CN106401683B - Engine and vehicle with it - Google Patents
Engine and vehicle with it Download PDFInfo
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- CN106401683B CN106401683B CN201510451574.5A CN201510451574A CN106401683B CN 106401683 B CN106401683 B CN 106401683B CN 201510451574 A CN201510451574 A CN 201510451574A CN 106401683 B CN106401683 B CN 106401683B
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- driving member
- inlet valve
- clamping head
- engine
- cam
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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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
The invention discloses a kind of engine and with its vehicle, the engine includes: cylinder；Air intake duct, the air intake duct are connected with cylinder；Exhaust duct, the exhaust duct are connected with cylinder；Admission cam, the admission cam driving inlet valve is to open and close the air intake duct；Exhaust cam, the exhaust cam drive the exhaust valve to open and close the exhaust duct；Electronic inlet valve timing mechanism, the electronic inlet valve timing mechanism is connected with ECU, and the ECU controls the electronic inlet valve timing mechanism according to collected engine operating condition electric signal and adjusts the phase of the admission cam so that the exhaust gas of the predetermined amount in the exhaust duct to be discharged into the air intake duct.Engine of the present invention can quickly and accurately adjust valve timing, to reduce the discharge of NOx as much as possible.
Description
Technical field
The present invention relates to technical field of vehicle manufacture, in particular to a kind of engine and with the vehicle of the engine
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Background technique
Gas recirculation system (Exhaust Gas Recirculation) abbreviation EGR is the part for generating engine
Exhaust gas sends cylinder back to again.EGR gas due to inertia will retarded combustion process, so as to cause the pressure in combustion chamber
Forming process slows down, and then reduces oxynitrides (NOx), and improves the efficiency of combustion of fuel oil.
The mode of exhaust gas recycling at present has external EGR and two kinds of internal EGR.External EGR is to arrange the part of engine
Gas introduces air inlet pipe from exhaust pipe, by changing the ingredient of air inlet gas, achievees the purpose that reduce NOx emission.External EGR needs
There are external exhaust gas recirculation pipeline and control valve.Internal EGR is the variation using inlet and exhaust valve port timing, makes cylinder
Interior residual waste gas quantity increases, and achievees the purpose that reduce maximum combustion temperature to reduce NOx emission.
For internal EGR without the attachmentes such as external connecting pipe and EGR valve in structure, structure is simple, but existing internal EGR passes through
Hydraulic VVT (Variable Valve Timing, i.e. Variable Valve Timing Technique of IC Engine) changes valve timing realization, hydraulic
The response speed of VVT is slow, cannot quickly and accurately adjust valve timing, and the angle that valve overlap is adjusted is small, is adjustable
EGR amount variation range it is smaller, the ability for reducing DS NOx Est is limited, and there are rooms for improvement.
Summary of the invention
In view of this, the present invention is directed to propose a kind of engine, the problem of EGR amount must not be adjusted in real time with solution.
In order to achieve the above objectives, the technical scheme of the present invention is realized as follows:
A kind of engine, comprising: cylinder；Air intake duct, the air intake duct are connected with cylinder；Exhaust duct, the exhaust duct with
Cylinder is connected；Admission cam, the admission cam driving inlet valve is to open and close the air intake duct；Exhaust cam, it is described
Exhaust cam drives the exhaust valve to open and close the exhaust duct；Electronic inlet valve timing mechanism, the electronic air inlet
Door timing mechanism and ECU (Electronic Control Unit, i.e. electronic control unit) are connected, and the ECU is according to collecting
Engine operating condition electric signal control the electronic inlet valve timing mechanism and adjust the phase of the admission cam with by the row
The exhaust gas of predetermined amount in air flue is discharged into the air intake duct.
Further, the admission cam includes first cam and the second cam, and the admission cam can be described first
Switch between second state of inlet valve described in the first state of inlet valve described in actuated by cams and second actuated by cams, institute
The cam profile for stating the second cam such as includes at the lifts section, the exhaust gas of the predetermined amount in the exhaust duct be discharged into the air intake duct and
When the predetermined amount is greater than zero, the admission cam is in the second state.
Further, the electronic inlet valve timing mechanism adjusts the phase of the admission cam to change valve overlap
Angle, wherein the valve overlap is α, and 0 DEG C of A≤α≤100 DEG C A.
Further, the electronic inlet valve timing mechanism includes electromagnetic coil, the first driving member, the second driving member and bullet
Property return unit, the ECU control the energization or power-off of the electromagnetic coil, and institute according to collected engine operating condition electric signal
It states the first driving member and is arranged to collective effect lower edge institute in the elastic force of the magnetic force and dynamic clamping head and quiet clamping head of the electromagnetic coil
State the first driving member axis it is mobile when second driving member can be driven to rotate around the axis of first driving member, described the
Two driving members are connected with the admission cam and can rotate synchronously.
