CN105156166B - The quick VVT and VVL devices of piezo-electric crystal electric-controlled hydraulic and its control method - Google Patents
The quick VVT and VVL devices of piezo-electric crystal electric-controlled hydraulic and its control method Download PDFInfo
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- CN105156166B CN105156166B CN201510505947.2A CN201510505947A CN105156166B CN 105156166 B CN105156166 B CN 105156166B CN 201510505947 A CN201510505947 A CN 201510505947A CN 105156166 B CN105156166 B CN 105156166B
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Abstract
The invention discloses a kind of quick VVT and VVL devices of piezo-electric crystal electric-controlled hydraulic, including piezo-electric crystal controlling organization, inlet valve mechanism, hydraulic mechanism, high-low pressure oil circuit mechanism and ECU；Piezo-electric crystal controlling organization and hydraulic mechanism are separately positioned on both sides in a cylindrical shell；The core of valve variable technique is used as using piezo-electric crystal controlling organization, hydraulic cavities are connected by the effect of high-low pressure oil circuit, hydraulic cavities are connected with a piston, piston is promoted using exhaust valve side camshaft, and then inlet valve is driven, accurate valve control is realized, ECU depressurizes valve openings according to the different controls of operating mode, the deformation of high pressure oil pressure and piezo-electric crystal is adjusted, so as to realize VVT, VVL.By the above-mentioned means, the present invention is by the ingenious fusion of VVT and VVL technologies, while the fast response characteristic and the Flexible Control of electronic control technology of piezo-electric crystal, preferably can make valve event match with operating condition, the economy and stability of engine work are improved.
Description
Technical field
The present invention relates to field of internal combustion engine, more particularly to internal combustion engine working process is controlled, and specifically one kind is related to
The quick valve variable timing (VVT) of electric-controlled hydraulic and valve variable lift (VVL) device.
Background technology
The port timing mechanism of engine is responsible for fresh air necessary to providing gasoline combustion acting to cylinder, and will combustion
After burning waste gas discharge, from operation principle, the major function of port timing mechanism be opened according to certain time limit and
The inlet and outlet door of each cylinder is closed, so as to realize the whole process of cylinder ventilation supply.For there is no changeable air valve skill
For the common engine of art, intake and exhaust opening/closing time and lift are all fixed, and the port timing of internal combustion engine can not basis
The rotating speed of internal combustion engine and change, this changeless valve timing and lift are difficult in different rotating speeds operating mode with respect to engine
When need of work.Therefore in order to meet the job requirement of engine full working scope it is necessary to design changeable air valve, lifting engine
Power is showed, and makes burning more efficiently.
VVT technologies change the changeless state of port timing in conventional engines, in engine operating condition scope
It is interior that optimal valve timing is provided, preferably solve high rotating speed and dynamic property under the slow-speed of revolution, big load and Smaller load and economy
Property contradiction, while improve to a certain extent waste gas discharge.VVL technologies can be in engine different rotating speeds, different load
When match suitable valve stroke so that engine in the slow-speed of revolution, Smaller load use less valve stroke, improve cold start-up
With reduction oil consumption.Using larger valve stroke when high rotating speed, big load, valve throttling loss is reduced, charging efficiency is improved, carries
Power output of the high engine in high rotating speed, big load simultaneously can reduce the fuel consumption of engine, improve fuel economy, drop
Low HC, NOx discharge.
