WO2012063537A1 - 内燃機関の可変動弁装置 - Google Patents
内燃機関の可変動弁装置 Download PDFInfo
- Publication number
- WO2012063537A1 WO2012063537A1 PCT/JP2011/069470 JP2011069470W WO2012063537A1 WO 2012063537 A1 WO2012063537 A1 WO 2012063537A1 JP 2011069470 W JP2011069470 W JP 2011069470W WO 2012063537 A1 WO2012063537 A1 WO 2012063537A1
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- WIPO (PCT)
- Prior art keywords
- angle
- valve
- driven
- lift
- rotation
- Prior art date
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Classifications
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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
- 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
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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
- 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
- F01L1/356—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 making the angular relationship oscillate, e.g. non-homokinetic drive
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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
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
- F01L13/0021—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of rocker arm ratio
- F01L13/0026—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of rocker arm ratio by means of an eccentric
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/0203—Variable control of intake and exhaust valves
- F02D13/0215—Variable control of intake and exhaust valves changing the valve timing only
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- 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
- F01L2001/0471—Assembled camshafts
- F01L2001/0473—Composite camshafts, e.g. with cams or cam sleeve being able to move relative to the inner camshaft or a cam adjusting rod
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/047—Camshafts
- F01L1/053—Camshafts overhead type
- F01L2001/0537—Double overhead camshafts [DOHC]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/12—Other methods of operation
- F02B2075/125—Direct injection in the combustion chamber for spark ignition engines, i.e. not in pre-combustion chamber
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- the present invention relates to a variable valve operating apparatus for an internal combustion engine, and more particularly to a variable valve operating apparatus for an internal combustion engine that can change the rotational speed of a driven cam lobe during one rotation of a drive cam shaft.
- Patent Literature 1 discloses a valve operating apparatus for an internal combustion engine having a configuration in which a drive cam shaft to which a driven cam lobe for driving a valve is fixed is driven to rotate by an electric motor.
- the conventional valve gear includes a motor control device that controls the rotation speed of the electric motor. According to such a configuration, by changing the rotation speed of the electric motor by the motor control device, the rotation speed of the driven cam lobe during one rotation of the drive cam shaft can be increased or decreased.
- the applicant has recognized the following documents including the above-mentioned documents as related to the present invention.
- variable valve operating system adopts a general configuration in which the driving camshaft is driven by the rotational force of the crankshaft transmitted through the timing chain or belt.
- the driving camshaft is driven by the rotational force of the crankshaft transmitted through the timing chain or belt.
- control utilizing the above functions is performed. Is desirable.
- the present invention has been made to solve the above-described problems.
- the rotation of the driven cam lobe during one rotation of the drive camshaft. It is an object of the present invention to provide a variable valve operating apparatus for an internal combustion engine which can improve various performances of the internal combustion engine while realizing a function capable of changing the speed.
- the present invention is a variable valve operating apparatus for an internal combustion engine, and includes a drive camshaft, a driven cam lobe, a guide member, a link mechanism, contact maintaining means, an actuator, and control means.
- the drive camshaft is rotationally driven by the rotational force of the crankshaft.
- the driven cam lobe is concentric with the drive cam shaft and is rotatably supported by the drive cam shaft.
- the guide member has a raceway surface formed so as to cover the drive cam shaft.
- the link mechanism is connected to each of the drive cam shaft and the driven cam lob, and has a contact member that contacts the raceway surface, and the drive cam according to a change in the position of the contact member with respect to the rotation center of the drive cam shaft The rotation angle of the driven cam lobe relative to the shaft is changed.
- the contact maintaining means is configured to maintain contact between the contact member and the raceway surface that rotate around the drive cam shaft while the drive cam shaft rotates once.
- the actuator moves the track surface in a plane direction orthogonal to the axis of the drive cam shaft.
- the control means controls the control amount of the actuator so as to change the movement amount of the raceway surface in the planar direction according to the operating condition of the internal combustion engine.
- the position of the track surface on the plane is changed by moving the track surface in the plane direction orthogonal to the axis of the drive cam shaft by the actuator, and the link mechanism contacts the rotation center of the drive cam shaft.
- a change in position of the member occurs.
- the relative rotation angle of the driven cam lobe with respect to the drive cam shaft changes while the drive cam shaft makes one rotation.
- the rotational speed of the driven cam lobe changes during one rotation of the drive cam shaft in accordance with the control position of the raceway surface of the guide member.
- the present invention further includes a control means for controlling the control amount of the actuator so as to change the movement amount of the raceway surface in the plane direction according to the operating condition of the internal combustion engine.
- the relationship between each operating condition and the control amount of the actuator is determined in advance so that a desired lift curve characteristic (shape) can be obtained under each operating condition.
- various functions of the internal combustion engine can be improved satisfactorily while realizing the function of changing the rotational speed of the driven cam lobe during one rotation of the drive camshaft. .
- the actuator according to the present invention may rotationally drive the guide member.
- the raceway surface may be a circumferential surface, and may be provided in the guide member in a state where the center of the raceway surface is eccentric with respect to the rotation center of the guide member.
- the control amount of the actuator by the control means may be a rotation angle of the guide member. According to such a configuration, by using the actuator having a configuration in which the raceway surface having a center eccentric with respect to the rotation center of the guide member is moved in the plane direction by rotating the guide member, the opening member By controlling the rotation angle, it is possible to realize a variable valve operating device that can change the rotation speed of the driven cam lobe during one rotation of the drive cam shaft. According to the above configuration, when the rotation angle of the guide member, which is the control amount of the actuator, is changed, the same or substantially the same working angle value is obtained, and the lift amount is First and second lift curves having different timings indicating peaks can be obtained.
- control means in the present invention may include at least a first rotation angle and a second rotation angle as a target value of the rotation angle of the guide member.
- the first rotation angle may be a rotation angle of the guide member when a working angle value of a valve driven by the driven cam lobe is obtained as a predetermined working angle value.
- the second rotation angle is the same as or substantially the same as the operation angle value obtained when controlling to the first rotation angle, and is obtained when controlling to the first rotation angle.
- the rotation angle of the guide member when a second lift curve having a timing at which the lift amount reaches a peak compared to the first lift curve of the valve to be obtained may be obtained.
- the said control means may use a said 1st rotation angle and a said 2nd rotation angle selectively under the at least 2 types of driving conditions from which an engine speed differs.
- the same or substantially the same working angle value can be obtained as compared with the conventional variable valve gear that can obtain only one characteristic (shape) lift curve for one working angle.
- the valve in the present invention may be an intake valve.
- the second lift curve may be set so that the timing at which the lift amount reaches a peak is retarded as compared to the first lift curve.
- the said control means may use a said 2nd rotation angle on the driving
- the timing at which the amount of air easily enters the cylinder during the lift section changes according to the engine speed. More specifically, as the engine speed increases, the timing becomes relatively late.
- the intake valve lift amount can be secured high at a timing at which a large amount of air easily enters in the lift section regardless of the engine speed. Will be able to. For this reason, the output performance of the internal combustion engine can be improved.
- the second lift curve in the present invention may be set such that the lift amount in a predetermined section near the valve closing timing is lower than that of the first lift curve. As a result, when the second lift curve is used, it is possible to prevent the in-cylinder charged air amount from being reduced due to the influence of the blow back of the intake air.
- the valve driven by the driven cam lobe in the present invention may be an intake valve.
- the control means increases the relative rotational speed of the driven cam lobe with respect to the drive camshaft in a predetermined section near the opening timing of the intake valve.
- the control amount of the actuator may be controlled. According to such a configuration, when an acceleration request is issued at a low engine speed, a sufficient clearance between the piston and the intake valve can be secured in a predetermined section near the opening timing of the intake valve. As a result, the opening timing of the intake valve can be advanced more greatly, and the valve overlap amount with the exhaust valve can be effectively increased.
- the scavenging effect is improved by increasing the valve overlap amount.
- the output performance of the internal combustion engine can be improved.
- the intake pressure is lower than the exhaust pressure during acceleration, the internal EGR gas amount increases due to the expansion of the valve overlap amount. As a result, the fuel efficiency performance and exhaust emission performance of the internal combustion engine can be improved.
- the control means according to the present invention may be configured such that when the engine speed is higher than a predetermined speed, the driven cam lobe is relative to the drive cam shaft in a predetermined section near a closing timing of a valve driven by the driven cam lobe.
- the control amount of the actuator may be controlled so as to reduce the rotational speed.
- FIG. 2 is a view for explaining a configuration around a drive cam shaft provided in the intake variable valve operating apparatus shown in FIG. 1.
- FIG. 3 is a cross-sectional view of the variable intake valve operating device shown in FIG. 1 taken along line AA shown in FIG.
- FIG. 3 is a perspective view of a configuration around a drive cam shaft from the direction of arrow B in FIG. 2.
- it is a diagram illustrating the operation of the link mechanism during the rotation of the drive cam shaft (mainly, the change in the rotation angle ⁇ during one rotation of the drive cam shaft).