Further, the electromagnetic coil is powered and the magnetic force of the electromagnetic coil is greater than the elastic force of the dynamic clamping head and quiet clamping head
When, first driving member compresses the dynamic clamping head and quiet clamping head and along the axial to close to the electromagnetic coil of first driving member
Direction move through the second driving member and drive the admission cam towards the direction rotation that the inlet valve can be made to open in advance；
When the electromagnetic coil is powered and the magnetic force of the electromagnetic coil is equal to the elastic force of the dynamic clamping head and quiet clamping head, first driving member
It is opposing stationary with second driving member.
Further, when the electromagnetic coil powers off, first driving member is acted in the elastic force of the dynamic clamping head and quiet clamping head
The axial of first driving member described in lower edge moves through the second driving member driving to the direction far from the electromagnetic coil
The admission cam is rotated towards the direction that the inlet valve lag can be made to close.
Further, the electronic inlet valve timing mechanism further include: ring gear, the ring gear and the admission cam
It is connected and can rotates synchronously, first driving member is helical teeth bar, and second driving member includes engaging with the helical teeth bar
Helical teeth part and the spur gear part engaged with the ring gear.
Further, second driving member is multiple, and multiple second driving members are around the circumferential direction of first driving member
It is uniformly arranged.
Further, the electronic inlet valve timing mechanism further include: installation set, the electromagnetic coil are mounted on the peace
In encapsulation, the installation set is equipped with mounting groove, and a part and the dynamic clamping head and quiet clamping head of first driving member are respectively positioned on
In the mounting groove and the dynamic clamping head and quiet clamping head is folded in the bottom of described a part and the mounting groove of first driving member
Between wall.
Compared with the existing technology, engine of the present invention has the advantage that
(1) engine of the present invention, ECU according to engine operating condition electric signal control electronic inlet valve timing mechanism with
Valve can quickly and accurately be adjusted according to the different operating condition of engine by using automatically controlled mode by adjusting EGR amount in real time
Timing, to reduce the discharge of NOx as much as possible.
Another object of the present invention is to propose a kind of vehicle, comprising: the engine according to any of the above-described kind.
Possessed advantage is identical compared with the existing technology with above-mentioned engine for the vehicle, and details are not described herein.
Detailed description of the invention
The attached drawing for constituting a part of the invention is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the structural schematic diagram (showing ECU) of engine described in the embodiment of the present invention；
Fig. 2 is the cross-sectional view of electronic inlet valve timing mechanism described in the embodiment of the present invention；
Fig. 3 is the explosive view of electronic inlet valve timing mechanism described in the embodiment of the present invention；
Fig. 4 is valve timing diagram of the engine described in the embodiment of the present invention when EGR rate is zero, i.e., admission cam uses
Valve timing diagram when the first cam；
Fig. 5 is valve timing diagram of the engine described in the embodiment of the present invention when admission cam uses the second cam.
Description of symbols:
100- engine；1- camshaft sprocket；2- ring gear；201- bottom plate；202- peripheral wall；203- waist type groove；3- second
Driving member；301- helical teeth part；302- spur gear part；4- baffle；401- via hole；5- gasket；The first driving member of 6-；7- elasticity
Return unit；8- installation set；801- mounting groove；9- electromagnetic coil；10- outer cover plate；The electronic inlet valve timing mechanism of 11-；12- spark
Plug；13- fuel injector；14- air throttle；15- air flow meter；16- air inlet pressure sensor；17- crankshaft rotational speed sensor；18-
Exhaust cam shaft position sensor；19- admission cam shaft position sensor；20- PFE Exhaust Pressure Transducer；21- exhaust gas temperature passes
Sensor；22- intake air temperature sensor；23- air intake duct；24- exhaust duct；25- cylinder；26- inlet valve；27- exhaust valve；28-
The lifts section such as ECU, 29-；30- groove；31- protrusion；32- cylinder pin hole；33- straight pin；The lifting curve of E- exhaust cam；I-
The lifting curve of second cam.
Specific embodiment
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
Lean-burn conditions are a kind of high efficiency methods that engine 100 reduces oil consumption, to the emission treatment of EGR and exhaust gas
There is higher requirement.
The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
Engine 100 according to an embodiment of the present invention is described in detail with reference first to Fig. 1-Fig. 5.As Figure 1-Figure 5, start
Machine 100 includes cylinder 25, air intake duct 23, exhaust duct 24, admission cam (not shown go out), exhaust cam (not shown go out) and electronic
Inlet valve timing mechanism 11.
Wherein, air intake duct 23 is connected for supplying air inlet to cylinder 25 with cylinder 25, and air intake duct 23 is equipped with inlet valve 26
To control opening or closing for air intake duct 23.The exhaust gas that exhaust duct 24 is connected with cylinder 25 for cylinder 25 to be discharged, exhaust duct 24
Exhaust valve 27 is equipped with to control opening or closing for exhaust duct 24.Admission cam can drive inlet valve 26 to open and close
Air intake duct 23, exhaust cam can drive exhaust valve 27 to open and close exhaust duct 24.
