CN102392914B - Control method and control system of electro-hydraulic proportional directional valve - Google Patents
Control method and control system of electro-hydraulic proportional directional valve Download PDFInfo
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Abstract
The invention discloses a control method of an electro-hydraulic proportional directional valve. The method comprises the steps of switching a control handle from an initial state to a maximal deflection angle of the handle, wherein after the defection angle of the control handle is out of the range of handle misoperation prevention (S401), a preset current value (I0) of control current is transmitted to the electro-hydraulic proportional directional control valve (100), and the control current is kept for a preset current retention time (t3); and after the preset current retention time (t3) is over, the control current drops down to a buffer current value (I2). In addition, the invention also provides a control system of the electro-hydraulic proportional direction valve. According to the invention, by using the control method and the control system of the electro-hydraulic proportional direction valve, the response lag time of the electro-hydraulic proportional direction valve can be reduced to an Larger extent without affecting the original performance of the electro-hydraulic proportional direction valve, and accordingly the complete machine performance of the electro-hydraulic proportional direction valve can be enhanced, and thus the quickness and flexibility of engineering mechanical equipment can be improved as a whole.
Description
Technical field
The present invention relates to a kind of electromagnetic proportional valve controlling method, particularly, relate to a kind of electrohydraulic proportional directional valve controlling method, this controlling method mainly is applicable to the engineering mechanical device electrohydraulic proportional directional valve, is particularly useful for the crane electrohydraulic proportional directional valve.In addition, the invention still further relates to a kind of control system for electro-hydraulic proportional.
Background technique
Along with the day by day raising of industrial automation level, engineering mechanical device requires the pressure of hydraulic oil and flow etc. to control continuously or pro rata such as the hydraulic system of crane.In this case, electro-hydraulic proportional valve obtains increasingly extensive application.Although the type of electro-hydraulic proportional valve is varied, but its structural principle basic simlarity, generally formed by proportion electro-magnet and hydraulic control valve two-part, proportion electro-magnet receives the electrical signal of input, produce continuously or pari passu electromagnetic force, the valve rod of hydraulic control valve is subject to electromagnetic force, controls continuously or pari passu pressure and the flow of hydraulic oil.
Fig. 1 shows a kind of electro-hydraulic proportional valve that present engineering mechanical device (for example crane) generally adopts, and it belongs to the electrohydraulic proportional directional valve in the electro-hydraulic proportional valve.Because the system pressure of engineering mechanical device hydraulic system is generally larger, for flexibility and the portability that strengthens operation, this project machinery this employing of electric-hydraulic proportion valve base pilot control, i.e. leading type electrohydraulic proportional directional valve.As shown in Figure 1, this project machinery is controlled by guide's solenoid-operated proportional reduction valve 1 with the position of the main valve stem 2 of electro-hydraulic proportional valve, drives main valve stem 2 by control guide solenoid-operated proportional reduction valve 1, thereby realizes commutation.
But with regard to the control of electro-hydraulic proportional valve, it is compared with the hydraulic control Proportional valve with regard to above-mentioned engineering mechanical device, and the time-delay phenomenon is comparatively serious, and the operant response time-delay is long, not only can not satisfy client's operation requirements, and affect working efficiency and the performance thereof of complete machine.
Specifically can be referring to shown in Figure 2, therefrom can find out, when the described electrohydraulic proportional directional valve of operation, operating control handle at first, generally all can there be handle anti-misoperation angle value (for example 3 ° shown in Fig. 2) in Joystick, when only having the handle drift angle to surpass this handle anti-misoperation angle value when namely pulling handle, the controller that is connected in Joystick is just understood output current signal, thereby control guide solenoid-operated proportional reduction valve 1 output guide hydraulic control oil, this pilot control oil promotes main valve stem 2 and moves, at a mobile segment distance (for example 3mm shown in Fig. 2), corresponding actuator port is communicated with, thereby beginning output services hydraulic oil, the actuator of engineering mechanical device starts working.In the process of this electrohydraulic proportional directional valve operation, from beginning to pull Joystick, to electrohydraulic proportional directional valve output services hydraulic oil, be t the retard time of electrohydraulic proportional directional valve operant response, as shown in Figure 2.
For addressing this problem, prior art mainly adopts following three kinds of solutions: first, increase the rated flow of guide's solenoid-operated proportional reduction valve 1, namely accelerate driving to main valve stem by the output flow that increases guide's solenoid-operated proportional reduction valve 1, thereby shorten the deferred reaction time of above-mentioned electrohydraulic proportional directional valve; The secondth, reduce the diameter of main valve stem 2, referring to shown in Figure 1, like this in the situation that in the unit time identical supply volume fluid can increase the stroke of main valve stem in the unit time, also can alleviate simultaneously the weight of main valve stem 2, so that main valve stem has faster travelling speed under identical driving force situation, shorten thus the deferred reaction time of electrohydraulic proportional directional valve; The 3rd is to improve electric current to advance the speed, referring to shown in Figure 2, this can be by dwindling handle anti-misoperation scope or the slope that directly increases current curve is realized, this mode mainly be by so that the control electric current of guide's solenoid-operated proportional reduction valve 1 increase fast, thereby increase its delivery pressure, thereby increase the driving force to main valve stem 2, this can shorten electrohydraulic proportional directional valve operation response time, for example controlling method of the disclosed Proportional valve of application for a patent for invention CN101349358A of SANY Heavy Industry Co., Ltd to a certain extent.