At present, VVT and VVL technologies are widely applied in field of internal combustion engine, if the i-VTEC systems of Honda
It is the application of typical VVL technologies in the car, realizes the valve stroke change of complexity, but the 3rd rocking arm of increase and the
The mechanism of three camshafts makes its mechanical system more complicated, and the valve adjustments mode of segmented makes its power output inadequate
Linearly；BMW Valvetronic systems add eccentric shaft in traditional port timing mechanism, and stepper motor and centre are pushed away
The parts such as bar, the system then cleverly changes after a series of machine drivings inlet valve lift by the rotation of stepper motor
Size, but lift size can only be changed within the specific limits, and also it is correct to be in how in the correct time valve stroke
Position be the technology difficult point；The AVS systems of Audi and the VVTL-i technologies of Toyota etc. are all representational changeable air valves
Technology, but be due to error and abrasion that Machinery Control System exists in itself, these systems still have deficiency, therefore valve can
The control of change technology needs to tilt to electronic control technology, the Multiair electric-controlled hydraulic gas handling systems of such as Fiat, has used automatically controlled
Hydraulic control system drives timing and the lift of valve, but eliminates inlet valve side camshaft, the camshaft of exhaust valve side
Inlet valve is driven by hydraulic mechanism, but structure is more complicated, and control a magnetic valve to realize simultaneously using ECU
VVT and VVL also add the difficulty of control to a certain extent.
The content of the invention
Present invention mainly solves the problem of be the electrodeless adjustable of engine valve timing and lift in actual motion, pass through profit
Normal port timing is realized with exhaust side camshaft and piston, hydraulic mechanism, piezo-electric crystal controlling organization and high-low pressure is utilized
Oil circuit mechanism realizes VVT and VVL, reduces the difficulty of electrical control mechanism control, and the fast response characteristic of piezo-electric crystal becomes valve
Change is rapider, enhances adaptability of the engine to different operating modes, and the arrangement of mechanical structure reduces valve actuating mechanism
Inertia, reduces energy loss when running at high speed.
In order to solve the above-mentioned technical problem, a kind of quick VVT of piezo-electric crystal electric-controlled hydraulic and VVL dress proposed by the present invention
Put, including piezo-electric crystal controlling organization, inlet valve mechanism, hydraulic mechanism, high-low pressure oil circuit mechanism and Engine ECU；It is described
Piezo-electric crystal controlling organization and the hydraulic mechanism are separately positioned on the both sides in a cylindrical shell；The middle part of the cylindrical shell
Provided with four oil circuit vias；The piezo-electric crystal controlling organization includes the piezo-electric crystal heap, displacement amplifier, amplification set gradually
Chamber and first piston, the side of the piezo-electric crystal heap and the housing are fixed；The diameter of the displacement amplifier chamber is big
Between the diameter of amplifying chamber, the piezo-electric crystal heap and the displacement amplifier and the displacement amplifier and described
Return spring is respectively provided between one piston；The displacement amplifier chamber and the amplifying chamber insertion；The air inlet
Door mechanism includes valve lifter；The hydraulic mechanism includes the hydraulic cavities of a closing, and the hydraulic cavities are by being arranged on the circle
In post housing and moveable space between first baffle and second baffle is constituted, and the first baffle is endured with the valve
Bar is connected；Camshaft is provided with the side of exhaust valve, the camshaft drives a second piston by rocking arm, and the rocking arm is used
Dies, increase the intensity of rocking arm, and rocking arm connecting pin uses solid circle pin, and the second piston drives one to be arranged on
Circular push pedal in one hydraulic cylinder, the circular push pedal have with the hydraulic cylinder identical diameter, the hydraulic cylinder with it is described
Hydraulic cavities insertion；The high-low pressure oil circuit mechanism includes high-pressure oil passage passage and low pressure oil way passage and is arranged in cylindrical shell
One pilot valve and center control unit in portion；The pilot valve is provided with return chamber, and the return intracavitary is provided with servo control
Valve return spring processed；The center control unit includes the first chamber and second chamber divided by a baffle plate, the first chamber
It is interior to be provided with baffle plate return spring；One end of the high-pressure oil passage passage and the low pressure oil way passage is respectively connected to hydraulic oil
Rail, the other end of the high-pressure oil passage passage is penetrated in cylindrical shell by two oil circuit vias and is divided into three branch roads to be connected respectively
It is connected to the amplifying chamber, the return chamber and second chamber；Connect and set on the high-pressure oil passage branched bottom A of the amplifying chamber
There is electronic control pressure reducing valve；The other end of the low pressure oil way passage is penetrated in cylindrical shell and is divided into by two other oil circuit via
Two branch roads are respectively connecting to the pilot valve and first chamber；Connect the low pressure oil way branched bottom of the first chamber
B is provided with stop valve；A bypass C is connected between the valve body of the pilot valve and the first chamber；The servo control
Valve processed is connected with the first piston；The piezo-electric crystal heap and the electronic control pressure reducing valve, and the stop valve is with starting
Machine ECU couples.