It is understood that admission cam is located on admission cam shaft, exhaust cam is located on exhaust cam shaft, and air inlet
Camshaft and exhaust cam shaft are driven by the crankshaft of engine to be rotated, for example, being fixed with admission cam shaft on admission cam shaft
Sprocket wheel (such as camshaft sprocket 1 in Fig. 3) is fixed with exhaust cam shaft sprocket wheel on exhaust cam shaft, is fixed with song on crankshaft
Axis sprocket wheel, crankshaft sprocket and dmission cam shaft sprocket wheel and exhaust cam shaft sprocket wheel are by chain drive, thus when crank rotation
Admission cam shaft and exhaust cam shaft can be driven to rotate around respective rotation axis, can be realized admission cam and exhaust cam around
The rotation of respective rotation axis, to drive the opening and closing of intake and exhaust valves.
As shown in Figure 1, electronic inlet valve timing mechanism 11 is connected with ECU28, ECU28 is according to collected engine operating condition
Electric signal controls electronic inlet valve timing mechanism 11 and adjusts the phase of admission cam with by the exhaust gas of the predetermined amount in exhaust duct 24
It is discharged into air intake duct 23.
Optionally, engine operating condition electric signal may include charge flow rate signal, boost pressure signal, intake air temperature letter
Number, exhaust gas pressure signal, exhaust gas temperature signal, admission cam shaft position signal, exhaust cam shaft position signal, speed of crankshaft letter
Number equal signals.
Optionally, ECU28 can be with air flow meter 15, air inlet pressure sensor 16, intake air temperature sensor 22, exhaust
Pressure sensor 20, exhaust gas temperature sensor 21, admission cam shaft position sensor 19,18 and of exhaust cam shaft position sensor
Crankshaft rotational speed sensor 17 is connected, to acquire above-mentioned engine operating condition electric signal.
Specifically, that is, air flow meter 15 can as shown in Figure 1, air flow meter 15 is used to detect the flow value of air inlet
It is exported with converting charge flow rate signal for the flow value of air inlet to ECU；Air inlet pressure sensor 16 is for detecting air intake duct 23
The pressure value of interior gas, i.e. air inlet pressure sensor 16 can convert air inlet pressure for the pressure value of the gas in air intake duct 23
Force signal is exported to ECU；Intake air temperature sensor 22 is used to detect the temperature value of the gas in air intake duct 23, i.e. intake air temperature passes
Sensor 22 can convert intake air temperature signals for the temperature value of the gas in air intake duct 23 and export to ECU；Pressure at expulsion sensing
Device 20 is used to detect the pressure value of the gas in exhaust duct 24, i.e. back pressure transducer 20 can be by the gas in exhaust duct 24
Pressure value be converted into exhaust gas pressure signal and export to ECU；Exhaust gas temperature sensor 21 is used to detect the gas in exhaust duct 24
Temperature value, i.e. it is defeated can to convert exhaust gas temperature signal for the temperature value of the gas in exhaust duct 24 exhaust gas temperature sensor 21
Out to ECU；Admission cam shaft position sensor 19 is used to detect the position of admission cam shaft, and the position of admission cam shaft is turned
Admission cam shaft position signal is turned to export to ECU；Exhaust cam shaft position sensor 18 is used to detect the position of exhaust cam shaft
It sets, and converts exhaust cam shaft position signal for the position of exhaust cam shaft and export to ECU；Crankshaft rotational speed sensor 17 is used for
The tachometer value of crankshaft is detected, and converts speed of crankshaft signal for the tachometer value of crankshaft and exports to ECU.
It will be appreciated by persons skilled in the art that for VVT gear, the sensor and its
The corresponding signal of acquisition is known.
When engine 100 is in lean-burn conditions, ECU28 is according to the specific difference of 100 lean burn of engine
Operating condition real-time control EGR amount, in other words, ECU28 calculates the exhaust gas that is discharged into air intake duct 23 according to engine operating condition electric signal
Predetermined amount, electronic inlet valve timing mechanism 11 is controlled according to predetermined amount ECU28 and then adjusts the phase of admission cam, with
Admission cam is set to open inlet valve 26 in advance when needing, engine 100 is also in exhaust stroke, the piston of engine 100 at this time
Top dead centre is not reached, that is, produces valve overlap.Exhaust duct 24 is connected to air intake duct 23 by cylinder 25, at this point, row
Pressure in air flue 24 is greater than the pressure in air intake duct 23, and the exhaust gas in exhaust duct 24 is discharged into air intake duct under the action of pressure difference
In 23, when next suction stroke, the exhaust gas being discharged into air intake duct 23 enters together with fresh air participates in burning in cylinder 25.
When engine 100 is in big load, ECU28 controls electronic inlet valve positive opportunity according to engine operating condition electric signal
Structure 11 makes exhaust gas be not involved in recycling, even if the predetermined amount of exhaust gas is zero, EGR rate zero.
That is, ECU28 can according to the revolving speed of engine 100, load, temperature difference and adjust participation recycling
Exhausted air quantity is minimum to reach DS NOx Est.
In short, engine 100 according to an embodiment of the present invention, ECU28 controls electronic according to engine operating condition electric signal
Inlet valve timing mechanism 11, by using automatically controlled mode, can quickly and accurately adjust valve just to adjust EGR amount in real time
When, that is to say, that engine 100 can adjust EGR amount according to engine operating condition in real time, to reduce the discharge of NOx as much as possible.
Optionally, engine may include spark plug 12, fuel injector 13 and air throttle 14, and ECU28 can be according to engine
The work of operating condition electric signal control spark plug 12, fuel injector 13 and air throttle 14.
Optionally, the phase of the adjustable admission cam of electronic inlet valve timing mechanism 11 to be to change valve overlap,
Middle valve overlap is α, and α can satisfy: 0 DEG C of A≤α≤100 DEG C A.The range of valve overlap is big as a result, to make EGR
The adjustable range of amount is big, advantageously reduces the discharge of NOx, optimizes the efficiency of combustion of engine 100.
Some preferred embodiments according to the present invention, as shown in Figures 2 and 3, electronic inlet valve timing mechanism 11 can be with
Including electromagnetic coil 9, the first driving member 6, the second driving member 3 and dynamic clamping head and quiet clamping head 7.
ECU28 controls the energization or power-off of electromagnetic coil 9, and the first transmission according to collected engine operating condition electric signal
Part 6 is arranged to the axis in the first driving member of collective effect lower edge 6 of the elastic force of the magnetic force and dynamic clamping head and quiet clamping head 7 of electromagnetic coil 9
The second driving member 3 can be driven to rotate when mobile around the axis of the first driving member 6, the second driving member 3 is connected with admission cam and can
It rotates synchronously.
In other words, ECU28 calculates the predetermined amount for the exhaust gas being discharged into air intake duct 23 according to engine operating condition electric signal, according to
Predetermined amount ECU28 controls electronic inlet valve timing mechanism 11 and adjusts port timing.Specifically, ECU28 can control it is electronic into
The energization or power-off of the electromagnetic coil 9 of valve timing mechanism 11, the energization of electromagnetic coil 9 can produce magnetic force, the first driving member 6 by
To the force action of the elastic force of the magnetic force and dynamic clamping head and quiet clamping head 7 of electromagnetic coil 9, the first driving member 6 can under the action of the resultant force
It is moved with the axis along the first driving member 6, the first driving member 6 and the second driving member 3 are cooperatively connected, and the first driving member 6 is along first
When the axis of driving member 6 is mobile, the second driving member 3 can be rotated around the axis of the first driving member 6, and then be driven and the second transmission
The connected admission cam linkage of part 3, i.e. the second driving member 3 can drive admission cam around synchronous turn of rotation axis of admission cam shaft
It is dynamic, to adjust the phase of admission cam to change valve overlap, control EGR amount.
It is understood that the magnetic field that electromagnetic coil 9 generates can be applied to the first driving member 6 when electromagnetic coil 9 is powered
Add magnetic force, depending on the energization polarity of electromagnetic coil 9, such as in some alternative embodiments, magnetic force can in the direction of magnetic force
So that the first driving member 6 towards the direction activity close to dynamic clamping head and quiet clamping head 7 with elasticity of compression return unit 7, until the first driving member 6 by
The magnetic force arrived and elastic dynamic balance；In other optional embodiments, magnetic force can make the first driving member 6 towards far from elastic multiple
The direction activity of position part 7 is with tensile elasticity return unit 7, until magnetic force and elasticity dynamic balance that the first driving member 6 is subject to.In electromagnetism
When coil 9 powers off, the elastic force of dynamic clamping head and quiet clamping head 7 restores the first driving member 6.
The present invention is made further by taking 6 elasticity of compression return unit 7 of the first driving member when electromagnetic coil 9 is powered as an example below
Explanation.
Optionally, as shown in Fig. 2-Fig. 3, when electromagnetic coil 9 is powered, if electromagnetic coil 9 is big to the magnetic force of the first driving member 6
In dynamic clamping head and quiet clamping head 7 to the elastic force of the first driving member 6, the first driving member 6 can be with elasticity of compression return unit 7, and the first driving member 6
It can be moved along the axial direction to close to electromagnetic coil 9 of the first driving member 6.First driving member 6 can pass through the second transmission
Part 3 drives admission cam towards the direction rotation that inlet valve 26 can be made to open in advance.
