WO2011055629A1 - エンジンの吸気装置 - Google Patents
エンジンの吸気装置 Download PDFInfo
- Publication number
- WO2011055629A1 WO2011055629A1 PCT/JP2010/068319 JP2010068319W WO2011055629A1 WO 2011055629 A1 WO2011055629 A1 WO 2011055629A1 JP 2010068319 W JP2010068319 W JP 2010068319W WO 2011055629 A1 WO2011055629 A1 WO 2011055629A1
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- WO
- WIPO (PCT)
- Prior art keywords
- intake
- valve
- passage
- intake valve
- engine
- Prior art date
Links
- 239000000446 fuel Substances 0.000 claims description 48
- 238000002347 injection Methods 0.000 claims description 23
- 239000007924 injection Substances 0.000 claims description 23
- 230000007246 mechanism Effects 0.000 abstract description 9
- 239000000203 mixture Substances 0.000 description 16
- 238000002485 combustion reaction Methods 0.000 description 15
- 238000007906 compression Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 7
- 238000005086 pumping Methods 0.000 description 7
- 230000006835 compression Effects 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 230000002238 attenuated effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000000889 atomisation Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization 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
-
- 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
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
- F01L1/181—Centre pivot rocking arms
-
- 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
- F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
- F01L3/06—Valve members or valve-seats with means for guiding or deflecting the medium controlled thereby, e.g. producing a rotary motion of the drawn-in cylinder charge
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B31/00—Modifying induction systems for imparting a rotation to the charge in the cylinder
- F02B31/08—Modifying induction systems for imparting a rotation to the charge in the cylinder having multiple air inlets
- F02B31/085—Modifying induction systems for imparting a rotation to the charge in the cylinder having multiple air inlets having two inlet valves
-
- 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
- F02D13/0257—Independent control of two or more intake or exhaust valves respectively, i.e. one of two intake valves remains closed or is opened partially while the other is fully opened
-
- 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
- F02D41/32—Controlling fuel injection of the low pressure type
- F02D41/34—Controlling fuel injection of the low pressure type with means for controlling injection timing or duration
- F02D41/345—Controlling injection timing
-
- 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
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
- F01L1/185—Overhead end-pivot rocking arms
-
- 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
- F01L1/20—Adjusting or compensating clearance
- F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
- F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
- F01L1/2405—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically by means of a hydraulic adjusting device located between the cylinder head and rocker arm
-
- 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
- F01L1/344—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 changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/047—Camshafts
- F01L1/053—Camshafts overhead type
- F01L2001/0537—Double overhead camshafts [DOHC]
-
- 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
- F01L2305/00—Valve arrangements comprising rollers
-
- 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
- F01L2800/06—Timing or lift different for valves of same cylinder
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
- F01N2240/36—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being an exhaust flap
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B17/00—Engines characterised by means for effecting stratification of charge in cylinders
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/1015—Air intakes; Induction systems characterised by the engine type
- F02M35/10177—Engines having multiple fuel injectors or carburettors per cylinder
-
- 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
- Y02T10/40—Engine management systems
Definitions
- the present invention relates to an intake device for an engine using a high expansion ratio cycle.
- Patent Document 1 an engine with a high expansion ratio cycle makes the expansion ratio in the combustion cycle larger than the compression ratio by delaying the closing timing of the intake valve. This reduces pump loss (pumping loss) to improve thermal efficiency and avoids knocking.
- the air-fuel mixture sucked into the cylinder is sheared due to a change in the intake flow velocity, and is compressed while generating turbulence. Due to this disturbance, the air-fuel mixture is uniformly diffused into the cylinder, and stable combustion is obtained.
- the intake valve is in an open state until the middle of the compression process. For this reason, the air-fuel mixture blows into the intake passage, and the disturbance of the air-fuel mixture in the cylinder is rapidly attenuated.
- the intake valve is closed after the middle of the compression process, the turbulence of the air-fuel mixture in the cylinder has almost disappeared, causing a problem that combustion becomes unstable.