- times It is a figure showing the tendency of the change of the valve opening characteristic of an intake valve with the change of eccentric angle (phi) in an intake variable valve operating apparatus. It is a figure showing each lift curve of the intake valve obtained when the eccentric angle ⁇ is changed by 90 °. It is a figure showing the relationship between the lift area of an intake valve, and the acceleration / deceleration area. It is a figure showing the relationship between each lift curve and eccentric angle (phi) of the intake valve changed according to the operating condition of an internal combustion engine in Embodiment 1 of this invention. It is a flowchart of the routine performed in Embodiment 1 of the present invention.
- FIG. 1 is a diagram for explaining a system configuration of an internal combustion engine 10 on which variable valve operating apparatuses 34 and 36 according to the present invention are mounted.
- the internal combustion engine 10 is assumed to be an in-line four-cylinder engine having four cylinders (# 1 to # 4).
- a piston 12 In the cylinder of the internal combustion engine 10, a piston 12 is provided. A combustion chamber 14 is formed in the cylinder of the internal combustion engine 10 on the top side of the piston 12. An intake passage 16 and an exhaust passage 18 communicate with the combustion chamber 14. An air flow meter 20 that outputs a signal corresponding to the flow rate of air sucked into the intake passage 16 is provided in the vicinity of the inlet of the intake passage 16.
- a compressor 22a of the turbocharger 22 is disposed in the intake passage 16 downstream of the air flow meter 20 in the intake passage 16 downstream of the air flow meter 20, a compressor 22a of the turbocharger 22 is disposed. Further, a turbine 22 b of the turbocharger 22 is disposed in the exhaust passage 18. An electronically controlled throttle valve 24 is provided in the intake passage 16 downstream of the compressor 22a.
- Each cylinder of the internal combustion engine 10 is provided with a fuel injection valve 26 for directly injecting fuel into the combustion chamber 14 (inside the cylinder) and an ignition plug 28 for igniting the air-fuel mixture. .
- the intake port and the exhaust port are respectively provided with an intake valve 30 and an exhaust valve 32 for bringing the combustion chamber 14 and the intake passage 16 or the combustion chamber 14 and the exhaust passage 18 into a conductive state or a cut-off state.
- the intake valve 30 and the exhaust valve 32 are driven by an intake variable valve operating device 34 and an exhaust variable valve operating device 36, respectively.
- the detailed configuration and operation of these variable valve gears 34 and 36 will be described later with reference to FIGS.
- the system shown in FIG. 1 includes an ECU (Electronic Control Unit) 40.
- the input angle of the ECU 40 includes a crank angle sensor 38 for detecting the engine speed, and an accelerator opening for detecting the accelerator opening of the vehicle on which the internal combustion engine 10 is mounted.
- Various sensors for detecting the operation state of the internal combustion engine 10 such as the sensor 42 are connected.
- various actuators for controlling the operation of the internal combustion engine 10 such as the throttle valve 24, the fuel injection valve 26, the spark plug 28, and the variable valve operating devices 34, 36 are connected to the output portion of the ECU 40. Yes.
- the ECU 40 controls the operating state of the internal combustion engine 10 by driving the various actuators according to a predetermined program based on the sensor outputs.
- variable valve gears 34 and 36 will be described in detail with reference to FIGS.
- the intake variable valve operating apparatus 34 will be described as an example, but the exhaust variable valve operating apparatus 36 is basically the same as the intake variable valve operating apparatus 34 except for the cam profile of the driven cam lobe. It shall be configured.
- FIG. 2 is a perspective view schematically showing the overall configuration of the intake variable valve operating apparatus 34 shown in FIG.
- FIG. 3 is a view for explaining a configuration around the drive cam shaft 44 provided in the intake variable valve operating apparatus 34 shown in FIG.
- the intake variable valve operating apparatus 34 includes a drive cam shaft 44.
- the drive camshaft 44 is connected to a crankshaft (not shown) via a timing pulley 46, a timing chain and the like (not shown), and is configured to rotate at a half speed of the crankshaft.
- a known variable valve timing (VVT) mechanism 48 is provided between the drive camshaft 44 and the timing pulley 46 so that the rotational phase of the drive camshaft 44 can be changed with respect to the rotation of the crankshaft. is doing.
- VVT variable valve timing
- the opening timing and the closing timing are changed to the advance side or the retard side with reference to the crank angle without changing the operating angle of the intake valve 30. can do.
- a cam piece 50 is attached to the drive camshaft 44 for each cylinder.
- the cam piece 50 is concentric with the drive cam shaft 44 and is rotatably supported by the drive cam shaft 44.
- the cam piece 50 is formed with two driven cam lobes 50 a for driving the intake valve 30.
- the driven cam lobe 50a includes an arc-shaped base circle portion 50a1 coaxial with the drive cam shaft 44, and a nose portion 50a2 formed so as to bulge a part of the base circle outward in the radial direction.
- the drive cam shaft 44 is provided with a drive arm 52 having a drive arm portion 52a that protrudes radially outward of the drive cam shaft 44 for each cylinder.
- the drive arm 52 is integrally fixed to the drive camshaft 44 using a predetermined fixing member (not shown).
- the cam piece 50 is integrally formed with a driven arm portion 50b protruding outward in the radial direction of the drive cam shaft 44 in the vicinity of the driven cam lobe 50a closer to the drive arm 52 for the same cylinder.
- FIG. 4 is a cross-sectional view of the intake variable valve operating apparatus 34 shown in FIG. 1 cut along line AA shown in FIG.
- FIG. 5 is a perspective view of the configuration around the drive cam shaft 44 from the direction of arrow B in FIG.
- illustration of the control sleeve 70 is abbreviate
- one end of a drive link 56 is rotatably connected to the drive arm portion 52 a via a cam shaft side rotation shaft 54.
- one end of a driven link 60 is rotatably connected to the driven arm portion 50b via a cam lobe side rotating shaft 58.
- the other end of the drive link 56 and the other end of the driven link 60 are connected via a control roller side rotating shaft 62.
- a control roller 64 and a link plate 66 are interposed between the drive link 56 and the driven link 60 on the control roller side rotation shaft 62.
- the intake variable valve operating apparatus 34 of the present embodiment includes the drive arm portion 52a and the driven arm portion 50b having the shaft center of the drive cam shaft 44 as a common rotation center, the drive link 56, and the driven link 60.
- a link mechanism 68 that is a four-bar link connected in a pantograph shape (diamond shape) is provided.
- the driven link 60 is forward of the drive cam shaft 44 in the rotational direction with respect to the drive link 56 with the control roller 64 interposed between the driven link 56 and the driven link 60. Arranged on the side.
- the link plate 66 is formed by bending two annular plate portions so as to be concentric.
- the link plate 66 is disposed on the control roller-side rotation shaft 62 in a state where the drive cam shaft 44 passes through the link plate 66 and the control roller 64 is sandwiched from the outside.
- a raceway surface 70a of the control sleeve 70 is disposed on the outer peripheral side of the link plate 66 so as to further cover the link plate 66 through which the drive cam shaft 44 penetrates.
- the track surface 70a of the present embodiment is constituted by a circumferential surface.
- the control roller 64 is rotatably supported by the control roller side rotation shaft 62 at a position in contact with the track surface 70a so that the control roller 64 can roll on the track surface 70a in conjunction with the rotation of the drive cam shaft 44. .
- two holding rollers 72 are rotatably attached to the inner side of the link plate 66 via holding rotary shafts 74 at positions in contact with the track surface 70a. It has been. More specifically, in addition to the control roller 64, these three rollers 64 and 72 including the two holding rollers 72 are arranged at equiangular intervals around the drive cam shaft 44. 64 and 72 are attached to the link plate 66. According to such a configuration, as the drive cam shaft 44 rotates, the link roller 66 rotates inside the raceway surface 70a while the control roller 64 and the two holding rollers 72 roll on the raceway surface 70a. become.
- the radial position of the drive cam shaft 44 is defined by the raceway surface 70a via the control roller 64 and the holding roller 72, and the control roller attached to the link plate 66 64 positions on the track surface 70a are defined.
- the control roller 64 rolls on the track surface 70a with the rotation of the drive cam shaft 44 in a state where the control roller 64 is always in contact with the track surface 70a.
- the relative rotation angle ⁇ of the driven cam lobe 50a with respect to the drive cam shaft 44 is also specified via the drive link 56 and the driven link 60.
- the rotation angle ⁇ is a straight line (drive) connecting the center point of the drive cam shaft 44 and the center point of the cam shaft side rotation shaft 54 when viewed from the axial direction of the drive cam shaft 44.
- Axis and a straight line (driven shaft) connecting the center point of the drive cam shaft 44 and the center point of the cam lobe side rotation shaft 58 is defined.
- the intake variable valve operating apparatus 34 of the present embodiment includes an actuator 76 for driving the control sleeve 70 to rotate.