In other words, when the first driving member 6 is moved along the axis of the first driving member 6 to the direction close to electromagnetic coil 9, second
Driving member 3 can be rotated around the axis of the first driving member 6, and then drive turn synchronous with the admission cam that the second driving member 3 is connected
Dynamic, admission cam rotates forward in advance, to adjust the phase of admission cam to change valve overlap, shifts to an earlier date inlet valve 26
It opens, to control EGR amount.
Electromagnetic coil 9 is powered, and is driven if electromagnetic coil 9 is equal to dynamic clamping head and quiet clamping head 7 to the magnetic force of the first driving member 6 to first
The elastic force of part 6, the first driving member 6 and the second driving member 3 are opposing stationary, i.e., the first driving member 6 is synchronous with the second driving member 3 at this time
Axis around the first driving member 6 rotates, specifically, admission cam is connected and can rotate synchronously with the second driving member 3, and crankshaft
Admission cam shaft rotation is driven by the chain conveyer of camshaft sprocket 1 and crankshaft sprocket, i.e. drive admission cam is around admission cam
The rotation axis of axis rotates, that is to say, that camshaft sprocket 1 can be rotated synchronously with the second driving member 3, when electromagnetic coil 9 is right
When the magnetic force of first driving member 6 is equal to elastic force of the dynamic clamping head and quiet clamping head 7 to the first driving member 6, inlet valve timing adjusting has been completed,
Rotation axis rotation of the admission cam under the drive of crankshaft around admission cam shaft is to drive inlet valve 26 to act, to beat on and off
Close air intake duct 23.
More specifically, in order to guarantee that electromagnetic coil 9 is equal to dynamic clamping head and quiet clamping head 7 to first to the magnetic force of the first driving member 6
The elastic force of driving member 6, after the completion of inlet valve timing is adjusted, ECU is protected to the duty ratio of the signal of electronic inlet valve timing mechanism 11
It holds constant.
When electromagnetic coil 9 powers off, axis of first driving member 6 in elastic force effect the first driving member of lower edge 6 of dynamic clamping head and quiet clamping head 7
The lag of inlet valve 26 can be made to close to the second driving member 3 driving admission cam court is moved through to the direction far from electromagnetic coil 9
The direction rotation closed.
It is understood that the magnetic force that the first driving member 6 is subject to disappears, dynamic clamping head and quiet clamping head 7 after electromagnetic coil 9 powers off
Elastic force can be such that the first driving member 6 restores, that is, make the first driving member 6 along the axial to far from electromagnetic wire of the first driving member 6
The direction of circle 9 is mobile, and the first driving member 6 can drive admission cam court that the lag of inlet valve 26 can be made to close by the second driving member 3
The direction rotation closed.
In other words, the first driving member 6 along the axis of the first driving member 6 move to far from electromagnetic coil 9 direction when, second
Driving member 3 can be rotated around the axis of the first driving member 6, and then drive the admission cam linkage being connected with the second driving member 3, into
Gas cam rotates backward, to adjust the phase of admission cam to change valve overlap, closes the lag of inlet valve 26.
As shown in Figures 2 and 3, electronic inlet valve timing mechanism 11 can also include ring gear 2, and the second driving member 3 can be with
It is connected with ring gear 2, ring gear 2 is connected with admission cam and can rotate synchronously, such as ring gear 2 and camshaft sprocket 1 can be with
Rigid connection, camshaft sprocket 1 can be rotated synchronously with admission cam, and the second driving member 3 is connected with ring gear 2 again, thus second
Driving member 3 can be rotated synchronously with camshaft sprocket 1 and admission cam.
Specifically, as shown in Figures 2 and 3, the first driving member 6 can be helical teeth bar, and the second driving member 3 can be composite teeth
Wheel, and the second driving member 3 may include helical teeth part 301 and spur gear part 302, helical teeth part 301 can be nibbled with helical teeth bar
It closes, spur gear part 302 can be engaged with the straight-tooth of ring gear 2.
It is understood that the worm and gear similar with the relationship that helical teeth bar engages of helical teeth part 301, i.e., in helical teeth bar along tiltedly
When the axis of ratch is mobile, helical teeth part 301 can be rotated around the axis of helical teeth bar.
Further, as shown in Figures 2 and 3, ring gear 2 may include bottom plate 201 and peripheral wall 202, and the second driving member 3 can
To be located at the installation space that bottom plate 201 and peripheral wall 202 limit, make spur gear part 302 and the ring gear 2 of the second driving member 3
Peripheral wall 202 engage.Camshaft sprocket 1 can be equipped with groove 30, and ring gear 2 can be located in groove 30, and the bottom of groove 30
Wall is equipped with the protrusion 31 of annular, and protrusion 31 is equipped with cylinder pin hole 32, can be equipped with waist type groove on the bottom plate 201 of ring gear 2
203, the second driving member 3 is equipped with straight pin 33, and the second driving member 3 is protruded in one end towards camshaft sprocket 1 of straight pin 33
The end face towards camshaft sprocket 1, straight pin 33 towards electromagnetic coil 9 one end protrude the second driving member 3 direction electricity
Two end faces of the second driving member 3, the protrusion of camshaft sprocket 1 are protruded in the end face of magnetic coil 9, the i.e. both ends of straight pin 33 respectively
31 can pass through waist type groove 203 and the cooperation of the second driving member 3, specifically, the protrusion 31 of camshaft sprocket 1 passes through ring gear 2,
And the one end fits of the protrusion towards camshaft sprocket 1 of straight pin 33 are in cylinder pin hole 32 so that the second driving member 3 with it is convex
Wheel shaft sprocket wheel 1 links.