- an object of the present invention is to reduce the pumping loss of the engine, realize stable combustion, and improve fuel efficiency.
- An engine intake device of the present invention that solves such a problem is arranged side by side with a first intake passage for supplying fresh air into a cylinder, and the second intake air for supplying fresh air into the cylinder.
- a first intake valve that opens and closes the first intake passage at the opening of the first intake passage
- a second intake valve that opens and closes the second intake passage at the opening of the second intake passage.
- the opening timing of the first intake valve is advanced from the top dead center, and the valve lift amount of the first intake valve is different from the valve lift amount of the second intake valve in the intake stroke.
- the valve lift amount of the first intake valve is longer than the valve lift amount of the second intake valve.
- the engine intake device may be configured such that the valve lift amount of the first intake valve is larger than the valve lift amount of the second intake valve in the first half of the intake stroke.
- the engine intake device may be configured such that the first intake valve opens before the second intake valve. As a result, while the first intake valve is open and the second intake valve is closed, fresh air passes through the first intake passage and a swirling flow can be formed.
- the engine intake device may be configured such that the first intake valve is closed before the second intake valve. As a result, while the first intake valve is closed and the second intake valve is open, blow-through occurs in the second intake passage, so that the swirl flow can be maintained.
- the above-described engine intake device may include an introducing means for guiding a swirling flow in the cylinder into the second passage. With such a configuration, it is possible to improve the flow velocity of the airflow blown into the second passage. Thereby, the flow velocity of the swirling flow in the cylinder can be improved and the attenuation of the swirling flow can be suppressed.
- the introduction means may be a guide formed so that a swirling flow blows from the cylinder wall side to the second passage.
- the engine intake device includes a control valve that opens and closes the second intake passage on the second intake passage.
- the control valve has the first intake valve opened and the second intake valve opened.
- the valve can be closed during the open period, the first intake valve can be closed, and the second intake valve can be opened during the open period.
- the engine intake device further includes a second passage injection valve that injects fuel into the second intake passage, and the second passage injection valve injects fuel when the second intake valve is opened. It can be. With such a configuration, the fuel is injected in a direction that opposes the air blown into the second passage from the inside of the cylinder, so that atomization of the spray is promoted. Thereby, combustion efficiency can be improved.
- the engine intake device further includes a first passage injection valve that injects fuel into the first intake passage, and a second passage injection valve that injects fuel into the second intake passage.
- the passage injection valve finishes fuel injection before the first intake valve is opened, and the second passage injection valve injects fuel when the second intake valve is opened.
- the engine control device of the present invention can reduce pumping loss, suppress the attenuation of the swirling flow generated in the cylinder, promote the mixing of air and fuel, and form a stable combustion state.
- FIG. 6 is a cam characteristic diagram of a first intake cam, a second intake cam, and an exhaust cam. It is explanatory drawing which showed the flow of the air which generate
- FIG. 6 is an explanatory diagram showing a schematic configuration of a cylinder, a first intake passage, a second intake passage, and an exhaust passage in an intake device of Embodiment 3. It is explanatory drawing which showed the injection timing of the 1st injector and the 2nd injector.
- FIG. 1 is an explanatory view showing an intake device 10 of the present embodiment.
- FIG. 1A shows a front view of the intake device 10
- FIG. 1B shows a plan view of the intake device 10.
- the intake device 10 is a device that supplies fresh air to the cylinders 2 provided in the engine 1, and is provided for each cylinder.
- the engine 1 in this embodiment is a 4-valve 4-cylinder DOHC engine.
- a description will be given focusing on one of the cylinders 2.
- the cylinder 2 is formed in a cylinder head 3 and a cylinder block 4, and a piston 5 is accommodated in the cylinder 2 so as to be able to reciprocate.
- the intake device 10 includes two intake passages for supplying fresh air into the cylinder 2, a first intake passage 11, and a second intake passage 12.
- the first intake passage 11 and the second intake passage 12 are formed in the cylinder head 3.
- the first intake passage 11 and the second intake passage 12 branch from an intake manifold (not shown) and are connected to the cylinder 2 in parallel.
- a first intake valve 13 that opens and closes the first intake passage 11 is disposed at the opening of the first intake passage 11.
- a second intake valve 14 that opens and closes the second intake passage 12 is disposed at the opening of the second intake passage 12.
- the intake device 10 includes a first injector 26 for fuel injection in the first intake passage 11.
- the intake device 10 includes a guide 27 in the second intake passage 12. The guide 27 guides the swirling flow generated in the cylinder 2 into the second intake passage 12.
- the engine 1 is provided with an exhaust passage 6, which is branched into two passages and connected to the cylinders 2 respectively.
- Exhaust valves 7 for opening and closing the exhaust passage 6 are respectively disposed at the openings of the branched exhaust passage 6.
- the intake device 1 includes a first camshaft 15 and a second camshaft 16.
- a variable valve mechanism 17 is assembled to one end of the first camshaft 15. Gear teeth are formed on the outer periphery of the variable valve mechanism 17.
- a driven sprocket 18 is assembled to one end of the second camshaft 16.
- the outer periphery of the variable valve mechanism 17 and the driven sprocket 18 are connected to a drive sprocket (not shown) on the crankshaft side by a timing chain 19, and the rotation of the crankshaft is transmitted to the variable valve mechanism 17 and the driven sprocket 18. .
- the variable valve mechanism 17 includes a vane variable valve timing (VVT) controller provided with a hydraulic chamber. The VVT controller can advance and retard the first camshaft 15 by rotating the vane by adjusting the hydraulic pressure.
- VVT vane variable valve timing
- the second intake cam 20 is assembled to the first camshaft 15.
- the second intake cam 20 opens the second intake passage 12 by pushing down the second intake valve 14 via the rocker arm 21.
- a first intake cam 22 and two exhaust cams 24 are assembled to the second camshaft 16.
- the first intake cam 22 opens the first intake passage 11 by pushing down the first intake valve 13 via the roller rocker 23.
- the exhaust cam 24 opens the exhaust passage 6 by pushing down the exhaust valve 7 via the rocker arm 25.
- FIG. 2 is a cam characteristic diagram of the first intake cam 22, the second intake cam 20, and the exhaust cam 24.
- the first intake cam 22 is formed so that the valve lift starts on the advance side from the top dead center (360 °). It is more advanced than the dead point.
- the valve lift start timing of the second intake cam 20 is controlled by the VVT controller.
- the valve lift start timing of the second intake cam 20 can be made the same as the opening timing of the first intake valve 13 when moved to the advance side, and the top dead center when moved to the retard side. Rather than the retard side.
- the valve lift start of the second intake cam 20 is retarded from the top dead center.
- the second intake cam 20 is formed such that the operating angle of the second intake cam 20 is larger than the operating angle of the first intake cam 22. That is, the valve opening period of the second intake valve 14 is longer than the valve opening period of the first intake valve 13. As a result, the second intake valve 14 is closed at a later timing than the first intake valve 13.
- the second intake valve 14 is configured to close about 90 ° later than the first intake valve 13.
- the valve lift amount of the first intake valve 13 and the valve lift amount of the second intake valve 14 are different, and the valve lift amount of the first intake valve 13 is the valve lift of the second intake valve 14.
- a period larger than the lift amount is provided.
- the valve lift amount of the first intake valve 13 is larger than the valve lift amount of the second intake valve 14.
- first intake period the first intake valve 13 and the second intake valve 14 A period during which both valves are open
- second intake period a period during which the first intake valve 13 is closed and the second intake valve 14 is open
- intake period a period during which the first intake valve 13 is closed and the second intake valve 14 is open
- FIG. 3 is an explanatory diagram showing the flow of air generated in the cylinder 2 during the third intake period.
- FIG. 3A shows a case where the inside of the cylinder 2 is viewed from above, and
- FIG. 3B shows a cross section taken along the line AA in FIG.
- FIG. 3A also shows the state of the first intake passage 11 and the second intake passage 12, but the exhaust passage 6 is omitted.