- the raceway surface 70 a is formed inside the control sleeve 70 in a state where the center point of the raceway surface 70 a is eccentric with respect to the rotation center of the control sleeve 70 when viewed from the axial direction of the drive cam shaft 44. Is formed. Therefore, when the control sleeve 70 is rotated by the actuator 76 around the rotation center, the center point of the track surface 70a draws a circular track as shown by a broken line in FIG.
- control sleeve 70 and the drive sleeve are driven so that the rotation center of the drive cam shaft 44 is positioned on the locus of the center point of the raceway surface 70a when viewed from the axial direction of the drive cam shaft 44.
- a relative positional relationship with the cam shaft 44 is set.
- the control sleeve 70 described above is disposed in each cylinder of the internal combustion engine 10 as shown in FIG.
- a gear 70b is formed on the outer periphery of each control sleeve 70 (only a part of the gear 70b is shown in FIG. 4 and FIG. 6 described later).
- the intake variable valve operating apparatus 34 includes a control shaft 78 in parallel with the drive cam shaft 44 in the vicinity of the outer periphery of the control sleeve 70.
- gears 78 a that mesh with the gears 70 b of the control sleeves 70 are provided.
- a gear 78b different from the gear 78a is formed at one end of the control shaft 78.
- the gear 78b of the control shaft 78 is meshed with a gear 80b formed at the tip of the output shaft 80a of an electric motor (hereinafter simply referred to as “motor”) 80.
- the control sleeve 70 is assumed to be rotatably supported by a cam housing (support member) (not shown) using a predetermined fixing member (not shown).
- the control shaft 78 is also supported rotatably by the cam housing.
- the motor 80 is driven based on a command from the ECU 40 provided in the internal combustion engine 10.
- the actuator 76 includes the gear 70b formed on the control sleeve 70, the control shaft 78 connected to the control sleeve 70 via the gear 70b and the gear 78a, and the gear 78b and the gear 80b.
- the motor 80 is connected to the control shaft 78.
- the rotational position of the control sleeve 70 is adjusted by adjusting the rotational position of the control shaft 78 using the motor 80 based on a command from the ECU 40, and as a result, the drive
- the amount of eccentricity between the rotation center of the cam shaft 44 and the center of the raceway surface 70a can be adjusted.
- the “eccentric angle ⁇ ” is used as an index for specifying the amount of eccentricity and the direction of eccentricity between the rotation center of the drive cam shaft 44 and the center of the raceway surface 70a.
- the eccentric angle ⁇ is a straight line from the rotation center of the control sleeve 70 to the rotation center of the drive cam shaft 44 as viewed from the axial direction of the drive cam shaft 44, and the rotation of the control sleeve 70. It is defined as the angle formed by a straight line from the center toward the center point of the track surface 70a.
- the eccentric angle ⁇ is 0 °.
- the eccentric angle ⁇ increases as the center point of the raceway surface 70a rotates counterclockwise greatly on the locus as the amount of rotation of the control sleeve 70 in the counterclockwise direction in FIG. 4 increases. Is defined as Further, in the state shown in FIG. 4 (that is, in a state where the center point of the raceway surface 70a is symmetrical with the rotation center of the drive cam shaft 44 with respect to the vertical line passing through the rotation center of the control sleeve 70). ⁇ is 180 °. The amount of eccentricity between the rotation center of the drive cam shaft 44 and the center point of the raceway surface 70a becomes maximum when the eccentric angle ⁇ is 180 °.
- a rocker arm 82 is arranged for each intake valve 30 below each driven cam lobe 50a of each cylinder.
- a rocker roller 82a in contact with the driven cam lobe 50a is rotatably attached to the central portion of the rocker arm 82.
- One end of the rocker arm 82 is supported by the valve shaft of the intake valve 30, and the other end of the rocker arm 82 is rotatably supported by a hydraulic lash adjuster 84.
- the intake valve 30 is urged by a valve spring 86 in a closing direction, that is, a direction in which the rocker arm 82 is pushed up.
- FIG. 6 is a diagram illustrating the operation of the link mechanism 68 during the rotation of the drive cam shaft 44 (mainly, the change in the rotation angle ⁇ during one rotation of the drive cam shaft 44) as an example. More specifically, FIG. 6 is a diagram showing the operation of the link mechanism 68 when the raceway surface 70a is in the same eccentric state as in FIG. 4 (the state where the eccentric angle ⁇ is 180 °).
- each element of the link mechanism 68 and the driven cam lobe 50a rotate in the same direction as the drive cam shaft 44.
- the control roller 64 rolls on the raceway surface 70 a while being always in contact with the raceway surface 70 a at the contact point P, and rotates around the drive cam shaft 44.
- the raceway surface 70a is a circumferential surface as described above. Therefore, if the center point of the raceway surface 70a coincides with the rotation center of the drive cam shaft 44 (when the eccentric angle ⁇ is 0 °), the drive is different from the eccentric state as shown in FIG. While the control roller 64 makes one rotation on the raceway surface 70 a with the rotation of the cam shaft 44, there is no change in the distance between the rotation center of the drive cam shaft 44 and the rotation center of the control roller 64. There is no change in the relative rotation angle ⁇ of the driven cam lobe 50a. Therefore, in this case, the driven cam lobe 50a makes one rotation at a constant speed with the drive cam shaft 44.
- acceleration section the section from the point P2 to the point P1 on the track surface 70a is simply referred to as “acceleration section”, and the section from the point P1 to the point P2 on the track surface 70a is It is simply referred to as “deceleration section”.
- FIG. 7 is a schematic diagram for explaining the operation of the intake variable valve operating apparatus 34 when the eccentric angle ⁇ is changed by 90 °.
- FIG. 8 is a diagram showing a change tendency of the valve opening characteristic of the intake valve 30 in accordance with the change of the eccentric angle ⁇ in the intake variable valve operating apparatus 34. More specifically, FIG. 8A shows the tendency of the change in the operating angle of the intake valve 30 with the change in the eccentric angle ⁇ , and FIG. 8B shows the change in the eccentric angle ⁇ . It is a figure showing the tendency of the change of the opening timing of the intake valve 30 with it.
- FIG. 9 is a diagram showing each lift curve of the intake valve 30 obtained when the eccentric angle ⁇ is changed by 90 °. Each drawing in FIG.
- the operation state shown in FIG. 7A is a state where the eccentric angle ⁇ is 0 °, that is, a state where the rotation center of the drive cam shaft 44 and the center of the track surface 70a coincide.
- the driven cam lobe 50a makes one rotation with the drive cam shaft 44 at a constant speed.
- the operating angle of the intake valve 30 obtained in this case is hereinafter referred to as “OA1” as shown in FIG.
- the driven cam lobe is a general value (a crank angle that is a predetermined amount larger than 180 °), the driven cam lobe
- the period during which the nose portion 50a2 of the 50a presses the rocker roller 82a is a value obtained by adding a half value of the predetermined amount to 90 ° in terms of the cam angle.
- the control roller 64 in the lift section of the intake valve 30 almost passes through the speed increasing section. Therefore, the operating angle of the intake valve 30 in the operation state shown in FIG. 7B is smaller than that in the constant speed state shown in FIG. 7A, as shown in FIGS.
- the drive camshaft 44 in a situation where the lift section of the intake valve 30 and the acceleration section of the control roller 64 overlap.
- the operating angle of the intake valve 30 gradually decreases as the amount of eccentricity between the rotation center and the rotation center of the raceway surface 70a increases.
- the tendency of the change in the operating angle of the intake valve 30 accompanying the change in the eccentric angle ⁇ is made by the setting of each component of the intake variable valve operating device 34 (the driven cam lobe 50a and the driven arm portion 50b (driven shaft)). It changes depending on the angle or the ratio of the lengths of the links of the link mechanism 68).
- the contact point P of the control roller 64 rotates at a timing when the opening timing of the intake valve 30 arrives, which is larger than the rotation angle ⁇ 0 at the time of the equal rotation angle point P0. It is located in the section where the angle ⁇ is small. For this reason, the opening timing of the intake valve 30 in this operating state is a value on the retard side of the value at the constant speed, as shown in FIG. 8B and FIG. Further, in the setting of the intake variable valve operating apparatus 34, when the eccentric angle ⁇ is changed from 0 ° to 90 °, the opening timing of the intake valve 30 is changed as shown in FIG. The retardation amount of increases once and then decreases.
- the contact point P of the control roller 64 rotates at a timing when the opening timing of the intake valve 30 arrives, which is smaller than the rotation angle ⁇ 0 at the narrow rotation angle point P0. It is located in the section where the angle ⁇ becomes large. For this reason, the opening timing of the intake valve 30 in this operating state is a value on the advance side with respect to the value at the constant speed, as shown in FIGS. Further, in the case of setting of the intake variable valve operating apparatus 34, when the eccentric angle ⁇ is changed from 90 ° to 180 °, as shown in FIG. The amount of advance of is gradually increased.
- FIG. 7D This operation state is obtained by further rotating the control sleeve 70 in the counterclockwise direction in FIG. 7 by 90 ° with respect to the operation state shown in FIG.