But above-mentioned three kinds of solutions respectively have its narrow limitation, and are specific as follows:
In conjunction with above-mentioned existing issue-resolution, if reduce the main valve flow that the diameter of main valve stem 2 certainly will will reduce electrohydraulic proportional directional valve to a certain extent, this kind scheme obviously can not satisfy actual requirement, especially on engineering mechanical device; If increase the rated flow of guide's solenoid-operated proportional reduction valve, although it can play certain effect, but limited to the response delay effect that reduces electrohydraulic proportional directional valve, owing to need to existing electrohydraulic proportional directional valve significantly be transformed, this obviously can increase larger processing cost simultaneously; If dwindle handle anti-misoperation scope, although can play certain effect, regulation range is very limited, and handle anti-misoperation scope is too small, easily produces the misoperation of handle.In addition, if directly increase the slope of control current curve, although this mode can solve electrohydraulic proportional directional valve operation response latency issue to a great extent, but the slope that directly increases current curve will produce great impact when the main valve work of electrohydraulic proportional directional valve, this impact does not allow to occur in the operation of engineering mechanical device.This shows, above-mentioned solution of the prior art all can not solve the long problem of response delay effectively.
Summary of the invention
Technical problem to be solved by this invention is that a kind of electrohydraulic proportional directional valve controlling method will be provided, this electrohydraulic proportional directional valve controlling method can on the basis that does not affect the existing performance of electrohydraulic proportional directional valve, shorten its operation response time largely.
On this basis, the further technical problem to be solved of the present invention is that a kind of control system for electro-hydraulic proportional will be provided, this control system for electro-hydraulic proportional can shorten the operation response time of electrohydraulic proportional directional valve significantly, thereby effectively improves the overall performance of electrohydraulic proportional directional valve.
In order to solve the problems of the technologies described above, the invention provides a kind of electrohydraulic proportional directional valve controlling method, this electrohydraulic proportional directional valve controlling method comprises pulls handle drift angle maximum value with Joystick from original state, wherein, after the drift angle of described Joystick surpasses handle anti-misoperation scope, carry the control electric current of predetermined current value to the electric-hydraulic proportion position control valve, and so that should keep the predetermined current retention time by the control electric current, move the preliminary displacement of valve rod with the main valve stem that drives described electrohydraulic proportional directional valve, wherein said predetermined current value is greater than valve rod conducting minimum drive current value, and the first step displacement of described valve rod is less than valve rod conducting least displacement; Passing through described predetermined current after the retention time, so that described control electric current drops to the buffer current value less than described valve rod conducting minimum drive current value, and then so that this control electric current is set rate of rise is increased to described electrohydraulic proportional directional valve from this buffer current value maximum rated control current value according to first.
Preferably, described predetermined current value equals described maximum rated control current value.
Particularly, the little 0.2-2mm of the described valve rod conducting of the preliminary Displacement Ratio of described valve rod least displacement.
Preferably, after the drift angle of described Joystick surpasses described handle anti-misoperation scope, so that the control electric current of carrying to described electric-hydraulic proportion position control valve rises to described predetermined current value with the second setting rate of rise.
Preferably, passing through described predetermined current after the retention time, so that described control electric current drops to described buffer current value with predetermined lowering speed from described predetermined current value.
Specifically selectively, carry described control electric current by controller to described electrohydraulic proportional directional valve.
Particularly, described electrohydraulic proportional directional valve has the guide's solenoid-operated proportional reduction valve for pilot control, and described control electric current is transported to this guide's solenoid-operated proportional reduction valve.
For realizing above-mentioned controlling method, the present invention also provides a kind of control system for electro-hydraulic proportional, this electric-hydraulic proportion heading control loop comprises Joystick, electrohydraulic proportional directional valve and controller, wherein, described Joystick and electrohydraulic proportional directional valve are electrically connected on respectively described controller, and this controling appliance is useful on the signal receiving module that receives described Joystick declination signal and is used for control module to described electrohydraulic proportional directional valve pipage control electric current.
Particularly, when surpassing handle anti-misoperation angle value in the drift angle of described Joystick, described controller carries the control electric current of a predetermined current value to described electrohydraulic proportional directional valve, and so that this control electric current keeps the predetermined current retention time, described predetermined current value is greater than valve rod conducting minimum drive current value.
Preferably, described predetermined current value equals the maximum rated control current value of described electrohydraulic proportional directional valve.
Preferably, described controller is set rate of rise to the control electric current of described electrohydraulic proportional directional valve conveying with second and is risen to described predetermined current value.
Particularly, described control electric current moves just step displacement of a valve rod at described predetermined current drives described electrohydraulic proportional directional valve in the retention time main valve stem, and the first step displacement of this valve rod is less than valve rod conducting least displacement.