- FIG. 3B also shows the state of the second intake passage 12 and the exhaust passage 6.
- first intake valve 13 is closed at the timing when the compression process starts, and the first intake valve 13 is closed.
- second intake valve 14 is still open after this, fresh air is introduced to the second intake passage 12 side. Blows through.
- the blow-through to the second intake passage 12 generates a counterclockwise swirling flow in the cylinder 2 as shown in FIGS. 3 (a) and 3 (b).
- the swirling flow generated during this period is short in the compression period of the air-fuel mixture after the second intake valve 14 is closed thereafter, so that the attenuation is small and the turbulence of the air-fuel mixture can be maintained until combustion.
- the guide 27 provided in the second intake passage 12 inhibits the airflow flowing from the first intake passage 11 side to the second intake passage 12 side, and travels from the outer peripheral side inside the cylinder 2 to the second intake passage 12. Only the air flow is easily flown into the second intake passage 12 to assist the swirling flow into the second intake passage 12. Thereby, the swirling flow in the cylinder 2 is further strengthened, and the turbulence of the air-fuel mixture is maintained even after the second intake valve 14 is closed. As described above, since the turbulence of the air-fuel mixture is maintained even after the second intake valve 14 is closed, the air-fuel mixture in the cylinder 2 becomes uniform and stable combustion is formed.
- the closing timing of the second intake valve 14 can be controlled by the VVT controller. For this reason, under conditions where the engine 1 is at a high rotation speed and a high load, the closing timing of the second intake valve 14 is set to an appropriate timing at which the swirling flow can be maintained by the VVT controller. Thereby, the engine 1 can ensure a high torque and high output state.
- the first intake valve 13 is closed during the intake stroke, the period during which the second intake valve 14 is closed, and the first intake valve 13 is closed. And a period during which the second intake valve 14 is open.
- a swirl flow along the inner peripheral wall in the cylinder 2 is generated during a period in which the first intake valve 13 is opened and the second intake valve 14 is closed during the intake stroke.
- the swirling flow blows through to the intake side during the period when the first intake valve 13 is closed and the second intake valve 14 is opened in the middle of the compression process. Since the swirl flow through the intake side is only in the second passage, the airflow in the cylinder is biased, and the swirl flow attenuation is suppressed.
- the expansion ratio becomes larger than the compression ratio, and the pumping loss is reduced.
- the pumping loss can be reduced, the attenuation of the swirling flow generated in the cylinder 2 can be suppressed, and the mixing of air and fuel can be promoted to form a stable combustion state. Thereby, EGR resistance increases and fuel consumption is improved.
- the intake device 30 of the present embodiment has substantially the same configuration as the intake device 10 of the first embodiment.
- the intake device 30 of the present embodiment differs from the intake device 10 of the first embodiment in that an intake control valve 31 that opens and closes the second intake passage 12 is provided on the second intake passage 12.
- the intake control valve 31 is closed during a period in which the first intake valve 13 is open and the second intake valve 14 is open, the first intake valve 13 is closed, and the second intake valve 14 is The valve is configured to open during the valve opening period.
- the intake device 30 Since the other configuration of the intake device 30 is the same as that of the intake device 10 of the first embodiment, the detailed description of the same components as those of the intake device 10 is omitted, and during the description of the present embodiment, Explanation will be made using the same reference numerals.
- FIG. 4 is an explanatory diagram showing the timing of opening and closing of the intake control valve 31.
- FIG. 4 is an explanatory diagram in which the opening / closing timing of the intake control valve 31 is added to FIG. 2 shown in the first embodiment.
- the intake control valve 31 closes almost simultaneously with the opening of the second intake valve 14 and opens at the timing when the first intake valve 13 closes.
- the intake control valve 31 is opened before the first intake valve 13 is closed in consideration of the time required for the air flow to occur after the valve is opened and closed. Further, the intake control valve 31 is open during a period other than the above.
- FIG. 5 is an explanatory view showing the flow of air generated in the cylinder 2.