A kind of quick VVT and VVL control methods of piezo-electric crystal electric-controlled hydraulic are invented, above-mentioned piezo-electric crystal electric-controlled hydraulic is utilized
Quick VVT and VVL devices, and including one of scenario described below：
First, when that need not change valve timing and lift, Engine ECU control stop valve is opened, while controlling piezoelectricity
Crystal heap two ends do not power, and piezo-electric crystal does not extend, and pilot valve blocks high-pressure oil passage passage, low pressure under the action of the spring
Oil circuit is turned on, and low pressure oil enters in the oil circuit of SERVO CONTROL valve chamber both sides, and connection bypass C, low pressure oil enters baffle plate side
First chamber, under the second chamber mesohigh oil effect of baffle plate other side, baffle plate will not move right, and second baffle will not
Mobile, valve stroke will not change；Meanwhile, the camshaft of exhaust valve side promotes second piston to move by rocking arm, and compression is described
Hydraulic oil in hydraulic cylinder and hydraulic cavities, promotes valve lifter movement, realizes the valve timing of engine under conventional sense, i.e., often
Scale formula；
2nd, change in engine load, it is necessary to when changing valve stroke, on the basis of said circumstances one, Engine ECU
Stop valve is controlled to close, and to piezo-electric crystal heap two ends on-load voltage, piezo-electric crystal elongation, by displacement amplifier and enlarged cavity
Room, promotes pilot valve to move forward, blocks low pressure oil way passage, high-pressure oil passage channel conductive, hydraulic oil by first piston
Into in the oil circuit of SERVO CONTROL valve chamber both sides, connection bypass C, hydraulic oil enters the first chamber of baffle plate side, first
Under the collective effect of chamber mesohigh oil and baffle plate return spring, baffle plate movement is promoted, so as to promote valve lifter to move, is changed
Valve stroke；Meanwhile, Engine ECU controls electronic control pressure reducing valve according to the working order of engine in different cycle of engine
Different opening, change the oil pressure for entering amplifying chamber mesohigh oil, and then change the pressure differential of baffle plate both sides, promote valve to endure
The consecutive variations of bar displacement, realize the consecutive variations i.e. VVL patterns of valve stroke；
3rd, within the cycle of a valve opening, it is necessary to when changing valve timing, on the basis of situation, Engine ECU
Pressure-reducing valve can be controlled, constantly changes the oil pressure size of the hydraulic oil entered in amplifying chamber, changes the pressure differential of baffle plate both sides,
So as to the time for changing valve opening and closing, so as to realize that valve opening is repeatedly in a cycle, changes valve timing, i.e.,
VVL and VVT patterns.
To sum up, the present invention uses piezo-electric crystal controlling organization as the core of valve variable technique, passes through high-low pressure oil circuit
Effect connection hydraulic cavities, while hydraulic cavities are connected with a valve piston, omission inlet valve side camshaft utilizes exhaust valve side
Camshaft promote piston, and then drive inlet valve by hydraulic cavities, realize the control of accurate valve, Engine ECU is according to work
The different control electronic control pressure reducing valve openings of condition, adjust the pressure size of hydraulic oil, while the deformation of piezo-electric crystal is adjusted, so that real
Existing VVT, VVL.By the above-mentioned means, the present invention can be ingenious by continuous variable valve timing and continuously variable valve lift technology
Fusion, while the fast response characteristic and the Flexible Control of electronic control technology of piezo-electric crystal, preferably can transport engine
Row state matches with operating condition, improves the economy and stability of engine work.
