WO2015052739A1 - Actionneur électromécanique pour soupapes de machines et système de commande électronique équipé dudit actionneur - Google Patents

Actionneur électromécanique pour soupapes de machines et système de commande électronique équipé dudit actionneur Download PDF

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Publication number
WO2015052739A1
WO2015052739A1 PCT/IT2014/000258 IT2014000258W WO2015052739A1 WO 2015052739 A1 WO2015052739 A1 WO 2015052739A1 IT 2014000258 W IT2014000258 W IT 2014000258W WO 2015052739 A1 WO2015052739 A1 WO 2015052739A1
Authority
WO
WIPO (PCT)
Prior art keywords
actuator
valves
ball
propulsors
engine
Prior art date
Application number
PCT/IT2014/000258
Other languages
English (en)
Inventor
Andrea Barbaro
Carlo GIACONE
Fabio PASSARELLI
Eraldo RAVELLO
Original Assignee
Andrea Barbaro
Giacone Carlo
Passarelli Fabio
Ravello Eraldo
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Andrea Barbaro, Giacone Carlo, Passarelli Fabio, Ravello Eraldo filed Critical Andrea Barbaro
Publication of WO2015052739A1 publication Critical patent/WO2015052739A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/46—Component parts, details, or accessories, not provided for in preceding subgroups
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
    • F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric means

Definitions

  • the present invention refers to an electromechanical actuator for machine valves and to an electronic control system equipped with such actuator.
  • the most widespreaded operating fluid system is the internal combustion engine (MCI), and it is defined as thermal driving machine which allows converting the chemical energy, owned by an air- fuel mixture, into a mechanical work available onto the shaft.
  • MCI internal combustion engine
  • the conversion occurs in the combustion chamber, where burnt gases push the piston downwards, while this latter one, in turn, rotates the drive shaft.
  • the mixture consists in a fuel which can be gasoline, diesel oil, GPL or other petrol derivatives (or other mixtures such as alcohol or colza or others), while air oxygen operates as comburent.
  • the type of fuel determines the engine characteristics and therefore its application in the various fields.
  • the class of internal combustion engines comprises a wide variety of different types.
  • volumetric engines wherein engine fluid is periodically processed inside a well defined volume and cyclically generated by the motion of some mechanical members
  • this latter type of engine is therefore like a mechanical energetic outflow system.
  • thermo-dynamic cycle type Reciprocating engines are divided, depending on the thermo-dynamic cycle type, into:
  • the four-stroke reciprocating volumetric engine is the type of engine which provides mechanical energy to almost all rubber-type transport means, to motor boats (excluding ships which use the supercharged two-stroke engine) and some trains. It is also used on small propeller- type airplanes and to produce low-voltage electric energy.
  • the volumetric engine in order to operate, needs several members: the proposed system intervenes on distribution mmebers, which are those allowing to move the valves.
  • the invention in fact deals with an innovative system, applied to operating fluid machines, for controlling the movements of valves and for inlet and discharge in and from the combustion chamber, applied to one or more cylinders.
  • the opening and closing control of the valves of a machine with operating fluid is provided by the camshaft stiffly connected to the drive shaft: transforming rotary movement into axial movement determines its Lift/Rest/Closing stroke in a timed but fixed way, depending on engine revolutions.
  • valves were directly controlled, always depending on engine pulses, but not stiffly interconnected, modularity could then be obtained.
  • This direct control would allow a quicker, safe, reliable, flexible and non-hysteresis control of actuating times (Lift/Rest/Closure) , optimizing engine performances.
  • valve controlling systems for internal combustion engines an important aspect of the actual suction and exhaust operation, present in every engine, is managing valve spark advances. It is easy to imagine how any action does not perfectly istantaneously occur, but that instead a certain time, even short but not null, is required.
  • valve movements occur in a time which is comparable with about one operating phace, namely (referred to a four-stroke internal combustion engine) in a quarter of a cycle.
  • the above opening advance/closing delay however means that, for example in the first part of the compression, the suction valve is still open (with the risk that part of the fuel-comburent mixture is pushed outside instead of being compressed) or that, in the last expansion phase before explosion, part of the thrust gets lost (due to burnt gases which go out of the exhaust valve which is opening) .
  • Object of the present invention is solving the above prior art problems, by providing an electromechanical actuator which, being externally controlled, allows more actuation and control flexibility for the valve stroke movements (Lift/Rest/Closure) in a direct way, without the help of systems which are stiffly connected to the engine (such as camshaft, pulleys, belts, etc.).
  • Another object of the present invention is providing an electronic control system equipped with the above described actuator.
  • FIG. 1 is a functional block diagram of a system which uses an actuator according to the present invention
  • FIG. 2 is a side sectional view of a first preferred embodiment of the actuator of the present invention
  • FIG. 3 is a side sectional view of a second preferred embodiment of the actuator of the present invention.
  • FIG. 4 is a side sectional view of a comparison between a prior art actuator and an actuator of the present invention.
  • FIG. 1 shows a functional diagram of the electro-mechanical system EVA to which the present invention is applied.
  • reference numbers designate: 1 a control drive of the propulsors, 2 a data processing unit (ECU) , 3 a plurality of auxiliary propulsors, 4 a corresponding plurality of actuators, 5 a continuous detector of the position of the drive shaft, and 6 a corresponding plurality of valves, coupled and operatively connected to the actuators 4 controlled by the propulsors 3.
  • ECU data processing unit
  • Handling and stroke of valves 6 are performed by an actuator 4 which in turn is externally controlled and driven, but not mechanically constrained, by the drive shaft (not shown) .
  • control and handling of the valve 6 are obtained by transforming the rotary movement (provided by an auxiliary propulsor 3) into a translating movement of the valves through a precision, coaxial joining system composed of a mobile coupling between the valve 6 itself and any mechanical device (which will be shown below) adapted to perform an axial displacement (such parts are the actuator 4) .
  • the auxiliary propulsor 3 placed in control of any mechanical device adapted to perform an axial movement, with its own position sensor, allows such performances as to obtain a response time with immediate control, without hysteresis and with reduced strokes (due to the provided accuracy) . It is electronically driven by a drive 1 which, in real time, transmits the necessary current for its handling.
  • a data processing unit (or ECU) 2 depending both on signals received by the continous detector 5 of the position of the drive shaft, and on data supplied by the various sensors and on engine conditions (load), sends a command to the drive 1 for suitably managing the single propulsors 3.
  • Every command processed by the ECU 2 is defined by a dedicated software, optimized depending on the actual needs expressed by operating and environemtal conditions of the engine, in addition to different regulating conditions of the valves 6 (stroke, operating powers, times and phasing, etc.).
  • Figure 2 shows a first preferred, but absolutely not limiting, embodiment of the electromechanical actuator 4 of the present invention and of its related mechanical components.
  • Figure 2 shows an electro-mechanical actuator 4, with fixed coupling element, for controlling movements of the valve 6.
  • the actuator further comprises a coupling element 7 of any device 10 switching the rotary movement into translating movement, which is constrained by rotation-preventing sliders and/or bearings 8, which therefore allow only its translating movement.
  • the locking ring nut 11 In its lower part, the locking ring nut 11, with its related NP half-cones 12, blocks the valve NP 6.
  • the actuator 4 is fastened to the engine overhead through a blocking system 9.
  • Figure 2 shows an actuator 4 with fixed coupling element (for example a ball- recirculation nut screw) , comprising an auxiliary propulsor 3, a valve NP 6, a coupling element 7 of any mechanical device switching the rotary movement into translating movement (for example a ball- recirculation nut screw) , sliders/bearings 8 for preventing the rotation of the nut screw 7, a blocking system 9, a mechanical device 10 switching the rotary movement into translating movement (for example a ball-recirculation nut) , a ring nut 11 for blocking the valve 6, NP half-cones 12 and a shaft 14 of the propulsor 3.
  • Reference number 13 then designates the maximum stroke, which can be optimized, of the inventive actuator 4.
  • FIG 3 instead, shows another preferred embodiment of the inventive electro-mechanical actuator 4.
  • the shaft 14 of the propulsor 3, completed with position detector, is stiffly keyed-in to a coupling element (for example a rotary ball- recirculation nut screw) 7 of any mechanical device (for example a ball-recirculation nut) 10 switching the translating movement into rotary movement.
  • the propulsor 3 is fastened through a blocking system 9.
  • the coupling element 7 is further constrained to the valve over-head 16 by thrust bearings 17, through the locking ring nut 15, in which such thrust bearings 17 allow only its rotation.
  • the mechanical device 10 switching the rotary movement into translating movement is directly obtained onto the stem of the valve 6.
  • the rotation-preventing bearings 18, which allow only translating movements, are fastenend onto the stem of the valve 6, and are opposed by the rotation preventing sliders/contrast bearings 19.
  • Figure 3 also shows, with reference number 13, the maximum stroke, which can be optimized, obtained by the inventive actuator 4.
  • Figure 4 finally shows a comparison between a traditional mechanical control S2 and the electromechanical arrangement SI proposed for operating/handling the valves 6 in an engine with operating fluid, such as an internal combustion engine, keeping part of the NP components.
  • the electro-mechanical system S2 EVA of the invention includes:
  • the control system for a suitable handling of the single propulsors 3 connected through the actuators 4 to the valves 6, provides for a continuous detector 5 of the position of the drive shaft, which sends a signal to the ECU 2, which (depending on the conditions of the sensors and the conditions of the engine or load) respectively allows :
  • the arrangement allows a reduction of mechanical moving parts (the replacement of the camshaft and of the related mechanical connections is pointed out) , due to the adoption of a system equipped with any mechanical device switching the rotary movement into translating movement and fixed or rotary coupling element .
  • the actuator system composed of any mechanical device 4 switching the rotary movement into translating movement, set in an axial-rotary movement, by coupling to the auxiliary propulsor 3 (with its own position sensor) , allows obtaining high performances.
  • the engine working conditions (cycle phases) are sent to the ECU 2 through a continuous positioning sensor 5, coupled with the usual parameter-detecting sensors.
  • the ECU 2 managed by a software, therefore transmits a control/drive signal, which determines and communicates in real time the necessary control signal for Lift/Rest/Closure movements of the valve 6 through the auxiliary propulsor 3.
  • the presented system allows:

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

L'invention concerne un actionneur électromécanique (4) pour des soupapes (6) de machines à fluide de travail actionnées par des propulseurs (3) comprenant: des moyens de commutation (10) d'un mouvement de rotation des propulseurs (3) en un mouvement de translation des soupapes (6); et des moyens d'accouplement (7) des moyens de commutation (10) à l'actionneur (4). L'invention concerne également un système de commande électronique équipé dudit actionneur (4).
PCT/IT2014/000258 2013-10-09 2014-09-29 Actionneur électromécanique pour soupapes de machines et système de commande électronique équipé dudit actionneur WO2015052739A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000815A ITTO20130815A1 (it) 2013-10-09 2013-10-09 Attuatore elettromeccanico per valvole di macchine e sistema elettronico di controllo dotato di tale attuatore
ITTO2013A000815 2013-10-09

Publications (1)

Publication Number Publication Date
WO2015052739A1 true WO2015052739A1 (fr) 2015-04-16

Family

ID=49596398

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT2014/000258 WO2015052739A1 (fr) 2013-10-09 2014-09-29 Actionneur électromécanique pour soupapes de machines et système de commande électronique équipé dudit actionneur

Country Status (2)

Country Link
IT (1) ITTO20130815A1 (fr)
WO (1) WO2015052739A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB963698A (en) * 1960-02-19 1964-07-15 Foxboro Yoxall Ltd Actuators for positioning a fluid flow control valve or other member in accordance with an electrical signal
US3856042A (en) * 1973-06-21 1974-12-24 Nasa Combined pressure regulator and shutoff valve
GB2009844A (en) * 1977-12-08 1979-06-20 Maschf Augsburg Nuernberg Ag Apparatus for controllably operating valves
US20020069841A1 (en) * 2000-12-07 2002-06-13 Miller John Michael Electromechanical valve assembly for an internal combustion engine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB963698A (en) * 1960-02-19 1964-07-15 Foxboro Yoxall Ltd Actuators for positioning a fluid flow control valve or other member in accordance with an electrical signal
US3856042A (en) * 1973-06-21 1974-12-24 Nasa Combined pressure regulator and shutoff valve
GB2009844A (en) * 1977-12-08 1979-06-20 Maschf Augsburg Nuernberg Ag Apparatus for controllably operating valves
US20020069841A1 (en) * 2000-12-07 2002-06-13 Miller John Michael Electromechanical valve assembly for an internal combustion engine

Also Published As

Publication number Publication date
ITTO20130815A1 (it) 2014-01-08

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