CN102278160A - Valve timing controller - Google Patents

Valve timing controller Download PDF

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Publication number
CN102278160A
CN102278160A CN2011101651237A CN201110165123A CN102278160A CN 102278160 A CN102278160 A CN 102278160A CN 2011101651237 A CN2011101651237 A CN 2011101651237A CN 201110165123 A CN201110165123 A CN 201110165123A CN 102278160 A CN102278160 A CN 102278160A
Authority
CN
China
Prior art keywords
viscosity fluid
magnetic
control device
valve timing
coil
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN2011101651237A
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Chinese (zh)
Inventor
冈邦晃
大江修平
杉野正芳
奈良健一
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Denso Corp
Original Assignee
Denso Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Denso Corp filed Critical Denso Corp
Publication of CN102278160A publication Critical patent/CN102278160A/en
Pending legal-status Critical Current

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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
    • F01L1/352—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 using bevel or epicyclic 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
    • 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
    • F01L1/3442—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 using hydraulic chambers with variable volume to transmit the rotating force
    • F01L2001/3445—Details relating to the hydraulic means for changing the angular relationship
    • F01L2001/34483—Phaser return springs
    • 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
    • F01L2201/00—Electronic control systems; Apparatus or methods therefor
    • 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
    • F01L2250/00—Camshaft drives characterised by their transmission means
    • F01L2250/02—Camshaft drives characterised by their transmission means the camshaft being driven by chains
    • 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
    • F01L2301/00—Using particular materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2800/00—Methods of operation using a variable valve timing mechanism
    • F01L2800/01—Starting
    • 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
    • F01L2820/00—Details on specific features characterising valve gear arrangements
    • F01L2820/03—Auxiliary actuators
    • F01L2820/032—Electric motors

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

The invention relates to a valve timing controller (1) which has a case (110) which defines a fluid chamber (114) therein. A magnetic viscosity fluid (140) is enclosed in the fluid chamber (114). The magnetic viscosity fluid (140) including magnetic particles and its viscosity varies according to a magnetic field applied thereto. A coil (150) and a control circuit (200) applies magnetic field to the magnetic viscosity fluid (140) to variably control a viscosity thereof. A brake rotor (130) is rotatably accommodated in the fluid chamber (114) and receives a brake torque from the magnetic viscosity fluid according to the viscosity thereof. A phase adjusting mechanism (300) is connected to the brake rotor (130) for adjusting a relative rotational phase between the crankshaft (2) and the camshaft according to the brake torque. When it is estimated that the engine will be started, the coil (150) is energized to generated heat in the magnetic viscosity fluid (140).

Description

Valve timing controller
Technical field
The present invention relates to (valve timing) controller valve timing, this valve timing controller is regulated the valve timing by the valve of camshaft (camshaft) opening/closing, drives this camshaft by bent axle (crankshaft) the transmission torque from internal-combustion engine.
Background technique
Traditionally, known valve timing controller is according to the relative rotatable phase of being regulated by the retarding torque (braking torque) of actuator (actuator) generation between bent axle and the camshaft.Depend on above-mentioned relative rotatable phase the valve timing of intake valve and/or exhaust valve, be called the motor phase place at this.JP-2008-51093A shows by the retarding torque that generates fluid actuator and regulates such valve timing controller of motor phase place.
Specifically, this valve timing controller has wherein with the actuator of magnetic viscosity fluid-tight in housing.This magnetic viscosity fluid contacts with brake rotors.Apply magnetic field to this magnetic viscosity fluid, thereby control the viscosity of magnetic viscosity fluid changeably.According to the viscosity of magnetic viscosity fluid, on brake rotors, generate retarding torque by described housings support.Thereby, regulate the motor phase place according to retarding torque.
Usually, when the temperature of magnetic viscosity fluid sharply descended, the magnetic viscosity fluid became its viscosity with respect to the unsettled glass transition state in magnetic field (solid-state).Thereby, if enter the glass transition state, then may not can when resetting motor generate necessary retarding torque at motor stopping period magnetic viscosity fluid.Under these circumstances, can't obtain optimum motor phase place and the startability of motor is worsened.Not too can guarantee the precision of valve timing controller.
Summary of the invention
Propose the present invention in view of the above problems, and the object of the present invention is to provide a kind of valve timing controller of guaranteeing its reliability.
According to the present invention, a kind of valve timing controller is regulated the valve timing that is sent to the torque opening/closing valve of camshaft by the bent axle from internal-combustion engine.Valve timing controller comprises: the housing that limits fluid chamber therein; And be enclosed in magnetic viscosity fluid in the fluid chamber.Described magnetic viscosity fluid comprises that magnetic-particle and its viscosity change according to the magnetic field that is applied thereto.