Preferably, the little 0.2-2mm of the described valve rod conducting of the preliminary Displacement Ratio of described valve rod least displacement.
Preferably, described controller through described predetermined current after the retention time so that this control electric current drops to buffer current value less than described valve rod conducting minimum drive current value from described predetermined current value, and so that this buffer current value is increased to the maximum rated control current value of described electrohydraulic proportional directional valve with the first setting rate of rise.
Preferably, described controller is so that described control electric current drops to described buffer current value with predetermined lowering speed from described predetermined current value.
Particularly, described electrohydraulic proportional directional valve is provided with the guide's solenoid electric valve for pilot control, and this guide's solenoid electric valve is electrically connected on described controller.
Preferably, described guide's solenoid electric valve is guide's solenoid-operated proportional reduction valve.
Preferably, described controller is programmable controller.
Pass through technique scheme, electrohydraulic proportional directional valve controlling method of the present invention and control system thereof can be on the bases that does not affect the original performance of electrohydraulic proportional directional valve, shorten largely the response time of electrohydraulic proportional directional valve operation, and then the overall performance of raising electrohydraulic proportional directional valve, thereby agility and flexibility from the work of whole betterment works machinery have improved working efficiency.In addition, electrohydraulic proportional directional valve controlling method of the present invention and control system thereof only need the control program of controller is changed accordingly, can not increase extra manufacture cost, it can shorten the operation response time of engineering machinery liquid proportional directional control valve effectively, its successful, it is convenient to realize.
Other features and advantages of the present invention will partly be described in detail in embodiment subsequently.
Description of drawings
Following accompanying drawing is used to provide a further understanding of the present invention, and consists of the part of specification, and itself and following embodiment one are used from explanation the present invention, but protection scope of the present invention is not limited to following the drawings and the specific embodiments.In the accompanying drawings:
Fig. 1 is the structural representation of electrohydraulic proportional directional valve;
Fig. 2 is that electrohydraulic proportional directional valve shown in Figure 1 is controlled parameter and the configuration relation figure between the response time in the prior art;
Fig. 3 is the responding process block diagram in the electrohydraulic proportional directional valve control procedure;
Fig. 4 is the main valve stem of electrohydraulic proportional directional valve shown in Figure 1 and the hydraulic fluid port schematic diagram between the valve body;
Fig. 5 is the control parameter of electrohydraulic proportional directional valve in controlling method of the present invention and the configuration relation figure of response time; And
Fig. 6 is the control parameter of electrohydraulic proportional directional valve in the further preferred controlling method of the present invention and the configuration relation figure of corresponding time.
Fig. 7 is the linkage structure schematic diagram of control system for electro-hydraulic proportional of the present invention.
Reference character and comment token explanation:
1 guide's solenoid-operated proportional reduction valve; 2 main valve stems;
3 valve bodies; 301 filler openings;
302 actuator ports; 303 return openings;
4 Joysticks; 5 controllers;
100 electrohydraulic proportional directional valves; Response delay time in the existing method of t;
The total delay time of t1; T2 lever operated retard time;
The t3 predetermined current retention time; The t4 oil duct is connected and is set aside some time;
α-max handle drift angle maximum value; α 1 handle anti-misoperation angle value;
The maximum rated control current value of I-max; I0 predetermined current value;
I1 valve rod conducting minimum drive current value;
I2 buffer current value; The maximum displacement of L-max main valve stem;
L1 valve rod conducting least displacement;
The L2 valve rod is step displacement just;
P-max actuator port peak rate of flow; S401 handle anti-misoperation scope;
The invalid scope of S402 electric current; S403 valve rod cut-off scope;
B401 handle drift angle coordinate axes; B402 control electric current coordinate axes;
B403 valve rod travel coordinate axes; B404 actuator port flow coordinate axes;
X401 handle drift angle line style; X402 control electric current line style;
X403 valve rod travel line style; X404 actuator port flow line style.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated, should be understood that, embodiment described herein only is used for description and interpretation the present invention, and protection scope of the present invention is not limited to following embodiment.
Referring to Fig. 1 and Fig. 3, wherein Fig. 1 shows the structural representation of the electrohydraulic proportional directional valve that extensively adopts on the engineering mechanical device, and Fig. 3 shows the responding process block diagram in this electrohydraulic proportional directional valve control procedure.The main flow process of electrohydraulic proportional directional valve work is pulled Joystick for the operator, Joystick changes into electric signal transmission to controller with the signal of movement range, controller is processed electrical signal, to control current delivery to electrohydraulic proportional directional valve 100 according to electrical signal again, for example on guide's solenoid-operated proportional reduction valve 1 of electrohydraulic proportional directional valve 100, guide's solenoid-operated proportional reduction valve 1 is exported guide oil by the control of control electric current, thereby promoting main valve stem 2 moves, main valve stem 2 slides to control the break-make of corresponding hydraulic fluid port, and hydraulic oil drives engineering mechanical device under the control of electrohydraulic proportional directional valve actuator carries out exercises.It should be noted that at this, electrohydraulic proportional directional valve shown in Figure 1 belongs to the leading type electrohydraulic proportional directional valve, this electrohydraulic proportional directional valve comprises guide's solenoid-operated proportional reduction valve, but electrohydraulic proportional directional valve of the present invention is not limited to the leading type electrohydraulic proportional directional valve, and it also is suitable for for direct action type electrohydraulic proportional directional control valve etc.In this case; controller can be directly to the proportion electro-magnet pipage control electric current of electrohydraulic proportional directional valve, its control principle is similarly, no matter the therefore type of electrohydraulic proportional directional valve; as long as it adopts the technical conceive of controlling method of the present invention, just should belong to protection scope of the present invention.Below the electrohydraulic proportional directional valve that extensively adopts take engineering mechanical device shown in Figure 1 set forth controlling method of the present invention as example.
