CN102367751B - VVT (Variable Valve Timing) engine control valve and control method thereof - Google Patents
VVT (Variable Valve Timing) engine control valve and control method thereof Download PDFInfo
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- CN102367751B CN102367751B CN2011102785493A CN201110278549A CN102367751B CN 102367751 B CN102367751 B CN 102367751B CN 2011102785493 A CN2011102785493 A CN 2011102785493A CN 201110278549 A CN201110278549 A CN 201110278549A CN 102367751 B CN102367751 B CN 102367751B
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Abstract
The invention relates to a VVT (Variable Valve Timing) engine control valve and a control method thereof which are used for compensating hysteretic nonlinearity through mechanically opening in the VVT technology. The VVT engine control valve and the control method thereof solve the problems of insufficient air intake and incomplete air exhaust resulted from that the time spent for the camshaft of a traditional engine to rotate by a fixed angle gradually reduces with the increase of a rotating speed. One end of a winding assembly inside a shell is connected with a control component; an oil inlet and a lag chamber oil outlet and an advance chamber oil outlet positioned at two sides of the oil inlet are arranged on an encloser wall of the control component; a sunken compensation area is arranged on the periphery of a valve core; arc-shaped surfaces which correspond to the nonlinearity of magnetic characteristics and can be overlapped into linearity are arranged on two ends of the compensation area; the compensation area arranged on the periphery of the valve core carries out mechanical linear compensation on the control valve; the compensation area is communicated with the lag chamber oil outlet or the advance chamber oil outlet so as to ensure that linear regulation is carried out on a phase angle of a cam of the camshaft.
Description
Technical field
The present invention relates to a kind of control technique of motor car engine, compensate nonlinear VVT engine control valve of magnetic hysteresis and controlling method thereof by the mechanical type opening in especially a kind of VVT technology.
Background technique
The orthodox car petrol engine is to drive camshaft by bent axle through sprocket wheel to rotate, and cam promotes valve stem, controls valve-closing and unlatching according to the order of sequence, realizes air inlet, compression, burning and exhaust, the whole service process all according to cam face given angle running.The traditional engine breathing time that opens and closes is all fixed, but is difficult to this changeless valve timing with respect to the need of work of motor when the different rotating speeds operating mode.Along with engine speed improves, turn over the used time of tilt fixing to diminish gradually, cause power to descend.
Rotating speed during engine operation is very high, and forming such as one of four stroke engine work only needs some thousandths of second, and the so very brief time tends to cause the engine charge deficiency, and exhaust is unclean, causes power to descend.Therefore just need utilize the air inlet inertia of air-flow, valve will early be opened late pass, to satisfy the air inlet abundance, the requirement that exhaust is clean.
In this case, the moment that an intake valve and exhaust valve are opened simultaneously will inevitably occur, be called " overlapping stage " on the port timing.Overlapping lasting relative time-histories can be weighed with the relative angle of the port timing of piston operation around here.This overlapping angle is all very little usually, can be but quite big to the influence of engine performance.Engine speed is high more, and it is also short more to leave air-breathing and absolute time exhaust in each cylinder one-period for, therefore wants to reach charging efficiency preferably, and at this moment motor needs long as far as possible air-breathing and period of exhaust.When rotating speed was high more, the overlapping angle of requirement was big more.That is to say, if the design of distribution device to high rotating speed operation optimization, motor under high rotational speed, obtains bigger peak power easily.But under slow-speed of revolution operating mode, excessive overlapping angle then can make waste gas too much spew out into intake manifold, gettering quantity can descend on the contrary, air-flow also can be disorderly in the cylinder, this moment, ECU also can be difficult to dutycycle is controlled accurately, thereby caused unstable idle speed, and low speed torque is on the low side.On the contrary, if distribution device only to slow-speed of revolution operation optimization, motor just can't be issued to higher peak power at high rotating speed.So traditional motor all is a compromise proposal, can not under two kinds of distinct operating modes, all reach optimum state.
