SE409602B - FLOW CONTROL DEVICE BETWEEN A SENSOR AND A RECEIVER - Google Patents
FLOW CONTROL DEVICE BETWEEN A SENSOR AND A RECEIVERInfo
- Publication number
- SE409602B SE409602B SE7714476A SE7714476A SE409602B SE 409602 B SE409602 B SE 409602B SE 7714476 A SE7714476 A SE 7714476A SE 7714476 A SE7714476 A SE 7714476A SE 409602 B SE409602 B SE 409602B
- Authority
- SE
- Sweden
- Prior art keywords
- pulse
- sensor
- valves
- pulses
- drain
- Prior art date
Links
- 230000010363 phase shift Effects 0.000 claims description 5
- 230000035484 reaction time Effects 0.000 claims description 5
- 101000931462 Homo sapiens Protein FosB Proteins 0.000 claims 1
- 102100020847 Protein FosB Human genes 0.000 claims 1
- 230000033228 biological regulation Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 230000003828 downregulation Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B9/00—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member
- F15B9/02—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type
- F15B9/08—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by valves affecting the fluid feed or the fluid outlet of the servomotor
- F15B9/09—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by valves affecting the fluid feed or the fluid outlet of the servomotor with electrical control means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/12—Fluid oscillators or pulse generators
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B11/00—Automatic controllers
- G05B11/01—Automatic controllers electric
- G05B11/26—Automatic controllers electric in which the output signal is a pulse-train
- G05B11/28—Automatic controllers electric in which the output signal is a pulse-train using pulse-height modulation; using pulse-width modulation
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Flow Control (AREA)
Description
'10 15 20 25 7714476-4 2 r regleringen av flödet enlig-t uppfinningen sker som ovan nämts genom att variera., överlappningen av ventilernas öppníngsintervaller. The control of the flow according to the invention takes place as mentioned above by varying the overlap of the opening intervals of the valves.
För att utjämna uppladdningen av rörledningen mellan ventilerna 5 och 4 när 3 är öppen och där stängd. ooh på. så sätt lmnna säkra ett nollflöde kan ett strypt avlopp 8 insättas mellan ventilerna. Samtidigt måste en backventil 9 insättas efter ventilen 4 för att undvika. läckage från förbrukaren 1 under ven- tilens 5 stängningsintervaller. ' Ändringen av överlappxzingen mellan ventiler-nas 3, 4 öppningsintervaller sker genom ändring av överlappningsn mellan pulsema från pulsgeneratorerna, varför åtminstone en av dessa, exempelvis 5 som visat, försedd med en regulator 7, till vilken arislutes ett ärvärdje 'från förbrukaren 1 och ett börvärde; ' , .I " 'I I l l De parametrar som framförallt står till buds för att reglera överlappningen mellan pulserna är längden av dessa och deras inbördes fasläge. Den senare möj- ligheten' illustreras i fig 3.To equalize the charging of the pipeline between valves 5 and 4 when 3 is open and closed there. ooh on. In order to ensure a zero flow, a restricted drain 8 can be inserted between the valves. At the same time, a non-return valve 9 must be inserted after the valve 4 to avoid. leakage from the consumer 1 during the closing intervals of the valve 5. The change of the overlap between the opening intervals of the valves 3, 4 takes place by changing the overlap between the pulses from the pulse generators, so that at least one of these, for example 5 as shown, is provided with a regulator 7, to which an actual value setpoint; ', .I "' I I l l The parameters that are primarily available to regulate the overlap between the pulses are the length of these and their mutual phase position. The latter possibility 'is illustrated in Fig. 3.
Den övre raden i fig 5 anger pulserna från generatorn 5, medan den nedre raden anger de från 6. Genom att ändra fasförskjutningen a mellan pulstågen ändras dessas överlappning b. Det framgår att om nedreglerixxg till nollflöde skall vara möjlig måste pauser-na vara åtminstone lika långa som pulserna, varvid även öppnings- och stängningstiderna för ventiler-na måste tas i betraktning.The upper row in Fig. 5 indicates the pulses from generator 5, while the lower row indicates those from 6. By changing the phase shift a between the pulse trains, their overlap b changes. It appears that if downregulation to zero flow is to be possible, the pauses must be at least equal long as the pulses, whereby also the opening and closing times of the valves must be taken into account.