Described valve timing controller also comprises: viscosity control device is used for controlling changeably by magnetic field is put on the magnetic viscosity fluid viscosity of described magnetic viscosity fluid; Brake rotor rotatably is contained in the fluid chamber and receives the break torque of depending on its viscosity from the magnetic viscosity fluid; Phase-regulating mechanism is connected to brake rotor and is used for according to break torque and regulates relative rotatable phase between bent axle and the camshaft; And heating control device, be used for when estimating that internal-combustion engine will start, generating heat at the magnetic viscosity fluid.
When estimated engine will start, make described coil electricity in the magnetic viscosity fluid, to generate heat.Even this magnetic viscosity fluid is in the glass transition state, also take this magnetic viscosity fluid out of described glass transition state, thereby viscosity change becomes stable according to the magnetic field that is applied.As a result, when engine start, can be by magnetic field being put on the viscosity that the magnetic viscosity fluid is controlled described magnetic viscosity fluid, thus the break torque of expectation is inputed to brake rotor so that phase-regulating mechanism makes motor phase place optimum.Therefore, can guarantee the high reliability of described valve timing controller.
Description of drawings
By the following description of carrying out with reference to accompanying drawing, other purpose of the present invention, feature and advantage will become more obvious, and identical reference character refers to identical parts in the accompanying drawing, in the accompanying drawings:
Fig. 1 illustrates the sectional view that extracts along the line I-I of Fig. 2 according to the valve timing controller of first embodiment of the invention;
Fig. 2 is the sectional view along the line II-II extraction of Fig. 1;
Fig. 3 is the sectional view along the line III-III extraction of Fig. 1;
Fig. 4 is the performance plot that is used to explain the magnetic viscosity fluid;
Fig. 5 is another performance plot that is used to explain the magnetic viscosity fluid;
Fig. 6 A and Fig. 6 B are the time diagrams that is used to explain according to first embodiment's energising control (energization control);
Fig. 7 is the performance plot that is used to explain according to the heating of first embodiment's magnetic viscosity fluid;
Fig. 8 is the flow chart that illustrates according to the control flow of first embodiment's circuit for controlling electricity turning;
Fig. 9 A and Fig. 9 B are the time diagrams that is used to explain according to second embodiment's energising control;
Figure 10 A and Figure 10 B are the time diagrams that is used to explain according to the 3rd embodiment's energising control;
Figure 11 is the flow chart that illustrates according to the control flow of the 4th embodiment's circuit for controlling electricity turning;
Figure 12 is the flow chart that illustrates according to the control flow of the 5th embodiment's circuit for controlling electricity turning;
Figure 13 is the sectional view that illustrates according to the 6th embodiment's valve timing controller;
Figure 14 is the flow chart that illustrates according to the control flow of the 6th embodiment's circuit for controlling electricity turning; And
Figure 15 is the flow chart that illustrates according to the control flow of the 7th embodiment's circuit for controlling electricity turning.
Embodiment
A plurality of embodiment of the present invention is described with reference to the accompanying drawings.In each embodiment, identical part is represented by identical reference character with assembly and is no longer repeated identical description.And, can suitably make up each embodiment.
[first embodiment]
Fig. 1 shows the valve timing controller 1 according to first embodiment of the invention.Valve timing controller 1 is installed on the vehicle, and more particularly, and valve timing controller 1 is installed in the engine torque from the bent axle (not shown) of internal-combustion engine is sent on the transmission system of camshaft 2.In current embodiment, camshaft 2 is by the intake valve (not shown) that opens and closes internal-combustion engine that sends of engine torque.Valve timing controller 1 is regulated the valve timing of intake valve.
To shown in Figure 3, valve timing controller 1 comprises actuator 100, current control circuit 200, phase-regulating mechanism 300 or the like as Fig. 1.Valve timing controller 1 is regulated the valve timing of relative rotatable phase to realize expecting between bent axle and the camshaft 2.
(actuator 100)
As shown in Figure 1, actuator 100 is the electrical fluid breaks that comprise housing 110, brake rotor 130 and coil 150.
Housing 110 comprises fixed component 111 and lid part 112.Fixed component 111 be annular and make by magnetic material.Fixed component is fixed on the drive chain case (not shown) of internal-combustion engine.Lid part 112 is also made by magnetic material.Lid part 112 and fixed component 111 limit fluid chamber 114 betwixt.
Brake rotor 130 is made by magnetic material and is comprised shaft portion 131 and rotor portion 132.Shaft portion 131 extends through fixed component 111 to be connected with phase-regulating mechanism 300.The other end of shaft portion 131 is rotatably supported by bearing 115 by lid part 112.The intermediate portion of shaft portion 131 is supported by bearing 116 by fixed component 111.From phase-regulating mechanism 300 reception engine torques the time, in Fig. 2 and Fig. 3, brake rotor 130 is rotated counterclockwise.