Analysis by above as can be known, in the operating process of electrohydraulic proportional directional valve, response delay time t (seeing Fig. 2) in the existing controlling method of electrohydraulic proportional directional valve is mainly by controller current-responsive time-delay (main manifestations is lever operated delay), guide's solenoid-operated proportional reduction valve response time-delay (proportion electro-magnet produces enough electromagnetic forces needs the regular hour), this tetrameric response time-delay stack of main valve stem response time-delay and the time-delay of engineering machinery action response (Fig. 2 does not show the response time-delay of this project machinery action) causes, in this four part, the time-delay of controller current-responsive and these two-part of main valve stem response time-delay are most important two aspects that this phenomenon produces, so, effectively shorten this two-part response delay time and can solve preferably this problem of electrohydraulic proportional directional valve operation response time-delay.
Referring to Fig. 4, the oil sealing distance of main valve stem 2 is valve rod conducting least displacement L1, when main valve stem 2 is moved to the left distance less than valve rod conducting least displacement L1 with respect to valve body 3, be in sealing state between filler opening 301 and the actuator port 302, hydraulic oil can't enter into actuator port 302 by filler opening 301.When main valve stem 2 is moved to the left distance greater than valve rod conducting least displacement L1 with respect to valve body 3, be in on-state between filler opening 301 and the actuator port 302, fluid will enter into actuator port 302 by filler opening 301, thereby actuator port 302 is to actuator's fuel feeding of engineering mechanical device, this is corresponding with Fig. 5, when namely only having the main valve stem stroke to reach valve rod conducting least displacement L1, actuator port 302 just can have flow, i.e. external fuel feeding (referring to the actuator port flow line style X404 among Fig. 5); When main valve stem 2 was oppositely mobile, actuator port 302 was connected with return opening 303, and fluid will enter into return opening 303 by actuator port 302.
Below referring to Fig. 5, need to prove at this, the response of the various piece that electrohydraulic proportional directional valve control of the present invention is related is a very complicated process, Fig. 5 selects topmost response constituent element to show, may have small response lag in two kinds of response convergence process, but since small to the operation response delay of whole process, therefore in chart, all omit.
In Fig. 5, total delay time t1 of electrohydraulic proportional directional valve controlling method of the present invention, namely from the operator handle Joystick begin the action have flow to export the used time to electrohydraulic proportional directional valve.Wherein, B401 is handle drift angle coordinate axes, represents that namely handle pulls the coordinate axes of angle, and α-max is handle drift angle maximum value on this coordinate axes, be that the Joystick operation has certain drift angle scope restriction, α-max is the sail angle value that Joystick is exported effective control signal; B402 is control electric current coordinate axes, the coordinate axes of i.e. expression control size of current, the control electric current is generally exported by controller, I-max is the maximum rated control current value of electrohydraulic proportional directional valve on this coordinate axes, namely when Joystick reaches the sail angle value, the maximum current that can export behind the controller electric current stable output, this is generally corresponding to the maximum rated control current value of electrohydraulic proportional directional valve; B403 is the valve rod travel coordinate axes, namely represents the coordinate axes of main valve stem 2 displacement distance sizes, and L-max is the main valve stem maximum displacement on this coordinate axes, namely after the guide oil pressure reaches maximum value, can promote the maximum mobile position that main valve stem 2 can reach; B404 is actuator port flow coordinate axes, the coordinate axes that namely represents electrohydraulic proportional directional valve actuator port output flow size, P-max is the actuator port peak rate of flow on this coordinate axes, namely when main valve stem 2 is in maximum displacement L-max, the peak rate of flow that the electrohydraulic proportional directional valve actuator port can be exported.These four along slope coordinate axles in Fig. 5 and transverse coordinate axis response time T jointly be reflected in the operating process of solenoid-operated proportional directional control valve each control parameter and relation between the response time.
In addition, in Fig. 5, X401 is handle drift angle line style, i.e. dotted line among Fig. 5, the line style that the Curves of its expression handle drift angle size adopts; X402 is control electric current line style, the line style that the curve of its expression control size of current adopts; X403 is the valve rod travel line style, the line style that the curve of its expression main valve stem 2 displacement sizes adopts; X404 is actuator port flow line style, the line style that the curve of its expression electrohydraulic proportional directional valve actuator port output flow size adopts.Need to prove at this; in Fig. 5; in order to express easily; various curves adopt straight line to describe; but the technical conceive according to controlling method of the present invention; so that the design that output current and other correlation quantitys change with curve form also belongs to the technical conceive scope of this controlling method, therefore also belong to protection scope of the present invention.
