CN1131289A - PWM proportional control method - Google Patents
PWM proportional control method Download PDFInfo
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- CN1131289A CN1131289A CN 95118949 CN95118949A CN1131289A CN 1131289 A CN1131289 A CN 1131289A CN 95118949 CN95118949 CN 95118949 CN 95118949 A CN95118949 A CN 95118949A CN 1131289 A CN1131289 A CN 1131289A
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- CN
- China
- Prior art keywords
- valve
- spool
- proportional
- width modulation
- pressure
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Abstract
The present invention relates to an electro-hydraulic proportional control method, in particular it is applicable to proportional direction valve, proportional flow valve and proportional pressure valve, etc., Said invention uses a pulse-width modulation high-speed digital valve as pilot valve and adopts a stable and symmetrical bridge circuit consisting of four coiled linear liquid resistors, in which two coiled linear liquid resistors of two ends of the valve core are used as the feedback liquid resistors of valve core displacement so as to form the full-hydraulic position closed-loop control.
Description
This method relates to a kind of electric-hydraulic proportion control method, is specially adapted to proportion directional valve, proportional flow control valve and proportional pressure valve occasion.
In the existing side valve type proportion directional valve, for following two kinds of methods are adopted in the displacement of controlling spool usually: (1) adopts proportion electro-magnet directly to drive spool, when the power output of proportion electro-magnet and spring force balance, spool displacement is directly proportional with input voltage (or electric current) size of proportion electro-magnet, owing to be open loop control, the power of surging, spring force and the friction force that act on the spool have considerable influence to the displacement of spool, the linearity and precision are all undesirable, require the power output of electromagnet big simultaneously, the quality of electromagnet is also bigger, so the response time is longer.4WRAE10 type proportion directional valve as the production of REXROTH (Li Shile) company.(2) increase a displacement transducer on spool, adopt complicated electricity feedback to constitute position closed loop control, though can overcome the influence to spool displacement of the power of surging and friction force effectively, the linearity and precision are also better, complex structure, price height.4WREE type proportion directional valve as the production of REXROTH (Li Shile) company.In the existing plug-in proportional flow control valve, in order to control the displacement of inserted valve spool, two kinds of methods are also arranged: (1) installs a displacement transducer on the spool of inserted valve, pilot valve still adopts side valve type proportion directional valve, and adopt complicated electricity feedback to constitute the closed loop position control, complex structure, price is expensive, as the 2FRE type operated proportional flow control valve of REXROTH (Li Lile) company production.(2) increase a nonlinear feedback liquid resistance on the spool of inserted valve, pilot valve still adopts side valve type proportion directional valve.Because inserted valve has only a control chamber, is unsymmetric structure, it is bigger that the pressure of control chamber is influenced by oil supply pressure and load pressure, and the linearity and precision are relatively poor, as the DIN24342 type ratio inserted valve of Vickers (Vickers) company.In existing pilot proportional pressure valve, main valve plug does not have position feedback, so pressure overshoot is bigger, and stability and control accuracy are all relatively poor, as DBE (M) the type proportional pressure valve of REXROTH (Li Shile) company production.
Shortcoming at above-mentioned prior art existence, it is pilot valve that task of the present invention provides a kind of employing width modulation high-speed figure valve, form bridge type return with four liquid resistances, and constitute whole electric-hydraulic proportion control method of all-hydraulic position closed loop control as the resistance of spool displacement feedback liquid with two liquid resistance wherein.
The present invention implements by following technical measures, and it is with width modulation (PWM) high-speed figure valve V
1And V
2As pilot valve, adopt four scroll linear restrictor R
1, R
2, R
3And R
4The bridge type return of forming stable symmetry, wherein two of the spool two ends scroll linear restrictor R
3And R
4As the feedback liquid resistance of spool displacement, constitute all-hydraulic position closed loop control, by fine setting scroll linear restrictor R
1And R
2The position adjust the spool zero-bit.