Rotor portion 132 be dish type and be contained in the fluid chamber 114.Between rotating part 132 and fixed component 111, limit the first magnetic gap 114a.Between rotor portion 132 and lid part 112, limit the second magnetic gap 114b.
Magnetic viscosity fluid 140 is enclosed in the fluid chamber 114.Magnetic viscosity fluid 140 is the functional fluids that comprise basic liquid (base-liquid) and magnetic-particle.Basis liquid is the non magnetic fluid such as oil.Preferably, basic liquid is the lubricant oil that is used for motor.Magnetic-particle is the Magnaglo of iron carbonyl.
As shown in Figure 4, magnetic viscosity fluid 140 has the characteristic of its viscosity according to the intensity increase in applying magnetic field.And then proportional with viscosity, its shear yield stress also increases.And then, do not applying under the situation in magnetic field to magnetic viscosity fluid 140, as shown in Figure 5, along with the temperature reduction of magnetic viscosity fluid 140, its substrate viscosity increases.When temperature was crossed reduction, magnetic viscosity fluid 140 became its viscosity with respect to the unsettled glass transition state in magnetic field (solid-state).In the present embodiment, the lower limit temperature " TI " with magnetic viscosity fluid 140 is set at " 20 ℃ ".
Coil 150 is wrapped in around the coaxial resin spool of fixed component 111.To coil 150 energisings the time, generate magnetic field so that magnetic flux passes through the first magnetic gap 114a, rotor portion 132, the second magnetic gap 114b, lid part 112 and fixed component 111.The magnetic field that is generated is applied to is positioned at magnetic gap 114a, the magnetic viscosity fluid 140 among the 114b is so that its viscosity-modifying.Thereby, between housing 110 and brake rotor 130, generate retarding torque with along the clockwise direction brake rotor 130 among Fig. 2 and Fig. 3.As mentioned above, when coil 150 energisings are applied to the magnetic field of magnetic viscosity fluid 140 with generation,, retarding torque is input to brake rotor 130 according to the viscosity of magnetic viscosity fluid 140.
As shown in Figure 1, resin spool 151 is exposed to the first magnetic gap 114a in the fluid chamber 114.Fixed component 111 also is exposed to the first magnetic gap 114a.Thereby, even coil 150 generates heat when energising, also this heat can be transferred to the magnetic viscosity fluid 140 that is arranged in the first magnetic gap 114a by resin spool 151 and fixed component 111.
(current control circuit 200)
Current control circuit 200 comprises microcomputer and is electrically connected to the storage battery 4 of coil 150 and vehicle.When motor stops, setting up the beginning condition " Cw " of appointment, the electric power that current control circuit 200 receives from storage battery 4, thus current control circuit 200 changes to the connection pattern so that coil 150 can be energized from " shut " mode".In the time of when the door lock of vehicle discharges, at car door opening or when receiver receives signal from the transmitter of keyless access system, set up this and begin condition " Cw ".Even if changing to the connection pattern from pattern through fixed time " ST " also unstart of motor afterwards, the pattern of then connecting is changed into " shut " mode" automatically.
During the connection pattern, current control circuit 200 controls are fed to the electric current " I " of coil 150, thereby regulate the magnetic field that is applied to magnetic viscosity fluid 140.As a result, according to the magnetic field that is applied, the viscosity of controlling magnetic viscosity fluid 140 changeably is so that the retarding torque increase/reduction of brake rotor 130.
In current embodiment, control electric current " I " as shown in Figure 6A, so that shown in Fig. 6 B, change before engine start and afterwards the magnetic flux density " B " that is applied to magnetic viscosity fluid 140.Specifically, during the period of motor unstart " α ", control electric current " I " is so that this electric current " I " changes as the pulse with low frequency " f α " and the effective electric power in set period " RT " is the high effectively electric power " W α " of roughly 5Ws.During the period of engine start " β ", control electric current " I " is so that this electric current " I " changes as the pulse with high frequency " f β " and the effective electric power in set period " RT " is low electric power " W β ".
According to above energising control, during the period " α ", the magnetic-particle in the magnetic viscosity fluid 140 repeats the motion that the chain bunch (chain-shaped cluster) of magnetic-particle synthesizes and decomposes according to the variation of the magnetic flux density " B " shown in Fig. 6 B.As a result, magnetic viscosity fluid 140 is owing to the above-mentioned motion of magnetic-particle generates heat.As shown in Figure 7, have at the electric current that is applied under the situation of the low frequency " f α " such as 2-10Hz, magnetic viscosity fluid 140 generates heat effectively.And then magnetic viscosity fluid 140 receives heat from coil 150, so that the temperature of this magnetic viscosity fluid 140 effectively increases.