Compared with prior art, the beneficial effects of the invention are as follows：
The camshaft of inlet valve side is eliminated, traditional valve Mechanical Driven form has been broken away from, has utilized exhaust valve side camshaft
Realize changeable air valve with reference to electron controls technology joint driving valve motion, thus friction between reducing mechanical system and
Inertia, suitable for valve in internal combustion engine single cycle according to operating mode transient changing, it is adaptable to the valve operation of the engine such as HCCI, GDI
It is required that；Initiative combination piezo-electric crystal and hydraulic technique realize the soft control to valve timing and valve stroke；Hydraulic pressure
Cavity space is closed, and hydraulic oil is not required to extra supplement, reduces the waste of hydraulic oil, reduces use cost；Both tradition can be realized
Engine valve movement pattern, can also realize VVT, VVL, at the same can also merge VVT/VVL technology synergies work, VVT and
VVL is used in combination, and complements each other, and enables the engine to adapt to various working, engine operating range has been widened significantly；Piezo crystals
Body control mechanism combination high-low pressure oil circuit mechanism realizes that VVT, VVL form reduce the difficulty of electronic control technology, piezo-electric crystal
Fast response characteristic can not only reduce the valve variable response time, and system only needs to the operating condition according to engine
The aperture of the voltage and pressure-reducing valve that change piezo-electric crystal two ends is that the achievable electrodeless adjustable and valve timing to valve stroke can
Adjust.
Brief description of the drawings
Fig. 1 is the quick VVT and VVL apparatus structure schematic diagrams of a kind of piezo-electric crystal electric-controlled hydraulic of the invention；
Fig. 2 is piezo-electric crystal controlling organization schematic diagram in the present invention；
Fig. 3 (a) is the overall structure diagram of high-low pressure oil circuit mechanism in the present invention；
Fig. 3 (b) is the in-house oil circuit schematic diagram of high-low pressure oil circuit in the present invention；
Fig. 4 (a) is hydraulic mechanism hydraulic cavities partial schematic diagram in the present invention；
Fig. 4 (b) is hydraulic mechanism Rocker arm section schematic diagram in the present invention.
In figure：1- piezo-electric crystal heaps, 2- displacement amplifiers, 3- amplifying chambers, 4- first pistons, 5- return chambers, 61- first
Chamber, 62- second chambers, 7- baffle plates, 8- second baffles, 9- hydraulic cavities, 10- first baffles, 11- pilot valves, 12,13-
Return spring, 14- pressure-reducing valves, 15- high pressure oil rails, 16- second pistons, 17- rocking arms, 18- camshafts, 19- displacement amplifier chambers
Room, 20- SERVO CONTROL valve chambers, 21- circle push pedals, 22- stop valves, 23- hydraulic cylinders.
Embodiment
Technical solution of the present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings, described is specific
Only the present invention is explained for embodiment, is not intended to limit the invention.
As shown in figure 1, the quick VVT and VVL devices of a kind of piezo-electric crystal electric-controlled hydraulic of the invention, including piezo-electric crystal control
Mechanism, inlet valve mechanism, hydraulic mechanism, high-low pressure oil circuit mechanism and Engine ECU；The piezo-electric crystal controlling organization and institute
State the both sides that hydraulic mechanism is separately positioned in a cylindrical shell；The middle part of the cylindrical shell is provided with four oil circuit vias.
