CN102392914A - 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 is applicable to that mainly engineering mechanical device uses electrohydraulic proportional directional valve, is particularly useful for crane and uses electrohydraulic proportional directional valve.In addition, the invention still further relates to a kind of electrohydraulic proportional directional valve control system.
Background technique
Along with the raising day by day of industrial automation level, engineering mechanical device, for example the pressure of the hydraulic system of crane requirement hydraulic oil and flow etc. can be controlled continuously or pro rata.Under this situation, electro-hydraulic proportional valve obtains increasingly extensive application.Though the type of electro-hydraulic proportional valve is varied; But its structural principle is similar basically; Generally be made up of proportion electro-magnet and hydraulic control valve two-part, proportion electro-magnet receives the electrical signal of input, produces electromagnetic force continuously or pari passu; The valve rod of hydraulic control valve receives the electromagnetic force effect, controls the pressure and the flow of hydraulic oil continuously or pari passu.
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 general bigger, for flexibility and the portability that strengthens operation, this project machinery is with this employing of electric-hydraulic proportion valve base guide 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 through control guide solenoid-operated proportional reduction valve 1, thereby realizes switching-over.
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 requirement, and influence the working efficiency and the performance thereof of complete machine.
Specifically can therefrom can find out, when the said electrohydraulic proportional directional valve of operation referring to shown in Figure 2; Operating control handle at first; Generally all can there be handle anti-misoperation angle value (for example 3 ° shown in Fig. 2) in Joystick, and when having only the handle drift angle to surpass this handle anti-misoperation angle value when promptly 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 guide controls oil promotion main valve stem 2 and moves, and at a mobile segment distance (the for example 3mm shown in Fig. 2), the corresponding work hydraulic fluid 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; Existing technology mainly adopts following three kinds of solutions: first; Increase the rated flow of guide's solenoid-operated proportional reduction valve 1; Promptly accelerate driving, thereby shorten the deferred reaction time of above-mentioned electrohydraulic proportional directional valve main valve stem through the output flow that increases guide's solenoid-operated proportional reduction valve 1; The secondth, reduce the diameter of main valve stem 2; Referring to shown in Figure 1; In the unit time, can increase the stroke of main valve stem in the unit time under the situation of identical supply volume fluid like this; Also can alleviate simultaneously the weight of main valve stem 2, make main valve stem under identical driving force situation, have travelling speed faster, shorten the deferred reaction time of electrohydraulic proportional directional valve thus; The 3rd is to improve electric current to advance the speed; Referring to shown in Figure 2; This can be through dwindling handle anti-misoperation scope or the slope that directly increases current curve is realized; This mode mainly is through making the control electric current of guide's solenoid-operated proportional reduction valve 1 increase fast, thereby increases its delivery pressure, thereby increases the driving force to main valve stem 2; This can shorten electrohydraulic proportional directional valve operation response time, the 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; Though it can play certain effect; But the response delay effect to reducing electrohydraulic proportional directional valve is limited; Owing to need significantly transform existing electrohydraulic proportional directional valve, this obviously can increase bigger 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, is easy to generate the misoperation of handle.In addition; If directly increase the slope of control current curve; Though 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 that 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 shorten its operation response time largely on the basis that does not influence the existing performance of electrohydraulic proportional directional valve.
On this basis; The further technical problem to be solved of the present invention is that a kind of electrohydraulic proportional directional valve control system will be provided; This electrohydraulic proportional directional valve control system 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 present invention provides a kind of electrohydraulic proportional directional valve controlling method, and 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 said Joystick surpasses handle anti-misoperation scope; Carry the control electric current of predetermined current value to the electric-hydraulic proportion position control valve, and make and to 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 said 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 said valve rod is less than valve rod conducting least displacement; Passing through said predetermined current after the retention time; Make said control electric current drop to buffer current value, and then make this control electric current set rate of rise is increased to said electrohydraulic proportional directional valve from this buffer current value maximum rated control current value according to first less than said valve rod conducting minimum drive current value.
Preferably, said predetermined current value equals said maximum rated control current value.
Particularly, the first step displacement of said valve rod is than the little 0.2-2mm of said valve rod conducting least displacement.