- the operation state is as shown in FIG. That is, the control roller 64 in the lift section of the intake valve 30 is located in the acceleration section at the beginning of the lift, but mainly passes through the deceleration section. Therefore, the operating angle of the intake valve 30 in the operation state shown in FIG. 7D is larger than that in the constant speed state shown in FIG.
- the eccentric angle ⁇ when the eccentric angle ⁇ is changed from 180 ° to 270 °, the proportion of the deceleration zone in the lift zone of the intake valve 30 increases. In this way, the operating angle of the intake valve 30 gradually increases.
- the eccentric angle ⁇ when the eccentric angle ⁇ is a value near 270 °, the operating angle of the intake valve 30 is the intake variable operation.
- a maximum operating angle OAmax within a variable range of the operating angle in the valve device 34 is obtained.
- the contact point P of the control roller 64 rotates at a timing when the opening timing of the intake valve 30 arrives, which is smaller than the rotation angle ⁇ 0 at the narrow rotation angle point P0. It is located in the section where the angle ⁇ becomes large. For this reason, the opening timing of the intake valve 30 in this operation state is a value on the advance side with respect to the value at the constant speed, as in the case of 180 °, as shown in FIGS. Become. Further, in the setting of the intake variable valve operating apparatus 34, when the eccentric angle ⁇ is changed from 180 ° to 270 °, the opening timing of the intake valve 30 is changed as shown in FIG. The advance angle amount of increases once and then decreases.
- the control sleeve 70 having the raceway surface 70a whose center is eccentric with respect to the rotation center of the control sleeve 70 is rotationally driven to set the eccentric angle ⁇ .
- the distance between the rotation center of the drive cam shaft 44 and the rotation center of the control roller 64 changes.
- the relative rotation angle ⁇ of the driven cam lob 50a with respect to the drive cam shaft 44 changes while the drive cam shaft 44 makes one rotation.
- the revolution center of the control roller 64 that revolves around the drive cam shaft 44 is changed by rolling along the raceway surface 70a.
- the drive cam shaft 44 is rotated once in accordance with the control position of the raceway surface 70a (the rotation angle of the control sleeve 70) accompanying the adjustment of the eccentric angle ⁇ by the actuator 76.
- the rotational speed of the driven cam lobe 50 a can be continuously increased or decreased with respect to the rotational speed of the drive cam shaft 44.
- the operating angle of the intake valve 30 can be continuously varied according to the control position of the raceway surface 70a, as shown in FIGS.
- the opening timing of the intake valve 30 can be arbitrarily set from the value obtained by controlling the eccentric angle ⁇ by using the VVT mechanism 48 in addition to controlling the eccentric angle ⁇ . It is also possible to adjust the timing.
- the operating angle of the intake valve 30 can be continuously varied in the following characteristic manner. More specifically, when the control sleeve 70 is rotated in one direction, the operating angle of the intake valve 30 increases after decreasing, and then decreases, so that the operating angle is reduced. And in both directions of enlargement.
- the intake variable valve operating apparatus 34 when the control sleeve 70 is rotated in one direction and the eccentric angle ⁇ is continuously changed, the timing is increased at any timing during the lift section. Whether the speed / deceleration section arrives gradually differs, and the acceleration / deceleration amount also gradually differs.
- the control sleeve 70 for varying the operating angle is not limited to being driven in one predetermined direction, and may be driven in both directions (reciprocating direction) as necessary. .
- the center of rotation of the drive camshaft 44 is positioned on the track of the track surface 70a when the control sleeve 70 is rotated, with the track surface 70a being a circumferential surface.
- the relative positional relationship between the control sleeve 70 and the drive cam shaft 44 is set.
- effects that can be achieved based on the configuration of the intake variable valve operating apparatus 34 include the following.
- the spring reaction force from the valve spring 86 acts on the link mechanism 68 that rotates around the drive cam shaft 44 via the driven cam lobe 50a.
- This spring reaction force acts in the radial direction of the control sleeve 70 via the control roller 64 and the raceway surface 70a.
- the inertia force from the link mechanism 68 accompanying the rotation of the drive cam shaft 44 acts on the raceway surface 70 a via the control roller 64 in the radial direction of the control sleeve 70.
- the direction in which the control sleeve 70 is operated to change the operating angle of the intake valve 30 is different from the operating direction (radial direction) of the spring reaction force and the like. This is the rotational direction (circumferential direction) of the control sleeve 70. Therefore, even if the control sleeve 70 is rotationally driven in a direction against the circumferential component force such as the spring reaction force, the actuator 76 for rotationally driving the control sleeve 70 to change the operating angle.
- the load torque is a small torque based on a circumferential component force. For this reason, according to the intake variable valve operating apparatus 34, it is possible to greatly reduce the load torque acting on the actuator 76.
- the control roller 64 is employed as a contact member that comes into contact with the raceway surface 70a to roll on the raceway surface 70a. For this reason, as compared with the case where a member that makes contact with the raceway surface 70a using sliding is adopted as the contact member, friction and wear of the contact portion can be reduced. Further, in the intake variable valve operating apparatus 34 of the present embodiment, the control roller 64 is interposed between the drive arm 52a and the drive link 56 not on the rear side in the rotation direction of the drive cam shaft 44 but on the front side. The driven link 60 is arranged in the state.
- the force acting on the drive link 56 and the driven link 60 due to the spring reaction force of the valve spring 86 is not a tensile force or a bending force but a compressive force. Therefore, the deformation and stress of the drive link 56 and the driven link 60 can be reduced, and the position of the control roller 64 (the rotation angle ⁇ between the drive cam shaft 44 and the driven cam lobe 50a) can be determined more reliably. .
- FIG. 10 is a diagram showing the relationship between the lift section of the intake valve 30 and the acceleration / deceleration section. More specifically, the relationship shown in FIG. 10 is such that the center point of the raceway surface 70a is away from the center of rotation of the drive camshaft 44 (the raceway surface 70a is controlled to an eccentric angle ⁇ other than 0 °). State).
- the vertical axis in FIG. 10 represents the amount of change in the rotation angle ⁇ during one rotation of the drive cam shaft 44 (the rotation speed (angular velocity) of the driven cam lobe 50a based on the rotation speed (constant velocity) of the drive cam shaft 44). Equivalent to the change in
- the position (movement range) of the control roller 64 on the raceway surface 70a in relation to the lift section of the intake valve 30 is the mounting angle between the driven cam lobe 50a and the driven arm portion 50b (driven shaft) on the cam piece 50. It can be changed by adjusting etc. As a result, as exemplified in FIG. 10 as three cases, the setting of the relationship between the lift section and the acceleration / deceleration section can be changed.
- the pantograph-like link mechanism 68 determines the amount of acceleration / deceleration of the driven cam lobe 50a during one rotation of the drive cam shaft 44.
- the lift curve of the intake valve 30 is determined depending on which part in the lift section is subjected to acceleration / deceleration. More specifically, the factors that determine the acceleration / deceleration amount of the driven cam lobe 50a are the length of the side of each link of the link mechanism 68 and the amount of eccentricity between the rotation center of the drive cam shaft 44 and the center of the raceway surface 70a ( The amount of movement of the track surface 70a in the plane direction orthogonal to the axis of the drive cam shaft 44).
- the factors that determine the setting of the relationship between the lift section and the acceleration / deceleration section are the ratio of the side length of each link of the link mechanism 68 and the locus of the center point of the track surface 70a in addition to the above-mentioned attachment angle. (FIG. 4 etc.). 4 or the like, the driven cam lobe 50a is positioned on the front side in the rotational direction of the drive camshaft 44 with respect to the drive camshaft 44, or the driven cam lobe 50a is reversed. Depending on whether it is located on the rear side, the acceleration / deceleration section of the driven cam lobe 50a is reversed while the drive camshaft 44 makes one rotation.
- FIG. 11 is a diagram showing the relationship between each lift curve of intake valve 30 and the eccentric angle ⁇ , which is changed according to the operating conditions of internal combustion engine 10 in the first embodiment of the present invention.
- the intake variable valve operating apparatus 34 having the configuration described above, the lift speed at each timing in the lift section changes by rotating the control sleeve 70 to change the eccentric angle ⁇ .
- the operating angle of the intake valve 30 can be changed while changing the timing at which the lift amount shows a peak (hereinafter, sometimes simply referred to as “lift peak timing”).
- the intake variable valve operating apparatus 34 includes a raceway surface 70a whose center is eccentric with respect to the rotation center of the control sleeve 70 that is rotationally driven by the actuator 76, and the pantograph-like link mechanism 68 by the raceway surface 70a. The rolling of the control roller 64 is guided.
- the operating angle of the intake valve 30 is varied in both the reduction direction and the enlargement direction as shown in FIG.
- the operating angle of the intake valve 30 can be continuously varied.
- the eccentric angle ⁇ is changed according to the operating condition of the internal combustion engine 10, as shown in FIG.
- the lift curves of the intake valves 30 having different lift peak timings are used according to the situation.
- the eccentric angle ⁇ is the control amount of the actuator 76.
- the lift curve when the eccentric angle ⁇ is 0 ° is obtained when the driven cam lobe 50a rotates at the same speed as the drive cam shaft 44.
- the lift peak timing of the lift curve obtained in this case is closer to the closing side than the center of the valve opening period (lift section) (at the time of the first high engine speed).
- the profile of the driven cam lobe 50a is set so that the intake air flow rate can be increased efficiently.
- 180 ° is selected as the eccentric angle ⁇ when the engine speed is low (excluding when acceleration is requested), which is equal to or lower than the first predetermined speed NE1.
- the eccentric angle ⁇ is 180 °, as described above, the first half of the lift section is subjected to the speed increasing action, and the latter second half is subjected to the speed reducing action.
- the lift peak timing of the lift curve obtained in this case moves to the open side compared to the case where the eccentric angle ⁇ is 0 °, and is almost in the middle of the valve opening period (slightly closed). Timing from the side).
- the speed increasing action and the speed reducing action are canceled out as a whole during the valve opening period, and the operating angle of the intake valve 30 is the same as when the eccentric angle ⁇ is 0 ° (at the constant speed). It becomes the same value OA1.
- the eccentric angle ⁇ when an acceleration request (high load request) is issued during the low engine rotation, the eccentric angle ⁇ is changed from 180 ° to 210 ° (an example).
- the rotational speed of the driven cam lobe 50a is relatively reduced at the beginning of the lift of the intake valve 30 compared to when the eccentric angle ⁇ is 180 °.
- the lift amount in a predetermined section near the opening timing of the intake valve 30 is lower than when the eccentric angle ⁇ is 180 °.
- the lift peak timing is moved to the closing side and the operating angle is increased (OA2).
- the eccentric angle ⁇ is 320. ° (example) was selected.
- the eccentric angle ⁇ is 320 °, compared with the case where the eccentric angle ⁇ is 0 °, the driven portion is driven substantially in the entire lift section including the predetermined section (the ramp portion on the closing side) near the closing timing of the intake valve 30.
- the rotational speed of the cam lobe 50a is reduced.
- the lift peak timing moves to the closing side, and the working angle increases (OA3).
- FIG. 12 is a flowchart showing a control routine executed by the ECU 40 in order to realize the control of the intake variable valve operating apparatus 34 according to the operating conditions of the internal combustion engine 10. This routine is repeatedly executed every predetermined control cycle.
- the current engine speed is higher than the first predetermined speed NE1 and equal to or lower than the second predetermined speed NE2 (> first predetermined speed NE1). It is determined whether or not the first high engine is rotating (step 100). As a result, when it is determined that the engine speed is the first high engine speed, 0 ° is used as the eccentric angle ⁇ (step 102).
- step 100 if it is determined in step 100 that the engine speed is not the first high engine speed, it is determined whether the current engine engine speed is a low engine engine speed that is equal to or lower than the first predetermined engine speed NE1. (Step 104). As a result, when it is determined that the engine speed is low, the accelerator opening degree detected by the accelerator opening sensor 42 next determines whether or not there is an acceleration request (high load request) from the driver. A determination is made based on this (step 106).
- step 106 When the determination in step 106 is not established, that is, at the time of low engine speed at which no acceleration request is issued, 180 ° is used as the eccentric angle ⁇ (step 108). On the other hand, when the determination in step 106 is established, that is, when it is determined that there is an acceleration request at the low engine speed, 210 ° is used as the eccentric angle ⁇ (step 110).
- step 104 determines whether or not the current engine speed is higher than the second predetermined speed NE2 (step 112).
- 320 ° is used as the eccentric angle ⁇ (step 114).
- the second predetermined speed NE2 is set in advance as a threshold value that can be used to determine whether the current engine speed is an engine speed that can ensure normal motility of the variable intake valve operating device 34 when the engine speed is high. Value. Further, the processing in step 114 may be applied to the exhaust variable valve operating apparatus 36.
- FIG. 13 is a diagram comparing the lift curve of the intake valve 30 and the intake air flow rate taken into the cylinder during the lift section when the eccentric angle ⁇ is 0 ° and when it is 180 °.
- FIG. 13A for the sake of comparison, it is assumed that the opening timings of the two lift curves are matched using the VVT mechanism 48.
- FIG. 13B shows the difference in the intake air flow rate due to the difference between the two lift curves under the same operating conditions (at the first high engine speed).
- the conventional variable valve operating apparatus that varies the operating angle of the valve on the premise that the driving camshaft is rotationally driven using the rotational force of the crankshaft is the intake variable valve operating apparatus 34 of the present embodiment.
- the valve operating angle is unilaterally increased along with the lift amount.
- the valve operating angle is unilaterally reduced with the lift amount. Therefore, in such a conventional variable valve operating apparatus, only one characteristic (shape) lift curve can be obtained for one working angle. Note that this is not limited to the variable valve operating apparatus in which the valve operating angle is continuously variable as described in the above-mentioned publication, and the same is true for the valve operating angle variable in stages.
- FIG. 14 is a diagram for explaining the behavior of intake air in the intake stroke and the compression stroke.
- it is effective to improve the torque by increasing the intake air amount.
- air flows into the cylinder during the lift section of the intake valve 30 as shown in FIG. 14A there is a timing at which more air easily enters due to the influence of the pulsation of the intake air and the position of the piston 12.
- Such timing changes depending on the engine speed. More specifically, as the engine speed increases, the timing becomes relatively late. Further, as the engine speed increases, the inertial force of the air sucked into the cylinder increases, and therefore, even after the intake bottom dead center (BDC) has passed, as shown in FIG. Air flows in.
- BDC intake bottom dead center
- the operating angle of the intake valve is set in one direction (in either the increasing direction or the decreasing direction) along with the lift amount.
- the closing timing of the intake valve is retarded. Therefore, as a result, the amount of air charged in the cylinder cannot be secured satisfactorily due to the effect of blowback.
- the closing timing of the intake valve is set at a timing at which no blowback occurs, a sufficient lift amount cannot be secured at a timing at which a large amount of air easily enters.
- the lift at the first high engine speed used on the higher speed side than the lift curve ( ⁇ 180 °) at the low engine speed.
- a high lift amount can be secured at a timing at which a large amount of air enters regardless of the engine speed.
- the amount of air filled in the cylinder can be increased.
- the lift peak timing is shifted between the two lift curves as described above, the amount of in-cylinder charged air decreases due to the effect of intake air blowback as in the case of the conventional variable valve gear. Can be prevented.
- the intake air blow-back can be further reduced as shown in the enlarged view in FIG.
- the eccentric angle ⁇ between 180 ° and 0 ° according to the level of the engine speed the output performance is improved by improving the torque of the internal combustion engine 10 as the intake air flow rate increases. Can be improved.
- FIG. 15 is a diagram comparing two lift curves having an eccentric angle ⁇ of 180 ° and 210 ° in relation to the valve stamp region.
- valve stamp In order to increase the valve overlap amount in which the valve opening period of the exhaust valve 32 and the valve opening section of the intake valve 30 overlap, it is effective to advance the opening timing of the intake valve 30 from the intake and exhaust top dead center. is there. However, if the advance amount of the opening timing of the intake valve 30 becomes too large, there is a concern about interference between the piston 12 and the intake valve 30 (so-called valve stamp). A hatched area in FIG. 15 indicates a “valve stamp area” of the lift amount of the intake valve 30 where the valve stamp is generated.
- the lift curve when the eccentric angle ⁇ is 210 ° is as described above with respect to the lift curve when the eccentric angle ⁇ is 180 ° (the lift curve in which the lift peak timing is substantially at the center of the valve opening period). Furthermore, the lift amount in a predetermined section near the opening timing of the intake valve 30 is low. Therefore, as compared with the lift curve when the eccentric angle ⁇ is 180 °, as shown in FIG. 15, it is possible to ensure a long valve opening period from the opening timing until the valve stamp area is reached.
- the opening timing of the intake valve 30 (more specifically, the entire lift curve) is made using the VVT mechanism 48, compared to when 180 ° is selected. It is possible to advance more greatly.
- the valve overlap amount can be effectively increased during acceleration.
- the scavenging effect is improved by increasing the valve overlap amount.
- the boost pressure can be effectively increased, so that the output performance of the internal combustion engine 10 can be improved.
- the intake pressure is lower than the exhaust pressure during acceleration, the internal EGR gas amount increases due to the expansion of the valve overlap amount. As a result, the fuel efficiency performance and exhaust emission performance of the internal combustion engine 10 can be improved.
- the rotational speed of the driven cam lobe 50a near the closing time (ramp part) can be reduced.
- the lift acceleration near the closing timing of the actual intake valve 30 acceleration of the intake valve 30 when seated
- valve bounce can be avoided even when the situation exceeds the second predetermined rotational speed NE2 for some reason, including the above irregular case. Therefore, it is possible to improve the reliability of the intake variable valve operating device 34 (the same applies when applied to the exhaust variable valve operating device 36).
- the predetermined section (ramp part) near the opening timing is also included in the deceleration section, it is possible to effectively prevent the occurrence of a valve jump or the like on the opening side. it can.
- the degree of influence on the valve bounce the section near the closing timing is larger than the section near the opening timing, so priority is given to effectively decelerating the predetermined section near the closing timing. The degree is high.
- the eccentric angle ⁇ is 320 °
- the base lift section after the intake valve 30 is closed is an acceleration section as shown in FIG. Since no load is applied from the cam lobe 50a side, the above-described problems do not occur.
- the lift angle timing is the same, but the lift peak timing is different.
- Two lift curves of the intake valve 30 are obtained.
- the first and second lift curves that have the same or substantially the same working angle value and that have different lift timings are different from each other in the eccentric angle ⁇ (0 ° and 180 °). ).
- OAx there are two values of eccentric angles ⁇ x1 and ⁇ x2 that realize the working angle value OAx. And even if the eccentric angles ⁇ x1 and ⁇ x2 when realizing the same operating angle value OAx, if the value of the eccentric angle ⁇ is different, at what timing the acceleration / deceleration section arrives during the lift section And the acceleration / deceleration amounts are also different, so that the lift peak timing is different. Therefore, depending on the characteristic (shape) of the lift curve required for the variable valve operating apparatus according to the operating conditions, the eccentricity when realizing any same working angle value OAx other than the combination of 0 ° and 180 °.
- the angles ⁇ x1 and ⁇ x2 may be used.
- the working angle values used in this case are not limited to exactly the same values, and may be regarded as substantially the same.
- the actuator 76 is used to obtain two lift curves of the intake valve 30 having the same operating angle but different lift peak timings.
- a raceway surface 70a whose center is eccentric with respect to the rotation center of the rotationally driven control sleeve 70 is provided, and the raceway surface 70a guides the rolling of the control roller 64 of the pantograph-like link mechanism 68.
- the actuator that moves the raceway surface in the plane direction orthogonal to the axis of the drive cam shaft is used. The configuration is not limited to the above.
- the actuator includes, for example, a control position of the raceway surface (for example, a control position of the raceway surface 70a shown in FIG. 7A) for obtaining a first lift curve, and a second lift curve.
- the guide member provided with the track surface is configured to be able to reciprocate between the control position of the track surface (for example, the control position of the track surface 70a shown in FIG. 7C). It may be.
- control using a plurality of lift curves having different lift peak timings according to the operating conditions of the internal combustion engine 10 using the intake variable valve operating device 34 I explained about.
- the control according to the present invention is not limited to the target for the intake valve 30, but for the exhaust valve, depending on the operating conditions of the internal combustion engine, a plurality of lift curves having different lift peak timings are selectively used. There may be.
- the control for changing the eccentric angle ⁇ which is the control amount of the actuator 76, according to the operating condition of the internal combustion engine 10 using the engine speed as the main control parameter has been described.
- the parameter for specifying the operating condition of the internal combustion engine for controlling the control amount of the actuator in the present invention is not limited to the engine speed, and may be another control parameter (for example, engine load).
- the eccentric angle ⁇ is 180 ° and 0 ° under two operating conditions with different engine speeds (at the low engine speed and the first high engine speed).
- the present invention is limited to the above as long as the first rotation angle and the second rotation angle are properly used under at least two operating conditions with different engine rotation speeds. is not. That is, the operating condition in which the first rotation angle or the second rotation angle is used may be a plurality of operating conditions.
- the track surface 70a formed as a circumferential surface is provided.
- the raceway surface in the present invention is not necessarily a circumferential surface, and may be formed in an elliptical shape, for example.
- control sleeve 70 and the control sleeve 70 are positioned so that the rotation center of the drive cam shaft 44 is positioned on the locus of the center point of the track surface 70a when viewed from the axial direction of the drive cam shaft 44.
- the description has been given by taking as an example a configuration in which the relative positional relationship with the drive cam shaft 44 is set.
- the variable valve operating apparatus of the present invention is not necessarily limited to the one having the above settings.
- the rotation center of the drive cam shaft 44 may be set so as to deviate from the locus of the center point of the track surface 70a when viewed from the axial direction of the drive cam shaft 44.
- control sleeve 70 having the raceway surface 70a for each cylinder is provided as a guide member, and the control sleeve 70 of each cylinder is simultaneously driven to rotate by the motor 80 via the single control shaft 78.
- the present invention is not limited to such a configuration.
- the control sleeve 70 provided as a guide member for each cylinder is rotationally driven for each cylinder by an individually provided electric motor. Also good.