The present invention has the following advantages: the quality of (1) width modulation (PWM) high-speed figure valve electromagnet is little, and response is fast, and power consumption is little, can be directly and computing machine export and be connected.Do not need D/A converter and expensive proportional amplifier.(2) two scroll linear restrictor R at employing spool two ends
3And R
4As the feedback liquid resistance of spool displacement, constitute all-hydraulic position closed loop control.Improved the stationarity of valve core movement greatly, the linearity and control accuracy.And simple in structure, cost is low.(3) the controlled pressure P of two control chambers about
1And P
2Higher, power and the friction force of therefore surging is little to the influence of spool displacement, and spool has very high sensitivity, response speed, zero stability and hydraulic pressure rigidity.The symmetrical bridge type returns that (4) four linear restrictors are formed have offset the influence that oil supply pressure changes, and have eliminated the influence that actuating medium viscosity that temperature change causes changes.(5) by fine setting spool zero adjusting screw, at the zero point that can adjust spool very easily, the spring at two ends automatically resets spool during power failure.(6) scroll linear restrictor and width modulation high-speed figure ball valve are difficult for stopping up, and contamination resistance is strong.(7) adopt four linear restrictors to form the bridge type return of symmetry, and with two liquid resistance wherein as the principles of spool displacement feedback liquid resistance, not only can be used for side valve type proportion directional valve and proportional pressure valve and plug-in proportional flow control valve and proportional pressure valve, and can be used for Manual pressure operation valve and high-speed switch valve, simultaneously, can be used for the hydraulic system that actuating medium is a water.
Description of drawings is as follows:
Accompanying drawing 1 width modulation proportional controlling means fundamental diagram.
It is as follows that the invention will be further described in conjunction with the accompanying drawings:
By the zero point of spool zero adjusting screw resize ratio direction valve.When about two width modulation high-speed figure valve V
1, V
2When being input as zero, the controlled pressure P of two control chambers about spool C
1And P
2Equate: P
1=P
2=0.5P2, P
3Be oil supply pressure.Spool is in zero-bit, and to close high-speed figure valve input usually non-vanishing when two of the right side, the high-speed figure valve V on the left side
2When being input as zero, the pressure P of right side control chamber
1Reduce, spool moves right, and the P mouth communicates with the B mouth, and the A mouth communicates with the T mouth.Spool moves to right and causes liquid resistance R
3Increase and liquid resistance R
4Reduce, thereby make the pressure P of right side control chamber
1The pressure P of increase and left side control chamber
2Reduce.The controlled pressure P of two control chambers when about spool
1And P
2When equating, spool stops at new position, and the displacement of spool is directly proportional with voltage (or electric current) size of input proportion electro-magnet.Input is non-vanishing if the high-speed figure valve is closed on two of the left side usually, and the high-speed figure valve on the right side is input as zero, and in like manner, spool is to left movement, and the P mouth communicates with the A mouth, and the B mouth communicates with the T mouth.Spool moves to left and causes liquid resistance R
4Increase and liquid resistance R
3Reduce, thereby make the pressure P of left side control chamber
2Increase the pressure P of right side control chamber
1Reduce.The controlled pressure P of two control chambers when about spool
2And P
1When equating, spool stops at new position, and the displacement of spool is directly proportional with voltage (or electric current) size of input proportion electro-magnet.
Claims (1)
1. a width modulation proportional controlling means is characterized by with width modulation high-speed figure valve (V
1) and (V
2) as pilot valve, adopt four scroll linear restrictor (R
1), (R
2), (R
3) and (R
4) form and stablize symmetrical bridge type return, wherein two of the spool two ends scroll linear restrictor (R
3) and (R
4) as the feedback liquid resistance of spool displacement, constitute all-hydraulic position closed loop control, by fine setting scroll linear restrictor (R
1) and (R
2) the position, adjust the spool zero-bit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95118949 CN1051601C (en) | 1995-12-06 | 1995-12-06 | PWM proportional control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95118949 CN1051601C (en) | 1995-12-06 | 1995-12-06 | PWM proportional control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1131289A true CN1131289A (en) | 1996-09-18 |
| CN1051601C CN1051601C (en) | 2000-04-19 |
Family
ID=5081826
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95118949 Expired - Fee Related CN1051601C (en) | 1995-12-06 | 1995-12-06 | PWM proportional control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1051601C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101886642A (en) * | 2010-07-26 | 2010-11-17 | 海门市油威力液压工业有限责任公司 | Pilot-operated electrical feedback proportional direction valve |
| CN104819178A (en) * | 2015-03-18 | 2015-08-05 | 北京航空航天大学 | Pressure follow-up servo valve |
-
1995
- 1995-12-06 CN CN 95118949 patent/CN1051601C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101886642A (en) * | 2010-07-26 | 2010-11-17 | 海门市油威力液压工业有限责任公司 | Pilot-operated electrical feedback proportional direction valve |
| CN104819178A (en) * | 2015-03-18 | 2015-08-05 | 北京航空航天大学 | Pressure follow-up servo valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1051601C (en) | 2000-04-19 |
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|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |