Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02D—CONTROLLING COMBUSTION ENGINES
  • F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
  • F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
  • F02D13/0253—Fully variable control of valve lift and timing using camless actuation systems such as hydraulic, pneumatic or electromagnetic actuators, e.g. solenoid valves
• • 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
• • 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
  • F01L9/21—Valve-gear or valve arrangements actuated non-mechanically by electric means actuated by solenoids
  • F01L2009/2132—Biasing means
  • F01L2009/2134—Helical springs
  • F01L2009/2136—Two opposed springs for intermediate resting position of the armature
• • 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
  • F01L9/21—Valve-gear or valve arrangements actuated non-mechanically by electric means actuated by solenoids
  • F01L2009/2167—Sensing means
  • F01L2009/2169—Position sensors
• • 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
  • F01L9/40—Methods of operation thereof; Control of valve actuation, e.g. duration or lift
  • F01L2009/4086—Soft landing, e.g. applying braking current; Levitation of armature close to core surface
• • 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
  • F01L9/40—Methods of operation thereof; Control of valve actuation, e.g. duration or lift
  • F01L2009/409—Determination of valve speed
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
  • Y02T10/00—Road transport of goods or passengers
  • Y02T10/10—Internal combustion engine [ICE] based vehicles
  • Y02T10/12—Improving ICE efficiencies