During the period " β ", electric current " I " has roughly the high frequency of 50Hz " f β " to generate the roughly low electric power of 3Ws " W β ".And then shown in Fig. 6 B, magnetic flux density " B " changes according to frequency " f β ", and magnetic viscosity fluid 140 receives and stirs action (agitation action).Thereby the viscosity of fluid 140 changes and becomes stable with respect to the magnetic field that is applied, and can stably obtain the retarding torque expected.
Should be noted that the energising of current control circuit 200 other electronic units of control.
(phase-regulating mechanism 300)
To shown in Figure 3, phase-regulating mechanism 300 provides and drives rotor 10, is driven rotor 20, accessory 30, planetary carrier 40 and planetary pinion 50 as Fig. 1.
Drive rotor 10 and comprise geared parts 12 and sprocket tooth (sprocket) parts 13 that axially connect each other by bolt.Geared parts 12 comprises first internal gear 14 that is positioned on its inner radial peripheral wall.First internal gear 14 limits the top circle of the radially inner side that is positioned at root circle.As shown in Figure 1, sprocket tooth parts 13 have and are positioned at its outer a plurality of wheel teeth 16 of placing.The timing chain (not shown) is wrapped in around a plurality of wheel teeth of the wheel tooth 16 of sprocket tooth parts 13 and bent axle so that sprocket tooth parts 13 are linked to bent axle.By timing chain with engine torque when bent axle is sent to sprocket tooth parts 13, drive rotor 10 according to crankshaft rotating.The sense of rotation that drives rotor 10 is the counter clockwise direction among Fig. 2 and Fig. 3.
As shown in figures 1 and 3, being driven motor 20 is arranged in the sprocket tooth parts 13 coaxially.Be driven rotor 20 and have the attachment portion 21 that is positioned on its base wall part.Attachment portion 21 and camshaft 2 coaxial couplings.This coupling can make and be driven rotor 20 with camshaft 2 rotation synchronously and with respect to driving rotor 10 relative rotations.The sense of rotation that is driven rotor 20 is corresponding with the counter clockwise direction among Fig. 2 and Fig. 3.
As shown in Figure 1, be driven rotor 20 and comprise second internal gear 22 that is positioned on its inner radial peripheral wall.Second internal gear 22 limits the top circle that is radially positioned at the root circle inboard.The internal diameter of second internal gear 22 is greater than the internal diameter of first internal gear 14, and the number of teeth amount of second internal gear 22 is greater than the number of teeth amount of first internal gear 14.Second internal gear 22 on its axial direction away from first internal gear 14.
Accessory 30 is torsion coil spring (torsion coil spring) and the inboard that is axially disposed within sprocket tooth parts 13.One end 31 and 13 interlocks of sprocket tooth parts of accessory 30, and the other end 32 and attachment portion 21 interlocks.Accessory 30 generates assist torque between the rotor 20 and setovers along retarding direction with respect to driving rotor 10 so that be driven rotor 20 driving rotor 10 and be driven.
Cylindrical planetary gear carrier 40 has torque receiving part 41, and retarding torque is sent to this torque receiving part from brake rotor 130.Comprise a pair of groove 42 with joint (joint) 43 interlocks with the coaxial torque receiving part 41 of shaft portion 131.By this joint 43, torque receiving part 41 is connected to shaft portion 131.Planetary carrier 40 rotates together with brake rotor 130 and carries out with respect to the relative rotation that drives rotor 10.Should be noted that planetary carrier 40 and brake rotor 130 rotate along the counter clockwise direction among Fig. 2 and Fig. 3.
To shown in Figure 3, planetary carrier 40 has the supporting part 46 of support planetary gears 50 as Fig. 1.Supporting part 46 is set to shaft portion 131 off-centre and by the center hole 51 coaxial interlocks of planetary bearing 48 with planetary pinion 50.Planetary pinion 50 is supported to carry out planetary motion by supporting part 46.Planetary pinion 50 is around the eccentric shaft rotation of supporting part 46, and planetary pinion 50 is also with respect to planetary carrier 40 revolution.Thereby, carrying out on the revolution direction of planetary carrier 40 at planetary pinion 50 when driving the relative rotation of rotor 10, then planetary pinion 50 is carried out planetary motions.
Planetary pinion 50 has first outer gear 52 and second outer gear 54.First outer gear 52 and 14 interlocks of first internal gear.Second outer gear 54 and 22 interlocks of second internal gear.The external diameter of second outer gear 54 is greater than the external diameter of first outer gear 52.The wheel tooth quantity of second outer gear 54 and first outer gear 52 is than the little identical wheel tooth quantity of number of teeth amount of internal gear 22,14.
