of alcohol fuel is not fixed in the fuel in the aforesaid system that is used for the 4th embodiment.Yet the concentration of the alcohol that comprises in the employed fuel is for influencing the factor of fuel atomization when fuel is introduced in the cylinder 12.Especially, low in alcohol concentration and under the situation that gasoline concentration is high, even when low temperature relatively fuel atomizing takes place easily also, yet along with the alcohol concentration in the fuel increases, fuel becomes and is difficult to atomizing.Therefore, the temperature that the fuel of specified rate can be atomized is high more, and alcohol concentration is high more.
[0093] therefore, special when cold-starting when the temperature in the different parts of internal-combustion engine 10 is hanged down, alcohol concentration is high more, in order to obtain smooth combustion, the temperature of the air inlet that is necessary more to raise is so that the easier atomizing of fuel.Therefore, when carrying out the operation of six strokes in order to raise intake temperature, it is high more that intake temperature is become, and the concentration of alcohol fuel is just high more.Promptly, as shown in Figure 8, following control is continued, and 24 inside temperatures reach higher temperature up to the firing chamber: alcohol concentration is high more, and the threshold value coolant temperature that is transformed into the four-journey operation from the operation of six strokes is become high more, with the intake temperature in the six strokes operation that raises.
[0094] ECU 80 stores the alcohol concentration set up in the fuel as shown in Figure 8 and the setting table of the relation between the threshold value coolant temperature.When making internal-combustion engine 10 cold-startings, detect the alcohol concentration of fuel, and, show the calculated threshold coolant temperature according to described setting according to detected alcohol concentration.If the coolant temperature in the internal-combustion engine 10 meets or exceeds the threshold value coolant temperature, then be transformed into the four-journey operation from the operation of six strokes.
[0095] Fig. 9 is the flow chart of having described by the control program of 80 execution of the ECU in the 4th embodiment.Except the execution of step S402 to S406 has replaced among Fig. 4 the step S108 after the step S106, the program of Fig. 9 is identical with program among Fig. 4.Especially, if judge that at step S102 internal-combustion engine just from the cryogenic conditions starting, detects the information relevant with operational condition, calculation requirement air inflow (step S104 and S106), and the alcohol concentration (step S402) of reading the fuel of current use.The alcohol concentration of fuel is stored among the ECU 80.So, replace reading alcohol concentration from ECU, the densitometer of concentration that can the installation and measuring alcohol fuel is to detect alcohol concentration.
[0096] then, calculated threshold coolant temperature (step S404).According to the setting table that is stored in advance among the ECU 80, institute's calculated threshold coolant temperature is used as the value corresponding to the alcohol concentration of reading in step S402.Then, whether judge in the detected coolant temperature of step S104 more than or equal to threshold value coolant temperature (step S406), and if do not judge coolant temperature more than or equal to the threshold value coolant temperature, six strokes operations (step S110) then carried out.In step S104, S106, S402 to S406 and S110, repeat the operation of six strokes up to judging that at step S406 coolant temperature is more than or equal to the threshold value coolant temperature.If judge that at step S406 coolant temperature more than or equal to the threshold value coolant temperature, is transformed into four-journey operation (step S112).
[0097] as mentioned above, in the 4th embodiment, come the calculated threshold coolant temperature according to the alcohol concentration in the fuel.Therefore, can continue the operation of six strokes and reach a temperature of setting according to alcohol concentration up to coolant temperature, flameholding under this temperature, and it is temperature required to arrive to carry out warming-up reliably.Also can be according to the concentration adjustment combustibility of alcohol fuel.When being difficult to obtain smooth combustion owing to high alcohol concentration, reach higher temperature by proceeding the operation of six strokes, elevated temperature is to obtain stable burning quickly.Particularly when including alcohol fuel in the fuel that uses, although the cold-starting situation of difficult is arranged, can by as above-mentioned the 4th embodiment carry out six strokes and operate temperature in the firing chamber 24 that raises quickly.Therefore, because combustion chamber temperature become fuel can be by the temperature of faster atomizing, so can improve the starting characteristic of internal-combustion engine.In the motor that uses low volatility fuel, such as in FFV, the 4th embodiment can be improved starting characteristic effectively.