Such as: Patent Office of the People's Republic of China has announced a CN1263942C patent on July 12nd, 2006, name is called the Electromagnetic Drive valve control device and the Electromagnetic Drive Air Valve Control method of internal-combustion engine.The running state of host CPU opportunity internal-combustion engine judges whether exist single air valve to drive requirement, and exist single air valve to drive requiring when judgement is will judge and open between the device whether have overlapping device.When there is not overlapping period in judgement, just carries out high speed control and control the Electromagnetic Drive air valve.When judging that not existing single air valve to drive requires, maybe when there is overlapping period in judgement, just carries out low speed and control the Electromagnetic Drive air valve.Solenoid valve stroke or access portal all are to be controlled by size of current, utilize to produce make a concerted effort poor direction and size of electromagnetic force and spring and come controlled motion direction and stroke, reach the flow of controlling certain oil pressure.But the magnetic force property itself that coil produces is non-linear, adopts pulse signal control, and its characteristic also is non-linear, does not meet the accurately purpose of linearity control of the whole working area of system requirements.
Summary of the invention
The phase angle that the invention solves the camshaft of traditional motor is a tilt fixing, along with rotating speed improves, turning over the used time of tilt fixing diminishes gradually, cause the unclean defective of air inlet deficiency, exhaust, a kind of VVT engine control valve and controlling method thereof are provided, the camshaft phase angle is compensated or lags behind, prolong air-breathing as far as possible and period of exhaust, satisfy air inlet abundance, the clean requirement of exhaust.
It is non-linear that the present invention has also solved the magnetic force property itself that coil produces in the prior art, do not meet the accurately defective of the purpose of linearity control of the whole working area of system requirements, a kind of VVT engine control valve and controlling method thereof are provided, the mode of magnetic force property by mechanical openings compensated, make whole composite character reach the purpose of linearity control.
The technical solution adopted for the present invention to solve the technical problems is: a kind of VVT engine control valve, comprise shell and the winding assembly that is arranged on enclosure, one end of winding assembly is connected with controlling component, described controlling component comprises case, be arranged on the spool in the case, and the spring of connection spool end and cover end, the case wall is provided with a filler opening and is in the hysteresis chamber oil outlet of filler opening both sides and shifts to an earlier date the chamber oil outlet, the compensating basin of depression is set on the periphery of spool, and the two ends of compensating basin are for non-linear corresponding and can be overlapped into linear arc shaped surface with magnetic force property.The linear change can take place in winding assembly magnetic force when voltage change, nonlinear characteristics appears, thereby cause the oil circuit of control valve to change, can not accurately control the switching of engine valve, controlling component by winding assembly one end, realizing that valve shifts to an earlier date On/Off, hysteresis On/Off and remains unchanged compensates non-linear, thereby makes the control of control valve be in linear condition; The compensating basin of the periphery setting of spool is a sunk structure, spool the control oil mass that provides when connection shifts to an earlier date chamber oil outlet and hysteresis chamber oil outlet respectively is provided changes, arc shaped surface in conjunction with the two ends, compensating basin, make the variation of control oil mass be in nonlinear state, this nonlinear state replenishes mutually with the nonlinear characteristics of magnetic force, finally makes the control of valve be in linear condition; Spring mainly plays reset response to spool.
As preferably, the arc shaped surface at two ends, compensating basin is respectively concave arc surface and convex face, the corresponding hysteresis of concave arc surface chamber oil outlet wherein, the corresponding chamber oil outlet in advance of convex face.Therefore need increase oil mass gradually when valve shifts to an earlier date On/Off, use the convex face and to shift to an earlier date the chamber oil outlet corresponding, magnetic force is compensated at the non-linear of low-speed stage; Need reduce oil mass gradually during valve hysteresis On/Off, therefore use concave arc surface corresponding, magnetic force is compensated at the non-linear of high speed stage with hysteresis chamber oil outlet.
As preferably, the maximum diameter of arc shaped surface is less than the external diameter of spool, and the maximum diameter position of arc shaped surface is provided with square breach, and breach is in the two-end part of two arc shaped surfaces respectively.Record one group of control valve earlier, be controlled at the nonlinear characteristics of not taking its electric current and formation under the compensation situation such as 10; According to the nonlinear characteristics of this group control valve that records, get the mean value of the displacement of each electric current corresponding points, the displacement curve of the mean value that draws then; Then can be compensated the slope α in district according to displacement curve, the degree of depth that is compensated the district simultaneously is arctg α; The length of the breach of wherein corresponding hysteresis chamber oil outlet and wide be L1=L2=2/3L
q, the length of the corresponding breach of chamber oil outlet in advance and wide be L3=L4=2/3L
q, L wherein
qFor shifting to an earlier date total kilometres.