Above-mentioned phase-regulating mechanism 300 is regulated the motor phase place according to the assist torque of the retarding torque of brake rotor 130, accessory 30 and the balance that is transferred to from camshaft 2 between the variable torque of brake rotor 130.
Specifically, with when driving the identical speed rotation of rotor 10, planetary carrier 40 is not carried out with respect to the relative rotation that drives rotor 10 at brake rotor 130.Thereby planetary pinion 50 is not carried out planetary motion together with rotor 10,20 rotations, thereby keeps the motor phase place.
Simultaneously, when brake rotor 130 rotated to be lower than the speed opposing assist torque that drives rotor 10, planetary carrier 40 rotated along retarding direction with respect to driving rotor 10.As a result, planetary pinion 50 is carried out planetary motion and is driven rotor 20 and rotates relatively on respect to the direction in advance that drives rotor 10, so that the motor phase place in advance.
Simultaneously, with when driving the speed rotation of rotor 10, planetary carrier 40 is with respect to driving rotor 10 along direction rotation in advance at brake rotor 130.As a result, planetary pinion 50 is carried out planetary motion and is driven gear 20 with respect to driving rotor 10 along the retarding direction rotation, so that motor phase delay.
(control flow)
With reference to Fig. 8, the control flow that current control circuit 200 is carried out will be described below.
In step S100, computer determines whether to have set up pre-starting conditions " Cs " about the motor that is stopped.Any incident that pre-starting conditions " Cs " takes place before being included in and piloting engine.
Answer in step S100 is when being, process proceeds to step S101, and wherein computer is determined whether be in wherein in the inside of housing 110 temperature of magnetic viscosity fluid 140 is lower than in the cryogenic conditions " SI " of lower limit temperature " TI ".
Answer in step S101 is when being, process proceeds to step S102, and wherein coil 150 was switched in the period " α ".As a result, coil 150 receives the electric power with low frequency " f α ", generates high electric power " W α ".Effective heating of beginning magnetic viscosity fluid 140.
In step S103, computer determines whether to detect the engine start command " Os " such as connecting ignition switch.Answer in step S103 when being, process proceeds to step S104, the crank rotation (cranking) of wherein piloting engine and coil is gone.Thereby, up to piloting engine, effectively heated magnetic viscosity fluid 140.
In step S105, coil 150 beginnings energising in the period " β ".As a result, coil 150 receives the electric power of high frequency " f β ", generates low electric power " W β ".Magnetic viscosity fluid 140 be stirred and the condition of less heating under, generate retarding torque to regulate the motor phase place.
In step S106, computer determines whether to detect the perfect combustion condition " Ss " of motor.Answer in step S106 stops current control flow when being.Thereby when piloting engine, magnetic viscosity fluid 140 stably generates retarding torque, thereby realizes stable motor phase adjusted.
Answer in step S101 is not for the time, and process proceeds to step S107, and wherein computer determines whether to detect engine start command " Os ".Answer in step S107 is when being, process proceeds to step S105 and S106, and wherein coil 150 was switched in the period " β ".
According to the foregoing description,, when will starting, estimated engine guarantees to heat this magnetic viscosity fluid 140 even magnetic viscosity fluid 140 is under the cryogenic conditions " SI ".As a result, the viscosity of magnetic viscosity fluid 140 depends on the magnetic field that is applied.When engine start, the viscosity of magnetic viscosity fluid 140 seldom depends on its temperature, thereby the retarding torque of expectation stably can be input in the brake rotor 130.Therefore, optimized the motor phase place that is used to pilot engine, therefore can guarantee the high reliability of valve timing controller 1 owing to be connected to the phase-regulating mechanism 300 of brake rotor 130.
In above-mentioned first embodiment, coil 150 is corresponding with viscosity control device of the present invention with current control circuit 200.And coil 150 is corresponding with heating control device of the present invention with current circuit 200.
[second embodiment]
Shown in Fig. 9 A and 9B, second embodiment is first embodiment's a modification.In the energising control step during the period " α ", corresponding with the step S102 among Fig. 8, shown in Fig. 9 A, apply the have low frequency alternating current of " f α " to coil 150.Effective electric power in set period " RT " is high effectively electric power " W α ".As a result, shown in Fig. 9 B, will be applied to magnetic viscosity fluid 140 with the magnetic flux density " B " that low frequency " f α " changes.Magnetic viscosity fluid 140 is owing to the motion of magnetic-particle generates heat and receives heat from the coil 150 that generates heat according to high electric power " W α ".
