EP3207254B1 - Système et procédé de commande pour commander une pompe volumétrique - Google Patents

Système et procédé de commande pour commander une pompe volumétrique Download PDF

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Publication number
EP3207254B1
EP3207254B1 EP15775819.4A EP15775819A EP3207254B1 EP 3207254 B1 EP3207254 B1 EP 3207254B1 EP 15775819 A EP15775819 A EP 15775819A EP 3207254 B1 EP3207254 B1 EP 3207254B1
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EP
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Prior art keywords
fluid
configuration
thrust chamber
pump
control means
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EP15775819.4A
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German (de)
English (en)
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EP3207254A1 (fr
Inventor
Leonardo Cadeddu
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VHIT SpA
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VHIT SpA
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/18—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber
    • F04C14/22—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members
    • F04C14/223—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members using a movable cam
    • F04C14/226—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members using a movable cam by pivoting the cam around an eccentric axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C2/34—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
    • F04C2/344—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member

Definitions

  • the object of the present invention is a control system and method for controlling a variable volume positive displacement rotary pump.
  • variable displacement pumps for circulation of the lubrication oil in an internal combustion engine and any possible auxiliaries.
  • Variable displacement makes it possible to regulate the flow rate of the lubrication oil, optimizing it based on the operating mode of the engine.
  • the flow rate should be such as to ensure adequate lubrication at low speeds, but this would determine an excessive flow rate at higher speeds (therefore requiring greater consumption by the engine to ensure circulation of the lubricant and imposing higher pressures and thus greater stress on the circuit).
  • variable displacement pump for circulation of lubrication oil
  • two chambers are shown that move a stator, inside of which a vane rotor rotates.
  • the movement of the stator determines a variation in the output of the pump.
  • Access to at least one of the two thrust chambers is regulated by a valve controlled by an electronic control unit.
  • the two thrust chambers act jointly to counter the force exerted by a spring.
  • the spring exerts a force that pushes the stator to a position of maximum displacement.
  • variable displacement pump A further example of a variable displacement pump is disclosed in document US 2014/0219847 A1 .
  • variable displacement pump when utilized on mid-range/high-powered engines for heavy vehicles there is a problem consisting of a marked delay in the increase in flow rate/pressure of the oil needed for quickly activating the actuator of the engine brake and for protecting the internal members of the engine from stress.
  • the technical task underlying the present invention is to offer a control system and method for controlling a pump that make it possible to overcome the drawbacks described hereinabove.
  • an aim of the present invention is to offer a control system and method for controlling a pump that make better lubrication of a load possible, regardless of the operating conditions.
  • control system for controlling a positive displacement pump is indicated by the reference number 1.
  • This system comprises the positive displacement pump 2, which is of the variable volume rotary type.
  • variable displacement makes it possible to optimize operation under different operating conditions.
  • the pump 2 comprises a stator 20 that is movable so as to determine a variation in the volume of the pump 2.
  • the stator 20 is conveniently hollow and a rotor 200, typically a vane rotor, is present inside the stator. Relative movement of the stator 20 with respect to the axis of rotation of the rotor 200 allows for variation in the volume of the pump 2.Movement of the stator 20 can be of various types, for example it could be a tilting, rotational, or translational type of movement.
  • the movement of the stator 20 is of the rotational type where a first, a second and a third arc are indicated by reference numbers 203, 204, 205, with a common centre, on which the stator 20 rotates.
  • the pump 2 further comprises a first thrust chamber 214 for thrusting the stator 20.
  • This first thrust chamber 21 is designed to be filled with a fluid processed by the pump. In this manner, it is possible to bring about movement of the stator 20 and a variation in the volume of the pump 2.
  • the fluid processed by the pump 2 is a liquid, typically oil. Therefore, this fluid is not compressible.
  • the first chamber 21 is defined by the fluid dynamic seal realized with the contribution of the third arc 205, the first arc 203 and the gasket 201.