Optionally, as shown in figure 3, the second driving member 3 can be multiple, and multiple second driving members 3 can be passed around first
The circumferential direction of moving part 6 is uniformly arranged.Specifically, the second driving member 3 can be three.
Optionally, the fixing groove of annular protrusion, 203 annular of waist type groove and annular is multiple and corresponds, and is changed
The number of Yan Zhi, annular protrusion, 203 annular of waist type groove and the second driving member 3 are equal, and second driving member 3 is equipped with
One annular fixing groove, and the annular corresponding waist type groove 203 of protrusion and an annular fixing groove.Multiple annulars
Protrusion being arranged circumferentially around camshaft sprocket 1, similarly multiple waist type grooves 203 can around ring gear 2 it is circumferential
Even arrangement.
Further, as shown in Figure 2 and Figure 3, electronic inlet valve timing mechanism 11 can also include installation set 8, electromagnetic wire
Circle 9 may be mounted in installation set 8, and mounting groove 801, a part and elasticity of the first driving member 6 can be equipped in installation set 8
Return unit 7 can be respectively positioned in mounting groove 801, and dynamic clamping head and quiet clamping head 7 can be folded in a part and installation of the first driving member 6
Between the bottom wall of slot 801, to apply elastic force to the first driving member 6.
Optionally, dynamic clamping head and quiet clamping head 7 can be return spring.
Optionally, as shown in Figure 2 and Figure 3, electronic inlet valve timing mechanism 11 can also include outer cover plate 10, outer cover plate 10
It is connected with installation set 8 to prevent electromagnetic coil 9 from falling off from installation set 8.
Further, as shown in Figure 2 and Figure 3, electronic inlet valve timing mechanism 11 can also include baffle 4 and gasket 5.Its
In, can be equipped with via hole 401 on baffle 4, the first driving member 6 can sequentially pass through gasket 5 and via hole 401 and with the second driving member
3 cooperations, and the diameter of only one end to dynamic clamping head and quiet clamping head 7 of the first driving member 6 is greater than the aperture of gasket 5, the outer diameter of gasket 5 is big
In the width of via hole 401, baffle 4 is fixed in installation set 8 to prevent the first driving member 6 and dynamic clamping head and quiet clamping head 7 from completely disengaging peace
The mounting groove 801 of encapsulation 8.
In brief, engine 100 according to an embodiment of the present invention, ECU28 are calculated according to the signal of each sensor and are arranged
The predetermined amount for entering the exhaust gas in air intake duct 23, according to the predetermined amount, ECU28 controls electronic inlet valve timing mechanism 11, it is electronic into
The course of work of valve timing mechanism 11 is as follows:
ECU28 outputs signal to motor, and motor is powered or powers off to electronic inlet valve timing mechanism 11.
When electromagnetic coil 9 is powered, if electromagnetic coil 9 is greater than elastic reset to the magnetic force of helical teeth bar (i.e. the first driving member 6)
Part 7 is to the elastic force of helical teeth bar, and helical teeth bar can be with elasticity of compression return unit 7, and helical teeth bar can be along the axial to close of helical teeth bar
The direction of electromagnetic coil 9 is mobile, and compound gear (i.e. the second driving member 3) can be rotated around the axis of helical teeth bar, and then in drive
Gear ring 2 and camshaft sprocket 1 rotate, and camshaft sprocket 1 can drive admission cam to rotate, admission cam can be made to shift to an earlier date as a result,
It rotates forward, to adjust the phase of admission cam to change valve overlap, opens inlet valve 26 in advance, to control EGR
Amount.
When electromagnetic coil 9 is powered, if electromagnetic coil 9 is equal to dynamic clamping head and quiet clamping head 7 to the bullet of helical teeth bar to the magnetic force of helical teeth bar
Power, helical teeth bar and compound gear are opposing stationary, i.e., helical teeth bar, compound gear are connected by ring gear 2 and the rigidity of camshaft sprocket 1
It connects and is rotated synchronously with camshaft sprocket 1.