Preferably, after the drift angle of said Joystick surpasses said handle anti-misoperation scope, make the control electric current of carrying to said electric-hydraulic proportion position control valve rise to said predetermined current value with the second setting rate of rise.
Preferably, after the retention time, making said control electric current drop to said buffer current value from said predetermined current value through said predetermined current with predetermined lowering speed.
Specifically selectively, carry said control electric current through controller to said electrohydraulic proportional directional valve.
Particularly, said electrohydraulic proportional directional valve has the guide's solenoid-operated proportional reduction valve that is used for guide's control, and said 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 electrohydraulic proportional directional valve control system; This electric-hydraulic proportion heading control loop comprises Joystick, electrohydraulic proportional directional valve and controller; Wherein, said Joystick and electrohydraulic proportional directional valve are electrically connected on said controller respectively, and this controling appliance is useful on signal receiving module that receives said Joystick declination signal and the control module that is used for carrying to said electrohydraulic proportional directional valve the control electric current.
Particularly; When surpassing handle anti-misoperation angle value in the drift angle of said Joystick, said controller carries the control electric current of a predetermined current value to said electrohydraulic proportional directional valve; And make and to keep the predetermined current retention time by the control electric current that said predetermined current value is greater than valve rod conducting minimum drive current value.
Preferably, said predetermined current value equals the maximum rated control current value of said electrohydraulic proportional directional valve.
Preferably, said controller is set rate of rise to the control electric current of said electrohydraulic proportional directional valve conveying with second and is risen to said predetermined current value.
Particularly, said control electric current moves valve rod step displacement just at said predetermined current drives said 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 first step displacement of said valve rod is than the little 0.2-2mm of said valve rod conducting least displacement.
Preferably; Said controller is making this control electric current drop to the buffer current value less than said valve rod conducting minimum drive current value from said predetermined current value through said predetermined current after the retention time, and makes this buffer current value set the maximum rated control current value that rate of rise is increased to said electrohydraulic proportional directional valve with first.
Preferably, said controller makes said control electric current drop to said buffer current value with predetermined lowering speed from said predetermined current value.
Particularly, said electrohydraulic proportional directional valve is provided with the guide's solenoid electric valve that is used for guide's control, and this guide's solenoid electric valve is electrically connected on said controller.
Preferably, said guide's solenoid electric valve is guide's solenoid-operated proportional reduction valve.
Preferably, said controller is a 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 influence the original performance of electrohydraulic proportional directional valve; Shorten the response time of electrohydraulic proportional directional valve operation largely; And then improve the complete machine performance of electrohydraulic proportional directional valve, thereby, improved working efficiency from the agility and the flexibility of whole betterment works machinery work.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 with electrohydraulic proportional directional valve effectively, and its effect is obvious, and it is convenient to realize.
Other features and advantages of the present invention will partly specify in embodiment subsequently.
Description of drawings
Attached drawings is used to provide further understanding of the present invention, and constitutes the part of specification, and it is used to explain the present invention with following embodiment, but protection scope of the present invention is not limited to following accompanying drawing and embodiment.In the accompanying drawings:
Fig. 1 is the structural representation of electrohydraulic proportional directional valve;
Fig. 2 is electrohydraulic proportional directional valve shown in Figure 1 Control 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 representation 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 representation of electrohydraulic proportional directional valve control system 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; The S403 valve rod is by scope;
B401 handle drift angle coordinate axes; B402 control electric current coordinate axes;
B403 stem travel coordinate axes; B404 actuator port flow coordinate axes;
X401 handle drift angle line style; X402 control electric current line style;
X403 stem travel line style; X404 actuator port flow line style.
Embodiment
Be elaborated below in conjunction with the accompanying drawing specific embodiments of the invention, should be understood that, embodiment described herein only is used for explanation and explains 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 electrical signal with the signal of movement range and is transferred to controller; Controller is handled electrical signal, will 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 through the control of control electric current; Move thereby promote main valve stem 2, 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.Under this situation; Controller can be directly carried the control electric current to the proportion electro-magnet of electrohydraulic proportional directional valve, and 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 with engineering mechanical device shown in Figure 1 be that example is set forth controlling method of the present invention.
Analysis through preceding text can be known; In the operating process of electrohydraulic proportional directional valve; Response delay time t (see figure 2) in the existing controlling method of electrohydraulic proportional directional valve is mainly caused by this tetrameric response time-delay stack of controller current-responsive time-delay (mainly showing as lever operated delay), guide's solenoid-operated proportional reduction valve response time-delay (proportion electro-magnet produces enough electromagnetic forces needs the regular hour), 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); 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, shorten this two-part response delay time effectively and can solve this problem of electrohydraulic proportional directional valve operation response time-delay preferably.
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, and this is corresponding with Fig. 5, when promptly having only the main valve stem stroke to reach valve rod conducting least displacement L1; Actuator port 302 just can have flow, promptly external fuel feeding (referring to the actuator port flow line style X404 among Fig. 5); When main valve stem 2 reverse moving, actuator port 302 is 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, and Fig. 5 selects topmost response constituent element to show, possibly have small response lag in two kinds of response convergence process; But since small to the operation response time-delay influence 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 promptly handles Joystick from the operator and begins to move electrohydraulic proportional directional valve and have flow to export the used time.Wherein, B401 is a handle drift angle coordinate axes, representes that promptly handle pulls the coordinate axes of angle, and α-max is a 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; Generally by controller output, I-max is the maximum rated control current value of electrohydraulic proportional directional valve to the control electric current on this coordinate axes, promptly when Joystick reaches the sail angle value; The maximum current that the stable back of controller electric current output can be exported, this is generally corresponding to the maximum rated control current value of electrohydraulic proportional directional valve; B403 is the stem travel coordinate axes, promptly representes the coordinate axes of main valve stem 2 displacement distances size, and L-max is the main valve stem maximum displacement on this coordinate axes, promptly after the guide oil pressure reaches maximum value, can promote the maximum mobile position that main valve stem 2 can reach; B404 is an actuator port flow coordinate axes; The coordinate axes of promptly representing electrohydraulic proportional directional valve actuator port output flow size; P-max is the actuator port peak rate of flow on this coordinate axes; Promptly 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 be reflected in each Control Parameter and the relation between the response time in the operating process of solenoid-operated proportional directional control valve jointly.
In addition, in Fig. 5, X401 is a handle drift angle line style, i.e. dotted line among Fig. 5, line style that curve adopted of its expression handle drift angle size; X402 is control electric current line style, the line style that the curve of its expression control size of current adopts; X403 is the stem travel line style, the line style that the curve of its expression main valve stem 2 displacements size adopts; X404 is an 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 lines to describe, but according to the technical conceive of controlling method of the present invention; The design that makes output current and other correlation quantitys change with curve form also belongs to the technical conceive scope of this controlling method, therefore also belongs 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 pull Joystick 4, and Joystick is pulled handle drift angle maximum value α-max by original state, and maximum value α-max place stops in the handle drift angle.In this process; Referring to Fig. 5, Joystick surpasses the used time t2 of handle anti-misoperation scope S401, handle anti-misoperation scope 401 be 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, and the current signal that has only handle to reach to export behind certain drift angle could make the output control electric current of controller, and 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 to not influence of controller output, and 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 quick conductings; Controller will be exported the control electric current that a size is predetermined current value I0, and make and 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 confirmed according to the performance 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 make guide's solenoid-operated proportional reduction valve 1 start fast, and the output guide oil, in this predetermined current retention time t3, drive main valve stem 1 and move the preliminary displacement L2 of valve rod.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 is moved; This displacement should like this, could open electrohydraulic proportional directional valve through subsequent operation less than valve rod conducting least displacement L1 more reposefully.
After Joystick breaks away from handle anti-misoperation scope S401; As stated; Control electric current through above-mentioned predetermined current value I0; Thereby making guide's solenoid-operated proportional reduction valve 1 start fast to drive main valve stem 2 moves valve rod step displacement L2 just, like this can be so that main valve stem 2 can break away from valve rod fast by 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).But, when opening, produce bigger impact in order to prevent electrohydraulic proportional directional valve, broke away from valve rods before scope S403 at main valve stem 2, promptly before the logical least displacement L1 of main valve stem 1 movement of valve rod guidance, need to make the increase that can make progress slowly of control current value.Above-mentioned valve rod conducting least displacement L1, be as stated the displacement of main valve stem 2 during less than L1 the 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, the control electric current with controller output drops under the valve rod conducting minimum drive current value I1 before this, and this valve rod conducting minimum drive current value I1 promptly can promote main valve stem 1 and break away from the minimum current value of valve rod by 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,, electrohydraulic proportional directional valve 100 work (that is to say although electric current output is arranged; The control electric current of controller output is from 0 to valve rod conducting minimum drive current value I1; When electric current reached certain value, although guide's solenoid-operated proportional reduction valve is started working, and guide oil had 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 continued to increase, main valve stem 2 was with conducting, and at this moment electrohydraulic proportional directional valve will be started working.
After above-mentioned predetermined current retention time t3; Make the control electric current drop to buffer current value I2 less than valve rod conducting minimum drive current value I1; The control electric current that makes controller export then will be set the growth slope according to first, and (Fig. 5 conveniently is shown as linear growth for describing; 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 promotion main valve stem 2 disengaging valve rods by scope S403; Make that being communicated with filler opening is communicated with actuator port; This need expend the regular hour, and promptly oil duct is connected the t4 that sets aside some time, and the displacement of main valve stem 2 just is increased to the used time of least displacement L1 of main valve stem conducting by the first step displacement L2 of valve rod.Through 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 design of the basic fundamental of this controlling method is that the operator pulls Joystick, pulls in the process at Joystick; When the drift angle of Joystick surpasses handle anti-misoperation angle value α 1, make the output size of controller be 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; The guide oil effect of main valve stem 2 conductive magnetism proportional pressure-reducing valve 1 output is formerly moved down, and final displacement distance is valve rod step displacement L2 just, after keeping predetermined current retention time t3; Make the output current of controller reduce to the buffer current value I2 that is lower than valve rod conducting minimum drive current value I1; Afterwards, make the controller output current to set the growth slope and be increased to maximum rated control current value I-max gradually, during this period by buffer current value I2 according to first; 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 through 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 relatively milder, so can make electrohydraulic proportional directional valve to open more stably.
In the whole operation process; Before main valve stem 2 moves to valve rod conducting least displacement L1; Controller is given the control electric current of big predetermined current value I0 of guide's solenoid-operated proportional reduction valve 1 input, and 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 the time-delay response time of electrohydraulic proportional directional valve to a certain extent; 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 (promptly first setting rate of rise) growth according to first after this, opens performance so bigger before predetermined current value I0 can not influence electrohydraulic proportional directional valve.
Visible by last description; 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; Make the control electric current rise to predetermined current value I0 in a short period of time, when main valve stem 2 did not reach valve rod conducting least displacement L1 as yet, the controller output current value dropped under the valve rod conducting minimum drive current value I1 again; And make the current value size be increased to maximum rated control current value I-max gradually by buffer current value I2 according to the first setting growth slope; Like this, can shorten the response time of electrohydraulic proportional directional valve, produce bigger impact when electrohydraulic proportional directional valve is opened.In addition, should be noted that following 2 points: one of which, 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, is that predetermined current value I0 is big more on the principle, and the effect that shortens the electrohydraulic proportional directional valve time-delay response time is obvious more; But the setting that should be worth generally needs to confirm according to guide's solenoid-operated proportional reduction valve performance parameter of 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 the control of engineering mechanical device with electrohydraulic proportional directional valve at large, is particularly useful for the control of crane with electrohydraulic proportional directional valve
The present invention is not limited to above-mentioned mode of execution; Preferably; As shown in Figure 6, after Joystick was pulled above handle anti-misoperation scope S401, electric current was in the process that rises to predetermined current value I0; In order to reduce the impact of electric current to guide's solenoid-operated proportional reduction valve; The control electric current can be provided with to set with second and increases slope (promptly second set rate of rise, show as slope because of the linear expression form among Fig. 5 and Fig. 6) and rise to predetermined current value I0 gradually, and its slope size can be definite 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 bigger, so that the output current of controller is climbed to predetermined current value I0.In addition; Referring to Fig. 6; Preferably, after process predetermined current retention time t3, said controller 5 makes said control electric current drop to the buffer current value I2 less than said valve rod conducting minimum drive current value I1 so that predetermined descending slope is feasible 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 electrohydraulic proportional directional valve control system; Referring to shown in Figure 7; Electrohydraulic proportional directional valve control system of the present invention comprises Joystick 4, electrohydraulic proportional directional valve 100 and controller 5; Wherein, Joystick 4 is electrically connected on controller 5 (for example being connected or wireless connections through circuit) respectively with electrohydraulic proportional directional valve 5, and this controller 5 has and is used to receive the signal receiving module and the control module that is used for carrying the control electric currents to said electrohydraulic proportional directional valve 100 that said Joystick is pulled declination signal.
Said controller 5 carries size to be the control electric current of predetermined current value I0 to said electrohydraulic proportional directional valve in the drift angle of pulling of said Joystick 4 when surpassing handle anti-misoperation angle value α 1; And make and control to keep predetermined current retention time t3 that said predetermined current value I0 is greater than valve rod conducting minimum drive current value I1.Preferably, said 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 make electrohydraulic proportional directional valve pass 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 said controller 5 is carried to said electrohydraulic proportional directional valve increases slope (promptly second setting rate of rise) with above-mentioned second setting and rises to predetermined current value I0; Can reduce the impact of electric current like this to guide's solenoid-operated proportional reduction valve
In order to prevent that electrohydraulic proportional directional valve from producing bigger impact when opening; Further; Said controller 5 moves valve rod step displacement L2 just at the main valve stem 2 that predetermined current retention time t3 drives said 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.Said controller 5 and then make said control electric current drop to buffer current value I2 less than said 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) and make this buffer current value I2 be increased to maximum rated control current value I-max gradually.
In above-mentioned solenoid-operated proportional directional control valve control system, preferably, said controller 4 makes said control electric current drop to the buffer current value I2 less than said valve rod conducting minimum drive current value I1 so that predetermined lowering speed is feasible from predetermined current value I0.Can avoid controlling current break like this electrohydraulic proportional directional valve is formed impact.
Particularly, as shown in Figure 1, said electrohydraulic proportional directional valve is provided with the guide's solenoid electric valve that is used for guide's control, and this guide's solenoid electric valve is electrically connected on said controller 5.Preferably; Said 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.
Said controller 5 can be selected multiple known controller, for example single-chip microcomputer, electronic control unit, and preferably, said controller 5 is a programmable controller.
Can find out by last description; Electrohydraulic proportional directional valve controlling method of the present invention and control system thereof can be on the bases that does not influence the original performance of electrohydraulic proportional directional valve; Shorten the response time of electrohydraulic proportional directional valve operation largely; And then improved the complete machine performance of electrohydraulic proportional directional valve, thereby, increase work efficiency from the agility and the flexibility of whole betterment works machinery work.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 with electrohydraulic proportional directional valve effectively, and its effect is obvious, and it is convenient to realize.
More than combine accompanying drawing to describe 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 under reconcilable situation, can make up through any suitable manner.For fear of unnecessary repetition, the present invention is to the explanation no longer separately 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 regarded as the disclosed content of the present invention equally.
Claims (18)
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 said 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 make and to keep the predetermined current retention time (t3) by the control electric current; Main valve stem (2) to drive said electrohydraulic proportional directional valve moves the preliminary displacement of valve rod (L2), and wherein said predetermined current value (I0) is greater than valve rod conducting minimum drive current value (I1), and the first step displacement of said valve rod is less than valve rod conducting least displacement (L1);
Passing through said predetermined current after the retention time; Make said control electric current drop to buffer current value (I2), and then make this control electric current set rate of rise is increased to said electrohydraulic proportional directional valve from this buffer current value maximum rated control current value (I-max) according to first less than said valve rod conducting minimum drive current value (I1).
2. electrohydraulic proportional directional valve controlling method according to claim 1, wherein, said predetermined current value (I0) equals said maximum rated control current value (I-max).
3. electrohydraulic proportional directional valve controlling method according to claim 1, wherein, the first step displacement (L2) of said valve rod is than the little 0.2-2mm of said valve rod conducting least displacement (L1).
4. electrohydraulic proportional directional valve controlling method according to claim 1; Wherein, After the drift angle of said Joystick surpasses said handle anti-misoperation scope (S401), make the control electric current of carrying to said electric-hydraulic proportion position control valve (100) rise to said 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 said predetermined current retention time (t3) afterwards, make said control electric current drop to said buffer current value (I2) from said predetermined current value (I0) with predetermined lowering speed.