As depicted in figs. 1 and 2, the piezo-electric crystal controlling organization includes piezo-electric crystal heap 1, the displacement equations set gradually
Device 2, amplifying chamber 3 and first piston 4, the side of the piezo-electric crystal heap 1 and the housing are fixed；The piezo-electric crystal heap 1
Deformation change with the voltage change for being carried in its two ends, the diameter of the displacement amplifier chamber 19 is more than amplifying chamber 3
Diameter, the miniature deformation of the piezo-electric crystal heap 1 passes through amplifier section reflection and arrives the first piston 4 and the SERVO CONTROL
Valve 11, between the piezo-electric crystal heap 1 and the displacement amplifier 2 and the displacement amplifier 2 and the first piston 4 it
Between be respectively provided with return spring；The displacement amplifier chamber 19 and the insertion of amplifying chamber 3.
As shown in figure 1, the inlet valve mechanism includes valve lifter.
As shown in Fig. 1 and Fig. 4 (a), the hydraulic mechanism includes the hydraulic cavities 9 of a closing, and the hydraulic cavities 9 are by setting
In the cylindrical shell and moveable space between first baffle 10 and second baffle 8 is constituted, the first baffle 10
It is connected with the valve lifter.
As shown in Fig. 1 and Fig. 4 (b), camshaft 18 is provided with the side of exhaust valve, the camshaft 18 passes through the band of rocking arm 17
A dynamic second piston 16, the rocking arm 17 uses dies, increases the intensity of rocking arm, and rocking arm connecting pin uses solid circle
Pin, the second piston 16 drives a circular push pedal 21 being arranged in a hydraulic cylinder 23, the circular push pedal 21 have with
The identical diameter of hydraulic cylinder 23, the hydraulic cylinder 23 and the insertion of hydraulic cavities 9, the hydraulic cylinder 23 and hydraulic cavities 9 are empty
Between close, hydraulic oil given volume is not required to additionally supplement The hydraulic oil, reduction waste.
As shown in Fig. 1 and Fig. 3 (a) and Fig. 3 (b), the high-low pressure oil circuit mechanism includes high-pressure oil passage passage and low pressure oil
Paths and the pilot valve 11 and center control unit being arranged in the middle part of cylindrical shell；The pilot valve 11 is provided with back
Pilot valve return spring is provided with position chamber 5, the return chamber 5；The both sides of SERVO CONTROL valve chamber 20 are respectively arranged with
Asphalt channel；The center control unit includes the first chamber 61 and second chamber 62 divided by a baffle plate 7, the first chamber
Baffle plate return spring is provided with 61；One end of the high-pressure oil passage passage and the low pressure oil way passage is respectively connected to high pressure
Oily rail 15, the other end of the high-pressure oil passage passage is penetrated in cylindrical shell by two oil circuit vias and is divided into three branch roads point
The amplifying chamber 3, the return chamber 5 and second chamber 62 are not connected to；Connect the high-pressure oil passage branch of the amplifying chamber 3
Passage A is provided with electronic control pressure reducing valve 14, and the electronic control pressure reducing valve 14 can control to enter the oil pressure of the mesohigh of enlarged cavity 3 oil
Size；The other end of the low pressure oil way passage is penetrated in cylindrical shell by two other oil circuit via and is divided into two branch
Road is respectively connecting to the pilot valve 11 and first chamber 61；Low pressure oil in the low pressure oil passage is the hydraulic oil
Decompression is formed after a series of oil circuits, and the low pressure oil is returned to after fuel tank, is flowed again by the pressurization of high-pressure oil pump
To the high pressure oil rail 15, the recycling of hydraulic oil is realized；Connect on the low pressure oil way branched bottom B of the first chamber 61
Provided with stop valve 22；A bypass C is connected between the valve body and the first chamber 61 of the pilot valve 11；The servo
Control valve 11 is connected with the first piston 4.The piezo-electric crystal heap 1 and the electronic control pressure reducing valve 14, and the stop valve
22 couple with Engine ECU.