After electromagnetic coil 9 powers off, the magnetic force that helical teeth bar is subject to disappears, and the elastic force of dynamic clamping head and quiet clamping head 7 can make helical teeth bar edge
Helical teeth bar it is axial mobile to the direction far from electromagnetic coil 9, helical teeth bar can by compound gear drive cam shaft sprocket wheel 1 with
It drives admission cam to rotate backward, to adjust the phase of admission cam to change valve overlap, closes the lag of inlet valve 26
It closes.
Some preferred embodiments according to the present invention, as shown in figure 4, admission cam may include the first cam and second
Cam, admission cam can be in the first state of the first actuated by cams inlet valve 26 and the second shapes of the second actuated by cams inlet valve 26
Switch between state, the lifts section 29 such as the cam profile of the second cam includes, the exhaust gas of the predetermined amount in exhaust duct 24 is discharged into air inlet
In road 23 and when the predetermined amount is greater than zero, admission cam is in the second state.
In other words, the working condition of admission cam includes first state and the second state.Wherein, admission cam is in first
When state, the first cam can drive inlet valve 26, and when admission cam is in the second state, the second cam can drive inlet valve
26, i.e., inlet valve 26 can be driven by only having one in first cam and the second cam, cannot drive inlet valve 26 simultaneously.First cam
To those skilled in the art with the switching construction of the second cam, existing structure, then this no longer narration in detail can be used.
It is understood that since internal EGR is higher than the temperature of external EGR, and high temperature is conducive to the generation of NOx, it is internal
EGR similarly reduces the effect of NOx emission in order to obtain with outside EGR, it is necessary to increase internal egr amount, i.e., in increase cylinder 25
Exhausted air quantity, but the exhausted air quantity increased in cylinder 25 will affect fresh air charge, and then influence the full combustion of fuel oil.
In order to solve this problem, engine 100 according to an embodiment of the present invention, passes through the predetermined amount in exhaust duct 24
Exhaust gas be discharged into air intake duct 23 and when predetermined amount is greater than zero, so that admission cam is switched to the second state, that is, use the second cam,
As can be seen from Figure 4 and Figure 5, when using the second cam, inlet valve is relatively used and can be opened in advance when the first cam, and such as Fig. 5
It is shown, due to the second cam cam profile include etc. lifts section 29, this stablizes 26 lift of inlet valve in a certain value
It is constant, it can guarantee in the case where increasing internal egr amount as a result, air inflow (fresh air), stablize the output of engine 100
The discharge of power, NOx can reduce by 25%.
In conclusion engine 100 according to an embodiment of the present invention, can reduce pipeline and intercooler using internal EGR
Equal components, convenient for the arrangement and reduction production cost of the components of engine 100, and the temperature of internal EGR is higher, opens cold
When dynamic the temperature of air inlet can increase, accelerate the burning velocity in cylinder 25, reduce hydrocarbon emission about 35%, while internal EGR
Exhaust gas temperature is high, can increase about 40K, is conducive to exhaust after-treatment.By using electronic inlet valve timing mechanism 11, that is, pass through electricity
The mode of control adjusts valve timing, and engine 100 can adjust EGR amount according to engine operating condition in real time, can be quickly and accurately
Adjust valve timing, to reduce the discharge of NOx as much as possible, by be arranged have etc. lifts section 29 the second cam, Ke Yibao
The air inflow for demonstrate,proving fresh air makes fuel oil that can stablize the output power of engine 100 with full combustion, and the discharge of NOx can drop
Low 25%, and solve the problems, such as to can not achieve high EGR rate using conventional interior EGR under engine underpressure combustion conditions.
In addition, electronic inlet valve timing mechanism 11 is more accurate compared to the adjusting of hydraulic inlet valve timing mechanism, and adjust
Speed it is fast, 250CA °/S can be reached.Valve timing is changed using electronic inlet valve timing mechanism 11, it can be fast, accurately
Change internal EGR rate.
Vehicle according to an embodiment of the present invention is described below.
Vehicle according to an embodiment of the present invention includes any engine 100 of above-described embodiment description.