As preferably, hysteresis chamber oil outlet is near winding assembly one end, and the chamber oil outlet is away from winding assembly one end in advance.Both can change, and set according to concrete installation and operating habit.
As preferably, case is an end opening, the other end is semi-enclosed hollow structure, the centre of semiclosed end is provided with circular hole, the axis portion of spool is provided with blind hole, the two ends of blind hole are provided with the oilhole of vertical valve wire mandrel, the opening end of blind hole is provided with described spring towards the semiclosed end of case between the opening end of blind hole and the semiclosed end.During the spring free state, the position that spool mediates is closed in advance, the hysteresis oil outlet, and at this moment, it is motionless that the final controlling element rotor keeps.
As preferably, hysteresis chamber oil outlet on the case and in advance the chamber filler opening be provided with stop part at the encloser inner wall place, the internal diameter of stop part and the external diameter of spool match, the filler opening on the case, hysteresis chamber oil outlet and have only in the oil outlet of chamber two to communicate with the compensating basin in advance at the most.When the ECU signal dutyfactor is above greater than 46%, the OCV valve moves to shifting to an earlier date direction according to the signal dutyfactor spool, open corresponding chamber oil outlet in advance, shift to an earlier date the axially direction rotation in advance of rotor banding moving cam that the chamber is sent to oil pressure, promoted final controlling element to final controlling element, to reach the purpose that air inlet or exhaust shift to an earlier date.Below the ECU signal dutyfactor is worth less than certain, the spool of OCV valve is opened corresponding hysteresis chamber oil outlet to the motion of hysteresis direction, sends to oil pressure to final controlling element hysteresis chamber, promote the final controlling element rotor and drive the camshaft rotation, to reach the purpose of air inlet or exhaust lag to the hysteresis direction.The present invention is a defective of utilizing mechanical openings fine setting compensation OCV valve core non-linear displacement.
As preferably, the winding assembly comprises the armature and the pole shoe that mediate, is nested with yoke externally, armature and pole shoe outside are wound with coil, armature and pole shoe are separated and form main air gap, yoke and armature are separated and form first air gap, yoke and the pole shoe formation interstice that is separated, wherein pole shoe is towards controlling component one side.When automobilism during at idling, low speed, because the vehicle-mounted ECU signal dutyfactor is little, it is little promptly to be added on the OCV valve average voltage level, in addition by static state to factors such as dynamic stiction, its spool is difficult to realize linearity control during startup, so the characteristic initial segment needs mechanical compensation, increase along with the ECU signal dutyfactor, spool is opened the mouth that lags behind earlier, after the speed of a motor vehicle reached certain value of middling speed, spool continued to opening mouthful direction motion in advance, when spool stroke reach open in advance mouthful after, just promote final controlling element rotor banding moving cam axle and rotate, to realize the control in advance of intake and exhaust.
A kind of controlling method of VVT engine control valve, comprise the steps: that (1), motor central unit ECU have different duty square signal corresponding under the various operating modes of motor, simultaneously ECU has the best data of revising phase place of camshaft, with the qualified discriminating at the rotation phase angle of realizing camshaft and the function of system feedback control.
(2), in engine operation, relevant operating mode sensor signal is delivered to ECU, ECU sends to the square signal of corresponding pulsewidth for air inlet, gas exhausting valve according to the working condition signal of sending into.
(3), control valve runs to the relevant position according to signal, the spool sent into, opens chamber oil outlet or hysteresis chamber oil outlet in advance, rotate to respective direction to promote the final controlling element rotor, thereby drive camshaft in advance or the rotation of hysteresis direction.