During the period " β ", apply the have high frequency alternating current of " f β " to coil 150.Effective electric power in set period " RT " is low effective electric power " W β ".As a result, magnetic viscosity fluid less generation heat during the period " β ".
Thereby, same in a second embodiment, even magnetic viscosity fluid 140 is under the cryogenic conditions " SI ", when will starting, estimated engine guarantees to heat magnetic viscosity fluid 140.When engine start, the viscosity of magnetic viscosity fluid 140 depends on the magnetic field that is applied.It is stable that viscosity change becomes.Thereby, the retarding torque of expectation stably can be inputed to actuator rotor 130.Optimized the motor phase place that phase-regulating mechanism 300 is regulated.Can guarantee the high reliability of valve timing controller 1.
[the 3rd embodiment]
As shown in figure 10, the 3rd embodiment is first embodiment's a modification.During the period " α ", " I α " is applied to coil 150 with steady current.Effective electric power in set period " RT " is high effectively electric power " W α ".As a result, shown in Figure 10 B, " B " is applied to magnetic viscosity fluid 140 with constant magnetic flux density.Magnetic viscosity fluid 140 is owing to the motion of magnetic-particle generates heat and receives heat from the coil 150 that generates heat according to high electric power " W α ".
During the period " β ", " I β " is applied to coil 150 with steady current.Effective electric power in set period " RT " is low effective electric power " W β ".Thereby magnetic viscosity fluid 140 is less generation heat during the period " β ".
Thereby, same in the 3rd embodiment, even magnetic viscosity fluid 140 is under the cryogenic conditions " SI ", when will starting, estimated engine guarantees to heat magnetic viscosity fluid 140.When engine start, the viscosity of magnetic viscosity fluid 140 depends on the magnetic field that is applied.Viscosity change becomes stable.Thereby, can be with the retarding torque of expectation the stable brake rotor 130 that inputs to.Optimized the motor phase place that phase-regulating mechanism 300 is regulated.Can guarantee the high reliability of valve timing controller 1.
[the 4th embodiment]
As shown in figure 11, the 4th embodiment is first embodiment's a modification.In the 4th embodiment's control flow, comprise step S400 and step S401.
Specifically, in step S400, computer determines whether the temperature of magnetic viscosity fluid is under the normal temperature conditions " Sn ", and under this normal temperature conditions, the temperature of magnetic viscosity fluid 140 is greater than lower limit temperature " TI ".
Till detecting normal temperature conditions " Sn ", the processing among repeated execution of steps S103 and the S400 is so that described magnetic viscosity fluid 140 generates heat effectively.Simultaneously, the answer in step S400 is when being, process proceeds to step S401, wherein stops along with motor and stops energising in the period " α ".Then, process proceeds to step S107, and wherein computer determines whether to generate engine start command " Os ".Should be noted that the fixed time " ST " that suitably changes current control circuit 200 becomes the situation that is lower than lower limit temperature " TI " with the temperature of avoiding magnetic viscosity fluid 140.
According to the 4th embodiment, from the moment that estimated engine will start, till the temperature of magnetic viscosity fluid exceeded " TI ", the magnetic viscosity fluid generated heat therein.Thereby when engine start, the viscosity of magnetic viscosity fluid depends on the magnetic field that is applied.
[the 5th embodiment]
As shown in figure 12, the 5th embodiment is the 4th embodiment's a modification.In the 5th embodiment's control flow, comprise that step S500 replaces step S400.
Specifically, in step S500, the heat that computer has determined whether to pass through appointment generates the period " HT ".Should be noted that in order to make magnetic viscosity fluid 140 enter the heat generation period " HT " that normal temperature conditions " Sn " needs appointment.Determine in advance that based on low frequency " f α " and high effectively electric power " W α " heat generates the period " HT ".
Till having passed through heat generation period " HT ", the processing among repeated execution of steps S103 and the S500 is so that magnetic viscosity fluid 140 generates heat effectively.Simultaneously, the answer in step S500 is when being, process proceeds to step S401, wherein stops along with motor and stops energising in the period " α ".Then, process proceeds to step S107, and wherein computer determines whether to generate engine start command " Os ".
According to the 5th embodiment, the moment when estimated engine will start, generate the period " HT " up to having passed through heat, the magnetic viscosity fluid generates heat therein.Thereby when engine start, the viscosity of magnetic viscosity fluid depends on the magnetic field that is applied.
[the 6th embodiment]
As shown in figure 13, the 6th embodiment is first embodiment's a modification.Second coil 650 that actuator 600 comprises described coil 150 and is used for generating at magnetic viscosity fluid 140 heat.