Detta medför att om nollflöde skall kunna. erhållas kan man maximalt uppnå. 50 % öppningstid i systemet. Därvid bör pulsérna. i de två. pulstågen vara lika långa.This means that if zero flow should be able. can be achieved to the maximum. 50% opening time in the system. In doing so, the pulses should. in the two. the pulse trains be the same length.
Eventuellt kan de tvâ. ventilerna styras från sammapulskälla, varvid pulserna till den ena ventilen matas fram över en variabel fasskiftare styrd från regu- latorn 7. d Det är enligt fig 5 utan betydelse vilket av pulstågen som fasförskjutes. För att uppnå. mjuk reglering kan det vidare vara önskvärt att använda hög pulsfrek- vens, dvs korta perioder men periodlängden begränsas nedåt av ventilernas reak- tionstid.Possibly the two can. the valves are controlled from the same pulse source, the pulses to one valve being fed over a variable phase shifter controlled from the regulator 7. d According to Fig. 5, it is irrelevant which of the pulse trains is phase-shifted. To obtain. soft regulation, it may also be desirable to use a high pulse frequency, ie short periods, but the period length is limited downwards by the reaction time of the valves.
Ett annat sätt att uppnå. variabel överlappning framgår av fig 4. I detta fall harpulsérrza- från 6 konstant pulslängd e medan de från 5 har variabel pulslängd d, varvid uppnås variabel överlappziing b. För att även här kunna uppnå. noll- flöds utan att reglera ned pulswngden d till noll måste pulserna. ha. en viss minsta., fast fasförskjutning a', som bland annat bestäms av ventilernas reak- tionstid. Av same. orsak måste den fasta paustiden hos pulstâget från 6 över- 10 15 20 25 '7714476-4 / stiga fasförskjutnizzgen a' med ett visst belopp c. I, detta fall kan fasför- skjutningen a' uppnås genom ett använda ventiler 3, 4 med olika reaktionstid.Another way to achieve. variable overlap is shown in Fig. 4. In this case, pulses emerge from 6 constant pulse length e while those from 5 have variable pulse length d, whereby variable overlap b is achieved. zero flow without regulating the pulse rate d to zero, the pulses must. have. a certain minimum, fixed phase shift a ', which is determined, among other things, by the reaction time of the valves. By the same. For this reason, the fixed pause time of the pulse train must exceed the phase shift a 'by a certain amount c. In this case, the phase shift a' can be achieved by using valves 3, 4 with different reaction time.
För att få mjuk reglering är det praktiskt att hålla pauslängden c + a' så kort som möjligt, dvs så kort som ventilernas reaktionstid tillåter. För att möjliggöra hög öppningsgrad är det å andra sidan önskvärt att göra pulslängden c hos pulserna från 6 lång i förhållande till paustiden. Längden uppåt begrän- sas dock av önskan om mjuk reglering så att ett förhållande på 1:4 kan vara en lämplig kompromiss motsvarande en öppningsgrad på 80 %.In order to obtain soft regulation, it is practical to keep the pause length c + a 'as short as possible, ie as short as the reaction time of the valves allows. On the other hand, in order to enable a high degree of aperture, it is desirable to make the pulse length c of the pulses from 6 long in relation to the pause time. The length upwards is, however, limited by the desire for soft regulation so that a ratio of 1: 4 can be a suitable compromise corresponding to an opening degree of 80%.