(4), during the motor raising speed, ECU sends to corresponding pulse width signal for air inlet, gas exhausting valve according to engine speed, at this moment, the chamber oil outlet in advance that control valve is opened corresponding size send oil to final controlling element, driving cam axially in advance direction rotate respective angles.
(5), during drop engine speed, ECU sends to corresponding pulse width signal for air inlet, gas exhausting valve according to engine speed, control valve is opened corresponding hysteresis chamber oil outlet, and oil pressure is delivered to final controlling element hysteresis chamber, rotates respective angles with the driving cam direction that axially lags behind.
(6), when motor is stabilized in a certain rotating speed, ECU sends to corresponding pulse width signal for air inlet, gas exhausting valve, this moment, control valve moved to closed position, so-called closed position is meant that spool operates in advance chamber oil outlet and hysteresis chamber oil outlet all during shutoff, at this moment, camshaft keeps original position, and the phase angle is constant.
The invention has the beneficial effects as follows: by the spool that connects, the compensating basin of spool periphery setting carries out the mechanical type linear compensation to control valve, thereby the compensating basin is communicated with the phase angle of guaranteeing the cam of camshaft with in advance chamber oil outlet or hysteresis chamber oil outlet carries out linearly adjust, realization open in advance intake valve, in advance open exhaust valve, intake valve is opened in hysteresis and the accuracy of the action of exhaust valve is opened in hysteresis.
Description of drawings
Fig. 1 is a kind of structural representation of the present invention;
Fig. 2 is the present invention's A place partial enlarged drawing shown in Figure 1;
Fig. 3 is a kind of compensation control principle of the present invention figure;
Among the figure: 1, shell, 2, yoke, 3, coil, 4, case, 5, hysteresis chamber oil outlet, 6, filler opening, 7, chamber oil outlet in advance, 8, spring, 9, blind hole, 10, spool, 11, pole shoe, 12, armature, 13, hysteresis chamber breach, 14, concave arc surface, 15, the compensating basin, 16, convex face, 17, chamber breach in advance, 18, stop part.
Embodiment
Below by specific embodiment, and in conjunction with the accompanying drawings, technological scheme of the present invention is described in further detail.
Embodiment: a kind of VVT engine control valve (referring to accompanying drawing 1), comprise shell 1 and the winding assembly that is arranged on enclosure, an end of winding assembly is connected with controlling component.
The winding assembly comprises the armature 12 and the pole shoe 11 that mediate, is nested with yoke 2 externally, armature and pole shoe outside are wound with coil 3, armature and pole shoe are separated and form main air gap, yoke and armature are separated and form first air gap, yoke and the pole shoe formation interstice that is separated, wherein pole shoe is towards controlling component one side.
Controlling component (referring to accompanying drawing 2) comprises case 4, is arranged on the interior spool 10 of case, reaches the spring 8 that connects spool end and cover end.Case is an end opening, the other end is semi-enclosed hollow structure.One end of opening and the end interference fit of winding assembly, the end of interference fit is provided with seal ring.The centre of semiclosed end is provided with circular hole, and the axis portion of spool is provided with blind hole 9, and the two ends end of blind hole is provided with the oilhole of vertical valve wire mandrel, and the opening end of blind hole is towards the semiclosed end of case.The inwall of the opening end of blind hole is provided with step, and spring is arranged on the semiclosed end of step and case.
The case wall is provided with a filler opening 6 and is in the hysteresis chamber oil outlet 5 of filler opening both sides and shifts to an earlier date chamber oil outlet 7.Hysteresis chamber oil outlet on the case and in advance the chamber filler opening be provided with stop part 18 at the encloser inner wall place, the internal diameter of stop part and the external diameter of spool match.Compensating basin 15 is set on the periphery of spool, and the two ends of compensating basin are for non-linear corresponding and can be overlapped into linear arc shaped surface with magnetic force property.The maximum diameter of arc shaped surface is less than the external diameter of spool, and the maximum diameter position of arc shaped surface is provided with square breach, and breach is in the two-end part of two arc shaped surfaces respectively.One side of corresponding hysteresis chamber oil outlet is a concave arc surface 14, and a corresponding side of chamber oil outlet in advance is a convex face 16.What be in concave arc surface is hysteresis chamber breach 13, and what be in the convex face is to shift to an earlier date chamber breach 17.Filler opening on the case, hysteresis chamber oil outlet and have only in the oil outlet of chamber two to communicate in advance at the most with the compensating basin.