Specifically, second coil 150 is wrapped in around the coaxial resin spool 651 of lid part 112.When 650 energisings of second coil, generate magnetic field so that magnetic flux process lid part 112, the second magnetic gap 114b, rotor portion 132, the first magnetic gap 114a and fixed component 111.The magnetic field that is generated is applied to is positioned at magnetic gap 114a, the magnetic viscosity fluid 140 among the 114b.
Lid part 112 is exposed to the second magnetic gap 114b.Thereby if second coil 650 generates heat in when energising, then this heat is transferred to magnetic viscosity fluid 140 among the second magnetic gap 114b by resin spool 651 and lid part 112.In current embodiment, two main body 612a that lid part 112 is made by magnetic material, 612b constitutes.
The coil 150 and second coil 650 are electrically connected to current control circuit 620.Current control circuit 620 has and identical configuration and the function of current control circuit 200 among first embodiment.And then current control circuit 620 can be controlled the energising of second coil 650 independently with coil 150.
In the 6th embodiment's control flow, as shown in figure 14, comprise that step S600 replaces step S102.In step S600, second coil, 650 energisings during the period " α ".As a result, second coil 650 receives the electric power of low frequency " f α ", generates high electric power " W α ".According to beginning effective heating of magnetic viscosity fluid 140 with the similar mode of first embodiment.Till generating engine start command " Os ", magnetic viscosity fluid 140 generates heat effectively therein.
Thereby, same in the 6th embodiment, even magnetic viscosity fluid 140 is the glass transition state, when will starting, estimated engine makes 650 energisings of second coil, so that magnetic viscosity fluid 140 generates heat therein reliably.When engine start, second coil 650 is gone reliably.Thereby, in step S105, the 140 less reception heat affectings of magnetic viscosity fluid.As mentioned above, can suitably carry out the heat generation control and the viscosity control of magnetic viscosity fluid 140.
In above-mentioned the 6th embodiment, coil 150 is corresponding with viscosity control device of the present invention with current control circuit 620.And second coil 650 is corresponding with heating control device of the present invention with current control circuit 620.
[the 7th embodiment]
As shown in figure 15, the 7th embodiment is the 6th embodiment's a modification.In the 7th embodiment's control flow, comprise that step S700 is to step S703.
Specifically, in step S700, the crank of beginning motor rotates and in the period " β ", the energising during continuation period " α " is controlled.Then, process proceeds to step S105.
In step S701, computer determines whether changed the motor phase place after execution in step S105.Based on the variation that comes the calculation engine phase place from the output signal of crank angle sensor (not shown) and camshaft-signal sensor (not shown).When this variation exceeded specified amount " Δ θ ", computer determined to have changed the motor phase place.When detecting the variation of motor phase place in step S701, process proceeds to the step S701 that wherein makes second coil 650 remove electricity.Then, process proceeds to step S106.Thereby till having changed the motor phase place, magnetic viscosity fluid 140 generates heat therein effectively.
When detecting engine start command " Os " in step S107, process proceeds to step S703 and step 106.During the period " β ", coil 150 energisings.
According to the 7th embodiment, the moment when estimated engine will start begins till changing the motor phase place fully, and the magnetic viscosity fluid generates heat therein.Thereby when engine start, the viscosity of magnetic viscosity fluid depends on the magnetic field that is applied.
[other embodiment]
The present invention should not be limited to the disclosed embodiments, but can otherwise realize under the situation that does not depart from spirit of the present invention.
Specifically, at first, second, among the 4th to the 7th embodiment, during the period " β ", effective electric power can be set at and be greater than or equal to electric power " W α ", and frequency is changed to " f β " from " f α ".And, in the 3rd embodiment, during the period " β ", effective electric power can be set at and be greater than or equal to electric power " W α ".
In first, second and the 4th to the 7th embodiment, during period " α " and period " β ", can be directly or change frequency " f α ", " f β " indirectly.In first, second and the 4th to the 7th embodiment, during period " α " and period " β ", the frequency setting of electric current " I " can be changed to " W β " for being less than or equal to the effective electric power of frequency " f α " from " W α ".In the 6th and the 7th embodiment, the magnetic field that can be configured to be generated by second coil 650 less is applied to the magnetic viscosity fluid.Under these circumstances, needn't control the frequency of the electric current " I " that is fed to second coil 650.
At second, third, in the 6th and the 7th embodiment's the control flow,, can increase the processing of step S400 and S401 among the 4th embodiment between step S102 and the S103 or between step S600 and S103.When detecting normal temperature conditions " Sn " in step S400, process proceeds to step S401 and proceeds to step S107 then.And, at second, third, in the 6th and the 7th embodiment's the control flow,, can increase the processing of step S500 and S401 among the 5th (the 4th) embodiment between step S102 and the S103 or between step S600 and S103.When determining to have passed through the heating period " HT " in step S500, process proceeds to step S401 and proceeds to step S107 then.And, in the 6th and the 7th embodiment's control flow, can in step S600, carry out energising control among second embodiment or the 3rd embodiment's the step S102 at coil 650.