- FIG. 5A shows a state where the second intake valve 14 is opened, but the intake control valve 31 is closed
- FIG. 5B shows the second intake valve 14 opened. The state when the intake control valve 31 is opened in the valved state is shown.
- the intake control valve 31 In the closing period of the intake control valve 31 in FIG. 4, the intake control valve 31 is closed simultaneously with the opening of the second intake valve 14, so that no air flows in the second intake passage 12. For this reason, during this period when the intake control valve 31 is closed, the air supplied into the cylinder 2 is limited to the first intake passage 11, and a drift occurs in the cylinder 2. ), The generation of the swirling flow is promoted. Thereafter, the intake control valve 31 is opened at the timing when the first intake valve 13 is closed, and air blown from the cylinder 2 into the second intake passage 12 occurs. Thus, the attenuation of the swirl flow is suppressed, and the turbulence of the air flow in the cylinder 2 increases. For this reason, even after the second intake valve 14 is closed, the turbulence of the airflow remains, and the air-fuel mixture diffuses to realize stable combustion. In the present embodiment, the same effect can be obtained even if the guide 27 is not provided.
- FIG. 6 is an explanatory view showing a schematic configuration of the cylinder 2, the first intake passage 11, the second intake passage 12, and the exhaust passage 6 in the intake device 40 of the present embodiment.
- the intake device 40 of the present embodiment has substantially the same configuration as the intake device 1 of the first embodiment.
- the intake device 40 according to the present embodiment differs from the intake device 10 according to the first embodiment in that the second intake passage 12 includes a second injector 41 for fuel injection. Since the other configuration of the intake device 40 is the same as that of the intake device 10 of the first embodiment, the detailed description of the same components as those of the intake device 10 is omitted, and during the description of the present embodiment, Explanation will be made using the same reference numerals.
- FIG. 7 is an explanatory view showing the injection timings of the first injector 26 and the second injector 41.
- FIG. 7 is an explanatory diagram in which the injection timings of the first injector 26 and the second injector 41 are added to FIG. 2 shown in the first embodiment.
- the first injector 26 performs the intake asynchronous injection, and finishes the fuel injection before the first intake valve 13 is opened.
- the second injector 41 performs intake synchronous injection and injects fuel when the second intake valve 14 is opened.
- the second injector 41 By providing the second injector 41 in this way, a part of the fuel injected by the first injector 26 when only the first injector 26 is provided can be injected by the second injector 41.
- the fuel injected from the second injector 41 faces the airflow that blows through the second intake passage 12, so that the fuel spray is atomized. For this reason, the vaporization of fuel is promoted, the intake air temperature is lowered, the volumetric efficiency is improved, and the output is improved. In the present embodiment, the same effect can be obtained even if the guide 27 is not provided.
- variable valve mechanism 17 may be configured such that the valve timing operating angle of the second intake valve 14 is variable. Further, a variable valve mechanism may be assembled to the second camshaft 16 so that the valve timing of the first intake valve 13 is variable. As a result, the intake air into the cylinder 2 can be controlled more flexibly, and the combustion efficiency can be improved.