A kind of controlling method of VVT engine control valve (referring to accompanying drawing 3), comprise the steps: that (1), motor central unit ECU have different duty square signal corresponding under the various operating modes of motor, simultaneously ECU has the best data of revising phase place of camshaft, with the qualified discriminating at the rotation phase angle of realizing camshaft and the function of system feedback control.
(2), in engine operation, relevant operating mode sensor signal is delivered to ECU, ECU sends to the square signal of corresponding pulsewidth for air inlet, gas exhausting valve according to the working condition signal of sending into.
(3), control valve runs to the relevant position according to signal, the spool sent into, opens chamber oil outlet or hysteresis chamber oil outlet in advance, rotate to respective direction to promote the final controlling element rotor, thereby drive camshaft in advance or the rotation of hysteresis direction.
(4), during the motor raising speed, ECU sends to corresponding pulse width signal for air inlet, gas exhausting valve according to engine speed, at this moment, the chamber oil outlet in advance that control valve is opened corresponding size send oil to final controlling element, driving cam axially in advance direction rotate respective angles.
(5), during drop engine speed, ECU sends to corresponding pulse width signal for air inlet, gas exhausting valve according to engine speed, control valve is opened corresponding hysteresis chamber oil outlet, and oil pressure is delivered to final controlling element hysteresis chamber, rotates respective angles with the driving cam direction that axially lags behind.
(6), when motor is stabilized in a certain rotating speed, ECU sends to corresponding pulse width signal for air inlet, gas exhausting valve, this moment, control valve moved to closed position, so-called closed position is meant that spool operates in advance chamber oil outlet and hysteresis chamber oil outlet all during shutoff, at this moment, camshaft keeps original position, and the phase angle is constant.
Above-described embodiment is a kind of preferred version of the present invention, is not the present invention is done any pro forma restriction, also has other variant and remodeling under the prerequisite that does not exceed the technological scheme that claim puts down in writing.
Claims (8)
1. VVT engine control valve, comprise shell (1) and be arranged on the winding assembly of enclosure, one end of winding assembly is connected with controlling component, described controlling component comprises case (4), be arranged on the spool (10) in the case, and the spring (8) of connection spool end and cover end, the case wall is provided with a filler opening (6) and is in the hysteresis chamber oil outlet (5) of filler opening both sides and shifts to an earlier date chamber oil outlet (7), it is characterized in that being provided with on the periphery of spool the compensating basin (15) of depression, the two ends of compensating basin are for non-linear corresponding and can be overlapped into linear arc shaped surface with magnetic force property.
2. VVT engine control valve according to claim 1 is characterized in that the arc shaped surface at two ends, compensating basin is respectively concave arc surface (14) and convex face (16), the corresponding hysteresis of concave arc surface chamber oil outlet wherein, the corresponding chamber oil outlet in advance of convex face.
3. VVT engine control valve according to claim 1 is characterized in that the external diameter of the maximum diameter of arc shaped surface less than spool, and the maximum diameter position of arc shaped surface is provided with square breach, and breach is in the two-end part of two arc shaped surfaces respectively.
4. according to claim 1 or 2 or 3 described VVT engine control valves, the chamber oil outlet that it is characterized in that lagging behind is near winding assembly one end, and the chamber oil outlet is away from winding assembly one end in advance.
5. according to claim 1 or 2 or 3 described VVT engine control valves, it is characterized in that case is an end opening, the other end is semi-enclosed hollow structure, the centre of semiclosed end is provided with circular hole, the axis portion of spool is provided with blind hole (9), the two ends end of blind hole is provided with the oilhole of vertical valve wire mandrel, the opening end of blind hole is provided with described spring towards the semiclosed end of case between the opening end of blind hole and the semiclosed end.
6. according to claim 1 or 2 or 3 described VVT engine control valves, it is characterized in that the hysteresis chamber oil outlet on the case and shift to an earlier date the chamber filler opening being provided with stop part (18) at the encloser inner wall place, the internal diameter of stop part and the external diameter of spool match, the filler opening on the case, hysteresis chamber oil outlet and have only in the oil outlet of chamber two to communicate with the compensating basin in advance at the most.