  • the system 1 comprises a supply line 3 for supplying the fluid processed by the pump 2 to a load.
  • the load is generally indicated by the reference letter "C", for example the lubrication system of an endothermic engine.
  • the supply line 3 extends downstream of a delivery side of the pump 2; it preferably starts precisely from the delivery side of the pump 2.
  • the system 1 conveniently comprises an element 4 that defines a localized pressure drop.
  • This element 4 is located along the supply line 3. It is located before the load.
  • the element 4 that defines a localized pressure drop advantageously consists in a filter 40 for the fluid in transit in said supply line 3.
  • the filter 40 determines a pressure drop that can amount to as much as 2-3 bars, based on temperature, flow rate and blockage.
  • the filter 40 lies along the supply line 3.
  • the element 4 could also consist in a component of another type that determines an abrupt localized type of pressure loss.
  • the system 1 also comprises control means 5 for controlling the flow of the fluid supplying said first chamber 21.
  • control means 5 is able to assume at least a first and a second configuration.
  • the system 1 further comprises a first branch 31, which, in the first configuration of the control means 5, allows for collecting the fluid (pressure) to be directed into the first thrust chamber 21, from said supply line 3 downstream of said element 4 (see Figure 1 ).
  • the system 1 further comprises a second branch 32, which, in the second configuration of the control means 5, allows for collecting the fluid (pressure) to be directed into the first thrust chamber 21, from said supply line 3 upstream of said element 4 (see Figure 2 ).
  • a second branch 32 which, in the second configuration of the control means 5, allows for collecting the fluid (pressure) to be directed into the first thrust chamber 21, from said supply line 3 upstream of said element 4 (see Figure 2 ).
  • the contour of the stator 20 is illustrated in the schematic view of Figure 1 and the rotor 200 is visible only in Figure 2 .
  • the second configuration enables a more demanding functioning of the load (for example this can involve operating conditions in which the engine brake is activated or mid-range/high-powered engines are operating on heavy vehicles).
  • the second branch 32 is conveniently connected to a maximum pressure safety valve 511. In the case of excess pressure, this valve 511 enables the fluid to be discharged into a collection system (which is, in turn, operatively connected to the suction of the pump 2).
  • control means 5 conveniently enables passage of the fluid from said first branch 31 towards the first thrust chamber 21, blocking passage of the fluid from said second branch 32 towards the first thrust chamber 21.
  • the movement of the fluid in the first configuration of the control means is illustrated in Figure 1 .
  • control means 5 In the second configuration ( Figure 2 ), the control means 5 enables passage of the fluid from said second branch 32 towards the first thrust chamber 21, blocking passage of the fluid from said first branch 31 towards the first thrust chamber 21.
  • the movement of the fluid in the second configuration of the control means is illustrated in Figure 2 .
  • the control means 5 for controlling the flow of the fluid comprises a three-way valve 50 that alternatively has the first or second branch 31, 32 as inlets.
  • This three-way valve 50 is typically responsible for the occurrence of the first or second configuration of the control means 5.
  • the system 1 conveniently comprises an electronic control unit 6 for commanding the flow control means 5, said electronic control unit 6 determining the switching between the first and the second configuration.
  • the control means 5 for controlling the flow comprises a modulating valve 51 for modulating the entrance of fluid into the first thrust chamber 21.
  • the valve 51 could consist of a spool valve.
  • the outlet of said three-way valve 50 supplies the inlet of the spool valve.
  • the modulating valve 51 (the spool valve) comprises piston that moves in a compartment. In a first position of the piston, the modulating valve 51 enables the first chamber 21 to be filled. In a second position of the piston, the regulating valve enables the first chamber 21 to be emptied. Conveniently, in the second position of the piston, the fluid present in the first chamber 21 is re-directed towards the suction of the pump 2.
  • the modulating valve 51 is controlled by the electronic control unit 6.
  • the system 1 conveniently comprises a second thrust chamber 22.
  • the second chamber 22 is found (is supplied) downstream of said element 4, with respect to the direction of travel of the fluid in the supply line 3.
  • the second thrust chamber 22 is supplied by a third branch 33 located downstream of said element 4.
  • the third branch 33 conveniently extends from the supply line 3.
  • the third branch 33 extends upstream of the load C that is supplied by the line 3.
  • the fluid present in the second thrust chamber 22 exerts an opposite thrust on the stator 20 with respect to the fluid present in the first thrust chamber 21.