Medan det enligt fig 3 inte spelar någon större roll vilken ventil man reglerar är det enligt fig 4 mest praktiskt att reglera på ventilen 3 för att hålla läckaget över dränaget 8 så lågt som möjligt i synnerhet vid hög nedstyrning av systemet. I 'I in I båda fallen måste pulsfrekvensen vara exakt densamma., varför det kan vara. _ praktiskt som ovan nämnts att använda sn gemensam pulsgivare och ansluta denna till ventilerna över fasförskjutande och pulslängdsbestämnazule organ.While according to Fig. 3 it does not matter much which valve is regulated, according to Fig. 4 it is most practical to regulate the valve 3 to keep the leakage over the drain 8 as low as possible, especially in case of high control of the system. In both cases the pulse rate must be exactly the same, which is why it can be. practical as mentioned above to use a common encoder and connect it to the valves over phase shifting and pulse length determining means.
Fig 2 visar systemet enligt uppfinningen tillämpat för ett tvåvägssystem, exem- pelvis för styrning av en servomotor 1'.Fig. 2 shows the system according to the invention applied to a two-way system, for example for controlling a servomotor 1 '.
Tillflödesvägen är som enligt fig 1, medan returloppet sker över en backventil 12 ooh två. magrzetventiler 10 och 11 som leder till avloppet 15. I detta fall förhindras en uppladdning av förbindelsen mellan 10 och 11 då 10 är stängd och 11 öppen medelst en strypt förbindelse 15 till pumpen 2.The supply path is as according to Fig. 1, while the return flow takes place via a non-return valve 12 and two. solenoid valves 10 and 11 leading to the drain 15. In this case, charging of the connection between 10 and 11 is prevented when 10 is closed and 11 is opened by means of a restricted connection 15 to the pump 2.
Vid styrning av fig 2 enligt principen i fig 4 bör för begränsning av dränaget den nedströms ventilen, dvs 10, vara reglerad, medan 11 arbetar med fasta pulser.When controlling Fig. 2 according to the principle in Fig. 4, in order to limit the drainage, the downstream valve, ie 10, should be regulated, while 11 operates with fixed pulses.
Servomotorn 1' innehåller en kolv som medelst flödet över ventilerna 3, 4 pressas upp mot en fjäder och avlastas över ventilerna. 10, 111. Regulatorema för dessa fyra ventiler styrs exempelvis i beroende av kolvens läge eller någon annan parameter som är påverkad av servomotorn. För snabb avlastning av servo- motorn kan ventilen 14 vara insatt.The servomotor 1 'contains a piston which by means of the flow over the valves 3, 4 is pressed up against a spring and is relieved over the valves. 10, 111. The controllers for these four valves are controlled, for example, depending on the position of the piston or some other parameter which is influenced by the servomotor. For quick relief of the servomotor, the valve 14 can be inserted.
Claims (1)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE7714476A SE409602B (en) | 1977-12-20 | 1977-12-20 | FLOW CONTROL DEVICE BETWEEN A SENSOR AND A RECEIVER |
JP15361578A JPS5490475A (en) | 1977-12-20 | 1978-12-12 | Control device for flow system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE7714476A SE409602B (en) | 1977-12-20 | 1977-12-20 | FLOW CONTROL DEVICE BETWEEN A SENSOR AND A RECEIVER |
Publications (2)
Publication Number | Publication Date |
---|---|
SE7714476L SE7714476L (en) | 1979-06-21 |
SE409602B true SE409602B (en) | 1979-08-27 |
Family
ID=20333256
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE7714476A SE409602B (en) | 1977-12-20 | 1977-12-20 | FLOW CONTROL DEVICE BETWEEN A SENSOR AND A RECEIVER |
Country Status (2)
Country | Link |
---|---|
JP (1) | JPS5490475A (en) |
SE (1) | SE409602B (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61116107A (en) * | 1984-11-09 | 1986-06-03 | Hitachi Ltd | Actuator controller |
-
1977
- 1977-12-20 SE SE7714476A patent/SE409602B/en unknown
-
1978
- 1978-12-12 JP JP15361578A patent/JPS5490475A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
JPS5490475A (en) | 1979-07-18 |
SE7714476L (en) | 1979-06-21 |
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