In the controlling method of solenoid-operated proportional directional control valve of the present invention, at first the operator need to pull Joystick 4, and Joystick is pulled handle drift angle maximum value α-max by original state, and handle drift angle maximum value α-the max place stops.In this process, referring to Fig. 5, Joystick surpasses the used time t2 of handle anti-misoperation scope S401, handle anti-misoperation scope 401 is Joystick from original state to the lever operated zone the handle anti-misoperation angle value α 1, when this is main in order to prevent misoperation, the operator pulls Joystick, the current signal that only has handle to reach to export behind certain drift angle could be so that the output control electric current of controller, this drift angle is exactly handle anti-misoperation angle value α 1, pull angle within α 1 scope the time at Joystick, its output signal is on not impact of controller output, the setting of this handle anti-misoperation angle value α 1 can prevent effectively that misoperation from causing the misoperation of electrohydraulic proportional directional valve, and t2 is exactly that Joystick breaks away from the handle anti-misoperation used time of scope S401 from beginning to pull.
As shown in Figure 5, pull in the process at above-mentioned Joystick, after Joystick surpasses handle anti-misoperation scope S401, in order to make main valve stem 2 fast conductings, controller will be exported the control electric current that a size is predetermined current value I0, and so that should keep predetermined current retention time t3 by the control electric current: in controlling method of the present invention, predetermined current value I0 is for after breaking away from handle anti-misoperation scope S401 when Joystick, the predetermined current value that controller is exported immediately, this predetermined current value can equal maximum rated control current value I-max, also can be less than maximum rated control current value I-max, but greater than valve rod conducting minimum drive current value I1; The occurrence of predetermined current retention time t3 can be according to the determination of property parameter of guide's solenoid-operated proportional reduction valve 1 of electrohydraulic proportional directional valve.Predetermined current value I0 and predetermined current retention time t3 can be so that guide's solenoid-operated proportional reduction valve 1 start fast, and output guide oil drives main valve stem 1 and moves the preliminary displacement L2 of valve rod in this predetermined current retention time t3.This valve rod just step displacement L2 is during the maintenance of controller output predetermined current value I0 (being t3), the displacement that main valve stem 2 moves, this displacement should less than valve rod conducting least displacement L1, like this, could open electrohydraulic proportional directional valve by subsequent operation more reposefully.
After Joystick breaks away from handle anti-misoperation scope S401, as mentioned above, control electric current by above-mentioned predetermined current value I0, so that thereby guide's solenoid-operated proportional reduction valve 1 starts fast and drives main valve stem 2 and move just step displacement L2 of a valve rod, like this can be so that main valve stem 2 can break away from valve rod cut-off scope S403 (being that main valve stem 2 begins to be communicated with the displacement range the position of filler opening and actuator port from initial position to the main valve stem conducting) fast.But, when opening, produce larger impact in order to prevent electrohydraulic proportional directional valve, before main valve stem 2 breaks away from valve rod cut-off scope S403, namely before the logical least displacement L1 of main valve stem 1 movement of valve rod guidance, need the increase so that the control current value can make progress slowly.Above-mentioned valve rod conducting least displacement L1, be as mentioned above the displacement of main valve stem 2 during less than L1 filler opening and the actuator port of electrohydraulic proportional directional valve be in closed state, when the displacement of main valve stem 2 during greater than L1, filler opening and actuator port are in on-state.For this reason, control electric current with controller output drops under the valve rod conducting minimum drive current value I1 before this, this valve rod conducting minimum drive current value I1 namely can promote the minimum current value that main valve stem 1 breaks away from valve rod cut-off scope, and the output current of controller is the invalid scope S402 of electric current from the current range 0 to valve rod conducting minimum drive current value I1, in the invalid scope of this electric current, although electric current output is arranged, but electrohydraulic proportional directional valve 100 work (be that is to say, the control electric current of controller output is from 0 to valve rod conducting minimum drive current value I1, when electric current reaches certain value, although guide's solenoid-operated proportional reduction valve is started working, and guide oil has begun to promote main valve stem and has moved, but the displacement that valve rod can move is less than L1, so electrohydraulic proportional directional valve 100 can not be worked).When the control electric current of controller output reaches valve rod conducting minimum drive current value I1, under this function of current, the guide oil of guide's solenoid-operated proportional reduction valve 1 output will promote the least displacement L1 that main valve stem 2 moves to the main valve stem conducting, when the controller output current continues to increase, main valve stem 2 is with conducting, and at this moment electrohydraulic proportional directional valve will be started working.
After above-mentioned predetermined current retention time t3, so that the control electric current drops to the buffer current value I2 less than valve rod conducting minimum drive current value I1, then (Fig. 5 is shown as linear growth for convenience of description so that the control electric current of controller output will be set the growth slope according to first, but technical conceive of the present invention comprises curve to be increased, therefore this first setting growth slope is first and sets rate of rise), be increased to valve rod conducting minimum drive current value I1 and further rise to maximum rated control current value I-max from buffering current value I 2 along with the increase of handle drift angle, thereby continue to promote main valve stem 2 and break away from valve rod cut-off scope S403, be communicated with actuator port so that be communicated with filler opening, this need to expend the regular hour, be that oil duct is connected the t4 that sets aside some time, the namely displacement of main valve stem 2 is increased to the used time of least displacement L1 of main valve stem conducting by the first step displacement L2 of valve rod.By above-mentioned control procedure, the operating delay time of electrohydraulic proportional directional valve of the present invention is t1 (being t2+t3+t4).
In sum, the basic fundamental design of this controlling method is that the operator pulls Joystick, pull in the process at Joystick, when the drift angle of Joystick surpasses handle anti-misoperation angle value α 1, so that the output of controller size is the control electric current of predetermined current value I0, the control electric current of controller output predetermined current value I0 is kept predetermined current retention time t3, during this period, mobile under the guide oil effect of formerly conductive magnetism proportional pressure-reducing valve 1 output of main valve stem 2, final displacement distance is just step displacement L2 of valve rod, after keeping predetermined current retention time t3, so that the output current of controller is reduced to the buffer current value I2 that is lower than valve rod conducting minimum drive current value I1, afterwards, so that will setting the growth slope according to first, the controller output current is increased to gradually maximum rated control current value I-max by buffer current value I2, during this period, the displacement of main valve stem 2 will be increased to main valve stem maximum displacement L-max gradually by the first step displacement L2 of valve rod, in this section main valve stem 2 moving process, main valve stem 2 will be by this position of valve rod conducting least displacement L1, because the control electric current of this section shift controller output is to set according to first to increase the slope growth, main valve stem 2 moves also milder, thus can so that electrohydraulic proportional directional valve can open more stably.
In whole operating process, before main valve stem 2 moves to valve rod conducting least displacement L1, controller is to the control electric current of a larger predetermined current value I0 of guide's solenoid-operated proportional reduction valve 1 input, this control electric current can impel main valve stem 2 to move rapidly, and the preliminary displacement L2 of mobile valve rod, because this section process main valve stem 2 moves rapidly, so can shorten to a certain extent the time-delay response time of electrohydraulic proportional directional valve; In addition, predetermined current retention time displacement of valve rod L2 is slightly less than valve rod conducting least displacement L1, and the controller output current is set growth slope (namely first setting rate of rise) growth according to first after this, so larger predetermined current value I0 can not affect electrohydraulic proportional directional valve unlatching performance before.
By upper description as seen, the key technology point of electrohydraulic proportional directional valve controlling method of the present invention is that Joystick pulls above after the handle anti-misoperation scope, so that the control electric current rises to predetermined current value I0 in a short period of time, when main valve stem 2 not yet reaches valve rod conducting least displacement L1, the controller output current value drops under the valve rod conducting minimum drive current value I1 again, and make the current value size be increased to gradually maximum rated control current value I-max according to the first setting growth slope by buffer current value I2, like this, can shorten the response time of electrohydraulic proportional directional valve, produce larger impact when electrohydraulic proportional directional valve is opened.In addition, should be noted that following 2 points: one, valve rod just step displacement L2 generally are slightly less than valve rod conducting least displacement L1, and preferably the distance less than valve rod conducting least displacement L1 is 0.2mm-2mm; They are two years old, predetermined current value I0, its size is set in and promotes between main valve stem conducting minimum current I 1 and the maximum rated control current value I-max, that predetermined current value I0 is larger on the principle, the effect that shortens the electrohydraulic proportional directional valve time-delay response time is more obvious, but the setting that should be worth generally needs the guide's solenoid-operated proportional reduction valve determination of property parameter according to electrohydraulic proportional directional valve, preferably can equal maximum rated control current value I-max.
Electrohydraulic proportional directional valve controlling method of the present invention can be applicable to engineering mechanical device at large with the control of electrohydraulic proportional directional valve, is particularly useful for the control that crane is used electrohydraulic proportional directional valve
The present invention is not limited to above-mentioned mode of execution, preferably, as shown in Figure 6, after Joystick is pulled above handle anti-misoperation scope S401, electric current is in the process that rises to predetermined current value I0, in order to reduce electric current to the impact of guide's solenoid-operated proportional reduction valve, the control electric current can arrange to set with second and increases slope (i.e. the second setting rate of rise, show as slope because of the linear expression form among Fig. 5 and Fig. 6) rise to gradually predetermined current value I0, its slope size can be determined according to the shock resistance of guide's solenoid-operated proportional reduction valve by those skilled in the art, this slope operated by rotary motion must be larger, so that the output current of controller is climbed to predetermined current value I0.In addition, referring to Fig. 6, preferably, through after the predetermined current retention time t3, described controller 5 so that described control electric current with predetermined descending slope so that drop to buffer current value I2 less than described valve rod conducting minimum drive current value I1 from predetermined current value I0.So also can avoid controlling current break electrohydraulic proportional directional valve is formed impact.