Can using the quick valve of the quick VVT and VVL devices piezo-electric crystal electric-controlled hydraulic of piezo-electric crystal electric-controlled hydraulic of the present invention
Become timing and valve variable lift device, and including one of scenario described below：
First, when that need not change valve timing and lift, Engine ECU control stop valve 22 is opened, while controlling pressure
The two ends of electric crystal heap 1 do not power, and piezo-electric crystal does not extend, and pilot valve blocks high-pressure oil passage passage under the action of the spring,
Low pressure oil way is turned on, and low pressure oil enters in the oil circuit of the both sides of SERVO CONTROL valve chamber 20, and connection bypass C, low pressure oil enters baffle plate 7
The first chamber 61 of side, under the mesohigh of the second chamber 62 oil effect of the other side of baffle plate 7, baffle plate 7 will not move right,
Second baffle 8 will not be moved, and valve stroke will not change；Meanwhile, the camshaft 18 of exhaust valve side promotes second by rocking arm 17
Piston 16 is moved, and compresses the hydraulic oil in the hydraulic cylinder 23 and hydraulic cavities 9, promotes valve lifter movement, and then promote air inlet
Door opening and closing, realizes the open phase and lift of normal inlet valve mechanism, enables the motion state of valve accurately with starting
Machine running status is adapted, and realizes the ventilation of engine under conventional sense, i.e. normal mode；
2nd, change in engine load, it is necessary to when changing valve stroke, on the basis of said circumstances one, Engine ECU
Control stop valve 22 is closed, and to the two ends on-load voltage of piezo-electric crystal heap 1, piezo-electric crystal elongation, by displacement amplifier 2 and is put
Big chamber 3, promotes pilot valve 11 to move forward, blocks low pressure oil way passage, high-pressure oil passage passage is led by first piston 4
Logical, hydraulic oil enters in the oil circuit of the both sides of SERVO CONTROL valve chamber 20, and connection bypass C, hydraulic oil enters the first of the side of baffle plate 7
Chamber 61, under the collective effect of the mesohigh of first chamber 61 oil and baffle plate return spring, promotes baffle plate 7 to move, so as to promote
Valve lifter is moved, and changes valve stroke；Meanwhile, Engine ECU is followed according to the working order of engine in different engines
The different opening of control electronic control pressure reducing valve 14 in ring, changes the oil pressure for entering the mesohigh of amplifying chamber 3 oil, and then change baffle plate 7
The pressure differential of both sides, promotes the consecutive variations of valve lifter displacement, realizes the consecutive variations of valve stroke, i.e. VVL patterns；
3rd, within the cycle of a valve opening, it is necessary to when changing valve timing, on the basis of situation 2, engine
ECU can control pressure-reducing valve 14, constantly change the oil pressure size of the hydraulic oil entered in amplifying chamber 3, change the both sides of baffle plate 7
Pressure differential, so as to change valve opening and the time closed, so as to realize that valve opening is repeatedly in a cycle, changes valve
Regularly, realize that VVT, VVL's is electrodeless adjustable with reference to piezo-electric crystal, i.e. VVL and VVT patterns.
Although above in conjunction with accompanying drawing, invention has been described, and the invention is not limited in above-mentioned specific implementation
Mode, above-mentioned embodiment is only schematical, rather than restricted, and one of ordinary skill in the art is at this
Under the enlightenment of invention, without deviating from the spirit of the invention, many variations can also be made, these belong to the present invention's
Within protection.