6. electrohydraulic proportional directional valve controlling method according to claim 1 wherein, is carried said control electric current through controller (5) to said electrohydraulic proportional directional valve.
7. according to each described electrohydraulic proportional directional valve controlling method in the claim 1 to 6, wherein, said electrohydraulic proportional directional valve has the guide's solenoid-operated proportional reduction valve (1) that is used for guide's control, and said control electric current is transported to this guide's solenoid-operated proportional reduction valve.
8. electrohydraulic proportional directional valve control system; Comprise Joystick (4), electrohydraulic proportional directional valve (100) and controller (5); Wherein, Said Joystick and electrohydraulic proportional directional valve are electrically connected on said controller respectively, and this controling appliance is useful on signal receiving module that receives said Joystick declination signal and the control module that is used for carrying to said electrohydraulic proportional directional valve the control electric current.
9. electrohydraulic proportional directional valve control system according to claim 8; Wherein, When surpassing handle anti-misoperation angle value (α 1) in the drift angle of said Joystick (4), said controller (5) carries the control electric current of predetermined current value (I0) to said electrohydraulic proportional directional valve (100); And make and to keep the predetermined current retention time (t3) by the control electric current that said predetermined current value is greater than valve rod conducting minimum drive current value (I1).
10. electrohydraulic proportional directional valve control system according to claim 9, wherein, said predetermined current value (I0) equals the maximum rated control current value (I-max) of said electrohydraulic proportional directional valve.
11. electrohydraulic proportional directional valve control system according to claim 9, wherein, the control electric current that said controller (5) is carried to said electrohydraulic proportional directional valve is set rate of rise with second and is risen to said predetermined current value (I0).
12. electrohydraulic proportional directional valve control system according to claim 9; Wherein, Said control electric current drives said electrohydraulic proportional directional valve in the said predetermined current retention time (t3) main valve stem (2) moves the preliminary displacement of valve rod (L2), and the first step displacement of this valve rod is less than valve rod conducting least displacement (L1).
13. electrohydraulic proportional directional valve control system according to claim 12, wherein, the first step displacement (L2) of said valve rod is than the little 0.2-2mm of said valve rod conducting least displacement (L1).
14. electrohydraulic proportional directional valve control system according to claim 12; Wherein, Said controller (5) is making that through said predetermined current retention time (t3) back this control electric current drops to the buffer current value (I2) less than said valve rod conducting minimum drive current value (I1) from said predetermined current value (I0), and makes this buffer current value set the maximum rated control current value (I-max) that rate of rise is increased to said electrohydraulic proportional directional valve with first.
15. electrohydraulic proportional directional valve control system according to claim 14, said controller (5) make said control electric current drop to said buffer current value (I2) with predetermined lowering speed from said predetermined current value (I0).
16. each described electrohydraulic proportional directional valve control system in 15 according to Claim 8, said electrohydraulic proportional directional valve is provided with the guide's solenoid electric valve that is used for guide's control, and this guide's solenoid electric valve is electrically connected on said controller (5).
17. electrohydraulic proportional directional valve control system according to claim 16, wherein, said guide's solenoid electric valve is guide's solenoid-operated proportional reduction valve (1).
18. electrohydraulic proportional directional valve control system according to claim 16, wherein, said controller (5) is a programmable controller.
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| CN110593964A (en) * | 2019-09-18 | 2019-12-20 | 湖北华电江陵发电有限公司 | Fault diagnosis method and system for quick closing valve and opening process of water supply pump steam turbine |
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| EP0872645A2 (en) * | 1997-04-14 | 1998-10-21 | Brevini Hydraulics S.p.A. | Electrohydraulic device for driving and remotely controlling a hydraulic distributor |
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| CN110593964A (en) * | 2019-09-18 | 2019-12-20 | 湖北华电江陵发电有限公司 | Fault diagnosis method and system for quick closing valve and opening process of water supply pump steam turbine |
| CN110593964B (en) * | 2019-09-18 | 2022-04-08 | 湖北华电江陵发电有限公司 | Fault diagnosis method and system for quick closing valve and opening process of water supply pump steam turbine |
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