  • the pump 2 comprises elastic means 23 that exerts an action jointly with the fluid present in the first thrust chamber 21 so as to position the stator 20 in the maximum volume configuration.
  • the elastic means 23 comprises for example a compression spring. Leaving the condition of maximum volume, the spring is compressed. In this manner, even in the case where there is a breakdown in the electronics management of the control system of the pump 2, the latter progresses towards a situation of maximum volume, minimizing the risk of "seizing".
  • the third branch 33 conveniently keeps the second chamber 22 pressurized.
  • the second chamber 22 is defined by the fluid dynamic sealing realized with the contribution of the third arc 205, the second arc 204 and the gasket 202.
  • the object of the present invention is also a method for controlling the operation of a variable volume positive displacement rotary pump.
  • the control method is conveniently implemented by a control system 1 that has one or more of the characteristics described hereinabove.
  • the method of operation of the system 1 shall thus be illustrated by way of example below.
  • the method comprises the stage of conveying a fluid exiting from the delivery side 24 of the pump 2 along a supply line 3 for supplying a load C, having it pass through at least one filter 40.
  • the load C typically comprises a lubrication system for an internal combustion engine.
  • This filter 40 determines a drop in pressure that can amount to as much as 2-3 bars.
  • the method further comprises the stage of positioning the control means 5 for controlling the flow of fluid in a first configuration in such a manner as to collect part of the fluid in transit along said supply line 3, downstream of the filter 40, and convey it into a first thrust chamber 21 for thrusting a stator 20 (see Figure 1 ).
  • the stage of positioning the control means 5 for controlling the flow of fluid in a first configuration comprises positioning a three-way valve 50 so that part of the fluid in transit along said supply line 3 is collected downstream of the filter 40 ( Figure 1 ).
  • the stage of positioning the control means 5 in the first configuration further comprises having the fluid exiting the three-way valve 50 pass through a spool valve 51 that regulates/modulates access of the fluid into the first chamber 21.
  • the method conveniently comprises the stage of conveying part of the fluid that has passed from the delivery side of the pump 2 into a second chamber 22.
  • the pressure exerted on the stator 20 by the fluid in the first chamber 21 is opposite the pressure exerted on the stator 20 by the fluid present in the second chamber 22.
  • the method comprises exerting, by means of the elastic means 23, a force on the stator 20 that opposes the distancing of the stator 20 from a position associated with the maximum volume of the pump 2.
  • the position of the stator 20 is conveniently defined by the equilibrium at least of the following stresses:
  • the pressure exerted on the stator 20 by the fluid present in the first chamber 21 is opposite the force exerted on the stator 20 by the elastic means 23.
  • the method further comprises the stage of changing the configuration of the flow control means 5 so as to pass from the first configuration to a second configuration. Passage from the first to the second configuration is associated with a configuration for more demanding functioning (for example, but not necessarily, frequent recourse to the engine brake). Conveniently, passage from the first to the second configuration is determined by a command coming from an electronic control unit based on the detection of certain input signals (for example through sensors or an explicit user command).
  • the method comprises the stage of collecting a working fluid between the delivery side 24 of the pump 2 and the filter 40 and directing it to the first thrust chamber 21 (see Figure 2 ).
  • the passage from the first to the second configuration determines a movement of the stator 20 accompanied by a rapid increase in the volume of the pump 2.
  • the pressure that is available and that can be modulated for said first chamber 21 is higher than in the first configuration.
  • the stage of changing the configuration of the control means 5 so as to pass from the first to the second configuration advantageously comprises changing the configuration of the three-way valve 50 so that a fluid passes through it, the fluid being the fluid that is collected from the supply line 3 supplying the load downstream of the delivery side of the pump 2, but before the filter 40.
  • stator 20 can progress towards a position with which the maximum volume of the pump 2 is associated, thus ensuring a greater fluid flow rate so as to meet more demanding functioning needs.
  • the latter can exert greater pressure with respect to the second thrust chamber (and this makes the passage of the stator into the maximum volume configuration faster, preventing, among other things, vibrations or undesired reactions).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)