Claims (2)
1. a kind of quick VVT and VVL devices of piezo-electric crystal electric-controlled hydraulic, it is characterised in that：
Including piezo-electric crystal controlling organization, inlet valve mechanism, hydraulic mechanism, high-low pressure oil circuit mechanism and Engine ECU；It is described
Piezo-electric crystal controlling organization and the hydraulic mechanism are separately positioned on the both sides in a cylindrical shell；The middle part of the cylindrical shell
Provided with four oil circuit vias；
The piezo-electric crystal controlling organization includes piezo-electric crystal heap (1), displacement amplifier (2), the amplifying chamber (3) set gradually
With first piston (4), the piezo-electric crystal heap (1) and the side of the housing are fixed；The diameter of displacement amplifier chamber (19)
More than the diameter of amplifying chamber (3), between the piezo-electric crystal heap (1) and the displacement amplifier (2) and the displacement is put
Greatly return spring is respectively provided between device (2) and the first piston (4)；The displacement amplifier chamber (19) with it is described
Amplifying chamber (3) insertion；
The inlet valve mechanism includes valve lifter；
The hydraulic mechanism include one closing hydraulic cavities (9), the hydraulic cavities (9) by being arranged in the cylindrical shell,
And moveable space between first baffle (10) and second baffle (8) is constituted, the first baffle (10) and the valve
Tappet is connected；
Camshaft (18) is provided with the side of exhaust valve, the camshaft (18) drives a second piston by rocking arm (17)
(16), the rocking arm 17 uses dies, increases the intensity of rocking arm, rocking arm connecting pin uses solid circle pin, described
Second piston (16) drives a circular push pedal (21) being arranged in a hydraulic cylinder (23), and the circular push pedal (21) has and institute
State hydraulic cylinder (23) identical diameter, the hydraulic cylinder (23) and the hydraulic cavities (9) insertion；
The high-low pressure oil circuit mechanism includes high-pressure oil passage passage and low pressure oil way passage and be arranged in the middle part of cylindrical shell one
Pilot valve (11) and center control unit；The pilot valve (11) is provided with return chamber (5), the return chamber (5) and set
There is pilot valve return spring；The center control unit includes first chamber (61) and the second chamber divided by a baffle plate (7)
Baffle plate return spring is provided with room (62), the first chamber (61)；The high-pressure oil passage passage and the low pressure oil way passage
One end be respectively connected to high pressure oil rail (15), the other end of the high-pressure oil passage passage penetrates circle by two oil circuit vias
In post housing and it is divided into three branch roads and is respectively connecting to the amplifying chamber (3), the return chamber (5) and second chamber (62)；
The high-pressure oil passage branched bottom A for connecting the amplifying chamber (3) is provided with electronic control pressure reducing valve (14)；The low pressure oil way passage
The other end, which is penetrated in cylindrical shell by two other oil circuit via and is divided into two branch roads, is respectively connecting to the SERVO CONTROL
Valve (11) and first chamber (61)；The low pressure oil way branched bottom B for connecting the first chamber (61) is provided with stop valve (22)；
A bypass C is connected between the valve body and the first chamber (61) of the pilot valve (11)；
The pilot valve (11) is connected with the first piston (4)；
The piezo-electric crystal heap (1) and the electronic control pressure reducing valve (14), and the stop valve (22) join with Engine ECU
Connect.