[0098] the 4th embodiment is described as being used to using the situation of the fuel combination of alcohol fuel or alcohol fuel and gasoline.Yet, the invention is not restricted to this mode, but also can use the so-called biological alcohol that comprises gasoline replacing or the fuel of light oil.In this case, if common alcohol concentration height, the threshold value coolant temperature also will be set to height.By this way, by in advance every kind of fuel is provided with relation between threshold value coolant temperature and the alcohol concentration experimentally, the 4th embodiment also may be used on other alcohol fuel.
[0099] the 4th embodiment is described as being used for being provided with according to alcohol concentration the situation of threshold value coolant temperature.Yet the 4th embodiment is not limited to this mode.For example, threshold value cooling liquid T0 is about the chamber temperature T24 in first embodiment, threshold engine load in second embodiment, and threshold value prediction coolant temperature T0 all can be provided with according to alcohol concentration about the firing chamber predicted temperature Tp in the 3rd embodiment.Each these threshold value can obtain based on experimental setting table according to alcohol concentration.
[0100] similarly, for example, in the 4th embodiment,, can implement " decision content setting device " by execution in step S302 and step S304.
[0101] below with reference to Figure 10 the 5th embodiment of the present invention is described.The description of the 5th embodiment will only concentrate on the characteristic of the 5th embodiment, and the description of the part identical with first to fourth embodiment will be simplified or omit.Except motor was so-called V-h type engine h with a plurality of cylinders, the system in the 5th embodiment was identical with the system of Fig. 1.
[0102] especially, the internal-combustion engine 10 in the 5th embodiment has two groups (hereinafter referred to as " row ", bank) cylinder.In this system,, all be operated (all cylinder operation) with whole cylinders 12 and come operating internal-combustion engines 10 if require load big.On the contrary, if require load little, a row cylinder operation only, and the cylinder that belongs to another row stops (reduction cylinder operation).
[0103] under the situation of reduction cylinder operation, wherein only row cylinder operation, the cylinder that belongs to another row stops.In this case, if require load to become big, be transformed into whole cylinder operation from the reduction cylinder operation.That is those row (supplementary column) that, stop to be started.So, even the operated cylinder 12 of action column side that is positioned at is by warming-up in reduction cylinder operation process, if the reduction cylinder operation continues a very long time and when cold-starting under the reduction cylinder operation, the cylinder of the supplementary column that is stopped in reduction cylinder operation process may be by abundant warming-up.In this case, after cylinder operation was transformed into whole cylinder operation from reduction, the rising that can predict the intake temperature in the supplementary column immediately was insufficient, and the burning in the cylinder of supplementary column also can reduce.
[0104] under said circumstances, if the cylinder of supplementary column 12 not by warming-up and remain low temperature, system when the supplementary column recovery operation in the 5th embodiment carries out the six strokes operation of a burning cycle.Promptly, about this supplementary column, be arranged on the low lift amount of pumping loss biggest place, and carry out first intake stroke and first compression stroke, lift amount is set to normal lift amount and carries out second intake stroke, second compression stroke, expansion stroke and exhaust stroke then thereafter.After this, if the temperature T 24 in the firing chamber of supplementary column 24 meets or exceeds threshold value temperature cylinder T0, then finish the operation of six strokes and carry out the four-journey operation.
[0105] in this process, maintains the current operational condition of the action column of operating in the reduction cylinder operation process.That is, for example, according to the program shown in Fig. 4, under the situation of carrying out the four-journey operation, carry out the four-journey operation, and under the situation of carrying out the operation of six strokes, carry out the operation of six strokes.To be terminated if judge the operation of six strokes, then be transformed into the four-journey operation.When passing through the operation of four-journey operation recovery supplementary column, internal-combustion engine 10 beginnings are operated and are operated with whole cylinders 12.When the row that stop to turn back to the four-journey operation, ignition timing was transformed into the ignition timing that is provided with for whole cylinder operation in advance, and then, the intake valve 40 of each cylinder 12 and the timing of exhaust valve 60 are transformed into the valve timing that sets in advance.
[0106] Figure 10 is the flow chart of the control program carried out by the system of the 5th embodiment.The program of Figure 10 is repeated to carry out in the operating process of internal-combustion engine 10.Especially, judge whether reducing cylinder operation at step S502.If do not judge and reducing cylinder operation, then continue current operation and end process.
[0107] yet, if judge at step S502 and to reduce cylinder operation, detect the information (step S504) relevant then with operational condition.Detect required information based on output from different sensors, for example engine speed and air inflow, and coolant temperature or the like.Then, calculate the current load (step S506) that requires.Come calculation requirement load based on accelerator operation amount.Then, judge whether require to be transformed into whole cylinder operation (step S508) from the reduction cylinder operation.For example, whether be higher than predetermined load based on the load that calculates at step S506 and judge whether require to be transformed into whole cylinder operation from the reduction cylinder operation.If judge that at step S508 requirement is transformed into whole cylinder operation, continues current operation and end process.
[0108] yet, if do not judge that at step S508 requirement is transformed into whole cylinder operation, judge the cold-starting (S510) whether carry out supplementary column.Especially, whether be lower than predetermined coolant temperature based on the coolant temperature in the detected supplementary column of step S504 and carry out this judgement.
[0109] if judges supplementary column just from the cold-starting recovery at step S510, the temperature T 24 (step S512) in the firing chamber 24 of the cylinder 12 in the detection supplementary column.Then, judge that whether temperature T 24 is more than or equal to the threshold value temperature cylinder T0 (step S514) that is used for being transformed into from the operation of six strokes the four-journey operation.If do not judge temperature T 24 more than or equal to threshold value temperature cylinder T0, be set to the operation of six strokes in step S516 supplementary column at step S514.That is, first intake stroke is set to low lift amount with intake valve 40 and carries out, and carries out first compression stroke.After first intake stroke and first compression stroke, second intake stroke is set up normal lift amount and carries out and carry out second compression stroke with intake valve 40, carries out expansion stroke and exhaust stroke thereafter.After this, processing turns back to step S512.The six strokes operation of step S512, S514 and S516 is repeated until that the temperature T 24 in step S514 judges firing chamber 24 meets or exceeds threshold value temperature cylinder T0.
[0110] do not judge that at step S510 the cylinder 12 of supplementary column just is being resumed from cryogenic conditions, and judge that at step S514 temperature T 24 is more than or equal to threshold value temperature cylinder T0, carry out normal four-journey operation at step S518, and carry out whole cylinder operation immediately.After this, processing finishes.
[0111] as mentioned above, according to the 5th embodiment, even when the operation of the supplementary column of recovering to be stopped, by carrying out the operation of six strokes with elevated temperature, the temperature in the firing chamber 24 of the supplementary column that can raise quickly makes burning to stablize.
[0112] in the system in the 5th embodiment, even also can be when carrying out the cold-starting of internal-combustion engine 10 with the starting of reduction cylinder operation.Carrying out under the situation of cold-starting with the reduction cylinder operation, the program of Fig. 4 is carried out in the mode identical with the first concrete enforcement, and supplementary column only operates in six strokes operations, and the temperature T 24 in the firing chamber 24 of supplementary column is elevated to threshold value temperature cylinder T0.By this way, even when carrying out the cold-starting of internal-combustion engine 10, also can operate with the temperature in the firing chamber 24 of rising supplementary column with smooth combustion quickly by carrying out six strokes.Even, can improve oil consumption rate because under cryogenic conditions, also can carry out the reduction cylinder operation by this way.
[0113] for example, in the 5th embodiment, can implement " cold-starting decision maker ", and can implement " multiple-pass operation equipment " by execution in step S516 by execution in step S510.
[0114] in above-mentioned embodiment, under the situation that relates to number of components, quality and scope or the like, unless in principle quantity offered some clarification on as specific quantity or clearly, otherwise to the explanation quantity without limits.And, structure of in embodiment, describing and step method, unless in principle as specified structure with method is clearly illustrated or clearly, otherwise be not that the present invention is essential in fact.
Claims (13)
1, a kind of control apparatus that is used for internal-combustion engine comprises:
The variable valve actuation device, it is used to change the timing and the lift amount of the opening and closing of intake valve, and described intake valve is arranged in the suction port that communicates with the cylinder of described internal-combustion engine;
The valve timing control gear, it is used for controlling by described variable valve actuation device the described timing and the lift amount of the described opening and closing of described intake valve;
The cold-starting decision maker, it is used to judge whether described internal-combustion engine just starts from cold-starting; And
Multiple-pass operation setting device, it is used for judging that when described cold-starting decision maker described internal-combustion engine is just when cold-starting is started, the multiple-pass operation is set, a burning cycle at internal-combustion engine described in the described multiple-pass operation comprises two above air inlets and compression stroke, wherein said multiple-pass operation is by first intake stroke and first compression stroke and second intake stroke and second compression stroke, be that combustion stroke and exhaust stroke are formed subsequently
Wherein in described first intake stroke and the described first compression stroke process, described valve timing control gear is controlled to be low lift amount with the lift of described intake valve, described low lift amount is less than the required normal lift amount of the air inlet that is used for the requirement air inflow, and in described second intake stroke and described second compression stroke, described valve timing control gear is controlled to be described normal lift amount with the described lift of described intake valve.
2, control apparatus according to claim 1, wherein
Described low lift amount is the lift of pumping loss biggest place in described first intake stroke and the described first compression stroke process.
3, control apparatus according to claim 1 and 2 further comprises:
Igniting correct timing controller, it is used for coming the control ignition timing by the spark plug that is arranged on described cylinder, wherein forbids igniting at igniting correct timing controller described in described first intake stroke and the described first compression stroke process.
4, according to any described control apparatus in the claim 1 to 3, wherein
In a burning cycle process, described multiple-pass operation setting device is described first intake stroke and described first compression stroke, carries out described second intake stroke subsequently and described second compression stroke is set to rerun repeatedly.
5, according to any described control apparatus in the claim 1 to 4, further comprise:
The multiple-pass operation stops decision maker, and it is used to judge whether the multiple-pass operation will be terminated; And
Four-journey operation setting device, judge that the multiple-pass operation will be terminated if it is used for described multiple-pass operation termination decision maker, a burning cycle of the burning of described internal-combustion engine is set to comprise the four-journey operation of intake stroke, compression stroke, expansion stroke and exhaust stroke.
6, control apparatus according to claim 5 further comprises:
Temperature-detecting device, it is used for detecting the temperature of described cylinder, wherein
If the temperature in the described cylinder is more than or equal to the threshold value temperature cylinder, then described multiple-pass operation stops decision maker and judges that the multiple-pass operation will be terminated.
7, control apparatus according to claim 5 further comprises:
The coolant temperature detection device, it is used to detect the temperature of the described cooling liquid of described internal-combustion engine, wherein
If the described temperature of described cooling liquid is more than or equal to the threshold value coolant temperature, then described multiple-pass operation stops decision maker and judges that the multiple-pass operation will be terminated.
8, control apparatus according to claim 5 further comprises:
Require the LOAD FOR device, it is used to calculate the load that requires on the described internal-combustion engine, wherein
If what calculate requires load more than or equal to threshold engine load, then described multiple-pass operation stops decision maker and judges that the multiple-pass operation will be terminated.
9, control apparatus according to claim 5 further comprises:
The temperature cylinder prediction unit, it is used in a burning cycle, and before described first intake stroke and described first compression stroke began, prediction is the temperature in the cylinder after carrying out described second intake stroke and described second compression stroke, wherein
If the temperature in the described cylinder of prediction is predicted temperature cylinder more than or equal to threshold value, then described multiple-pass operation stops decision maker and judges that the multiple-pass operation will be terminated.
10, according to any described control apparatus in the claim 6 to 9, wherein
Described internal-combustion engine uses the fuel that contains alcohol to act as a fuel, and described control apparatus further comprises the decision content setting device, and it is used for alcohol concentration according to described fuel in described threshold value temperature cylinder, described threshold value coolant temperature, described threshold engine load and the described threshold value prediction temperature cylinder any one is set.