Definitions

• the present invention relates to a device and a method for controlling a valve such as a valve of a heat engine that can be used to move a motor vehicle. .
• a valve control device is arranged to move said valve between an open position and a closed position to allow, depending on whether the valve is an intake valve or an exhaust valve, either the admission of fuel into a combustion chamber of the engine, that is the exhaust of the burnt gases resulting from the combustion of the fuel.
• Such a control device generally comprises an actuating member of the valve, movable between two extreme positions corresponding to the open and closed positions of the valve, and an elastic system arranged to oscillate the actuating member. between the two extreme positions.
• This resilient system generally comprises two opposing springs, namely a first spring acting on the actuating member to return it to the end position corresponding to the open position and a second spring acting on the valve to recall that position. ci in the closed position and therefore also the actuating member to the end position corresponding to the closed position.
• the elastic system is in equilibrium when the actuating member is in a substantially median position between its extreme positions.
• the control device further comprises electromagnets associated with a control unit for attracting the actuating member towards one or other of its extreme positions.
• the control unit is programmed to control the electromagnets by implementing a method of servocontrolling the supply current of the electromagnets to a position of the actuating member.
• the operating principle of this control device consists of using the elastic system to move the actuating member towards its extreme positions and each electromagnet to finish the movement of the actuating member towards one of its extreme positions and to maintain the one in this extreme position. Disturbances such as back-pressure, excessive friction, electrical noise, etc. can alter the operation of the control device to the point where the actuating member escapes the force of attraction exerted by one of the electromagnets to pull it into the corresponding extreme position and tend to return to its other extreme position.
• the control unit then energizes the electromagnet to increase the attraction force and force the actuator to return to the end position of the initial destination. Consumption of the electromagnets is particularly high and the catch member of the actuator 1 is not provided so that the valve may be uncontrollable for a time sufficient to alter significantly the proper functioning of the mo- tor.
• An object of the invention is to provide a means for overcoming the aforementioned drawbacks of current systems.
• a device for controlling a valve between an open position and a closed position comprising:
• An actuating member of the valve movable between two extreme positions corresponding to the positions opening and closing of the valve
• control unit for attracting the actuating member towards one or other of its extreme positions, the control unit being arranged for:
• control unit does not systematically try to return the actuating member to its end position of initial destination but can decide, when the energy expenditure which would be necessary is greater than a predetermined threshold, to let go the valve to the other extreme position. It is then possible to return more quickly to a normal cycle by limiting the energy consumption.
• control unit is arranged to feed the electromagnet so as to attract and hold the actuating member in the other extreme position.
• the actuating member is already in position for the rest of the cycle.
• control unit when the amount of energy required for the electromagnet to bring the actuator member In the extreme position corresponding to the open position of the valve is greater than the predetermined threshold, the control unit is arranged to supply one electromagnet so as to bring the actuating member into the corresponding extreme position. at the closed position.
• control unit is arranged to feed one electromagnet so as to amplify the oscillation towards the other extreme position.
• the following oscillation is also amplified towards the end position of initial destination so that the quantity of energy that will be necessary for the electromagnet to bring the body of actuation in its extreme position of initial destination, will be lower than previously required.
• control unit when the amount of energy required for the electromagnet to bring the actuating member into the extreme position corresponding to the closed position is greater than the predetermined threshold, the control unit is arranged to:
• the invention also relates to a method of controlling a valve between an open position and a closed position, comprising the steps of oscillating an actuating member of the valve between two extreme positions corresponding to the positions of opening and closing the valve and controllably bringing the actuating member towards one or other of its extreme positions, the method comprising the steps of: - during oscillation to one of the positions extremes, determine a quantity of energy necessary to bring the actuating member into this extreme position,
• FIG. 1 is a partial diagrammatic view of a heat engine equipped with a valve control device according to the invention
• FIG. 2 is a schematic view illustrating the movement of the actuating member when it is retrofitted; the valve,
• FIG. 3 is a view similar to that of Figure 2 showing a second mode of catching the valve.
• the invention is here described in application to the actuation of a valve 1 of a heat engine with the general reference 2.
• the valve 1 has a tail 3 and is mounted on a cylinder head 4 of the engine 2 to slide between a closed position in which the valve is applied against a seat 5 of the cylinder head 4 and an open position in which the valve is removed from the seat 5 of the cylinder head 4.
• the valve is actuated between these two positions by means of a control device, or actuator generally designated at 6 mounted on the cylinder head 4 of the heat engine 2.
• the actuator comprises a body 7 in which is mounted to slide an actuating member, or movable member, generally designated 8 having a rod 9 having a first end 10 arranged to bear on a free end of the tail 3 of the valve 1 and a second end 11 secured to a pallet 12 received in a housing 13 of the body 7 to slide parallel to the rod 9.
• the body 7 incorporates, in a manner known per se, electromagnetic means for moving the movable member 8.
• the electromagnetic means comprise an electromagnet 14 for holding the vane 12 in a position called the extreme position of closing the valve, and an electromagnet 15 for holding the vane 12 in a position called the extreme open position of the valve, which open on two opposite sides of the housing 13 of the body 7.
• the pallet 12 is here in contact with the electromagnet 14, 15 when it is in the corresponding extreme position.
• the electromagnets 14, 15 are controlled by a control unit 23 implementing a control method from a setpoint current and a moving speed of the movable member 8.
• the moving speed of the movable member 8 is obtained by derivation of a position signal provided by a position sensor 16 of the rod 9.
• the position sensor 16 is for example a Hall effect sensor known per se.
• the actuator also comprises, in a manner known per se, an elastic system for moving the movable member 8.
• the elastic system comprises in a manner known per se a spring 17 interposed between a face 18 of the body 7 and a shoulder 19 of the rod 9 to recall the pallet 12 in the extreme open position and a spring 20 interposed between a face 21 of the yoke 4 and a shoulder 22 of the valve stem 3 to return the valve 1 in the closed position.
• the elastic system thus makes it possible to oscillate the movable member 8 between the extreme open and closed positions and the valve 1 between the open and closed positions.
• the control unit 23 is programmed to determine, at any point of the movement of the movable member 8 towards one of its extreme positions, the energy necessary to feed the corresponding electromagnet 14, 15 so as to bring the movable member 8 in this extreme position. To do this, the control unit 23 has the position of the movable member 8, the speed of moving member 8 and the applied current on which the potential energy, the kinetic energy and the energy depend. magnetic whose movement of the movable member 8 holds. The quantity of energy required is then compared with a predetermined threshold, for example as a function of power consumption requirements or constraints. in order to limit the current flowing in the electromagnets.
• a predetermined threshold for example as a function of power consumption requirements or constraints.
• FIG 2 is shown an attempt to move the movable member 8 to the extreme open position.
• the control unit 23 stops feeding the electromagnet 14, the compressed spring 17 relaxes and pushes the movable member 8 towards the extreme open position and the control unit 23 supplies the electromagnet 15 to attract the movable member 8. If the amount of energy required for the electromagnet 15 to bring the movable member 8 into its extreme open position is at most equal to a threshold, the control unit 23 feeds the electromagnet for bring and maintain the movable member 8 in its extreme open position (movement, shown in dashed lines in Figure 2, corresponding to a normal operating mode).
• control unit 23 leaves the movable member 8 to return to its extreme closed position and feeds the corresponding electromagnet 14 to attract and hold the movable member 8 in the extreme closing position (movement, shown in bold line in Figure 2, corresponding to a degraded mode of operation).
• FIG 3 is shown an attempt to move the movable member 8 to its extreme closed position.
• the control unit 23 stops feeding the electromagnet 15, the spring 20 expands and pushes the movable member 8 towards the extreme closed position and the control unit 23 supplies the electromagnet 15 to attract the organ 8.
• control unit 23 feeds the electromagnet 14 accordingly (movement, shown in dotted line in Figure 3, corresponding to a normal operating mode).
• the control unit 23 allows the moving member 8 to return to the extreme open position and feeds the electromagnet 15 to attract the movable member 8 to its position. extreme opening so as to amplify the oscillation of the movable member 8 to compress the spring 17 so that it exerts a greater force to return the movable member 8 to its extreme closed position when the next oscillation (movement, represented in strong line in Figure 3, corresponding to a degraded mode of operation).
• the attraction force that the electromagnet must provide to attract and hold the movable member 8 in its extreme open position will therefore be lower and will require a quantity of energy below the predetermined threshold.
• the invention is not limited to the embodiment described and variants may be provided without departing from the scope of the invention as defined by the claims.
• the embodiment described is privileged the extreme position of closure, it is possible to favor the extreme position of opening, or to have identical catch-up modes in all cases, or else to choose depending on each situation, the least energy-efficient catch-up mode.
• the actuator may have a different structure from that described and include for example a single electromagnet, an oscillating actuator, ...
• the method of the invention is thus usable with a control device implementing means different from those described for oscillating the member of one actuator or to bring and maintain the actuating member in end positions.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Magnetically Actuated Valves (AREA)
• Valve Device For Special Equipments (AREA)
• Output Control And Ontrol Of Special Type Engine (AREA)
• Electromagnets (AREA)
• Servomotors (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

ID=38042771

Family Applications (1)

Country Status (7)

Families Citing this family (4)

Citations (9)

Family Cites Families (8)

• 2006
  • 2006-10-03 FR FR0608635A patent/FR2906593B1/fr not_active Expired - Fee Related
• 2007
  • 2007-09-28 DE DE602007008116T patent/DE602007008116D1/de active Active
  • 2007-09-28 US US12/443,640 patent/US8038122B2/en not_active Expired - Fee Related
  • 2007-09-28 AT AT07858387T patent/ATE475784T1/de not_active IP Right Cessation
  • 2007-09-28 EP EP07858387A patent/EP2069614B1/fr not_active Not-in-force
  • 2007-09-28 WO PCT/FR2007/001589 patent/WO2008040865A1/fr not_active Ceased
  • 2007-09-28 JP JP2009530908A patent/JP2010506084A/ja active Pending

Patent Citations (9)

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