2. a kind of quick VVT and VVL control methods of piezo-electric crystal electric-controlled hydraulic, it is characterised in that：Using as claimed in claim 1
The quick VVT and VVL devices of piezo-electric crystal electric-controlled hydraulic, and including one of scenario described below：
First, when that need not change valve timing and lift, Engine ECU control stop valve (22) is opened, while controlling piezoelectricity
Crystal heap (1) two ends do not power, and piezo-electric crystal does not extend, and pilot valve blocks high-pressure oil passage passage under the action of the spring,
Low pressure oil way is turned on, and low pressure oil enters in the oil circuit of SERVO CONTROL valve chamber (20) both sides, and connection bypass C, low pressure oil enters gear
The first chamber (61) of plate (7) side, under second chamber (62) mesohigh oil effect of baffle plate (7) other side, baffle plate (7)
It will not move right, second baffle (8) will not be moved, and valve stroke will not change；Meanwhile, the camshaft (18) of exhaust valve side leads to
Crossing rocking arm (17) promotes second piston (16) mobile, compresses the hydraulic oil in the hydraulic cylinder (23) and hydraulic cavities (9), promotes gas
Stile bar is moved, and realizes the valve timing of engine under conventional sense, i.e. normal mode；
2nd, change in engine load, it is necessary to which when changing valve stroke, on the basis of said circumstances one, Engine ECU is controlled
Stop valve (22) is closed, and to piezo-electric crystal heap (1) two ends on-load voltage, piezo-electric crystal elongation, by displacement amplifier (2) and
Amplifying chamber (3), promotes pilot valve (11) to move forward, blocks low pressure oil way passage, high-pressure oil passage by first piston (4)
Channel conductive, hydraulic oil enters in the oil circuit of SERVO CONTROL valve chamber (20) both sides, and connection bypass C, hydraulic oil enters baffle plate (7)
The first chamber (61) of side, under the collective effect of first chamber (61) mesohigh oil and baffle plate return spring, promotes baffle plate
(7) it is mobile, so as to promote valve lifter to move, change valve stroke；Meanwhile, Engine ECU is according to the working order of engine
The different opening of electronic control pressure reducing valve (14) is controlled in different cycle of engine, changes and enters amplifying chamber (3) mesohigh oil
Oil pressure, and then change baffle plate (7) both sides pressure differential, promote valve lifter displacement consecutive variations, realize valve liter
The consecutive variations of journey, i.e. VVL patterns；
3rd, it is necessary to which when changing valve timing, on the basis of situation two, Engine ECU can within the cycle of a valve opening
To control pressure-reducing valve (14), constantly change the oil pressure size of the hydraulic oil entered in amplifying chamber (3), change baffle plate (7) both sides
Pressure differential, so as to change valve opening and the time closed, so as to realize that in a cycle valve opening repeatedly, changes gas
Door timing, i.e. VVL and VVT patterns.
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| CN107288699B (en) * | 2016-04-11 | 2023-08-29 | 浙江师范大学 | Piezoelectrically driven camshaft-free valve driving mechanism |
| CN105804827A (en) * | 2016-05-04 | 2016-07-27 | 哈尔滨工程大学 | Piezoelectrically-controlled pressure-intensified valve system |
| CN106246276A (en) * | 2016-08-29 | 2016-12-21 | 新奥（中国）燃气投资有限公司 | The automatic adjusting mechanism of a kind of valve clearance and Automatic adjustment method |
| CN109404141B (en) * | 2018-11-09 | 2021-05-18 | 潍柴动力股份有限公司 | Variable valve control device and method |
| CN111060319A (en) * | 2019-12-20 | 2020-04-24 | 大连理工大学 | Device and method for applying gas force to engine motion mechanism |
| CN110985157B (en) * | 2019-12-25 | 2021-05-18 | 潍柴动力股份有限公司 | Exhaust brake system, control method thereof and vehicle |
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|---|---|---|---|---|
| JP2645482B2 (en) * | 1987-09-09 | 1997-08-25 | 株式会社日本自動車部品総合研究所 | Hydraulic drive valve device for internal combustion engine |
| DE102012022295A1 (en) * | 2012-11-14 | 2014-05-28 | Rüdiger Ufermann | Piezo-hydraulic actuator for controlling gas shuttle valve by combustion engines, has print medium in pressure chamber to exert force on piston by principle of hydraulic transformation, so that valve disk is displaced over valve stem |
| CN103953415B (en) * | 2014-04-08 | 2016-07-06 | 天津大学 | Piezoelectric type stepless variable valve mechanism based on inverse piezoelectric effect |
| CN204877575U (en) * | 2015-08-17 | 2015-12-16 | 天津大学 | Quick VVT of automatically controlled hydraulic pressure of piezo electric crystal and VVL device |
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2015
- 2015-08-17 CN CN201510505947.2A patent/CN105156166B/en active Active
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