11, according to any described control apparatus in the claim 1 to 10, wherein
Described internal-combustion engine has first cylinder block and second cylinder block, and wherein
Described control apparatus is only operated the cylinder that belongs to described first cylinder block, and comprises
Reduction cylinder operation setting device, its cylinder that is used for belonging to described second cylinder block is set to reduce cylinder operation, is stopped at cylinder described in the described reduction cylinder operation, and
Whole cylinder operation setting devices, its cylinder that is used for all belonging to the cylinder of described first cylinder block and belonging to described second cylinder block is set to whole cylinder operation, and all cylinders are operated in described whole cylinder operation, wherein
When described motor was converted to whole cylinder operation from reducing cylinder operation, described cold-starting decision maker judged whether the recovery of the operation of the described cylinder that belongs to described second cylinder block is cold-starting, and
When described cold-starting decision maker judge the described cylinder that belongs to described second cylinder block operation revert to described cold-starting the time, the described operation setting that described multiple-pass operation setting device will belong to the cylinder of described second cylinder block is the multiple-pass operation.
12, according to any described control apparatus in the claim 1 to 11, wherein
Described variable valve actuation device has: the inlet valve cam that drives the described opening and closing of described intake valve, with the motor of the described inlet valve cam of rotation driving, wherein said valve timing control gear drives by the described rotation of using the described inlet valve cam of described motor control and controls described valve timing.
13, a kind of method of controlling combustion engine comprises:
Judge whether described internal-combustion engine begins starting from cold-starting;
The operation of execution multiple-pass, described multiple-pass operates in the burning cycle of described internal-combustion engine and comprises: by plural air inlet and the compression stroke that first intake stroke and first compression stroke and second intake stroke and second compression stroke are formed, be combustion stroke and exhaust stroke subsequently; And
In described first intake stroke and the described first compression stroke process, the lift of intake valve is controlled to be low lift amount, described low lift amount is less than the required normal lift amount of the air inlet that is used for the requirement air inflow, and in described second intake stroke and described second compression stroke described lift of described intake valve is controlled to be described normal lift amount.
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| JP131880/2006 | 2006-05-10 | ||
| JP2006131880A JP2007303348A (en) | 2006-05-10 | 2006-05-10 | Control device for internal combustion engine |
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| CN101341324A true CN101341324A (en) | 2009-01-07 |
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| CNA2007800008124A Pending CN101341324A (en) | 2006-05-10 | 2007-05-08 | Control apparatus for an internal combustion engine and method for controlling the same |
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| US (1) | US20090145382A1 (en) |
| EP (1) | EP2016272A1 (en) |
| JP (1) | JP2007303348A (en) |
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| US7079935B2 (en) * | 2004-03-19 | 2006-07-18 | Ford Global Technologies, Llc | Valve control for an engine with electromechanically actuated valves |
-
2006
- 2006-05-10 JP JP2006131880A patent/JP2007303348A/en active Pending
-
2007
- 2007-05-08 US US11/988,864 patent/US20090145382A1/en not_active Abandoned
- 2007-05-08 EP EP07734503A patent/EP2016272A1/en not_active Withdrawn
- 2007-05-08 WO PCT/IB2007/001188 patent/WO2007129206A1/en active Application Filing
- 2007-05-08 CN CNA2007800008124A patent/CN101341324A/en active Pending
- 2007-05-08 BR BRPI0702893-8A patent/BRPI0702893A2/en not_active Application Discontinuation
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106930846A (en) * | 2015-12-29 | 2017-07-07 | 长城汽车股份有限公司 | The control method of many stroke cycle engines, system and vehicle |
| CN106930852A (en) * | 2015-12-29 | 2017-07-07 | 长城汽车股份有限公司 | The control method of many stroke cycle dual fuel engines, system and vehicle |
| CN110030062A (en) * | 2017-11-13 | 2019-07-19 | 大众汽车有限公司 | Method for reducing particulate emission in the cold start-up of internal combustion engine |
| CN110030062B (en) * | 2017-11-13 | 2021-12-03 | 大众汽车有限公司 | Method for reducing particulate emissions during cold start of an internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2016272A1 (en) | 2009-01-21 |
| US20090145382A1 (en) | 2009-06-11 |
| WO2007129206A1 (en) | 2007-11-15 |
| BRPI0702893A2 (en) | 2011-03-15 |
| JP2007303348A (en) | 2007-11-22 |
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