The configuration of phase-regulating mechanism 300 is suitably variable.
In first to the 7th embodiment, can change the direction of " shifting to an earlier date " and " delay " betwixt.The present invention also can be applicable to regulate the controller of the valve timing of exhaust valve, and the controller of regulating the valve timing of intake valve and exhaust valve.

Claims (12)

1. valve timing controller, it regulates the valve timing by the valve of torque opening/closing, and described torque is that the bent axle from internal-combustion engine is sent to camshaft, and described valve timing controller comprises:
Housing (110) limits fluid chamber (114) in this housing;
Be enclosed in the magnetic viscosity fluid (140) in the described fluid chamber, described magnetic viscosity fluid comprises magnetic-particle, and the viscosity of described magnetic viscosity fluid changes according to the magnetic field that is applied thereto;
Viscosity control device (150,200) is used for controlling the viscosity of described magnetic viscosity fluid (140) changeably by magnetic field being put on described magnetic viscosity fluid;
Brake rotor (130), described brake rotor rotatably are contained in the described fluid chamber (114) and receive the break torque of depending on its viscosity from described magnetic viscosity fluid;
Phase-regulating mechanism (300), described phase-regulating mechanism be connected to described brake rotor (130) and the described bent axle that is used for regulating described internal-combustion engine and described camshaft (2) according to the described break torque that inputs to described brake rotor (130) between relative rotatable phase; And
Heating control device (150,200), described heating control device are used for generating heat at described magnetic viscosity fluid (140) when estimating that described internal-combustion engine will start.
2. valve timing controller according to claim 1, wherein
When estimating that temperature that described internal-combustion engine will start and detect described magnetic viscosity fluid is lower than the required lower limit temperature of the described relative rotatable phase of change, described heating control device begins to heat described magnetic viscosity fluid to generate heat therein.
3. valve timing controller according to claim 1, wherein
Described heating control device comprises the coil (150) that is arranged in the described housing (110), and
When described coil (150) was switched on, the magnetic field of intensity variable was applied in described magnetic viscosity fluid, thereby generated described heat in described magnetic viscosity fluid.
4. valve timing controller according to claim 1, wherein
Described heating control device comprises the coil (150) that is arranged in the described housing (110), and when described coil (150) was switched on, described coil generated and is delivered to the heat of described magnetic viscosity fluid, thereby heats described magnetic viscosity fluid.
5. valve timing controller according to claim 3, wherein
Described heating control device makes described coil (150) energising put on the magnetic field of described magnetic viscosity fluid with generation, thereby controls the viscosity of described magnetic viscosity fluid changeably.
6. valve timing controller according to claim 5, wherein
When estimating that described motor will start, described heating control device is set first variable frequency in described magnetic field, and
When described engine start, described heating control device is set second variable frequency in described magnetic field, and described second variable frequency is higher than described first variable frequency.
7. valve timing controller according to claim 5, wherein
When estimating that described motor will start, described heating control device is set first electric power that is supplied to described coil, and
When described engine start, described heating control device is set second electric power that is supplied to described coil, and described second electric power is lower than described first electric power.
8. valve timing controller according to claim 3, wherein
Described heating control device also comprises second coil (650), and
Described viscosity control device makes described second coil (650) energising put on the magnetic field of described magnetic viscosity fluid with generation, thereby controls the viscosity of described magnetic viscosity fluid changeably.
9. valve timing controller according to claim 8, wherein
When described engine start, described viscosity control device is controlled the viscosity of described magnetic viscosity fluid so that change described relative rotatable phase, and
When the variation that detects described relative rotatable phase, described heating control device stops the described magnetic viscosity fluid of heating.
10. valve timing controller according to claim 1, wherein
Exceed when changing the required lower limit temperature of described relative rotatable phase in the temperature that detects described magnetic viscosity fluid, described heating control device stops the described magnetic viscosity fluid of heating.
11. valve timing controller according to claim 1, wherein
Increase to be higher than and change the required appointment heating of the required lower limit temperature of described relative rotatable phase during the period having passed through temperature with described magnetic viscosity fluid, described heating control device stops the described magnetic viscosity fluid of heating.
12. valve timing controller according to claim 1, wherein
When described engine starting, described heating control device stops the described magnetic viscosity fluid of heating.
CN2011101651237A 2010-06-11 2011-06-10 Valve timing controller Pending CN102278160A (en)

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Application publication date: 20111214