Vehicle according to an embodiment of the present invention can reduce starting for vehicle by making engine 100 using internal EGR
The production cost of machine 100 can reduce hydrocarbon emission in vehicle cold-start conducive to the arrangement of components.By using electronic
Inlet valve timing mechanism 11, valve overlap angle adjustable range is big, and can quickly and accurately adjust valve timing, Ke Yigen
EGR amount is adjusted in real time according to engine operating condition, to reduce the discharge of NOx as much as possible, has etc. the of lifts section 29 by being arranged
Two cams, it is ensured that the air inflow of fresh air makes fuel oil that can stablize the output power of engine 100 with full combustion,
The discharge of NOx can reduce by 25%.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of engine (100) characterized by comprising
Cylinder (25)；
Air intake duct (23), the air intake duct (23) are connected with cylinder (25)；
Exhaust duct (24), the exhaust duct (24) are connected with cylinder (25)；
Admission cam, admission cam driving inlet valve (26) is to open and close the air intake duct (23)；
Exhaust cam, the exhaust cam drive the exhaust valve (27) to open and close the exhaust duct (24)；
Electronic inlet valve timing mechanism (11), the electronic inlet valve timing mechanism (11) are connected with ECU (28), the ECU
(28) convex according to collected engine operating condition electric signal control electronic inlet valve timing mechanism (11) adjusting air inlet
The phase of wheel is the exhaust gas of the predetermined amount in the exhaust duct (24) to be discharged into the air intake duct (23), the electronic inlet valve
Timing mechanism (11) includes electromagnetic coil (9), the first driving member (6), the second driving member (3) and dynamic clamping head and quiet clamping head (7), described
ECU (28) controls the energization or power-off of the electromagnetic coil (9), and described first according to collected engine operating condition electric signal
Driving member (6) is arranged to the collective effect lower edge in the elastic force of the magnetic force and dynamic clamping head and quiet clamping head (7) of the electromagnetic coil (9)
The axis of first driving member (6) can drive second driving member (3) around the axis of first driving member (6) when mobile
Rotation, second driving member (3) are connected with the admission cam and can rotate synchronously.
2. engine (100) according to claim 1, which is characterized in that the admission cam includes the first cam and the
Two cams, admission cam first state of inlet valve (26) described in first actuated by cams and second cam
It drives and switches between the second state of the inlet valve (26), the lifts section (29) such as the cam profile of second cam includes,
When the exhaust gas of predetermined amount in the exhaust duct (24) is discharged into the air intake duct (23) and the predetermined amount is greater than zero, it is described into
Gas cam is in the second state.
3. engine (100) according to claim 1, which is characterized in that the electronic inlet valve timing mechanism (11) is adjusted
The phase of the admission cam is saved to change valve overlap, wherein the valve overlap is α, and 0 DEG C of A≤α≤100 DEG C A.
4. engine (100) according to claim 1, which is characterized in that the electromagnetic coil (9) is powered and the electromagnetism
When the magnetic force of coil (9) is greater than the elastic force of the dynamic clamping head and quiet clamping head (7), first driving member (6) compresses the elastic reset
Part (7) and the second transmission is moved through along the axial direction to close to the electromagnetic coil (9) of first driving member (6)
Part (3) drives the admission cam towards the direction rotation that the inlet valve (26) can be made to open in advance；
When the electromagnetic coil (9) is powered and the magnetic force of the electromagnetic coil (9) is equal to the elastic force of the dynamic clamping head and quiet clamping head (7),
First driving member (6) and second driving member (3) are opposing stationary.
5. engine (100) according to claim 4, which is characterized in that when the electromagnetic coil (9) powers off, described the
One driving member (6) acts on the axial to far from described of the first driving member (6) described in lower edge in the elastic force of the dynamic clamping head and quiet clamping head (7)
The direction of electromagnetic coil (9) moves through second driving member (3) and drives the admission cam court that can make the inlet valve
(26) the direction rotation that lag is closed.
6. engine (100) according to claim 1, which is characterized in that the electronic inlet valve timing mechanism (11) is also
It include: ring gear (2), the ring gear (2) is connected with the admission cam and can rotate synchronously, first driving member (6)
For helical teeth bar, second driving member (3) includes the helical teeth part engaged with the helical teeth bar and engages with the ring gear (2)
Spur gear part.
7. engine (100) according to claim 6, which is characterized in that second driving member (3) is multiple and more
A second driving member (3) is uniformly arranged around the circumferential direction of first driving member (6).
8. engine (100) according to claim 1, which is characterized in that the electronic inlet valve timing mechanism (11) is also
It include: installation set (8), the electromagnetic coil (9) is mounted in the installation set (8), and the installation set (8) is equipped with mounting groove
(801), a part and the dynamic clamping head and quiet clamping head (7) of first driving member (6) be respectively positioned in the mounting groove (801) and
The dynamic clamping head and quiet clamping head (7) be folded in first driving member (6) described a part and the bottom wall of the mounting groove (801) it
Between.
9. a kind of vehicle characterized by comprising engine (100) according to claim 1 to 8.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101772630A (en) * | 2007-08-09 | 2010-07-07 | 丰田自动车株式会社 | Control apparatus and control method for internal combustion engine |
| CN104343548A (en) * | 2013-08-09 | 2015-02-11 | 爱信精机株式会社 | Engine control mechanism |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4218359B2 (en) * | 2003-02-05 | 2009-02-04 | トヨタ自動車株式会社 | Control device for internal combustion engine |
| IN2014DN07081A (en) * | 2012-02-23 | 2015-04-10 | Jacobs Vehicle Systems Inc |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101772630A (en) * | 2007-08-09 | 2010-07-07 | 丰田自动车株式会社 | Control apparatus and control method for internal combustion engine |
| CN104343548A (en) * | 2013-08-09 | 2015-02-11 | 爱信精机株式会社 | Engine control mechanism |
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