7. according to claim 1 or 2 or 3 described VVT engine control valves, it is characterized in that the winding assembly comprises the armature (12) and the pole shoe (11) that mediate, is nested with yoke (2) externally, armature and pole shoe outside are wound with coil (3), armature and pole shoe are separated and form main air gap, yoke and armature are separated and form first air gap, yoke and the pole shoe formation interstice that is separated, wherein pole shoe is towards controlling component one side.
8. the controlling method of the arbitrary described VVT engine control valve of claim 1 to 7 is characterized in that comprising the steps:
(1), motor central unit ECU has different duty square signal corresponding under the various operating modes of motor, simultaneously ECU has the best data of revising phase place of camshaft, with the qualified discriminating at the rotation phase angle of realizing camshaft and the function of system feedback control;
(2), in engine operation, relevant operating mode sensor signal is delivered to ECU, ECU sends to the square signal of corresponding pulsewidth for air inlet, gas exhausting valve according to the working condition signal of sending into;
(3), control valve runs to the relevant position according to signal, the spool sent into, opens chamber oil outlet or hysteresis chamber oil outlet in advance, rotate to respective direction to promote the final controlling element rotor, thereby drive camshaft in advance or the rotation of hysteresis direction;
(4), during the motor raising speed, ECU sends to corresponding pulse width signal for air inlet, gas exhausting valve according to engine speed, at this moment, the chamber oil outlet in advance that control valve is opened corresponding size send oil to final controlling element, driving cam axially in advance direction rotate respective angles;
(5), during drop engine speed, ECU sends to corresponding pulse width signal for air inlet, gas exhausting valve according to engine speed, control valve is opened corresponding hysteresis chamber oil outlet, and oil pressure is delivered to final controlling element hysteresis chamber, rotates respective angles with the driving cam direction that axially lags behind;
(6), when motor is stabilized in a certain rotating speed, ECU sends to corresponding pulse width signal for air inlet, gas exhausting valve, this moment, control valve moved to closed position, so-called closed position is meant that spool operates in advance chamber oil outlet and hysteresis chamber oil outlet all during shutoff, at this moment, camshaft keeps original position, and the phase angle is constant.
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| CN2011102785493A CN102367751B (en) | 2011-09-20 | 2011-09-20 | VVT (Variable Valve Timing) engine control valve and control method thereof |
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| CN2011102785493A CN102367751B (en) | 2011-09-20 | 2011-09-20 | VVT (Variable Valve Timing) engine control valve and control method thereof |
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| CN102367751B true CN102367751B (en) | 2013-07-24 |
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| DE102014224321A1 (en) * | 2014-11-27 | 2016-06-02 | Robert Bosch Gmbh | Method for determining the armature stroke of a magnetic actuator |
| CN111828118A (en) * | 2020-06-28 | 2020-10-27 | 句容嘉晟汽车配件有限公司 | Porous valve core of VVT engine control valve |
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| DE19817319C2 (en) * | 1998-04-18 | 2001-12-06 | Daimler Chrysler Ag | Camshaft adjuster for internal combustion engines |
| DE10211467A1 (en) * | 2002-03-15 | 2003-09-25 | Daimler Chrysler Ag | Camshaft adjuster for an internal combustion engine has a pressing proportional electromagnet |
| CN102042050A (en) * | 2010-12-01 | 2011-05-04 | 成都恒高机械电子有限公司 | Continuous variable air valve timing fuel oil control valve |
| CN202280492U (en) * | 2011-09-20 | 2012-06-20 | 宁波诺依克电子有限公司 | Variable valve timing (VVT) engine controlling valve |
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Address after: 315800 Zhejiang city of Ningbo province Beilun xinqie Port Road No. 600 Building 1, No. 1 Patentee after: Ningbo Pacific Electric Control System Co., Ltd. Address before: 315800, 600 Zhejiang, Ningbo, Ningbo Patentee before: Ningbo Royelek Electronics Co., Ltd. |