On the basis of above-mentioned electrohydraulic proportional directional valve controlling method, the present invention also provides a kind of control system for electro-hydraulic proportional, referring to shown in Figure 7, control system for electro-hydraulic proportional of the present invention comprises Joystick 4, electrohydraulic proportional directional valve 100 and controller 5, wherein, Joystick 4 and electrohydraulic proportional directional valve 5 are electrically connected on respectively controller 5 (for example by connection or wireless connections), and this controller 5 has be used to receiving described Joystick to be pulled the signal receiving module of declination signal and be used for control module to described electrohydraulic proportional directional valve 100 pipage control electric currents.
Described controller 5 carries size to be the control electric current of predetermined current value I0 to described electrohydraulic proportional directional valve in the drift angle of pulling of described Joystick 4 when surpassing handle anti-misoperation angle value α 1, and so that this control keeps predetermined current retention time t3, described predetermined current value I0 is greater than valve rod conducting minimum drive current value I1.Preferably, described predetermined current value I0 equals maximum rated control current value I-max.In this embodiment, the predetermined current retention time, t3 can select as required, for example so that electrohydraulic proportional directional valve passes through this predetermined current retention time t3 and conducting, certainly, can cause under this mode having certain impact in the solenoid-operated proportional directional control valve opening process, thereby only as a selectable technological scheme of control system.
Further preferably, the control electric current that described controller 5 is carried to described electrohydraulic proportional directional valve increases slope (namely second setting rate of rise) with above-mentioned the second setting and rises to predetermined current value I0, can reduce like this electric current to the impact of guide's solenoid-operated proportional reduction valve
In order to prevent that electrohydraulic proportional directional valve from producing larger impact when opening, further, described controller 5 moves just step displacement L2 of a valve rod at the main valve stem 2 that predetermined current retention time t3 drives described electrohydraulic proportional directional valve, just step displacement L2 is less than valve rod conducting least displacement L1 for this valve rod, and preferably the distance less than valve rod conducting least displacement L1 is 0.2mm-2mm.Described controller 5 and then so that described control electric current drops to buffer current value I2 less than described valve rod conducting minimum drive current value I1 from predetermined current value I0, and set according to first and to increase slope (i.e. the first setting rate of rise) so that this buffer current value I2 is increased to maximum rated control current value I-max gradually.
In above-mentioned solenoid-operated proportional directional control valve control system, preferably, described controller 4 so that described control electric current with predetermined lowering speed so that drop to buffer current value I2 less than described valve rod conducting minimum drive current value I1 from predetermined current value I0.Can avoid like this controlling current break electrohydraulic proportional directional valve is formed impact.
Particularly, as shown in Figure 1, described electrohydraulic proportional directional valve is provided with the guide's solenoid electric valve for pilot control, and this guide's solenoid electric valve is electrically connected on described controller 5.Preferably, described pilot-actuated valve is guide's solenoid-operated proportional reduction valve 1, certainly, pilot-actuated valve also can be the solenoid electric valve of other type, as long as can it according to control electric current of controller guide oil be transported to main valve stem 2 and move to drive main valve stem.
Described controller 5 can be selected multiple known controller, for example single-chip microcomputer, electronic control unit, and preferably, described controller 5 is programmable controller.
Can be found out by upper description, electrohydraulic proportional directional valve controlling method of the present invention and control system thereof can be on the bases that does not affect the original performance of electrohydraulic proportional directional valve, shorten largely the response time of electrohydraulic proportional directional valve operation, and then improved the overall performance of electrohydraulic proportional directional valve, thereby from agility and the flexibility of whole betterment works machinery work, increase work efficiency.In addition, electrohydraulic proportional directional valve controlling method of the present invention and control system thereof only need the control program of controller is changed accordingly, can not increase extra manufacture cost, it can shorten the operation response time of engineering machinery liquid proportional directional control valve effectively, its successful, it is convenient to realize.
Below describe by reference to the accompanying drawings preferred implementation of the present invention in detail; but; the present invention is not limited to the detail in the above-mentioned mode of execution; in technical conceive scope of the present invention; can carry out multiple simple variant to technological scheme of the present invention, these simple variant all belong to protection scope of the present invention.
Need to prove that in addition each the concrete technical characteristics described in above-mentioned embodiment in reconcilable situation, can make up by any suitable mode.For fear of unnecessary repetition, the present invention is to the no longer separately explanation of various possible compound modes.
In addition, also can carry out combination in any between the various mode of execution of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (17)
1. electrohydraulic proportional directional valve controlling method, comprise with Joystick (4) from original state pull handle drift angle maximum value (α-max), wherein,
After the drift angle of described Joystick surpasses handle anti-misoperation scope (S401), carry the control electric current of predetermined current value (I0) to electric-hydraulic proportion position control valve (100), and so that should keep the predetermined current retention time (t3) by the control electric current, with the preliminary displacement of the mobile valve rod of main valve stem (2) (L2) that drives described electrohydraulic proportional directional valve, wherein said predetermined current value (I0) is greater than valve rod conducting minimum drive current value (I1), and the first step displacement of described valve rod is less than valve rod conducting least displacement (L1);
Passing through described predetermined current after the retention time, so that described control electric current drops to the buffer current value (I2) less than described valve rod conducting minimum drive current value (I1), and then so that this control electric current is set rate of rise is increased to described electrohydraulic proportional directional valve from this buffer current value maximum rated control current value (I-max) according to first.