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- 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)
- Valve Device For Special Equipments (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Description
2 気筒
6 排気通路
7 排気弁
10、30、40 吸気装置
11 第1吸気通路
12 第2吸気通路
13 第1吸気弁
14 第2吸気弁
15 第1カムシャフト
16 第2カムシャフト
17 可変動弁機構
18 ドリブンスプロケット
19 タイミングチェーン
20 第2吸気カム
21 ロッカーアーム
22 第1吸気カム
23 ローラーロッカー
26 第1インジェクタ
27 ガイド
31 吸気制御弁
41 第2インジェクタ
Claims (9)
- 気筒内へ新気を供給する第1吸気通路と、
前記第1吸気通路と並べて配置され、前記気筒内に新気を供給する第2吸気通路と、
前記第1吸気通路の開口部において前記第1吸気通路を開閉する第1吸気弁と、
前記第2吸気通路の開口部において前記第2吸気通路を開閉する第2吸気弁と、
を備え、
前記第1吸気弁の開弁時期が上死点よりも進角しているとともに、吸気行程において、前記第1吸気弁のバルブリフト量と前記第2吸気弁のバルブリフト量とが異なり、前記第1吸気弁のバルブリフト量が前記第2吸気弁のバルブリフト量よりも大きい期間を設けたことを特徴とするエンジンの吸気装置。 - 吸気行程前半において、前記第1吸気弁のバルブリフト量が前記第2吸気弁のバルブリフト量よりも大きいことを特徴とする請求項1記載のエンジンの吸気装置。
- 前記第1吸気弁が前記第2吸気弁より先に開弁することを特徴とした請求項1または2記載のエンジンの吸気装置。
- 前記第1吸気弁が前記第2吸気弁より先に閉弁することを特徴とした請求項1乃至3のいずれか一項記載のエンジンの吸気装置。
- 前記第2通路内へ筒内の旋回流を導く導入手段を備えたことを特徴とする請求項1乃至4のいずれか一項記載のエンジンの吸気装置。
- 前記導入手段は、気筒の壁側から前記第2通路へと旋回流が吹き込むように形成されたガイドであることを特徴とする請求項5記載のエンジンの吸気装置。
- 前記第2吸気通路上に前記第2吸気通路を開閉する制御弁を備え、
当該制御弁は、前記第1吸気弁が開弁し、前記第2吸気弁が開弁している期間において閉弁し、前記第1吸気弁が閉弁し、前記第2吸気弁が開弁している期間において開弁することを特徴とする請求項1乃至6のいずれか一項記載のエンジンの吸気装置。 - 前記第2吸気通路内に燃料を噴射する第2通路噴射弁を備え、当該第2通路噴射弁は、前記第2吸気弁の開弁時に燃料を噴射することを特徴とする請求項1乃至7のいずれか一項記載のエンジンの吸気装置。
- 前記第1吸気通路内に燃料を噴射する第1通路噴射弁と、
前記第2吸気通路内に燃料を噴射する第2通路噴射弁とを備え、
前記第1通路噴射弁は、前記第1吸気弁の開弁以前に燃料の噴射を終え、前記第2通路噴射弁は、前記第2吸気弁の開弁時に燃料を噴射することを特徴とする請求項1乃至7のいずれか一項記載のエンジンの吸気装置。
Priority Applications (4)
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US13/499,477 US9086021B2 (en) | 2009-11-05 | 2010-10-19 | Intake apparatus of engine |
JP2011539330A JP5218671B2 (ja) | 2009-11-05 | 2010-10-19 | エンジンの吸気装置 |
EP10828189.0A EP2497925B1 (en) | 2009-11-05 | 2010-10-19 | Intake apparatus of engine |
CN201080049925.5A CN102762841B (zh) | 2009-11-05 | 2010-10-19 | 发动机的进气装置 |
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JP2009253992 | 2009-11-05 | ||
JP2009-253992 | 2009-11-05 |
Publications (1)
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WO2011055629A1 true WO2011055629A1 (ja) | 2011-05-12 |
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PCT/JP2010/068319 WO2011055629A1 (ja) | 2009-11-05 | 2010-10-19 | エンジンの吸気装置 |
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US (1) | US9086021B2 (ja) |
EP (1) | EP2497925B1 (ja) |
JP (1) | JP5218671B2 (ja) |
CN (1) | CN102762841B (ja) |
WO (1) | WO2011055629A1 (ja) |
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JP5218671B2 (ja) | 2013-06-26 |
JPWO2011055629A1 (ja) | 2013-03-28 |
US9086021B2 (en) | 2015-07-21 |
EP2497925A4 (en) | 2013-12-04 |
CN102762841B (zh) | 2016-03-30 |
EP2497925A1 (en) | 2012-09-12 |
US20120210979A1 (en) | 2012-08-23 |
EP2497925B1 (en) | 2014-12-17 |
CN102762841A (zh) | 2012-10-31 |
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