Claims (10)

  1. Système de commande, comprenant :
    - une pompe rotative volumétrique à volume variable (2), comprenant à son tour :
    i) un stator (20) qui est mobile afin de déterminer une variation du volume de la pompe (2) ;
    ii) une première chambre de poussée (21) pour pousser le stator (20) et conçue pour être remplie avec un fluide traité par la pompe afin de déterminer un mouvement du stator (20) et une variation du volume de la pompe (2) ;
    - une conduite d'alimentation (3) pour effectuer l'alimentation en le fluide traité par la pompe (2) à une charge ;
    - un élément (4) qui définit une chute de pression localisée, ledit élément (4) étant situé le long de ladite conduite d'alimentation (3) ;
    - un moyen de commande (5) pour commander l'écoulement du fluide alimentant ladite première chambre (21), ledit moyen de commande (5) étant capable d'adopter au moins une première et une seconde configuration ;
    - une première branche (31), qui, dans la première configuration du moyen de commande (5), permet de diriger le fluide, collecté à partir de ladite conduite d'alimentation (3) en aval dudit élément (4), dans la première chambre de poussée (21) ;
    - une seconde branche (32), qui, dans la seconde configuration du moyen de commande (5), permet de diriger le fluide, collecté à partir de ladite conduite d'alimentation (3) en amont dudit élément (4), dans la première chambre de poussée (21) ; par rapport à la première configuration, ladite seconde configuration permettant le fonctionnement de la charge dans des conditions plus contraignantes.
  2. Système selon la revendication 1, caractérisé en ce que ledit élément (4) qui définit une chute de pression localisée est constitué en un filtre (40) pour le fluide en transit dans ladite conduite d'alimentation (3).
  3. Système selon la revendication 1 ou 2, caractérisé en ce que le moyen de commande (5) :
    - dans la première configuration, permet le passage du fluide à partir de ladite première branche (31) vers la première chambre de poussée (21), bloquant le passage du fluide à partir de ladite seconde branche (32) vers la première chambre de poussée (21) ;
    - dans la seconde configuration, permet le passage du fluide à partir de ladite seconde branche (32) vers la première chambre de poussée (21), bloquant le passage du fluide à partir de ladite première branche (31) vers la première chambre de poussée (21).
  4. Système selon l'une quelconque des revendications précédentes, caractérisé en ce que ledit moyen de commande (5) pour commander l'écoulement du fluide comprend une valve à trois voies (50) qui a de façon alternée la première ou seconde branche (31, 32) en tant qu'entrées.
  5. Système selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comprend une unité de commande électronique (6) pour commander le moyen de commande d'écoulement (5), ladite unité de commande électronique (6) déterminant la permutation entre la première et la seconde configuration.
  6. Système selon la revendication 5, caractérisé en ce que le moyen de commande (5) pour commander l'écoulement comprend une valve de modulation (51) pour moduler l'introduction de fluide dans la première chambre de poussée (21), et qui est commandée par l'unité de commande électronique (6).
  7. Système selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comprend une seconde chambre de poussée (22) ; dans la première ainsi que dans la seconde configuration du moyen de commande (5), ladite seconde chambre de poussée (22) étant en aval dudit élément (4), par rapport à la direction de déplacement du fluide dans la conduite d'alimentation (3).
  8. Système selon l'une quelconque des revendications précédentes, caractérisé en ce que le fluide présent dans la seconde chambre de poussée (22) exerce une poussée opposée par rapport au fluide présent dans la première chambre de poussée (21) ; ladite pompe (2) comprenant un moyen élastique (23) qui exerce une action conjointement avec le fluide présent dans la première chambre de poussée (21) afin de positionner le stator (20) dans la configuration de volume maximum.
  9. Procédé pour commander le fonctionnement d'une pompe rotative volumétrique à volume variable, comprenant les stades de :
    - le transport d'un fluide sortant du côté refoulement (24) de la pompe (2) le long d'une conduite d'alimentation (3) pour alimenter une charge, faisant en sorte que ledit fluide passe à travers au moins un filtre (40) ;
    - le positionnement du moyen de commande (5) pour commander l'écoulement de fluide dans une première configuration de manière telle à collecter, en aval du filtre (40), une partie du fluide en transit le long de ladite conduite d'alimentation (3) et le transporter dans une première chambre de poussée (21) pour pousser un stator (20) ;
    - le changement de la configuration du moyen de commande (5) pour commander l'écoulement du fluide afin de passer de la première configuration à une seconde configuration afin de permettre la collection d'un fluide actif entre le coté refoulement (24) de la pompe (2) et le filtre (40) et le diriger dans la première chambre de poussée (21), ceci déterminant un mouvement du stator (20), accompagné par une augmentation du volume de la pompe (2), et par rapport à la première configuration, ladite seconde configuration permettant un fonctionnement plus contraignant de la charge.
  10. Procédé selon la revendication 9, caractérisé en ce qu'au moins dans la première configuration du moyen de commande (5), une seconde chambre de poussée (22) exerçant une pression sur le stator (20) qui est opposée à la pression de la première chambre de poussée (21) est prévue en aval dudit filtre (40).
EP15775819.4A 2014-10-15 2015-09-17 Système et procédé de commande pour commander une pompe volumétrique Active EP3207254B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPR20140069 2014-10-15
PCT/IB2015/057147 WO2016059490A1 (fr) 2014-10-15 2015-09-17 Système et procédé de commande pour commander une pompe volumétrique

Publications (2)

Publication Number Publication Date
EP3207254A1 EP3207254A1 (fr) 2017-08-23
EP3207254B1 true EP3207254B1 (fr) 2021-04-21

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WO (1) WO2016059490A1 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10138187B4 (de) * 2001-07-27 2013-03-14 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Mengenregelbare Flügelzellenpumpe
ITBO20030528A1 (it) * 2003-09-12 2005-03-13 Pierburg Spa Impianto di pompaggio utilizzante una pompa a palette
EP1979616B1 (fr) 2006-01-31 2015-12-23 Magna Powertrain Inc. Systeme de pompe a palettes a cylindree variable et a pression variable
US9133738B2 (en) * 2010-11-24 2015-09-15 Pierburg Pump Technology Gmbh Variable displacement lubricant pump
JP6004919B2 (ja) * 2012-11-27 2016-10-12 日立オートモティブシステムズ株式会社 可変容量形オイルポンプ

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
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EP3207254A1 (fr) 2017-08-23
WO2016059490A1 (fr) 2016-04-21

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