2. electrohydraulic proportional directional valve controlling method according to claim 1, wherein, described predetermined current value (I0) equals described maximum rated control current value (I-max).
3. electrohydraulic proportional directional valve controlling method according to claim 1, wherein, described valve rod just step displacement (L2) than the little 0.2-2mm of described valve rod conducting least displacement (L1).
4. electrohydraulic proportional directional valve controlling method according to claim 1, wherein, after the drift angle of described Joystick surpasses described handle anti-misoperation scope (S401), so that the control electric current of carrying to described electric-hydraulic proportion position control valve (100) rises to described predetermined current value (I0) with the second setting rate of rise.
5. electrohydraulic proportional directional valve controlling method according to claim 1, wherein, in process described predetermined current retention time (t3) afterwards, so that described control electric current drops to described buffer current value (I2) with predetermined lowering speed from described predetermined current value (I0).
6. electrohydraulic proportional directional valve controlling method according to claim 1 wherein, is carried described control electric current by controller (5) to described electrohydraulic proportional directional valve.
7. each described electrohydraulic proportional directional valve controlling method in 6 according to claim 1, wherein, described electrohydraulic proportional directional valve has the guide's solenoid-operated proportional reduction valve (1) for pilot control, and described control electric current is transported to this guide's solenoid-operated proportional reduction valve.
8. control system for electro-hydraulic proportional, comprise Joystick (4), electrohydraulic proportional directional valve (100) and controller (5), wherein, described Joystick and electrohydraulic proportional directional valve are electrically connected on respectively described controller, and this controling appliance is useful on the signal receiving module that receives described Joystick declination signal and is used for control module to described electrohydraulic proportional directional valve pipage control electric current; When surpassing handle anti-misoperation angle value (α 1) in the drift angle of described Joystick (4), described controller (5) carries the control electric current of predetermined current value (I0) to described electrohydraulic proportional directional valve (100), and so that this control electric current keeps the predetermined current retention time (t3), described predetermined current value is greater than valve rod conducting minimum drive current value (I1).
9. control system for electro-hydraulic proportional according to claim 8, wherein, described predetermined current value (I0) equals the maximum rated control current value (I-max) of described electrohydraulic proportional directional valve.
10. control system for electro-hydraulic proportional according to claim 8, wherein, the control electric current that described controller (5) is carried to described electrohydraulic proportional directional valve is set rate of rise with second and is risen to described predetermined current value (I0).
11. control system for electro-hydraulic proportional according to claim 8, wherein, described control electric current drives the preliminary displacement of the mobile valve rod of main valve stem (2) (L2) of described electrohydraulic proportional directional valve within the described predetermined current retention time (t3), the first step displacement of this valve rod is less than valve rod conducting least displacement (L1).
12. control system for electro-hydraulic proportional according to claim 11, wherein, the first step displacement (L2) of described valve rod is than the little 0.2-2mm of described valve rod conducting least displacement (L1).
13. control system for electro-hydraulic proportional according to claim 11, wherein, described controller (5) after described predetermined current retention time (t3) so that this control electric current drops to buffer current value (I2) less than described valve rod conducting minimum drive current value (I1) from described predetermined current value (I0), and so that this buffer current value is increased to the maximum rated control current value (I-max) of described electrohydraulic proportional directional valve with the first setting rate of rise.
14. control system for electro-hydraulic proportional according to claim 13, described controller (5) is so that described control electric current drops to described buffer current value (I2) with predetermined lowering speed from described predetermined current value (I0).
15. each described control system for electro-hydraulic proportional in 14 according to claim 8, described electrohydraulic proportional directional valve is provided with the guide's solenoid electric valve for pilot control, and this guide's solenoid electric valve is electrically connected on described controller (5).
16. control system for electro-hydraulic proportional according to claim 15, wherein, described guide's solenoid electric valve is guide's solenoid-operated proportional reduction valve (1).
17. control system for electro-hydraulic proportional according to claim 15, wherein, described controller (5) is programmable controller.
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| CN114893459B (en) * | 2022-04-25 | 2024-05-24 | 阳春新钢铁有限责任公司 | Electrode lifting hydraulic conversion standby system for LF refining furnace |
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| JP4920970B2 (en) * | 2005-12-27 | 2012-04-18 | 東京計器株式会社 | Current control circuit |
| CN101463849B (en) * | 2009-01-12 | 2012-05-16 | 天水锻压机床有限公司 | Hydraulic electrohydraulic ratio control system and method for prebending machine |
| DE102010045504A1 (en) * | 2010-09-15 | 2012-03-15 | Robert Bosch Gmbh | Method for controlling a ballistic movement of a blocking body of a valve |
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