- variable valve operating apparatus is not limited to the one having the above-described configuration.
- the variable cam device is configured such that the driven cam lobe directly drives the valve via the valve lifter. It may be.
- each driven cam lobe may be individually supported rotatably on the drive cam shaft.
- each driven cam lobe may include a link mechanism such as the link mechanism 68, a guide member having a raceway surface such as the raceway surface 70a, and an actuator such as the actuator 76.
- the drive arm portion 52a and the driven arm portion 50b having the common rotation center at the shaft center of the drive cam shaft 44, and the drive link 56 and the driven link 60 form a pantograph shape (diamond A link mechanism 68 that is a four-bar link (in other words, used on the angle side where the rotation angle ⁇ is less than 180 °).
- the link mechanism in the present invention is not necessarily limited to the one having such a configuration.
- the link mechanism is a four-bar link used on the angle side where the rotation angle ⁇ is larger than 180 °. May be.
- control sleeve 70 is the “guide member” in the present invention
- control roller side rotating shaft 62 and the control roller 64 are the “contact member” in the present invention
- the link plate 66 and the holding roller. 72 corresponds to “contact maintaining means” in the present invention.
- control means” in the present invention is realized by the ECU 40 executing a series of processes of the routine shown in FIG.
- the eccentric angles ⁇ of 180 ° and 0 ° correspond to the “first rotation angle” and the “second rotation angle” in the present invention, respectively.
- the lift curve when the eccentric angle ⁇ is 180 ° (at the time of the low engine speed) and the lift curve when the eccentric angle ⁇ is 0 ° (at the time of the first high engine speed) are in the present invention. It corresponds to a “first lift curve” and a “second lift curve”, respectively.
Abstract
Description
尚、出願人は、本発明に関連するものとして、上記の文献を含めて、以下に記載する文献を認識している。
駆動カム軸は、クランク軸の回転力によって回転駆動される。従動カムロブは、前記駆動カム軸と同心であって、当該駆動カム軸に回転自在に支持されている。ガイド部材は、前記駆動カム軸を覆うように形成された軌道面を有する。リンク機構は、前記駆動カム軸および前記従動カムロブのそれぞれに連結され、前記軌道面と接触する接触部材を有し、前記駆動カム軸の回転中心に対する前記接触部材の位置変化に伴って前記駆動カム軸に対する前記従動カムロブの回転角度を変化させる。接触維持手段は、前記駆動カム軸が一回転する間、当該駆動カム軸の周りを回る前記接触部材と前記軌道面との接触が維持されるようにする。アクチュエータは、前記軌道面を、前記駆動カム軸の軸線と直交する平面方向に移動させる。制御手段は、内燃機関の運転条件に応じて、前記平面方向における前記軌道面の移動量を変化させるべく前記アクチュエータの制御量を制御する。
このような構成によれば、ガイド部材を回転駆動することによってガイド部材の回転中心に対して偏心した中心を有する軌道面を上記平面方向に移動させる構成を有するアクチュエータを用いて、当該開度部材の回転角度を制御することによって駆動カム軸が一回転する間の従動カムロブの回転速度を変更可能とする可変動弁装置を実現することができる。そして、上記のような構成によれば、アクチュエータの制御量であるガイド部材の回転角度を変化させていった際に、同一もしくは実質的に同一の作用角値が得られ、かつ、リフト量がピークを示すタイミングの異なる第1および第2リフトカーブが得られるようになる。
これにより、1つの作用角に対して1つの特性(形状)のリフトカーブしか得ることのできない従来の可変動弁装置と比べ、同一もしくは実質的に同一の作用角値が得られるものであってリフト量がピークを示すタイミングの異なる第1および第2リフトカーブを運転条件に応じて使い分けることによって、各運転条件における要求をより満足させられるバルブの開弁特性の制御が可能となる。
リフト区間中に空気量が筒内に入り易いタイミングは、エンジン回転数に応じて変化する。より具体的には、エンジン回転数が高くなるほど、上記タイミングは、相対的に遅くなる。上記のような構成によれば、エンジン回転数の高低にかかわらず、リフト区間中において空気が多く入り易いタイミングにおいて吸気弁のリフト量を高く確保できるようになるので、筒内充填空気量を高めることができるようになる。このため、内燃機関の出力性能を向上させることができる。
これにより、第2リフトカーブの使用時に、吸気の吹き戻しの影響で筒内充填空気量が減少するのを防止することができる。
このような構成によれば、低エンジン回転数時に加速要求が出された場合に、吸気弁の開き時期付近の所定区間において、ピストンと吸気弁とのクリアランスをより十分に確保できるようになる。その結果、吸気弁の開き時期をより大きく進角させて、排気弁とのバルブオーバーラップ量を効果的に拡大させられるようになる。これにより、加速時に吸気圧力が排気圧力よりも高くなった状態では、バルブオーバーラップ量の拡大によって掃気効果が向上する。その結果、内燃機関の出力性能を向上させることができる。また、加速時に吸気圧力が排気圧力よりも低い状況下であれば、バルブオーバーラップ量の拡大によって、内部EGRガス量が増加する。その結果、内燃機関の燃費性能および排気エミッション性能を向上させることができる。
これにより、何らかの事情によりエンジン回転数が通常の使用範囲を超える状況となった場合であっても、バルブの着座時の加速度を低下させることで、バルブバウンス等のバルブ運動の異常が発生するのを回避することができる。このため、可変動弁装置の信頼性を向上させることが可能となる。
[内燃機関のシステム構成]
図1は、本発明の可変動弁装置34、36が搭載された内燃機関10のシステム構成を説明するための図である。尚、ここでは、内燃機関10は、一例として、4つの気筒(#1~#4)を有する直列4気筒型エンジンであるものとする。
図2は、図1に示す吸気可変動弁装置34の全体構成を概略的に示す斜視図である。図3は、図1に示す吸気可変動弁装置34が備える駆動カム軸44周りの構成を説明するための図である。
図4は、図1に示す吸気可変動弁装置34を、図2に示すA-A線で切断した断面図である。図5は、図2における矢視B方向から駆動カム軸44周りの構成を見た斜視図である。尚、図5においては、コントロールスリーブ70の図示を省略している。
上記回転角度θは、ここでは、図4に示すように、駆動カム軸44の軸方向から見て、駆動カム軸44の中心点とカム軸側回転軸54の中心点とを結ぶ直線(駆動軸)と、駆動カム軸44の中心点とカムロブ側回転軸58の中心点とを結ぶ直線(従動軸)とのなす角度として定義されている。
以下、本明細書中においては、駆動カム軸44の回転中心と軌道面70aの中心との偏心量および偏心方向を特定するための指標として、「偏心角度φ」を用いることとする。ここでは、図4に示すように、偏心角度φは、駆動カム軸44の軸方向から見て、コントロールスリーブ70の回転中心から駆動カム軸44の回転中心に向かう直線と、コントロールスリーブ70の回転中心から軌道面70aの中心点に向かう直線とのなす角度として定義されている。より具体的には、軌道面70aの中心点と駆動カム軸44の中心点とが一致している状態では、偏心角度φは0°となる。そして、偏心角度φは、図4中の反時計回りにおけるコントロールスリーブ70の回転量が大きくなることによって軌道面70aの中心点がその軌跡上を反時計回りに大きく回転するほど、大きな値となるように定義されている。また、図4に示す状態(すなわち、軌道面70aの中心点がコントロールスリーブ70の回転中心を通る鉛直線を基準として駆動カム軸44の回転中心と線対称な位置にある状態)では、偏心角度φは180°となる。駆動カム軸44の回転中心と軌道面70aの中心点との偏心量は、偏心角度φが180°である時に最大となる。
図6は、一例として、駆動カム軸44が一回転する間のリンク機構68の動作(主に、駆動カム軸44の一回転中の回転角度θの変化)を表した図である。より具体的には、図6は、軌道面70aが上記図4と同じ偏心状態(偏心角度φが180°である状態)にある時のリンク機構68の動作を表した図である。
図6に示す偏心状態は、アクチュエータ76によって偏心角度φが180°となるようにコントロールスリーブ70の回転量が調整されたことによって、軌道面70aの中心点がコントロールスリーブ70の回転中心を通る鉛直線を基準として駆動カム軸44の回転中心と線対称な位置にある状態である。この状態では、制御ローラー64が軌道面70aのほぼ右半分側に位置している時に、駆動カム軸44の回転中心と制御ローラー64の回転中心との距離が、偏心角度φが0°である時(すなわち、回転角度θが常にθ0となる時)よりも狭められることになる。以下の明細書中においては、接点Pが等回転角度点P0にある時よりも上記距離が狭められている軌道面70aの区間(図6の場合にはほぼ右半分側の区間)のことを、単に「狭小区間」と称することとする。
図6に示す偏心状態では、制御ローラー64の接点Pが軌道面70aのほぼ右半分側の狭小区間中の点P1に位置している時に、駆動カム軸44の回転中心と制御ローラー64の回転中心との距離が最も小さくなり、駆動軸と従動軸との間の回転角度θが最も拡大する。一方、この偏心状態では、制御ローラー64の接点Pが軌道面70aのほぼ左半分側の広大区間中の点P2に位置している時に、駆動カム軸44の回転中心と制御ローラー64の回転中心との距離が最も大きくなり、駆動軸と従動軸との間の回転角度θが最も縮小する。つまり、制御ローラー64の接点Pが点P2から点P1に向かって移動する間は、単位カム角当たりの回転角度θの変化量が増加するため、従動カムロブ50aの回転速度が駆動カム軸44の回転速度よりも高くなり(増速し)、一方、制御ローラー64の接点Pが点P1から点P2に向かって移動する間は、単位カム角当たりの回転角度θの変化量が減少するため、従動カムロブ50aの回転速度が駆動カム軸44の回転速度よりも低くなる(減速する)。このため、以下の明細書中においては、軌道面70a上における点P2から点P1までの区間を、単に「増速区間」と称し、軌道面70a上における点P1から点P2までの区間を、単に「減速区間」と称することとする。
すなわち、駆動カム軸44の周りを回っているリンク機構68には、従動カムロブ50aを介して、バルブスプリング86からのバネ反力が作用する。このバネ反力は、制御ローラー64および軌道面70aを介して、コントロールスリーブ70の径方向に作用する。更には、軌道面70aには、駆動カム軸44の回転に伴うリンク機構68からの慣性力が制御ローラー64を介して、コントロールスリーブ70の径方向に作用する。上述した本実施形態の吸気可変動弁装置34では、吸気弁30の作用角を変化させるべくコントロールスリーブ70を動作させる方向は、上記バネ反力等の作用方向(径方向)とは異なり、当該コントロールスリーブ70の回転方向(周方向)である。従って、仮に上記バネ反力等の周方向の分力に抗する方向にコントロールスリーブ70を回転駆動する場合であっても、作用角可変のためにコントロールスリーブ70を回転駆動するうえでのアクチュエータ76の負荷トルクは、周方向の分力に基づく小さなトルクとなる。このため、本吸気可変動弁装置34によれば、アクチュエータ76に作用する負荷トルクを大幅に低減することが可能である。
また、本実施形態の吸気可変動弁装置34によれば、軌道面70aと接触する接触部材として、制御ローラー64を採用し、軌道面70a上を転動させるようにしている。このため、上記接触部材として、軌道面70aとの接触を摺動を利用して行う部材を採用する場合と比べ、接触部のフリクションや摩耗を低減することができる。
更に、本実施形態の吸気可変動弁装置34では、駆動アーム部52aおよび駆動リンク56に対して、駆動カム軸44の回転方向の後方側ではなく前方側に、制御ローラー64を間に介在させた状態で従動リンク60を配置している。このような構成によれば、バルブスプリング86の上記バネ反力に起因して駆動リンク56および従動リンク60に作用する力は、引張力や曲げ力ではなく圧縮力となる。このため、駆動リンク56および従動リンク60の変形や応力の低減を図ることができ、制御ローラー64の位置(駆動カム軸44と従動カムロブ50aとの回転角度θ)がより確実に定まるようになる。
次に、図10を参照して、吸気可変動弁装置34により実現される吸気弁30の開弁特性(リフトカーブの形状)に主たる影響を与える事前の設定要素について説明する。
次に、図11乃至図16を参照して、以上説明した構成を有する吸気可変動弁装置34を用いた内燃機関10の特徴的な制御について説明する。
図11は、本発明の実施の形態1において内燃機関10の運転条件に応じて変更される吸気弁30の各リフトカーブと偏心角度φとの関係を表した図である。
図13は、偏心角度φが0°である場合と180°である場合とで、吸気弁30のリフトカーブ、および、リフト区間中に筒内に取り込まれる吸入空気流量を比較した図である。尚、図13(A)では、対比のため、VVT機構48を利用して2つのリフトカーブの開き時期が合わせられているものとする。また、図13(B)は、同一の運転条件(第1高エンジン回転数時)において上記2つのリフトカーブの違いによる吸入空気流量の差を表したものである。
内燃機関10の出力を向上させるための方策としては、吸入空気量の増加によってトルク向上を図ることが有効である。吸気弁30のリフト区間中に図14(A)に示すように空気が筒内に流入する際、吸入空気の脈動とピストン12の位置の影響によって、空気が多く入り易いタイミングが存在する。このようなタイミングは、エンジン回転数に応じて変化する。より具体的には、エンジン回転数が高くなるほど、上記タイミングは、相対的に遅くなる。また、エンジン回転数が高くなると、筒内に吸入される空気の慣性力が大きくなるので、図13(B)に示すように、吸気下死点(BDC)を過ぎた後においても筒内に空気が流入する。ただし、圧縮行程に入った後に長く吸気弁30を開いた状態にしていると、吸気通路16側への吹き戻しにより筒内に充填される空気量が減少することになる。従って、吸気弁30の閉じ時期は、図14(B)に示すように、空気の慣性力の影響と吹き戻しの防止とを考慮して決定することが必要となる。
以上のように、エンジン回転数の高低に応じて、偏心角度φを180°と0°の間で変更することにより、吸入空気流量の増加に伴う内燃機関10のトルク向上によって出力性能を良好に向上させることができる。
図15は、バルブスタンプ領域との関係で、偏心角度φが180°と210°の2つのリフトカーブを比較した図である。
図16は、偏心角度φが320°のリフトカーブを等速時のリフトカーブ(φ=0°)と比較した図である。
また、上述した実施の形態1においては、偏心角度φの180°および0°が本発明における「第1回転角度」および「第2回転角度」にそれぞれ相当している。また、偏心角度φが180°である時(上記低エンジン回転数時)のリフトカーブ、および偏心角度φが0°である時(上記第1高エンジン回転数時)のリフトカーブが本発明における「第1リフトカーブ」および「第2リフトカーブ」にそれぞれ相当している。
12 ピストン
14 燃焼室
16 吸気通路
18 排気通路
20 エアフローメータ
22 ターボ過給機
24 スロットルバルブ
26 燃料噴射弁
28 点火プラグ
30 吸気弁
32 排気弁
34 吸気可変動弁装置
36 排気可変動弁装置
38 クランク角センサ
40 ECU(Electronic Control Unit)
42 アクセル開度センサ
44 駆動カム軸
46 タイミングプーリー
48 可変バルブタイミング(VVT)機構
50 カムピース
50a 従動カムロブ
50a1 従動カムロブのベース円部
50a2 従動カムロブのノーズ部
50b 従動カムロブの従動アーム部
52 駆動アーム
52a 駆動アームの駆動アーム部
54 カム軸側回転軸
56 駆動リンク
58 カムロブ側回転軸
60 従動リンク
62 制御ローラー側回転軸
64 制御ローラー
66 リンクプレート
68 リンク機構
70 コントロールスリーブ(ガイド部材)
70a コントロールスリーブの軌道面
70bコントロールスリーブのギヤ
72 保持ローラー
74 保持用回転軸
76 アクチュエータ
78 制御軸
78a、78b 制御軸のギヤ
80 電動モータ
80a 電動モータの出力軸
80b 電動モータ側のギヤ
82 ロッカーアーム
82a ロッカーローラー
84 油圧式ラッシュアジャスタ
86 バルブスプリング
Claims (7)
- クランク軸の回転力によって回転駆動される駆動カム軸と、
前記駆動カム軸と同心であって、当該駆動カム軸に回転自在に支持された従動カムロブと、
前記駆動カム軸を覆うように形成された軌道面を有するガイド部材と、
前記駆動カム軸および前記従動カムロブのそれぞれに連結され、前記軌道面と接触する接触部材を有し、前記駆動カム軸の回転中心に対する前記接触部材の位置変化に伴って前記駆動カム軸に対する前記従動カムロブの回転角度を変化させるリンク機構と、
前記駆動カム軸が一回転する間、当該駆動カム軸の周りを回る前記接触部材と前記軌道面との接触が維持されるようにする接触維持手段と、
前記軌道面を、前記駆動カム軸の軸線と直交する平面方向に移動させるアクチュエータと、
内燃機関の運転条件に応じて、前記平面方向における前記軌道面の移動量を変化させるべく前記アクチュエータの制御量を制御する制御手段と、
を備えることを特徴とする内燃機関の可変動弁装置。 - 前記アクチュエータは、前記ガイド部材を回転駆動するものであり、
前記軌道面は、円周面であって、前記ガイド部材の回転中心に対して前記軌道面の中心が偏心した状態で前記ガイド部材に備えられており、
前記制御手段による前記アクチュエータの制御量は、前記ガイド部材の回転角度であることを特徴とする請求項1記載の内燃機関の可変動弁装置。 - 前記制御手段は、前記ガイド部材の回転角度の目標値として、少なくとも第1回転角度と第2回転角度とを含み、
前記第1回転角度は、前記従動カムロブにより駆動されるバルブの作用角を所定の作用角値が得られるようにした際の前記ガイド部材の回転角度であって、
前記第2回転角度は、前記第1回転角度への制御時に得られる前記作用角値と同じもしくは実質的に同じ作用角値が得られ、かつ、前記第1回転角度への制御時に得られる前記バルブの第1リフトカーブと比べてリフト量がピークを示すタイミングの異なる第2リフトカーブが得られるようにした際の前記ガイド部材の回転角度であって、
前記制御手段は、エンジン回転数が異なる少なくとも2通りの運転条件下において、前記第1回転角度と前記第2回転角度とを使い分けることを特徴とする請求項2記載の内燃機関の可変動弁装置。 - 前記バルブは、吸気弁であって、
前記第2リフトカーブは、前記第1リフトカーブと比較して、リフト量がピークを示すタイミングが遅角するように設定されたものであって、
前記制御手段は、前記第1回転角度を使用する運転条件よりも高エンジン回転数となる運転条件において、前記第2回転角度を使用することを特徴とする請求項3記載の内燃機関の可変動弁装置。 - 前記第2リフトカーブは、前記第1リフトカーブと比較して、前記バルブの閉じ時期付近の所定区間におけるリフト量が低くなるように設定されたものであることを特徴とする請求項4記載の内燃機関の可変動弁装置。
- 前記従動カムロブにより駆動されるバルブは、吸気弁であって、
前記制御手段は、低エンジン回転数時に加速要求が出された場合に、前記吸気弁の開き時期付近の所定区間において前記駆動カム軸に対する前記従動カムロブの相対的な回転速度が増加するように、前記アクチュエータの制御量を制御することを特徴とする請求項1乃至5の何れか1項記載の内燃機関の可変動弁装置。 - 前記制御手段は、エンジン回転数が所定回転数よりも高い場合に、前記従動カムロブにより駆動されるバルブの閉じ時期付近の所定区間において前記駆動カム軸に対する前記従動カムロブの相対的な回転速度が減少するように、前記アクチュエータの制御量を制御することを特徴とする請求項1乃至6の何れか1項記載の内燃機関の可変動弁装置。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201180053918.7A CN103201466B (zh) | 2010-11-08 | 2011-08-29 | 内燃机的可变气门装置 |
US13/824,496 US9046012B2 (en) | 2010-11-08 | 2011-08-29 | Variable valve operating apparatus for internal combustion engine |
JP2012542834A JP5582196B2 (ja) | 2010-11-08 | 2011-08-29 | 内燃機関の可変動弁装置 |
EP11839923.7A EP2639415B1 (en) | 2010-11-08 | 2011-08-29 | Variable valve device for internal combustion engine |
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JP2010-250033 | 2010-11-08 | ||
JP2010250033 | 2010-11-08 |
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WO2012063537A1 true WO2012063537A1 (ja) | 2012-05-18 |
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PCT/JP2011/069470 WO2012063537A1 (ja) | 2010-11-08 | 2011-08-29 | 内燃機関の可変動弁装置 |
PCT/JP2011/069469 WO2012063536A1 (ja) | 2010-11-08 | 2011-08-29 | 可変動弁装置 |
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PCT/JP2011/069469 WO2012063536A1 (ja) | 2010-11-08 | 2011-08-29 | 可変動弁装置 |
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US (2) | US9046012B2 (ja) |
EP (2) | EP2639416B1 (ja) |
JP (2) | JP5582196B2 (ja) |
CN (2) | CN103201465B (ja) |
WO (2) | WO2012063537A1 (ja) |
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Also Published As
Publication number | Publication date |
---|---|
EP2639415B1 (en) | 2015-09-30 |
US20130213332A1 (en) | 2013-08-22 |
EP2639416B1 (en) | 2016-11-09 |
WO2012063536A1 (ja) | 2012-05-18 |
CN103201465B (zh) | 2015-07-01 |
JP5582195B2 (ja) | 2014-09-03 |
CN103201466B (zh) | 2015-05-27 |
JPWO2012063536A1 (ja) | 2014-05-12 |
US8955478B2 (en) | 2015-02-17 |
CN103201466A (zh) | 2013-07-10 |
EP2639416A4 (en) | 2015-05-06 |
CN103201465A (zh) | 2013-07-10 |
EP2639416A1 (en) | 2013-09-18 |
EP2639415A4 (en) | 2014-04-16 |
US20130276731A1 (en) | 2013-10-24 |
EP2639415A1 (en) | 2013-09-18 |
JPWO2012063537A1 (ja) | 2014-05-12 |
US9046012B2 (en) | 2015-06-02 |
JP5582196B2 (ja) | 2014-09-03 |
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